Showing papers by "Xuzhou Institute of Technology published in 2013"
TL;DR: The results implied that, compared to other light treatments, 300 μmol m −2 s −1 was more suitable for the culture of young tomato plants and there was no substantial gain from a PPFD above that level.
262 citations
TL;DR: In this article, the authors investigated transition policies and their implementation in resource-based cities and provided some recommendations to improve transition performance and sustainable development for resourcebased cities, including designating 69 resource-exhausted cities, supporting cities with funds and projects, formulating transition plans and evaluating transition performance.
131 citations
TL;DR: An improved delay-dependent stability criterion is derived for neutral stochastic delay systems using the martingale theory and the model transformation method and the free-weighting-matrix method.
Abstract: This paper is concerned with the problem of stability analysis for neutral stochastic delay systems. Firstly, expectations of stochastic cross terms containing the Ito integral are investigated by the martingale theory. Based on this, an improved delay-dependent stability criterion is derived for neutral stochastic delay systems. In the derivation process, the mathematical development avoids bounding stochastic cross terms, and neither the model transformation method nor free-weighting-matrix method is used. Thus the method leads to a simple criterion and shows less conservatism. Finally, two examples are provided to demonstrate the effectiveness and reduced conservatism of the proposed conditions.
65 citations
TL;DR: In this paper, a method for choosing alternative industries for resource-based cities that are confronted with resource depletion and have to restructure their industries for future development is proposed, which integrates intra-and inter-regional comparative advantages in a two-dimensional matrix model.
42 citations
TL;DR: In this paper, the effect of nanosized graphite content on spreadability was studied by spreading test and tensile test and creep test for SnBi solder and SnBi composite solder joints were conducted in a micro-mechanical test system.
Abstract: A novel Sn–Bi composite solder reinforced by nanosized graphite was studied. Effect of nanosized graphite content on spreadability was studied by spreading test. Microstructure of Sn–Bi solder and Sn–Bi composite solder was observed by scanning electron microscope. The tensile test and creep test for Sn–Bi solder and Sn–Bi composite solder joints were conducted in a micro-mechanical test system. The results show that the addition of nanosized graphite is harmful to the spreadability of Sn–Bi solder. The microstructure of Sn–Bi composite solder is refined gradually with the content of graphite increased. The ultimate tensile strength of Sn–Bi composite solders joints is reduced with the addition of nanosized graphite and the ultimate tensile strength of Sn–Bi + 0.07 wt% solder joint is almost unchanged compared with Sn–Bi solder joint. There is a great improvement in elongation of Sn–Bi + 0.07 wt% graphite solder joint. Furthermore, Sn–Bi + 0.07 wt% composite solder has a better creep performance compared with Sn–Bi solder.
34 citations
TL;DR: It was found that under the combination of compression, shearing and tension, the copper foil represents a wonderful phenomenon and tells us that the strain-softening effect occurs when the foil thickness is rolled down to a threshold level.
Abstract: A copper foil with an extreme extensibility up to 43,684% was obtained without any intermediate annealing by means of asynchronous rolling with high tension. It was found that under the combination of compression, shearing and tension, the copper foil represents a wonderful phenomenon. As the reduction increases, the specimen hardness increases up to a peak value 138 HV0.05 when the foil thickness rolled to around 100 μm and then it decreases down to 78 HV0.05 when the foil thickness rolled to the final size 19 μm. It tells us that the strain-softening effect occurs when the foil thickness is rolled down to a threshold level. The experimental results bring us some fresh ideas different with the traditional understanding on the strain-hardening mechanism of metals, which provides an experimental basis to establish the forming mechanism of the thin foil.
27 citations
TL;DR: In this article, the epitaxial growth of ZnO nanostructures on diamond by a thermal vapor transport method was reported, and a negative differential resistance (NDR) phenomenon was presented for the heterojunctions when the p-type diamond is degenerated by heavily doping with boron.
19 citations
TL;DR: Results indicate that a combined treatment of 1-MCP and 6-BA could be a good candidate for maintaining the visual quality and enhancing the nutritional value in broccoli during storage at 15 °C.
