检索结果-南通市图书馆

Enhancing MXene-based supercapacitors:Role of synthesis and 3D architectures

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 Energy Chemistry 2024年第4期91卷 1-26页

作者： Wen Siong Poh Wen Jie Yiang wee-Jun Ong Pau Loke Show Chuan Yi Foo School of Energy and Chemical Engineering Xiamen University MalaysiaSelangor Darul EhsanMalaysia&College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Kelip-kelip!Center of Excellence for Light Enabling Technologies Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia Center of Excellence for NaNo Energy&Catalysis Technology(CONNECT) Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia Department of Chemical Engineering Khalifa UniversityShakhbout Bin Sultan St-Zone 1Abu DhabiUnited Arab Emirates Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection Wenzhou UniversityWenzhou 325035ZhejiangChina Department of Chemical and Environmental Engineering Faculty of Science and EngineeringUniversity of Nottingham MalaysiaJalan Broga43500 SemenyihSelangor Darul EhsanMalaysia Department of Sustainable Engineering Saveetha School of EngineeringSIMATSChennai 602105India

MXene has been the limelight for studies on electrode active materials,aiming at developing supercapacitors with boosted energy density to meet the emerging influx of wearable and portable electronic *** its various desirable properties including intrinsic flexibility,high specific surface area,excellent metallic conductivity and unique abundance of surface functionalities,its full potential for electrochemical performance is hindered by the notorious restacking phenomenon of MXene *** to its two-dimensional(2D)nature and surface functional groups,inevitable van der Waals interactions drive the agglomeration of nanosheets,ultimately reducing the exposure of electrochemically active sites to the electrolyte,as well as severely lengthening electrolyte ion transport *** a result,energy and power density deteriorate,limiting the application versatility of MXene-based *** 3D architectures using 2D nanosheets presents as a straightforward yet ingenious approach to mitigate the fatal flaws of ***,the sheer number of distinct methodologies reported,thus far,calls for a systematic review that unravels the rationale behind such 3D MXene structural ***,this review aims to serve this purpose while also scrutinizing the structure–property relationship to correlate such structural modifications to their ensuing electrochemical performance ***,the physicochemical properties of MXene play fundamental roles in determining the effective charge storage capabilities of 3D MXene-based *** largely depends on different MXene synthesis techniques and synthesis condition variations,hence,elucidated in this review as ***,the challenges and perspectives for achieving viable commercialization of MXene-based supercapacitor electrodes are highlighted.

关键词： MXene 3D architectures Synthesis design Supercapacitor Energy storage

Identifying prognostic factors for conservative treatment outcomes in servicemen with chronic exertional compartment syndrome treated at a rehabilitation center

在线全文

学校读者我要写书评

暂无评论

Military Medical Research 2018年第3期5卷 199-206页

作者： Mariette Z.Meulekamp Peter van der Wurff Alfred van der Meer Cees lucas Research and Development Military Rehabilitation CentreAardenburgDoomthe Netherlands Department of Physiotherapy HU University of Applied SciencesUtrechtthe Netherlands Department of Clinical Epidemiology Biostatistics and BioinformaticsAcademic Medical CentreUniversity of AmsterdamAmsterdamthe Netherlands

Background: Chronic exertional compartment syndrome(CECS) is a condition of pain induced by exercise, and it is characterized by muscle swelling and impaired muscle function in the lower leg. Given the diversity in the diagnosis and treatment of CECS, it is desirable to determine variables pertaining to prognosis and recovery. The purpose of this study is to identify prognostic factors for conservative treatment outcomes in servicemen with CECS who were treated at a Military Rehabilitation ***: Patients from all military services were referred from the special unit for lower leg pain at the Central Military Hospital, Utrecht, the Netherlands. Descriptive analysis was used to report the characteristics of the participants and their baseline measurements. Group differences were analyzed using a Student's t-test or MannWhitney U test, according to the normality of the data distribution. Differences between the pre-and postintervention outcomes were evaluated using the Wilcoxon signed rank test. To evaluate the magnitude of prognostic factors, a univariate logistic regression analysis was performed. The prognostic factors included age, body mass index, body fat percentage, self-efficacy beliefs, foot malalignment, intramuscular pressure, other comorbidities, protein and creatine use, smoking, alcohol use, complaint duration, physical demands, and duration of military ***: After the rehabilitation period, we observed 25 patients with a successful outcome, which was defined as a reduction in pain(≥2 points) during the capacity test measured using a verbal rating scale and 20 patients with an unsuccessful outcome. Factors demonstrating a limited increased odds ratio for an unsuccessful outcome included smoking, alcohol use, intramuscular pressure, a complaint duration of more than 6 months, and physical demands of service. However, these factors did not reach ***: This study did not identify any prognostic factors that predict the

