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136篇 您的检索式:作者名="Yiping XU"
    题名 作者 年代 出处 被引量
1Optimization of stratification scheme for a fishery-independent survey with multiple objectives显示文摘Fishery-independent surveys are often used for collecting high quality biological and ecological data to support fisheries management. A careful optimization of fishery-independent survey design is necessary to improve the precision of survey estimates with cost-effective sampling efforts. We developed a simulation approach to evaluate and optimize the stratification scheme for a fishery-independent survey with multiple goals including estimation of abundance indices of individual species and species diversity indices. We compared the performances of the sampling designs with different stratification schemes for different goals over different months. Gains in precision of survey estimates from the stratification schemes were acquired compared to simple random sampling design for most indices. The stratification scheme with five strata performed the best. This study showed that the loss of precision of survey estimates due to the reduction of sampling efforts could be compensated by improved stratification schemes, which would reduce the cost and negative impacts of survey trawling on those species with low abundance in the fishery-independent survey. This study also suggests that optimization of a survey design differed with different survey objectives. A post-survey analysis can improve the stratification scheme of fishery-independent survey designs.XU Binduo REN Yiping CHEN Yong XUE Ying ZHANG Chongliang WAN Rong 2015Acta Oceanologica Sinica2015,34,12:21
2Plant Prime Editors Enable Precise Gene Editing in Rice Cells显示文摘Genome editing is revolutionizing plant research and crop breeding.Sequence-specific nucleases(SSNs)such as zinc finger nuclease(ZFN)and TAL effector nuclease(TALEN)have been used to create site-specific DNA double-strand breaks and to achieve precise DNA modifications by promoting homology-directed repair(HDR)(Steinert et al.,2016;Voytas,2013).Later,RNA-guided SSNs such as CRISPR-Cas9,Cas12a,Cas12b,and their variants were applied for genome editing in plants(Li et al.,2013;Nekrasov et alM 2013;Tang et al.,2017;Zhong et al.,2019;Ming et al.,2020;Tang et al.,2019).However,HDR relies on simultaneous delivery of SSNs and DNA donors,which has been challenging in plants(Steinert et al.,2016;Zhang et aL,2019).Another challenge for realizing efficient HDR in plants is that DNA repair favors nonhomologous end joining(NHEJ)pathways over HDR in most cell types(Puchta,2005;Qi et al.,2013).Xu Tang Simon Sretenovic Qiurong Ren Xinyu Jia Mengke Li Tingting Fan Desuo Yin Shuyue Xiang Yachong Guo Li Liu Xuelian Zheng Yiping Qi Yong Zhang 2020Molecular Plant2020,13,5:20
3Growth and Mortality of Small Yellow Croaker(Larimichthys polyactis) Inhabiting Haizhou Bay of China显示文摘Length frequency data of small yellow croaker(Larimichthys polyactis) were acquired from the survey vessel in May,July,September and December,2011 in Haizhou Bay of China.In this study,921 fish individuals were analyzed for the estimation of growth and mortality parameters.Between length and weight,the power coefficient b was 2.7321,2.9703,3.0418 and 2.7252 for the 4 surveying months,respectively.The estimated von Bertalanffy growth function parameters were 230mm(L ∞) and 0.26yr-1(K) as were calculated with ELEFAN method equipped in FiSAT computer package.With length-converted catch curve analysis,the total mortality rate(Z) and its 95% confidence interval were 2.16(1.69-2.64) yr-1,0.59(0.15-1.04) yr-1,1.16(0.80-1.52) yr-1 and 0.96(0.70-1.23) yr-1 for the 4 surveying months,respectively,with the pooled data the value was 1.15(0.81-1.48) yr-1.The natural mortality rate(M) was 0.516 yr-1 as was calculated with Pauly's equation(the annual average sea water temperature was 11℃).Therefore,fish mortality rate was 0.634 yr-1.The yield-per-recruit analysis indicated that when t c was 1,F max was 0.7 and F 0.1 was 0.55.Currently,the age at first capture is about 1 year and F current was 0.634.Therefore,F current was larger than F 0.1 and less than F max.This indicates that current fish mortality is at a dangerously high level.With Gulland method,the biological reference point for fishery(F opt) was estimated as 0.516 yr-1,lower than current fish mortality.Accordingly,reducing catch in the region was strongly recommended.LIU Qun XU Binduo YE Zhenjiang REN Yiping 2012Journal of Ocean University of China2012,11,4:17
