江阴长江公路大桥纵向地震反应分析

应用“ＮＳＲＡＰ”程序对江阴长江公路大桥的纵向地震反应进行了空间非线性时程反应分析，着重讨论了行波效应，地震的竖向分量，桩－土－结构相互作用及多点激振对大跨度桥梁地震反应的影响。     

结构一体化模板在电厂楼层中的应用和展望

随着技术的发展,常见的定型组合钢模板、胶合板等模板施工工艺悄然发生着变化。压型钢板组合楼板结构等永久性模板已应用到了一些工业厂房的混凝土楼层平台。在此基础上对混凝土结构一体化模板作了展望和概念性设计,建立了新型模板组合梁构件的抗弯承载力计算模型和抗剪承载力计算模型,推演出新型模板应具备的部分物理参数之间的关系,如抗拉强度、弹性模量、应变、抗剪强度及新型模板材的本构关系等。理论计算的目的有两个：利用已知物理参数探寻新型一体化模板材料,或者对已知的一体化模板材料进行设计。     

超声波法提取甘草中的甘草酸

为了研究甘草酸的提取及提高提取产率的方法,以新疆乌拉尔甘草的粗粉为原料,研究了超声波条件下影响提取率的几个因素,包括溶剂、超声波作用的时间、静置时间等,结果表明：用超声波法提取,以70％乙醇为提取溶剂,超声频率为40kHz,超声作用时间为1h,静置24h,甘草酸的提取率可达18．41％．     

Preparation of the selenomethionine derivative of tabtoxin resistance protein

In order to obtain phase information for the X-ray diffraction of tabtoxin resistance protein (TTR) crystal using the MAD phasing method, a selenomethionine (Se-Met) derivative of TTR was overexpressed in E. coli strain M15, with pQE-30 plasmid, through IPTG induction in M9 medium containing Se-Met. The product was purified to an estimated homogeneity of greater than 95% according to SDS-PAGE, by a Ni-NTA metal affinity followed by a Mono Q anion exchange column chromatography. The successful substitution of Se-Met for methionine (Met) was confirmed by MALDI-TOF and ESI-Quadrupole Mass Spectrometry analysis. The derivative crystal was obtained using similar conditions as those for the native.     

柴达木盆地冷湖地区大地水准面模拟精化计算

根据青海石油局物探处在柴达木冷湖昆特依地区进行ＧＰＳ定位提供的高程信息，对该区大地水准面做了模拟精化计算分析，结果表明：该地区大地水准面起伏明显，南北向如ＬＨ３７—ＬＨ２４两点距为４３．４ｋｍ，高程异常值之差为０．７５ｍ，且由北向南逐渐降低；东西向如Ｓ２０５—ＧＢＧ０两点距离为２６ｋｍ，高程异常值之差为１．６２ｍ，由西向东逐渐抬高．在获得准确的高程异常情况下，就可得到精度较高的ＧＰＳ高程．同时也说明了用ＧＰＳ高程代替部分水准测量工作是可行的，这就为柴达木盆地大地水准面精化指出了研究方向．用ＧＰＳ精化大地水准是获取精密的大地水准面起伏的一种有效的方法，对地球物理及地球力场模型的建立等科研工作有着重要的意义     

从海南岛300例腹泻病人粪便标本分离耶氏菌

采用CIN培养基，从海南岛300例腹泻病人粪便标本分离培养出耶氏菌11株．其中，小肠结肠炎耶氏菌4株，血清型0：3；中间型耶氏菌7株.这7个中间型耶氏菌菌株均能分解鼠李糖、密二糖和棉子糖．     

切纵流联合收割机清选室内气流场的模拟仿真

切纵流联合收割机存在损失率大和含杂率高等问题,为分析清选性能较低的原因,对切纵流清选室内气流场分布进行模拟仿真,运用CFD仿真软件对清选室气道气流进行分析.仿真结果表明,清选室内气流在筛面宽度方向呈对称分布,沿筛面高度方向气流速度逐渐减小,沿筛长度方向筛前段气流速度较低,在接近筛中部时气流速度达到最大.并对清选室内气流场进行了测量试验,验证了气流场仿真的准确性.     

在嵌入式应用中增强Linux实时性的方法研究

在分析Linux实时性的同时,指出了将其应用于实时系统时所存在的不足,提出了一种提高Linux实时性的思想及实现方法．该方法将进入系统的所有任务按实时性要求不同分成硬实时任务、软实时任务和非实时任务三种,依次用task_struct结构中policy属性的取值SCHED_FIFO,SCHED_RR和SCHED_OTHER作为标识,把原Linux的单运行队列改为双运行队列．为严格保证硬实时任务的实时性,将其单独放在一个队列中,由指针数组的元素run_queue[0]指向,采用FIFO调度算法;软实时任务和非实时任务放在一个队列中,由指针数组的元素rurl—queue[1]指向,采用RR调度算法,通过抢占方式保证软实时任务优先于非实时任务．修改sched()函数的调度流程,使有实时性要求的任务尽可能多的得到调度机会;同时修改中断处理流程,实现可抢占式改造．达到硬实时任务可抢占软实时和非实时任务．软实时任务可抢占非实时任务的目的．     

通径系数法边坡面层破坏敏感性分析

边坡开挖后面层土体发生破坏受多种因素影响,不考虑外力作用以及几何参数,就边坡本身而言主要受制于黏聚力、土体重度和内摩擦角等因素。首先在各因素可行的范围内,采用明德林解计算土体物理参数中单个因素变化的情况下该边坡的破坏范围。参照边坡稳定性敏感分析,采用通径系数法对上述曲线进行分析,以水平破坏距离之比作为评价指标,得到影响边坡的因素敏感性由大到小依次为:黏聚力、内摩擦角、土体重度。     

EMG oscillator model-based energy kernel method for characterizing muscle intrinsic property under isometric contraction

This paper presents a new method for estimating the isometric contraction force and the characterization of muscle’s intrinsic property.The method,called the energy kernel method,starts with converting the electromyography(EMG)signal into planar phase portraits,on which the elliptic distribution of the state points is named as the energy kernel,while that formed by the noise signal is called the noise kernel.Based on such stochastic features of the phase portraits,we approximate the EMG signal within a rectangular window as a harmonic oscillator(EMG oscillator).The study establishes the relationship between the energy of control signal(EMG)and that of output signal(force/power),and a characteristic energy is proposed to estimate the muscle force.On the other hand,the natural frequencies of the noise and the EMG signal can be attained with the energy kernel and noise kernel.In this way,the direct signal–noise recognition and separation can be accomplished.The results show that the representativeness of the characteristic energy toward the force is satisfactory,and the method is very robust since it combines the advantages of both RMS and MPF.Moreover,the natural frequency of the EMG oscillator is not governed by the MU firing rate of a specific muscle,indicating that this frequency correlates with the intrinsic property of muscle.The physical meanings of the model provide new insights into the understanding of EMG.