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edward ngii

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Curtin University

Curtin University

Mahmoud SAYED AHMED

Toronto Metropolitan University

CSIC (Consejo Superior de Investigaciones Científicas-Spanish National Research Council)

Luis Caballero Zoreda

CSIC (Consejo Superior de Investigaciones Científicas-Spanish National Research Council)

National Institute of Construction Management and Research

José Octavio Islas Carmona

Universidad Autónoma del Carmen

Universitas Ciputra

University of East London

Gwen Robbins Schug

University of North Carolina at Greensboro

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Papers by edward ngii

Analisis Spasial Alih Fungsi Kawasan Hutan Terhadap Potensi Peningkatan Debit Banjir Sungai Balandete Dan Sungai Sabilambo

Jurnal Manajemen Rekayasa, Mar 7, 2024

This research was conducted from March to October 2021 with the aim of finding out the extent of ... more This research was conducted from March to October 2021 with the aim of finding out the extent of forest areas that have been converted in the upper reaches of the Sabilambo River and Balandete River and their impact on the potential for increasing flood discharge in these two rivers as well as mitigation alternatives that can be carried out to prevent negative impacts due to function transfer activities. It is hoped that this research can provide information to all parties related to land conversion activities in forest areas. Data requirements include rainfall data, river discharge data, forest area maps and land cover maps produced from analysis of SPOT 6/7 data recorded in 2013 and 2017 sourced from LAPAN made using the maximum livelihood classification method, analyzed using quantitative methods and qualitative. The results of this analysis showed that in 2013 the forest area converted was 7.34% and in 2017 it was 21.66%. Indicated that this function has been transferred is that the highest surface TSS value in Kendari Bay waters is around the Wanggu River, ranging from 760-781 mg/L, while the lowest is at the mouth of the bay, ranging from 672-693 mg/L. Current speed is the water quality parameter that has the greatest influence on the distribution of total suspended solids in Kendari Bay.

Effect of slag nickel (FeNi3) as coarse aggregate on properties of no-fine concrete

IOP Conference Series: Earth and Environmental Science, 2021

One of the industrial wastes of the B3 category is nickel slag. PT. Antam Pomalaa produces nickel... more One of the industrial wastes of the B3 category is nickel slag. PT. Antam Pomalaa produces nickel slag annually of 1 million tons. It has been widely used as an embankment material or reclamation. This waste is hazardous for the environment if not used. An attempt to utilize it is to use it as an aggregate for no-fine concrete. In this research, no-fine concrete is designed by variations of cement ratio to slag. Unit weight and specific gravity test of slag aggregate were performed to calculate the use of nickel slag in a no-fine concrete mixture. The design of no-fine concrete was 1: 2, 1: 4, 1: 6, 1: 8, and 1; 10 by a water-cement ratio of 0.4. The samples of no-fine concrete were made in a 15x15x15 cm cube, with 3 samples of each variation. All the samples were cured for 28 days in the water. Compression tests were performed to analyze the compressive strength of no-fine concrete. The results showed slag nickel (FeNi3) increase unit weight and compressive strength of no-fine concrete. For practical uses no-fine concrete slag (NFC-S) of 1:6 qualifies as a material for city parks, while ratio 1:4 qualifies pavements for pedestrians.

Prediction of SPT Value Based on Cone Penetration Test at Intake Water Project of Wolo River, Southeast Sulawesi

Soil investigation plays an important role in construction design. Adequate information regarding... more Soil investigation plays an important role in construction design. Adequate information regarding soil types and parameters are needed for a safe and economical foundation. However, limited budget often leads to inadequate soil investigations, and as a result, unknown soil parameters are estimated through correlations from the limited investigations that have been carried out. Correlations from SPT and CPT results are often used for design, but their applicability from location to location is questionable. This paper discusses the correlation of N-SPT values to CPT values in Wolo District, Kolaka Regency. The correlation was performed using linear regression analysis to obtain relationships between N-SPT and CPT. The three correlations obtained are N-SPT = 5.64 + 0.012qc, R 2 value of 0.082; N-SPT = 5.93 + 0.01 qc-0.095qf, R 2 value of 0.125; N-SPT = 0.025qc + 0.341qf, R 2 value of 0.455.

Rainfall Infiltration Impact on Road Embankment Stability

Brilliant engineering, Apr 4, 2023

This study evaluates the stability of a widened road embankment slope by considering the effect o... more This study evaluates the stability of a widened road embankment slope by considering the effect of rain infiltration, which is often ignored in practical design. Rainfall infiltrates the soil and alters pore water pressure, reducing its shear strength and potentially causing slope failure. The Phi Index method is used to determine rain infiltration values, using rainfall data from four nearby rain stations over 10 years. The changes in pore water pressure resulting from rain infiltration are incorporated into the slope stability analysis by the limit equilibrium concept using the Spencer method. Back analysis is used to determine the soil shear strength parameters since the CPT test results provide a correlation with values within a certain range. Soil parameters resulting in a safety factor value close to 1.25 (critical condition) were considered representative field conditions. The analysis shows a decrease in the safety factor from 1.50 to 1.31 (12%). These findings emphasize the importance of accounting for rain infiltration in road embankment stability analyses, particularly in areas with high rainfall where the safety factor may fall below the minimum required by Indonesian geotechnical code. When an infiltration effect analysis is not conducted, the safety factor should be increased at least 12% from normal conditions.

