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1Mapping wetland changes in China between 1978 and 2008显示文摘Four wetland maps for all China have been produced,based on Landsat and CBERS-02B remote sensing data between 1978 and 2008 (1978,1990,2000 and 2008).These maps were mainly developed by manual interpretation and validated by substantial field investigation in 2009.Based on these maps,we analyzed the 2008 wetland distribution in China and discussed wetland changes and their drivers over the past 30 years.(i) There were about 324097 km 2 of wetlands in 2008,for which inland marshes or swamps were the most common wetland type (35%),with lakes (26%) second.Most of the wetlands were in Heilongjiang,Inner Mongolia,Qinghai and Tibet,occupying about 55% of the national wetland area.(ii) From 1978 to 2008,China's wetland area continually and significantly decreased,by about 33% based on changes in the wetland map.This was in sharp contrast to the increase in artificial wetlands,which increased by about 122%.Inland marshes accounted for the main loss of total wetlands from 1978 to 2000.From 2000 through 2008,riverine and lacustrine wetlands constituted the main wetland loss.Fortunately however,the rate of wetland loss decreased from 5523 to 831 km 2 /a.(iii) The change ratio of lost natural wetlands (including inland and coastal wetlands) to non-wetlands has decreased slightly over the past 30 years.From 1978 to 1990,nearly all natural wetlands (98%) lost were transformed into non-wetlands.However,the ratio declined to 86% from 1990 to 2000,and to 77% from 2000 to 2008.(iv) All Chinese provinces were divided into three groups according to patterns of wetland changes,which could relate to the driving forces of such changes.Tibet was completely different from other provinces,as it was one representative example in which there was a net wetland increase,because of global warming and decreased human activity since 1990.Increased economic development caused considerable wetland loss in most eastern provinces,and artificial wetlands increased.NIU ZhenGuo ZHANG HaiYing WANG XianWei YAO WenBo ZHOU DeMin ZHAO KuiYi ZHAO Hui LI NaNa HUANG HuaBing LI CongCong YANG Jun LIU CaiXia LIU Shuang WANG Lin LI Zhan YANG ZhenZhong QIAO Fei ZHENG YaoMin CHEN YanLei SHENG YongWei GAO XiaoHong ZHU WeiHong WANG WenQing WANG Hong WENG YongLing ZHUANG DaFang LIU JiYuan LUO ZhiCai CHENG Xiao GUO ZiQi GONG Peng 2012Chinese Science Bulletin2012,57,22:51
2CFD simulation of particle suspension in a stirred tank显示文摘Particle suspension characteristics are predicted computationally in a stirred tank driven by a Smith turbine.In order to verify the hydrodynamic model and numerical method,the predicted power number and flow pattern are compared with designed values and simulated results from the literature,respectively.The effects of particle density,particle diameter,liquid viscosity and initial solid loading on particle suspension behavior are investigated by using the Eulerian-Eulerian two-fluid model and the standard k-s turbulence model.The results indicate that solid concentration distribution depends on the flow field in the stirred tank.Higher particle density or larger particle size results in less homogenous distribution of solid particles in the tank.Increasing initial solid loading has an adverse impact on the homogeneous suspension of solid particles in a low-viscosity liquid,whilst more uniform particle distribution is found in a high-viscosity liquid.Nana Qi Hu Zhang Kai Zhang Gang Xu Yongping Yang 2013Particuology2013,11,3:19
