冷热饮水机分流阀注射模设计

根据分流阀的结构特点,介绍了分流阀注射模的主要结构,该结构解决了外螺纹侧向抽芯与塑件上小孔的4个方向抽芯问题,并就模具浇注系统的偏心问题的解决方法进行了说明     

Volatile compounds in oils after deep frying or stir frying and subsequent storage

Soybean oil (900 g) was heated by deep frying at 200°C for 1 h with the addition of 0, 50, 100, 150 and 200 mL water, and then stored at 55°C for 26 weeks. Soybean oil, corn oil and lard were heated by stir frying and then stored at 55°C for 30 weeks. The volatiles and peroxide values of these samples were monitored. All samples contained aldehydes as major volatiles. During heating and storage, total volatiles increased 260-1100-fold. However, aldehyde content decreased from 62–87% to 47–67%, while volatile acid content increased from 1–6% to 12–33%; especially hexanoic acid which increased to 26–350 ppm in the oils after the storage period was completed. Water addition to the oils heated by deep frying tended to retard the formation of volatile compounds. The total amount of volatile constituents of lard heated by stir frying increased more during storage than that of corn oil or soybean oil. Peroxide values did not reflect the changes of volatile content in the samples.     

含氰污水处理工程设计体会

龙泉金矿在全泥氰化提金过程中产生含氰化物１７４．７６ｍｇ／Ｌ的洗涤废水，通过碱式氯化法处理后，再由渣浆泵送入尾矿库进行自然净化作用，污水得到进一步净化，尾矿库溢流废水氰化物浓度低于０．５ｍｇ／Ｌ，废水排入小梅溪后，下游第一个居民取水点氰化物浓度低于０．００４ｍｇ／Ｌ，达到了国家规定的标准。     

Light-sensitive elastomers modified by 4-(N-dimethylmaleimido)-benzenesulphenyl chloride

New light-sensitive polymers were prepared by modification of four different elastomers with 4-(N-dimethylmaleimido)-benzenesulphenyl chloride (DMI-BSCI). Polydienes modified by DMI-BSCI form block copolymers. These polymers show a strong increase of the glass transition temperature T_g whereby the T_g increase of modified poly(octenamer) is much smaller. Higher modified polydienes have two T_g. Modified poly(octenamers) show a melting temperature dependence T_m on the content of trans double bonds which is characteristic of statistical copolymers. The ratio of rate constants with which trans- and cis-structures in poly(octenamer) are occupied by DMI-BSCI, is

$\text{k}{}_{\mathrm{trans}}\text{k}{}_{\mathrm{cis}}\text{= 0.34}$

     

PROBING HIDDEN POLYMERIC INTERFACES USINGIR-VISIBLE SUM-FREQUENCY GENERATION SPECTROSCOPY

Understanding the molecular-level processes underlying interfacial phenomena is important in the area of adhesion. We briefly introduce IR-visible sum-frequency generation spectroscopy (SFG) using a total-internal-reflection geometry for the study of polymer-air, polymer-solid, and polymer-polymer interfaces. The following examples, predominantly of work done in our lab, illustrating differences in molecular structure and dynamic properties at interfaces are presented: the air- and solid-interface structure of an amorphous polystyrene (PS) and a semicrystalline polymer with side-chain crystallinity, poly(octadecyl acrylate) (PA-18); structure of a polymer-polymer interface between thin films of a semicrystalline polymer with side-chain crystallinity, poly(vinyl-N-octadecylcarbamate- co-vinyl acetate), and an amorphous PS; thermal order-to-disorder transitions of the air and solid interface of PA-18, and the interface of this polymer with PS; and dynamic surface-relaxation studies of a rubbed PS film.     

一种多元复合地基复合模量的计算方法

多元复合地基的沉降计算依赖于其复合模量的取值.目前多元复合地基复合模量计算均未考虑桩对桩间土的侧向挤密作用,因而其沉降计算结果与实际值相差较大.而考虑桩体与桩间土的侧向挤压作用,依据线弹性变形理论,推求的多元复合地基的复合模量公式应用于工程实例,结果表明,该方法是合理可行的,并且存在着参数易于确定、方法简便、机理清楚的特点.     

涤棉织物单面防水泡沫涂层工艺

通过泡沫整理法对涤棉织物进行单面防水整理,使其单面防水的同时反面具有良好的吸湿透气性能。复配了稳定型泡沫防水涂层剂,并探讨了该涂层工艺的最佳焙烘温度和时间。实验结果表明,最佳整理剂配方为防水剂与10%SDS溶液以2∶1混合,并添加CMC 10g/L,HEC 0.5g/L,PTF 5g/L,焙烘温度160℃,时间3min,效果最佳;织物带液率由传统整理的45%降至为26%,节约原料55%。     

分布视频编码中基于帧间相关性的自适应关键帧选取算法

针对分布式视频编码(DVC)系统中固定周期关键帧选取(PKFS)方法忽视了帧间相关性的缺陷,提出了一种自适应关键帧选取(AKFS)算法。利用图像特征点检测与匹配的方法,将相邻图像的非匹配点作为帧间相关性的近似,把累积或平均非匹配点数超过阈值的帧判定为关键帧。在此基础上,提出改进的帧内插方案,以适应不同长度序列组的边信息生成;将零运动强度的关联帧合并为一帧图像参与编解码,进一步提高了系统的压缩效率。实验结果表明,对于不同运动特性的序列,本文提出的算法可以明显提升边信息帧的重建质量,使系统的率失真性能提高0.9～2.0 dB,并有效降低了编码传输码率。     

信息熵角度下的深度学习旁路安全评估框架

基于深度学习的建模类旁路密码分析（Deep Learning Side Channel Analysis/Attack,DLSCA）对于各种旁路攻击场景的密码破解效果都十分显著,但是DLSCA仍存有安全评估问题。基于AES对称加密算法的能量分析,通过信息熵角度分析准确率等传统机器学习性能指标无法评估DLSCA深度神经网络（Deep Neural Network,DNN）模型训练程度的原因。定义密钥信息量,分别阐释密钥信息量与旁路安全评估、DNN模型训练阶段性能评估的关系,建立深度学习模型与旁路分析二者的联系,提出以密钥信息量为核心的DLSCA安全评估框架。     

印尼地区嵌岩灌注桩竖向承载特性现场试验

为更加深入研究不同竖向荷载作用下大直径嵌岩灌注桩的承载特性与荷载传递规律,以印尼地区某工程为依托,对3根直径为800 mm的嵌岩灌注桩进行单桩竖向抗压静载试验与桩身应力测试。试验结果表明:3根试桩的Q-s曲线均为缓变型,沉降量均不超过17 mm,回弹率较大,介于54.8%~70.9%之间,残余沉降较小,承载力较高,均满足设计要求。桩身轴力随桩顶荷载的增加逐渐增大,随深度逐渐递减;桩侧摩阻力的发挥具有异步性,随着荷载的增大,桩侧摩阻力逐渐发挥,在嵌岩段桩侧摩阻力最大,但仍未充分发挥;桩端阻力随桩顶荷载的增加近似呈线性增大,在最大荷载作用下,桩端阻力占比约55%,表现出摩擦端承桩的特性。研究结果对国内桩基规范的完善以及当地桩基规范的制订具有较重要的意义。