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Self-folding mechanics of graphene tearing and peeling from a substrate

Frontiers of physics 2018年第3期13卷 17-28页

作者： ze-zhou he Yin-Bo Zhu heng-An Wu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei 230027 China

Understanding the underlying mechanism in the tearing and peeling processes of graphene is crucial for the further hierarchical design of origami-like folding and kirigami-like cutting of graphene. How- ever, the complex effects among bending moduli, adhesion, interlayer interaction, and local crystal structure during origami-like folding and kirigami-like cutting remain unclear, resulting in challenges to the practical applications of existing theoretical and experimental findings as well as to potential manipulations of graphene in metamaterials and nanodevices. Toward this end, classical molecular dynamics （MD） simulations are performed with synergetie theoretical analysis to explore the tearing and peeling of self-folded graphene from a substrate driven by external force and by thermal activation. It is found that the elastic energy localized at the small folding ridge plays a significant role in the crack trajectory. Due to the extremely small bending modulus of monolayer graphene, its taper angle when pulled by an external force follows a scaling law distinct from that in case of bilayer graphene. With the increase in the initial width of the folding ridge, the self-folded graphene, motivated by thermal fluctuations, can be self-assembled by spontaneous self-tearing and peeling from a substrate. Simultaneously, the scaling law between the taper angle and adhesive energy is independent of the motivations for thermal activation-induced self-assembly and external force tearing, providing effective insights into the underlying physics for graphene-based origami-like folding and kirigami-like cutting.

关键词： graphene tearing self-assembly elastic energy molecular dynamics simulation

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Synthesis,Antibacterial and Antifungal Activities of Novel Benzimidazole Cyclophanes

Synthesis,Antibacterial and Antifungal Activities of Novel B...

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全国第十四届大环化学暨第六届超分子化学学术讨论会

作者： MENG Jiang-Ping FANG Bo SONG Chun-ze zhou Cheng-he~* School of Chemistry and Chemical Engineering,Southwest University,Chongqing(400715)

Novel benzimidazole cyclophanes were designed,synthesized and evaluated for antibacterial and antifungal activities against Staphylococcus aureus,Escherichia coli,Pseudomonas aeruginosa,Bacillus subtilis,Bacillus proteus,Candida albicans and Aspergillus *** of the synthesized compounds exhibited significant antibacterial *** structures of these new compounds are measured by IR,MS,H,C and DEPT NMR,H-H COSY and/or H-C COSY spectra.

关键词： benzimidazole cyclophane antibacterial

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Bioinspired Passive Tactile Sensors Enabled by Reversible Polarization of Conjugated Polymers

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Nano-Micro Letters 2025年第1期17卷 361-377页

作者： Feng he Sitong Chen Ruili zhou Hanyu Diao Yangyang Han Xiaodong Wu School of Mechanical Engineering Sichuan UniversityChengdu 610065People’s Republic of China School of Software Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065People’s Republic of China State Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu 610065People’s Republic of China

Tactile perception plays a vital role for the human body and is also highly desired for smart prosthesis and advanced *** to active sensing devices,passive piezoelectric and triboelectric tactile sensors consume less power,but lack the capability to resolve static ***,we address this issue by utilizing the unique polarization chemistry of conjugated polymers for the first time and propose a new type of bioinspired,passive,and bio-friendly tactile sensors for resolving both static and dynamic ***,to emulate the polarization process of natural sensory cells,conjugated polymers(including poly(3,4-ethylenedioxythiophen e):poly(styrenesulfonate),polyaniline,or polypyrrole)are controllably polarized into two opposite states to create artificial potential *** controllable and reversible polarization process of the conjugated polymers is fully in situ ***,a micro-structured ionic electrolyte is employed to imitate the natural ion channels and to encode external touch stimulations into the variation in potential difference *** with the currently existing tactile sensing devices,the developed tactile sensors feature distinct characteristics including fully organic composition,high sensitivity(up to 773 mV N^(−1)),ultralow power consumption(nW),as well as superior *** demonstrations,both single point tactile perception(surface texture perception and material property perception)and two-dimensional tactile recognitions(shape or profile perception)with high accuracy are successfully realized using self-defined machine learning *** tactile sensing concept innovation based on the polarization chemistry of conjugated polymers opens up a new path to create robotic tactile sensors and prosthetic electronic skins.

