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| 1 | Thresholds of geographic environmental elements in sediment yield of drainage basins显示文摘Threshold of environmental elements in drainage basin sediment yield refers to, under effect of climate, underlying surface and human activity, a turning point of abrupt changes in drainage sediment yield related to environmental element characteristics. Previous studies on threshold of sediment yield of relevant drainage basins were mainly concentrated on impact of natural zones with a few researches on impact of other environmental elements. Particularly studies on compound environmental element threshold in drainage basin sediment yield remain blank today. Studies indicate that sediment yield in drainage basins is affected by compound interactions and complex actions. Based on single element analysis, the present paper gives quantitatively compound threshold of environmental elements affecting sediment yield of the drainage basin between Hekouzhen and Tongguan in the middle Yellow River by the method of multi-variant, polynomial formula regression analysis. | CHEN Hao, ZHOU Jinxing, CAI Qiangguo, LU Zhongchen & LI Zhongyan Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China Institute of Forestry Science, Chinese Academy of Forestry Science, Beijing 100091, China Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, China Computing Institute of Science and Engineering, North China Electric Power University, Beijing 102206, China | 2005 | Science China Earth Sciences2005，48，2： | 6 |
| 2 | The impact toughness of a nitride-strengthened martensitic heat resistant steel显示文摘The nitride-strengthened martensitic heat resistant steel is precipitation strengthened only by nitrides.In the present work,the effect of nitride precipitation behavior on the impact toughness of an experimental steel was investigated.Nitrides could hardly be observed when the steel was tempered at 650℃.When the tempering temperature was increased to 700℃ and 750℃,a large amount of nitrides were observed in the matrix.It was surprising to reveal that the impact energy of the half-size samples greatly increased from several Joules to nearly a hundred Joules.The ductile-brittle transition temperature(DBTT) was also discovered to decrease from room temperature to 50℃ when the tempering temperature was increased from 650℃ to 750℃.The nitride precipitation with increasing tempering temperature was revealed to be responsible for the improved impact toughness. | ZHANG WenFeng YAN Wei SHA Wei WANG Wei ZHOU QiangGuo SHAN YiYin YANG Ke | 2012 | Science China(Technological Sciences)2012，55，7： | 2 |
| 3 | High sensitivity of semimetal photodetection via Bose–Einstein condensation显示文摘The discovery of semiconductor has witnessed remarkable strides toward high performance of photodetectors attributed to its excellent carrier properties.However,semimetal,owning to the high carrier concentration and low carrier mobility compared to those of semiconductor,is generally considered unsuitable for photodetection.Herein,we demonstrate an outstanding photodetection in a layered semimetal titanium diselenide(TiSe_(2))in Bose-Einstein condensation(BEC)state.High sensitivity of semimetal photodetector is realized in the range of visible,infrared and terahertz bands.The noise equivalent power(NEP)has threefold improvement at the visible and infrared wavebands,and significant decrease by one order of magnitude in the terahertz frequencies via BEC phenomenon,attributed to the electrical parameter variation after condensation.The best NEP value in the terahertz frequency is comparable to that of commercial Si photodetector.Our results show another recipe to fabricate high performance of photodetection via semimetal except for semiconductor and pave the way to exploit macroscopic quantum phenomena for optoelectronics. | Tuntan Wu Qinxi Qiu Yongzhen Li Qiangguo Zhou Wanli Ma Jingbo Li Lin Jiang Wei Zhou Zhiming Huang | 2024 | InfoMat2024，6，2： | 0 |
| 4 | Rosuvastatin alleviates renal injury in cardiorenal syndrome model rats through anti-inflammatory and antioxidant pathways显示文摘Background:Cardiorenal syndrome is increasingly common and has been reported to be associated with inflammation and oxidative stress,and statins have anti-inflammatory and antioxidant effects.Therefore,we designed this experiment to study the preventive effect of statins on cardiorenal syndrome.The aim of the study is to investigate the effect of early rosuvastatin use on cardiorenal syndrome.Method:Forty-five Wistar rats were randomly divided into 3 groups.A unilateral nephrectomy group(Group 1),a unilateral nephrectomy+coronary ligation group(Group 2),and a unilateral nephrectomy+coronary ligation+rosuvastatin group(Group 3).Right kidney removal was performed on all rats during the first week,while Group 3 was given statin intragastric administration at 10 mg/kg/d.One month later,coronary ligation was performed on rats in Groups 2 and 3.Group 3 continued statin treatment.After feeding for 3 months and 2 days,the rats were killed;urine and blood were collected and sent to the laboratory for the determination of the urinary protein/creatinine ratio and blood lipid,creatinine,and urea nitrogen levels,respectively.Serum interleukin 1β,interleukin 6,malondialdehyde,glutathione peroxidase,angiotensin II,neutrophil gelatinase-associated lipocalin,cystatin C,and B natriuretic peptide levels were also determined.On the day before euthanasia,all rats were anesthetized and examined by cardiac ultrasound.Hematoxylin-eosin and periodic acid–Schiff staining were performed on heart and kidney sections.Results:The ejection fraction in Group 2 was lower than that in Group 1(P<0.01).The ejection fraction value in Group 3 was lower than that in Group 1(P<0.01).Interleukin-1βlevels in Group 2 were higher than those in Group 1(P<0.01).Interleukin-1βlevels in Group 3 were lower than those in Group 2(P<0.01).The malondialdehyde value in Group 3 was lower than that in Group 2(P<0.05).Histopathology showed that Group 1 had slight renal damage,renal injury was aggravated in Group 2,and renal injury was still present in Group 3,but with alleviated morphology.Conclusion:The interaction of the heart and kidneys in rats is related to inflammation and oxidation.Rosuvastatin can slow down the development of the heart-kidney interaction through anti-inflammatory and antioxidant effects. | Biye Zhou Qiangguo Ao Hua Zhao Ping Ye | 2022 | Emergency and Critical Care Medicine2022，2，4： | 0 |
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