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Search Results: 1 - 10 of 1143 matches for " Moshe Hartman "
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Do Gender Differences in Undergraduate Engineering Orientations Persist when Major is Controlled?
Harriet Hartman,Moshe Hartman
International Journal of Gender, Science and Technology , 2009,
Abstract: The question posed in this paper is how persistent are gender differences in engineering orientation and achievement, once we control for engineering discipline, cohort, and year in the program. The data come from a multi-year survey of engineering students at a mid-Atlantic public university, which has four engineering disciplines: chemical, civil/environmental, electrical/computing,and mechanical, which vary by proportion of women in them. Using multivariate analysis, we control for gender, cohort, year in the program, and major in the analysis of differences in engineering self-confidence, satisfaction with the core course and interpersonal climate, engineering grades, expectations from the undergraduate degree and long-term commitment to a career in engineering.We then are able to isolate the significant gender differences and interaction effects that persist when these other factors are held constant. We find that gender clearly matters with respect to engineering grades, self-confidence, satisfaction with the core course, and commitment to the engineering career, even when major, year, and cohort (and grades, for all of the other dependent variables) are controlled. However, gender differences with regard to peer integration are insignificant; and there are few remaining gender differences with regard to expectations from an engineering degree. Suggestions for further research are proposed.
Randomized distributed access to mutually exclusive resources
Moshe Dror,Bruce Hartman,Gary Knotts,Daniel Zeng
Advances in Decision Sciences , 2005, DOI: 10.1155/jamds.2005.1
Abstract: Many systems consist of a set of agents which must acquire exclusive access to resources from a shared pool. Coordination of agents in such systems is often implemented in the form of a centralized mechanism. The intervention of this type of mechanism, however, typically introduces significant computational overhead and reduces the amount of concurrent activity. Alternatives to centralized mechanisms exist, but they generally suffer from the need for extensive interagent communication. In this paper, we develop a randomized approach to make multiagent resource-allocation decisions with the objective of maximizing expected concurrency measured by the number of the active agents. This approach does not assume a centralized mechanism and has no need for interagent communication. Compared to existing autonomous-decentralized-decision-making (ADDM)-based approaches for resource-allocation, our work emphasizes achieving the highest degree of agent autonomy and is able to handle more general resource requirements.
Harmonic Oscillator with Fluctuating Mass  [PDF]
Moshe Gitterman
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.210140
Abstract: We generalize the previously considered cases of a harmonic oscillator subject to a random force (Brownian motion), or having random frequency, or random damping. We consider here a random mass which corresponds to an oscillator where the particles of the surrounding medium adhere to the oscillator for some (random) time after collision, thereby changing the oscillator mass. Such a model is appropriate to chemical and biological solutions as well as to some nano-technological devices. The first moment and stability conditions for white and dichotomous noise are analyzed.
Oscillator with Random Mass  [PDF]
Moshe Gitterman
World Journal of Mechanics (WJM) , 2012, DOI: 10.4236/wjm.2012.22013
Abstract: We consider an oscillator with a random mass for which the particles of the surrounding medium adhere to the oscillator for some random time after the collision (Brownian motion with adhesion). This is another form of a stochastic oscillator, different from oscillator usually studied that is subject to a random force or having random frequency or random damping. We calculated first two moments for different form of a random force, and studied different resonance phenomena (stochastic resonance, vibration resonance and “erratic” behavior) interposed between order and chaos.
Almost Stochastic Dominance and Efficient Investment Sets  [PDF]
Moshe Levy
American Journal of Operations Research (AJOR) , 2012, DOI: 10.4236/ajor.2012.23038
Abstract: A major drawback of Mean-Variance and Stochastic Dominance investment criteria is that they may fail to determine dominance even in situations when all “reasonable” decision-makers would clearly prefer one alternative over another. Leshno and Levy [1] suggest Almost Stochastic Dominance (ASD) as a remedy. This paper develops algorithms for deriving the ASD efficient sets. Empirical application reveals that the improvement to the efficient sets implied by ASD is substantial (64% reduction for FSD). Direct expected utility maximization shows that investment portfolios excluded from the ASD efficient set would not have been chosen by any investors with reasonable preferences.
Root Study: Why Is It behind Other Plant Studies?  [PDF]
Moshe Silberbush
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.42026
Abstract: Until the 1980s, root studies were typically conducted in nutrient solution, because of the technical difficulties of studying roots in their natural environment, soil. Recent innovations and the realization that there are gaps between the expected and actual performance of plant root systems have emphasized the need for more realistic solutions. This review analyzes the study of plant roots in view of developments in soil science, microbiology, botany and plant physiology, and recently the introduction of molecular biology and computerized imaging.
Oscillator Subject to Periodic and Random Forces  [PDF]
Moshe Gitterman
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.41015
Abstract:

