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排序方式: 共有171条查询结果,搜索用时 15 毫秒
61.
Shalendra Kumar Faheem Ahmed M.S. Anwar B.H. Koo H.K. Choi S. Gautam K.H. Chae Hanshik Chung 《Ceramics International》2013,39(2):1645-1650
Thin films of pure and Ti doped Mg0.95Mn0.05Fe2O4 deposited using pulsed laser deposition technique, have been characterized using X-ray diffraction, Raman spectroscopy, dc magnetization, atomic force microscopy, magnetic force microscopy and near edge X-ray absorption fine structure spectroscopy measurements. X-ray diffraction and Raman spectroscopy measurements indicate that both the films have single phase and the polycrystalline behavior with FCC structure. The grain size calculated using XRD data was 18 and 27 nm for pure and Ti doped films, respectively. Magnetic measurements reflect that pure film has superparamagnetic behavior while Ti doped film has soft ferrimagnetic behavior at room temperature. Atomic force microscopy measurements indicate that both the films are nanocrystalline in nature. Near edge X-ray absorption fine structure spectroscopy measurements clearly infer that Fe ions are in mixed valence state. 相似文献
62.
Faheem A. Sheikh Nasser A.M. Barakat Byoung-Suhk Kim Santosh Aryal Myung-Seob Khil Hak-Yong Kim 《Materials science & engineering. C, Materials for biological applications》2009,29(3):869-876
In the present study, spherical nanoparticles (NPs) containing polyhedral oligosilsesquioxane (POSS) as an inner hydrophobic core and poly(vinyl alcohol) PVA as a hydrophilic outer shell were prepared by dialysis approach. Preparation of amphiphilic POSS-grafted-PVA co-polymer was characterized by 1H NMR and FT-IR. The results indicated urethane linkage between monoisocyanate group of POSS macromer and the hydroxyl groups of PVA. The dynamic light scattering (DLS) and electrophoretic light scattering (ELS) of the NPs revealed that they have an average hydrodynamic diameter and negative zeta (ζ)-potential of 215 nm and ? 161 mV, respectively. Atomic force microscopy (AFM) and bio-transmission electron microscope (BIO-TEM) have shown unagglomerated NPs within a diameter range of 60–90 nm. The prepared NPs were investigated to improve the control release of anticancer drug; paclitaxel as a model drug. Due to drug loading, the hydrodynamic diameter and negative zeta (ζ)-potential have changed to 325 nm and ? 14 mV, respectively. In addition, in-vitro drug release experiments were conducted; the obtained results explicated continuous release for over 40 days. However, in case of using pure drug only, the drug completely released within 1 h. 相似文献
63.
Ershad Sheibani Susan E. Duncan David D. Kuhn Andrea M. Dietrich Sean F. O'Keefe 《Journal of food science》2016,81(2):C348-C358
Simultaneous distillation‐extraction (SDE) and solid phase micro extraction (SPME) are procedures used for the isolation of flavor compounds in foods. The purpose of this study was to optimize SDE conditions (solvent and time) and to compare SDE with SPME for the isolation of flavor compounds in Jin Xuan oolong tea using GC‐MS and GC‐O. The concentration of volatile compounds isolated with diethyl ether was higher (P < 0.05) than for dichloromethane and concentration was higher at 40 min (P < 0.05) than 20 or 60 min extractions. For SDE, 128 volatiles were identified using GC‐MS and 45 aroma active compounds using GC‐O. Trans‐nerolidol was the most abundant compound in oolong tea. The number of volatiles identified using GC‐MS was lower in SPME than SDE. For SPME, 59 volatiles and 41 aroma active compounds were identified. The composition of the volatiles isolated by the 2 methods differed considerably but provided complementary information. 相似文献
64.
Faheem Akram M. Plummer J.D. Shott J.D. 《IEEE transactions on instrumentation and measurement》1993,42(5):893-898
A new technique is presented for accurate measurement of the output conductance of a metal-oxide semiconductor field effect transistor (MOSFET). This technique allows the measurement of output conductance down to the sub μS region with an accuracy of better than 1%. Measurements in this range of output conductance are plagued by stray capacitances and noise. The new technique effectively combats these sources of error. The above-mentioned accuracy is maintained even when the susceptance due to the stray capacitance is as much as five times the conductance being measured 相似文献
65.
