Search results

This study aims to optimize the parametric combination of injected slub yarn to achieve least abrasive damage on fabrics produced from it.

Single base injected slub yarn structural parameters, vis-à-vis slub length, slub thickness and slub frequency, were varied during preparation of yarn samples under this research work. A total of 17 yarn samples were produced according to the Box and Bhenken design of the experiment. Subsequently knitted and woven (using injected slub yarns in the weft only) fabric samples were prepared from these yarns. Yarn and fabric samples were abraded with standard instruments to see the impact of yarn structural parameters on abrasive damage of fabric in terms of fabric mass loss and appearance deterioration. From the test results, empirical models relating to slub parameters and fabric abrasion behavior were developed through a backward elimination regression approach. Subsequently, a set of optimal parametric combinations was derived with multi-objective evolutionary algorithms by using MATLAB software. This was followed by ranking all optimal solutions through technique for order preference by similarity to idle solution (TOPSIS) score analysis.

The injected slub yarn’s structural parameters have a strong influence on the abrasive damage of knitted and woven fabric. It is seen that the best suitable parametric combination of slub parameters for achieving the least abrasive damage is not the same for knitted and woven fabric.

The spinner can explore this concept to find out the best suitable parametric combination during pattern making of injected slub yarn through MATLAB solution followed by TOPSIS score analysis based on their priority of criteria level to ensure better abrasion behavior of fabric produced.

Optimization of parametric combination of injected slub yarns will help to ensure production of fabric with most resistance to abrasion for specific applications. The studies showed that the optimal solution for woven and knitted fabrics is different. The result indicates that in the case of knitted fabric, comparatively lesser slub thickness is found to be suitable for getting better fabric abrasion resistance, whereas in the case of woven fabric, comparatively higher slub thickness is found suitable for the same.

The factors affecting housing rent and take-up had been largely examined in a cluster. This leaves a dearth of knowledge on the influences of other disparate factors, such as the aesthetics of the building facade. This paper examines the effects of a deteriorated external wall paint on the tenants, rent and take-up of housing located in a high-end housing estate in Akure, Nigeria. The logic is to examine the place of aesthetics among the general factors affecting take-up and rental prices.

Data were collected through census from 133 respondents residing in houses with deteriorated external wall paint. It applied both descriptive and multinomial logistic regression (MLR) to analyse the data.

Findings reveal that close to 60% of the respondents were psychologically affected by the visible deterioration of external wall paint. This translated to a significance reduction in rent compared with the rental prices of similar houses the appearance of which was not deteriorated. Generally, this study found that aesthetics paled into insignificance in the analysis of the general factors affecting housing take-up and rent. However, it ranked first when these were analysed on the structural characteristics of the house only. This is consistent with findings from the MLR parameter estimate, which shows that those who were psychologically affected are more likely to pay a 15% increase in their current rent to take up a similar house without paint deterioration.

The findings of this study have implications on practice and theory. First, while the location mantra is a key determinant of rental prices in theory, in practice, rent on comparable houses could differ if the aesthetics of the external wall paint is compromised. This implies an avoidable loss of rent to the owner of a property who compromises the aesthetic quality of the external wall paint in a high-end location where affordability is arguably high. The implication on public authority is that a lower rent may have a negative implication on government revenue and specifically property tax which is normally based on market rent of a property.

A novel quality of the study is that it separates the structural characteristics of a house from the general factors in order to examine the specific effect of deteriorated aesthetics of external wall paint on take-up and rent.

The total life and reliability of a fastened joint does not depend entirely upon the initial strength of the components involved but also upon the compatibility of the materials concerned with the service environment.

Modern industrial instruments often have to be placed in surroundings which can easily corrode both outer and inner parts, resulting in, firstly, deterioration in appearance and, secondly, breakdown of accuracy of measurement. In its early stages corrosion can obstruct the movement of inner working parts. In electronic instruments, for example, the contacts between, say, the socket of a valve and the wired or printed circuit might suffer. In this article questions of instrument design and panel design are discussed, the importance of correct installation and maintenance is emphasised and some examples of avoidable corrosion given.

Reviews the problems created by the presence of moisture in buildings, including thermal performance, humidity, structural performance, and visual appearance. Examines the fundamental concepts of moisture ingress and transfer, and the factors that control them. Concludes that it is now possible to compare absorption of various materials with a simple test, and that faster computer processing is now capable of modelling building behaviour under various environmental and material factors.

