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| 1 | Cold-chain food contamination as the possible origin of COVID-19 resurgence in Beijing显示文摘COVID-19,caused by SARS-CoV-2[1,2],has been contained in China through stringent non-pharmaceutical interventions.Border control and quarantine have effectively prevented the virus from being spread by infected travellers,but the risk of resurgence caused by other routes of introduction and transmission remains unclear,and current strategies to prevent resurgence could be flawed.Since July,SARS-CoV-2 RNA contaminations in frozen food imported from countries with ongoing epidemics have been reported in nine provinces in China[3,4].However,there is no robust evidence of COVID-19 outbreaks initiated by environmentto-human transmission.Here we add to evidence of such transmission by investigating the recent COVID-19 resurgence in Beijing. | Xinghuo Pang Lili Ren Shuangsheng Wu Wentai Ma Jian Yang Lin Di Jie Li Yan Xiao Lu Kang Shichang Du Jing Du Jing Wang Gang Li Shuguang Zhai Lijuan Chen Wenxiong Zhou Shengjie Lai Lei Gao Yang Pan Quanyi Wang Mingkun Li Jianbin Wang Yanyi Huang Jianwei Wang COVID-19 Field Response Group COVID-19 Laboratory Testing Group | 2020 | National Science Review2020，7，12： | 51 |
| 2 | Genome-Wide Prediction of Highly Specific Guide RNA Spacers for CRISPR-Cas9-Mediated Genome Editing in Model Plants and Major Crops显示文摘Dear Editor, RNA-guided genome editing (RGE) using the Streptococcus pyogenes CRISPR-Cas9 system (Jinek et al.,2012;Cong et al.,2013;Mali et al.,2013b) is emerging as a simple and highly efficient tool for genome editing in many organisms.The Cas9 nuclease can be programmed by dual or single guide RNA (gRNA) to cut target DNA at specific sites,thereby introducing precise mutations by error-prone non-homologousend-joining repairing or by incorporating foreign DNAs via homologous recombination between target site and donor DNA.The gRNA-Cas9 complex recognizes targets based on the complementarity between one strand of targeted DNA (referred as protospacer) and the 5'-end leading sequence of gRNA (referred to as gRNA spacer) that is approximately 20 base pairs (bp) long (Figure 1A).Besides gRNA-DNA pairing,a protospacer-adjacent motif (PAM) following the paired region in the DNA is also required for Cas9 cleavage.Recent studies reveal that Cas9 could cut the PAM-containing DNA sites that imperfectly match gRNA spacer sequences,resulting in genome editing at undesired positions. | Kabin Xie Jianwei Zhang Yinong Yang | 2014 | Molecular Plant2014，7，5： | 35 |
| 3 | Efficacy and safety of a novel anti-HER2 therapeutic antibody RC48 in patients with HER2-overexpressing,locally advanced or metastatic gastric or gastroesophageal junction cancer:a single-arm phase II study显示文摘Background:Current treatment options for human epidermal growth factor receptor 2(HER2)-overexpressing gastric cancer at third-line have shown limited clinical benefit.Further,there is no specific treatment for HER2 immunohistochemistry(IHC)2+and fluorescence in-situ hybridization-negative patients.Here,we report the efficacy and safety of a novel anti-HER2 antibody RC48 for patients with HER2-overexpressing,advanced gastric or gastroesophageal junction cancer.Methods:Patients with HER2-overexpressing(IHC 2+or 3+),locally advanced or metastatic gastric or gastroesophageal junction cancer who were under at least second-line therapy were eligible and received RC482.5 mg/kg alone every 2 weeks.The primary endpoint was the