Abstract: BACKGOUND: Broccoli deteriorates very quickly after harvest at ambient temperature due to the loss of green colour and the consequent yellowing of florets. To search for an effective method to control quality deterioration, the effect of 1-methylcyclopropene (1-MCP) combined with 6-benzylaminopurine (6-BA) treatment on visual quality, antioxidant enzymes and bioactive compounds in broccoli florets were investigated.
RESULTS: A combined treatment of 2.5 µL L−1 1-MCP and 200 mg L−1 6-BA significantly reduced the increase of lightness (L*) value, and retained a high level for the hue value (H) and chlorophyll content. Superoxide dismutase, ascobate peroxidase and catalase activities increased while the activity of peroxidase decreased during storage in treated samples in comparison with the controls. The combined treatment enhanced the biosynthesis of glucosinolate and the formation of the anticarcinogen sulforaphane, which improved the health benefit of broccoli.
CONCLUSION: These results indicate that a combined treatment of 1-MCP and 6-BA could be a good candidate for maintaining the visual quality and enhancing the nutritional value in broccoli during storage at 15 °C. © 2012 Society of Chemical Industry
18 citations
TL;DR: In this paper, a microcosmic view field model containing a single micro-crack with different angles (0°, 45° and 90°) was investigated using the eXtended Finite Element Method (XFEM).
15 citations
TL;DR: In this paper, the existence criteria for positive solutions of the nonlinear p-Laplacian fractional differential equation whose nonlinearity contains the first-order derivative explicitly were considered.
Abstract: In the paper, we consider the existence criteria for positive solutions of the nonlinear p-Laplacian fractional differential equation whose nonlinearity contains the first-order derivative explicitly
10 citations
TL;DR: In this article, bottom slag and sewage sludge from municipal solid waste incineration and sewage treatment plants were co-sintered for use as a cost-effective adsorbent for phosphate removal from aqueous solutions.
Abstract: Bottom slag and sewage sludge discharged from municipal solid waste incineration and sewage treatment plants were co-sintered for use as a cost-effective adsorbent for phosphate removal from aqueous solutions. The Langmuir isotherm model (which gives a better description of phosphate sorption than the Freundlich model) was adopted to describe the action of the synthesized adsorbent and also for phosphate sorption by either zeolite or ironstone. The model showed that the maximum sorption capacity of the synthesized adsorbent (27,030 mg kg–1) was 38.2 greater than for zeolite and 70.6 times greater than for ironstone. Desorption of phosphate from the synthesized adsorbent at different initial concentrations was about 4.98 %, which was several times lower than for zeolite. The phosphate removal capacity of the synthesized adsorbent remained constant for solution pH values ranging from 3 to 10, which was an improvement on the capacity of the other two adsorbents; its buffering capacity was also superior. The immobilization of phosphate on the synthesized adsorbent might be attributed mainly to complexation with Fe, Al, and Ca ions. Heavy metal ion concentrations in the leachate of the synthesized adsorbent were negligible.
TL;DR: In this article, the performance of cutting tooth directly affects the mining capacity, the driving efficiency, and the service life of the tool, and they analyzed the surface wear scar of morphology.
Abstract: The cutting pick is primarily used in footing excavation such as coal mining and roadway excavation, so the performance of cutting tooth directly affect the mining capacity, the driving efficiency, and the service life of the tool. The quality of domestic mining pick is lower than that abroad, especially the tooth body wear of the whole shearer picks accounts for half of its overall failure. Thus tooth body 40Cr was treated by various heat treatment processes in this experiment, so as to improve the hardness and wear resistance of cutting tooth, analysis the surface wear scar of morphology, research the wear mechanism, that made for reducing the consumption of cutting tooth, improving work efficiency, and easing the labor intensity of workers undergound.
TL;DR: In this article, the authors investigated the invertibility of IY+δTT+ when T is a closed operator from X to Y with a generalized inverse T+ and δT is a linear operator whose domain contains D(T) and range is contained in D(D(T+).
TL;DR: In this article, Chen et al. proposed an efficient two-factor authentication and key agreement protocol, which is secure against password guessing attack, privileged administrator attack, key control attack and lacks of forward security.