3Circulating endothelial and progenitor cells:Evidence from acute and long-term exercise effects显示文摘Circulating bone-marrow-derived cells,named endothelial progenitor cells(EPCs),are capable of maintaining,generating,and replacing terminally differentiated cells within their own specific tissue as a consequence of physiological cell turnover or tissue damage due to injury.Endothelium maintenance and restoration of normal endothelial cell function is guaranteed by a complex physiological procedure in which EPCs play a significant role.Decreased number of peripheral blood EPCs has been associated with endothelial dysfunction and high cardiovascular risk.In this review,we initially report current knowledge with regard to the role of EPCs in healthy subjects and the clinical value of EPCs in different disease populations such as arterial hypertension,obstructive sleep-apnea syndrome,obesity,diabetes mellitus,peripheral arterial disease,coronary artery disease,pulmonary hypertension,and heart failure.Recent studies have introduced the novel concept that physical activity,either performed as a single exercise session or performed as part of an exercise training program,results in a significant increase of circulating EPCs.In the second part of this review we provide preliminary evidence from recent studies investigating the effects of acute and long-term exercise in healthy subjects and athletes as well as in disease populations.Matina Koutroumpi Stavros Dimopoulos Katherini Psarra Theodoros Kyprianou Serafim Nanas 2012World Journal of Cardiology2012,4,12:18
4Integrative lipidomic and transcriptomic study unravels the therapeutic effects of saikosaponins A and D on non-alcoholic fatty liver disease显示文摘Nonalcoholic fatty liver disease(NAFLD)has become one of the most prominent causes of chronic liver diseases and malignancies.However,few therapy has been approved.Radix Bupleuri(RB)is the most frequently used herbal medicine for the treatment of liver diseases.In the current study,we aim to systemically evaluate the therapeutic effects of saikosaponin A(SSa)and saikosaponin D(SSd),the major bioactive monomers in RB,against NAFLD and to investigate the underlying mechanisms.Our results demonstrated that both SSa and SSd improved diet-induced NAFLD.Integrative lipidomic and transcriptomic analysis revealed that SSa and SSd modulated glycerolipid metabolism by regulating related genes,like Lipe and Lipg.SSd profoundly suppressed the fatty acid biosynthesis by downregulating Fasn and Acaca expression and promoted fatty acid degradation by inducing Acox1 and Cpt1 a expression.Bioinformatic analysis further predicted the implication of master transcription factors,including peroxisome proliferator-activated receptor alpha(PPARα),in the protective effects of SSa and SSd.These results were further confirmed in vitro in mouse primary hepatocytes.In summary,our study uncoded the complicated mechanisms underlying the promising anti-steatosis activities of saikosaponins(SSs),and provided critical evidence inspiring the discovery of innovative therapies based on SSa and SSd for the treatment of NAFLD and related complications.Xiaojiaoyang Li Junde Ge Yajing Li Yajie Cai Qi Zheng Nana Huang Yiqing Gu Qi Han Yunqian Li Rong Sun Runping Liu 2021Acta Pharmaceutica Sinica B2021,11,11:15
5Effects of IAA and ABA on the Immature Peach Fruit Development Process显示文摘Peach(Prunus persica cv. Dajiubao) was chosen as a model to clarify the roles of IAA and ABA during the fruit ripening process. Seventy days after flowering(DAF), the fruits were treated with IAA and ABA(0.1 mmol·L-1 and 1 mmol·L-1, respectively) and with the IAA transporter inhibitor(NPA) and the ABA biosynthesis inhibitor(NDGA). IAA decreased the fruit ABA concentration, and increased ethylene concentration, leading to fruit(70 DAF) softening and coloration. NPA had the opposite effect. ABA decreased IAA and ethylene concentrations, leading to fruit hardness and lack of color. NDGA had