1,721,237 research outputs found
Microlens fabrication by selective oxidation of composition-graded digital alloy AlGaAs
No full textWe have fabricated refractive microlenses using selective oxidation of composition-graded digital alloy AlGaAs. The chirped short period superlattice of GaAs-AIAs was used to grade the composition of AlGaAs along the growth direction for a reproducible and controllable composition and oxidation profile. The oxidized profile of linearly composition-graded digital alloy AlGaAs shows a circular convex lens shape. The focused spot pattern of the beam at the focal point of the fabricated circular buried microlens reveals the strong focusing function of the microlens. Circular buried microlenses with mesa diameter of 20 mu m exhibited focal length of 28-33 mu m and a focused spot diameter of 4.0-6.4 mu m, which are varied by oxidation time.
Presumption of Primary Site of Neck Lymph Node Metastases with Fine Needle Aspiration Cytology
No full textDISSOCIATION-ENERGY AND PHOTOCHEMISTRY OF NO3
No full textThe photodissociation of NO3 was studied using the method of molecular beam photofragmentation translational spectroscopy. The existence of two photodissociation channels was confirmed under collision-free conditions. At excitation energies below D0(O-NO2) for internally cold NO3, we observe a large quantum yield (0.70 +/- 0.10 at 588 nm) for a concerted three-center rearrangement resulting in NO(2PI) + O2 (3SIGMA(g)-,1DELTA). The quantum yield for the NO + O2 channel decreased sharply at wavelengths shorter than 587 nm, falling to <0.01 at 583 nm, while the NO2 + O(3p) quantum yield increased to >0.99. On the basis of this wavelength dependence and the product translational energy distributions, we conclude that the wavelength threshold for NO3(0,0,0,0) --> NO2(0,0,0) + O(P-3(2)) is 587 +/- 3 nm, i.e. D0(O-NO2) = 48.69 +/- 0.25 kcal/mol. From the enthalpies of formation of O(P-3(2)) and NO2 (2A1), we calculate DELTAH(f)-degrees (NO3) = 18.87 +/- 0.33 kcal/mol at 0 K and DELTAH(f)-degrees (NO3) = 17.62 +/- 0.33 kcal/mol at 298 K. This is 2.23 kcal/mol higher than the most recent thermochemical value but is consistent with a value calculated indirectly using the most recent values for the electron affinity (EA) of NO3 and DELTAH(f)-degrees-(NO3-). From the wavelength dependence and translational energy distributions for NO3 --> NO + O2, the potential energy barrier for NO3(2A'2) --> NO(2PI) + O2 (2SIGMA(g)-) was found to be 47.3 +/- 0.8 kcal/mol
Value of circulating adhesion molecules in the assessment of cardiac allograft rejection.
No full textThe differentiation of mesenchymal stem cells by mechanical stress or/and co-culture system.
No full textPrevalence, awareness, efficiency of control, and target organ damage in Taiwanese patients with hypertension
No full textCoronary artery fistula presented as infective endocarditis with pulmonary septic emboli.
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Cancer-Associated Fibroblasts: Epigenetic Regulation and Therapeutic Intervention in Breast Cancer
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