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PE/CaCO_3-nanocomposites synthesized by in-situ polymerization

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第7期8卷 987-990页

作者： SCHARLACH Katrin KAMINSKY walter Department of Chemistry University of Hamburg Bundesstr. 45 Hamburg 20146 Germany

Polyethylene-nanocomposites with CaCO3-weight fractions from 0 to 15 wt.% were prepared by in-situ polymeriza- tion with Me2Si(Ind)2ZrCl2/MAO metallocene catalysts. A high activity especially in the presence of TIBA was observed. The morphology was investigated by using raster electron microscopy (REM) showing that the CaCO3-nanoparticles are uniformly distributed. The melting temperatures and the crystallization temperatures are not much influenced by increasing filler content.

关键词：聚乙烯金属茂合物催化剂电介质

Formal Reduction of Interfaces to Large-scale Process Control Systems

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International Journal of Automation and computing 2007年第4期4卷 413-421页

作者： walter Hussak Department of Computer Science Loughborough UniversityLoughborough LE11 3TUUK

A formal methodology is proposed to reduce the amount of information displayed to remote human operators at interfaces to large-scale process control plants of a certain type. The reduction proceeds in two stages. In the first stage, minimal reduced subsets of components, which give full information about the state of the whole system, are generated by determining functional dependencies between components. This is achieved by using a temporal logic proof obligation to check whether the state of all components can be inferred from the state of components in a subset in specified situations that the human operator needs to detect, with respect to a finite state machine model of the system and other human operator behavior. Generation of reduced subsets is automated with the help of a temporal logic model checker. The second stage determines the interconnections between components to be displayed in the reduced system so that the natural overall graphical structure of the system is maintained. A formal definition of an aesthetic for the required subgraph of a graph representation of the full system, containing the reduced subset of components, is given for this purpose. The methodology is demonstrated by a case study.

关键词： Finite state machines process control temporal logic user interfaces user modeling.

Early Cardiac Catheterizations within 30 Days Post Congenital Heart Surgery in Children

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Congenital Heart Disease 2023年第1期18卷 79-95页

作者： Daniel Quandt Alessia Callegari Oliver Niesse Martin Christmann Anke Meinhold Hitendu Dave walter Knirsch Oliver Kretschmar Pediatric Heart Centre-Division of Pediatric Cardiology University Children’s Hospital ZurichZurichSwitzerland Department Neonatology and Pediatric Intensive Care University Children’s Hospital ZurichZurichSwitzerland Department of Congenital Cardiothoracic Surgery University Children’s Hospital ZurichZurichSwitzerland Children’s Research Centre ZurichSwitzerlandUniversity Children’s Hospital ZurichZurichSwitzerland University of Zurich ZurichSwitzerland

Background:This study set out to assess the indications,feasibility,safety,and outcome of early cardiac catheterizations(CC)within 30 days after congenital heart surgery(CHS)in *** and Results:This is a retrospective,single-center case review study of all CC within 30 days after CHS between 1/2010-12/2020.A total of 317(138 diagnostic,179 interventional)CC were performed in 245 patients at a median of 4 days(IQR 13)after *** median age was 3 months(IQR 6),and body weight was 5 kg(IQR 4).A total of 194(61.2%)CC were performed in patients with univentricular *** revealed significant pathologies leading to early redo-surgery in 37 patients(12%).The transcatheter interventions primarily were needed in patients after cavo-pulmonary connection(n=69%,21.8%),right ventricle to pulmonary artery conduit(n=39%,12.3%),and Norwood-I surgery(n=34%,10.7%)presenting with hypoxemia,prolonged postoperative course,and suspected arterial stenosis on *** clinical impact of an early postoperative transcatheter intervention for the following clinical course was high in most *** were nine(2.8%)major and 20(6.3%)minor intra-procedural *** factor analysis revealed no difference for the occurrence of complications for patients’age,weight,and time from initial CHS,underlying *** heart disease,or ***:Early CC within 30 days after CHS in children can be performed safely with a high diagnostic and therapeutic *** rate of complications is low,while the therapeutic consequence is relevant.

