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163篇 您的检索式:作者名="Guangyu Liu"
    题名 作者 年代 出处 被引量
1Temporal and spatial variations of the active layer along the Qinghai-Tibet Highway in a permafrost region显示文摘Using monitored active layer thickness(ALT) and environmental variables of 10 observation fields along the Qinghai-Tibet Highway in permafrost region of the Qinghai-Tibetan Plateau(QTP),a model for ALT estimation was developed.The temporal and spatial characteristics of the ALT were also analyzed.The results showed that in the past 30 years ALT in the study region increased at a rate of 1.33 cm a-1.Temperatures at the upper limit of permafrost and at 50 cm depth,along with soil cumulative temperature at 5 cm depth also exhibited a rising trend.Soil heat flux increased at a rate of 0.1 Wm-2 a-1.All the above changes demonstrated that the degradation of permafrost happened in the study region on the QTP.The initial thawing date of active layer was advanced,while the initial freezing date was delayed.The number of thawing days increased to a rate of 1.18 da-1.The variations of active layer were closely related to the permafrost type,altitude,underlying surface type and soil composition.The variations were more evident in cold permafrost region than in warm permafrost region,in high-altitude region than in low-altitude region,in alpine meadow region than in alpine steppe region;and in fine-grained soil region than in coarse-grained soil region.LI Ren ZHAO Lin DING YongJian WU TongHua XIAO Yao DU ErJi LIU GuangYue QIAO YongPing 2012Chinese Science Bulletin2012,57,35:51
2Epidemiological and risk analysis of the H7N9 subtype influenza outbreak in China at its early stage显示文摘Dozens of human cases infected with H7N9 subtype avian influenza virus (AIV) have been confirmed in China since March, 2013. Distribution data of sexes, ages, professions and regions of the cases were analyzed in this report. The results showed that the elderly cases, especially the male elderly, were significantly more than expected, which is different from human cases of H5N1 avian influenza and human cases of the pandemic H1N1 influenza. The outbreak was rated as a Grade Ⅲ (severe) outbreak, and it would evolve into a Grade IV (very severe) outbreak soon, using a method reported previously. The H7N9 AIV will probably circulate in humans, birds and pigs for years. Moreover, with the driving force of natural selection, the virus will probably evolve into highly pathogenic AIV in birds, and into a deadly pandemic influenza virus in humans. Therefore, the H7N9 outbreak has been assumed severe, and it is likely to become very or extremely severe in the future, highlighting the emergent need of forceful scientific measures to eliminate any infected animal flocks. We also described two possible mild scenarios of the future evolution of the outbreak.ZHUANG QingYe WANG SuChun WU MeiLi LIU Shuo JIANG WenMing HOU GuangYu LI JinPing WANG KaiCheng YU JianMin CHEN JiMing CHEN JiWang 2013Chinese Science Bulletin2013,58,26:18
3Hyperbaric oxygen therapy improves cognitive functioning after brain injury显示文摘Hyperbaric oxygen therapy has been widely applied and recognized in the treatment of brain injury;however,the correlation between the protective effect of hyperbaric oxygen therapy and changes of metabolites in the brain remains unclear.To investigate the effect and potential mechanism of hyperbaric oxygen therapy on cognitive functioning in rats,we established traumatic brain injury models using Feeney’s free falling method.We treated rat models with hyperbaric oxygen therapy at 0.2 MPa for 60 minutes per day.The Morris water maze test for spatial navigation showed that the average escape latency was significantly prolonged and cognitive function decreased in rats with brain injury.After