检索结果-南通市图书馆

Melting of hydrous pyroxenites with alkali amphiboles in the continental mantle:*** element compositions of melts and minerals

引用

Geoscience Frontiers 2024年第1期15卷 50-68页

作者： stephen F.Foley isra s.ezad school of Natural sciences Macquarie UniversityNorth RydeNew South Wales 2109Australia Research school of Earth sciences Australian National UniversityCanberraACT 2601Australia

The trace element compositions of melts and minerals from high-pressure experiments on hydrous pyroxenites containing K-richterite are presented. The experiments used mixtures of a third each of the natural minerals clinopyroxene, phlogopite and K-richterite, some with the addition of 5% of an accessory phase ilmenite, rutile or apatite. Although the major element compositions of melts resemble natural lamproites, the trace element contents of most trace elements from the three-mineral mixture are much lower than in lamproites. Apatite is required in the source to provide high abundances of the rare earth elements, and either rutile and/or ilmenite is required to provide the high field strength elements Ti, Nb, Ta, Zr and Hf. Phlogopite controls the high levels of Rb, Cs and *** abundances of trace elements in the various starting mixtures vary strongly because of the use of natural minerals, we calculated mineral/melt partition coefficients (DMin/melt) using mineral modes and melting reactions and present trace element patterns for different degrees of partial melting of hydrous pyroxenites. Rb, Cs and Ba are compatible in phlogopite and the partition coefficient ratio phlogopite/K-richterite is high for Ba (136) and Rb (12). All melts have low contents of most of the first row transition elements, particularly Ni and Cu ((0.1-0.01)×primitive mantle). Nickel has high DMin/melt for all the major minerals (12 for K-richterite, 9.2 for phlogopite and 5.6 for Cpx) and so behaves at least as compatibly as in melting of peridotites. Fluorine/chlorine ratios in melts are high and DMin/melt for fluorine decreases in the order apatite (2.2) > phlogopite (1.5) > K-richterite (0.87). The requirement for apatite and at least one Ti-oxide in the source of natural lamproites holds for mica pyroxenites that lack K-richterite. The results are used to model isotopic ageing in hydrous pyroxenite source rocks: phlogopite controls sr isotopes, so that lamproites with relatively l

关键词： Hydrous pyroxenite Lamproite Trace elements Phlogopite K-richterite Apatite

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

Melting of hydrous pyroxenites with alkali amphiboles in the continental mantle:*** relations and major element compositions of melts

引用

Geoscience Frontiers 2022年第4期13卷 48-74页

作者： stephen F.Foley isra s.ezad sieger R.van der Laan Maik Pertermann school of Natural sciences Macquarie UniversityNorth RydeNew South Wales 2109Australia Research school of Earth sciences Australian National UniversityCanberraACT 2601Australia Tata steel Europe Research and DevelopmentIjmuidenThe Netherlands Coos Bay OregonUSA

Melting experiments on ultramafic rocks rich in the hydrous minerals phlogopite or phlogopite+K-rich terite,some including 5%of accessory phases,have been conducted at 15 and 50 *** assemblages represent probable source components that contribute to melts in cratonic regions,but whose melt compositions are poorly known.A main series of starting compositions based on MARID xenoliths consisted of a third each of clinopyroxene(CPX),phlogopite(PHL)and K-richterite(KR)with or without 5%ilmenite,rutile or *** experiments were run without KR and with higher proportions of accessory *** traps were used at near-solidus temperatures to facilitate accurate analysis of wellquenched melts,for which reversal experiments demonstrate *** show that KR melts rapidly and completely within 50°C of the solidus,so that melts reflect the composition of the amphibole and its melting *** have high siO_(2) and especially K_(2)O but low CaO and Al_(2)O_(3) relative to basaltic melts produced from peridotites at similar *** have no counterparts amongst natural rocks,but most closely resemble leucite lamproites at 15 *** and PHL melt incongruently to form olivine(OL)and CPX at 15 kbar,promoting siO2 contents of the melt,whereas orthopyroxene OPX is increasingly stable at lower lithosphere pressures,leading to an increase in Mg O and decrease in siO_(2) in melts,which resemble olivine *** of mica pyroxenites without KR are richer in CaO and Al_(2)O_(3) and do not resemble *** experiments show that low CaO and Al_(2)O_(3) in igneous rocks is not necessarily a sign of a depleted peridotite *** phases produce melts exceptionally rich in P_(2)O_(5) or TiO_(2) depending on the phases present and are unlike any melts seen at the Earth’s surface,but may be important agents of metasomatism seen in *** addition of the 5%accessory phases ilmenite,rutile or apatite result in melting temper

