The 13 kg sphere, made of aluminium and iron, is suspended to the wood-roof of Palazzo della Ragi... more The 13 kg sphere, made of aluminium and iron, is suspended to the wood-roof of Palazzo della Ragione, by a steel wire 20 meters long, with a Charron-Ring limiting the ellipticity of the pendulum motion. The pendulum oscillation are naturally subject to damping, due to various dissipation phenomena. In our case the mean energy is maintained constant by a pulsed magnetic field, produced by an electromagnet, placed at the centre, attracting the bob every quarter of a period. An optical sensor at the centre switches off the magnetic field when the bob passes through the equilibrium point.
The oscillation plane precession is monitored by 180 LED that are sequentially switched on: every LED marks a time interval of about 10 minutes
The results of the developlnent of two different technologies for the preparation of special surf... more The results of the developlnent of two different technologies for the preparation of special surfaces for ready-to-use ('epi-ready') InP wafers are presented. The epi-ready state was studied by means of X-ray photoelectron spectroscopy. The quality of the substrates stored for 4-12 months was tested by growing an epilayer by metal-organic vapor phase epitaxy and by characterizing it with high-resolution X-ray diffraction and photoluminescence techniques. Evidence that one of our technologies could be adopted industrially is given.
Exhibition of AFM images held in Venice on December 2017. The fascinating aspect is that starting... more Exhibition of AFM images held in Venice on December 2017. The fascinating aspect is that starting from features that Nature and AFM technique provided, i.e. the structure recorded by just grayscale acquisition, can be transferred by the artist to a piece of NanoArt. All the images in this exhibition were made by Stanislav Leesment, using afm data obtained by different authors quoted within the text.
An home-made device that mimics, at macroscopic level, the behaviour of an SFM (Scanning Force Mi... more An home-made device that mimics, at macroscopic level, the behaviour of an SFM (Scanning Force Microscope) may be used for didactic purposes aimed at clarify genesis and meaning of electronic micrographs
The results of a systematic investigation by transmission electron microscopy (TEM), cathodolumin... more The results of a systematic investigation by transmission electron microscopy (TEM), cathodoluminescence (CL), Rutherford backscattering (RBS), X-ray diffraction and topography and scanning force microscopy (SFM) techniques on several InGaAs/InP compressive and tensile strained layers covering the misfit range from −2.3 to 1.5×10−2 and grown by the metal organic vapor phase epitaxy (MOVPE) technique are reported. In compressively strained films the same dependence for the residual strain vs the film thickness as for the InGaAs/GaAs is found whereas a different strain release rate and different extended defects are found in tensile stressed InGaAs alloy. In particular in tensile stressed samples, grooves, planar defects and cracks are present in addition to the interfacial network of misfit dislocations. The correlation between the observed planar defects and the mechanisms of strain relaxation in the case of tensile strained layers is discussed.
Riassunto Un pendolo torsionale oscillante in un piano verticale, interfacciato a calcolatrice gr... more Riassunto Un pendolo torsionale oscillante in un piano verticale, interfacciato a calcolatrice grafica mediante CBL, viene proposto come strumento didattico per studiare gli aspetti principali dei sistemi nonlineari. Vengono presentati alcuni risultati sperimentali, tra cui la ...
Riassunto Si studia il moto di una altalena costituita da una barra oscillante mediante un sistem... more Riassunto Si studia il moto di una altalena costituita da una barra oscillante mediante un sistema di acquisizione dati on-line con un sensore di distanza. Si analizzano due casi: doppio fulcro e fulcro tondo. Si discutono i due diversi comportamenti e si elaborano ...
Thin films of HfO 2 are grown by metal-organic (MO)CVD on Si(001) and fused quartz substrates in ... more Thin films of HfO 2 are grown by metal-organic (MO)CVD on Si(001) and fused quartz substrates in the temperature range 400-500 °C, using a new series of bis-cyclopentadienyl bis-amino-alkoxide hafnium precursors, namely , stable in air because of their strong coordination to the metal center. The films obtained are investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Rutherford backscattering spectroscopy (RBS), and atomic force microscopy (AFM). Monoclinic phase HfO 2 (baddeleyite) films, characterized by a correct stoichiometric ratio and a granular surface morphology with a roughness/thickness ratio that decreases with increasing deposition rate, are obtained.
The main purpose of talking about nonlinear phenomena in school is to gain the students ability f... more The main purpose of talking about nonlinear phenomena in school is to gain the students ability for distinguishing nonlinear systems from linear ones by qualitative observations of the dynamics. The complex and qualitatively different behavior of nonlinear systems should ...
A short description of the lock-in technique gives an idea of the working principle of these usef... more A short description of the lock-in technique gives an idea of the working principle of these useful devices, that are spreadly used in weak signals detection, but rarely treated in introductory courses. Simple and cheap circuits, that may be easily assembled by the student are suggested, as a practical approach to this powerful technique.
