Tianjin University of Science and Technology
Tianjin University of Science & Technology is a university in Tianjin, China under the municipal government. The original campus is in Hexi district. It is the first university to open a full-time campus in the Tianjin Economic-Technological Development Area and has the intention of moving the whole university to that campus. The university was formerly known as Tianjin Institute of Light Industry. Wikipedia.
Tianjin University of Science, Technology, Tianjin Hongmin Institute Of Mini Cold Storage Room, Tianjin Gasin DH Preservation Technologies Co. and Tianjin Lvxin Lower Temperature Technology & Science Co. | Date: 2012-06-12
An inflatable wall material, including: a thermal insulation layer, a first metal layer, a barrier layer, a buffer layer, a protective layer, and a second metal layer. The first metal layer, the barrier layer, the buffer layer, the protective layer, and the second metal layer are arranged on two sides of the thermal insulation layer in sequence from the inside to the outside. The two barrier layers on the two sides of the thermal insulation layer employ air-tight materials. The two barrier layers and the first metal layers on the two sides of the thermal insulation layer constitute an inflatable air-tight space. The thermal insulation layer is positioned in the air-tight space.
Wang S.,Tianjin University of Science and Technology |
Copeland L.,University of Sydney
Food and Function | Year: 2013
Starch is the most important glycemic carbohydrate in foods. The relationship between the rate and extent of starch digestion to produce glucose for absorption into the bloodstream and risk factors for diet-related diseases is of considerable nutritional interest. Native starch is attacked slowly by enzymes, but after hydrothermal processing its susceptibility to enzymatic breakdown is greatly increased. Most starch consumed by humans has undergone some form of processing or cooking, which causes native starch granules to gelatinize, followed by retrogradation on cooling. The extent of gelatinization and retrogradation are major determinants of the susceptibility of starch to enzymatic digestion and its functional properties for food processing. The type and extent of changes that occur in starch as a result of gelatinization, pasting and retrogradation are determined by the type of the starch, processing and storage conditions. A mechanistic understanding of the molecular disassembly of starch granules during gelatinization is critical to explaining the effects of processing or cooking on starch digestibility. This review focuses on the molecular disassembly of starch granules during starch gelatinization over a wide range of water levels, and its consequential effect on in vitro starch digestibility and in vivo glycemic index. © 2013 The Royal Society of Chemistry.
Zhang S.,Tianjin University of Science and Technology
Ultrasonics Sonochemistry | Year: 2012
C and Cr co-doped TiO2 (C-Cr-TiO2) sonocatalyst were synthesized by doping TiO2 with glucose and CrCl3 in a sol-gel method. The samples were characterized by X-ray diffraction, transmission electron microscopy, ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy, and X-ray photoelectron emission spectroscopy (XPS). C and Cr were detected by XPS analysis. The influence of dopants on the properties and sonocatalytic activity of TiO2 was studied. The sonodegradation products of methylene blue were analyzed by UV-vis absorption spectroscopy. The presence of C-Cr-TiO2 catalysts substantially enhanced the sonocatalytic degradation of MB in aqueous suspensions. The possible sonocatalytic mechanisms were also discussed. © 2011 Elsevier B.V. All rights reserved.
Zhou X.-M.,Tianjin University of Science and Technology
Materials Science and Engineering C | Year: 2012
A series of polyester copolymers was synthesized from 1,4-succinic acid with 1,4-butanediol and poly(ethylene glycol) through a two-step process of esterification and polycondensation in this article. The composition and physical properties of copolyesters were investigated via GPC, 1HNMR, DSC and PLM. The copolymer composition was in good agreement with that expected from the feed composition of the reactants. The melting temperature (T m), crystallization temperature (T c), and crystallinity (X c) of these copolyesters decreased gradually as the content of PEG unit increased. Otherwise, experimental results also showed that the contents of PEG in copolymers had an effect on the molecular weight, distribution, thermal properties, hydrolysis degradation properties, and crystalline morphology of polyester copolymers. © 2012 Elsevier B.V.
Zhang S.,Tianjin University of Science and Technology
RSC Advances | Year: 2014
Nano-sized calcium hydroxide (Ca(OH)2) photocatalysts were synthesized by a precipitation method. The as-prepared Ca(OH)2 samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), UV-vis absorption spectroscopy and photoluminescence spectroscopy (PL). The as-obtained Ca(OH)2 samples showed excellent photocatalytic degradation activities against methylene blue (MB) aqueous solution under visible light radiation. Dependence of the activity on various experimental conditions was investigated, and the results suggested promising utilization of the Ca(OH)2 photocatalysts. In addition, the photocatalytic degradation of MB was well fitted to pseudo-first-order kinetics. Therefore, MB was photocatalytically degraded over Ca(OH)2 through indirect dye photosensitization. This journal is © the Partner Organisations 2014.
