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Trade-off analyses between food provision and soil conservation service of Grain for Green Program in Mountainous Area

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International Soil and Water Conservation Research 2024年第1期12卷 43-53页

作者： Yawen Li Yuxiang Li Xingwu Duan Zhongyin Cai Ya Li baiyun he Long Yin Institute of International River and Eco-security Yunnan UniversityKunming650091PR China Yunnan Key Laboratory of International Rivers and Trans-boundary Eco-security Kunming650091PR China State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100085PR China University of Chinese Academy of Sciences Beijing100049PR China

The Grain for Green Program and soil and water conservation engineering initiatives are crucial for controlling erosion in steep-slope ***,it is still unclear how these two management methods should be carried out in respect to the situation in mountainous ***,taking a typical mountainous area in southwest China as an example,we simulated six scenarios in order to compare the food provisioning service(FPS)and soil conservation service of the Grain for Green Program(converting to grassland)and Construction Measures(converting to sloping terrace)under different *** showed that when farmland with a>25°slope was converted into grassland,the amount of soil erosion(M)decreased by 21.0%,while FPS decreased by only 0.7%.However,when farmland with a>25°slope was converted into sloping terrace,M decreased by 31.3%while FPS increased by 18.7%.With the increases of farmland slope ranges in the Construction Measures scenario,M gradually decreased and FPS gradually *** when farmland>15°was converted into sloping terrace,M decreased by 63.9%and FPS increased by 52.7%.Furthermore,the trade-offs of Construction Measures are lower than that of Grain for Green on different slope ***,we conclude that Construction Measures are a more suitable method in mountainous areas than the Grain for Green,and we suggest that further research be conducted to consider the ecological risks of construction engineering measures.

关键词： Soil erosion Grain for green Construction measures Mountainous areas

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Processing TiAl-Based Alloy by Elemental Powder Metallurgy

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Journal of Materials Science & Technology 2000年第6期16卷 605-610页

作者： Yong LIU, baiyun HUANG, Yuehui he and Kechao ZHOU (National Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083, China) [Manuscript received July 31, 1999, in revised form November 19, 1999] Natl. Key Lab. for Powder Metallurgy Central South Univ. of Technol. Changsha 410083 China

TiAI-based alloys with various compositions (including Ti-48Al, Ti-47Al-2Cr-2Nb, Ti-47Al-2Cr-2Nb-0.2B and Ti-47Al-3Cr, in mole fraction) had been prepared by elemental powder metallurgy (EPM). The results have shown that the density of the prepared Ti-48AI alloy increases with increasing hot pressing temperature up to 1300℃. The Ti-48AI alloy microstructure mainly consisted of island-like Ti3Al phase and TiAl matrix at hot pressing temperature below 1300℃, however, coarse α2/γ lamellar colonies and γ grains appeared at 1400℃. It has also indicated that the additions of elemental Cr and B can refine the alloy microstructure. The main microstructural inhomogeneity in EPM TiAI-based alloys was the island-like α2 phase or the aggregate of α2/γ lamellar colony, and such island-like structure will be inherited during subsequent heat treatment in (α＋γ) field. Only after heat treatment in a field would this structure be eliminated. The mechanical properties of EPM TiAl-based alloys with various compositions were tested, and the effect of alloy elements on the mechanical properties was closely related to that of alloy elements on the alloy microstructures. Based on the above results, TiAI-based alloy exhaust valves were fabricated by elemental powder metallurgy and diffusion joining. The automobile engine test had demonstrated that the performance of the manufactured valves was very promising for engine service.

关键词： TiAl Processing TiAl-Based Alloy by Elemental Powder Metallurgy

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SUPERPLASTIC BEHAVIOR OF HOT-FORGED TiAl-BASED ALLOY

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中国有色金属学会会刊：英文版 1999年第2期9卷 74-76页

作者： Deng Zhongyong, Huang baiyun , he Yuehui and Liu Yong State Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083, P. R. China Central South Univ of Technology Changsha China