Abstract: Two-factor authentication using password and smart card could reduce the risk than the use of a password alone. Recently, Chen et al. proposed a two-factor remote user authentication protocol using password and smart card and provide the criteria of authentication protocols. They claimed their protocol is secure against certain known attacks. In this paper, the authors showed that Chen et al.'s scheme is still vulnerable to the off-line password guessing attack, privileged administrator attack, key control attack and lacks of forward security. To solve these security problems, we propose an efficient two-factor authentication and key agreement protocol..
TL;DR: In this paper, a cutting pick jiont which was welded by induction brazing was strengthened by plasma arc powder surfacing, then analyzed the microstructure, surface topography, and mechanical property of the weld Jiont, so as to provide a new scheme for solving the tooth wear failure, and extending the service life.
Abstract: Cutting tooth especially due to the poor quality of the shearer brazing, caused great pick consumption and delayed hours. The tooth body wear of the whole shearer picks accounts for half of its overall failure. In this experiment, the cutting pick jiont which was welded by induction brazing was strengthened by plasma arc powder surfacing, then analyse the microstructure, surface topography, and mechanical property of the weld jiont, so as to provide a new scheme for solving the tooth wear failure, and extending the service life. The pick failure problem caused by the lower hardness of the tooth tip, tooth wear, and the premature loss of hard alloy head.
TL;DR: A deterministic annealing algorithm is proposed for approximating a solution of the linearly constrained nonconvex quadratic minimization problem and preliminary numerical results show that the algorithm seems effective and efficient.
01 Jan 2013
TL;DR: The authors showed that Chen et al.'s scheme is still vulnerable to the off-line password guessing attack, privileged administrator attack, key control attack and lacks of forward security.
Abstract: Two-factor authentication using password and smart card could reduce the risk than the use of a password alone. Recently, Chen et al. proposed a two-factor remote user authentication protocol using password and smart card and provide the criteria of authentication protocols. They claimed their protocol is secure against certain known attacks. In this paper, the authors showed that Chen et al.'s scheme is still vulnerable to the off-line password guessing attack, privileged administrator attack, key control attack and lacks of forward security. To solve these security problems, we propose an efficient two-factor authentication and key agreement protocol..
TL;DR: In this paper, the authors characterized the boundedness and compactness of the following Riemann-Stieltjes operator, where L_g(f)g(z) = √ √ 0.1cm.
Abstract: In this paper, the authors characterize the boundedness and compactness of the following Riemann-Stieltjes operator \vspace{-0.1cm} $$ L_g(f)(z)=\int_0^1{\cal R}f(tz)g(tz)\,\frac{dt}{t}, z\in B, $$ where ${\cal R}f(z)$ is the radial derivative of function $f$ at $z$, from mixed norm spaces $H(p,\, q,\, \phi)$ to Zygmund-type spaces on the unit ball.
TL;DR: A novel class of explicit solutions, such as soliton, rational-like, Matveev, Complexiton and interaction solutions, are obtained by letting the general matrix be some special cases.
TL;DR: In this article, the structure of 1-mm tungsten (W) coating on copper (Cu) with different compliant layers was designed and optimized by means of ANSYS code, and the maximum stress reduction of about 25% was obtained from the W/Cu-compliant layer; however, the surface temperature was increased only by 12°C.
Abstract: Structure of 1-mm tungsten (W) coating on copper (Cu) with the different compliant layers was designed and optimized by means of ANSYS code Three materials of titanium, nickel-chromium-aluminum alloys, and W/Cu mixtures with a thickness of 05 mm were selected as the compliant layers to evaluate their effects on the interface stress between W and Cu, strain, and the surface temperature under the heat load of 5 MW/m2 Application of the compliant layers can obviously alleviate the interface stress concentration compared to the sharp interface The maximum stress reduction of about 25% was obtained from the W/Cu-compliant layer; however, the surface temperature was increased only by 12 °C Further investigation on the W/Cu-compliant layer revealed that 01-02-mm 20-35 vol% W was the optimum structure for 1-mm W coating, which resulted in the smallest peak stress of 299 MPa and the equivalent plastic strain of 001%
TL;DR: Under the monostable assumption, the asymptotic behavior, the monotonicity and uniqueness of traveling wave are established when the wave speed is greater than or equal to the minimal wave speed c*(θ) > 0.
