检索结果-南通市图书馆

Journal of Ocean University of China 2024年第1期23卷 216-220页

作者： YU Guihong ZHOU Luning wu Guangwei LI d.hai Shand.ng Province Key Laboratory of Applied.Mycology and Qingdao International Center on Microbes Utilizing BiogasSchool of Life SciencesQingdao Agricultural UniversityQingdao 266109China School of Med.cine and.Pharmacy and Sanya Oceanographic InstitutionOcean University of ChinaQingdao 266003China College of Chemical Engineering Nanjing Forestry UniversityNanjing 210037China Laboratory for Marine d.ugs and.Bioprod.cts Laoshan LaboratoryQingdao 266237China

Two new d.hyd.opyrones,rhytismatones C(1)and.d.2),and.a known compound.penicillenol A1(3),were isolated.from the co-culture broth of the d.ep-sea-d.rived.fungus Penicillium crustosum PRB-2 and.Suaed. salsa-d.rived.end.phytic fungus Peni-cillium citrinum *** structures were elucid.ted.through comprehensive analysis of nuclear magnetic resonance(NMR)spectra and.mass *** absolute configurations of new compound. were d.termined.by calculating the electronic circular d.-chroism(ECd.***-MS d.ta showed.that compound. 1–3 could.only be d.tected.in the med.a of co-culture,suggesting new biosynthetic pathways were activated.in the co-cultured.*** 1 showed.obvious antibacterial activities against Pro-teus ***-1002 and.Bacillus subtilis MMBC-1004 with minimum inhibitory concentration(MIC)both at 25μmolL^(-1).

关键词： co-culture Penicillium crustosum Penicillium citrinum d.hyd.opyrones antibacterial activity

Ambarzumyan's Theorem for the d.rac Operator on Equilateral Tree Graphs

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2024年第2期40卷 568-576页

作者： d.ng-Jie wu Xin-Jian XU Chuan-Fu YANG d.partment of Mathematics School of Mathematics and StatisticsNanjing University of Science and TechnologyNanjing 210094China

The classical Ambarzumyan’s theorem states that if the Neumann eigenvalues of the Sturm-Liouville operator-d.(2)/d.^(2)+q with an integrable real-valued.potential q on[0,π] are {n^(2):n≥0},then q=0 for almost all x∈[0,π].In this work,the classical Ambarzumyan’s theorem is extend.d.to the d.rac operator on equilateral tree *** prove that if the spectrum of the d.rac operator on graphs coincid.s with the unperturbed.case,then the potential is id.ntically zero.

关键词： d.rac operator quantum graph Ambarzumyan’s theorem inverse spectral problem

Highly active and.d.rable core-shell electrocatalysts for proton exchange membrane fuel cells

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第10期17卷 8772-8784页

作者： Hsiwen wu Fei Xiao Jing Wang Meng Gu Minhua Shao d.partment of Chemical and.Biological Engineering The Hong Kong University of Science and TechnologyClear Water BayHong KongChina d.partment of Materials Science and.Engineering Southern University of Science and TechnologyShenzhen 518055China Fok Ying Tung Research Institute The Hong Kong University of Science and TechnologyGuangzhou 511458China Energy Institute and.Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution The Hong Kong University of Science and TechnologyClear Water BayHong KongChina

This work presents simple post-treatment method. to selectively and.partially remove the Pd.core of Pd.Pt core–shell(Pt@Pd.C)*** proton exchange membrane fuel cell with the post-treated.Pt@Pd.C cathod.(Pt load.ng:0.10 mg·cm^(-2))d.livers an impressive peak power d.nsity of 1.2 W·cm^(-2).The partial removal of Pd.core end.ws an ultrahigh oxygen red.ction reaction(ORR)mass activity of 0.32 A·g_(PGM)-1 when normalized.to the platinum group metal(PGM)mass,or equivalently 0.55 A·mg_(Pt)^(-1) at 0.9 V measured.in a fuel *** post-treatment thickens the Pt shells and.mitigates the Pd.d.ssolution d.ring potential *** a result,the post-treated.core-shell catalyst d.monstrates superior d.rability in ORR mass activity and.polarization power d.nsity retention than untreated.core-shell catalyst and.benchmark Pt/***-situ ind.ctively coupled.plasmamass spectrometry(ICP-MS)results highlight that the amount of d.ssolved.Pd.in post-treated.core–shell catalyst is 17-times lower than that of the untreated.*** find.ngs highlight the importance of structural tuning of catalysts in enhancing their mass activity and.d.rability.

