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| 1 | Interleukin 17-Producing γδ T Cells Increased in Patients with Active Pulmonary Tuberculosis显示文摘Although it has been known that γδ T cells may play an important role in the immune response to infection of Mycobacterium tuberculosis (M. tb), the mechanisms by which the γδ T cells participate in the innate and/or acquired immunity to tuberculosis (TB) have not been full elucidated. In the present study, 27 patients with active pulmonary TB and 16 healthy donors (HD) were performed. We found that proportion of IL-17-producing cells among lymphocyte was similar between TB patients and HD, whereas the proportions of γδ T cells in IL-17-producing cells (59.2%) and IL-17-producing cells in γδ T cells (19.4%) in peripheral blood were markedly increased in TB patients when compared to those in HD (43.9% and 7.7%, respectively). In addition, the proportions of IFN-γ-producing γδ T cells in TB patients were obviously lower than that in HD. Upon re-stimulated with M. tb heat-treated antigen (M. tb-HAg) in vitro, fewer IL-17-producing γδ T cells were generated from HD and TB patients, whereas IFN-γ-producing γδ T cells were increased in TB patients compared to that in HD. Our findings in TB patients and healthy human were consistent with other murine investigation that the IL-17-producing γδ T cells were main source of IL-17 in mouse model of BCG infection, suggesting that γδ T cells might be involved in the formation of tubercular granuloma in pulmonary TB patients, but need further identification. | Meiyu Peng Zhaohua Wang Chunyan Yao Lina Jiang Qili Jin Jing Wang Baiqing Li | 2008 | Cellular & Molecular Immunology2008，5，3： | 28 |
| 2 | Effects of the two-step ageing treatment on the microstructure and properties of 7B04 alloy pre-stretched thick plates显示文摘The effects of the two-step ageing parameters (temperature and time) on the mechanical properties and electrical conductivity of 7B04 (Al-Zn-Mg-Cu) pre-stretched thick plates were studied. The results reveal that the initial T1 ageing contributes a major increase of the tensile strength, and the 0.2% proof stress value reaches 482 MPa after ageing for 7 h at 115°C. Behavioral differences in the tensile properties of the alloy after the two-step ageing treatment were less with the first-step ageing at 115°C for different time periods (7, 14, and 21 h). The effects of the second ageing parameters on the properties and microstructure of the 7B04 alloy were remarkable. TEM analysis of the samples aged at Temper I (7 h at 115°C + 12 h at 160°C) and Temper II (7 h at 115°C + 16 h at 165°C) indicates that two kinds of phases, i.e. η′ and η phases, precipitate from the matrix and efficiently improve the tensile strength of the alloy, and the grain boundary precipitates are coarse and discrete. There are obvious precipitate free zones (PFZs) along the grain boundary in the microstructure of the alloy after the two-step ageing treatment. | LI Zhihui XIONG Baiqing ZHANG Yong 'an ZHU Baohong WANG Feng LIU Hongwei | 2007 | Rare Metals2007，26，3： | 24 |
| 3 | Effects of cooling rate on the fracture properties of TA15 ELI alloy plates显示文摘The effects of cooling rate on the mechanical properties and the fatigue crack growth behavior of TA15 ELI alloy plates with different microstructures were investigated at room temperature. The results indicate that the cooling rate (water quench, air cooling, and furnace cooling) has a pronounced influence on the mechanical properties and on the fatigue crack growth, especially for air cooling and furnace cooling. Optical microstructure observation and scanning electron microscopy of tensile fracture surfaces were performed to gain an insight into the mechanism of properties. The dependence of me-chanical properties and fatigue crack growth behavior on the cooling rate can be attributed to the α lamellae width and the α colony size, which induce the change in slip length. The microstructure produced by air cooling shows the best damage tol-erance behavior when compared with water quench and furnace cooling. | LI Shikai XIONG Baiqing HUI Songxiao | 2007 | Rare Metals2007，26，1： | 15 |