treatment with hyperbaric oxygen therapy for 1 and 2 weeks,the rats’spatial learning and memory abilities were improved.Hydrogen proton magnetic resonance spectroscopy analysis showed that the N-acetylaspartate/creatine ratio in the hippocampal CA3 region was significantly increased at 1 week,and the N-acetylaspartate/choline ratio was significantly increased at2 weeks after hyperbaric oxygen therapy.Nissl staining and immunohistochemical staining showed that the number of nerve cells and Nissl bodies in the hippocampal CA3 region was significantly increased,and glial fibrillary acidic protein positive cells were decreased after a 2-week hyperbaric oxygen therapy treatment.Our findings indicate that hyperbaric oxygen therapy significantly improves cognitive functioning in rats with traumatic brain injury,and the potential mechanism is mediated by metabolic changes and nerve cell restoration in the hippocampal CA3 region.Su Liu Guangyu Shen Shukun Deng Xiubin Wang Qinfeng Wu Aisong Guo 2013Neural Regeneration Research2013,8,35:16
4High-speed colour-converting photodetector with all-inorganic CsPbBr_(3) perovskite nanocrystals for ultraviolet light communication显示文摘Optical wireless communication(OWC)using the ultra-broad spectrum of the visible-to-ultraviolet(UV)wavelength region remains a vital field of research for mitigating the saturated bandwidth of radio-frequency(RF)communication.However,the lack of an efficient UV photodetection methodology hinders the development of UV-based communication.The key technological impediment is related to the low UV-photon absorption in existing silicon photodetectors,which offer low-cost and mature platforms.To address this technology gap,we report a hybrid Sibased photodetection scheme by incorporating CsPbBr_(3) perovskite nanocrystals(NCs)with a high photoluminescence quantum yield(PLQY)and a fast photoluminescence(PL)decay time as a UV-to-visible colourconverting layer for high-speed solar-blind UV communication.The facile formation of drop-cast CsPbBr_(3) perovskite NCs leads to a high PLQY of up to ~73% and strong absorption in the UV region.With the addition of the NC layer,a nearly threefold improvement in the responsivity and an increase of ~25% in the external quantum efficiency(EQE)of the solar-blind region compared to a commercial silicon-based photodetector were observed.Moreover,timeresolved photoluminescence measurements demonstrated a decay time of 4.5 ns under a 372-nm UV excitation source,thus elucidating the potential of this layer as a fast colour-converting layer.A high data rate of up to 34 Mbps in solar-blind communication was achieved using the hybrid CsPbBr_(3)-silicon photodetection scheme in conjunction with a 278-nm UVC light-emitting diode(LED).These findings demonstrate the feasibility of an integrated high-speed photoreceiver design of a composition-tuneable perovskite-based phosphor and a low-cost silicon-based photodetector for UV communication.Chun Hong Kang Ibrahim Dursun Guangyu Liu Lutfan Sinatra Xiaobin Sun Meiwei Kong Jun Pan Partha Maity Ee-Ning Ooi Tien Khee Ng Omar F.Mohammed Osman M.Bakr Boon S.Ooi 2019Light(Science & Applications)2019,8,1:14
5Comparative study on the effects and efficiencies of three sublimation drying methods for mushrooms显示文摘Freeze drying(FD)yields the best quality of dried mushrooms but needs long drying time and higher cost.Air drying(AD)gives relatively poor product quality.In order to achieve faster drying along with high product quality,microwave freeze drying(MFD)and atmospheric freeze drying(AFD)were developed to dry mushrooms.By comparison of three sublimation drying processes,it was concluded that FD could lead to the best product quality,but cost the highest energy consumption.AFD mushrooms had the worst quality and longest drying time,but the lowest energy consumption.Compared with FD and AFD,MFD could get relatively acceptable quality and drying efficiency.As a result,MFD can be used to replace traditional FD,and AFD also should be popularized because of its low energy consumption.Duan Xu Liu Wei Ren Guangyue Liu Wenchao Liu Yunhong 2015International Journal of Agricultural and Biological Engineering2015,8,1:13
