Group self-identification and adolescent cigarette smoking: A 1-year prospective study.

As an extension of previous work, we analyzed the longitudinal relations between group self-identification and adolescent cigarette smoking. The predictive precedence of cigarette smoking and identification with 6 different types of peer groups was examined. Results indicated that 7th-grade group self-identification predicted 8th-grade cigarette smoking, whereas 7th-grade cigarette smoking did not predict 8th-grade group self-identification. Group self-identification also was compared with 7 other psychosocial variables as predictors of smoking 1 yr later. The pattern of results suggests that group self-identification is about as good a predictor of smoking as other psychosocial variables, and that group self-identification is more than a mere proxy of other psychosocial variables. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Organizational structures and service delivery in Nova Scotia.

Surveyed 16 clinical settings in Nova Scotia to determine the nature of the psychological services offered and examined their organizational context. 13 surveys were returned. The majority of the settings provide traditional mental health services. The majority of clinical psychologists are found in general regional hospitals rather than in mental health settings. Psychologists offer a wide array of services, such as those to medical patients. Psychologists practice independently; they are able to assess and treat patients in the absence of either assessment or referral by other professionals. The interests of psychologists tend to be represented at the highest level of their institutions by professionals other than psychologists. There were no organized psychology departments in more than half the settings. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Communications and the personal computer

Communication between personal computers and other computers is a rapidly developing area of computing. The paper provides an overview of the many alternatives currently available for implementing communications on personal computers. The techniques covered include asynchronous and synchronous techniques, terminal emulations, workstation replacement, disc emulators, data concentrators and techniques peculiar to personal computers themselves. Consideration is also given to some of the advantages and disadvantages of each technique, the problems of using imported personal computer software and hardware, and of attaching personal computers to British Telecom lines. The likely factors affecting the future development of personal computer communications are also discussed.     

Energy resources—are we planning for the future?—a review

Many governments are at present attempting to formulate energy strategies for ensuring future supplies. the debate over nuclear power is continuing and ‘pollution-free’ alternative energy sources are also being considered. Points for and against each of the possible energy sources are discussed here and the possible hazards of nuclear power (e.g. radioactivity) are compared with the possible dangers of ‘free-energy’ sources (e.g. an increased ‘greenhouse’ effect). the importance of an integrated energy policy is stressed. Such a policy does not rely on a single energy source but utilizes the full spectrum of possibilities and can incorporate the more immediate concepts of energy savings.     

The production of pork with garlic flavour notes using garlic essential oil

Garlic essential oil (GEO) added directly to pork mince or to the diet of pigs was evaluated for its effectiveness in masking undesirable mutton flavour. Pork was from 31 female pigs (Duroc × (Large White × Landrace)) grown on diets containing either animal-plus-plant products (AP diet) or plant products only (P diet) with four levels of GEO: 0, 0.55, 1.44 and 1.84 g/kg feed and 0, 0.55, 1.44 and 2.15 g/kg feed in the AP and P diet, respectively. Garlic flavour increased and mutton flavour decreased in pork from pigs that consumed more than about 150 g and 220 g of GEO in P and AP diets, respectively over the 57-day feeding period. The garlic flavour was stronger and the mutton flavour less intense for pork from pigs on the P diet. When GEO was added to pork mince at 125 ppm, it significantly reduced mutton flavour.     

评估经济型 x86 CPU：价格下跌的价值

不知道英特尔公司是否因为预期了当前金融危机对全球的影响,所以才开发了经济型Atom CPU,作为保持自己市场份额的一种方式。（该公司公开声明,Atom的主要意图是拓宽x86架构的应用基础。）另外还有件不明确的事,即Atom有可能拆英特尔更高利润微处理器的台,从而对公司的长期收益与利润产生负面影响。不过,在今天不景气的经济下,任何强劲的销售指标都是少见而有激励性的标志。现在所谓的上网本要占到PC增长的很大一部分,而Atom为多数上网本的设计提供了动力引擎,因此英特尔这种用Atom代替自己的CPU,而不是让竞争对手去占据市场的实用主义方法应该获得货赏。     

薄膜电阻器提供不渗透硫的解决方案

当前的小型化趋势将电阻器技术推到了极限。例如,0201尺寸的片状电阻器仅封装就大约占到了元件总成本的60％。对某些在电路板上同一相邻位置使用相同电阻值的设计来说,片状元件阵列可以帮助缓解布局和封装问题。不过,这并不适用于所有厂商。     

Applicability of Pressurized Liquid Extraction for Melamine Analysis in Pet Foods with High-Performance Liquid Chromatography with Diode Array Detection

A pressurized liquid extraction (PLE) method was developed for melamine analysis in pet foods. The PLE method which utilized an accelerated solvent extraction (ASE®) system was also compared with sonication and polytron extraction methods. The parameters for the optimized PLE method were temperature (75?°C for wet pet food, 125?°C for dry pet food), pressure (1,500 psi), static time (10 min), flush volume (40%), purge time (1 min), and number of cycles (1). Recoveries obtained by PLE method were significantly higher (P?≤?0.05) than those of sonication and polytron methods for dry pet food samples. For the analysis of adulterated pet foods, PLE resulted in the highest melamine content followed by sonication and polytron. Using PLE, samples fortified with melamine at 2.5 and 100 mg kg^?1 resulted in recoveries ranging from 55% to 90% for wet samples and from 90% to 116% for dry samples. Low recovery rate from wet samples at low spike level (2.5 mg kg^?1) may have been caused by co-aggregation of polysaccharide and protein with melamine due to low pH during solid-phase extraction cleanup. Limit of detection and limit of quantification values were 0.5 (mg kg^?1) and 1.0 (mg kg^?1) for dry samples. Overall, PLE had the best extraction efficiency compared to sonication and polytron, proving PLE to be a useful tool for melamine analysis of pet foods.     

Quantitative analysis of the cross-linked structure of microgels using fluorescent probes

Properties of polymeric microgels are influenced by the internal polymer cross-linked structure, but tools to quantitatively analyze this internal structure are limited. With the finding that polymer networks alter the diffusivity and subsequent excimer formation of pyrene, this study used the ratio between pyrene excimer and monomer emission to determine the number of cross-links (N) and average pore size (ξ) in poly(ethylene glycol) diacrylate (PEGDA) microgels. A calibration curve to relate pyrene emission to N and ξ in PEGDA hydrogels was prepared and used to calculate N and ξ in PEGDA microgels. The pyrene emission indicated that PEGDA microgels had a higher cross-linking density and a smaller average pore size when compared with bulk cross-linked hydrogels of the same PEGDA concentration. The analytical method demonstrated in this study may be useful for fine-tuning polymeric microgel properties for a broad array of applications.     

Grafting of polystyrene “from” and “through” surface modified titania nanoparticles

We report the surface modification of titania (TiO₂) nanoparticles with azo-based radical initiator and vinyl (acrylate) polymerizable groups. This is achieved through the reaction of the surface hydroxyl groups of the titania with acid halides. Polymer (specifically, polystyrene) was grafted “from” the surface using the azo-modified titania, and “through” the surface of the vinyl-modified surface. Both conventional radical and reversible addition-fragmentation chain transfer (RAFT) polymerizations were performed. The surface-modified titania and the polystyrene-titania nanocomposites were characterized using IR spectroscopy, thermogravimetric analysis and gel permeation chromatography.