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| 1 | RESEARCH OF WAVELET TRANSFORM INSTRUMENT SYSTEM FOR SIGNAL ANALYSIS显示文摘After brief describing the Principle of wavelet transform (WT) of signals, a new signals analysis system based on wavelet transform is introduced. The design and development of the instryment of wavelet transform are described. A number of practical uses of this system demonstrate that wavelet transform system is specially functional in identifying and processing impulse, singular and non-smooth signals, so that it should be evaluated the most advanced signal analyzing system. | Qin Shuren Chen Zhikui Tang Baoping Yang Changqi Xu Mingtao He Hui (Test Center, Chongqing University) | 2000 | Chinese Journal of Mechanical Engineering2000，13，2： | 11 |
| 2 | 北运河水系河流轮虫群落结构与水环境因子的关系显示文摘目的:分析不同季节轮虫群落结构的分布特征.方法:于2015年6月(春季)、8月(夏季)和10月(秋季)分别对北京地区北运河水系16个站点进行采样调查,应用轮虫群落的香农维纳指数、均匀度指数评价北京地区水质健康状况,并应用典范对应分析法判定影响北运河水系轮虫群落结构的主要环境因子.结果:北京水体共鉴定出轮虫种类23属46种,主要以龟甲轮属和臂尾轮属为主.春季、夏季和秋季种类丰富度分别为42、38和29种,轮虫密度平均值为53.23、166.63和34.13/L.香农维纳指数平均值分别为0.65、0.43和0.53;均匀度指数平均值分别为0.17、0.12和0.21.结论:春季高锰酸钾指数是影响轮虫群落结构的主要环境因子,夏季水温是影响轮虫群落结构的主要环境因子,秋季溶解氧是影响轮虫群落结构的主要环境因子.北京地区北运河水系水体呈多污型,水生态系统呈重度污染. | 王汨 杨柏贺 孟云飞 殷旭旺 徐宗学 HAO Changqi | 2017 | 暨南大学学报(自然科学与医学版)2017，38，6： | 6 |
| 3 | Behavior and adrenal activity in a group of zoo golden snub-nosed monkeys,Rhinopithecus roxellana,following social structure change显示文摘The effects of individual removal by zoo managers on behavior and fecal glucocorticoid changes in snub-nosed monkeys(Rhinopithecus roxellana) were investigated at Beijing Zoo.The results showed that the effect of the removal of three subordinate individuals(DD,male,4 years;XZZ,male,3 years and LL,female,3 years) from a group varied across the remaining group members that may be related to individual's social status,gender and age.The dominant male was impacted less than subordinate individuals in both the frequency and time duration for the four main behavioral categories.The frequency of stereotypic behavior significantly decreased in the dominant female after the removal of three animals(Z= 2.862,P=0.003).Fluctuations were found in both the behavioral frequency and time duration in other remaining individuals.These findings suggest that small,socially stable groups were somewhat resilient to changes in member composition.Moreover,the cortisol level did not change significantly in the remaining members.An alternative method of hormone assay using fecal samples for vulnerable animals was presented,and that may be useful for monitoring wild golden monkeys and other endangered species of animal. | ZHANG XiaoLii HE Xini LIU DingZheni YAO XiuLini ZHANG YiZhuo ZHANG EnQuan ZHANG JinGuo JIANG GuoHua ZHAO ChangQi | 2013 | Chinese Science Bulletin2013，58，17： | 4 |
| 4 | Depression accelerates gastric cancer invasion and metastasis by inducing a neuroendocrine phenotype via the catecholamine/β_(2)-AR/MACC1 axis显示文摘Background:Depression is a common,easily ignored,accompanied disease of gastric cancer(GC)patients and is often observed with elevated plasma catecholamine levels.Depression frequently promotes GC progression and leads to poor clinical outcomes;however,the molecular mechanisms underlying depression-induced GC progression remain poorly understood.We aimed to study the effects of depression on GC progression and explore possible mechanisms mediating the action of depression-associated catecholamines on GC.Methods:Depression states of GC patients were graded using the Patient Health Questionnaire-9,and plasma catecholamine levels were examined by high performance liquid chromatography coupled with tandem mass spectrometry.Migrative and invasive GC cells were examined using transwell assays,and metastatic GC niches were imaged using bioluminescence technology in a depression mouse model established with chronic unpredictable mild stress.Mouse depression-like behaviors were assessed through sucrose preference,forced swimming,and tail suspension tests.Characteristics of the neuroendocrine phenotype were observed via RT-PCR,Western blotting,flow cytometry,and transmission electron microscopy.Results:Fifty-one GC patients(age:53.61±1.79 years;cancer duration:3.71±0.33 months;depression duration:2.37±0.38 months;male-to-female ratio:1.55:1)were enrolled in the study.Depression grade was significantly higher in GC patients showing higher plasma levels of