Pemberdayaan Masyarakat Nelayan melalui Pembuatan Fish Shelter (Rumah Ikan) Berbasis Beton Non Pasir sebagai Alternatif Daerah Tangkapan Baru di Desa Tanjung Tiram Kecamatan Moramo Utara

Jurnal Pengabdian Multidisiplin

Desa Tanjung Tiram merupakan wilayah pesisir dengan potensi sumberdaya perikanan, khususnya penan... more Desa Tanjung Tiram merupakan wilayah pesisir dengan potensi sumberdaya perikanan, khususnya penangkapan ikan yang cukup besar. Program pengabdian kepada masyarakat terintegrasi Kuliah Kerja Nyata (KKN-Tematik) berlangsung selama 1 bulan (Juli-Agustus 2023). Kegiatan ini bertujuan untuk memberikan pengetahuan dan pemberdayaan masyarakat desa Tanjung Tiram melalui kegiatan pembuatan Fish Shelter (rumah ikan) berbasis beton non pasir, sebagai alternatif tangkapan baru bagi nelayan setempat, sehingga dapat meminimalisir biaya operasional dalam penangkapan ikan. Kegiatan ini juga mendukung kegiatan konservasi dan pemulihan ekosistem terhadap kerusakan lingkungan, karena mengalihkan penangkapan di luar area ekosistem terumbu karang, sehingga stok ikan di ekosistem terumbu karang tetap terjaga. Kegiatan ini melibatkan masyarakat setempat. Metode yang digunakan dalam pembuatan Fish Shelter adalah dengan menyusun beton kotak sebagai rumah ikan. Metode ini memberikan manfaat yang besar dala...

The Effect of Vulcanized Tire Waste on Mechanical Properties of Rubber Concrete as Construction Materials

The growing amount of rubber-shredded waste from tires causes environmental problems. This resear... more The growing amount of rubber-shredded waste from tires causes environmental problems. This research aimed to analyze the application of shredded rubber in the concrete mixtures. Laboratory tests were carried out on 15 cylinders and 15 beams of concrete specimens that contained shredded rubber. Compressive strength, flexural strength, and modulus of elasticity measurements were performed using test specimen containing 400 kg/m 3 of cement and varied volume ratio of shredded rubber to sand which were 0%: 100%; 10%: 90%; 20%: 80%; 30%: 70%; and 40%: 60%. The results show that the mechanical properties of concrete decreased by 50% after the addition of shredded rubber in the mix by 40%. However, the same volumetric ratio of sand and shredded rubber increased the concrete ductility. The use of 20% shredded rubber in the concrete mix can produce light weight concrete for structural construction.

Effect of nickel slag as a sand replacement in strength and workability of concrete

IOP conference series, Oct 1, 2019

Concrete containing cement, sand, gravel, nickel slag, water and superplasticizer were processed ... more Concrete containing cement, sand, gravel, nickel slag, water and superplasticizer were processed using normal intensive mixing. The strength of concrete is determined by the interfacial zone between binder paste and aggregates. Due to the weathering of natural aggregates with time, a morphology with rounded edges is obtained, reducing the interlocking with the paste. Hence, it is interesting to investigate the use of nickel slag as a sand replacement in concrete since this material has sharp angular edges, which can improve the cohesion of the concrete. This research investigates the use of nickel slag as the replacement of sand in concrete. Various concrete samples were produced with the increasing nickel slag content from 0% to 50% every 10%. A water-cement-ratio of 0.35 was chosen in this study. Concrete mixes were assessed for their compressive strength and workability. The obtained results showed that the strength of the concrete increases together with the increasing nickel slag content in the concrete mixture. Also, the results demonstrated that the slump increases with rising nickel content. In addition, there was no bleeding in fresh concrete mixture in this research.

The effect of covid 19 pandemic on the desire of Ramadhan holidays by citizens model

Nucleation and Atmospheric Aerosols, 2023

Optimum combination of ferro-nickel slag (FeNi4) to the normal sand for the concrete compressive strength

IOP Conference Series: Earth and Environmental Science, 2021

Slag nickel is a by-product which causes environmental degradation and conventional slag is widel... more Slag nickel is a by-product which causes environmental degradation and conventional slag is widely used as coarse aggregate in concrete. This research, therefore, used the newest slag type (FeNi4) from PT Antam Pomalaa as fine aggregate in natural sand and determine the effect of the combination on the optimum compressive strength of concrete. Moreover, the results obtained were compared with the use of only natural sand in concrete. The procedure involved varying the percentage of the slag mixed with the natural sand by weight at 0%, 25%, 50%, 75%, and 100% with each sample designed to have minimum compressive strength higher than 20 MPa at 28 days. Furthermore, a compressive strength test was conducted to determine the optimum combination to achieve the best value and the results showed 25% of nickel slag variation to be the best while other variations, 50%, 75%, and 100%, experienced a reduction of 8.96%, 11.85%, and 12.19% respectively in comparison with the normal concrete. Thi...

The Performance of Magnetostrictive Material for Wind-Induced Vibration Power Generator

Applied Mechanics and Materials

This research investigated the effect of span length variation and capless prismatic structure on... more This research investigated the effect of span length variation and capless prismatic structure on the performance of the micropower generator from flow-induced vibration. The vibration response type covers galloping and vortex-induced vibration regimes. The mini harvester energy induced by the harmonic oscillation of prismatic structure was implemented based on the magnetostrictive principle to gain electricity using a galfenol alloy (Fe-Ga). The power generation variations are influenced by the amplitude, frequency, structure displacement, span length, and shape of the bluff body. The optimum power generation is 2.87 mW, and the maximum power generation is 10.63 mW at the resonance velocity Vr of 6.45. Reducing the frequency characteristics of circular cylinders by applying a cap end tip affect power generation characteristics and galloping behaviour for the prism with a span length of 200 mm but not for other span lengths. The effect of span length variation on free vibration and ...

Effects of Dammar as the partial substitution of bitumen in HMA AC-WC containing Buton Asphalt

IOP Conference Series: Earth and Environmental Science

Petroleum asphalt is the residue of fossil fuel distillation. The flexible pavement material gene... more Petroleum asphalt is the residue of fossil fuel distillation. The flexible pavement material generally uses petroleum asphalt. The world’s need for bitumen increases from year to year to pavement materials. Meanwhile, the availability of bitumen as a non-renewable resource is limited. To meet the world’s need for bitumen in the future, the utilization of natural polymers, such as a dammar, can be the best solution. This study aims to analyze the influence of dammar on the Marshall stability of HMA AC-WC containing Buton Granular Asphalt (BGA). This study was carried by using Marshall testing on the Asphalt Concrete Wearing Courses (AC-WC) containing Buton asphalt of 10%. Bitumen content is in all specimens amount 6,3%, bitumen content of BGA 50/30 is 22,48%, and the variation of dammar content is as the substitution of bitumen of 2.5-10%. Before mixing all material, it was first conducted the mixing of dammar and penetration at the temperature of 90°C to get a modified asphalt. The ...

