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Search Results: 1 - 10 of 10156 matches for " Yajie Qian "
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Binding of Bezafibrate to Human Serum Albumin: Insight into the Non-Covalent Interaction of an Emerging Contaminant with Biomacromolecules
Yajie Qian,Xuefei Zhou,Jiabin Chen,Yalei Zhang
Molecules , 2012, DOI: 10.3390/molecules17066821
Abstract: In recent years, bezafibrate (BZF) has been frequently detected in environmental media. In order to reveal the toxicity of such an emerging pollutant, its interaction with human serum albumin (HSA) was studied by fluorescence spectrometry, circular dichroism, and equilibrium dialysis. Fluorescence data showed that the fluorescence quenching of HSA by BZF resulted from the formation of HSA-BZF complex. The binding constants were determined to be 3.33 × 103, 2.84 × 103 M?1 at 298 and 309.5 K, respectively. The thermodynamic determination indicated that the hydrophobic and electrostatic interaction were the dominant binding force. The conformational investigation showed that the presence of BZF increased the α-helix content of HSA and induced the slight unfolding of the polypeptides of protein. Finally, the equilibrium dialysis showed that 0.56 mM BZF decreased the binding of vitamin B2 to HSA by 29%.
The Qualitative Analysis for a Class Nonlinear Systems with High Degree  [PDF]
Songlin Chen, Yajie Du
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.65087
Abstract: In the paper, the problems of identification of focus or center for a class of nonlinear systems are studied. As results, the identifying rule for the type of singular point of the system and the calculating formula for the focus value are obtained by the classical theory of Poincare and Lyapunov. At the end, the numerical simulation for a polynomial system of seven-degree are showed to corroborate the theoretical results of the method.
A Facile Method for Preparing Transparent, Conductive, and Paper-Like Silver Nanowire Films
Yajie Wang,Tao Feng,Kai Wang,Min Qian,Yiwei Chen,Zhuo Sun
Journal of Nanomaterials , 2011, DOI: 10.1155/2011/935218
Abstract: Transparent, conductive, and flexible silver nanowire (AgNW) films have been fabricated by a facile two-step method. Firstly, the well-dispersed AgNW suspension is vacuum filtered using mixed esters of cellulose (MCE) membranes as filters. Then, the AgNW-MCE films are treated with acetone vapor. After the infiltration of acetone vapor, the white and porous MCE membranes change into transparent and pore-free, and AgNW-MCE films are obtained with extraordinary optical, conductive, and mechanical properties. An optimal result is obtained with transmittance of 85% at 550?nm and sheet resistance about 50?Ohm/sq. The flexibility of AgNW-MCE films is remarkable, which is comparable to that of the AgNW film on flexible polyethylene terephthalate (PET). More important, AgNW-MCE films show an excellent adhesion to the substrate, which causes a stable electrical conductivity even after scotch tape test and finger friction test. As a result of improved adhesion to the substrate, the sheet resistance of AgNW-MCE films is about 20% smaller than that of AgNW-PET films. 1. Introduction Nowadays, as optoelectronic technology will move toward flexible and paper-like devices, great efforts have been made to search for suitable electrode materials which can be formed into films at low temperature and used in such applications. As we all know, indium tin oxide (ITO) as the most important transparent and conductive film (TCF) has been widely used in optoelectronics for 50 years, but it is completely unsuitable to flexible devices because of its brittle nature [1]. To our excitement, many promising materials have been emerging such as graphenes, carbon nanotubes, and metal nanowires [2–6]. For these materials, one of the most important advantages is that the flexibility does not come at the cost of performance in terms of sheet resistance and transparency [7]. Among these materials, random networks of AgNW, owing to its highest electrical conductivity and optical transparency, are the most promising replacement for ITO [4–6]. More recently, flexible AgNW electrodes have been fabricated and successfully used in organic solar cells [8] and organic light emitting devices [9], and the performance of the electrode in terms of sheet resistance and transparency can match ITO. However, to be used in optoelectronic devices, the AgNW film should have a strong adhesion to the substrate, which is hard to achieve while AgNW films deposited on plastic substrate without further treatments [4]. Although some methods including encapsulation [5] and burying AgNW networks [9] have been taken to
Kaldi+PDNN: Building DNN-based ASR Systems with Kaldi and PDNN
Yajie Miao
Computer Science , 2014,
Abstract: The Kaldi toolkit is becoming popular for constructing automated speech recognition (ASR) systems. Meanwhile, in recent years, deep neural networks (DNNs) have shown state-of-the-art performance on various ASR tasks. This document describes our open-source recipes to implement fully-fledged DNN acoustic modeling using Kaldi and PDNN. PDNN is a lightweight deep learning toolkit developed under the Theano environment. Using these recipes, we can build up multiple systems including DNN hybrid systems, convolutional neural network (CNN) systems and bottleneck feature systems. These recipes are directly based on the Kaldi Switchboard 110-hour setup. However, adapting them to new datasets is easy to achieve.
