Products of carbon burning at constant temperature     

O. A. Bessonov  A. D. Kudryashov  É. V. Érgma 《Astrophysics》1978,14(1):91-96

  相似文献   

Existence of the solution of Szebehely's equation in three dimensions using a two-parametric family of orbits     

F. Váradi  B. Érdi 《Celestial Mechanics and Dynamical Astronomy》1983,30(4):395-405

The three-dimensional inverse problem is investigated. A quasi-linear system of partial differential equations is derived for the determination of the potential. The solution of this system is studied by a method of differential geometry. A necessary condition for the solution is derived and the determination of the potential is reduced to algebraic equations written in vectorial form. A few examples are also given.  相似文献   

Long periodic perturbations of Trojan asteroids     

B. Érdi 《Celestial Mechanics and Dynamical Astronomy》1987,43(1-4):303-308

The motion of the Trojan asteroids is studied in the elliptic restricted three-body problem of the Sun-Jupiter-asteroid system. Long periodic perturbations of the orbital elements are discussed. Relations between dynamical parameters are considered and comparisons are made with Bien's and Schubart's results.  相似文献   

Application of Land Magnetic and Geoelectrical Techniques for Delineating Groundwater Aquifer: Case Study in East Oweinat,Western Desert,Egypt     

Araffa  Sultan Awad Sultan  Bedair  Sayed 《Natural Resources Research》2021,30(6):4219-4233

Natural Resources Research - Two geophysical tools were used to delineate the configuration of the Nubian sandstone aquifer in the study area. Three hundred magnetic points were measured and...  相似文献   

Monthly variations of net heat flux at the air‐sea interface in coastal waters near Jeddah,Red Sea     

F. Ahmad  S.A.R. Sultan  M.O. Moammar 《大气与海洋》2013,51(2):406-413

Abstract

Based on 16 years of oceanographic and meteorological data the monthly variations of the net heat flux at the air‐sea interface in coastal waters near Jeddah show that the sea gains an average of about 14 ±2 W m^?2 from April to October and loses about 79± 4W m^?2from November to March. The loss of heat during the winter months is not compensated by the gain during the summer months and therefore leads to an annual average deficit of 25 ± 3 Wm^?2. The gain during summer may not favour the formation of a strong seasonal thermocline.  相似文献   

Risk management tools for sustainable fisheries management under changing climate: a sea cucumber example     

Éva E. Plagányi  Timothy D. Skewes  Natalie A. Dowling  Malcolm Haddon 《Climatic change》2013,119(1):181-197

Sustainable fisheries management into the future will require both understanding of and adaptation to climate change. A risk management approach is appropriate due to uncertainty in climate projections and the responses of target species. Management strategy evaluation (MSE) can underpin and support effective risk management. Climate change impacts are likely to differ by species and spatially. We use a spatial MSE applied to a multi-species data-poor sea cucumber/béche-de-mer fishery to demonstrate the utility of MSE to test the performance of alternative harvest strategies in meeting fishery objectives; this includes the ability to manage through climate variability and change, and meeting management objectives pertaining to resource status and fishery economic performance. The impacts of fishing relative to the impacts of climate change are distinguished by comparing future projection distributions relative to equivalent no-fishing no-climate-change trials. The 8 modelled species exhibit different responses to environmental variability and have different economic value. Status quo management would result in half the species falling below target levels, moderate risks of overall and local depletion, and significant changes in species composition. The three simple strategies with no monitoring (spatial rotation, closed areas, multi-species composition) were all successful in reducing these risks, but with fairly substantial decreases in the average profit. Higher profits (for the same risk levels) could only be achieved with strategies that included monitoring and hence adaptive management. Spatial management approaches based on adaptive feedback performed best overall.  相似文献