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Conceptual design and development of an automated co-generation system

Co-generation or Combined Heat and Power (CHP) is the simultaneous generation of both electricity and heat from the same fuel for useful purposes. The fuel varies greatly and can include coal, biomass, natural gas, nuclear material, the sun or heat stored in the earth. Co-generation (as a vector of energy efficiency) and renewable sources of energy possess their own set of low carbon benefits. Coupling co-gener...

Finding the optimal setting of the sewing needle transfer mechansm using simula...

The paper is concerned with an analysis and optimisation of the needle transfer mechanism by means of the software Pro/Engineer Wildfire 4 with the aim to obtain a reduction of needle wear. An optimisation of parameters of the setting mechanism that influence the moment of release of the needle during its transfer from one needle bar to the other has been carried out. As a result the optimal setting of the need...

A formal approach for safe controllers analysis

Sensory comfort evaluation of wool fabrics by objective assessment of surface m...

The sensorial comfort is one of the most important aspects of clothing, mainly for next-to-skin garments such as trousers for summer. The perceived comfort of wearers of these garments depends to a great extent on the tactile properties of the fabrics. One of the most important surface characteristics of fabrics is the friction coefficient. Two laboratory equipments were developed to evaluate this parameter, th...

Sonar ultra-sónico para pequenos robots

O presente documento tem como objectivo descrever a implementação de um Sonar ultra-sónico para pequenos robots. O tema desta dissertação surgiu a partir da observação das limitações existentes nos sistemas ultra -sónicos de detecção de obstáculos disponíveis para os sistemas robóticos. Assim, foi decidido construir um array utilizando sensores de baixo custo. Estes transdutores apresentam contudo um diâmetro c...

Fabrics made from non-conventaional blends : what can we expect from them relat...

This paper briefly describes a novel patented laboratory equipment, which was studied, designed, and manufactured at the University of Minho, Portugal, based on a new method of accessing friction coefficient of fabrics and other two-dimensional non-rigid surfaces, as well as its fundamentals and working principle. An experimental study was carried out in order to compare fabrics produced with a new generation o...

Analysis oft the friction coefficient in fabrics made from non-conventional blends

Most textile are used and touched by the human skin, in particular the hand. Tradicionally, the quality and surface characteristics of apparel fabrics are evaluated by touching and feeling, leading to a subjective assessment. for this reason, the interaction with the human senses is an essential performance property. when touched by the human hand, friction is one of the first feeling and therefore friction coe...

Frictorq, fabric friction tester : a comparartive study eith kes

Coeficiente of friction is one of the factors involved in the so-called parameter fabric hand its importance justifies the number of contributions give in the past to this problem. more recently, a new laboratory instrument was proposed by the authors for the assessment of tis property. A comparative study with another widely respected instruments, the Kes-friction, is the main purpose of this research.

Handle of cotton knitted fabrics : influence of pretreatments

Consumers demand for comfort has been permanently rising. In the last twenty years or so a good progress was achieved in this area resulting in more pleasant fabrics handle. It is well know that this complex fabric property depends on fabric constructon, finess of fibers and finishing treatments, although some chemical and most mechanical finishing processes improve it. This paper discusses fabric handle charac...

Um sistema simples para preparação de microesferas de quitosana

This article describes the construction and optimization of an inexpensive apparatus for the production of uniform and porous chitosan microspheres. It also describes the control of the main operational parameters and strategies for the production of uniform chitosan microspheres.