检索结果-南通市图书馆

Enhancing Hyper-Spectral Image Classification with Reinforcement Learning and Advanced Multi-Objective Binary Grey Wolf Optimization

引用

Computers, Materials & Continua 2024年第6期79卷 3469-3493页

作者： Mehrdad Shoeibi Mohammad Mehdi Sharifi nevisi Reza Salehi Diego Martín zahra Halimi Sahba Baniasadi TheWPI Business School Worcester Polytechnic InstituteWorcesterMassachusetts01609-2280USA Department of Industrial Engineering Iran University of Science and TechnologyNarmakTehran16846-13114Iran ETSI de Telecomunicación Universidad Politécnica de MadridAv.Complutense 30Madrid28040Spain Department of Civil and Environmental Engineering University of MarylandCollege ParkMaryland20742USA Department of Industrial Engineering College of EngineeringUniversity of HoustonHoustonTexas77204USA

Hyperspectral(HS)image classification plays a crucial role in numerous areas including remote sensing(RS),agriculture,and the monitoring of the *** band selection in HS images is crucial for improving the efficiency and accuracy of image *** process involves selecting the most informative spectral bands,which leads to a reduction in data *** on these key bands also enhances the accuracy of classification algorithms,as redundant or irrelevant bands,which can introduce noise and lower model performance,are *** this paper,we propose an approach for HS image classification using deep Q learning(DQL)and a novel multi-objective binary grey wolf optimizer(MOBGWO).We investigate the MOBGWO for optimal band selection to further enhance the accuracy of HS image *** the suggested MOBGWO,a new sigmoid function is introduced as a transfer function to modify the wolves’*** primary objective of this classification is to reduce the number of bands while maximizing classification *** evaluate the effectiveness of our approach,we conducted experiments on publicly available HS image datasets,including Pavia University,Washington Mall,and Indian Pines *** compared the performance of our proposed method with several state-of-the-art deep learning(DL)and machine learning(ML)algorithms,including long short-term memory(LSTM),deep neural network(Dnn),recurrent neural network(Rnn),support vector machine(SVM),and random forest(RF).Our experimental results demonstrate that the Hybrid MOBGWO-DQL significantly improves classification accuracy compared to traditional optimization and DL ***-DQL shows greater accuracy in classifying most categories in both datasets *** the Indian Pine dataset,the MOBGWO-DQL architecture achieved a kappa coefficient(KC)of 97.68%and an overall accuracy(OA)of 94.32%.This was accompanied by the lowest root mean square error(RMSE)of 0.94,indicating very precise

关键词： Hyperspectral image classification reinforcement learning multi-objective binary grey wolf optimizer band selection

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

An Innovative Approach Using TKn-Cryptology for Identifying the Replay Assault

引用

Computers, Materials & Continua 2024年第1期78卷 589-616页

作者： Syeda Wajiha zahra Muhammad nadeem Ali Arshad Saman Riaz Muhammad Abu Bakr Ashit Kumar Dutta Zaid Alzaid Badr Almutairi Sultan Almotairi Department of Computer Science Alhamd Islamic UniversityIslamabad44000Pakistan Department of Computer Science and Technology University of Science and Technology BeijingBeijing100083China Department of Computer Science National University of TechnologyIslamabad44000Pakistan Department of Electrical Engineering National University of TechnologyIslamabad44000Pakistan Department of Computer Science and Information Systems College of Applied SciencesAlMaarefa UniversityRiyadh13713Saudi Arabia Department of Computer Science Faculty of Computer and Information SystemsIslamic University of MadinahMedinah42351Saudi Arabia Department of Information Technology College of Computer Sciences and Information Technology CollegeMajmaah UniversityAl-Majmaah11952Saudi Arabia Department of natural and Applied Sciences Faculty of Community CollegeMajmaah UniversityMajmaah11952Saudi Arabia

Various organizations store data online rather than on physical *** the number of user’s data stored in cloud servers increases,the attack rate to access data from cloud servers also *** researchers worked on different algorithms to protect cloud data from replay *** of the papers used a technique that simultaneously detects a full-message and partial-message replay *** study presents the development of a TKn(Text,Key and name)cryptographic algorithm aimed at protecting data from replay *** program employs distinct ways to encrypt plain text[P],a user-defined Key[K],and a Secret Code[n].The novelty of the TKn cryptographic algorithm is that the bit value of each text is linked to another value with the help of the proposed algorithm,and the length of the cipher text obtained is twice the length of the original *** the scenario that an attacker executes a replay attack on the cloud server,engages in cryptanalysis,or manipulates any data,it will result in automated modification of all associated values inside the *** mechanism has the benefit of enhancing the detectability of replay ***,the attacker cannot access data not included in any of the papers,regardless of how effective the attack strategy *** the end of paper,the proposed algorithm’s novelty will be compared with different algorithms,and it will be discussed how far the proposed algorithm is better than all other algorithms.