objective response rate(ORR)assessed by an independent review committee.Secondary endpoints included progressionfree survival(PFS),overall survival(OS),duration of response,time to progression,disease control rate,and safety.Results:Of 179 patients screened,125 were eligible and received RC48 treatment.The ORR was 24.8%(95%confidence interval[CI]:17.5%-33.3%).The median PFS and OS were 4.1 months(95%CI:3.7-4.9 months)and 7.9 months(95%CI:6.7-9.9 months),respectively.The most frequently reported adverse events were decreased white blood cell count(53.6%),asthenia(53.6%),hair loss(53.6%),decreased neutrophil count(52.0%),anemia(49.6%),and increased aspartate aminotransferase level(43.2%).Serious adverse events(SAEs)occurred in 45(36.0%)patients,and RC48-related SAEs were mainly decreased neutrophil count(3.2%).Seven patients had adverse events that led to death were not RC48-related.Conclusions:RC48 showed promising activity with manageable safety,suggesting potential application in patients with HER2-overexpressing,advanced gastric or gastroesophageal junction cancer who have previously received at least two lines of chemotherapy. | Zhi Peng Tianshu Liu Jia Wei Airong Wang Yifu He Liuzhong Yang Xizhi Zhang Nanfeng Fan Suxia Luo Zhen Li Kangsheng Gu Jianwei Lu Jianming Xu Qingxia Fan Ruihua Xu Liangming Zhang Enxiao Li Yuping Sun Guohua Yu Chunmei Bai Yong Liu Jiangzheng Zeng Jieer Ying Xinjun Liang Nong Xu Chao Gao Yongqian Shu Dong Ma Guanghai Dai Shengmian Li Ting Deng Yuehong Cui Jianmin Fang Yi Ba Lin Shen | 2021 | Cancer Communications2021，41，11： | 29 |
| 4 | Fluxes of CH4 and N_2O from soil under a tropical seasonal rain forest in Xishuangbanna, Southwest China显示文摘从在在 Xishuangbanna 的热带季节的雨林下面的土壤的 CH4 和 N2O 流动,西南中国用关上的静态的房间技术和气体色层法方法被测量一年。三个处理被放在学习的地里:(A) 没有崽,有垃圾的(B) ,和有垃圾和幼苗的(C) 。结果证明在我们的学习的土壤是大气的 CH4 的一个水池和大气的 N2O 的来源。从处理 A, B,和 C 的观察吝啬的 CH4 流动是 50.0 ± 4.0, 35.9 ± 2.8, 31.6 ± 2.8 μ g C/(m2 · h ) ,分别地并且在 2003 的计算年度流动分别地是 4.1, 3.1,和 2.9 kgC/hm2。从处理 A, B,和 C 的观察吝啬的 N2O 流动是 30.9 ± 3.1, 28.2 ± 3.5, 50.2 ± 3 .7 μ g N/(m2 · h ) ,分别地并且在 2003 的计算年度流动分别地是 4.1, 3.1,和 2.9 kgC/hm2。从处理 A, B,和 C 的观察吝啬的 N2O 流动是 30.9 ± 3.1, 28.2 ± 3.5, 50.2 ± 3 .7 μ g N/(m2 · h ) ,分别地并且在 2003 的计算年度流动是 2.8, 2.6,和 3.7 kgN/hm 2 分别地。在 CH4 和 N2O 流动的季节变化在所有三个处理之中是重要的。垃圾的存在减少了 CH4 举起在湿季节期间(P < 0.05 ) ,然而并非在干旱期期间。调停幼苗的 N2O 排出物有类似的增加在期间湿并且干旱期,显示幼苗在两个季节增加了 N2O 排放。一种强壮的积极关系为处理 B 和处理 C 为所有三个处理,和在 CH4 流动和土壤温度之间的弱关系在 CH4 流动和土壤潮湿之间存在。N2O 流动为所有三个处理与土壤温度相关。 | YAN Yuping SHA Liqing CAO Min ZHENG Zheng TANG Jianwei WANG Yinghong ZHANG Yiping WANG Rui LIU Guangren WANG Yuesi SUN Yang | 2008 | Journal of Environmental Sciences2008，20，2： | 18 |
| 5 | A fishy odor episode in a north China reservoir: Occurrence, origin, and possible odor causing compounds显示文摘A significant outbreak of fishy odor occurred in a reservoir located in Inner Mongolia, China, in the winter of 2011, and the odor rating, algal density and concentrations of some potential odorous compounds were monitored over a period of two months. The peak odor rating of the fishy odor was 7 according to flavor profile analysis. Among the dominant algal species(two diatom and one chrysophyte species) observed during the survey, the chrysophyte Dinobryon sp. was the most abundant species, with the peak density recorded at 88,520 cells/mL. Seven potential algal metabolites including heptanal, 2,4-heptadienal, 2,4-decadienal, nonanal, 2-octenal, 2,6- nonadienal and hexanal were detected. The principal component analysis result showed that n-hexanal, n-heptanal and 2,4-decadienal, possibly the metabolites of diatoms, and 2,4-heptadienal, possibly the metabolite of Dinobryon sp., might have contributed to the fishy odor episode. This study demonstrated that the fishy odor episode in this reservoir might be caused by the abnormal growth of chrysophytes and diatoms under the ice-cover. | Yunyun Zhao Jianwei Yu Ming Su Wei An Min Yang | 2013 | Journal of Environmental Sciences2013，25，12： | 17 |
