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| 1 | NUMERICAL MODELLING OF ROCK FALL USING EXTENDED DDA显示文摘The reasonable design of protective structures to mitigate the hazards from rock fall depends on the knowledge of motion behaviors of falling stones,such as the falling paths,velocities,jump heights and distances.Numerical simulation is an effective way to gain such kind of knowledge,In this paper,the discontinuous deformation analysis (DDA) is applied to rock fall analysis.In order to obtain more reliable results,the following improvements and extensions are made on the original DDA.(1)Solve the problem of block expansions due to rigid body rotation error.(2) Add the function of modeling the drag resistance from air and plants so that the velocities of falling stones obtained by simulations are good enough in agreement with those by experiments in situ.(3)Add the capability to consider energy loss due to block collisions so that the jumping heights and distances obtained by simulations are good enough in agreement with thos by experiments even for the slope with very soft layer on its surface.One of application examples is presented to show that the extended DDA is very effective and useful in rock fall analysis.Therefore,the presented method is expected to be put into wide use in slop stability analysis. | Chen Guangqi (Graduate School of Civil and Structural Engineering, Kyushu University, Fukuoka 816-8581 Japan) | 2003 | 岩石力学与工程学报2003，22，6： | 14 |
| 2 | ANALYSIS ON LAPPING AND POLISHING PRESSURE DISTRIBUTION OF HARD MAGNETIC DISK SUBSTRATE显示文摘0INTRODUCTIONInthemagneticrecordingsystem,thelowertherecordingflyingheightbetweenthemagneticheadanddisk,thehighertheareareco... | Cai, Guangqi Cai, Rui Lu, Yushan Min, Xinli | 1998 | Chinese Journal of Mechanical Engineering1998，11，4： | 8 |
| 3 | Ecosystem carbon and nitrogen storage following farmland afforestation with black locust(Robinia pseudoacacia) on the Loess Plateau, China显示文摘Although afforestation of farmlands has been proposed as an effective method of carbon(C) sequestration, there remain uncertainties that deter us from developing a clear picture of C stocks in plantation ecosystems.This study investigated the dynamics of stand structure and plant diversity, and C and nitrogen(N) pools in trees,herbs, litter, and soil(0–100 cm depth) in black locust plantations aged 9, 17, 30, and 37 years, and in newly abandoned farmlands as pre-afforestation sites, on the Loess Plateau, China. Stand density decreased significantly, while tree diameter at breast height and height increased during stand development. The dominant species of the herb layer differed with age. Afforestation resulted in slight increases in tree C and N storage in plantations from 9 to 30 years of age, and then significantly increased from 30 to 37 years. Compared to pre-afforestation, C and N storage in soil decreased to minimum values in stands aged 17 and 9 years, respectively. The soil re-accumulated C and N during stand development, attaining equilibrium levels similar to those in pre-afforestation when stands reached about 30 years of age. Soil C and N storage in 37-year stands were 29 and 16% higher, respectively, than in pre-afforestation levels. However, C and N concentrations in the subsoil(20–40 cm) were still less than the preafforestation levels for stands of all ages(from 9 to 37 years). The relative contribution to the total ecosystem C and N pools increased in trees and decreased in soil during the observed period. Our results indicate that afforestation reduced soil C and N storage during the early stages of stand development. We conclude that the growing phase of an afforested stand over its initial 30 years is important for C and N sequestration by black locust due to the C and N storage that result from recovered soil quality and an increase in tree biomass. | Guangqi Zhang Ping Zhang Yang Cao | 2018 | Journal of Forestry Research2018，29，3： | 6 |
