检索结果-南通市图书馆

Chirality enables thermal magnon transistors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 161-166页

作者： Tao Yu Chengyuan Cai Gerrit e.W.Bauer School of Physics Huazhong University of Science and TechnologyWuhan 430074China .WPI-AIMR and Institute for Materials Research and SCIS Tohoku UniversitySendai 980-8577Japan Kavli Institute for Theoretical Sciences University of Chinese Academy of SciencesBeijing 100190China

We report a theory of thermal spin pumping into proximity magnets under a transverse-bias-driven heat flow of magnons in magnetic films when the dipolar coupling to the magnetic gate is tuned to be “chiral”. While there is no rectification of the magnon current in the film, we predict that chirality diverts a large percentage(50% for perfect chirality) of it into the gate. This transverse thermal spin pumping effect can be controlled by rotating the film magnetization and may help manage the heat flow in future magnonic circuits.

关键词： magnon chirality quantum transport transistor

Malargüe Site Remediation:A Successful Solution for Uranium Mill Tailings

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

原子能科学技术 2024年第10期58卷 2088-2094页

作者： BARARI e DíAZ J G GIOMIA KeMPf R A National Atomic energy Commission Av.Del Libertador 8250Ciudad Autónoma de Buenos AiresC1429BNPArgentina

Comisión Nacional de energía Atómica (CNeA) has the responsibility for restoring uranium mining facilities once the operations have ***,within its environmental Program and in compliance with its legal responsibilities,decides to implement a restoration project for all sites related to the mining and processing of uranium *** Malargüe Site is located within the Province of Mendoza in the city of Malargü*** is the first site to successfully complete its *** activities consist of relocation of tailings to an engineering *** tailings management(encapsulation) and rehabilitation of the area was finished in June *** remediation alternative for the ore tailings was selected after conducting comparative studies and submitted the project to the society for *** objective of the encapsulation of the mineral tails is to isolate them from the environment,also proceeding with the decontamination and rehabilitation of the area (landscaping,post-closure monitoring and 20 years monitoring period).encapsulation consisted of the construction of a containment cell for the mine tailings,to isolate them and prevent pollutants from entering the environment through the transfer *** clean the impacted areas,the soil was removed,it was incorporated into the encapsulation,and the filling was carried out with natural soils from the *** prevents radon transfer to the environment,as ^(222)Ra is an alpha emitter with a half-life of four days,which produces its own radioactive *** progeny are solids,and when a ^(222)Ra nucleus emits an alpha particle into the air,the resulting ^(218)Po nucleus,momentarily electrically charged,adheres to any dust *** prevents the discharge into the air containing radon and also containing dust particles charged with intensely radioactive radon *** tasks mentioned make it possible to decrease radon emanation,reduce radiological risks to the public and pre

关键词： remediation radionuclide transfer tailings encapsulation solution sustainable

The Ca^(2+)-sensing receptor and the pocketome:comparing nature's complexity with human intervention in receptor modulation

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

Signal Transduction and Targeted Therapy 2024年第8期9卷 3153-3154页

作者： edda S.f.Matthees Carsten Hoffmann Institut fur Molekulare Zellbiologie CMB-Center for Molecular BiomedicineUniversitatsklinikum JenaHans-Knoll StraBe 2D-07745 JenaGermany friedrich-Schiller-Universitat Jena Hans-KnollStraBe2D-07745 JenaGermany

In a recent paper published in Nature,the relatively understudied Ca^(2+)-sensing,receptor(CasR)within the Gprotein-coupled receptor(GPCR)family C,gained attention due to pioneering research led by Georgios Skiniotis ... 详细信息

关键词： Stanford gained Skin

Human dental pulp stem/stromal cells in clinical practice

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Stem Cells 2024年第2期16卷 54-57页

作者： Mohammed e Grawish Department of Oral Biology Faculty of DentistryMansoura UniversityMansoura 35561Egypt Department of Oral Biology Faculty of Oral and Dental MedicineDelta University for Science and TechnologyMansoura 11152Egypt

Dental pulp stem/stromal cells(DPSCs)are fibroblast-like,neural crest-derived,and multipotent cells that can differentiate into several *** are relatively easy to isolate from healthy and inflamed pulps,with little ethical concerns and can be successfully cryopreserved and *** therapeutic effects of DPSCs derived from animal or human sources have been extensively studied through in-vitro and in-vivo animal experiments and the findings indicated that DPSCs are effective not only for dental diseases but also for systemic *** that translational research is a critical step through which the fundamental scientific discoveries could be translated into applicable diagnostics and therapeutics that directly benefit humans,several clinical studies were carried out to generate evidence for the efficacy and safety of autogenous or allogeneic human DPSCs(hDPSCs)as a treatment modality for use in cell-based therapy,regenerative medicine/dentistry and tissue *** clinical medicine,hDPSCs were effective for treating acute ischemic stroke and human exfoliated deciduous teeth-conditioned medium(SHeD-CM)repaired vascular damage of the corpus cavernous,which is the main cause of erectile *** in clinical dentistry,autologous SHeD was able to rege-nerate necrotic dental pulp after implantation into injured teeth,and micrografts enriched with autologous hDPSCs and collagen sponge were considered a treatment option for human intrabony *** contrast,hDPSCs did not add a significant regenerative effect when they were used for the treatment of post-extraction ***-scale clinical studies across diverse populations are still lacking to provide robust evidence on the safety and efficacy of hDPSCs as a new treatment option for various human diseases including dental-related problems.

