Reconstructing non-ideal-bordered field by simple self-correlative algebraic reconstruction technique

A new algorithm for iterative reconstruction is suggested.It is named simple self-correlative algebraic reconstruction technique (SSART).With numerical simulation experiments,SSART was applied in reconstructing a non-ideal-bordered field in order to test its reconstructive effect.For contrast,three current representative algebraic reconstruction(ARTs) including basic ART,simultaneous ART (SART) and modified SART (MSART) were simulated simultaneously.The calculated results and reconstructive accuracy are discussed with three kinds of error indexes,namely mean-square error (MSE),absolute value error (AVE) and peak error (PE).As the results,the indexes of reconstructive accuracy are much improved by the proposed SSART.The MSE and PE have been decreased by 63.6% on the order of magnitude 10-4 and 88.9% on the order of magnitude 0-2,respectively,compared to that of ART.It is concluded that SSART is one of the most super iterative reconstructing techniques.

A PHEMT Based Wideband LNA for Wireless Applications

This work is about the development of a super low noise amplifier with minimum power consumption and high gain for several wireless applications.The amplifier operates at frequency bands of 0.9-2.4 GHz and can be used in many applications like Wireless local area network(WLAN),WiFi,Bluetooth,ZigBee and Global System for mobile communications(GSM).This new design can be employed for the IEEE 802.15.4 standard in industrial,scientific and medical(ISM) Band.The enhancement mode pseudomorphic high electron mobility transistor PHEMT is used here due to its high linearity,better performance and less noisy operation.The common source inductive degeneration method is employed here to enhance the gain of amplifier.The amplifier produces a gain of more than 17 dB and noise figure of about 0.5 dB.The lower values of S11 and S22 reflect the accuracy of impedance matching network placed at the input and output sides of amplifier.Agilent Advance Design System(ADS) is used for the design and simulation purpose.Further the layout of design is developed on the FR4 substrate.

Iteration compensation of inside fringe in reconstructing field with an opaque object

An algorithm is suggested to compensate the inside fringe in reconstruction field for the iterative distortion when an opaque object exists.With numerical simulation, a model field with an opaque object is reconstructed by a new algebraic reconstructing technique (ART),named Simple Self-correlative ART (SSART),which shows that the inside fringe of the reconstructed field is quite irregular with serious profile distortion.An algorithm of the compensation of the inside fringe for the iterative distortion is suggested and applied to the reconstruction of the field.It is found that the reconstructed field is quite similar to the model.With the compensation algorithm, the field with an opaque object in can be accurately reconstructed by SSART.

Study of Properties in Superconducting Nanowires

我们认为标准 GinzburgLandau 的一条简单途径免费精力为一根电线功能滑倒学习超导的 nanowires 的性质，并且分析量和热地激活的阶段的问题。在一个人能考虑的如此的系统，为阶段的可能性滑倒被创造由于不仅热而且由于一个超导的顺序参数的量变化。我们分别地获得免费能量，熵，特定的热和偏爱水流的一些表情。偏爱水流我是温度和超导的 nanowires 的长度的功能，并且让一个量阶段滑倒。我们获得在 hysteretic 的超导抵抗的切换的随机的动力学偏导水流的超导的 nanowires 经历阶段滑倒变化，并且获得交换水流的分发。我们的结果能与超导的 nanowires 在现代实验被验证。

Critical Temperature Characteristics of Layered High-Temperature Superconductor Under Pressure

我们考虑一辆 Ginzburg 四轮马车在压力下面修改了分层的高温度的超导体的模型。我们理论上学习了在压力和分层的高温度的超导体的温度之间的关系。如果压力不是一个常数，我们有在压力和分层的高温度的超导体的温度之间的二次的方程的一种关系。在一种特殊情况中，我们发现批评温度与进一步增加压力减少。在另一种特殊情况中，批评温度与进一步增加压力增加。

An Improved Empirical Mode Decomposition for Power Analysis Attack

Correlation power analysis(CPA) has become a successful attack method about crypto-graphic hardware to recover the secret keys. However, the noise influence caused by the random process interrupts(RPIs) becomes an important factor of the power analysis attack efficiency, which will cost more traces or attack time. To address the issue, an improved method about empirical mode decomposition(EMD) was proposed. Instead of restructuring the decomposed signals of intrinsic mode functions(IMFs), we extract a certain intrinsic mode function(IMF) as new feature signal for CPA attack. Meantime, a new attack assessment is proposed to compare the attack effectiveness of different methods. The experiment shows that our method has more excellent performance on CPA than others. The first and the second IMF can be chosen as two optimal feature signals in CPA. In the new method, the signals of the first IMF increase peak visibility by 64% than those of the tradition EMD method in the situation of non-noise. On the condition of different noise interference, the orders of attack efficiencies are also same. With external noise interference, the attack effect of the first IMF based on noise with 15dB is the best.

Anomalous Transport Characteristics of High Temperature Superconductors and Josephson Currents

The transport characteristics of high temperature superconductor current and Josephson current is inves-tigated in the framework of the modified time-dependent Ginzburg-Landau model and the Lawrence-Doniach model.We evaluated the vortex equation and found that the signs of the high temperature superconductor current and theJosephson current can reverse. Some explicit expressions for different cases are derived, which accord with experimentaldata.

Phase separations in graded-indium content InGaN/GaN multiple quantum wells and its function to high quantum efficiency

Phase separations have been studied for graded-indium content In_xGa_（1-x）N/GaN multiple quantum wells（MQWs） with different indium contents by means of photoluminescence（PL）,cathodeluminescence（CL） and time-resolved PL（TRPL） techniques.Besides the main emission peaks,all samples show another 2 peaks at the high and low energy parts of the main peaks in PL when excited at 10 K.CL images show a clear contrast for 3 samples,which indicates an increasing phase separation with increasing indium content.TRPL spectra at 15 K of the main emissions show an increasing delay of rising time with indium content,which means a carrier transferring from low indium content structures to high indium content structures.