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| 1 | A STUDY ON THE EFFECT OF RADIAL INERTIA ON THE ELASTO-PLASTIC COMBINED STRESS WAVE PROPAGATION IN THIN-WALLED TUBES显示文摘An in-depth analysis of propagation characteristics of elasto-plastic combined stress waves in circular thin-walled tubes has been made. In obtaining the simple-wave solution, however,most researches have ignored the influence of the circumferential stressrelated to the radial inertial effect in the tubes. In this paper the incremental elasto-plastic constitutive relations which are convenient for dynamic numerical analysis are adopted, and the finite-difference method is used to study the evolution and propagation of elasto-plastic combined stress waves in a thin-walled tube with the radial inertial effect of the tube considered. The calculation results are compared with those obtained when the radial inertial effect is not considered. The calculation results show that the radial inertial effect of a tube has a fairly great influence on the propagation of elasto-plastic combined stress waves. | Li Yongchi Huang Chengyi Yuan Fuping Jin Yongmei | 2001 | Acta Mechanica Solida Sinica2001，14，1： | 2 |
| 2 | Viscoplastic Damage-Softening Constitutive Model for Concrete Subjected to Uniaxial Dynamic Compression显示文摘A new viscoplastic damage-softening constitutive model is presented. It is developed by integrating a Bodner-Partom viscoplastic model with a newdamage evolution equation. A set of ordinary differential equations( ODEs) is formulated,and a Runge-Kutta integral method is used to get stress-strain curves given by the model. Also,stress-strain curves of a wide range of strain-rates for concrete were obtained by split Hopkinson pressure bar( SHPB) tests. By fitting the integral stressstrain curves to the experimental ones with the least square optimization method,we determined the material parameters in our model. Some properties of the newmodel,such as strain-rate sensitivity,damage evolution characteristics,strain-rate jump effects and unloading feature,are explored.These results showthat our new model can describe dynamic behaviors of concrete very well,and our integrating-fitting-optimizing method to get material parameters is valid. | Xiaowang Sun Yongchi Li Ruiyuan Huang Zhongbao Ye Kai Zhao | 2017 | Journal of Beijing Institute of Technology2017，26，4： | 2 |
| 3 | Correction of soil parameters in calculation of embankment settlement using a BP network back-analysis model 显示文摘 | Wang Zhiliang Li Yongchi Shen R F | 2007 | Engineering Geology2007，，16： | 1 |
| 4 | Measuring the efficiency of forest man- agement显示文摘 | Kao Chiang Yang yongchi | 1991 | Forest Science1991，37，5： | 1 |
| 5 | Chronic obstructive pulmonary disease patients pharmaceutical care显示文摘 | Ren Jiang Zheng YongChi | 2011 | West China medicine2011，23，12： | 1 |
| 6 | Model study of borehole stability显示文摘 | Wang Xiaojun Guo Yong Li Yongchi | 1994 | Drilling Technology1994，6977，： | 1 |
| 7 | Correction of soil parameters in calculation of embankment settlement using a BP network back-analysis model 显示文摘 | WANG Zhiliang LI Yongchi Shen R F | 2007 | Engineering Geology2007，91，2： | 1 |
| 8 | DYNAMIC BUCKLING OF STATICALLY PRELOADED RING-STIFFENED CYLINDRICAL SHELLS UNDER AXIAL FLUID-SOLID IMPACT LOADING显示文摘The Initial Imperfection Amplified Criterion is applied to investigate the geometric nonlineardynamic buckling of statically preloaded ring-stiffened cylindrical shells under axial fluid-solid impact.Tak-ing account of the effects of large deformation and initial geometric imperfection,the governing equations areobtained by the Galerkin method and solved by the Runge-Kutta method.The effects of static preloading(uniform external radial pressure)on the buckling features and the load-carrying ability of ring-stiffened cy-lindrical shells against axial impact are discussed. | Jiang Songqing Li Yongchi Hu Xiuzhang Zheng Jijia | 2000 | Acta Mechanica Solida Sinica2000，13，3： | 1 |
