The strength of concrete is a function of the proportions of the constituent materials, namely, cement, water, fine and coarse aggregates. The conventional methods used to determine the mix proportions that will yield the desired strength, are laborious, time consuming and expensive. In this paper, a mathematical method based on modified regression theory is formulated for the prediction of con...

AIM OF THE STUDY To evaluate and compare the linear dimensional changes of the three representative polyvinyl siloxane (PVS) impression materials and to compare the accuracy of single mix with double mix impression technique. METHODOLOGY A study mold was prepared according to revised American Dental Association specification number 19 for nonaqueous elastic dental impression materials. Three ...

We describe a MIX cascade protocol and a reputation system that together increase the reliability of a network of MIX cascades. In our protocol, MIX nodes periodically generate a communally random seed that, along with their reputations, determines cascade configuration. Nodes send test messages to monitor their cascades. Senders can also demonstrate message decryptions to convince honest casca...

Statistical disclosure is a well-studied technique that an attacker can use to uncover relations between users in mix-based anonymity systems. Prior work has focused on finding the receivers to whom a given targeted user sends. In this paper, we investigate the effectiveness of statistical disclosure in finding all of a users’ contacts, including those from whom she receives messages. To this e...

A computer program, MIX, was designed to identify pairs of chemicals whose interaction results in a response that departs significantly from the model predicated on the assumption of independent, uncorrelated joint action. This report describes the MIX program, its statistical basis, and instructions for its use. a research entomologist, is in charge of the unit developing improved technology f...

The DASH model for Power Portfolio Optimization provides a tool which helps decision-makers coordinate production decisions with opportunities in the wholesale power market. The methodology is based on a stochastic programming model which selects portfolio positions that perform well on a variety of scenarios generated through statistical modeling and optimization. When compared with a commonly...

the aim of this study was to investigate the role of international sporting goods fair in developing sport market regarding marketing mix (5ps). the study used a descriptive and field method and was conducted as a survey. the statistical population included all sporting equipment and goods producers who participated in the international fair (n=72 companies) and the sample equaled the populatio...

We introduce and investigate sleeper attacks and explore them in the context of anonymous communication, especially mix networks. Sleeper attacks can make use of the interference inherent to mix protocols. Simply by leaving his own messages in a mix network an adversary can learn about the communication of network users. Sleeper attacks can be combined with epistemic attacks, statistical disclo...

OBJECTIVE To detect changes in mortality after surgery, with allowance being made for variations in case mix. DESIGN Observational study of postoperative mortality from January 1992 to August 1995. SETTING Regional cardiothoracic unit. SUBJECTS 3983 patients aged 16 and over who had open heart operations. MAIN OUTCOME MEASURES Preoperative risk factors and postoperative mortality in hos...