关键词： Replay attack malware message attack file encryption cryptology data security

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

Gate-controlled supercurrent effect in dry-etched Dayem bridges of non-centrosymmetric niobium rhenium

引用

nano Research 2024年第7期17卷 6575-6581页

作者： Jennifer Koch Carla Cirillo Sebastiano Battisti Leon Ruf zahra Makhdoumi Kakhaki Alessandro Paghi Armen Gulian Serafim Teknowijoyo Giorgio De Simoni Francesco Giazotto Carmine Attanasio Elke Scheer Angelo Di Bernardo Department of Physics University of KonstanzUniversitätsstraße 1078464 KonstanzGermany CnR-Spin c/o Universitàdegli Studi di Salernovia Giovanni Paolo II 13284084 Fisciano(SA)Italy nEST Istituto Nanoscienze-CNR and Scuola Normale SuperiorePiazza San Silvestro 1256127 PisaItaly Dipartimento di Fisica“E.R.Caianiello” Universitàdegli Studi di SalernoVia Giovanni Paolo II 13284084 Fisciano(SA)Italy Advanced Physics Laboratory Institute for Quantum StudiesChapman UniversityBurtonsvilleMD 20866USA

The application of a gate voltage to control the superconducting current flowing through a nanoscale superconducting constriction,named as gate-controlled supercurrent(GCS),has raised great interest for fundamental and technological *** gain a deeper understanding of this effect and develop superconducting technologies based on it,the material and physical parameters crucial for the GCS effect must be ***-down fabrication protocols should also be optimized to increase device scalability,although studies suggest that top-down fabricated devices are more resilient to show a ***,we investigate gated superconducting nanobridges made with a top-down fabrication process from thin films of the noncentrosymmetric superconductor niobium rhenium with varying ratios of the constituents(nbRe).Unlike other devices previously reported and made with a top-down approach,our nbRe devices systematically exhibit a GCS effect when they were fabricated from nbRe thin films with small grain size and etched in specific *** observations pave the way for the realization of top-down-made GCS devices with high *** results also imply that physical parameters like structural disorder and surface physical properties of the nanobridges,which can be in turn modified by the fabrication process,are crucial for a GCS observation,providing therefore also important insights into the physics underlying the GCS effect.

关键词： superconductivity non-centrosymmetric superconductors superconducting devices gated devices gate-controlled supercurrent top-down fabrication

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

Phytochemistry and biological activities of Heracleum persicum: a review

引用

Journal of Integrative Medicine 2018年第4期16卷 223-235页

作者： zahra Majidi S.n.Sadati Lamardi Department of Traditional Pharmacy School of Traditional Medicine Tehran University of Medical Sciences

Heracleum persicum Desf. ex Fisch is used in Iranian traditional medicines, for the treatment of various diseases including neurological, gastrointestinal, respiratory, rheumatological and urinary tract diseases. In phytochemical analysis of H. persicum, several classes of natural chemicals including volatile （aliphatic esters, carbonyls, phenyl propenes and terpenes） and nonvolatile （flavonoids, furanocoumarins, tannins and alkaloids） constituents as well as different minerals have been identified. Scientific studies on H. persicum proved that it has a wide range of biological and pharmacological activities. This article has provided comprehensive information on Iranian traditional uses, phytochemistry and pharmacolog- ical activities of H. persicum.

关键词： Colpar heracleum persicum Pharmacology phytochemistry

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

High photocatalytic efficiency of spouting reactor compared with fluidized bed with top irradiation source

引用

Particuology 2017年第4期15卷 123-128页

作者： Hadi Mansoubi zahra Mansourpour Shohreh Fatemi School of Chemical Engineering College of Engineering University of Tehran Tehran lran

The removal of volatile organic compounds by photocatalytic degradation is one of the safest and most effective ways of removing pollutants from the air. This process is highly affected by the type of reactor, light exposure, and hydrodynamics. For scale up purposes, continuous reactors with high capacity are required for treating large amounts of feedstock. In this work, two types of reactors based on different hydrodynamics, fluidized and spouted reactors, were designed to work under light irradiation inside the reactor. The efficiency of the reactors for volatile organic compound removal from high flow rates of air under Hg lamp irradiation using n-F-TiO2 photocatalyst was investigated. The performance of the fluidized bed and spouted bed were evaluated and compared at the same weight hourly space velocity of feed stream through the reactor. The results revealed that 80% of the initial acetaldehyde was removed in the fluidized bed after about 200 min, while in the spouted bed the acetaldehyde was totally removed after about 120 min.

