Nanning, China

Guangxi University

www.gxu.edu.cn
Nanning, China

Guangxi University is a provincial university, located in Nanning, capital of Guangxi, China. It is also commonly abbreviated as . The university is one of the Project 211 universities in People's Republic of China. Wikipedia.


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Patent
Guangxi Junfuhuang Ground Source Heat Pump Co. and Guangxi University | Date: 2014-01-01

A heat pump system, including a main heat pump system and a directly expanded strong cool-heat radiation plate provided on the building surface and serving as the terminal of the main heat pump system. The directly expanded strong cool-heat radiation plate enables refrigerant in the main heat pump system to circulate therein. Since the heat pump system of the present application adopts the directly expanded strong cool-heat radiation plate as the terminal of the main heat pump system, refrigerant in the main heat pump system may exchange heat with air by means of the directly expanded strong cool-heat radiation plate directly, instead of secondary heat exchange of the refrigerant loop and the water circulation loop, thereby reducing loss in intermediate heat exchange, improving the heat exchange efficiency and heat utilization, and omitting the circulating pump for water circulation. An air-conditioner with the heat pump system is further disclosed.


Patent
Guangxi University and Guangxi Junfuhuang Ground Source Heat Pump Co. | Date: 2013-10-30

A heat pump system, including a main heat pump system and a directly expanded strong cool-heat radiation plate provided on the building surface and serving as the terminal of the main heat pump system. The directly expanded strong cool-heat radiation plate enables refrigerant in the main heat pump system to circulate therein. Since the heat pump system of the present application adopts the directly expanded strong cool-heat radiation plate as the terminal of the main heat pump system, refrigerant in the main heat pump system may exchange heat with air by means of the directly expanded strong cool-heat radiation plate directly, instead of secondary heat exchange of the refrigerant loop and the water circulation loop, thereby reducing loss in intermediate heat exchange, improving the heat exchange efficiency and heat utilization, and omitting the circulating pump for water circulation. An air-conditioner with the heat pump system is further disclosed.


sRNA-Xcc1 is a trans-acting sRNA recently identified from the plant pathogenic bacterium Xanthomonas campestris pathovar campestris (Xcc). Here, the phylogenetic distribution, predicted secondary structure and regulation of expression of sRNA-Xcc1 were analyzed. The analysis showed (1) a total 81 sRNA-Xcc1 homologs that are found in some bacterial strains that are taxonomically unrelated, belonging to the α-, β-, γ- and δ-proteobacteria (2) that some sRNA-Xcc1 homologs are located in a plasmid-borne transposon or near a transposase coding gene, (3) that sRNA-Xcc1 is encoded by a integron gene cassette in Xcc and sRNA-Xcc1 homologs occur in integron gene cassettes of some uncultured bacteria and (4) that sRNA-Xcc1 homologs have a highly conserved sequence motif and a stable consensus secondary structure. These findings strongly support the idea that sRNA-Xcc1 represents a novel family of sRNAs which may be originally captured by integrons from natural environments and then spread among different bacterial species via horizontal gene transfer, possibly by means of transposons and plasmids. The expression analysis results demonstrated that the transcription of sRNA-Xcc1 is under the positive control of the key virulence regulators HrpG and HrpX, indicating that sRNA-Xcc1 may be involved in the virulence regulation of Xcc.


Meng Z.,Guangxi University | Shi Z.,CAS Institute of Computing Technology
Information Sciences | Year: 2012

