检索结果-南通市图书馆

Symmetric and Anti-Symmetric Solitons of the Fractional Second- and Third-Order Nonlinear Schrodinger Equation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2021年第9期38卷 18-21页

作者： qi-Hao Cao Chao-qing Dai College of Optical Mechanical and Electrical EngineeringZhejiang A&F UniversityLin’an 311300China

The fractional second-and third-order nonlinear Schrodinger equation is studied,symmetric and antisymmetric soliton solutions are derived,and the influence of the Levy index on different solitons is *** stability and stability interval of solitons are *** anti-interference ability of stable solitons to the small disturbance shows a good robustness.

关键词： solitons stability soliton

Health correlates, addictive behaviors, and peer victimization among adolescents in China

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2018年第5期14卷 454-460页

作者： qi-qi Chen Meng-Tong Chen Yu-Hong Zhu Ko Ling Chan Patrick Ip Department of Applied Social Sciences The Hong Kong Polytechnic UniversityHung HomHong KongChina Department of Social Work Renmin University of ChinaHaidianBeijingChina Department of Pediatrics and Adolescent Medicine The University of Hong KongPokfulamHong KongChina

Background Peer victimization has been recognized as a common social problem affecting children and adolescents in all parts of the world. This study aims to examine the prevalence of different types of peer victimization and to evaluate the associations between peer victimization and health correlates. Methods Using a large population sample of 18,341 adolescents aged 15–17 years from 6 cities in China, this study esti-mated the prevalence of different types of peer victimization, addictive behaviors, and health-related variables with self-administrated questionnaires. A three-phase logistical regression analysis was conducted to investigate the associations between peer victimization and addictive behaviors as well as health-related factors among adolescents. Results A total of 42.9% of the surveyed Chinese adolescents have been bullied by peers, with boys reporting higher rate on overt victimization (36.9%) and girls on relational forms (33.9%). School environment (34.7%) was the most frequent scene of peer violence, followed by neighborhood, family, and internet. Addictive behaviors except substance abuse were found related to higher possibility of peer victimization (aOR 1.21–1.73, P<0.001). Peer victimization was significantly associated with more depressive symptoms, post-traumatic stress disorder symptoms, and suicide ideation and deliberate self-harm (aOR 1.05–2.27, P<0.001), and poorer self-esteem and health-related quality of life (aOR 0.95–0.97, P<0.001). Conclusion Possible explanations of the associations found in this study are discussed and implications for future services are raised.

关键词： Addictive behavior Adolescent Health Peer victimization

Three-dimensional architectures based on carbon nanotube bridged Ti_(2)C MXene nanosheets for Li-S batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2021年第4期19卷 139-145页

作者： qinhua Gu Ming Lu Junnan Chen Yujie qi Bingsen Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal UniversityChangchun 130103China

Lithium-sulfur(Li-S)batteries are promising candidates for high density electrochemical energy storage ***,the poor conductivity of S and the shuttle effect of polysulfides are a bottleneck to practical ***,a three-dimensional architecture,based on carbon nanotube(CNT)bridged Ti_(2)C MXene nanosheets,was constructed as a sulfur *** architecture was based on Ti atoms,which can chemically absorb *** CNTs are highly conductive and intercalate into the MXene nanosheets to prevent their stacking and construct an interspace for *** hybrid,as a host of S,can effectively alleviate the shuttle effect through a combination of physical confinement and chemical *** resulted in an open internal space,which served as a cathode for the loaded S to promote electron transport and enhance electrochemical kinetics of the polysulfide conversion in Li-S batteries.

关键词： Li-S batteries Shuttle effect MXene Polysulfides Three-dimensional(3D)architecture

Bifurcation analyses and hardware experiments for bursting dynamics in non-autonomous memristive FitzHugh-Nagumo circuit

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(Technological Sciences) 2020年第6期63卷 1035-1044页

作者： CHEN Mo qi JianWei WU HuaGan XU Quan BAO BoCheng School of Information Science and Engineering Changzhou UniversityChangzhou 213164China

