检索结果-南通市图书馆

Statistical distribution of nonlinear random wave height in shallow water

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china Earth {1. 2010年第12期53卷 267-273页

作者： hou {1.1,DUAN YongLiang1.2.CHEN GengXin1.2.qi peng1,song guiting1 & SI GuangCheng{1.1.Institute of oceanology,chinese academy of sciences,qingdao 2.6071.china 2 Graduate University of chinese academy of sciences,Beijing 100049,china 1. Institute of oceanology Chinese Academy of Sciences Qingdao 266071 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China

Here we present a statistical model of random wave,using Stokes wave theory of water wave dynamics,as well as a new nonlinear probability distribution function of wave height in shallow *** is more physically logical to use the wave steepness of shallow water and the factor of shallow water as the parameters in the wave height *** results indicate that the two parameters not only could be parameters of the distribution function of wave height but also could reflect the degree of wave height distribution deviation from the Rayleigh *** new wave height distribution overcomes the problem of Rayleigh distribution that the prediction of big wave is overestimated and the general wave is *** prediction of small probability wave height value of new distribution is also smaller than that of Rayleigh *** effect of wave steepness in shallow water is similar to that in deep water;but the factor of shallow water lowers the wave height distribution of the general wave with the reduced factor of wave *** also makes the wave height distribution of shallow water more *** results indicate that the new distribution fits the in situ measurements much better than other distributions.

关键词： wave height distribution nonlinearity the wave steepness of shallow water the factor of shallow water

同方期刊数据库

Structural Features and Molecular Evolution of Bowman-Birk Protease Inhibitors and Their Potential Application

在线全文

学校读者我要写书评

暂无评论

Acta Biochimica et Biophysica Sinica 2005年第5期37卷 283-292页

作者： Rui-Feng qi~(1.2. Zhan-Wu {1.~1.Cheng-Wu CHI~(2.3). 1.College of Life Science, Northwest Normal University, Lanzhou 730070, china: 2 Institute of Biochemistry and Cell Biology, chinese academy of sciences, Shanghai 200031. china 3 Institute of Protein Research, Tongji University, Shanghai 200092, china CollegeofLifeScience NorthwestNormalUniversityLanzhou730070China

The Bowman-Birk inhibitors(BBIs)are well-studied serine protease inhibitors that areabundant in dicotyledonous and monocotyledonous *** from dicots usually have a molecular weightof 8k and are double-headed with two reactive sites,whereas those from monocots can be divided into twoclasses,one approximately 8 kDa in size with one reactive site(another reactive site was lost)and the otherapproximately 1. kDa in size with two reactive *** reactive site is located at unique exposed surfacesformed by a disulfide-linked β-sheet loop that is highly conserved,rigid and mostly composed of *** structural features and molecular evolution of inhibitors are described,focusing on the conserveddisulfide *** sunflower trypsin inhibitor-1.SFTI-1.,with 1. amino acid residues,is a recentlydiscovered bicyclic inhibitor,and is the most small and potent naturally occurring Bowman-Birk ***,BBIs have become a hot topic because of their potential *** are now used fordefense against pathogens and insects in transgenic plants,which has advantages over using toxic andpolluting *** could also be applied in the prevention of cancer,Dengue fever,and inflammatoryand allergic disorders,because of their inhibitory activity with respect to the serine proteases that play apivotal role in the development and pathogenesis of these *** canonical nine-residue loop of BBIs/STFI-1.provides an ideal template for drug design of specific inhibitors to target their respective proteases.

关键词： Bowman-Birk protease inhibitor sunflower trypsin inhibitor-1.SFTI-1. molecular evolution drug design

基于深度学习、小波变换和可见光谱的茶树冻害程度评估

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

光谱学与光谱分析 2024年第1期44卷 234-240页

作者：李赫王玉范凯毛艺霖丁仕波宋大鹏王梦琪丁兆堂山东省农业科学院茶叶研究所山东济南250108 青岛农业大学茶叶研究所山东青岛266109 日照市农业科学研究院茶叶研究所山东日照276827

茶树冻害鉴定是评价茶树抗逆性、指导茶园越冬管理的基础。茶树冻害鉴定的传统方法主要通过人工观察茶树叶片的冻害数量和冻害程度,存在准确率低,效率低,主观性强等缺点。提出一种基于深度学习、小波变换和可见光谱的茶树冻害程度评估... 详细信息

