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Search Results: 1 - 10 of 124223 matches for " Cheng Zhang "
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Global Attractor of Two-Dimensional Strong Damping KDV Equation and Its Dimension Estimation  [PDF]
Cheng Zhang, Guoguang Lin
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.51002

Firstly, a priori estimates are obtained for the existence and uniqueness of solutions of two dimensional KDV equations, and prove the existence of the global attractor, finally get the upper bound estimation of the Hausdorff and fractal dimension of attractors.

Sensitivity Analysis of Building Envelop Elements Impact on Energy Consumptions Using BIM  [PDF]
Cheng Zhang, Lijing Ong
Open Journal of Civil Engineering (OJCE) , 2017, DOI: 10.4236/ojce.2017.73033
Abstract: Lots of researches?have shown that the optimization of building envelope reduces building energy consumption during its lifecycle. Due to the uncertainty of the relationship between individual design parameters and building performance, the extent of impact cannot be well-understood. Therefore, it is essential to evaluate the impact extent for different design parameters and identify the one (s) that impact (s) more to the building performance and hence focus so as to improve building performance efficiently. In the present research, main design parameters that affect the building performance are selected to analyse the extent of the impact. Material quantities are extracted directly from the Building Information Modelling (BIM) model so as to calculate the embodied energy in material. Moreover, simulation of energy consumption is run for different scenarios during operation stage. Energy embodied in typical construction materials are calculated for each scenario accordingly. Finally, sensitivity analysis is applied to find the extent of impact on life cycle energy of building for the selected design parameters in terms of both embodied energy (EE) and operational energy (OE). A case study of a manufactory plant is carried out to investigate the impact of the selected design parameters.
The Analysis of the Treatment of Rhabdomyolysis by Snake Bites  [PDF]
Xianglin Cheng, Xin Zhang
Yangtze Medicine (YM) , 2018, DOI: 10.4236/ym.2018.22010
Abstract: Objective: To explore the treatment measure of rhabdomyolysis caused by snake bites, and provide guidance for further prevention and control of snake bites. Methods: To retrospectively analyze the 841 cases of serpentine bites in our hospital from January 2006 to July 2017; 127 cases of patients with rhabdomyolysis syndrome were screened out, and their clinical manifestations, laboratory results, related treatment and prognosis were analyzed. Results: 127 cases patients were rhabdomyolysis out of 841 cases, 28 cases patients developed acute renal failure; treatment measures included local wound treatment, application of tetanus antitoxin, anti-snake venom serum, anti-infection, fluid “hydration” and diuretic, alkaline urine and hybrid renal replacement therapy. 112 cases were cured, improved conditions in 9 cases, 3 cases of death, 3 cases uncured. The improvement rate of is 95.26% after treatment. Conclusion: The rhabdomyolysis had a high incidence in snake bite patients, severe cases often developed acute renal failure. Serum myopsin and related biochemical blood tests could be used to diagnose rhabdomyolysis quickly. Combined treatment methods are the main measure to increase the cured rate and decrease the death rate.
Analysis of Seasonal Characteristics of Thermal Environment Based on Urban Sub-Pixel Land Use Types  [PDF]
Jingyuan Cheng, Youshui Zhang
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.611007
Seasonal variations will cause the differences in the distribution of urban thermal environment. Therefore, it is essential for analyzing the distribution of land surface temperature (LST) in different seasons under the same land use type. In this paper, fully constrained least squares method of linear spectral mixture analysis was used to extract the information of land cover fraction. According to the differences in the degree of the urban development, the study area is divided into three regions, for estimating the differences in the distribution of urban thermal environment. Ternary triangular charts were drawn to analyze the impact of each land use type on seasonal UHI. Contribution index (CI) of each land cover was calculated to analysis of the impact of each land use type on LST. The results of this study indicate that the extreme differences in temperature extremes occur in summer, followed by spring, autumn, and winter. In the spring, high LST areas appear in industrial, bare land; high LST areas in summer occur in the CBD, light industrial, and cover crops; the high LST areas in autumn appear in the CBD, high-density residential; in winter, the distribution of low-density and medium-density residential areas, crops and lawns will inhibit the urban heat island effect. The analytical methodologies that be used in this study can help to quantify urban thermal environmental functions effect of different land use type and explore the climate adaptation potential of cities.