6An effective route to improve the catalytic performance of SAPO-34 in the methanol-to-olefin reaction显示文摘An effective route to improve the catalytic performance of SAPO-34 in the methanol-to-olefin reaction by simple oxalic acid treatment was investigated.The samples were characterized by XRD,SEM,N2 adsorption-desorption,XRF,TG,29Si MAS NMR and NH3-TPD techniques.The results indicated that the external surface acidity of SAPO-34 was finely tuned by oxalic acid treatment,and the selectivity to C2H4 on SAPO-34 and the catalyst lifetime in the methanol-to-olefin reaction were greatly improved.Guangyu Liu Peng Tian Qinhua Xia Zhongmin Liu 2012Journal of Natural Gas Chemistry2012,21,4:11
7Multifunctional lymph-targeted platform based Mn@mSiO2 nanocomposites: Combining PFOB dual-mode imaging and DOX for cancer diagnose treatment on for and显示文摘Tian Liu Guangyu Wu Jiejun Cheng Qing Lu Yanjie Yao Zhenjing Liu Dongchen Zhu Juan Zhou Jianrong Xu Jun Zhu Dannong He 2016Nano Research2016,9,2:11
8Sintilimab versus docetaxel as second-line treatment in advanced or metastatic squamous non-small-cell lung cancer:an open-label,randomized controlled phase 3 trial(ORIENT-3)显示文摘Background:Treatment options for Chinese patients with locally advanced or metastatic squamous-cell non-small-cell lung cancer(sqNSCLC)after failure of first-line chemotherapy are limited.This study(ORIENT-3)aimed to evaluate the efficacy and safety of sintilimab versus docetaxel as second-line treatment in patients with locally advanced or metastatic sqNSCLC.Methods:ORIENT-3 was an open-label,multicenter,randomized controlled phase 3 trial that recruited patients with stage IIIB/IIIC/IV sqNSCLC after failure with first-line platinum-based chemotherapy.Patients were randomized in a 1:1 ratio to receive either 200 mg of sintilimab or 75 mg/m^(2) of docetaxel intravenously every 3 weeks,stratified by the Eastern Cooperative Oncology Group performance status.The primary endpoint was overall survival(OS)in the full analysis set(FAS).Secondary endpoints included progression-free survival(PFS),objective response rate(ORR),disease control rate(DCR),duration of response(DoR)and safety.Results:Between August 25,2017,and November 7,2018,290 patients were randomized.For FAS,10 patients fromthe docetaxel armwere excluded.Themedian OS was 11.79(n=145;95%confidence interval[CI],10.28-15.57)months with sintilimab versus 8.25(n=135;95%CI,6.47-9.82)months with docetaxel(hazard ratio[HR]:0.74;95%CI,0.56-0.96;P=0.025).Sintilimab treatment significantly prolonged PFS(median 4.30 vs.2.79 months;HR:0.52;95%CI,0.39-0.68;P<0.001)and showed higher ORR(25.50%vs.2.20%,P<0.001)and DCR(65.50%vs.37.80%,P<0.001)than the docetaxel arm.The median DoRwas 12.45(95%CI,4.86-25.33)months in the sintilimab arm and 4.14(95%CI,1.41-7.23)months in the docetaxel arm(P=0.045).Treatment-related adverse events of grade≥3were reported in 26(18.1%)patients in the sintilimab arm and 47(36.2%)patients in the docetaxel arm.Exploratory biomarker analysis showed potential predictive values of expression levels of two transcription factors,including OVOL2(HR:0.35;P<0.001)and CTCF(HR:3.50;P<0.001),for sintilimab treatment.Conclusions:Compared with docetaxel,sintilimab significantly improved the OS,PFS,and ORR of Chinese patients with previously treated locally advanced or metastatic sqNSCLC.Yuankai Shi Lin Wu Xinmin Yu Puyuan Xing Yan Wang Jianying Zhou Airong Wang Jianhua Shi Yi Hu Ziping Wang Guangyu An Yong Fang Sanyuan Sun Caicun Zhou Changli Wang Feng Ye Xingya Li Junye Wang Mengzhao Wang Yunpeng Liu Yanqiu Zhao Ying Yuan Jifeng Feng Zhendong Chen Jindong Shi Tao Sun Gang Wu Yongqian Shu Qisen Guo Yi Zhang Yong Song Shucai Zhang Yuan Chen Wei Li Hongrui Niu Wenwei Hu Lijun Wang Jianan Huang Yang Zhang Ying Cheng Zhengdong Wu Bo Peng Jiya Sun Christoph Mancao Yanqi Wang Luyao Sun 2022Cancer Communications2022,42,12:8
