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| 1 | THE SECOND EXPONENT SET OF PRIMITIVE DIGRAPHS显示文摘Let D = (V, E) be a primitive digraph. The exponent of D, denoted byγ(D), is the least integer k such that for any u, v∈ V there is a directed walk of length k from u to v. The local exponent of D at a vertex u∈ V, denoted by exp_D (u), is the least integer k such that there is a directed walk of length k from u to v for each v ε V. Let V = {1,2,….,n}. Following [1], the vertices of V are ordered so that exp_D (1) ≤exp_D (2) ≤…≤exp_D(n) =λ(D). Let E_n(i):= {exp_D (i) ∈D PD_n}, where PD_n is the set of all primitive digraphs of order n. It is known that E_n(n) = {γ(D) D∈PD_n} has been completely settled by [7]. In 1998, E_n(1) was characterized by [5]. In this paper, the authors describe E_n(2) for all n≥2. | MIAO ZHENGKE(Department of Mathematics, Nanjing University, Nanjing 210093, China.)(Department of Mathematics, Xuzhou Normal University, Xuzhou 221009, China.) ZHANG KEMIN(Department of Mathematics, Nanjing University, Nanjing 210093, China.) | 2000 | Chinese Annals of Mathematics,Series B2000，21，2： | 8 |
| 2 | Differentiation of Hepatocellular Carcinoma from Hepatic Hemangioma and Focal Nodular Hyperplasia using Computed Tomographic Spectral Imaging显示文摘Background and Aims:Hepatocellular carcinoma(HCC)is the most common primary hepatic malignancy.This study was designed to investigate the value of computed tomography(CT)spectral imaging in differentiating HCC from hepatic hemangioma(HH)and focal nodular hyperplasia(FNH).Methods:This was a retrospective study of 51 patients who underwent spectral multiple-phase CT at 40–140 keV during the arterial phase(AP)and portal venous phase(PP).Slopes of the spectral curves,iodine density,water density derived from iodine-and water-based material decomposition images,iodine uptake ratio(IUR),normalized iodine concentration,and the ratio of iodine concentration in liver lesions between AP and PP were measured or calculated.Results:As energy level decreased,the CT values of HCC(n=31),HH(n=17),and FNH(n=7)increased in both AP and PP.There were significant differences in IUR in the AP,IUR in the PP,normalized iodine concentration in the AP,slope in the AP,and slope in the PP among HCC,HH,and FNH.The CT values in AP,IUR in the AP and PP,normalized iodine concentration in the AP,slope in the AP and PP had high sensitivity and specificity in differentiating HH and HCC from FNH.Quantitative CT spectral data had higher sensitivity and specificity than conventional qualitative CT image analysis during the combined phases.Conclusions:Mean CT values at low energy(40–90 keV)and quantitative analysis of CT spectral data(IUR in the AP)could be helpful in the differentiation of HCC,HH,and FNH. | Weixia Li Ruokun Li Xiangtian Zhao Xiaozhu Lin Yixing Yu Jing Zhang Kemin Chen Weimin Chai Fuhua Yan | 2021 | Journal of Clinical and Translational Hepatology2021，9，3： | 6 |
| 3 | Experimental characterization and modeling of stress-dependent hysteresis of a giant magnetostrictive actuator显示文摘The hysteresis nonlinearity of giant magnetostrictive actuator(GMA) is stress-dependent.In this paper,laboratory experiments were performed to characterize the stress-dependent hysteresis properties of a GMA under different compressive stresses ranging from ?11.3 MPa to ?24.3 MPa and harmonic current excitation with amplitudes from 0.6 A to 1.2 A.The experimental results showed that remarkable changes in peak-peak displacement responses,hysteresis loop width and hysteresis loss occurred with the increasing of compressive stress;no significant changes in coercive current were observed.Based on the