... In addition, LEPLA creates a Forum and a trans-national cooperation network to promote experi... more ... In addition, LEPLA creates a Forum and a trans-national cooperation network to promote experience exchange in experimental ... self-pacing, flexible guided self-studies with self assessment of experimental results and analyses will enable the individual student to prepare ...
We propose a new tool for laboratory curricula based on computer-aided data acquisition and analy... more We propose a new tool for laboratory curricula based on computer-aided data acquisition and analysis. A pendulum coupled to a low-friction rotary sensor offers variable length, variable mass, variable oscillation plane (to change the effective gravitational restoring torque) and two different kind of damping torque: "dynamic friction" (almost constant) and "viscous" proportional to the angular velocity. Simple models implemented in common spreadsheets allow to compare the experimental results with the theoretical predictions.
Two simple experiments performed with RTL (Real Time Laboratory) offer an opportunity to make cle... more Two simple experiments performed with RTL (Real Time Laboratory) offer an opportunity to make clear for the students the difference between weight and mass, and between inertial and gravitational mass. The role of the hydrodynamic mass is also investigated, and various effects on the motion of different bodies due to the presence of air are discussed.
A shart descriptian af the lack-in tecnique gives an idea af the warking principle af these usefu... more A shart descriptian af the lack-in tecnique gives an idea af the warking principle af these useful devices, that are spreadly used in weak signals detectian, but rarely treated in introductary caurses. Simple and cheap circuits, lhat may be easily assembled by the student are suggested, as a praticai approach lo this pawerful technique.
The 13 kg sphere, made of aluminium and iron, is suspended to the wood-roof of Palazzo della Ragi... more The 13 kg sphere, made of aluminium and iron, is suspended to the wood-roof of Palazzo della Ragione, by a steel wire 20 meters long, with a Charron-Ring limiting the ellipticity of the pendulum motion. The pendulum oscillation are naturally subject to damping, due to various dissipation phenomena. In our case the mean energy is maintained constant by a pulsed magnetic field, produced by an electromagnet, placed at the centre, attracting the bob every quarter of a period. An optical sensor at the centre switches off the magnetic field when the bob passes through the equilibrium point.
The oscillation plane precession is monitored by 180 LED that are sequentially switched on: every LED marks a time interval of about 10 minutes
The results of the developlnent of two different technologies for the preparation of special surf... more The results of the developlnent of two different technologies for the preparation of special surfaces for ready-to-use ('epi-ready') InP wafers are presented. The epi-ready state was studied by means of X-ray photoelectron spectroscopy. The quality of the substrates stored for 4-12 months was tested by growing an epilayer by metal-organic vapor phase epitaxy and by characterizing it with high-resolution X-ray diffraction and photoluminescence techniques. Evidence that one of our technologies could be adopted industrially is given.
Exhibition of AFM images held in Venice on December 2017. The fascinating aspect is that starting... more Exhibition of AFM images held in Venice on December 2017. The fascinating aspect is that starting from features that Nature and AFM technique provided, i.e. the structure recorded by just grayscale acquisition, can be transferred by the artist to a piece of NanoArt. All the images in this exhibition were made by Stanislav Leesment, using afm data obtained by different authors quoted within the text.
An home-made device that mimics, at macroscopic level, the behaviour of an SFM (Scanning Force Mi... more An home-made device that mimics, at macroscopic level, the behaviour of an SFM (Scanning Force Microscope) may be used for didactic purposes aimed at clarify genesis and meaning of electronic micrographs
The results of a systematic investigation by transmission electron microscopy (TEM), cathodolumin... more The results of a systematic investigation by transmission electron microscopy (TEM), cathodoluminescence (CL), Rutherford backscattering (RBS), X-ray diffraction and topography and scanning force microscopy (SFM) techniques on several InGaAs/InP compressive and tensile strained layers covering the misfit range from −2.3 to 1.5×10−2 and grown by the metal organic vapor phase epitaxy (MOVPE) technique are reported. In compressively strained films the same dependence for the residual strain vs the film thickness as for the InGaAs/GaAs is found whereas a different strain release rate and different extended defects are found in tensile stressed InGaAs alloy. In particular in tensile stressed samples, grooves, planar defects and cracks are present in addition to the interfacial network of misfit dislocations. The correlation between the observed planar defects and the mechanisms of strain relaxation in the case of tensile strained layers is discussed.
Riassunto Un pendolo torsionale oscillante in un piano verticale, interfacciato a calcolatrice gr... more Riassunto Un pendolo torsionale oscillante in un piano verticale, interfacciato a calcolatrice grafica mediante CBL, viene proposto come strumento didattico per studiare gli aspetti principali dei sistemi nonlineari. Vengono presentati alcuni risultati sperimentali, tra cui la ...