4Temporal changes in SSR allelic diversity of major rice cultivars in China显示文摘Forty simple sequence repeats (SSRs) were used to assess the changes of diversity in 310 major Chinese rice cultivars grown during the 1950s-1990s. Of the 40 SSR loci, 39 were polymorphic. A total of 221 alleles were detected with an average of 5.7 alleles per locus (Na). The Nei’s genetic diversity index (He) varied drastically among the loci (0.207 to 0.874, mean 0.625). Comparing the temporal changes in Na and He, the cultivars from the 1950s had more alleles and higher He scores than the cultivars from the other four decades Analysis of molecular variance (AMOVA) indicated that the genetic differentiation among the five decades was not significant in the whole set, but significant within indica and japonica. More changes among the decades were revealed in indica cultivars than in japonica cultivars. Some alleles had been lost in current rice cultivars in the 1990s, occurring more frequently in indica. These results suggest that more elite alien genetic resources should be explored to widen the genetic backgrounds of rice cultivars currently grown in China.Xinghua Wei Xiaoping Yuan Hanyong Yu Yiping Wang Qun Xu Shengxiang Tang 2009Journal of Genetics and Genomics2009,36,6:16
5Laparoscopic versus open pancreaticoduodenectomy for pancreatic ductal adenocarcinoma:a propensity score matching analysis显示文摘Background:A growing body of evidence supports the use of laparoscopic pancreaticoduodenectomy(LPD)as an efficient and feasible surgical technique.However,few studies have investigated its applicability in pancreatic ductal adenocarcinoma(PDAC),and the long-term efficacy of LPD on PDAC remains unclear.This study aimed to compare the short-and long-term outcomes between LPD and open pancreaticoduodenectomy(OPD)for PDAC.Methods:The data of patients who had OPD or LPD for PDAC between January 2013 and September 2017 were retrieved.Their postoperative outcomes and survival were compared after propensity score matching.Results:A total of 309 patients were included.After a 2:1 matching,93 cases in the OPD group and 55 in the LPD group were identified.Delayed gastric emptying(DGE),particularly grade B/C DGE,occurred less frequently in the LPD group than in the OPD group(1.8%vs.36.6%,P<0.001;1.8%vs.22.6%,P=0.001).The overall complication rates were significantly lower in the LPD group than in the OPD group(49.1%vs.71.0%,P=0.008),whereas the rates of major complications were similar(10.9%vs.14.0%,P=0.590).In addition,the median overall survival was comparable between the two groups(20.0 vs.18.7 months,P=0.293).Conclusion:LPD was found to be technically feasible with efficacy similar to OPD for patients with PDAC.Wentao Zhou Weiwei Jin Dansong Wang Chao Lu Xuefeng Xu Renchao Zhang Tiantao Kuang Yucheng Zhou Wenchuan Wu Dayong Jin Yiping Mou Wenhui Lou 2019Cancer Communications2019,39,1:14
6Surgical decompression in acute spinal cord injury: A review of clinical evidence, animal model studies, and potential future directions of investigation显示文摘为在尖锐针的绳索损害(SCI ) 的治疗的目标是减少第二等的损坏的程度并且便于神经新生和功能的恢复。尽管多重研究为尖锐 SCI 的治疗调查了潜在的新治疗,结果和管理协议在病人在改善瞄准了神经损害仍然保持无效。更最近的临床、基本的科学研究显示了外科的干预是为治疗的一种潜在地珍贵的形式;然而,角色并且外科的解压缩预定除了最佳的外科的干预,仍然是与尖锐 SCI 的外科的治疗相关的最争论的话题之一。当越来越多的潜在的治疗形式出现,动物模型为调查它的临床的申请和翻译进人的审判是枢轴的。这评论极其估价可得到的文学让临床、基本的科学研究加亮调查的程度考虑的那发生的、特定的治疗,和为未来研究的潜在的区域。Yiping LI Chandler L. WALKER Yi Ping ZHANG Christopher B. SHIELDS Xiao-Ming XU 2014Frontiers in Biology2014,9,2:14
