Governing Equations for Web Tension and Web Velocity in the Presence of Nonideal Rollers

2012 ◽  
Vol 135 (1) ◽  
Author(s):  
Carlo Branca ◽  
Prabhakar R. Pagilla ◽  
Karl N. Reid
Keyword(s):  
Exit Point ◽  
Entry And Exit ◽  
Governing Equations ◽  
Periodic Oscillations ◽  
Transport Velocity ◽  
Almost All ◽  
Tension Regulation ◽  
Web Platform ◽  
The Web ◽  
Web Tension

Since rotating machinery is used to transport flexible materials (commonly known as webs) on rollers, it is common to observe periodic oscillations in measured signals such as web tension and web transport velocity. These periodic oscillations are more prevalent in the presence of nonideal elements such as eccentric rollers and out-of-round material rolls. One of the critical needs in efficient transport of webs is to maintain web tension at a prescribed value. Tension regulation affects almost all key processes involved during web transport including printing, registration, lamination, winding, etc. Governing equations for web tension and transport velocity that can accurately predict measured behavior in the presence of nonideal rollers are beneficial in understanding web transport behavior under various dynamic conditions and the design of suitable web tension and speed control systems. The focus of this paper is on modeling the effect of eccentric rollers and out-of-round material rolls on web tension and web transport velocity. The new governing equations for web velocity on an eccentric roller and web tension in spans adjacent to the eccentric roller are presented and discussed; a web span is the free web between two consecutive rollers. To solve these governing equations, the location of the entry and exit point of the web on the eccentric roller as it rotates and the length of the web spans adjacent to the eccentric roller are required; a procedure for obtaining this information is described. To corroborate the models and the developed approach, data from experiments on a large experimental web platform are compared with data from model simulations, and a representative sample of the results are presented and discussed.

System for Automatic Web Guiding for Roll-to-Roll Machine Working in a Start-Stop Mode

2014 ◽  
Vol 223 ◽  
pp. 374-382
Author(s):  
Mirosław Neska ◽  
Andrzej Majcher
Keyword(s):  
Material Processing ◽  
Control System ◽  
Processing Machine ◽  
Processing Machinery ◽  
Roll To Roll ◽  
Transport Velocity ◽  
The Web ◽  
Selection Of ◽  
Web Tension ◽  
Hardware Structure

Web guiding used in roll-to-roll material processing machinery is connected with a number of issues including the maintenance of the web tension, the precision of the lateral web displacement, the accuracy of transport positioning of the web, and the selection of web transport velocity. The article presents the precision of the lateral web displacement issue during the start-stop work mode of the web transport. A model of a system for automatic web guiding is shown. The requirements of the lateral web guiding for transporting material over rollers in a processing machine working in a start-stop mode are presented. The control system is discussed, particularly its hardware structure and behaviour. The obtained functionality of the control system enables its application in roll-to-roll material processing machines, working either in the start-stop mode or continuously.

Intensified telematic treatment for obesity using the web platform PREDIRCAM2, descriptive basal characteristics and preliminary results

2017 ◽  
Author(s):  
Valeria Alcantara-Aragon ◽  
Susana Rodrigo-Cano ◽  
Maria Jose Martinez ◽  
Carmen Martinez ◽  
Jose Tapia ◽  
...  
Keyword(s):  
Preliminary Results ◽  
Web Platform ◽  
The Web

Potential of existing online 24-hour dietary recall tools for national dietary surveys

2021 ◽  
pp. 1-62
Author(s):  
Rozenn Gazan ◽  
Florent Vieux ◽  
Ségolène Mora ◽  
Sabrina Havard ◽  
Carine Dubuisson
Keyword(s):  
Grey Literature ◽  
Quality Data ◽  
High Quality Data ◽  
Require Time ◽  
Dietary Recall ◽  
Dietary Surveys ◽  
Almost All ◽  
The Cost ◽  
Web Platform ◽  
Country Specific

