extremely high electromagnetic field intensity can induced exceeds voltage which can caused electrical arcs in the surrounding medium if the voltage is higher than the breakdown voltage this fact can lead to break out the

Performance of microwave activated adsorption cycle theory and experiments

Ngày tải lên : 11/09/2015, 10:16

... enhance the performance of the adsorption cycle This is one of the merits of using the microwave-activation method The third factor is the effect of metal fin-tube which is embedded in an adsorbent ... irradiation The conducting metal under the high electromagnetic field intensity creates the high surface electric current that causes voltage breakdown, and it can damage the adsorbent bed However, the ... design of fin-tube and under low electromagnetic field intensity can enhance the microwave energy absorption This phenomenon is observed in the experiment of the thesis (Section 4.6) With these advances,...

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báo cáo sinh học:" What can health care professionals in the United Kingdom learn from Malawi?" pdf

Ngày tải lên : 18/06/2014, 17:20

... baby's scalp, and the mother's body acts as an incubator (Additional file 2) Breast milk is expressed directly into the baby's mouth, or onto cotton wool and then squeezed gently into the baby "Kangaroo ... by their "guardians", usually a grandmother They take it in turn to nurse the baby While one is lying with the baby in the "kangaroo" position, the other prepares food and talks with other mothers ... Fundamentally, taking steps to further involve patients in the management of their own health care records will increase the perception of transparency in the clinician/patient relationship and maintain trust...

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Báo cáo lâm nghiệp: "Field trials of potential attractants and inhibitors for pine shoot beetles in the Yunnan province, China" pps

Ngày tải lên : 08/08/2014, 00:21

... researchers identify and ascertain which species were involved in the aggressive tree-killing behavior observed in the Yunnan province [13, 25, 26] The objectives of this study were to test the attractiveness ... primarily is responsible for the tree mortality observed in the Yunnan province The monoterpene blends tested in this study would not be useful for monitoring Tomicus populations in the Yunnan province, ... formed the base of the bundle with the third log on top One end of the bottom logs was placed on another short log to raise the ends and to increase available surface area for attack The ends of the...

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Ceftriaxone-induced up-regulation of cortical and striatal GLT1 in the R6/2 model of Huntington’s disease pps

Ngày tải lên : 10/08/2014, 05:21

... ceftriaxone is capable of overcoming a deficit in GLT1 function It is interesting in this regard that palmitoylation, a process by which proteins are inserted into cellular membranes [20], is reduced in ... levels begin to decline when these mice are 13 weeks of age and severely symptomatic Thus, it appears that the cellular machinery underlying the ceftriaxoneinduced increase in GLT1 expression is operative ... Although the mechanism by which ceftriaxone increases GLT1 expression is not clear, there is support for activation of nuclear factor-kappa B (NF-kB), a transcription factor that plays a role in regulating...

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báo cáo khoa học: " Can learning organizations survive in the newer NHS?" pps

Ngày tải lên : 11/08/2014, 05:22

... crucial distinction is important to make in the light of the marketisation of the NHS We return to this point later, but here we note that since 1998 it has become increasingly simplistic to assume ... there is 'learning about learning' This entails people in learning organisations taking stock, not just of the content of organisational lessons but the process by which this learning took place ... organisational shifts and risks attending the development of a learning organisation This emphasis on strong decisive decision-making at the top is thus one brand of leadership, culturally reinforced...