7Plant Genome Editing Using FnCpfl and LbCpf Nucleases at Redefined and Altered PAM-Sites显示文摘ZhaohuiZhong Yingxiao Zhang Qi You XU Tang Qiurong Ren Shishi Liu Lijia Yang Yan Wang Xiaopei Liu Binglin Liu Tao Zhang Xuelian Zheng Ysa Le Yong Zhang Yiping Qi 2018Molecular Plant2018,11,7:10
8The Late Carboniferous–Early Permian Ocean-Continent Transition in the West Junggar,Central Asian Orogenic Belt: Constraints from Columnar Jointed Rhyolite显示文摘The West Junggar of the western Central Asian Orogenic Belt is one of the typical regions in the term of ocean subduction, contraction and continental growth in the Late Paleozoic. However, it is still controversial on the exact time of ocean-continent transition so far. This study investigates rhyolites with columnar joint in the West Junggar for the first time.Based on zircon U-Pb dating, we determined that the ages of the newly-discovered rhyolites are between 303.6 and 294.5 Ma, belonging to Late Carboniferous–Early Permian, which is the oldest rhyolite with columnar joint preserved in the world at present. Geochemical results show that the characteristics of the major element compositions include a high content of SiO_2(75.78–79.20 wt%) and a moderate content of Al_2O_3(12.21–13.19 wt%). The total alkali content(K_2O +Na_2O) is 6.14–8.05 wt%, among which K_2O is 2.09–4.72 wt% and the rate of K_2O/Na_2O is 0.38–3.05. Over-based minerals such as Ne, Lc, and Ac do not appear. The contents of TiO_2(0.09–0.24 wt%), CaO(0.15–0.99 wt%) and MgO(0.06–0.18 wt%) are low. A/CNK=0.91–1.68, A/NK=1.06–1.76, and as such, these are associated with the quasi-aluminum-weak peraluminous high potassium calc-alkaline and some calc-alkaline magma series. These rhyolites show a significant negative Eu anomaly with relative enrichment of LREE and LILE(Rb, Ba, Th, U, K) and depletion of Sr, HREE and HFSE(Nb, Ta, Ti, P). These rhyolites also have the characteristics of an A2-type granite, similar to the Miaoergou batholith,which indicates they both were affected by post-orogenic extension. Combining petrological, zircon U-Pb dating and geochemical characteristics of the rhyolites, we conclude that the specific time of ocean-continent transition of the West Junggar is the Late Carboniferous–Early Permian.XU Shenglin CHEN Xuanhua LI Tingdong SHI Jianjie DING Weicui LI Bing HUANG Penghui ZHANG Yiping ZHANG Yaoyao MA Feizhou 2019Acta Geologica Sinica(English Edition)2019,93,2:9
9Restoration of electrical microenvironment enhances bone regeneration under diabetic conditions by modulating macrophage polarization显示文摘Macrophage-mediated inflammation compromises bone repair in diabetic patients.Electrical signaling cues are known to regulate macrophage functions.However,the biological effects of electrical microenvironment from charged biomaterials on the immune response for regulating osteogenesis under diabetic conditions remain to be elucidated.Herein the endogeneous electrical microenvironment of native bone tissue was recapitulated by fabricating a ferroelectric BaTiO_(3)/poly(vinylidene fluoridetrifluoroethylene)(BTO/P(VDF-TrFE))nanocomposite membrane.In vitro,the polarized BaTiO_(3)/poly(vinylidene fluoridetrifluoroethylene)(BTO/P(VDF-TrFE))nanocomposite membranes inhibited high glucose-induced M1-type inflammation,by effecting changes in cell morphology,M1 marker expression and pro-inflammatory cytokine secretion in macrophages.This led to enhanced osteogenic differentiation of human bone marrow mesenchymal stem cells(BM-MSCs).In vivo,the biomimetic electrical microenvironment recapitulated by the polarized nanocomposite membranes switched macrophage phenotype from the pro-inflammatory(M1)into the pro-healing(M2)phenotype,which in turn enhanced bone regeneration in rats with type 2 diabetes mellitus.Mechanistic studies revealed that the biomimetic electrical microenvironment attenuated pro-inflammatory M1 macrophage polarization under hyperglycemic conditions by suppressing expression of AKT2 and IRF5 within the PI3K-AKT signaling pathway,thereby inducing favorable osteo-immunomodulatory effects.Our study thus provides fundamental insights into the biological effects of restoring the electrical microenvironment conducive for osteogenesis under DM conditions,and offers an effective strategy to design functionalized biomaterials for bone regeneration therapy in diabetic patients.Xiaohan Dai Boon Chin Heng Yunyang Bai Fuping You Xiaowen Sun Yiping Li Zhangui Tang Mingming Xu Xuehui Zhang Xuliang Deng 2021Bioactive Materials2021,6,7:9
