检索结果-南通市图书馆

Macroscopic and microscopic mechanical behaviors of climbing tendrils

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

Acta Mechanica sinica 2019年第3期35卷 702-710页

作者： Q.Guo j.j.dong Y.Liu X.H.Xu Q.H.Qin j.s.Wang Tianjin Key Laboratory of Modern Engineering Mechanics Department of MechanicsTianjin UniversityTianjin 300054China state Key Laboratory of Nonlinear Mechanics (LNM) Institute of MechanicsChinese Academy of ScienceBeijing 100080China Research school of Engineering Australian National UniversityCanberraACT 2601Australia

Tendril-bearing climbing plants must recur to the tendril helices with chiral perversion or dual chirality for climbing and to obtain sun exposure. Despite researchers' prolonged fascination with climbing tendrils since Darwin's time and even earlier, why the soft and slender tendrils can bear heavy loads such as the self-weight of a plant or additional load caused by rain remains elusive. In this paper, we take towel gourd tendrils as an example and investigate the macroscopic and microscopic mechanical behaviors of tendrils through experiments and simulations. Our study indicates that the tendril filament exhibits rubber-like hyperelastic behaviors and can particularly endure large elongation, which is mainly attributed to the superelasticity of the cellulose fibril helix contained in the cell wall. Combination of the tendril helical structure with dual chirality or chiral perversion at a macroscale and a cellulose filament helix at a subcellular level creates superior elasticity for biological species relying on support and climbing. This study provides deep insight into the structure-property relationship of climbing tendrils, and the relationship is useful for the bioinspired design of composite systems with superior elasticity.

关键词： Climbing tendril Mechanical behaviors structure-property relationship Large elongation

Ferrielectricity in DyMn_(2)O_(5):A golden touchstone for multiferroicity of RMn_(2)O_(5) family

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 Advanced Dielectrics 2015年第2期5卷 29-46页

作者： j.-M.Liu s.dong Laboratory of solid state Microstructures and Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093P.R.China Department of Physics Southeast UniversityNanjing 211189P.R.China

The RMn_(2)O_(5) manganite compounds represent one class of multiferroic family with magnetic origins,which has been receiving continuous attention in the past *** far,our understanding of the magnetic origins for ferroelectricity in RMn_(2)O_(5) is associated with the nearly collinear antiferromagnetic structure of Mn ions,while the exchange striction induced ionic displacements are the consequence of the spin frustration *** this scenario may be applied to almost all RMn_(2)O_(5) members,its limitation is either clear:the temperature-dependent behaviors of electric polarization and its responses to external stimuli are seriously materials *** inconsistences raise substantial concern with the state-of-the-art physics of ferroelectricity in RMn_(2)O_(5).In this mini-review,we present our recent experimental results on the roles of the 4f moments from R ions which are intimately coupled with the 3d moments from Mn ***_(2)O_(5) is a golden figure for illustrating these *** is demonstrated that the spin structure accommodates two nearly collinear sublattices which generate respectively two ferroelectric(FE)sublattices,enabling DyMn_(2)O_(5) an emergent ferrielectric(FIE)system rarely identified in magnetically induced *** evidence is presented from several aspects,including FIE-like phenomena and magnetoelectric responses,proposed structural model,and experimental check by nonmagnetic substitutions of the 3d and 4f *** perspectives regarding possible challenges in understanding the multiferroicity of RMn_(2)O_(5) as a generalized scenario are discussed.

关键词： RMn_(2)O_(5) multiferroic ferrielectricity 3d-4f coupling exchange striction.

