4,453 research outputs found
Method of producing high T(subc) superconducting NBN films
Thin films of niobium nitride with high superconducting temperature (T sub c) of 15.7 K are deposited on substrates held at room temperature (approx 90 C) by heat sink throughout the sputtering process. Films deposited at P sub Ar 12.9 + or - 0.2 mTorr exhibit higher T sub c with increasing P sub N2,I with the highest T sub c achieved at P sub n2,I= 3.7 + or - 0.2 mTorr and total sputtering pressure P sub tot = 16.6 + or - 0.4. Further increase of N2 injection starts decreasing T sub c
The Deuteron Spin Structure Functions in the Bethe-Salpeter Approach and the Extraction of the Neutron Structure Function
The nuclear effects in the spin-dependent structure functions and
are calculated in the relativistic approach based on the Bethe-Salpeter
equation with a realistic meson-exchange potential.
The results of calculations are compared with the non-relativistic
calculations. The problem of extraction of the neutron spin structure function,
, from the deuteron data is discussed.Comment: (Talk given at the SPIN'94 International Symposium, September 15-22,
1994, Bloomington, Indiana), 6 pages, 5 figures, Preprint Alberta Thy 29-9
Building stock dynamics and its impacts on materials and energy demand in China
China hosts a large amount of building stocks, which is nearly 50 billion square meters. Moreover, annual new construction is growing fast, representing half of the world's total. The trend is expected to continue through the year 2050. Impressive demand for new residential and commercial construction, relative shorter average building lifetime, and higher material intensities have driven massive domestic production of energy intensive building materials such as cement and steel. This paper developed a bottom-up building stock turnover model to project the growths, retrofits and retirements of China's residential and commercial building floor space from 2010 to 2050. It also applied typical material intensities and energy intensities to estimate building materials demand and energy consumed to produce these building materials. By conducting scenario analyses of building lifetime, it identified significant potentials of building materials and energy demand conservation. This study underscored the importance of addressing building material efficiency, improving building lifetime and quality, and promoting compact urban development to reduce energy and environment consequences in China
Varietal problem with special reference to its physiological and biochemical aspects
This article does not have an abstract
Executive Information System Penjualan Bahan Kimia
Kebutuhan informasi sekarang ini menjadi kebutuhan mutlak bagi suatu organisasi atau Perusahaan untuk memenangkan sebuah persaingan. Dimana informasi digunakan sebagai penunjang pembuat keputusan, sehingga dibutuhkan penyampaian informasi yang akurat dan cepat dalam mendapatkannya agar tidak kalah dari pesaingnya. Informasi tersebut berisi kondisi yang terjadi di dalam maupun di luar Perusahaan yang selanjutnya akan digunakan sebagai dasar untuk perencanaan strategis dan program kerja. Seiring dengan berkembangnya kebutuhan informasi khususnya untuk para executive guna pengambilan keputusan dan untuk mengetahui kondisi kinerja Perusahaan, maka berkembanglah sebuah sistem informasi yang disebut Executive Information System (EIS). Dengan EIS informasi dapat ditampilkan dalam bentuk secara ringkas dan menampilkan data sesuai dengan kebutuhan sehingga mempermudah seorang eksekutif dalam pengontrolan setiap saat. Proses penjualan yang berjalan saat ini masih menggunakan sistem yang manual yaitu masih menggunakan proses pencatatan data sehingga membutuhkan waktu yang lama untuk pembuatan laporan dan laporan yang dihasilkan datanya belum tentu akurat. Dengan permasalahan diatas maka dibutuhkan suatu sistem yang dapat membantu pekerjaan pegawai sehingga laporan yang dihasilkan bisa tepat pada waktunya dan data yang dihasilkan lebih akurat
Electronic structure and chemical bonding of 3d-metal dimers ScX, X=Sc-Zn
The electronic and geometrical structures of the ground and excited states of the homonuclear Sc2, mixed ScTi, ScV, ScCr, ScMn, ScFe, ScCo, ScNi, ScCu, and ScZn 3d-metal dimers and their anions have been calculated using the density functional theory with generalized gradient approximation for the exchange-correlation potential. The ground states of the neutral dimers are found to be 5Σ−u (Sc2), 6Σ+ (ScTi), 7Σ+ (ScV), 4Σ+ (ScCr), 3Σ+ (ScMn), 2Δ(ScFe), 1Σ+ (ScCo), 2Σ+ (ScNi), 3Δ(ScCu), and 4Σ+ (ScZn). A natural bond analysis reveals an antiferrimagnetic spin coupling in the ground states of ScCr, ScMn, and ScFe. This is due to the electron transfer from Sc to the opposite atom and specific bond formations. While each dimer has a unique chemical bonding pattern, most curious is the localization of two 4s electrons at both atomic sites in the ground 5Σ−u state of Sc2, which leads to formation of two lone pairs and the bonding scheme: (3d+3d)3α(4s+4s)1β. No appreciable sd hybridization is found for the ground states of the ScX dimers except for ScNi. Even though the electron affinities of the ScX dimers are relatively low and do not exceed 1 eV, each ScX− (except ScCo−) possesses at least two states stable towards detachment of an extra electron
Studies in the anatomy of sugarcane stalk. III. Fission and pseudo-fission
This article does not have an abstract
Binary black hole merger gravitational waves and recoil in the large mass ratio limit
Spectacular breakthroughs in numerical relativity now make it possible to
compute spacetime dynamics in almost complete generality, allowing us to model
the coalescence and merger of binary black holes with essentially no
approximations. The primary limitation of these calculations is now
computational. In particular, it is difficult to model systems with large mass
ratio and large spins, since one must accurately resolve the multiple
lengthscales which play a role in such systems. Perturbation theory can play an
important role in extending the reach of computational modeling for binary
systems. In this paper, we present first results of a code which allows us to
model the gravitational waves generated by the inspiral, merger, and ringdown
of a binary system in which one member of the binary is much more massive than
the other. This allows us to accurately calibrate binary dynamics in the large
mass ratio regime. We focus in this analysis on the recoil imparted to the
merged remnant by these waves. We closely examine the "antikick", an anti-phase
cancellation of the recoil arising from the plunge and ringdown waves,
described in detail by Schnittman et al. We find that, for orbits aligned with
the black hole spin, the antikick grows as a function of spin. The total recoil
is smallest for prograde coalescence into a rapidly rotating black hole, and
largest for retrograde coalescence. Amusingly, this completely reverses the
predicted trend for kick versus spin from analyses that only include inspiral
information.Comment: 15 pages, 5 figures. Submitted to Phys. Rev.
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