Zhang S.,Tianjin University of Science and Technology
Ceramics International | Year: 2014
ZnS microcrystals with various shapes, including polyhedron, fan-shaped sheet, hexagonal rectangle and missing angle rectangle, were successfully prepared using a simple hydrothermal method by changing the experimental conditions. The as-obtained ZnS samples were characterized by X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The photocatalytic activities of the ZnS microcrystals with different morphologies were investigated by degradation testing of methylene blue aqueous solution. The highest photodegradation rate of methylene blue over the polyhedron-shaped ZnS reached up to almost 100%. The photodegradation efficiencies under various conditions, including amount of catalyst, pH of aqueous solution and initial concentration of methylene blue, were studied in the presence of polyhedron-shaped ZnS. The polyhedron-shaped ZnS microcrystal can thus be utilized as a promising photocatalyst for photodegrading dyes in wastewater treatment. © 2013 Elsevier Ltd and Techna Group S.r.l.
Wang D.-J.,Tianjin University of Science and Technology |
Gao X.-L.,Tianjin University of Science and Technology
Automatica | Year: 2012
This article focuses on H ∞ performance design for fractional-order systems with time-delay, using fractional-order proportional-derivative (PD μ ) controllers. First, the stabilizing parameters region in proportional-derivative plane of PD μ controller, for a fixed derivative-order, is determined in terms of a graphical stability criterion applicable to fractional-order time-delay systems. Then, in the stabilizing region, the pairs of proportional and derivative gains of PD μ controller are calculated for a range of frequencies, which satisfy the H ∞-norm constraint of complementary sensitivity function and define the H ∞ boundary curve. Finally, by changing the derivative-order of PD μ controller, we observe the relationship between the H ∞ curve and the derivative-order. Examples are followed to illustrate the design procedure. © 2012 Elsevier Ltd. All rights reserved.
Clifford M.J.,University of Nottingham |
Wan T.,Tianjin University of Science and Technology
Polymer | Year: 2010
In this paper, the effect of two different reinforcements: clay at the nanoscale and glass fibres at the micro-scale, on the mechanical properties of PA/clay and GF/PA/clay are studied. The Halpin-Tsai model is used to predict the modulus of PA/Clay and GF/PA/Clay, both of which are influenced by two factors: reinforcement shape and volume fraction. The relationships between the modulus and reinforcement shape and volume fraction are discussed. Tensile modulus, measured in tensile tests is used to fit the Halpin-Tsai models. The results demonstrate a synergy between the reinforcements at the two different scales. © 2009 Elsevier Ltd. All rights reserved.
Lu S.,Tianjin University of Science and Technology |
Liu Y.,Tianjin University of Science and Technology
Applied Catalysis B: Environmental | Year: 2012
A series of carbon nanotube (CNT)-alumina composite monoliths with meso-macroporous structures were successfully synthesized by imbibing macroporous monolithic polystyrene foams with carbon nanotube-alumina hydrosols. These composite monoliths possessed interconnected spherical macropores that mainly ranged in 10-40μm and adjustable mesopores of several nanometers. CNTs were uniformly dispersed throughout the alumina matrix. The CNT content and the calcination temperature markedly influenced the mesoporous structure, mechanical strength and thermal conductivity of the composite monoliths, but they did not significantly influence the phase transitions of alumina. The Pt-Ni/CNT-Al 2O 3 monoliths that were calcined at 1300°C exhibited high activity and selectivity with small Pt loading of 0.75wt.% for the preferential oxidation of CO. The residual concentration of CO was purified to less than 100ppm in the temperature range of 120-180°C in CO 2 and water-containing hydrogen-rich gases at a volume space velocity of 10,400h -1. This type of composite monolith could potentially be used as a catalyst support for many different reactions. © 2011 Elsevier B.V.
Wang D.-J.,Tianjin University of Science and Technology
Journal of Process Control | Year: 2012
The stabilizing parameter sets and the guaranteed gain-margin (GM) and phase-margin (PM) regions of proportional-integral-derivative (PID) controllers for a class of processes with time-delay are discussed in the paper. The admissible range of stabilizing proportional-gain is first derived by a version of Hermite-Biehler Theorem and the evaluation of some properties of the functions involved in the closed-loop characteristic equation. Then, the stabilizing region in integral-derivative plane, for a fixed proportional-gain, is drawn and identified directly in terms of a graphical stability criterion applicable to time-delay systems. Further, in the stabilizing region, the gain-margin and phase-margin specifications are considered using the same strategy as drawing the stability boundary lines, based on the technique of gain-phase margin tester (GPMT). Illustrating examples are followed in each design step to show the effectiveness of the method. © 2012 Elsevier Ltd. All rights reserved.