构建个性化BASH SHELL环境

Shell是允许Linux用户输入命令的界面.本文讨论在基于ANSI兼容终端里,通过对Sheu内置的系统变量的设置,定制个性化的用户登录环境.     

三倍体西瓜种子催芽技术新探

将观察三倍体西瓜籽发芽率的不同时段视为时间裂区 ,套裂区试验的方差分析模型对 4种不同处理方法催芽的试验结果进行了分析 ,发现剪壳法处理后的种子不仅发芽速度显著地超过其它处理 ,而且成苗率高达 91.4% ,是改进目前常规催芽技术的有效方法。     

聚合物稀溶液环流同轴电纺制备药物零级控释纳米纤维

研究了应用聚合物稀溶液环流同轴电纺制备药物零级控释纳米纤维.以聚丙烯腈(PAN)为成纤聚合物,以阿昔洛韦为药物模型,并以2%(质量/体积)的PAN稀溶液为鞘液实施同轴电纺工艺,制备芯鞘结构载药纳米纤维.通过电镜观察,纳米纤维具有线性形貌和芯鞘结构特征;X-射线晶体衍射结果证明,阿昔洛韦以无定形态存在于PAN基材中;体外溶出实验结果表明,芯鞘纳米纤维能够消除药物初期爆释效应,调控近80%的药物零级方式释放.     

Shell condition and adequacy of three sympatric intertidal hermit crab populations

Shell use in relation to size adequacy and presence of physical damage and encrustation was evaluated and compared among and within three co-existing species of intertidal hermit crab (Clibanarius antillensis, C. sclopetarius and C. vittatus) in the intertidal region of Pernambuco Islet, São Sebastião Channel, south-eastern Brazil. Comparisons of shell utilization patterns among species and sexes were made with respect to physical damage (perforations and breakage in aperture and apex), encrustation by other organisms and shell size adequacy. Two adequacy indices were calculated. The visual adequacy index (VAI) was based on the degree of hermit crab retraction into the shells (1 = crab totally retracted and 6 = shield exposed). The shell adequacy index (SAI) was calculated through a comparison of the weight of the used versus the preferred shell. A relationship was found between VAI and SAI with crabs assigned as VAI = 3 occupying optimal shells (SAI = 1), i.e. crabs that could retract and those that could not retract the whole body into shells were in relatively heavier and lighter shells than the preferred ones, respectively. Shells utilized by the hermit crabs were generally undamaged and highly encrusted (except for C. antillensis) by oysters, barnacles and green algae, features that may reduce the risks of desiccation and predation. The frequent damage to the shell apertures was associated with a high abundance of shell-crushing predators in the studied area. The degree of encrustation as well as the shell adequacy (VAI and SAI) showed intra- and interspecific variation, while the presence of damage differed only among sexes (reproductive classes). In general, the smallest individuals in the populations used relatively heavier shells. Fecundity of the crabs of this assemblage is thought not to be limited by shell use once ovigerous females are occupying optimal shells.     

原子结构壳层模型的近似性

本文通过对波函数、原子能量、辐射跃迁等方面的讨论，分析了原子结构壳层模型的近似性。     

柱壳结构弹塑性稳定性分析的半解析有限元法

对圆柱壳结构在承受外压作用下发生失稳屈曲的研究,几何方程采用大位移的应变位移关系,物理方程采用弹塑性分析的应力应变关系,导出了圆柱壳单元弹塑性分析的切线刚变矩阵。计算中,为了追踪失稳屈曲完整的平衡路径,在位于极值点邻城内的每一增量步中,我们采用控制弧长约束下的增量——迭代法进行计算,使计算效率大大提高。     

表面δ力与1P_(1/2)-1P_(1/2)和2S_(1/2)-2S_(1/2)壳层原子核结合能

本文用表面δ力(SDI)作为有效相互作用,计算了壳层原子核的结合能,计算结果与实验符合的相当好。说明在这两个壳层中包括非单满壳层的原子核用表面δ力来处理仍很成功。     

川中八角场大安寨凝析气藏储层特征

川中八角场大安寨组介壳灰岩储集空间由成岩微缝、晶间缝、溶孔和构造微缝组成,以成岩微缝为主,其次为晶间缝和微溶孔、缝,构造缝主要起渗滤通道作用。低孔低渗、微孔喉为主、大孔隙表面积和亲油性决定其主要成为储气层,并控制着凝析气藏的聚集、油气分布、开采中产能及油气性质的变化。气藏外圈东南部向斜溶孔发育,成为储油层。     

我国上市公司"壳资源"广义期权价值分析

我国上市公司的"壳资源"从其经济实质上将是一种广义的期权,上市公司的控股公司通过对其他股东行使广义期权,频繁配股增发,不分或少分红利,取得巨大的经济效益.适度的广义期权存在对于股市的发展是有利的,但是我国的广义期权效应却是过度的,严重阻碍经济的发展.     

用UNIX Shell脚本设计CGI程序的方法

通过对ＷＷＷ访问计数程序分析，介绍了用ＵＮＩＸＳｈｅｌ脚本设计ＣＧＩ程序的方法，分析了表单处理过程中两种参数传递方式的区别和联系，介绍了能自适应两种参数传递的ＣＧＩ程序的设计方法，同时讨论了其潜在的安全性问题及解决途径．