This work aims at studying the effect of the milling conditions on the microstructure and mechanical properties of a ZrB₂-5 vol% Si₃N₄ matrix reinforced with chopped Hi-Nicalon SiC fibers. Several composites were obtained using different milling conditions in terms of time, speed and type of milling media. The composites were prepared from commercial powders, ball milled, dried and shaped, and ...

In this paper, we examine the stock market efficiency of the members of the Association of South East Asian Nations (ASEAN). We use the conventional individual variance ratio tests like the Lo and MacKinlay (1988) test, Choi (1999) test, Wright (2000) test and Chen and Deo (2006)) test to check for the efficient market hypothesis in these markets. We also perform the spectral shape test of Durl...

Motivated by the influenza vaccine industry, we study a supply chain contracting problem under the presence of uncertainties that are related to product design, delivery, and demand, respectively. The supply chain consists of a manufacturer and a retailer, where the retailer places an order before the flu season starts and the manufacturer decides on when to produce the products. Because produc...

We observed that Conjunctive Normal Form (CNF) encodings of structured SAT instances often have a set of consecutive clauses defined over a small number of Boolean variables. To exploit the pattern, we propose a transformation of CNF to an alternative representation, Conjunctive Minterm Canonical Form (CMCF). The transformation is a two-step process: CNF clauses are first partitioned into disjo...

This paper reviews the recent developments in the field of the variance-ratio tests of random walk and martingale hypothesis. In particular, we present the conventional individual and multiple VR tests as well as their improved modifications based on powertransformed statistics, rank and sign tests, subsampling and bootstrap methods, among others. We also re-examine the weak-form efficiency for...

In this study, metal matrices composite samples has been produced by saturating the Al2014 alloy into the 105μm particle sized SiC powder helping with pressured infiltratiıon technique. The SiC powder has been filled into the tube with 70 mm in height and has been fixed from two ends. The infilitration has been performed in 3 minutes, under N2 argon atmosphere and 700kPa constant pressure and i...

Contracts enable mutually suspicious parties to cooperate safely through the exchange of rights. Smart contracts are programs whose behavior enforces the terms of the contract. This paper shows how such contracts can be specified elegantly and executed safely, given an appropriate distributed, secure, persistent, and ubiquitous computational fabric. JavaScript provides the ubiquity but must be ...

Negative Poisson's ratio foam was used in the development of seat cushions which exert reduced peak pressure upon the skin of seated persons. Foam processing techniques were scaled up. A longer processing time was required for cushion size samples in comparison with small samples. Pressure distributions on a seated subject were measured using a pressure-sensitive array. Seated pressure distribu...

This paper studies how renegotiation and information persistence shape long-term contracts in principal-agent relationships. Truthful contracts that are renegotiation-proof, according to a concept tailored to account for persistence in the agent’s type, are characterized by their sensitivity to the reports of the agent. The sensitivity of the optimal renegotiation-proof contract is increasing i...

This paper focusses on survey expectations and discusses their uses for testing and modeling of expectations. Alternative models of expectations formation are reviewed and the importance of allowing for heterogeneity of expectations is emphasized. A weak form of the rational expectations hypothesis which focusses on average expectations rather than individual expectations is advanced. Other mod...