检索结果-南通市图书馆

Divergent growth trends and climatic response of Picea obovata along elevational gradient in Western Sayan mountains, Siberia

引用

Journal of Mountain Science 2018年第11期15卷 2378-2397页

作者： Elena BABUSHKINA Liliana BELOKOPYTOVA dina ZHIRNOVA Anna BARABANTSOVA Eugene VAGANOV Khakass Technical Institute Siberian Federal University Abakan 555017 Russia National Park "Shushensky Bor" Shushenskoe 662710 Russia Siberian Federal University Krasnoyarsk 660041 Russia Sukachev Institute of Forest Siberian Branch of Russian Academy of Sciences Krasnoyarsk 660036 Russia

In mountain ecosystems,plants are sensitive to climate changes,and an entire range of species distribution can be observed in a small ***,mountains are of great interest for climate–growth relationship *** this study,the Siberian spruce’s(Picea obovata Ledeb.)radial growth and its climatic response were investigated in the Western Sayan Mountains,near the SayanoShushenskoe *** was performed at three sites along an elevational gradient:at the lower border of the species range,in the middle,and at the *** of growth trends between individual trees was observed at each site,with microsite landscape-soil conditions as the most probable driver of this *** analysis of individual tree-ring width series based on inter-serial correlation was carried out,resulting in two sub-set chronologies being developed for each *** chronologies appear to have substantial differences in their climatic responses,mainly during the cold *** response was not constant due to regional climatic change and the local influence of the nearby Sayano-Shushenskoe *** main response of spruce to growing season conditions has a typical elevational pattern expected in mountains:impact of temperature shifts with elevation from positive to negative,and impact of precipitation shifts in the opposite *** of trees,growing under more severe micro-conditions,are very sensitive to temperature during September–April and to precipitation during October–December,and they record both inter-annual and long-term climatic ***,it would be interesting to test if they indicate the Siberian High anticyclone,which is the main driver of these climatic factors.

关键词： Climate change Tree-ring width Growth trends Climate-growth relationship Picea obovata Elevational gradient

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Finite Groups of Spencer Height ≤ 3

引用

Algebra Colloquium 2015年第3期22卷 437-444页

作者： Wenbin Guo dina P. Andreeva Alexander N. Skiba School of Mathematical SciencesUniversity of Science and Technology of China Hefei 230026 China Department of Mathematics Francisk Skorina Gomel State University Gomel 246019 Belarus

In this paper, we describe the finite groups G in which every maximal chain M3 〈 M2 〈 M1 〈 M0 = G contains a proper subnormal subgroup of G.

关键词： finite group subnormal subgroup maximal chain Spencer height Schmidt group

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Degradation kinetics and mechanism of trace nitrobenzene by granular activated carbon enhanced microwave/hydrogen peroxide system

引用

Journal of Environmental Sciences 2013年第7期25卷 1492-1499页

作者： dina Tan Honghu Zeng Jie Liu Xiaozhang Yu Yanpeng Liang Lanjing Lu College of Environmental Science and Engineering Guilin University of Technology Guangxi Institute of Building Research & Design Guangxi Polytechnic of Construction

The kinetics of thedegradation of trace nitrobenzene （NB） by a granular activated carbon （GAC） enhanced microwave （MW）/hydrogen peroxide （H202 ） systemwas studied. Effects of pH, NB initial concentration and tert-butyl alcohol on the removal efficiencywere examined. Itwas found that the reaction rate fitswell to first-order reaction kinetics in the MW/GAC/H202 process. Moreover, GAC greatly enhanced thedegradation rate of NB inwater. Under a given condition （MW power300 W, H202dosage 10 mg/L, pH 6.85 and temperature （60 ± 5）°C）, thedegradation rate of NBwas 0.05214 min 1when4 g/L GACwas added. In general, alkaline pHwas better for NBdegradation; however, the optimum pHwas 8.0 in the tested pH value range of4.0-12.0. At H202dosage of 10 mg/L and GACdosage of4 g/L, the removal of NBwasdecreasedwith increasing initial concentrations of NB, indicating that a low initial concentrationwas beneficial for thedegradation of NB. These results indicated that the MW/GAC/H202 processwas effective for trace NBdegradation inwater. Gas chromatography-mass spectrometry analysis indicated that a hydroxyl radical addition reaction anddehydrogenation reaction enhanced NBdegradation.

