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Ali Akbar Daya

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Ali Akbar Daya is a PhD at the University of Sistan andBaluchestan University, Zahedan. He holds a Bachelor of Science from Yazd University and Master of Science from Tehran University both in Mining Engineering. He has been involved in a variety of engineering and feasibility studies.

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Sistan and Baluchestan

Debashish Chakravarty

INSEAD

Maria Paula Mendes

Instituto Superior Técnico

Gabriele Buttafuoco

Consiglio Nazionale delle Ricerche (CNR)

Tbilisi State University

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Papers by Ali Akbar Daya

Nonlinear disjunctive kriging for the estimating and modeling of a vein copper deposit

Iranian Journal of Earth Sciences, Jul 1, 2019

Estimation of mineral resources and reserves with low values of error is essential in mineral exp... more Estimation of mineral resources and reserves with low values of error is essential in mineral exploration. The aim of this study is to estimate and model a vein type deposit using disjunctive kriging method. Disjunctive Kriging (DK) as an appropriate nonlinear estimation method has been used for estimation of Cu values. For estimation of Cu values and modeling of the distribution of Cu in Chelkureh, samples have been taken from 48 drill holes in Chelkureh, and the values of Cu have been analyzed. Resulting data from analyzing Cu values were converted to standard normal values using Hermite polynomials. Variography has been done in the Chelkureh deposit. After studying variograms in different directions, it was found out that the ore deposit has a mild anisotropy. The best-fitted variogram model was considered for disjunctive kriging estimation. The model consists of a pure nugget effect with 0.46 amplitude plus a spherical scheme with sill 1.20 and range 140 m. Consequently, a three-dimensional model of estimated value and error estimated value was provided by disjunctive kriging to divide the ore into an economic and uneconomic part. The models based on the estimate of the DK method in the study area exhibited an increasing trend of concentration from the center to North. Finally, validation between the disjunctive kriging carried out by using cross-validation. The result showed that the correlation of estimated values and real values was strong (63.4%).

Selection of chromite processing plant site using fuzzy analytic hierarchy process (FAHP)

Journal of Mining and Environment, 2017

Based on existence of the chromite deposits in the Sistan and Baluchestan province in Iran, and a... more Based on existence of the chromite deposits in the Sistan and Baluchestan province in Iran, and also various applications of chromite in different industries, it is expected that the establishment of chromite processing plant is required in the erelong. The geographical location of a processing plant can have a strong influence on the success of an industrial venture. The processing plant site selection is a multi-criteria decision problem. The conventional methods used for a plant location selection are inadequate for dealing with the imprecise or vague nature of a linguistic assessment. To overcome this difficulty, the fuzzy multi-criteria decision-making methods are proposed. This paper presents an application of the analytic hierarchy process (AHP) method based on the fuzzy sets (Fuzzy AHP) used to select an appropriate site for a chromite processing plant in the Sistan and Baluchestan province. For this purpose, based on the concentration of chromite deposits in different regio...

Choghart kuzey demir cevheri yatağı anomalisi için ayırıcı kriging yöntemiyle jeoistatistiksel tenör modellemesi

This paper is devoted to the application of the disjunctive kriging method in the Choghart north ... more This paper is devoted to the application of the disjunctive kriging method in the Choghart north anomaly iron ore deposit in Yazd province, Iran. The local distributions of the values of a regionalized attribute at unsampled locations can be assessed by disjunctive kriging. The case study consists of borehole samples measuring the iron concentration. A Gaussian isofactorial model is fitted to these data and disjunctive kriging was used to assess the local probabilities that the actual concentrations exceed a threshold value and to divide the ore into an economic and uneconomic parts. The tools and concepts are complemented by a set of computer programs and applied to the case study. The study showed that disjunctive kriging can be applied successfully for modeling the grade of an ore deposit.

[Effects of expression silencing of MAGE3 by RNA interference on location and metastasis of lung carcinoma cells]

Zhonghua yi xue za zhi, 2006

OBJECTIVE To construct small interfering RNA (siRNA) expression vectors targeting human MAGE3 gen... more OBJECTIVE To construct small interfering RNA (siRNA) expression vectors targeting human MAGE3 gene and to observe the effects of gene silencing of MAGE3 by RNA interference on location and metastasis of lung carcinoma cells. METHODS MAGE3 mRNA targeted hairpin siRNA was devised and the oligonucleotide strands of DNA fragments encoding the above siRNA were synthesized. After annealing of the complementary strands, the DNA fragments were cloned into pSUPERneoGFP, followed by amplification and DNA sequencing, then transfected into human lung carcinoma NCI-H446. The expression of MAGE3 gene mRNA and protein were examined by RT-PCR and Western blotting. Colony formation assay and Boyden chamber assay were performed to detect the effects of MAGE3 on colony formation and metastasis. RESULTS The DNA fragments encoding MAGE3-targeted siRNA were cloned into the pSUPERneoGFP and confirmed by restrictive enzyme digestion and DNA sequencing. RT-PCR and Western blotting revealed a strongly decrea...

