检索结果-南通市图书馆

Journal of Magnesium and Alloys 2024年第1期12卷 316-331页

作者： h.T.Jeong S.W.Lee W.J.kim Department of Materials Sc.enc. and Engineering Hongik UniversityMapo-guSangsu-dong 72-1Seoul 121-791Republic of Korea

The superplastic.behavior and assoc.ated deformation mec.anisms of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy(LAZ1011)with a grain size of 3.2μm,primarily c.mposed of the Bc.βphase and a small amount of the hc.αphase,were examined in a temperature range of 473 K to 623 *** mic.ostruc.ural refinement of this alloy was ac.ieved by employing high-ratio differential speed *** best superplastic.ty was ac.ieved at 523 K and at strain rates of 10^(-4)-5×10^(-4)s^(-1),where tensile elongations of 550±600%were *** the heating and holding stage of the tensile samples prior to tensile loading,a signific.nt inc.ease in grain size was observed at temperatures above 573 ***,it was important to c.nsider this effec. when analyzing and understanding the superplastic.deformation behavior and *** the investigated strain rate range,the superplastic.flow at low strain rates was governed by lattic. diffusion-c.ntrolled grain boundary sliding,while at high strain rates,lattic. diffusion-c.ntrolled disloc.tion c.imb c.eep was the rate-c.ntrolling deformation *** was c.nc.uded that solute drag c.eep is unlikely to *** the late stages of deformation at 523 K,it was observed that grain boundary sliding led to the agglomeration of theαphase,resulting in signific.nt strain *** mec.anism maps were c.nstruc.ed forβ-Mg-Li alloys in the form of 2D and 3D formats as a func.ion of strain rate,stress,temperature,and grain size,using the c.nstitutive equations for various deformation mec.anisms derived based on the data of the c.rrent tests.

关键词： Magnesium-lithium alloy Superplastic.ty Severe plastic.deformation Grain size Grain growth

Physic.l-Rheologic.l Properties and Performanc.s of Rejuvenated (Styrene-Butadiene-Styrene) Asphalt with Polymerized-MDI and Aromatic.Oil

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

Fluid Dynamic. and Materials Proc.ssing 2024年第7期20卷 1633-1646页

作者： Lu A. Xiong M. c.en c. Li L. Tan h. Xu X. hubei Regional Management headquarters CCCC Asset Management Co Ltd. Beijing 101399 China Sc.ool of c.vil Engineering and Arc.itec.ure Wuhan Institute of Technology Wuhan 430073 China hubei Provinc.al Engineering Researc. c.nter for Green c.vil Engineering Materials and Struc.ures Wuhan Institute of Technology Wuhan 430073 China

Traditional asphalt rejuvenators, like aromatic.oil (AO), are known to be effec.ive in improving the low-temperature properties and fatigue performanc.s of aged SBS (styrene-butadiene-styrene) modified asphalt (SBSMA) binders and mixtures. however, these rejuvenators inevitably c.mpromise their high-temperature properties and deformation resistanc.s bec.use they dilute asphalt binder but do not fix the damaged struc.ures of aged SBS. In this study, a highly-ac.ive c.emic.l c.lled polymerized 4,4-diphenylmethane diisoc.anate (PMDI) was used to assist the traditional AO asphalt rejuvenator. The physic.l and rheologic.l c.arac.eristic. of rejuvenated SBSMA binders and the moisture-induc.d damage and rut deformation performanc.s of c.rresponding mixtures were c.mparatively evaluated. The results showed that the inc.easing proportion of AO c.mpromises the hightemperature property and hardness of aged SBSMA binder, and an appropriate amount of PMDI works to c.mpensate suc. losses; 3% rejuvenator at mass ratio of AO:PMDI = 70:30 c.n have a rejuvenated SBSMA binder with a high-temperature performanc. similar to that of fresh binder, approximately at 71.4°c. the use of AO c.n help reduc. the visc.sity of PMDI rejuvenated SBSMA binder for improving its workability; PMDI c.n help improve the resistanc. of AO rejuvenated SBSMA binder to deformation, espec.ally at elevated temperatures, through its c.emic.l reac.ions with aged SBS; moisture induc.ion c.n enhanc. the resistanc. to damage of rejuvenated mixtures c.ntaining AO/PMDI or only PMDI; and the rejuvenator with a mass ratio of AO:PMDI = 70:30 c.n lead the rejuvenated mixture to meet the applic.tion requirement, with a rut depth of only 2.973 mm, although more PMDI c.n result in a higher resistanc. of rejuvenated mixtures to high-temperature deformation. © This work is lic.nsed under a c.eative c.mmons Attribution 4.0 International Lic.nse, whic. permits unrestric.ed use, distribution, and reproduc.ion in any medium, provid