Riassunto Si studia il moto di una altalena costituita da una barra oscillante mediante un sistem... more Riassunto Si studia il moto di una altalena costituita da una barra oscillante mediante un sistema di acquisizione dati on-line con un sensore di distanza. Si analizzano due casi: doppio fulcro e fulcro tondo. Si discutono i due diversi comportamenti e si elaborano ...
Thin films of HfO 2 are grown by metal-organic (MO)CVD on Si(001) and fused quartz substrates in ... more Thin films of HfO 2 are grown by metal-organic (MO)CVD on Si(001) and fused quartz substrates in the temperature range 400-500 °C, using a new series of bis-cyclopentadienyl bis-amino-alkoxide hafnium precursors, namely , stable in air because of their strong coordination to the metal center. The films obtained are investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Rutherford backscattering spectroscopy (RBS), and atomic force microscopy (AFM). Monoclinic phase HfO 2 (baddeleyite) films, characterized by a correct stoichiometric ratio and a granular surface morphology with a roughness/thickness ratio that decreases with increasing deposition rate, are obtained.
The main purpose of talking about nonlinear phenomena in school is to gain the students ability f... more The main purpose of talking about nonlinear phenomena in school is to gain the students ability for distinguishing nonlinear systems from linear ones by qualitative observations of the dynamics. The complex and qualitatively different behavior of nonlinear systems should ...
A short description of the lock-in technique gives an idea of the working principle of these usef... more A short description of the lock-in technique gives an idea of the working principle of these useful devices, that are spreadly used in weak signals detection, but rarely treated in introductory courses. Simple and cheap circuits, that may be easily assembled by the student are suggested, as a practical approach to this powerful technique.
... In addition, LEPLA creates a Forum and a trans-national cooperation network to promote experi... more ... In addition, LEPLA creates a Forum and a trans-national cooperation network to promote experience exchange in experimental ... self-pacing, flexible guided self-studies with self assessment of experimental results and analyses will enable the individual student to prepare ...
We propose a new tool for laboratory curricula based on computer-aided data acquisition and analy... more We propose a new tool for laboratory curricula based on computer-aided data acquisition and analysis. A pendulum coupled to a low-friction rotary sensor offers variable length, variable mass, variable oscillation plane (to change the effective gravitational restoring torque) and two different kind of damping torque: "dynamic friction" (almost constant) and "viscous" proportional to the angular velocity. Simple models implemented in common spreadsheets allow to compare the experimental results with the theoretical predictions.
Two simple experiments performed with RTL (Real Time Laboratory) offer an opportunity to make cle... more Two simple experiments performed with RTL (Real Time Laboratory) offer an opportunity to make clear for the students the difference between weight and mass, and between inertial and gravitational mass. The role of the hydrodynamic mass is also investigated, and various effects on the motion of different bodies due to the presence of air are discussed.
A shart descriptian af the lack-in tecnique gives an idea af the warking principle af these usefu... more A shart descriptian af the lack-in tecnique gives an idea af the warking principle af these useful devices, that are spreadly used in weak signals detectian, but rarely treated in introductary caurses. Simple and cheap circuits, lhat may be easily assembled by the student are suggested, as a praticai approach lo this pawerful technique.
Nuclear Instruments and Methods in Physics Research , B, 2002
New experimental data on the desorption of nanoclusters (2–40 nm) from nanodispersed layers of me... more New experimental data on the desorption of nanoclusters (2–40 nm) from nanodispersed layers of metals (Ag, Pt, In, Bi) and semiconductors (Ge, UO2, PbS) by fission fragments (FF) are reported and compared to the previously obtained data on desorption of nanoclusters of gold. It is shown that the desorption of nanoclusters from nanodispersed layers of metals and semiconductors due to
Exhibition of AFM images held in Venice on December 2017.
The fascinating aspect is that starting... more Exhibition of AFM images held in Venice on December 2017. The fascinating aspect is that starting from features that Nature and AFM technique provided, i.e. the structure recorded by just grayscale acquisition, can be transferred by the artist to a piece of NanoArt. All the images in this exhibition were made by Stanislav Leesment, using afm data obtained by different authors quoted within the text.
A torsion pendulum oscillating in a vertical plane is presented. The apparatus is designed as a m... more A torsion pendulum oscillating in a vertical plane is presented. The apparatus is designed as a mechanical didactical tool for demonstrating the basic nonlinear effects. Some typical experimental data are presented including response diagrams and transition to chaos.
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The oscillation plane precession is monitored by 180 LED that are sequentially switched on: every LED marks a time interval of about 10 minutes
Papers by Giacomo Torzo
The oscillation plane precession is monitored by 180 LED that are sequentially switched on: every LED marks a time interval of about 10 minutes
The fascinating aspect is that starting from features that Nature and AFM technique provided, i.e. the structure recorded by just grayscale acquisition, can be transferred by the artist to a piece of NanoArt.
All the images in this exhibition were made by Stanislav Leesment, using afm data obtained by different authors quoted within the text.