| 4 | Orogenic and Anorogenic Granitoids in the Altay Mountains of Xinjiang and Their Discrimination Criteria显示文摘On the basis of field geological studies of the granotoids in the region, mineralogical, petrological, geochemical(including stable isotope geochemical) and isotopic geochronological investigations were carried out on selected representative granitic bodies of various types. The authors have concluded that, apart from the bodies of the orogenic granitoid series, there also exist intrusions of the anorogenic granitoid series in the region. The intrusives of the two series were formed not only in different ages and tectonic environments, but also were derived from different sources of materials. Moreover, they are associated with different mineralizations, belonging to different minerologenetic series(Cheng et al., 1983). They show distinctly a series of discriminative criteria. The problems under discussion in the present paper are of important theoretical and practical significance in the studies of granites of the orogenic belt, particularly the studies of the genesis and related metallogeny of the granites of the region. | Zou Tianren Institute of Mineral Deposits, Chinese Academy of Geological Sciences, Beijing Chao Huizhi and Wu Baiqing Xinjiang Institute of Geology, Ministry of Metallurgical Industry Urumqi, Xinjiang Jiang Minxi | 1989 | Acta Geologica Sinica(English Edition)1989，63，1： | 14 |
| 5 | Study of altitudinal lapse rates of δ^(18)O in precipitation/river water with seasons on the southeast Tibetan Plateau显示文摘Seasonal δ 18O variation in water on the southeast Tibetan Plateau has been studied, showing the consistent variation pattern of δ 18O with altitude indicative of relevant atmospheric circulation processes. Study shows a similar variation pattern of fixed-site river water δ 18O with that of the precipitation δ 18O in southeast Tibet. δ 18O in regional rivers in southeast Tibet demonstrates a gradual depletion with increasing altitude, though the rates vary seasonally. The most depleted river 18O occurs during the monsoon period, with the lowest δ 18O/altitude lapse rate. The river 18O during the westerly period is also depleted, together with low δ 18O/altitude lapse rate. The pre-monsoon rivers witness the most enriched 18O with least significant correlation coefficient with the linear regression, whilst the postmonsoon rivers witness the largest δ 18O/altitude lapse rate. Different coherence of seasonal δ 18O variation with the altitude effect is attributed to different moisture supplies. Though sampling numbers vary with seasons, the δ 18O-H linear correlation coefficients all reach the 0.05 confidence level, thus witnessing the variation features of δ 18O in seasonal river water due to the influence of atmospheric general circulation and land surface processes revealed from the altitudinal lapse rates. | YANG XiaoXin XU BaiQing YANG Wei QU DongMei LIN Ping-Nan | 2009 | Chinese Science Bulletin2009，54，16： | 13 |
| 6 | Effect of one-step aging on microstructure and properties of a novel Al-Zn-Mg-Cu-Zr alloy显示文摘The effect of one-step aging temper on the mechanical properties, electrical conductivity and the microstructure of a novel Al-7.5Zn-1.6Mg-1.4Cu-0.12Zr alloy has been investigated. The results indicated that with elevating the aging temperature from 100℃ to 160℃, the aging response rate was greatly accelerated, and the UTS at peak aging condition decreased, while the corresponding TYS increased. However, the electrical conductivity of the alloy became higher. After aging for 24 h at 120℃, the peak UTS and TYS values were achieved as 591 MPa and 541 MPa, respectively; but the alloy achieved a lower conductivity, 20.4 MS/m. When T6 temper was performed at 140℃ for 14 h, the UTS decreased only by 1% of the former, whereas the TYS and the electrical conductivity increased obviously, which were up to 559 MPa and 22.6 MS/m, respectively. The major strengthening precipitates of the peak-aged alloy were GP zones and η′ phase. The precipitates in both the matrix and the grain boundary became coarser with rising aging temperature. There were obvious PFZs along the grain boundary both in T6 conditions aged at 140℃ and 160℃. | LI XiWu XIONG BaiQing ZHANG YongAn HUA Cheng WANG Feng ZHU BaoHong LIU HongWei | 2009 | Science China(Technological Sciences)2009，52，1： | 13 |