关键词： Lower leg pain Observational study Rehabilitation

Nordhaus-Gaddum Results for the Sum of the Induced Path Number of a Graph and Its Complement

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2012年第12期28卷 2365-2372页

作者： Johannes H.HATTINGH Ossama A.SALEH lucas C.van der MERWE Terry J.WALTERS Department of Mathematics East Carolina University Department of Mathematics University of Johannesburg Department of Mathematics University of Tennessee at Chattanooga

The induced path number p（G） of a graph G is defined as the minimum number of subsets into which the vertex set of G can be partitioned so that each subset induces a path. Broere et hi. proved that if G is a graph of order n, then 〈 p（G）＋ p（G）〈3n/2] . In this paper,_we characterize [3n/2], improve the lower bound on p（G）＋ p（G） by one when the graphs G for which p（G） -4- p（G） = 3n n is the square of an odd integer, and determine a best possible upper bound for p（G）＋ p（G） when neither G nor G has isolated vertices.

关键词： Nordhaus-Gaddum induced path number

Cerebral magnetic resonance imaging in quiescent Crohn's disease patients with fatigue

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第6期23卷 1018-1029页

作者： Sanne van Erp Ece Ercan Perla Breedveld Lianne Brakenhoff Eidrees Ghariq Sophie Schmid Matthias van Osch Mark van Buchem Bart Emmer Jeroen van der Grond Ron Wolterbeek Daniel Hommes Herma Fidder Nic van der wee Tom Huizinga Désirée van der Heijde Huub Middelkoop Itamar Ronen Andrea van der Meulen-de Jong Department of Gastroenterology and Hepatology Leiden University Medical Center C.J.Gorter Center Leiden University Medical Center Department of Radiology Leiden University Medical Center Department of Medical Statistics Leiden University Medical Center Center for Inflammatory Bowel Diseases University of California Los Angeles Department of Gastroenterology and Hepatology University Medical Center Utrecht Department of Psychiatry Leiden University Medical Center Department of Rheumatology Leiden University Medical Center Department of Neuropsychology Leiden University Medical Center Department of Radiology Leiden University Medical CenterLeiden

AIM To evaluate brain involvement in quiescent Crohn's disease (CD) patients with fatigue using quantitative magnetic resonance imaging(MRI).METHODS Multiple MRI techniques were used to assess cerebral changes in 20 quiescent CD patients with fatigue(defined with at least 6 points out of an 11-point numeric rating scale compared with 17 healthy age and gender matched controls without fatigue. Furthermore, mental status was assessed by cognitive functioning, based on the neuropsychological inventory including the different domains global cognitive functioning, memory and executive functioning and in addition mood and quality of life scores. Cognitive functioning and mood status were correlated with MRI findings in the both study *** Reduced glutamate + glutamine (Glx = Glu + Gln) concentrations (P = 0.02) and ratios to total creatine(P = 0.02) were found in CD patients compared with controls. Significant increased Cerebral Blood Flow(P = 0.05) was found in CD patients (53.08 ± 6.14 mL/100 g/min) compared with controls (47.60 ± 8.62 mL/100 g/min). CD patients encountered significantly more depressive symptoms (P ween CD patients and controls in the T1-weighted analysis. In addition, no correlation was found between mental status and MRI *** This work shows evidence for perfusion, neurochemical and mental differences in the brain of CD patients with fatigue compared with healthy controls.