| 4 | Service-oriented manufacturing:A literature review and future research directions显示文摘This study presents a systematic review of the literature on service-oriented manufacturing(SOM).Specifically,we focus on the impact of SOM on firm operating decisions,which distinguishes this work from previous reviews.This study proposes a classification framework for SOM research based on product flow,from its design to its final disposal.Although SOM has been studied for many years,most related research remains conceptual.Our criterion for choosing papers is that they must be relevant to practical problems.This review aims to provide readers a guide that will facilitate their search for papers in their field of interest.More importantly,we hope that this review can provide insightful managerial implications for SOM. | Zhong-Zhong JIANG Guangqi FENG Zelong YI Xiaolong GUO | 2022 | Frontiers of Engineering Management2022，9，1： | 6 |
| 5 | INVESTIGATION OF SURFACE TEMPERATURE IN HIGH-EFFICIENCY DEEP GRINDING显示文摘A new thermal model with triangular heat flux distribution is given in high-efficiency deep grinding. The mathematical expressions are driven to calculate the surface temperature. The transient behavior of the maximum temperature on contact area is investigated in different grinding conditions with a J-type thermocouple. The maximum contact temperatures measured in different conditions are found to be between 1 000 ℃ and 1 500 ℃ in burn-out conditions. The experiment results show good agreement with the new thermal model. | Zhao Henghua Cai Guangqi Jin Tan | 2005 | Chinese Journal of Mechanical Engineering2005，18，4： | 6 |
| 6 | Physical and mechanical properties of hot-press sintering ternary CM_2A_8(CaMg_2Al_(16)O_(27))and C_2M_2A_(14)(Ca_2Mg_2Al_(28)O_(46))ceramics显示文摘The new ternary CM_2A_8(CaMg_2Al_(16)O_(27))and C_2M_2A_(14)(Ca_2Mg_2Al_(28)O_(46))pure and dense ceramics were first prepared by a hot-press sintering technique,and their physical and mechanical properties were investigated.The purity of obtained CM_2A_8 and C_2M_2A_(14) ceramics reaches 98.1 wt%and 97.5 wt%,respectively.Their microstructure is dense with few observable pores,and their grain size is about a few dozen microns.For their physical properties,the average apparent porosity of CM_2A_8 and C_2M_2A_(14) ceramics is 0.18% and 0.13%,and their average bulk density is 3.66 g/cm^3 and 3.71 g/cm^3,respectively.The relative density of CM_2A_8 ceramic is 98.12%and that of C_2M_2A_(14)ceramic is 98.67%.The thermal expansivity(50–1400℃)of CM_2A_8 and C_2M_2A_(14) ceramics is 9.24×10^(–6)K^(–1) and 8.92×10^(–6)K^(–1),respectively.The thermal conductivity of CM_2A_8 and C_2M_2A_(14) ceramic is 21.32 W/(m·K)and 23.25 W/(m·K)at 25℃and 18.76 W/(m·K)and 19.42 W/(m·K)as temperature rises to 350℃,respectively.In addition,the mechanical properties are also achieved.For CM_2A_8 ceramic,the flexural strength is 248 MPa,the fracture toughness is 2.17 MPa·m^(1/2),and the Vickers hardness is 12.26 GPa.For C_2M_2A_(14) ceramic,the flexural strength is 262 MPa,the fracture toughness is 2.23 MPa·m^(1/2),and the Vickers hardness is 12.95 GPa. | Bin LI Guangqi LI Haiyang CHEN Junhong CHEN Xinmei HOU Yong LI | 2018 | Journal of Advanced Ceramics2018，7，3： | 4 |
| 7 | THE BOUNDEDNESS OF CERTAIN OPERATORS ON HOLDER AND SOBOLEV SPACES显示文摘The main topic in this note is to discuss the boundedness of pseudo-differential operators and para-product nptfators on ihe Holder and Sobotev space;, respectively It is the preparation of the thoery of Gibbs - Butzer deffereftital operators and differential equations. | Su Weiyi (Nanjing University,China)Liu Guangqi (Huabei Electronic Faculty University,China) | 1997 | Analysis in Theory and Applications1997，13，1： | 4 |