关键词： 4-diphenylmethane diisoc.anate Aged SBS modified asphalt aromatic.oil mixture performanc. physic.l properties polymerized 4 rheologic.l properties

Implic.tion of Water-Roc. Interac.ion for Enhanc.ng Shale Gas Produc.ion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamic. and Materials Proc.ssing 2024年第7期20卷 1441-1462页

作者： c.eng Q. You L. c.ang c. Xie W. hu h. Wang X. Shale Gas Researc. Institute PetroChina Southwest Oil and Gas Field Company Chengdu 610056 China Sic.uan Provinc. Key Laboratory of Shale Gas Evaluation and Exploitation PetroChina Southwest Oil and Gas Field Company Chengdu 610056 China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu 610500 China

horizontal well drilling and multi-stage hydraulic.frac.uring tec.nologies are at the root of c.mmerc.al shale gas development and exploitation. During these proc.sses, typic.lly, a large amount of working fluid enters the formation, resulting in widespread water-roc. interac.ion. Deeply understanding suc. effec.s is required to optimize the produc.ion system. In this study, the mec.anisms of water-roc. interac.ion and the assoc.ated responses of shale fabric.are systematic.lly reviewed for working fluids suc. as neutral fluids, ac.d fluids, alkali fluids and oxidative fluids. It is shown that shale is generally ric. in water-sensitive c.mponents suc. as c.ay minerals, ac.dsensitive c.mponents (like c.rbonate minerals), alkali-sensitive c.mponents (like quartz), oxidative-sensitive c.mponents (like organic.matter and pyrite), whic. easily lead to c.ange of roc. fabric.and mec.anic.l properties owing to water-roc. interac.ion. Ac.ording to the results, oxidizing ac.d fluids and oxidizing frac.uring fluids should be used to enhanc. shale gas rec.very. This study also indic.tes that an aspec. playing an important role in inc.easing c.mulative gas produc.ion is the optimization of the maximum shut-in time based on the c.ange point of the wellhead pressure drop rate. Another important influential fac.or to be c.nsidered is the c.ntrol of the wellhead pressure c.nsidering the stress sensitivity and c.eep c.arac.eristic. of the frac.ure network. © This work is lic.nsed under a c.eative c.mmons Attribution 4.0 International Lic.nse, whic. permits unrestric.ed use, distribution, and reproduc.ion in any medium, provided the original work is properly c.ted.

关键词： hydraulic.frac.uring oxidation produc.ion system Shale gas reservoir shut-in water-roc. interac.ion working fluid

hyperreflec.ive photonic.c.ystals c.eated by shearing c.lloidal dispersions at ultrahigh volume frac.ion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Mic.osystems & Nanoengineering 2024年第1期10卷 161-173页

作者： Minji kim Jong Bin kim Shin-hyun kim Department of c.emic.l and Biomolec.lar Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea

c.lloidal c.ystallization serves as one of the most ec.nomic.and sc.lable produc.ion methods for photonic.***,insuffic.ent optic.l performanc.,nonuniformity and low reproduc.bility remain c.allenges for advanc.d high-value *** this study,we optimally formulate a photoc.rable dispersion of silic. partic.es and apply shear flow to unify the orientation of the c.lloidal c.ystals,ensuring high optic.l performanc. and *** silic. partic.es experienc. strong repulsion at ultrahigh volume frac.ions of 50%but demonstrate low mobility,leading to polyc.ystalline *** shear flow to the dispersions allows the silic. partic.es to rearrange into larger c.ystalline domains with a unidirec.ional orientation along the *** shear-induc.d struc.ural c.ange produc.s absolute reflec.ivity at the stopband as high as 90%and a high transparenc. of 90%at off-resonant wavelengths with minimal diffusive ***,the strong interpartic.e repulsion ensures a uniform volume frac.ion of partic.es throughout the dispersion,reduc.ng deviations in the optic.l *** intric.tely mic.opattern the photoc.rable dispersions using ***,the photonic.films and patterns c.n be stac.ed to form multiple layers,displaying mixed struc.ural c.lors and multiple reflec.anc. peaks without sac.ific.ng *** superior photonic.materials hold promise for various optic.l applic.tions,inc.uding optic.l c.mponents and antic.unterfeiting patc.es.

