单调算子的非线性最优控制

讨论状态空间变量满足非线性单调变分不等式的非线性最优控制问题解存在的充分条件和必要条件．特别是，得到了非线性单调变分不等式解存在的充分必要条件，并证明了控制变量为向量函数的最优控制问题解的存在性．     

实时视频流客户端自适应缓冲管理策略研究

针对目前客户端缓冲区管理策略适应性差、延迟大等缺点,提出了一种视频客户端自适应缓冲管理策略(Adaptive Management Strategy,AMS策略),详细地讨论了AMS策略的原理并进行了模拟实现,指出AMS策略能够有效地协调客户端缓冲区延迟和数据丢失之间的矛盾,提高直播系统的整体性能。     

Applications of14C-AMS in biomedical sciences (Bio-14C-AMS)

Accelerator mass spectrometry (AMS) is an ultrasensitive measure for tracing¹⁴C labeled moleculesin vivo or detecting the biomarker for assessment of carcinogenesis. In this review, basic principles, wide applications and new progresses of¹⁴C-bio-AMS are presented. It has been a new advanced tool for measuring the adduction of biologcial molecules with xenobiotics, including carcinogens, drugs, agrochemicals, nicotine, etc. The successful applications have proven the effectiveness of AMS to assessing cancer risk, screening drug toxicity and studying nutrients uptake. In particular, AMS is characterized by measuring xenobiotics at very low dose levels relevant to human environmental exposure. It is sensitive and precise to an attomole (10⁻¹⁸ mole) or less of¹⁴C per mg carbon. Although it has some shortcomings, undoubtedly, AMS possesses an evident merit of high sensitivity and will have widespread applications in the biomedical sciences.     

Regional Δ<Superscript>14</Superscript>C patterns and fossil fuel derived CO<Subscript>2</Subscript> distribution in the Beijing area using annual plants

The level of atmosphericΔ14C and the fossil fuel derived CO 2 concentration in the Beijing area from May to September,2009, were systematically analyzed based on radiocarbon(14C)measurements of annual plants by accelerator mass spectrometry(AMS). The results show that the maximumΔ14C in Beijing was 29.6‰±2.2‰,and the minimum was–28.2‰±2.5‰,with a trend of decreasingΔ14C from the outer suburbs to inner suburbs to the urban center.This trend correlates well with increases in fossil fuel derived CO2 caused by human activities such as population density,industrial emissions and traffic,with lower values of atmosphericΔ14C associated with more intensive human activities.The fossil fuel derived CO 2 concentrations from May to September, 2009,ranged from 3.9±1.0 ppm to 25.4±1.0 ppm.It was calculated that each additional 1 ppm of CO2 from fossil fuels depleted the atmosphericΔ14C by approximately 2.70‰.This study suggests that 14C measurements of annual plants by AMS provide an effective method to rapidly trace fossil fuel derived CO2.     

解析函数的一个正规定则

本文首先给出Rosenbloom不动点定理的一个简捷证明,进而得到与此相关的关於解析函数族的新正规定则。     

关于条件Logistic分布的两个猜测的证明

如果多维随机向量 Ｘ ＝ （ Ｘ１ ， Ｘ２ ， …， Ｘｎ） 满足条件分布是中心ｌｏｇｉｓｔｉｃ 分布，或条件分布和一维边际分布皆是ｌｏｇｉｓｔｉｃ 分布， 则在较弱的条件下证明了 Ｘ１ ， Ｘ２ ，…， Ｘｎ 相互独立     

溢流床反应器AMS加氢合成异丙苯

用自制的Pd／γ—Al2O3催化剂在溢流反应器中进行了α—甲基苯乙烯(简称AMS)催化加氢合成异丙苯反应条件的研究，探讨了反应温度、氢气压力、催化剂载量、液体流量(空时)、氢气放空速率对反应的影响．在实验条件范围内可使AMS转化为异丙苯的转化率和选择性都达到100％．     

Magnetic susceptibility variation and AMS exchange related to thermal treatment of siderite

Siderite is one of the common iron-bearing carbonates in deposits. Its magnetic properties are usually neglected due to its paramagnetic property at room temperature. It was shown that the magnetic susceptibility changes with temperature variation. Also it was revealed that the maximum axis ( K₁) of AMS ellipsoid exchange position gradually with the minimum axis (K ₃) during thermal treatment, and thus, AMS ellipsoids of samples change from initial prolate to oblate. It was concluded that such changes resulted from the decomposition and oxidation of siderite during heating in which siderite was transformed into magnetite, maghemite, and finally to hematite.     

加速器质谱技术检测细胞中DNA加合物的方法体系的建立及其应用

本研究采用加速器质谱技术对体外培养细胞进行化学致癌物——苯并芘及杀灭菊酯的DNA加合物的C的标记示踪研究,建立了DNA加合物的剂量效应关系,并初步探讨了化学致癌物与细胞作用时间与DNA加合物形成关系,建立的该细胞模型可为细胞水平的化学致癌的机理的探讨提供有力的手段。     

亏函数的亏量和取最大值的整函数的性质

对下级有限的整函数f(z)的亏值的亏量和满足∑a≠∞δ(a,f) =1的一个性质,将其亏值推广为亏函数, 这个结果推广了Edrei,A,&,Fuchs,WHJ的结果。