In this paper,a non-autonomous memristive Fitz Hugh-Nagumo(FHN)circuit is constructed using a second-order memristive diode bridge with LC *** convenience of circuit implementation,an AC voltage source is adopted to substitute the original AC current *** by the slowly varying AC voltage source,the number,locations and stabilities of the equilibrium points slowly evolve with the time,which are thus indicated as the AC equilibrium *** sequences of fold and/or Hopf bifurcations are encountered in a full period of time series evolutions,leading to various kinds of chaotic or periodic bursting *** figure out the related bifurcation mechanisms,the fold and Hopf bifurcation sets are mathematically formulated to locate the critical bifurcation *** this basis,the transitions between the resting and repetitive spiking states are clearly illustrated by the time series of the AC equilibrium points and state variables,from which Hopf/sub Hopf,Hopf/Hopf,and Hopf/fold bursting oscillations are identified in the specified parameter ***,based on a fabricated hardware circuit,the experimental measurements are *** results verify that the presented memristive FHN circuit indeed exhibits complex bursting activities,which enriches the family of memristor-based FHN circuits with bursting dynamics.

关键词： Fitz Hugh-Nagumo circuit memristive diode bridge bursting AC equilibrium point

Advantages of Rho-associated kinases and their inhibitor fasudil for the treatment of neurodegenerative diseases

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2022年第12期17卷 2623-2631页

作者： qing Wang Li-Juan Song zhi-Bin Ding zhi Chai Jie-Zhong Yu Bao-Guo Xiao Cun-Gen Ma Research Center of Neurobiology The Key Research Laboratory of Benefiting Qi for Acting Blood Circulation Method to Treat Multiple Sclerosis of State Administration of Traditional Chinese MedicineShanxi University of Chinese MedicineJinzhongShanxi ProvinceChina Department of Physiology Shanxi Medical UniversityTaiyuanShanxi ProvinceChina Institute of Brain Science Shanxi Key Laboratory of Inflammatory Neurodegenerative DiseasesShanxi Datong UniversityDatongShanxi ProvinceChina Department of Neurology Datong Fifth People’s HospitalDatongShanxi ProvinceChina Institute of Neurology Huashan HospitalInstitutes of Brain Science and State Key Laboratory of Medical NeurobiologyFudan UniversityShanghaiChina

Ras homolog(Rho)-associated kinases(ROCKs)belong to the serine-threonine kinase family,which plays a pivotal role in regulating the damage,survival,axon guidance,and regeneration of *** are also involved in the biological effects of immune cells and glial cells,as well as the development of neurodegenerative disorders such as Alzheimer’s disease,Parkinson’s disease,and multiple *** studies by us and others confirmed that ROCKs inhibitors attenuated the symptoms and progression of experimental models of the abovementioned neurodegenerative diseases by inhibiting neuroinflammation,regulating immune imbalance,repairing the blood-brain barrier,and promoting nerve repair and myelin ***,the first ROCKs inhibitor to be used clinically,has a good therapeutic effect on neurodegenerative *** increases the activity of neural stem cells and mesenchymal stem cells,thus optimizing cell *** review will systematically describe,for the first time,the effects of abnormal activation of ROCKs on T cells,B cells,microglia,astrocytes,oligodendrocytes,and pericytes in neurodegenerative diseases of the central nervous system,summarize the therapeutic potential of fasudil in several experimental models of neurodegenerative diseases,and clarify the possible cellular and molecular mechanisms of ROCKs *** review also proposes that fasudil is a novel potential treatment,especially in combination with cell-based *** from this review add support for further investigation of ROCKs and its inhibitor fasudil for the treatment of neurodegenerative diseases.

关键词： Alzheimer’s disease cell-based therapy central nervous system cells fasudil immunocytes multiple sclerosis Parkinson’s disease pericytes Rho kinase inhibitor Rho-associated kinases

Multiply Kink and Anti-Kink Solutions for a Coupled Camassa–Holm Type Equation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2016年第12期65卷 609-614页

作者： Yuan-Li Li qi-Lao Zha College of Mathematics Science Inner Mongolia Normal University Huhhot 010022 China

This article amis at revealing dynamical behavior of a coupled Camassa–Holm type equation, which was proposed by Geng and Wang based on a 4×4 matrix spectral problem with two potentials. Its kink and anti-kink solutions are presented explicitly. In particular, some exact multi-kink and anti-kink wave solutions are discussed and under some conditions, the kink and anti-kinks look like hat-shape solitons. The dynamic characters of the obtained solutions are investigated by figures. The method used in this paper can be widely applied to looking for the multi-kinks for Camassa–Holm type equations possessing cubic nonlinearity.