| 8 | Synthesis and pervaporation performance of high-reproducibility silicalite-1 membranes显示文摘High-reproducibility silicalite-1 membranes were synthesized on silica tubes by in-situ hydrothermal synthesis, and the relative standard deviation (R.S.D.) of average separation factor for eight membranes was only 7.5%. By using an effective method called 'solution-filling (SF)', the average flux of membranes prepared with SF method was improved by about 49% compared to membranes prepared without SF method, and the highest flux of membrane prepared with SF method towards ethanol/H2O mixture at 80℃ was 1.49 kg/(m2·h). Pervaporation experiments showed that the fluxes of silicalite-1 membranes at 60℃ were 2.63, 0.87, 0.24, and 0.20 kg/(m2·h) towards methanol/H2O, ethanol/H2O, 2-propanol/H2O, and 1-propanol/H2O mixtures, respectively, and the corresponding separation factors were 22, 69, 81, and159, respectively. | CHEN HongLiang LI YanShuo Zhu GuangQi LIU Jie YANG WeiShen | 2008 | Chinese Science Bulletin2008，53，22： | 3 |
| 9 | Liaoning Magnesia Industry Under Strict Environmental Protection Policy显示文摘Liaoning Province,uniquely endowed with magnesite resources,is the most concentrated area of magnesite reserves in China.The magnesite resources in Liaoning Province mainly distribute in Haicheng,Dashiqiao,Xiuyan,Fengcheng,Kuandian,Fushun areas with reserves of 2.5 billion tons,accounting for 85.8%of China,s reserves and 20%of the global reserves.Affected by the safe production and environmental protection management of mining enterprises and processing enterprises,in 2017,7.056 million tons of magnesite was mined in Liaoning Province,down by 58.1%year-on-year(YOY),as shown in Fig.1;11.511 million tons of magnesia refractory products were produced,down by 16.7%YOY.Due to the shutdown tide,there were no official statistics for year 2018. | HAN Guangqi ZHOU Xiaolei | 2019 | China's Refractories2019，28，3： | 3 |
| 10 | Preliminary study on modelling, fabrication by photo-chemical etching and in vivo testing of biodegradable magnesium AZ31 stents显示文摘Magnesium metal(Mg)is a promising material for stent applications due to its biocompatibility and ability to be resorbed by the body.Manufacturing of stents by laser cutting has become an industry standard.Our alternative approach uses photo-chemical etching to transfer a pattern of the stent onto a Mg sheet.In this study,we present three stages of creating and validating a stent prototype,which includes design and simulation using finite element analysis(FEA),followed by fabrication based on AZ31 alloy and,finally,in vivo testing in peripheral arteries of domestic pigs.Due to the preliminary character of this study,only six stents were implanted in two domestic farm pigs weighing 25-28 kg and they were evaluated after 28 days,with an interim follow-up on day 14.The left and right superficial femoral,the left iliac,and the right renal artery were selected for this study.The diameters of the stented artery segments were evaluated at the time of implantation,on day 14 and then,finally,on day 28,by quantitative vessel analysis(QVA)using fluoroscopic imaging.Optical Coherence Tomography(OCT)imaging displayed some malposition,breaks,stacking,and protrusion into the lumen at the proximal,distal,and mid-sections of the stented arteries.The stents degraded with time,but simultaneously became embedded in the intima.After 28 days,the animals were euthanized,and explanted vessels were fixed for micro-CT imaging and histology studies.Micro-CT imaging revealed stent morphological and volumetric changes due to the in-body degradation.An in vivo corrosion rate of 0.75 mm/year was obtained by the CT evaluation.The histology suggested no-life threatening effects,although moderate injury,inflammation,and endothelialization scores were observed. | Bala Subramanya Pavan Kumar Kandala Guangqi Zhang Capucine LCorriveau Mark Paquin Madeleine Chagnon Dana Begun Vesselin Shanov | 2021 | Bioactive Materials2021，6，6： | 2 |