Abstract: In this paper, we are concerned with the wave propagation for a system of 2-D lattice differential equations with delay. Under the monostable assumption, the asymptotic behavior, the monotonicity and uniqueness of traveling wave are established when the wave speed is greater than or equal to the minimal wave speed c*(θ) > 0. In addition, the directional dependence of the minimal wave speed is analyzed numerically.
TL;DR: In this article, the back-to-back metal-seconductor-metal (M-S-M) model is used to explain the electronic transport of a ZnO nanowire film based structure.
Abstract: Employing a simple and efficient method of electro-chemical anodization, ZnO nanowire films are fabricated on Zn foil, and an ultraviolet (UV) sensor prototype is formed for investigating the electronic transport through back-to-back double junctions. The UV (365 nm) responses of surface-contacted ZnO film are provided by I—V measurement, along with the current evolution process by on/off of UV illumination. In this paper, the back-to-back metal—seconductor—metal (M—S—M) model is used to explain the electronic transport of a ZnO nanowire film based structure. A thermionic-field electron emission mechanism is employed to fit and explain the as-observed UV sensitive electronic transport properties of ZnO film with surface-modulation by oxygen and water molecular coverage.
TL;DR: In this article, the change of microstrcture and mechanical property was analyzed by quenching and tempering treatment, thus prolonging the service life of shearer picks by improving the comprehensive performance of the tooth body material.
Abstract: Cutting tooth especially due to the poor quality of the shearer brazing, caused enormous economic losses each year in our country, which caused great pick consumption and delayed hours, and then resulting in reduced efficiency. The tooth body wear of the whole shearer picks accounts for half of its overall failure. In this experiment, the heat treatment which included heating temperature, soaking time, and cooling, etc. was designed by service conditions and performance requirements of the body material 40Cr. The change of microstrcture and mechanical property was analysed by quenching and tempering treatment, thus prolong the service life of shearer picks by improving the comprehensive performance of the tooth body material.
TL;DR: In this article, the same authors used a home-made water-soluble copper brazing agent instead of the traditional dehydrated borax to improve the strength of the welded joint.
Abstract: As wearing parts, shearer picks, in which the huge consumption and inefficient are caused by the poor quality of brazing, are widely used in the mining process In this paper, the cemented carbide YG15, 42CrMo steel and HL105 copper brazing film were used as the head, body and solder, respectively, and the furnace brazing was used for shearer picks where the home-made water-soluble copper brazing agent was fabricated instead of the traditional dehydrated borax The results show that the strength of the welded joint improves greatly and is up to a superior level When the copper brazing agent and water in a four-to-six ratio, the solder is completely wetted, the best bending resistance of the head is obtained, the brazing seam of picks which are superior to the factory production is brimming, and thus the service life is significantly improved
TL;DR: Two-dimensional FTIR correlation spectroscopy supported the conclusion that the critical role of inoculation in composting was attributed to the degradation of cellulose prior to other biopolymers.
Journal Article•
TL;DR: Zhang et al. as mentioned in this paper tested the relationship between environmental pollution and economic growth of 47 prefecture-level resource-based cities from 2003 to 2009 using Environmental Kuznets Curve(EKC) model.