catecholamines(epinephrine:P=0.018;noradrenaline:P=0.009),higher oncogene metastasis-associated in colon cancer-1(MACC1)level(P=0.018),and metastasis(P<0.001).Further,depression-associated catecholamine specifically bound to the beta-2 adrenergic receptor(β_(2)-AR)and upregulated MACC1 expression,and thus promoting neuroendocrine phenotypic transformation through direct binding betweenMACC1 and synaptophysin.Eventually,the neuroendocrine phenotypic transformation accelerated GC invasion in vitro and metastasis in vivo.However,β_(2)-AR antagonist ICI-118,551 or MACC1 silencing effectively blocked the catecholamineinduced neuroendocrine phenotypic transformation and eliminated depressionenhanced GC migration and invasion.Moreover,β_(2)-AR blocking or MACC1 silencing prevented GC metastasis attributed to a neuroendocrine phenotype in a depression mouse model.Conclusions:Catecholamine-induced neuroendocrine phenotypes of GC cells led to depression-accelerated GC invasion and metastasis via the β_(2)-AR/MACC1 axis,while β_(2)-AR antagonist or MACC1 silencing could reverse it,showing promising potential therapeutic strategies for improving the outcome of GC patients with comorbid depression. | Changqie Pan Jianhua Wu Siting Zheng Huiying Sun Yisheng Fang Zhenhua Huang Min Shi Li Liang Jianping Bin Yulin Liao Jinzhang Chen Wangjun Liao | 2021 | Cancer Communications2021，41，10： | 4 |
| 5 | Calculation and Regulation of Residual Stress Distributionfor Superhybrid Composites显示文摘The distribution of residual stresses of ARALL with different prestresses i5 calculated by finite element theory. A new method for regulating the residual stress, that is, introducing interim layer between aramid and Al layers. is given out. Applying prestress to the laminate has strong effects on the distribution of normal stress along the fiber direction. The interim layer in fiber direction presents a state with gradient distribution. | Zhong, Weihong Cui, Deyu Gu, Zhifen Chen, Changqi Li, Hongyun
| 1999 | Journal of Materials Science & Technology1999，15，2： | 3 |
| 6 | Small Angle X-ray Scattering Study of Precipitation Kinetics in Al-Zn-Mg-Cu Alloys显示文摘The evolution of microstructure parameters (precipitate size and volume fraction) for two types of Al-Zn-Mg-Cu alloys (7075 and 7055) during aging has been studied by synchrotron-radiation small angle X-ray scattering (SAXS).The results show that the precipitates are only a few nanometers for both alloys ageing even at higher temperature of 160℃ for 72 h (4.44 and 5.82 nm, respectively). The maximum of the precipitate volume fraction increases with in creasing Zn content and is about 0.023~0.028 and 0.052~0.054, respectively. The coarsening of precipitate is consistent with LSW (Lifshitz-Slyozov-Wagner) model even at the initial stage where volume fraction is still varying.The activation energy of coarsening regime has been determined to be about 1.22±0.02 eV and 1.25±0.02 eV for alloys 7075 and 7055, respectively. | Zhiwei DU Tietao ZHOU Peiying LIU Huanxi LI Baozhong DONG Changqi CHEN | 2005 | Journal of Materials Science & Technology2005，21，4： | 3 |
| 7 | Three-dimensional silk fibroin scaffolds enhance the bone formation and angiogenic differentiation of human amniotic mesenchymal stem cells:a biocompatibility analysis显示文摘Silk fibroin(SF)is a fibrous protein with unique mechanical properties,adjustable biodegradation,and the potential to drive differentiation of mesenchymal stem cells(MSCs)along the osteogenic lineage,making SF a promising scaffold material for bone tissue engineering.In this study,hAMSCs were isolated by enzyme digestion and identified by multiple-lineage differentiation.SF scaffold was fabricated by freeze-drying,and the adhesion and proliferation abilities of hAMSCs on scaffolds were determined.Osteoblast differentiation and angiogenesis of hAMSCs on scaffolds were further evaluated,and histological staining of calvarial defects was performed to examine the cocultured scaffolds.We found that hAMSCs expressed the basic surface markers of MSCs.Collagen type I(COLI)expression was observed on scaffolds cocultured with hAMSCs.The scaffolds potentiated the proliferation of hAMSCs and increased the expression of COL-I in hAMSCs.The scaffolds also enhanced the alkaline phosphatase activity and bone mineralization,and upregulated the expressions of osteogeniorelated factors in vitro.The scaffolds also enhanced the an gioge nic differe ntiati on of hAMSCs.The cocultured scaffolds in creased bone formati on in treating critical calvarial defects in mice.This study first demonstrated that the application of 3D SF scaffolds co-cultured with hAMSCs greatly enhaneed osteogenic differentiation and angiogenesis of hAMSCs in vitro and in vivo.Thus,3D SF scaffolds cocultured with hAMSCs may be a better alter native for bone tissue engin eering. | Yuwan Li Ziming Liu Yaping Tang Qinghong Fan Wei Feng Changqi Luo Guangming Dai Zhen Ge Jun Zhang Gang Zou Yi Liu Ning Hu Wei Huang | 2020 | Acta Biochimica et Biophysica Sinica2020，52，6： | 2 |