Pemberdayaan Petani Nilam Desa Puasana Kabupaten Konawe Selatan Melalui Intervensi Teknologi Penyulingan Nilam Sederhana

Jurnal Pengabdian Masyarakat Ilmu Terapan (JPMIT)

Desa Puasana adalah salah satu desa di Provinsi Sulawesi Tenggara yang terletak di daerah pesisir... more Desa Puasana adalah salah satu desa di Provinsi Sulawesi Tenggara yang terletak di daerah pesisir pantai. Sebagian besar masyarakat desa membudidayakan tanaman nilam untuk diolah menjadi minyak atsiri yang cukup mahal di pasaran. Permasalahan yang dihadapi oleh petani nilam saat ini yaitu adanya ketergantungan pada pemilik alat penyulingan yang jaraknya hampir 10 km dari lokasi desa, sehingga petani membutuhkan biaya tambahan untuk membawa hasil panen nilam agar di suling menjadi minyak atsiri. Solusi yang dilakukan untuk mengatasi permasalahan tersebut yaitu dengan membuat teknologi penyulingan nilam sederhana serta menyelenggarakan penyuluhan dan pelatihan tentang alat penyulingan sederhana tersebut, sehingga para petani memiliki pengetahuan cara membuat dan mengoperasikan alat penyulingan nilam sederhana secara mandiri. Tujuan program pengabdian ini adalah memberdayakan masyarakat petani nilam desan Puasana dalam memanfaatkan teknologi tepat guna untuk mengurangi ketergantungan p...

Properties of concrete paving blocks made with nickel slags

IOP Conference Series: Earth and Environmental Science, 2021

This study is a follow-up of nickel slag waste used for building construction materials. Paving b... more This study is a follow-up of nickel slag waste used for building construction materials. Paving blocks were made using a mixture of cement and aggregates in a ratio of 1: 3 and 1: 5 which used a mixture of nickel slag waste and natural sand with aggregate gradation in zone III of the rather fine sand category based on SNI 03-2834-2000. Sand substitution with nickel slag waste has used a variation of the composition of the mixture of 0% (without slag), 25%, 75%, and 100% (without sand). The behaviour would be obtained the compressive strength value of paving blocks and average water absorption. Paving blocks compressive strength were tested at the age of 28 days, while the average value of water absorption was performed by immersing the paving block specimens for 24 hours. The physical strength and absorption value of paving block water refer to SNI 03-0691-1996. The results showed that the use of nickel slag waste in making paving blocks could increase the compressive strength of pa...

Human Resources Development Strategy on Sustainable Tourism on Bokori Island

CERN European Organization for Nuclear Research - Zenodo, Apr 1, 2022

Tourism development has significant meaning when viewed from various aspects. From an economic pe... more Tourism development has significant meaning when viewed from various aspects. From an economic perspective, tourism has contributed to the Gross Domestic Product (GDP) in recent years, both through foreign exchange and financial turnover. The tourism sector also opens up business opportunities for tourism services, either directly or indirectly, and opens up many job opportunities. Various countries show that the tourism industry consistently ranks 4th or 5th for foreign exchange-earners for Bungaran et al. (2017). The linkage of tourist attractions, public facilities, tourism facilities, accessibility, and the community has become an imbalance that requires a more professional handling strategy (Yoeti, 2010). Each tourism sector is located in a strategic area or region, namely an area with the primary function of tourism or potential for tourism development. It must be managed by involving more qualified Human Resources (HR), to be able to attract tourists. The object of research is the island of Bokori, Southeast Sulawesi, Indonesia. The purpose of this study is to provide a measurement of how to build the concept of a human resource development strategy on sustainable tourism on Bokori Island and to enrich some theoretical literature, mainly as a basis for identifying human resource development strategies for sustainable tourism on Bokori Island using SWOT analysis. To analyze the weaknesses, strengths, opportunities and threats faced in human resource development strategies for sustainable tourism on Bokori Island. The research uses qualitative methods. Data collection techniques were carried out through library studies and interviews with key informants. The study results show that the SO (Strength Opportunity) strategy includes Cooperation in preparing the Tridharma design of universities in developing sustainable tourism human resources. The ST (Strength Threat) strategy creates sustainable tourism human resource development and more emphasis on the quality of training than the number of participants being trained. WO (Weakness Opportunity) strategy, including curriculum development which is continuously updated. Finally, the WT (Weakness Threat) Strategy includes developing an integrated database with training and mentoring. Recommendations that can be submitted related to the policy strategy are: 1) The need to develop a sustainable tourism HR database; 2) The need to develop a sustainable tourism human resource development program; 3) Develop a roadmap for developing sustainable tourism human resources. It is hoped that after this research is carried out, further research must develop human resource development specifically for tourism managers, both from the private sector and from the Government and raise the variables of competence, work attitude and sense of belonging.

Transfer Pengetahuan Teknologi Pompa Hidram (Non Listrik & BBM) DI Desa Lalouesamba Kabupaten Konawe Selatan

Jurnal Pengabdian NUSANTARA

Lalouesamba Village is one of the youngest villages in the South Konawe Regency, with a non-coast... more Lalouesamba Village is one of the youngest villages in the South Konawe Regency, with a non-coastal slope topography of 82 meters above sea level and an area of about 4.1 km2. The majority are farming/gardening, coolies, and construction workers are the main occupations. Potential water resources include rivers with a width of 3-5 meters around the village. Each 1 artesian spot, boiling water spot, murky water borehole, and 5 units of wells with a depth of 15 meters. The problem with this village partner is that there is still a lack of access to clean water, so the solution offered to lift/pump the potential for river flow is to use a hydraulic ram pump without electricity & fuel. Therefore, this community service activity aims to provide an understanding of hydraulic ram pump knowledge and open insight into the potential for welfare due to the pump. The results of the transfer of knowledge of hydraulic ram pumps show a good indication with the achievement of the main material up t...