A Comparative Analysis Between Disjunctive Kriging and Ordinary Kriging for Estimating the Reserve of a Mine; a Case Study of Choghart Iron Ore Deposit

From a geostatistical viewpoint, non-linear interpolation is an attempt to estimate the condition... more From a geostatistical viewpoint, non-linear interpolation is an attempt to estimate the conditional expectation, and further the conditional distribution of grade at a location, as opposed to simply predicting the grade itself. There are many non-linear methods now available. Disjunctive Kriging is one of them. This paper presents a comparison of ordinary kriging and disjunctive kriging in Choghart iron ore deposit in Yazd province, Iran. The case study consists of borehole samples measuring the Fe concentration. The sample data used in this study consist of exploration drilling data, suitably composited. The data set is irregularly spaced and has an almost normal distribution. Fe grade was selected as the major regional variable on which the present research has focused. To carry out ordinary kriging and disjunctive kriging, spherical model was fitted over empirical variogram. To estimate the Iron grade, ordinary kriging and disjunctive kriging methods were used. All of the exploit...

$Research paper thumbnail of Comparative analysis between concentration- number (C-N) and concentration- area (C-A) fractal models for separating anomaly from background in Siahrood 100,000 sheet, NW Iran$

Comparative analysis between concentration- number (C-N) and concentration- area (C-A) fractal models for separating anomaly from background in Siahrood 100,000 sheet, NW Iran

Journal of Aalytical and Numerical Methods in Mining Engineering, Feb 1, 2018

$Research paper thumbnail of Application and comparison of the cokriging and the fractal model for identifying geochemical anomalies in Janja area, SE Iran$

Application and comparison of the cokriging and the fractal model for identifying geochemical anomalies in Janja area, SE Iran

International Journal of Mining and Mineral Engineering, 2019

In this study, the cokriging model was used for determining the geochemical concentrations in Jan... more In this study, the cokriging model was used for determining the geochemical concentrations in Janja, SE Iran. Cokriging is a multivariate prediction method in spatial statistics which considers the spatial dependence as well as predicting the dependence between variables. In addition, fractal concentration-area (C-A) model was used for determining the geochemical anomalies in Janja region. Eight elements (Au, Cu, Mn, Zn, Fe, As, Mo and Pb) from 300 stream sediment samples were used to identify geochemical anomalies. The geochemical maps obtained from cokriging and fractal modelling showed that geochemical anomalies for copper and gold are located in the north, NW, and centre of the study area. Comparing the anomalies maps of the elements showed a correlation between elements of gold, copper, molybdenum, and iron in the region. Also, a negative correlation was determined between arsenic with gold and copper elements and there was not any correlation between the gold and copper elements of the region with manganese, lead, and zinc. For examining the results of the studies more closely, some of the data were analysed and evaluated using concentration-area (C-A) fractal model.

$Research paper thumbnail of Separation of geochemical anomalies using inverse distant weighting (IDW) and concentration-area (C-A) fractal modeling based on stream sediments data in Janja region, SE Iran$

Separation of geochemical anomalies using inverse distant weighting (IDW) and concentration-area (C-A) fractal modeling based on stream sediments data in Janja region, SE Iran

Bulletin Of The Mineral Research and Exploration, 2017

Separation of geochemical anomalies using inverse distant weighting (IDW) and concentration-area ... more

Laboratory Investigation to Use Lost Circulation Material in Water Base Drilling Fluid as Lost Circulation Pills

International Journal of Mining Science, 2016

The increase of the demand of oil and also the price causes research in inventing new technology ... more The increase of the demand of oil and also the price causes research in inventing new technology such as non-damaging lost circulation pills (LCP) to produce more oil with less cost. Optimizing the LCP compositions to stop the lost circulation effectively and also protect the production zone from liquid and solids invasion significantly. Key parameters include of Shape, particle size distribution and concentration of the lost circulation materials (LCM) are necessary to determine the effectiveness of LCP.In this study, the Permeability Plugging Apparatus (PPA) is used to evaluate effectiveness of sized calcium carbonates in different concentrations to cure the lost circulation. Ceramic disks with nominal pore sizes 20, 35, 60 microns, are used to simulate lost circulation zones. Spurt loss and filtrate volume are primary parameters to be evaluated in this research.

