物流专业生产性实训基地现状及问题分析

通过分析职业院校物流专业实训教学现状,针对物流专业实训教学存在的问题,提出了教学地点工作场所化、实训场所教学化的观点。结合筹建学校物流实训基地的实际情况,详细阐述了职业院校物流实训的建设目标、物流实训场所教学化的实现途径。     

基于PIC18F的医疗超声诊断仪备用逆变电源研制

逆变电源采用AC-DC-AC可控整流加单相逆变的变换模式,以PIC18F1330处理器作为核心控制器件,产生逆变电路所需的SPWM驱动信号,同时完成稳压、过压保护、欠压保护、过载保护及温度保护等功能。所设计的备用逆变电源具有电压稳定、畸变小等特点,经实际使用符合医疗超声诊断仪等医疗设备应急供电的要求,具有很高的实用价值。     

应用型本科课程考试改革与实施探究

应用型本科教育是我国近十年来发展十分迅速的一种新型高等教育模式,已成为我国高等教育大众化的主要承担者.但是,受到传统应试教育的影响,应用型本科的课程考试与应用型人才培养目标的实现相脱节,以沈阳理工大学应用技术学院为例,针对金属学及热处理课程的考试改革及实践进行探讨,以期对我国考试改革有所借鉴.     

日常经验和集体记忆之下的接受快感——试论国产电视剧的文化亲和力

自20世纪90年代以来,我国的电视剧艺术市场有了长足的发展和进步,不仅产生了一系列引人注目的电视剧,而且引发出一连串的文化热点和谈论话题。国产电视剧业已成为当代中国人日常文化生活的重要组成部分,建构起了中国当代影视文化的一个重要景观,它包蕴着中国人对社会文化现实的感悟及思考,并有着境外影视无法替代的意义——所具有的文化亲和力。     

学习兴趣转变,研究生教育改革刻不容缓——基于学习者利益的视角

目前研究生教育正在面临着学习者兴趣变化的巨大挑战。研究生学习兴趣变化主要体现从重视理论知识学习转向注重应用实践能力的提高上。这些变化既是社会发展需要的反映,同时也是就业压力的反映。研究生教育必须根据学习者学习兴趣的变化而进行适时的调整,把培养重心转向实践应用能力提高上。这一调整是提高研究生教育质量的根本对策。     

流动儿童城市适应状况及过程——一项质性研究的结果

采用质性研究方法对流动儿童城市适应状况及过程进行了探讨。对21名流动儿童深度访谈的结果发现:受访流动儿童城市适应状况较好;流动儿童城市适应过程呈现三种类型:U型、J型、水平线型;长期习得的外显行为、内隐观念、人文环境、学习成绩是几个较难适应的维度。在对三种适应过程进行比较后,提出了流动儿童的城市适应过程理论,认为流动儿童在城市适应过程中会经历四个发展阶段:兴奋与好奇、震惊与抗拒、探索与顺应、整合与融入。与以往研究结果相比,更全面、更清晰地描述了流动儿童城市适应状况,首次提出了流动儿童城市适应发展阶段理论,本研究对实践具有较好的指导意义,但结果的推广性还略显不足,需通过后续研究进行弥补。     

Treatment and hydraulic performances of the NiiMi process for landscape water

This paper describes the NiiMi process designed to treat landscape water. The main aim of the research was to investigate the feasibility of NiiMi for removing organic and nutriment materials from landscape water. During the batch-scale NiiMi operation, the removal rates of color ranged from 66.7%o-80% , of turbidity from 31.7%-89.3%o, of chemical oxygen demand （COD） from 7%-36.5%, of total phosphor （TP） from 43%-84.2%, of soluble phosphate from 42.9%-100%, of total nitrogen （TN） from 4.2%-46.7%, and of NH4^＋-N from 39.3%-100% at the hydraulic loading of 0.2 m^3/（m^2·d）. Results showed that the removal efficiencies of COD, TP, soluble phosphate and TN decreased with the decline in the temperature. The NiiMi process had a strong shock loading ability for the removal of the organics, turbidity, TP, soluble phosphate, TN and NH4^＋-N. Three sodium chloride tracer studies were conducted, labeled as TS 1, TS2, and TS3, respectively. The mean hydraulic retention times （mean HRTs） were 31 h and 28 h for TSI and TS2, respectively, indicating the occurrence of a dead zone volume of 12% and 20% for TS 1 and TS2, respectively. TS 1 and TS2 displayed the occurrence of short-circuiting in the NiiMi system. The comparison results between TS1 and TS2 were further confirmed in the values obtained for some indicators, such as volumetric efficiency （e）, short-circuiting （S）, hydraulic efficiency （2） and number of continuously stirred tank reactors （N）.     

Effect of the geometric shapes of specimens on impact tensile tests

The geometric shapes of specimens are important in impact tensile tests because geometric shapes determine the stress states of the specimens, and precise geometric shapes can obtain proper material properties without non-material factors. The aim of this study was to investigate the 1D form of the stress by changing the length-to-diameter （L/D） ratios of specimens. The experiments were carried out on a split Hopkinson tensile bar （SHTB）-rotating disk indirect bar-bar tensile impact apparatus. The L/D ratios of the LY12CZ specimens used in the test ranged from 1 to 5. Results show that the specimens can be used to obtain exact parameters of materials under the proposed conditions when the L/D ratio is greater than 2. This is because the longer length will reduce or eliminate the effects of the interfaces.     

HNCO hydrolysis performance in urea-water solution thermohydrolysis process with and without catalysts

The thermolysis of urea-water solution and its product, HNCO hydrolysis is investigated in a dual-reactor system. For the thermal decomposition below about 1073 K, the main products are ammonia (NH3) and isocyanic acid (HNCO) whereas at higher temperatures the oxidation processes take effect and the products include a low concentration of nitric oxide (NO) and nitrous oxide (N2O). The gas HNCO is quite stable and a high yield of HNCO is observed. The ratio of NH3 to HNCO increases from approximately 1.2 to 1.7 with the temperature. The chemical analysis shows that H radical is in favor of HNCO hydrolysis by instigating the reaction HNCO+H·→·NH2+CO and high temperature has positive effect on H radical. The hydrolysis of HNCO over an alumina catalyst made using a sol-gel process (designated as γ-Al2O3) is investigated. The conversion of HNCO is high even at the high space velocities (6×105 h-1) and low temperatures (393–673 K) in the tests with catalysts, which enhances HNCO hydrolysis and raises the ratio of NH3 to HNCO to approximately 100. The pure γ-Al2O3 shows a better catalytic performance than CuO/γ-Al2O3. The addition of CuO not only reduces the surface area but also decreases the Lewis acid sites which are recognized to have a positive effect on the catalytic activity. The apparent activation energy of the hydrolysis reaction amounts to about 25 kJ/mol in 393–473 K while 13 kJ/mol over 473 K. The overall hydrolysis reaction rate on catalysts is mainly determined by external and internal mass-transfer limitations.     

发挥高校科研实验室作用,加强大学生创新能力培养

以培养大学生创新能力为切入点,探讨高校科研实验室利用自身优势承担大学生创新实验的基本思路,阐述高校科研实验室在大学生创新能力的培养中的作用,并且提出要进一步发挥其作用,加强大学生创新能力的培养.