用Monte—Carlo法计算电磁场

本文应用蒙特卡罗法计算复杂的三维电磁场。由于采用了一种既快速又能产生出较好统计性的“伪随机数”的算法，因而得到了较理想的结果。此外，本文还提供一个估计精度的公式，并指明改进精度估计的措施。     

Qualitative Analysis of an Exponential Dynamic Neural Networks

The exponential dynamic neural network proposed.by T.D.Chiuch and R.M.Goodman in 1988 is investigated. A concise sufficient condition for the given standard patterns to bestable is presented. A one-step conversence radius of such a stable state is obtained. It is also shownthat there do not exist sporious stable states in the probabilistic sense.     

The method for removing the spurious modes of eigensystem realization algorithm

Due to the influence of spurious modes on the eigensystem realization algorithm results,singular value decomposition(SVD) and model energy level are introduced to remove the spurious modes of eigensystem realization algorithm,reduce part of the noise modes and improve the accuracy by reducing measurement noise by SVD. The energy matrix of each mode can be calculated by the selection matrices,the eigenvalues and eigenvectors of the state matrix and the input distribution matrix. The largest singular value of the energy matrix obtained by SVD is a measure for the energy contribution of each mode,which is named mode energy level. Spurious modes resulting from noise or model redundancy are indicated according their mode energy level. A numerical example and an experimental example are presented to demonstrate the efficacy of the method.     

RR-CETEN Algorithm: Making TC PMore Robust Against Spurious Retransmissions

Numerous studies have shown that packet reordering is common,especially at wireless and Satellite networks where there are high degree of parallelism and different link speeds.Packets reordering decreases TC Pperformance,because it leads to over estimation of network congestion.The CETEN(Cumulative Explicit Transport Error Notification) has solved the overestimation caused by packet corruption.However,it does not consider the reordering at wireless network,which makes the LEAST(Loss Estimations AlgorithmS for TCP) loss rate value imprecise.The solution is based on explicit spurious retransmit notification at receiver side,and signals the sender packet loss caused by reordering packet.This mechanism can improve precision of LEAST and make the TC Pmore robust.The method is showed efficient in experiment.     

Design of a compact hairpin microstrip bandpass filter using SIR

Abstract:Because of high performance filters’ complicated structure and big dimension, a compact hairpin microstrip bandpass filter centered at 2.45 GHz is designed and developed based on stepped impedance resonator (SIR).The performance of the filter is improved and the dimension is reduced by kinking the half wavelength SIRs coupling structure to ‘U’ shape, which is hairpin.The results of simulation and measurement of the PCB demonstrate that the insert loss is less than 2 dB in the frequency domain from 2.42 to 2.48 GHz, the 3 dB bandwidth is 130 MHz, the return loss in the middle frequency is as high as 30 dB, and the stop band suppression is bigger than 30 dB in the frequency domain from DC to 2 and 2.8 to 11 GHz. It can be seen that this filter not only suppresses the spurious band effectively, but also have simple and small structure with dimension smaller than 26 mm×22 mm.     

含结构变点无限方差序列的伪回归检验

基于最小二乘回归理论，研究了含结构变点无限方差序列的伪回归检验.结果表明，对两列含结构变点无限方差序列进行线性回归分析时，当两序列尾部指数之和小于1.5时，无论结构变点位置是否相同，t检验统计量均发散，导致伪回归现象的出现.究其原因，结构变点增加了回归误差的持久性，从而产生伪回归.蒙特卡罗数值模拟结果表明，伪回归现象不仅受序列尾部指数的影响，且对结构变点的位置敏感.     

Bromide intoxication in a 3-year-old Thoroughbred filly

A 3-year-old Thoroughbred filly presented with a several-month history of weight loss, polydipsia and polyuria, intermittent diarrhoea and behavioural changes and intermittently uncoordinated gait. Neurological examination revealed hyperexcitability, bilaterally reduced pupillary light reflexes and quadrilateral ataxia with proprioceptive deficits more obvious in the forelimbs than in the hindlimbs. A multifocal neurological lesion was suspected. The laboratory finding of a persistent hyperchloraemia and an apparent negative anion gap prompted measurement of serum bromide concentration and subsequently confirmed bromide intoxication. Further questioning of the trainer revealed that the filly had been administered oral potassium bromide for behavioural modification over several months. Clinical signs of bromide intoxication resolved within 20 days following the last bromide administration, without specific medical intervention. This case report describes the risk of inadvertent bromide overdosing in horses and highlights the need for control of bromide use in the equine industry.     

Spurious hyperphosphatemia in a dog with chronic lymphocytic leukemia and an IgM monoclonal gammopathy

Spurious hyperphosphatemia was diagnosed in a 6-year-old, neutered female, mixed-breed dog with chronic lymphocytic leukemia associated with an IgM monoclonal gammopathy. The spurious hyperphosphatemia was probably caused by paraprotein precipitation which interfered with the ASTRA 8 automated analyzer measurements. Serial dilutions of the sample did not change the phosphorus value. Another analyzer system in which a protein-free sample was prepared prior to analysis gave a normal serum phosphorus concentration. There was a linear relationship between the amount of paraprotein and the measured total serum inorganic phosphate (r=0.75). A review of 700 chemistry profiles from dogs and cats and a review of 36 cases with polygonal gammopathy and 6 cases with monoclonal gammopathy did not reveal other cases of spurious hyperphosphatemia.