过氧自由基氧化对花生球蛋白结构及聚集行为的影响

采用不同浓度的2,2′-盐酸脒基丙烷[2,2′-azobis（2-amidinopropane）,AAPH]有氧热分解产生的过氧自由基氧化花生球蛋白,研究AAPH 氧化对花生球蛋白分子结构及聚集行为的影响。结果显示：随着AAPH 浓度的增加,花生球蛋白表示浊度的吸光度由0.20±0.01 增加至0.44±0.01,平均粒径从（153.94±3.31）nm 增加到（196.80±3.06）nm,而游离巯基含量从（14.62±0.08）μmol/g 下降到（7.77±0.25）μmol/g,Zeta 电位绝对值从（24.17±0.06）mV 下降到（15.93±0.05）mV。对荧光最大发射波长的研究表明,在AAPH 浓度为0～1 mmol/L 时,内源荧光最大荧光峰位红移,在AAPH 浓度为5～15 mmol/L 时,内源荧光最大荧光峰位蓝移。过氧自由基氧化导致花生球蛋白α-螺旋结构含量下降,β-折叠和无规则卷曲含量上升,呈现出α-螺旋向β-折叠和无规则卷曲转化的趋势。扫描电镜观察结果显示,花生球蛋白经过氧自由基氧化后,蛋白由聚集紧实逐渐变得发散,浓度从10 mmol/L 升高到15 mmol/L 时,花生球蛋白表面形态变疏松,孔隙显著增大。因此,AAPH 适度氧化可以通过改变花生球蛋白的结构影响其聚集行为,特别是浓度为5～10 mmol/L 时有利于花生球蛋白的聚集。     

一种新型自毁芯片监测和执行电路的设计

针对当前自毁技术中,自毁监测方式单一且自毁执行较长和自毁不彻底、不稳定导致自毁成功率较低的问题,设计了一种同时具备自毁实时监测和执行的电路系统.该电路系统设计了封装拆卸和上电时序两种自毁监测方式,使自毁监测的方式更加多样,提高结果的准确性.同时利用MOS管作为开关特性,来减少自毁执行的时间.实验结果表明,该电路系统在3...     

Optimal carbon reduction level and ordering quantity under financial constraints

Carbon tax policy is widely adopted by many countries to curb carbon emissions. In the context of carbon tax policy, firms have more incentive to improve carbon reduction levels by reducing their carbon tax costs. However, firms need to bear carbon reduction costs that may cause shortage of capital. Thus, firms may face problems of financial constraints, which may demotivate firms to produce greener products. To address the decision‐making challenges of firms in the contexts of carbon tax policy and financial constraints, we consider a supply chain with a manufacturer who produces green products and a retailer who sells these products. Our study develops five models to investigate the two firms’ optimal wholesale price, carbon reduction level and ordering quantity, according to the manufacturer and retailer with or without financial constraints. Our goal in this study is to explore how carbon tax policy and banks’ interest rates affect the profits of the two firms, supply chain and consumer surplus. Certain managerial insights are obtained as follows. We demonstrate that carbon tax policy and banks’ interest rates demotivate the manufacturer to produce greener products and demotivate the retailer to order more products. If the interest rate to the manufacturer (retailer) is relatively low, then the manufacturer with financial constraint benefits (harms) the consumers compared with the retailer with financial constraint. Importantly, our analysis suggests that carbon tax policy harms the firms but benefits consumers, and the government in some conditions should reduce unit carbon tax.     

4500V SPT IGBT 动静态损耗优化

本文关注高压IGBT动静态性能的优化。对4500V增强型平面IGBT进行研究,该结构在阴极一侧具有载流子存储层。其中垂直结构采用软穿通(SPT)结构,顶部结构采用增强型平面结构,该结构被称为SPT IGBT,仿真结果显示4500V SPT 具有软关断波形,与SPT结构相比提升了导通压降和关断损耗之间的折衷关系。同时,对不同载流子存储层掺杂浓度对动静态性能的影响也进行了研究,以此来优化SPT IGBT的动静态损耗。     

同向抽运光纤拉曼放大器功率转换效率的理论分析

为了对同向抽运光纤拉曼放大器的功率转换效率进行研究,由耦合方程出发,首先理论推导出功率转换效率的解析解,然后采用数值计算的方法详细分析不同物理因素对功率转换效率的影响。结果表明：功率转换效率先随着光纤长度和单位面积的拉曼增益系数增加而增加,当增加到最大值时保持数值不变;小信号时,初始信号光功率对功率转换效率的影响较小;大信号时,功率转换效率随着初始信号光功率增加而快速增加;功率转换效率和初始抽运光功率呈抛物线曲线关系;抽运光与信号光的频率比增加时,功率转换效率减小。     

大刚度裙房多塔结构实用简化设计方法探讨

多塔结构整体设计分析难度大、可操作性差,难于考察各塔楼的静、动力特性。对于裙房刚度远大于塔楼刚度的多塔结构,可将整体模型简化为裙房模型和单塔模型进行设计,并将单塔模型的地震力进行一定比例放大。通过设置翼墙、加厚楼板与加强楼板配筋等措施来减小塔楼间楼板内的拉压应力。     

大庆东部气层损害因素及磁化技术的应用

通过钻井液对气层损害因素进行了试验研究，对大庆东部气层损害因素有一定的认识。同时探讨了磁化技术用于保护油气储层的可能性。     

回采工作面上隅角瓦斯积聚的治理

介绍回采工作面上隅角瓦斯积聚的处理方法.