圆柱齿轮切齿参数的实验分析

圆柱齿轮的齿面质量,基本上取决于整个切齿过程中的切削参数,通过实验分析方法建立影响齿轮表面质量因素的数学模型,以优化切削用量参数,并确定切削用量对齿面质量的影响程度,实验结果表明能满足齿轮表面质量的要求。     

连续式加热炉燃烧系统残氧量控制系统研究

研究连续式加热炉燃烧系统残氧量控制系统,解决连续式加热炉燃烧耗能高、控制性差的难题。系统残氧量测量部分利用热电偶电路收集温度信息,采用氧化锆传感器获取氧浓度模拟量信号,两者经放大及低通滤波处理后,传输至单片机完成运算和人机交互的任务,并利用主控制器ARM操控炉温,间接调控氧化锆传感器的运行,实现残氧测量;系统残氧量控制部分将加热炉温度误差值和温差变化率作为模糊神经网络控制器输入,将燃气量作为模糊控制器输出,反馈到PID控制器利用燃气阀调节燃气量,实现连续式加热炉燃烧系统残氧量控制。实验结果显示:应用该系统的连续式加热炉,能耗节约率平均为3.16%,平均残氧量下降超过1.7%,生产材料氧化烧损平均降低率达到0.11%,证实该系统的残氧量控制效果好,生产成本低。     

High hydrogen storage ability of a decorated g-C3N4 monolayer decorated with both Mg and Li: A density functional theory (DFT) study

In this work, the hydrogen storage properties of a g-C₃N₄ monolayer decorated with both Mg and Li were thoroughly investigated by performing density functional theory (DFT) calculations. Along these lines, the projected densities of states (PDOS) and the Bader Charge analysis showed that both Mg and Li atoms can transfer their electronic charges to the g-C₃N₄ monolayer. Interestingly, the latter is transformed from a semiconductor material to a metallic conductor configuration, while a local electric field is formed around it. On top of that, the formed local electric field polarized hydrogen molecules and as a result, led to an enhanced hydrogen adsorption ability. Mg atoms have more outmost electrons, and more charges can be transferred to the monolayer, which leads to the creation of a stronger local electric field to adsorb an elevated number of hydrogen molecules than Li atoms. On the other hand, Li atoms are lighter, more active and easier to lose outmost electrons than Mg atoms. By considering these advantages, a g-C₃N₄ monolayer decorated with one unit of both Mg and Li was investigated, which has the ability to adsorb 10 hydrogen molecules, leading thus to a high hydrogen storage capacity of 10.01 wt %. Our work paves the way for the development of novel material configurations for improved hydrogen storage applications.     

Cyclic coding algorithms under MorphoSys reconfigurable computing system

This paper introduces reconfigurable computing (RC) and specifically chooses one of the prototypes in this field, MorphoSys (M1) [1], [2], [3], [4], [5]. The paper addresses the results obtained when using RC in mapping algorithms pertaining to digital coding in relation to previous research [6], [7], [8], [9], [10]. The chosen algorithms relate to cyclic coding techniques, namely the CCITT CRC-16 and the CRC-16. A performance analysis study of the M1 RC system is also presented to evaluate the efficiency of the algorithm execution on the M1 system. For comparison purposes, three other systems were used to map the same algorithms showing the advantages and disadvantages of each compared with the M1 system. The algorithms were run on the 8×8 RC (reconfigurable) array of the M1 (MorphoSys) system; numerical examples were simulated to validate our results, using the MorphoSys mULATE program, which simulates MorphoSys operations.     

硬糖制作过程中主要理化指标变化规律研究

硬糖(又称硬性糖果)是经高温熬煮而成,含有很高的干固物和较低的残留水分,质构坚脆[1]。硬糖在温湿度较高的条件下存放一定时间后,由于其本身的吸水性,糖粒表面会逐渐发粘和浑浊,产生轻微烊化现象,使商品价值降低。本文通过测定硬糖在加热和添加不同成分后可溶性固形物含量、透光率、吸光值、pH值、色差值及还原糖含量的变化,分析其烊化机理,为更好的保持和改善硬糖品质,提供理论参考。     

Diastereotopic relationship between planar and central chiralities in the formation of Ru(η3-allyl)(CO)(PPh3)(L–L′) complexes

Hydride ruthenium complexes, RuHCl(CO)(PPh₃)₂(L–L^′) 3 (L–L^′=bidentate ligand having nitrogen and oxygen) react with allenes to give Ru(η³-allyl)(CO)(PPh₃)(L–L^′) complexes 5 in good yields via hydrometalation reaction. The complexes 5 have planar chirality at the η³-allyl ligand and central chirality at the Ru metal, and consist of one pair of enantiomers. Ligand substitution reaction of Ru(η³-allyl)Cl(CO)(PPh₃)₂ complexes 6 with bidentate ligands (L–L^′) also afford the complexes 5 which have the same stereochemistry as those formed by the hydrometalation reaction. The planar chirality is controlled by the central chirality at the Ru metal in both the formations of the complexes 5. The structure of 5a (L–L^′=N–N bidentate ligand) was determined by the X-ray crystal structure analysis.     

基于可见光—红外光图像融合的苹果缺陷检测算法

针对传统苹果缺陷检测方法存在的劳动强度大、生产率低及误判率高的缺点,提出了基于图像融合的苹果缺陷检测算法,该算法利用可见光和红外图像的高、低频小波系数采用不同的融合方法,以获得更加突出的特征图像。仿真结果表明,该方法在划碰伤、果梗/花萼、完好果的苹果果实检测方面平均识别率可达96%,且在划碰伤方面识别率可达92%,而在果梗、花萼及完好果的检测方面识别率可高达100%,完全满足苹果在线检测分级的需要。     

考虑多种负荷方式的配电网络重构

提出了考虑多种负荷方式的配电网络重构算法.用最大负荷、最小负荷和一般负荷方式模拟研究时段内负荷的变化,首先按照上述三种负荷方式,采用改进支路交换法对配电网络分别进行重构,得到每种负荷方式下的最优重构方案;然后计算出每种最优重构方案下考虑三种负荷方式的加权平均有功损耗;具有最小平均有功损耗的重构方案即为该研究时段内的最优重构方案.所提算法避免了只考虑单一负荷方式的片面性,算例结果表明了该算法的有效性和可行性.     

JRLX/T型碳纤维复合芯导线的特性及工程应用

碳纤维复合芯导线因材料和结构与一般钢芯铝绞线不同,其应力、弧垂特性、输送容量、电能损耗等具有明显的优越性。从不同设计条件下的10 000多个导线应力弧垂计算数据中摘录了一些有代表性的数据,分析了该导线在输电线路新建、增容改造工程中的应用,阐明了该导线的实用性和经济性。