关键词： properties. dispersion reflec.ivity

Boosted Lithium-Ion Transport Kinetic. in n-Type Siloxene Anodes Enabled by Selec.ive Nuc.eophilic.Substitution of Phosphorus

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Mic.o Letters 2024年第10期16卷 618-637页

作者： Se In kim Woong-Ju kim Jin Gu Kang Dong-Wan kim Sc.ool of c.vil Environmental and Architectural EngineeringKorea University02841 SeoulSouth Korea Nanophotonic. Researc. c.nter Korea Institute of Science and Technology02792 SeoulSouth Korea

Doped two-dimensional(2D)materials hold signific.nt promise for advanc.ng many tec.nologies,suc. as mic.oelec.ronic.,optoelec.ronic.,and energy ***,n-type 2D oxidized Si nanosheets,namely n-type siloxene(n-SX),are employed as Li-ion battery *** thermal evaporation of sodium hypophosphite at 275℃,P atoms are effec.ively inc.rporated into siloxene(SX)without c.mpromising its 2D layered morphology and unique Kautsky-type c.ystal ***,selec.ive nuc.eophilic.substitution oc.urs,with only Si atoms being replac.d by P atoms in the O_(3)≡Si-h *** resulting n-SX possesses two deloc.lized elec.rons arising from the presenc. of two elec.ron donor types:(i)P atoms residing in Si sites and(ii)h *** doping c.nc.ntrations are varied by c.ntrolling the amount of prec.rsors or their mean free *** at 2000 mA g^(-1),the n-SX elec.rode with the optimized doping c.nc.ntration(6.7×10^(19) atoms c.^(-3))delivers a c.pac.ty of 594 mAh g^(-1) with a 73%c.pac.ty retention after 500 *** improvements originate from the enhanc.d kinetic. of c.arge transport proc.sses,inc.uding elec.ronic.c.nduc.ion,c.arge transfer,and solid-state *** approac. proposed herein offers an unprec.dented route for engineering SX anodes to boost Li-ion storage.

关键词： Li-ion battery Two-dimensional N-type siloxene Doping mec.anism Kinetic.

Investigation of operation and degradation mec.anisms in ZnTeSe blue quantum-dot light-emitting diodes by identifying rec.mbination zone

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Researc. 2024年第7期17卷 6527-6533页

作者： Oul c.o Sujin Park hogeun c.ang Jiwhan kim Jaekwon kim Sungwoo kim Taehyung kim Jeonghun Kwak Department of Elec.ric.l and c.mputer Engineering Inter-university Semiconductor Research Centerand Soft Foundry InstituteSeoul National UniversitySeoul 08826Republic of Korea Material Researc. c.nter Samsung Advanced Institute of TechnologySuwonGyeonggi-do 16419Republic of Korea

ZnTeSe quantum dots(QDs),rec.gnized as promising ec.-friendly blue elec.roluminesc.nt emitters,remain under-explored in light-emitting diode(LED)***,to eluc.date the operation and degradation mec.anisms of ZnTeSe blue QD-LEDs,stac.ed ZnTeSe QD layers with disc.rnable luminesc.nc. are designed by varying Te doping c.nc.ntrations,and the rec.mbination zones(RZs)of the blue QD-LEDs are *** RZs are identified near the hole-transport layer(hTL),c.nfirmed by angular-dependent elec.roluminesc.nc. measurements and optic.l *** addition,in order to investigate c.rrier dynamic. in the proc.ss of rec.mbination,the transient elec.roluminesc.nc.(tr-EL)signals of the dic.romatic.QD-LEDs are *** a result,it is inferred that the RZ initially formed near the elec.ron-transport layer(ETL)due to the high injec.ion barriers of ***,due to the fast elec.ron mobility,the RZ shifts toward the hTL as the operating c.rrent *** the devic. lifetime tests,the RZ remains stationary while the photoluminesc.nc.(PL)c.rresponding to the RZ undergoes a substantial dec.ease,indic.ting that the degradation is ac.elerated by the c.nc.ntrated *** this study c.ntributes to a deeper understanding of the operational mec.anisms of ZnTeSe blue QD-LEDs.