10Wheat genomic study for genetic improvement of traits in China显示文摘Bread wheat(Triticum aestivum L.)is a major crop that feeds 40%of the world’s population.Over the past several decades,advances in genomics have led to tremendous achievements in understanding the origin and domestication of wheat,and the genetic basis of agronomically important traits,which promote the breeding of elite varieties.In this review,we focus on progress that has been made in genomic research and genetic improvement of traits such as grain yield,end-use traits,flowering regulation,nutrient use efficiency,and biotic and abiotic stress responses,and various breeding strategies that contributed mainly by Chinese scientists.Functional genomic research in wheat is entering a new era with the availability of multiple reference wheat genome assemblies and the development of cutting-edge technologies such as precise genome editing tools,highthroughput phenotyping platforms,sequencing-based cloning strategies,high-efficiency genetic transformation systems,and speed-breeding facilities.These insights will further extend our understanding of the molecular mechanisms and regulatory networks underlying agronomic traits and facilitate the breeding process,ultimately contributing to more sustainable agriculture in China and throughout the world.Jun Xiao Bao Liu Yingyin Yao Zifeng Guo Haiyan Jia Lingrang Kong Aimin Zhang Wujun Ma Zhongfu Ni Shengbao Xu Fei Lu Yuannian Jiao Wuyun Yang Xuelei Lin Silong Sun Zefu Lu Lifeng Gao Guangyao Zhao Shuanghe Cao Qian Chen Kunpu Zhang Mengcheng Wang Meng Wang Zhaorong Hu Weilong Guo Guoqiang Li Xin Ma Junming Li Fangpu Han Xiangdong Fu Zhengqiang Ma Daowen Wang Xueyong Zhang Hong-Qing Ling Guangmin Xia Yiping Tong Zhiyong Liu Zhonghu He Jizeng Jia Kang Chong 2022Science China(Life Sciences)2022,65,9:9
11The Impacts of Permafrost Change on NPP and Implications:A Case of the Source Regions of Yangtze and Yellow Rivers显示文摘This paper studies the relationship between net primary productivity (NPP) and annual average air temperature (GT) at 0cm above ground in permafrost regions by using revised Chikugo NPP model,cubic spline interpolating functions,and non-linear regression methods.The source regions of the Yangtze and Yellow Rivers were selected as the research areas.Results illustrate that:(1) There is significant non-linear relationship between NPP and GT in various typical years;(2) The maximum value of NPP is 6.17,5.87,7.73,and 5.41 DM·t·hm-2 ·a-1 respectively,and the corresponding GT is 7.1,10.0,21.2,and 8.9 o C respectively in 1980,1990,2000 and 2007;(3) In 1980,the sensitivity of NPP to GT is higher than in 1990,2000 and 2007.This tendency shows that the NPP presents change from fluctuation to an adaptation process over time;(4) During 1980~2007,the accumulated NPP was reduced to 8.05,and the corresponding carrying capacity of theoretical livestock reduced by 11%;(5) The shape of the demonstration region of ecological compensation system,livelihood support system,and science appraisal system in the source regions of Yangtze and Yellow Rivers are an important research for increasing the adaptation capacity and balancing protection and development.FANG Yiping QIN Dahe DING Yongjian YANG Jianping XU Keyan 2011Journal of Mountain Science2011,8,3:9
12A Single Transcript CRISPR-Cas9 System for Efficient Genome Editing in Plants显示文摘Tang, Xu Zheng, Xuelian Qi, Yiping Zhang, Dengwei Cheng, Yan Tang, Aiting Voytas, Daniel F. Zhang, Yong 2016Molecular Plant2016,9,7:8
