neurogenesis appears to be more important for long term retention than for learning
Dielectrics in electric fields (1)
... questions of students has helped the author to understand the topics better and to a certain extent dictated the choice of topics The book begins with an introductory chapter that explains the ideas ... 2.12.1 Raleigh's formula 2.12.2 Formula of Meredith and Tobias 2.12.3 Bruggeman' s formula 2.12.4 Looyenga's formula 2.12.5 Bottcher's formula 2.13 Effect of high electric fields 2.14 Atomic polarizability ... and economy of materials For an industry pressed hard to increasingly cram more equipment capacity into ever-tighter spaces, to improve reliability, particularly mean time between failures, modern...
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dielectrics in electric fields (2)
... due to a dipole decreases more rapidly than that due to a single charge as the distance is increased Hence equation (1.3) should not be used when R « d To determine its accuracy relative to eq ... volts larger than kT Thermal excitation alone is not enough for valence electrons to jump over the forbidden gap D: In p-type semi-conductor acceptors extend the valence band to lower the forbidden ... band and are likely to be thermally excited in to that band Electrons in the ground state, however, are more likely to recombine with a free hole rather than be re-excited to the conduction band...
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dielectrics in electric fields (3)
... moment induced in the atom was shown to be Ve=(47re0R3)E (1.42) For a given atom the quantity inside the brackets is a constant and therefore the dipole moment is proportional to the applied electric ... understanding of the behavior of dielectrics Debye unit = 3.33 x 10~30C m SJ ae can be calculated to a first approximation from atomic constants For example the radius of a hydrogen atom may be taken as ... (equivalent to 1000 atmospheric pressures) the calculated values are lower by more than 5% The discrepancy is due to the fact that at such high pressures the intermolecular distance becomes comparable to...
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dielectrics in electric fields (4)
... enough energy to climb the hill and moves to well Upon arrival it returns energy to the reservoir and remain there for some time It will then acquire energy to jump to well again The number of jumps ... this topic more closely in this section Polymers generally have a number of relaxation times due to the fact that the long chains may be twisted in a complex array of molecular segments or due to ... expression becomes The empirical factor 8, between and 1, is related to the Cole-Cole parameter a according to \-a cos This expression shows that Fuoss-Kirkwood relation holds true for most materials...
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dielectrics in electric fields (5)
... relaxation time for the former could be much longer It can be as large as a few seconds in some heterogeneous materials The relaxation spectrum given by equation (4.66) has two terms; the second term is ... material many clusters exist and as long as interaction between them exists an array will be formed possessing at least a partial long range regularity The nature of the long range regularity is bounded ... optic mode (TO) Evidence for strong resonance absorption in TO mode in KC1 at 7K has been reported by Parker et al.19 Extensive studies of infrared spectra have given data of inter-atomic forces and...
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dielectrics in electric fields (6)
... low frequency peak The conductivity may be inherent to the polymer, or it may be due to absorbed moisture or deliberately increased in preparing the sample to study the variation of conductivity ... aromatics outnumber aliphatics Molecules that have more than six carbon atoms or benzene ring are mostly aromatic The presence of benzene in the backbone chain makes a polymer more rigid Hydrocarbons ... related to polyethylene with the hydrogen atom linked to alternate carbon atoms replaced with CH3 It can be prepared in isotactic, syndiotactic or atactic forms (fig 5-5) The isotactic form melts...
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dielectrics in electric fields (7)
... may also be calculated for values close to 0.5 by interpolation because values for y = may also be calculated using the Debye expression William-Watts have computed equation (6.42) for several ... curves appear to be similar to Davidson-Cole functions the latter are found to be much broader TM Copyright n 2003 by Marcel Dekker, Inc All Rights Reserved The curves become narrower for higher ... which may be summarized as follows: (1) As a is increased the distribution become more narrow and the function G(T) will attain a higher value at log (T/TH) = though there appears to be a change...
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dielectrics in electric fields (8)
... to the dielectric constant has not been theoretically derived though this relationship has been noted for a long time Fig 7.1 shows a collection of data1 for a range of materials from gases to ... result of hopping between sites, the hopping distance being calculated as 4.4-8 nm The mechanism of conduction in linear polyamides (nylons) has been shown to be due to protons with an activation ... due to a change in temperature, T, may be attributed to a change in mobility by invoking a thermally activated mobility according to E -E,\ (7.10) In an insulator it is obvious that the number...
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dielectrics in electric fields (9)
... secondary electron due to positive ions is higher than for metastables C Photoelectric Action Emission of electrons from the cathode due to photoelectric action is an important secondary mechanism ... pressure The photo-ionization cross sections for a number of gases have been measured by using line spectrum (mono-energy) rather than a continuum The cross section for this process for several molecules ... set of data for each gas to understand the discharge mechanisms and to develop theoretical approaches A number of these parameters in analytical form for several gases is provided below Table...
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dielectrics in electric fields (10)
... electric field may be as large as times the average field The field slope, which has been shown to be significant, may be quite large These aspects need to be viewed against the longer CPU time ... are required to travel a minimum distance before attaining equilibrium as they enter the non-uniform region The ionization coefficients are higher than the uniform field values for decreasing ... to discharges from the different spots or regions of the electrode In general the negative corona was observed to be less reproducible than the positive corona The condition to be satisfied for...
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dielectrics in electric fields (11)
... this excited state is longer The energy level corresponding to M may be due to metastables or traps Energy equivalent to s needs to be imparted to shift the electrons from M to E, following which ... observed to be always higher than Tc though the difference is not found to depend systematically on crystallinity The physical meaning of Tc is not clear though attempts have been made to relate it to ... considered to be evidence of dipolar mechanism for polarization A linear relationship between charge released to the external circuit, this is the integral of I(T)-t curve, with Ep considered to be evidence...