Wireless Networks - In the absence of Internet connectivity, a content-centric opportunistic network can be established by mobile human-held devices. However, to save battery, buffer, and bandwidth... 相似文献
66.
Software product line engineering is an inter-disciplinary concept. It spans the dimensions of business, architecture, process,
and the organization. Some of the potential benefits of this approach include cost reduction, improvements in product quality
and a decrease in product development time. The increasing popularity of software product line engineering in the software
industry necessitates a process maturity evaluation methodology. Accordingly, this paper presents an organizational maturity
model of software product line engineering for evaluating the maturity of organizational dimension. The model assumes that
organizational theories, behavior, and management play a critical role in the institutionalization of software product line
engineering within an organization. Assessment questionnaires and a rating methodology comprise the framework of this model.
The objective and design of the questionnaires are to collect information about the software product line engineering process
from the dual perspectives of organizational behavior and management. Furthermore, we conducted two case studies and reported
the assessment results using the organizational maturity model presented in this paper. 相似文献
67.
Kyoseung Sim Zhoulyu Rao Faheem Ershad Cunjiang Yu 《Advanced materials (Deerfield Beach, Fla.)》2020,32(15):1902417
Stretchable electronics outperform existing rigid and bulky electronics and benefit a wide range of species, including humans, machines, and robots, whose activities are associated with large mechanical deformation and strain. Due to the nonstretchable nature of most electronic materials, in particular semiconductors, stretchable electronics are mostly realized through the strategies of architectural engineering to accommodate mechanical stretching rather than imposing strain into the materials directly. On the other hand, recent development of stretchable electronics by creating them entirely from stretchable elastomeric electronic materials, i.e., rubbery electronics, suggests a feasible a venue. Rubbery electronics have gained increasing interest due to the unique advantages that they and their associated manufacturing technologies have offered. This work reviews the recent progress in developing rubbery electronics, including the crucial stretchable elastomeric materials of rubbery conductors, rubbery semiconductors, and rubbery dielectrics. Thereafter, various rubbery electronics such as rubbery transistors, integrated electronics, rubbery optoelectronic devices, and rubbery sensors are discussed. 相似文献
68.
Clays, Nanoclays, and Montmorillonite Minerals 总被引:1,自引:0,他引:1
Faheem Uddin 《Metallurgical and Materials Transactions A》2008,39(12):2804-2814
69.
The present research describes a modified sol–gel technique used to obtain nano-crystalline lead zirconate titanate (PZT) powders by using triethanolamine (TEA) as a polymerizing agent. The metal ions chemically interacted with TEA in the precursor sol and gel under refluxing conditions. Drying and aging treatments led to development of a precursor–polymeric gel network. A single-phase perovskite structure was formed at 470°C. The PZT gel and powders were characterized by using X-ray diffraction, simultaneous thermal analysis, and Fourier transform infrared spectroscopic techniques. The nano-crystalline morphology was examined by using a transmission electron microscope (TEM). The average particle size determined from TEM was less than 15 nm. 相似文献
70.
Ye Yuan Yajie Yang Muhammad Faheem Xiaoqin Zou Xujiao Ma Zeyu Wang Qinghao Meng Lili Wang Shuai Zhao Guangshan Zhu 《Advanced materials (Deerfield Beach, Fla.)》2018,30(27)
Artificially designed enzymes are in demand as ideal catalysts for industrial production but their dense structure conceals most of their functional fragments, thus detracting from performance. Here, molecularly imprinted porous aromatic frameworks (MIPAFs) which are exploited to incorporate full host–guest interactions of porous materials within the artificial enzymes are presented. By decorating a porous skeleton with molecularly imprinted complexes, it is demonstrated that MIPAFs are porous artificial enzymes possessing excellent kinetics for guest molecules. In addition, due to the abundance of accessible sites, MIPAFs can perform a wide range of sequential processes such as substrate hydrolysis and product transport. Through its two functional sites in tandem, the MIPAF subsequently manifests both hydrolysis and transport behaviors. Advantageously, the obtained catalytic rate is ≈58 times higher than that of all other conventional artificial enzymes and even surpasses by 14 times the rate for natural organophosphorus hydrolase (Flavobacterium sp. strain ATCC 27551). 相似文献