similar effects as with IAA application. A q PCR analysis indicated that in immature fruits, the expression levels of ethylene biosynthesis and signaling genes(PpACS, PpACO, PpETR, PpERF2), anthocyanin biosynthesis genes(PpCHS, PpDFR, PpF3 H, PpUFGT), cell wall softening genes(PpEXP1, PpEXP2, PpPG2, PpPME), and auxin biosynthesis genes(PpPIN, PpTIR1) were upregulated by IAA application but were inhibited by NPA. In contrast, these ripening-related genes were downregulated by ABA application, but upregulated by NDGA. Generally, the immature fruit ripening process requires a high IAA concentration to generate a large amount of ethylene. ABA appeared to modulate ripening through interference not only with ethylene and cell wall related genes but also with auxin-related genes.Nana Liu 2019Horticultural Plant Journal2019,5,4:13
6Effect of music therapy derived from the five elements in Traditional Chinese Medicine on post-stroke depression显示文摘OBJECTIVE: To evaluate the clinical efficacy and safety of five phase music therapy in patients with depression after ischemic stroke.METHODS: A total of 92 patients with post-stroke depression were randomly divided into the control group(32 cases), treatment group A(30 cases), and treatment group B(30 cases). All groups were given basic therapies for cerebral infarction. In addition,the control group was administerd 50 mg of oral sertraline hydrochloride daily, while treatment groups A and B received needling at Baihui(GV 20)plus acupoint injection at Yanglingquan(GB 34) daily; treatment group B also received music therapy derived from the five phases in Traditional ChineseMedicine theory twice daily. All treatments were administered for 5 d per treatment cycle for three cycles, with a 1 d interval between cycles. In all three groups, Hamilton's depression scale(HAMD-17)score and the activities of daily life(ADL) score were measured before and after treatment, and side effects were assessed with the treatment emergent symptom scale.RESULTS: The HAMD-17 score significantly decreased after treatment in all three groups, and the post-treatment reduction in HAMD-17 score was markedly greater in treatment group B than in treatment group A(P < 0.01). The ADL score significantly increased after treatment in all three groups,and the post-treatment increase in ADL score was significantly greater in treatment group B than in treatment group A(P < 0.01). The treatment emergent symptom scale score was highest in the control group, and lowest in group B, and significantly differed between the three groups(P < 0.01).CONCLUSION: Five phase music therapy plus acupoint needling and acupoint injection can improve the symptoms in patients with post-stroke depression.Lin Facai Huang Dehong He Nana Gu Yihuang Wu Yunchuan 2017Journal of Traditional Chinese Medicine2017,37,5:12
7Humoral immune response to circulating SARS-CoV-2 variants elicited by inactivated and RBD-subunit vaccines显示文摘SARS-CoV-2 variants could induce immune escape by mutations on the receptor-binding domain(RBD)and N-terminal domain(NTD).Here we report the humoral immune response to circulating SARS-CoV-2 variants,such as 501Y.V2(B.1.351),of the plasma and neutralizing antibodies(NAbs)elicited by CoronaVac(inactivated vaccine),ZF2001(RBD-subunit vaccine)and natural infection.Among 86 potent NAbs identified by high-throughput single-cell VDJ sequencing of peripheral blood mononuclear cells from vaccinees and convalescents,near half anti-RBD NAbs showed major neutralization reductions against the K417N/E484K/N501Y mutation combination,with E484K being the dominant cause.VH3-53/VH3-66 recurrent antibodies respond differently to RBD variants,and K417N compromises the majority of neutralizing activity through reduced polar contacts