摆式电容倾角传感器动态特性分析

在分析摆式电容倾角传感器原理及传感器力学模型的基础上,导出传感器动态特性方程和传递函数.理论分析表明,通过适当选取摆的敏感材料及阻尼介质可明显改善其动态性能,采用软件补偿算法同样可提高传感器的动态性能,减少动态误差,从而提高传感器的测量效果.Matlab仿真及实验结果证实了优化方案的可行性,从而满足实际测量对传感器的动态性能要求.     

Catalytic reduction of no over perovskite-type catalysts

In the present work, we have investigated the reduction of NO by propane over perovskite-type oxides prepared by malic acid method. The catalysts were modified to enhance the activity by substitution of metal into A or B site of perovskite oxides. In addition, the reaction conditions, such as temperature, O₂ concentration, and space velocity have been varied to understand their effects on the catalytic performance. In the LaCoO₃ type catalyst, the partial substitution of Ba and Sr into A site enhanced the catalytic activity in the reduction of NO. For the La_0.6Ba (Sr)_o.4 Co_1−x Fe_xO₃ (x=0-1.0) catalyst, the partial substitution of Fe into B site enhanced the conversion of NO, but excess amount of Fe decreased the conversion of NO. The surface area and catalytic activity of perovskite catalysts prepared by malic acid method showed higher values than those of solid reaction method. The conversion of NO increased with increasing O₂ concentration and contact time. The introduction of water into reactant feed decreased the catalytic activity but the deactivation was shown to be reversible over La_0.6Ba_0.4Co_1−x ,Fe_xO₃ catalyst.     

A Possible Industrial Solution to Ferment Lignocellulosic Hydrolyzate to Ethanol: Continuous Cultivation with Flocculating Yeast

The cultivation of toxic lignocellulosic hydrolyzates has become a challenging research topic in recent decades. Although several cultivation methods have been proposed, numerous questions have arisen regarding their industrial applications. The current work deals with a solution to this problem which has a good potential application on an industrial scale. A toxic dilute-acid hydrolyzate was continuously cultivated using a high-cell-density flocculating yeast in a single and serial bioreactor which was equipped with a settler to recycle the cells back to the bioreactors. No prior detoxification was necessary to cultivate the hydrolyzates, as the flocks were able to detoxify it in situ. The experiments were successfully carried out at dilution rates up to 0.52 h⁻¹. The cell concentration inside the bioreactors was between 23 and 35 g-DW/L, while the concentration in the effluent of the settlers was 0.32 ± 0.05 g-DW/L. An ethanol yield of 0.42–0.46 g/g-consumed sugar was achieved, and the residual sugar concentration was less than 6% of the initial fermentable sugar (glucose, galactose and mannose) of 35.2 g/L.     

压痕法确定纤维复合材料界面影响区蠕变特性的数值模拟法

研究由平头压痕蠕变试验来确定纤维复合材料界面影响区蠕变性能参数的可行性。利用有限元蠕变分析确定在定压痕应力下的压痕蠕变率，重点放在稳定压痕蠕变率和复合材料材料界面影响区的蠕变性能参数的关系上。计算结果表明，界面影响区的剪应力沿纤维轴向在蠕变的主要过程中均匀分布，并且保持不变；详细地研究了压头大小对压痕蠕变响应的影响：提出两种方法由压痕蠕变试验来确定界面影响区蠕变性能参数，并给出了算例。这些结果也有利于准确认识平头压痕蠕变试验从而拓宽其应用范围。     

MFE环氧乙烯基酯树脂固化性能的研究

本文对MFE环氧乙烯基酯(含MFE型和AFE型二种型号)树脂的固化性能(凝胶时间、放热峰和固化收缩率)作了报道并进行讨论。     

甲醇/正己烷的渗透汽化分离的研究 Ⅰ.渗透汽化膜的研制

本文研制了从甲醇／正己烷体系中分离甲醇的渗透汽化复合膜ＣＡ／ＰＡＮ（ＰＥＳ）、ＰＶＡ／ＰＡＮ（ＰＥＳ）。实验证明膜对该体系有较高的选择分离性和良好的渗透性，当进料甲醇浓度为３％时，渗透通量Ｊ≈０．６００ｋｇ／ｈ·ｍ２，分离因子α→∝。本文还考察了不同操作条件对膜分离性能的影响及膜的稳定性和均匀性。     

光学纯去氢枞酸的制备与表征

用化学方法由歧化松香制得光学纯去氢枞酸，并以ＵＶ、ＩＲ、＾１ＨＮＭＲ、ＭＳ、元素分析和旋光对其结构进行了表征。     

炼厂外排污水回用于循环冷却水腐蚀影响因素初探

从单因素、多因素和复杂水系考察了炼厂外排污水回用于循环冷却水腐蚀的影响因素，结果表明，碳钢腐蚀的主要影响因素取决于离子特性、氧化膜的形成和溶解氧的扩散等综合协同作用，其中以离子特性的,影响为最大（如：Cl^-、Ca^2 、CO3^2-的腐蚀性较强）。碳钢腐蚀反应又可由以上三种主要影响因素分为三个反应控制区，而当电导率在0．1－2．0mS/cm范围时，其水质属于腐蚀危险高发区。从而也进一步说明水质的低电导率处理，其防腐效果并不理想，相反在高电导率情况下却表现出相对较好的低腐蚀性能。     

长江经济带水-能源-粮食系统耦合时空动态特征研究

水、能源和粮食为可持续发展的基础性资源,如何从时空角度全面评价长江经济带水-能源-粮食系统的耦合协调发展是促进区域资源可持续发展的重要前提。以水、能源、粮食以及共生单元水能、水粮和能粮系统为单元,构建水-能源-粮食系统耦合协调评价指标体系,采用熵值法对各系统指标赋权,运用耦合协调度模型和空间自相关分析对2010—2019年长江经济带的水-能源-粮食系统协调发展和时空动态特征进行定量研究。结果表明：2010—2019年长江经济带水-能源-粮食系统综合评价指数整体呈缓慢增长趋势,其中水系统对水-能源-粮食系统综合评价指数贡献最大,年均贡献占比为21.57%;能源系统贡献最小,占比为11.95%; 2010—2019年长江经济带水-能源-粮食系统耦合协调水平呈先升后降趋势,其中四川省上升幅度为5.05%,重庆市下降幅度为2.83%,且存在显著的空间异质性,上游地区明显高于中下游地区。其中能源资源是水-能源-粮食系统耦合协调发展的短板;长江经济带水-能源-粮食系统耦合协调度表现出显著空间关联性,高-高集聚区集中在长江上游地区,下游地区主要以低-低集聚区为主。长江经济带内各省市应因地制宜地完善资源管理机制,推动长江经济带资源可持续发展。