ZnO nanoneedle arrays were grown vertically on a fluorine-doped tin oxide-coated glass by hydrothermal method at a relatively low temperature. A self-powered photoelectrochemical cell-type UV detector was fabricated using the ZnO nanoneedles as the active photoanode and H2O as the electrolyte. This solid-liquid heterojunction offers an enlarged ZnO/water contact area and a direct pathway for el...

drought, ultraviolet radiation and atmospheric co2 are some three environmental factors that seriously affect future food security. the objective followed in the present research was to study the effect of two levels of carbon dioxide (400 and 900 ppm), ultraviolet radiation (uv a, b and c with intensities of 18, 25 and 40 microw.cm-2 respectively) and water deficit (%100 and %60 of field capac...

Future prospects for solar spectroscopy missions operating in the extreme ultraviolet (EUV) and soft X-ray (SXR) wavelength ranges, 1.2–1,600 Å, are discussed. NASA is major funder of Solar Physics missions, brief summaries opportunities mission development under given. Upcoming from other nations also described. The methods observing Sun two ranges summarized with a discussion spectrometer typ...

Photodetector (PD) devices based on carbon nanotube/n-silicon heterojunction (NSH) have been realized, with a linear response in large optical power range, proving competitive performances respect to recent nanostructure-based detector and those currently available the market. The core of these is thin semi-transparent conductive single-walled nanotubes film multitask role: junction element, li...

We report on characterization of a set of AlGaN/GaN multiple-quantum-well (MQW) photodetectors. The model structure used in the calculation is the p–i–n heterojunction with 20 AlGaN/GaN MQW structures in i-region. The MQW structures have 2nm GaN quantum well width and 15nm AlxGa1 xN barrier width. The cutoff wavelength of the MQW photodetectors can be tuned by adjusting the well width and barri...

Ptychography is a lensless imaging technology that validated from hard X-rays to terahertz spectral range. It most attractive for extreme ultraviolet (EUV) and as optical elements are expensive often not available. Typically, the set up involves coherently illuminated object directs scattered radiation normally detector which parallel plane. Computer processing of diffraction patterns obtained ...

We are developing low-temperature detectors for optical, ultraviolet, X-ray, and gamma-ray spectroscopy, and for biomolecular mass spectrometry. We present here a survey of our recent work in developing these detectors and some of the first results in applying these detectors for materials analysis and biomolecular mass spectrometry. We have measured thin-film Nb/Al/Al2O3/Al/Nb superconducting ...

A new type of optical rotation (OR) detector based on the phase retardation of the first-order diffraction beam has been constructed. The proposed detector responded to only OR properties by eliminating the circular dichroism (CD) effect. Thus, it could measure the optical rotatory dispersion curves in the Cotton band. Although the optical system requires the incident beam in which the phase re...

background: cobalamin deficiency and peripheral neuropathy (pn) are commonly seen in hiv-infected adults. the level of urine methylmalonic acid (umma), a reliable indicator of tissue cobalamin status, was determined in hiv infected subjects with and without pn to establish this association. methods: one hundred and ninety-eight (198) consenting hiv infected subjects with and without pn were rec...