Ordinary kriging for the estimation of vein type copper deposit: A case study of the Chelkureh, Iran

Journal of Mining and Metallurgy A: Mining, 2015

Estimation of mineral resources and reserves with low values of error is essential in mineral exp... more Estimation of mineral resources and reserves with low values of error is essential in mineral exploration. The aim of this study is to estimate and model a vein type copper deposit using ordinary kriging method. After studying of variograms in different directions it was found out that the ore deposit has no anisotropy. The best fitted variogram model was considered for ordinary kriging estimation. Cross-validation was used to evaluate the accuracy of the variogram model for kriging. After trial and error a variogram with the best summary statistics was chosen. Model consists of a pure nugget effect with 0,30 amplitude plus a spherical scheme with sill 1.10 and range 30 m. The cross validation results showed that the correlation coefficient between estimated and real data was 0.829. The resource was classified based on calculated estimation errors by JORC code. Results showed that ordinary kriging can be used to model and estimate the vein type deposit. Consequently a three dimensional model of estimated value and error estimated value was provided by ordinary kriging to divide the ore into an economic and uneconomic part.

Experimental investigation of new additive to optimize the properties of synthetic-based drilling fluid

Journal of Mining and Metallurgy A: Mining, 2016

This paper focus on the design, development and testing two type of synthetic based drilling flui... more This paper focus on the design, development and testing two type of synthetic based drilling fluid include of amine-treated Quebracho agent and Polymeric Fluid Loss agent. Amine-treated Quebracho agent is compatible with other chemical additives in Synthetic-Based Fluids and it shows high-temperature stability, low fluid losses and good Rheological properties. Traditionally invert emulsion drilling fluids have been used to optimize drilling performance primarily due to the high level of wellbore stability and high penetration rates shown while using these fluids. Invert emulsion fluids require various additives such as emulsifiers, fluid-los-control (FLC) agents, viscosifier etc. The paper includes the laboratory evaluation for high temperature application of two agents in invert emulsion drilling fluids.

Experimental Investigation of Formulation and Field Performance of Formate Based Drilling Fluid System for Vertical Well Drilling

International Journal of Mining Science, 2016

A formate-based fluid has been successfully used in many HPHT well operations since they introduc... more A formate-based fluid has been successfully used in many HPHT well operations since they introduced in field practice. They have many advantages when compared with conventional HPHT drilling fluids such as: minimal formation damage, maintenance of additive properties at high temperatures, reduced hydraulic flow resistance, low potential for differential sticking, etc. Formate-based fluids can be applied during deep slim hole drilling, shale drilling, and reservoir drilling, salt and gas hydrate formations drilling. The laboratory research was carried out to determine composition of formate base drilling fluid. It was formulated using sodium and potassiumformate salts, KCL, starch and lime stone. Formate base mud is solid free system. So, mud cake is thin and resilient, it is conductive to improve cementing quality greatly. In these experiments, formate based drilling fluids containing two types of formate salt (NaF and KF) at different concentrations were tested by a Fan-50 viscometer. Experiments show that the formate drilling system has good rheological property and strong inhibition ability. It shows that potassium formate improves the thermal stability of polymers. Formate based drilling fluid achieve sufficient mud weight around 77 pcf was selected for field trial in one of the exploratory wells. Formate based brineis a free-solid Water Base Mud (WBM) which maintains rheological stability at high temperature and minimizes drilling problems. This case study shows how Formate based mud enhanced the wellbore stability and reduced the testing time and cost. Based on the success fulfield test results, it is planned to drill other deep formation with Formate based fluids in future.

Experimental Investigation of Using Nano Fluid to Improve Productivity Index on Enhancing Oil Recovery

International Journal of Mining Science, 2016

As many oil fields go into their final stage of production, novel technologies are necessary in o... more As many oil fields go into their final stage of production, novel technologies are necessary in order to maintain the production and increase the recovery of hydrocarbons. Therefore, advanced technology like Nanotechnology should be coming to overcome the problem of low recovery from reservoirs. Nano fluids were injected as a tertiary recovery method following a secondary water flooding. The experiments were performed at ambient conditions. Interfacial tensions and contact angles were measured in order to help explain the underlying mechanisms behind the increased recovery. In this research paper, the effect of silica nano and carbon nano particles on the wettability alteration in one of the Iran Sand Stone reservoir is mentioned. The results obtained from experiments show that these nano particles are suitable enhanced oil recovery (E.O.R) agents in water wet sand stone formations. Silica nano and carbon nano particles demonstrated same results in the wettability alteration of core plug. It was observed that the oil recovery increased by 5% when 0.05 wt. % Sio 2 nano fluid was injected into the core sample in a tertiary mode.

