Nanjing University of Science and Technology

english.njust.edu.cn/
Nanjing, China

Nanjing University of Science and Technology or NUST is one of the national key universities under the Ministry of Industry and Information Technology of China. The university was derived from the Institute of Military Engineering of the PLA, which was the highest institution of military technology in China established in 1953. The institute was successively called Artillery Engineering Institute, Engineering Institute of Eastern China, and East China Institute of Technology, and finally to its current name in 1993. It is a science-oriented university located in Xuanwu District in the east suburban area of Nanjing, China. The university places emphasis on both education and research, and is listed in the national 211 Project. The main campus is located in 200 Xiaolingwei, Xuanwu district, Nanjing, Jiangsu Province, China. Wikipedia.


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Xu Z.,Nanjing Southeast University | Xu Z.,Nanjing University of Science and Technology
IEEE Transactions on Fuzzy Systems | Year: 2012

We investigate multiattribute decision-making problems, where the attribute values are intuitionistic fuzzy values, and the weight information on attributes cannot be known completely. We first define the concepts of the overall attribute ideal solution and the overall attribute negative ideal solution of alternatives. Based on these two solutions, we define the satisfaction degree of each alternative. After that, we establish a multiobjective optimization model and then transform it into a single-objective optimization model. Furthermore, we establish an interactive method for multiattribute decision making with intuitionistic fuzzy information. A numerical example is also given to illustrate the solution processes of our methods. Finally, the extended results in interval-valued intuitionistic fuzzy situations are also pointed out. © 2012 IEEE.


Zhu Y.,Nanjing University of Science and Technology
IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics | Year: 2011

In the case that a system is affected by fuzzy factors, a fuzzy optimal-control problem is proposed. A fuzzy optimal-control problem for a multistage fuzzy system is considered to optimize the expected value of a fuzzy objective function subject to a multistage fuzzy system where, at every stage, the system is disturbed by a fuzzy variable. Based on Bellman's Principle of Optimality, a recurrence equation for the problem is presented. A linear quadratic fuzzy optimal-control problem is shown to have an exact solution by the recurrence equation if the system is affected by triangular fuzzy variables. For general cases, two methods, the hybrid intelligent algorithm and the finite-search method, are established to approximate the solutions of the problem. Finally, an example is used to show that these two methods are effective to solve a fuzzy optimal-control problem for a multistage fuzzy system. © 2011 IEEE.


Gao W.,Nanjing University of Science and Technology
Optics Letters | Year: 2010

The effect of the two-point spatial correlation function of human tissue on the spectrum of scattered light is considered within the accuracy of the first Born approximation. An expression for the maximum of the spectrum of the scattered light at various scattering angles is derived. It is shown that for most biological tissues the spectrum of the backscattered light is centered at a higher frequency with respect to the incident spectrum. © 2010 Optical Society of America.


Zhou M.,Nanjing University of Science and Technology | Robinson C.V.,University of Oxford
Current Opinion in Structural Biology | Year: 2014

Membrane proteins are flexible molecular machines, responsible for the exchange of molecules in and out of the cell, which have evolved to perform specific and complex tasks with great efficiency. Obtaining accurate descriptions of their dynamics in the context of their function represents a major challenge for structural biology. Here we chart recent developments in mass spectrometry designed to characterize changes in the dynamics of membrane proteins in response to ligand binding or post-translational modifications. We focus on cooperative movements and structural changes across a range of timescales, from milliseconds to minutes, and highlight the contributions of mass spectrometry to our understanding of molecular mechanisms of diverse transmembrane processes. © 2014 The Authors.


Huang H.,Nanjing University of Science and Technology | Wang X.,Nanjing University of Science and Technology
Journal of Materials Chemistry | Year: 2012

Well-dispersed Pd nanoparticles supported on low-defect graphene (LDG) sheets are successfully prepared by a soft chemical method. Our approach can efficiently avoid damaging the graphene framework in the composite because it does not require cumbersome oxidation of graphite in advance and needs no subsequent reduction of the LDG sheets due to the lower oxidation degree. Morphology observations show that the Pd nanoparticles with diameters ranging from 1 to 5 nm are evenly deposited on graphene sheets. Raman spectroscopic analysis results reveals that there is only a very small amount of graphene defects in the hybrid. No matter whether it is for a direct formic acid fuel cell (DFAFC) or direct methanol fuel cell (DMFC), the LDG-supported Pd catalyst has very large electrochemically active surface area (ECSA) values, more than twice as large as that for the reduced graphene oxide, or five times the commercial XC-72 carbon. The forward peak current measurements show similar results. The excellent catalytic performance of LDG/Pd can be attributed to the preserved pristine graphene structure, which not only provides a lot of surface area for the deposition of nanoparticles, but also allows for electrical conductivity and stability in the composite. © 2012 The Royal Society of Chemistry.