关键词： Early postoperative cardiac catheterization congenital heart surgery children

INPHOVIS:Interactive visual analytics for smartphone-based digital phenotyping

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Visual Informatics 2023年第2期7卷 13-29页

作者： Hamid Mansoor walter Gerych Abdulaziz Alajaji Luke Buquicchio Kavin Chandrasekaran Emmanuel Agu Elke Rundensteiner Angela Incollingo Rodriguez Worcester Polytechnic Institute USA

Digital phenotyping is the characterization of human behavior patterns based on data from digital devices such as smartphones in order to gain insights into the users’state and especially to identify *** support supervised machine learning,digital phenotyping requires gathering data from study participants’smartphones as they live their ***,participants are then asked to provide ground truth labels about their health *** such complex data is challenging due to limited contextual information and imperfect health/wellness *** propose INteractive PHOne-o-typing VISualization(INPHOVIS),an interactive visual framework for exploratory analysis of smartphone health data to study *** visualization work has focused on mobile health data with clear semantics such as steps or heart rate data collected using dedicated health devices and wearables such as ***,unlike smartphones which are owned by over 85 percent of the US population,wearable devices are less prevalent thus reducing the number of people from whom such data can be *** contrast,the‘‘low-level"sensor data(e.g.,accelerometer or GPS data)supported by INPHOVIS can be easily collected using *** visualizations are designed to provide the essential contextualization of such data and thus help analysts discover complex relationships between observed sensor values and health-predictive *** guide the design of INPHOVIS,we performed a hierarchical task analysis of phone-o-typing requirements with health domain *** then designed and implemented multiple innovative visualizations integral to INPHOVIS including stacked bar charts to show diurnal behavioral patterns,calendar views to visualize day-level data along with bar charts,and correlation views to visualize important wellness predictive *** demonstrate the usefulness of INPHOVIS with walk-throughs of use *** also evaluated INPHOVIS with expert feedb

关键词： Interactive visual analytics Smartphone-sensed data Digital phenotyping

Mobile GIS occupancy audit of Ulana informal settlement in Ekurhuleni municipality, South Africa

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Geo-Spatial Information Science 2018年第4期21卷 322-330页

作者： Baleseng Tlholohelo Mokoena walter Musakwa Department of Town and Regional Planning University of JohannesburgDoornfonteinSouth Africa

Relocating people in informal settlements and upgrading the lives of those people requireconsistent commitment, good strategies, and supporting systems. In South Africa, in order toallocate subsidized housing to beneficiaries of an informal settlement, beneficiary administration needs to determine the number of people who qualify for subsidized houses. Withoutgeo-spatial data-based technical verification, conventional methods of occupancy audits areoften cumbersome, are unreliable, and do not promote smart and evidence-based decisionmaking. Accordingly, the aim of this study is to propose and develop an Oracle-based mobileGIS tool to conduct an occupancy audit for Ulana, an informal settlement in EkurhuleniMunicipality in South Africa. Android-based tablets were used to collect the geographicand socio-economic attributes of the informal dwelling units (DU). Spatial analysis (inArcGIS software and geo-spatial modeling environment) and statistical analysis were conducted to produce the occupancy audit. The results indicated that the use of mobile GISprovides up-to-date, accurate, comprehensive, and real-time data so as to facilitate thedevelopment of smart and integrated human settlements. The results of this audit alsoindicated that only 57% of the households residing in Ulana could potentially benefit fromreceiving a subsidized house. Accordingly, the occupancy audit enables planners to planappropriate upgrading and housing development strategies for informal settlement. Thisstudy demonstrates that successful planning of housing delivery for post independentintegrated neighborhoods is not a mere political rhetoric but is viable when it is based onreasonable geo-spatial techniques and information. The use of mobile GIS therefore needs tobe extended to other informal settlement upgrading projects in South Africa as well as othercities in the global south. However, proper professional training is required to ensure thesuccessful usage of smart mobile GIS tools.

关键词： Mobile GIS geo-spatial occupancy audit informal settlements integration smart cities

A Unisonant r-Matrix Structure of Integrable Systems and Its Reductions

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Chinese Physics Letters 2000年第4期17卷 235-237页

作者：乔志军 walter STRAMPP Institute of Mathematics Fudan UniversityShanghai 200433 Fachbereich 17 Mathematikj Universitat-GH KasselD-34109 KasselGermany

A new method is presented to generate finite dimensional integrable *** starting point is a generalized Lax matrix instead of usual Lax *** a unisonant r-matrix structure and a set of generalized Hamiltonian functions are *** can be clearly seen that various constrained integrable Hows by nonlinearization method,such as the c-AKNS,c-MKdV,c~Toda,etc.,are derived from the reduction of this ***,some new integrable Hows are produced.

