检索结果-南通市图书馆

Latitudinal and interannual variations of the spring phytoplankton bloom peak in the East Asian marginal seas

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2016年第12期35卷 81-88页

作者： CHEN Cheng MAO Zhihua HAN Guoqi ZHU Qiankun GONG Fang wang tianyu State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration Biological and Physical Oceanography Section Fisheries and Oceans CanadaNorthwest Atlantic Fisheries CentreNewfoundland and Labrador

Combined studies of latitudinal and interannual variations of annual phytoplankton bloom peak in East Asian marginal seas(17°–58°N, including the northern South China Sea(SCS), Kuroshio waters, the Sea of Japan and the Okhotsk Sea) are rarely. Based on satellite-retrieved ten-year(2003–2012) median timing of the annual Chlorophyll a concentration(Chl a) climax, here we report that this annual spring bloom peak generally delays from the SCS in January to the Okhotsk Sea in June at a rate of(21.20±2.86) km/d(decadal median±SD). Spring bloom is dominant feature of the phytoplankton annual cycle over these regions, except for the SCS which features winter bloom. The fluctuation of the annual peak timing is mainly within ±48 d departured from the decadal median peak date, therefore this period(the decadal median peak date ±48 d) is defined as annual spring bloom period. As sea surface temperature rises, earlier spring bloom peak timing but decreasing averaged Chl a biomass in the spring bloom period due to insufficient light is evident in the Okhotsk Sea from 2003 to 2012. For the rest of three study domains, there are no significant interannual variance trend of the peak timing and the averaged Chl a biomass. Furthermore this change of spring phytoplankton bloom timing and magnitude in the Okhotsk Sea challenges previous prediction that ocean warming would enhance algal productivity at high latitudes.

关键词： latitudinal and interannual variation spring bloom peak phytoplankton phenology East Asian marginal seas climate change

Investigation of formaldehyde sources and its relative emission intensity in shipping channel environment

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第8期142卷 142-154页

作者： Jiaqi Liu Shanshan wang Yan Zhang Yuhao Yan Jian Zhu Sanbao Zhang tianyu wang Yibing Tan Bin Zhou Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3) Department of Environmental Science and EngineeringFudan UniversityShanghai 200433China Institute of Eco-Chongming(IEC) No.20 Cuiniao RoadShanghai 202162China Institute of Atmospheric Sciences Fudan UniversityShanghai 200433China National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary Fudan UniversityShanghai 200438China Institute of Digitalized Sustainable Transformation Big Data InstituteFudan UniversityShanghai 200433China

Formaldehyde(HCHO)is considered one of the most abundant gas-phase carbonyl compounds in the atmosphere,which can be directly emitted through transportation ***-Path Differential Optical Absorption Spectroscopy(LP-DOAS)was used to observe HCHO in the river channel of Wusong Wharf in Shanghai,China for the whole year of *** to the impact of ship activity,the annual average HCHO level in the channel is about2.5 times higher than that in the nearby campus *** explain the sources of HCHO under different meteorological conditions,the tracer-pair of CO and O_(x)(NO_(2)+O_(3))was used on the clustered air *** results of the source appointment show that primary,secondary and background account for 24.14%(3.34±1.19 ppbv),44.78%(6.20±2.04ppbv)and 31.09%(4.31±2.33 ppbv)of the HCHO in the channel when the air masses were from the mixed direction of the city and channel,*** performing background station subtraction at times of high primary HCHO values and resolving the plume peaks,directly emitted HCHO/NO_(2)in the channel environment and plume were determined to be mainly distributed between 0.2 and *** cargo ships with higher sailing speeds or main engine powers tend to have higher HCHO/NO_(2)*** the knowledge of NO_(2)(or NO_(x))emission levels from ships,this study may provide data support for the establishment of HCHO emission factors.

关键词： HCHO LP-DOAS Channel environment Ship emissions

Identification of a Printed Anti-Counterfeiting Code Based on Feature Guidance Double Pool Attention Networks

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第5期75卷 3431-3452页

作者： Changhui You Hong Zheng Zhongyuan Guo tianyu wang Jianping Ju Xi Li School of Cyber Science and Engineering Wuhan UniversityWuhan430000China School of Electronic Information Wuhan UniversityWuhan430000China College of Artificial Intelligence Nanchang Institute of Science and TechnologyNanchang330108China

