Spacecraft 2000: The challenge of the future

Considerable opportunity exists to improve the systems, subsystems, components, etc., included in the space station bus, the non-payload portion of the spacecraft. The steps followed to date, the challenges being faced by industry, and the progress toward establishing a new NASA initiative which will identify the technologies required to build spacecraft of the 21st century and which will implement the technology development/validation programs necessary are described

U.S. Preferences for Fish and Seafood: An Evoked Set Analysis

This study used the concept of an "evoked set" to test hypotheses about the determinants of consumer preferences for seafood. Results indicate consumer preferences for seven major fish species (shrimp, lobster, catfish, cod, flounder, scallops, and salmon) are mainly a function of the consumer's geographical location and ethnicity. Consumer beliefs about fish product attributes (e.g., quality, flavor, nutrition) and product category use-experience (frequency of fish consumption) in general are not significant preference determinants, although important exceptions are noted. The composition of the evoked set may have different behavioral implications depending on whether fish consumption occurs in the home or in a restaurant setting.Evoked set, lens model, consumer preferences, seafood demand, marketing, aquaculture, Consumer/Household Economics, Demand and Price Analysis, Environmental Economics and Policy,

COOPERATIVE ADVERTISING RENT DISSIPATION

Generic advertising is used by fish producers to accelerate demand growth to alleviate temporary surpluses. Whether this cooperative promotional venture is profitable depends on a number of factors including industry supply response. A rent-dissipation model applied to the U.S. catfish industry suggests the quasi-rents generated by increased advertising are more than sufficient to cover incremental costs over any reasonable time horizon.Marketing,

The roles of computer self-efficacy, outcome expectancy, and attribution theory in impacting computer system use

TJte process by which individuals accept or reject information technologies was theoretically explained in a model employing attributional relationships and computer self-ejficacy and outcome expectancy. The model was empirically tested using structural equations modeling and data collected in afield setting. The results provided partial confiirmation of the theory that attributions to ability, effort, luck, and task difficulty impact information system use mediated by computer self-ejficacy and outcome expectancy. The stable attributions of ability and task difficulty had meaningful impacts on computer self-ejficacy. Similarly, task difficulty had a meaningful impact on outcome expectancy. The unstable attributes of effort and luck demonstrated meaningful impacts on computer self-ejficacy but not outcome expectancy. In addition, these results showed that computer self-ejficacy had a significant impact on both outcome expectancy and computer system use

The effects of computer self-efficacy and outcome expectancy on end-user job control and stress

This article examines the effects of computer self-efficacy and outcome expectancy on the end-user\u27s sense of felt stress as mediated by job control. A nationwide survey of information technology end-users provided the sample. The results show that computer self-efficacy directly impacts personal and job related outcome expectancies and that computer self-efficacy and job related outcome expectancies directly affect job control. Job control is shown to mediate the impacts of computer self-efficacy and job related expectancies on stress. The results are discussed and implications for information technology managers are presented

The Impacts of End-User Gender, Education, Performance, and System Use on Computer Self-Efficacy and Outcome Expectancy

John W. Henry, Ph.D., is an associate professor of management, Department of Management, College of Business, Georgia Southern University, Statesboro, Ga. Robert W. Stone, Ph.D., is an associate professor of information systems, Department of Business, College of Business and Economics, University of Idaho, Moscow, ID

The oxidation of ascorbic acid and its reduction in vitro and in vivo

The outstanding chemical property of ascorbic acid (vitamin C) is that it is a reducing agent. The suggestion is obvious that its physiological function may be associated with this property, and, if it is oxidized reversibly, with its behavior in an oxidation-reduction system. It is desirable therefore to know the oxidation-reduction potential of ascorbic acid

New options for the treatment of obesity and type 2 diabetes mellitus (narrative review)

AbstractModerate weight loss (>5%), which has been associated with improvements in glycemic parameters in patients with dysglycemia, also reduces the presence of other comorbidities, including dyslipidemia and hypertension, culminating in a reduced risk of cardiovascular disease. Lifestyle changes are the recommended preliminary approach to weight loss, with an initial weight-loss goal of 10% of body weight achieved over 6 months at a rate of 1–2 pounds per week selected as an appropriate target to decrease the severity of obesity-related risk factors. Implementing and maintaining the lifestyle changes associated with weight loss can, however, be challenging for many patients. Therefore, additional interventions sometimes may be necessary. Bariatric surgery can also be a highly effective option for weight loss and comorbidity reduction, but surgery carries considerable risks and is still applicable only to selected patients with type 2 diabetes. Thus, attention is turning to the use of weight-loss medications, including 2 recently approved compounds: twice-daily lorcaserin and a once-daily combination of phentermine and topiramate extended-release, both shown to be safe and effective therapies in the management of obesity in patients with type 2 diabetes