... đựng thực phẩm antoàn trong lòvi ba. Muốn trắc nghiệm an toàn, đặt đồ đựng trong lò với một ly nước lạnh. Vặn lò với nhiệt độ cao trong một phút. Nếu đồ đựng không nóng là an toàn; mà đồ đựng ... lò sao cho hiệu quả và đúng hướng dẫn. Lịch sửlòvisóng Nhiều phát minh khoa học là kết quả của nhận xét tình cờ. Kháng sinh Penicillin được tìm ra khi nhà vi trùng học người Anh Alexander ... - 10:06 AM Lò nấu visóng Lò Visóng (Microwave oven - sóng cực ngắn) hiện nay đã ngự trị trong bếp của nhiều gia đình cũng như tại công sở, trường học…. Dân giầu có thì sắm một lò gắn vào tường...
... và phạm vi điều chỉnh- Phạm vi áp dụng: Quy chế này quy định về vi c quản lý, vận hành, sửdụng và đảm bảo antoàn thông tin trên trang webs chuyên dùng trên địa bàn.- Đối tượng áp dụng: Các ... thác, sửdụng tuân thủ theo các quy định về đảm bảo an toàn, an ninh thông tin, về tiêu chuẩn, quy chuẩn kỹ thuật đuợc nhà nước quy định.5. Các hành vivi phạm gây ảnh hưởng đến antoàn mạng trang ... theo nhu cầu khai thác sửdụng của đơn vị.QUY CHẾQUẢN LÝ, VẬN HÀNH, SỬDỤNG VÀ ĐẢM BẢO ANTOÀN THÔNG TIN TRÊN TRANG WEBS CHUYÊN DÙNG TRONG CÁC KHOA, PHÒNG VÀ TRẠM Y TẾ (Ban hành kèm theo Quyết...
... những yếu tố liên quan đến môn Toán Sử dụng các chức năng của Máy chiếu đa năng, những lu ý khi sửdụng máy chiếu trong dạy học.III. Phạm vi chuyên đề:Chuyên đề nghiên cứu sửdụng phần mềm Power ... trao đổi của quý thầy cô về vấn đề này để vi c sửdụng Power Point có hiệu quả hơn. Xin trân trọng cảm ơnNgời vi tNguyễn Văn mạnh Chuyên đê: Sửdụng phần mềm PowerPoint soạn, giảng Đại số ... thời gian tìm tòi học hỏi mới có thể sửdụng đợc một cách hiệu quả.II. Mục đích nghiên cứu: Tìm hiểu những tính năng của phần mềm Power Point, Khai thác sửdụng các tính năng này vào vi c soạn,...
... 4INTRODUCTIONprototype filters and elements, frequency and element transformations, immittance(impedance/admittance) inverters, Richards’ transformation, and Kuroda identitiesfor distributed ... include those for design, fabrication, testing,and tuning. Here the costs for the design and tuning can be reduced greatly by usingCAD, which can provide more accurate design with less design iterations, ... res-onator circuits. These are of importance for design of RF/microwave filters, in par-ticular the narrow-band bandpass filters, which play a significant role in many ap-plications. There is a general...
... terms of the terminal impedance Z01and the so-called input imped-ance Zin1= V1/I1, which is the impedance looking into port 1 of the network. Such an expression can be deduced by evaluating ... in Figure 2.1, where V1, V2and I1, I2are the voltage and currentvariables at the ports 1 and 2, respectively, Z01and Z02are the terminal impedances,and Esis the source or generator ... not relevant in deter-mining duality by use of the above definition. All that required is dual behavior atthe specified terminal pairs. In accordance with this definition, an inductance of xhenries...
... radians and ⍀ is in radians per second.3.1.2 The Poles and Zeros on the Complex PlaneThe (, ⍀) plane, where a rational transfer function is defined, is called the complexplane or the p-plane. ... (midband) frequency of bandstop filters, and FBW is the fractional band-width as defined in (3.43). As an example, let us suppose that a bandstop filter isdesigned with a fractional stop band bandwidth ... between lumpedinductors and capacitors in the p-plane and short- and open-circuited transmissionlines in the t-plane. As a one-port inductive element with an impedance Z = pL, alumped inductor...
... DISCONTINUITIES AND COMPONENTS894.2.2 Even- and Odd-Mode Characteristic Impedances and EffectiveDielectric ConstantsThe even- and odd-mode characteristic impedances Zceand Zcocan be obtainedfrom ... resonators can be analyzed as waveguide cavities with mag-netic walls on the sides. The fields within the cavities can be expanded by theTMZnm0modes, where z is perpendicular to the ground plane. ... admittance of an open-cir-cuited transmission line having a characteristic admittance Yc= 1/Zcand propaga-tion constant = 2/gis give byYin= jYctanl(4.55)where l is the...
