图书馆虚拟参考咨询服务探索

在论述国内外虚拟参考咨询的发展状况和发展趋势的基础上,对如何开展虚拟参考咨询进行了初步探讨,并提出了在发展虚拟参考咨询过程中需要引起注意的几个问题。     

Quantum Switching Based on the Nearest Neighbor Hamiltonian

This paper describes a quantum switching architecture for nearest neighbor coupling.An efficient quantum shear sorting (QSS) algorithm is used to reduce the number of time steps.For the QSS algorithm,the running complexity of the quantum switching architecture is polynomial in time with the nearest neighbor coupling and the implementation is less complex.The result shows that improved switching is extremely simple to implement using existing quantum computer candidates.     

考虑加权排序的分类数据聚类算法

针对部分聚类算法对数据输入顺序敏感的问题,定义了不干涉序列指数,提出了应用不干涉序列指数对分类数据进行加权排序的方法,并基于该方法对受数据输入顺序影响的CABOSFV C分类数据高效聚类算法进行改进,提出了考虑加权排序的聚类算法(CABOSFV CSW),消除了算法对数据输入顺序的敏感性.采用UCI基准数据集进行实验,发现应用加权升序排序的CABOSFV CSW算法在处理分类数据时,聚类质量较原始CABOSFV C算法和其他受数据输入顺序影响的算法在准确性上有改善,在稳定性上有显著提高.     

教师课堂语言浅谈

课堂讲授是我国目前各级教育系统向学生传授知识的基本形式。课堂教学的好坏,不仅取决于教师的学术水平、教材的质量,在很大程度上,也取决于教师所运用的语言。教师职业旧时有个别称,叫做“吃开口饭的”,这就从一个侧面反映了教师职业的特征和教师所应当具有的职     

谈健美操课程在改善大学生体成分中的作用

通过健美操对人体运动能量消耗的分析,证实在高校开设健美操课程,可以促进大学生身体健康,塑造健美体形,有效改善大学生体成分,培养其终身体育锻炼的意识和习惯,提高他们终身体育锻炼的能力.     

沈阳,进入科技发展的“黄金时期”

春节刚过,从沈阳市科委计算机统计屏幕上,闪现出这样几组数:1994年实现高新技术产值95.13亿元,利税18.5亿元,与1991年相比,新增高新技术产值71.3亿元,新增利税14.7亿元;     

Efficient Scheme for Optimizing Quantum Fourier Circuits

In quantum circuits, importing of additional qubits can reduce the operation time and prevent decoherence induced by the environment. However, excessive qubits may make the quantum system vulnerable. This paper describes how to relax existing qubits without additional qubits to significantly reduce the operation time of the quantum Fourier circuit compared to a circuit without optimization. The results indicate that this scheme makes full use of the qubits relaxation. The concepts can be applied to improve similar quantum circuits and guide the physical implementations of quantum algorithms or devices.     

水热反应合成CuLxL(N)y及配体L(N)中氨基还原性研究

以2,2-联苯酸、联苯胺、乙二胺、对苯二胺等典型的含氮化合物为配体与Cu(Ⅱ)盐进行了水热反应合成了几种配合物CuLxL(N)y,其中L为2,2-联苯酸,L(N)为含氮化合物为配体,是联苯胺、乙二胺或对苯二胺等.通过元素分析,热重分析、IR分析等手段对配合物进行了表征;且研究了几种含氮配体在水热反应中的还原性.在水热条件下,NH2基团的还原性增强;以乙二胺中NH2的还原性最强,对苯二胺和联苯二胺次之,咪唑还原性最弱.     

Deterministic Teleportation Channel Using Bell State Measurements Only

Teleportation schemes based on probabilistic channels usually rely heavily on the implementation of high-dimensional unitary operations. Since high-dimensional unitary operations are very difficult to directly implement in physics experiments, methods are used to avoid high-dimensional unitary operations during the teleportation process. This paper describes how to construct a deterministic teleportation channel and a control channel using Bell state measurements only instead of high-dimensional unitary ope...