| 7 | Effect of Zn addition on microstructure and mechanical properties of an Al–Mg–Si alloy显示文摘In the present work, an Al–0.66Mg–0.85Si–0.2Cu alloy with Zn addition was investigated by electron back scattering diffraction(EBSD), high resolution electron microscopy(HREM), tensile and Erichsen tests. The mechanical properties of the alloy after pre-aging met the standards of sheet forming. After paint baking, the yield strength of the alloy was improved apparently. GP(Ⅱ) zones and η'phases were formed during aging process due to Zn addition. With the precipitation of GP zones, β″ phases, GP(Ⅱ) zones and η'phases, the alloys displayed excellent mechanical properties. | Lizhen Yan Yongan Zhang Xiwu Li Zhihui Li Feng Wang Hongwei Liu Baiqing Xiong | 2014 | Progress in Natural Science:Materials International2014，24，2： | 13 |
| 8 | Potential key technologies for 6G mobile communications显示文摘The standard development of 5G wireless communication culminated between 2017 and 2019,followed by the worldwide deployment of 5G networks,which is expected to result in very high data rate for enhanced mobile broadband,support ultrareliable and low-latency services and accommodate massive number of connections.Research attention is shifting to future generation of wireless communications,for instance,beyond 5G or 6G.Unlike previous studies,which discussed the use cases,deployment scenarios,or new network architectures of 6G in depth,this paper focuses on a few potential technologies for 6G wireless communications,all of which represent certain fundamental breakthrough at the physical layer—technical hardcore of any new generation of wireless communications.Some of them,such as holographic radio,terahertz communication,large intelligent surface,and orbital angular momentum,are of revolutionary nature and many related studies are still at their scientific exploration stage.Several technical areas,such as advanced channel coding/modulation,visible light communication,and advanced duplex,while having been studied,may find more opportunities in 6 G. | Yifei YUAN Yajun ZHAO Baiqing ZONG Sergio PAROLARI | 2020 | Science China(Information Sciences)2020，63，8： | 13 |
| 9 | Ageing behavior of an Al-Zn-Mg-Cu alloy pre-stretched thick plate显示文摘The ageing behavior of a pre-stretched thick plate of Al-Zn-Mg-Cu alloy was systemically studied including one-step ageing, two-step ageing, and retrogression and reageing treatment (RRA). One-step ageing of the alloy resulted in peak ultimate tensile strengths of 595 and 575 MPa after 22 and 6 h at 120 and 135°C, respectively. The strengthening phase in peak aged (T6 temper) alloy contained GP zones and the η′ phase predominantly. After two-step ageing, the electrical conductivity was increased markedly, but the pre-stretched thick plate sacrificed a great loss of strength. RRA treatment provided a method for maintaining the strength close to that obtained by T6 temper and for obtaining the high electrical conductivity close to that obtained by T7 temper; the ultimate tensile strength and electrical conductivity were 583 MPa and 21.0 MS/m, respectively. TEM analysis of T7 and RRA specimens revealed two types of precipitates that contributed to age strengthening i.e. the η′ and η phases. | Zhihui Li Baiqing Xiong Yongan Zhang Baohong Zhu Feng Wang Hongwei Liu | 2007 | Journal of University of Science and Technology Beijing2007，14，3： | 12 |
| 10 | Atmospheric Pb variations in Central Asia since 1955 from Muztagata ice core record, eastern Pamirs显示文摘A Muztagata ice core recovered at 7010 m altitude in East Pamirs provides a Pb concentration record from 1955 to 2000. The result reveals in- creasing Pb concentrations from 1955 to 1993, with two Pb concentration peaks in 1980 and 1993. After 1993, Pb concentrations in ice core show an obvi- ously declining trend. Analysis shows that the lead in the Muztagata ice core mainly came from anthropo- genic emissions from countries in Central Asia, while the local emission had little contribution. | LI Zhen YAO Tandong TIAN Lide XU Baiqing LI Yuefang | 2006 | Chinese Science Bulletin2006，51，16： | 12 |
