Exact inference for two exponential populations with competing risks data

In a reliability comparative test, the joint censoring model is usually adopted to evaluate the performances of units with the same facility. However, most researchers ignore the pos- sibility that there is more than one factor for the failure when a test unit fails. To solve this problem, we consider a joint Type-II hybrid censoring model for the analysis of exponential competing failure data. Based on the maximum likelihood theory, we compute the maximum likelihood estimators （MLEs） of parameters and then obtain the condition ensuring MLEs existence for every unknown parameter. Then we derive the conditional exact distributions and corresponding moment properties for parameters by the moment generating function （MGF）. A Monte-Carlo simulation is conducted to compare the performances of different ways. And finally, we conduct a numerical example to illustrate the proposed method.     

红曲霉产生的生理活性物质的研究──Ⅰ．含麦角固醇红曲霉产红色素的条件因子及其培养条件

在研究红曲霉产生生理活性物质的过程中，获得麦角固醇含量较高的红曲霉菌株，从中选择两株进行产生红色素条件因子的研究，实验结果表明，甘油、大米粉、温度、ｐＨ对产生红曲色素具有较大的制约作用。     

Efficient photoelectrochemical CO2 conversion for selective acetic acid production

Amidst the development of photoelectrochemical(PEC)CO2 conversion toward practical application,the production of high-value chemicals beyond C1 compounds under ...     

氯化苄/四水合氯化亚铁/三苯基膦引发甲基丙烯酸甲酯“活性”/可控自由基聚合

以氯化苄(C6H5CH2Cl)/四水合氯化亚铁/三苯基膦为引发体系,在90 ℃下引发甲基丙烯酸甲酯进行原子转移自由基"活性"/可控聚合反应(ATRP).只有当Fe与P的量比值为1∶2时,聚合产物数均分子质量(Mn)与转化率才呈现一定的线性关系,聚合反应机理表现为ATRP.对于其它Fe与P的量比值,产物Mn与转化率不呈线性关系,表明在聚合反应过程中存在多种活性中心;由于所使用的氯化亚铁含有结晶水,催化剂的制备方式对ATRP有较大影响.     

CVD金刚石薄膜表面晶形研究

本文较详细地研究了采用ＨＦＣＶＤ方法在Ｓｉ、Ｍｏ等衬底上生长出的不同表面晶形的多晶金刚石薄膜，讨论了生长条件（衬底温度、碳源浓度、反应压强）对金刚石薄膜晶粒形貌的影响．结果表明在ＨＦＣＶＤ方法中，金刚石薄膜表面晶形对生长条件十分敏感，生长条件的微小变化就会导致不同表面晶形的生长．     

薄板圆筒轴向冲槽尺寸误差分析及补偿方法

分析了薄板圆筒轴向冲槽宽度尺寸产生误差的原因,提出了轴向冲槽弹性恢复量y 沿轴向呈抛物线变化的假设和冲槽宽度尺寸误差的补偿办法     

对冰球运动员心理素质训练的研究

本文对我国优秀冰球运动员的心理素质进行了全面的调查和训练现场的技术指标统计分析,研究发现,运动员的心理素质是直接影响我国冰球运动水平提高的重要因素,通过对研究对象半年多的现场实验研究提出了心理素质训练的模式,以及在动运员身体训练、技术训练、战术训练中有效进行心理训练的方法。     

静止环境中甲醇液滴蒸发的数值模拟

采用单液滴非平衡蒸发的数学物理模型,研究了静止环境中甲醇液滴的瞬态蒸发特性,获得了不同环境压力、环境温度和液滴的初始温度条件下液滴半径和液滴温度的变化规律.结果表明,随着环境压力的升高,液滴所达到平衡蒸发温度上升,在环境温度高于临界温度时,液滴蒸发加快,而在环境温度低于液滴临界温度时,液滴蒸发减慢.随着环境温度的上升,液滴蒸发速度加快,液滴达到的平衡温度上升.液滴初始温度对瞬态加热阶段的蒸发有一定的影响,而对平衡蒸发阶段的蒸发几乎没有影响.     

Data acquisition, analysis and applications of multi-sensor integration

This paper presents some key techniques for multisensor integration system, which is applied to the intelligent transportation system industry and surveying and mapping industry, e.g. road surface condition detection, digital map making. The techniques are synchronization control of multisensor, spacetime benchmark for sensor data, and multisensor data fusion and mining. Firstly, synchronization control of multisensor is achieved through a synchronization control system which is composed of a time synchronization controller and some synchronization subcontrollers. The time synchronization controller can receive GPS time information from GPS satellites, relative distance information from distance measuring instrument and send spacetime information to the synchronization subcontroller. The latter can work at three types of synchronization mode, i.e. active synchronization, passive synchronization and time service synchronization. Secondly, spacetime benchmark can be established based on GPS time and global reference coordinate system, and can be obtained through position and azimuth determining system and synchronization control system. Thirdly, there are many types of data fusion and mining, e.g. GPS/Gyro/DMI data fusion, data fusion between stereophotogrammetry and PADS, data fusion between laser scanner and PADS, and data fusion between CCD camera and laser scanner. Finally, all these solutions presented in paper have been applied to two areas, i.e. landborne intelligent road detection and measurement system and 3D measurement system based on unmanned helicopter. The former has equipped some highway engineering Co., Ltd. and has been successfully put into use. The latter is an ongoing research.