$Research paper thumbnail of Comparative study of C–A, C–P, and N–S fractal methods for separating geochemical anomalies from background: A case study of Kamoshgaran region, northwest of Iran$

Comparative study of C–A, C–P, and N–S fractal methods for separating geochemical anomalies from background: A case study of Kamoshgaran region, northwest of Iran

Journal of Geochemical Exploration, 2015

Separation of geochemical anomalies from background is a fundamental topic in the field of geoche... more Separation of geochemical anomalies from background is a fundamental topic in the field of geochemical exploration. Fractal and multifractal modeling of geochemical data are among these methods and have been used by many geoscientists for more than two decades. In this study, three fractal methods, consisting of concentration-area (C-A), concentration-perimeter (C-P), and number-size (N-S) methods, were applied to identify geochemical anomalies in 317 stream sediment samples from Kamoshgaran region, Kurdestan province, northwest of Iran. Implementation of C-A, C-P, and N-S methods showed that southwestern, eastern, and central parts of Kamoshgaran region were the most important parts and future detailed exploration including lithogeochemical sampling should be focused on these parts. Also, a good relationship was found between alteration units and anomalous areas using fractal methods. Results also demonstrated a strongly positive relationship between As and Au anomalous areas in the region. The resulted thresholds for C-A and C-P methods were slightly different; consequently, the suggested anomalous areas were slightly different. In addition, distinction of the anomalous areas in terms of Au, Cu, and Mo based on N-S method was much better, which could be attributed to

Corrigendum to “Reserve estimation of central part of Choghart north anomaly iron ore deposit through ordinary kriging method” [Int J Min Sci Technol 2012;22:573–577]

International Journal of Mining Science and Technology, 2014

Please cite this article in press as: Daya AA. Corrigendum to ‘‘Reserve estimation of central par... more

Aplikasi Pencarian Tempat Wisata Kuliner Berbasis Android 2.2 Menggunakan Eclipse Helios

Penulisan Ilmiah Jenjang D3 Ilmu Komputer, Nov 3, 2012

Kemajuan teknologi pada abad ke-21 ini berkembang dengan begitu cepatnya sesusai dengan permintaa... more Kemajuan teknologi pada abad ke-21 ini berkembang dengan begitu cepatnya sesusai dengan permintaan dan tuntutan penggunanya yang harus cepat, tepat, mobile dan efisien sehingga produsenpun dituntut untuk lebih kreatif dan inovatif dalam mengembangkannya, ditambah persaingan pasar teknologi yang semakin opensource terutama yang berbasis smart phone. Sistem operasi baru pada mobile yang open source tersebut saat ini kita mengenalnya dengan nama android.Pada penulisan ilmiah ini permasalahan yang diangkat yaitu membuat sebuah program aplikasi pencarian tempat wisatakuliner di kotaDepok. Dalam aplikasi LBS ini, pengguna nantinya akan mengetahui lokasi keberadaan tempatkuliner di Depoksesuaidenganyangadadalampeta.Program aplikasi pencari tempat wisatakuliner ini dibuat dengan menggunakan bahasa pemrograman Java dan untuk media aplikasinyamenggunakan Eclipse pulsar helios SR2 Win32 untuk sistem operasi android pada mobile. DaftarPustaka(2011-2012)

Survey about the role of appearance concern with skin cancer prevention behavior based on protection motivation theory

Dermatology and Cosmetic, Jun 1, 2010

Experimental Study of Engineered Cement Plug to Effectively Cure Losses While Drilling in Iranian Oil/Gas Well

International Journal of Geosciences, 2016

Mud losses are one of the most severe problems encountered in drilling. This is commonly known as... more Mud losses are one of the most severe problems encountered in drilling. This is commonly known as lost circulation. It can occur in naturally fractured formations and also can be induced in formations through drilling. Mud losses while drilling leading to cost overruns and HSE concerns, primary cement job failure due to not getting the cement up to the desired height resulting in subsequent sustained casing pressure and corrosion, not able to perform work over activity on certain wells due to losses. The objective of this paper is to explain extreme lost circulation problem and introduce cement plug formulation to cure or mitigate this problem. In addition, the cement plug has certain compressive strength that this is proper for use to control lost circulation in field. And finally, the application of a cement plug is described in one well of the Gas Field (National Iranian Oil Company).

Fuzzy Analytical Hierarchy Process for Mineral Exploration Potential Mapping: a Case Study in Kamoshgaran Region (NW, Iran)

ABSTRACT

Application of concentration–area method for separating geochemical anomalies from background: a case study of Shorabhaji region, northwest of Iran

Arabian Journal of Geosciences, 2014

The aim of current study is to separate geochemical anomalies from background based on stream sed... more The aim of current study is to separate geochemical anomalies from background based on stream sediments data by utilizing the concentration–area (C–A) fractal model in Shorabhaji region, northwest of Iran. Stream sediments data were used in this study which was conducted for the primary regional exploration for eight elements (As, Ti, Ag, Cu, Pb, Sn, W, and Au) in Shorabhaji region. Log–log plots for these elements show three populations including low, medium, and high anomaly. Threshold values for the region were computed based on these log–log plots. The thresholds were identified for Ag (1.5 ppm), Ti (1.8 ppm), Ag (1.5 ppm), Cu (1.55 ppm), Pb (1.57 ppm), Sn (1.58 ppm), W (1.78 ppm), and Au (1.25 ppm). Based on the thresholds of the C–A model, the anomaly maps of elements were drawn. There was a good relationship between lithological units and anomalous areas obtained by concentration–area fractal method.

