论思想政治理论课教学效益性原则

增强思想政治理论课教学的针对性、实效性，必须在教学过程中认真贯彻六个原则，即思想政治理论课教学的政治导向性、师生双向互动性、方法多样性、与时俱进时代性、实践性和各种资源力整合性原则。     

亿级人像比对系统架构设计及优化

为满足公安机关大规模人像数据库的比对应用需求,提高人像比对系统应用规模和可用性,采用结构化开发方法,从应用层、数据库层、主机层、存储层等方面对人像比对系统进行模块化架构设计和优化。系统能够支撑15亿以上人像比对库容量,实现了全国范围的人像自动比对和纠错,提高了身份辨认速度。系统平均建模速度、平均比对速度和查重速度分别提升38%、41%和55%。优化后的人像比对系统在保证识别率高的同时能够快速处理海量数据,满足公安机关应用需求,有效解决了户口登记管理中的“错、重、假”问题。     

动态复制管理多媒体服务器群集的可行性分析

应用动态复制策略研究多媒体演示文档的相交子集到一个服务器集群的多个节点问题。针对复制选定的演示文档以达到负载平衡,同时避免在每个节点上整个的复制多媒体文档,提出了针对目前动态分组策略的一个开发,创建了一个可配置的选定演示文档副本的最小数,以增加其可用性。这些额外的副本以允许负载平衡的方式被分配在多个节点,使得节点失效时可以被修复。通过分拆复制,实现来自复制的负载平衡,以提高单独演示文档的可用性,控制可用性和存储成本之间的权衡。运用组通信服务对节点间通信的原型多媒体服务器集群的性能测试,实验结果证明了开发策略的有效性、可行性。     

Low energy availability and low body fat of female gymnasts before an international competition

Abstract

The purpose of the present study was to evaluate dietary intake and body composition of elite rhythmic gymnastics (RG) athletes prior to a competition event. Sixty-seven rhythmic gymnasts (18.7 ± 2.9 years old) of high performance level, with 36.6 ± 7.6 h of training/week were evaluated in order to collect training and competition data, medical and gynaecological history, detailed dietary intake and body composition before an international competition. The majority of the participants (n = 40; 59.7%) had already menstruated, but age of menarche was delayed (15.3 ± 1.3 years) and all revealed menstrual irregularities. Gymnasts' body mass (48.4 ± 4.9 kg) and body mass index (BMI; 17.4 ± 1.1 kg/m²) were below the normal for age, and height (1.66 ± 0.05 m) was normal or even slightly above normal for age. Body fat was 9.0 ± 2.0% with no significant differences between age strata. Gymnasts exhibited low energy availability (EA; 31.5 ± 11.9 kcal/kg fat-free mass (FFM)/day). The average carbohydrate and protein intakes were 5.1 ± 2.3 g/kg/day and 1.6 ± 04 g/kg/day, which correspond to 51.4 ± 7.2% and 16.9 ± 3.4% of total energy intakes, respectively; average fat contribution was 33.0 ± 5.3%. Low intakes of pantothenic acid, folate and vitamins D, E and K and of minerals, including calcium, iron and magnesium were reported. Intakes of thiamine, riboflavin, niacin, vitamins A, B-6, B-12, C and manganese and zinc were above-adequate (P < 0.05). Low EA, low body fat and micronutrient deficiencies are common among RG.     

图书馆数据中心系统高可用性策略研究

认为在计算机技术和图书馆业务快速发展的今天,区域中心图书馆应高度重视数据中心建设。通过分析图书馆数据中心安全保障需求,提出配电系统、存储系统、网络系统、服务器系统、数据库系统以及应用软件系统的高可用性策略;构建高可靠、高可用的整体系统架构。     

在思想品德课中进行情境体验式教学的实践探析

在思想品德课中开展有效的情境体验式教学实践活动,应当严格遵循情境创设的基本原则。从整个教学过程看,教师除了需要充分利用丰富的课程资源进行合理的“设境”和“呈境”之外,积极引导学生自主参与情境体验式教学还必须经历“赏境-入境-悟境”三个基本环节,而这也构成了当前思想品德课情境体验式教学的有效实践模式。     

高职院校课程管理有效性探究

当前,高职院校课程改革正在如火如荼地进行,但成效却不尽如人意。通过对课程管理内涵有效性的分析,在探析制约课程管理有效性主要因素的基础上,提出提高课程管理有效性的必要途径。     

Availability and toxicity of Fe(II) and Fe(III) in Caco-2 cells

The objective of the present study was to compare the toxicity and availability of Fe(II) and Fe(III) to Caco-2 cells. Cellular damage was studied by measuring cell proliferation and lactate dehydrogenase (LDH) release. The activities of two major antioxidative enzymes [superoxide dismutase (SOD) and glutathione peroxidase (GPx)] and differentiation marker (alkaline phosphatase) were determined after the cells were exposed to different levels of iron salts. The cellular iron concentration was investigated to evaluate iron bioavailability. The results show that iron uptake of the cells treated with Fe(II) is significantly higher than that of the cells treated with Fe(III) (P<0.05). Fe(II) at a concentration >1.5 mmol/L was found to be more effective in reducing cellular viability than Fe(III). LDH release investigation suggests that Fe(II) can reduce stability of the cell membrane. The activities of SOD and GPx of the cells treated with Fe(II) were higher than those of the cells treated with Fe(III), although both of them increased with raising iron supply levels. The results indicate that both Fe(II) and Fe(III) could reduce the cellular antioxidase gene expression at high levels. Project supported by the International Cooperative Project from the Ministry of Science and Technology of China (No. 2006DFA31030), the Bureau of Science and Technology of Zhejiang Province (No. 2006C32019) and HarvestPlus-China (No. 8022), and the Program for Changjiang Scholars and Innovative Research Team in University of China (No. IRT0536)     

“国培计划”政策实施的有效性研究——以我校的国家级音乐骨干教师培训为例

提升教师素质,促进教师专业发展是教师培训的核心。通过对国家级音乐骨干教师培训在政策执行过程的实践研究,分析其存在的一些问题并提出改进措施,为进一步完善教师培训政策提供决策依据。