高层电梯系统运行方案的建模与求解

随着社会的发展,运用垂直交通系统的高层建筑和智能化建筑不断出现。而有效的电梯交通配置,是垂直交通系统高效运行的基本保证。本文针对高层商务建筑中的电梯运行管理方案设计问题,分析了影响电梯耗能和用户满意度的主要因素。分别建立了电梯数目已知和电梯数目未知情况下的电梯调度优化模型,并设计相应动态规划算法和遗传算法。结合算例,求解算例中的电梯优化调度方案,以验证模型的合理性。最后根据我们建立的电梯调度模型,借助VC++作出可视化的电梯调度示意界面,将本文的研究结果用于实际的电梯调度中。     

关于狮子盘球力学原理的注记——论内力与外力的关系

以人在球体上走动引起球体向前滚动为例,利用牛顿定律说明人-球系统中内力、外力与运动之间的关系.尽管阻碍球体滚动的地面摩擦是人-球系统向前运动的必要条件,且作为外力与系统动量变化率相等,但从运动的因果关系考察,人与球体之间的竖直作用力才是系统运动的真正动力.     

近红外光谱预测稻谷水分含量特征谱区选择及其效率分析

对364份水分含量在2.24%～32.66%之间的“冈优916”稻谷样品,经均值中心化、一阶微分、标准归一化和多元散射校正等预处理后,采用分段间隔法、组合分段法、滑动窗口法和反向分段法等进行特征谱区选择,分别使用偏最小二乘法(PLS)和主成分回归(PCR)两种定量分析方法,获得稻谷含水量近红外光谱预测模型最佳的特征谱区。首次给出了分段间隔法、组合分段法、滑动窗口法和反向分段法等传统的特征谱区选择方法的计算复杂度的计算公式,并对比分析了这几种特征谱区选择方法的程序运行效率。结果表明：采用PLS建模对稻谷含水量光谱的预测性能优于PCR建模,但PLS建模的效率低于PCR建模;在PLS建模中,采用反向分段法对稻谷光谱含水量的预测性能最好,其预测集的相关系数R_P为0.995 6,预测均方根偏差RMSEP为0.78%;其次是滑动窗口法,其R_P为0.994 3,RMSEP为0.89%;但这两种特征谱区选择方法的程序运行效率较低,反向分段法的平均运行时间为4.87 h,滑动窗口法的平均运行时间为29.82 h。该研究结果为今后在并行计算或分布式计算上开发近红外光谱预测模型的快速算法提供参考。     

化学跑合对齿轮胶合的影响

选用了３ 种跑合剂在ＣＬ－１００ 型齿轮试验机上进行满载跑合能力对比试验和齿轮抗胶合载荷级对比试验．结果表明：材质为４５＃ 钢的试验齿轮副和材质为２０ＣｒＭｎＴｉ钢的试验齿轮副用含磨料跑合剂进行１ 次满载跑合试验时,发生严重胶合;而采用化学跑合剂可以实现１ 次满载跑合,且用化学跑合剂跑合后的齿面比用普通油跑合后的齿面抗胶合能力提高１ 个载荷级,显示化学跑合剂在齿轮中的应用很有潜力．     

Skellam Type Processes of Order k and Beyond

In this article, we introduce the Skellam process of order k and its running average. We also discuss the time-changed Skellam process of order k. In particular, we discuss the space-fractional Skellam process and tempered space-fractional Skellam process via time changes in Skellam process by independent stable subordinator and tempered stable subordinator, respectively. We derive the marginal probabilities, Lévy measures, governing difference-differential equations of the introduced processes. Our results generalize the Skellam process and running average of Poisson process in several directions.     

Running Coupling Expansion for the Renormalized Φ 4 4 Trajectory from Renormalization Invariance

We formulate a renormalized running coupling expansion for theΒ-function and the potential of the renormalized Φ⁴-trajectory on four-dimensional Euclidean space-time. Renormalization invariance is used as a first principle. No reference is made to bare quantities. The expansion is proved to be finite to all orders of perturbation theory. The proof includes a large-momentum bound on the connected free propagator amputated vertices.     

Separation of diastereomers of a 1,3-disubstituted tetrahydro-β-carboline by capillary electrophoresis with β-cyclodextrin

Summary Capillary zone electrophoresis with -cyclodextrin as electrolyte additive has been investigated for the separation of the diastereomers of a 1,3-disubstituted tetrahydro--carboline. The effects of pH, buffer concentration, -cyclodextrin concentration and applied voltage on resolution were investigated. This study shows that optimizing the assay conditions leads to maximum chiral separation or resolution. The method enables further research on the quantitative analysis of these compounds.     

Collective behaviors of suprachiasm nucleus neurons under different light–dark cycles

The principal circadian clock in the suprachiasm nucleus(SCN) regulates the circadian rhythm of physiological and behavioral activities of mammals. Except for the normal function of the circadian rhythm, the ensemble of SCN neurons may show two collective behaviors, i.e., a free running period in the absence of a light–dark cycle and an entrainment ability to an external T cycle. Experiments show that both the free running periods and the entrainment ranges may vary from one species to another and can be seriously influenced by the coupling among the SCN neurons. We here review the recent progress on how the heterogeneous couplings influence these two collective behaviors. We will show that in the case of homogeneous coupling, the free running period increases monotonically while the entrainment range decreases monotonically with the increase of the coupling strength. While in the case of heterogenous coupling, the dispersion of the coupling strength plays a crucial role. It has been found that the free running period decreases with the increase of the dispersion while the entrainment ability is enhanced by the dispersion. These findings provide new insights into the mechanism of the circadian clock in the SCN.     

Mechanical and electrical streams in planets and stars

Empirical data about the latitudinal asymmetry of the geomagnetic field are used to obtain quantitative estimates of the westward geographic drift.     

Associated productions of the new gauge boson BH in the Littlest Higgs model with a SM gauge boson via e+e- collision

With the high energy and luminosity, the planned ILC has the considerable capability to probe the new heavy particles predicted by the new physics models. In this paper, we study the potential to discover the lightest new gauge boson BH of the Littlest Higgs model via the processes e+e- →γ(Z)BH at the ILC. The results show that the production rates of these two processes are large enough to detect BH in a wide range of the parameter spaces, specially for the process e+e- →γBH. Furthermore, there exist some decay modes for BH which can provide the typical signal and clean backgrounds. Therefore, the new gauge boson BH should be observable via these production processes with the running of the ILC if it exist.