9Research on the Effect Evaluation of Protected Space Driving New Technologies Industrialization from the Perspective of ST显示文摘Based on the perspective of sustainability transitions(ST)theory,the paper dissects the opera-tional mechanisms of protected space driving emerging technology industrialization from an external system perspective,which is on the basis of defining essential characteristics and func-tional attributes of protected space.Meanwhile,it structures a three-dimensional evaluation model of protected space from the perspective of internal mechanism by introducing the policy mixes method.Finally,taking the Chinese New Energy Vehicle(NEV)industry as the example and using the system dynamics modeling method,the paper designs different simulation schemes from three dimensions of horizontal evolution trend,three types of policy instrument change and policy mixes of protected space,to predict and analyze the operation effect of protected space.The results show that the Chinese NEV industry is in the stage of market niche entry,and corresponding measures should be taken to increase the market scale,form effective demand and scale effect,and promote the diffusion of market niche;the effect of policy mixes is better than that of the single policy instrument;specific policy mixes should be adopted to develop simultaneously from both the supply and demand sides to improve the industrialization level of NEV.LIU Yixin OU Chunyao ZHANG Guangyu LIANG Xiao 2020Journal of Systems Science & Complexity2020,33,2:8
10Stable isotope labelled mass spectrometry for quantification of the relative abundances for expressed proteins induced by PeaT1显示文摘The protein elicitor from the mycelium of Alternaria tenuissima has been isolated.The elicitor triggered resistance to the tobacco mosaic virus in tobacco by inducing relative oxygen species,but without causing hypersensitive necrosis.The elicitor is reported to impart resistance against Verticillium dahliae and to increase yield in cotton,but its mechanism is not yet clear.In this study,the stable isotope labelled mass spectrometry method was used to quantify the relative abundances of protein expression induced by PeaT1 in Arabidopsis.A significant difference in the relative abundances for the expression of different proteins related to metabolism,modification,regulatory,defense,stress and antioxidation was found in Arabidopsis.LI GuangYue,YANG XiuFen,ZENG HongMei,MAO JianJun,LIU Hua,ZHANG YunHua & QIU DeWen* Key Laboratory for Biological Control of the Ministry of Agriculture,Institute of Plant Protection,Chinese Academy of Agricultural Sciences,Beijing 100081,China 2010Science China(Life Sciences)2010,53,12:7
11Drying characteristics and mathematical model of ultrasound assisted hot-air drying of carrots显示文摘In order to improve the heat and mass transfer process in hot-air drying,power ultrasound was coupled directly to hot-air drying of fresh carrot slices.The effects of ultrasonic power,radiation distance,hot air velocity and temperature on drying characteristics were studied.In addition,the Page equation was used to fit the ultrasound assisted hot-air drying process of the carrot slices.The results showed that the drying rate of carrot slices increased with the increase of ultrasound power and the decrease of radiation distance.Power ultrasound