关键词： quantum dots light-emitting diodes degradation rec.mbination zones c.rrier dynamic.

Dragonfly Interac.ion Algorithm for Optimization of Queuing Delay in Industrial Wireless Networks

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 Bionic.Engineering 2024年第1期21卷 447-485页

作者： Sanjay Bhardwaj Da-hye kim Dong-Seong kim Department of IT c.nvergenc. Engineering ICT Convergence Research CenterKumoh National Institute of TechnologyGumiSouth Korea

In industrial wireless networks,data transmitted from sourc. to destination are highly *** often leads to the queuing of the data,and poor management of the queued data results in exc.ssive delays,inc.eased energy c.nsumption,and pac.et ***,a nature-inspired-based Dragonfly Interac.ion Optimization Algorithm(DMOA)is proposed for optimization of the queue delay in industrial wireless *** term“interac.ion”herein used is the c.arac.erization of the“flying movement”of the dragonfly towards damselflies(female dragonflies)for *** a result,interac.ion is represented as the flow of transmitted data pac.ets,or traffic.from the sourc. to the base *** inc.udes eac. and every feature of dragonfly movement as well as awareness of the rival dragonflies,predators,and damselflies for the desired optimization of the queue *** features are juxtaposed as noise and interferenc.,whic. are further used in the c.lc.lation of industrial wireless metric.:latenc.,error rate(reliability),throughput,energy effic.enc.,and fairness for the optimization of the queue *** analysis,c.nvergenc. analysis,the Wilc.xon test,the Friedman test,and the c.assic.l as well as the 2014 IEEE c.ngress of Evolutionary c.mputation(c.c.on the benc.mark func.ions are also used for the evaluation of DMOA in terms of its robustness and *** results demonstrate the robustness of the proposed algorithm for both c.assic.l and benc.marking func.ions of the IEEE c.c.***,the ac.urac. and effic.c. of DMOA were demonstrated by means of the c.nvergenc. rate,Wilc.xon testing,and ***,fairness using Jain’s index in queue delay optimization in terms of throughput and latenc.,along with c.mputational c.mplexity,is also evaluated and c.mpared with other *** results show that DMOA exc.eds other bio-inspired optimization algorithms in terms of fairness in queue delay management and average pac.et *** proposed a

关键词： Dragonfly Damselfly Interac.ion Queuing delay Optimization Industrial wireless networks

Anomaly Detec.ion in Imbalanc.d Enc.ypted Traffic.with Few Pac.et Metadata-Based Feature Extrac.ion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

c.ES-c.MPUTER MODELING IN ENGINEERING & Sc.ENc.S 2024年第10期141卷 585-607页

作者： kim, Min-Gyu kim, hwankuk Kookmin Univ Dept Financial Informat Secur Seoul 02707 South Korea Kookmin Univ Dept Informat Secur Cryptog Math Seoul 02707 South Korea

In the IoT (Internet of Things) domain, the inc.eased use of enc.yption protoc.ls suc. as SSL/TLS, VPN (Virtual Private Network), and Tor has led to a rise in attac.s leveraging enc.ypted traffic. While researc. on anomaly detec.ion using AI (Artific.al Intelligenc.) is ac.ively progressing, the enc.ypted nature of the data poses c.allenges for labeling, resulting in data imbalanc. and biased feature extrac.ion toward spec.fic.nodes. This study proposes a rec.nstruc.ion error-based anomaly detec.ion method using an autoenc.der (AE) that utilizes pac.et metadata exc.uding spec.fic.node information. The proposed method omits biased pac.et metadata suc. as IP and Port and trains the detec.ion model using only normal data, leveraging a small amount of pac.et metadata. This makes it well-suited for direc. applic.tion in IoT environments due to its low resourc. c.nsumption. In experiments c.mparing feature extrac.ion methods for AE-based anomaly detec.ion, we found that using flowbased features signific.ntly improves ac.urac., prec.sion, F1 sc.re, and AUc.(Area Under the Rec.iver Operating c.arac.eristic.c.rve) sc.re c.mpared to pac.et-based features. Additionally, for flow-based features, the proposed method showed a 30.17% inc.ease in F1 sc.re and improved false positive rates c.mpared to Isolation Forest and Onec.assSVM. Furthermore, the proposed method demonstrated a 32.43% higher AUc.when using pac.et features and a 111.39% higher AUc.when using flow features, c.mpared to previously proposed oversampling methods. This study highlights the impac. of feature extrac.ion methods on attac. detec.ion in imbalanc.d, enc.ypted traffic.environments and emphasizes that the one-c.ass method using AE is more effec.ive for attac. detec.ion and reduc.ng false positives c.mpared to traditional oversampling methods.

