Tianjin, China

Tianjin University of Commerce is a university in Tianjin, China under the municipal government. Tianjin University of Commerce was established in 1980. After two decades of construction and development, it has become an advanced university with undergraduate and postgraduate programs specialising in economics, stration, engineering, law, liberal arts and science.The University is located by the Ziya River in Tianjin and covers an area of 600,000 m2 including 500,000 m2 of teaching and dormitory space. The campus is clean and tidy with first-rate facilities providing excellent conditions for working, studying and researching. Wikipedia.

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Cao X.,Tianjin Medical University | Han Z.-B.,Peking Union Medical College | Zhao H.,Tianjin University of Commerce | Liu Q.,Peking Union Medical College
International Journal of Biochemistry and Cell Biology | Year: 2014

Alleviation of hyperglycemia in chemical-induced diabetic mice has been reported after bone marrow transplantation. Nevertheless, the underlying mechanism remains elusive. In the present study, we transplanted genetically labeled primary mouse mesenchymal stem cells into the pancreas of the streptozotocin-treated hyperglycemic isogeneic mice, resulting in a decrease in blood glucose due to a recovery in beta cell mass. Further analysis revealed that the increase in beta cell mass was predominantly attributable to beta cell replication. The grafted mesenchymal stem cells did not transdifferentiate into beta cells themselves but recruited and polarized macrophages in a Stromal cell-derived factor 1-dependent manner, which in turn promoted beta cell replication. Our finding thus suggests that transplantation of autogenic mesenchymal stem cells may increase functional beta cell mass by boosting beta cell replication in diabetes. © 2014 Elsevier Ltd.

Chen H.,Tianjin University of Commerce | Lee W.L.,Hong Kong Polytechnic University
Energy and Buildings | Year: 2013

LEED and BEAM Plus have been formally launched for more than 10 years. They are the two most recognized building environmental assessment schemes in China. Previous works have been done on benchmarking the energy assessment of the two schemes. However, benchmarking was either based on their earlier versions of which substantial changes have been made, or focused on their assessment issues and metrics without making reference to actual building characteristics. This paper compares the energy performance assessment results of three new office buildings in China (one in Beijing and two in Shanghai) using current versions of LEED and BEAM Plus. The three office buildings were chosen for their similarities in design. The study revealed that despite the variations in different aspects between LEED and BEAM Plus, assessment results of the three studied buildings were comparable. Amongst various building end uses, energy use for air-conditioning was found dominating the assessment results. Comparison results also show that although different tariff systems are adopted in Beijing and Shanghai, the difference will not affect the assessment results as long as same tariff system is used for predicting the energy cost of the baseline and design cases. © 2013 Elsevier B.V. All rights reserved.

Song C.-Y.,Tianjin University of Commerce
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2013

Under different conditions, sodium chloride crystals were colored electrolytically using an electrolysis apparatus with a pointed anode and a flat cathode. A lot of V, F, colloid C and N color centers were produced in colored crystals. Systematic spectral measurements were carried out to colored crystals. Parameters of absorption spectral bands of color centers were determined. Influence of different electrolysis conditions to color center concentration was studied. Current time curves were measured. Calculated value of activation energy of V color centers less than F color centers, and formation mechanism of color center was explained.

This paper presents performance of a novel ECCS (electricity-cooling cogeneration system) based on cascade utilization of the waste heat of marine engines. The cogeneration system consists of a steam Rankine cycle and an NH3-H2O absorption refrigeration cycle with an expander. The steam Rankine cycle recycles the energy of both jacket coolant and exhaust gas of engine, while the absorption refrigeration cycle is employed to recover energy of the expanded steam at the turbine outlet in Rankine cycle. The performance of the waste heat recovery system is evaluated in terms of electricity, cooling capacity, equivalent electricity and exergy efficiency. The simulation results show that the novel ECCS exhibited a maximum net electricity output of 4561 kW, a maximum cooling capacity of 3197 kW, and a maximum equivalent electricity of 5233 kW. In this case, the equivalent BSFC (brake specific fuel consumption) can be reduced to 159.48 g/kWh, comparing with the original 172.3 g/kWh without ECCS. The thermal efficiency of the engine increases from 48.92% to 52.81%. © 2016 SAE International.

