43,740 research outputs found
Photothermal characterization of encapsulant materials for photovoltaic modules
A photothermal test matrix and a low cost testing apparatus for encapsulant materials of photovoltaic modules were defined. Photothermal studies were conducted to screen and rank existing as well as future encapsulant candidate materials and/or material formulations in terms of their long term physiochemical stability under accelerated photothermal aging conditions. Photothermal characterization of six candidate pottant materials and six candidate outer cover materials were carried out. Principal products of photothermal degradation are identified. Certain critical properties are also monitored as a function of photothermal aging
Intrinsic electronic superconducting phases at 60 K and 90 K in double-layer YBaCuO
We study superconducting transition temperature () of oxygen-doped
double-layer high-temperature superconductors YBaCuO (0
1) as a function of the oxygen dopant concentration
() and planar hole-doping concentration (). We find that ,
while clearly influenced by the development of the chain ordering as seen in
the plot, lies on a universal curve originating at the
critical hole concentration () = 1/16 in the plot.
Our analysis suggests that the universal behavior of () can be
understood in terms of the competition and collaboration of chemical-phases and
electronic-phases that exist in the system. We conclude that the global
superconductivity behavior of YBaCuO as a function of
doping is electronically driven and dictated by pristine electronic phases at
magic doping numbers that follow the hierarchical order based on , such as
2 , 3 and 4 . We find that there are
at least two intrinsic electronic superconducting phases of = 60 K at 2
= 1/8 and = 90 K at 3 = 3/16.Comment: 4 pages, 2 figure
Phase diagram of the two-chain Hubbard model
We have calculated the charge gap and spin gap for the two-chain Hubbard
model as a function of the on-site Coulomb interaction and the interchain
hopping amplitude. We used the density matrix renormalization group method and
developed a method to calculate separately the gaps numerically for the
symmetric and antisymmetric modes with respect to the exchange of the chain
indices. We have found very different behaviors for the weak and strong
interaction cases. Our calculated phase diagram is compared to the one obtained
by Balents and Fisher using the weak coupling renormalization group technique.Comment: 4 pages, 6 figures, to appear in PR
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Development of portable microfading spectrometers for measurement of light sensitivity of materials
Microfading was originally designed for efficiently detecting extremely light-sensitive materials on objects in situ to determine the appropriate exhibition lighting conditions. By focusing an intense beam of light to a tiny submillimetre sized spot and simultaeously monitoring the colour change over time, the fading rate of the material can be measured without producing noticeable damage. The increased intensity of light allows rapid determination of light-fastness of materials. This paper examines an improved design of microfading spectrometer that is easy to assemble, compact, robust, capable of fully automatic acquisition of data with precision control of the fading time to produce higher precision measurements and to allow simultaneous monitoring of colour, spectral reflectance and other changes in real time. The effects of various parameters such as thickness and concentration of paint layer, the binding medium and substrate on the fading rates are examined for selected pigments and found that in certain cases substrates, binding media and thickness can affect the fading rate. Reciprocity in the context of microfading compared with realistic exhibition conditions is examined and found that it breaks down for some pigment
Hepatitis C in Haematological Patients
There is no consensus guideline concerning the management of chronic hepatitis C patients during chemotherapy, and immunosuppression. However, there are some suggestions in literature that hepatitis C viral load increases during chemotherapy and there is a risk of rebound immunity against hepatitis C after discontinuation of immunosuppression with a consequent liver injury. A close monitoring of liver function of these patients is prudent during treatment of haematological malignancy. Antiviral treatment is deferred after the completion of chemotherapy and recovery of patients' immunity to minimize the toxicity of treatment. A combination of pegylated interferon and ribavirin is the standard therapy in hepatitis C infected haematological patients
An Update in Management of Noncutaneous T-Cell Lymphomas
T-cell lymphoma is a heterogeneous group of diseases. Except for ALK positive anaplastic large cell lymphoma, T-cell lymphoma responds to conventional chemotherapy unfavourably, and most patients carry poor prognosis.
In recent years, efforts have been made to improve the outcome of T-cell lymphoma patients. Novel agents, high-dose therapy, and allogeneic stem cell transplantation are studied, and various results are reported in literature. This paper looks into the prognostication and treatment approach of different entities of noncutaneous T-cell lymphoma and would focus on the latest updates in its management
Multiphoton entanglement through a Bell multiport beam splitter
Multiphoton entanglement is an important resource for linear optics quantum
computing. Here we show that a wide range of highly entangled multiphoton
states, including W-states, can be prepared by interfering single photons
inside a Bell multiport beam splitter and using postselection. A successful
state preparation is indicated by the collection of one photon per output port.
An advantage of the Bell multiport beam splitter is that it redirects the
photons without changing their inner degrees of freedom. The described setup
can therefore be used to generate polarisation, time-bin and frequency
multiphoton entanglement, even when using only a single photon source.Comment: 8 pages, 2 figures, carefully revised version, references adde
The Effects of Long-time Strong Wave Condition on Breakwater Construction
AbstractIn this paper, long-time strong wave condition is defined according to the comparison between the China's Ocean and the Indian Ocean, as well the characteristic of long-time strong wave condition is described. Combined with practical works, the effects of long-time strong wave condition on breakwater construction are analyzed. Some specific construction measures, including placement of rock material, wave prediction and breakwater head protection during construction period, are introduced. Some valuable references are provided for similar projects in the future
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