-
We obtained the energy transport velocity distribution for a three dimensional ideal cloak
explicitly. Near the operation frequency, the energy transport velocity has rather peculiar
distribution. The velocity along a line joining the origin of the cloak is a constant, while
the velocity approaches zero at the inner boundary of the cloak. A ray pointing right into
the origin of the cloak will experience abrupt changes of velocities when it impinges on the
inner surface of the cloak. This peculiar distribution causes long time delays for beams
passing through the ideal cloak within a geometric optics description.
標簽：
distribution
dimensional
transport
obtained
上傳時間：
2013-12-19
上傳用戶：zhliu007
-
擇PCB板材必須在滿足設(shè)計需求和可量產(chǎn)性及成本中間取得平衡點。設(shè)計需求包含電氣和機構(gòu)這兩部分。通常在設(shè)計非常高速的PCB板子(大于GHz的頻率)時這材質(zhì)問題會比較重要。例如，現(xiàn)在常用的FR-4材質(zhì)，在幾個GHz的頻率時的介質(zhì)損(dielectric loss)會對信號衰減有很大的影響，可能就不合用。就電氣而言，要注意介電常數(shù)(dielectric constant)和介質(zhì)損在所設(shè)計的頻率是否合用。
標簽：
PCB
GHz
設(shè)計需求
板材
上傳時間：
2017-04-29
上傳用戶：VRMMO
-
Traveling Salesperson Problem
Our branch-and-strategy splits a branch and bound solution into two groups:
one group including a particular arc and the other excluding this arc.
1.Each splitting incurs a lower bound and we shall traverse the searching tree with the "lower" lower bound.
2.If a constant subtracted from any row
or any column of the cost matrix, an
optimal solution does not change.
標簽：
branch-and-strategy
Salesperson
Traveling
solution
上傳時間：
2013-12-29
上傳用戶：璇珠官人
-
1. Download the version you want:
* Version 1.3.4 (30 Aug 2007) -- this is the latest version for UNIX/Linux and Windows
* Previous versions
2. Unzip the file, which will create a directory called klt and place all the files there
3. Compile and run the code
* On UNIX / Linux, move to the klt directory, type make. Now try some examples, by typing example1, etc.
* For Microsoft Visual C++ 6.0, open the klt.dsw file, compile, and run. Change the constant in main.cpp to run the different examples.
* For Microsoft Visual Studio .Net/7/8, open the klt.sln file, compile, and run. Change the constant in main.cpp to run the different examples.
4. Notice that, for your convenience, unofficial copies of the User and Reference Manuals can be found in the doc directory.
標簽：
the
Download
Version
version
上傳時間：
2014-01-25
上傳用戶：nanshan
-
RS_latch using vhdl,
When using static gates as building blocks, the most fundamental latch is the simple SR latch, where S and R stand for set and reset. It can be constructed from a pair of cross-coupled NOR (Not OR) logic gates. The stored bit is present on the output marked Q.
Normally, in storage mode, the S and R inputs are both low, and feedback maintains the Q and Q outputs in a constant state, with Q the complement of Q. If S (Set) is pulsed high while R is held low, then the Q output is forced high, and stays high when S returns to low similarly, if R (Reset) is pulsed high while S is held low, then the Q output is forced low, and stays low when R returns to low.
標簽：
using
fundamental
the
RS_latch
上傳時間：
2017-07-30
上傳用戶：努力努力再努力
-
When trying to extract information from SAR images, we need to distinguish
two types of image property. The more important is where properties of the
scene (e.g., its dielectric constant, its geometry, its motion, etc.) produce effects
in the image measurements or examination of the image then can provide
information about the scene. The second is generated purely by the system
and the signal processing.
標簽：
distinguish
information
extract
trying
上傳時間：
2014-01-09
上傳用戶：huyiming139
-
The AP2406 is a 1.5Mhz constant frequency, slope compensated current mode PWM step-down converter. The device integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. It is ideal for powering portable equipment that runs from a single cell lithium-Ion (Li+) battery. The AP2406 can supply 600mA of load current from a 2.5V to 5.5V input voltage. The output voltage can be regulated as low as 0.6V. The AP2406 can also run at 100% duty cycle for low dropout operation, extending battery life in portable system. Idle mode operation at light loads provides very low output ripple voltage for noise sensitive applications.
The AP2406 is offered in a low profile (1mm) 5-pin, thin SOT package, and is available in an adjustable version and fixed output voltage of 1.2V, 1.5V and 1.8V
標簽：
2406
AP
技術(shù)手冊
上傳時間：
2017-02-23
上傳用戶：w124141
-
DESCRIPTION
The Texas Instruments MSP430 family of ultra-low-power microcontrollers consists of several devices featuring
different sets of peripherals targeted for various applications. The architecture, combined with five low-power
modes, is optimized to achieve extended battery life in portable measurement applications. The device features a
powerful 16-bit RISC CPU, 16-bit registers, and constant generators that contribute to maximum code efficiency.
The digitally controlled oscillator (DCO) allows wake-up from low-power modes to active mode in less than 1 μs.
The MSP430G2x13 and MSP430G2x53 series are ultra-low-power mixed signal microcontrollers with built-in 16-
bit timers, up to 24 I/O capacitive-touch enabled pins, a versatile analog comparator, and built-in communication
capability using the universal serial communication interface. In addition the MSP430G2x53 family members
have a 10-bit analog-to-digital (A/D) converter. For configuration details see Table 1.
Typical applications include low-cost sensor systems that capture analog signals, convert them to digital values,
and then process the data for display or for transmission to a host system.
標簽：
G2553
2553
430G
MSP
430
上傳時間：
2018-12-25
上傳用戶：ygyh
-
The current methods of communications are becoming less relevant under
today’s growing demand for and reliance on constant connectivity. Of
decreasing relevance are the models of a single radio to perform a single
task. The expansion of wireless access points among coffee shops, airports,
malls, and other public arenas is opening up opportunities for new services
and applications.
標簽：
Intelligence
Artificial
上傳時間：
2020-05-26
上傳用戶：shancjb
-
Mobile wireless communications are in constant evolution due to the continu-
ously increasing requirements and expectations of both users and operators.
Mass multimedia* services have been for a long time expected to generate a large
amount of data traffic in future wireless networks [1]. Mass multimedia services
are, by definition, purposed for many people. In general, it can be distinguished
between the distribution of any popular content over a wide area and the distribu-
tion of location-dependent information in highly populated areas. Representative
examples include the delivery of live video streaming content (like sports compe-
titions, concerts, or news) and file download (multimedia clips, digital newspa-
pers, or software updates).
標簽：
Broadcasting
Generation
Mobile
Next
上傳時間：
2020-05-31
上傳用戶：shancjb
