An east-west asymmetry in the solar wind velocity

East-west asymmetry in solar wind velocit

ECONOMIC IMPACT OF INTRODUCING ROTATIONS ON LONG ISLAND POTATO FARMS

Potatoes have been grown continuously on many Long Island (New York) fields. Environmental concerns have raised questions about the continued usage of this practice. A farm-level linear programming model was used to investigate the economic impacts of crop rotations which result in reduced potato acreage. Crop rotations (an Integrated Pest Management tactic) reduced total pesticide use, but also reduced returns above variable costs as successively stringent rotation requirements were forced into the solution. The crop rotations which caused the least effect on income were identified.Resource /Energy Economics and Policy,

Observation of the angular momentum flux carried by the solar wind

Angular momentum flux carried by solar wind calculated from Mariner 5 dat

Cosmic ray modulation and turbulent interaction regions near 11 AU

When Voyager 2 was near 11 AU, the counting rate of nuclei approx 75 MeV/nucleon decreased during the interval from July, 1982 to November, 1982, and it increased thereafter until August, 1983. A decrease in cosmic ray flux was generally associated with the passage of an interaction region in which the magnetic field strength B was higher than that predicted by the spiral field model, B sub p. Several large enhancements in B/B sup p were associated with merged interaction regions which probably resulted from the interaction of two or more distinct flows. During the passage of interaction regions the cosmic ray intensity decreased at a rate proportional to (B/B sup p -1), and during the passage of rarefaction regions (where B/B sup p 1) the cosmic ray intensity increased at a constant rate. The general form of the cosmic ray intensity profile during this approx 13 month minicycle can be described by integrating these relations using the observed B(t). Latitudinal variations of the interaction regions and of the short-term cosmic ray variations were identified

The influence of emotional reaction on help seeking by victims of school bullying

Research has started to focus on how victims of school bullying cope, but there is still very little understanding if why pupils cope in one way and not another. This paper aimed to examine the effects of gender, school-stage, frequency of victimization and different emotions (anger, vengeance, self-pity, indifference, and helplessness) upon the choice of social support that children report using. Questionnaires were completed by 6282 Maltese schoolchildren aged between 9 and 14 years old. Analyses revealed that specific patterns of emotion and victimization predict whether pupils report using certain sources of social support. Results are discussed in relation to their relevance for possible intervention, future research needs and implications for the theoretical framework used

Artificial reef for artisanal fisheries enhancement - an attempt off Trivandrum coast

Several demersal fishes arc found to congregate in the vicinity of submerged objects such as reefs, logs, ship-wrecks and rock out-crops where plants and bcnthic animals flourish than in areas where the bottom is flat and barren. These communities serve as food for larger predators. Submerged objects may, at times, provide shelter and even spawning locations for manya- fish. Underwater observations made by divers while retrieving portions of submerged vessels also report that such habitats harbour considerable concentration of fishe

Artificial reef for artisanal fisheries enhancement - An attempt off Trivandrum coast

Reefs were constructed mostly in the sandy region at a depth varying from 5 to 27m. Granite stones of varying sizes were put first on the site selected for the reef construction so as to form a circular or rectangular ridge. Eventhough fishing was done throughout the year in the neighbouring areas, in the reef environment, it is done only during the calm season between November and April. Tthe landing during 1987-'88 from the reef environment was only 59.0 tonnes. A drastic reduction in the landing from the reef environment could be noted during the subsequent year, ie., 1988-'89, with a total of 24.2 tonnes. The percentage contribution of fishes from the artificial reef environment dwindled to 3.6 from 8.5. Fishes like Decapterus dayi, Carangoides plagiotaenia, Priacanthus hamrur, Sphyraena sp. Rastrelliger kanagurta and Nemipterus spp. dominated the catch of the reef region. From the present study the general guidelines for the placement of artificial reefs are suggested

Airborne mapping of complex obstacles using 2D Splinegon

This paper describes a recently proposed algorithm in mapping the unknown obstacle in a stationary environment where the obstacles are represented as curved in nature. The focus is to achieve a guaranteed performance of sensor based navigation and mapping. The guaranteed performance is quantified by explicit bounds of the position estimate of an autonomous aerial vehicle using an extended Kalman filter and to track the obstacle so as to extract the map of the obstacle. This Dubins path planning algorithm is used to provide a flyable and safe path to the vehicle to fly from one location to another. This description takes into account the fact that the vehicle is made to fly around the obstacle and hence will map the shape of the obstacle using the 2D-Splinegon technique. This splinegon technique, the most efficient and a robust way to estimate the boundary of a curved nature obstacles, can provide mathematically provable performance guarantees that are achievable in practice

Stress appraisal, coping, and work engagement among police recruits: an exploratory study.

This study investigated the influence of stress appraisal and coping on work engagement levels (Absorption, Vigour, and Dedication) of police recruits. Participants were 387 men, ages 20 to 33 yr. (M = 24.1, SD = 2.4), in their last month of academy training before becoming police officers. Partially in support of predictions, work engagement was associated with Stressor control perceived, but not Stress intensity experienced over a self-selected stressor. Although the three dimensions of work engagement were explained by Stressor control and coping, Absorption was the dimension better explained by these variables. Police recruits reporting higher Absorption, Vigour, and Dedication reported using more Active coping and less Behavioural disengagement. Results showed that stress appraisal and coping are important variables influencing work engagement among police recruits. Findings suggested that future applied interventions fostering work engagement among police recruits should reinforce perceptions of control over a stressor as well as Active coping strategies