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排序方式: 共有125条查询结果,搜索用时 15 毫秒
121.
Emil D. Attanasi 《Natural resources forum》1991,15(3):190-201
Gas conversion to liquefied gas (LNG) and transport by LNG tankers is one option for meeting expanding gas consumption and for gas traded internationally. This paper examines the impact of the traditional gas contract provisions of indefinite pricing, market out price ceilings, and take-or-pay requirements on the profitability of LNG projects in the context of markets characterized by price and quantity uncertainty. Simulation experiments are used to examine and calibrate the effects of those provisions. The results provide guidance to operators, host countries and purchasers in structuring such contracts. The paper also assesses prospects of future expansion of world LNG capacity. 相似文献
122.
123.
During social evolution, the ovary size of reproductively specialized honey bee queens has dramatically increased while their
workers have evolved much smaller ovaries. However, worker division of labor and reproductive competition under queenless
conditions are influenced by worker ovary size. Little comparative information on ovary size exists in the different honey
bee species. Here, we report ovariole numbers of freshly dissected workers from six Apis species from two locations in Southeast Asia. The average number of worker ovarioles differs significantly among species.
It is strongly correlated with the average mating number of queens, irrespective of body size. Apis dorsata, in particular, is characterized by numerous matings and very large worker ovaries. The relation between queen mating number
and ovary size across the six species suggests that individual selection via reproductive competition plays a role in worker
ovary size evolution. This indicates that genetic diversity, generated by multiple mating, may bear a fitness cost at the
colony level. 相似文献
124.
Vishwakarma Dinesh Kumar Ali Rawshan Bhat Shakeel Ahmad Elbeltagi Ahmed Kushwaha Nand Lal Kumar Rohitashw Rajput Jitendra Heddam Salim Kuriqi Alban 《Environmental science and pollution research international》2022,29(55):83321-83346
Environmental Science and Pollution Research - Dams significantly impact river hydrology by changing the timing, size, and frequency of low and high flows, resulting in a hydrologic regime that... 相似文献
125.
Bheel Naraindas Khoso Salim Baloch Mereen Hussain Benjeddou Omrane Alwetaishi Mamdooh 《Environmental science and pollution research international》2022,29(35):52399-52411
Environmental Science and Pollution Research - Concrete is widely used as a building material all over the world, and its use is increasing the demand of cement and sand in the construction... 相似文献