paradoxical effects of drugs on cognitive function the neuropsychopharmacology of the dopamine and other neurotransmitter systems
Dielectrics in electric fields (1)
Ngày tải lên :
21/03/2014, 12:08
... deleterious effects of high electric fields and/ or high temperatures occur in the form of conduction currents and the complex mechanism of conduction is explained in terms of the band picture of the ... study of the dielectric constant (Ch 2) The band theory of solids is included because it is required to understand the energy levels of a dielectric, as in the conduction and formation of space ... dielectric function 6.3.1 Cole-Cole function 6.3.2 Davidson-Cole function 6.3.3 Fuoss-Kirkwood function 6.3.4 Havriliak-Negami function 6.4 The Williams-Watts function 6.5 The G(i) function for William-Watt...
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dielectrics in electric fields (2)
Ngày tải lên :
21/03/2014, 12:08
... penetrates the barrier and appears on the right of the barrier", (with permission of McGraw Hill Ltd., Boston) 1.6 BAND THEORY OF SOLIDS A brief description of the band theory of solids is provided ... (1) Thermionic Emission (Richardson-Bushman equation): (1.84) where J is the current density, (|) the work function, T the absolute temperature and R the reflection co-efficient of the electron ... DISTRIBUTION FUNCTION We consider now the distribution of energies of particles in a gas A detailed discussion of energy distribution of electrons is given in chapter and the present discussion is...
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dielectrics in electric fields (3)
Ngày tải lên :
21/03/2014, 12:08
... POLARIZATION The classical view of the structure of the atom is that the center of the atom consists of positively charged protons and electrically neutral neutrons The electrons move about the nucleus ... of the cavity is zero and there are no short range interactions between the molecules in the cavity The internal field, Ej at the center of the cavity is the sum of the contributions due to The ... than the induced dipole moment due to electronic polarization of non-polar molecules, the contribution of the permanent dipole moment to the polarization of the material is of the same order of...
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dielectrics in electric fields (4)
Ngày tải lên :
21/03/2014, 12:08
... terms of two independent parameters, a and P, by Havriliak and Negami, their susceptibility function having the form: Figs 3.24 (b) and (c) show the variation of these functions as a function of ... slope of the line gives an activation energy of 0.58 eV, a further discussion of which is beyond the scope of the book We will make use of equation (3.60) in understanding the behavior of amorphous ... frequency The similarities and divergences of these functions may be summarized as follows: The Debye function is symmetrical about cop and narrower than the Cole-Cole and Davidson-Cole functions The...
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dielectrics in electric fields (5)
Ngày tải lên :
21/03/2014, 12:08
... Reserved E-Field The theory of Dissado and Hill is significant in that the application of their theory provides information on the structure of the material, though on a coarse scale The inter-cluster ... motion is due to the vibration of neighboring ions of opposite charges, such as the movement of K+ and Cl" ions, resembling a dipole of varying moment The frequency of this oscillation is of the ... of infrared spectra have given data of inter-atomic forces and the shape of the electron distribution A discussion of these are beyond the scope of this book Fig 4.12 Dispersion (real part) and...
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dielectrics in electric fields (6)
Ngày tải lên :
21/03/2014, 12:08
... double bond and a functionality of two Depending on the functionality of the monomer the polymer will be linear if bifunctional, branched or cross linked in three dimensions if tri-functional If ... polymerization the aggregate of Z monomers make a contribution of Z u2 to the second term in equation (5.1) After polymerization the contribution of this term depends upon one of the three possibilities: ... arrangement of their molecules Two terminologies are commonly used; configuration and conformation Configuration is the arrangement of atoms in the adjacent monomer units and it is determined by the...
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dielectrics in electric fields (7)
Ngày tải lên :
21/03/2014, 12:08
... equations of dielectric theory They relate the absorption current as a function of time to the dielectric constant and loss factor at constant voltage To show the generality of equations (6.15) and ... temperatures where the superposition from the other relaxation does not occur The relative merits of the superposition and the Williams ansatz in the merging region region of PMMA has been examined ... repeated on the same sample within a short interval of time A second source of ions is due to autoionization of one of the atoms in the monomer, as demonstrated by Raju (1971) in aromatic polyamide There...
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dielectrics in electric fields (8)
Ngày tải lên :
21/03/2014, 12:08
... Nc and N0 are constants The rate of thermal excitation of electrons is, therefore, equal to the rate of capture of electrons by the donors The rate of thermal excitation of electrons to conduction ... first exponential is the same as in Richardson equation for thermionic emission The second exponential represents the decrease of the work function due to the applied field, and a lowering of the ... (2) The current is a function of the number and drift velocity of electrons and not dependent on the position in the sample, z, measured from the cathode Denoting the number of electrons and the...
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dielectrics in electric fields (9)
Ngày tải lên :
21/03/2014, 12:08
... electronic excitation, dissociation, attachment, vibrational excitation and rotation, ionization), and spot the potential energy because of the concentration of the charges and their position in the ... provided their energy is equal to or higher than the work function of the cathode The number of secondary electrons liberated per incident ion is dependent on the surface conditions of the cathode ... number of neutral gas molecules for ionization On the other hand, at higher gas pressures, on the right hand side of the minimum, the number of neutral molecules is so great that frequent collisions...
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dielectrics in electric fields (10)
Ngày tải lên :
21/03/2014, 12:08
... in the extremities of the distribution as in other parts of the distribution The CPU time for both computations is claimed to be the same as long as the number of collisions are kept constant The ... the end of the non-uniform region, then decreasing in the low field region because of the decrease in the total number of electrons in the low field region There is a shift between the peak of ... the probability of collision In the event of an elastic collision the fractional loss of energy is 2m/M' where m and M' are masses of electron and SF6 molecule The direction of electron motion...