with complementarity determining regions.In contrast,the 242–244 deletion(242–244Δ)would abolish most neutralization activity of anti-NTD NAbs by interrupting the conformation of NTD antigenic supersite,indicating a much less diversity of anti-NTD NAbs than anti-RBD NAbs.Plasma of convalescents and CoronaVac vaccinees displayed comparable neutralization reductions against pseudo-and authentic 501Y.V2 variants,mainly caused by E484K/N501Y and 242–244Δ,with the effects being additive.Importantly,RBD-subunit vaccinees exhibit markedly higher tolerance to 501Y.V2 than convalescents,since the elicited anti-RBD NAbs display a high diversity and are unaffected by NTD mutations.Moreover,an extended gap between the third and second doses of ZF2001 leads to better neutralizing activity and tolerance to 501Y.V2 than the standard three-dose administration.Together,these results suggest that the deployment of RBD-vaccines,through a third-dose boost,may be ideal for combating SARS-CoV-2 variants when necessary,especially for those carrying mutations that disrupt the NTD supersite.Yunlong Cao Ayijiang Yisimayi Yali Bai Weijin Huang Xiaofeng Li Zhiying Zhang Tianjiao Yuan Ran An Jing Wang Tianhe Xiao Shuo Du Wenping Ma Liyang Song Yongzheng Li Xiang Li Weiliang Song Jiajing Wu Shuo Liu Xuemei Li Yonghong Zhang Bin Su Xianghua Guo Yangyang Wei Chuanping Gao Nana Zhang Yifei Zhang Yang Dou Xiaoyu Xu Rui Shi Bai Lu Ronghua Jin Yingmin Ma Chengfeng Qin Youchun Wang Yingmei Feng Junyu Xiao Xiaoliang Sunney Xie 2021Cell Research2021,31,7:12
8Piglets cloned from induced pluripotent stem cells显示文摘Nana Fan Jijun Chen Zhouchun Shang Hongwei Dou Guangzhen Ji Qingjian Zou Lu Wu Lixiazi He Fang Wang Kai Liu Na Liu Jianyong Han Qi Zhou Dengke Pan Dongshan Yang Bentian Zhao Zhen Ouyang Zhaoming Liu Yu Zhao Lin Lin Chongming Zhong Quanlei Wang Shouqi Wang Ying Xu Jing Luan Yu Liang Zhenzhen Yang Jing Li Chunxia Lu Gabor Vajta Ziyi Li Hongsheng Ouyang Huayan Wang Yong Wang Yang Yang Zhonghua Liu Hong Wei Zhidong Luan Miguel A Esteban Hongkui Deng Huanming Yang Duanqing Pei Ning Li Gang Pei Lin Liu Yutao Du Lei Xiao Liangxue Lai 2013Cell Research2013,23,1:12
9Rare SNP Identified a TCP Transcription Factor Essential for Tendril Development in Cucumber显示文摘稀罕基因变体充满染色体,但是少些在染色体宽的协会学习易控制。这里,我们利用稀罕变化印射在黄瓜(Cucumis sativus L.) 为卷须开发发现基因必需品的策略。在里面许多 > 3000 根线,我们发现形成的一根唯一的卷须更少线分叉而不是卷须并且因此,失去它的爬的能力。我们假设了那这不平常的显型被一个稀罕变化引起并且随后识别了原因的单个核苷酸多型性。影响基因十编码一个 TCP 抄写因素在葫芦以内保存了并且在卷须明确地被表示,代表新机关身份基因。变化在对葫芦唯一的一个蛋白质主题以内发生并且作为 transcriptional 使活跃之物损害它的功能。从 near-isogenic 线的 transcriptomes 的分析识别了要求让卷须的能力察觉到并且爬支持的下游的基因。这研究提供一个例子在植物染色体探索稀罕功能的变体。Shenhao Wang Xueyong Yang Mengnan Xu Xingzhong Lin Tao Lin Jianjian Qi Guangjin Shao Nana Tian QingYang Zhonghua Zhang Sanwen Huang 2015Molecular Plant2015,8,12:12
10Genetically Modified Pig Models for Human Diseases显示文摘Genetically modified animal models are important for understanding the pathogenesis of human disease and developing therapeutic strategies.Although genetically modified mice have been widely used to model human diseases,some of these mouse models do not replicate important disease symptoms or pathology.Pigs are more similar to humans than mice in anatomy,physiology,and genome. Thus,pigs are considered to be better animal models to mimic some human diseases.This review describes genetically modified pigs that have been used to model various diseases including neurological,cardiovascular,and diabetic disorders.We also discuss the development in gene modification technology that can facilitate the generation of transgenic pig models for human diseases.Nana Fan Liangxue Lai 2013Journal of Genetics and Genomics2013,40,2:11