关键词：磁性的回声成像全身的发炎疲劳 Crohns 疾病认知

An implantable,wireless,battery-free system for tactile pressure sensing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2023年第5期9卷 309-320页

作者： Lin Du Han Hao Yixiao Ding Andrew Gabros Thomas C.E.Mier Jan van der Spiegel Timothy H.lucas Firooz Aflatouni Andrew G.Richardson Mark G.Allen Department of Electrical and Systems Engineering School of Engineering and Applied ScienceUniversity of PennsylvaniaPhiladelphiaPAUSA Department of Neurosurgery Perelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA Departments of Neurosurgery and Biomedical Engineering Ohio State UniversityColumbusOHUSA

The sense of touch is critical to dexterous use of the hands and thus an essential component of efforts to restore hand function after amputation or *** systems have addressed this goal with wearable tactile ***,such wearable sensors are suboptimal for neuroprosthetic systems designed to reanimate a patient’s own paralyzed ***,we developed an implantable tactile sensing system intended for subdermal *** system is composed of a microfabricated capacitive pressure sensor,a custom integrated circuit supporting wireless powering and data transmission,and a laser-fused hermetic silica *** miniature device was validated through simulations,benchtop assessment,and testing in a primate *** sensor implanted in the fingertip accurately measured applied skin forces with a resolution of 4.3 *** output from this novel sensor could be encoded in the brain with microstimulation to provide tactile *** broadly,the materials,system design,and fabrication approach establish new foundational capabilities for various applications of implantable sensing systems.

关键词： system battery fused

Atomic-scale characterization of two-dimensional magnets and their heterostructures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

ChemPhysMater 2023年第4期2卷 282-294页

作者： Yuli Huang Mingyue Sun Yihe Wang Andrew Thye Shen wee Wei Chen Joint School of National University of Singapore and Tianjin University International Joint Institute of Tianjin UniversityFuzhou 350207China Department of Physics National University of SingaporeSingapore 117551Singapore Department of Chemistry National University of SingaporeSingapore 117542Singapore

The realization of long-range magnetic ordering in two-dimensional(2D)van der Waals systems significantly expands the scope of the 2D family as well as their possible spin-related phenomena and device *** atomically thin nature of 2D materials makes their magnetically ordered states sensitive to local environments,and this necessitates advanced characterization at the atomic ***,we briefly review several representative 2D magnetic systems,namely,iron chalcogenides,chromium chalcogenides,chromium trihalides,and their *** powerful scanning-probe microscopy,atomically resolved characterization of their crystalline configurations,electronic structures,and magnetization distributions has been achieved,and novel phenomena such as giant tunneling magnetoresistance and topological superconductivity have been ***,we discuss the challenges and new perspectives in this flourishing field.

关键词： Two-dimensional magnets Two-dimensional heterostructures Scanning probe microscopy Spin-polarized configuration

Hand rim wheelchair training: Effects of intensity and duration on physical capacity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Health 2013年第6期5卷 9-16页

作者： Sonja de Groot Jan W. van der Scheer Jordi A. van der Windt Joske Nauta Louise J. C. van der Hijden Linda Luigjes lucas H. V. van der Woude Amsterdam Rehabilitation Research Center/Reade Amsterdam The Netherlands Research Institute MOVE Faculty of Human Movement Sciences VU University Amsterdam The Netherlands University of Groningen University Medical Center Groningen Center for Human Movement Sciences Groningen The Netherlands

The purpose of this study was to compare the effects of intensity and duration of training on physical capacity in a 7 weeks hand rim wheelchair training in able-bodied men. Thirty-six able-bodied men participated in three groups: a 30% heart rate reserve (HRR) 70 min training group (N = 14), a 70% HRR 30 minutes training group (N = 13) and a 30% HRR 30 minutes training group (N = 9). All groups trained 3 times per week for 7 weeks on a treadmill. Pre and post tests on a wheelchair ergometer comprised a submaximal test at 20% and 40% of the estimated peak power output, in which submaximal heart rate, oxygen uptake and mechanical efficiency were determined. In maximal exercise tests, maximal isometric strength, sprint power, peak power output and peak oxygen uptake were measured. No significant differences were found between the training groups on submaximal and maximal parameters. It can be concluded that, in persons new to wheelchair use, seven weeks of wheelchair endurance training at an intensity of 30% HRR for 30 minutes is as effective as a training at a higher intensity (70% HRR) or with a longer duration (70 min).

