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Search Results: 1 - 10 of 42999 matches for " GUO Zhen "
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Ratio Analysis of J Sainsbury plc Financial Performance between 2015 and 2018 in Comparison with Tesco and Morrisons  [PDF]
Lin Guo, Zhen Wang
American Journal of Industrial and Business Management (AJIBM) , 2019, DOI: 10.4236/ajibm.2019.92022
Abstract: Financial ratio analysis is an analysis of a company’s financial statements, and it is vital for identifying negative and positive trends of a business over time. This article sets out to provide a detailed analysis of the financial performance of J Sainsbury plc and compare it with the performance of Tesco and Morrisons. From the data analysis, it can be shown that from 2015, the financial performance of J Sainsbury plc is improving with an increasing trend in its sales revenue and gross margin, while there is a decreasing trend in its return on assets (ROA), operating profit, pretax profit margin, finance cost and net profit. Compared to the other two companies in the same industry like Tesco and Morrisons, the performance of J Sainsbury plc is somewhat satisfactory. Finally, some recommendations on financial aspects, business environment and strategies are offered to enhance J Sainsbury plc’s performance and promote its sustainable development.
Analysis of an influenza A (H1N1) epidemic model with vaccination
Xueyong Zhou,Zhen Guo
Arabian Journal of Mathematics , 2012, DOI: 10.1007/s40065-012-0013-6
Abstract:
Hysteretic Behavior of Steel Column Strengthened With CFRP in Thermal Environment
Zhen-Guo Li
TELKOMNIKA : Indonesian Journal of Electrical Engineering , 2012, DOI: 10.11591/telkomnika.v10i5.1278
Abstract: This paper is concerned with analysis for the strengthening effect of carbon fiber-reinforced polymer (CFRP) on steel columns under cyclic lateral loading in thermal environment. Based on the finite element theory of thermo-elastic problem and steel structure stability theory, the hysteretic behavior of axial compression steel columns was studied by using Ansys software. The main variables investigated are: cyclic lateral loading, temperature, axial compression ratio and ductility. The results show that the CFRP wraps can improve the ultimate cyclic lateral loading and ductility of steel columns prominently in thermal environment which benefit to the anti-seismic capacity of steel structure. The effect of axial compression ratio on ultimate cyclic lateral loading is very obvious, more enhancements achieved with the axial compression ratio increased. While effect of temperature on ultimate cyclic lateral loading is not very obvious below 300℃.
Non-volatile Resistive Random Access Memory based on Oxide Films
JI Zhen-Guo
无机材料学报 , 2009,
Abstract:
Uncoupled achromatic condition of a dog-leg system with the presence of RF cavities
Huiping Geng,Zhen Guo
Physics , 2013, DOI: 10.1088/1674-1137/38/6/067001
Abstract: To merge the beam from either of the two injectors to the main linac, a dog-leg system will be employed in the second Medium Energy Beam Transport (MEBT2) line of the China ADS driving accelerator. The achromatic condition has to be guaranteed to avoid beam center excursion against energy jitter. RF cavities were found indispensable to control the bunch length growth in the dog-leg system of MEBT2. The full uncoupling between transverse and longitudinal plane is desired to minimize the growth of projected rms emittances. The uncoupled achromatic condition of this dogleg system with the presence of RF bunching cavities will be deduced using the method of transfer matrixes. It is found that to fulfil the uncoupling condition, the distance between the bunching cavities is uniquely determined by the maximum energy gain of the RF cavities. The theoretical analysis is verified by the simulation code TraceWin. The space charge effect on the uncoupled achromatic condition and the beam emittance growth will also be discussed.
Classification of Hypersurfaces with Two Distinct Principal Curvatures and Closed Moebius Form in $\mathbb{S}^{m+1}$
Limiao Lin,Zhen Guo
Mathematics , 2011, DOI: 10.1007/s11425-012-4391-1
Abstract: Let $x$ be an $m$-dimensional umbilic-free hypersurface in an $(m+1)$-dimensional unit sphere $\mathbb{S}^{m+1}(m\geq3)$. One of important questions is to classify hypersurfaces with two distinct principal curvatures. In this paper, we classify and explicitly express the hypersurfaces with two distinct principal curvatures and closed Moebius form, and then we characterize and classify conformally flat hypersurfaces of dimension larger than 3.