11Transcriptional analysis and histochemistry reveal that hypersensitive cell death and H2O2 have crucial roles in the resistance of tea plant (Camellia sinensis (L.) O. Kuntze) to anthracnose显示文摘Anthracnose causes severe losses of tea production in China.Although genes and biological processes involved in anthracnose resistance have been reported in other plants,the molecular response to anthracnose in tea plant is unknown.We used the susceptible tea cultivar Longjing 43 and the resistant cultivar Zhongcha 108 as materials and compared transcriptome changes in the leaves of both cultivars following Colletotrichum fructicola inoculation.In all,9015 and 8624 genes were differentially expressed between the resistant and susceptible cultivars and their controls(0 h),respectively.In both cultivars,the differentially expressed genes(DEGs)were enriched in 215 pathways,including responses to sugar metabolism,phytohormones,reactive oxygen species(ROS),biotic stimuli and signalling,transmembrane transporter activity,protease activity and signalling receptor activity,but DEG expression levels were higher in Zhongcha 108 than in Longjing 43.Moreover,functional enrichment analysis of the DEGs showed that hydrogen peroxide(H2O2)metabolism,cell death,secondary metabolism,and carbohydrate metabolism are involved in the defence of Zhongcha 108,and 88 key genes were identified.Protein–protein interaction(PPI)network demonstrated that putative mitogen-activated protein kinase(MAPK)cascades are activated by resistance(R)genes and mediate downstream defence responses.Histochemical analysis subsequently validated the strong hypersensitive response(HR)and H2O2 accumulation that occurred around the hyphal infection sites in Zhongcha 108.Overall,our results indicate that the HR and H2O2 are critical mechanisms in tea plant defence against anthracnose and may be activated by R genes via MAPK cascades.Yuchun Wang Xinyuan Hao Qinhua Lu Lu Wang Wenjun Qian Nana Li Changqing Ding Xinchao Wang Yajun Yang 2018Horticulture Research2018,5,1:11
12A Nonlinear Control Algorithm for Flywheel Energy Storage Systems in Discharging Mode显示文摘针对Buck-Boost变换器的非线性特征给飞轮储能系统的放电运行状态带来的控制问题,提出了电压电流双环非线性控制算法。基于输入/输出线性化理论,推导出电流内环的控制律,并证明了内动态的稳定性。电压外环采用鲁棒性强的滑模变结构控制方法,并增加限流环节,保证放电电路安全、稳定运行。在Matlab/Simulink仿真平台中搭建飞轮放电模型,对所提出非线性控制算法进行了仿真验证。仿真结果表明,相比于双环PI控制,该算法能够明显改善输出电压调节时间、超调量等动态特性,在输入电压存在大范围变化的情况下,输出电压能够保持恒定和较低的纹波系数。WANG Nana Li Yongli ZHANG Weiya CHANG Xiaoyong XUE Wei 2013中国电机工程学报2013,33,19:11
13DBU-GAC型CO2吸附剂性能研究显示文摘为了实现烟气CO2的低成本、高效捕集,研究负载1,8-二氮杂二环[5,4,0]十一碳-7-烯(1,8-diazabicyclo[5,4,0]undec-7-ene,DBU)的颗粒活性炭(granular activated carbon,GAC)吸附剂对CO2捕集性能。DBU负载率越高,吸附剂比表面积、总孔容积和微孔容积越小,平均孔径与负载率呈明显的负相关性;Langmuir模型是拟合DBU在GAC上吸附行为拟合优度最佳的模型,DBU在GAC上单分子层吸附要多于多分子层吸附;DBU-GAC吸附剂在低于140℃时具有良好的热稳定性,DBU能抑制吸附剂水分蒸发,有利于DBU与CO2耗水反应;DBU溶液对CO2具有很高的捕集效率,是常用一乙醇胺-甲基二乙醇胺(monoethanolamine-methyl-diethanolamine,MEA-MDEA)复合胺溶液的2.6~3.3倍;GAC负载适量DBU对模拟烟气CO2具有良好的捕集效率,消除膜封效应能提高DBU-GAC吸附剂对CO2的吸附容量。周宏仓 肖旭 何都良 Nana Agyemang Prempeh 章文斌 谢文杰 徐露 2011中国电机工程学报2011,31,35:10
14Green light-emitting diodes based on hybrid perovskite films with mixed cesium and methylammonium cations显示文摘我们报导高质量的 C 0.4 麻省 0.6 PbBr 3 有在进 perovskite 晶体的 C + 的介绍之上的将近完整的表面范围和好排放性质的薄电影。C 0.4 麻省 0.6 PbBr 3 薄电影在轻射出的二极管作为放射性的层被使用。~ 的最大的外部量效率 2.0% 为这些绿射出的设备被完成。Junjie Si Yang Liu Nana Wang Meng Xu Jing Li Haiping He Jianpu Wang Yizheng Jin 2017Nano Research2017,10,4:9
15Simple synthesis of a porous Sb/Sb2O3 nanocomposite for a high-capacity anode material in Na-ion batteries显示文摘高能力的阳极材料为钠离子电池是高度合乎需要的。这里,多孔的 Sb/Sb 2 O 3 nanocomposite 被 Sb nanocrystals 的温和氧化成功地在空中综合。在里面合成, Sb 贡献好电导率和 Sb 2 O 3 改进骑车的稳定性,特别地在 0.02-1.5 V 的电压窗户以内。它在 540 mAh 的一个可逆能力留下 ??? ′Jun Pan Nana Wang Yanli Zhou Xianfeng Yang Wenyao Zhou Yitai Qian Jian Yang 2017Nano Research2017,10,5:9
