中碳钢缺口疲劳裂纹的萌生及扩展规律的研究

经研究中碳合金结构钢３５ＣｒＭｏ，４２ＣｒＭｏ在不同应力比下（Ｒ＝０．１和Ｒ＝０．３）三点弯曲缺口试件的疲劳裂纹萌生及长，短裂纹的扩展规律，确定了该钢的缺口根部最大应力范围△σｍａｘ和疲劳裂纹萌生周次Ｎｉ的关系及疲劳裂纹萌生门截坎值（△σｍａｘ）ｔｈ，并得出了这两种钢在长，短期纹阶段的扩展规律。     

如何做好《模拟电子技术》实验

本文根据笔者几年的实验教学实践,就如何提高学生的动手能力(包括查找和解决电路故障的能力)提出了自己的见解,并对实验教学的改进提出了自己的建议.     

Effect of hydrogen peroxide on the binding of Merocyanine 540 to human erythrocytes

The fluorescent dye Merocyanine 540 (MC540) is often used as a probe to monitor the molecular packing of phospholipids in the outer leaflet of biomembranes. In a previous study we showed that the increased staining of erythrocytes with a perturbed membrane structure was mainly due to an increase in the fluorescence yield of cell-bound MC540, rather than to an increase of the number of bound molecules. Erythrocytes and ghosts exposed to continuous fluxes of H₂O₂ exhibited pronounced lipid peroxidation. Further, red blood cells subjected to this form of oxidative stress also showed increased staining with MC540. It appeared that this was caused by a strong increase in binding of MC540, together with a slight red shift of the fluorescence emission maximum and a small increase in the fluorescence yield of bound MC540. The changed MC540 binding characteristics were not observed when lipid peroxidation was suppressed by the presence of the antioxidant BHT in the incubation medium. However, open ghosts exposed to H₂O₂ showed no increase of MC540 binding, excluding a direct involvement of lipid peroxidation. Measurement of fluorescence emission spectra and gel filtration studies showed that MC540 can bind to H₂O₂-exposed hemoglobin. Experiments with erythrocytes lysed in hypotonic medium after exposure to H₂O₂ revealed that peroxidation of lipids with H₂O₂ induced a non-specific permeabilization of the plasma membrane to MC540, thereby allowing MC540 to bind to the oxidatively denatured, more hydrophobic hemoglobin. These results indicate that conclusions about packing of phospholipids in the outer leaflet of the membrane based on increased MC540-staining should be drawn with care. Received 27 September 1996; received after revision 5 November 1996; accepted 27 November 1996     

丁烯二酸二异辛酯生产工艺的改进

通过系列的实验，研究了催化剂，反应温度和操作压力对酯化过程的影响，找出了适宜的反应条件，改进了丁烯二酯二异辛酯酯化过程的生产工艺，并扩大生产。     

平台用钢微观组织对其分层面上解理断裂应力的影响

利用专门设计的厚度方向缺口四点弯曲试样，结合相应的弹塑性有限元计算结果，在液氮温度下测取了一种海洋平台用钢的６种微观组织分层面上的解理断裂应力σ＊ｆ．结果显示，均匀细小的铁素体＋贝氏体组织具有比铁素体＋带状珠光体为高的σ＊ｆ值．对于同一终轧温度，轧后冷速愈高，其得到的微观组织之σ＊ｆ值愈高．而对于同一轧后冷却制度，则终轧于Ａｒ３与再结晶停止温度之间者其得到的微观组织具有最高的σ＊ｆ值．讨论了各微观组织组成相的作用     

有源消声耳罩的设计研究

本文对有源消噪电路的设计进行了分析研究,并采用单通道有源消嗓电路,实现了320Hz—510Hz.频率范围内3dB以上的消声效果.根据理论上分析和实际模拟消声电路设计和实验,对有源消声提出了改进建议.     

三参数Weibull分布下随机截尾恒加寿命试验的Bayes统计分析

利用随机截尾恒加寿命试验所获的数据，导出了三参数Ｗｅｉｂｕｌ分布在平方损失下，三个参数的Ｂａｙｅｓ估计，进一步估计了在正常应力水平下的各种可靠性指标     

巨型模锻水压机立柱应力在线检测及保护系统

通过对100MN多向模锻水压机的立柱在偏载工况下的受力状态的简要分析,并根据立柱应力特征与水压机的结构特点,提出了一种新型的非接触式立柱应力在线检测方法。以电涡流传感器为基本单元,并采用动态“O”点技术,建立了100MN多向模锻水压机的应力检测与保护系统及其软件。实验研究及应用表明,所研制的系统具有良好的稳定性和抗干扰能力,同时很好地抑制了零漂对检测精度的影响,该检测方法可应用于大型机械(轧机、挤压机等)封闭框架应力的间接检测。     

家禽热应激及预防措施(综述)

综述了高温的不良刺激使家禽产生热应激后，家禽体内所引起的体热平衡、内分泌、血液化学成分等非特异性应答反应，以及对热应激的有效预防措施     

求解层合板内残余应力的边界单元法

本文导出基于边界元理论的一种数值方法，用以计算正交层合板的温度应力，对于板的平面问题的应力分析，采用格林基本解答做为权函数，导出板的边界积分方程。对于有侧向载荷的板壳，同时采用两种不同的基本解为权函数，建立一组边界积分方程。数值计算结果收敛，和实验结果基本相符，证实了方法的可行性。