关键词： structure integrable matrix

Why are muscles strong, and why do they require little energy in eccentric action?

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Journal of Sport and Health Science 2018年第3期7卷 255-264页

作者： walter Herzog Human Performance Laboratory Faculty of Kinesiology University of Calgary

It is well acknowledged that muscles that are elongated while activated(i.e.,eccentric muscle action)are stronger and require less energy(per unit of force)than muscles that are shortening(i.e.,concentric contraction)or that remain at a constant length(i.e.,isometric contraction).Although the cross-bridge theory of muscle contraction provides a good explanation for the increase in force in active muscle lengthening,it does not explain the residual increase in force following active lengthening(residual force enhancement),or except with additional assumptions,the reduced metabolic requirement of muscle during and following active *** from the cross-bridge theory,2 other primary explanations for the mechanical properties of actively stretched muscles have emerged:(1)the so-called sarcomere length nonuniformity theory and(2)the engagement of a passive structural element *** this article,these theories are discussed,and it is shown that the last of these—the engagement of a passive structural element in eccentric muscle action—offers a simple and complete explanation for many hitherto unexplained observations in actively lengthening *** by no means fully proven,the theory has great appeal for its simplicity and beauty,and even if over time it is shown to be wrong,it nevertheless forms a useful framework for direct hypothesis testing.

关键词： Cross-bridge theory Eccentric Force-length relationship Residual force enhancement Titin

Improved State-Based Peridynamic Lattice Model Including Elasticity, Plasticity and Damage

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Computer Modeling in Engineering & Sciences 2018年第9期116卷 323-347页

作者： Siavash Nikravesh walter Gerstle Department of Civil Construction and Environmental EngineeringUniversity of New MexicoAlbuquerqueNMUSA

In this study,a recently developed peridynamic lattice model called the“Statebased Peridynamic Lattice Model”(SPLM)is improved and *** the SPLM,rather than as a continuum,solids are simulated using a close-packed lattice of peridynamically interacting *** new SPLM approach advances the SPLM model by improving the damage and plasticity ***,plasticity and damage are coupled in this approach.A robust method for damage initiation is developed.A new damage model called the“two-spring damage model”allows damage to localize to a single lattice particle,thus allowing highly localized damage(cracks)to emerge in a realistic manner.A plasticity model that includes hardening,softening,and damage due to plasticity is proposed and *** boundary effects are modeled efficiently and *** improved SPLM method is then employed to simulate three common concrete laboratory tests:uniaxial tension,uniaxial compression,and the Brazilian split cylinder *** SPLM results are then compared with results from the earlier SPLM model,with simplified classical predictions,and with laboratory *** solving the same benchmark problems using various lattice rotations and lattice spacings,the approach is demonstrated to be sufficiently objective to be a useful engineering tool to predict the essentially random behavior of concrete laboratory *** improved SPLM demonstrates significant improvements over the previously published version and is found to simulate concrete structures accurately and efficiently using far less computational effort than comparable computational simulation methods.

关键词： Peridynamics SPLM lattice damage plasticity fracture concrete

Clinical features and epidemiology of spondyloarthritides associated with inflammatory bowel disease

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World Journal of Gastroenterology 2009年第20期15卷 2449-2455页

作者： Carlo Salvarani walter Fries Rheumatology Unit Department of Interna Medicine Department of Internal Medicine and MedicaTherapy University of Messina

Inflammation of axial and/or peripheral joints is one of the most frequent extra-intestinal manifestations complicating the clinical course and therapeutic approach in inflammatory bowel diseases(IBD).The frequency of these complications seems to be similar for both diseases, Crohn's disease and ulcerative *** associated with IBD belongs to the category of *** involvement ranges from isolated inflammatory back pain to ankylosing spondylitis, whereas peripheral arthritis is noted in pauciarticular and in polyarticular *** radiological involvement of the sacroiliac joints is reported to occur in up to 50% of *** musculoskeletal manifestations such as buttock pain, dactylitis, calcaneal enthesitis, and thoracic pain are frequently underdiagnosed and, consequently, are not treated *** diagnostic approaches and criteria have been proposed over the past 40 years in an attempt to correctly classify and diagnose such *** correct recognition of spondylarthropathies needs an integrated multidisciplinary approach in order to identify common therapeutic strategies, especially in the era of the new biologic therapies.

关键词：溃疡性结肠炎临床特点炎症流行病学鸡传染性法氏囊病诊断方法关节炎生物疗法