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｉＡｌｂａｓｅｄａｌｏｙｓａｒｅｃｏｎｓｉｄｅｒｅｄｔｈｅｍｏｓｔｆａｖｏｒａｂｌｅｃａｎｄｉｄａｔｅｓａｓａｄｖａｎｃｅｄｓｔｒｕｃｔｕｒａｌｍａｔｅｒｉａｌｓｆｏｒａｅｒｏｓｐａｃ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｉＡｌｂａｓｅｄａｌｏｙｓａｒｅｃｏｎｓｉｄｅｒｅｄｔｈｅｍｏｓｔｆａｖｏｒａｂｌｅｃａｎｄｉｄａｔｅｓａｓａｄｖａｎｃｅｄｓｔｒｕｃｔｕｒａｌｍａｔｅｒｉａｌｓｆｏｒａｅｒｏｓｐａｃｅａｐｐｌｉｃａｔｉｏｎｂｅｃａｕ...

关键词： TiAldeformationsuperplasticitystrain rate

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EFFECTS　OF　Ca　ADDITIONON　TiAl-BASED　ALLOYS

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中国有色金属学会会刊：英文版 1997年第1期7卷 143-146页

作者： Cao Peng,Huang baiyun,he Yuehui,Qu Xuanhui Powder Metallurgy Research Institute,

ＥＦＦＥＣＴＳＯＦＣａＡＤＤＩＴＩＯＮＯＮＴｉＡｌＢＡＳＥＤＡＬＬＯＹＳ①①ＣａｏＰｅｎｇ，ＨｕａｎｇＢａｉｙｕｎ，ＨｅＹｕｅｈｕｉ，ＱｕＸｕａｎｈｕｉＰｏｗｄｅｒＭｅｔａｌｕｒｇｙＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔ... 详细信息

ＥＦＦＥＣＴＳＯＦＣａＡＤＤＩＴＩＯＮＯＮＴｉＡｌＢＡＳＥＤＡＬＬＯＹＳ①①ＣａｏＰｅｎｇ，ＨｕａｎｇＢａｉｙｕｎ，ＨｅＹｕｅｈｕｉ，ＱｕＸｕａｎｈｕｉＰｏｗｄｅｒＭｅｔａｌｕｒｇｙＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉ...

关键词： TiAl based alloy alloying mechanical properties fracture

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SUPERPLASTIC BEHAVIOUR OF A FINE GRAINED TiAl BASED ALLOY TREATED BY MULTI-STEP TheRMO-MECHANICAL TREATMENT

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中国有色金属学会会刊：英文版 1998年第1期8卷 108-109页

作者： Huang baiyun, Deng Zhongyong and he YuehuiPowder Metallurgy Research Institute,Central South University of Technology, Changsha 410083, P. R. ChinaSun Jian and Liu QinDepartment of Materials Science and EngineeringShanghai Jiao Tong University Powder Metallurgy Research Institute Central South University of Technology Changsha 410083 China Department of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200030 China

ＳＵＰＥＲＰＬＡＳＴＩＣＢＥＨＡＶＩＯＵＲＯＦＡＦＩＮＥＧＲＡＩＮＥＤＴｉＡｌＢＡＳＥＤＡＬＬＯＹＴＲＥＡＴＥＤＢＹＭＵＬＴＩＳＴＥＰＴＨＥＲＭＯＭＥＣＨＡＮＩＣＡＬＴＲＥＡＴＭＥＮＴ①ＨｕａｎｇＢａｉｙｕｎ，Ｄ... 详细信息

ＳＵＰＥＲＰＬＡＳＴＩＣＢＥＨＡＶＩＯＵＲＯＦＡＦＩＮＥＧＲＡＩＮＥＤＴｉＡｌＢＡＳＥＤＡＬＬＯＹＴＲＥＡＴＥＤＢＹＭＵＬＴＩＳＴＥＰＴＨＥＲＭＯＭＥＣＨＡＮＩＣＡＬＴＲＥＡＴＭＥＮＴ①ＨｕａｎｇＢａｉｙｕｎ，ＤｅｎｇＺｈｏｎｇｙｏｎｇａｎｄＨｅ...