关键词： Hydrous pyroxenite Experimental petrology Mantle melts Phlogopite Lamproite Mantle metasomatism

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

WebFLex:A Framework for Web Browsers-Based Peer-to-Peer Federated Learning systems Using WebRTC

引用

Computers, Materials & Continua 2024年第3期78卷 4177-4204页

作者： Mai Alzamel Hamza Ali Rizvi Najwa Altwaijry isra Al-Turaiki Department of Computer science College of Computer and Information SciencesKing Saud UniversityRiyadhKingdom of Saudi Arabia Department of Computer science and Engineering Punjab Engineering CollegeChandigarhIndia

scalability and information personal privacy are vital for training and deploying large-scale deep learning *** learning trains models on exclusive information by aggregating weights from various devices and taking advantage of the device-agnostic environment of web ***,relying on a main central server for internet browser-based federated systems can prohibit scalability and interfere with the training process as a result of growing client ***,information relating to the training dataset can possibly be extracted from the distributed weights,potentially reducing the privacy of the local data used for *** this research paper,we aim to investigate the challenges of scalability and data privacy to increase the efficiency of distributed training *** a result,we propose a web-federated learning exchange(WebFLex)framework,which intends to improve the decentralization of the federated learning *** is additionally developed to secure distributed and scalable federated learning systems that operate in web browsers across heterogeneous ***,WebFLex utilizes peer-to-peer interactions and secure weight exchanges utilizing browser-to-browser web real-time communication(WebRTC),efficiently preventing the need for a main central *** has actually been measured in various setups using the MNIsT *** results show WebFLex’s ability to improve the scalability of federated learning systems,allowing a smooth increase in the number of participating devices without central data *** addition,WebFLex can maintain a durable federated learning procedure even when faced with device disconnections and network ***,it improves data privacy by utilizing artificial noise,which accomplishes an appropriate balance between accuracy and privacy preservation.

关键词： Federated learning web browser privacy deep learning

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

Adaptive Power Control Aware Depth Routing in Underwater sensor Networks

引用

Computers, Materials & Continua 2021年第10期69卷 1301-1322页

作者： Ghufran Ahmed saiful Islam Ihsan Ali isra Adil Hayder Abdelmuttlib Ibrahim Abdalla Ahmed Muhammad Talha sultan s.Alshamrani Ag Asri Ag Ibrahim Department of Computer science FAST National University of Computer and Emerging Sciences(NUCES)KarachiPakistan Dr.A.Q.Khan Institute of Computer sciences and Information Technology KahutaPakistan Faculty of Computer science and Information Technology University of MalayaKuala Lumpur50603Malaysia Department of Computer science COMSATS University IslamabadIslamabadPakistan Deanship of scientific Research King Saud UniversityRiyadhSaudi Arabia Department of Information Technology College of Computer and Information TechnologyTaif UniversityTaif21944Saudi Arabia Faculty of Computing and Informatics Universiti Malaysia SabahKota KinabaluSabahMalaysia

Underwater acoustic sensor network(UAsN)refers to a procedure that promotes a broad spectrum of aquatic *** can be practically applied in seismic checking,ocean mine identification,resource exploration,pollution checking,and disaster *** confronts many difficulties and issues,such as low bandwidth,node movements,propagation delay,3D arrangement,energy limitation,and high-cost production and arrangement costs caused by antagonistic underwater *** wireless sensor networks(UWsNs)are considered a major issue being encountered in energy management because of the limited battery power of their ***,the harsh underwater environment requires vendors to design and deploy energy-hungry devices to fulfil the communication requirements and maintain an acceptable quality of ***,increased transmission power levels result in higher channel interference,thereby increasing packet *** the facts mentioned above,this research presents a controlled transmission power-based sparsity-aware energy-efficient clustering in *** contributions of this technique is ***,it uses the adaptive power control mechanism to utilize the sensor nodes’battery and reduce channel interference ***,thresholds are defined to ensure successful ***,clustering can be implemented in dense areas to decrease the repetitive transmission that ultimately affects the energy consumption of nodes and interference ***,mobile sinks are deployed to gather information locally to achieve the previously mentioned *** suggested protocol is meticulously examined through extensive simulations and is validated through comparison with other advanced UWsN *** show that the suggested protocol outperforms other procedures in terms of network lifetime and packet delivery ratio.

