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在 IBM4中,共有7条可能的群链,其中群链 U(36)U_6(sd)×U_6(ST)SU_3(sd)×SU_3(S)×SU_3(T)SU_3(sdS)×SU_3(T)O_3(J)×O_3(T)叫强耦合 SU(3)极限。在这种极限下,本文推出轻核中具有相同玻色子数的偶偶核和奇奇核构成一个同位旋多重态。另外,通过用群链 U(36)U_6(sd)×U_6(ST)SU_3(sd)×SU_2(S)×SU_3(T)SV_3(sdS)×SU_3(T)U(1)×SU(2)×O_3(T)标记的 T=0低能态波函数|[n]{n,0,…,0}(2n,0)(n,0)(λ,μ)∈∧∑;(00)0〉≡|[n](λμ)∈∧∑〉,得到强耦合 SU(3)极限的基带内禀态波函数 X([n](3n,0)k=0)=1/n!A_0~(+n)|0〉,再利用 Elliott 的方法,得到强耦合 SU(3)极限的基带波函数。 相似文献
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由于在轻核中质子与中子处于同一壳,当用相互作用玻色子模型(IBM)描述轻核时,必须引入同位旋.这时 IBM 就叫 IBM 4,系统的对称群为U_(36).它有七条群链,其中群链U_36(?)U_6(sd)×U_6(ST)(?)SU_3(sd)×SU_3(S)×SU_3(T)(?)SU_3(sdS)×SU_3(T)(?)O_3(J)×O_3(T)叫强耦合 SU(3)极限。由于 E2跃迁算符 T(E2)q 是由群 U_(36),V_6(sd),SU_3(sd),SU_3(s)与 SU_3(s dS)的生成元构成的,故不必构造出强耦合 SU(3)极限的波函数,利用 Elliott 波函数妒φ((λμ)KJM)就可以得到 E2跃迁. 相似文献
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本文讨论了按群链U_(36)U_6(sd)×U_6(ST)SU_3(sd)×O_6(ST)O_3(d)×O_3(S)×O_3(T)(?)O_3(J)×O_3(T)分类的IBM_4波函数,得到了具有SU(3)动力学对称性偶偶核(n=5)的典型能谱,并给出了一个具体例子:_(12)~(26)Mg_(14)。 相似文献
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《国外电子测量技术》2004,23(2):43-43,45
提供测试、测量和监测仪器的泰克公司日前宣布,推出最新的8GHz带宽数字存储示波器(DSO)系列,这一示波器具有业内领先的信号保真度,独有的Pinpoint^TM触发技术,四通道并发的高分辨率波形捕获通道,并提供了采用IBM的0.18um硅锗(7HP SiGe)技术的新型差分探头解决方案。 相似文献
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排汽焓是汽轮发电机组热经济性诊断必不可少的一个参数。通过汽轮机功率方程与灰色关联分析(grey correlation analysis,GCA)理论确定了模型的输入变量,利用万有引力搜索算法(gravitational search algorithm,GSA)优化了最小二乘支持向量机(least squares support vector machine,LSSVM)的惩罚因子μ以及核径向范围σ2个参数。通过比较分析,选用RBF_kernel为LSSVM的核函数。以GCA-GSA-LSSVM为基础,建立了预测汽轮机排汽焓的数学模型,并将其与BP神经网络、RBF神经网络进行对比,同时分析了该数学模型的鲁棒性。结果表明基于GCA-GSA-LSSVM的汽轮机排汽焓预测模型具有精度高、泛化能力强、鲁棒性强等优点,该方法为精确预测机组节能潜力提供了一种有力的工具。 相似文献
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(1)单路6位LVDS(低压差分信号)位接口单路6位LVDS位接口用来驱动6位液晶面板,使用单路方式传输RGB数据,也称18位(R、G、B各6位)LVDS接口。(2)双路6位LVDS接口双路6位LVDS接口用来驱动6位液晶面板,使用奇/偶像素双路方式传输RGB数据,也称36位图8LVDS发送电路集成在SCALER电 相似文献
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消除偶次谐波的三电平NPC逆变器调制方法 总被引:1,自引:0,他引:1
针对传统空间矢量脉宽调制(SVPWM)方法的矢量选取方案使得二极管箝位型(NPC)三电平逆变器输出电压产生偶次谐波的缺陷,提出了一种能消除偶次谐波的改进型矢量选取方案.该方案在分析传统SVPWM产生偶次谐波机理的基础上,通过改进SVPWM中各矢量的作用顺序,使得逆变器输出电压半波奇对称,从而达到消除偶次谐波、抑制中点电... 相似文献
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Hua Li 《Education, IEEE Transactions on》1992,35(1):44-49
An upper-level undergraduate 3-D computer graphics course using the IBM PC with an enhanced graphics adapter (EGA) or video graphics array (VGA) card was developed. Topics discussed in this course include three-dimensional viewing transformations, geometric transformations, animation, hidden line and surface removal, interpolations, and shading techniques. A broad coverage of computer graphics techniques and the easy accessibility of the IBM PC to a large number of students are the major features of the course 相似文献
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在 IBM4341计算机绘图系统几何接口(参数化绘图)中,将支撑软件与用户界面开发工具 GID 的方法用于轴流式水轮机叶型的 CAD 中,实现了转轮叶片的计算机图形自动设计与图形处理。 相似文献
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虚拟化技术日益成为关注的焦点,正在最大程度地改变企业 IT 基础设施的部署及运营。甘肃电力协同办公系统打破原有本部、各地市公司两级部署模式,采用大集中部署服务器的技术架构构建电力业务应用系统。 2 台 IBM p6 570 小型机采用逻辑分区技术(LPAR),将单台服务器划分成多个逻辑服务器,彼此运行独立的应用程序。逻辑分区技术在甘肃电力协同办公系统中的应用,不仅可以减少服务器的数量,通过降低空间、散热以及电力消耗等途径提供一种服务器整合的方法,节省成本投资;而且可以提高可用性,带来具有透明负载均衡、动态迁移、故障自动隔离、系统自动重构的高可靠服务器应用环境。 相似文献