关键词： Passive tactile sensors Reversible polarization of conjugated polymers Tactile perception Machine learning algorithm Object recognition

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公路路线测量PDA程序设计方法

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西部交通科技 2008年第6期 30-35页

作者：周泽和黄丽华广西交通规划勘察设计研究院

利用PDA配合全站仪进行公路路线勘察测量可以大大提高工作效率。PDA测量程序利用***进行开发,其特点是程序可视化高,计算速度快,操作简便,使用方法与电脑操作类似;并且由于PDA存储量大,可对测量数据直接记录,减少内业工作量,摆脱了传统P... 详细信息

利用PDA配合全站仪进行公路路线勘察测量可以大大提高工作效率。PDA测量程序利用***进行开发,其特点是程序可视化高,计算速度快,操作简便,使用方法与电脑操作类似;并且由于PDA存储量大,可对测量数据直接记录,减少内业工作量,摆脱了传统PC-E500及Casio-fx4800等测量方法的许多不足。文章介绍了该程序设计流程及方法。

关键词： PDA测量程序全站仪程序设计路线坐标计算

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长短桩粉煤灰复合地基承载特性试验研究

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武汉理工大学学报 2024年第9期46卷 78-86页

作者：周盛全周泽和章昊琎成泽林安徽理工大学土木建筑学院淮南232000 同济大学土木工程学院上海200092

为了研究长短结合下的复合地基承载特性,开展以水泥-粉煤灰搅拌桩(Cement-fly ash mixing pile, CFMP)为承载桩的长短桩粉煤灰复合地基室内模型试验,从地基沉降变形、长短桩桩身应力、桩间粉煤灰应力及桩土应力比等方面出发,结合中性面... 详细信息

为了研究长短结合下的复合地基承载特性,开展以水泥-粉煤灰搅拌桩(Cement-fly ash mixing pile, CFMP)为承载桩的长短桩粉煤灰复合地基室内模型试验,从地基沉降变形、长短桩桩身应力、桩间粉煤灰应力及桩土应力比等方面出发,结合中性面及承载力计算公式对长短桩粉煤灰复合地基的承载机制和荷载传递原理进行分析,研究结果表明:增加长桩桩长能显著提高复合地基承载力,在实际运用中应优先考虑提升长短桩的长径比;长桩桩土应力比峰值位于复合加固区,伴随荷载增加先增大到峰值后,长桩的桩侧摩阻力及桩端阻力抗力不足,桩端处刺入明显,粉煤灰复合地基塑性变形增大后出现减小;对中性面计算公式增加调整系数μ以更贴合工程实际运用,长桩中性面处调整系数取值为μ_(1)=1.1~1.2,短桩中性面处调整系数取值为μ_(2)=0.7~0.8;针对长短桩粉煤灰复合地基承载力修正系数,复合加固区内λ_(1)为0.75~0.85,λ_(2)为0.8~0.9,β为1,单桩加固区内λ_(1)取值为0.6,β为0.6~0.7,同时为避免造成承载力浪费,可改变桩身设计以实现绿色建筑的目的。

关键词：模型试验 CFMP 长短桩承载性能修正系数

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运行车速检验在公路线形设计中的应用

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西部交通科技 2009年第2期 46-51页

作者：周泽和陈震李海斌广西交通规划勘察设计研究院广西南宁530011

文章分析了传统的路线线形设计特点及存在的问题,介绍运行车速协调性的理念在路线几何设计中的应用情况,同时按照运行车速的新理念对路线几何线形进行检验,以便在现有的设计条件下得到一个合理的线形设计方法。

关键词：运行车速线形几何设计横断面设计视距

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Silicon-based metal-organic frameworks(SiMOFs)for immunogenic cell death in cancer therapy

