普朗克黑体谱要求钟速同步的传递性等价于第零定律

弯曲时空中的平衡热辐射，表现出用坐标量表示的普克黑体谱。以此为基础，论述了钟速同步的传递性等价于热平衡的传递性。第零定律保证全时空可以定义统一的钟速。     

Computational study of the substitution effect on the mechanism for phospha-Wittig reaction

The phospha-Wittig reaction HP=PH₃ + O=CHX → HP=CHX + O=PH₃ (X = H, F, Cl, Me, OMe, NMe₂, CMe₃) was examined using the density functional theory calculations. All of the structures were completely optimized at the B3LYP/6-311++G** level of theory. The reactivities of various O=CHX were examined by estimating their activation energies. The main finding of this work is that the configuration mixing model can successfully predict the relative ordering of the activation energy and reaction enthalpies of the phospha-Wittig reaction. It was demonstrated that O=CHX with more electro-releasing substituents will possess a smaller singlet–triplet splitting. This will facilitate the phospha-Wittig reaction and will result in a larger exothermicity.     

Scales, couplings revisited and low-energy phenomenology in M-theory on S^1/Z_2

We reconsider the dimension-11 Planck scale, the physical scale of the eleventh dimension, the physical scale of the Calabi–Yau manifold and the coupling in the hidden sector in M-theory on . Also we discuss reasonable bounds on them. Considering the F-term of the dilaton and moduli SUSY breaking and choosing two representative points which correspond to the scalar quasi-massless scenario and the dilaton dominant SUSY breaking scenario, respectively, we analyze experimental constraints on the parameter space. The sparticle spectrum and some phenomenological predictions are also given. Received: 9 June 1999 / Revised version: 12 July 2000 / Published online: 27 November 2000     

科里奥利质量流量计增益控制闭环设计

在双U型科里奥利质量流量计(CMF)原理研究的基础上,设计了实现驱动系统的物理闭环和增益控制闭环.增益控制单元作为增益控制闭环和物理闭环的共用环节,由增益控制信号产生电路和自动增益控制电路组成,前者检测来自物理闭环的振动幅度信息,并与设定安全值比较,后者根据比较结果利用场效应管的压阻特性来实现自动增益控制,以保证系统稳定工作.仿真结果表明电路设计与器件选择正确,预期功能实现良好.具体阐述了增益控制闭环的设计思路和设计实体.     

解决“豆腐渣”工程之我见

分析出现“豆腐渣”工程事故的严重性，提出要解决“豆腐渣”工程问题，须从体制入手。     

孔洞受压的统一极限分析

采用俞茂宏统一强度理论分别就平面应变和平面应力总是对受压孔洞进行了极限分析，得到了各自的统一解形式。以往的基于Ｔｒｅｓｃａ、Ｍｉｓｅｓ、双剪屈服准则以及Ｍｏｈｒ－Ｃｏｕｌｏｍｂ强度理论的极限解均为本文统一解的特例。此解可以适应于广泛的不同性质的各灯材料，合理也得出不同材料的相应解。     

Slack-nibbling battery-aware task scheduling

Dynamic voltage scaling (DVS) is an efficient approach to maximize the battery life of portable devices. A novel overall planning strategy (OPS II) balancing slack supply and demand for DVS is proposed. An OPS II-based slack-nibbling overall planning strategy (SNOPS) algorithm is also proposed, which iteratively nibbles slacks for appropriate tasks selected by an overall planning dynamic priority function to perform DVS until the slack is exhausted and an optimum voltage setting is obtained. For a high-load task set, SNOPS manages to recover battery overload while maintaining schedulability. For random variable-load task sets, SNOPS achieves a saving of 29.51% battery capacity on average, the suboptimal gap is 27.84% narrower than that of our previously proposed OPS-based algorithm, and 92.10% narrower than that of the algorithm proposed by Chowdhury et al. Results indicate that OPS II manages to save battery to various extents while maintaining schedulability, and demonstrates good load compatibility and close-to-optimal performance on average. Biography: GAO Xun(1981–), male, Ph.D. candidate, research direction: embedded system, power optimization.     

纯滞后系统的Smith-Fuzzy预估控制

介绍了Ｓｍｉｔｈ预估器存在的问题，采用模糊控制与Ｓｍｉｔｈ预估器相结合的控制策略．仿真结果表明，Ｓｍｉｔｈ－Ｆｕｚｙ预估控制器具有较好的控制效果和鲁棒性     

Equilibrium of drops on inclined fibers

Why is it that drops do not slip down inclined thin fibers or spider silks? The possible explanation is based on the existence of fiber size, which causes a sustaining force that pins these drops. Following this explanation, the drop remains in equilibrium until a critical value of the sustaining force is reached. We suggest an alternative analyses, from the point of view of the inclined fiber at which the drop slips down is predicted. This result does not depend explicitly on silk surface roughness, but only on the drop size and surface tensions.     

用石棉尾矿为主要原料制备微晶玻璃

本文介绍了用石棉尾矿为主要原料制备微晶玻璃的方法，并对其主要的性能进行了测试。本法尾矿处理量大，产品性能优越，是石棉尾矿开发利用、改善环境的一条有效新途径