Dynamic control approaches of spectrum sensing in multi-band cognitive radio networks

In this paper,the dynamic control approaches for spectrum sensing are proposed,based on the theory that prediction is synonymous with data compression in computational learning. Firstly,a spectrum sensing sequence prediction scheme is proposed to reduce the spectrum sensing time and improve the throughput of secondary users. We use Ziv-Lempel data compression algorithm to design the prediction scheme,where spectrum band usage history is utilized. In addition,an iterative algorithm to find out the optimal number of spectrum bands allowed to sense is proposed,with the aim of maximizing the expected net reward of each secondary user in each time slot. Finally,extensive simulation results are shown to demonstrate the effectiveness of the proposed dynamic control approaches of spectrum sensing.     

PIPENET软件用于海上平台消防水系统的水力分析

在介绍PIPENET水力分析软件的基础上,以某一海上无人驻守平台为例,重点论述了PIPENET软件在消防水系统水力分析方面的应用,分析结果表明,此海上平台的消防水系统在正常和故障状态下都能满足设计要求,验证了消防水系统设计的正确性。文章最后对PIPENET水力分析软件在平台消防水系统上的进一步应用提出了建议。     

超临界水堆反应堆物理-热工水力耦合程序系统MCATHAS的开发

针对超临界水冷反应堆(SCWR)开发了物理-热工水力耦合计算程序系统(MCATHAS)。该程序充分考虑SCWR轴向材料温度、密度的剧烈变化及和功率分布的相互影响。程序系统采用外耦合的方式;中子学计算采用连续截面库并行版MCNP程序;热工水力计算采用子通道ATHAS程序;燃耗计算采用ORIGEN程序。HPLWR燃料组件计算结果表明,程序计算结果是可靠的。     

模具表面的激光非熔凝加工的应用研究综述

介绍了模具表面激光非熔凝加工的特点及其研究发展现状，激光相变硬化过程中的温度场研究和硬化后残余应力场的研究状况，分析了激光固态相变硬化机理，以及激光表面非熔凝加工在模具上的应用情况，指出了进一步研究的方向．     

非定常Stokes问题解的存在唯一性的正则性

引入Ｆａｄｅｏ－Ｇａｌｅｒｋｉｎ方法解决了三维非定常半周期Ｓｔｏｋｅｓ问题解的存在唯一性问题，在加强了初始条件后，得到了解的正则性结果。     

A double-blind placebo-controlled phase II trial of thalidomide in asymptomatic HIV-positive patients: clinical tolerance and effect on activation markers and cytokines

A randomized double-blind, placebo-controlled study was performed to determine the safety, efficacy, and effect of thalidomide on a variety of immunological and biochemical parameters in asymptomatic human immunodeficiency virus (HIV)-positive patients. Nineteen male patients with elevated markers of immune activation and CD4 cell counts above 400/mm3 were randomized to either placebo or thalidomide at 100 mg/day for 24 weeks. However, only 3 (of 10) patients receiving thalidomide completed all 24 weeks compared to 6 (of 9) patients receiving placebo. This was mainly due to fatigue (somnolence is a recognized side effect), although this was also seen to a lesser extent in the placebo group and so may not be drug attributable. No significant changes in CD4/CD8 count, activation markers, TNF-alpha, or TNFR1 were observed. However, a nonsignificant trend toward inhibition of mitogen-induced TNF-alpha production was observed in the thalidomide arm. The lack of systemic effect and the lower tolerance of thalidomide (at this dose) in asymptomatic patients highlights the need for pharmacokinetic analysis to address possible absorption problems and the need for more potent and less toxic TNF-alpha inhibitors to be developed for use in this type of study.     

大力寻找柴达木盆地侏罗系油田——纪念陈贲首次论证油气再次运移

侏罗系是柴达木盆地的重要含油岩系，近年勘探连连有新发现。从柴达木盆地侏罗系油藏成因条件分析入手，指出，盆地中的侏罗系油藏为原生油藏，而第三系油藏则是原油通过断裂再次运移而形成的次生油藏，应当开展区域勘探和综合研究工作，在确定生油凹陷的基础上，实施定凹探边的方针。据初步分析，一里坪坳陷中的一里坪凹陷，侏罗系生油条件较好。因此，除冷湖－南八仙已知含油带外，鄂博梁背斜带可能是含油气富集带，伊克雅乌汝背斜带也应注意。