13Occurrence and removal of organic micropollutants in the treatment of landfill leachate by combined anaerobic-membrane bioreactor technology显示文摘Organic micropollutants,with high toxicity and environmental concern,are present in the landfill leachate at much lower levels than total organic constituents (chemical oxygen demand (COD),biochemical oxygen demand (BOD),or total organic carbon (TOC)),and few has been known for their behaviors in different treatment processes.In this study,occurrence and removal of 17 organochlorine pesticides (OCPs),16 polycyclic aromatic hydrocarbons (PAHs),and technical 4-nonylphenol (4-NP) in landfill leachate in a combined anaerobic-membrane bioreactor (MBR) were investigated.Chemical analyses were performed in leachates sampled from different treatment processes,using solid-phase extraction and gas chromatography with electron capture detector and mass spectrometry.Concentrations of OCPs,PAHs,and 4-NP in the raw leachate were detected within the range from ND (not detected) to 595.2 ng/L,which were as low as only 10-7-10-5 percentage of TOC (at the concentration of 2,962 mg/L).The removal of 4-NP was mainly established in the MBR process,in agreement with removals of COD,BOD,and TOC.However,the removals of OCPs and PAHs were different,mainly achieved in the anaerobic process.High removal effciencies of both total organic constituents and organic micropollutants could be achieved by the combined anaerobic-MBR technology.The removal effciencies of total organic constituents were in the order of BOD (99%) > COD (89%) > TOC (87%),whereas the removal effciencies of investigated organic micropollutants were as follows: OCPs (94%) > 4-NP (77%) > PAHs (59%).Yiping XU Zijian WANG 2008Journal of Environmental Sciences2008,20,11:7
14A novel Cu-bearing high-entropy alloy with significant antibacterial behavior against corrosive marine biofilms显示文摘The design of novel high-entropy alloys(HEAs)provides a unique opportunity for the development of structure-function integrated materials with high mechanical and antimicrobial properties.In this study,by employing the antibacterial effect of copper,a novel Al0.4CoCrCuFeNi HEA with broad-spectrum antibacterial and strong mechanical properties was designed.High concentrations of copper ions released from the HEA prevented growth and biofilm formation by biocorrosive marine bacterial species.These findings serve as a proof-of-concept for further development of unique HEA materials with high antimicrobial efficiency and mechanical properties,compared to conventional antibacterial alloys.Enze Zhou Dongxu Qiao Yi Yang Dake Xu Yiping Lu Jianjun Wang Jessica A.Smith Huabing Li Hongliang Zhao Peter K.Liaw Fuhui Wang 2020Journal of Materials Science & Technology2020,42,11:6
15Enhanced antibacterial behavior of a novel Cu-bearing high-entropy alloy显示文摘Contact infection of bacteria and viruses has been a critical threat to human health. The worldwideoutbreak of COVID-19 put forward urgent requirements for the research and development of the selfantibacterial materials, especially the antibacterial alloys. Based on the concept of high-entropy alloys, thepresent work designed and prepared a novel Co_(0.4)FeCr_(0.9)Cu_(0.3) antibacterial high-entropy alloy with superior antibacterial properties without intricate or rigorous annealing processes, which outperform the antibacterial stainless steels. The antibacterial tests presented a 99.97% antibacterial rate against Escherichiacoli and a 99.96% antibacterial rate against Staphylococcus aureus after 24 h. In contrast, the classic antibacterial copper-bearing stainless steel only performed the 71.50% and 80.84% antibacterial rate, respectively. The results of the reactive oxygen species analysis indicated that the copper ion release and theimmediate contact with copper-rich phase had a synergistic effect in enhancing antibacterial properties.Moreover, this alloy exhibited excellent corrosion resistance when compared with the classic antibacterialstainless steels, and the compression test indicated the yield strength of the alloy was 1015 MPa. Thesefindings generate fresh insights into guiding the designs of structure-function-integrated antibacterial alloys.Guangyu Ren Lili Huang Kunling Hu Tianxin Li Yiping Lu Dongxu Qiao Haitao Zhang Dake Xu Tongmin Wang Tingju Li Peter K.Liaw 2022Journal of Materials Science & Technology2022,,22:6