茶树冻害鉴定是评价茶树抗逆性、指导茶园越冬管理的基础。茶树冻害鉴定的传统方法主要通过人工观察茶树叶片的冻害数量和冻害程度,存在准确率低,效率低,主观性强等缺点。提出一种基于深度学习、小波变换和可见光谱的茶树冻害程度评估框架。首先,采集了1.000张茶树受冻后的树冠图像,并且按照4∶1.为训练集和测试集,并对训练集图像的冻害叶片进行标注。其次,采用Faster R-CNN网络对茶树的冻害叶片进行识别提取,并且分别选择了AlexNet、 VGG1.和ResNet50三种特征提取器,选择鲁棒性最高的特征提取器作为主干网络。然后,将提取到的茶树冻害叶片图像进行小波变换增强处理,从而得到了一张低频率和三张高频率的图像。将小波变换处理后的图像和未经小波变换处理的图像分别输入到VGG1.、 SVM、 AlexNet、 ResNet50等网络对冻害叶片进行分级,比较四种网络的分类性能。根据冻害叶片的数量、冻害叶片的程度,不同冻害程度叶片的权重系数,对茶树受冻程度打分,从而对茶树整体的冻害程度进行评估。结果表明:(1.基于ResNet50的Faster R-CNN模型提取茶树冻害叶片的性能最好,其查准率为93.33%,查全率为92.57%,高于VGG1.和AlexNet作为主干网络的识别性能,可以确保大多数的冻害叶片都能被提取出来,并为叶片的冻害程度进一步分级提供基础。(2)VGG1.模型分类不同冻害程度的叶片的整体准确率为89%,高于其他模型(SVM、 AlexNet、 ResNet50)的整体分类准确率,表明VGG1.模型具有较高的鲁棒性。(3)小波变换处理后的冻害叶片图像与未经小波变换处理后的冻害叶片相比较,能提升模型的整体分类准确率2%~6%。说明小波变换增强技术可以提高网络的准确率。因此,本实验框架可以准确和高效地将茶树冻害叶片进行分级,对于茶园冻害程度的评估具有重要价值,为北方茶园的越冬防护提供技术支撑。

关键词：茶树冻害叶片 Faster R-CNN VGG1. 小波变换

Differential tectonic evolution and formation mechanism of three subsags in Wenchang Sag of Pearl River Mouth Basin,South china Sea

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2023年第3期20卷 1379-1394页

作者： qiu-Gen Zheng Jun-Liang Li Bao-Hua Lei peng {1. qi Li De-Feng Shi Hao Liu Chang-{1. Lin School of Ocean sciences China University of Geosciences(Beijing)Beijing100083China Hainan Branch of the china National Ofshore Oil Corporation HaikouHainan570311China qingdao Institute of Marine Geology QingdaoShandong266237China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Scence and Technoogy(Qingdao)QingdaoShandong26637China

Notable differences in the structural characteristics and evolution of three adjacent sub-sags,i.e.,the Wenchang sub-sags A,B,and C,on the downthrown side of the Zhu IlI South Fault in the Wenchang Sag,are significant as they affect the formation and distribution of the oil and gas in these three ***,the differences in their tectonic evolutions and formation mechanisms have not yet been adequately *** this paper,stress analysis,equilibrium profiles,and paleogeomorphic restora-tion,are used to investigate the dynamic settings,formation mechanisms,and influencing factors of the structural deformation related to the formation of the Wenchang Sag based on interpretation of seismic *** results of the stress analysis suggest clockwise deflection of the regional tensile stress direction from a WNW-ESE trend during the Early Paleocene to NW-SE and NNW-SSE trends during the Eocene,to a nearly N-S trend during the Oligocene,and finally to a NNE-SSW trend during the *** clockwise rotation of the regional tensile stress direction led to the formation of a dextral strike-slip stress component parallel to the NE-trending Zhu I South *** strike-slip stress component formed a releasing bend in sub-sag A,and may be associated with the continuous subsidence of a thick sedimentary layer in sub-sag *** also created a restraining bend in sub-sag B,which underwent multiple structural inversions during its extension and subsidence and has a relatively s mall sedimentary *** double restraining bend in sub-sag C is considered to have been strongly uplifted and eroded in response to this strike-slip stress *** obvious structural inversions in sub-sag B are iden-tified in this *** structural inversions correspond to the last four regional tectonic *** interpretation suggests that the formation of the structural inversions was likely related to the strong tensile stress and the small intersection angle between

关键词： Strike-slip stress Releasing bend Restraining bend Double restraining bend Structura linversion ZhuⅢSouthfault Wenchang sag Northern South china Sea

纤维素、木质素降解菌的筛选及对菌渣堆肥的影响

在线全文

学校读者我要写书评

暂无评论

河南农业科学 2024年第9期53卷 66-79页

作者：王献鑫祁丽桦宋江富张庆格刘丛丛张奇宋菲菲徐爱玲青岛理工大学环境与市政工程学院山东青岛266520 青岛绿色家园生物科技发展有限公司山东青岛266417 青岛洁宝生态科技有限公司山东青岛266109