The paper aims to address concerns that valuers' choice of depreciation models in their cost approach to value is not sustainable (is incapable of preserving patronage in present and future generations).

The paper draws up conceptual expectations regarding how seven UK and US depreciation models pass or fail four identified sustainability indicators: reliability, consistency, usability and separate treatment of depreciation components. Valuation surveyors in Nigeria were offered as a case study of how valuers in one country respond to such conceptual investigations.

The study found that cross‐sectional models, the breakdown model and hedonic modeling are the depreciation models perceived as most sustainable. However, popular model use follows easiest models rather than most sustainable models.

The paper suggests that the pursuit of sustainability in valuation modeling should involve provision of institutionalized best practice guidance beyond that currently provided so as to assist valuers/appraisers in more sustainable choices.

The paper is probably the first to address both UK and US depreciation models and to assess each using defined sustainability criteria.

Because it is cheap, plentiful, strong, and reasonably easy to work, sheet steel continues to be the favourite material for the production of basic structures—usually integral body‐chassis fabrications—in the motor industry. Moreover, because conventional rust‐inhibition, paint‐preparation and paint‐coating systems and materials are now cheap and reliable, once the relatively costly equipment is installed, these are still the accepted processes for protection against corrosion, as well as for enhancing the appearance of the product.

Stress damages us and our performance. It is a real part of most manager's experience and can be said to occur when significant demands exceed perceived management responsibilities and routines. Stress can be the essence of working life, and certainly need not always be damaging to us. But when it becomes excessive, it is something unwanted.

This paper discusses some basic ideas about process development and control in Part I and applies them to soldering in Part II. Because it is possible to understand how design, materials and process affect the product, it is unnecessary and inappropriate to resort to the statistical‐correlation methods that are applied to complex processes. A process qualifies for the label ‘closed loop’ only if the design and materials going into.it are controlled. The types, degree and sophistication of control needed for a process are to be judged by consistency of the product. For soldered assemblies, the product is evaluated by visual inspection, and the adequacy of process development and control depends on the adequacy of inspection. Inspection can be improved if it is regarded as a process. It can also be improved if inspectors understand which features are important and which can be ignored safely, i.e., by understanding their causes and associated risks. Much of the criticism of visual inspection, and perception of need for automated inspection, derive from a failure to distinguish clearly enough between material and process variables, between the two types of inspection (product‐oriented and materials/process‐oriented) and between appearance and risk. Properly controlled visual inspection is well suited for evaluating the soldering process. The most important visual attribute to look for in solder inspection is the contour of the fillet, because this is what reveals the quality of wetting, and wetting is the most important physical attribute of the connection in determining its strength and reliability. Wetting depends on just two basic requirements, heat transfer and solderability, and these are discussed in some detail. Causes of non‐ideal texture and lustre of the solder are given, but these attributes do not affect reliability, nor is measuring solder purity important. Additional factors which do affect reliability relate more to design and materials than to process. Failure to deal with these factors can result in solder defects that are undetectable by any inspection technique. The answer to this problem is therefore not automated inspection to find more kinds of defects than visual inspection can, but control of design and materials, as well as process, to prevent them entirely.

The purpose of this paper is to investigate “image management” as an important element within the concept to the Crime prevention through environmental design (CPTED). Globally, guidance tends to focus on promoting surveillance and few studies have explored how vacant poorly maintained housing might affect perceptions of crime and CPTED.

This paper contrasts the perceptions of 168 members of the public and 12 built environment professionals with regards to a detached property in Perth, Western Australia. Using two photographs to elicit responses (one poorly maintained and one well-maintained) respondents were asked about their perceptions of crime, and the extent to which CPTED features were perceived to be present. These results are contrasted with a site audit of the CPTED qualities visible in both images.

The CPTED audit recorded significantly higher scores for the well-maintained property than for the poorly maintained dwelling. Most respondents indicated they felt less safe, perceived more crime and lower levels of CPTED in relation to the poorly maintained house. The findings provide support that there is a link between poorly maintained housing and the perceptions of CPTED, crime and the fear of crime.

This innovative study utilised two photographic images of the same property to probe “image management”, perceptions of crime and CPTED qualities. It highlights the need to consider these issues throughout the different stages of the development process and presents idea of the “cradle to the grave” life-cycle of criminal opportunities.