Abstract Objective: To describe existing online 24-hour dietary recall (24hDR) tools in terms of functionalities and ability to tackle challenges encountered during national dietary surveys, such as maximizing response rates and collecting high-quality data from a representative sample of the population, while minimizing the cost and response burden. Design: A search (from 2000 to 2019) was conducted in peer-reviewed and grey literature. For each tool, information on functionalities, validation and user usability studies, and potential adaptability for integration into a new context was collected. Setting: Not country-specific Participants: General population Results: Eighteen online 24hDR tools were identified. Most were developed in Europe, for children ≥10 years old and/or for adults. Eight followed the five multiple-pass steps, but used various methodologies and features. Almost all tools (except three) validated their nutrient intake estimates, but with high heterogeneity in methodologies. User usability was not always assessed, and rarely by applying real-time methods. For researchers, eight tools developed a web platform to manage the survey and five appeared to be easily adaptable to a new context. Conclusions: Among the eighteen online 24hDR tools identified, the best candidates to be used in national dietary surveys should be those that were validated for their intake estimates, had confirmed user and researcher usability, and seemed sufficiently flexible to be adapted to new contexts. Regardless of the tool, adaptation to another context will still require time and funding, and this is probably the most challenging step.

scholarly journals Assessment of riparian environments through semi-automated procedures for the computation of eco-morphological indicators: Preliminary results of the WEQUAL project

2019 ◽  
Vol 70 (3) ◽  
pp. 131-145 ◽  
Author(s):  
Raimondo Gallo ◽  
Gianluca Ristorto ◽  
Alex Bojeri ◽  
Nadia Zorzi ◽  
Gabriele Daglio ◽  
...  
Keyword(s):  
Data Collection ◽  
Unmanned Aircraft ◽  
Environmental Data ◽  
Shared Environment ◽  
Surface Model ◽  
Riparian Areas ◽  
Raw Data ◽  
Ecological Criteria ◽  
Web Platform ◽  
The Web

Summary The aim of WEQUAL project (WEb service centre for QUALity multidimensional design and tele-operated monitoring of Green Infrastructures) is the development of a system that is able to support a quick environmental monitoring of riparian areas subjected to the realization of new green infrastructures (GI). The Wequal’s idea is to organize a service center able to manage both the Web Platform and the whole data collection and analysis processes. Through a personal account, the final user (designer, technician, researcher) can get access to the service and requires the evaluation of alternatives GI projects. On the Web Platform, a set of algorithms runs in order to calculate, through automatic procedures, all the ecological criteria required to evaluate a quality environmental index that describes the eco-morphological value of the monitored riparian areas. For this aim, the WEQUI index was developed, which uses 15 indicators that are easy to monitor. In this paper, the approach for environmental data collection and the procedures to perform the automatic assessment of two of the ecological criteria are described. For the computation, the implemented algorithms use data including the vegetation indexes, Digital Terrain Model (DTM), Digital Surface Model (DSM) and a 3D point cloud classification. All the raw data are collected by UAVs (Unmanned Aircraft Vehicle) equipped with a 3D Lidar, multispectral camera and RGB camera. Interpreting all the raw data collected by these sensors, using a multi-attribute approach, the WEQUI index is assessed. The computed ecological index is then used to assess the riparian environmental quality at ex-ante and ex-post river stabilization works. This index, integrated with additional not-technical or not-ecological indicators such as investment required, maintenance costs or social acceptance, can be used in multicriteria analyses in order to evaluate the intervention from a wider point of view. The platform is expected to be attractive for GI designers and policy makers by providing a shared environment, which is able to integrate the method of detection and evaluation of complex indexes and a multidimensional evaluation supported by an expert guide.

How Technologies Can Localize Learners in Multicultural Space

2013 ◽  
pp. 103-127 ◽  
Author(s):  
Gilbert Ahamer
Keyword(s):  
Peer Review ◽  
Team Teaching ◽  
Development Cooperation ◽  
Technological Innovations ◽  
Global Studies ◽  
Global Learning ◽  
Umbrella Organisation ◽  
Innovative Curriculum ◽  
Web Platform ◽  
The Web

Technological innovations can be used in many ways to enhance the suitability of global learning. A newly developed online-supported curriculum “Global Studies” takes account of the necessities of interdisciplinary, intercultural and interparadigmatic learning. The history and genesis of such an innovative curriculum is embedded in a national umbrella organisation focusing on development studies. As the interdisciplinary core, a new lecture on the fundamentals of Global Studies has been implemented in 2010/11 that envisions team teaching and interdisciplinary perspectives. The web platform allows students to present their professional views and discuss them in a peer review. Dialogue and discourse are enhanced by repeated change of roles which is enriched by the broad international and intercultural backgrounds of the participating students. Cultures of understanding are generated and widened as a prerequisite for future careers in development cooperation, diplomacy and transnational organisations.

