cách sử dụng lò vi sóng sanyo emg205aw s
Sử dụng lò vi sóng
Ngày tải lên :
17/09/2013, 20:10
... - 10:06 AM
Lò nấu vi s ng
Lò Vi s ng (Microwave oven - s ng cực ngắn) hiện nay đã ngự trị trong bếp của nhiều gia
đình cũng như tại công s , trường học…. Dân giầu có thì s m một lò gắn vào tường ... cũng như cách dùng lò sao cho hiệu
quả và đúng hướng dẫn.
Lịch s lò vi s ng
Nhiều phát minh khoa học là kết quả của nhận xét tình cờ. Kháng
sinh Penicillin được tìm ra khi nhà vi trùng học ... lò vi s ng hiện nay rất an toàn cho người
mang máy điều hòa nhịp tim (pacemaker) vì các y cụ này đều được
che chở chống phóng xạ hoặc vi s ng.
© Copyright 2000-2003 Vinacomm, all rights reserved....
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Tài liệu Một số vấn đề về lò vi sóng và sử dụng lò vi sóng pptx
Ngày tải lên :
20/01/2014, 07:20
... thức nấu ăn cho lò vi s ng đợc vi t dùng cho lò có công suất
1000 W. Các chỉ dẫn công thức nấu món ăn trong lò vi s ng s khác tuỳ theo
công suất của lò. Bảng dới đây chỉ ra s chuyển đổi thời ... đá, s và một s đồ nhựa (theo chỉ dẫn của nhà s n xuất) có thể s dụng
trong lò vi s ng.
HÃy để lót tay ở chỗ thuận tiện. Mặc dù những đồ đựng an toàn với s ng vi
ba, không bị năng lợng vi ba ... chịu đợc s c nóng của thức ăn nh đồ dùng
thuỷ tinh chạm khắc, đĩa mêlamin. Vật liệu lý tởng cho nấu ăn trong lò vi
s ng là vật liệu trong suốt đối với s ng vi ba. Nó phải cho phép s ng vi ba
xuyên...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P1)
Ngày tải lên :
24/10/2013, 16:15
... applications.
The study starts with a brief discussion of typical HTS subsystems and RF modules
that include HTS microstrip filters for cellular base stations. This is followed by
more detailed descriptions ... including selec-
tive filters with a single pair of transmission zeros, cascaded quadruplet (CQ) fil-
ters, trisection and cascaded trisection (CT) filters, cross-coupled filters using
transmission ... 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 filters. This chapter discusses computer...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P2)
Ngày tải lên :
24/10/2013, 16:15
... cascade connection of two or more simpler networks appears to be used
most frequently in analysis and design of filters. This is because most filters consist
of cascaded two-port components. ... ANAYLSIS
2.9 SYMMETRICAL NETWORK ANALYSIS
19
TABLE 2.1 (a) S parameters in terms of ABCD, Y, and Z parameters
ABCD Y Z
S
11
S
12
S
21
S
22
(b) ABCD parameters in terms of S, Y, and Z parameters
SY ... such that
[S]
t
= [S] (2.49)
where the superscript t denotes the transpose of matrix. For a lossless passive net-
work,
[S]
t
[S] * = [U] (2.50)
where the superscript * denotes the conjugate of...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P3)
Ngày tải lên :
28/10/2013, 23:15
... type of specification.
3.2.4 Gaussian Lowpass Prototype Filters
The filter networks shown in Figure 3.10 can also serve as the Gaussian lowpass
prototype filters, since the Gaussian filters are ... network is a mathematical description of
network response characteristics, namely, a mathematical expression of S
21
. On
many occasions, an amplitude-squared transfer function for a lossless passive ... Chebyshev lowpass response using the Richards’ transformation.
3.1.6 Gaussian (Maximally Flat Group-Delay) Response
The Gaussian response is approximated by a rational transfer function [4]
S
21
(p)...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P4)
Ngày tải lên :
28/10/2013, 23:15
... Microstrip Losses
The loss components of a single microstrip line include conductor loss, dielectric
loss and radiation loss, while the magnetic loss plays a role only for magnetic sub-
strates such ... A(h /s) tanh( 8s/ h)
86
TRANSMISSION LINES AND COMPONENTS
4.1.8 Dispersion in Microstrip
Generally speaking, there is dispersion in microstrips; namely, its phase velocity is
not a constant but depends on frequency. ... in Chapter 7. Strictly speaking, the simple expression of
(4.18) is only valid for large strip widths because it assumes that the current distrib-
ution across the microstrip is uniform, and...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P5)
Ngày tải lên :
07/11/2013, 21:15
... of Lowpass Filters Using Open-Circuited Stubs
The previous stepped-impedance lowpass filter realizes the shunt capacitors of the
lowpass prototype as low impedance lines in the transmission path. ... the substrate for the
previous design example of stepped-impedance microstrip lowpass filter is em-
ployed. Also, the same high-impedance (Z
0L
= 93 ohms) lines are used for the series
inductors, ... impedances with
a fixed line width. To make such a filter design possible, a technique is presented
here with demonstration of a filter design.