Pengaruh Penggunaan Filler Slag Nikel Feni III Pada Campuran Hot Rolled Sheet Wearing Course (HRS-WC)

STABILITA || Jurnal Ilmiah Teknik Sipil, 2020

ABSTRAK Slag nikel adalah limbah B3 yang berasal dari pengolahan biji nikel, proses peleburan bij... more ABSTRAK Slag nikel adalah limbah B3 yang berasal dari pengolahan biji nikel, proses peleburan biji nikel tersebut menghasilkan limbah-limbah yang berupa slag nikel yang jumlahnya sangat besar, sehingga harus ditangani dan dimanfaatkan dengan baik karena berpotensi menimbulkan masalah lingkungan serta fenomena sosial di masyarakat. Penelitian ini mencoba memanfaatkan slag nikel feni III sebagai filler dalam campuran HRS-WC, untuk mengurangi penggunaan agregat alam, sehingga mendapatkan campuran yang lebih ekonomis dan diharapkan dapat menambah kualitas dari lapis perkerasan HRS-WC.Untuk mengetahui kinerja campuran perkerasan HRS-WC dengan menggunakan filler slag nikel feni III dan dibandingkan dengan filler abu batu, serta mengetahui kadar aspal optimum pada penggunaan filler slag nikel feni III. Penelitian ini menggunakan 4 variasi kadar filler slag nikel feni III yaitu 0%, 6,7%, 9%, dan 11,2% dengan menggunakan 5 variasi kadar aspal dengan benda uji masing masing variasi 2 buah.Kar...

POTENSI SLAG NIKEL HALUS (FeNi 4) PT. ANTAM POMALAA SEBAGAI AGREGAT HALUS PADA CAMPURAN ASPAL

STABILITA || Jurnal Ilmiah Teknik Sipil, 2020

ABSTRAKSlag nikel (FeNi4) adalah jenis terbaru dengan ukuran butiran mendekati pasir (lolos No. 8... more ABSTRAKSlag nikel (FeNi4) adalah jenis terbaru dengan ukuran butiran mendekati pasir (lolos No. 8). Jumlah buangan slag nikel telah mencapai 1 juta ton pada tahun 2018, sehingga berbahaya bagi lingkungan jika tidak dimanfaatkan secara luas. Disisi lain kebutuhan agregat halus campuran aspal jenis Hot Rolled Sheet (HRS-WC) sangat tinggi. Penelitian ini bertujuan untuk mengetahui potensi pemanfaatan slag nikel FeNi4 sebagai agregat pada campuran aspal jenis HRS.Slag nikel (FeNi4) diperoleh dari PT. Antam Pomalaa. Penelitian dirancang dengan tiga variasi penggunaan slag terhadap agregat halus standar yaitu Variasi 1 (0/100%); Variasi 2 (50/50%); dan Variasi 3 (100/0%). Penyetaraan berat jenis dilakukan untuk menghitung jumlah slag yang digunakan. Jumlah sampel sebanyak 45 sampel dan diuji menggunakan alat Marshall Test. Spesifikasi yang digunakan dalam penelitian mengacu pada Bina Marga 2010.Hasil penelitian menunjukkan bahwa pada benda uji Variasi 2 (50/50%) masih diperoleh kadar aspa...

Evaluasi Kemampuan Struktur Gedung Kantor Dinas Kesehatan

STABILITA || Jurnal Ilmiah Teknik Sipil, Jan 23, 2022

Kekuatan Gedung Kantor Dinas Kesehatan Provinsi Sulawesi Tenggara memiliki dimensi eksisting gedu... more Kekuatan Gedung Kantor Dinas Kesehatan Provinsi Sulawesi Tenggara memiliki dimensi eksisting gedung 2 lantai akan di kembangkan sesuai kebutuhan yakni dengan menambah jumlah lantai menjadi 4 lantai, kajian ini menjelaskan pengaruh kekuatan akibat beban gempa terhadap struktur gedung tersebut dengan bantuan analisis menggunakan SAP 2000 v.12 sehingga dapat di desain kembali dimensi pada tulangan struktur pelat, balok dan kolom pada lantai 3 dan lantai 4, dari analisis yang dilakukan menunjukkan bahwa struktur exsisting bangunan yang terdiri dari kolom dan balok induk lantai 1 dan lantai 2 masih mampu menahan beban tambahan akibat penambahan jumlah lantai.

The Ability of Green Open Spaces in Greenhouse Gas Control to Achieve Green Cities in Kendari City

International Journal of Energy Economics and Policy, 2022

The urban challenge in realizing a green city for the purpose of a sustainable city is air pollut... more The urban challenge in realizing a green city for the purpose of a sustainable city is air pollution resulting from vehicle emissions (Carbon monoxide/ CO2). Reducing vehicle emissions can be done by providing green open spaces. In Kendari City, a potential area for the development of green open space is the Bahteramas General Hospital. Activities in the area and around the Bahteramas General Hospital in Kendari City are quite high so that they contribute to emissions (CO2). The object of research analysis is the number of vehicles (daily traffic), the capacity of electricity use, the area of the Bahteramas General Hospital and the area of the existing green open space. The results showed that the type of vehicle that contributes high to CO2 is a motorcycle. The use of fuel as a source of emission (CO2) which contributes to premium types of greenhouse gases, diesel and the use of electrical energy. The absorption capacity of the existing green open space has not been able to reduce ...

Enhancing Dynamic Response of Cantilevered Rectangular Prism Using a Splitter Plate as a Passive Turbulence Control in Water Tunnel

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 2022

The effects of splitter plate as a passive turbulence control on the transverse vibration charact... more The effects of splitter plate as a passive turbulence control on the transverse vibration characteristics of a cantilevered rectangular prism with the different finite length (aspect ratio L/H) and depth ratios (side ratio D/H of 0.2 and 0.5) was investigated in a water tunnel. A splitter plate was installed behind the prism with a small gap and sufficient length to prevent vortex shedding intrusion. It enhances the response amplitude ascended linearly with respect to non-dimensional velocity. In the case of the prisms with critical points, interferences of amplitude signal spectra for the period of displacement vanished, yielding a uniform waveform on the response amplitude. Inserting a splitter plate improves the increment rate of the dynamic response of the test models. A brief numerical calculation was performed to find the quantities of flow features around a plain and rectangular prism with a detached splitter plate. The alteration of flow wake characteristics is found by dimi...