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dielectrics in electric fields (12)
... the beam must be as good as possible to give a uniform pressure pulse over the entire irradiated area Second, the duration of the laser pulse is determined by the thickness of the sample to be ... will be described first There have been several improvements in techniques that will be dealt with later The pressure probe within a dielectric causes a measurable electrical signal, due to the ... through the metallic end The charges may be injected into the solid by irradiation from a beam of photons, X-rays or gamma rays Photons in the energy range up to about 300 keV interact with a TM Copyright...
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Báo cáo hóa học: " Rapid Concentration of Nanoparticles with DC Dielectrophoresis in Focused Electric Fields" pot
... proposed concentrator design can be re-configured into a format with more or less trapping regions, depending on the applications Furthermore, the microfluidic concentrator can be implemented in ... lead to potential applications, for example, streaming DEP can be used to focus and transport particles, and trapping DEP can be used for particle concentration and filtration The mechanics behind ... streaming movement along the microchannels As the electric field increased to 120 V/cm, trapping of particles began to occur at the right (Region 1) of the concentrator (Fig 5b) Due to the focused...
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Electric and Magnetic Fields FACTS pot
... PAGE Limiting Exposure to EMF Research has not determined if exposure to EMFs could be a health risk Scientists are studying long- term exposure to low fields, exposure to certain transient waves ... are being conducted to determine if EMFs could be related to disease Epidemiology Epidemiology is the study of patterns of disease in populations Epidemiology looks for any statistical link between ... EMFs has been in progress for more than 30 years It is not reasonable to list or summarize the results of past and ongoing research in this document because of the great amount of information...
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Cambridge.University.Press.A.Clinicians.Guide.to.Statistics.and.Epidemiology.in.Mental.Health.Measuring.Truth.and.Uncertainty.Jul.2009.pdf
... (Predictor1 ) + β2 (Predictor2 ) + β3 (Predictor3 ) + β4 (Predictor4 ) + β5 (Predictor5 ) Not too many variables The number of predictors can obviously not be infinite Researchers need to define ... manipulate numbers; and I did But more importantly, I learned how to understand, conceptually, what the numbers meant I became a much better researcher, and a better teacher, and a better peer ... result) may be due to something else altogether We have constantly to be skeptical about what we think we see; we have to be aware of, and even expect, that what seems to be happening is not...
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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
... pháp to n học ứng dụng khác Hiện nay, phân tích kinh tế áp dụng nhiều phương pháp to n học ứng dụng, số lượng phương pháp to n học ứng dụng phân tích kinh tế ngày tăng Phổ biến phương pháp to n ... thác tìm nguồn hàng gắn với địa tiêu thụ hàng hoá - Phòng kế to n: gồm người có kế to n, thủ quỹ thủ kho Thực hoạt động nghiệp vụ kế to n tài công ty Có chức giúp giám đốc công ty quản lý, sử ... lý, sử dụng vốn, xác định kế hoạch kinh doanh, kế hoạch tài hàng năm, thực hạch to n kế to n theo pháp lệnh kế to n thống kê văn pháp qui nhà nước, quản lý quỹ tiền mặt - Phòng kinh doanh :...
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Measuring Customer Satisfaction
... items to the customer Face -to- face interviews, by their nature, tend to be more intimate than the other methods of data collection This intimacy can be used to communicate care and concern to customers, ... the number of customers measured is 30 or fewer each year; however, with more than 30 customers measured, it may be easier to automate the data and to use computer hardware and software to tabulate, ... different times or to link the data to customer demographic data in order to be able to identify the customer who was measured In these circumstances, a unique identification number can be created and...
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Materials accounting in nissei electric hanoi company
... Surplus materials are defined belong to enterprise: Debit Acc 152: cost of surplus materials belong to enterprise Credit Acc 711: cost of surplus materials belong to enterprise After definition, ... familiar, too In some special cases, N.E.H has to order suppliers to manufacture materials to meet the customers’ requirements These suppliers were chosen carefully before signing long- term contracts ... Materials value before n storing time + Materials value at n storing time Uninterrupted = Quantity of materials before n storing time + Quantity of materials at n Average unit price storing time...
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Tài liệu mở rộng quản trị mạng IP Packet Header Fields
... Unclassified Confidential EFTO MMMM PROG Restricted Secret Top Secret (Reserved for (Reserved for (Reserved for (Reserved for (Reserved for (Reserved for (Reserved for (Reserved for future future future ... for the source of an internet datagram to supply routing information to be used by the gateways in forwarding the datagram to the destination, and to record the route information The option begins ... for the source of an internet datagram to supply routing information to be used by the gateways in forwarding the datagram to the destination, and to record the route information The option begins...
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Phân tích và đề xuấ tgiải pháp nâng cao hiệu quả sản xuất kinh doanh của Công tyTNHH NISSEI ELECTRIC HÀ NỘI
... pháp to n học ứng dụng khác Hiện nay, phân tích kinh tế áp dụng nhiều phương pháp to n học ứng dụng, số lượng phương pháp to n học ứng dụng phân tích kinh tế ngày tăng Phổ biến phương pháp to n ... thác tìm nguồn hàng gắn với địa tiêu thụ hàng hoá Phòng kế to n: gồm người có kế to n, thủ quỹ thủ kho - Thực hoạt động nghiệp vụ kế to n tài công ty Có chức giúp giám đốc công ty quản lý, sử ... lý, sử dụng vốn, xác định kế hoạch kinh doanh, kế hoạch tài hàng năm, thực hạch to n kế to n theo pháp lệnh kế to n thống kê văn pháp qui nhà nước, quản lý quỹ tiền mặt - Phòng kinh doanh :...
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