关键词： UWsNs UAsNs Qos

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

Alpha Fusion Adversarial Attack Analysis Using Deep Learning

引用

Computer systems science & Engineering 2023年第7期46卷 461-473页

作者： Mohibullah Khan Ata Ullah isra Naz sajjad Haider Nz Jhanji Mohammad shorfuzzaman Mehedi Masud Department of Computer science National University of Modern LanguagesIslamabadPakistan Department of Computer science COMSATS University IslamabadIslamabadPakistan school of Computer science(sCs) Taylor’s UniversitySelangorMalaysia Department of Computer science College of Computers and Information TechnologyTaif UniversityP.O.Box 11099Taif21944Saudi Arabia

The deep learning model encompasses a powerful learning ability that integrates the feature extraction,and classification method to improve *** Neural Networks(CNN)perform well in machine learning and image processing tasks like segmentation,classification,detection,identification,*** CNN models are still sensitive to noise and *** smallest change in training images as in an adversarial attack can greatly decrease the accuracy of the CNN *** paper presents an alpha fusion attack analysis and generates defense against adversarial *** proposed work is divided into three phases:firstly,an MLsTM-based CNN classification model is developed for classifying COVID-CT ***,an alpha fusion attack is generated to fool the classification *** alpha fusion attack is tested in the last phase on a modified LsTM-based CNN(CNN-MLsTM)model and other pre-trained *** results of CNN models show that the accuracy of these models dropped greatly after the alpha-fusion *** highest F1 score before the attack was achieved is 97.45 And after the attack lowest F1 score recorded is 22%.Results elucidate the performance in terms of accuracy,precision,F1 score and Recall.

关键词： Adversarial attack classification deep learning preturbation images

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

Influence of erbium on structural,and charged particles,photons,and neutrons shielding properties of Ba_(1-x)Er_(x)snO_(3) perovskite ceramics

引用

Journal of Rare Earths 2024年第4期42卷 724-732页

作者： M.K.h.Hamad Nidal Dwaikat M.H.A.Mhareb M.I.sayyed R.M.Hamad Y.s.M.Alajerami M.A.Almessiere Gameel saleh Ahmad Hussein Alomari K.A.Ziq Department of Basic sciences School of Social and Basics SciencesAl Hussein Technical UniversityKing Abdullah II St 242Amman11831Jordan Department of Physics College of Engineering and PhysicsInterdisciplinary Research Center for Advanced MaterialsKing Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Department of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Basic and Applied scientific Research Center Imam Abdulrahman Bin Faisal UniversityP0.Box 1982Dammam31441Saudi Arabia Department of Physics Faculty of ScienceIsra UniversityAmman11622Jordan Department of Nuclear Medicine Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Arabia Medical Imaging Department Applied Medical Sciences FacultyAl Azhar University-Gaza CityPo.Box 1277Palestine Department of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box1982Dammam 31441Saudi Arabia Department of Biomedical Engineering College of EngineeringImam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Energy&Minerals Regulatory Commission Amman11821Jordan

Five perovskite ceramics samples of Ba_(1-x)Er_(x)snO_(3) with x=0.00,0.05,0.10,0.15,and 0.20 were synthesized using the conventional solid-state reaction *** prepared samples were characterized by X-ray diffraction(XRD),Fourier transforms infrared(FTIR),and UV-Vis *** shielding properties against ionizing radiation were also *** XRD analysis shows the perovskite cubic structure as the major phase in all *** FTIR reveals a distinctive band around 614-620 cm^(-1) ascribed to the antisymmetric O-sn-O ***-Vis spectroscopy was used to determine the bandgap according to diffuse reflectance,and the results display a fixed enhancement in the bandgap from 3.2 to 3.3 eV for all ***-ray shielding properties of the synthesized samples were experimentally measured and compared with XCOM computational *** relative differences(Δ,%)between experimental and theo retical values are low and fall within the 0.446%-7.10%*** addition of Er leads to the enhanced density,neutron,and gamma shielding *** contrast,charged particles’shielding parameters gradually reduce with rising Er *** results suggest that Ba_(1-x)Er_(x)snO_(3) samples can be used in different radiation shielding applications.

