骨炭吸附去除溶液中砷的研究

采用骨炭作吸附剂,通过静态和动态吸附试验,研究了其对饮用水中砷的脱除效果及其影响因素,以及骨炭反复吸附一解吸一再生一再吸附后性能的稳定性.结果表明,骨炭能够高效除砷.骨炭吸附砷符合Langmuir和Freundlich等温吸附模型.吸附柱的饱和吸附容量为4.688 mg/g,饮用水出水砷浓度符合世界卫生组织(WHO)规定的饮用水标准(As<0.01 mg/L),说明骨炭除砷具有很好的应用前景.     

六相双定子螺旋运动永磁执行器数学模型研究

针对新型机器人多自由度运动机构的需求,提出了一种新型六相双定子螺旋运动永磁执行器。执行器特点在于每个定子均为六相双Y移30°绕组,两个定子铁心采用螺旋形齿槽结构,对两个定子绕组通入六相不同相序电流组合便可产生多自由度运动方式。执行器具有控制方式灵活、容错性能强、可靠性稳定等优点。首先对螺旋运动永磁执行器的结构及运行机理进行分析,推导了执行器的磁链方程、电压方程、转矩和推力方程。最后构建了瞬态三维多自由度数值分析模型,得到了磁链、电压、转矩和推力的波形,验证了运行机理的正确性。     

三色线阵CCD高速信号处理系统的优化设计

为提高线阵CCD测量系统的测量精度和抗干扰性能同时保证系统信号处理速度,总结并试验了几种常见的CCD信号处理方案,并提出对应优化设计。阐述了线阵CCD传感器、CCD驱动电路的工作原理,着重分析研究了CCD测量系统中的信号采样和处理过程。详述了CCD输出电压特性,分压电路、滞回比较电路工作原理和MCU采样时序。试验结果表明,相比传统使用单比较器的方案,使用多滞回比较器的设计系统精度得到大幅提升,同时抗干扰性能也得到更好的保证。该设计已应用到印刷行业的纠偏控制器中。     

光学元件亚表面损伤深度的无损荧光检测方法

为了实现光学元件亚表面损伤的低成本、快速、准确检测,提出一种光学元件亚表面损伤深度无损荧光检测方法.在研磨和抛光加工过程中添加纳米荧光量子点溶液作为标记物,量子点受到激发光辐照后能够产生荧光现象,然后利用激光共聚焦显微镜进行逐层扫描以获取被测样品不同深度处的切片图像,当扫描深度达到某一特定值时,荧光强度开始由强变弱,通过特征点荧光强度的变化最终确定光学元件的亚表面损伤深度.自行开发了亚表面损伤深度无损检测软件,检测软件具有图像阈值处理、亮点自动识别、图像显示和曲线表征等功能,可以实现光学元件亚表面损伤深度的快速无损检测.将无损检测结果与损伤性检测结果进行了对比分析,结果表明两种检测方法相对误差在10%以内,验证了提出的无损荧光检测方法的有效性.     

良好设施 科学规范化管理的必要性

江西省药物研究所于2008年建立了实验动物屏障设施,同年八月取得《实验动物使用许可证》,现已正常运行两年,由于我们严格按照屏障系统设施标准操作规范进行管理,实验动物屏障设施启用后,一直比较稳定。通过对实验动物屏障设施空调净化系统两年多的运行管理,深深体会到良好设施科学规范管理是非常必要的。     

Effect of Pseudomonas fluorescens on beef discoloration and oxymyoglobin oxidation in vitro

The relationship between bacterial growth and oxymyoglobin oxidation in vitro and in meat was studied. In the in vitro study, oxymyoglobin was combined with Pseudomonas fluorescens or sterile nutrient broth (control) in an airtight vessel. P. fluorescens samples showed greater metmyoglobin formation and oxygen consumption than controls. The P. fluorescens population in the reaction vessels was correlated with metmyoglobin formation (r = 0.85, P < 0.05) and oxygen consumption (r = 0.91, P < 0.05). When P. fluorescens and oxymyoglobin were combined in an airtight vessel, reducing the headspace from 13 ml and 9 ml to 3 ml resulted in greater metmyoglobin formation (P < 0.05). In the meat study, beef cores prepared from longissimus lumborum were inoculated with P. fluorescens (10(7) CFU/cm2) or sterile peptone water (control), packaged under 1% O2 (+99% N2), air, or 100% O2 and stored at 4 degrees C. Inoculated beef cores showed higher bacterial loads and metmyoglobin formation than their respective controls during 10 h storage in 1% O2, 3 days in air, and 7 days in 100% O2 (P < 0.05). This finding indicated that P. fluorescens could accelerate beef discoloration. Overall, studies demonstrated that oxygen consumption concomitant with P. fluorescens growth decreased partial oxygen pressure, which accelerated oxymyoglobin oxidation.     

Effects of traumatic brain injury on working memory-related brain activation in adolescents.

Eight adolescents (ages 13-18 years) who sustained traumatic brain injury (TBI) and eight gender- and age-matched typically developing (TD) adolescents underwent event-related functional MRI (fMRI) while performing a Sternberg letter recognition task. Encoding, maintenance, and retrieval were examined with memory loads of one or four items during imaging. Both groups performed above a 70% accuracy criterion and did not differ in performance. TD adolescents showed greater increase in frontal and parietal activation during high-load relative to low-load maintenance than the TBI group. The TBI patients showed greater increase in activation during high-load relative to low-load encoding and retrieval than the TD group. Results from this preliminary study suggest that the capability to differentially allocate neural resources according to memory load is disrupted by TBI for the maintenance subcomponent of working memory. The overrecruitment of frontal and extrafrontal regions during encoding and retrieval following TBI may represent a compensatory process. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

12MnNiVR钢板拉伸试样分层开裂原因分析

利用金相显微镜、扫描电镜、能谱分析等手段,研究12Mn Ni VR钢轧后拉伸试样中的夹杂物和显微组织,分析拉伸试样产生分层现象的原因。结果表明,在连铸坯凝固过程中12Mn Ni VR钢钢坯中心出现以合金元素C、Mn为主的偏析,使轧后钢板中存在大量的长条状Mn S夹杂物和条带状回火索式体组织。组织的不均匀致使试样在拉伸过程中产生局部应力集中,进而出现开裂分层现象,导致力学性能下降。     

对象的交互测试与OATS正交阵列测试系统

对象交互测试是面向对象软件测试的一个重要环节。交互测试的重点是确保对象的消息能够正确传送。文章在完全测试不可能的情况下,提供了一种特殊的抽样方法———正交阵列测试方法OATS,从统计学角度指导“实验”以测试组件所有可能配置的子集,从而实现最少测试获得最高覆盖率。     

基于WEB视频的授课系统生成器

该文介绍了一个授课系统生成器的设计与实现方法,该系统集Web技术、视频点播技术、信息发布技术和网络数据库等技术于一体。根据通常教学授课和网络教学的特点,设计了一个灵活的网络教学开发平台,使用户能方便地定制出符合实际情况的网络教学系统。