Analisis Spasial Alih Fungsi Kawasan Hutan Terhadap Potensi Peningkatan Debit Banjir Sungai Balandete Dan Sungai Sabilambo

Jurnal Manajemen Rekayasa, Mar 7, 2024

This research was conducted from March to October 2021 with the aim of finding out the extent of ... more This research was conducted from March to October 2021 with the aim of finding out the extent of forest areas that have been converted in the upper reaches of the Sabilambo River and Balandete River and their impact on the potential for increasing flood discharge in these two rivers as well as mitigation alternatives that can be carried out to prevent negative impacts due to function transfer activities. It is hoped that this research can provide information to all parties related to land conversion activities in forest areas. Data requirements include rainfall data, river discharge data, forest area maps and land cover maps produced from analysis of SPOT 6/7 data recorded in 2013 and 2017 sourced from LAPAN made using the maximum livelihood classification method, analyzed using quantitative methods and qualitative. The results of this analysis showed that in 2013 the forest area converted was 7.34% and in 2017 it was 21.66%. Indicated that this function has been transferred is that the highest surface TSS value in Kendari Bay waters is around the Wanggu River, ranging from 760-781 mg/L, while the lowest is at the mouth of the bay, ranging from 672-693 mg/L. Current speed is the water quality parameter that has the greatest influence on the distribution of total suspended solids in Kendari Bay.

Effect of slag nickel (FeNi3) as coarse aggregate on properties of no-fine concrete

IOP Conference Series: Earth and Environmental Science, 2021

One of the industrial wastes of the B3 category is nickel slag. PT. Antam Pomalaa produces nickel... more One of the industrial wastes of the B3 category is nickel slag. PT. Antam Pomalaa produces nickel slag annually of 1 million tons. It has been widely used as an embankment material or reclamation. This waste is hazardous for the environment if not used. An attempt to utilize it is to use it as an aggregate for no-fine concrete. In this research, no-fine concrete is designed by variations of cement ratio to slag. Unit weight and specific gravity test of slag aggregate were performed to calculate the use of nickel slag in a no-fine concrete mixture. The design of no-fine concrete was 1: 2, 1: 4, 1: 6, 1: 8, and 1; 10 by a water-cement ratio of 0.4. The samples of no-fine concrete were made in a 15x15x15 cm cube, with 3 samples of each variation. All the samples were cured for 28 days in the water. Compression tests were performed to analyze the compressive strength of no-fine concrete. The results showed slag nickel (FeNi3) increase unit weight and compressive strength of no-fine concrete. For practical uses no-fine concrete slag (NFC-S) of 1:6 qualifies as a material for city parks, while ratio 1:4 qualifies pavements for pedestrians.

Prediction of SPT Value Based on Cone Penetration Test at Intake Water Project of Wolo River, Southeast Sulawesi

Soil investigation plays an important role in construction design. Adequate information regarding... more Soil investigation plays an important role in construction design. Adequate information regarding soil types and parameters are needed for a safe and economical foundation. However, limited budget often leads to inadequate soil investigations, and as a result, unknown soil parameters are estimated through correlations from the limited investigations that have been carried out. Correlations from SPT and CPT results are often used for design, but their applicability from location to location is questionable. This paper discusses the correlation of N-SPT values to CPT values in Wolo District, Kolaka Regency. The correlation was performed using linear regression analysis to obtain relationships between N-SPT and CPT. The three correlations obtained are N-SPT = 5.64 + 0.012qc, R 2 value of 0.082; N-SPT = 5.93 + 0.01 qc-0.095qf, R 2 value of 0.125; N-SPT = 0.025qc + 0.341qf, R 2 value of 0.455.

Rainfall Infiltration Impact on Road Embankment Stability

Brilliant engineering, Apr 4, 2023

This study evaluates the stability of a widened road embankment slope by considering the effect o... more This study evaluates the stability of a widened road embankment slope by considering the effect of rain infiltration, which is often ignored in practical design. Rainfall infiltrates the soil and alters pore water pressure, reducing its shear strength and potentially causing slope failure. The Phi Index method is used to determine rain infiltration values, using rainfall data from four nearby rain stations over 10 years. The changes in pore water pressure resulting from rain infiltration are incorporated into the slope stability analysis by the limit equilibrium concept using the Spencer method. Back analysis is used to determine the soil shear strength parameters since the CPT test results provide a correlation with values within a certain range. Soil parameters resulting in a safety factor value close to 1.25 (critical condition) were considered representative field conditions. The analysis shows a decrease in the safety factor from 1.50 to 1.31 (12%). These findings emphasize the importance of accounting for rain infiltration in road embankment stability analyses, particularly in areas with high rainfall where the safety factor may fall below the minimum required by Indonesian geotechnical code. When an infiltration effect analysis is not conducted, the safety factor should be increased at least 12% from normal conditions.

Pemberdayaan Masyarakat Nelayan melalui Pembuatan Fish Shelter (Rumah Ikan) Berbasis Beton Non Pasir sebagai Alternatif Daerah Tangkapan Baru di Desa Tanjung Tiram Kecamatan Moramo Utara

Jurnal Pengabdian Multidisiplin

Desa Tanjung Tiram merupakan wilayah pesisir dengan potensi sumberdaya perikanan, khususnya penan... more Desa Tanjung Tiram merupakan wilayah pesisir dengan potensi sumberdaya perikanan, khususnya penangkapan ikan yang cukup besar. Program pengabdian kepada masyarakat terintegrasi Kuliah Kerja Nyata (KKN-Tematik) berlangsung selama 1 bulan (Juli-Agustus 2023). Kegiatan ini bertujuan untuk memberikan pengetahuan dan pemberdayaan masyarakat desa Tanjung Tiram melalui kegiatan pembuatan Fish Shelter (rumah ikan) berbasis beton non pasir, sebagai alternatif tangkapan baru bagi nelayan setempat, sehingga dapat meminimalisir biaya operasional dalam penangkapan ikan. Kegiatan ini juga mendukung kegiatan konservasi dan pemulihan ekosistem terhadap kerusakan lingkungan, karena mengalihkan penangkapan di luar area ekosistem terumbu karang, sehingga stok ikan di ekosistem terumbu karang tetap terjaga. Kegiatan ini melibatkan masyarakat setempat. Metode yang digunakan dalam pembuatan Fish Shelter adalah dengan menyusun beton kotak sebagai rumah ikan. Metode ini memberikan manfaat yang besar dala...