Characterization of intraocular pressure pattern and changes of retinal ganglion cells in DBA2j glaucoma mice

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International journal of Ophthalmology(English edition) 2016年第2期9卷 211-217页

作者： jing Wang Yu dong Cullen Eye Institute Baylor College of Medicine

AIM： To characterize the pattern of intraocular pressure （lOP） change and the deficit of retinal ganglion cells （RGCs） in DBA2j, which is most well-characterized chronic glaucoma mouse model and wild type （WT） C57bl/6 mice, and to study the relationship between lOP change and RGCs deficit. METHODs： lOP was monitored with a rebound tonometer in C57bl/6 and DBA2j mice from 3 to 15-month-old. Retinal function was evaluated by dark -adapted electroretinogram （ERG） in DBA2j and WT mice of 15-month-old. A dye （Neurobiotin） was applied to optic nerve stump to retrograde label RGCs. TO-PRO-3 visualized all nuclei of cells in the RGC layer. REsULTs： The lOP in WT mice was 9.03-0.6 mm Hg on average and did not increase significantly as aging. The lOP in DBA2j mice, arranging from 7.2 to 28 mm Hg, was increasing significantly as aging, and it was normal at 3-month--old compared with WT mice, slightly increased from 7-month-old and increased in 50% animals at 11-month-old and in 38% animals at 15-month-old. The RGCs density in DBA2j mice started reducing by 7-month-old, continuously decreased until reached about 20% of RGC in WT retina by 15-month-old. RGC density was not linearly correlated with lOP in 15-month- old DBA2j mice. The amplitude of positive scotopic threshold response, and negative scotopic threshold response of ERG were significantly reduced in DBA2j mice of 15-month-old than that in age-paired WT mice. CONCLUsION： The present study found that DBA2j mice display pathological and functional deficits of the retina that was not linearly correlated with lOP.

关键词： retinal ganglion cell glaucoma intraocularpressure retina mouse

Chatter identification of thin-walled parts for intelligent manufacturing based on multi-signal processing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Manufacturing 2021年第1期9卷 22-33页

作者： dong-dong Li Wei-Min Zhang Yuan-shi Li Feng Xue jürgen Fleischer school of Mechanical Engineering Tongji UniversityShanghai 201804People's Republic of China Bosch Rexroth Endowed Chair for Automation&Electrification solutions Sino-German College for Postgraduate StudyTongji UniversityShanghai 201804People's Republic of China China North Engine Research Institute Tianjin 300400People's Republic of China WBK Institute of Production science Karlsruhe Institute of TechnologyKarlsruhe 76131Germany

Machine chatter is still an unresolved and challenging issue in the milling process,and developing an online chatter identification and process monitoring system towards smart manufacturing is an urgent *** this paper,two indicators of chatter detection are *** is the real-time variance of milling force signals in the time domain,and the other one is the wavelet energy ratio of acceleration signals based on wavelet packet decomposition in the frequency ***,a novel classification concept for vibration condition,called slight chatter,is proposed and integrated successfully into the designed multi-classification support vector machine(sVM)***,a mapping model between image and chatter indicators is established via a distance threshold on the *** multi-sVM model is trained by the results of three signals as an *** data and detection accuracy of the sVM model are verified in actual *** identification accuracy of 96.66%has proved that the proposed solution is feasible and *** presented method can be used to select optimized milling parameters to improve machining process stability and strengthen manufacturing system monitoring.

关键词： Chatter Milling force Acceleration Wavelet packet decomposition Multi-sensor

Clinical,laboratory,and therapeutic differences between immunoglobulin E-mediated and non-immunoglobulin E-mediated cow’s milk protein allergy in children

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 Clinical Pediatrics 2025年第1期14卷 78-92页

作者： Hasan M Isa Marwa j Abdulnabi Nawra s Naser Fatema N Lahmda Noor M AlAnsari Zahra H Isa Afaf M Mohamed Department of Pediatrics Salmaniya Medical ComplexManama 26671Bahrain Department of Pediatrics Arabian Gulf UniversityManama 26671Bahrain Faculty of Medicine Mansoura UniversityMansoura 35516Egypt Public Health Directorate Ministry of HealthManama 26671Bahrain