关键词： microwave granular activated carbon hydrogen peroxide nitrobenzene hydroxyl radicals

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Breeding Enrichment of Genetic Variation of Grain Yield and Its Attributes in Bread Wheat under Drought Stress and Well Irrigation

引用

Phyton-International Journal of Experimental Botany 2022年第12期91卷 2699-2717页

作者： dina Swelam Abdel Hamid Salem Manal Hassan Mohammed Ali Wheat Research Department Agricultural Research CenterGiza12619Egypt Agronomy Department Faculty of AgricultureZagazig UniversityZagazig44519Egypt

Drought stress(DS)is one of the most critical environmental abiotic stresses for wheat production in the arid *** of high-yielding genotypes tolerant to DS can play a significant role in mitigation the negative impacts associated with *** the present study,generation means analysis(GMA)was used to study the performance of two crosses under well irrigation(WI)and deficit irrigation[cross I(Line 44×Shandweel-1)and cross II(Line 20×Sakha 93)].Significant differences were observed for days to heading(DH),days to maturity(DM),plant height(PH),spike length(SL),number of spikes per plant(NS/P),number of grains per spike(NG/S),thousand-grain weight(TGW),grain yield per plant(GY/P),and proline content(PC)in the six populations of the two crosses within each irrigation *** II had early maturity and the highest PC,NS/P,TGW,and GY/P regardless of the irrigation *** I showed positive significant relative heterosis and heterobeltiosis for GY/P under the two irrigation *** inheritance of characters of cross I revealed additive,dominant,and epistatic effects,which varied with trait and *** genetic effects predominated in DH,SL,and PC,while non-additive were found in DM,NS/P,NG/S,and GY/***-sense heritability estimates(h^(2) n)were high for DH and PC,moderate to high for PH and SL,moderate for DM,NG/S,NS/P,and TGW,and low for GY/*** on different drought indices the populations BC_(1),BC_(2),F_(1),and P1 of cross II and BC1 of cross I were more tolerant to drought ***,PC,TGW and DH can be used as selection indicators to improve wheat for drought tolerance in early generations and other yield components traits in late *** second cross(Line 20×Sakha 93)shows promise and is of interest to a drought tolerance breeding program,where wheat breeders can use recombinant breeding strategies to construct desirable drought stress *** and path coefficient revealed that TGW and PC were the main

关键词： Drought generation mean analysis heterosis heritability wheat

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Structure and luminescence properties of color-tunable phosphor Sr_(2)La_(3)(SiO_(4))_(3)F:Tb^(3+),Sm^(3+)

引用

稀土学报:英文版 2023年第9期41卷 1288-1294,I0001页

作者： Haikun Liu Kun Nie Yuanyuan Zhang Lefu Mei dina V.Deyneko Xiaoxue Ma Department of Energy and Chemical Engineering Dongguan University of TechnologyDongguan 523808China State Key Laboratory of New Textile Materials&Advanced Processing Technology and Hubei Key Laboratory for New Textile Materials and Applications School of Materials Science and EngineeringKey Laboratory of Polyphenylene Sulfide Fiber and Application in Textile IndustryWuhan Textile UniversityWuhan430200China Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Sciences and TechnologyChina University of GeosciencesBeijing 100083China School of Materials Sciences and Technology Dongguan University of TechnologyDongguan 523808China School of Materials Science and Engineering Xi'an Jiaotong UniversityXi'an 710049China Department of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia Laboratory of Arctic Mineralogy and Material Sciences Kola Science CentreRussian Academy of Sciences14 Fersman Str.184209ApatityRussia

A series of single-phase and color-tunable phosphors Sr_(2)La_(3)(SiO_(4))_(3)F:0.15Tb^(3+),xSm^(3+)(SLSOF:0.15Tb^(3+),xSm^(3+)) was prepared using solid-state *** X-ray diffraction(XRD) was used to characterize the phase of the as-prepared *** synthesized phosphors have apatite-type structure without other ***^(3+) and Tb^(3+) ions substitute La^(3+) into the lattice and form a single-phase solid *** elements are evenly distributed in the sample according to the scanning electron microscopy(SEM) *** crystal structure of the host phosphor was refined by the Rietveld *** optical properties were studied in detail by investigation of the luminescence and diffuse spectra,fluorescence decay curves and energy transfer *** phosphor color can be changed from green(0.29,0.48) to yellow/orange and red(0.57,0.42) via adjusting the doping ratio of Sm^(3+).The SLSOF:0.15Tb^(3+),xSm^(3+)phosphors can emit typical multicolor light such as green,yellow,orange and red with gradually increasing Sm^(3+)doping *** results indicate the occurrence of the energy transfer which results in the color-tunable properties of the phosphors.

