27 research outputs found
ID wafering technology
Improvements in ID saws leading to lower costs for producing silicon wafers for solar cells are described. The relationships between crystal size and blade size and between the length of time it takes to slice a wafer and wafer thickness are discussed. The influence of ingot production methods on wafering performance is considered. A cost sensitivity analysis of slicing a 10 cm square ingot and economic analyses of slicing a four inch and a six inch ingot are presented. A wafering cost model based on the IPEG 2 is given
Development of Methods of Producing Large Areas of Silicon Sheet by the Slicing of Silicon Ingots Using Inside Diameter (I.D.) Saws
Methods of producing large areas of silicon sheets were developed by using inside diameter (I.D.) saws to slice silicon ingots. A 16 inch automated I.D. slicing machine was modified to accept programmable electric feed system, a crystal rotating system and a dyna-track blade monitoring and control system. The saw and accessories were used to slice 75 mm diameter single crystal silicon ingots while rotating them. The automated saw automatically recovered the wafers and loaded them into a cassette. The amount of material lost during slicing was reduced by using smaller blades than ones normally used to slice the wafers. Slicing runs on 100 mm diameter silicon is the next goal
Development of methods of producing large areas of silicon sheet by the slicing of silicon ingots using Inside-Diameter (I.D.) saws
Inside diametar wafering equipment, blades and processes were used to develop methods to produce large areas of silicon sheet. Modifications to a 16 inch STC automated saw included: programmable feed system, crystal rotating system, and STC dynatrack blade monitoring and control system. By controlling the plating operation and by grinding of the cutting edge, 16 inch ID blades with a cutting edge thickness of .22 mm can be produced. Crystal rotation mechanism was used to slice 100 mm diameter crystals with a 16 inch blade down to a thickness of .20 mm. Cutting rates with crystal rotation were generally slower than with standard plunge ID slicing techniques. Using programmed feeds and programmed rotation, maximum cutting rates were from 0.3 to 1.0 inches per minute
Development of methods of producing large areas of silicon sheet by the slicing of silicon ingots using Inside Diameter (I.D.) saws
Modifications to a 16 inch STC automated saw included: a programmable feed system; a crystal rotating system; and a STC dynatrack blade boring and control system. By controlling the plating operation and by grinding the cutting edge, 16 inch I.D. blades were produced with a cutting edge thickness of .22 mm. Crystal rotation mechanism was used to slice 100 mm diameter crystals with a 16 inch blade down to a thickness of .20 mm. Cutting rates with crystal rotation were generally slower than with standard plunge I.D. slicing techniques. Using programmed feeds and programmed rotation, maximum cutting rates were from 0.3 to 1.0 inches per minute
Mezinárodní zdanění kapitálových společností - komparace mezi ČR a Ruskem
The object of this thesis is international taxation of companies. It focuses on the comparison between the Czech Republic and the Russian Federation. The first chapter focuses on the tax systems of both countries, dealing with what kind of taxes exist and what is taxed, and all this on a general level, which is crucial for further comparison that is made in final chapters of the thesis. According to the topic, the thesis gives a description and definition of the companies, what kind of companies exists in both countries and what is related legislation. It is followed by a chapter on international taxation, describing international taxation issues on a general level and explaining main definitions it deals with, without which this issue cannot be understood. It discusses how countries avoid of double taxation on an international level, and what tools exist for it. Afterwards it explains international taxation of companies and specifically provides the analysis of The double taxation treaty between the Czech Republic and Russia, also by showing examples for better understanding of this issue.Tato práce se zabývá otázkou mezinárodního zdanění kapitálových společností. Zaměřuje se na komparaci mezi Českou republikou a Ruskou federací. První kapitola se zaměřuje na daňové systémy obou zemí, zabývá se tím, jaké druhy daní existují a jak se zdaňují, a to vše na obecné úrovni. Toto je klíčové pro další komparaci, která je provedená v závěrečných kapitolách této práce. V souladu s tématem dále práce definuje kapitálovou společnost, to, jaké druhy kapitálových společností existují, a jaká je jejich úprava v obou zemích. Na to pak navazuje kapitola o mezinárodním zdanění, přibližuje problematiku mezinárodního zdanění na obecné rovině a vysvětluje hlavní pojmy, bez kterých nezle tuto problematiku pochopit. Pojednává o tom, jak se na mezinárodní úrovni zamezuje dvojímu zdanění a jaké nástroje pro to existují. Dále potom vysvětluje mezinárodní zdanění konkrétně kapitálových společností a provádí analýzu Smlouvy o zamezení dvojího zdanění mezi ČR a Ruskem i s uvedením příkladu pro lepší pochopení této problematiky.Department of Financial Law and FinancesKatedra finančního práva a finanční vědyPrávnická fakultaFaculty of La
The isotropic correlation function of plane figures: the triangle case
The knowledge of the isotropic correlation function of a plane figure is
useful to determine the correlation function of the cylinders having the plane
figure as right-section and a given height as well as to analyze the out of
plane intensity collected in grazing incidence small-angle scattering from a
film formed by a particulate collection of these cylinders. The correlation
function of plane polygons can always be determined in closed algebraic form.