The authenticity identification of anti-counterfeiting codes based on mobile phone platforms is affected by lighting environment,photographing habits,camera resolution and other factors,resulting in poor collection quality of anti-counterfeiting codes and weak differentiation of anti-counterfeiting codes for high-quality *** an anticounterfeiting code authentication algorithm based on mobile phones is of great commercial *** the existing algorithms developed based on special equipment can effectively identify forged anti-counterfeiting codes,the anti-counterfeiting code identification scheme based on mobile phones is still in its *** address the small differences in texture features,low response speed and excessively large deep learning models used in mobile phone anti-counterfeiting and identification scenarios,we propose a feature-guided double pool attention network(FG-DPANet)to solve the reprinting forgery problem of printing anti-counterfeiting *** address the slight differences in texture features in high-quality reprinted anti-counterfeiting codes,we propose a feature guidance algorithm that creatively combines the texture features and the inherent noise feature of the scanner and printer introduced in the reprinting process to identify anti-counterfeiting code *** introduction of noise features effectively makes up for the small texture difference of high-quality anti-counterfeiting *** double pool attention network(DPANet)is a lightweight double pool attention residual *** the condition of ensuring detection accuracy,DPANet can simplify the network structure as much as possible,improve the network reasoning speed,and run better on mobile devices with low computing *** conducted a series of experiments to evaluate the FG-DPANet proposed in this *** results show that the proposed FG-DPANet can resist highquality and small-size anti-counterfeiting code reprint forgery.B

关键词： Deep learning digital image anti-counterfeiting feature guidance image processing reprint forgery

Coupling effects of water and nitrogen on photosynthetic characteristics,nitrogen uptake,and yield of sunflower under drip irrigation in an oasis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2021年第5期14卷 130-141页

作者： tianyu wang Zhenhua wang Qiang Wu Jinzhu Zhang Lishuang Quan Bihang Fan Li Guo College of Water Resources and Architectural Engineering Shihezi UniversityShihezi 832000XinjiangChina Key Laboratory of Modern Water-saving Irrigation Corp Shihezi UniversityShihezi 832000XinjiangChina State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China

An experiment was conducted in an oasis area in northwest China to assess the coupling effects of water and nitrogen supply through drip irrigation on photosynthetic characteristics,nitrogen uptake,and yield of sunflower(Helianthus annuus L.),as well as the nitrate distribution in the root-zone *** experiment included three irrigation levels(210[W1],300[W2],and 390[W3]mm),three nitrogen levels(162[N1],232[N2],and 302[N3]kg/hm^(2)),and control treatment(no fertilization during whole growth period and only irrigated at the budding stage).A nitrogen content over-accumulation in the soil was observed under the low irrigation amount with high fertilizer supply,which cannot enhance the sunflowers’absorption of *** irrigation caused leach of the soil nitrogen,reduced nitrogen content in the root-zone soil(0-40 cm)and limited nitrogen uptake by the *** low irrigation amount with high fertilizer supply can increase the nitrogen content in the soil,it cannot enhance the sunflowers’absorption of *** the vegetative stage of sunflower growth,the accumulation of nitrogen in the organs was mainly concentrated in the leaves,while it was transferred to the flower disk at the reproductive growth *** coupling of water and nitrogen improved the transport of nitrogen from leaves and stems to the flower disk and promoted the formation of yield *** regression equations were established with irrigation and fertilization amount as independent variables,and seed rate,seed weight per flowerdisk,1000 grain weight,yield,water use efficiency and nitrogen partial factor productivity as dependent variables,*** regression and spatial analysis suggested that the irrigation amount of 241.62-253.35 mm and the fertilization application of 202.02-209.40 N kg/hm^(2)was a good irrigation strategy,under which all six factors exceed 75%of their maxima,and the yield of sunflower reached 3229.3 kg/hm^(2).

关键词： fertilization Helianthus annuus L. irrigation management nitrogen transformation nutrient uptake Xinjiang

Advanced liquid crystal-based switchable optical devices for light protection applications:principles and strategies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2023年第4期12卷 512-541页

作者： Ruicong Zhang Zhibo Zhang Jiecai Han Lei Yang Jiajun li Zicheng Song tianyu wang Jiaqi Zhu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Research Center of Analysis and Measurement Harbin Institute of TechnologyHarbin 150080China School of Energy Science&Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Micro-systems and Micro-structures Manufacturing Ministry of EducationHarbin 150080China

With the development of optical technologies,transparent materials that provide protection from light have received considerable attention from *** important channels for external light,windows play a vital role in the regulation of light in buildings,vehicles,and *** is a need for windows with switchable optical properties to prevent or attenuate damage or interference to the human eye and light-sensitive instruments by inappropriate optical *** this context,liquid crystals(LCs),owing to their rich responsiveness and unique optical properties,have been considered among the best candidates for advanced light protection *** this review,we provide an overview of advances in research on LC-based methods for protection against ***,we introduce the characteristics of different light sources and their protection ***,we introduce several classes of light modulation principles based on liquid crystal materials and demonstrate the feasibility of using them for light *** addition,we discuss current light protection strategies based on liquid crystal materials for different ***,we discuss the problems and shortcomings of current *** propose several suggestions for the development of liquid crystal materials in the field of light protection.