We illustrate the influence of an external periodic force and noise on a physical system by the example of an oscillator. These two forces seem to be the reverse of each other, since the latter leads to disorder while the former works in an orderly fashion. Nevertheless, it is shown that they may influence a system in a similar way, sometime even substituting for one another. These examples serve to illustrate one of the main achievements of twentieth-century physics, which has established that deterministic and random phenomena complement rather than contradict each other.

Competitive Consumption of the Lake Kinneret (Israel) Plankton by Hypophthalmichthys molitrix and Sarotherodon galilaeus  [PDF]
Moshe Gophen
Open Journal of Ecology (OJE) , 2014, DOI: 10.4236/oje.2014.49043
Abstract:

An outdoor tank experiment was carried out for the assessing of the impacts of Sarotherodon galilaeus (Galilee Saint Peter’s Fish; Cichlidae) (SG) and Hypophthalmichthys molitriox (Silver Carp; Cyprinidae) (SC) on Lake Kinneret (Israel) plankton. In order to evaluate the interaction effect, the experiments were of replicated 2 × 2 factorial design: TG × SC. A lot of interaction effects were indicated showing that the effects of the two fishes were not independent and potentially competitors. SG suppressed most crustaceans and rotifers while increasing gross and net primary production and chlorophyll concentration. SC had less intense effects on zooplankton than SG. Although SC suppressed most crustaceans and rotifers, it had less interaction effects than SG. SC had no statistically significant effects on phytoplankton production or chlorophyll concentration. It is suggested that these experiments indicate that although the plankton community impacts of SG and SC do differ, both fishes utilize similar food resources in Lake Kinneret. Fingerlings of SG and SC are planted in Lake Kinneret annually aimed at the improvement of fishermen’s income and prevention of water quality deterioration. SC is known as efficient consumer of Microcystis. It is therefore recommended to limit SC introduction to periods when Microcystis is abundant.

Land-Use, Albedo and Air Temperature Changes in the Hula Valley (Israel) during 1946-2008  [PDF]
Moshe Gophen
Open Journal of Modern Hydrology (OJMH) , 2014, DOI: 10.4236/ojmh.2014.44010
Abstract: Long-Term (1946-2008) record of 35,580 measurements of daily mean air temperatures in three meteorological stations (Dan, Dafna, Kfar Blum) in the Hula Valley, within the drainage basin of Lake Kinneret (Israel) was statistically evaluated. Temperature decline after the drainage of the old Lake Hula and adjacent wetlands (1958) and increase from the mid 1980’s, after the implementation of the Hula Project aimed at continuous land green cover were verified. It was suggested that those regional climate changes were due to the change of Albedo levels: lower when land was water covered and higher after regional drainage followed by a decline when vegetation cover became intensive and continuous. Decline of Albedo levels led to higher air temperature and vice versa.
Nitrogen and Phosphorus Dynamics in the Shallow Lake Agmon (Hula Valley, Israel)  [PDF]
Moshe Gophen
Open Journal of Ecology (OJE) , 2015, DOI: 10.4236/oje.2015.53006
Abstract: Lake Agmon is a newly created shallow body of water which is a principle component of a reclamation project (Hula Project, HP) in the Hula Valley (Israel). The objectives of the HP are aimed at Lake Kinneret water quality protection, and improvements of the hydrological, and agricultural managements within the entire Hula Valley including the eco-touristic quality of the Agmon site. Thirteen years of research and monitoring, are summarized by focusing on nitrogen and phosphorus dynamics. It was found that the decay of submerged vegetation was the major P contribution to the Agmon effluents as dissolved (TDP) and plant debris particle forms. Peat soil gypsum dissolution contribute sulfate to drained waters and consequently to Agmon outflows. The Agmon system is operated as a nitrogen sink by de-nitrification and particulate sedimentation and contributor of plant mediated phosphorus. In the reconstructed Jordan flows into the Agmon, a stable composition of nutrients was indicated but those of the peat drainage and the lake effluents represented the higher level in winter and lower in summer. Anoxic conditions in the water column enhancing sulfate reduction are negligible and rarely observed. The Agmon merit to the reclamation process was achieved.
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