The World Has Been Naked

2021 ◽  
pp. 306-319
Author(s):  
Ismail Noori Msser
Keyword(s):  
Decision Maker ◽  
Human History ◽  
World Today ◽  
The World ◽  
The Status ◽  
Historical Times ◽  
The Moment ◽  
Web Platform ◽  
The Web

After the WikiLeaks incident, the world today is under the shock of the document. Since the moment of the invention of writing and the entry of man in historical times, the document has remained in the context of the closeness of holiness. Yes, human history is witnessing the leaking of more documents of the utmost importance, but the disclosure of this speed and free and direct and defamation only besieged the documents and stamps them with the symbolism missing, after the overthrow of the status of dear and beloved, and disperses prestige on the web platform. It is a departure from the meaning for which the document was historically designed. What was private became commonplace in a confusing way, and it was a secret exposed, and what was stored for 30 years or more, according to the value of the document and its effects, was public before reaching the decision-maker.

OPTIMAL DESIGN OF HOUSING ATTICS WITH INTEGRATED SOLAR COLLECTORS

2017 ◽  
Vol 12 (4) ◽  
pp. 1-20
Author(s):  
Rodrigo García Alvarado ◽  
Pedro G. Campos ◽  
Paulina Wegertseder
Keyword(s):  
Energy Consumption ◽  
Optimal Design ◽  
Software Tool ◽  
Parametric Modeling ◽  
Solar Collectors ◽  
Single Family ◽  
Design Assessment ◽  
Living Space ◽  
Web Platform ◽  
The Web

In order to reduce the increasing energy consumption for the domestic demands of existing single-family housing and take advantage of frequent building enlargements, this paper presents a methodology and supporting software tool for determining the optimal design configuration of an attic with integrated solar collectors. The analysis procedure is based on parametric modeling, energy simulation and the use of evolutionary algorithms for finding optimal designs. It has been implemented as a Web-platform for public use that provides users with a proposal of an attic shape with maximum solar energy collection, maximum living space and minimum construction envelope for each house according its size and orientation. The attic integrates PV, thermal and hybrid solar panels on one side of the roof. This paper describes the methodology and software design, assessment of the Web-platform usage and case-studies to verify its behavior. In a matter of minutes, the Web-platform enables users to select a specific attic design for each house that has integrated solar collectors that can produce energy to cover almost 100% of domestic energy consumption. The attics designed provide a nearly 30% increase in living space through the extension of one to four rooms, and the construction cost of the envelope is similar to that of a standard housing extension.

Modeling of Web Slip on a Roller and Its Effect on Web Tension Dynamics

2005 ◽  
Author(s):  
Ramamurthy V. Dwivedula ◽  
Prabhakar R. Pagilla
Keyword(s):  
Numerical Computation ◽  
Dynamic Models ◽  
Simple Approach ◽  
Roller Surface ◽  
Perfect Adhesion ◽  
The Web ◽  
Web Tension

This paper considers the effect of web slip over the rollers on the span tension dynamics. In classical development of the web span tension dynamics, it is assumed that there is strict adhesion between the web and the surface of the roller and thus, there is no slip-page between the web and the roller. As a result of this assumption, effect of tension disturbances in downstream spans on the upstream span tension is precluded. However, in practice, perfect adhesion between the web and roller surface is seldom achieved and tension disturbances propagate upstream also. Though web span tension dynamic models that include slippage between web and roller are proposed, these models rely to a great extent on numerical computation of slip arc angles and are prohibitively complex to be of practical use. This paper proposes an alternative, simple approach for developing web span tension dynamics to include the effect of web slip.

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