Search results

This article has been withdrawn as it was published elsewhere and accidentally duplicated. The original article can be seen here: 10.1108/00022660710743840. When citing the article, please cite: J.L. Lin, C.Y. Wei, C.Y. Lin, (2007), “Aerodynamic performance of thin wings at low Reynolds numbers”, Aircraft Engineering and Aerospace Technology, Vol. 79 Iss 3 pp. 245 - 253.

Correctly choosing the nonlinearly chirped fiber Bragg grating (NLCFBG) parameter is very important, which may instruct the effective manufacture grating. The purpose of this paper is to analyze some kinds of curve reflection spectrums and time delays of the FBG.

In this paper, some kinds of curve reflection spectrums and time delays of the FBG are analyzed. The paper makes the numerical simulation of the spectrum character and time delay about some kinds of FBG. The relation between the modulation intensity and linear chirp coefficient c₁ of the FBG is studied for the first time. The transformation of the curve about time delay is compared at different modulation intensity.

The authors investigate the number of dots which is used to draw a graph of the spectrum character and time delay, and is found that the graph of the spectrum character and time delay is broken off when the graphed number of dots is too less. Also, the authors study the reflection spectrum of the NLCFBG, when the segment number M of NLCFBG is less, the graph of reflection spectrum of the NLCFBG is fuzz.

Attention should be paid to coordination among the parameters of the NLCFBG.

The paper provides very useful advice for highly efficient production of the gratings.

The following new viewpoint is proposed: the longer the length of the NLCFBG, the smaller its numerical value of the NLCFBG parameters c₁, c₂ and modulation intensity. This paper is aimed at guiding the correct production of the gratings.

The purpose of this paper is to determine: how the thermal cycling aging affects the ratcheting behavior of anisotropic conductive adhesive film (ACF); how the loading conditions and loading history affect the ratcheting strain and strain rate of ACF with different thermal cycling aging histories.

The ACF of CP6920F was cured at 190°C in an electro-thermal vacuum drying apparatus for 30 s. The cured specimens were put into the thermal cycling chamber (−40-150°C) for aging to 25, 50, 100, 200 and 500 cycles. A series of uniaxial ratcheting tests of aged ACF after different thermal cycles was carried out under stress control at 80°C.

The ACF subjected to larger number of thermal aging cycles exhibits less ratcheting strain under the same loading conditions. The ACF with the same thermal cycling aging history shows more ratcheting strain and a higher ratcheting strain rate when loaded under a larger mean stress or stress amplitude or a lower loading rate. The ratcheting behavior of aged ACF is found to be more sensitive to the lower loading rate. The higher mean stress (or stress amplitude) enhances the deformation resistance and consequently restrains the ratcheting strain of subsequent cycling with a lower mean stress (or stress amplitude). The prior lower loading rate accelerates the plastic deformation more significantly than the higher one.

The influencing trends of thermal cycling aging, loading condition and loading history on ratcheting behavior of ACF are obtained, which is important for the design and safety assessment of ACF joints.

The concept of centralized systems is written in the language of set theory in order to take advantage of the rigorous mathematical reasoning. Introduces the concept of centralizable systems. Lists applications of the concepts in sociology, concerning the existence of factions in human society, public issues of contention, and importance level of problems versus media. Finally, poses a number of open questions.

As the flourish of today’s supply chain, the traditional model of replenishment will cause accumulation of excessive inventory to the retailers and customers, or cause shortages and inability to meet the demands. To solve this problem, Theory of Constraints (TOC) proposed the replenishment model of demand‐pull, combined with the establishment of factory‐warehouse to achieve performance improvement. In the absence of empirical research, this study applied the Bean Game developed by Dr. Goldratt to design a supply chain system for different scenarios, in order to allow players and managers better understanding and supporting the TOC replenishment method through the operations of the game.

