含铜低温热轧取向硅钢初次再结晶组织研究

为研究含铜低温热轧取向硅钢再结晶组织,采用3种不同的初次再结晶退火工艺进行热处理.结果表明,脱碳退火前的高温退火工艺有助于增加硅钢初次再结晶组织中20°～45°晶界比率;采用渗氮工艺,可在大幅提高∑5晶界比率的同时增大晶粒尺寸.应用晶粒尺寸阈值公式计算出的初次晶粒大小约为8μm,计算结果与试验数据相符.     

Comparison study of chitosan/β-cyclodextrin and carboxymethyl chitosan/β-cyclodextrin microspheres

To compare two microspheres of chitosan/β-cyclodextrin and carboxymethyl chitosan/β-cyclodextrin loaded theophylline as pulmonary sustained drug delivery carriers, the characteristics and ciliotoxicity were studied. The drug loadings of chitosan/β-cyclodextrin and carboxymethyl chitosan/β-cyclodextrin microspheres were 21.09% and 21.42%, and the encapsulation efficiencies were 91.40% and 92.80%. The distributions of 50% (d _0.5) of chitosan/β-cyclodextrin and carboxymethyl chitosan/β-cyclodextrin microspheres were 4.89 and 5.83 μm, respectively. Both microspheres showed spherical shape with smooth or wrinkled surfaces. FT-IR of chitosan/β-cyclodextrin microspheres demonstrated that theophylline had formed hydrogen bonds with chitosan and β-cyclodextrin, while for the carboxymethyl chitosan/β-cyclodextrin microspheres theophylline had interaction with carboxymethyl chitosan. The moisture absorption showed that an equilibrium was reached within 24 h. The two microspheres possessed better adaptability. In vitro release of theophylline from chitosan/β-cyclodextrin microspheres was slower than that from carboxymethyl chitosan/β-cyclodextrin microspheres at pH 6.8. Biography: LI Ruobao(1968–), male, Associate professor, research direction: foundation research of respiratory system.     

市政工程建设项目施工技术方案优化

文章针对工程建设项目施工技术方案的分类和内涵进行了定义论述，提出了施工技术方案优化的目的、原则、方法与程序。     

应用平台维护初探

信息技术的日新月异使得信息化进程大为加快，应用系统也面临着集中度高、重要性强的特点。如何能保证应用系统平稳高效运行成为一个重要的课题。文章仅从应用系统平台的方面来讨论如何加强管理。     

一种基于555集成电路的恒温器设计

文章通过对555电路的分析，结合双向可控硅和运放F007的特性进行恒温电路设计。     

科学发展观视域下的经济法探微

科学发展观是崭新的哲学理论，经济法是现代法律制度，虽然不在同一层次上，但是科学发展观与经济法具有一定的内在联系。科学发展观对经济法的立法、实施具有重要的指导意义，而经济法是实现科学发展观的主要制度性方法：     

高斯型Runge-Kutta方法研究

提出了一类高斯型Runge—Kutta公式的推导思想，并具体的给出了一个两点三阶高斯型Runge—Kutta公式，证明了高斯型Runge—Kutta公式的精度高于传统的对应的Runge—Kutta公式。     

一次同余式组的两种求解方法

运用矩阵的初等变换法和不定方程求解法,给出了求解同余式组的两种简便方法.     

大学生体育行为与心理健康关系的研究

对河南省部分高校大学生的体育行为和心理健康现状的调查结果表明，目前大学生的心理健康现状并不乐观，很多学生具有不同程度的心理障碍和潜在问题。经对体育行为与心理健康之间的相关性进行分析，针对存在的问题提出了可行性建议，希望能为高校构建健康教育体系提供理论依据。     

Applying File Information to Block-Level Content Addressable Storage

Content addressable storage (CAS) is a promising technology for improving storage efficiency as well as access throughput.Currently,many CAS products are implemented on the block level,which results in loss of file information.Thus,some sophisticated optimizations cannot be achieved,such as accurate fileprefetching.This paper presents a file-aware block-level storage system combined with the CAS function.In contrast with some existing file-level CAS,this system is transparent to upper-level applications,including the operating system and the file system.These features are achieved by using smart-disk technologies to help the storage system to learn the file-system layout.A prototype was implemented on an open-source virtual machine (VM) with the guest operating system being Windows XP.Tests show that this combination significantly reduces the size of the VM image file and improves the storage performance by discarding unused blocks and using a simple file-level prefetching strategy.