16Review of Femtosecond-Laser-Inscribed Fiber Bragg Gratings:Fabrication Technologies and Sensing Applications显示文摘Fiber Bragg grating(FBG)is the most widely used optical fiber sensor due to its compact size,high sensitivity,and easiness for multiplexing.Conventional FBGs fabricated by using an ultraviolet(UV)laser phase-mask method require the sensitization of the optical fiber and could not be used at high temperatures.Recently,the fabrication of FBGs by using a femtosecond laser has attracted extensive interests due to its excellent flexibility in creating FBGs array or special FBGs with complex spectra.The femtosecond laser could also be used for inscribing various FBGs on almost all fiber types,even fibers without any photosensitivity.Such femtosecond-laser-induced FBGs exhibit excellent thermal stability,which is suitable for sensing in harsh environment.In this review,we present the historical developments and recent advances in the fabrication technologies and sensing applications of femtosecond-laser-inscribed FBGs.Firstly,the mechanism of femtosecond-laser-induced material modification is introduced.And then,three different fabrication tech no logies,i.e.,femtosecond laser phase mask technology,femtosecond laser holographic interferometry,and femtosecond laser direct writing technology,are discussed.Finally,the advances in high-temperature sensing applications and vector bending sensing applications of various femtosecond-laser-inscribed FBGs are summarized.Such femtosecond-laser-inscribed FBGs are promising in many industrial areas,such as aerospace vehicles,nuclear plants,oil and gas explorations,and advanced robotics in harsh environments.Jun HE Baijie XU Xizhen XU Changrui LIAO Yiping WANG 2021Photonic Sensors2021,11,2:6
17Traditional Chinese Medicine for the treatment of influenza: a systematic review and Meta-analysis of randomized controlled trials显示文摘OBJECTIVE: To justify the clinical use of Traditional Chinese Medicine(TCM) in the treatment of influenza.METHODS: MEDLINE, EMBASE, Chinese Biomedical Literature Database, China National Knowledge Infrastructure Database, China Science and Technology Journal Database, Wanfang Database and the Cochrane Database of Systematic Reviews were searched from thedate of inception until January 1,2013, for the literature on treatment of influenza with TCM.RESULTS: A total of 7 randomized controlled trials were identified and reviewed. Of these trials, 2 compared a(modified) prescription of TCM with oseltamivir and 5 compared a patent traditional Chinese drug with oseltamivir. Based on the Meta-analysis,compared to oseltamivir, the(modified) prescription had similar effect in defervescence [WMD=5.66, 95% CI(﹣32.02, 43.35), P=0.77] and viral shedding [WMD=﹣ 6.21, 95% CI(﹣84.19, 71.76), P=0.88], and the patent traditional Chinese drug also had similar effect in viral shedding [WMD=﹣ 0.24,95% CI(﹣4.79, 4.31), P=0.92] but more effective in defervescence [WMD=﹣4.65, 95%CI(﹣8.91, ﹣0.38),P=0.03].CONCLUSION: TCM has potential positive effects in the treatment of influenza.Chunya Wang Hao Wang Xinying Liu Dongping Xu Yiping Tang Ping Luo 2014Journal of Traditional Chinese Medicine2014,34,5:5