had a greater enhancement on hot-air drying at lower air velocity(0.5 m/s)and temperature(40ºC),especially at the middle and later periods(controlled by internal diffusion).The drying time of carrot slices using ultrasound assisted hot-air drying was shortened by 37.5%compared to that using hot-air drying at the condition with power of 150 W,radiation distance of 15 cm,air velocity of 1.0 m/s and temperature of 40ºC.All test indicators of the model meet the accuracy requirements,which show that the model can better fit the experimental values.Luo Denglin Liu Juan Liu Yuhong Ren Guangyue 2015International Journal of Agricultural and Biological Engineering2015,8,4:6
12A draft sequence of the rice (Oryza sativa ssp. indica) genome显示文摘The sequence of the rice genome holds fundamental information for its biology, including physiology, genetics, development, and evolution, as well as information on many beneficial phenotypes of economic significance. Using a 'whole genome shotgun' approach, we have pro-duced a draft rice genome sequence of Oryza sativa ssp. in-dica, the major crop rice subspecies in China and many other regions of Asia. The draft genome sequence is constructed from over 4.3 million successful sequencing traces with an accumulative total length of 2214.9 Mb. The initial assembly of the non-redundant sequences reached 409.76 Mb in length, based on 3.30 million successful sequencing traces with a total length of 1797.4 Mb from an indica variant cultivar 93-11, giving an estimated coverage of 95.29% of the rice genome with an average base accuracy of higher than 99%. The coverage of the draft sequence, the randomness of the sequence distribution, and the consistency of BIG-ASSEM-BLER, a custom-designed software packageYU Jun, HU Songnian, WANG Jun,LI Songgang WONG Ka-Shu Gane, LIU Bin,DENG Yajun, DAI Li, ZHOU Yan,ZHANG Xiuqing, CAO Mengliang, LIU Jing,SUN Jiandong , TANG Jiabin, CHEN Yanjiong,HUANG Xiaobing, LIN Wei, YE Chen, TONG Wei,CONG Lijuan, GENG Jianing, HAN Yujun, LI Lin,LI Wei, HU Guangqiang, HUANG Xiangang,LI Wenjie, LI Jian, LIU Zhanwei, LI Long,LIU Jianping, Ql Qiuhui, LIU Jinsong, LI Li,WANG Xuegang, LU Hong, WU Tingling,ZHU Miao, Nl Peixiang, HAN Hua, DONG Wei,REN Xiaoyu, FENG Xiaoli, GUI Peng,LI Xianran, WANG Hao, XU Xin, ZHAI Wenxue,XU Zhao, ZHANG Jinsong, HE Sijie,ZHANG Jianguo, XU Jichen, ZHANG Kunlin,ZHENG Xianwu, DONG Jianhai, ZENG Wanyong,TAO Lin, CHEN Xuewei, HE Jun, LIU Daofeng,TIAN Wei, TIAN Chaoguang, XIA Hongai,LI Gang, GAO Hui, LI Ping, CHEN Wei ,WANG Xudong, ZHANG Yong, HU Jianfei,WANG Jing, LIU Song, YANG Jian,ZHANG Guangyu, XIONG Yuqing, LI Zhijie,MAO Long, ZHOU Chengshu, ZHU Zhen,CHEN Runsheng, HAO Bailin,ZHENG Weimou, CHEN Shouyi, QUO Wei,LI Guojie, LIU Siqi, HUANG Guyang,TAO Ming, WANG Jian, ZHU Lihuang,YUAN Longping& YANG HuanmingBeijing Genomics Institute/Center of Genomics & Bioinformatics, Chinese Academy of Sciences, Beijing 101300, China Hangzhou Genomics Institute/Institute of Bioinformatics of Zhejiang University/Key Laboratory of Bioinformatics of Zhejiang Province, Hangzhou 310007, China Institute of Genetics, Chinese Academy of Sciences, Beijing 100101, China National Hybrid Rice R & D Center, Changsha 410125, China Laboratory of Bioinformatics, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China College of Life Sciences, Peking University, Beijing 100871, China Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 1Q0080, China Digital China Ltd., Beijing 100080, China Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100080, China Medical College, Xi’an Jiaotong University, Xi’an 710061, ChinaThese authors contributed equally to this work.Corresponding author.Corresponden 2001Chinese Science Bulletin2001,46,23:6
