度量空间的弱开cs-映象

给出了度量空间的弱开cs-映象的一种刻画.     

英汉空语类的句法分布探究

空语类由乔姆斯基于上个世纪八十年代初提出,立刻引起了各国语言学者的密切关注。深入了解和探讨空语类及其在英汉语言中的句法分布,对揭示英汉语言的句法特征起着至关重要的作用,同时也检验了普遍语法原则,并为更好地解释汉语的语法现象提供了新的视角。     

A quadratic programming method for optimal degree reduction of Bézier curves with G1-conitnuity

This paper presents a quadratic programming method for optimal multi-degree reduction of Bézier curves with G1-continuity. The L2 and l2 measures of distances between the two curves are used as the objective functions. The two additional parameters, available from the coincidence of the oriented tangents, are constrained to be positive so as to satisfy the solvability condition. Finally, degree reduction is changed to solve a quadratic problem of two parameters with linear constraints. Applica     

产学研相结合建设多模式实训基地

高职教育建立产学研相结合的多模式的校内外实训基地，是以学为主体。学产结合。理论与实践相互联系；以研为源头，学研结合，教学与科研相互促进；以产为主导，研产结合。项目开发与成果相互转化。     

一束质文并茂的古体诗作--唐庆华同志《诗伴我行》鉴赏札记

唐庆华古体诗作在题材、主旨、情景、理趣以及语言技巧等方面均有独到的表现功力,他的诗作在保持诗歌传统的同时,做到了与时俱进、不断革新,对古体诗歌在现今时代的流变做了有益的尝试,这对彰显民族文学精华,启迪后来才学追求颇有稗益.     

黄芪成分F_3新制剂对胃癌细胞株的抑制作用

[目的]观察黄芪成分F3新制剂对胃癌(BGC-823)细胞株体外细胞生长、抑制作用.[方法]利用基因组DNA电泳,流式细胞仪检测细胞凋亡.[结果]基因组DNA电泳出现“梯形”条带;流式细胞仪分析出现低于G1期DNA含量的亚二倍体凋亡率.[结论]黄芪成分F3新制剂对胃癌细胞有明显的抑制作用.     

Unity3D下构件化虚拟仪器功能实现方法

三维虚拟现实漫游仿真和虚拟仪器实验过程仿真是目前两种主要仿真手段,前者能够很好地模拟真实实验场景,后者则能更好地仿真实验细节。为了解决传统虚拟实验交互性弱、开发周期长等问题,提出了一种Unity3D下的构件化虚拟仪器功能实现方法。首先在Unity3D平台上开发多种标准化、可复用的虚拟仪器;然后将虚拟仪器引入虚拟现实场景中,并通过基于事件中心的观察者模式实现虚拟仪器的通信和数据流动;最后,依据构建的虚拟仪器开展典型机械工程测量实验。结果表明,与传统虚拟实验相比,该方法具有更好的真实性、交互性,同时构件化的思想缩短了开发周期。     

Synthesis of 3-O-Benzoyl-1,2- O-isopropylidene-α-D-allofuranose and Its Dimesylated Derivative

Diisopropylidenated α-D-glucofuranose (1) was oxidated with CrO3-pyridine complex.Oxidated product and its hydrate were separated and were reduced together to synthesize diisopropylidenated α-D-allofuranose (3). The yield of 3 increased by 8% than that with only oxidated product as reduction substrate. Benzoylated derivative of 3 was selectively hydrolyzed and dimesylated to synthesize 3-O-benzoyl-1,2- O- isopropylidene-α-D-allofuranose (5) and its dimesylated deriva tive respectively. The overall yield of 5 from 1 was 36%. Each step and final products were anal yzed by 1H-NMR spectra and other methods. The experiments showed that the influence of acetic acid concentration on selective hydrolysis was obvious. The hydrolysis yield was 81.8%. Oxidation, reduction and other procedures were practical and had application potential.     

水杨醛甲胺磷合铜(Ⅱ)配合物稳定常数测定

用pH法测定了水杨醛甲胺磷席夫碱合铜 (Ⅱ )配合物的稳定常数 ,K =4 .2× 10 14 ,说明该配合物是稳定的。     

腰椎椎骨骨性管道与腰椎管狭窄症的解剖学基础

目的:研究脊椎骨性管道为治疗椎管狭窄症提供解剖学基础。方法:用不同尸材19具,解剖出第四腰椎,观察测量其矢状径的大小。结果:19块椎骨管径在14.5mm-17.9mm之间,平均为(17.0±0.41)mm。结论:国人矢状径平均17.0mm,15mm为临界值,12mm以下为狭窄。