Nonlinear disjunctive kriging for the estimating and modeling of a vein copper deposit

Iranian Journal of Earth Sciences, Jul 1, 2019

Estimation of mineral resources and reserves with low values of error is essential in mineral exp... more Estimation of mineral resources and reserves with low values of error is essential in mineral exploration. The aim of this study is to estimate and model a vein type deposit using disjunctive kriging method. Disjunctive Kriging (DK) as an appropriate nonlinear estimation method has been used for estimation of Cu values. For estimation of Cu values and modeling of the distribution of Cu in Chelkureh, samples have been taken from 48 drill holes in Chelkureh, and the values of Cu have been analyzed. Resulting data from analyzing Cu values were converted to standard normal values using Hermite polynomials. Variography has been done in the Chelkureh deposit. After studying variograms in different directions, it was found out that the ore deposit has a mild anisotropy. The best-fitted variogram model was considered for disjunctive kriging estimation. The model consists of a pure nugget effect with 0.46 amplitude plus a spherical scheme with sill 1.20 and range 140 m. Consequently, a three-dimensional model of estimated value and error estimated value was provided by disjunctive kriging to divide the ore into an economic and uneconomic part. The models based on the estimate of the DK method in the study area exhibited an increasing trend of concentration from the center to North. Finally, validation between the disjunctive kriging carried out by using cross-validation. The result showed that the correlation of estimated values and real values was strong (63.4%).

Selection of chromite processing plant site using fuzzy analytic hierarchy process (FAHP)

Journal of Mining and Environment, 2017

Based on existence of the chromite deposits in the Sistan and Baluchestan province in Iran, and a... more Based on existence of the chromite deposits in the Sistan and Baluchestan province in Iran, and also various applications of chromite in different industries, it is expected that the establishment of chromite processing plant is required in the erelong. The geographical location of a processing plant can have a strong influence on the success of an industrial venture. The processing plant site selection is a multi-criteria decision problem. The conventional methods used for a plant location selection are inadequate for dealing with the imprecise or vague nature of a linguistic assessment. To overcome this difficulty, the fuzzy multi-criteria decision-making methods are proposed. This paper presents an application of the analytic hierarchy process (AHP) method based on the fuzzy sets (Fuzzy AHP) used to select an appropriate site for a chromite processing plant in the Sistan and Baluchestan province. For this purpose, based on the concentration of chromite deposits in different regio...

Choghart kuzey demir cevheri yatağı anomalisi için ayırıcı kriging yöntemiyle jeoistatistiksel tenör modellemesi

This paper is devoted to the application of the disjunctive kriging method in the Choghart north ... more This paper is devoted to the application of the disjunctive kriging method in the Choghart north anomaly iron ore deposit in Yazd province, Iran. The local distributions of the values of a regionalized attribute at unsampled locations can be assessed by disjunctive kriging. The case study consists of borehole samples measuring the iron concentration. A Gaussian isofactorial model is fitted to these data and disjunctive kriging was used to assess the local probabilities that the actual concentrations exceed a threshold value and to divide the ore into an economic and uneconomic parts. The tools and concepts are complemented by a set of computer programs and applied to the case study. The study showed that disjunctive kriging can be applied successfully for modeling the grade of an ore deposit.

[Effects of expression silencing of MAGE3 by RNA interference on location and metastasis of lung carcinoma cells]

Zhonghua yi xue za zhi, 2006

OBJECTIVE To construct small interfering RNA (siRNA) expression vectors targeting human MAGE3 gen... more OBJECTIVE To construct small interfering RNA (siRNA) expression vectors targeting human MAGE3 gene and to observe the effects of gene silencing of MAGE3 by RNA interference on location and metastasis of lung carcinoma cells. METHODS MAGE3 mRNA targeted hairpin siRNA was devised and the oligonucleotide strands of DNA fragments encoding the above siRNA were synthesized. After annealing of the complementary strands, the DNA fragments were cloned into pSUPERneoGFP, followed by amplification and DNA sequencing, then transfected into human lung carcinoma NCI-H446. The expression of MAGE3 gene mRNA and protein were examined by RT-PCR and Western blotting. Colony formation assay and Boyden chamber assay were performed to detect the effects of MAGE3 on colony formation and metastasis. RESULTS The DNA fragments encoding MAGE3-targeted siRNA were cloned into the pSUPERneoGFP and confirmed by restrictive enzyme digestion and DNA sequencing. RT-PCR and Western blotting revealed a strongly decrea...

