نتایج جستجو برای: drastic method
تعداد نتایج: 1639165 فیلتر نتایج به سال:
Long-run technological progress is cyclical because drastic innovations that introduce new technological opportunity are only profitable at times when repeated incremental innovation has nearly exhausted existing technological opportunity and driven entrepreneurial profit and income growth towards zero. The article presents a ’technological opportunity model’ where endogenous drastic and increm...
In my reply I present a re-analysis of the data of the Smithsonian Astrophysical Observatory (SAO). For this, a new data reduction method is introduced, allowing a drastic lowering of data scatter, so that the time series of the reduced data clearly shows the ≈ 1% variation of the terrestric solar irradiance in parallel with solar activity. The implications are discussed.
Conclusions In the proportional hazards model the effect of a covariate is assumed to be time-invariant. In this paper a graphical method based on a linear regression model (LRM) is used to test whether this assumption is realistic. The variation in the effect of a covariate is plotted against time. The slope of this plot indicates the nature of the influence of a covariate over time. A covaria...
Groundwater protection against anthropogenic sources, including the exploitation and use of groundwater release wastes into soil environment, changes in land cover, process recharge is paramount importance for protecting human health by securing clean drinking water production. The identification a contamination risk zone has been found to be necessary useful approach managing this valuable res...
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abstract part one: the electrode oxidation potentials of a series of eighteen n-hydroxy compounds in aqueous solution were calculated based on a proper thermodynamic cycle. the dft method at the level of b3lyp-6-31g(d,p) was used to calculate the gas-phase free energy differences ,and the polarizable continuum model (pcm) was applied to describe the solvent and its interaction with n-hydroxy ...
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