An International Competition of Architecture, Urban Development and Sustainable Housing, was held in Mexico in 2001. The aim of the contest was to create a vanguard and imaginative urban and architectural design that could accommodate the local regulation, the concept of sustainability and bioclimatic design. The proposed site is located within Guanajuato city’s periphery

From a critic review of the finalist projects we concluded that although they were very innovative in bioclimatic design they maintained the concept of prototype at the unit level and groups of prototypes layout in the plot at the urban level. We decided to take the same theme as an academic exercise for the following reasons:

• The opportunity to design under the same rules but changing the concept of a traditional mass housing complex to a slice of city that transforms itself in time with incremental dwellings.

• The city of Guanajuato is a colonial city very important for its history, cultural activity and architecture. The urban layout adapts to its rugged surface, which is very similar to the one of the given site.

• The contest program had a similar objective to that of the academic program of the last year of architecture in our University.

From the analysis of Guanajuato City thematic and non thematic elements of the urban tissue and with the aid of the Tissue Model method, students made the urban proposals. The unit proposals were designed with Open Building in mind instead of designing the required prototypes.

This article will focus on the tissue model methodology applied, first to formulate the tissue characteristics of downtown Guanajuato, then to develop the urban layout of the new housing complex and finally to develop the agreement documents for the urban design. Some examples of different final urban and support design will be given.

The purpose of this paper was to study the influence of properties of printed circuit boards (PCBs) on the temperature during micro drilling and obtain the influential mechanism of PCBs based on temperature measurement.

Experiments were carried out to study the influence mechanism of PCB properties on micro hole drilling temperature under high spindle speed. The temperature measurement platform was applied, then the influence of components ratio of PCBs on the temperature of micro-drilling was analyzed by using comparative analysis method. The mass ratio of each kind of material in the PCB was defined as four levels and the influence mechanism of properties of PCBs based on temperature measurement was summarized.

Average filler and lower resin would have a positive impact on micro hole drilling temperature, and the smaller filler size and the even distribution would make it better.

An infrared temperature measurement platform was applied and influential mechanism of PCB properties on temperature was analyzed, which could provide the reference value on the optimization of temperature during micro drilling.

Focuses on the development of an appropriate Web presence for the College of Humanities, Arts and Social Sciences (CHASS) at the University of California, Riverside (UCR), the largest college on the UCR campus, with nineteen academic departments, four formal research centers, offering 55 majors and more than 40 minors. Outlines the vision and the strategy, and summarises the benefits of the project.

In this paper, we take a look at the state‐of‐the‐art of the theory and applications of the so‐called grey systems theory founded in the 1980s. After a brief historical review of the development history of this theory, we look at the main blocks of the theory followed by several successful applications. It is our hope that a reader who does not know anything about this branch of scientific exploration will gain a firm understanding of the basics so that the rest of this special issue becomes possible to comprehend.

The first part of the paper describes the results of an extensive search into two factors which effect, to a high degree, the efficiency of online information retrieval: (i) the manner by which classification codes and keywords are chosen as a means of retrieval by the reviewers of the reference work (ii) the degree in which papers with comparable contents are accorded similar keywords. The influence of these two factors on the practical results is shown by the example of extensive searches: these searches were done manually as well as online. It was concluded that the efficiency of the assigned keywords was very low, owing to their insufficient accuracy and the large number of synonyms, spellings and other words that there may be to express one idea. The purpose of the analysis as described in the second part of the paper is to examine the possibility of finding a good search strategy, in spite of the low efficiency of the assigned keywords, that costs little and has a high efficiency factor. Therefore, a three‐fold situation is examined: (i) the relationship of the search strategy to (ii) the factors affecting cost, and (iii) the efficiency of retrieval. The problems arising in choosing a search strategy are examined; 14 different methods were selected from the large number of possibilities to formulate a search. A method of calculating the factors which affect the connect‐time cost and the offprint costs is worked out. The various strategies, employed to achieve the greatest improvements in cost and efficiency, include classification codes and keywords (subject headings and free terms). This procedure was carried out via an ESA terminal. The results are presented in the form of tables comparing the size of the factors affecting the cost, the judged cost per relevant item and the efficiency of retrieval. The conclusion is that the best search consists of using the classification codes, including the subject, coupled with some carefully selected free terms, for the simplest method, the lowest cost and the highest efficiency of retrieval.