| 8 | Pool boiling heat transfer enhancement on porous surface tube显示文摘The passive residual heat removal exchanger (PRHR HX),which is a key equipment of the passive residual heat removal system,is installed in an elevated pool.Its heat transfer performance affects security and economics of the reactor,and boiling heat transfer in the liquid surrounding the exchanger occurs when the liquid saturation temperature exceeded.The smooth tubes,which are widely used as heat transfer tubes in PRHR HX,can be replaced by some enhanced tubes to improve the boiling heat transfer capability.In this paper,the pool boiling heat transfer characteristics of smooth tube and a machined porous surface tube are investigated by using high-pressure steam condensing inside tube as heating source.Compared with smooth tube,the porous surface tube considerably enhances the boiling heat transfer,and shortens the time significantly before reaching the liquid saturation temperature.Its boiling heat transfer coefficient increases from 68% to 75%,and the wall superheat decreases by 1.5oC.Combining effect of condensation inside tube with boiling outside tube,the axial wall temperatures of heat transfer tube are neither uniform nor linear distribution.Based on these investigations,enhance mechanism of the porous surface tube is analyzed. | LI Yong YAN Changqi SUN Zhongning SUN Licheng | 2011 | Nuclear Science and Techniques2011，22，2： | 2 |
| 9 | Influence of fading on characteristics of thermal analysis curve of compacted graphite iron显示文摘In general, during the production of compacted graphite iron (CGI), the active residual magnesium reduces and the effect of inoculation fades after magnesium treatment. In this paper, characteristics of the thermal analysis curve of CGI are compared with those of ductile iron and grey cast iron. The fading effect on the compacted graphite percentage and thermal analysis curve were also studied. Results indicate that the undercooling of CGI is as low as that of ductile iron, but CGI shows evident recalescence. In fading process, the magnesium element acts with oxygen. For a decrease in magnesium content, both the compacted graphite percentage and the austenitic liquidus temperature increase. The temperature of eutectic undercooling (TEU) decreases before the flake graphite appears. After that, TEU increases quickly, up to as high as 20℃, and then gradually decreases. The evolution of recalescence degree is opposite to that of TEU. | Liu Jinhai Yi Litao Li Guolu Liu Changqi Li Yinguo Yang Zhaoyu | 2011 | China Foundry2011，8，3： | 2 |
| 10 | Aragonite from Mulanshan Glaucophane Schist: Implications for Regional Evolution of Southwestern Dabie Mountains, Central China显示文摘The aragonite, an index mineral of glaucophane schist facies, has not been confirmed in the Dabie Mountains high pressure and ultrahigh pressure metamorphic belts. The Mulanshan glaucophane schist in Huangpi County, Hubei Province is located in the southwestern Dabie Mountains, Central China. The micron sized intergranular aragonite is confirmed with optical microscope (OM) and electron probe microanalysis (EPMA) in the glaucophane schist. The submicrometer sized ellipse aragonite inclusion is observed by using bright field image (BFI), X ray energy damage spectrograph (EDS) and selected area electron diffraction (SAED) with transmission electron microscope in the quartz lens of glaucophane albite epidote chlorite schist from Mulanshan. The presence of aragonite indicates not only the average geothermal gradient of the Mulanshan glaucophane schist less than 10 ℃/km, which is very close to that of eclogite in the Dabie Mountains metamorphic belts, but also the relatively higher concentration of CO2 during the metamorphic process. In addition, the glaucophane