A Comparative Analysis Between Disjunctive Kriging and Ordinary Kriging for Estimating the Reserve of a Mine; a Case Study of Choghart Iron Ore Deposit

From a geostatistical viewpoint, non-linear interpolation is an attempt to estimate the condition... more From a geostatistical viewpoint, non-linear interpolation is an attempt to estimate the conditional expectation, and further the conditional distribution of grade at a location, as opposed to simply predicting the grade itself. There are many non-linear methods now available. Disjunctive Kriging is one of them. This paper presents a comparison of ordinary kriging and disjunctive kriging in Choghart iron ore deposit in Yazd province, Iran. The case study consists of borehole samples measuring the Fe concentration. The sample data used in this study consist of exploration drilling data, suitably composited. The data set is irregularly spaced and has an almost normal distribution. Fe grade was selected as the major regional variable on which the present research has focused. To carry out ordinary kriging and disjunctive kriging, spherical model was fitted over empirical variogram. To estimate the Iron grade, ordinary kriging and disjunctive kriging methods were used. All of the exploit...

$Research paper thumbnail of Comparative analysis between concentration- number (C-N) and concentration- area (C-A) fractal models for separating anomaly from background in Siahrood 100,000 sheet, NW Iran$

Comparative analysis between concentration- number (C-N) and concentration- area (C-A) fractal models for separating anomaly from background in Siahrood 100,000 sheet, NW Iran

Journal of Aalytical and Numerical Methods in Mining Engineering, Feb 1, 2018

$Research paper thumbnail of Application and comparison of the cokriging and the fractal model for identifying geochemical anomalies in Janja area, SE Iran$

Application and comparison of the cokriging and the fractal model for identifying geochemical anomalies in Janja area, SE Iran

International Journal of Mining and Mineral Engineering, 2019

In this study, the cokriging model was used for determining the geochemical concentrations in Jan... more In this study, the cokriging model was used for determining the geochemical concentrations in Janja, SE Iran. Cokriging is a multivariate prediction method in spatial statistics which considers the spatial dependence as well as predicting the dependence between variables. In addition, fractal concentration-area (C-A) model was used for determining the geochemical anomalies in Janja region. Eight elements (Au, Cu, Mn, Zn, Fe, As, Mo and Pb) from 300 stream sediment samples were used to identify geochemical anomalies. The geochemical maps obtained from cokriging and fractal modelling showed that geochemical anomalies for copper and gold are located in the north, NW, and centre of the study area. Comparing the anomalies maps of the elements showed a correlation between elements of gold, copper, molybdenum, and iron in the region. Also, a negative correlation was determined between arsenic with gold and copper elements and there was not any correlation between the gold and copper elements of the region with manganese, lead, and zinc. For examining the results of the studies more closely, some of the data were analysed and evaluated using concentration-area (C-A) fractal model.

$Research paper thumbnail of Separation of geochemical anomalies using inverse distant weighting (IDW) and concentration-area (C-A) fractal modeling based on stream sediments data in Janja region, SE Iran$

Separation of geochemical anomalies using inverse distant weighting (IDW) and concentration-area (C-A) fractal modeling based on stream sediments data in Janja region, SE Iran

Bulletin Of The Mineral Research and Exploration, 2017

Separation of geochemical anomalies using inverse distant weighting (IDW) and concentration-area ... more

Laboratory Investigation to Use Lost Circulation Material in Water Base Drilling Fluid as Lost Circulation Pills

International Journal of Mining Science, 2016

The increase of the demand of oil and also the price causes research in inventing new technology ... more The increase of the demand of oil and also the price causes research in inventing new technology such as non-damaging lost circulation pills (LCP) to produce more oil with less cost. Optimizing the LCP compositions to stop the lost circulation effectively and also protect the production zone from liquid and solids invasion significantly. Key parameters include of Shape, particle size distribution and concentration of the lost circulation materials (LCM) are necessary to determine the effectiveness of LCP.In this study, the Permeability Plugging Apparatus (PPA) is used to evaluate effectiveness of sized calcium carbonates in different concentrations to cure the lost circulation. Ceramic disks with nominal pore sizes 20, 35, 60 microns, are used to simulate lost circulation zones. Spurt loss and filtrate volume are primary parameters to be evaluated in this research.

Ordinary kriging for the estimation of vein type copper deposit: A case study of the Chelkureh, Iran

Journal of Mining and Metallurgy A: Mining, 2015

Estimation of mineral resources and reserves with low values of error is essential in mineral exp... more Estimation of mineral resources and reserves with low values of error is essential in mineral exploration. The aim of this study is to estimate and model a vein type copper deposit using ordinary kriging method. After studying of variograms in different directions it was found out that the ore deposit has no anisotropy. The best fitted variogram model was considered for ordinary kriging estimation. Cross-validation was used to evaluate the accuracy of the variogram model for kriging. After trial and error a variogram with the best summary statistics was chosen. Model consists of a pure nugget effect with 0,30 amplitude plus a spherical scheme with sill 1.10 and range 30 m. The cross validation results showed that the correlation coefficient between estimated and real data was 0.829. The resource was classified based on calculated estimation errors by JORC code. Results showed that ordinary kriging can be used to model and estimate the vein type deposit. Consequently a three dimensional model of estimated value and error estimated value was provided by ordinary kriging to divide the ore into an economic and uneconomic part.

