5,088 research outputs found
Measuring thermal expansion of multiple specimens at high temperature
Furnace capable of heating 10 specimens to a uniform temperature simultaneously, aids in the measuring of the thermal expansion of each specimen. The specimens are measured with a telescope unit consisting of two microtelescopes. Overall accuracy of the system is estimated to be plus or minus 2 percent at 2000 degrees C
Ab-initio calculation of phonon dispersion curves: accelerating q point convergence
We present a scheme for the improved description of the long-range
interatomic force constants in a more accurate way than the procedure which is
commonly used within plane-wave based density-functional perturbation-theory
calculations. Our scheme is based on the inclusion of a q point grid which is
denser in a restricted area around the center of the Brillouin Zone than in the
remaining parts, even though the method is not limited to an area around Gamma.
We have tested the validity of our procedure in the case of high-pressure
phases of bulk silicon considering the bct and sh structure.Comment: 7 pages, 6 figures, draft version, to be submitted soo
On the robust determination of eigenmodes in 2D stratified wave guiding systems with Berenger-type PML's.
A contour integration method is presented to determine the eigenmodes in a layered structure closed with PML layers at the boundaries of the computational window. Improvements are provided to ensure the accuracy of contour integration and to assure that all the encircled eigenvalues are determined. Numerical examples are presented to test the accuracy of the method
Az internet hatása az orvos–beteg viszonyra
Absztrakt
Az internet kikerülhetetlen tényezővé vált az egészségügyben és az orvos–beteg
kapcsolatban. Hatását két elméleti keretben érdemes vizsgálni: az orvosi
hivatásra gyakorolt hatás mellett a döntéshozatali mechanizmusokkal való
kölcsönhatás elemzĂ©se segĂt Ă©rtelmezni a jelensĂ©get, hogy a páciensek az
interneten informálódnak betegségükről, a lehetséges gyógymódról vagy az
orvosról. Az orvosok többsége idegenkedik attól, hogy a páciensek az internetet
is felhasználják gyógyulásuk érdekében, és aggályaikban nem csupán a betegek,
hanem saját státuszuk, idejük féltése is megjelenik. Ez a félelem azonban nem
indokolt, még akkor sem, ha a napi rutinba nehezen illeszthető be az
„internetbeteg”. Az internet nemcsak szükséges rosszként értelmezhető, hanem
hatĂ©kony kommunikáciĂłs technikákkal az orvos a maga elĹ‘nyĂ©re fordĂthatja a
betegek internetezési szokásait. Orv. Hetil., 2016, 157(17),
680–684
Electrical conductivity of multi-walled carbon nanotubes-SU8 epoxy composites
We have characterized the electrical conductivity of the composite which
consists of multi-walled carbon nanotubes dispersed in SU8 epoxy resin.
Depending on the processing conditions of the epoxy (ranging from
non-polymerized to cross-linked) we obtained tunneling and percolating-like
regimes of the electrical conductivity of the composites. We interpret the
observed qualitative change of the conductivity behavior in terms of reduced
separation between the nanotubes induced by polymerization of the epoxy matrix.Comment: 4 pages, 3 figure
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