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71.
Avdeev M. V. Bodnarchuk V. I. Petrenko V. I. Gapon I. V. Tomchuk O. V. Nagorny A. V. Ulyanov V. A. Bulavin L. A. Aksenov V. L. 《Crystallography Reports》2017,62(6):1002-1008
Crystallography Reports - A new time-of-flight neutron reflectometer GRAINS with a horizontal sample plane (vertical scattering plane) has recently been put into operation at the pulsed reactor... 相似文献
72.
The method of slow-neutron transmission is used to investigate the behavior of the numerical density of3He in the binary solution 2.46%3He + 97.54% CO20 on the liquid-vapor boundary curve. Data on the numerical density are analyzed within the framework of the expanded theory of scale transformations.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 63–67, September, 1983 相似文献
73.
铸造铝青铜合金Cu-14Al-4Fe-Mn的摩擦磨损性能 总被引:7,自引:1,他引:7
用往复式摩擦磨损试验机考察了新型高强度、高耐磨性铸造铝青铜合金Cu-14Al-4Fe-Mn(代号HSWAB)的摩擦磨损性能,利用形貌扫描电子显微镜观察分析了合金磨损表面形貌,探讨了其磨损机理.结果表明,HSWAB合金在干摩擦和油润滑条件下的摩擦磨损性能及磨损机理存在明显差异.在干摩擦条件下,合金中脱落的硬质点及氧化物等磨粒导致较为严重的磨粒磨损,摩擦系数高、磨损率大,主要磨损机理为磨粒磨损、粘着磨损、氧化磨损及疲劳磨损.在油润滑条件下,摩擦系数和磨损率均显著降低,疲劳磨损和氧化磨损受到抑制,主要磨损机理为磨粒磨损和粘着磨损.Cu-14Al-4Fe-Mn合金在油润滑条件下的摩擦系数低达0.08,磨损率低达3.7×10-6g/m,是一种优良的耐磨材料. 相似文献
74.
Alekseev A. N. Zabashta Yu. F. Kovalchuk V. I. Andrusenko D. A. Bulavin L. A. 《Technical Physics》2020,65(6):1006-1009
Technical Physics - A method to experimentally determine the components of complex thermal conductivity for thin polymer films has been developed. It is based on measuring the temperatures of both... 相似文献
75.
铁基大块非晶合金的摩擦磨损性能研究 总被引:6,自引:1,他引:5
采用电弧熔炼、铜模吸铸法制备Fe基大块非晶合金,利用球-盘式摩擦磨损试验机进行干摩擦磨损试验,研究了铸态Fe基大块非晶合金的摩擦磨损行为及热处理对其耐磨性的影响,利用扫描电子显微镜观察合金磨损表面形貌,分析了Fe基大块非晶合金以及相同成分晶态合金的磨损机理.结果表明:在本试验条件下,铸态Fe基大块非晶合金的耐磨性高于相同成分的晶态合金,热处理可以有效提高铸态Fe基大块非晶合金的耐磨性,在保持完全非晶状态的前提下,退火态非晶合金的磨损率较铸态非晶合金减小约40%;材料的结构和性能对合金的摩擦系数影响不大,当进入稳定阶段后Fe基大块非晶合金的摩擦系数稳定在0.58左右;不同处理状态的Fe基大块非晶合金和相同成分晶态合金的磨损机制不同,非晶合金的磨损机制以疲劳磨损为主兼有磨粒磨损,相同成分晶态合金的磨损机制为粘着磨损和磨粒磨损共同作用的结果. 相似文献
76.