Here we report its analytic expression for the case of a triangle. The
expressions take four different forms that depend on the relative order among
the sides and the heights of the triangle.Comment: 11 pages, 2 figure
Formation and dynamics of self-sustained neutron haloes in disk accreting sources
It has been recognized long ago that the presence of hot plasma in the inner
accretion disks around black holes could lead to the neutron production via
dissociation of helium nuclei. We show that, for a broad range of accretion
parameters, neutrons effectively decouple from protons and pile up in the inner
disk leading to the formation of self-sustained halo. This means that new
neutrons in the halo are supplied mainly by the splitting of helium nuclei in
their collisions with existing neutrons. Once formed, such a halo can exist
even if the proton temperature is much lower than the energy threshold of
helium dissociation. We show that neutron haloes can be the natural source of
relativistic electrons and positrons, providing characteristic comptonization
spectra and hard spectral tails observed in many black hole candidates, and
also giving rise to relativistic outflows. Deuterium gamma-ray line at 2.2 MeV
resulting from neutron capture is also expected at a level detectable by future
INTEGRAL mission. Furthermore, the presence of a neutron halo strongly affects
the dynamics of accretion and leads to the rich variety of transient dynamical
regimes.Comment: 10 pages, submitted to Astronomy and Astrophysic
The profile of a narrow line after single scattering by Maxwellian electrons: relativistic corrections to the kernel of the integral kinetic equation
The frequency distribution of photons in frequency that results from single
Compton scattering of monochromatic radiation on thermal electrons is derived
in the mildly relativistic limit. Algebraic expressions are given for (1) the
photon redistribution function, K(nu,Omega -> nu',Omega'), and (2) the spectrum
produced in the case of isotropic incident radiation, P(nu -> nu'). The former
is a good approximation for electron temperatures kT_e < 25 keV and photon
energies hnu < 50 keV, and the latter is applicable when hnu(hnu/m_ec^2) < kT_e
< 25 keV, hnu < 50 keV. Both formulae can be used for describing the profiles
of X-ray and low-frequency lines upon scattering in hot, optically thin
plasmas, such as present in clusters of galaxies, in the coronae of accretion
disks in X-ray binaries and AGNs, during supernova explosions, etc. Both
formulae can also be employed as the kernels of the corresponding integral
kinetic equations (direction-dependent and isotropic) in the general problem of
Comptonization on thermal electrons. The K(nu,Omega -> nu',Omega') kernel, in
particular, is applicable to the problem of induced Compton interaction of
anisotropic low-frequency radiation of high brightness temperature with free
electrons in the vicinity of powerful radiosources and masers.
Fokker-Planck-type expansion (up to fourth order) of the integral kinetic
equation with the P(nu -> nu') kernel derived here leads to a generalization of
the Kompaneets equation. We further present (1) a simpler kernel that is
necessary and sufficient to derive the Kompaneets equation and (2) an
expression for the angular function for Compton scattering in a hot plasma,
which includes temperature and photon energy corrections to the Rayleigh
angular function.Comment: 29 pages, 17 figures, accepted for publication in ApJ, uses
emulateapj.sty, corrects misprints in previous astro-ph versio