analysis of experimental data and discussion of the influences of the weights of Modified Prandtl-Ishlinskii(MPI) on the characteristics of hysteresis loops,a stress-dependent Prandtl-Ishlinskii(SDPI) model was proposed by extending the MPI model to describe the effects of compressive stress,in which the weights of deadzone operators are extended as function of compressive stress.Good agreements were obtained between the model simulation results and the experimental data.Additional model validations were given by the performances of tracking control experiments with an inverse feedforward controller.The experimental results have clearly shown that the inverse SDPI is effective for compensating stress-dependent hysteresis including major and minor loops. | ZHANG Zhen MAO JianQin ZHOU KeMin | 2013 | Chinese Science Bulletin2013，58，7： | 5 |
| 4 | Microstructure and property modifications in surface layers of a Mg-4Sm-2Al-0.5Mn alloy induced by pulsed electron beam treatments显示文摘In this work,surface modification of a Mg-4Sm-2Al-0.5Mn alloy with high current pulse electron beam(HCPEB)under different number of pulses were investigated.The evolution in microstructure,composition and phase components and properties in the surface layer before and after HCPEB treatment were characterized.It was found that the Al 11 Sm 3 and Al 2 Sm phases in the surface layer were gradually dissolved during HCPEB treatment,leading to the formation of a chemical homogeneous melted layers.Besides,deformation bands were formed in the treated layer due to the thermal stress generated during treatment.After 15 pulses treatment,the surface hardness increases to the maximum value of about 62.2 HV,about 61.2%higher than that of the untreated state.Electrochemical results show that the 15 pulses treated sample presents the best corrosion resistance in the 3.5wt%NaCl water solution by showing the highest corrosion potential(E_(corr))of-1.339V SEC and the lowest corrosion current density(I_(corr))of 1.48×10^(-6)A·cm^(-2).The results prove that the surface properties of the Mg-4Sm-2Al-0.5Mn alloy can be significantly improved by the HCPEB treatments under proper conditions. | Yingrui Liu Kemin Zhang Jianxin Zou Ping Yan Xu Zhang Luxia Song | 2021 | Journal of Magnesium and Alloys2021，9，1： | 4 |
| 5 | EQUITABLE COLORINGS OF LINE GRAPHS AND COMPLETE r-PARTITE GRAPHS显示文摘It is shown in this paper that Meyer’s conjecture on the equitable coloring holds for line graphs and complete r-partite graphs. | WANG Weifan (Department of Mathematics, Liaoning University, Shenyang 110036,China) ZHANG Kemin (Department of Mathematics, Nanjing University, Nanjing 210093, China) | 2000 | Systems Science and Mathematical Sciences2000，13，2： | 3 |
| 6 | COUPLED THERMO-MECHANICAL FEM ANALYSIS OF TWIST COMPRESSION DEFORMATION PROCESS显示文摘COUPLEDTHERMOMECHANICALFEMANALYSISOFTWISTCOMPRESSIONDEFORMATIONPROCESS①XueKemin,ZhangZhengrong,XiaYongjiang,LuYanMetalFormin... | Xue Kemin, Zhang Zhengrong, Xia Yongjiang, Lu Yan Metal Forming Division, #435, Harbin Institute of Technology, Harbin 150001 | 1997 | 中国有色金属学会会刊:英文版1997，7，4： | 3 |
| 7 | Protective effects and potential underlying mechanisms of sodium copper chlorophyllin against ethanol-induced gastric ulcer in mice显示文摘In study,we aimed to determine the mechanisms underlying the gastroprotective effects of sodium copper chlorophyllin(SCC)against ethanol-induced gastric ulcer injury in mice.First,the gastroprotective effects of SCC against gastric ulcer induced by ethanol were assessed.Then,biochemical,histopathological,immunohistochemistry assays,and western blot analysis were conducted to determine the possible mechanisms of action