| 6 | Determination of N-nitrosodimethylamine in drinking water by UPLC-MS/MS显示文摘The method for detecting N-nitrosodimethylamine(NDMA) in drinking water using ultra performance liquid chromatography(UPLC) coupled with tandem mass spectrometry(MS/MS) was improved by optimizing the clean-up procedure to remove the matrix interference in pretreatment process,and was then applied to a survey of NDMA in both raw and finished water samples from five water treatment plants in South China.The NDMA concentrations ranged from 4.7 to 15.1 ng/L in raw water samples,and from 4.68 to 46.9 ng/L in finished water.The NDMA concentration in raw water was found to be related with nitrite concentration,and during the treatment,the NDMA concentration increased following ozonation but decreased after subsequent activated carbon treatment. | Wanfeng Wang Jianying Hu Jianwei Yu Min Yang | 2010 | Journal of Environmental Sciences2010，22，10： | 16 |
| 7 | Occurrence of odor problems in drinking water of major cities across China显示文摘进在越过中国的主要城市里的 111 喝的水处理植物(DWTP ) 的气味问题的出现的全面调查用两风味侧面分析(FPA ) 和煤气的层析团 spectrometry (GCMS ) 被承担。百分之八十件来源水样品展出了气味问题,描绘了由土 / 霉(41%) 并且沼泽 / 腐败(36%) 气味,当出现率更低时(45%) 在完成的水里。当那从湖和水库展出了更多的 algaeorigin 气味时,来自河的来源水展出了更多的污染起源气味,例如沼泽 / 腐败的气味,例如土 / 霉的气味。在表面来源水样品的 2-methylisoborneol (2-MIB ) 的出现率是 75% ,与包含超过 10 ng 的 2-MIB 集中的 7% | Daolin SUN Jianwei YU Min YANG Wei AN Yunyun ZHAO Ning LU Shengguang YUAN Dongqing ZHANG | 2014 | Frontiers of Environmental Science & Engineering2014，8，3： | 15 |
| 8 | Addition of hydrogen peroxide for the simultaneous control of bromate and odor during advanced drinking water treatment using ozone显示文摘Complete removal of the characteristic septic/swampy odor from Huangpu River source water could only be achieved under an ozone dose as high as 4.0 mg/L in an ozone-biological activated carbon(O3-BAC) process, which would lead to the production of high concentrations of carcinogenic bromate due to the high bromide content. This study investigated the possibility of simultaneous control of bromate and the septic/swampy odor by adding H2O2 prior to the O3-BAC process for the treatment of Huangpu River water. H2O2 addition could reduce the bromate concentration effectively at an H2O2/O3(g/g) ratio of 0.5 or higher. At the same time, the septic/swampy odor removal was enhanced by the addition of H2O2, although optimization of the H2O2/O3 ratio was required for each ozone dose. At an ozone dose of 2.0 mg/L, the odor was removed completely at an H2O2/O3 ratio of 0.5. The results indicated that H2O2 application at a suitable dose could enhance the removal of the septic/swampy odor while suppressing the formation of bromate during ozonation of Huangpu River source water. | Yongjing Wang Jianwei Yu Dong Zhang Min Yang | 2014 | Journal of Environmental Sciences2014，26，3： | 15 |