关键词： Apatite Calcination Phosphor Optical property Luminescence Rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rethinking bioequivalence and equivalence requirements of orally inhaled drug products

引用

Asian Journal of Pharmaceutical Sciences 2015年第6期10卷 461-471页

作者： dina Al-Numani Philippe Colucci Murray P.Ducharme Learn and Confirm Inc. St-LaurentQCCanada Facultéde Pharmacie University of MontrealMontrealQCCanada1

Orally inhaled drug products(OIPs),such as corticosteroids and bronchodilators,are at the forefront of asthma and chronic obstructive pulmonary disease treatments,two diseases that afflict worldwide *** generics of these products is essential,as the pricing of these medications remain a barrier to adequate patient ***,there is no consensus between regulatory bodies as to the bioequivalence and equivalence requirements of OIPs that are intended for local action in the *** manuscript critically reviews these requirements and presents future directions for clinicians,scientists,and regulators to consider to optimize the development and approval of OIPs.

关键词： Inhalation products Pharmacokinetics Pharmacodynamics Bioequivalence Therapeutic equivalence Clinical endpoint studies

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Latency-Aware Dynamic Second Offloading Service in SDN-Based Fog Architecture

引用

Computers, Materials & Continua 2023年第4期75卷 1501-1526页

作者： Samah Ibrahim AlShathri dina S.M.Hassan Samia Allaoua Chelloug Information Technology Department College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh84428Saudi Arabia

Task offloading is a key strategy in Fog Computing (FC). Thedefinition of resource-constrained devices no longer applies to sensors andInternet of Things (IoT) embedded system devices alone. Smart and mobileunits can also be viewed as resource-constrained devices if the power, cloudapplications, and data cloud are included in the set of required resources. Ina cloud-fog-based architecture, a task instance running on an end device mayneed to be offloaded to a fog node to complete its execution. However, ina busy network, a second offloading decision is required when the fog nodebecomes overloaded. The possibility of offloading a task, for the second time,to a fog or a cloud node depends to a great extent on task importance, latencyconstraints, and required resources. This paper presents a dynamic service thatdetermines which tasks can endure a second offloading. The task type, latencyconstraints, and amount of required resources are used to select the offloadingdestination node. This study proposes three heuristic offloading *** algorithm targets a specific task type. An overloaded fog node can onlyissue one offloading request to execute one of these algorithms accordingto the task offloading priority. Offloading requests are sent to a SoftwareDefined Networking (SDN) controller. The fog node and controller determinethe number of offloaded tasks. Simulation results show that the average timerequired to select offloading nodes was improved by 33% when compared tothe dynamic fog-to-fog offloading algorithm. The distribution of workloadconverges to a uniform distribution when offloading latency-sensitive nonurgenttasks. The lowest offloading priority is assigned to latency-sensitivetasks with hard deadlines. At least 70% of these tasks are offloaded to fognodes that are one to three hops away from the overloaded node.

关键词： Fog computing offloading algorithm latency-aware software defined networking SDN

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

热-机械协同活化铜尾矿水化胶凝性能研究

引用

中国矿业 2024年第2期33卷 149-158页

作者：李春辉伊元荣刘伟李洁史星丽迪娜·加阿拜新疆大学生态与环境学院新疆乌鲁木齐830046 新疆绿洲生态教育部重点实验室新疆乌鲁木齐830046 新疆精河温带荒漠生态系统教育部野外科学观测研究站新疆乌鲁木齐830046

铜尾矿是铜矿经过一系列工艺选矿完成后剩下的颗粒直径较小的沙粒,其堆存会带来诸多环境问题。铜尾矿结晶度高、活性低,许多研究人员探究激发活性后的铜尾矿作为混凝土等材料的辅料,但利用率较低。本文通过热-机械协同活化的方式激发铜... 详细信息