Zhu Y.,Nanjing University of Science and Technology | Wei Y.,Nanjing University of Science and Technology
Chemical Science | Year: 2014

A novel Cu-catalyzed direct alkenylation of simple alkanes with styrenes was described. In the presence of a catalytic amount of Cu(OTf)2, a diverse range of alkenes undergo coupling with cycloalkanes to produce (E)-alkyl alkenes. This transformation is proposed to proceed via a radical process. This journal is © the Partner Organisations 2014.


Chen G.,Nanjing University of Science and Technology
Nature Materials | Year: 2016

TiAl alloys are lightweight, show decent corrosion resistance and have good mechanical properties at elevated temperatures, making them appealing for high-temperature applications. However, polysynthetic twinned TiAl single crystals fabricated by crystal-seeding methods face substantial challenges, and their service temperatures cannot be raised further. Here we report that Ti–45Al–8Nb single crystals with controlled lamellar orientations can be fabricated by directional solidification without the use of complex seeding methods. Samples with 0° lamellar orientation exhibit an average room temperature tensile ductility of 6.9% and a yield strength of 708 MPa, with a failure strength of 978 MPa due to the formation of extensive nanotwins during plastic deformation. At 900 °C yield strength remains high at 637 MPa, with 8.1% ductility and superior creep resistance. Thus, this TiAl single-crystal alloy could provide expanded opportunities for higher-temperature applications, such as in aeronautics and aerospace. © 2016 Nature Publishing Group


Ge W.,Nanjing University of Science and Technology | Wei Y.,Nanjing University of Science and Technology
Green Chemistry | Year: 2012

The iodine catalyzed oxidative system for 3-sulfenylation of indoles with disulfides using DMSO as oxidant has been achieved under ambient conditions, providing a convenient and efficient method for the synthesis of 3-sulfenylindoles in good to excellent yields and with high selectivity. The reaction was carried out in a green solvent, DMC, under atmospheric conditions. Only 0.5 mmol of disulfide was needed for the 3-sulfenylation of 1 mmol of indole because both the sulfenyl groups of a symmetric disulfide take part in the reaction. The procedure is suitable for N-protected or unprotected indoles. © The Royal Society of Chemistry 2012.


Han Y.,Nanjing University of Science and Technology
IEEE Transactions on Signal Processing | Year: 2012

A particle filter approach is proposed for adaptive narrowband beamforming in the presence of strong interference and uncertain steering vector of interest signal. From the viewpoint of subspace decomposition, we first describe the known subspace projection beamformer as an orthogonal component of the steering vector that is perpendicular to the interference space. Then a Rao-Blackwellized particle filter algorithm is designed to estimate the subspace projection beamforming weights. All steps including the important sampling, weight updating, resampling and analytical computation have been discussed in detail. Finally, the overall adaptive beamforming algorithm is summarized and the computational complexity analysis is presented. The main contribution of this paper is to apply and formulate Rao-Blackwellized particle filtering to estimate the distribution over the subspace projection beamforming weights. Different from other two particle-filter-based beamformers proposed by Li and Chandrasekar, it is a STI-based method with unknown source steering vector. The sampled state variables are the signal power, noise power and a model parameter for beamformer weights transition; the marginalized analytical state variables are the subspace projection beamforming weights; and the measurements are a series of constructed signal samples by using the estimated projection operator and random noise loading. Numerical simulations show that the proposed beamformer outperforms linearly constrained minimum variance, subspace projection, Bayesian and other two particle-filter-based beamformers. After convergence, it has similar performance to the optimal max-SINR beamformer which uses the true steering vector and ideal interference-plus-noise covariance matrix. © 2012 IEEE.


Patent
Nanjing University of Science, Technology and Zhou | Date: 2013-03-06

A bidirectional pressure self-balancing stop valve includes a valve body (1), a valve disc(4), a press ring(16), a valve bonnet(17), a valve rod(19) and a balance hole(21).The valve disc (4) is located inside a chamber of the valve body(1), the press ring (16) is disposed on the upper side of the chamber of the valve body(1). The excircle of the valve disc(4), the press ring(16) and the valve body(1) form an annular groove, inside which is disposed with a composite seal ring that is high temperature resistant or corrosion resistant. The composite seal ring includes an upper washer(14), an upper seal ring(13), an upper distance ring(12), a blocking ring(11), a lower distance ring(10), a lower seal ring(8) and a lower washer(7) from top to bottom. A lower end surface (22) of the upper washer (14) and an upper end surface (25) of the upper distance ring (12) are in the shapes of a conical surface, an inclined plane or a spherical surface, formed by squeezing the upper seal ring (13) towards the internal direction of the valve disc. A lower end surface (26) of the upper distance ring (12) and an upper end surface (28) of the lower distance ring (10) are in the shapes of a cylindrical surface, a conical surface, an inclined plane or a spherical surface, formed by squeezing the blocking ring (11) towards the external direction of the valve body; and a lower end surface (29) of the lower distance ring (10) and an upper end surface (32) of the lower washer (7) are in the shapes of a conical surface, an inclined plane or a spherical surface, formed by squeezing the lower seal ring (8) towards the internal direction of the valve disc. The stop valve have pressure self sealing characteristic and long reliable sealing quality.

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