نتایج جستجو برای: ultraviolet a
تعداد نتایج: 13444736 فیلتر نتایج به سال:
Malignant melanoma of the skin (CMM) is associated with ultraviolet radiation exposure, but the mechanisms and even the wavelengths responsible are unclear. Here we use a mammalian model to investigate melanoma formed in response to precise spectrally defined ultraviolet wavelengths and biologically relevant doses. We show that melanoma induction by ultraviolet A (320-400 nm) requires the prese...
Ultraviolet (UV) A1 phototherapy selectively uses longer UVA1 wavelengths (340−400 nm), and does not include the shorter UVA2 (320−340 nm) or UVB (290−320 that cause erythema reactions. Several studies in which a metal-halide lamp was used as light source demonstrated efficacy of for various diseases T cells infiltrate dermis induce excessive collagen accumulation, such atopic dermatitis [[1]Mo...
The characterization of the time structure of ultrafast photon pulses in the extreme-ultraviolet (EUV) and soft X-ray spectral ranges is of high relevance for a number of scientific applications and photon diagnostics. Such measurements can be performed following different strategies and often require large setups and rather high pulse energies. Here, high-quality measurements carried out by ex...
The advantages and disadvantages of sources emitting either a continuous or a discontinuous spectrum are considered in connection with the use of such lamps as a standard of ultraviolet radiation. It is shown that because of the high intensity and favorable distribution of the ultraviolet emission lines at 2967 to 3132 A, the quartz mercury-arc lamp is well adapted for standardizing photoelectr...
background: the goal was to upgrade and/or uprate the traditional non-contact array by producing few modifications in the configuration of this model in order to maximize light receiving of water from the uv lamp and a better disinfection. methods: an innovative non-contact model was made with a design based on irradiation of water, which was flowing as two thin waterfalls around a uv lamp in ...
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