关键词： optical crystal liquid

Development and Evaluation of a Universal and Supersensitive NS1-Based Luciferase Immunosorbent Assay to Detect Zika Virus-Specific IgG

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Virologica Sinica 2020年第1期35卷 93-102页

作者： tianyu wang Ying Zhan De Wu Zhihai Chen Wei Wu Yao Deng Wenling wang Wenjie Tan Shixing Tang Guangdong Provincial Key Laboratory of Tropical Disease Research Department of EpidemiologySchool of Public HealthSouthern Medical UniversityGuangzhou 510515China NHC Key Laboratory of Biosafety National Institute for Viral Disease Control and PreventionChina CDCBeijing 102206China Key Laboratory for Repository and Application of Pathogenic Microbiology Research Center for Pathogens Detection Technology of Emerging Infectious DiseasesGuangdong Provincial Center for Disease Control and PreventionGuangzhou 511430China The National Clinical Key Department of Infectious Disease Beijing Ditan HospitalCapital Medical UniversityBeijing 100015China

Zika virus(ZIKV) causes rash, moderate fever, conjunctivitis, and arthralgia, and has serious connection with neurological complications;therefore, it is a major threat to public health. A rapid and supersensitive method for detecting anti-ZIKV antibodies in humans and animals is thus urgently required. Here, we report an NS1-based luciferase immunosorbent assay(LISA), developed to detect ZIKV-specific IgG. Fusion proteins including a reporter Nano-luciferase(NLuc) and various fragments of ZIKV NS1 protein were expressed in 293 T cells. LISA was performed using the above cell lysates containing the expressed fusion proteins. Sample panels of humans and animals infected with ZIKV were examined for sensitivity of LISA, relative to those of ZIKV RT-PCR, commercial NS1-based ELISA, and micro-neutralization(MN) *** and potential cross-reactivity were also evaluated using various convalescent serum samples derived from patients infected with dengue virus(DENV), Japanese encephalitis virus(JEV), and hepatitis C virus(HCV). Results indicated the optimal antigenic domain for anti-ZIKV IgG detection was located within 172–352 amino acids(aa) of ZIKV NS1 protein. NS1-based LISA performs better than commercial ELISA in anti-ZIKV Ig G detection. LISA was shown to be at least fourfold more sensitive than commercial ELISA, and could detect anti-ZIKV Ig G in various animal hosts without the need of species-specific labeled antibody. This novel assay is potentially useful for the rapid and sensitive detection of anti-ZIKV IgG in human and animal samples.

关键词： Zika virus(ZIKV) NS1 Luciferase immunosorbent assay IgG Detection

DNA recognition patterns of the multi-zinc-finger protein CTCF: a mutagenesis study

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2018年第6期8卷 900-908页

作者： Jingjing Guo Ni Li Jiexiong Han Fei Pei tianyu wang Duo Lu Jiandong Jiang State Key Laboratory of Bioactive Substance and Function of Natural Medicine Institute of Materia Medica Chinese Academy of Medical Sciences and Peking Union Medical College

CCCTC-binding factor(CTCF) is a zinc-finger protein, serving an important part in the genome architecture as well as some biochemical processes. Over 70,000 CTCF binding DNA sites have been detected genome-wide, and most anchors of chromatin loops are demarcated with the CTCF *** protein or RNA molecules interact with DNA-bound CTCF to conduct different biological functions, and potentially the interfaces between CTCF and its cofactors can be targets for drug development. Here we identify the effective region of CTCF in DNA recognition, which defines the exposed CTCF surface feature for the interaction of cofactors. While the zinc-finger region contributes the most in DNA association, its binding affinity varies based on different DNA sequences. To investigate the effectiveness of individual zinc-fingers, the key residues are mutated to inactivate the DNA binding ability, while the finger configuration and the spacing between fingers are preserved. The strategy is proved to be successful, while clear differences are observed in the DNA binding affinities among the 11 finger mutants and the result is consistent to previous studies in general. With the help of inactivated finger mutants, we identify the ineffective fingers and the dominant effective fingers, which form distinctive patterns on different DNA targets.