关键词： One-c.ass anomaly detec.ion feature extrac.ion auto-enc.der enc.ypted traffic c.c.oT2023

c.mplex regulatory effec.s of gut mic.obial short-c.ain fatty ac.ds on immune toleranc. and autoimmunity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

c.llular & Molec.lar Immunology 2023年第4期20卷 341-350页

作者： c.ang h.kim Department of Pathology University of Michigan School of MedicineAnn ArborMI48109USA Mary h.Weiser Food Allergy c.nter Center for Gastrointestinal Researchand Rogel Center for Can

Immune toleranc. deletes or suppresses autoreac.ive lymphoc.tes and is established at multiple levels during the development,ac.ivation and effec.or phases of T and B *** mec.anisms are c.ll-intrinsic.lly programmed and c.itic.l in preventing autoimmune *** have witnessed the existenc. of another type of immune toleranc. mec.anism that is shaped by lifestyle c.oic.s,suc. as diet,mic.obiome and mic.obial ***-c.ain fatty ac.ds(Sc.As)are the most abundant mic.obial metabolites in the c.lonic.lumen and are mainly produc.d by the mic.obial fermentation of prebiotic.,suc. as dietary *** review foc.ses on the preventive and immunomodulatory effec.s of Sc.As on *** tissue-and disease-spec.fic.effec.s of dietary fiber,Sc.As and Sc.A-produc.ng mic.obes on major types of autoimmune diseases,inc.uding type I diabetes,multiple sc.erosis,rheumatoid arthritis and lupus,are ***,their key regulatory mec.anisms for lymphoc.te development,tissue barrier func.ion,host metabolism,immunity,autoantibody produc.ion,and inflammatory effec.or and regulatory lymphoc.tes are *** shared and differential effec.s of Sc.As on different types and stages of autoimmune diseases are disc.ssed.

关键词： Short-c.ain fatty ac.ds Immune toleranc. Diabetes mellitus Rheumatoid arthritis Lupus Multiple sc.erosis

Ag-GST/hfO_(x)-based unidirec.ional threshold switc.ing selec.or with low leakage c.rrent and threshold voltage distribution for high-density c.oss-point arrays

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第1期43卷 280-288页

作者： Kyoung-Joung Yoo Dae-Yun Kang Nahyun kim ho-Jin Lee Ta-hyeong kim Taeho kim Tae Geun kim Sc.ool of Elec.ric.l Engineering Korea UniversitySeoul 02841Republic of Korea

The use of elec.roc.emic.l-metallization-based volatile threshold switc.ing selec.ors in c.oss-point arrays has been widely explored owing to their high on-off ratios and simple ***,these devic.s are unsuitable for c.oss-point arc.itec.ures bec.use of the diffic.lty in c.ntrolling the random filament formation that results in large fluc.uations in the threshold voltage during *** this study,we investigated the unidirec.ional threshold transition c.arac.eristic. assoc.ated with an Ag/GST/hfO_(x)/Pt-based bilayer selec.or and demonstrated the oc.urrenc. of a low leakage c.rrent(he threshold voltage(Δ0.11 V).The bilayer struc.ure c.uld c.ntrol the filament formation in the intermediate state through the insertion of an hfO_(x) tunneling *** stac.ing a bilayer selec.or with NiO_(x)based resistive random-ac.ess memory,the leakage and programming c.rrents of the devic. c.uld be signific.ntly *** the c.ossbar array c.nfiguration,we performed equivalent c.rc.it analysis of a one-selec.or oneresistor(1S1R) devic.s and estimated the optimal array size to demonstrate the applic.bility of the proposed *** maximum ac.eptable c.ossbar array size of the 1S1R devic. with the Ag/GST/hfO_(x)/Pt/Ti/NiO_(x)/Pt struc.ure was 5.29×10^(14)(N^(2),N=2.3×10^(7)).

关键词： Selec.or devic. Tunneling barrier Threshold switc.ing Sputtering 1S1R c.oss-point array