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聚合物电解质燃料电池的研究进展 总被引:24,自引:3,他引:24
综述了聚合物电解质燃料电他(PEMFC)最新的研究进展,包括离子交换膜、膜电极结构及工艺、电催化剂、水和热管理.最后,对我国的PEMFC研究提出了意见. 相似文献
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《Electric Power Systems Research》2001,57(3):149-155
This paper presents a parallel methodology for composite reliability evaluation using Monte Carlo simulation by the state sampling approach. The methodology is based on coarse-grain parallelism, in which the adequacy analyses of the sampled system states are performed by different processors and the parallel process convergence is controlled by an asynchronous algorithm. The methodology was implemented on parallel and distributed processing environments: a ten-node IBM RS/6000 SP distributed memory parallel computer and a network of eight IBM RS/6000 43P workstations. The results obtained in tests with actual power system models show high speed-up and efficiency on both platforms and very good scalability. 相似文献
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Through analyses of the three transformations of IBM and the three management innovations of the State Grid Corporation of China (SGCC) and its consequential achievements, this paper condudes that the key to management is innovation. An enterprise can obtain core competitive advantages for sustainable development only if the innovation it makes is closely integrated with its management. Hereby SGCC has set up a good example for other state-owned enterprises to carry out innovational management. 相似文献
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IBMPC/AT采用80286微处理器,其指令执行速度快,计算能力更强,内存空间大,亦确定了微机温盘子系统的新标准,是个人计算机上的软件开发极好环境。由于使用不当及其他原因,PC/AT温盘子系统会出现无法引导系统文件。记录数据信息丢失,温盘存贮容量损失一半的现象。本文旨在从研究AT温盘子系统的生成出发,阐述了“坏死”温盘子系统如何激活。温盘存贮容量如何恢复等系统恢复的几种可行方法。 相似文献
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An introduction to a computer-aided design package called DF-PAK is presented. DF-PAK contains software modules for the design and analysis of digital filters and runs on the IBM personal computer (PC). These modules are based on established classical theories and can be integrated to serve a variety of educational needs 相似文献
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Borges C.L.T. Falcao D.M. Mello J.C.O. Melo A.C.G. 《Power Systems, IEEE Transactions on》2001,16(2):203-209
This paper describes two parallel methodologies for composite reliability evaluation using sequential Monte Carlo simulation. The methodologies are based on coarse grain asynchronous implementations. In the first methodology, a complete simulation year is analyzed on a single processor and the many simulated years necessary for convergence are analyzed in parallel. In the second methodology, the adequacy analysis of the system operating states within the simulated years is performed in parallel and the convergence is checked on one processor at the end of each simulated year. The methodologies are implemented on a 10 nodes IBM RS/6000 SP scalable distributed memory parallel computer and on a network of 8 IBM RS/6000 43P workstations. The results obtained in tests with actual power system models showed high speedup and efficiency on both parallel platforms 相似文献