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BÀI LUẬN TIẾNG ANH HAY how i can stop wasting things in the house

Ngày tải lên : 21/08/2015, 15:19

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Trường điện từ - electromagnetic field theory

Ngày tải lên : 12/10/2012, 15:00

... >> (2.74) bỏ qua vô bé ta có I m lk I l sin θ sin ( ωt − kr ) = − m sin θ sin ( ωt − kr ) 4πr 2λr I lk I l µµ0 Eθ = m sin θ sin ( ωt − kr ) = − m sin θ sin ( ωt − kr ) 4πωεε0 r 2λr εε0 Hϕ = (2.76) ... r 1 R  R ≈ 1 + sin θ cos ϕ = + sin θ cos ϕ r r  r r 1− ≈ Và e −ikr′ ≈ e −ik ( r −R sin θcos ϕ) = e −ikr e ikR sin θcos ϕ = = e −ikr ( cos( kR sin θcos ϕ) + i sin ( kR sin θcos ϕ) ) Khi λ ... sát trường đến gốc to độ S = ab diện tích yếu tố mặt 49 (2.105) (2.106) Các thành phần vector hệ to độ cầu hệ to độ Decac liên hệ với sau A r = A x sin θ cos ϕ + A y sin θ sin ϕ + A z cos θ...

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TRƯỜNG ĐIỆN TỪ - ELECTROMAGNETIC FIELD THEORY - chương 2

Ngày tải lên : 17/10/2013, 17:15

... vector cường độ điện trường xoáy dọc theo đường cong kín giá trị tuyệt đối trái dấu với tốc độ biến thiên theo thời gian từ thông gửi qua diện tích giới hạn đường cong kín Theo giải tích vector ... (1.11) 1.1.4 Vector cường độ từ trường • Để đơn giản tính to n môi trường khác nhau, người ta sử dụng r vector cường độ từ trường H r r B H= μμ (1.12) 1.2 Định luật Ohm định luật bảo to n điện tích ... 4πεε V r ES = (1.6) (1.7) 1.1.2 Vector điện cảm • Để đơn giản tính to n môi trường khác nhau, người ta sử dụng r vector điện cảm D r r D = εε E (1.8) 1.1.3 Vector từ cảm • Từ trường đặc trưng tác...

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TRƯỜNG ĐIỆN TỪ - ELECTROMAGNETIC FIELD THEORY - chương 3

Ngày tải lên : 20/10/2013, 05:15

... (3.44) cho z = ta có: • • E1mx eik y sin ϕ + E′1mx e • H1my e t ik1y sin ϕt • ik1y sin ϕpx − H′1my e ik1y sin ϕpx • = E mx eik y sin ψ • = H my e (3.45) ik y sin ψ (3.45) thoả mãn ∀y ta lại có: ... tượng phản xạ to n phần Góc ϕ0 gọi góc giới hạn xác định theo công thức: ϕ0 = arcsin n2 n1 (3.64) Hiện tượng phản xạ to n phần ứng dụng để truyền ánh sáng sợi quang 3.5.5 Sự khúc xạ to n phần Nếu ... = E mx • (3.46) H1my − H′1my = H my eik y sin ϕ = e t ik1y sin ϕpx = eik y sin ψ Từ biểu thức cuối (3.46) suy ra: ϕ t = ϕ px (3.47) k1 sin ϕt = k sin ψ (3.48) Nhận xét: (3.47) mô tả định luật...

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TRƯỜNG ĐIỆN TỪ - ELECTROMAGNETIC FIELD THEORY - chương 4

Ngày tải lên : 20/10/2013, 05:15

... bỏ qua vô bé bậc λ ta có kr I m lk I l sin θ sin (ωt − kr ) = − m sin θ sin (ωt − kr ) 2λ r 4πr I lk I l μμ0 Eθ = m sin θ sin (ωt − kr ) = − m sin θ sin (ωt − kr ) 4πωεε0 r 2λr εε Hϕ = (2.76) ... to độ S = ab diện tích yếu tố mặt Các thành phần vector hệ to độ cầu hệ to độ Decac liên hệ với sau A r = A x sin θ cos ϕ + A y sin θ sin ϕ + A z cos θ A θ = A x cos θ cos ϕ + A y cos θ sin ... 1⎛ R ⎞ R ≈ ⎜1 + sin θ cos ϕ ⎟ = + sin θ cos ϕ r⎝ r ⎠ r r Và e − ikr′ ≈ e − ik ( r −R sin θ cos ϕ ) = e − ikr e ikR sin θ cos ϕ = = e −ikr (cos(kR sin θ cos ϕ ) + i sin (kR sin θ cos ϕ )) Khi...