| 9 | Perinatal Management and Outcomes of Pregnancy Following Sheehan Syndrome: A Case Report and Literature Review显示文摘Pregnancy is rare and difficult in Sheehan syndrome patients.With the help of assisted reproductive technology,the patients even with panhypopituitarism can get pregnant again.Moreover,women with hypopituitarism have increased risk of pregnancy complications.Here we report a patient who suffered acute and severe Sheehan syndrome with panhypopituitarism and central diabetes insipidus got pregnant again by in vitro fertilization and embryo transfer.A regular and careful antenatal care was given by the cooperation between obstetricians and endocrinologists.Finally,she delivered a healthy female baby at 37+6 weeks of gestation with Apgar scores of 10 and 10 at 1 and 5 minutes,respectively.The patient and her baby were doing well at postpartum follow-up.The related articles were also reviewed.This case report is aimed to help clinical practitioners to make better decisions on the management of Sheehan syndrome or other type of hypopituitarism during pregnancy. | Yongchi Zhan Tingting Xu Xiaodong Wang | 2021 | Maternal-Fetal Medicine2021，3，3： | 1 |
| 10 | Correction of soil parameters in calculation of embankment settlement using a BP network back-analysis model 显示文摘 | Wang Zhiliang Li Yongchi Shen R F | 2007 | Engineering Geology2007，，24： | 1 |
| 11 | Numerical simulation of tensile damage and blast crater in brittle rock due to underground explosion显示文摘 | WANG Zhiliang LI Yongchi SHEN Ruifu | 2007 | International Journal of Rock Mechanics & Mining Sciences2007，44，5： | 1 |
| 12 | A method for evaluating dynamic tensile damage of rock显示文摘 | Zhiliang Wang Yongchi Li J.G. Wang | 2008 | Engineering Fracture Mechanics2008，，10： | 1 |
| 13 | Numerical A- nalysis of the Spallation of Steel Target under Explosive Ladin显示文摘 | CHU Chaohsiang LI Yongchi WANG Xiao-jun | 1981 | Applied Mathematics and Mechnics1981，2，4： | 1 |
| 14 | Numerical analysis of blast- induced wave propagation and spalling damage in a rock plate显示文摘 | Wang Zhiliang Li Yongchi Wang J G | 2008 | In- ternational Journal of Rock Mechanics and Mining Sciences2008，45，： | 1 |
| 15 | Determination of thedamage evolution equation and spallation criterion of metals显示文摘 | LI Yongchi TAN Fuli GUO Yang | 2003 | Journal of Ningbo Univesity2003，16，4： | 1 |
| 16 | Fourier Transform Infrared Study on the Melting Phase Transition of Octadecanoic Acid显示文摘Fourier transform Infrared (FT-IR) spectroscopy was used to study the melting phase transition of anhydrous octadecanoic acid. The phase transition occurs at 69℃(Tc). In solid phase, the alkyl chains take the all-trans zigzag conformation and the C(?)-C(?)= 0 group adopts trans configuration in the dimers. In liquid state, the alkyl chains convert to gauche conformation and the C(?)C(?)= 0 to cis configuration. | Jiang Yutao, Tian Yongchi Liang Yingqiu (Institute of Theoretical Chemistry, Jilin University, Changchun) | 1991 | Chemical Research in Chinese Universities1991，7，1： | 0 |
| 17 | Excimer and Micellization of a Merocyanine显示文摘Excimers are molecular associates which exist only in excited electronic states so that they are detectable only in eemission spectra,especially in fluorescence spectra,This fluorescent phenomenon has also been observed for some stable aggregates in which molecules are arranged in a special form.Excimer fluorescence component should be affected by associate state in stable or metastable aggregates.It leads us to studying micellization by means of fluorescence spectroscopy. | Tian Yongchi and Liang Yingqiu (Institute of Theoretical Chemistry, Jilin University, Changchun)Ge Gang and Wang Shangtian (Department of Chemistry, Liaoning University, Shenyang) | 1989 | Chemical Research in Chinese Universities1989，5，3： | 0 |