乙酸铵离心交换法和乙酸钙离心交换法测定土壤阳离子交换量 总被引:3,自引:0,他引:3
土壤阳离子交换量(CEC)的测定在农业中有重要的意义,对农业行业标准NY/T295—1995和NY/T1121.5—2006中的离心交换法测定土壤中CEC值的方法进行了优化,讨论了不同pH值的土壤样品对两种方法的选择依据,分析了CEC值测定重现性较差的原因。结果表明,pH值的范围是方法选择的重要依据,pH7.0的样品适合用乙酸铵离心交换法,pH≥7.0的样品则适用乙酸钙离心交换法。优化后方法的准确度和精密度有了较大的改善,实验中对各步骤的优化缩短了约40%的操作时间,减少工作量,适合于批量样品的准确测定。 相似文献
77.
Tatyana B. Zheltonozhskaya Olga O. Romankevich Vladimir G. Syromyatnikov Leonid A. Bulavin Vladislav Yu. Kudrya Tymish Yu. Ogul'chansky Valeriy M. Yashchuk 《Macromolecular Symposia》1997,114(1):263-269
The sorption properties of the intramolecular complex - poly(acrylamide) to poly(vinyl alcohol) grafted copolymer (PVA-PAAN) in block state were investigated with respect to a number of compounds. The relatively small molecules of phenol, phenylalanine in water solution as well as nitrobenzene in hexane are strongly absorbed by PVA-PAAN films. The large humine acid molecules (sizes are larger by more than ≈ 10 times) are absorbed by PVA-PAAN very weakly. It was determined the absorption influence on the character of polymer film solution. In a number of cases the oscillation of the dilution and sorption were observed when determining the critical concentrations of guest molecules in the upper layer of polymer films were achieved. The possible mechanisms of absorption were discussed. 相似文献
78.
Eduard Lysenkov Valery Klepko Leonid Bulavin Nikolai Lebovka 《Chemical record (New York, N.Y.)》2024,24(2):e202300166
This review aims to provide a literature overview as well as the authors’ personal account to the studies of Laponite® (Lap)/Polyethylene-oxide (PEO) based composite materials and their applications. These composites can be prepared over a wide range of their mutual concentrations, they are highly water soluble, and have many useful physico-chemical properties. To the readers’ convenience, the contents are subdivided into different sections, related with consideration of PEO properties and its solubility in water, behavior of Lap systems(structure of Lap-platelets, properties of aqueous dispersions of Lap and aging effects in them), analyzing ofproperties LAP/PEO systems, Lap platelets-PEO interactions, adsorption mechanisms, aging effects, aggregation and electrokinetic properties. The different applications of Lap/PEO composites are reviewed. These applications include Lap/PEO based electrolytes for lithium polymer batteries, electrospun nanofibers, environmental, biomedical and biotechnology engineering. Both Lap and PEO are highly biocompatible with living systems and they are non-toxic, non-yellowing, and non-inflammable. Medical applications of Lap/PEO composites in bio-sensing, tissue engineering, drug delivery, cell proliferation, and wound dressings are also discussed. 相似文献
79.
对国家生活饮用水标准检验方法"GB/T5750—2006"中涉及到的水中氨氮的检测条件进行了探讨,讨论了样品的采集与保存,影响显色、空白值的各项因素,并提出相应的解决办法。对国家标准物质以及实际样品的验证表明,方法的相对误差为0.03%~1.5%,相对标准偏差RSD为0.55%~5.3%,准确度也能满足分析要求,对国家标准方法进行了补充与细化,在实际工作中有参考价值。 相似文献
80.
A. V. Nagornyi V. I. Petrenko M. V. Avdeev L. A. Bulavin V. L. Aksenov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2010,4(6):976-981
The possibility to conduct the experiment on small-angle neutron scattering on very dilute magnetic fluids (the volume fraction
of magnetite is ∼0.1%) is discussed. The aim of these experiments is to determine the structural parameters of these fluids
using the Guinier approximation. Primary attention is concentrated on the experimental observation of a nonmagnetic layer
on the surfaces of magnetic nanoparticles dispersed in a liquid carrier. Significant parameters are determined, and conditions
for the experiment on the contrast variation are chosen in model calculations. 相似文献