30
501
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TRƯỜNG ĐIỆN TỪ - ELECTROMAGNETIC FIELD THEORY - chương 5

Ngày tải lên : 24/10/2013, 04:15

... φ (4.44) Chuyển sang hệ to độ cầu ta có: x = r sin θ cos ϕ y = r sin θ sin ϕ r r r r i = r0 sin θ cos ϕ + θ cos θ cos ϕ − ϕ sin ϕ r r r r j = r0 sin θ sin ϕ + θ cos θ sin ϕ − ϕ cos ϕ Khi đó: ... θ sin ϕ − ϕ cos ϕ Khi đó: 14 (4.45) ⎛ ka ⎞ ⎛ kb ⎞ sin ⎜ sin θ cos ϕ ⎟ sin ⎜ sin θ sin ϕ ⎟ e ⎝ 2R ⎠ ⎝ 2R ⎠ φ = ab ka kb R sin θ cos ϕ sin θ sin ϕ 2R 2R − ikR x ϕ y (4.46) M r θ S0 b a x y z e ... dòng điện mặt IS dòng từ mặt ISM chạy mặt S Sự phụ thuộc dòng r r điện mặt dòng từ mặt vào E H sau: 10 ( ) r r r IS = n × H out S r r r ISM = − n × E out ( ) (4.31) S r Trong đó: n vector đơn vị...

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Tài liệu FIELD INTENSITY and POWER DENSITY doc

Ngày tải lên : 12/12/2013, 09:15

... Numbers in table rounded off 4-1.2 FIELD STRENGTH APPROACH To account for the impedance difference, the antenna factor (AF) is defined as: AF=E/V, where E is field intensity which can be expressed in ... taking 377 ohms into account and V is measured voltage which can be expressed in terms taking 50 ohms into account Details are provided in Section 4-12 POWER DENSITY APPROACH To account for the ... coaxial cable to a receiving antenna Conversion Between Field Intensity (Table 1) and Power Received (Table 2) Power received (watts or milliwatts) can be expressed in terms of field intensity (volts/meter...

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Tài liệu TRƯỜNG ĐIỆN TỪ - ELECTROMAGNETIC FIELD THEORY - chương 1 pptx

Ngày tải lên : 26/01/2014, 02:20

... sin y ) Hàm mũ hàm tuần hoàn có chu kì 2πi Thực vậy, ta có e kπi = cos 2kπ + i sin 2kπ = Suy e z + kπi = e z e kπi = e z Công thức Euler eiy = cosy +isiny Khi số phức z = r eiϕ = r(cosϕ +isinϕ) ... (16) Theo công thức Euler ta có e iβx = cos β x + i sin β x e −iβx = cos β x − i sin β x (17) Suy • y1 = e αx eiβx = e αx (cos βx + i sin βx ) • y2 = e e • αx − iβ x =e αx (cos βx − i sin βx ... sin βx 2i nghiệm phương trình vi phân (7) độc lập từ trường (19) y1 = tgβx ≠ const y2 (20) Do nghiệm tổng quát phương trình vi phân (7) y = C1eαx cos βx + C eαx sin βx = e αx (C1 cos βx + C sin...

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Báo cáo khoa học: Ferrous Campylobacter jejuni truncated hemoglobin P displays an extremely high reactivity for cyanide – a comparative study ppt

Ngày tải lên : 16/03/2014, 06:20

... Although the gating role of HisE7 in the modulation of ligand access into and out of the heme pocket is openly debated [16,17], this mechanism is in keeping with the absence of a protein matrix ... binding to Camplylobacter jejuni trHbP A Bolli et al comprises single-domain globins homologous to the globin domain of ﬂavoHbs In contrast to ﬂavoHbs, they are devoid of the reductase domain ... the protonation of the outgoing cyanide anion [18] This interpretation is in agreement with the very slow kinetics of cyanide binding to Glycera dibranchiata monomeric HbC(III), whose heme distal...

