热处理工艺对2.25Cr1MoR钢组织和力学性能的影响

本文研究了热处理工艺对2.25C r1M oR钢组织和力学性能的影响。结果表明,该钢在780℃时可获得良好的强韧化效果和较高的抗回火脆性能力,在此基础上得到了该钢板生产制造的热处理工艺参数。实践证明,该工艺合理可行。     

燃氢发动机与汽油机的车用性能对比和分析

借助数学模型和数字仿真,对燃氢发动机的稳态特性和动态特性进行分析研究。研究表明,与汽油机相比,氢气机表现了卓越的稳态性能。氢燃料特有的高热值和良好的燃烧性能,使氢气机的过渡过程特性尤为优良。它适于车辆特别是战车的动力源。由汽油机改装为氢气机是方便的。     

合成反应时间对LGV无铬木质素降粘剂性能的影响

报导了合成反应时间对无铬木质素降粘剂LGV特性粘度、吸附、水化、絮凝及降粘性能影响的研究结果。     

Effect of bias voltage on growth property of Cr-DLC film prepared by linear ion beam deposition technique

Cr-containing diamond-like carbon films were deposited on silicon wafers by a combined linear ion beam and DC magnetron sputtering. The influence of the bias voltage on the growth rate, atomic bond structure, surface topography and mechanical properties of the films were investigated by SEM, XPS, Raman spectroscopy, AFM, and nano-indentation. It was shown that the chromium concentration of the films increased with negative bias voltage and that a carbide phase was detected in the as-deposited films. The surface topography of the films evolved from a rough surface with larger hillocks reducing to form a smoother flat surface as the bias voltage increased from 0 to −200 V. The highest hardness and elastic modulus were obtained at a bias voltage of about −50 V, while the maximum sp³ bonding fraction was acquired at −100 V. It was suggested that the mechanical properties of the films not only depended on the sp³ bonding fraction in the films but also correlated with the influence of Cr doping and ion bombardment.     

亚麻抗倒伏性状分析及培土对亚麻抗倒伏的影响

对亚麻抗倒伏机理及抗倒伏栽培技术研究表明：（1）采用倒伏指数能较好地反映亚麻抗倒伏能力,用倒伏程度能客观准确地评价亚麻倒伏的实际情况。（2）亚麻的抗倒伏能力与一级分枝长、一级分枝角度、单茎鲜重、冠层鲜重、冠层附着水量、倒伏指数、单株分茎数、根系鲜重,根系干重等性状呈负相关。与茎粗、茎秆抗折力、茎秆干重等性状呈正相关。（3）与倒伏程度关系最密切的几个性状中,茎秆抗折力对倒伏程度的直接作用最大,其次为茎粗和单茎鲜重。（4）快速生长期至现蕾期培土,可降低植株重心高度,使倒伏程度降低9.12%,比不培土的单株平均产量高16.21%,粒重增加2.68%,果粒数增加9.24%,单位面积产量高14.67%,而且差异达显著或极显著水平,但经济系数、株高、纤维的工艺长度等性状无明显变化,培土措施对抗倒伏能力差的品种效果较好,而对抗倒伏能力强的品种作用较小。     

复合多层织物的热湿性能分析

随着科学技术的发展与进步，纺织品的功能性和舒适性也随之不断扩充和完善。文中介绍了最新的一些纺织材料热湿性能研究成果，并对不同结构的吸湿排汗复合双层织物进行了讨论，而且运用相关的热湿耦合模型全面分析了各种结构的织物在穿着情况下的热湿性能。发现当疏水性纤维材料置于织物内层时有明显的吸湿排汗效果。     

木棉纤维与棉纤维结构性能的比较

研究木棉纤维的结构与性能.测试了木棉纤维的长度、线密度、外观形貌、红外光谱、X射线衍射图及拉伸性能,并与棉纤维进行对比分析.结果表明:木棉纤维长度在20 mm左右,线密度约0.68 dtex,投影宽度接近细绒棉,无天然转曲,中空度达90%;木棉纤维中存在有木质素;木棉纤维与棉纤维同属于纤维素Ⅰ晶型,结晶度为46.4%;其强力与断裂伸长率明显小于棉纤维.     

Influence of glycerol and water activity on the properties of compressed egg white-based bioplastics

In this paper, the effects of glycerol (35%, 40% and 45%) and water activity (0.34 and 0.48) on the physical, mechanical and morphological properties of compressed egg white-based bioplastics are investigated. Lighter, more reddish and less yellowish sheets with a decreased thickness and second-order transition temperature, improved mechanical properties (increased flexibility and decreased rigidity and stiffness) and constant moisture content can be obtained by increasing water activity. Increasing the GLY content results in the same type of changes but to a lesser extent and increased moisture content. Increasing both, water activity and GLY, leads to a more pronounced effect for some properties. This study demonstrates that compressed egg white-based bioplastics with desired properties can be obtained by adjusting water activity and GLY content during their synthesis.     

乙酰化马铃薯微晶淀粉的制备及性能

为改善马铃薯淀粉性能,拓宽其应用领域,对马铃薯淀粉进行微晶化和乙酰化复合改性。本文以马铃薯淀粉为原料、盐酸为酸解剂、醋酸酐为乙酰化试剂、氢氧化钠为催化剂对乙酰化马铃薯微晶淀粉的制备和性能进行了研究。结果表明:马铃薯淀粉经微晶化及乙酰化后,其抗酸性、抗碱性和冷热黏度稳定性增强,但其凝沉性、冻融稳定性、蓝值和起始分解温度降低。马铃薯微晶淀粉结构为B型,乙酰化对马铃薯淀粉微晶结构有影响。     

冬虫夏草及其多糖的研究与应用进展

本文概述了冬虫夏草的主要营养组分、虫草多糖的提取工艺、性能、药用功效及应用等方面的研究进展.