金属带材拉伸弯曲矫直过程简化解析分析(1)——带材延伸率计算方法的探讨

对平面假设下带材拉伸弯曲时延伸率的计算进行了详细的讨论,提出了简洁的延伸率计算公式,并在延伸率计算公式中考虑了带材的原始曲率.     

集输管线腐蚀原因分析

研究了青海油田集输管线腐蚀的主要原因。结果表明:水样中高氯离子含量、高总含盐量、高矿化度是影响管线腐蚀加剧的重要原因。细菌微生物参与了管线的腐蚀反应,它与溶液中氯离子共同作用,使管线局部腐蚀加剧。同时管线还受到由硫化氢引起的应力腐蚀作用,使得管线既可能由于坑蚀或孔蚀导致腐蚀穿孔,还可能由于应力腐蚀而导致突发性开裂。     

A 4H-SiC semi-super-junction shielded trench MOSFET: p-pillar is grounded to optimize the electric field characteristics

A 4H-SiC trench gate metal–oxide–semiconductor field-effect transistor (UMOSFET) with semi-super-junction shielded structure (SS-UMOS) is proposed and compared with conventional trench MOSFET (CT-UMOS) in this work. The advantage of the proposed structure is given by comprehensive study of the mechanism of the local semi-super-junction structure at the bottom of the trench MOSFET. In particular, the influence of the bias condition of the p-pillar at the bottom of the trench on the static and dynamic performances of the device is compared and revealed. The on-resistance of SS-UMOS with grounded (G) and ungrounded (NG) p-pillar is reduced by 52% (G) and 71% (NG) compared to CT-UMOS, respectively. Additionally, gate oxide in the GSS-UMOS is fully protected by the p-shield layer as well as semi-super-junction structure under the trench and p-base regions. Thus, a reduced electric-field of 2 MV/cm can be achieved at the corner of the p-shield layer. However, the quasi-intrinsic protective layer cannot be formed in NGSS-UMOS due to the charge storage effect in the floating p-pillar, resulting in a large electric field of 2.7 MV/cm at the gate oxide layer. Moreover, the total switching loss of GSS-UMOS is 1.95 mJ/cm² and is reduced by 18% compared with CT-UMOS. On the contrary, the NGSS-UMOS has the slowest overall switching speed due to the weakened shielding effect of the p-pillar and the largest gate-to-drain capacitance among the three. The proposed GSS-UMOS plays an important role in high-voltage and high-frequency applications, and will provide a valuable idea for device design and circuit applications.     

浅谈公共关系与组织形象

从"公共关系"和"组织形象"两个基本涵义出发分析二者之间的关系,认为现代社会组织发展必须塑造良好的形象,它是现代组织不可或缺的竞争、制胜法宝;要塑造良好的组织形象,就必须运用公共关系这一手段,二者存在密不可分的相互联系和内在的一致性.     

轻钢轻板住宅技术体系的多元化特征

基于对轻钢轻板住宅适用技术的辩证分析,提出了发展轻钢轻板住宅技术体系应坚持二点论,即高新技术（先导）和多层次化技术（基础）结合的技术模式,并进一步就发展趋势进行了论述。     

热带钢轧机平坦度控制补偿策略

在带钢热连轧平坦度控制系统中,平坦度实测信号通常包含精轧后带钢横向温差引起的附加干扰.针对鞍钢ASP1700热连轧机组,利用红外热像仪测量精轧后带钢横向温度场.通过具体分析温差附加干扰对带钢平坦度控制的影响,采用最小二乘法拟合得到带钢横向温度场分布规律,建立了平坦度控制目标设定的温差补偿模型.     

基于法律要素引导的相似案例推荐算法

大量的法律案例以数字化的形式存储,使得法务工作者及普通民众可以轻松地从法律案例库中搜索需要的信息,其中有用但又很有挑战的一项任务就是相似案例推荐.为了准确地从法理角度推荐相似案例,本文提出了一个基于神经网络的相似案例推荐模型,该模型首先用法律要素引导每个案例的文本表示向量的生成,进而用生成的向量计算任意一对案例的相似度...     

广西发酵酸笋气味物质提取方法优化及比较分析

为了探究不同加工工艺对酸笋品质的影响,将麻竹笋采用切片和整根发酵两种方式处理,并分别添加盐、乳酸菌复合培养液两种不同加工辅料发酵制作酸笋,以传统添加水发酵为对照组,比较不同工艺加工酸笋的总酸、氨基态氮、亚硝酸盐、主体风味、感官评价、挥发性风味物质以及微观结构的变化。结果表明,切片酸笋氨基态氮平均含量较整根酸笋高38.2%,酸度低于整根发酵酸笋,组织结构更为疏松,挥发性物质种类比整根发酵酸笋多12种,亚硝酸盐含量差异不显著;添加盐和接种发酵酸笋中,盐发酵酸笋较接种发酵酸笋氨基态氮含量高10.6%,挥发性物质种类盐发酵比接种发酵酸笋多4种,接种发酵酸笋酸度高于盐发酵酸笋,亚硝酸盐含量显著低于盐发酵（P<0.05）,所有发酵成品酸笋亚硝酸盐含量均低于3.5 mg/kg。感官评价结果显示,盐发酵的切片酸笋其色泽、口感最好,评分高达91分,综合分析得出切片盐发酵得到的酸笋酸度适宜,品质最佳。本研究为酸笋的生产工艺及工业化应用提供了理论依据和技术支撑。

     

无线体域网物理层传输编码理论综述：低密度奇偶校验码优化设计

面向无线体域网(WBAN)传输环境,该文主要论述信道编码与联合信源信道编码系统的码字设计。针对物理层的低功耗和高可靠传输需求,从低密度奇偶校验(LDPC)码的优化设计角度展开,主要在信道模型分类、传输系统构建、技术挑战与解决方案、信道适配性编码设计这4个层面进行梳理和总结。最后,对WBAN环境下LDPC码优化设计的未来研究工作进行展望,为构建下一代通信技术提供参考。     

Path Planning and Tracking Control for Parking via Soft Actor-Critic Under Non-Ideal Scenarios

Parking in a small parking lot within limited space poses a difficult task. It often leads to deviations between the final parking posture and the target posture. These deviations can lead to partial occupancy of adjacent parking lots, which poses a safety threat to vehicles parked in these parking lots. However, previous studies have not addressed this issue. In this paper, we aim to evaluate the impact of parking deviation of existing vehicles next to the target parking lot(PDEVNTPL) on the au...