A conditional decision procedure for high yield processes

A control chart based on the cumulative count of conforming items between two successive nonconforming ones has been shown to be useful in manufacturing industries, particularly for high-quality processes. However, as the decision is based on a single count value, it is relatively insensitive to process shifts. In this paper a conditional procedure is proposed whereby the sensitivity is improved when the process shift is moderate to large in either direction. In addition, optimal limits are defined in such a way that the average run length becomes maximum when the process average is at the nominal level. The performance of the conditional chart and its optimal limits are investigated and compared with the traditional case. The idea of a conditional procedure is to utilize some of the previous runs when a count value exceeds the limits. This procedure is similar to the supplementary run rules, but the conditional procedure is used when the process is out side of the control limits whereas the supplementary run rules focuses on the in-control situation. The conditional procedure has tighter limits than its original chart. The tighter limits together with the conditionality take care of the process without sacrificing its original in-control probability whilst improving the sensitivity.     

Evaluation of the effect of dosage, pH and contact time on high-dose phosphate inhibition for copper corrosion control using response surface methodology (RSM)

The response surface methodology (RSM), particularly Box-Behnken design model, was used in this study to obtain the optimum operating conditions for reduction of copper corrosion by-product release using high-dose polyphosphate inhibition. Furthermore, the RSM was also applied to study the main and interactive effects of the parameters investigated. Both analysis of variance (ANOVA) and coefficient of determination (R²) showed that the RSM approach was appropriate for the optimization of high-dose polyphosphate inhibition. The main effects of polyphosphate dosage and pH were found significant in reducing copper release using high-dose polyphosphate whereas the effect of contact time was less significant. In terms of interactions between the effects, the relation between polyphosphate dosage and the pH was the most significant. The optimal polyphosphate dosage, pH and contact time were found to be 22-28 mg/L of polyphosphate as P, 9-10, and 36 h, respectively. The highest total copper release reduction was estimated as 95.86% under the optimum condition. Surface analysis using both SEM-EDX and XRD discovered that cupric phosphate was present on the copper surface treated with high-dose polyphosphate inhibition. This implied that cupric phosphate could be responsible for the reduction of copper release by forming a protective layer.     

下一代电子装置使用的过电流和过电压保护元件

防静电、防过电流和过电压冲击是目前工程师设计电子产品时必须考虑的一个问题，否则这些产品的市场销路一定会大打折扣。本文集中探讨了目前市场上所有的电路保护技术，并展望了未来电路保护器件的发展方向。     

Integrated optic dispersion slope equaliser for N×20 Gbit/sWDM transmission

The fabrication of a dispersion slope equaliser on a silica-based planar lightwave circuit for 16×20 Gbit/s wavelength division multiplexing transmission is reported. This device comprises an array of sixteen equalisers with different compensation values and an arrayed-waveguide grating for wavelength multiplexing     

Correlation of material properties to reliability performance of anisotropic conductive adhesive flip chip packages

The anisotropic conductive adhesive (ACA) is a promising solder alternative candidate that shows potential for further pitch reduction. Although much work has been published on ACA joint behavior, study on correlation of material properties with reliability performance is still lacking. The main objective in this study was to identify the impact of material properties on reliability, so as to engineer highly reliable microelectronics assemblies. Four representative ACA materials (both film and paste types) with diverse properties were selected. Material properties were characterized as close as possible to "stress test" conditions so as to allow more accurate correlation predictions. Reliability performance was obtained by assembling test chips of 200-/spl mu/m pitch onto BT-substrates, then subjecting them to reliability tests. Correlation analysis was conducted and key material properties that contributed to good reliability performance were identified. Findings indicated that the best properties for high reliability assemblies were: high adhesion strength after subjecting to "stress aging", low coefficient of moisture expansion (CME) and low elastic modulus (E).     

A simple computational procedure for optimization problems with functional inequality constraints

In this note, a simple computational procedure is given for solving a class of optimization problems, where an objective function is to be minimized subject to conventional inequality constraints as well as to inequality constraints of the functional type.     