Effects of Carpio Decoction on the Structure of Kidney in Rats with Adriamycin-Induced Nephrosis  [PDF]
Huaying Ning, Hui Wu, Xiaojian Tian, Yunliang Guo, Wei Shen, Xin Wang, Zhou Zhen
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.47A015
Abstract: The aim of this study was to observe the effects of Cyprinus carpio decoction on the expression of aquaporins in rats with adriamycin-induced nephropathy and to explore the therapeutic mechanism on nephrotic edema. Total of 50 Wistar rats were randomly divided into normal group, model group, fosinopril group, Cyprinus carpio decoction treated with high dose group and low dose group consisting of 10 rats respectively. Nephropathy models were established by injecting adriamycin through tail vein and treated with Cyprinus carpio decoction. Urinary protein excretions in 12 h, serum albumin, total serum protein, serum sodium and potassium were measured by biochemical assay. The pathological changes and the expression of AQP1, AQP2, AQP3 inrat kidneys were respectively detected by HE stain and immunohistochemiscal assay. The results indicated: 1) The urinary protein excretion in 12 h (proteinuria) increased significantly along the time longed modeling, while no significant increasing in Cyprinus carpio decoction treated group (F = 5.23 - 41.89, P < 0.05); 2) The serum albumin and total protein in model group were significantly lower than that in normal group, but that in Cyprinus carpio decoction treated group were higher than that in model group (F = 13.12 - 15.48, P < 0.05). The serum sodium and potassium in model group were higher than those in normal group, while that in Cyprinus carpio decoction treated group were higher than that in model group (F = 3.42 - 3.96, P < 0.05); 3) Renal glomerular capillaries congestive of group M rats were expansion. Glomerular mesangial cells and the basement membrane were diffuse hyperplasia, inflammatory cell infiltration. Glomerular mesangial cells and the basement membrane of Cyprinus carpio decoction with interventing groups reduced proliferation, less inflammatory cell infiltration; 4) In model group, the expressions of AQP1-3 in the renal tubule and collecting duct cells increased significantly than those in normal group, and those in Cyprinus carpio decoction treated group decreased than those in model group (F = 3.97 - 6.19, P < 0.05). It is suggested that Cyprinus carpio decoction could reduced the urinary protein excretion and alleviate pathological lesion and edema with adriamycin-induced nephropathy by decreasing the expressions of AQPs in kidneys.
Analysis of Leaf Volatiles of Crabapple (Malus sp.) Individuals in Different Aphids’ Resistance  [PDF]
Rong Wang, Xiang Shen, Chao Wang, Rui Ge, Zhen Zhang, Xiaojing Guo
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.521344
Abstract: The aim of this experiment was to analyze the leaf volatiles of crabapple (Malus sp.) individuals at different aphid’s resistance, to ascertain the particular ingredients which has lure or aversion effects on aphid, and to provide reference for finding out a simple method to control effectively aphids. Volatiles of leaves from twenty-one different crabapple individuals were evaluated with the method of head space-solid phase micro-extraction and gas chromatography-mass spectrometry (HS-SPME-GC-MS). Volatiles profiles of them were then compared. There are one hundred eighty-six kinds of volatiles were detected with varied contents found in different individuals. And all plants contain eight kinds of common components: 3-Hexen-1-ol, acetate, (Z)-, 4-Hexen-1-ol, (Z)-, n-Decanal, n-Tetradecane, .alpha.-Farnesene, Diethyl Phthalate, Oxime-, methoxy-phenyl- and Dibenzofuran-, wherein the relative content of higher have 3-Hexen-1-ol, acetate, (Z)- and 4-Hexen-1-ol, (Z)-. Specific volatile substances in high resistance plants contain 3-Hexenal, (Z)- and 2-Hexenal, (E)-. Leaf volatiles differ in twenty-one crabapple individuals. High resistance plants specific volatile substances contains 3-Hexenal, (Z)-, 2-Hexenal, (E)- and other small molecular volatile substances, and no-resistance plants all have .beta.-Farnesene.
A new algorithm of nonlinear conjugate gradient method with strong convergence
Shi, Zhen-Jun;Guo, Jinhua;
Computational & Applied Mathematics , 2008,
Abstract: the nonlinear conjugate gradient method is a very useful technique for solving large scale minimization problems and has wide applications in many fields. in this paper, we present a new algorithm of nonlinear conjugate gradient method with strong convergence for unconstrained minimization problems. the new algorithm can generate an adequate trust region radius automatically at each iteration and has global convergence and linear convergence rate under some mild conditions. numerical results show that the new algorithm is efficient in practical computation and superior to other similar methods in many situations.
Dynamical behavior of a pest management model with impulsive effect and nonlinear incidence rate
Wang, Xia;Guo, Zhen;Song, Xinyu;
Computational & Applied Mathematics , 2011, DOI: 10.1590/S1807-03022011000200008
Abstract: in this paper, we consider the pest management model with spraying microbial pesticide and releasing the infected pests, and the infected pests have the function similar to the microbial pesticide and can infect the healthy pests, further weaken or disable their prey function till death. by using the floquet theory for impulsive differential equations, we show that there exists a globally asymptotically stable pest eradication periodic solution when the impulsive period τ < τmax, we further prove that the system is uniformly permanent if the impulsive period τ > τmax. finally, by means of numerical simulation, we showthatwith the increaseof impulsive period, the system displays complicated behaviors.
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