| 11 | Quick ice mass loss and abrupt retreat of the maritime glaciers in the Kangri Karpo Mountains, southeast Tibetan Plateau显示文摘The maritime glaciers are sensitive to climate change because of high annual precipitation and high air temperature in the region. A combined comprehensive study was carried out based on glacier mass balance observation, GPS-based glacier terminus position survey, glacier Ground Penetrating Radar, topography maps and RS satellite images in the Kangri Karpo Mountains, Southeast Tibet. The study revealed a strong ice mass loss and quick glacier retreat since the 1970s. Ata Glacier, one glacier from the south slope of the Kangri Karpo Mountains, has formed a 6-km-long terminal moraine zone at the end of the glacier since the 1970s, and the accelerating retreat is largely due to the strong glacier sur- face melting. Mass balance study on the other four glaciers on the northern side of the Kangri Karpo Mountains shows that they are in large negative mass balance and the glaciers had retreated 15―19 m from May 2006 to May 2007. The in-situ glacier observation also shows that the glacier retreat is more obvious in small glaciers. The enhanced ice mass deficit caused by climate warming and the ongoing extinction of many small glaciers in this region could seriously affect the water resources, environ- ments, local climate and regional sustainable development in the near future. | YANG Wei YAO TanDong XU BaiQing WU GuangJian MA LingLong XIN XiaoDong | 2008 | Chinese Science Bulletin2008，53，16： | 11 |
| 12 | Characteristics of recent temperate glacier fluctuations in the Parlung Zangbo River basin,southeast Tibetan Plateau显示文摘Little is known about recent variation of temperate glaciers on the Tibetan Plateau,although they are of particular theoretical and practical interests in terms of climate change and water supply.The study of glacier mass balance and terminus variation for six temperate glaciers in the Parlung Zangbo River basin,southeast Tibetan Plateau,shows the facts of the overall negative mass balance and the continued terminus retreat from 2005/2006 to 2007/2008.The mass balances of smaller glaciers were more negative compared to larger glaciers.Referring the trend of glacier mass balance in the Hengduan Mountains,the Himalayas and glacier shrinkage in southeast Tibetan Plateau,the mass loss and recession of temperate glacier in this region are expected if the current climate condition continues. | YANG Wei YAO TanDong XU BaiQing MA LingLong WANG ZhiHui WAN Ming | 2010 | Chinese Science Bulletin2010，55，20： | 11 |
| 13 | Major advances in studies of the physical geography and living environment of China during the past 70 years and future prospects显示文摘The natural environment provides material essentials for human survival and development. The characteristics,processes, regional differentiation and forcing mechanisms of the elements of the natural environment(e.g. geomorphology,climate, hydrology, soil, etc.) are the main objects of research in physical geography. China has a complex natural environment and huge regional differentiation and therefore it provides outstanding reserach opportunities in physical geography. This review summarizes the most important developments and the main contributions of research in the physical geography and human living environment in China during the past 70 years. The major topics addressed are the uplift of the Tibetan Plateau and the evolution of its cryosphere, the development of fluvial systems, the acidification of the vast arid region of the Asian interior, variations in the monsoon and westerly climate systems on multiple timescales, the development of lakes and wetlands, the watershed system model, soil erosion, past human-environment interactions, biogeography, and physical geographic zonality. After briefly introducing international research developments, we review the history of research in physical geography in China, focusing on the major achievements and major academic debates, and finally we summarize the status of current research and the future prospects. We propose that in the context of the national demand for the construction of an ecological civilization, we should make full use of the research findings of physical geography, and determine the patterns and mechanisms of natural environmental processes in order to continue to promote the continued contribution of physical geography to national development strategies, and to further contribute to the theory of physical geography from a global perspective. | Fahu CHEN Bojie FU Jun XIA Duo WU Shaohong WU Yili ZHANG Hang SUN Yu LIU Xiaomin FANG Boqiang QIN Xin LI Tingjun ZHANG Baoyuan LIU Zhibao DONG Shugui HOU Lide TIAN Baiqing XU Guanghui DONG Jingyun ZHENG Wei YANG Xin WANG Zaijun LI Fei Wang Zhenbo HU Jie WANG Jianbao LIU Jianhui CHEN Wei HUANG Juzhi HOU Qiufang CAI Hao LONG Ming JIANG Yaxian HU Xiaoming FENG Xingguo MO Xiaoyan YANG Dongju ZHANG Xiuhong WANG Yunhe YIN Xiaochen LIU | 2019 | Science China Earth Sciences2019，62，11： | 11 |
