激光印字机的汉字输出与仿真

在激光印字机的汉字输出过程中有两个突出问题需要解决:一是每页信息容量大与控制器内部存贮器空间小的矛盾,二是输出速度高与微机指令执行速度慢的矛盾。 本文围绕着这两个问题,讨论控制器总线的驱动,数据流动路径的选择,软件写入与硬件读出的两个行存贮器结构及控制器的实时仿真等问题。     

Optimal control of a finite dam with a sample path constraint

In this paper, we discuss the 2-stage output procedure of a finite dam under the condition that water must be released by a fixed time. From this standpoint, the reservoir model we consider is subject to a sample path constraint and has a more general cost function than the earlier contributions. We analytically derive explicit formulas for the long-run average and the expected total discounted costs for an infinite time span and numerically calculate the optimal control policy. Finally, the optimal policy is compared with one by Zuckerman [1] and the effect of the fixed release time is discussed further.     

长毛对虾高产养殖试验

为了摸索长毛对虾高产养殖技术,1990年在12口虾塘、40.lhm~2的养殖面积中,对影响长毛对虾养殖产量的各种因素进行了试验,经过四个月的生产养殖,获得最高公顷产1443kg。平均公顷产993kg。本文着重总结了该次生产试验的结果。     

A 1.2 to 6 keV soft X-ray beamline at Beijing Synchrotron Radiation Facility

A new soft X-ray beamline with double-crystal monochromator and double direction focus has been constructed at Beijing Synchrotron Radiation Facility (BSRF). The beamline covers the soft X-ray energy range from 1.2 keV up to 6 keV. There are three pairs of crystals (Si (111), InSb (111), KTP(011)) for the monochromator, separately. The performance of the crystals in respect to flux, resolving power and higher orders is discussed, and some representative results from the beamline are given. The beamline is used for a variety of experiments, for example, calibration detector, measurements of optics element characteristics and soft X-ray spectroscopy (SXS).     

熔融碳酸盐燃料电池研究

以烧结Ｎｉ作电极，以ＬｉＡｌＯ２无机膜作电池隔膜，组装成了电极而积２８ｃｍ＾２的小型熔融碳酸盐燃料电池，试验了各种工作条件对电池性能的影响，电池经多次启动性能无衰减，放电电流密度１００ｍＡ／ｃｍ＾２，电池电压０．９５Ｖ，放电电流密度１２５ｍＡ／ｃｍ＾２，电池输出功率１１４ｍＷ／ｃｍ＾２，燃料气利用率８０％，电池能量效率３１％。     

Non-manifold surface reconstruction from high-dimensional point cloud data

We present an algorithm capable of reconstructing a non-manifold surface embedded as a point cloud in a high-dimensional space. Our algorithm extends a previously developed incremental method and produces a non-optimal triangulation, but will work for non-orientable surfaces, and for surfaces with certain types of self-intersection. The self-intersections must be ordinary double curves and are fitted locally by intersecting planes using a degenerate quadratic surface. We present the algorithm in detail and provide many examples, including a dataset describing molecular conformations of cyclo-octane.     

The cryogenic control system of BEPCⅡ

A superconducting cryogenic system has been designed and deployed in the Beijing Electron-Positron Collider Upgrade Project(BEPCⅡ).The system consists of a Siemens PLC(ST-PLC,Programmable Logic Controller)for the compressor control,an Allen Bradley(AB)PLC for the cryogenic equipments,and the Experimental Physics and Industrial Control System(EPICS)that integrates the PLCs.The system fully automates the superconducting cryogenic control with process control,PID(Proportional-Integral-Differential)control loops,real-time data access and data storage,alarm handler and human machine interface.It is capable of automatic recovery as well.This paper describes the BEPCⅡ cryogenic control system,data communication between ST-PLC and EPICS Input/Output Controllers(IOCs),and the integration of the flow control,the low level interlock,the AB-PLC,and EPICS.     

A note on a family of proximal gradient methods for quasi-static incremental problems in elastoplastic analysis

Accelerated proximal gradient methods have recently been developed for solving quasi-static incremental problems of elastoplastic analysis with some different yield criteria. It has been demonstrated through numerical experiments that these methods can outperform conventional optimization-based approaches in computational plasticity. However, in literature these algorithms are described individually for specific yield criteria, and hence there exists no guide for application of the algorithms to other yield criteria. This short paper presents a general form of algorithm design, independent of specific forms of yield criteria, that unifies the existing proximal gradient methods. Clear interpretation is also given to each step of the presented general algorithm so that each update rule is linked to the underlying physical laws in terms of mechanical quantities.     

LHCD系统微波激励源性能优化设计

使用数字锁相环技术实现一定带宽内高精度可调节的频率输出,解决了速调管长期工作后响应频率发生偏移,模拟锁相环无法工作在系统最佳频率的问题;在移相器后增加功率幅度控制电路,保证了线性放大器的输出功率不会受到相位调节的影响;设计了一种基于数模转换(D/A)技术与微波电调技术相结合的波形控制单元,解决了激励源输出波形不可控的问题。通过以上三方面的改进,完成了HL-2M装置LHCD系统微波激励源的性能优化设计。     

Determination of the analytical parametric relationship for output spectrum of Volterra systems based on its parametric characteristics

The output frequency response function (OFRF) of Volterra systems can be described as a polynomial function of model parameters. However, the analytical determination of the OFRF is very computationally intensive, especially for higher order OFRF. To circumvent this problem, a numerical method can be adopted, provided that a series of simulation or experimental data for this polynomial function are given. In this study, it is theoretically shown that the analytical parametric relationship of OFRF up to any order can be determined accurately by using a simple Least Square method and every specific component of the output spectrum can also be determined explicitly, based on the OFRF's parametric characteristics. Practical techniques to obtain a unique and accurate solution for the Least Square method are discussed. This study provides a fundamental result for the determination of the analytical parametric relationship for this kind of system polynomial functions by using numerical methods.