Review of Enemies of freedom: Understanding right-wing authoritarianism.

Reviews the book, Enemies of freedom: Understanding right-wing authoritarianism by Bob Altemeyer (see record 1988-98419-000). This book is the second of a projected three volume series by Altemeyer on the right-wing authoritarianism (RWA) construct. In this volume, Altemeyer (1988) reports the results of further research conducted since the first volume using his RWA scale. Specifically, three issues are dealt with: (1) how RWA develops in the individual, (2) why RWA is organized the way it is, and (3) how RWA can be controlled in a democratic society. Altemeyer's underlying assumption in this and the preceding volume is that a considerable potential for RWA exists in countries like Canada and the United States and that it is therefore a potentially serious problem requiring vigilance and perhaps ultimately preventive measures. Are his fears in this regard justified? It depends on how seriously one takes the respondents' self-reports. Altemeyer repeatedly shows that individuals (usually college students) who score high on the RWA scale are reportedly willing to punish others and to endorse actions that would curtail the civil rights of others, especially those with left-wing political leanings, who threaten the established order. However, in most instances, the measures are attitudinal ones dealing with respondents' reactions to hypothetical incidents and situations as to what they might do or would endorse having others do. Thus, Altemeyer's fears of the high RWA scorers and the seriousness of their threat to North American and other societies depend on knowing how willing they would be to act on their personal inclinations. Be that as it may, from a number of angles Altemeyer's current book on RWA deserves close and thoughtful reading by social, personality, and developmental psychologists. Those interested in political psychology, a relatively new area attracting social and personality psychologists and political scientists, will find it especially valuable and insightful. As noted earlier in the review, both of Altemeyer's RWA volumes should be required reading for would-be constructors of personality and attitude scales. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Minor constituents of palm oil

Crude palm oil contains about 1% of minor components including carotenoids, tocopherols, sterols, triterpene alcohols, phospholipids, glycolipids and terpenic and paraffinic hydrocarbons. The nutritionally important components such as carotenes and tocopherols also improve stability of the oil. Although a highly valued product, carotene unfortunately is bleached or destroyed in refining because suitable recovery technology is not available. Thermal degradation of carotene, previously suspected of giving rise to undesirable chemicals, now is known to furnish mainly harmless hydrocarbons, most of which are removed by the deodorization step in refining. Tocopherols, being natural antioxidants, need to be carefully preserved during milling, refining, fractionation and modification of palm oils. The accumulation of tocopherols in the palm fatty acid distillate promises to provide a new source for the recovery of this valuable substance. The role played by phospholipids is frequently misunderstood because they can act in two ways, i.e. as an antioxidant synergist and a surface active agent to disperse impurities in oil. In crude palm oil the phospholipid content is small, because most of it is removed during milling; the phosphorus content is due mainly to inorganic phosphorus. Among the sterols, cholesterol constitutes too small a percentage to be of much concern. Sterols, triterpenoids and terpenoid hydrocarbons are also potentially useful side products should recovery technology become available. Other newly characterized minor and trace components also are discussed.     

Influence of filter media depth and vegetation on Faecal Coliform removal by stormwater biofilters

Biofilters are promising technologies that widely applied in the treatment of urban stormwater. However, the microbial removal capacity performance depends greatly on the design of biofilters. Hence, this laboratory study attempts to investigate the influence of filter media depths (i.e. 150, 250, 350 and 450 mm) and the variation of native plants, that is, Cow Grass (Axonopus compressus) and Pearl Grass (Axonopus compressus, dwarf) in removing stormwater microorganism particularly Faecal Coliform (FC). Findings showed that a minimum media depth of 300 mm was required to achieve >1 log FC removal. The mean removal of FC at 450 mm depth filter exceeded 2 log for both Cow and Pearl grass biofilter columns. Results showed that there was no statistically significant difference in vegetation type on the performance of FC removal, however, Cow grass biofilter column revealed higher FC mean log removal compared to Pearl grass biofilter column.