模式选择阀门可调机构运动仿真分析

利用几何方法建立了基于曲柄滑块构型的模式选择阀门可调机构的滑块位移输入与阀门角度输出的关系,并对其进行了运动分析及精度分析。应用多体动力学仿真软件ADAMS建立了模式选择阀门可调机构的仿真模型,对其进行了刚体仿真,仿真结果与理论分析结果几乎一致,互相验证了数学模型与仿真模型的正确性。另外,当联动环为柔性时对其可调机构进行了柔性体仿真,分析了联动环在不同刚性下对各阀门输出同步性的影响,仿真结果表明,提高联动环的刚性能够提高各阀门输出的同步性。     

Effects of Time of Initial Exposure to MSV Sarcoma on Bone Induction by Dentine Matrix Implants and on Orthotopic Femora

HCl-demineralized murine lower incisors were implanted intramuscularly into syngeneic BALB/c mice to induce heterotopic osteogenesis. Implants were exposed at the early, preosteogenic stage (4), or at the later, osteogenic stage (12) to the Moloney sarcoma virus (MSV), which within 3-4 days results in a sarcoma. The yield of bone induction was determined by weight of dry bone mass following NaOH hydrolysis of soft tissues. To verify the effect of this sarcoma on orthotopic local femoral bone, the dry mass of the tumor-exposed femora was measured and compared with the weight of MSV-unexposed contralateral controls. MSV-sarcoma or cells involved with their spontaneous rejection have a stimulatory effect on the periosteal membrane of the tumor-adjacent femoral bones, increasing their dry mass on average by 18%. No stimulatory effect on heterotopic bone induction was observed when the MSV sarcoma grew during the early, preosteogenic stage (4 onward), but when the tooth matrix had been exposed to such tumor at the already bone-forming stage, (12 onward), the yield of bone induction was enhanced. Thus, it is postulated that lesions induced by MSV during the early, preosteogenic stage inhibit recruitment of osteoprogenitor cells or degrade Bone Morphogenetic Proteins (BMPs) released by matrix resorbing inflammatory cells, whereas when acting on already existing bone they have a stimulatory effect.     

Strength evaluation of a steam distribution device in the Ignalina NPP accident localisation system

The Ignalina NPP has a pressure suppression type of confinement, which is referred to as the accident localization system (ALS). The ALS prevents the release of the radioactive material from the NPP to the environment during a loss-of-coolant accident (LOCA). Ten water pools are located in the two ALS towers (five pools in each tower), which separate the dry well from the wet well. These water pools condense the accident-generated steam and prevent high overpressures in the compartments.The steam distribution device (SDD), with the vertical vent pipes (nozzles) that are inserted under the water of the condensing pools, connects the dry well and the wet well. In case of an accident, these components must be capable of withstanding the dynamic loads generated by a LOCA for successful pressure suppression function.This paper presents the transient analysis of the SDD and their connections to the vertical steam corridors following a LOCA. A thermo-hydraulic analysis of the SDD was performed using the state-of-the-art COCOSYS code to determine pressure and temperature histories resulting from a LOCA. The finite element code NEPTUNE was used to evaluate the structural integrity of the SDD and its supporting reinforced concrete wall. Results show that, although portions of the SDD undergo plastic response and the outside surface of the vertical steam corridor reinforced concrete wall cracks, the structural integrity of the SDD and wall are maintained during a LOCA.     

一类载人潜水器的导航技术研究

介绍了一类载人潜水器导航系统的组成,接着阐述了基于工业以太网的信息采集模块. 由于载人潜水器动力学模型存在未建模扰动以及各种传感器存在不同程度的误差,需要采用卡尔曼滤波器（KF）等方法进行数据滤波,最后将滤波后的数据用于该类载人潜水器的导航研究. 半物理仿真平台结果表明,载人潜水器的导航精度得到了大幅度提高.     

超超临界汽轮机主汽调节联合阀阀壳与阀座瞬态过盈接触分析

应用有限元软件ANSYS对超超临界汽轮机主汽调节阀进行瞬态过盈接触分析、热固耦合分析,给出了主蒸汽温度的下降速度和过盈量之间的影响关系。为进一步研究提高阀门效率和结构改进提供参考。     

Efficient nonrectangular shaped voltage island aware floorplanning with nonrandomized searching engine

Multi-supply voltage (MSV) technique is one of the efficient ways to reduce power consumption. However, MSV makes the physical design much more complicated. Especially, the randomized algorithm consumes much time as the size of the problem increases and the constraint of rectangular shaped voltage island limits better solutions in terms of power. In this paper, a nonrectangular shaped voltage island (NSVI) aware floorplanning is proposed with nonrandomized searching engine for efficient floorplanning. With a generalized slicing tree, a hypergraph is generated according to the cores' legal voltage levels, which is favorable to cluster cores working under the same voltage level together so that the called NSVIs can be generated easily. The proposed approach can deal with the fixed-outline floorplanning and perform well under different aspect ratios. Experimental results on GSRC benchmark suites indicate that the proposed method can obtain better solutions with less CPU time than published methods.     

载人潜器串口设备转接工业以太网的实时性建模与分析

根据具体的需求，为载人潜器设计了一种基于工业以太网的内部数据通讯和控制系统，其数据通讯的实时性是衡量控制系统的一个重要指标，因此，为了分析串行数据通信系统的实时性能，据其选用的传感器和网络架构的特点，建立了串日数据包传送时间延迟的数学模型；并在潜器平台上，以实测数据试验误差验证了该模型的准确性和普遍性，从而为开发人员对各种串口设备的参数设置提供理论指导；最后用该模型分析了载人潜器串行数据传送的实时性。     

低碳经济下能效电厂的半方差风险投资组合优化模型

探讨了低碳经济下能效电厂在各种节电措施下的风险投资优化组合问题。考虑到在低碳经济下,能效电厂的收益不仅包括售电收入,而且包括碳市场交易收入,将能效电厂在投资优化选择时要考虑的风险因素分为售电电价波动风险、碳交易价格波动风险和节电量波动风险。用半方差（mean semi—variance,MSV）代替传统的方差理论度量这...     

Approach to accident management in RBMK-1500

In order to ensure the safe operation of the nuclear power plants accident management programs are being developed around the world. These accident management programs cover the whole spectrum of accidents, including severe accidents. A lot of work is done to investigate the severe accident phenomena and implement severe accident management in NPPs with vessel-type reactors, while less attention is paid to channel-type reactors CANDU and RBMK.Ignalina NPP with RBMK-1500 reactor has implemented symptom based emergency operation procedures, which cover management of accidents until the core damage and do not extend to core damage region. In order to ensure coverage of the whole spectrum of accidents and meet the requirements of IAEA the severe accident management guidelines have to be developed.This paper presents the basic principles and approach to management of beyond design basis accidents at Ignalina NPP. In general, this approach could be applied to NPPs with RBMK-1000 reactors that are available in Russia, but the design differences should be taken into account.     

一种负荷特性对电压稳定影响的分析方法

在简单系统中,分析了将感性负荷的一部分等效为对地支路后对系统功率特性与负荷特性曲线相切点的影响。在多节点系统中应用块圆盘定理证明了将负荷等效为接地导纳支路后对潮流收敛性的影响。并应用矩阵特征值扰动定理和圆盘定理证明了只从节点的等效自阻抗的变化趋势并不能判明系统联系强弱的变化趋势。