Prolactin gene polymorphism in Nili‐Ravi buffaloes in relation to Sahiwal and Achai Cattle

In this study, prolactin gene polymorphism was investigated in Nili‐ Ravi buffaloes, Sahiwal and Achai cattle breeds, 100 per group, using polymerase chain reaction–restriction fragment length polymorphism (PCR‐RFLP) technique. Only genotype GG was observed in the case of Nili‐Ravi buffaloes. In Sahiwal and Achai cattle, three genotypes were found, AA, AG and GG: the frequency of these genotypes were 72%, 18% and 10% in Sahiwal cattle and 44%, 34% and 22% in Achai cattle, respectively. The frequency of genotype AA was found to be higher in both cattle breeds. Results of chi‐square test at P < 0.05 revealed that animals of Achai cattle were in Hardy–Weinberg equilibrium, whereas Sahiwal cattle were found to be deviating.     

（英）W波段InP HBT 宽带高功率压控振荡器

本文介绍了一款具有较高输出功率和宽调谐频率范围的基波压控振荡器单片集成电路。其制作工艺为f_T =170GHz,f_max =250GHz的0.8um InP DHBT工艺。电路核心部分采用了平衡式考毕兹振荡器拓扑,并在后面添加了一级缓冲放大器来抑制负载牵引效应,并提升了输出功率。DHBT的反偏CB结作为变容二极管来实现频率调谐。芯片测量结果表明,VCO的频率调谐范围为81- 97.3GHz,相对带宽为18.3 %。在调谐频率范围内最大输出功率为10.5 dBm,输出功率起伏在3.5 dB以内。在该VCO的最大调谐频率97.3 GHz处相位噪声为-88 dBc/Hz @1MHz。在目前所报道的InP HBT基VCO MMIC中,本文在如此宽的频率调谐范围内实现了最高的输出功率。     

“突厥语大词典”电子词典的设计与实现

介绍了11世纪中国突厥语言学著作"突厥语大词典"的电子词典软件的设计与实现。突厥语大辞典的电子版是突厥语大辞典的维、土、汉、英版本的基础上研究了多语种(维吾尔语、土耳其语、汉语、英语)突厥语大辞典电子版的构建技术。实现了具有通过原词或原词在以上四种不同语言中的词义来快速查找的功能。详细介绍了本词典的总体结构、功能、数据库设计、查找算法、系统运行机制。最后提出了进一步增强、改进系统的一些设想。     

Modeling and analysis of multiservice queuing system for WiMAX network

An analytical queuing model is proposed for the classified services of WiMAX network. Simulation model is also developed that corresponds to the Markovian analytical model using Java modeling tool (JMT) . This is a new and efficient discrete event tool for queuing network modeling and workload analysis. QoS metrics have been evaluated for the multi-rate traffic in multiple scenarios. Results obtained from simulation are compared for validation and analysis. Outcomes show that the proposed model is more efficient than the conventional method by improving residence time,response time,increasing system throughput and efficiency at queuing level with a slight degradation in call acceptance factor.     

Phototransients in 30 mol% CdO-70 mol% P2O5 glass

Phototransients produced when radiation of wavelength 240 nm is switched on have been studied in (30 mol% CdO-70 mol% P²O⁵ glass at various applied voltages. The phototransients show a linear rise with field, while their decay time (time taken by the photocurrent to attain its steady value) tends to saturate at higher fields. For shorter times ΔIα exp (? t/r), while for longer times there is a departure from the exponential behaviour. These phototransients may be due to trapping of photo-excited charges by ionized donors and space charge effects.     

Brief communication Modelling the static emitter characteristics of unijunction transistors

An empirical formula is presented for the static emitter characteristic of the unijunction transistor (UJT). The three parameters of the formula can be calculated easily from separate regions in the device characteristic using manual calculations.     

Prediction of carrier to intermodulation performance

Closed-form expressions correlating the carrier to intermodulation performance, of two SCPC systems, with the simple two-carrier measurements are obtained. It is assumed that the high power amplifiers are exhibiting both amplitude non-linearity and AM/PM conversion characteristics. The high power amplifier is modelled by a quadrature model, which is mathematically represented by two sets of sine functions. Special eases are considered where curve fitting techniques, usually used to find the parameters of the sine function representations, can be totally avoided.     

Harmonic and intennodulation performance of wideband memoryless non-linear amplifiers

By using a different, but equivalent, representation for the general Fourier -series representation, it in shown that the available computer programs, originally designed for in term ovulation analysis of memoryless bandpass nonlinear amplifiers, are adaptable to wideband amplifiers after very minor modifications.