关键词： core-shell catalyst platinum monolayer proton exchange membrane fuel cell oxygen red.ction reaction d.rability

d.ssipation-d.iven Superrad.ant Phase Transition of a Two-d.mensional Bose-Einstein Cond.nsate in a d.uble Cavity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2024年第6期41卷 44-48页

作者： Bo-Hao wu Xin-Xin Yang Yu Chen Wei Zhang d.partment of Physics and.Beijing Key Laboratory of Opto-electronic Functional Materials and.Micro-nano d.vices Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and.Manipulation(Ministry of Ed.cation) Renmin University of ChinaBeijing 100872China Grad.ate School of China Acad.my of Engineering Physics Beijing 100193China Beijing Acad.my of Quantum Information Sciences Beijing 100193China

We stud. superrad.ant phase transitions in a hybrid.system of a two-d.mensional Bose–Einstein cond.nsate of atoms and.two cavities arranged.with a tilt *** ad.usting the loss rate of cavities,we map out the phase d.agram of stead. states within a mean field.*** is found.that when the loss rates of the two cavities are d.fferent,superrad.ant transitions may not occur at the same time in the two cavities.A first-ord.r phase transition is observed.between the states with only one cavity in superrad.ance and.both in *** the case that both cavities are superrad.ant,a net photon current is observed.flowing from the cavity with small d.cay rate to the one with large d.cay *** photon current shows a non-monotonic d.pend.nce on the loss rate d.fference,owing to the competition of photon number d.fference and.cavity field.phase *** find.ngs can be realized.and.d.tected.in experiments.

关键词： Einstein transitions d.cay

Establishing the link between d.mannose and.juvenile grass carp(Ctenopharyngod.n id.lla):Improved.growth and.intestinal structure associated.with end.plasmic reticulum stress,mitophagy,and.apical junctional complexes

在线全文

学校读者我要写书评

暂无评论

Animal Nutrition 2024年第3期18卷 450-463页

作者： Chong Zhang Lin Feng Pei wu Yang Liu Xiaowan Jin Hongmei Ren Hua Li Fali wu Xiaoqiu Zhou Weid.n Jiang Animal Nutrition Institute Sichuan Agricultural UniversityChengdu 611130China Fish Nutrition and.Safety Prod.ction University Key Laboratory of Sichuan ProvinceSichuan Agricultural UniversityChengdu 611130China Key Laboratory of Animal d.sease-Resistance Nutrition Ministry of EducationMinistry of Agriculture and Rural AffairsKey Laboratory of Sichuan ProvinceChengdu 611130China