16Performance of no-till corn precision planter equipped with row cleaners显示文摘In the continuous annual wheat-corn cropping area of North China Plain,no-till planting that promotes soil conservation and crop yield while reducing operation cost has been gradually accepted by local farmers.However,previous wheat residue is the main limiting factor affecting the performance of existing planters in placing seeds at uniform spacing and optimum depth in residue covered fields.In order to solve this problem,a kind of ground-wheel-driven row cleaner was designed,developed and mounted on row units of a four-row pneumatic precision planter.The planter has two adjacent row units equipped with the newly designed row cleaners and the other two adjacent row units equipped with the commonly used inactive row cleaners.This was used for planting at three forward speeds(4 km/h,6 km/h and 8 km/h)into half residue(HR)and whole residue(WR)plots.The amount of residue removal,seeding depth,emergence rate and indices of uniformity in seed spacing(missing-seeding index,quality of feeding index and precision index)were measured.The newly designed row cleaner performed better with regard to residue removal,with the average percentage of residue cleared as 63.0%compared to 40.3%for the inactive row cleaner.For the HR and WR plots,percentage of residue cleared of the newly designed row cleaner reached 57.1%and 68.9%respectively,suggesting that the newly designed row cleaner can work more effectively at high residue level.By contrast,with the percentage of residue cleared of the inactive row cleaner as 43.1%and 37.5%in HR and WR plots,suggesting that the inactive row cleaner just can work effectively under low residue condition.Values of missing-seeding index,QFI,precision index,coefficient of variation of depth and percent emergence for the newly designed row cleaner under whole residue level are comparable to those for the inactive row cleaner under half residue level.The result indicates that the effect of using the newly designed row cleaner is equal to that of reducing surface residue,and can help to maintain the uniformity of seed spacing and seeding depth.The newly designed row cleaner generally performed better at forward speed of 6 km/h,based on the distribution of seeds along rows and seeding depth uniformity.Yang Li Zhang Rui Gao Nana Cui Tao Liu Quanwei Zhang Dongxing 2015International Journal of Agricultural and Biological Engineering2015,8,5:9
17Calcium carbonate-methylene blue nanohybrids for photodynamic therapy and ultrasound imaging显示文摘Photodynamic therapy plays an important role in cancer treatment.In this work,methylene blue(MB)-embedded calcium carbonate nanorods(CaCO_3-MB NRs)have been synthesized for p H-responsive photodynamic therapy and ultrasound imaging.The morphology of CaCO_3-MB NRs can be controlled by modulating the concentration of Na_2CO_3 aqueous solution.The generation of effective reactive oxygen species(ROS)were confirmed by 1,3-diphenylisobenzofuran(DPBF)probe.Both photodynamic therapy performance and echogenic performance of CaCO_3-MB NRs were investigated to confirm the feasibility of CaCO_3-MB nanohybrids for ultrasound image-guided photodynamic therapy.Weili Fan Yu Qi Ranran Wang Chen Xu Nana Zhao Fu-Jian Xu 2018Science China(Life Sciences)2018,61,4:8