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Electromagnetic field theory - bo thide

Ngày tải lên : 17/03/2014, 13:45

... distance: Faraday saw a medium where they saw nothing but distance: Faraday sought the seat of the phenomena in real actions going on in the medium, they were satised that they had found it in ... component of the eld If the current is caused by an applied electric eld E(t, x), this electric eld will exert work on the charges in the medium and, unless the medium is superconducting, there will ... at the Swedish Institute of Space Physics, Uppsala Division, and who have participated in the teaching and commented on the material covered in the course and in this book Thanks are also due to...

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selfridge, arnold, warnick. teaching electromagnetic field theory using differential forms

Ngày tải lên : 24/04/2014, 16:51

... encoded in the type of form used to represent it, rather than in the type of operator used to take its derivative The generalized Stokes theorem gives the vector Stokes theorem and the divergence theorem ... Laws in Point Form In this section we introduce the exterior derivative and the generalized Stokes theorem and use these to express Maxwell's laws in point form The exterior derivative is a single ... : Solving for D0 and substituting into (15), D = Q r d r sin d C r (16) Q D = sin d d C: (17) for the electric ux density due to the point charge This can also be written Since is the total amount...

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Charged particle in a electromagnetic field 2

Ngày tải lên : 24/05/2014, 19:10

... Keeping in mind that this component is expressed in terms of the vector potential A as Bz = ∂Ay ∂Ax − , ∂x ∂y (32) we can choose the potentials in the form A = (0, Bx, 0), ϕ = (33) With this choice, ... (28) If A and ϕ are independent of t, then L does not depend on t explicitly and the energy function is constant, that is T + qϕ = const (29) Since the second term in this equation is nothing ... (43) Then Integrating this equation yields y = −a sin(ωt + δ) + y0 (44) Finally, combining Eqs (42) and (44) we obtain (x − x0 )2 + (y − y0 )2 = a2 (45) Together with Eq (37) for z-component, this...

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Charged particle in a electromagnetic field 3

Ngày tải lên : 24/05/2014, 19:10

... , following the prescription to replace the canonical momentum h in the classical theory by −i¯ to preserve the canonical commutation h relations [x, p] = i¯ To convince yourself this is really ... not yet worked out corresponding formalism for Lagrangian– we’ll use diﬀerent principle to derive Hamiltonian, which will turn out to be exactly (9) Note we will be interpreting the canonical momentum ... we want Hamiltonian itself, which is observable, to be invariant wrt such transformations in the sense of Eq ?? Since potential energy is qφ, might guess H = p2/2m + eφ, but this is obviously...

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Lagrangian of charged particle in electromagnetic field

Ngày tải lên : 24/05/2014, 19:12

... A.i = −q x & & & ∂& dt ∂x dt 2x3 ∂& dt ∂x dt  ∂x {x ÷ dt dt =0 =0   u không phụ thuộc tường minh vào u r r & x ∂ ( qϕ ) ∂A ϕ; A = 0; =0 & & ∂x ∂x Vậy, ru r dA x d ∂ −q = qϕ − qv.A & dt dt ∂x...

2
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maxwell jc - a dynamic theory of the electromagnetic field

Ngày tải lên : 04/06/2014, 12:44

... the work done in overcoming the time This into heat is converted into heat (9) resistance of the circuits in unit of The remaining terms represent work not converted They may be written Intrinsic ... greater than that which the battery can maintain in the two wires and may be R This and r, sufficient to ignite the thin wire r contact is broken by separating the wires in given by the interposed is ... reduced to the driving-point The unbalanced force acting on the driving-point increases this momentum, and is measured by the rate of its increase tional In the case of electric currents, the resistance...

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