| 18 | Raman Scattering Activities for Uniaxially Oriented Molecules显示文摘Raman scattering activities were derived for uniaxially oriented molecules. The unique axis of the molecules is assumed to rotate around one of the axes of space-fixed coordinate in a fixed orientation angle with respect to the axis, while the other two principal axes of the molecules are randomly oriented. Expressions for Raman scattering activities in terms of the elements of derived polarizability tensor are given as the function of orientation angle and are tabulated for various symmetries of point groups. | Wang Jingyuan, Tian Yongchi and Liang Yingqiu (Institute of Theoretical Chemistry, Jilin University, Changchun) | 1990 | Chemical Research in Chinese Universities1990，6，3： | 0 |
| 19 | The pH Effect on Resonance Raman Spectra of Brilliant Yellow in Aqueous and CTAB Micella Solutions显示文摘Recently, we have developed an application of molecular spectrometric method to the exploration of the interracial properties of black soap films, using an azobenzene dye as a probe. In order to further study the problems of surface potential and microenvfronment, an effort should be made to clarify the pH controlled behavior of the structural change of azobenzene compounds in aqueous solution and on the surface of surfactant mlcella. Here, we examine the resonance Raman spectra of brilliant yellow(BY), an azobenzene derivative, in aqueous and cetyltrimethylammonium bromide(CTAB) | Zhang Yunhong, Tian Yongchi and Liang Yingqiu (Institute of Theoretical Chemistry, Jilin University, Changchun) | 1990 | Chemical Research in Chinese Universities1990，6，3： | 0 |
| 20 | Impaired Compensatory Vasodilatory Effect Mediated by Wolfram Syndrome 1 and Corticotropin-Releasing Hormone Family Peptides in 17α-Ethynylestradiol-Induced Intrahepatic Cholestasis Pregnant Rats When Under Additional Acute Hypoxia Stress显示文摘Objective:To investigate the possible regulatory mechanism of corticotropin-releasing hormone(CRH),urocortin(UCN),and Wolfram syndrome 1(WFS1)in 17α-ethynylestradiol(EE)-induced intrahepatic cholestasis pregnant rats and its ischemia reperfusion(IR)model.Methods:Pregnant rats(n=60)were randomly divided into four experimental groups by random number table(Control,EE,IR,and EE-IR groups),and were studied on the 17^(th),19th,and 21st gestational days(GD)(n=5 in each group at the indicated time).Growth and development indicators of fetal rats among these four groups were recorded.Enzyme-linked immunosorbent assay was employed to detect CRH,UCN,and WFS1 levels in maternal sera.Western blotting and real-time polymerase chain reaction were used to quantify placental protein and placental mRNA levels of CRH,UCN,and WFS1.Multivariate analysis of variance and least significant difference test were used to establish the group and individual comparisons.Results:A significant difference was found in placenta weight(F=8.10,P<0.05),fetal rat weight(F=40.86,P<0.05),fetal rat length(F=61.61,P<0.05),and fetal rat tail length(F=55.63,P<0.05)among four groups on the 17^(th),19th,and 21st GD.What’s more,the overall differences of maternal serum UCN levels among Control,EE,IR,and EE-IR groups were significant(F=2.48,P<0.05).Expression of WFS1 mRNA in the EE-IR group was significantly increased and higher than Control(0.46±0.15vs.0.24±0.09,P<0.05),EE(0.46±0.15vs.0.17±0.04,P>0.05),and IR(0.46±0.15vs.0.22±0.15,P>0.05)groups at 19th GD,indicating that endoplasmic reticulum stress may be activated.However,the expression of CRH(0.42±0.05vs.0.58±0.12,P<0.05),UCN(0.43±0.01vs.0.47±0.16,P>0.05),and WFS1(0.57±0.07vs.0.74±0.12,P>0.05)protein in the EE-IR group was subsided compared to the IR group at 17^(th) GD.Conclusion:Fetal rat growth restriction was found in the EE-induced intrahepatic cholestasis model.This study revealed that significant changes in the maternal sera level of UCN,placental level of WFS1 mRNA and placental levels of CRH,UCN,and WFS1 protein in chronic versus acute stress in a rat model of pregnancy.This suggests an impaired compensatory vasodilatory effect mediated by these factors at gene transcription and protein translation levels,following acute hypoxia stress in EE-induced intrahepatic cholestasis in pregnant rats. | Tingting Xu Daijuan Chen Xixi Deng Yongchi Zhan Fan Zhou Xiaodong Wang | 2022 | Maternal-Fetal Medicine2022，4，1： | 0 |
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