| 14 | Mechanical properties and microstructure of an α+β titanium alloy with high strength and fracture toughness显示文摘The Ti-Al-Sn-Zr-Cr-Mo-V-Si (Ti-62A) alloy, an alpha-beta alloy with high strength and fracture toughness, is currently used as an advanced structural material in aerospace and non-aerospace applications. Thermo-mechanical processes can be used to optimize the relationship between its strength and fracture toughness. A Ti-62A alloy bar can be machined through a transus β-forged plus α+β solution treated and aged specimen with a lamellar alpha microstructure. The effects of heat treatment on the mechanical properties were discussed. Heat treatment provided a practical balance of strength, fracture toughness, and fatigue crack growth resistance. A comparison of the Ti-62A alloy with the Ti-62222S alloy under the same thermo-mechanical processing conditions showed that their properties are at the same level. | YU Yang HUI Songxiao YE Wenjun XIONG Baiqing | 2009 | Rare Metals2009，28，4： | 8 |
| 15 | Age-hardening characteristic of an Al-Zn-Mg-Cu alloy produced by spray deposition显示文摘Al-10.8Zn-2.8Mg-1.9Cu alloy was synthesized by spray atomization and deposition technique. GP zones and age-hardening process in the alloy were investigated using high-resolution electron microscopy (HREM), selected area diffraction (SAD), and differential scanning calorimetry (DSC) analysis. The results indicated that spray deposition process accelerated the aging kinetics of the alloy at an aging temperature of 120°C, thereby reducing the peak aging time to 16 h. GPI and GPII are the two types of zones that are major precipitates for the alloy under peak-aged condition. The precipitation sequence for the alloy is also discussed. | WANG Feng XIONG Baiqing ZHANG Yongan ZHU Baohong LIU Hongwei ZHANG Zhihui WANG Zixing | 2007 | Rare Metals2007，26，2： | 7 |
| 16 | Influence of variation in precipitation on the δD values of terrestrial n-alkanes on the southern Tibetan Plateau显示文摘A short lake sedimentary core and ice core were recovered from Lake Chen Co and Noijingangsang Glacier,respectively,in the Lake Yamdrok watershed of the southern Tibetan Plateau.Hydrogen isotope ratios of the ice core(δDice) and δD values of terrestrial n-alkanes(δDwax) in the sediments showed a linear correlation(R2 = 0.41,P = 0.047) over the past 80 years,indicating the effect of hydrogen isotope ratios of precipitation(δDp) on δDwax.However,apparent fractionation(εwax-p) values of δDwax relative to δDice increased with decreasing ice core accumulation(amount of precipitation;R2 = 0.65,P = 0.0051),revealing that dry or wet climate variation had a significant impact on δDwax.Thus,precipitation amount and δDp are both important in determining δDwax. | XIE Ying XU BaiQing WU GuangJian LIN ShuBiao | 2012 | Chinese Science Bulletin2012，57，17： | 7 |
| 17 | Variation of culturable bacteria along depth in the East Rongbuk ice core,Mt.Everest显示文摘冰从从东方 Rongbuk 冰河被钻的 22.27 m 冰核心融化水,埃韦雷斯特山是以二个孵化方法的孵化:板直接融化水并且丰富融化水优先的板分别地。许多可耕种的细菌与 1385 的一个总数在二孵化从 0295 CFU mL1 到 01720 CFU mL1 孤立获得。比较指导耕作,丰富耕作恢复了更多的细菌。生产颜料的细菌说明了因为 84.9% 总数的一般水准孤立。如此的高百分比建议那颜料生产可以是为在冰核心的细菌的一个适应生理的特征在冰河上应付强壮的紫外放射。许多可耕种的细菌并且生产颜料孤立沿着深度同时地变化了:在中间的更高的丰富并且在顶和底部更低。它显示冰核心的中间的部分为微生物引起的幸存是好客的。基于殖民地的生理的性质, 89 孤立为种系发生的分析被选择。获得的 16S rRNA 基因序列掉进四个组:Firmicutes, Alpha-Proteobacteria, Gamma-Proteobacteria,和 Actinobacteria,与是主导的 Firmicutes。微生物引起的作文源于直接并且丰富耕作没被重叠。我们建议探索 culturable 是一个更好的方法在由联合途径的冰核心的微生物引起的差异直接并且丰富耕作。 | Liang Shen Tandong Yao Baiqing Xu Hongmei Wang Nianzhi Jiao Shichang Kang Xiaobo Liu Yongqin Liu | 2012 | Geoscience Frontiers2012，3，3： | 7 |