关键词： Spouted bed reactor Photocatalyst powder VOC removal High efficiency Fluidized bed reactor n-F TiO2

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

Synthesis of mesoporous silica/iron oxide nanocomposites and application of optimum sample as adsorbent in removal of heavy metals

引用

Rare Metals 2017年第12期36卷 942-950页

作者： Shirin Kalantari Mardali Yousefpour zahra Taherian Faculty of Materials and Metallurgical Engineering Semnan University Semnan 35131-19111 Iran

In this study, mesoporous silica/iron oxide nanocomposite(MCM-FeO) was synthesized via hydrothermal technique. The chemical synthesis of MCM-FeOnanocomposite was achieved at 18 h. The effect of concentration of tetraethylorthosilicate(TEOS) on nanocomposites properties was studied during synthesis process. For this purpose, 0.5, 1.5, 2.5, 3.5, and 4.5 ml tetraethylorthosilicate(TEOS) were selected, respectively. The textural properties and microstructure of the nanocomposites were characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), field emission scanning electron microscopy(FESEM), nadsorption-desorption, and vibrating sample magnetometer(VSM) analysis. Results show that the nanocomposite with tetraethylorthosilicate(TEOS)/cetyltrimethylammonium bromide(CTAB) ratio of 5 exhibits large surface areas(461.19 m~2·g). Furthermore, this nanocomposite shows superparamagnetic behavior under external magnetic field compared to other samples. Moreover, results of removal of metal ions indicate that adsorption of ni(II), Cd(II), Cr(III),Zn(II), and Pb(II) ions on the surface of adsorbent(nanocomposite) increases with the increase in solution pH, contact time,and adsorbent dosage. Furthermore, the maximum removal rates of heavy metals ions reach 53.0 %, 79.0 %, 61.0 %,89.0 %, and 99.5 % at pH of 5, time of 50 min, and the weight of adsorbent of 0.16 with 2.5 ml TEOS, respectively.

关键词： Interfaces Adsorption nanocomposite Amorphous materials Oxides

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

High efficiency visible-light-driven Fe_2O_3-xS_x/S-doped g-C_3n_4 heterojunction photocatalysts: Direct Z-scheme mechanism

引用

Journal of Materials Science & Technology 2018年第9期34卷 1511-1525页

作者： Milad Jourshabani zahra Shariatinia Alireza Badiei Department of Chemistry Amirkabir University of Technology (Tehran Polytechnic) School of Chemistry College of Science University of Tehran nanobiomedicine Center of Excellence Nanoscience and Nanotechnology Research Center University of Tehran

Several nanoporous Fe2 O3-xSx/S-doped g-C3 n4（CnS） Z-scheme hybrid heterojuctions have been successfully synthesized by one-pot in situ growth of the Fe2O3-xSx particles on the surface of CnS. The characterization results show that S-doping in the g-C3 n4 backbone can greatly enhance the charge mobility and visible light harvesting capability. In addition, porous morphology of hybrid composite provides available open pores for guest molecules and also improves light absorbing property due to existence of multiple scattering effects. More importantly, the Fe2 O3-xSx nanoparticles formed intimate heterojunction with CnS and developed the efficient charge transfer by extending interfacial interactions occurred at the interfaces of both components. It has been found that the Fe2 O3-xSx/CnS composites have an enhanced photocatalytic activity under visible light irradiation compared with isolated Fe2 O3 and CnS components toward the photocatalytic degradation of methylene blue（MB）. The optimal loaded Fe2 O3-xSx value obtained is equal to 6.6 wt% that provided 82% MB photodegradation after 150 min with a reaction rate constant of 0.0092 min（-1） which was faster than those of the pure Fe2 O3（0.0016 min（-1））and CnS（0.0044 min（-1）） under the optimized operating variables acquired by the response surface methodology. The specific surface area and the pore volume of Fe2 O3（6.6）/CnS hybrid are 33.5 m2/g and0.195 cm3/g, which are nearly 3.8 and 7.5 times greater compared with those of the CnS, respectively. The TEM image of Fe2 O3（6.6）/CnS nanocomposite exhibits a nanoporous morphology with abundant uniform pore sizes of around 25 nm. Using the Mott-Schottky plot, the conduction and valence bands of the CnS are measured（at pH = 7） equal to-1.07 and 1.48 V versus normal hydrogen electrode（nHE）, *** tests prove that ·OH-and ·O2-radicals are major active species in the photocatalytic *** has been established that formation of the Z-scheme Fe2 O3（6.6）/CnS he

