Synthesis, oxygenation and catalytic performance of manganese complex with p-aminomethyl benzoic acid Schiffbase

The amino acid Schiff base complex (Sal-AMBA-Mn) was prepared with p-amino-methylbenzoic acid, salicylaldehyde and Mn(OAc)2·4H2O. Its structures was characterized with IR and UV spectra. Oxygenation mechanism of the complex in N, N-dimethylformamide solution was investigated. The results show that lower temperature is in favor of the oxygenation, and energy, enthalpy and entropy are -3.8 kJ/mol, -4.2 J/mol and -161.44 J/(mol·K), respectively. In the presence of the manganese complex, dehydroepiandrosterone acetate is effectively oxidized by molecular oxygen and the corresponding enone 7-ketodehydroepiandrosterone acetate is obtained. The yield is 62.1% when the oxidation is carried out under the reaction conditions of 60 ℃, 2 MPa of O2 pressure, C5H5N as a solvent and molar ratio of the substrate to the complex of 1:10.     

坐姿下人体振动特性建模及实验分析

为客观评价垂直振动条件下人体生物力学响应,依据多体动力学原理建立了七自由度无靠背坐姿下人体振动模型。根据不同频率下人体振动实验数据,采用最小二乘参数识别法以及加权计算得到人体动力学参数,根据识别出的参数进行人体振动特性分析,得到了特定频率下人体头部振动加速度响应特性。应用近红外光谱法无创检测脑部组织血氧参量,分析了不同频率下血氧参数变化。实验结果表明:该模型有较高的预测精度,可为动态环境下人机界面设计提供重要参考,对于客观评价人体坐姿舒适性,提高汽车人机界面设计宜人性有指导意义。     

汽车驾驶员脑氧参数的振动响应特性分析

应用近红外光谱法,研究分析汽车驾驶员在振动状态下的脑部血氧参数变化,探讨车辆振动对脑氧参数的影响。实验过程中应用近红外光谱法监测试验人员脑氧参数。经方差分析发现实验人员经车辆振动后脑部各血氧参数有显著性变化。实验结果表明汽车振动对脑部血氧参数还原血红蛋白的浓度(c_Hb)、氧合血红蛋白的浓度(c_HbO2)、血红蛋白总量的浓度(c_tHb)有显著性影响,且不同频率振动的影响显著性不同,其中4.5Hz的振动对脑氧参数影响最大;但振动对脑部组织血氧饱和度(tissue oxygen index,TOI)的影响极小。     

Sm的氧化对Sm2(Co,Fe,Cu,Zr)17磁体微观结构及磁性能的影响

用粉末冶金法制备了Sm2(Co,Fe,Cu,Zr)17磁体,研究了工艺过程Sm的氧化对材料性能影响。微观分析表明,Sm的氧化主要以Sm2O3形成析出孔洞,破坏了材料的组织结构,从而影响材料的性能。     

电工冷轧冲片退火热处理工艺探讨

电工冷轧冲片的导磁性能受冲剪后边缘效应的影响而恶化，通过电工冷轧冲片的退火热处理工艺，恢复或提高其导磁性能，为提高电机性能和降低材料成本进行有益探索。     

印染废水光催化降解研究

采用石英管式光催化反应器，用紫外灯激发染料污水悬浮液中TiO2产生OH自由基，将染料催化氧化脱色。探讨了催化剂用量、污水浓度、光照时间、pH值对光解率的影响。实验结果表明，在40W紫外灯的照射下，催化剂的用量为0．6g／L．污水浓度40mg／L，灯照时间210—270min(依染料结构不同而定)，污水脱色效率一般在(0．92．0．95)之间。COD去除率88％。     

Closed-loop control of extracorporeal oxygen and carbon dioxide gas transfer

Additional extracorporeal gas transfer facilitates ultra-protective mechanical ventilation during treatment of severe lung disease. The proposed automation contributes to both patient safety and therapeutic success. A decentralized control system set the oxygen and carbon dioxide gas transfer rates. The controlled variables are estimated using standard measurement devices without direct blood contact. To reduce patient stress, an outer-loop integral controller adjusts the extracorporeal blood flow. The control system was first evaluated in silico and then in vivo using an animal model. Finally, the method is shown to be feasible and its response time is sufficient to meet patients' clinical needs.     

Dynamic pushing on three frictional surfaces: maximum acceptable forces,cardiopulmonary and calf muscle metabolic responses in healthy men

Pushing is an important materials handling activity in many occupations; however, pushing-related physiological investigations are still in infancy. The purpose was to evaluate maximum acceptable forces and physiological responses while pushing on: treadmill (TREAD); plywood floor (PLY); and Teflon floor (TEF). Acceptable forces, cardiopulmonary and calf muscle oxygenation and blood volume responses were collected simultaneously while 12 men (age 39 ± 13 years; height 178 ± 6 cm; and body mass 91.5 ± 16 kg) pushed for 2 h on each surface at their psychophysical workload. Participants selected higher forces on the PLY, resulting in higher pulmonary oxygen uptake compared to that of TEF (by ～9%) and TREAD (by ～18%). Pushing on the TEF demonstrated 50–56% lower blood volume changes and 1.5–1.8 times more oxygenation-force ratio than that for other surfaces. It is concluded that, to avoid a potential slip, participants were conservative in selecting acceptable forces to push on the slippery TEF. Part of this compensatory strategy on the TEF resulted in less muscle activity and, therefore, less demand for oxygen delivery to the calf muscle than for other surfaces. The present findings of significant force- and physiological-related differences in treadmill vs. high inertia pushcart clearly demonstrate that pushing experiments are essential to evaluate functional abilities of the workers.     

地下水除铁锰装置的工艺设计及其应用

本文介绍了地下水除铁锰装置的工艺设计、原理及流程安装、操作程序，并根据应用实例，证明了含铁锰过量的地下水，采用充氧曝气接触催化氧化法处理后，其水质符合国家ＧＢ５７４９－８５规定的饮用水标准。     

浓度和流量对瓦斯加热氧化净化率的影响

传统的瓦斯爆炸防治方法虽然具有一定的效果,但却存在着很大的局限性,为了从根本上解决瓦斯爆炸的危害,对绝热氧化法进行了实验研究,在实验条件下通过绝热氧化使瓦斯气体中的CH4在爆炸浓度以下（体积浓度1％－5％）,流量在25－90L／min时氧化成无毒,无爆炸危险的CO2和H2O,净化了瓦斯气体,通过系统试验,研究了浓度和流量对瓦斯气体加热氧化净化率的影响,为消除煤矿瓦斯积聚提供了实验基础和进一步研究的新途径。