underlying the effects of SCC.Compared to the effects of omeprazole(OME)in a confirmed mouse model of ethanol-induced gastric ulcer injury,treatment with various doses of SCC resulted in up-regulation of Bcl-2 and down-regulation of the pro-apoptotic protein Bax.Significant decreases in the levels of the malondialdehyde(MDA),myeloperoxidase(MPO),and NO in the gastric tissues were observed.Furthermore,inflammatory cytokine analysis revealed that SCC treatment inhibited the expressions of TNF-αand IL-6,greatly reduced the phosphorylation level of IκB,and repressed the nuclear translocation of NF-κB p65,which demonstrated that SCC inhibited the activation of the NF-κB pathway.The present findings suggest that the protective effects of SCC may be beneficial as a potential preventive and therapeutic agent for gastric ulcer through the NF-κB pathway.Taken together,SCC administration significantly decreased the levels of MPO,NO,and MDA in gastric tissue and exerted a powerful anti-inflammatory activity as demonstrated by reduction in the secretions of proinflammatory mediators such as IL-6 and TNF-α in the serum of mice exposed to ethanol. | Huawei Lv Yan Lin Peigang Liu Weiqing Liang Kemin Wei Jinbao Pu Hongjian Zhang | 2019 | Acta Biochimica et Biophysica Sinica2019，51，9： | 2 |
| 8 | Determining gastric cancer resectability by dynamic MDCT显示文摘 | Zilai Pan Huan Zhang Chao Yan Lianjun Du Bei Ding Qi Song Huawei Ling Baisong Huang Kemin Chen | 2010 | European Radiology2010，，3： | 2 |
| 9 | GIS-based emission inventories of urban scale: A case study of Hangzhou, China显示文摘 | Qingyu Zhang Yumei Wei Weili Tian Kemin Yang | 2008 | Atmospheric Environment2008，，20： | 2 |
| 10 | Edge-face chromatic number of plane graphs with high maximum degree 显示文摘 | Wang Weifan Zhang Kemin | 1998 | Australa J Combin1998，18，： | 1 |
| 11 | Aptamer-conjugated nanomaterials and their applications显示文摘 | Liu Yang Xiaobing Zhang Mao Ye Jianhui Jiang Ronghua Yang Ting Fu Yan Chen Kemin Wang Chen Liu Weihong Tan | 2011 | Advanced Drug Delivery Reviews2011，，14： | 1 |
| 12 | Improved pitting corrosion resistance of AISI3161 stainless steel treated by high current pulsed electron beam 显示文摘 | Zhang Kemin Zou Jianxin Dong Chuang | 2006 | Surface and Coatings Technology2006，201，34： | 1 |
| 13 | Mechanisms of nanostmcture and metastable phase formations in the surface melted layers of a HCPEB-treated D2 steel 显示文摘 | Zou Jianxin Thierry Grosdidiera Zhang Kemin | 2006 | Acta Materialia2006，54，20： | 1 |
| 14 | Complementary cycles containing a fixed arc in diregular bipartite tournaments显示文摘 | Zhang Kemin Manoussakis Y Song Zengmin | 1994 | Discrete Math1994，133，： | 1 |
| 15 | Complementary cycles containing a fixed are and a fixed vertex in bipartite tournaments显示文摘 | Zhang Kemin Wang Jianming | 1993 | Ars Combin1993，35，： | 1 |
| 16 | Sur- face modification of TC4 Ti alloy by laser cladding with TiCq-Ti powders显示文摘 | ZHANG KEMIN ZOU JIANXIN LI JUN | 2010 | Transactions of Nonferrous Metals Society of China2010，，20： | 1 |
| 17 | New upper bounds for Ramsey numbers 显示文摘 | Huang Yiru Zhang Kemin | 1998 | Europ J Combinatorics1998，19，： | 1 |
| 18 | A new upper bound formula for two color classical Ramsey numbers 显示文摘 | Huang Yiru Zhang Kemin | 1998 | JCMCC1998，28，： | 1 |
| 19 | Surfacemodification of TC4 Ti alloy by laser cladding with TiC+ Ti powders 显示文摘 | ZHANG Kemin ZOU Jianxin LI Jun | 2010 | Transactions of Nonferrous MetalsSociety of China2010，，20： | 1 |
| 20 | Edge -face chromatic number of plane graphs with high maximum degree 显示文摘 | Wang Weifan Zhang Kemin | 1998 | Australa J Combin1998，18，： | 1 |
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