| 9 | Influence of initial alkalinity on the hydration of steel slag显示文摘The influences of different alkaline conditions on the kinds and morphologies of steel slag's hydration products, Ca(OH)2 content of hydration products, pore structure of hardened paste, non-evaporable water content of hydration products, and strength of steel slag mortar were investigated by changing the initial alkalinity of the hydration condition of steel slag. The results showed that increasing the initial alkalinity of hydration condition can promote the early hydration of steel slag's active components (e.g., C2S, C3S, and C12A7 ), but it has little influence on their late-age hydration degree. The hydration degree of non-active components (e.g., RO phase and Fe3O4 ) of steel slag is very low even under strong alkaline condition with pH value of 13.8. The excitation effect of alkaline condition on the early hydration of steel slag is more obvious with the increase of pH value, but the kinds of steel slag's hydration products are not influenced by changing the alkaline condition. The amount of steel slag's hydration products is limited, so the strength of alkali-activated steel slag mortar is very low though the strong alkaline condition significantly promotes the early hydration of steel slag. Steel slag is not an ideal raw material for alkali-activated cementitious material. | WANG Qiang YANG JianWei YAN PeiYu | 2012 | Science China(Technological Sciences)2012，55，12： | 14 |
| 10 | Decision-Making in Driver-Automation Shared Control:A Review and Perspectives显示文摘Shared control schemes allow a human driver to work with an automated driving agent in driver-vehicle systems while retaining the driver’s abilities to control.The human driver,as an essential agent in the driver-vehicle shared control systems,should be precisely modeled regarding their cognitive processes,control strategies,and decision-making processes.The interactive strategy design between drivers and automated driving agents brings an excellent challenge for human-centric driver assistance systems due to the inherent characteristics of humans.Many open-ended questions arise,such as what proper role of human drivers should act in a shared control scheme?How to make an intelligent decision capable of balancing the benefits of agents in shared control systems?Due to the advent of these attentions and questions,it is desirable to present a survey on the decision making between human drivers and highly automated vehicles,to understand their architectures,human driver modeling,and interaction strategies under the driver-vehicle shared schemes.Finally,we give a further discussion on the key future challenges and opportunities.They are likely to shape new potential research directions. | Wenshuo Wang Xiaoxiang Na Dongpu Cao Jianwei Gong Junqiang Xi Yang Xing Fei-Yue Wang | 2020 | IEEE/CAA Journal of Automatica Sinica2020，7，5： | 14 |
| 11 | Characterization of disinfection byproduct formation potential in 13 source waters in China显示文摘The formation potential of four trihalomethanes (THMFP) and seven haloacetic acids (HAA 7 FP) in 13 source waters taken from four major water basin areas in China was evaluated using the simulated distribution system (SDS) chlorination method.The specific ultraviolet absorbance (SUVA 254:the ratio of UV 254 to dissolved organic carbon (DOC)),which ranged between 0.9 and 5.0 L/(mg·m),showed that the organic compounds in different source waters exhibited different reactivities with chlorine.The HAA 7 FP of source waters ranged from 20 to 448 μg/L and the THMFP ranged from 29 to 259 μg/L.The HAA 7 FP concentrations were higher than the THMFP concentrations in all but one of the samples.Therefore,the risks of haloacetic acids (HAAs) should be of concern in