Synthesis, assembly and device of 1-dimentional nanostructures
Yajie Dong,Yadong Li
Chinese Science Bulletin , 2002, DOI: 10.1007/BF02907598
Abstract: Synthesis and assembly of 1-dimentional (1-D) nanostructures and measurement of their electrical and optical properties are very important in fabrication of nanodevices. Recent developments in this field are summarized in this review. The assembling methods can be divided into two classes: assembly using macroscopic field forces and microfluidic-assisted-template-integration. The former can assemble nanowires by controlling direction and intensity of electric or magnetic field, while the latter represents a general assembly strategy for any kind of 1-D nanostructures. The assembly of 1-D nanostructures will make it possible to fabricate nanosensors, nanolasers and nanoscale logic gate circuits for computation.
Study on Knowledge Innovation Management of Enterprise
Liping Fu,Yajie Gu
International Journal of Business and Management , 2009,
Abstract: In knowledge economy, a key source of sustainable competitive advantage is how a company creates and shares its knowledge. Taking knowledge as the basal management factor, knowledge management emerges with the tide of knowledge economy. The ultimate purpose of knowledge management is to improve the capability of knowledge innovation. This paper firstly gives an overview of knowledge management, introduces the definition and concept, then gives detailed research on the process of knowledge innovation, finally the paper puts forward some idiographic measures of knowledge innovation management.
On the Motivation and the English Achievement in the Senior Middle School
Yajie Su,Yanli Wang
Asian Social Science , 2009, DOI: 10.5539/ass.v5n2p69
Abstract: Motivation is one of the important factors that influences English learning achievement. That’s true of the students in the Senior Middle School. In order to improve the students’ English performance, a research by means of a questionnaire and an interview is done in a key Senior School on the motivation in learning English in order to improve the English teaching. The results showed that the motivation has a close relationship with the students’ performance. But the different strength in motivation will lead to different learning efficiency. So to help the students to maintain a proper strength in English learning motivation is very necessary for the teachers in the daily teaching procedure. Finally, some suggestions are available to the teachers.
A Lexicographic Approach to Postdisaster Relief Logistics Planning Considering Fill Rates and Costs under Uncertainty
Yajie Liu,Bo Guo
Mathematical Problems in Engineering , 2014, DOI: 10.1155/2014/939853
Abstract: Predicting the occurrences of earthquakes is difficult, but because they often bring huge catastrophes, it is necessary to launch relief logistics campaigns soon after they occur. This paper proposes a stochastic optimization model for post-disaster relief logistics to guide the strategic planning with respect to the locations of temporary facilities, the mobilization levels of relief supplies, and the deployment of transportation assets with uncertainty on demands. In addition, delivery plans for relief supplies and evacuation plans for critical population have been developed for each scenario. Two objectives are featured in the proposed model: maximizing the expected minimal fill rate of affected areas, where the mismatching distribution among correlated relief demands is penalized, and minimizing the expected total cost. An approximate lexicographic approach is here used to transform the bi-objective stochastic programming model into a sequence of single objective stochastic programming models, and scenario-decomposition-based heuristic algorithms are furthermore developed to solve these transformed models. The feasibility of the proposed bi-objective stochastic model has been demonstrated empirically, and the effectiveness of the developed solution algorithms has also been evaluated and compared to that of commercial mixed-integer optimization software. 1. Introduction Earthquakes are a special type of natural disaster that can result in huge catastrophes. The Great Sichuan Earthquake, which occurred on May 12, 2008, in Wenchuan County, Sichuan Province, China, was one such case. It had a recorded magnitude of 8.0 and imposed tremendous suffering on the local residents, causing over 69,000 deaths, 18,000 missing persons cases, 374,000 injuries, and huge loss of property. Although thousands of networked seismograph stations have been installed around the world and although these stations use powerful computers, it is still difficult to predict when and where an earthquake will strike. Therefore, an effective and necessary approach coping with an earthquake disaster is to plan and implement a disaster relief campaign that would reduce the damage right after the earthquake disaster takes place. Emergency logistics plays a vital role in disaster relief campaigns. However, the planning and implementation of relief logistics are challenging, especially when help is needed in mountainous areas, where the transportation infrastructure, such as roads, bridges and railway lines, can suffer severe damage after large earthquakes. The following three factors
On the Implications of Recent Observations of the Inner Knot in the Crab Nebula
Yajie Yuan,Roger Blandford
Physics , 2015, DOI: 10.1093/mnras/stv2093
Abstract: Recent observations of the Crab Nebula (Rudy et al 2015) have maintained its reputation for high energy astrophysical enlightenment and its use as a testbed for theories of the behaviour of magnetized, relativistic plasma. In particular, new observations of the inner knot located 0.65" SE from the pulsar confirm that it is compact, elongated transversely to the symmetry axis and curved concave towards the pulsar. 60 percent polarization has been measured along the symmetry axis (Moran et al 2013). The knot does not appear to be involved in the gamma ray flares. The new observations both reinforce the interpretation of the knot as dissipation of the pulsar wind at a strong shock and challenge the details of existing models of this process. In particular, it is argued that the compactness, high polarization and curvature are difficult to reconcile with simple relativistic shock models. Alternative possibilities include deflection of the outflow ahead of the shock and spatial variation in which the knot is interpreted as a caustic. Some future observations are proposed and new theoretical investigations are suggested.
Is Uniportal More Advantageous Than Three Portal in Alleviating Acute and Chronic Pain after Lobectomy?
Hecheng LI, Yajie ZHANG
- , 2018, DOI: : 10.3779/j.issn.1009-3419.2018.04.10
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