منابع مشابه
Ju l 2 00 1 E ∞ - STRUCTURES AND DIFFERENTIALS OF THE ADAMS SPECTRAL SEQUENCE
The Adams spectral sequence was invented by J.F.Adams [1] almost fifty years ago for calculations of stable homotopy groups of topological spaces and in particular of spheres. The calculation of differentials of this spectral sequence is one of the most difficult problem of Algebraic Topology. Here we consider an approach to solve this problem in the case of Z/2 coefficients and find inductive ...
متن کاملFinal Comments on Model Validation Report, E. Adams, July 2006
Sorption kinetics The model assumes that three chemical phases of PCBs are in equilibrium. As EPA points out, this is a common modeling assumption, but I believe it is only reasonable within a stationary sediment bed, and not within the water column during sediment resuspension. Following Wu and Gschwend (1986), and focusing only on sorption and desorption among two phases (sorbed PCB with conc...
متن کاملAdams, H
Experiments were performed to determine the effect of community composition on system function (bacterial production) in arctic Alaska. In this system bacterial production is controlled by: community, temperature, nutrients, and carbon source. Lake inlet and outlet communities in these experiments were different in composition, based on PCR-DGGE fingerprinting of 16S rDNA. For both communities,...
متن کاملپارامتر نقض لورنتس d_μν در پراکندگی e^-+e^+→ l^-+l^+
در این پایان نامه در ابتدا مروری بر مفاهیم اولیه ی تقارنها و قوانین پایستگی خواهیم داشت و به طور خاص تقارنهای لورنتس و ?????? که تقارن های دقیقِ طبیعت هستند را معرفی می کنیم. نقض تقارن های لورنتس و ?????? می تواند به صورت نقضِ خودبخودی در تئوری های موجود جا داده شود. از این رو به مطالعه ی شکست خودبخودی این تقارن ها می پردازیم. در ادامه با انواع تبدیلات لورنتس آشنا می شویم. در گام بعدی به توصیف مد...
15 صفحه اولY E a R S O F E X C E L L E N C E
The first self-assembled InAs quantum dash lasers grown by molecular beam epitaxy on InP (001) substrates are reported. Pulsed room-temperature operation demonstrates wavelengths from 1.60 to 1.66 μm for one-, three-, and five-stack designs, a threshold current density as low as 410 A/cm2 for single-stack uncoated lasers, and a distinctly quantum-wire-like dependence of the threshold current on...
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ژورنال
عنوان ژورنال: Nature
سال: 1945
ISSN: 0028-0836,1476-4687
DOI: 10.1038/156470b0