BACKGROUND Although breast milk is ideal for newborns,in some cases,it is replaced with cow’s milk,which contains proteins that increase the risk of cow’s milk protein allergy(CMPA).AIM To evaluate CMPA prevalence in Bahrain and compare clinical characteristics of children with immunoglobulin E(IgE)-and non-IgE-mediated *** This retrospective cohort study examined children with CMPA diagnosed at the pediatric gastroenterology outpatient clinic of the salmaniya Medical Complex,Bahrain,between 2014 and 2022,and assessed CMPA *** presentations,laboratory findings,dietary modifications,and outcomes were compared between children with IgE-mediated and non-IgE-mediated *** variables were compared using Fisher’s exact test or Pearson’sχ2 test,whereas continuous variables were compared using student’s t-test or the Mann-Whitney U *** Of 8332 patients,6022(72.3%)adhered to their *** them,618(10.3%)were suggested of having CMPA and 595(96.3%)were included;CMPA prevalence was 2%.Most patients were Bahraini(93.8%)and males(55.3%).Non-IgE-mediated type accounted for 77.3%cases and IgE-mediated type,22.7%.IgE-mediated CMPA presented more in boys(P=0.030),and later in life(5.1 months±4.5 months vs 4.2 months±4.2 months,P=0.016,95%CI:0.08-1.73),had more associated diseases(Psented with more cutaneous(P=0.024)and respiratory(P=0.003)manifestations,severe symptoms[rash/dry skin(P=0.031),facial swelling/angioedema(P=0.003),failure to thrive(P=0.013),apparent life-threatening event(Psitive physical findings(P=0.002)than non-IgE-mediated *** patients were exclusively fed cow milk formula(50.3%).The amino acid-based formula(AAF)was most prescribed(60.5%)with no difference between the two types(P=0.173).Although breastfeeding was recommended to 49.6%,only 8.2%were exclusively ***-mediated CMPA was associated with a longer follow-up duration than non-IgE-mediated CMPA(17.3 months±14.0 mo

关键词： Children Milk allergy Immunoglobulin E Breastfeeding Infant formula Bahrain

Ultrasonic-based surface patterning and interfacial reaction of ZrO_(2)ceramics

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 Materials science & Technology 2023年第24期155卷 202-210页

作者： H.j. dong Z.L. Li X.G.song j.C. Feng s.j. Wei j.H. Fu Y. shi state Key Laboratory of Advanced Welding and joining Harbin Institute of Technology Harbin 150001 China shandong Provincial Key Lab of special Welding Technology Harbin Institute of Technology at Weihai Weihai 264209 China

We demonstrate a process to achieve selective surface metallization of ZrO_(2)ceramics using ultrasound technology in atmospheric environments at 350℃,which bestows good weldability of ZrO_(2)to achieve rapid and reliable connections with other metals as well as ceramic *** challenge is that brazing or diffusion welding processes to accomplish metallurgical connections for ZrO_(2) typically require holding at elevated temperatures for minutes to hours,while the selective ultrasonic metallization process requires only a few seconds of processing without the application of covering films or solder *** this study,the selected sn-2Ti alloy could effectively wet and spread on ZrO_(2)substrate under ultrasonication,and continuous interphase layers were rapidly formed in situ between ZrO_(2)and *** bonding strength for the ZrO_(2)/sn-2Ti interface was well established with the highest shear strength of 37.1 MPa,and the fracture location occurred at the filler *** interfacial reaction layer thickened remarkably with the prolongation of sonication,accompanied by the partial crystallization of amorphous TiO and the formation of irregularly striped Ti_(11.31)sn_(3)O_(10)nanocrystals.