为筛选能促进食用菌菌渣堆肥过程中纤维素、木质素降解的高效复合菌,采用羧甲基纤维素钠平板法、刚果红染色法、木质素平板法从菌渣废弃物中对其进行初筛,结合滤纸条崩解试验、苯胺蓝脱色率测定以及纤维素、木质素酶活力测定试验对其进... 详细信息

为筛选能促进食用菌菌渣堆肥过程中纤维素、木质素降解的高效复合菌,采用羧甲基纤维素钠平板法、刚果红染色法、木质素平板法从菌渣废弃物中对其进行初筛,结合滤纸条崩解试验、苯胺蓝脱色率测定以及纤维素、木质素酶活力测定试验对其进行复筛,之后将其用于好氧堆肥试验,研究该过程中物料理化参数和微生物群落变化,评估其对菌渣纤维素、木质素的降解能力。结果表明,富集得到的纤维素降解菌,6 d内可将滤纸条完全降解,羧甲基纤维素酶(CMCase)、滤纸酶(FPA)、外切葡聚糖酶(C1.和β-葡萄糖苷酶(β-Gase)活力分别达到2.50、7.30、3.43、2.90 U/mL;富集得到的木质素降解菌5 d内苯胺蓝脱色率最大值达92.1.%,木质素过氧化物酶(Lac)、漆酶(Lip)和锰过氧化物酶(Mnp)活力分别达到0.80、2.42、1.35 U/mL。堆肥试验结果表明,与自然堆肥处理(CK处理)相比,添加纤维素、木质素2种降解菌处理(XM处理),堆体最高温度为58.77℃,高温(>55℃)持续5 d,纤维素、木质素相对分解率提高值分别为35.83%、54.33%。添加菌剂提高堆肥中期细菌群落丰富度,假单胞菌属(Pseudomonas)、海源菌属(Idiomarina)、谷氨酸杆菌属(Glutamicibacter)、硫代单胞菌属(Thiopseudomonas)、格鲁比卡氏菌属(Globicatella)、极小单胞菌属(Pusillimonas)、溶杆菌属(Lysobacter)、Brumimicrobium等微生物相对丰度增大。冗余分析(RDA)结果表明,温度、pH值、电导率(EC值)是影响堆肥试验中期细菌群落组成的显著因素。综上,筛选的复合降解菌可有效降解纤维素、木质素,并延长堆肥高温期。

关键词：降解菌纤维素木质素筛选菌渣堆肥试验细菌群落组成环境因子

维普期刊数据库博看期刊

Survey of Tetracyclines, Sulfonamides, Sulfamethazine, and Quinolones in UHT Milk in china Market

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2013年第7期12卷 1300-1305页

作者： HAN Rong-wei ZHENG Nan WANG Jia-qi ZHEN Yun-peng LI {1.-li YU Qun-li College of Food Science and Engineering Gansu Agricultural University State Key Laboratory of Animal Nutrition Institute of Animal Science Chinese Academy of Agricultural Sciences College of Food Science and Engineering Qingdao Agricultural University

This study surveyed 1.0 samples of ultra high temperature （UHT） milk of four top chinese dairy brands collected in the 25 cities in {1. in June 201., and assessed their contamination with antibiotics, using the ELISA method. The percentages of tetracyclines, sulfonamides, sulfamethazine, and quinolones detected in the samples were 0, 1..7, 40.6, and 1.0%, respectively. The maximum concentrations of the tetracyclines, sulfonamides, sulfamethazine and quinolones in UHT milk samples were 〈1.5, 26.2, 22.6, and 58.8 μg kg-1. respectively. None of the samples exceeded the maximum residue levels （MRLs） for these four veterinary drugs, according to the regulations set by {1., the European Union （EU） and the Codex Alimentarius Commission （CAC）.

关键词： survey tetracyclines sulfonamides sulfamethazine quinolones UHT milk china market

Effects of dopamine D1.receptor on the firing of globus pallidus neurons in normal rats

在线全文

学校读者我要写书评

暂无评论

Effects of dopamine D1 receptor on the firing of globus pall...

