This study proposes DC-ROLL, a new approach to concurrency control in a distributed environment based on the Request Order Linked List (ROLL) [P91] and the Datacycle architecture [H+87]. DC-ROLL allows for more flexibility in levels of concurrency and avoids certain performance bottlenecks of the traditional two-phase locking. Unlike the original Datacycle architecture where the entire database...

It is common knowledge that the alignment condition of rotating machinery affects the equipment's vibration levels and long term reliability, but there is little quantitative information relating the amount of misalignment to the degrading affects of misalignment. Many earlier publications state two reasons for performing precision alignments: 1. improved electrical efficiency and 2. reduced ma...

Background The choice of footwear and custom modification of footwear in fast bowling in cricket lacks biomechanical and clinical evidence. This demonstrates that despite professional advice being available, elite fast bowlers continue to wear shoes that may not be appropriate for them. The aim of this study was to investigate the biomechanical effects of three cricket shoes commonly used by fa...

This little volume was not_ meant to be a cram book, nor in any way a substitute for a textbook on the subject, but was written as a practical guide to nurses, dressers, house surgeons, and general practitioners. It fulfils! its function; admirably. Probably the most useful part of this very useful little book is the three tables which will be found in an envelope at the end of the book; they a...

polyvinyl ester green composites were synthesized with walnut shell powder (wsp) by in-situ polymerization technique. the green composites have been evaluated for mechanical properties such as tensile strength, tensile modulus and hardness. sliding wear loss, specific wear rate and coefficient of friction were investigated by using computerized pin-on–disc machine at normal applied loads of 20,...

friction stir processing was applied for fabricating an aluminum alloy based hybrid nano composite reinforced with nano sized al2o3 and micro sized graphite particles. a mixture of al2o3 and graphite particles was packed into a groove with 1 mm width and 4.5 mm depth, which had been cut in 5083 aluminum plate of 10 mm thick. packed groove was subjected to friction stir processing in order to im...

In this work, homogeneous thermochemical co-precipitation method was used to fabricate W-25wt%Cu nanocomposite. Synthesized nanocomposite powder was calcined and reduced. A hydrogen atmosphere sintering at 1200oC for 105 consolidated the product up to a density close to 98% theoretical density. Wear experiment were carried out using a pin-ondisc set up at three normal loads of 5, 10 and 15 N an...

In this work, homogeneous thermochemical co-precipitation method was used to fabricate W-25wt%Cu nanocomposite. Synthesized nanocomposite powder was calcined and reduced. A hydrogen atmosphere sintering at 1200oC for 105 consolidated the product up to a density close to 98% theoretical density. Wear experiment were carried out using a pin-ondisc set up at three normal loads of 5, 10 and 15 N an...