some source waters.TCM (chloroform) and BDCM (bromodichloromethane) were the major THM constituents,while TCAA (trichloroacetic acid) and DCAA (dichloroacetic acid) were the major HAA species.Br-THM (brominated THM species) were much higher than BrHAA (brominated HAA species),and the formation of Br-DBP (Br-THM and Br-HAA) should be of concern when the bromide concentration is over 100 μg/L. | Junzhi Zhang Jianwei Yu Wei An Juan Liu Yongjing Wang Youjun Chen Jia Tai Min Yang | 2011 | Journal of Environmental Sciences2011，23，2： | 13 |
| 12 | Soil respiration in tropical seasonal rain forest in Xishuangbanna, SW China显示文摘With the static opaque chamber and gas chromatography technique, from January 2003 to January 2004 soil respiration was investigated in a tropical seasonal rain forest in Xishuangbanna, SW China. In this study three treatments were applied, each with three replicates: A (bare soil), B (soil+litter), and C (soil+litter+seedling). The results showed that soil respiration varied seasonally, low from December 2003 to February 2004, and high from June to July 2004. The annual average values of CO2 efflux from soil respiration differed among the treatments at 1% level, with the rank of C (14642 mgCO2· m-2. h-1)>B (12807 mgCO2· m-2. h-1)>A (9532 mgCO2· m-2. h-1). Diurnal variation in soil respiration was not apparent due to little diurnal temperate change in Xishuangbanna. There was a parabola relationship between soil respiration and soil moisture at 1% level. Soil respiration rates were higher when soil moisture ranged from 35% to 45%. There was an exponential relationship between soil respiration and soil temperature (at a depth of 5cm in mineral soil) at 1% level. The calculated Q1o values in this study,ranging from 2.03 to 2.36, were very near to those of tropical soil reported. The CO2 efflux in 2003was 5.34 kgCO2· m-2. a-1 from soil plus litter plus seedling, of them 3.48 kgCO2· m-2. a-1 from soil (accounting for 62.5%), 1.19 kgCO2· m-2. a-1 from litter (22.3%) and 0.67 kgCO2·m-2. a-1 from seedling (12.5%). | SHA Liqing, ZHENG Zheng, TANG Jianwei, WANG Yinghong, ZHANG Yiping, CAO Min, WANG Rui, LIU Guangren, WANG Yuesi & SUN Yang Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China Graduate School of Chinese Academy of Sciences, Beijing 100039, China | 2005 | Science China Earth Sciences2005，48，z1： | 12 |
| 13 | Petrogenesis and tectonic implications of Late-Triassic high εNd(t)-εHf(t) granites in the Ailaoshan tectonic zone(SW China)显示文摘High εNd(t)-εHf(t) granites are robust evidence for crustal growth. In this paper we report results of petrologic, geochronological and geochemical investigations on the Huashiban granites from the Ailaoshan tectonic zone in western Yunnan(SW China). Zircon grains separated from the two samples(10HH-119 A and 10HH-120A) yield the weighted mean 206Pb/238 U ages of 229.9 ± 2.0 Ma and 229.3 ± 2.3 Ma, respectively, interpreted as the crystallization ages of the granites. Based on our results, in combination with the existing U-Pb geochronological data for the Ailaoshan metamorphic rocks, we propose that the Ailaoshan Group might be a rock complex composed of the Mesoproterozoic, Neoproterozoic, Hercynian, Indosinian and Himalayan components, rather than a part of the crystalline basement of the Yangtze block. The zircon grains show highly depleted Lu-Hf isotope compositions, with positive εHf(t) values ranging from 8.4 to 13.1. The Huashiban granites have high SiO2(72.66 wt%–73.70 wt%), low Mg#(0.28–0.34) with