Experimental investigation of new additive to optimize the properties of synthetic-based drilling fluid

Journal of Mining and Metallurgy A: Mining, 2016

This paper focus on the design, development and testing two type of synthetic based drilling flui... more This paper focus on the design, development and testing two type of synthetic based drilling fluid include of amine-treated Quebracho agent and Polymeric Fluid Loss agent. Amine-treated Quebracho agent is compatible with other chemical additives in Synthetic-Based Fluids and it shows high-temperature stability, low fluid losses and good Rheological properties. Traditionally invert emulsion drilling fluids have been used to optimize drilling performance primarily due to the high level of wellbore stability and high penetration rates shown while using these fluids. Invert emulsion fluids require various additives such as emulsifiers, fluid-los-control (FLC) agents, viscosifier etc. The paper includes the laboratory evaluation for high temperature application of two agents in invert emulsion drilling fluids.

Experimental Investigation of Formulation and Field Performance of Formate Based Drilling Fluid System for Vertical Well Drilling

International Journal of Mining Science, 2016

A formate-based fluid has been successfully used in many HPHT well operations since they introduc... more A formate-based fluid has been successfully used in many HPHT well operations since they introduced in field practice. They have many advantages when compared with conventional HPHT drilling fluids such as: minimal formation damage, maintenance of additive properties at high temperatures, reduced hydraulic flow resistance, low potential for differential sticking, etc. Formate-based fluids can be applied during deep slim hole drilling, shale drilling, and reservoir drilling, salt and gas hydrate formations drilling. The laboratory research was carried out to determine composition of formate base drilling fluid. It was formulated using sodium and potassiumformate salts, KCL, starch and lime stone. Formate base mud is solid free system. So, mud cake is thin and resilient, it is conductive to improve cementing quality greatly. In these experiments, formate based drilling fluids containing two types of formate salt (NaF and KF) at different concentrations were tested by a Fan-50 viscometer. Experiments show that the formate drilling system has good rheological property and strong inhibition ability. It shows that potassium formate improves the thermal stability of polymers. Formate based drilling fluid achieve sufficient mud weight around 77 pcf was selected for field trial in one of the exploratory wells. Formate based brineis a free-solid Water Base Mud (WBM) which maintains rheological stability at high temperature and minimizes drilling problems. This case study shows how Formate based mud enhanced the wellbore stability and reduced the testing time and cost. Based on the success fulfield test results, it is planned to drill other deep formation with Formate based fluids in future.

Experimental Investigation of Using Nano Fluid to Improve Productivity Index on Enhancing Oil Recovery

International Journal of Mining Science, 2016

As many oil fields go into their final stage of production, novel technologies are necessary in o... more As many oil fields go into their final stage of production, novel technologies are necessary in order to maintain the production and increase the recovery of hydrocarbons. Therefore, advanced technology like Nanotechnology should be coming to overcome the problem of low recovery from reservoirs. Nano fluids were injected as a tertiary recovery method following a secondary water flooding. The experiments were performed at ambient conditions. Interfacial tensions and contact angles were measured in order to help explain the underlying mechanisms behind the increased recovery. In this research paper, the effect of silica nano and carbon nano particles on the wettability alteration in one of the Iran Sand Stone reservoir is mentioned. The results obtained from experiments show that these nano particles are suitable enhanced oil recovery (E.O.R) agents in water wet sand stone formations. Silica nano and carbon nano particles demonstrated same results in the wettability alteration of core plug. It was observed that the oil recovery increased by 5% when 0.05 wt. % Sio 2 nano fluid was injected into the core sample in a tertiary mode.

$Research paper thumbnail of Comparative study of C–A, C–P, and N–S fractal methods for separating geochemical anomalies from background: A case study of Kamoshgaran region, northwest of Iran$

Comparative study of C–A, C–P, and N–S fractal methods for separating geochemical anomalies from background: A case study of Kamoshgaran region, northwest of Iran