schist free of such index minerals as lawsonite, prehnite and pumpellyite, has been attributed to the effect of CO2 on the stability of calcium aluminum silicate minerals during the low grade metamorphism. EDS and SAED analysis results show that the host of aragonite inclusion is amorphous SiO2. The occurrence of amorphous SiO2 indicates a quick cooling process during the exhumation of the Mulanshan glaucophane schist. These results suggest that the rapid exhumation mechanism of the glaucophane schist, the same as that of eclogite in the Dabie Mountains metamorphic belts, occurred in the geodynamic context of subduction obduction. | Zhao Wenyu Center of Material Research and Analysis, Wuhan University of Technology, Wuhan 430070Liu Rong Wang QinyanFaculty of Earth Sciences, China University of Geosciences, Wuhan 430074 Peng Changqi Zhang QingjieCenter of Material Research and Anal | 2001 | Journal of China University of Geosciences2001，12，3： | 2 |
| 11 | An anti-HIV principle from chrysanthemum morifolium and a structure-activity correlation with some related flavonoids显示文摘 | Hu Changqi Chen Ke Sbi Qian | 1994 | J Nat Prod1994，57，1： | 1 |
| 12 | On the organization of co-operative research and development : Theory and evidence 显示文摘 | Tao Zhigang Wu Changqi | 1997 | International Journal of Industrial Organization1997，15，5： | 1 |
| 13 | A novel way to synthesize lead sulfide QDs viar-ray irradiation 显示文摘 | Xu Changqi Zhang Zhicheng Wang Hailong | 2003 | Mater Sci Eng B2003，104，12： | 1 |
| 14 | In situ growth process of Mg-Fe layered double hydroxide conversion film on MgCa alloy显示文摘In this study,an environment-friendly layered double hydroxide(LDH)film has been deposited on Mg Ca alloy by a two-step technique.To improve the chemical conversion technique and control the film properties,batch studies have been carried out to address various process parameters such as pH value,treatment temperature and immersion time.The chemical composition was determined by X-ray diffractometry and energy dispersive X-ray spectroscopy.The morphology was characterized by scanning electron microscopy.The corrosion resistance of the samples with various films was compared by polarization curves and immersion test.It is found that the transformation duration of Mg-Fe LDH is long.Too high pH value and temperature has harmful effect on the purity of the film composition.The corrosion resistance of the films formed at low value of pH or high temperature or short treatment time is deteriorative.The optimum process is as follows:the sample is first immersed in the solution containing Fe^(3+)/HCO_(3)^-/CO_(3)^(2-)with a pH value of 5 at a temperature of 55℃for 1 h to form a precursor film,and then this precursor film is immersed into the solution containing Fe^(3+)/HCO_(3)^-/CO_(3)^(2-)with a pH of 11 at 55℃for 24 h to obtain the Mg-Fe LDH conversion film. | Jun Chen Ju Feng Lei Yan Huan Li Changqi Xiong Sude Ma | 2021 | Journal of Magnesium and Alloys2021，9，3： | 1 |
| 15 | An electro-hydraulic servo control system research for CFETR blanket RH 显示文摘 | Chen Changqi Tang Hongjun Qi Songsong | 2014 | Fusion Engineering and Design2014，89，1： | 1 |
| 16 | Application of error compensation methods in high precision machining of globoid worm显示文摘 | Qing Datong Jia Chenping Yang Changqi | 2002 | Journal of Chongqing University:Nat- ural Science Edition2002，25，5： | 1 |
| 17 | The behaviour of diffusion and permeation of tritium through 316L stainless steel with coating of TiC and TiN+TiC显示文摘 | Shang Changqi Wu Aiju Li Yongjing etal | 1992 | Journal of Nuclear Materials1992，，： | 1 |
| 18 | On the Organization of Cooperative Research and Devdopment:Theoty and Evidence显示文摘 | ZhigangTao Changqi WU | 1997 | International Journal of Industrial Organization1997，，15： | 1 |
| 19 | The behavior of dif- fusion and permeation of tritium through the 316L stain- less steel coated with A1203 显示文摘 | Jiakun H Changqi S Zhujing J | 1996 | Nuclear Fusion and Plasma Physics1996，16，2： | 1 |
| 20 | EFFECTSOFLAMELLARBOUNDARIESONCREEPBEHAVIOROFPSTCRYSTALSOFTiAlALLOYS显示文摘INTRODUCTIONWithoutafundamentalunderstandingofitscrepbehavior,thereisgreatriskasociatedwiththeuseofTiAlintheenvisagedcritical... | Lin Jianguo, Zhang Yonggang and Chen Changqi Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, P. R. China | 1998 | 中国有色金属学会会刊:英文版1998，8，4： | 1 |
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