The Effect of Vulcanized Tire Waste on Mechanical Properties of Rubber Concrete as Construction Materials

The growing amount of rubber-shredded waste from tires causes environmental problems. This resear... more The growing amount of rubber-shredded waste from tires causes environmental problems. This research aimed to analyze the application of shredded rubber in the concrete mixtures. Laboratory tests were carried out on 15 cylinders and 15 beams of concrete specimens that contained shredded rubber. Compressive strength, flexural strength, and modulus of elasticity measurements were performed using test specimen containing 400 kg/m 3 of cement and varied volume ratio of shredded rubber to sand which were 0%: 100%; 10%: 90%; 20%: 80%; 30%: 70%; and 40%: 60%. The results show that the mechanical properties of concrete decreased by 50% after the addition of shredded rubber in the mix by 40%. However, the same volumetric ratio of sand and shredded rubber increased the concrete ductility. The use of 20% shredded rubber in the concrete mix can produce light weight concrete for structural construction.

Effect of nickel slag as a sand replacement in strength and workability of concrete

IOP conference series, Oct 1, 2019

Concrete containing cement, sand, gravel, nickel slag, water and superplasticizer were processed ... more Concrete containing cement, sand, gravel, nickel slag, water and superplasticizer were processed using normal intensive mixing. The strength of concrete is determined by the interfacial zone between binder paste and aggregates. Due to the weathering of natural aggregates with time, a morphology with rounded edges is obtained, reducing the interlocking with the paste. Hence, it is interesting to investigate the use of nickel slag as a sand replacement in concrete since this material has sharp angular edges, which can improve the cohesion of the concrete. This research investigates the use of nickel slag as the replacement of sand in concrete. Various concrete samples were produced with the increasing nickel slag content from 0% to 50% every 10%. A water-cement-ratio of 0.35 was chosen in this study. Concrete mixes were assessed for their compressive strength and workability. The obtained results showed that the strength of the concrete increases together with the increasing nickel slag content in the concrete mixture. Also, the results demonstrated that the slump increases with rising nickel content. In addition, there was no bleeding in fresh concrete mixture in this research.

The effect of covid 19 pandemic on the desire of Ramadhan holidays by citizens model

Nucleation and Atmospheric Aerosols, 2023

Optimum combination of ferro-nickel slag (FeNi4) to the normal sand for the concrete compressive strength

IOP Conference Series: Earth and Environmental Science, 2021

Slag nickel is a by-product which causes environmental degradation and conventional slag is widel... more Slag nickel is a by-product which causes environmental degradation and conventional slag is widely used as coarse aggregate in concrete. This research, therefore, used the newest slag type (FeNi4) from PT Antam Pomalaa as fine aggregate in natural sand and determine the effect of the combination on the optimum compressive strength of concrete. Moreover, the results obtained were compared with the use of only natural sand in concrete. The procedure involved varying the percentage of the slag mixed with the natural sand by weight at 0%, 25%, 50%, 75%, and 100% with each sample designed to have minimum compressive strength higher than 20 MPa at 28 days. Furthermore, a compressive strength test was conducted to determine the optimum combination to achieve the best value and the results showed 25% of nickel slag variation to be the best while other variations, 50%, 75%, and 100%, experienced a reduction of 8.96%, 11.85%, and 12.19% respectively in comparison with the normal concrete. Thi...

The Performance of Magnetostrictive Material for Wind-Induced Vibration Power Generator

Applied Mechanics and Materials

This research investigated the effect of span length variation and capless prismatic structure on... more This research investigated the effect of span length variation and capless prismatic structure on the performance of the micropower generator from flow-induced vibration. The vibration response type covers galloping and vortex-induced vibration regimes. The mini harvester energy induced by the harmonic oscillation of prismatic structure was implemented based on the magnetostrictive principle to gain electricity using a galfenol alloy (Fe-Ga). The power generation variations are influenced by the amplitude, frequency, structure displacement, span length, and shape of the bluff body. The optimum power generation is 2.87 mW, and the maximum power generation is 10.63 mW at the resonance velocity Vr of 6.45. Reducing the frequency characteristics of circular cylinders by applying a cap end tip affect power generation characteristics and galloping behaviour for the prism with a span length of 200 mm but not for other span lengths. The effect of span length variation on free vibration and ...

Effects of Dammar as the partial substitution of bitumen in HMA AC-WC containing Buton Asphalt

IOP Conference Series: Earth and Environmental Science

Petroleum asphalt is the residue of fossil fuel distillation. The flexible pavement material gene... more Petroleum asphalt is the residue of fossil fuel distillation. The flexible pavement material generally uses petroleum asphalt. The world’s need for bitumen increases from year to year to pavement materials. Meanwhile, the availability of bitumen as a non-renewable resource is limited. To meet the world’s need for bitumen in the future, the utilization of natural polymers, such as a dammar, can be the best solution. This study aims to analyze the influence of dammar on the Marshall stability of HMA AC-WC containing Buton Granular Asphalt (BGA). This study was carried by using Marshall testing on the Asphalt Concrete Wearing Courses (AC-WC) containing Buton asphalt of 10%. Bitumen content is in all specimens amount 6,3%, bitumen content of BGA 50/30 is 22,48%, and the variation of dammar content is as the substitution of bitumen of 2.5-10%. Before mixing all material, it was first conducted the mixing of dammar and penetration at the temperature of 90°C to get a modified asphalt. The ...