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dielectrics in electric fields (11)
Ngày tải lên :
21/03/2014, 12:08
... electrons in the conduction band, v, and the recombination cross section of the hole, arc 2) The electrons from the traps move to the conduction band due to thermal activation The change in the ... density of free carriers in the conduction band and frc is the recombination probability with the dimension of m3 s"1 The recombination probability is the product of the thermal velocity of free ... peak in the thermogram On the other hand the trap levels may form a local continuum in which case the current at any temperature is a contribution of a number of trap levels The peak in the thermogram...
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dielectrics in electric fields (12)
Ngày tải lên :
21/03/2014, 12:08
... is a function of the charge profile, of the position of the wave front in the sample, but also of the boundary conditions at the electrodes: Open circuit or short circuit conditions In the first ... polarization fields and a lattice polaron is formed The infrared 1 frequency domain is 10 -10 Hz and therefore the energy of the electron for the formation of a lattice polaron is lower, on the order of ... distortion of the otherwise regular array of atoms causes a region of polarization that moves with the electron As the electron moves away, polarization vanishes in the previous location, and that...
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Báo cáo hóa học: " Rapid Concentration of Nanoparticles with DC Dielectrophoresis in Focused Electric Fields" pot
Ngày tải lên :
22/06/2014, 00:20
... On the other hand, streaming DEP still occurred in the other regions (the left part of the concentrator) The co-existence of both streaming DEP and trapping DEP highly improved the concentration ... trapping regions, depending on the applications Furthermore, the microfluidic concentrator can be implemented in applications where concentration of targets are needed, such as the concentration of cells ... gradually The insulating concentrator was designed in this way to focus the electric field in the direction of the fluid flow (from the left to the right) The performance of the microfluidic concentrator...
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Electric and Magnetic Fields FACTS pot
Ngày tải lên :
31/03/2014, 22:20
... fields The fields are usually the highest directly under the lines and fall rapidly with distance to the sides of the line Actual field strengths will, of course, vary depending on the height of the ... information Work conducted by the National Institute of Environmental Health Sciences/Department of Energy EMF Research and Public Information Dissemination Program provides EMF research information and ... radar, military and commercial communications systems, household and industrial remote control devices, intrusion detection equipment and many others Fields from 60 Hz electrical systems are a...
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Cambridge.University.Press.A.Clinicians.Guide.to.Statistics.and.Epidemiology.in.Mental.Health.Measuring.Truth.and.Uncertainty.Jul.2009.pdf
Ngày tải lên :
24/09/2012, 09:06
... observations are right, and when they are wrong Sometimes they are one way or the other, but, more often than not, observation is wrong rather than right due to the high prevalence of confounding ... study These are not controlled by patients or doctors; they are just there in the population and they can affect the results Two other types of confounding factors exist which are the result of the ... bias and chance, we should ask of a study that it be replicated and confirmed in other samples and other settings Summary Confounding bias, chance, and causation – these are the three basic notions...
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Phân tích và đề xuất giải pháp nâng cao hiệu quả sản xuất kinh doanh của Công tyTNHH NISSEI ELECTRIC HÀ NỘI.docx
Ngày tải lên :
28/09/2012, 16:47
... kinh doanh ta phân loại theo cách khác theo tính tất yếu nhân tố, theo tính chất nhân tố, theo xu hướng tác động nhân tố nhân tố ảnh hưởng thuộc môi trường kinh doanh 1.3.1 Theo tính tất yếu nhân ... hiệu phân loại tiêu hiệu theo sau: Căn theo yêu cầu tổ chức xã hội tổ chức quản lý kinh tế cấp quản lý kinh tế quốc dân: Phân loại hiệu theo cấp hiệu ngành nghề, tiềm lực theo đơn vị kinh tế bao ... công nghệ hãng tiếng HewlettPackard, IBM, EPSON, CANON, INVENSYS, XEROX, RIHCOH, FUJITSU, APC, ABB, YOKAGAWA, SIEMENS, BOSCH, HONEYWELL, SCHNIEDER, OMRON, YASKAWA, DELL, LG, SAMSUNG, Với phương...
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Measuring Customer Satisfaction
Ngày tải lên :
23/10/2012, 13:33
... satisfaction Consequently, the customer is likely to form negative feelings and opinions about the staff involved and, perhaps, the program in general On the other hand, if the staff or consultant ... improvements in the questionnaire and measurement approach, and 3) help establish the reliability and validity of the measures of customer satisfaction Depending on the size of the program, the resources ... placement Other (i.e., everything that does not “fit” into all other categories) and and and 1, 2, & Once the categories are developed, one or more persons read each response to the question and assign...
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Materials accounting in nissei electric hanoi company
Ngày tải lên :
06/11/2012, 10:26
... the cost of materials on hand at the beginning of the period To determine the cost of the ending materials, the units on hand at the end of the period must be counted and evaluated The cost of ... makes the report of balance of the budget at the end of day, makes the report of cash balance at the end of month The accounting policy: -Fiscal year starts on Jan 1st and ends on Dec 31st The ... and Hoang Thi Lan Chi 28 Class: K42/21.06 Academy of Finance Graduation Thesis eliminating production bottleneck, and then they move their production overseas, they can make the best use of the...
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Tài liệu mở rộng quản trị mạng IP Packet Header Fields
Ngày tải lên :
13/11/2012, 11:22
... datagram to the destination, and to record the route information The option begins with the option type code The second octet is the option length which includes the option type code and the length ... information The option begins with the option type code The second octet is the option length which includes the option type code and the length octet, the pointer octet, and length-3 octets of route ... the end of each option, and need only be used if the end of the options would not otherwise coincide with the end of the internet header May be copied, introduced, or deleted on fragmentation, or...
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