ISO 9000 versus CMM: Standardization and certification of IS development

A growing number of software developers use standards as a basis for their quality systems. Some of them go one step further and have their quality systems certified. In this paper, two well-known quality standards, ISO 9000 and the CMM, are compared. It is concluded that both standards are useful but there is a growing need for more specific standards.     

Electrolytic manganese metal from chloride electrolytes. II. Effect of additives

Results of beaker scale and large laboratory scale experiments on the deposition of manganese from chloride electrolytes using selenium based additives are reported. High cathode efficiencies (85–90%) were obtained at moderate selenium levels (0.03–0.06 gl^–1). Selenium pick-up in the deposit was lower when selenium was added as the selenate [Se(VI)].A cost/benefit analysis of selenium additions is presented.     

Family-genetic study of executive functioning in attention-deficit/hyperactivity disorder: Evidence for an endophenotype?

This study examined familiality of attentional control and mental flexibility in multiplex attention-deficit/hyperactivity disorder (ADHD) families. The authors hypothesized that siblings of ADHD probands, although not behaviorally expressing ADHD, have deficits in these executive functions and that the performance of probands, unaffected siblings, and control participants are on a continuum. Participants (aged 6 to 17) were 25 ADHD probands with a family history of ADHD, their 25 unaffected siblings, and 48 control participants. The unaffected siblings did not differ from the ADHD probands on attentional control or on some measures of mental flexibility. Linear changes in performance across the groups reflected an intermediate position of the unaffected siblings between the probands and control participants. These results suggest that these executive functions may be suitable endophenotypes of ADHD. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Use of partial budgeting to determine the economic benefits of antibiotic treatment of chronic subclinical mastitis caused by Streptococcus uberis or Streptococcus dysgalactiae

The economic effect of lactational antibiotic treatment of chronic subclinical intramammary infections due to Streptococcus uberis or Streptococcus dysgalactiae was explored by means of partial budgeting. Effects at cow level and herd level were modelled, including prevention of clinical mastitis episodes and the prevention of transmission of infections. Input variables for our deterministic model were derived from literature or based on 2002/2003 dairy prices and farming conditions in The Netherlands. Sensitivity analysis was used to examine the effect of uncertainty around input variables or changes in price estimates. On farms where pathogen transmission was prevented through proper udder health management, 3-d antibiotic treatment during lactation resulted in an average net profit of euro+11.62 over no treatment while 8-d antibiotic treatment had an average negative net result of euro-21.83. Sensitivity analysis showed that profitability depends on the probability of treatment-induced cure, pathogen transmission rates, culling rate, retention pay-off, and costs of antibiotic treatment. Three-day antibiotic treatment of chronic subclinical streptococcal mastitis is economically profitable over a range of input values for cure probabilities, transmission rates and losses due to culling. In contrast, 8-d lactational treatment is only profitable for very valuable animals, on farms where the risk of pathogen transmission is high and/or when the farmer is likely to cull a high percentage of cows with subclinical mastitis. Because bacterial flora, cow characteristics and management differ widely between farms, the economic outcome of lactational treatment of chronic subclinical streptococcal mastitis may be highly farm-dependent.     

Odorous products of the chlorination of phenylalanine in water: formation, evolution, and quantification

To explain some of the possible origins of an odor episode which took place in a drinking water supply in the region of Paris (France), the chlorination reaction in water of phenylalanine was studied. This amino acid was chosen for first experiments because of its physical and chemical particular properties. Changes in the different byproducts formed were followed by high-performance liquid chromatography (HPLC) over a period of time. N-chlorophenylalanine (mono-N-chlorinated amino acid) and then phenylacetaldehyde were the major products formed for the lower chlorine to nitrogen molar ratios. For Cl/N molar ratios of 1 and beyond, phenylacetonitrile and N-chlorophenylacetaldimine appeared and increased with the chlorination level. N-chlorophenylacetaldimine was quantified by using its difference of stability in various organic solvents. Our attention was first directed to the monochlorinated derivative but further examination indicated that it could not be responsible for odor troubles: it dissociated before reaching the consumer's tap and it was produced at consistently low yields under conditions relevant to drinking water treatment. On the contrary, chloroaldimine appeared to be a very odorous and water-stable product: it strongly smells of swimming pool with a floral background. The odor detection threshold is about 3 microg x L(-1) and it can persist for more than one week at 18 degrees C. It is now suspected of being a source of off-flavor concerns among consumers.     

Non-public and public online community participation: Needs, attitudes and behavior

Nonpublic participation within an online community, often called lurking, occurs when an individual joins a community, but does not post. This study examines the nature of lurking, why people lurk and the differences in attitudes between lurkers and posters. The results indicate significant differences between people who lurk and those who post in an online community. We conclude that when people lurk they are observing, which in no way is a negative behavior. This introverted or passive behavior affects lurkers' attitudes about the benefits of the community, their expectations, and opinions of themselves and others who lurk. In general lurkers are less optimistic and less positive than those who post. Blair Nonnecke is a usability professional and academic with a particular interest in user-centred design and online communities. Blair is an Associate Professor at the University of Guelph where he studies participation in online communities and the usability of in-vehicle navigation devices. His recent research focuses on three areas: survey methods for hard to reach participants, the role participation plays in online learning environments, and factors leading to participation in communities of practice. Dorine Andrews D.C.D. As a specialist in communications design, Dr. Andrews' research and publications focus on both online communities and the implementation of major technology change in organizations. She has taught at Georgetown University's Communications, Culture and Technology program and at the University of Baltimore's School for Interaction Design and Information Architecture. She is now a principal change consultant for RWD Technologies, Inc. headquartered in Baltimore, MD. She can be reached via e-mail at dandrews@rwd.com Jennifer Preece is Professor and Dean of the College of Information Studies at the University of Maryland, USA. Her research and teaching interests focus on human-computer interaction, online communities and social computing. She has authored many papers and books on these topics. Her two most recent books are: Online Communites: “Designing usability, supporting sociability”, and a coauthroed book with Helen Sharp and Yvonne Rogers entiled “Interaction Design: Beyond Human-Computer Interaction”. Both books are published by John Wiley & Sons.     

Rapid coal characterization by FT-i.r. spectroscopy

A method is described for the rapid characterization of bituminous coals based on factor analysis of the FT-i.r. spectra of a wide variety of coals from several countries. Correlations between the factor loadings and some significant coal properties are reported. Weaker, but in some cases still useful, correlations were made between coke properties and factor loadings from analysis of the FT-i.r. spectra of the corresponding coals or coal blends.