A modeling study on lateral compressive behavior of structured needle - punched nonwovens

The aim of this work is to study the compression behavior of cord-structured needled fabrics. In order to achieve the objectives of this research, melt-spun polypropylene fibres of various linear densities have been produced by varying the spinning pump speed. The effect of linear density of melt-spun polypropylene fibres on compressive behavior of the fabrics has been investigated. A Zwick tester set in compressive mode is used to obtain variation of compressive force versus compression thickness. Van Wyk law is adapted to model the lateral compressive behavior of cord-structured needled fabrics. The experimental results are compared with the theoretical curves calculated using Van Wyk law. Results show that the increase in linear density of fibres tends to reduce the compressive force required to compress the samples to a pre-defined thickness. An acceptable conformity between Van Wyk’s equation and compressive behavior of cord-structured needled fabrics is also observed

A Study of the Subject of Public Libraries in Web of Science and Islamic World Science Citation Center

The purpose of this study was to investigate the subject of “public libraries” in the Clarivate Analytics Web of Science (WoS) and Islamic World Science Citation Center (ISC). The present study is a descriptive-analytical research adopting scientometrics approach in terms of data collection. The statistical population of the study consisted of 2976 documents indexed in the WoS during 1900-2017 as well as 232 documents indexed in the ISC during 1999-2017. To collect data, we refined the search to title as (TI=Public Library*) and limited it to the time span (PY=1900-2017) in WoS in order to avoid diversity in the retrieved documents. The same approach was followed to retrieve documents from ISC databases. Research findings showed that foreign researchers were interested in “information science and library”, “computer sciences”, and “architecture” in relation to public library studies. On the other hand, Iranian researchers focused on “public library studies”, “assessment”, and “staff studies including managers and librarians”. Considering the journals publishing research on public library issues, the findings showed that the American Library Journal (n=722) and the Iranian Research on Information Science and public libraries (n=134) published the largest number of articles on the subject at the global and local levels, respectively.  USA, Canada, and England were the most productive countries in “public libraries” research area. Besides, University of Illinois and Islamic Azad University were the most active institutions publishing in this field at international and national levels with 62 and 57 documents, respectively. This study aimed to survey and compare research on public libraries in WoS and ISC. An examination of the subject area of public libraries revealed the trends of research fronts at the global level and in Iran and determines whether or not the topics of interest to world-class researchers are close to that of national researchers or if domestic researchers have addressed public library issues with an indigenous approach.

Estimating the deflection of weft yarn in plain woven fabric using yarn pull out test

A simple and practical model has been proposed to calculate the deflection of weft in a plain woven fabric using yarn pull out test. In this modeling, the weft yarn is considered as an elastic beam, which is fixed supported at ends, and deflected at the middle by the normal load applied by the warp. The case of small deflection is adopted to calculate the maximum deflection of weft yarn and to study the shape and geometry of the bent weft. The normal load is estimated from pullout test. Bending rigidity of the weft yarn is calculated from the relation between the bending rigidities of fabric and thread. Five different weft densities have been studied. The shape of actual weft has been studied by microscopic photography from the lateral section of the fabric, and compared to the theoretical deflection curve of weft based on small deflection modeling. The results show that the actual and theoretical curves are reasonably close to each other. The maximum deflection of the weft yarn increases as the weft density (picks/cm) increases. This may be due to the increase in normal load in higher densities of the weft yarns. The results also show that the deviation of theoretical curve from the actual curve increases with the decrease in weft density

Effect of UV degradation and dynamic loading on durability of acrylic carpets using multiple regression method

26-31The effect of dynamic fatigue loading on the carpet samples subjected to long-time UV radiation exposure has been studied. The carpet samples are first subjected to different UV exposure time and then dynamic loading is imposed to the samples. In each case, the thickness loss of the carpets is measured. The results show that the UV exposure time has a slight effect on the thickness loss of the carpets. The number of dynamic impacts, on the other hand, shows a significant effect on the thickness loss with an exponential correlation. Using best curve fitting method based on least square method, a predicting equation is derived for the multiple effect of UV exposure time and number of dynamic loading on the thickness loss. The experimental verification reveals that the proposed predicting equation can be used with an acceptable accuracy