关键词： Dental pulp stem/stromal cells Human clinical studies Regenerative medicine Regenerative dentistry Cell-based therapy

Novel framework for an Intrusion Detection System Using Multiple feature Selection Methods Based on Deep Learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2024年第4期29卷 948-958页

作者： A.e.M.eljialy Mohammed Yousuf Uddin Sultan Ahmad Department of Information Systems College of Computer Engineering and SciencesPrince Sattam Bin Abdulaziz UniversityAlkharjSaudi Arabia Department of Computer Science College of Computer Engineering and SciencesPrince Sattam Bin Abdulaziz UniversityAlkharjSaudi Arabiaand also with University Center for Research and Development(UCRD)Department of Computer Science and EngineeringChandigarh UniversityPunjabIndia

Intrusion detection systems (IDSs) are deployed to detect anomalies in real time. They classify a network’s incoming traffic as benign or anomalous (attack). An efficient and robust IDS in software-defined networks is an inevitable component of network security. The main challenges of such an IDS are achieving zero or extremely low false positive rates and high detection rates. Internet of Things (IoT) networks run by using devices with minimal resources. This situation makes deploying traditional IDSs in IoT networks unfeasible. Machine learning (ML) techniques are extensively applied to build robust IDSs. Many researchers have utilized different ML methods and techniques to address the above challenges. The development of an efficient IDS starts with a good feature selection process to avoid overfitting the ML model. This work proposes a multiple feature selection process followed by classification. In this study, the Software-defined networking (SDN) dataset is used to train and test the proposed model. This model applies multiple feature selection techniques to select high-scoring features from a set of features. Highly relevant features for anomaly detection are selected on the basis of their scores to generate the candidate dataset. Multiple classification algorithms are applied to the candidate dataset to build models. The proposed model exhibits considerable improvement in the detection of attacks with high accuracy and low false positive rates, even with a few features selected.

关键词： random forest feature selection decision tree software-defined network logistic regression intrusion detection system XGB classifier AdaBoost

Green Hydrogen: Perspectives and Challenges in Using the Natural Gas Network in Ceará/Brazil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geoscience and environment Protection 2024年第3期12卷 70-94页

作者： francisco Alfredo de Castro Mona Lisa Moura de Oliveira Lutero Carmo de lima Daniel Silveira Serra Science and Technology Center State University of Ceará Ceará Brazil Av. Dr. Silas Munguba 1700 Fortaleza-Ceará Brazil

Climate change, mainly caused by the use of non-renewable fuels, has raised global concerns and led to the search for less polluting energy sources, making hydrogen a promising energy alternative with the potential to contribute to changes in the energy mix of various countries through the use of technologies that enable its production and use with low or zero carbon emissions. In this context, Brazil has aroused great interest from other countries in exploring its renewable resources for the production of hydrogen (green hydrogen). In this sense, the use of natural gas pipelines and the use of hydrogen in mixtures with natural gas have become the subject of studies due to their economically viable alternative for the immediate use of this energy vector. However, there are still technical and regulatory challenges regarding the integration of hydrogen into the existing natural gas pipeline network. In this context, the present study aims to address the effects of hydrogen interaction with the structure of natural gas pipeline steel and the regulatory barriers to the use of this network for the transportation of green hydrogen, particularly in the state of Ceará/Brazil. After extensive analysis of literature and regulatory documents, it was concluded that: 1) Ceará/Brazil has strong potential to meet the demand for green hydrogen through the use of solar and wind energy sources;2) there is feasibility for the adaptation or conversion of natural gas infrastructure for the transportation of green hydrogen;3) discussions regarding the regulatory competence of green hydrogen transportation and distribution through the natural gas network in Brazil are still incipient;4) the current regulation of the natural gas industry can serve as a subsidy for the regulation of green hydrogen and natural gas transportation.

