线性规划应用中的优值调整(续)

三、在理解最优解对应的目标函数值的基础上。逐步调整目标函数值,并以此为条件,代入线性约束条件消元。通过解不等式(组),先求出x或y的范围,再求出实际最优解例3 某人有楼房一幢,室内面积共180m2,拟分隔成两类房间作为旅游客房,大房     

第七次亚洲及太平洋地区物理会议简讯

第七次亚洲及太平洋地区物理会议简讯￥中国科学院高能物理研究所＠沈建平第七次亚洲及太平洋地区物理会议简讯第七次亚洲及太平洋地区物理会议（Ｔｈｅ７ｔｈＡｓｉａＰａｃｉｆｉｃＰｈｙｓｉｃｓＣｏｎｆｅｒｅｎｃｅ，简称７ＡＰＰＣ）于１９９７年８月１９日至２３日在北京...     

基于教育基金保险的期权定价

本文基于文献[1]引入一种基于教育年金保险的欧式看涨期权,它赋予合约持有人在约定时间以约定价格购买一份连续支付一定年限的教育年金的权利,本文运用保险精算和期权定价的二叉树方法对其进行的定价,并说明这种合约方便于一些低收入家庭进行教育投资.     

势阱中超冷三能级原子的自发辐射

考虑到在势阱中温度为μK量级的超冷原子质心运动的量子效应,发现原子的自发辐射谱表现出特殊的性质.本文采用全量子理论求解了考虑质心运动量子效应后囚禁在平方势阱中Λ型三能级原子的动力学方程,得到了一阶和二阶含时微扰理论的处于不同能级上的几率谱.研究结果表明:在基质心运动态的初始条件下,无论在二能级还是三能级模型下起始处于激发态的原子,它们的自发辐射谱都出现了多峰结构,这是由于原子质心运动的量子效应引起的.在一阶微扰情况下,与采用标准量子理论得到的结果一致,即处于激发态的原子最后完全自发辐射到基态;而在二阶微扰情况下,起始处于激发态的三能级原子,最后还有一定的几率处于激发态,这个几率和势阱的振动频率、原子两个下能级之间的能差和反冲参数等有关.分析表明原子最后处在激发态上的几率不为零是由于从激发态自发辐射到不同基态过程中出现了量子干涉现象.     

One- and Two-Dimensional Arrays of Double-Well Optical Traps for Cold Atoms or Molecules

We propose a novel scheme to form one- and two-dimensional arrays of double-well optical dipole traps for cold atoms (or molecules) by using an optical system composed of a binary π-phase grating and a lens illuminated by a plane light wave, and study the relationship between the maximum intensity Imax of each optical well (or the maximum trapping potential Umax for ^85Rb atoms) and the relative aperture β (= α/f) of the lens. We also calculate the intensity gradients of each optical well and their curvatures, and estimate the spontaneous photon-scattering rate of trapped atom in each well, including Rayleigh and Raman scattering rates. Our study shows that the proposed 1D and 2D arrays of double-well traps can be used to prepare 1D and 2D novel optical lattices with cold atoms (or molecules), or form an all-optically integrated atom optical chip, or even to realize an array of all-optical double-well atomic (or molecular) Bose-Einstein condensates by optical-potential evaporative cooling, and so on.     

Single-frequency, single-polarization ytterbium-doped fiber laser by self-injection locking

We demonstrated a stable single-frequency, single-polarization operation of ytterbium-doped fiber laser. As a novel practical method to realize single-polarization operation of fiber distributed Bragg reflector (DBR)laser, we proposed self-injection locking (SIL) with an active fiber ring feedback cavity. The laser has high output power exceeding 15 mW, wavelength of 1053.20 nm, and side-mode suppression ratio greater than 60 dB. The SIL fiber laser shows the improvements in output power and side-mode suppression compared with the fiber DBR laser. No mode-hopping is observed within 2 hours.     

弹道终端飞机目标红外图像瞄准点识别方法

依据飞机目标红外图像的特点,将飞机机头选定为跟踪瞄准点。利用弹道终端目标未充满视场前的红外序列图像、视场中心角、弹目距离等,建立了弹体坐标系下飞机轴线方向的求解模型。采用MAT、Hough变换等技术,对目标充满视场后的红外序列图像进行处理,检测出了飞机轴线,识别出了飞机机头。利用从弹道终端的两个序列图像中抓取出来的四帧红外图像进行了仿真,并给出了实验结果。     

Clustering study in Eu(DBM)_3Phen-doped polymer optical fibers by optical properties and near-field scanning microscopy

There has been an increasing interest in rare-earth-dopedpolymer optical fiber (POF) because of its applicationsin optical communication systems and optical sensors,especially in local networks and data communications[1].In recent years, much work has been done on rare-earth-doped POFs, such as Nd3+, Eu3+, Sm3+, Er3+-dopedPOFs[2-5]. Amplified spontaneous emission (ASE) wasfound in Nd3+-doped POFs[2] and Eu3+-doped gradedindex POFs[6]. However the clusters of rare-earth ionsexist in t…     

等离子体引发聚合及其应用

系统介绍了等离子体引发聚合的方法，特点，着重介绍等离子体引发聚合在超高分子量聚合物的合成，嵌段聚合，接枝聚合及无机高分子，单晶聚合物合成等方面的应用研究成果。     

具有隐私保护的RFID标签读取系统

在不增加RFID标签成本和用户私人信息管理成本的前提下，提出了一个具有个人信息保护功能的新的系统结构．利用现有的RFID硬件，通过对信息的加密和策略管理，使系统自动、实时地对用户的个人信息进行权限控制和保护，从而加强对用户私有信息的管理和保护，提高用户对商家的信任度和忠诚度。