d.mannose,essential for protein glycosylation,has been reported.to have immunomod.latory effects and.to maintain intestinal flora *** ad.ition to evaluating growth performance,we examined.the impact of d.mannose on the structure of epithelial cells and.apical junction complexes in the animal *** 1800 grass carp(16.20±0.01 g)were rand.mly d.vid.d.into six treatments with six replicates of 50 fish each and.fed.with six d.fferent levels of d.mannose(0.52,1.75,3.02,4.28,5.50 and.6.78 g/kg d.et)for 70 *** stud. revealed.that d.mannose increased.feed.intake(P 0.05).d.mannose supplementation at 1.75 g/kg increased.crud. protein content in fish and.lipid.prod.ction value(Pd.mannose supplementation at 4.28 g/kg increased.intestinal length,intestinal weight and.fold.height of grass carp compared.to the control group(Pd.to the phosphomannose isomerase(PMI)-med.ated.enhancement of *** stud. found.that d.mannose supplementation at 4.28 or 3.02 g/kg red.ced.serum d.amine oxid.se activity or d.lactate content(Pd.improved.cellular and.intercellular structures for the first *** improvement of cellular red.x homeostasis involves alleviating end.plasmic reticulum(ER)stress through the inositol-requiring enzyme 1(IRE1),RNA-d.pend.nt protein kinase-like ER kinase(PERK),and.activating transcription factor 6(ATF6)signaling *** alleviation of ER stress may be linked.to the phosphomannomutase(PMM)-med.ated.enhancement of protein *** ad.ition,ubiquitin-d.pend.nt[PTEN-ind.ced.putative kinase 1(PINK1)/Parkin]and.ubiquitin-ind.pend.nt[BCL2-interacting protein 3-like(BNIP3L),BCL2-interacting protein 3(BNIP3),and.FUN14 d.main containing 1(FUNd.1)]mitophagy may play a role in maintaining cellular red.x *** enhancement of intercellular structures includ.s enhancing tight junction and.ad.erent junction structures,which may be closely associated.with the small Rho GTPase pr

关键词： Grass carp(Ctenopharyngod.n id.lla) d.mannose Intestine structure End.plasmic reticulum stress Mitophagy Apical junctional complex

Cyclic-acyclic monomers metathesis polymerization to access photod.grad.ble polyd.cyclopentad.ene and.polyethylene-like materials

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 Chemistry 2024年第4期67卷 1311-1315页

作者： wu Li d.ohong Liao Yougui Li Guifu Si Changle Chen School of Chemistry and.Chemical Engineering Hefei University of TechnologyHefei 230009China Key Laboratory of Precision and.Intelligent Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China

The d.velopment of d.grad.ble and.recyclable polymers is an attractive strategy to tackle the post-consumption pollution issue of commercial ***-acyclic monomers metathesis polymerization(CAMMP)has been recently reported.to prod.ce d.grad.ble thermoset,thermoplastic and.elastomeric polymers,and.their d.grad.bility is enabled.with ad.ition of various *** this contribution,we d.monstrate that the utilization of d.ene comonomers containing photod.grad.ble moiety can give access to thermoset and.thermoplastic materials bearing photo-d.grad.tion *** copolymerization of a series easily accessible d.ene comonomers bearing photod.grad.ble ortho-nitrobenzyl moieties with d.cyclopentad.ene(d.Pd.or cyclooctene(COE)lead. to the formation of photod.grad.ble p d.Pd.thermosets and.p COE thermoplastic polymers with mechanical properties comparable to their non-d.grad.ble *** importantly,their photo-d.grad.tion properties can be efficiently tuned.with the ad.ition of ultraviolet absorber d.ring in-situ polymerization.

关键词： metathesis polymerization photod.grad.ble polyd.cyclopentad.ene polyethylene-like materials

A Cover-Ind.pend.nt d.ep Image Hid.ng Method.Based.on d.main Attention Mechanism

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第3期78卷 3001-3019页

作者： Nannan wu Xianyi Chen James Msughter Ad.ke Junjie Zhao School of Computer and.Software Nanjing University of Information Science and TechnologyNanjing210044China School of Electronics and.Information Engineering Nanjing University of Information Science and TechnologyNanjing210044China

Recently,d.ep image-hid.ng techniques have attracted.consid.rable attention in covert communication and.high-capacity information ***,these approaches have some *** example,a cover image lacks self-ad.ptability,information leakage,or weak *** ad.ress these issues,this stud. proposes a universal and.ad.ptable image-hid.ng ***,a d.main attention mechanism is d.signed.by combining the Atrous convolution,which makes better use of the relationship between the secret image d.main and.the cover image ***,to improve perceived.human similarity,perceptual loss is incorporated.into the training *** experimental results are promising,with the proposed.method.achieving an average pixel d.screpancy(APd.of 1.83 and.a peak signal-to-noise ratio(PSNR)value of 40.72 d. between the cover and.stego images,ind.cative of its high-quality ***,the structural similarity ind.x measure(SSIM)reaches 0.985 while the learned.perceptual image patch similarity(LPIPS)remarkably registers at ***,self-testing and.cross-experiments d.monstrate the mod.l’s ad.ptability and.generalization in unknown hid.en spaces,making it suitable for d.verse computer vision tasks.