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Nano Research 2025年第1期18卷 628-641页

作者： Min Han Zishan Chen Shiying zhou Zunde Liao Xiangting Yi Yao he Yiling Zhong Kam W.Leong College of Pharmacy State Key Laboratory of Bioactive Molecules and Druggability AssessmentJinan UniversityGuangzhou 511443China Department of Biomedical Engineering Columbia UniversityNew YorkNY 10027USA Institute of Functional Nano and Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China

Silicon-based nanomaterials,known for their unique properties and favorable biocompatibility,significantly impact sectors like energy,electronics,and ***,metalorganic frameworks(MOFs)have emerged as promising candidates for biomedicine,characterized by adjustable chemical composition,high porosity,and ***,the combination of silicon with MOFs to create silicon-based MOF nanostructures(SiMOFs)remains ***,we establish a diverse library of SiMOFs with various nanostructures,including flower-like,capsule-like,hexagonal snowflake-like,and necklace-like morphologies via microwave-assisted *** SiMOFs,with their spacious interiors,are ideal for drug *** are used to load drugs and create drug-loaded SiMOFs(e.g.,SiFeO).SiFeO exhibits excellent photothermal effects and high reactive oxygen species(ROS)generation capacity,enabling synergistic treatments involving chemochemodynamic-photothermal *** approach efficiently triggers immunogenic cell death(ICD)and demonstrates excellent antitumor efficacy in *** staining reveals that the synergistic therapy can modulate the tumor microenvironment(TME)by reducing M2-phenotype macrophages,increasing the activation of antigen-presenting cells(APCs),enhancing the infiltration of CD4^(+)and CD8^(+)T cells,elevating Granzyme B production,and decreasing the presence of immunosuppressive regulatory T cells(Tregs).Consequently,drug-loaded SiMOFs-mediated combination therapy effectively reverses the immunosuppressive TME and activates robust antitumor immune responses by inducing ICD in tumor cells,ultimately achieving superior anticancer efficacy.

关键词： silicon-based nanomaterials nanocarriers immunogenic cell death antitumor immune responses

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3D Printing of Tough Hydrogel Scaffolds with Functional Surface Structures for Tissue Regeneration

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Nano-Micro Letters 2025年第2期17卷 18-45页

作者： Ke Yao Gaoying Hong Ximin Yuan Weicheng Kong Pengcheng Xia Yuanrong Li Yuewei Chen Nian Liu Jing he Jue Shi Zihe Hu Yanyan zhou Zhijian Xie Yong he State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China Liangzhu Laboratory Zhejiang UniversityHangzhou 310027People’s Republic of China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province College of Mechanical EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China Stomatology Hospital School of StomatologyZhejiang University School of MedicineHangzhou 310027People’s Republic of China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001People’s Republic of China Institute of Digital Medicine Nanjing First HospitalNanjing Medical UniversityNanjing 210006People’s Republic of China

Hydrogel scaffolds have numerous potential applications in the tissue engineering ***,tough hydrogel scaffolds implanted in vivo are seldom reported because it is difficult to balance biocompatibility and high mechanical *** by Chinese ramen,we propose a universal fabricating method(printing-P,training-T,cross-linking-C,PTC&PCT)for tough hydrogel scaffolds to fill this ***,3D printing fabricates a hydrogel scaffold with desired structures(P).Then,the scaffold could have extraordinarily high mechanical properties and functional surface structure by cycle mechanical training with salting-out assistance(T).Finally,the training results are fixed by photo-cross-linking processing(C).The tough gelatin hydrogel scaffolds exhibit excellent tensile strength of 6.66 MPa(622-fold untreated)and have excellent ***,this scaffold possesses functional surface structures from nanometer to micron to millimeter,which can efficiently induce directional cell ***,this strategy can produce bionic human tissue with mechanical properties of 10 kPa-10 MPa by changing the type of salt,and many hydrogels,such as gelatin and silk,could be improved with PTC or PCT *** experiments show that this scaffold can effectively promote the new generation of muscle fibers,blood vessels,and nerves within 4 weeks,prompting the rapid regeneration of large-volume muscle loss injuries.