A/CNK=1.01–1.05, and can be classified as peralumious high-K calc-alkaline I-type granites. A synthesis of these data indicates that the Ailaoshan tectonic zone had evolved into a post-collisional setting by the Late-Triassic(229 Ma). Genesis of the Huashiban high εNd(t)-εHf(t) granites involved into two processes:(1) underplating of the sub-arc mantle into the lower crust, and(2) remelting of the juvenile crustal materials in response to the upwelling of the asthenospheric mantle in the post-collisional setting. | LIU HuiChuan WANG YueJun FAN WeiMing ZI JianWei CAI YongFeng YANG GuangLin | 2014 | Science China Earth Sciences2014，57，9： | 12 |
| 14 | Monodisperse core-shell structured magnetic mesoporous aluminosilicate nanospheres with large dendritic mesochannels显示文摘合理设计和有一个定制的活跃核心和大、树枝状的、修改 mesoporous 的多功能的混合 nanostructures 的精确合成组织了壳能支持催化作用,精力存储,和生物应用。这里,油水双相层化涂层策略被开发了准备 monodisperse 磁性的树枝状的 mesoporous 硅石核心壳结构化的 nanospheres。这些复杂 Fe 3 O 4@SiO2@dendritic-mSiO2 nanospheres 特征大树枝状的开的毛孔(2.7 和 10.3 nm ) 。显著地,硅石壳能与未改变的孔, 14 的 Si/Al 臼齿的比率,和显著地强壮的酸的地点被变换成树枝状的 mesoporous 铝矽酸盐框架,通过一条合成以后的途径。另外,结果的磁性的树枝状的 mesoporous 铝矽酸盐 nanospheres 展览在从废水的磷酸盐移动的突出的性质和有希望的申请。 | Jianping Yang Dengke Shen Yong Wei Wei Li Fan Zhang Biao Kong Shaohua Zhang Wei Teng Jianwei Fan Weixian Zhang Shixue Dou Dongyuan Zhao | 2015 | Nano Research2015，8，8： | 11 |
| 15 | 黔西南卡林型金矿床与区域古油藏的关系:来自流体包裹体气相组成和沥青拉曼光谱特征的证据显示文摘黔西南地区是世界第二大卡林型金矿床集中区,同时也发育有大量古油藏,二者空间关系密切,但是否具有成因联系目前尚不清楚且存在较大争议。本文报道该区典型金矿床与成矿有关的热液矿物中流体包裹体的气相组成和高品位金矿石中沥青的激光拉曼光谱分析结果,以探讨含有机质流体与金成矿作用之间的关系。研究表明,虽然含砷富金黄铁矿、石英、方解石、萤石和雄黄等热液矿物形成于不同的成矿阶段,但其中流体包裹体的有机气相组分种类、含量及相对比例整体较为一致,表明成矿流体中的有机络离子团在成矿作用过程中没有发生明显的分解或重组,进而说明黔西南卡林型金矿成矿作用过程中有机质并未以有机络离子团的形式对金进行有效搬运或其搬运金的能力非常有限。在N2/Ar—CO2/CH4流体来源判别图解中,各蚀变矿物中的流体包裹体气相组成主要落在循环的大气降水区域,经大气水区域向岩浆流体区域延伸,整体上构成一条非常好的线性分布趋势,暗示成矿流体可能起源于深部岩浆但在演化过程中有大量循环大气水的加入。水银洞金矿床的1件石英样品偏离上述趋势线并向有机流体方向偏移,可能反映了流体迁移过程中有机质的加入。该区金矿床的矿石中均不同程度地发育浸染状沥青,不同矿床中沥青的激光拉曼光谱特征基本一致,说明该区金矿床中的沥青具有相同成因。根据沥青激光拉曼光谱特征地质温度计反演计算的成矿早阶段流体温度为317~336℃,明显高于区域古地温温度(160~250℃)以及区域古油藏的流体包裹体均一温度(73~175℃),说明该区卡林型金矿床的成矿热源与区域古地温无关。对区域地质及近年来地球物理与地球化学最新成果的综合分析表明,该区卡林型金矿床可能是叠加在区域古地温场之上的深部岩浆活动远端低温热液成矿作用的产物,与金矿床空间关系密切的有机质可能为来自先存古油藏并沿控矿构造发生逃逸的油气物质裂解产物,金成矿与区域古油藏之间不存在成因联系。 | 靳晓野 李建威 HOFSTRA Albert MARSH Erin 刘建中 杨梧 JIN XiaoYe LI JianWei LIU JianZhong YANG Wu | 2016 | 岩石学报2016，32，11： | 11 |
| 16 | Characterization and cloning of a brittle culm mutant (bc88) in rice (Oryza sativa L.)显示文摘This study characterizes a brittle culm (bc88) mutant of rice (Oryza sativa L.) obtained by ethylene methylsulfonate (EMS)-induced mutagenesis of Wuyunjing 7. The bc88 mutant exhibits a diversity of pleiotropic phenotypes, including brittle culm at the whole-plant growth stages, withered leaf tips at the seedling stage, and 18-d delay in heading date at the mature stage. Genetic analysis indicates that the bc88 mutant is controlled by a single recessive nuclear gene. The mutated bc88 gene isolated by map-based cloning contains only one point mutation in the 5th exon relative to its wild-type BC88 (LOC_Os09g25490 and Os09g0422500), leading to an amino acid change from P to L in bc88 plants. Alignment of the putative protein sequence with its homologs indicates that the mutation is located in the conserved region of the sequence. Detection of the transcription level of BC88 in rice plants shows that the expression level of BC88 is higher in spikes and culms than in leaves, roots, and leaf sheaths. These contribute to understanding of the molecular mechanism of cellulose synthesis. The target gene BC88 can be a useful tool in molecular marker-assisted selection for rice culm trait breeding. | RAO YuChun YANG YaoLong XIN DeDong LI XiaoJing ZHAI KaiEn MA BoJun PAN JianWei QIAN Qian ZENG DaLi | 2013 | Chinese Science Bulletin2013，58，24： | 11 |
