加强甘南藏区科技成果档案管理和开发利用

科技成果档案的有效开发和利用已成为经济发展、科技进步的要素。甘南藏区由于受各种环境因素的制约,科技成果的转化难度大,如何开发和利用好科技成果档案,充分发挥科技在经济建设中的支撑作用,对甘南藏区经济实现跨越式发展具有重要意义。     

基于KF的自平衡机器人姿态角补偿方法

研究基于卡尔曼滤波(KF)的低通滤波补偿方法,对采用单轴加速度计的自平衡机器人姿态角测量系统进行补偿,消除由于振动、冲击等引起的信号失真,增强控制系统的稳定性.根据前期研究及实验,深入分析振动、冲击对传感器信号的影响,提出了一种基于最小二乘拟合原理的姿态角计算模型.在获得机器人自由振荡频率的基础上,设计了基于KF的混合低通滤波单元,并进行了物理模型实验.结果表明,该补偿方法能完全消除振动造成的传感信号失真.此外,该补偿方法对强烈冲击所造成的信号波动亦有明显衰减,能显著提升自平衡机器人的稳定性.     

光伏箱变的发展和应用

随着电力电子技术的发展以及光伏系统的持续化深入研究,光伏箱变在光伏并网发电等领域所体现的优势越来越明显。本文从光伏并网逆变器等发展及应用角度对光伏箱变的发展应用进行有效的研究,使人们对光伏箱变越来越了解。     

基于LabVIEW的数字电压表的设计

为解决传感器实验室多路电压同时测量的问题,设计了基于LabVIEW的多路电压测量系统。该系统是由串口通信、数据解析、数据处理和电压显示等四部分组成。串口通信部分采用自定协议实现了与单片机采集系统的通信;数据解析部分实现了协议的解析工作,保证了数据传输的准确性;数据处理部分实现了数据采集格式到电压格式的转换,即标尺转换;电压显示部分实现了数值、图形显示和电压的超限报警功能。     

Study of new boson W_1~± in the Minimal Higgsless Model at the LHC

The Minimal Higgsless Model predicts the existence of new vector gauge boson W1± . By the process PP → W1± qq → W±Z0qq, Z0 → l+l-, W±→ qq (l=e,μ; q is hadronized to be jets), we study the sensitivity of searching for this possible vector gauge boson in the level of generator events of signal and backgrounds, then give integrated luminosity required to discover 5σ signal as a function of W1± mass. The generator for the signal PP→W1± qq→W±Z0qq at tree level is developed with the Minimal Higgsless Model and th...     

Optimal Capacity Allocation on Heterogeneous Complex Transport Networks

We study how the node delivering capacity is allocated so that the traffic transport efficiency can be enhanced maximally. Network heterogeneity of degree distribution and processing delay of the traffic are considered. An explicit analytical solution is provided, which is based on the M/M/1 queueing theory and optimization principle, provided that the network structure and routing strategy are given. In particular, we extend the relevant conclusions in the literature [Europhys. Lett. 83 （2008） 28001]. Finally, an order parameter simulation example by comparing results with those obtained via simple capacity allocation in large Barabasi—Albert （BA） scale-free network is provided to illustrate the effectiveness of the theoretical results.     

塔中地区中古8井区钻井提速认识

新疆塔中地区中古8井区中上部地层成岩性差、机械钻速快;但易出现井眼垮塌事故。中下部地层井壁不稳定,易出现周期性垮塌。部分层位抗研磨性强,易造成钻头损坏,而水平段地层会出现井漏严重、压力低、漏喷共存等复杂情况。针对这些提速难点,通过针对不同地层的多种PDC和牙轮钻头优选、votex旋转导向工具、水力振荡器、欠平衡钻井技术等提速技术的应用,形成了一套适合中古8井区的钻井提速技术。经过现场12口井的试验,三开水平段钻井周期平均缩短了24.7%。此套提速技术的应用为整个塔中地区的钻井提速提供了技术保障。     

Ratio of a strange quark mass ms to up or down quark mass mu,d predicted by a quark propagator in the framework of the chiral perturbation theory

Based on the fully dressed quark propagator and chiral perturbation theory, we study the ratio of the strange quark mass ms to up or down quark mass mu,d . The ratio is related to the determination of quark masses which are fundamental input parameters of QCD Lagrangian in the Standard Model of particle physics and can not be directly measured since the quark is confined within a hadron. An accurate determination of these QCD free parameters is extremely important for both phenomenological and theoretical applications. We begin with a brief introduction to the non-perturbation QCD theory, and then study the mass ratio in the framework of the chiral perturbation theory (χPT) with a parameterized fully dressed quark propagator which describes confining fully dressed quark propagation and is analytic everywhere in the finite complex p2-plane and has no Lehmann representation so there are no quark production thresholds in any theoretical calculations of observable data. Our prediction for the ratio ms/mu,d is consistent with other model predictions such as Lattice QCD, instanton model, QCD sum rules and the empirical values used widely in the literature. As a by-product of this study, our theoretical results, together with other predictions of physical quantities that used this quark propagator in our previous publications, clearly show that the parameterized form of the fully dressed quark propagator is an applicable and reliable approximation to the solution of the Dyson-Schwinger Equation of quark propagator in the QCD.     

五年制临床医学专业本科生科研能力培养的探索——以西北民族大学医学院为例

加强医学生科研素质的培养是医学本科教育的一项重要任务,也是我国医学本科教育改革亟待解决的重要课题.文章就西北民族大学医学院五年制临床医学专业本科生参与科研的现状进行分析,目前我院加强临床医学专业学生科研能力培养的具体实施策略以及通过实践已取得了初步成效,从而为更好地培养五年制临床专业本科生的科研能力提供了参考依据.