Pemberdayaan Petani Nilam Desa Puasana Kabupaten Konawe Selatan Melalui Intervensi Teknologi Penyulingan Nilam Sederhana

Jurnal Pengabdian Masyarakat Ilmu Terapan (JPMIT)

Desa Puasana adalah salah satu desa di Provinsi Sulawesi Tenggara yang terletak di daerah pesisir... more Desa Puasana adalah salah satu desa di Provinsi Sulawesi Tenggara yang terletak di daerah pesisir pantai. Sebagian besar masyarakat desa membudidayakan tanaman nilam untuk diolah menjadi minyak atsiri yang cukup mahal di pasaran. Permasalahan yang dihadapi oleh petani nilam saat ini yaitu adanya ketergantungan pada pemilik alat penyulingan yang jaraknya hampir 10 km dari lokasi desa, sehingga petani membutuhkan biaya tambahan untuk membawa hasil panen nilam agar di suling menjadi minyak atsiri. Solusi yang dilakukan untuk mengatasi permasalahan tersebut yaitu dengan membuat teknologi penyulingan nilam sederhana serta menyelenggarakan penyuluhan dan pelatihan tentang alat penyulingan sederhana tersebut, sehingga para petani memiliki pengetahuan cara membuat dan mengoperasikan alat penyulingan nilam sederhana secara mandiri. Tujuan program pengabdian ini adalah memberdayakan masyarakat petani nilam desan Puasana dalam memanfaatkan teknologi tepat guna untuk mengurangi ketergantungan p...

Properties of concrete paving blocks made with nickel slags

IOP Conference Series: Earth and Environmental Science, 2021

This study is a follow-up of nickel slag waste used for building construction materials. Paving b... more This study is a follow-up of nickel slag waste used for building construction materials. Paving blocks were made using a mixture of cement and aggregates in a ratio of 1: 3 and 1: 5 which used a mixture of nickel slag waste and natural sand with aggregate gradation in zone III of the rather fine sand category based on SNI 03-2834-2000. Sand substitution with nickel slag waste has used a variation of the composition of the mixture of 0% (without slag), 25%, 75%, and 100% (without sand). The behaviour would be obtained the compressive strength value of paving blocks and average water absorption. Paving blocks compressive strength were tested at the age of 28 days, while the average value of water absorption was performed by immersing the paving block specimens for 24 hours. The physical strength and absorption value of paving block water refer to SNI 03-0691-1996. The results showed that the use of nickel slag waste in making paving blocks could increase the compressive strength of pa...

Human Resources Development Strategy on Sustainable Tourism on Bokori Island

CERN European Organization for Nuclear Research - Zenodo, Apr 1, 2022

Tourism development has significant meaning when viewed from various aspects. From an economic pe... more Tourism development has significant meaning when viewed from various aspects. From an economic perspective, tourism has contributed to the Gross Domestic Product (GDP) in recent years, both through foreign exchange and financial turnover. The tourism sector also opens up business opportunities for tourism services, either directly or indirectly, and opens up many job opportunities. Various countries show that the tourism industry consistently ranks 4th or 5th for foreign exchange-earners for Bungaran et al. (2017). The linkage of tourist attractions, public facilities, tourism facilities, accessibility, and the community has become an imbalance that requires a more professional handling strategy (Yoeti, 2010). Each tourism sector is located in a strategic area or region, namely an area with the primary function of tourism or potential for tourism development. It must be managed by involving more qualified Human Resources (HR), to be able to attract tourists. The object of research is the island of Bokori, Southeast Sulawesi, Indonesia. The purpose of this study is to provide a measurement of how to build the concept of a human resource development strategy on sustainable tourism on Bokori Island and to enrich some theoretical literature, mainly as a basis for identifying human resource development strategies for sustainable tourism on Bokori Island using SWOT analysis. To analyze the weaknesses, strengths, opportunities and threats faced in human resource development strategies for sustainable tourism on Bokori Island. The research uses qualitative methods. Data collection techniques were carried out through library studies and interviews with key informants. The study results show that the SO (Strength Opportunity) strategy includes Cooperation in preparing the Tridharma design of universities in developing sustainable tourism human resources. The ST (Strength Threat) strategy creates sustainable tourism human resource development and more emphasis on the quality of training than the number of participants being trained. WO (Weakness Opportunity) strategy, including curriculum development which is continuously updated. Finally, the WT (Weakness Threat) Strategy includes developing an integrated database with training and mentoring. Recommendations that can be submitted related to the policy strategy are: 1) The need to develop a sustainable tourism HR database; 2) The need to develop a sustainable tourism human resource development program; 3) Develop a roadmap for developing sustainable tourism human resources. It is hoped that after this research is carried out, further research must develop human resource development specifically for tourism managers, both from the private sector and from the Government and raise the variables of competence, work attitude and sense of belonging.

Transfer Pengetahuan Teknologi Pompa Hidram (Non Listrik & BBM) DI Desa Lalouesamba Kabupaten Konawe Selatan

Jurnal Pengabdian NUSANTARA

Lalouesamba Village is one of the youngest villages in the South Konawe Regency, with a non-coast... more Lalouesamba Village is one of the youngest villages in the South Konawe Regency, with a non-coastal slope topography of 82 meters above sea level and an area of about 4.1 km2. The majority are farming/gardening, coolies, and construction workers are the main occupations. Potential water resources include rivers with a width of 3-5 meters around the village. Each 1 artesian spot, boiling water spot, murky water borehole, and 5 units of wells with a depth of 15 meters. The problem with this village partner is that there is still a lack of access to clean water, so the solution offered to lift/pump the potential for river flow is to use a hydraulic ram pump without electricity & fuel. Therefore, this community service activity aims to provide an understanding of hydraulic ram pump knowledge and open insight into the potential for welfare due to the pump. The results of the transfer of knowledge of hydraulic ram pumps show a good indication with the achievement of the main material up t...