... these twobranches have no effect, and the inductances L1, L3, and L5block transmission byhaving infinite series reactance, whereas the capacitance C6shorts out transmissionby having infinite ... 0.03525uation poles can be made to occur at frequencies other than f0/2 and 3f0/2. This typeof filter will have additional passbands in the vicinity of f = 0 and f = 2f0, and at oth-er corresponding ... 1–2[tan–1(2 × 0.2157) + tan–1(2 × 0.0405)] = 2.8976 radians(5.18)2= – 1–2[tan–1(2 × 0.0405) + tan–1(2 × 0.0405)] = 3.0608 radiansUsing (5.15) we obtain the coupling capacitancesCg0,1=...
... in Figure 6.7, where Z0and Y0denote the terminating impedance and ad-mittance, ZUand YUare the characteristic impedance and admittance of immittanceinverters, and all the circuit parameters ... relative dielectric constant of 10.8 and a thickness of 1.27mm. The bandstop filter is designed to provide an RF rejection better than 40 dBover an operating frequency band from 3.5 GHz to 5.5 ... substitu-tion, we can obtain from (6.12)|S21| = (6.14)This is at resonance when = 0or ⌬= 0, |S21| = 0 because the resonant shuntbranch shorts out the transmission and causes an attenuation...
... [56] G. Subramanyam, F. A. Miranda, R. Romanofsky, F. W. Van Keuls, C. L. Canedy, S.Aggarwal, T. Venkatesan, and R. Ramesh, “A ferroelectric tunable microstrip Langecoupler for K-band application,” ... high-frequency performance and enable new systemcapabilities. For a general definition, a MEMS is a miniature device or an array ofdevices combining electrical and mechanical components and fabricated ... F. A. Miranda, G. Subramanyam, F. W. Van Keuls, R. R. Romanofsky, J. D. Warner,and C. H. Mueller, “Design and development of ferroelectric tunable microwave com-ponents for Ku- and K-band satellite...
... 8.4(a), where L and C are the self-inductance and self-capacitance, so that (LC)–1/2equals the angular resonant frequency of uncoupledresonators, and Cmrepresents the mutual capacitance. As mentioned ... is an equivalent lumped-element circuit model for magneti-cally coupled resonator structures, where L and C are the self-inductance and self-capacitance, and Lmrepresents the mutual inductance. ... (8.67)For narrow-band applications we can assume that (L1C1+ L2C2) ӷ LmCmand Ϸ 1The latter actually represents a ratio of an arithmetic mean to a geometric mean oftwo resonant frequencies....
... optimizers)Ansoft Ansoft HFSS 3D EM simulationEnsemble Planar EM simulatorHarmonica Linear and nonlinear simulationZeland Software IE3D Planar and 3D EM simulation andOptimization packageJansen ... J. Zhang, and M. Nakhla, “Analysis and optimization of microwave cir-cuits and devices using neural network models.” IEEE MTT-S, Digest, 1994, 393–396. [30] A. H. Zaabab, Q. J. Zhang, and M. ... training an ANN configuration based on a particular ANN architecture using the data from EMsimulations. Figure 9.8(b) illustrates a typical ANN architecture, consisting of an input layer, an output...
... right-half plane transmission zeros on the complex frequency plane.Hence, physically, a linear phase filter network must have more than one path oftransmission, and mathematically its transfer function ... we can find the correspond-ing attenuation pole at the bandpass frequencyfa= f0(10.21)Here f0is the midband frequency and FBW is the fractional bandwidth of bandpassfilters.To transfer ... design example, the resonant frequency of resonators 1and 3 is higher than the midband frequency, whereas the resonant frequency of res-onator 2 is lower than the midband frequency. The frequency...
... eigenequations can further be expressed asa0= 2 tan–1(11.9a)a1= 2– 2 tan–1(f1ZaCL) (11.9b)from which the fundamental resonant frequency f0and the first spurious resonantfrequency ... sen-sitive receiver, a wider upper stopband, including 2f0, where f0is the midband fre-quency of a bandpass filter, may also be required. However, many planar bandpassfilters that are comprised ... CONSTANT SUBSTRATESUsing high dielectric constant substrates is another approach to filter miniaturiza-tion [54–63]. High dielectric constant materials, particularly high dielectric constantand...
... H. Tanaka, and T. Itoh, “Branch-line hybrid-rings with cou-pled-lines,” 1994 European Microwave Conference, pp. 686–691[18] J. P. Shelton, J. Wolfe, and R. C. Van Wagoner, “Tandem couplers and ... ex-ternal quality factors, and resonant frequency, it is important to perform sensitivityanalysis to see the effect of the change of design parameters on filter response. Thiscan be done by employing ... performance of the duplexer in the test housing (T = 80K)Frequency 1770–1785 MHz (Rx band) 1805–1880 MHz (Tx band)Antenna receiver loss < 0.3 dBTransmitter antenna loss < 0.3 dBTransmitter...