关键词： Decarbonization Natural Gas Green Hydrogen Pipelines

evaluation of sodium borocaptate(BSH)and boronophenylalanine(BPA)as boron delivery agents for neutron capture therapy(NCT)of cancer:an update and a guide for the future clinical evaluation of new boron delivery agents for NCT

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cancer Communications 2024年第8期44卷 893-909页

作者： Rolf f.Barth Nilendu Gupta Shinji Kawabata Department of Pathology The Ohio State UniversityColumbusOhioUSA Department of Radiation Oncology The Ohio State UniversityColumbusOhioUSA Department of Neurosurgery Osaka Medical and Pharmaceutical UniversityTakatsukiOsakaJapan

Boron neutron capture therapy(BNCT)is a cancer treatment modality based on the nuclear capture and fission reactions that occur when boron-10,a stable isotope,is irradiated with neutrons of the appropriate energy to produce boron-11 in an unstable form,which undergoes instantaneous nuclear fission to produce high-energy,tumoricidal alpha *** primary purpose of this review is to provide an update on the first drug used clinically,sodium borocaptate(BSH),by the Japanese neurosurgeon Hiroshi Hatanaka to treat patients with brain tumors and the second drug,boronophenylalanine(BPA),which first was used clinically by the Japanese dermatologist Yutaka Mishima to treat patients with cutaneous ***,BPA has become the primary drug used as a boron delivery agent to treat patients with several types of cancers,specifically brain tumors and recurrent tumors of the head and neck *** focus of this review will be on the initial studies that were carried out to define the pharmacokinetics and pharmacodynamics of BSH and BPA and their biodistribution in tumor and normal tissues following administration to patients with high-grade gliomas and their subsequent clinical use to treat patients with highgrade ***,wewill summarize the studies thatwere carried out in Japan with BSH and subsequently at our own institution,The Ohio State University,and those of several other ***,we will describe studies carried out in Japan with BPA and then in the United States that have led to its use as the primary drug that is being used clinically for ***,although there have been intense efforts to develop new and better boron delivery agents for BNCT,none of these have yet been evaluated *** present reportwill provide a guide to the future clinical evaluation of new boron delivery agents prior to their clinical use for BNCT.

关键词： Boron neutron capture therapy(BNCT) boronophenylalanine(BPA) brain tumors head and neck cancer sodium borocaptate(BSH)

A C-shaped hinge for displacement magnification in MeMS rotational structures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2024年第1期10卷 55-66页

作者： Naga Manikanta Kommanaboina Teferi Sitotaw Yallew Alvise Bagolini Maria f.Pantano Department of Civil Environmental and Mechanical EngineeringUniversity of Trentovia Mesiano 7738123 TrentoItaly fondazione Bruno Kessler(fBK) Microsystems Technology(MST)via S.Croce 7738122 TrentoItaly

The design,analysis,fabrication,and characterization of two distinct MeMS rotational structures are provided;these structures include a classical symmetrical lancet structure and a novel symmetrical C-shaped structure provided with a tilted arm,and both are actuated by thermal *** proposed C-shaped structure implemented a curved beam mechanism to enhance the movement delivered by the thermal *** geometrical parameters of our proposed device were optimized using the design of experiment(DOe)***,the analytical modeling based on Castigliano’s second theorem and the simulations based on the finite element method(feM)were used to predict the behavior of the symmetrical C-shaped structure;the results were in good agreement with each *** MeMS-based rotational structures were fabricated on silicon-on-insulator(SOI)wafers using bulk micromachining technology and deep reactive ion etching(DRIe)*** fabricated devices underwent experimental characterization;our results showed that our proposed MeMS rotational structure exhibited a 28%improvement in the delivered displacement compared to the symmetrical lancet ***,the experimental results showed good agreement with those obtained from numerical *** proposed structures have potential applications in a variety of MeMS devices,including accelerometers,gyroscopes,and resonators,due to their ability to maximize displacement and thus enhance sensitivity.

关键词： shaped displacement structures

evaluation of the seismic behavior of reinforced concrete structures with flat slab-column gravity frame and shear walls through nonlinear analysis methods

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

earthquake engineering and engineering Vibration 2024年第3期23卷 713-726页

作者： M.A.Najafgholipour S.Heidarian Radbakhsh e.erfani Department of Civil and environmental engineering Shiraz University of TechnologyShiraz ***Iran Department of Building Civiland Environmental EngineeringConcordia UniversityMontréal H3G 1M8Canada

This paper presents an investigation of the seismic behavior of reinforced concrete(RC)structures in which shear walls are the main lateral load-resisting elements and the participation of flat slab floor systems is not considered in the seismic design *** this regard,the behavior of six prototype structures(with different heights and plan layouts)is investigated through nonlinear static and time history analyses,implemented in the OpenSees *** results of the analyses are presented in terms of the behavior of the slab-column connections and their mode of failure at different loading ***,the global response of the buildings is discussed in terms of some parameters,such as lateral overstrength due to the gravity flat slab-column *** to the nonlinear static analyses,in structures in which the slab-column connections were designed only for gravity loads,the slab-column connections exhibited a punching mode of failure even in the early stages of ***,the punching failure was eliminated in structures in which a minimum transverse reinforcement recommended in ACI 318(2019)was provided in the slabs at joint ***,despite neglecting the contribution of gravity flat slab-column frames in the lateral load resistance of the structures,a relatively significant overstrength was imposed on the structures by the gravity frames.

关键词： RC flat slab-column frames seismic behavior nonlinear analysis time history analysis