| 17 | Kinetic studies of gas hydrate formation with low-dosage hydrate inhibitors显示文摘Pipeline blockage by gas hydrates is a serious problem in the petroleum industry.Low-dosage inhibitors have been developed for its cost-effective and environmentally acceptable characteristics.In a 1.072-L reactor with methane,ethane and propane gas mixture under the pressure of about 8.5 MPa at 4 °C,hydrate formation was investigated with low-dosage hydrate inhibitors PVP and GHI1,the change of the compressibility factor and gas composition in the gas phase was analyzed,the gas contents in hydrates were compared with PVP and GHI1 added,and the inhibition mechanism of GHI1 was discussed.The results show that PVP and GHI1 could effectively inhibit the growth of gas hydrates but not nucleation.Under the experimental condition with PVP added,methane and ethane occupied the small cavities of the hydrate crystal unit and the ability of ethane entering into hydrate cavities was weaker than that of methane.GHI1 could effectively inhibit molecules which could more readily form hydrates.The ether and hydroxy group of diethylene glycol monobutyl ether have the responsibility for stronger inhibition ability of GHI1 than PVP. | TANG CuiPing 1,2,DAI XingXue 1,2,DU JianWei 1,2,LI DongLiang 1,2,ZANG XiaoYa 1,2,YANG XiangYang 1 & LIANG DeQing 1 1 Guangzhou Institute of Energy Conversion,Key Laboratory of Renewable Energy and Gas Hydrate,Chinese Academy of Sciences,Guangzhou 510640,China 2 Graduate University of the Chinese Academy of Sciences,Beijing 100039,China | 2010 | Science China Chemistry2010，53，12： | 9 |
| 18 | Spatial and temporal variations of two cyanobacteria in the mesotrophic Miyun reservoir, China显示文摘Spatial variations in phytoplankton community within a large mesotrophic reservoir(Miyun reservoir, North China) were investigated in relation to variations in physico-chemical properties, nutrient concentrations, temperature and light conditions over a 5 month period in 2009. The dynamics of phytoplankton community was represented by the dominance of cyanobacteria through summer and fall, following with a short term dominance of chlorophyta in late fall, and a relatively high abundance of diatom in October; on the other hand, maximum phytoplankton biomass was recorded in the north shallow region of Miyun reservoir with a higher nutrients level. Particular attention was paid to the impacts of environmental conditions on the growth of two cyanobacteria genera, the toxin-producing Microcystis and the taste & odor-producing Oscillatoria. Microcystis biomass was in general greatly affected by water temperature and mixing depth/local water depth ratio in this reservoir, while the Oscillatoria biomass in the surface and middle layers was greatly affected by total dissolved phosphorus, and that in the bottom layer was related with the Secchi depth/local water depth ratio. Abundant Oscillatoria biomass was observed only in late September when Microcystis biomass decreased and allowed sufficient light go through. | Ming Su Jianwei Yu Shenling Pan Wei An Min Yang | 2014 | Journal of Environmental Sciences2014，26，2： | 9 |