关键词： Wheelchairs Oxygen Consumption Work Capacity Physical Education and Training

Anomalously enhanced thermal stability of phosphorene via metal adatom doping: An experimental and first-principles study

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 Research 2016年第9期9卷 2687-2695页

作者： Xuewei Feng Vadym V.Kulish Ping Wu xinke Liu Kah-wee Ang Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117583Singapore Entropic Interface Group(EIG) Engineering Product DevelopmentSingapore University of Technology and Design(SUTD)8 Somapah RoadSingapore 487372Singapore College of Materials Science and Engineering Shenzhen Engineering Laboratory for Advanced Technology of CeramicsNanshan District Key Lab for Biopolymer and Safety EvaluationShenzhen University3688 Nanhai AvenueShenzhen 518060China

Atomically thin black phosphorus, also known as phosphorene, is an emerging two-dimensional (2D) material, which has attracted increasing attention due to its unique electronic and optoelectronic properties. However, the reduced thermal stability of phosphorene limits its suitability for high-temperature fabrication processes, which could be detrimental for the performance of phosphorenebased devices. Here, we investigate the impact of doping by Al and Hf transition metal adatoms on the thermal stability of phosphorene. The formation of Al–P covalent bonds was found to significantly improve the thermal coefficients of the Ag1, B2g, and Ag2phonon modes to 0.00044, 0.00081, and 0.00012 cm–1·°C–1, respectively, which are two orders of magnitude lower than those observed for pristine P–P bonds (~0.01 cm–1·°C–1). First-principles calculations within the density functional theory framework reveal that the observed thermal stability enhancement in the Al-doped material reflects a significantly higher Al binding energy, due to the stronger Al–P bonds compared to the weak van der Waals interactions between adjacent P atoms in the undoped material. The present work thus paves the way towards phosphorene materials with improved structural stability, which could be promising candidates for potential nanoelectronic and optoelectronic applications. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

关键词： phosphorene black phosphorus adatom doping transition metals thermal stability

Bi_(2)S_(3) for Aqueous Zn Ion Battery with Enhanced Cycle Stability

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-Micro Letters 2020年第1期12卷 93-101页

作者： Ting Xiong Yinming Wang Bosi Yin Wen Shi wee Siang Vincent Lee Junmin Xue Department of Materials Science and Engineering National University of SingaporeSingapore 117573Singapore Centre for Advanced 2D Materials and Graphene Research Centre National University of SingaporeSingapore 117546Singapore MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyNo.92 West‑Da Zhi StreetHarbin 150001People’s Republic of China

Aqueous Zn ion batteries(ZIBs)are promising in energy storage due to the low cost,high safety,and material *** development of metal oxides as the cathode for ZIBs is limited by the strong electrostatic forces between O2−and Zn2+which leads to poor cyclic ***,Bi2S3 is proposed as a promising cathode material for rechargeable aqueous *** cyclic stability and fast diffusion of Zn2+is ***,the layered structure of Bi2S3 with the weak van der Waals interaction between layers offers paths for diffusion and occupancy of Zn2+.As a result,the Zn/Bi2S3 battery delivers high capacity of 161 mAh g−1 at 0.2 A g−1 and good cycling stability up to 100 cycles with ca.100%*** battery also demonstrates good cyclic performance of ca.80.3%over 2000 cycles at 1 A g−*** storage mechanism in the Bi2S3 cathode is related to the reversible Zn ion intercalation/extraction reactions and the capacitive *** work indicates that Bi2S3 shows great potential as the cathode of ZIBs with good performance and stability.

关键词： Aqueous Zn ion battery Bi_(2)S_(3) Good stability