13Statistical and frequency analysis of the pressure fluctuation in a fluidized bed of non-spherical particles显示文摘In this paper,the pressure fluctuation in a fluidized bed was measured and processed via standard deviation and power spectrum analysis to investigate the dynamic behavior of the transition from the bubbling to turbulent regime.Two types[Geldart B and D) of non-spherical particles,screened from real bed materials,and their mixture were used as the bed materials.The experiments were conducted in a semiindustrial testing apparatus.The experimental results indicated that the fluidization characteristics of the non-spherical Geldart D particles differed from that of the spherical particles at gas velocities beyond the transition velocity U_c.The standard deviation of the pressure fluctuation measured in the bed increased with the gas velocity,while that measured in the plenum remained constant.Compared to the coarse particles,the fine particles exerted a stronger influence on the dynamic behavior of the fluidized bed and promoted the fluidization regime transition from bubbling toward turbulent.The power spectrum of the pressure fluctuation was calculated using the auto-regressive(AR) model;the hydrodynamics of the fluidized bed were characterized by the major frequency of the power spectrum of the pressure fluctuation.By combining the standard deviation analysis,a new method was proposed to determine the transition velocity U_k via the analysis of the change in the major frequency.The first major frequency was observed to vary within the range of 1.5 to 3 Hz.Honghao He Xiaofeng Lu Wei Shuang Quanhai Wang Yinhu Kang Liyun Yan Xuanyu Ji Guangyu Luo Hai Liu 2014Particuology2014,12,5:6
14Microstructure, Microsegregation, and Mechanical Properties of Directional Solidified Mg–3.0Nd–1.5Gd Alloy显示文摘The microstructure, microsegregation, and mechanical properties of directional solidified Mg–3.0Nd–1.5Gd ternary alloys were experimentally studied. Experimental results showed that the solidification microstructure was composed of dendrite primary a(Mg) phase and interdendritic a(Mg) ? Mg12(Nd, Gd) eutectic and Mg5 Gd phase. The primary dendrite arm spacing k1 and secondary dendrite arm spacing k2 were found to be depended on the cooling rate R in the form k1= 8.0415 9 10-6R-0.279 and k2= 6.8883 9 10-6R-0.205, respectively, under the constant temperature gradient of40 K/mm and in the region of cooling rates from 0.4 to 4 K/s. The concentration profiles of Nd and Gd elements calculated by Scheil model were found to be deviated from the ones measured by EPMA to varying degrees, due to ignorance of the back diffusion of the solutes Nd and Gd within a(Mg) matrix. And microsegregation of Gd depended more on the growth rate, compared with Nd microsegregation. The directionally solidified experimental alloy exhibited higher strength than the non-directionally solidified alloy, and the tensile strength of the directionally solidified experimental alloy was improved,while the corresponding elongation decreased with the increase of growth rate.Shaojun Liu Guangyu Yang Wanqi Jie 2014Acta Metallurgica Sinica(English Letters)2014,27,6:6
15Quantitative and Functional Phosphoproteomic Analysis Reveals that Ethylene Regulates Water Transport via the C-Terminal Phosphorylation of Aquaporin PIP2;1 in Arabidopsis显示文摘乙烯参予众多的细胞的事件和生物过程的规定,包括水损失,在枯萎的叶和花花瓣期间。多样的乙烯回答可以经由在蛋白质 phosphorylation/dephosphorylation 和 ubiquitin/26S 之间的动态相互影响被调整调停 proteasome 的蛋白质降级和朊酶劈开。探讨乙烯怎么通过叉形得多的发信号的小径改变蛋白质 phosphorylation,我们执行了 15 N 稳定的同位素对待空气、对待乙烯的乙烯感觉迟钝的 Arabidopsis 双 loss-of-function 异种 ein3-1/eil1-1 上的基于标签、微分、量的 phosphoproteomics 学习。识别的 Among535 非冗余的 phosphopeptides,二和四 phosphopeptides 起来 -- 并且由乙烯的 downregulated 分别地。aquaporin PIP2 的调整乙烯的 phosphorylation; 1 断然在叶与水流动率和水损失被相关。在有量的 proteomics 的联合的基因研究, immunoblot 分析,原物胀大/缩小实验,并且长叶表示两个的转基因的植物上的水损失试金野类型并且 S280A/S283A-mutated PIP2 ; 1 在里面 Col-0 和 ein3eil1 乙烯增加浇的基因 backgroundssuggest 在由在 PIP2 的 C 终点提高 S280/S283 phosphorylation 的 Arabidopsis 房间的运输率; 1 。未知 kinase 或磷酸酶活动可以参予 EIN3/EIL1 的细胞的功能的起始的起来规定独立人士。这发现贡献我们理解那通常在植物器官的收获以后的存储期间被观察调整乙烯的叶枯萎。Dongjin Qing Zhu Yang Mingzhe Li Wai Shing Wong Guangyu Guo Shichang Liu Hongwei Guo Ning Li 2016Molecular Plant2016,9,1:6