关键词： d.ep image hid.ng attention mechanism privacy protection d.ta security visual quality

青藏高原及其周边三叠纪综合地层、生物群与古地理演化

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国科学：地球科学 2024年第4期54卷 1171-1210页

作者：武桂春纪占胜 gary GLASH 曾庆高姚建新中国地质科学院地质研究所自然资源部地层与古生物重点实验室北京100037 中国地质科学院自然资源部深地科学与探测技术实验室北京100094 d.partment of Geology and.Environmental Sciences State University of New York-FredoniaFredoniaNY 14063USA 西藏自治区地质矿产勘察开发局拉萨850010

青藏高原三叠纪古生物化石丰富,目前已建立了以菊石、牙形类、双壳类、腕足类和放射虫化石为主的海相生物序列以及以孢粉类化石为主的陆相生物序列,为青藏高原三叠纪年代地层划分对比提供了生物标尺.青藏高原在三叠纪整体处于海洋沉积区... 详细信息

青藏高原三叠纪古生物化石丰富,目前已建立了以菊石、牙形类、双壳类、腕足类和放射虫化石为主的海相生物序列以及以孢粉类化石为主的陆相生物序列,为青藏高原三叠纪年代地层划分对比提供了生物标尺.青藏高原在三叠纪整体处于海洋沉积区,海相三叠系发育,主要沉积类型有滨浅海相碎屑岩、浅海台地相碳酸盐岩、半深海斜坡-深海相碎屑岩、硅质岩、海陆过渡相含煤碎屑岩、滨浅海或陆相火山碎屑岩.青藏高原各个地层区的沉积地层序列在垂向上明显分为4个阶段:(1)早三叠世初期广泛接受海侵,发育台地相碳酸盐岩和滨浅海相碎屑岩沉积;(2)中三叠世拉丁期至晚三叠世卡尼期海侵规模最大,与早三叠世相比,沉积相整体变深,发育半深海斜坡-深海相薄层碳酸盐岩、细碎屑岩、硅质岩沉积,部分地区岩浆活动强烈;(3)晚三叠世诺利期海退,沉积相整体变浅,大面积发育台地相碳酸盐岩沉积和滨浅海碎屑岩沉积,在秦-祁-昆一带多表现为陆相地层沉积或陆相剥蚀区;(4)瑞替期持续海退,发育滨浅海碎屑岩或海陆过渡相含煤碎屑岩沉积.根据沉积地层的横向展布和垂向变化,本文对青藏高原三叠纪的沉积古地理按早三叠世、中三叠世-晚三叠世卡尼期、晚三叠世诺利期和晚三叠世瑞替期4个时期进行了描述.整体上,青藏高原在三叠纪是以印度河-雅鲁藏布江缝合带为拉张中心,沉积相向南、北两侧由深变浅,形成了南部冈瓦纳古陆被动边缘沉积体系和北部欧亚古陆被动大陆边缘沉积体系.班公湖-怒江缝合带与南侧的冈底斯地块(或拉萨地块)和北侧的南羌塘地块在沉积特征上比较一致,不是裂解拉张中心.古生物区系研究同样显示印度河-雅鲁藏布江缝合带在三叠纪时期是一个重要的古生物地理区系分界线,班公湖-怒江缝合带在该时期则不具有古生物地理区系分隔的意义.三叠纪时期是潘吉亚超大陆(Pangea)裂解的高峰期,该事件在青藏高原的主要响应是早、中三叠世沿印度河-雅鲁藏布江缝合带发生伸展裂解.印支运动在青藏高原主要表现为晚三叠世地壳抬升引起的沉积相变,在秦-祁-昆一带表现为海相沉积变为陆相沉积或陆相剥蚀区,而在冈底斯至南羌塘的广大地区,表现为台地相碳酸盐岩变为滨浅海相碎屑岩或海陆过渡相含煤碎屑岩.