Integrated Intermodal Network Design with Nonlinear Inter-Hub Movement Costs

In this research, transportation mode and load route selection problems are integrated with the hub location problem in a single mathematical formulation to find the optimal design of intermodal transportation networks. Economies of scale are modeled utilizing a stepwise function that relates the per container transportation cost to the amount of flow between two nodes. A heuristic method combining a genetic algorithm and the shortest path algorithm was developed to solve this integrated planning problem. Computational experiments were completed to evaluate the performance of the proposed heuristic for different problem instances. At the end, conclusions are presented and future research directions are discussed

Effect of UV degradation and dynamic loading on durability of acrylic carpets using multiple regression method

The effect of dynamic fatigue loading on the carpet samples subjected to long-time UV radiation exposure has beenstudied. The carpet samples are first subjected to different UV exposure time and then dynamic loading is imposed to thesamples. In each case, the thickness loss of the carpets is measured. The results show that the UV exposure time has a slighteffect on the thickness loss of the carpets. The number of dynamic impacts, on the other hand, shows a significant effect onthe thickness loss with an exponential correlation. Using best curve fitting method based on least square method,a predicting equation is derived for the multiple effect of UV exposure time and number of dynamic loading on the thicknessloss. The experimental verification reveals that the proposed predicting equation can be used with an acceptable accuracy

Open access policy

Scholarly communication as a social activity needs rethinking since this process is in the monopoly of commercial publishers. Authors and their institutions as well as librarians had been working to achieve unrestricted access to research output. In this regard, many researchers around the world gathered in Budapest on February 2002 to decide on global access to publications free of legal and price barriers. This campaign leads to issuing the declaration Budapest Open Access Initiative. This global and scientific gathering was the starting point for open access movement. This new paradigm in scholarly communication is discussed in this paper from price, legal, and business approaches. In relation to open access policies, “green and gold” routes as well as new licences in terms of Creative Commons are considered. Finally, I concluded that higher education institutes should provide suitable infrastructure to make researchers’ works accessible to others. At the same time, custodians of higher education have to legislate for new policies to mandate their researchers to publish the outputs in institutional and subject-based repositories

The role of government on export performance (an empirical model, case study: carpet industry)

This study empirically investigates the direct and indirect effects of government planning on firm export performance. Government export programs normally define the premise for successful or failure exporting activities of the corporate sector and play a key role in stimulating international business activities of firms (Abay, stanl, slater, 1989) In this article, we explain the government activities for export development and the activities that make barriers for exporting that the promoting factors include: Tax incentive, Covering insurance, Export guarantee fund, Create exhibition, Give information about appropriate market, Export developing program, Training classes about the rules of import& export, and the barrier program include: Exchange rate fluctuations, Tariff barrier, Boycott(sanction), Political obstacle, Export license. so, the motto of this study is to find out the affecting role of government on export performance of company to ensure profitable export performance in the case of carpet company in Iran. Developing of non-oil exports are important because of revenues oil declining and oil resources renewable, on the hand, and increasing of population, on the other hand. Behavior and performance of the company in the exporting markets, also, investigating of the key success factors are one of the important factors in this scope and because of the importance of carpet industry in non-oil export, in this essay, we investigating the  effective factors on export performance in carpet companies. This study in term of purpose is applied research methods and in term of doing research is descriptive – analytical. And we use of questionnaire among 342 people that work in carpet company. And between 13 Hypothesis all of them accepted in this study according to SPSS software and regression, it means that all factors have positive and meaningful relationship with export performance. Keywords: government role, export performance, promotion program, barrier progra