18Optimization of environmental variables in habitat suitability modeling for mantis shrimp Oratosquilla oratoria in the Haizhou Bay and adjacent waters显示文摘Habitat suitability index(HSI)models have been widely used to analyze the relationship between species abundance and environmental factors,and ultimately inform management of marine species.The response of species abundance to each environmental variable is different and habitat requirements may change over life history stages and seasons.Therefore,it is necessary to determine the optimal combination of environmental variables in HSI modelling.In this study,generalized additive models(GAMs)were used to determine which environmental variables to be included in the HSI models.Significant variables were retained and weighted in the HSI model according to their relative contribution(%)to the total deviation explained by the boosted regression tree(BRT).The HSI models were applied to evaluate the habitat suitability of mantis shrimp Oratosquilla oratoria in the Haizhou Bay and adjacent areas in 2011 and 2013–2017.Ontogenetic and seasonal variations in HSI models of mantis shrimp were also examined.Among the four models(non-optimized model,BRT informed HSI model,GAM informed HSI model,and both BRT and GAM informed HSI model),both BRT and GAM informed HSI model showed the best performance.Four environmental variables(bottom temperature,depth,distance offshore and sediment type)were selected in the HSI models for four groups(spring-juvenile,spring-adult,falljuvenile and fall-adult)of mantis shrimp.The distribution of habitat suitability showed similar patterns between juveniles and adults,but obvious seasonal variations were observed.This study suggests that the process of optimizing environmental variables in HSI models improves the performance of HSI models,and this optimization strategy could be extended to other marine organisms to enhance the understanding of the habitat suitability of target species.Yunlei Zhang Huaming Yu Haiqing Yu Binduo Xu Chongliang Zhang Yiping Ren Ying Xue Lili Xu 2020Acta Oceanologica Sinica2020,39,6:5
19Review of protection and fault handling for a flexible DC grid显示文摘With the development of power electronics technology,the flexible DC grid will play a significant role in promoting the transformation and reformation of the power grid.It is immune to commutation failure and has high flexibility in power control and renewable energy grid integration.However,the protection and fault handling technology for a flexible DC grid is a big challenge because of the limited overcurrent capability of the converters.This paper summarizes the development of the flexible DC grid,and analyzes the fault characteristics in detail.Next,the applicability,advantages and disadvantages of the existing protection principle,fault isolation and recovery schemes are reviewed.Finally,the key problems and development trend of the future flexible DC grid are pointed out and forecasted respectively.Jinghan He Keao Chen Meng Li Yiping Luo Chenguang Liang Yin Xu 2020Protection and Control of Modern Power Systems2020,5,1:5
20Phosphate limitation of phytoplankton growth in the Changjiang Estuary显示文摘Laboratory experiments of bioassay with Pltaeodaetytum tricornutum, Chatoceros didymus, Chaetoreros calcitraus and Heterogtoea sp. sampled from the Changjiang Estuary in spring and summer, 1986, indicated that both N and P limit phytoplankton growth in the medium with N : P ranged between 8-30, and N limits phytoplankton production in the medium with N: P<8, while P is the limitary nutrient in the N : P>30. Generally, N : P in the Changjiang Estuary waters is 2 times higher than Redfield ratio. The bioassay experiments with high N : P water samples collected from Changjiang Estuary show that phytoplankton production is limited by P. Phytopiankton appears to give priority to the uptake of P at all periods of time. And the optimum N:P for phytoplankton growth is determined to be 18.Hu Minghui, Yang Yiping, Xu Chunling and P. J. Harrison Oceanography Department of Xiamen University, Xiamen, ChinaSub-bureau of East China Sea, State Oceanic Administration, Shanghai, ChinaOceanography Department, U. B. C. , Canada 1990Acta Oceanologica Sinica1990,9,3:4
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