稳定节点积分伽辽金无网格法的应力计算方法研究

应力计算是基于稳定节点积分的伽辽金无网格法的重要组成部分.该文着重研究稳定节点积分伽辽金无网格法的应力计算方法,对稳定节点积分方法的变分一致条件进行了讨论,证明当节点代表域内的应变采用非局部光滑应变时,相应的应力在节点代表域内为常数,稳定节点积分伽辽金无网格离散方程是变分一致的.文中提出了三种节点应力计算方法,研究表明,基于位移梯度的节点应力计算方法不满足变分一致性要求,而采用光滑应变的节点应力计算方法和一致形心应力计算方法满足变分一致性要求.典型数值算例的误差分析表明,满足变分一致性不一定确保得到更为精确的结果,而基于光滑应变的一致形心应力计算方法总是较其它两种方法更为精确

基于TH7122.1芯片的无线数据传输模块设计

TH7122.1芯片是一款由比利时Melexis公司开发的低功耗单片集成无线收发芯片。主要介绍该芯片的功能特点,并以该芯片为基础设计一种低成本的半双工无线数据传输模块。调试结果表明,所实现的模块无线数据通信稳定可靠。利用该模块可以实现结构简单、性能稳定的无线数据通信系统,在某些短距离无线应用场合具有实用价值,对其他无线应用系统的设计具有参考价值

杂交元零能模式抑制的正交基本变形模式方法

通过杂交元位移场直接推导了单元基本变形模式,并且采用联合正交条件提出一种新的正交化方法,所得到的正交基本变形模式不仅具有简单的变形特征而且和材料参数无关,可以方便有效地考察单元性能,为评价不同杂交元提供了一个统一的参考标准.在此基础上利用柔度矩阵正定性给出一种简单有效的零能模式识别方法,并进一步利用基本变形模式和初始应力模式之间耦合关系,提出一种抑制杂交元零能模式的假设应力场方法,同时指出基本变形模式正交性是抑制单元零能模式的充分必要条件.2D-4节点和3D-8节点单元的数值算例说明了该文基本变形模式方法的有效性

内蒙古西部农牧区被动式住宅围护结构优化

为提升内蒙古西部农牧区被动式住宅室内热环境、降低采暖能耗,对具当地被动式住宅进行调研,选取了影响冬季采暖能耗的因素并进行了量化。采用能耗模拟分析软件De ST-h和正交实验的方法研究了住宅朝向、南向窗墙比、北向窗墙比、透明围护结构材质、保温层厚度、非透明围护结构材质、附加阳光间进深等7个主要因素。通过对18种组合方案的分析,以采暖能耗为评价指标得出优选组合方式。最后建立了内蒙古西部农牧区被动式住宅采暖能耗预测模型,为农牧区被动式住宅设计提供参考。研究结果能提升农牧区被动式住宅的节能设计水平。国家自然科学基金(51668051、51768053);;内蒙古自然科学基金(2016MS0516、2017MS(LH)0532);;西部绿色建筑国家重点实验培育基地开放研究基金(LSKF201803)资

Residential Thermal Comfort in Western Agricultural and Pastoral Areas of Inner Mongolia in Shoulder Season

对内蒙古西部农牧区的81户住宅的过渡季和采暖期初的室内外环境参数进行了现场测试,并以主观问卷调查的方式对居民的着装情况和热感觉等做了统计。经过对; 调查测试的结果进行了统计分析,得出内蒙古西部农牧区的的过渡季和采暖期初的热中性温度为15.6 ℃和15.3 ℃,热期望温度为17.9; ℃和18.6 ℃, 80%居民可接受温度下限为13.1 ℃和14.3 ℃, 90%的热可接受温度范围为15.9 ~ 23.3 ℃和17.5 ~; 21.9 ℃。结果表明处于当地气候条件下和穿衣、适应措施的综合影响下,农牧区居民对偏冷环境的适应性较好。The indoor and outdoor environmental parameters of 81 houses in the; western agricultural and pastoral areas of Inner Mongolia in shoulder; season and heating periods were tested.Questionnaire about the clothing; and thermal sensation was sent to residents in the houses.By analyzing; the survey results,it was found that the acceptable neutral temperature; in shoulder season and heating periods is 15.6 ℃ and 15.5; ℃,respectively; the preferred temperature in shoulder season and heating; periods is 17.9 ℃ and 18.6 ℃,respectively; the lowest temperature that; 80% residents can accept in shoulder season and heating periods is 13.1; ℃ and 14.3 ℃, respectively; and the thermal comfort temperature at which; 90% residents feel satisfied in shoulder season and heating periods; ranges from 15.9 ℃ to 23.3 ℃ and from 17.5 ℃ to 21.9 ℃,respectively.The; results show that the residents in agricultural and pastoral areas are; better adaptable to the cold environment because of the combined; influence of local climate,dressing and adaptation measures.国家自然科学基金资助项目; 内蒙古自然科学基金资助项目; 内蒙古自然科学基金资助项目; 内蒙古研究生教育创新计划资助项