关键词： Visible light irradiation nanophotocatalyst in situ S-doping Z-scheme heterojunction Response surface methodology(RSM)

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

Synthesis of nanocrystalline γ-Al_2O_3 by sol-gel and precipitation methods for methanol dehydration to dimethyl ether

引用

Journal of natural Gas Chemistry 2011年第2期20卷 128-134页

作者： zahra Hosseini Majid Taghizadeh Fereydoon Yaripour Chemical Engineering Department Babol University of Technology Catalyst Research Group Petrochemical Research and Technology Company NPC

The capability of sol-gel and conventional precipitation techniques for the synthesis of nanocrystalline γ-alumina was investigated. These catalysts were used for vapor-phase dehydration of methanol to dimethyl ether in a fixed-bed reactor under the same operating conditions （T = 300 ？C, P = 1 bar, LHSV = 2.8, 11.7, 26.1 h？1） and characterized by means of n2 adsorption-desorption, nH3-TPD, XRD, TGA and SEM techniques. According to the experimental results, the catalysts prepared using sol-gel method in non-aqueous medium showed better performance compared with those prepared by other methods.

关键词： γ-Al2O3 sol-gel precipitation methanol dehydration dimethyl ether

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

Impact of pertinent parameters on foam behavior in the entrance region of porous media:mathematical modeling

引用

Petroleum Science 2020年第6期17卷 1669-1682页

作者： Fereshteh Samimi zahra Sakhaei Masoud Riazi Department of Chemical Engineering School of Chemical and Petroleum EngineeringShiraz UniversityShirazIran Enhanced Oil Recovery(EOR)Research Centre IOR/EOR Research InstituteShiraz UniversityShirazIran Petroleum Engineering Department School of Chemical and Petroleum EngineeringShiraz UniversityShirazIran

Foam injection is a promising solution for control of mobility in oil and gas field exploration and development,including enhanced oil recovery,matrix-acidization treatments,contaminated-aquifer remediation and gas leakage *** study presents a numerical investigation of foam behavior in a porous *** flow method is applied to describe steady-state foam displacement in the entrance *** this model,foam flow for the cases of excluding and including capillary pressure and for two types of gas,nitrogen(n2)and carbon dioxide(CO2)are *** of pertinent parameters are also *** indicate that the foam texture strongly governs foam flow in porous *** entrance region may be quite different for foam texture to accede local equilibrium,depending on the case and physical properties that are *** to the fact that the aim of foaming of injected gas is to reduce gas mobility,results show that CO2 is a more proper injecting gas than *** are also some ideas presented here on improvement in foam displacement *** study will provide an insight into future laboratory research and development of full-field foam flow in a porous medium.

关键词： Foam displacement Entrance region Fractional flow method Foam texture Water saturation Mathematical modeling

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

Fabrication of an electrochemical sensor for determination of doxorubicin in human plasma and its interaction with DnA

引用

Journal of Pharmaceutical Analysis 2017年第1期7卷 27-33页

作者： Reza Hajian zahra Tayebi nafiseh Shams Young Researchers and Elite Club Gachsaran Branch Islamic Azad University 75818-63876 Gachsaran Iran Department of Chemistry College of Science Gachsaran Branch Islamic Azad University 75818-63876 Gachsaran Iran Institute of Advanced Technology Universiti Putra Malaysia 43400 Serdang Selangor Malaysia

In this work, an electrochemical sensor was fabricated for determination of an anthracycline, doxorubicin(DOX) as a chemotherapy drug in plasma based on multi-walled carbon nanotubes modified platinum electrode(Pt/MWCnTs). DOX was effectively accumulated on the surface of modified electrode and generated a pair of redox peaks at around 0.522 and 0.647 V(vs. Ag/Ag Cl) in Britton Robinson(B-R) buffer(p H 4.0, 0.1 M). The electrochemical parameters including p H, type of buffer, accumulation time, amount of modifier and scan rate were optimized. Under the optimized conditions, there was a linear correlation between cathodic peak current and concentration of DOX in the range of 0.05–4.0 μg/m L with the detection limit of 0.002 μg/m L. The number of electron transfers(n) and electron transfer-coefficient(α) were estimated as 2.0 and 0.25, respectively. The constructed sensor displayed excellent precision, sensitivity, repeatability and selectivity in the determination of DOX in plasma. Moreover, cyclic voltammetry studies of DOX in the presence of DnA showed an intercalation mechanism with binding constant(K_b) of 1.12×10~5L/mol.

关键词： Doxorubicin MWCnTs Electrochemical sensor Human plasma Doxorubicin-DnA interaction

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

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：