18An integrated chemical mass balance and source emission inventory model for the source apportionment of PM2.5 in typical coastal areas显示文摘The source apportionment of PM2.5 is essential for pollution prevention.In view of the weaknesses of individual models,we proposed an integrated chemical mass balancesource emission inventory(CMB-SEI)model to acquire more accurate results.First,the SEI of secondary component precursors(SO2,NOx,NH3,and VOCs)was compiled to acquire the emission ratios of these sources for the precursors.Then,a regular CMB simulation was executed to obtain the contributions of primary particle sources and secondary components(SO4^2-,NO3^-3,NH4^+,and SOC).Afterwards,the contributions of secondary components were apportioned into primary sources according to the source emission ratios.The final source apportionment results combined the contributions of primary sources by CMB and SEI.This integrated approach was carried out via a case study of three coastal cities(Zhoushan,Taizhou,and Wenzhou;abbreviated WZ,TZ,and ZS)in Zhejiang Province,China.The regular CMB simulation results showed that PM2.5 pollution was mainly affected by secondary components and mobile sources.The SEI results indicated that electricity,industrial production and mobile sources were the largest contributors to the emission of PM2.5 gaseous precursors.The simulation results of the CMB-SEI model showed that PM2.5 pollution in the coastal areas of Zhejiang Province presented complex pollution characteristics dominated by mobile sources,electricity production sources and industrial production sources.Compared to the results of the CMB and SEI models alone,the CMB-SEI model completely apportioned PM2.5 to primary sources and simultaneously made the results more accurate and reliable in accordance with local industrial characteristics.Nana Cheng Cheng Zhang Deji Jing Wei Li Tianjiao Guo Qiaoli Wang Sujing Li 2020Journal of Environmental Sciences2020,32,6:8
19N-doped carbon-stabilized PtCo nanoparticles derived from Pt@ZIF-67: Highly active and durable catalysts for oxygen reduction reaction显示文摘The development of catalysts with high activity and durability for the cathodicoxygen reduction reaction (ORR) in both alkaline and acidic media is importantfor improving the performance of the proton exchange membrane (PEM) fuelcells. This can be achieved by dispersing Pt-based alloy nanoparticles insideN-doped porous carbon frameworks. However, it still requires the developmentof a facile method towards synthesizing this unique hybrid structure. In this work,we demonstrate that N-doped carbon-stabilized PtCo nanoparticles (PtCo@NC)can be facilely synthesized via thermal decomposition of Pt-incorporatedCo-based zeolitic imidazolate framework (Pt@ZIF-67). The thickness of the carbonframework can be optimized to enable excellent durability, in sharp contrastto a commercial Pt/C catalyst. The mass activities achieved by optimizing thethickness of the carbon framework are 0.80 and 0.82 A-mg^-1, at 0.9 V vs. RHE inalkaline and acidic electrolytes, respectively, which are nearly 8 times greaterthan those of the Pt/C. This work provides an alternative approach to low-costand high-verformance catalvsts for both alkaline and acidic fuel cells.Nana Du Chengming Wang Ran Long Yujie Xiong 2017Nano Research2017,10,9:8
20Bottom water temperature measurements in the South China Sea,eastern Indian Ocean and western Pacific Ocean显示文摘文章报道了一批新的海底底水温度(BWT)数据,其中南海(SCS)158个站位、东印度洋(EIO)30个站位及西太平洋(WPO)37个站位。基于这批新的BWT数据,获得南海和西太平洋海域底水温度与水深经验关系,可为地球物理和物理海洋提供准确、可靠的海底温度边界。这将有助于海底油气资源调查与评估。同时,这批实测数据表明:1)水深超过3500m的海域,其底水温度在南海约为2.47℃,比东印度洋(~1.34℃)和西太平洋(~1.60℃)稍微偏高。这与大洋传送带模式所预测的情况比较吻合。该模式认为:低温高盐的海水,从北大西洋格陵兰岛和冰岛附近海域下沉到深层,然后向南流动,再与南极洲周围海域的低温高盐海水一同向北进入印度洋和太平洋。而南海是一个相对比较封闭的热带边缘海,其内部海水与印度洋和菲律宾海交换有限,导致海水温度整体高于印度洋和太平洋。2)台西南盆地水深在2700~3000m的部分站位,其底水温高达约3.00℃,明显高于其周边同水深海域底水温度(平均值约为2.33℃)。这可能是台西南盆地海底水热活动导致的结果。3)在东印度洋和西太平洋水深超过4800m海域,底水温度随着水压增大稍有升高,其升高率分别为10.6mK·MPa^(-1)和12.0mK·MPa^(-1)。这与理论估算的深层底水绝热压力温度梯度范围较为吻合。这也意味着东印度洋和西太平洋深层底水,主要由绝热自压作用导致其温度随着深度的增大而升高。YANG Xiaoqiu SHI Xiaobin ZHAO Junfeng YU Chuanhai GAO Hongfang CHEN Aihua LU Yuanzheng CEN Xianrong LIN Weiren ZENG Xin XU Hehua REN Ziqiang ZHOU Shengqi XU Ziying SUN Jinlong KAMIYA Nana LIN Jian 2018热带海洋学报2018,37,5:8
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