Journal of Geochemical Exploration, 2015

Separation of geochemical anomalies from background is a fundamental topic in the field of geoche... more Separation of geochemical anomalies from background is a fundamental topic in the field of geochemical exploration. Fractal and multifractal modeling of geochemical data are among these methods and have been used by many geoscientists for more than two decades. In this study, three fractal methods, consisting of concentration-area (C-A), concentration-perimeter (C-P), and number-size (N-S) methods, were applied to identify geochemical anomalies in 317 stream sediment samples from Kamoshgaran region, Kurdestan province, northwest of Iran. Implementation of C-A, C-P, and N-S methods showed that southwestern, eastern, and central parts of Kamoshgaran region were the most important parts and future detailed exploration including lithogeochemical sampling should be focused on these parts. Also, a good relationship was found between alteration units and anomalous areas using fractal methods. Results also demonstrated a strongly positive relationship between As and Au anomalous areas in the region. The resulted thresholds for C-A and C-P methods were slightly different; consequently, the suggested anomalous areas were slightly different. In addition, distinction of the anomalous areas in terms of Au, Cu, and Mo based on N-S method was much better, which could be attributed to

Corrigendum to “Reserve estimation of central part of Choghart north anomaly iron ore deposit through ordinary kriging method” [Int J Min Sci Technol 2012;22:573–577]

International Journal of Mining Science and Technology, 2014

Please cite this article in press as: Daya AA. Corrigendum to ‘‘Reserve estimation of central par... more

Aplikasi Pencarian Tempat Wisata Kuliner Berbasis Android 2.2 Menggunakan Eclipse Helios

Penulisan Ilmiah Jenjang D3 Ilmu Komputer, Nov 3, 2012

Kemajuan teknologi pada abad ke-21 ini berkembang dengan begitu cepatnya sesusai dengan permintaa... more Kemajuan teknologi pada abad ke-21 ini berkembang dengan begitu cepatnya sesusai dengan permintaan dan tuntutan penggunanya yang harus cepat, tepat, mobile dan efisien sehingga produsenpun dituntut untuk lebih kreatif dan inovatif dalam mengembangkannya, ditambah persaingan pasar teknologi yang semakin opensource terutama yang berbasis smart phone. Sistem operasi baru pada mobile yang open source tersebut saat ini kita mengenalnya dengan nama android.Pada penulisan ilmiah ini permasalahan yang diangkat yaitu membuat sebuah program aplikasi pencarian tempat wisatakuliner di kotaDepok. Dalam aplikasi LBS ini, pengguna nantinya akan mengetahui lokasi keberadaan tempatkuliner di Depoksesuaidenganyangadadalampeta.Program aplikasi pencari tempat wisatakuliner ini dibuat dengan menggunakan bahasa pemrograman Java dan untuk media aplikasinyamenggunakan Eclipse pulsar helios SR2 Win32 untuk sistem operasi android pada mobile. DaftarPustaka(2011-2012)

Survey about the role of appearance concern with skin cancer prevention behavior based on protection motivation theory

Dermatology and Cosmetic, Jun 1, 2010

Experimental Study of Engineered Cement Plug to Effectively Cure Losses While Drilling in Iranian Oil/Gas Well

International Journal of Geosciences, 2016

Mud losses are one of the most severe problems encountered in drilling. This is commonly known as... more Mud losses are one of the most severe problems encountered in drilling. This is commonly known as lost circulation. It can occur in naturally fractured formations and also can be induced in formations through drilling. Mud losses while drilling leading to cost overruns and HSE concerns, primary cement job failure due to not getting the cement up to the desired height resulting in subsequent sustained casing pressure and corrosion, not able to perform work over activity on certain wells due to losses. The objective of this paper is to explain extreme lost circulation problem and introduce cement plug formulation to cure or mitigate this problem. In addition, the cement plug has certain compressive strength that this is proper for use to control lost circulation in field. And finally, the application of a cement plug is described in one well of the Gas Field (National Iranian Oil Company).

Fuzzy Analytical Hierarchy Process for Mineral Exploration Potential Mapping: a Case Study in Kamoshgaran Region (NW, Iran)

ABSTRACT

Application of concentration–area method for separating geochemical anomalies from background: a case study of Shorabhaji region, northwest of Iran

Arabian Journal of Geosciences, 2014

The aim of current study is to separate geochemical anomalies from background based on stream sed... more The aim of current study is to separate geochemical anomalies from background based on stream sediments data by utilizing the concentration–area (C–A) fractal model in Shorabhaji region, northwest of Iran. Stream sediments data were used in this study which was conducted for the primary regional exploration for eight elements (As, Ti, Ag, Cu, Pb, Sn, W, and Au) in Shorabhaji region. Log–log plots for these elements show three populations including low, medium, and high anomaly. Threshold values for the region were computed based on these log–log plots. The thresholds were identified for Ag (1.5 ppm), Ti (1.8 ppm), Ag (1.5 ppm), Cu (1.55 ppm), Pb (1.57 ppm), Sn (1.58 ppm), W (1.78 ppm), and Au (1.25 ppm). Based on the thresholds of the C–A model, the anomaly maps of elements were drawn. There was a good relationship between lithological units and anomalous areas obtained by concentration–area fractal method.