| 11 | Public health preparedness and responses to the coronavirus disease 2019(COVID-19)pandemic in South Asia:a situation and policy analysis显示文摘Like rest of the world,the South Asian region is facing enormous challenges with the coronavirus disease 2019(COVID-19)pandemic.The socio-economic context of the eight South Asian countries is averse to any longterm lockdown program,but the region still observed stringent lockdown close to two months.This paper analyzed major measures in public health preparedness and responses in those countries in the pandemic.The research was based on a situation analysis to discuss appropriate plan for epidemic preparedness,strategies for prevention and control measures,and adequate response management mechanism.Based on the data from March 21 to June 26,2020,it appeared lockdown program along with other control measures were not as effective to arrest the exponential growth of fortnightly COVID-19 cases in Afghanistan,Bangladesh,India,Nepal and Pakistan.However,Bhutan,Maldives and Sri Lanka have been successfully limiting the spread of the disease.The in-depth analysis of prevention and control measures espoused densely populated context of South Asia needs community-led intervention strategy,such as case containment,in order to reverse the growing trend,and adopt the policy of mitigation instead of suppression to formulate COVID-19 action plan.On the other hand,mechanism for response management encompassed a four-tier approach of governance to weave community-led local bodies with state,national and international governance actors for enhancing the countries’emergency operation system.It is concluded resource-crunch countries in South Asia are unable to cope with the disproportionate demand of capital and skilled health care workforce at the time of the pandemic.Hence,response management needs an approach of governance maximization instead of resource maximization.The epidemiologic management of population coupled with suitable public health prevention and control measures may be a more appropriate strategy to strike a balance between economy and population health during the time of pandemic. | Amitabha Sarkar Guangqi Liu Yinzi Jin Zheng Xie Zhi-Jie Zheng | 2020 | Global Health Journal2020，4，4： | 2 |
| 12 | Luminescence enhancement of CaMoO_(4):Eu^(3+) phosphor by charge compensation using microwave sintering method显示文摘CaMoO_(4):Eu^(3+)and CaMoO_(4):Eu^(3+),A+(A=Li,Na,K)phosphors for light-emitting diode(LED)applications have been prepared by microwave sintering method(MSM),and their structure and luminescence properties are investigated.The influences of microwave reaction time and concentration of different kinds of charge compensation A+and Eu^(3+)on luminescence have also been discussed.The samples emit a red luminescence at 615 nm attributed to the^(5)D0→^(7)F2 transition of Eu^(3+)under 464 nm excitation.It is observed that adding charge compensation A+in the sample synthesis increases luminescence intensity.The optimized sample made with 32 mol%Li+and 32 mol%Eu^(3+)has an enhancement factor of 4 in photoluminescence compared to the sample made without charge compensation.The CIE(Commission Internationale de l'Eclairage)coordinates of Ca0.36MoO_(4):0.32Eu^(3+),0.32Li+are x=0.661 and y=0.339,which indicate that the obtained phosphor can be a promising red color candidate for white LED fabrications. | Zhiping ZHOU Yingsen YU Xiaotang LIU Weihao YE Guangqi HU Bingfu LEI Yun YAN | 2015 | Journal of Advanced Ceramics2015，4，4： | 2 |
| 13 | Microstructure and mechanical properties of short-carbon-fiber/Ti_(3)SiC_(2) composites显示文摘Short-carbon-fibers(C_(sf))reinforced Ti_(3)SiC_(2) matrix composites(C_(sf)/Ti_(3)SiC_(2),the C_(sf) content was 0 vol%,2 vol%,5 vol%,and 10 vol%)were fabricated by spark plasma sintering(SPS)using Ti_(3)SiC_(2) powders and C_(sf) as starting materials at 1300℃.The effects of C_(sf) addition on the phase compositions,microstructures,and mechanical properties(including hardness,flexural strength(σ_(f)),and KIC)of C_(sf)/Ti_(3)SiC_(2) composites were investigated.The C_(sf),with bi-layered transition layers,i.e.,T_(IC) and SiC layers,were homogeneously distributed in the as-prepared C_(sf)/Ti_(3)SiC_(2) composites.With the increase of C_(sf) content,the K_(IC) of C_(sf)/Ti_(3)SiC_(2) composites increased,but the σ_(f) decreased,and the Vickers hardness decreased initially and then increased steadily when the C_(sf) content was higher than 2 vol%.These changed performances(hardness,σ_(f),and K_(IC))could be attributed to the introduction of C_(sf) and the formation of stronger interfacial phases. | Guangqi HE Rongxiu GUO Meishuan LI Yang YANG Linshan WANG Yuhai QIAN Jun ZUO Jingjun XU Changsheng LIU | 2020 | Journal of Advanced Ceramics2020，9，6： | 2 |