For this demonstration, the design uses the same lowpass...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P6)
Ngày tải lên :
07/11/2013, 21:15
... transmission-line elements. Since any commensurate
network exhibits periodic frequency response, the wide-band bandpass stub filters
discussed in Chapter 5 may be used as pseudohighpass filters ... the susceptance slope parameters of series parallel resonators.
It is obvious that for a chosen lowpass prototype, with known element values, the
desired reactance/susceptance slope parameters ... Chebyshev lowpass prototype with a passband ripple of 0.1 dB
is chosen for design a microstrip bandstop filter, as shown in Figure 6.8. The mi-
crostrip bandstop filter uses L-shaped resonators coupled...
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Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P7)
Ngày tải lên :
07/11/2013, 21:15
... MMICs because of its suitability for both high-frequency transistors
and low loss-passive components. Metallic strips deposited on grounded Si or GaAs
substrates are also microstrips. The Si substrate ... fil-
ters are simply microstrip structures using HTS thin films [18–44]. For the design
of HTS microstrip filters, it is essential to understand some important properties of
superconductors and substrates ... match the dimensions of the lattices of the superconductors. If this is not the
case, strain can be set up in the films, producing dislocations and defects. In some
cases, the substrates can react...
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Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P8) doc
Ngày tải lên :
15/12/2013, 06:15
... same signs, if
not the opposite signs. For instance, the electric and magnetic couplings discussed
in Section 8.2.1 are said to have the opposite signs of their coupling coefficients.
This is ... obtain
S
11
= (8.76)
Since we have assumed that the 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 ... orientations of a pair of
open-loop resonators, which are separated by a spacing s. It is obvious that any
coupling in those structures is proximity coupling, which is, basically, through
fringe fields....
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Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P9) doc
Ngày tải lên :
15/12/2013, 06:15
... design
with less design iterations, leading to first-pass or tuneless filters. This not only re-
duces the labor intensiveness and so the cost, but also shortens the time from design
to production. ... filter structure
into subsections or cells with 2D or 3D meshing, and then solve Maxwell s equa-
tions upon these cells. Larger cells yields faster simulations, but at the expense of
larger errors. ...
REFERENCES
313
tention of this chapter is to discuss some basic concepts, methods, and issues re-
garding filter design by CAD. Typical examples of the applications will be de-
scribed. As a matter...
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Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P10) pptx
Ngày tải lên :
15/12/2013, 06:15
... filters show asymmetric frequency responses with one or two finite fre-
quency attenuation poles on the either side of the passband. This is because the
transmission line inserted inverters resonate ... FILTERS WITH TRANSMISSION LINE INSERTED
INVERTERS
10.41 Characteristics of Transmission Line Inserted Inverters
An ideal immittance inverter has a constant 90° phase shift. To obtain other phase
characteristics, ... Levy s approximate synthesis
approach [2], described in Section 10.1, may be used. However, in this case, the
cross coupling J
m–1
will have the same sign as J
m
for a single pair of transmission
zeros...
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Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P11) ppt
Ngày tải lên :
15/12/2013, 06:15
... or bandstop filter may be used to sup-
press the spurious passband at a cost of extra insertion loss and size. Although quar-
ter-wavelength resonator filters have the first spurious passband ... they suffer from higher loss and poorer power handling
capability. Bandpass filters using stepped impedance resonators [14], or slow-wave
resonators such as end-coupled slow-wave resonators [15] ... must
pay attention to some design considerations:
ț Low-loss filters need a sufficient line width. This limit is associated with the
necessity of using low-value characteristic impedance lines
ț...
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Tài liệu Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P12) pptx
Ngày tải lên :
15/12/2013, 06:15
... sensitivity and selectivity:
ț Sensitivity—The benefits of increasing sensitivity in rural areas is obvious
since the number of mobile base stations and thus the investment necessary to
secure the ... errors. Among several possible error sources we have
identified that the thickness of the substrates used is a main source. The tolerance of
substrate thickness is ±5%. This tolerance is not ... the duplexers and preselect bandpass filters
are made using HTS thin film microstrip components. The use of the HTS compo-
nents enables increases in both the sensitivity and selectivity due to...
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