| 18 | Aging behavior and fatigue crack propagation of high Zn-containing Al-Zn-Mg-Cu alloys with zinc variation显示文摘In the present work, the influence of two-step aging treatments on hardness, electrical conductivity and mechanical properties of two high Zn-containing Al-Zn-Mg-Cu alloys with zinc content variation was investigated and the detailed T76 aging parameters were proposed. The microstructure of the precipitates were studied by transmission electron microscopy(TEM) and high-resolution transmission electron microscopy(HREM) and then quantitatively investigated with the aid of an image analysis. The fatigue performances were researched by the fatigue crack propagation(FCP) rate test and fracture morphology was observed with scanning electron microscopy(SEM). The results show that the matrix precipitate size distributions of both alloys had significant difference, so as to fatigue crack propagation rates and fracture appearance. The shear and bypass mechanisms of dislocation-precipitate interactions were employed to explain the difference. Among the shearable precipitates, the proportion of larger size precipitates for the higher zinc content alloy is bigger than that for the lower zinc content alloy. The coarse shearable precipitates hinder the propagation of the fatigue cracks, leading to inferior FCP rate. For both alloys, the shear mechanism possesses the dominant factor, finally causing a preponderance in the FCP resistance for the higher zinc content alloy than the lower one. | Kai Wen Yunqiang Fan Guojun Wang Longbing Jin Xiwu Li Zhihui Li Yongan Zhang Baiqing Xiong | 2017 | Progress in Natural Science:Materials International2017，27，2： | 7 |
| 19 | Dynamic fracture toughness of TA15ELI alloy studied by instrumented impact test显示文摘The dynamic fracture toughness of TA15ELI alloy with two types of microstructures was studied by instrumented impact test.Charpy specimens with both the 0.2 mm U-notch and the a/W = 0.2 pre-crack were adopted to compare notch sensitivity in the two microstructures.The result shows that the specimen with Widmanst?tten microstructure exhibits a better dynamic fracture toughness and lower notch sensitivity than that with lath-like microstructure.Fracture surfaces in the case of the two microstructures are analyzed to have a ductile and brittle mixed feature under dynamic loading.The fracture surface of lath-like microstructure is composed of dimples and tear ridges,while that of Widmanst?tten microstructure is covered with rough block-like facets and dimples and tear ridges.The α phase boundaries and α/β interfaces act as locations for void nucleation and crack arrest and deviation.The decrease in width of α phase lamellae leads to the increase in the amount of boundaries and interfaces,which causes the increase in the consumption of impact energy and results in the improvement in dynamic fracture toughness. | LIU Rui,HUI Songxiao,YE Wenjun,XIONG Baiqing,YU Yang,and FU Yanyan State Key Laboratory for Fabrication & Processing of Nonferrous Metals,General Research Institute for Nonferrous Metals,Beijing 100088,China | 2010 | Rare Metals2010，29，6： | 6 |
| 20 | Organochlorine pesticides in fresh-fallen snow on East Rongbuk Glacier of Mt.Qomolangma (Everest)显示文摘During a field campaign in April 2005,fresh-fallen snow samples were collected on the East Rongbuk Glacier of the Mt. Qomolangma at four altitudes (6500 m,6300 m,6100 m and 5900 m),to study the role of Mt. Qomolangma as 'cold-traps' for Persistent Organic Pollutants. From these snow samples col-lected at the highest-altitude,organochlorine pesticides (OCPs):HCB,p,p′-DDT and p,p′-DDD were detected,with the concentrations in the ranges of 44―72 pg/L,401―1560 pg/L,and 20―80 pg/L,re-spectively. The concentration of o,p′-DDT was around the method detection limit. Analysis of backward trajectories showed that the detected compounds came from the north of India,suggesting that DDTs detected in the snow were possibly originated from new emissions in this area. Relationships between the concentrations of OCPs in snow samples and the sampling altitudes were discussed. The altitudes had no obvious effect on HCB concentrations in the fresh-fallen snow,while increases in the concen-trations of p,p′-DDT and p,p′-DDD with increasing altitude were found,which was reversed compared to the trends observed in North America. Three factors likely resulted in this trend: (1) the properties of the target compounds; (2) the low temperatures at high altitudes; and (3) the location of the mountain sampling sites relative to their sources. | WANG Feng ZHU Tong XU BaiQing KANG ShiChang | 2007 | Science China Earth Sciences2007，50，7： | 6 |
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