cách sử dụng lò vi sóng sanyo dien tu

Ngày tải lên: 28/08/2013, 18:19

... - 10:06 AM Lò nấu vi sóng Lò Vi sóng (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 ... bình thường thì cũng cố mua một lò nấu vi sóng, nhỏ bé, giản dị. Bởi lẽ công dụng của nó rất tiện lợi, đặc biệt người Vi t Nam có thói ăn nóng. Nấu thực phẩm bằng lò này đã trở thành một nhu cầu ... học, lò cũng có những rủi ro, bất lợi. Xin cùng tìm hiểu thêm về bếp nấu hiện đại này. KHCN Số 4 giới thiệu cùng bạn đọc về lịch sử ra đời lò vi sóng, những ưu khuyết điểm của nó, cũng như cách...

Ngày tải lên: 17/09/2013, 20:10

... chỉ dẫn của nhà sản xuất) có thể sử dụng trong lò vi sóng. HÃy để lót tay ở chỗ thuận tiện. Mặc dù những đồ đựng an toàn với sóng vi ba, không bị năng lợng vi ba làm nóng lên nhng lại bị thức ... đông, lò vi sóng sẽ tự chọn thời gian rà đông, chế độ năng lợng phù hợp. Trang 3: Chuyển đổi công thức nấu ăn Microwave Cooking: Tất cả các công thức nấu ăn cho lò vi sóng đợc vi t dùng cho lò có ... chạm khắc, đĩa mêlamin. Vật liệu lý tởng cho nấu ăn trong lò vi sóng là vật liệu trong suốt đối với sóng vi ba. Nó phải cho phép sóng vi ba xuyên qua, làm nóng thực phẩm. Thuỷ tinh chịu nhiệt,...

Ngày tải lên: 20/01/2014, 07:20

Ngày tải lên: 07/03/2014, 17:20

Ngày tải lên: 19/06/2014, 11:20

Ngày tải lên: 07/08/2014, 08:09

... testing, and tuning. Here the costs for the design and tuning can be reduced greatly by using CAD, which can provide more accurate design with less design iterations, leading to first-pass or tuneless ... (Chapter 12) presents a case study of high-temper- ature superconducting (HTS) microstrip filters for cellular base station applications. The study starts with a brief discussion of typical HTS ... miniaturized dual-mode filters, multilayer filters, lumped-element filters, and filters using high-dielectric constant substrates. The final chapter of the book (Chapter 12) presents a case study...

Ngày tải lên: 24/10/2013, 16:15

... complex, and it is convenient to express them in terms of amplitudes and phases, i.e., S mn = |S mn |e j ␾ mn for m, n = 1, 2. Often their amplitudes are given in decibels (dB), which are defined as ... L A denotes the insertion loss between ports n and m and L R represents the re- turn loss at port n. Instead of using the return loss, the voltage standing wave ratio VSWR may be used. The definition ... of equivalence, the internal structures of the networks are not relevant in deter- mining duality by use of the above definition. All that required is dual behavior at the specified terminal pairs....

Ngày tải lên: 24/10/2013, 16:15

... open-circuited stub or a series short-circuited stub, and a unit element with a series short-circuited stub or a shunt open-circuited stub. The other two Kuroda identities, involving the ideal ... the same 3 pole Butterworth lowpass prototype as that used previously in Section 3.3.1, Figure 3.15(b) illustrates a bandpass having a passband from 1 to 2 GHz obtained using the element transformation. 3.3.4 ... realizing all-pass, lowpass prototype filters is a lattice structure, as shown in Figure 3.12(a), where there is a conventional abbreviated rep- resentation on the right. This lattice is not only...

Ngày tải lên: 28/10/2013, 23:15

... topics can be found in the open literature, they are summarized here for easy reference. 4.1 MICROSTRIP LINES 4.1.1 Microstrip Structure The general structure of a microstrip is illustrated in ... Short-Circuited Stubs. We will now demonstrate that a short open- circuited stub of lossless microstrip line can be equivalent to a shunt capacitor and that a similar short-circuited stub can be equivalent ... General microstrip structure. Y in Ϸ jY c ΂ l ΃ = j ␻ ΂΃ (4.56) where v p is the phase velocity of propagation in the stub. It is now clearer that such a short open-circuited stub is equivalent to...

Ngày tải lên: 28/10/2013, 23:15

... Semilumped Lowpass Filters Having Finite-Frequency Attenuation Poles The previous two types of microstrip lowpass filter realize the lowpass prototype filters having their frequencies of infinite ... designed in this form, their stubs will have unreasonably low impedance levels. 5.2.7.2 Filters with ␭␭ g0 /2 Open-circuited Stubs If the ␭ g0 /4 short-circuited stubs, in Figure 5.26 are replaced ... FILTERS Y 1a Y 1b Y 2a Y 2b Y n-1a Y n-1b Y 0 l 1,2 l 1a l 1b l n-1,n Y 0 Y na Y nb Y 1,2 Y n-1,n Open-circuited stub FIGURE 5.28 Transmission line bandpass filter with half-wavelength open-circuited stubs. 140 LOWPASS AND BANDPASS FILTERS 20 mm Via hole grounding Feed port 30...