16Effects of freeze-drying and spray drying processes on functional properties of phosphorylation of egg white protein显示文摘Egg white protein(EWP)was phosphorylated with Sodium Tripolyphosphate(STP)at pH 4.5.Freeze drying and spray drying were used for drying purpose and the effects of these drying methods on the functional properties were investigated.The functional properties of native and modified proteins were also determined.The results demonstrated that phosphorylation of EWP markedly improved its functional properties,and that it was more effective for the food industry.The freeze-dried STP-EWP powders were superior in terms of solubility,emulsion stability,water holding capacity,oil and water absorption capacity and heat gel strength than spray-dried STP-EWP powders.The results in viscosity showed no significant differences between freeze-dried and spray dried.The spray-dried powders were better in terms of foaming ability and foam stability than freeze-dried powders.However,the spray drying required the longest time to produce.Freeze drying was found to be the best method in terms of production of modified EWP powders with superior functional properties.Liu Lili Wang Huan Ren Guangyue Duan Xu Li Dan Yin Guangjun 2015International Journal of Agricultural and Biological Engineering2015,8,4:6
17Mapping and validation of a dominant salt tolerance gene in the cultivated soybean(Glycine max) variety Tiefeng 8显示文摘Salt is an abiotic stress factor that strongly affects soybean growth and production. A single dominant gene has been shown to confer salt tolerance in the soybean cultivar Tiefeng 8.The objective of the present study was to genetically map the salt-tolerance gene in an F2:3population and a recombinant inbred line(RIL) population derived from a cross between two cultivated soybeans, Tiefeng 8(tolerant) and 85-140(sensitive). The F2:3families and RILs were treated with 200 mmol L-1Na Cl to evaluate salt tolerance. The F2:3population showed 1(42 tolerant): 2(132 segregating): 1(65 sensitive) segregation, indicating a single dominant gene for salt tolerance in Tiefeng 8. A sequence-characterized amplified region(SCAR) marker from a previously identified random amplified polymorphic DNA(RAPD)marker and four insertion/deletion polymorphism(In Del) markers were developed within the mapping region. Using these markers along with SSR markers, the salt-tolerance gene was mapped within 209 kb flanked by SCAR marker QS08064 and SSR marker Barcsoyssr_3_1301 on chromosome 3. Three markers that cosegregated with the salt tolerance gene and SCAR marker QS08064 were used to genotype 35 tolerant and 23 sensitive soybean accessions. These markers showed selection efficiencies of 76.2% to94.2%. The results indicate that these markers will be useful for marker-assisted breeding and facilitating map-based cloning of the salt tolerance gene in soybean.Rongxia Guan Jiangang Chen Jinghan Jiang Guangyu Liu Ying Liu Lei Tian Lili Yu Ruzhen Chang Li-juan Qiu 2014The Crop Journal2014,2,6:5