A systematic study of attribute reduction in inconsistent incomplete decision systems (IIDSs) has not yet been performed, and no complete methodology of attribute reduction has been developed for IIDSs to date. In an IIDS, there are various ways to handle missing values. In this paper, a missing attribute value may be replaced with any known value of a corresponding attribute (such a missing attribute value is called a "do not care" condition). In this way, this paper establishes reduction concepts specifically for IIDSs, mainly by extending related reduction concepts from other types of decision systems into IIDSs, and then derives their relationships and properties. With these derived properties, the extended reducts are divided into two distinct types: heritable reducts and nonheritable reducts, and algorithms for computing them are presented. Using the relationships derived here, the eight types of extended reducts established for IIDSs can be converted to five equivalent types. Then five discernibility function-based approaches are proposed, each for a particular kind of reduct. Each approach can find all reducts of its associated type. The theoretical analysis of the proposed approaches is described in detail. Finally, numerical experiments have shown that the proposed approaches are effective and suitable for handling both numerical and categorical attributes, but that they have different application conditions. The proposed approaches can provide a solution to the reduction problem for IIDSs. © 2012 Elsevier Inc. All rights reserved.


Cui Y.,Guangxi University
Engineering Optimization | Year: 2013

This article deals with the guillotine-constrained two-dimensional cutting problem, where a guillotine is used to cut the stock plate into rectangular pieces, such that the pattern value (the total value of the pieces produced) is maximized, observing the constraint that the frequency of each piece type should not exceed the demand. Homogeneous two-segment (HTS) cutting patterns are considered to simplify the cutting process. Each HTS pattern includes two segments, each segment contains homogeneous strips of the same direction, and each homogeneous strip contains pieces of the same type. A heuristic is presented for generating HTS patterns. It is based on dynamic programming and branch-and-bound techniques. The computational results indicate that the heuristic is able to generate solutions close to optimal, and is adequate for solving large-scale instances. © 2013 Copyright Taylor and Francis Group, LLC.


Chen W.-H.,Guangxi University | Zheng W.X.,University of Western Sydney
IEEE Transactions on Automatic Control | Year: 2010

In this technical note, the problem of delay-independent minimum dwell time for exponential stability of uncertain switched delay systems is considered. Piecewise time-varying Lyapunov functionals/functions which are decreasing at switching times by construction are introduced to investigate exponential stability of switched delay systems with constant or time-varying delays. This type of delicately constructed Lyapunov functionals/functions can efficiently eliminate the jump phenomena of adjacent Lyapunov functionals/functions at switching times without imposing any restriction on the sizes of time-delays. By applying this type of Lyapunov functionals/functions, it is shown that if each subsystem is delay-independently exponentially stable, then under some conditions there exists a delay-independent minimum dwell time in the sense that the switched delay system with such minimum dwell time is exponentially stable irrespective of the sizes of the time-delays. Two numerical examples are provided to demonstrate the efficiency of the proposed approach. © 2010 IEEE.


Cui Y.,Guangxi University
Journal of Global Optimization | Year: 2013

Three-staged patterns are often used to solve the 2D cutting stock problem of rectangular items. They can be divided into items in three stages: Vertical cuts divide the plate into segments; then horizontal cuts divide the segments into strips, and finally vertical cuts divide the strips into items. An algorithm for unconstrained three-staged patterns is presented, where a set of rectangular item types are packed into the plate so as to maximize the pattern value, and there is no constraint on the frequencies of each item type. It can be used jointly with the linear programming approach to solve the cutting stock problem. The algorithm solves three large knapsack problems to obtain the optimal pattern: One for the item layout on the widest strip, one for the strip layout on the longest segment, and the third for the segment layout on the plate. The computational results indicate that the algorithm is efficient. © 2012 Springer Science+Business Media, LLC.


Jiang L.H.,Guangxi University
European review for medical and pharmacological sciences | Year: 2012