铜尾矿是铜矿经过一系列工艺选矿完成后剩下的颗粒直径较小的沙粒,其堆存会带来诸多环境问题。铜尾矿结晶度高、活性低,许多研究人员探究激发活性后的铜尾矿作为混凝土等材料的辅料,但利用率较低。本文通过热-机械协同活化的方式激发铜尾矿的活性,分析活性铜尾矿水化胶凝性能,依据抗压强度、粒径分布及矿相成分微观结构变化分析水化反应效果。在此基础上,采用X射线衍射仪(XRD)、傅立叶变换红外光谱(FT-IR)和电子扫描电镜(SEM)对铜尾矿胶凝性能进行分析。研究结果表明:热-机械协同活化激发铜尾矿活性的力学性能有了很大提升,即铜尾矿在600℃、机械球磨时间80 min条件下,活性由5.60%上升至89.91%,抗压强度为10.87 MPa;XRD和FT-IR进一步分析出活化铜尾矿多处产生了水化C—S—H凝胶、N—A—S—H凝胶、钙矾石等胶凝物质,其形状多呈现絮凝状、棉团状及短棒状。本文研究为铜尾矿的进一步利用提供理论支撑。

关键词：铜尾矿热-机械协同活性激发水化胶凝性能

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

HLR-Net: A Hybrid Lip-Reading Model Based on Deep Convolutional Neural Networks

引用

Computers, Materials & Continua 2021年第8期68卷 1531-1549页

作者： Amany M.Sarhan Nada M.Elshennawy dina M.Ibrahim Department of Computers and Control Engineering Faculty of EngineeringTanta UniversityTanta37133Egypt Department of Information Technology College of ComputerQassim UniversityBuraydah51452Saudi Arabia

Lip reading is typically regarded as visually interpreting the speaker’s lip movements during the *** is a task of decoding the text from the speaker’s mouth *** paper proposes a lip-reading model that helps deaf people and persons with hearing problems to understand a speaker by capturing a video of the speaker and inputting it into the proposed model to obtain the corresponding *** deep learning technologies makes it easier for users to extract a large number of different features,which can then be converted to probabilities of letters to obtain accurate *** proposed methods for lip reading are based on sequence-to-sequence architectures that are designed for natural machine translation and audio speech ***,in this paper,a deep convolutional neural network model called the hybrid lip-reading(HLR-Net)model is developed for lip reading from a *** proposed model includes three stages,namely,preprocessing,encoder,and decoder stages,which produce the output *** inception,gradient,and bidirectional GRU layers are used to build the encoder,and the attention,fully-connected,activation function layers are used to build the decoder,which performs the connectionist temporal classification(CTC).In comparison with the three recent models,namely,the LipNet model,the lip-reading model with cascaded attention(LCANet),and attention-CTC(A-ACA)model,on the GRID corpus dataset,the proposed HLR-Net model can achieve significant improvements,achieving the CER of 4.9%,WER of 9.7%,and Bleu score of 92%in the case of unseen speakers,and the CER of 1.4%,WER of 3.3%,and Bleu score of 99%in the case of overlapped speakers.

关键词： lip-reading visual speech recognition deep neural network connectionist temporal classification

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A systematic review:Detecting phishing websites using data mining models

引用

Intelligent and Converged Networks 2023年第4期4卷 326-341页

作者： dina Jibat Sarah Jamjoom Qasem Abu Al-Haija Abdallah Qusef the Department of Business Intelligence Technology Princess Sumaya University for TechnologyAmman 11941Jordan the Department of Cybersecurity Princess Sumaya University for TechnologyAmman 11941Jordan the Department of Software Engineering Princess Sumaya University for TechnologyAmman 11941Jordan

As internet technology use is on the rise globally,phishing constitutes a considerable share of the threats that may attack individuals and organizations,leading to significant losses from personal and confidential information to substantial financial ***,much research has been dedicated in recent years to developing effective and robust mechanisms to enhance the ability to trace illegitimate web pages and to distinguish them from non-phishing sites as accurately as *** to conclude whether a universally accepted model can detect phishing attempts with 100%accuracy,we conduct a systematic review of research carried out in 2018-2021 published in well-known journals published by Elsevier,IEEE,Springer,and *** researchers studied different Data Mining(DM)algorithms,some of which created a whole new model,while others compared the performance of several *** studies combined two or more algorithms to enhance the detection *** reveal that while most algorithms achieve accuracies higher than 90%,only some specific models can achieve 100%accurate results.

关键词： phishing data mining machine learning algorithm classification

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：