Ngày tải lên: 07/11/2013, 21:15

... simultaneously to stub zЈ 3 and unit element z U2 , to stub z L2 and unit element z U1 , to stub z L1 and unit element z Ј A , to stub zЈ 5 and unit element z U6 , and to stub z L6 and unit element ... filter with three open-circuited stubs (n = 3) and a fractional bandwidth FBW = 1.0 at a midband frequency f 0 = 2.5 GHz will be designed. Assume a passband return loss of –20 dB, which corresponds ... of the short-circuited stub, namely the width W and length l, can be estimated from jZ c tan ΂ l ΃ = j ␻ c L 2 (6.4) where Z c is the characteristic impedance of the stub line, ␭ gc is its guided...

Ngày tải lên: 07/11/2013, 21:15

... improve filter selectivity. Therefore, it does not constitute a particularly attractive choice for achieving frequency selectivity. Never- theless, it may be of interest for miniaturizing wideband ... (MEMS) provide a class of new devices and com- ponents which display superior high-frequency performance and enable new system capabilities. For a general definition, a MEMS is a miniature device ... is known as the Curie temperature (T c ) at which the material properties change abruptly. Because of the nature of the crystal structure close to the Curie temperature, thermodynamic properties...

Ngày tải lên: 07/11/2013, 21:15

Ngày tải lên: 12/12/2013, 11:26

Ngày tải lên: 12/12/2013, 11:27

... again evidence that the resultant coupling coefficients have the opposite signs. 8.5.2 Extracting k (Asynchronous tuning) To demonstrate extracting coupling coefficients of asynchronously tuned, ... EXAMPLES 267 nous tuning in the given range has a very small effect on the coupling. This implies an advantage of using this type of coupled resonator structure to design asynchro- nously tuned microstrip ... resonator is lossless, the magnitude of S 11 in (8.76) is always equal to 1. This is because in the vicinity of resonance, the parallel res- onator of Figure 8.11 behavior likes an open circuit....

Ngày tải lên: 15/12/2013, 06:15

... testing, and tuning. Here the weights for the design and tuning can be reduced greatly by us- ing CAD. For instance, in addition to controlling fabrication processes, to tune or not to tune is also ... accuracy, and tuning can be very expen- sive and time costuming for mass production. CAD can provide more accurate design with less design iterations, leading to first-pass or tuneless filters. ... Asynchronously Tuned Filter by Optimization The second example of filter synthesis by optimization is a three-pole cross-cou- pled resonator filter having asymmetrical frequency selectivity. The desired...

Ngày tải lên: 15/12/2013, 06:15

... the improvement in selectivity over the Chebyshev filter is evident. The closer the atten- uation poles to the cut-off frequency (⍀ = 1), the sharper the filter skirt and the higher the selectivity. ⍀ a FBW ... filter has the same return loss level but its 50 dB and 65 rejection bandwidths are 100 MHz and 120 MHz, respectively, which obviously does not meet the rejection require- ments. Having determined ... upon (10.18) and solving for ⍀ a , we obtain ⍀ a = – ΂ + B 2 ΃ (10.19) This attenuation pole has to be outside the passband, namely |⍀ a | > 1. Because of the cascaded structure of CT filters...

Ngày tải lên: 15/12/2013, 06:15

... the 392 COMPACT FILTERS AND FILTER MINIATURIZATION ()a ()b ()c FIGURE 11.12 Structural variations to miniaturize hairpin resonator. (a) Conventional hairpin res- onator. (b) Miniaturized hairpin resonator ... structure and surface are suitable for thin film process can be selected for the specification of products ac- cording to dielectric constants, Q-factors, temperature stability, etc. For miniaturiza- tion ... performance of the filter at a temperature of 60K. 11.6 MULTILAYER FILTERS 417 FIGURE 11.31 Simulated coupling coefficient and normalized center frequency of aperture coupling structures in Figure 11.30 with...

Ngày tải lên: 15/12/2013, 06:15

... 43 dB > 35 dB Antenna port return loss > 27 dB > 26 dB Receiver port return loss > 25 dB Transmitter port return loss > 28 dB CHAPTER 12 Case Study for Mobile Communications Applications Microstrip ... high-temperature supercon- ducting (HTS) technology [1–7]. The challenges for cellular mobile base stations vary but may focus on increasing sensitivity and selectivity: ț Sensitivity—The benefits ... re- sponse did verify the design approach. 12.3.3 Sensitivity Analysis Sensitivity analysis is very important for filter design, particularly for filter tuning, mainly because of fabrication errors. Among...

Ngày tải lên: 15/12/2013, 06:15