关键词： Perovskite Ceramics Gamma ray shielding Mass stopping power 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

Penetrating and Basilic Trauma of the Thorax in a Context of Difficult Diagnosis at the Pediatric Hospital of Bangui (Central African Republic)

引用

Open Journal of Pediatrics 2023年第5期13卷 657-662页

作者： Daniel sylvère Ouaïmon Jacob israël Junior sopio Nathan Gbanade Packo Oumarou Youssof Center Hospitalier Universitaire Pediatrique de Bangui (CHUPB) Bangui Central African Republic Faculty of Health sciences Bangui University Bangui Central African Republic

Appropriate management of penetrating trauma to the thorax requires knowledge of vulnating agents, as well as the principles of ballistic injury. The importance of the approach’s choice for surgical exploration of these injuries, and parietal damage, is an essential factor in decision making in the management and definition of the therapeutic strategy for these injuries. The authors report a clinical case of a penetrating traumatic ballistic wound of the thorax managed in a context of difficult diagnosis in the surgical Unit of the CHUPB.

关键词： Firearm Wound Thorax Trauma Child CAR

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

Impact of Technology and Innovation on Adaptation of Architectonic Tradition for a sustainable Future in the Middle East

引用

Journal of Civil Engineering and Architecture 2019年第4期13卷 273-281页

作者： isra’a s. Fardous Amar Bennadji scott sutherland school of Architecture and Built Environment Robert Gordon University

Over the last three decades,the Middle East(ME)region has experienced rapid economic and infrastructure *** of the dwelling places have fully adopted western architectural trends ignoring both the cultural and environmental fundamentals of the *** paper is incorporated with a ***,it is cognizant of the fact that socio-demographics has changed over the *** cities in the region have experienced massive population growth which has made traditional architectural(TA)less *** study is focused on identifying how recent innovation and technologies can be used in the adaptation of architectonic *** to identify how the inherent sustainability characteristics of TA can be integrated with modern architectural studies for cultural relevant and sustainable dwellings in the *** investigation in houses in Riyadh City,saudi Arabia where the climate is mostly hot and arid will serve as the case study for this research because of its strong history in TA coupled with proliferation of western *** will utilize a qualitative data because it is inclusive of situational descriptions,events and observed *** will enable findings based from the participants view to cultural existence and change,and meanings important to ***,researcher will rely on the themes as the main backbone on what the study is trying to bring ***,will ensure findings end up with what is appreciated for environmental housing application not only based on climate control but also based on other psychological and visual components.

关键词： Environmental traditional architecture thermal comfort transitional architecture and well-being

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

Using HF rather than NH_4F as doping source for spray-deposited snO_2:F thin films

引用

Journal of Central south University 2012年第3期19卷 791-796页

作者： s.J.Ikhmayies R.N.Ahmad-Bitar Department of Basic sciences-Physics Faculty of Information TechnologyAl Isra University Physics Department Faculty of ScienceUniversity of Jordan

Fluorine doped tin oxide snO2：F thin films were prepared by the spray pyrolysis （sP） technique on glass substrates by using snC12.2H2O as a precursor and NH4F and HF as doping compounds. A comparison between the properties of the films obtained by using the two doping compounds was performed by using I-V characteristics in the dark at room temperature, AC measurements, and transmittance. It is found that the films prepared by using HF have smaller resistivity, lower impedance and they are less capacitive than films prepared by using NH4F. In addition, these films have higher transmittance, higher optical bandgap energy and narrower Urbach tail width. These results are interesting for the use of snO2：F as forecontact in Cds/CdTe solar cells.

关键词： Cds/CdTe solar cells transparent conducting oxides spray pyrolysis doping

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

AC measurements of spray-deposited Cds:In thin films

引用

Journal of Central south University 2012年第3期19卷 829-834页

作者： s.J.Ikhmayies R.N.Ahmad-Bitar Department of Basic sciences-Physics Faculty of Information TechnologyAl Isra University Physics Department Faculty of ScienceUniversity of Jordan

Indium doped cadmium sulfide thin films （Cds：In） were produced by the spray pyrolysis technique on glass substrates. AC measurements were used to investigate the electrical properties of the films depending on Brick-layer model for polycrystalline materials. The measurements were performed at room temperature in the dark and room light in the frequency range from 20 Hz to 1 MHz using coplanar indium electrodes. The data were analyzed by using Bode plots for the impedance Z and dielectric loss tang with frequencyf It is found that the impedance has no dependence on frequency in the low frequency region but has 1/f dependence in the high frequency region. One dielectric loss peak is obtained, which means the presence of a single relaxation time, and hence the films are modeled by just one RC circuit which represents the grains. This means that there is just one conduction mechanism that is responsible for the conduction in the bulk, due to electronic transport through the grains. Real values of the impedance in the low frequency region and relaxation times for treated and as-deposited fihns were estimated.

关键词： II-VI compounds spray pyrolysis impedance dielectric loss Bode plots

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：