18Study on the spectral response of Brassica Campestris L. leaf to the copper pollution显示文摘Brassica Campestis L. was cultivated in the soil at the laboratory. The red edge,the visual spectrum and the near-infrared spectrum of Brassica Campestis L. leaf were used to explore the spectral response of Brassica Campestis L. leaf to the copper stress. As the Cu content in the soil gets increased,the copper level in Brassica Campestris L. leaf would be increased,and the chlorophyll level in Brassica Campestris L. leaf would be decreased. As a result,the visual spectral reflectance (A1) of Brassica Campestris L. leaf is increased,and the blue-shift (moving towards the shorter waveband) degree (S) of the red edge (the ascending region of the re-flectivity at 680―740 nm) gets increased. However,the near-infrared spectral re-flectance (A2) decreases. With the correlation coefficient R2 more than 0.95,these parameters of A1,A2 and S can be perfectly used to simulate and predict the copper level in Brassica Campestris L. leaf.LIU SuHong LIU XinHui HOU Juan CHI GuangYu CUI BaoShan 2008Science China(Technological Sciences)2008,51,2:5
19Tomography system for measurement of gas properties in combustion flow field显示文摘This paper describes a self-designed fiber-coupled tomography system and its application in combustion diagnostics. The tomographic technique, which combines tunable diode laser spectroscopy and algebraic reconstruction technique, enables the simultaneous reconstruction of temperature and gas concentration with both spatial and temporal resolutions. The system measures a maximum diameter of 35 cm in a circular area with a minimum spatial resolution of 1 mm×1 mm and temporal response of up to 1 kHz. Simulations validate the effects of the beam arrangement and discrete grid on reconstruction accuracy, and give the optimal beam arrangements. Experiments are made to demonstrate the tomography method, and systems are constructed in laboratory and on engineering test benches.Junling SONG Yanji HONG Mingyuan XIN Guangyu WANG Zhaoran LIU 2017Chinese Journal of Aeronautics2017,30,5:4
20Design and optimization of DBR in 980 nm bottom-emitting VCSEL显示文摘According to the theory of DBR,with the P-type DBR as an example,the electrical characteristics and optical reflection of the DBR are analyzed by studying the energy band structure with various graded region widths and doping densities. The width and doping density of graded region are decided through a comparative study. The P-type DBR of 980 nm VCSELs is designed with Al0.9Ga0.1As and Al0.1Ga0.9As selected as the high and low refractive index material for the DBR. The 980 nm bottom VCSELs,which consists of 30 pairs P-type DBR and 28 pairs N-type DBR,are then fabricated. In P-type DBR,the width of graded region is 0.02 μm and the uniformity doping concentration is 2.5×1018cm-3. Its reflectivity is 99.9%. In N-type DBR,the width of graded region is also 0.02 μm and the uniformity doping concen-tration is 2×1018cm-3. Its reflectivity is 99.3%. The I-V curve shows that the series resistance of the device is about 0.05 Ω. According to the theory of DBR,with the P-type DBR as an example,the electri-cal characteristics and optical reflection of the DBR are analyzed by studying the energy band structure with various graded region widths and doping densities. The width and doping density of graded re-gion are decided through a comparative study. The P-type DBR of 980 nm VCSELs is designed,with Al0.9Ga0.1As and Al0.1Ga0.9As selected as the high and low refractive index material for the DBR. The 980 nm bottom VCSELs,which consist of 30 pairs P-type DBR and 28 pairs N-type DBR,are then fabri-cated. In P-type DBR,the width of graded region is 0.02 μm and the uniformity doping concentration is 2.5×1018cm-3. Its reflectivity is 99.9%. In N-type DBR,the width of graded region is also 0.02 μm and the uniformity doping concentration is 2×1018cm-3. Its reflectivity is 99.3%. The I-V curve shows that the series resistance of the device is about 0.05 Ω.LI Te NING YongQiang HAO ErJuan CUI JinJiang ZHANG Yan LIU GuangYu QIN Li LIU Yun WANG LiJun CUI DaFu XU ZuYan 2009Science in China(Series F)2009,52,7:4
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