Joining Member Research Articles

Cam Elyaf Kumaş İle Desteklenmiş Köşe Birleştirmelerde Eğilme Moment Direnci

Aim of study: This study aimed to determine the effects
 of glass fiber reinforced polymer (GFRP) and adhesives type on the diagonal
 compression and tensile strength in L-type corner joints connected by a wood
 biscuit.
 
 Material and Methods: Medium density fiberboard coated with melamine plate
 (MDFlam), wood biscuit with a size number of 20 (dimension: 56 × 23 × 4 mm) as
 the joining member, GFRP for strengthening purposes, and polyvinyl acetate
 (PVAc-D4), polyurethane (PU-D4), and epoxy glues as adhesives were used. The
 diagonal compression and tension tests were carried out under static load
 according to ASTM-D1037 standards.
 
 Main results: Results indicated that using GFRP
 significantly increased the diagonal compression and tensile strength of L-type
 corner joints connected by a wood biscuit.
 
 Highlights: It is recommended to use the combination of GFRP and
 epoxy adhesive in the corner joints to have better compression and tensile
 strength in furniture.

Temperature distribution during laser based heat conduction welding of CFRP

For the implementation of carbon fiber reinforced (CFRP) parts, these need to be assembled to more complex structures. Therefore, laser transmission welding was transferred to heat conduction welding for joining thermoplastic CFRP to itself. The goal of these investigations was to determine the influence of the focal point geometry and the main fiber orientation within the CFRP on the temperature distribution at the upper joining member. A set-up was chosen consisting of two thermo cameras in order to measure the process temperatures on top and underneath the upper joining member. Furthermore, the heat affected width was determined and correlated to the process temperatures.

Financial implications of compliance with EU waste management goals: Feasibility and consequences in a transition country.

This paper outlines the approach that can assist decision makers to have first preliminary insights regarding costs of complying with requested European Union municipal waste management goals in transition and developing countries. Serbia, as a joining member of European Union, must confront itself with the challenges resulting from European Union waste management directives. Implementation of waste separation units and the construction of sanitary landfills is already in place in Serbia. However, new waste management practice will need additional transformation and will require implementation of waste treatment technologies for additional management of generated waste. Implementation of analyzed best available technology/techniques for waste treatment can support the country's effort in reaching the policy goals. However, the question here is how much will the implementation of additional waste treatments influence the overall waste management costs? Results of the scenario's financial viability show that composting and sanitary landfill are the most viable solutions regarding the costs, even under increasing discount rates. Although different discount rates influence the overall gate fees and net present values, the level of affordability for different scenarios remains the same.

A new Application-Level Multicast technique for stable, robust and efficient overlay tree construction

Even though Application Level Multicast (ALM) protocols are proposed as an efficient alternative to the classical IP multicast model, they still suffer from the same rearrangement overhead problem. Indeed, when a member joins or leaves the multicast session, a part of the overlay tree should be rearranged. This rearrangement overhead can significantly disturb the fluidity of the application data stream received by other members. In addition, the efficiently of the constructed overlay tree depends entirely on the honesty and the cooperation of all participating members. However such behavior cannot be guaranteed and some selfish and non-cooperative nodes may take profit from the honesty of other members in the overlay. In this paper we present a new technique, called Membership Duration Aware ALM (MDA technique), that takes advantage of the announced membership duration of each new joining member in order to construct a more stable and robust overlay trees. Our technique can be used together with any existing centralized or distributed ALM protocol to reduce the overall rearrangement overhead. Simulation results confirm the efficiency of our technique when applied to both centralized and distributed ALM protocol. Then, we analyze in depth the impact of cheating nodes on the performances and the stability of overlay trees constructed by our MDA-ALM protocol.

Improvement of lithology and saturation determined from well logging using statistical methods

Results of selected statistical analyses applied to well-logging data in a typical borehole in the Miocene thin-bedded formation are presented. Primary geological data in the form of lithology core descriptions was included as a joining member between logs and lithology. Principal component analysis enabled data space to be reduced. It incorporated new variables, PC, in place of logs, preserving the same petrophysical information. Clustering, discrimination and classification were tools facilitating data arrangement and preliminary data grouping according to natural petrophysical features of analysed rocks. Processing of well-logging data alone with the use of statistical methods contributed to correct evaluation of the lithology and saturation for the thin-bedded Miocene deposits. Such an approach can be advantageous for the preliminary qualitative evaluation of productive horizons.

CFRP接合部材を利用した自動車用スペースフレーム構造の結合剛性と衝撃強度に関する研究(技術OS1-1 軽量化構造の強度・剛性設計,技術OS1 自動車の強度・剛性・疲労信頼性設計と評価)

CFRP接合部材を利用した自動車用スペースフレーム構造の結合剛性と衝撃強度に関する研究(技術OS1-1 軽量化構造の強度・剛性設計,技術OS1 自動車の強度・剛性・疲労信頼性設計と評価)

The performance of QoS‐aware IP multicast routing protocols

AbstractResearch in the area of QoS‐aware dynamic multicast routing protocols has been very active in recent years. Protocols based on dynamic Steiner tree strategies, such as YAM and QoSMIC, have been consistently shown to outperform those based on shortest path heuristics, such as PIM and DVMRP. However, these protocols all suffer from the problem of poor scalability for one or more of the following reasons: high control overhead, insufficient robustness with the adoption of a centralized group manager, and excessively long join latency. In addition, these protocols perform well only when group members are either densely populated or sparsely populated, but, unfortunately, not both. In this paper, we propose a protocol, named DSDMR, which can adapt its strategy based on sensed group member densities. Underlying DSDMR is an adaptive two‐direction join mechanism that tries to find good attaching points for new group members either from the source or from the new joining member depending on member densities. We evaluate our scheme using extensive simulations and found that DSDMR can build multicast trees with costs close to the best greedy strategy, very low control overhead, and very short join latency across a wide member density spectrum. Furthermore, its success ratio is only slightly lower than is the best greedy strategy in finding feasible routes subject to both bandwidth and end‐to‐end delay constraints. © 2003 Wiley Periodicals, Inc.