FIO-ESM v2.0 Outputs for the CMIP6 Global Monsoons Model Intercomparison Project Experiments

中国生理学会第23届全国会员代表大会暨生理学学术大会

作者： Rui qi,Lei CHEN~* Department of Physiology,qingdao University,qingdao 2.6071.china

The globus pallidus in rodents,equivalent to the external globus pallidus in primates,plays an important role in movement *** studies have shown that the globus pallidus receives dopamine innervation from the collaterals of nigrostriatal *** electrophysiological study has shown that systemic administration of D receptor agonist SKF38393 increased the spontaneous firing in normal *** microinjection of dopamine partially restores motor deficits in 6-OHDA parkinsonian rat *** the present study,we employed extracellular single unit recordings to study the effects of dopamine D receptor agonist SKF38393 in the globus pallidus of normal *** 25 out of 58 globus pallidus neurons,micro-pressure injection of 5 mmol/L SKF38393 increased the frequency of spontaneous firing rate from(9.8±1.9) Hz to(1..3±2.5) *** average increase was 61.5%±8.3%(P1..In another 1. out of 58 globus pallidus neurons,micro-pressure injection of 5 mmol/L SKF38393 decreased the frequency of spontaneous firing rate from(4.7±1.2. Hz to(2.1.0.6) *** average decrease was 52.1.±6.7%(P1.globus pallidus *** present findings may provide a rational reason for further investigations into the potential of pallidal dopamine D receptor in the treatment of Parkinson’s disease.

关键词： globus pallidus dopamine single unit recording

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Advances in Atmospheric sciences 2020年第10期37卷 1045-1056页

作者： Yajuan song Xinfang LI Ying BAO Zhenya song Meng WEI qi SHU and Xiaodan YANG First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Pilot National Laboratory for Marine Science and TechnologyQingdao 266000China Key Laboratory of Marine Science and Numerical Modeling Ministry of Natural ResourcesQingdao 266061China

Three tiers of experiments in the Global Monsoons Model Intercomparison Project(GMMIP),one of the endorsed model intercomparison projects of phase 6 of the Coupled Model Intercomparison Project(CMIP6),are implemented by the First Institute of Oceanography Earth System Model version 2(FIO-ESM v2.0),following the GMMIP *** of global mean surface air temperature from 1.70 to 201. and climatological precipitation(1.79–201.)in tier-1.shows that the atmosphere model of FIO-ESM v2.0 can reproduce the basic observed atmospheric *** tier-2,the internal variability is captured by the coupled model,with the SST restoring to the model climatology plus the observed anomalies in the tropical Pacific and North *** of the Northern Hemisphere summer monsoon circulation is significantly improved by the SST restoration in the North *** tier-3,five orographic perturbation experiments are conducted covering the period 1.79–201. by modifying the surface elevation or vertical heating in the prescribed *** particular,the strength of the South Asian summer monsoon is reduced by removing the topography or thermal forcing above 500 m over the Asian *** and daily simulated outputs of FIO-ESM v2.0 are provided through the Earth System Grid Federation(ESGF)node to contribute to a better understanding of the global monsoon system.

关键词： CMIP6 GMMIP FIO-ESM v2.0 global monsoon

Arctic sea ice concentration and thickness data assimilation in the FIO-ESM climate forecast system

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2021年第10期40卷 65-75页

作者： qi Shu Fangli qiao Jiping Liu Zhenya song Zhiqiang Chen Jiechen Zhao Xunqiang Yin Yajuan song First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key Laboratory of Marine Science and Numerical Modeling Ministry of Natural ResourcesQingdao 266061China Department of Atmospheric and Environmental sciences University at AlbanyState University of New YorkAlbanyNY 12222USA College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524088China National Marine Environmental Forecasting Center Beijing 100081China

To improve the Arctic sea ice forecast skill of the First Institute of Oceanography-Earth System Model(FIO-ESM)climate forecast system,satellite-derived sea ice concentration and sea ice thickness from the Pan-Arctic IceOcean Modeling and Assimilation System(PIOMAS)are assimilated into this system,using the method of localized error subspace transform ensemble Kalman filter(LESTKF).Five-year(201.–201.)Arctic sea ice assimilation experiments and a 2-month near-real-time forecast in August 201. were conducted to study the roles of ice data *** experiment results show that ice concentration assimilation can help to get better modeled ice concentration and ice *** the biases of ice concentration,ice cover,ice volume,and ice thickness can be reduced dramatically through ice concentration and thickness *** near-real-time forecast results indicate that ice data assimilation can improve the forecast skill significantly in the FIO-ESM climate forecast *** forecasted Arctic integrated ice edge error is reduced by around 1.3 by sea ice data *** with the six near-real-time Arctic sea ice forecast results from the subseasonal-toseasonal(S2 S)Prediction Project,FIO-ESM climate forecast system with LESTKF ice data assimilation has relatively high Arctic sea ice forecast skill in 201. summer sea ice *** sea ice thickness in the PIOMAS is updated in time,it is a good choice for data assimilation to improve sea ice prediction skills in the near-realtime Arctic sea ice seasonal prediction.

关键词： FIO-ESM sea ice data assimilation sea ice forecast