关键词： CTCF Zinc-finger Structure integrity Mutagenesis DNA recognition patterns

Genome Analysis of Plasmodium falciparum:A Preliminary Observation-Sierra Leone,2022-2023

在线全文

学校读者我要写书评

暂无评论

China CDC weekly 2024年第17期6卷 368-373页

作者： tianyu wang Haimo Shen Bin Xu Wanxuan Yang Shenbo Chen Junhu Chen National Institute of Parasitic Diseases Chinese Center for Disease Control and Prevention(Chinese Center for Tropical Diseases Research)NHC Key Laboratory of Parasite and Vector BiologyWHO Collaborating Centre for Tropical DiseasesNational Centre for International Research on Tropical DiseasesShanghaiChina School of Basic Medical Sciences and Forensic Medicine Hangzhou Medical CollegeHangzhou CityZhejiang ProvinceChina School of Global Health Chinese Centre for Tropical Diseases ResearchShanghai Jiao Tong University School of MedicineShanghaiChina Hainan Tropical Diseases Research Center(Hainan Sub-Center Chinese Center for Tropical Diseases Research)Haikou CityHainan ProvinceChina.

What is already known about this topic?Sierra Leone,with a gross domestic product(GDP)per capita below$300 and significant poverty,ranks among the world’s least developed countries(LDCs).Despite its modest population of 8.6 million,the nation reports approximately 2.6 million malaria cases ***,there has been no reporting on the malaria genome data from this *** is added by this report?In this study,we present the first reported wholegenome sequence analysis of 19 high parasite-density Plasmodium falciparum isolates from Sierra Leone,providing insights into the genomic epidemiology of this high-prevalence *** found a high degree of relatedness among infections and substantial genetic diversity,consistent with the gradual reduction in overall case ***,our whole-genome analysis revealed that,beyond drug-resistance genes,gene families related to blood cell invasion,immune evasion,and others are undergoing directional *** suggests that the population in Sierra Leone has developed a relatively strong acquired *** are the implications for public health practice?The genomic data not only facilitate the creation of single nucleotide polymorphism barcodes for case tracking but also enable the analysis of evolving transmission dynamics and selection ***,the samples from Sierra Leone exhibited higher selective pressures on resistance genes compared to those from Asia,a trend not commonly observed in other African *** suggests that less stringent healthcare systems and inconsistent treatment strategies can subject parasites to increased drug pressure,thereby accelerating the development of resistant strains.

关键词： epidemiology invasion Observation

Data fusion in data scarce areas using a back-propagation artificial neural network model： a case study of the South China Sea

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2018年第2期12卷 280-298页

作者： Zheng wang Zhihua MAO Junshi XIA Peijun DU Liangliang SHI Haiqing HUANG tianyu wang Fang GONG Qiankun ZHU School of Geographic and Oceanographic Sciences Nanjing University Nanjing 210023 China Collaborative Innovation Center for the South China Sea Studies Nanjing University Nanjing 210023 China States Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography State Oceanic Administration Hangzhou 310012 China Research Center for Advanced Science and Technology The University of Tokyo Tokyo 153-8904 Japan Ocean College Zhejiang University Hangzhou 310058 China

The cloud cover for the South China Sea andits coastal area is relatively large throughout the year,which limits the potential application of optical remotesensing. A H J-charge-coupled device （HJ-CCD） has theadvantages of wide field, high temporal resolution, andshort repeat cycle. However, this instrument suffers fromits use of only four relatively low-quality bands whichcan＇t adequately resolve the features of long *** Landsat Enhanced Thematic Mapper-plus （ETM＋）provides high-quality data, however, the Scan LineCorrector （SLC） stopped working and caused striping ofremote sensed images, which dramatically reduced thecoverage of the ETM＋ data. In order to combine theadvantages of the HJ-CCD and Landsat ETM＋ data, weadopted a back-propagation artificial neural network （BP-ANN） to fuse these two data types for this study. Theresults showed that the fused output data not only have theadvantage of data intactness for the HJ-CCD, but also havethe advantages of the multi-spectral and high radiometricresolution of the ETM＋ data. Moreover, the fused datawere analyzed qualitatively, quantitatively and from apractical application point of view. Experimental studiesindicated that the fused data have a full spatial distribution,multi-spectral bands, high radiometric resolution, a smalldifference between the observed and fused output data, anda high correlation between the observed and fused *** excellent performance in its practical application is afurther demonstration that the fused data are of highquality.

关键词： data fusion South China Sea BP-ANN model