关键词： kink solution dynamic behavior coupled Camassa–Holm type equation

Near-zero Poisson's ratio and suppressed mechanical anisotropy in strained black phosphorene/SnSe van der Waals heterostructure:a first-principles study

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2022年第5期43卷 627-636页

作者： qi REN Xingyao WANG Yingzhuo LUN Xueyun WANG Jiawang HONG School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

Black phosphorene(BP)and its analogs have attracted intensive attention due to their unique puckered structures,anisotropic characteristics,and negative Poisson’s *** van der Waals(vdW)heterostructures assembly by stacking different materials show novel physical properties,however,the parent materials do not *** this work,the first-principles calculations are performed to study the mechanical properties of the vdW ***,a near-zero Poisson’s ratio ν_(zx)is found in BP/SnSe *** addition,compared with the parent materials BP and SnSe with strong in-plane anisotropic mechanical properties,the BP/SnSe heterostructure shows strongly suppressed *** results show that the vdW heterostructure has quite different mechanical properties compared with the parent materials,and provides new opportunities for the mechanical applications of the heterostructures.

关键词： van der Waals(vdW)heterostructure Poisson’s ratio in-plane anisotropy first-principles method

Surfactant-assisted crystallization of lysozyme and its mechanism

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第7期90卷 199-208页

作者： Yujie Song Rongfei Ren Min Su zhihan Liang qi Hao School of Chemical Engineering Hebei University of TechnologyTianjin 300130China

Surfactants were used to assist in the crystallization of *** types of surfactants with different structures(sodium dodecyl sulfate,cetyltrimethylammonium bromide,or betaine hydrochloride[BH])were *** study indicated that three surfactants were all capable of shortening the crystallization induction time of lysozyme,with BH inducing the shortest crystallization induction time(t=1 min)and the largest crystal size(37μm).The molecular interactions among each of the three surfactants aforementioned and lysozyme were also investigated by *** was found that hydrogen bonding dominantly acted between the carboxyl structure of the surfactant BH and the lysozyme,which produced the most favorable conformation for the self-assembly of lysozyme(promote lysozyme orderly aggregation and shorten the crystallization induction time).On this basis,the mechanism of surfactant-promoted lysozyme crystallization was proposed.

关键词： Protein Crystallization Surfactant Lysozyme Molecular interaction Mechanism

Application of Visible/Near-Infrared Spectroscopy and Hyperspectral Imaging with Machine Learning for High-Throughput Plant Heavy Metal Stress Phenotyping:A Review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Phenomics 2023年第4期5卷 657-672页

作者： Yuanning Zhai Lei Zhou Hengnian qi Pan Gao Chu Zhang School of Information Engineering Huzhou UniversityHuzhou 313000China College of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing 210037China College of Information Science and Technology Shihezi UniversityShihezi 832003China

Heavy metal pollution is becoming a prominent stress on *** contaminated with heavy metals undergo changes in external morphology and internal structure,and heavy metals can accumulate through the food chain,threatening human *** heavy metal stress on plants quickly,accurately,and nondestructively helps to achieve precise management of plant growth status and accelerate the breeding of heavy metal-resistant plant *** chemical reagent-based detection methods are laborious,destructive,time-consuming,and *** internal and external structures of plants can be altered by heavy metal contamination,which can lead to changes in plants'absorption and reflection of ***/near-infrared(V/NIR)spectroscopy can obtain plant spectral information,and hyperspectral imaging(HSI)can obtain spectral and spatial information in simple,speedy,and nondestructive *** 2 technologies have been the most widely used high-throughput phenotyping technologies of *** review summarizes the application of V/NIR spectroscopy and HSI in plant heavy metal stress phenotype analysis as well as introduces the method of combining spectroscopy with machine learning approaches for high-throughput phenotyping of plant heavy metal stress,including unstressed and stressed identification,stress types identification,stress degrees identification,and heavy metal content *** vegetation indexes,full-range spectra,and feature bands identified by different plant heavy metal stress phenotyping methods are *** advantages,limitations,challenges,and prospects of V/NIR spectroscopy and HSI for plant heavy metal stress phenotyping are *** studies are needed to promote the research and application of V/NIR spectroscopy and HSI for plant heavy metal stress phenotyping.

关键词： Infrared consuming precise