原位纳米增强高强韧钢氢脆性能研究

We investigated the critical influence of in-situ nanoparticles on the mechanical properties and hydrogen embrittlement (HE) of high-strength steel. The results reveal that the mechanical strength and elongation of quenched and tempered steel (919 MPa yield strength, 17.11% elongation) are greater than those of hot-rolled steel (690 MPa yield strength, 16.81% elongation) due to the strengthening effect of in-situ Ti₃O₅–Nb(C,N) nanoparticles. In addition, the HE susceptibility is substantially mitigated to 55.52%, approximately 30% lower than that of steels without in-situ nanoparticles (84.04%), which we attribute to the heterogeneous nucleation of the Ti₃O₅ nanoparticles increasing the density of the carbides. Compared with hard TiN inclusions, the spherical and soft Al₂O₃–MnS core–shell inclusions that nucleate on in-situ Al₂O₃ particles could also suppress HE. In-situ nanoparticles generated by the regional trace-element supply have strong potential for the development of high-strength and hydrogen-resistant steels.     

工业机器人功率等效模型与参数辨识

针对工业机器人能耗复杂,动态性强,实时功率难以预测的问题,在对机器人系统中永磁同步电机、伺服驱动器等功能部件能耗分析的基础上,提出了工业机器人功率等效模型.该模型通过高阶多项式建立起机器人损耗功率与电机扭矩、电机角速度的映射关系,其系数通过最小二乘法求解,可以在机器人电机参数未知的条件下进行功率预测.结果表明,基于功率模型的理论计算值和实验测量值的均方根相对误差为8.11％,证明了功率模型和辨识参数的正确性.     

Review of the fatigue behavior of hard coating–ductile substrate systems

With the wide application of coating materials in aerospace and other fields, their safety under fatigue conditions in service is important.However, research on the fatigue properties of ceramic hard coatings started late, and a unified standard is yet to be established to evaluate the fatigue life of hard coating–ductile substrate systems.Studies also present different opinions on whether coatings can improve or reduce the fatigue life of substrates.In this paper, the influence of the properties of ceramic coatings on fatigue performance is reviewed, and the effects of coating on the mechanism of fatigue crack initiation in substrates are discussed, aiming to help readers understand the fatigue behavior of hard coating–ductile substrate systems.     

两种介质断裂问题各阶应力强度因子的直接积分表达

本文把文［１］的思想，推广应用到处理两种介质断裂问题的两种特殊情形。同时指出了专著［２］的某些错误。     

Changes of Soil Enzyme Activities in Different Restoration Ages of Spruce Forests on the Eastern Qinghai-Tibet Plateau

Six soil enzymes (invertase, acid phosphatase, proteinase, catalase, peroxidase and polyphenoloxidase ) were chosen for investigation under different spruce forests with restoration ages of 4,10,16 years and an old-growth spruce forest over 400 years old in the eastern Qinghai-Tibet Plateau, China. Results showed that the activities of invertase, phosphatase, proteinase, catalase and peroxidase decreased in newly restored forests except for pholyphenoloxidase. With the development of forests after restoration, the activities of invertase, acid phosphadase, proteinase increased gradually. Our study also indicated that the soil enzyme activities were associated with surface soils and decreased with depths. This result suggested that in the earlier restoration stage the application of organic fertilizer may be more effective by surface addition to soils than deep addition.     

基于合作的主动知识外溢策略研究

合作中的知识外溢是客观存在的。知识资产所有者可以变被动知识外溢为主动知识外溢 ,利用知识外溢达成显示合作意向、塑造合作声誉、推动合作成功的目的 ,并通过两个博弈模型加以说明 :一是通过主动外溢传递合作信号 ,合作收益期望门槛降低 ,双方合作意愿加强 ;二是少量多批次外溢知识 ,可形成动态重复博弈 ,降低对合作成功度的要求 ,促成合作的成功     

Fluorescence study on the interaction between apoCopC and cupric

The interaction between apoCopC and cupric was investigated by fluorescence spectra, in phosphate （20 mmol/L） buffer at pH 6.0. Results suggest that the environment is measured to be hydrophobic completely around tryptophan （83）. At the same time, apoCopC fluorescence at 320 nm was significantly quenched with the addition of cupric and the 1：1 stoichiometric ratio of apoCopC to cupric was confirmed by fluorescence. In addition, the conditional binding constants were calculated to be Kcu-copc=（1.8±0.58）×10^13 mol^-1 L on the basis of the results of fluorescence titration curves. The apoCopC has the ability to bind specifically cupric ion.     

农技高师图书馆藏书结构的改革与建设

详细总结与论证了作为河北农业技术师范学院办学支柱之一的图书馆的藏书结构１０余年的改革与建设过程；总结和论证了农技高师图书馆藏书建设工作所要掌握的五项基本原则及其执行过程；总结和论证了河北农业技术师范学院图书馆藏书形成的四级结构模式及其利用情况     

2—壬基咪唑在铜表面形成覆膜的化学结构及其热稳定性

通过模型络合物方法及傅利叶转换红外光谱，热失重分析等手段，研究了２－壬基咪唑在过渡金属铜表面形成覆膜的化学结构及其热稳定性；进一步论证并提出了该覆膜结构；探讨了该覆膜耐热性及覆膜受热分解温度与２－壬基咪唑铜模型络合物第一分解温度的关系。本研究对开发该类特异覆膜具有实用及学术价值。     

Loss of cytosolic serine hydroxymethyltransferase in a formate mutant ofNeurospora crassa

Summary In the wild type ofNeurospora crassa serine hydroxymethyltransferase occurs in the cytosol and mitochondria. The formate mutant (FGSC 9) lacks the cytosolic activity but has increased levels of isocitrate lyase and glyoxylate aminotransferase. Glycine is derived from glyoxylate in the mutant.