Carbonate rock dissolution rates in different landuses and their carbon sink effect
Cheng Zhang
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4404-4
Abstract: Research on karst processes is important for the determination of their carbon sink potential, as is research into terrestrial ecosystems in karst areas. Solutional denudation rates of soils from three karst spring watersheds supporting different land uses were studied. Solution rates showed a distinct pattern based on land use, with a generally higher rate being recorded in forest use soil. The mean values for tablet dissolution from the cultivated land, shrublands, secondary forest, grassland and primary forest were 4.02, 7.0, 40.0, 20.0, 63.5 t km 2 a 1 respectively. Changes in vegetation patterns could improve the size of karst carbon sinks; for example, in this study the carbon sink was 3 times higher in primary forest than in secondary forest soil and 9 times higher than under shrubland, equating to an increase from 5.71–7.02 to 24.86–26.17 t km 2 a 1 from cultivated land or shrub to secondary forest and to primary forest, respectively.
Cycles of the logistic map
Cheng Zhang
Physics , 2012,
Abstract: The onset and bifurcation points of the $n$-cycles of a polynomial map are located through a characteristic equation connecting cyclic polynomials formed by periodic orbit points. The minimal polynomials of the critical parameters of the logistic, H\'enon, and cubic maps are obtained for $n$ up to 13, 9, and 8, respectively.
Temperature measurement from perturbations
Cheng Zhang
Physics , 2012, DOI: 10.1103/PhysRevE.87.032146
Abstract: The notion of configuration temperature is extended to discontinuous systems by identifying the temperature as the nontrivial root of several integral equations regarding the distribution of the energy change upon configuration perturbations. The relations are generalized to pressure and a distribution mean force.
On the solution to a certain functional differential equation
Cheng Zhang
Mathematics , 2015,
Abstract: We study the roots of the function $f(x) = \sum\nolimits_{n = 0}^\infty {{x^n}{q^{n(n - 1)/2}}/n!} $, $q\in (0,1)$. Indeed, we prove that each root has the form $$x_n=- nq^{1-n}(1 + {\lambda _n}n^{-2}),n\ge1, {\lambda _n}=O(1),$$ which implies the earlier results \cite{liu1998some,langley2000certain}. In particular, $\rm{lim}_{n\to \infty}\lambda_n(q)$ is the generating function of the sum-of-divisors function $\sigma(k)$.
Research of Teaching Innovation on the Course of Water Resources Planning and Utilization  [PDF]
Baohui Men, Shanghong Zhang, Changming Ji, Cheng Zhang, Yanke Zhang
Creative Education (CE) , 2017, DOI: 10.4236/ce.2017.810115
Abstract: Objective: To innovate the teaching contents and teaching methods for the course of Water Resources Planning and Utilization which is one of the Hydrology and Water Resources Engineering professional 433 core courses of NCEPU. Methods: Literature review, modification of the course syllabus, text-books, curriculum design task and construction of the professional teachers’ team. Results: According to the basic requirements of the course construction of Water Resources Planning and Utilization, we have made some enrichment, expansion and necessary complements to the teaching contents. We have also tried to impart professional knowledge to students and to develop their practical abilities in the professional field of water resources. Gradually our under-graduate students are able to independently complete the summary of an academic paper, which includes their research methods, result analysis and conclusion drawing by writing their course papers. Conclusion: The innovation of the course of Water Resources Planning and Utilization is very successful by updating the content and changing the teaching method.
A QoE Assessment System in Distance Education  [PDF]
Dengyin Zhang, Yangyang Xu, Chunling Cheng
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.31011
Abstract: It is a challenging task to improve the real-time property and objectivity of the effect assessment for the distance education. This paper presents a QoE (Quality of Experience) assessment system based on the attention of online user. The system captures the video frames from two cameras periodically and synchronously, using the adaptive image binarization based on the linear average threshold for the pretreatment, then processing with edge detection and filtering in the cross-directions at the same time. System gets the position of computer screen and user eyeball. Analyzing the detection results comprehensively obtains the attention of online user by some judging conditions, and finally acquires the quality of user experience. Experimental results demonstrate the feasibility and efficiency.
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