关键词： 3D printing Tough hydrogel scaffold Functional surface structure Tissue regeneration Biomaterials

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Kangfuxin solution alleviates esophageal stenosis after endoscopic submucosal dissection:A natural ingredient strategy

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World Journal of Gastroenterology 2025年第1期31卷 110-125页

作者： Xin zhou Dan Ma Yi-Xiang he Jing Jin Hong-Lian Wang Yun-Feng Wang Fan Yang Jian-Qin Liu Jie Chen Zhi Li Department of Spleen and Stomach Diseases the Affiliated Traditional Chinese Medicine HospitalSouthwest Medical UniversityLuzhou 646000Sichuan ProvinceChina The Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Digestive System Diseases of Luzhou City The Affiliated Traditional Medicine HospitalSouthwest Medical UniversityLuzhou 646000Sichuan ProvinceChina Department of Gastroenterology Changhai HospitalNaval Medical UniversityShanghai 20082China Research Center of Integrated Chinese and Western Medicine The Affiliated Traditional Chinese Medicine HospitalSouthwest Medical UniversityLuzhou 646000Sichuan ProvinceChina School of Integrated Traditional Chinese and Western Clinical Medicine North Sichuan Medical CollegeNanchong637100Sichuan ProvinceChina

BACKGROUND Esophageal stricture ranks among the most significant complications following endoscopic submucosal dissection(ESD).Excessive fibrotic repair is a typical pathological feature leading to stenosis after *** To examine the effectiveness and underlying mechanism of Kangfuxin solution(KFX)in mitigating excessive fibrotic repair of the esophagus *** Pigs received KFX at 0.74 mL/kg/d for 21 days after esophageal full circumferential *** examinations occurred on days 7 and 21 *** vitro,recombinant transforming growth factor(TGF)-β1(5 ng/mL)induced a fibrotic microenvironment in primary esophageal fibroblasts(pEsF).After 24 hours of KFX treatment(at 1.5%,1%,and 0.5%),expression ofα-smooth muscle actin-2(ACTA2),fibronectin(FN),and type collagen I was *** signaling was analyzed,including TGF-β1,Smad2/3,and phosphor-smad2/3(p-Smad2/3).RESULTS Compared to the Control group,the groups treated with KFX and prednisolone exhibited reduced esophageal stenosis,lower weight loss rates,and improved food tolerance 21 d after *** treatment,Masson staining revealed thinner and less dense collagen fibers in the submucosal ***,the expression of fibrotic effector molecules was notably ***,KFX downregulated the transduction levels of fibrotic functional molecules such as TGF-β1,Smad2/3,and p-Smad2/*** vitro,pEsF exposed to TGF-β1-induced fibrotic microenvironment displayed increased fibrotic activity,which was reversed by KFX treatment,leading to reduced activation of ACTA2,FN,and collagen *** 1.5%KFX treatment group showed decreased expression of p-Smad 2/3 in TGF-β1-activated *** KFX showed promise as a therapeutic option for post-full circumferential esophageal ESD strictures,potentially by suppressing fibroblast fibrotic activity through modulation of the TGF-β1/Smads signaling pathway.

关键词： Kangfuxin solution Natural component Endoscopic submucosal dissection Esophagus stricture Fibrosis

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Stability for a competing system of hierarchical age-structured populations

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International Journal of Biomathematics 2020年第7期13卷 325-345页

作者： ze-Rong he Nan zhou Institute of Operational Research and Cybernetics Hangzhou Dianzi University Hangzhou 310018P.R.China

In this paper,we are concerned with the stability for a model in the form of system of integro-partial differential equations,which governs the evolution of two competing age-structured *** age-specified environment is incorporated in the vital rates,which displays the hierarchy of *** a non-zero fixed-point result,we show the existence of positive *** conditions for the stability of steady states are derived by means of semigroup ***,numerical experiments are also presented.

关键词： Dominance rank population system equilibria stability semigroup of linear operators

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