2,306 research outputs found
Afforestation for reduction of NOx concentration in Lanzhou China
Environment International, 34 (5), 688-697The article of record as published may be found at http://dx.doi.org/10.1016/j.envint.2007.12.01
Exact solution of Schrodinger equation for Pseudoharmonic potential
Exact solution of Schrodinger equation for the pseudoharmonic potential is
obtained for an arbitrary angular momentum. The energy eigenvalues and
corresponding eigenfunctions are calculated by Nikiforov-Uvarov method.
Wavefunctions are expressed in terms of Jacobi polynomials. The energy
eigenvalues are calculated numerically for some values of l and n with n<5 for
some diatomic molecules.Comment: 10 page
Impurity state in Haldane gap for S=1 Heisenberg antiferromagnetic chain with bond doping
Using a new impurity density matrix renormalization group scheme, we
establish a reliable picture of how the low lying energy levels of a
Heisenberg antiferromagnetic chain change {\it quantitatively} upon bond
doping. A new impurity state gradually occurs in the Haldane gap as ,
while it appears only if with as . The
system is non-perturbative as . This explains the
appearance of a new state in the Haldane gap in a recent experiment on
YCaBaNiO [J.F. DiTusa, et al., Phys. Rev. Lett. 73 1857(1994)].Comment: 4 pages of uuencoded gzip'd postscrip
Experiential design landscapes as a design tool for market research of disruptive intelligent systems
Our society is faced with a number of major challenges. As the most significant of these include the aging society, the related challenge of increasing cost of healthcare, and attaining a sustainable level of energy consumption, in light of the available resources. In many cases these major challenges cannot be solved by incremental solutions. Disruptive innovative solutions are often needed to create sustainable growth. Looking, for example, at the field of public health, we are currently faced with a situation where, if no fundamental change takes place, an increasing number of people will have to rely on increasingly expensive healthcare paid by a decreasing number of people. Introducing new propositions that will lead to a structurally more sustainable society is not easy; in most cases changes are required in societal processes that involve a wide range of stakeholders. Due to a high degree of structural uncertainty, the outcomes of such changes are by no means easily predictable. For industry it is therefore very difficult to introduce these disruptive innovations without a solid basis of evidence. This paper describes the newly developed method of Experiential Design Landscapes (EDL): a method where an infrastructure is created that, on one hand, stimulates the creation of new, disruptive, propositions in a semi-open environment where new these new propositions are used as agents to facilitate new and emerging behaviour and that, in parallel, enables the detailed analysis of the emerging data patterns as a source of inspiration for the design of future services and products. This paper describes both the methodological basis as well as the actual experiences of EDLs using a real-life test case
Neutrino mixing in matter
Three-neutrino mixing in matter is studied through a set of evolution
equations which are based on a rephasing invariant parametrization. Making use
of the known properties of measured neutrino parameters, analytic, approximate,
solutions are obtained. Their accuracy is confirmed by comparison with
numerical integration of these equations. The results, when expressed in the
elements squared of the mixing matrix, exhibit striking patterns as the matter
density varies.Comment: Revised, 5 pages, 3 figures, references added
Effect of bilayer coupling on tunneling conductance of double-layer high T_c cuprates
Physical effects of bilayer coupling on the tunneling spectroscopy of high
T cuprates are investigated. The bilayer coupling separates the bonding
and antibonding bands and leads to a splitting of the coherence peaks in the
tunneling differential conductance. However, the coherence peak of the bonding
band is strongly suppressed and broadened by the particle-hole asymmetry in the
density of states and finite quasiparticle life-time, and is difficult to
resolve by experiments. This gives a qualitative account why the bilayer
splitting of the coherence peaks was not clearly observed in tunneling
measurements of double-layer high-T oxides.Comment: 4 pages, 3 figures, to be published in PR
Synthesis of a novel monomer “DDTU-IDI” for the development of low-shrinkage dental resin composites
ObjectiveThe current dental resin composites often suffer from polymerization shrinkage, which can lead to microleakage and potentially result in recurring tooth decay. This study presents the synthesis of a novel monomer, (3,9-diethyl-1,5,7,11-tetraoxaspiro[5,5]undecane-3,9-diyl)bis(methylene) bis((2-(3-(prop-1-en-2-yl)phenyl)propan-2-yl)carbamate) (DDTU-IDI), and evaluates its effect in the formulation of low-shrinkage dental resin composites.MethodsDDTU-IDI was synthesized through a two-step reaction route, with the initial synthesis of the required raw material monomer 3,9-diethyl-3,9-dihydroxymethyl-1,5,7,11-tetraoxaspiro-[5,5] undecane (DDTU). The structures were confirmed using Fourier-transform infrared (FT-IR) spectroscopy and hydrogen nuclear magnetic resonance (1HNMR) spectroscopy. Subsequently, DDTU-IDI was incorporated into Bis-GMA-based composites at varying weight percentages (5, 10, 15, and 20 wt%). The polymerization reaction, degree of conversion, polymerization shrinkage, mechanical properties, physicochemical properties and biocompatibility of the low-shrinkage composites were thoroughly evaluated. Furthermore, the mechanical properties were assessed after a thermal cycling test with 10,000 cycles to determine the stability.ResultsThe addition of DDTU-IDI at 10, 15, and 20 wt% significantly reduced the polymerization volumetric shrinkage of the experimental resin composites, without compromising the degree of conversion, mechanical and physicochemical properties. Remarkably, at a monomer content of 20 wt%, the polymerization shrinkage was reduced to 1.83 ± 0.53%. Composites containing 10, 15, and 20 wt% DDTU-IDI exhibited lower water sorption and higher contact angle. Following thermal cycling, the composites exhibited no significant decrease in mechanical properties, except for the flexural properties.Significance. DDTU-IDI has favorable potential as a component which could produce volume expansion and increase rigidity in the development of low-shrinkage dental resin composites. The development of low-shrinkage composites containing DDTU-IDI appears to be a promising strategy for reducing polymerization shrinkage, thereby potentially enhancing the longevity of dental restorations
Topological Black Holes in Gauss-Bonnet Gravity with conformally invariant Maxwell source
In this paper, we present a class of rotating solutions in Gauss--Bonnet
gravity in the presence of cosmological constant and conformally invariant
Maxwell field and study the effects of the nonlinearity of the Maxwell source
on the properties of the spacetimes. These solutions may be interpret as black
brane solutions with inner and outer event horizons provide that the mass
parameter is greater than an extremal value , an extreme black
brane if and a naked singularity otherwise. We investigate the
conserved and thermodynamics quantities for asymptotically flat and
asymptotically with flat horizon. We also show that the conserved and
thermodynamic quantities of these solutions satisfy the first law of
thermodynamics.Comment: 17 pages, 4 figures, some references adde
The Period of Composition of Kierkegaard's Published Works
The Period of Composition of Kierkegaard's Published Work
Thermodynamics of Rotating Black Branes in Gauss-Bonnet-nonlinear Maxwell Gravity
We consider the Gauss-Bonnet gravity in the presence of a new class of
nonlinear electromagnetic field, namely, power Maxwell invariant. By use of a
suitable transformation, we obtain a class of real rotating solutions with
rotation parameters and investigate some properties of the solutions such as
existence of singularity(ies) and asymptotic behavior of them. Also, we
calculate the finite action, thermodynamic and conserved quantities of the
solutions and using the the Smarr-type formula to check the first law of
thermodynamics.Comment: 15 page
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