Abstract: Resource-based cities are a kind of special cities which have developed with the exploration of natural resources,and their resource-based industries account for a large share in the economyIn China,there are 118 resource-based cities which have made momentous contributions to the nation's development for decadesIn general,industrial production makes economic growth,as well as environmental pollutionThe higher the share of secondary sector in GDP is,the more pollution emissionThe average of share of secondary sector in GDP in resource-based cities is ten percentage points higher than that in all prefecture-level citiesThe pollution in resource-based cities is also more serious than that in these citiesWith industrial dust,industrial waste water and industrial SO2 as examples,this paper tests the relationship between environmental pollution and economic growth of 47 prefecture-level resource-based cities from 2003 to 2009 using Environmental Kuznets Curve(EKC) modelThe result shows that three pollutants are significant at 1% or 5% level of significanceHere,the EKC of dust emission shows N-shapedThe turning points are 1750 and 39287 yuan of GDP per capitaBut 1750 yuan is out of the sampleIn 2010,the GDP per capita is less than 39287 yuan in most resource-based citiesPer capita dust emission decreases with the increase of GDP per capita in most resource-based cities in the past several years,but will increase in the futureIt shows that economic growth is not decoupling with dust pollutantThe EKCs of waste water and SO2 show inverted U-shaped pattern,which is consistent with the general findings of the relation between economic growth and environmental pollutionThe turning points are 8371 and 16893 yuan respectivelyHerein,8371 yuan is at the right part of waste water EKC in more than half of these resource-based cities,while 16893 yuan is at the right part of SO2 EKC in just a quarter of themIn addition,we find that category of resources influence the shapes and turning points of EKC in resource-based citiesPollutants have various shapes of EKC in different kinds of resource-based citiesTurning points would come early in cities which polluted seriously and have low GDP per capitaCompared with the whole country,resource-based cities have earlier turning point if there are similar EKCFinally,some recommendations are offered to improve the sustainable development of resource-based cities such as taking environmental treatments,carrying out green transformation,developing circular economy and enlarging the overall control
TL;DR: In this article, a two-electrode configuration was developed for high-pressure dielectric detecting based on in situ impedance measurement in a diamond anvil cell, where the electrodes were accurately integrated on anvils with regular shape.
TL;DR: In this article, an algorithm that determines the optimal structure elements for morphology simulation was provided to achieve fidelity segmentation of small porosities in laser weldments with complex structures, and a 3D model was established to visualize the spatial distribution of porosity.
Abstract: The left and right-turning scheme of weldments was adopted to detect small porosities in laser weldments with complex structures. Detection images were obtained in this study. An algorithm that determines the optimal structure elements for morphology simulation was provided to achieve fidelity segmentation of small porosities. Mathematical models for the defect depth and deviation of bulk porosities were established based on the geometric features of laser weldments. Thus, the features of spatial distribution of small porosities were determined. To improve detection efficiency, the automatic extraction of spatial position data for bulk porosities was divided into two parts: automatic extraction of projection distance, which is important for the determination of weld porosity depth and deviation, and automatic extraction of porosity size. The porosity distribution in the longitudinal direction was obtained by automatic searching, and the features of the spatial distribution of weld porosities were procured. A 3D model of laser weldments was established to visualize the spatial distribution of porosities. Extracted data were inputted to the model, and the spatial positions of bulk porosities were visualized.
Journal Article•
TL;DR: Considering the constraint of limited communication among robots, a method of localizing odor sources using multiple robots based on particle swarm optimization is presented on the condition of abstracting each robot as a particle.
Abstract: Considering the constraint of limited communication among robots,a method of localizing odor sources using multiple robots based on particle swarm optimization is presented on the condition of abstracting each robot as a particle.Firstly,a strategy incorporating with a repulsive function is utilized to guide a robot to rapidly search for a plume.Then the range of communication among robots is estimated based on the log-distance loss model of wireless signal propagation to form a dynamic topology structure of a particle swarm and to determine the global optimum of particles.Finally,the sampling/recovery time of a sensor is incorporated to update a particle so as to trace the plume.The proposed method is applied to localize odor sources in three various scenarios and the experimental results show its effectiveness.
TL;DR: In this article, the hard chrome plating layer of hydraulic cylinder rod was tested by metallographic analysis, surface morphology observation, hardness test, corrosion resistance experiment, in order to evaluate the anticorrosion, economy and technology of the electroplating technology, and discuss the anticorerosion mechanism, so the experimental and theoretical basis will be provided in the field of production.
Abstract: The hydraulic cylinder is the essential component in the construction machinery, and the quality and safety of construction machinery products depends on its performance. As the main part of the hydraulic cylinder rod, the quality and reliability are the key indicators of the hydraulic cylinder. In this paper, the hard chrome plating layer of hydraulic cylinder rod was tested by metallographic analysis, surface morphology observation, hardness test, corrosion resistance experiment, in order to evaluate the anticorrosion, economy and technology of the electroplating technology, and discuss the anticorrosion mechanism, so the experimental and theoretical basis will be provided in the field of production. The contribution will be made by improving the corrosion resistance and wear resistance, increasing the operational reliability, extendeding service life of the hydraulic cylinder rod.