关键词： selective ultrasonic metallization Zirconia surface patterning Low temperature connection sono-oxidation Interfacial reaction

PHAsE TRANsFORMATION AND CHARACTERIsTICs IN FRECKLE AREAs FOR INCONEL 625 sUPERALLOY

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica sinica(English Letters) 2005年第1期18卷 47-54页

作者： j.X.dong M.C.Zhang Y.P.Zeng X.s.Xie UniversityofscienceandTechnologyBeijing Beijing100083China

The freckle formation and their phase characterizatics in freckle areas were investigated by means of microstructure analysis approaches and a thermodynamic equilibrium phase calculation method in an Inconel 625 allay. These results show that in freckle areas a large number of M6C, MC, Laves and δ phases precipitate in grain boundaries even within grain due to the enrichment and segregation of Mo and Nb during solidification, which results in almost of these freckle areas covered by these complex precipitated phases and induces small grains in freckle areas. Equilibrium phase and liquid segregation calculation can give a reasonable interpretation of the freckle feature for this alloy.

关键词： freckle superalloy Inconel 625 thermodynamic calculation

Tetrapartite entanglem ent features of W-C lass state in uniform acceleration

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

Frontiers of physics 2020年第1期15卷 1-8页

作者： Qian dong Ariadna j.Torres-Arenas Guo-Hua sun shi-Hai dong Laboratorio de Informacion Cuantica CIDETECInstituto Politecnico NacionalUPALMCDMX 07700Mexico Catedratica CONACyT Centro de Investigacion en ComputacionInstituto Politecnico NacionalUPALMCDMX 07738Mexico

Using the single-mode approximatiou,we first calculate entanglement measures such as negativity(1-3 and 11 tangles)and von Neumann entropy for a tetrapartite W-Class system in noninertial fiarne and then anal^e the whole entanglement measures,the residualπ4 and geometricП4 average of *** that the difference betweenπ4 andП4 is very small or disappears with the increasing accelerated *** entanglement properties are compared among the different cases from oue accelerated observer to four accelerated *** results show that there still exists entanglement for the complete system even when accelemtion r tends to *** degree of entanglement is disappeared for the 1-1 tangle case when the acceleration r>*** reexamine the Unriih effect in noninertiai *** is shown that the entanglement system in which only one qubit is accelerated is more robust than those eutangled systems in whicli two or three or four qubits are *** is also found that the von Neumann entropy s of the total system always increases with the increasing accelerated observers,but the sκξand sκζδwith two and three involved noniuertial qubits first increases and then decreases with the acceleration parameter r,but they are equal to constants 1 and 0.811278 respectively for zero involved iioniiiertial qubit.

关键词： tetrapartite W-Class state entanglement Dirac field noninertiai frames

Gene therapy for spinal muscular atrophy:perspectives on the possibility of optimizing sMN1 delivery to correct all neurological and systemic perturbations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第7期20卷 2011-2012页

作者： sharon j.Brown Rafael j.Yáñez-Muñoz Heidi R.Fuller school of Pharmacy and Bioengineering Keele UniversityKeeleUK Wolfson Center for Inherited Neuromuscular Disease TORCH BuildingRJAH Orthopaedic HospitalOswestryUK *** Center of Gene and Cell TherapyDepartment of Biological SciencesSchool of Life Sciences and the EnvironmentRoyal Holloway University of LondonEghamUK

spinal muscular atrophy(sMA)is a genetic condition that results in selective lower motor neuron loss with concomitant muscle weakness and *** genetic cause of sMA was understood in 1995 when loss or impairment of the survival motor neuron 1(sMN1)gene was identified as the main contributing factor(Lefebvre et al.,1995).This,in combination with the discovery that humans have a“back-up”gene,sMN2,which can produce low levels(approximately 10%)of the full-length functional sMN protein,has led to the generation of sMA-specific gene *** was traditionally classified according to age of symptom onset and developmental milestones achieved,with life expectancy and severity varying between ***,sMN2 copy number is used as a proxy for the prediction of disease severity,with higher sMN2 copy number typically being associated with reduced severity of sMA,although this relationship is not absolute:some individuals with low sMN2 copy number have less severe sMA phenotypes and vice ***,the etiology of sMA is further complicated by other factors,such as non-typical nucleotide variants and sMN2-independent modifiers of disease severity.

关键词： atrophy traditionally absolute