Wu J.,Tianjin University of Commerce
International Conference on Advanced Communication Technology, ICACT | Year: 2016

In order to enhance the accuracy of AD-Hoc network localization and the autonomy of the range-free localization algorithm, the sensing distance-accumulated value, as a scale, is used to modify accumulated distance and estimate node location information by the way of curve fitting, instead of calculating the coordinate value by the way of maximum likelihood estimation. By means of the mathematical deduction and simulation analysis, this localization algorithm, based on the distance-assisted, could realize the quantitative analysis of DV-Hop algorithm, reduce the physical localization difference of the AD-Hoc network due to the multi-hop communication mechanism, modify the accumulated distance in the hop segment, improve the localization accuracy in a network of nodes that are unevenly distributed. In dense or sparse networks, this new improved algorithm could achieve a better localization data of the nodes than the traditional algorithm, and realize the nodes autonomous localization in the AD-Hoc network. © 2016 Global IT Research Institute (GiRI).

Liang X.P.,Tianjin University of Commerce
Applied Mechanics and Materials | Year: 2014

In the development process of regional economy, the adequate supply of public services can create a good environment, promote endogenous growth and improve the government's governance ability in public affairs. This paper mainly analyzes the function of public services in regional economy by taking Tianjin as an example. © (2014) Trans Tech Publications, Switzerland.

Shi Y.,Tianjin University of Commerce
Applied Biochemistry and Biotechnology | Year: 2014

Degradation of fermentable monosaccharides is one of the primary concerns for acid prehydrolysis of lignocellulosic biomass. Recently, in our research on degradation of pure monosaccharides in aqueous SO2 solution by gas chromatography (GC) analysis, we found that detected yield was not actual yield of each monosaccharide due to the existence of sugar-bisulfite adducts, and a new method was developed by ourselves which led to accurate detection of recovery yield of each monosaccharide in aqueous SO2 solution by GC analysis. By the use of this method, degradation of each monosaccharide in aqueous SO2 was investigated and results showed that sugar-bisulfite adducts have different inhibiting effect on degradation of each monosaccharide in aqueous SO2 because of their different stability. In addition, NMR testing also demonstrated possible existence of reaction between conjugated based HSO3 - and aldehyde group of sugars in acid system. © 2013 Springer Science+Business Media.

Liu L.,Tianjin University of Commerce
Energy Procedia | Year: 2011

In this study, an attempt is made to characterize and predict petroleum futures prices, using ideas gained from nonlinear dynamical theory. Data on the New York Mercantile Exchange (NYMEX) of crude oil and heating oil futures are used. The R/S analysis, the power spectrum and the largest Lyapunov exponent are in close agreement with each other, providing convincing evidence regarding the presence of chaotic behavior in the daily petroleum futures prices series. Nonlinear forecast modeling based on phase space reconstruction is applied to petroleum futures prices series. The results indicate the appropriateness of the nonlinear dynamical approach for characterizing and predicting the dynamics of petroleum futures prices. © 2011 Published by Elsevier Ltd.

Li S.,Tianjin University of Commerce
Mathematical and Computer Modelling | Year: 2011

By letting on times and off times be unrelated convex fuzzy variables, an alternating renewal process only with fuzziness is established. Using the α-pessimistic value and the α-optimistic value of fuzzy variables, the asymptotic behaviors of on time per unit time and off time per unit time are given. © 2011 Elsevier Ltd.

Huang Z.,Tianjin University of Commerce | Shi X.-H.,Tianjin University of Commerce | Jiang W.-J.,Tianjin University of Commerce
Journal of Chromatography A | Year: 2012

For the proper design of supercritical fluid extraction processes, it is essential to have a sound knowledge of the mass transfer mechanism of the extraction process and the appropriate mathematical representation. In this paper, the advances and applications of kinetic models for describing supercritical fluid extraction from various solid matrices have been presented. The theoretical models overviewed here include the hot ball diffusion, broken and intact cell, shrinking core and some relatively simple models. Mathematical representations of these models have been in detail interpreted as well as their assumptions, parameter identifications and application examples. Extraction process of the analyte solute from the solid matrix by means of supercritical fluid includes the dissolution of the analyte from the solid, the analyte diffusion in the matrix and its transport to the bulk supercritical fluid. Mechanisms involved in a mass transfer model are discussed in terms of external mass transfer resistance, internal mass transfer resistance, solute-solid interactions and axial dispersion. The correlations of the external mass transfer coefficient and axial dispersion coefficient with certain dimensionless numbers are also discussed. Among these models, the broken and intact cell model seems to be the most relevant mathematical model as it is able to provide realistic description of the plant material structure for better understanding the mass-transfer kinetics and thus it has been widely employed for modeling supercritical fluid extraction of natural matters. © 2012 Elsevier B.V.

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