Materials Literature
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摘要： 使用自主设计的高效平面滚压刀具对纯铜进行表面制造，利用塑性变形诱导在纯铜表面制备梯度纳米结构；采用金相显微镜、透射电子显微镜等对梯度纳米结构进行表征，量化变形强化层厚度，考察晶粒尺寸分布；对梯度纳米结构的磨损行为进行研究，并解释了相关机理。结果表明，滚压诱导后表层纳米晶粒细化小于20 nm，并随深度逐渐增至基体晶粒尺寸，形成了十分明显的梯度结构，同时具有较为理想的表面粗糙度和截面硬度分布；干摩擦试验表明，低载时梯度纳米结构具有较好抗粘着能力，摩擦性能较好；高载时由于表层纳米结构强烈变形，微碎裂及随后的三体磨损反而降低了摩擦性能。
Made available in DSpace on 2018-01-24T22:13:11Z (GMT). No. of bitstreams: 1\nPProductionofCelluloseNanofibers....pdf: 1068024 bytes, checksum: 419bb3e14ba972d0969e9514c17b3370 (MD5)\n Previous issue date: 2018-01-23
Enhanced conversion efficiency with reduced cost of thin film solar cell is the primary objective of the scientific community. Light trapping mechanism is essential which have been explored and improved the performance of the solar cell. Past few decades, the plasmonic solar cell has been investigated in which activel…
The academic meanings of infrared imaging fiber bundles were researched and their fabrication technologies were given. A kinds of flexible chalcogenide infrared imaging fiber bundles were fabricated, and their characteristics were tested. By taking As40S58Se2and As40S60as the rod and tube materials, the fibers were dr…
Карагандинский государственный технический университет, Караганда
摘要： 针对注塑成型短玻纤增强复合材料，研究二阶纤维取向张量与纤维取向角度之间的连续函数关系，建立纤维均质化RVE模型。基于Taguchi正交试验设计方法，利用DIGIMAT软件对短玻纤增强复合材料RVE模型进行仿真试验，定量分析纤维质量分数（A）、纤维长径比（B）和纤维取向张量（C）对短玻纤增强复合材料力学性能的影响规律。考虑注塑成型过程中的纤维分层效应，提出了夹芯分层模型并进行铺层设计。基于灰箱理论和反求工程，选取纤维长径比、表层厚度比和芯层厚度比、表层纤维取向张量、纤维取向矢量旋转角四个影响因素，反演预测短玻纤增强复合材料PA66（GF50）正交各向异性弹性常数，与材料拉伸弹性模量E33、泊松比u31和泊松比u32的试验结果…
The trademarked Papermorphosis technology, consisting of two novel units for separately increasing cross direction (CD) and machine direction (MD) elongation over purely mechanical processes, has been successfully tested on recycling fiber, reaching high elongation values in each direction of over 15% in CD or 20% in…
Technical paper presented at the 2017 Defence and Security Doctoral Symposium. The possibility of combining the flexibility and light-weight of polymers with the highest insulation and dielectric permittivity of ceramics, drives the field of nanocomposites for potential commercial application. The inclusion of nano-si…
With the scarcity of fresh water, desalination is an important instrument to be considered for the production of non-salinized water through waste heat in the dual use of nuclear reactors.The gap that this study seeks to fill is related to the use of bibliometric method, based on information structure, about the scien…
Bu almada, kimyasal buhar ktrme metodu (CVD) ile sentezlenen karbon nanotpler (KNT) titanyum dioksit (TiO2) matrisi ierisine arlka %0.1, 0.2, 1 ve 2 oranlarnda takviye edilmilerdir. Elde edilen numunelerin yapsal karakterizasyonu Taramal elektron mikroskobu (SEM) kullanlarak yaplmtr. Numunelerin scakla bal elektriksel…
Inthis study, it was investigated that the effects of glass-mat on mechanicalanisotropy in bidirectional e-glass woven roving reinforced composite sheetsproduced by RTM method. Resin Transfer Molding (RTM) process with acomputer-controlled laboratory-scale was established for this purpose. Inaddition, the RTM mold was…
The conception and evaluation indices of the bearing capacity of the concrete pavement field floor are analyzed in this paper. In order to get the damage process of the concrete panel, its tension and compression injury factors are derived, and a field floor structural dynamic model with concrete damage constitutive r…
Bu çalışmada,ilk olarak baskılı ofis kâğıtları üzerinde farklı aşamalarda hamurlaştırmaişlemi yapılmıştır. Bu işlemin ardından ise mürekkep giderme işlemlerigerçekleştirilmiştir. Bu işlemde hamurlaştırma ve süspansiyon hazırlamaaşamalarında farklı oranlarda kimyasal ve enzimler katılmış ve bunlarınetkileri analiz edil…
The objective of this study was to determine the potassium (K) release kinetics of sandy soil sample representative soil of Egyptian new reclaimed areas as affected by treatments of different rates of compost and chemical fertilizers applied individually or mixture of both type sand the effect of two irrigation regime…
The article aims to present the manner in which welding processes are modelled using dedicated software programmes, provides examples concerning applications of various heat sources and indicates the necessity of performing tests aimed to increase the consistence of simulation results with those obtained in experiment…
Cellulose-based hydrogels - three dimensional "solid" structures composed primarily of liquid water and held together by an interconnected polymer network - were created by first functionalizing carboxymethyl cellulose (CMC), a cellulose derivative, with carbic anhydride in a basic aqueous reaction with the intent of…
(DFT) OPBE/TZVP Gaussian09 (5757) Mn II , Fe II , Co II , Ni II , Cu II Zn II , , MN 2 S 2 . , 5- , ( Co II ) . 7- , 7- , , , 7- , . , M-Hal 180, .
El objetivo de este estudio fue sintetizar nanopartículas de plata con métodos de química verde, combinando extractos de plantas. En la primera etapa se sintetizaron nanopartículas de plata a partir de AgNO3 10 mM con un extracto acuoso de cilantro al 5 %. En la segunda etapa se colocó el látex de sangre de drago al 1…
Mathematical models play an essential role in simulation of dynamic processes as they provide insights into the description and behaviour of real systems. Models of chemical processes are derived from laws of conservation, thermodynamic, and control design. In the present paper, we study the modelling of dissolution p…
The equilibrium concentrations of SiHCl3 and SiCl4 in the SiCl4–H2 system are investigated on the basis of thermodynamic data for the corresponding pure compositions under specified thermodynamic parameters. Eight independent reactions in the SiCl4–H2 system for hydrogenation of SiCl4 to SiHCl3 are obtained. Furthermo…