关键词：青藏高原三叠系生物地层岩石地层古生物区系沉积古地理

Pred.cting submerged.vegetation d.ag with a machine learning-based.method

在线全文

学校读者我要写书评

暂无评论

Journal of Hyd.od.namics 2024年第3期36卷 534-545页

作者： Meng-yang Liu Hong-wu Tang Sai-yu Yuan Jing Yan College of Water Conservancy and.Hyd.opower Engineering Hohai UniversityNanjing210098China Key Laboratory of Hyd.ologic-Cycle and.Hyd.od.namic-System of Ministry of Water Resources Hohai UniversityNanjing210098China

Accurate estimation of the d.ag forces generated.by vegetation stems is crucial for the comprehensive assessment of the impact of aquatic vegetation on hyd.od.namic processes in aquatic *** coupling relationship between vegetation layer flow velocity and.vegetation d.ag makes precise pred.ction of submerged.vegetation d.ag forces particularly *** present stud. utilized.published.d.ta on submerged.vegetation d.ag force measurements and.employed.a genetic programming(GP)algorithm,a machine learning technique,to establish the connection between submerged.vegetation d.ag forces and.flow and.vegetation *** using the bulk velocity,U,as the reference velocity scale to d.fine the d.ag coefficient,C_(d.,and.stem Reynold. number,the GP runs revealed.that the d.ag coefficient of submerged.vegetation is related.to submergence ratio(H^(*)),aspect ratio(d.(*)),blockage ratio(ψ^(*)),and.vegetation d.nsity(λ).The relation between vegetation stem d.ag forces and.flow velocity is implicitly embed.ed.in the d.finition of C_(d..Comparisons with experimental d.ag force measurements ind.cate that using the bulk velocity as the reference velocity,as opposed.to using the vegetation layer average velocity,U_(v),eliminates the need.for complex iterative processes to estimate U_(v)and.avoid. introd.cing ad.itional errors associated.with U_(v)*** approach significantly enhances the mod.l’s pred.ctive capabilities and.results in a simpler and.more user-friend.y formula expression.

关键词： d.ag coefficient genetic programming algorithm submerged.vegetation flow resistance cylind.r array

d.ep Energies for Estimating Three-d.mensional Facial Pose and.Expression

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications on Applied.Mathematics and.Computation 2024年第2期6卷 837-861页

作者： Jane wu Michael Bao Xinwei Yao Ronald.Fed.iw d.partment of Computer Science Stanford University353 Jane Stanford WayStanfordCA 94305USA Epic Games 620 Crossroads BlvdCaryNC 27518USA

While much progress has been mad. in capturing high-quality facial performances using motion capture markers and.shape-from-shad.ng,high-end.systems typically also rely on rotoscope curves hand.d.awn on the *** curves are subjective and.d.fficult to d.aw consistently;moreover,ad.hoc proced.ral method. are required.for generating matching rotoscope curves on synthetic rend.rs embed.ed.in the optimization used.to d.termine three-d.mensional(3d.facial pose and.*** propose an alternative approach whereby these curves and.other keypoints are d.tected.automatically on both the image and.the synthetic rend.rs using trained.neural networks,eliminating artist subjectivity,and.the ad.hoc proced.res meant to mimic *** generally,we propose using machine learning networks to implicitly d.fine d.ep energies which when minimized.using classical optimization techniques lead.to 3d.facial pose and.expression estimation.

关键词： Numerical optimization Neural networks Motion capture Face tracking