Pengaruh Penggunaan Filler Slag Nikel Feni III Pada Campuran Hot Rolled Sheet Wearing Course (HRS-WC)

STABILITA || Jurnal Ilmiah Teknik Sipil, 2020

ABSTRAK Slag nikel adalah limbah B3 yang berasal dari pengolahan biji nikel, proses peleburan bij... more ABSTRAK Slag nikel adalah limbah B3 yang berasal dari pengolahan biji nikel, proses peleburan biji nikel tersebut menghasilkan limbah-limbah yang berupa slag nikel yang jumlahnya sangat besar, sehingga harus ditangani dan dimanfaatkan dengan baik karena berpotensi menimbulkan masalah lingkungan serta fenomena sosial di masyarakat. Penelitian ini mencoba memanfaatkan slag nikel feni III sebagai filler dalam campuran HRS-WC, untuk mengurangi penggunaan agregat alam, sehingga mendapatkan campuran yang lebih ekonomis dan diharapkan dapat menambah kualitas dari lapis perkerasan HRS-WC.Untuk mengetahui kinerja campuran perkerasan HRS-WC dengan menggunakan filler slag nikel feni III dan dibandingkan dengan filler abu batu, serta mengetahui kadar aspal optimum pada penggunaan filler slag nikel feni III. Penelitian ini menggunakan 4 variasi kadar filler slag nikel feni III yaitu 0%, 6,7%, 9%, dan 11,2% dengan menggunakan 5 variasi kadar aspal dengan benda uji masing masing variasi 2 buah.Kar...

POTENSI SLAG NIKEL HALUS (FeNi 4) PT. ANTAM POMALAA SEBAGAI AGREGAT HALUS PADA CAMPURAN ASPAL

STABILITA || Jurnal Ilmiah Teknik Sipil, 2020

ABSTRAKSlag nikel (FeNi4) adalah jenis terbaru dengan ukuran butiran mendekati pasir (lolos No. 8... more ABSTRAKSlag nikel (FeNi4) adalah jenis terbaru dengan ukuran butiran mendekati pasir (lolos No. 8). Jumlah buangan slag nikel telah mencapai 1 juta ton pada tahun 2018, sehingga berbahaya bagi lingkungan jika tidak dimanfaatkan secara luas. Disisi lain kebutuhan agregat halus campuran aspal jenis Hot Rolled Sheet (HRS-WC) sangat tinggi. Penelitian ini bertujuan untuk mengetahui potensi pemanfaatan slag nikel FeNi4 sebagai agregat pada campuran aspal jenis HRS.Slag nikel (FeNi4) diperoleh dari PT. Antam Pomalaa. Penelitian dirancang dengan tiga variasi penggunaan slag terhadap agregat halus standar yaitu Variasi 1 (0/100%); Variasi 2 (50/50%); dan Variasi 3 (100/0%). Penyetaraan berat jenis dilakukan untuk menghitung jumlah slag yang digunakan. Jumlah sampel sebanyak 45 sampel dan diuji menggunakan alat Marshall Test. Spesifikasi yang digunakan dalam penelitian mengacu pada Bina Marga 2010.Hasil penelitian menunjukkan bahwa pada benda uji Variasi 2 (50/50%) masih diperoleh kadar aspa...

Evaluasi Kemampuan Struktur Gedung Kantor Dinas Kesehatan

STABILITA || Jurnal Ilmiah Teknik Sipil, Jan 23, 2022

Kekuatan Gedung Kantor Dinas Kesehatan Provinsi Sulawesi Tenggara memiliki dimensi eksisting gedu... more Kekuatan Gedung Kantor Dinas Kesehatan Provinsi Sulawesi Tenggara memiliki dimensi eksisting gedung 2 lantai akan di kembangkan sesuai kebutuhan yakni dengan menambah jumlah lantai menjadi 4 lantai, kajian ini menjelaskan pengaruh kekuatan akibat beban gempa terhadap struktur gedung tersebut dengan bantuan analisis menggunakan SAP 2000 v.12 sehingga dapat di desain kembali dimensi pada tulangan struktur pelat, balok dan kolom pada lantai 3 dan lantai 4, dari analisis yang dilakukan menunjukkan bahwa struktur exsisting bangunan yang terdiri dari kolom dan balok induk lantai 1 dan lantai 2 masih mampu menahan beban tambahan akibat penambahan jumlah lantai.

The Ability of Green Open Spaces in Greenhouse Gas Control to Achieve Green Cities in Kendari City

International Journal of Energy Economics and Policy, 2022

The urban challenge in realizing a green city for the purpose of a sustainable city is air pollut... more The urban challenge in realizing a green city for the purpose of a sustainable city is air pollution resulting from vehicle emissions (Carbon monoxide/ CO2). Reducing vehicle emissions can be done by providing green open spaces. In Kendari City, a potential area for the development of green open space is the Bahteramas General Hospital. Activities in the area and around the Bahteramas General Hospital in Kendari City are quite high so that they contribute to emissions (CO2). The object of research analysis is the number of vehicles (daily traffic), the capacity of electricity use, the area of the Bahteramas General Hospital and the area of the existing green open space. The results showed that the type of vehicle that contributes high to CO2 is a motorcycle. The use of fuel as a source of emission (CO2) which contributes to premium types of greenhouse gases, diesel and the use of electrical energy. The absorption capacity of the existing green open space has not been able to reduce ...

Enhancing Dynamic Response of Cantilevered Rectangular Prism Using a Splitter Plate as a Passive Turbulence Control in Water Tunnel

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 2022

The effects of splitter plate as a passive turbulence control on the transverse vibration charact... more The effects of splitter plate as a passive turbulence control on the transverse vibration characteristics of a cantilevered rectangular prism with the different finite length (aspect ratio L/H) and depth ratios (side ratio D/H of 0.2 and 0.5) was investigated in a water tunnel. A splitter plate was installed behind the prism with a small gap and sufficient length to prevent vortex shedding intrusion. It enhances the response amplitude ascended linearly with respect to non-dimensional velocity. In the case of the prisms with critical points, interferences of amplitude signal spectra for the period of displacement vanished, yielding a uniform waveform on the response amplitude. Inserting a splitter plate improves the increment rate of the dynamic response of the test models. A brief numerical calculation was performed to find the quantities of flow features around a plain and rectangular prism with a detached splitter plate. The alteration of flow wake characteristics is found by dimi...