نتایج جستجو برای: porters forces
تعداد نتایج: 89765 فیلتر نتایج به سال:
For the first time, we have a plausible and complete accounting of matter and energy in the Universe. Expressed a fraction of the critical density it goes like this: neutrinos, between 0. to the critical density (within the errors). This accounting is consistent with the inflationary prediction of a flat Universe and defines three dark-matter problems: Where are the dark baryons? What is the no...
We show that dark matter could be made of massive gauge bosons whose stability doesn’t require to impose by hand any discrete or global symmetry. Stability of gauge bosons can be guaranteed by the custodial symmetry associated to the gauge symmetry and particle content of the model. The particle content we consider to this end is based on a hidden sector made of a vector multiplet associated to...
This study was conducted in a general psychiatric unit of a zonal hospital of armed forces. 50 consecutive individuals, referred for psychiatric evaluation and sent back with diagnosis of Psychiatric Investigation NAD from 01 Jan. 1998 to 31 Dec. 1999, constituting 21.4% of total 234 first psychiatric referrals were included with an aim to study the sociodemographic and service profile of these...
The scenario was aggravated by the entry of western capitalism. From the beginning of the nineteenth century, the import of goods from abroad, especially opium, had risen steeply compared to exports. Thus the balance of trade went against China. The import hike was met by the export of large quantities of silver from China to other countries. Before the beginning of the nineteenth century, tael...
The genomes of eleven Gram-positive bacteria that are important for human health and the food industry, nine low G+C lactic acid bacteria and two high G+C Gram-positive organisms, were analyzed for their complement of genes encoding transport proteins. Thirteen to 18% of their genes encode transport proteins, larger percentages than observed for most other bacteria. All of these bacteria posses...
Fundamental understanding of the goaf gas distribution in a gassy coal mine is necessary for developing effective goaf gas drainage strategies in the longwall coal mine. The goaf gas was subjected to the surface and body forces that were classified depending upon whether they acted on the surface area or the volume of the gas element. Of these forces, the body forces were more predominant in di...
One of the most important goals of contemporary cosmology is to unreveal the properties of dark energy. This energy form is thought to be responsible for the observed accelerating expansion of the present day universe. There are several methods used to study the properties of dark energy. The important ones make use of the anisotropies in the Cosmic Microwave Background Radiation (CMB), the evo...
This entry emphasises the fact that, considered as a whole, models of regional development afford analyses of a range of centripetal and centrifugal forces, and that relative development depends on the relative weight of these two sets of forces. It also emphasises the fact that regional development is dialectical/cumulative in character as consequences are causes and causes are consequences: w...
There are several indications that the (long-term) memory of electronic government is in danger and that this decline in organizational memory may have important negative effects on accountability. Case study research in the Netherlands, however, highlights the positive effects of the use of information and communication technologies for parliamentary and legal accountability. Although technolo...
Massive gravity previously constructed as the spin-2 quantum gauge theory is studied in the classical limit. The vector graviton field v which does not decouple in the limit of vanishing graviton mass gives rise to a modification of general relativity. The modified Schwarzschild solution contains a contribution from the v-field which can be interpreted as the dark matter mass density. ∗e-mail: ...
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