| 14 | Disruption of crosstalk between LX-2 and liver cancer stem-like cells from MHCC97H cells by DFOG via inhibiting FOXM1显示文摘Hepatic stellate cell(HSC)line LX-2 is activated by liver cancer stem-like cells(LCSLCs)and produces various cytokines that make up most of the hepatocellular carcinoma(HCC)microenvironment.The new genistein derivative,7-difluoromethoxyl-5,4-dirboctylgenistein(DFOG),shows anticancer effects in multiple malignancies by controlling forkhead box M1(FOXM1).In this study,we aimed to assess whether DFOG disrupts the crosstalk between human HSC LX-2 cells and LCSLCs.Distinct gen erations of MHCC97H-derived spheres were obtained with the sec ond generation considered as LCSLCs which displayed enhanced self-renewal ability and elevated expression levels of CD133,CD44,and EpCAM proteins,as well as tumorigenicity,as revealed by colony formation assay in vitro and tumorigenicity assay in vivo.LX-2 and MHCC97H cells were co-cultured with/without DFOG(1,5,and 10 pM,respectively)using the transwell system.FOXM1 overexpression and/or knockdown were employed for mechanistic investigations.Our results suggested that Co-CM promoted LX-2 cell transformation into liver cancer-associated HSCs.Meanwhile,FOXM1 was up-regulated and the level of hepatocyte growth factor(HGF)was in creased in LX-2 cells and in the super nata nt after Co-CM stimulati on.Sphere and colony formation abilities in MHCC97H cells,and protein levels of CD133r CD44,and EpCAM,were also markedly elevated.DFOG dose-dependently inhibited the above effects,similar to FOXM1 knockdown in LX-2 cells.FOXM1 overexpression reversed the inhibitory effects of DFOG or FOXM1 knockdown or both on LX-2 cell activation and LCSLC feature induction in MHCC97H cells by LCSLC/LX-2 co-culture.This study demonstrated that DFOG disrupts the crosstalk between HSCs and LCSLCs to suppress LCSLC features via dowrrregulating FOXM1 expression and reducing HGF secretion in HSCs. | A Chen Chang Xu Yimin Luo Lihua Liu Kun Song Guangqi Deng Mengjie Yang Jianguo Cao Liming Yuan Xiang Li | 2019 | Acta Biochimica et Biophysica Sinica2019，51，12： | 2 |
| 15 | Data Integration Strategy for Database Grids Based on P2P Framework显示文摘The differences between the data integration of a dynamic database grid (DBG) and that of a distributed database system are analyzed, and three kinds of data integration strategies are given on the background of DBG based on Peer to Peer (P2P) framework, including the centralized data integration (CDI) strategy, the distributed data integration (DDI) strategy and the filter-based data integration (FDDI) strategy. CDI calls all the database grid services (DGSs) at a single node, DDI disperses the DGSs to multiple nodes, while FDDI schedules the data integration nodes based on filtering | WANG Guangqi SHEN Derong YU Ge ZHOU Wensheng LI Meifang | 2006 | Wuhan University Journal of Natural Sciences2006，11，5： | 1 |
| 16 | Endovascular repair of a type B aortic dissection with a ventricular septal defect occluder显示文摘 | Guangqi Chang Huishen Wang Wei Chen Chen Yao Zilun Li Shenming Wang | 2010 | Journal of Vascular Surgery2010，，6： | 1 |
| 17 | VEGF exerts an angiogenesis- independent function in cancer ceils to promote their malignant pro- gression显示文摘 | Cao Y Guangqi E Wang E | 2012 | Cancer Res2012，72，16： | 1 |
| 18 | Numerical simulationof seismic slope stability analysis based on tension-shear failuremechanism 显示文摘 | Zhang Yingbin Chen Guangqi Wu Jian | 2012 | Geotechnical Engineering2012，43，2： | 1 |
| 19 | VEGF exerts an angiogenesis in dependent function in cancer cells to promote their malignant progression显示文摘 | Cao Y Guangqi E Wang E | 2012 | Cancer Res2012，72，16： | 1 |
| 20 | Analytical thermal model of oblique moving heat source for deep grinding and cutting显示文摘 | JIN Tan CAI Guangqi | 2001 | Journal of Manufacturing Science and Engineering2001，123，： | 1 |
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