| 19 | Reconstruction of flood events over the last 150 years in the lower reaches of the Changjiang River显示文摘The reconstruction of paleofloods in the Holocene has become one research highlight for the present global change study.The core sediments from one newly-emerged bar in the lower Changjiang River(Yangtze River)mainstream were collected for grain size and organic elemental measurements,with aim to reconstruct the flood events over the past 150 years.Major grain size parameters such as mean grain size,probability cumulative curve and C-M diagram of the core sediments clearly indicate the flood event deposition.Furthermore,the TOC/TN ratios in the sediments can indicate flood events considering that during the flash floods,strong surface erosion in the upper and lower reaches of the Changjiang River can transport a large amount of undecomposed plant debris and organic components with relatively low C/N ratios into the lower mainstream.Based on 210Pb dating and sedimentary geochemical results,the research profile recorded several large floods happened from 1850 to 1954,which agrees well with the historical documents and hydrological observations.Interesting to note that the flood events since the 1960s cannot be distinctly recognized on the basis of sediment grain size and organic elemental compositions of the profile,which mainly reflects the intensive human activities over the last fifty years,especially condense dam construction,have significantly changed the characters of suspended sediment into the lower mainstream. | ZHAN Wang YANG ShouYe LIU XiaoLi LI JianWei CHOI ManSik | 2010 | Chinese Science Bulletin2010，55，21： | 9 |
| 20 | Advanced oxidation of bromide-containing drinking water: A balance between bromate and trihalomethane formation control显示文摘Addition of H2O2 has been employed to repress bromate formation during ozonation of bromide-containing source water.However,the addition of H2O2 will change the oxidation pathways of organic compounds due to the generation of abundant hydroxyl radicals,which could afect the removal efcacy of trihalomethane precursors via the combination of ozone and biological activated carbon(O3-BAC).In this study,we evaluated the efects of H2O2 addition on bromate formation and trihalomethane formation potential(THMFP)reduction during treatment of bromide-containing(97.6–129.1μg/L)source water by the O3-BAC process.At an ozone dose of 4.2 mg/L,an H2O2/O3(g/g)ratio of over 1.0 was required to maintain the bromate concentration below 10.0μg/L,while a much lower H2O2/O3ratio was sufcient for a lower ozone dose.An H2O2/O3(g/g)ratio below 0.3 should be avoided since the bromate concentration will increase with increasing H2O2 dose below this ratio.However,the addition of H2O2 at an ozone dose of 3.2 mg/L and an H2O2/O3 ratio of 1.0 resulted in a 43% decrease in THMFP removal when compared with the O3-BAC process.The optimum H2O2/O3(g/g) ratio for balancing bromate and trihalomethane control was about 0.7–1.0.Fractionation of organic materials showed that the addition of H2O2 decreased the removal efcacy of the hydrophilic matter fraction of DOC by ozonation and increased the reactivity of the hydrophobic fractions during formation of trihalomethane,which may be the two main reasons responsible for the decrease in THMFP reduction efcacy.Overall,this study clearly demonstrated that it is necessary to balance bromate reduction and THMFP control when adopting an H2O2 addition strategy. | Yongjing Wang Jianwei Yu Po Han Jing Sha Tao Li Wei An Juan Liu Min Yang | 2013 | Journal of Environmental Sciences2013，25，11： | 9 |
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