关键词： TiAl forging superplasticity

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SYNTheSIS OF Ti-47Al-2Cr-2Nb ALLOY THROUGH ELEMENTAL POWDER METALLURGY

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中国有色金属学会会刊：英文版 1998年第4期8卷 39-44页

作者： Liu Yong, Huang baiyun and he Yuehui Powder Metallurgy Research Institute, Central South University of Technology, Changsha 410083, P. R. China

ＩＮＴＲＯＤＵＣＴＩＯＮＴｉＡｌｂａｓｅａｌｏｙｓｈａｖｅａｔｒａｃｔｅｄｍｏｒｅａｎｄｍｏｒｅａｔｅｎｔｉｏｎｂｙｔｈｅｉｒｈｉｇｈｓｐｅｃｉｆｉｃｓｔｒｅｎｇｔｈ，ｓｐｅｃｉｆｉｃｒｉｇｉｄｉｔｙａｎｄｅｘｃｅ... 详细信息

ＩＮＴＲＯＤＵＣＴＩＯＮＴｉＡｌｂａｓｅａｌｏｙｓｈａｖｅａｔｒａｃｔｅｄｍｏｒｅａｎｄｍｏｒｅａｔｅｎｔｉｏｎｂｙｔｈｅｉｒｈｉｇｈｓｐｅｃｉｆｉｃｓｔｒｅｎｇｔｈ，ｓｐｅｃｉｆｉｃｒｉｇｉｄｉｔｙａｎｄｅｘｃｅｌｅｎｔｐｒｏｐｅｒｔｉｅｓａｔｅ...

关键词： elemental powder metallurgy TiAl base alloys synthesis

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Spatial Distribution of Carbon, Nitrogen and Phosphorus within Surface Sediments in the Lower Lancang River: Pollution Assessment Related to Dams

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Journal of Environmental Protection 2018年第13期9卷 1343-1358页

作者： Hongjun Lu Kaidao Fu Ting Dong Wanhui Peng Xiaorui Song baiyun he Liyuan Wang Institute of International Rivers and Eco-Security Yunnan Key Laboratory of International Rivers and Trans-Boundary Eco-Security Yunnan University Kunming China

Surface sediment is one of the main sources of nutrients in overlying water environments, and these can also indirectly reflect the degree of eutrophication. In this paper, the spatial distribution characteristics of total organic carbon (TOC), total nitrogen (TN) and total phosphorus (TP) in the surface sediments of 11 sections in the lower Lancang River during flood season are analyzed, as well as the distribution of phosphorus in different forms. The main sources of TOC and its correlation with TN and TP are discussed and, finally, the pollution levels of the surface sediments are evaluated. The results show that the average content of TOC in the surface sediments of the lower Lancang River is 9003.75 mg/kg. The average TN content is 893.79 mg/kg, while the average TP content is 521.35 mg/kg. The TOC in the surface sediments of the lower Lancang River is derived mainly from algae and plankton in the river, and the TN and TP have similar sources. The total phosphorus in the surface sediments of the lower Lancang River is composed mainly of calcium-bound phosphorus (Ca-P). The evaluations of the organic pollution index and comprehensive pollution index show that the surface sediment pollution degree at the upper sections of the Nuozhadu and Jinghong Dams are more serious than those below the dams. Furthermore, the tributary sections are all slightly polluted, with the exception of the Mengyang River, which is considered moderately polluted.

关键词： Lancang River Surface Sediment Nutrients Spatial Distribution Pollution Assessment

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High-dose dexamethasone regulates microglial polarization via the GR/JAK1/STAT3 signaling pathway after traumatic brain injury

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Neural Regeneration Research 2025年第9期20卷 2611-2623页

作者： Mengshi Yang Miao Bai Yuan Zhuang Shenghua Lu Qianqian Ge Hao Li Yu Deng Hongbin Wu Xiaojian Xu Fei Niu Xinlong Dong Bin Zhang baiyun Liu Beijing Tiantan Hospital Capital Medical UniversityBeijingChina Department of Neurology The First Hospital of Tsinghua UniversityBeijingChina Department of Neurotrauma and Beijing Key Laboratory of Central Nervous System Injury Beijing Neurosurgical InstituteCapital Medical UniversityBeijingChina Department of Critical Care Medicine Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Center for Nerve Injury and Repair Beijing Institute of Brain DisordersChina National Clinical Research Center for Neurological DiseasesBeijingChina