The Effects of Different Lights and Gibberellin on Establishment of Parasitism between Dodder and Its Hosts

首次使用lEd作为光源,研究不同光照条件及gA3对菟丝子(CuSCuTA SPP.)弯钩打开、缠绕发生与吸器形成的影响。结果表明,光照信号作为一个必要条件参与了菟丝子对寄主的识别及缠绕发生的调控,而化学信号可能起到一定的促进作用;gA3参与了对菟丝子缠绕发生的调控,但对弯钩打开没有明显的作用。除了典型的光敏色素作用外,还有另一类光反应(HEr)参与了上述过程,这类光反应可由879 nM远红光引发,证明菟丝子存在HEr,还有Pfr向Pr的暗转化过程,在缠绕发生过程中光敏色素和隐花色素发生相互作用。The effects of different light treatments and GA3 on hook opening,twining and parasitism of Cuscuta australis were studied using LED as light sources for the first time.The results showed that light was a necessary factor for dodders to parasitize the hosts successfully and chemical signals might facilitate host recognition and twining.GA3 involved in controlling twining response,but no distinct effect on hook opening.Furthermore,besides typical(phytochrome reaction,another photoreaction called HER was involved in these processes,which could be caused by 879 nm far red light.So it demonstrated directly that there was not only HER in dodders,but also dark conversion from Pfr to Pr,and there were mutual interaction of phytochromes and cryptochromes in twining.教育部重点项目(101102)资

Reactivity Ratio of Methyl Acrylate with Methacrylates For Group TransFer Copolymerization

丙烯酸甲酯和甲基丙烯酸酯基团转移无规共聚的竞聚率⒇邹友思林东海张景辉潘容华（厦门大学化工系，厦门大学核磁共振实验室，厦门，361005）单体竞聚率作为一个定量数据，对于不同投料比下共聚物组成的预计和控制，共聚反应动力学和机理研究均有重要作用。丙烯酸...Statistical group transFer copolymerization of methyl acrylate(MA) with methacrylates have been perFormed For three binary systems. The copolymer compositions were determined by 1H NMR spectroscopy and the results were evaluated by the extented Kelen Tudos method. The monomer pairs concerned are (1) methyl acrylate (MA) and ethyl methacrylate(EMA), (2) MA and butyl methacrylate(BMA), (3) MA and i butyl methacrylate(iBMA). The reactivity ratios were Found to be γ MA =14.41, γ EMA = 0.01 ; γ MA =13.96, γ BMA =0.23; γ MA =8.66, γ iBMA =0.08. It was Found that acrylate is much more reactive than methacrylate For GTP and anionic copolymerization.国家自然科学基

Experimental study of the sea floor damage due to gas escape in hydrate dissociation

海床下水合物分解可能造成大量的生成气体泄漏.气体渗漏一方面造成海床表层的破坏;另一方面使得海水密度减小造成海上一些结构的安全隐患.本文通过实验研究泄漏气体在水中上升过程中的扩散行为,以及渗漏对海底粉砂土海床的破坏规律.考虑压力,盖层厚度在渗漏气体对盖层土体形态破坏的影响,获得了气体在水中上升过程中的扩散角的特点,以及气体泄漏导致的海床冲刷坑范围随气体压力、土层厚度的变化规律,可以为进一步的研究和工程应用提供参考. 更多还

有机光波导放大器最新进展

稀土掺杂平面光波导放大器是一类重要的光子学元件,它是光通信密集波分复用(DWDM)传输系统的重要组成部分,可以和调制器、光开关、隔离器、阵列波导光栅等任何有损耗的器件集成在一起,补偿光传输过程中的各类损耗。综述了应用于第二(1.33μm)、第三(1.53μm)标准通信窗口的有机光波导放大器的研究现状,阐述了不同类型材料制备的器件存在的优缺点、制备过程中存在的问题,并对其发展前景进行了展望

Experimental Study on Enhancement of Ammonia Bubble Absorption Process by Adding Nanoparticles

From the Danckwerts theoretical surface renewal model of mass transfer,an approach using nanoparticles to enhance ammonia bubble absorption process was examined in this study.In our experiment,the ammonia vapor flow flux and the concentration ratio of bulk ammonia solution were adjusted and their effects on ammonia bubble absorption were explored.The experimental results show that the absorption ratio was significantly increased by adding Al2O3 nanoparticles in the bulk solution,and the effective absorption..