Kinetic analysis for effect of initial substrate concentration on growth and secondary metabolite production in cultures of Nicotiana tabacum

Suspension cultures of tobacco cells were studied using airlift and rotary-drum bioreactors. The effect of initial concentrations of a major substrate, sucrose, on the growth and production of a secondary metabolite, phenolic compounds, was investigated. The dry weights and total concentrations of the phenolic compounds increased with the initial sucrose concentration in both bioreactors. Both bioreactors were found to have the same tendency for the effect of initial sucrose concentration. The structured model, presented previously was modified by considering that sucrose was hydrolyzed to glucose and fructose by an enzymatic reaction. The previous and the new models were applied to the above two sets of experimental data obtained with two bioreactors, independently. The hydrolysis of sucrose was elucidated to contribute slightly to the overall kinetics of growth and secondary metabolite production in these cultures. Furthermore, the levels of shear damage in each bioreactor were quantitatively compared based on the death rate constant, k_i, which is one of the model constants.     

低温反相悬浮合成AA/AM共聚型吸水树脂

采用氧化还原引发体系，反相悬浮法低温合成AA／AM共聚型吸水树脂。研究了不同引发体系、单体组成、交联剂和引发剂浓度、温度、单体中和度对共聚物吸液能力的影响。与单一引发剂相比，采用复合引发体系，反应温度降低，聚合时间缩短，产物吸水速度和吸液能力高于聚丙烯酸钠，保水性略低于后者。共聚物最大吸液能力为：Q去离子水=970mL／g，Q生理盐水=129mL／g，Q人工尿=130mL／g。     

Life Prediction Based on Transient Dynamics Analysis of Van Semi-trailer with Air Suspension System

The early fatigue damage in the van-body of the semi-trailer is often caused by the unique mechanical characteristics and the dynamic impact of the loads.The traditional finite element method with static strength analysis cannot support the fatigue design of van-body;thus,the dynamics analysis should be adopted for the endurance performance.The accurate dynamics model to describe the transient impacts of all kinds of uneven road and the proper system transfer functions to calculate the load transfer effects...     

On Complex Codimension-One Foliations Transverse Fibrations

We study codimension-one holomorphic foliations which are transverse to fibrations and, therefore, are conjugate to suspensions of groups of M?bius transformations. For the general case, we assume that there exists an invariant transverse measure. The existence of such an invariant transverse measure is proved for the case where there is a leaf with the subexponential growth or the basis has an amenable fundamental group. This result applies, e.g., for the study of amenable Lie group actions on complex projective spaces. 2000 Mathematics Subject Classification. Primary 37F75; Secondary 57R30, 53C12.     

非线性平衡布尔函数及其构造方法

介绍了抗密码分析能力强的布尔函数的两个重要特性:平衡性和非线性,并研究了三种可产生具有高非线性的布尔函数的方法,即链接、分裂、修改序列。最后指出通过修改序列获得的平衡布尔函数比通过以往任何构造方法获得的具有更高的非线性。     

Design of Fully Balanced Analog Systems Based on Ordinary and/or Modified Single-Ended Opamps

The system architectures, which allow a high performance fully balanced (FB) system based on ordinary/modified single-ended opamps to be implemented, are investigated and the basic and general requirements are formulated. Two new methods of an FB analog system design, which contribute towards achieving both a high performance IC system implementation and a great reduction of the design time are presented. It is shown that a single-ended system based on any type of opamp (rail-to-rail, constant g _m , etc.), realized in any technology (CMOS, bipolar, BiCMOS, GaAs), can be easily and effectively converted to its FB counterpart in a very practical way. Using the proposed rules, any FB system implementation with opamps (data converter, modulator, filter, etc.) requires only a single-ended system version design and the drawbacks related to a conventional FB system design are avoided. The principles of the design are pointed out and they are verified by experimental results.     

超声反射法测量悬浊液浓度分布的特性研究

在泥沙研究中，含沙量及其沿垂线分布的测量问题非常重要。目前基本上是采用传统的方法．费时费力，而且无法做到实时、连续测量。为了探索新的测试方法，本文报道利用超声反射法，根据声波在浑水中沿垂线传播时，不同深度、不同浓度泥抄颗粒对声波的散射信号不同这一原理，对泥沙浓度、深度及其粒径与散射强度的关系进行大量实验研究，以期能实现含沙量垂线分布的自动测试。     

Statistical analysis of large on-chip power grid networks by variational reduction scheme

One of the most critical challenges in today's CMOS VLSI design is the lack of predictability in chip performance at design stage. One of the process variabilities comes from the voltage drop variations in on-chip power distribution networks. In this paper, we present a novel analysis approach for computing voltage drops of large power grid networks under process variations. The new algorithm is very efficient and scalable for huge networks with a large number of variational variables. This approach, called variational extended truncated balanced realization (varETBR), is based on model order reduction techniques to reduce the circuit matrices before the variational simulation. It performs the parameterized reduction on the original system using variation-bearing subspaces. After the reduction, Monte Carlo based statistical simulation is performed on the reduced system and the statistical responses of the original system are obtained thereafter. varETBR calculates variational response Grammians by Monte Carlo based numerical integration considering both system and input source variations in generating the projection subspace. varETBR is very scalable for the number of variables and flexible for different variational distributions and ranges as demonstrated in experimental results. Experimental results, on a number of IBM benchmark circuits up to 1.6 million nodes, show that the varETBR can be 1900X faster than the Monte Carlo method and is much more scalable than one of the recently proposed approaches.     

对称三进制光学加法器的进位直达通道设计

以对称三进制光学半加器为基础,提出了一个对称三进制光学全加器方案。主要介绍了进位直达并行通道在对称三进制光学全加器中的实现方案和工作原理,从而论证了实现对称三进制光学全加器的可行性。     

反相悬浮法制备丙烯酸钠与丙烯酰胺共聚物吸水剂

以十八烷基磷酸单酯做分散剂,采用反相悬浮聚合法(ISP)制备了丙烯酸钠与丙烯酰胺共聚物吸水剂。聚合体系稳定,聚合物呈颗粒状,经过滤干燥即得,无需减压蒸馏溶剂。探讨了各种反应条件对聚合物的物理状态,吸去离子水达680ml/g聚合物,吸盐水达68ml/g聚合物。