Although microglial polarization and neuroinflammation are crucial cellular responses after traumatic brain injury,the fundamental regulatory and functional mechanisms remain insufficiently *** potent anti-inflammato ry agents,the use of glucoco rticoids in traumatic brain injury is still controversial,and their regulatory effects on microglial polarization are not yet *** the present study,we sought to determine whether exacerbation of traumatic brain injury caused by high-dose dexamethasone is related to its regulatory effects on microglial polarization and its mechanisms of *** vitro cultured BV2 cells and primary microglia and a controlled cortical impact mouse model were used to investigate the effects of dexamethasone on microglial ***,dexamethasone,RU486(a glucocorticoid receptor antagonist),and ruxolitinib(a Janus kinase 1 antagonist)were ***-sequencing data obtained from a C57BL/6 mouse model of traumatic brain injury were used to identify potential targets of *** Morris water maze,quantitative reverse transcription-polymerase chain reaction,western blotting,immunofluorescence and confocal microscopy analysis,and TUNEL,Nissl,and Golgi staining were performed to investigate our ***-throughput sequencing results showed that arginase 1,a marker of M2 microglia,was significantly downregulated in the dexamethasone group compared with the traumatic brain injury group at3 days post-traumatic brain *** dexamethasone inhibited M1 and M2 microglia,with a more pronounced inhibitory effect on M2microglia in vitro and in *** receptor plays an indispensable role in microglial polarization after dexamethasone treatment following traumatic brain ***,glucocorticoid receptor activation increased the number of apoptotic cells and neuronal death,and also decreased the density of dendritic spines.A possible downstream receptor signaling mechanism is th

关键词： apoptosis BV2 microglia dexamethasone glucocorticoid receptor glucocorticoids innate immune system microglial polarization neuroinflammation primary microglia traumatic brain injury

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次声信号对缢蛏(Sinonovacula Constricta Lamarck)幼体生长、发育的影响

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海洋通报 1985年第1期 58-62页

作者：沈持衡陈柏云何灌生厦门大学

一、次声对一般生物的作用人耳听不到的超低频次声（Infrasound）,直至1960年以后,由于其对环境发生污染,才逐渐为人们所注意。其中如Evans氏曾报导其声强在100分贝(以2×10-4微巴为基数)以上、频率2至20赫间之次音,可使人发生吞咽及... 详细信息

一、次声对一般生物的作用人耳听不到的超低频次声（Infrasound）,直至1960年以后,由于其对环境发生污染,才逐渐为人们所注意。其中如Evans氏曾报导其声强在100分贝(以2×10-4微巴为基数)以上、频率2至20赫间之次音,可使人发生吞咽及呼吸困难,以及头昏头疼情绪紧张或昏昏欲睡,出汗及振颤等症状;Mixon氏报导,在150分贝左右、20赫以下的强次音,可使人耳产生疼感及压力感;而用更强的次声对动物做试验表明,6至9赫的195分贝以上的次

关键词：幼体信号刺激面盘幼虫 Sinonovacula Constricta Lamarck 声信号

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ABRADABILITY EVALUATION AND TRIBOLOGICAL BEHAVIOUR OF ABRADABLE SEAL COATING

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中国有色金属学会会刊：英文版 1998年第3期8卷 104-112页

作者： Yi, Maozhong he, Jiawen Huang, baiyun Zhou, Huijiu Central South Univ of Technology Changsha China

１ＩＮＴＲＯＤＵＣＴＩＯＮＬａｒｇｅｐｒｏｐｕｌｓｉｖｅｆｏｒｃｅ，ｈｉｇｈｅｆｉｃｉｅｎｃｙａｎｄｌｏｗｆｕｅｌｃｏｎｓｕｍｐｔｉｏｎａｒｅｔｈｅｏｂｊｅｃｔｉｖｅｏｆｔｈｅｄｅｓｉｇｎａｎｄｍａｎｕｆａｃｔｕｒ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＬａｒｇｅｐｒｏｐｕｌｓｉｖｅｆｏｒｃｅ，ｈｉｇｈｅｆｉｃｉｅｎｃｙａｎｄｌｏｗｆｕｅｌｃｏｎｓｕｍｐｔｉｏｎａｒｅｔｈｅｏｂｊｅｃｔｉｖｅｏｆｔｈｅｄｅｓｉｇｎａｎｄｍａｎｕｆａｃｔｕｒｅｏｆａｉｒｃｒａｆｔｔｕｒｂｉｎ...

关键词： abradable seal coating abradability sliding friction and wear

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