Aim of this study was to identify whether docosahexaenoic acid (DHA) has a vital antidepressant by hypothalamic-pituitary-adrenal axis (HPA axis) or not. Mice were divided into 2 groups: control group and DHA dietary group. DHA dietary group was treated with DHA dietary everyday for consecutive 50 days. The forced swimming test and tail suspension test were conducted. Hypothalamic and erythrocyte fatty acids and monoamine neurotransmitters levels in hypothalamus were assayed; corticosterone, adrenocorticotropic hormone and corticotropin-releasing factor in serum, hypothalamus and pituitary were assayed, respectively. (1) In the forced swimming test, DHA dietary significantly decreased immobility time, whereas swimming time and climbing time were increased. In tail suspension test, DHA dietary significantly shortened immobility time. (2) DHA dietary increased the ration of n-3/n-6 (polyunsaturated fatty acids) and DHA level in hypothalamic and erythrocyte fatty acids; (3) DHA dietary significantly increased 5-hydroxytryptamine, 5-hydroxyindoleacetic acid and dopamine levels in hypothalamus; (4) DHA dietary significantly decreased serum corticosterone level by 20.23% and serum adrenocorticotropic hormone level by 25.13%; significantly increased serum corticotropin releasing factor level by 21.92%. Besides, DHA dietary decreased arginine vasopressin level by 20.11% in hypothalamus, by 23.76% in pituitary tissues, respectively; (5) DHA dietary decreased corticotropin-releasing factor levels by 30.83% in hypothalamus, by 29.75% in pituitary tissues, respectively. In hypothalamus, DHA dietary decreased significantly adrenocorticotropic hormone level by 19.14%, but insignificantly decreased adrenocorticotropic hormone level in pituitary. DHA shows an antidepressant property. Moreover, DHA has multiple effects on depression including the monoamine neurotransmitter systems, red blood cell membranes and HPA axis.


Patent
Guangxi University | Date: 2012-03-16

A device and method for removing impurities in aluminum melt. The device comprises an upper furnace body, a lower furnace body, an intermediate partition plate, a crucible, heating elements and a charging opening. The intermediate partition plate is mounted between the upper furnace body and the lower furnace body. The upper furnace body, a mixing chamber and the heating element are above the intermediate partition plate. The crucible is amounted in the lower furnace body. The heating element is provided around the lower furnace body. The lower furnace body is provided with the charging opening and a pipeline. The upper furnace body is provided with an inlet valve and an exhaust valve. The mixing chamber and the crucible are connected by a jet pipe passing through the intermediate partition plate. A ceramic seal pad is used for sealing between the mixing chamber and the jet pipe. During use, the aluminum melt and a liquid flux are placed in the crucible, the liquid flux covers the aluminum melt, the pressure of the lower furnace body is increased, the aluminum melt first stably enters the mixing chamber along the jet pipe, then the liquid flux enters the mixing chamber in a manner of confined jet flow and is uniformly mixed with the aluminum melt, last the pressure of the lower furnace body is unloaded, so that the mixed liquid falls back into the crucible, and this operation may be repeated for multiple times. For the device and the method, the impurity removal is quick, the efficiency is high and the process is closed, so there is no environmental pollution, and the aluminum melt after the impurity removal may be directly cast.


Patent
Guangxi University | Date: 2013-12-25

A device and method for removing impurities in aluminum melt. The device comprises an upper furnace body, a lower furnace body, an intermediate partition plate, a crucible, heating elements and a charging opening. The intermediate partition plate is mounted between the upper furnace body and the lower furnace body. The upper furnace body, a mixing chamber and the heating element are above the intermediate partition plate. The crucible is amounted in the lower furnace body. The heating element is provided around the lower furnace body. The lower furnace body is provided with the charging opening and a pipeline. The upper furnace body is provided with an inlet valve and an exhaust valve. The mixing chamber and the crucible are connected by a jet pipe passing through the intermediate partition plate. A ceramic seal pad is used for sealing between the mixing chamber and the jet pipe. During use, the aluminum melt and a liquid flux are placed in the crucible, the liquid flux covers the aluminum melt, the pressure of the lower furnace body is increased, the aluminum melt first stably enters the mixing chamber along the jet pipe, then the liquid flux enters the mixing chamber in a manner of confined jet flow and is uniformly mixed with the aluminum melt, last the pressure of the lower furnace body is unloaded, so that the mixed liquid falls back into the crucible, and this operation may be repeated for multiple times. For the device and the method, the impurity removal is quick, the efficiency is high and the process is closed, so there is no environmental pollution, and the aluminum melt after the impurity removal may be directly cast.

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