نتایج جستجو برای: time temperature shift factor
تعداد نتایج: 3060026 فیلتر نتایج به سال:
We analyze the influence of greenhouses in cultivation phytoplankton. For this we propose a model for marine green algae Tetraselmis suecica, and adapt it to four other species (Spirulina platensis, Dunaliella salina, Phaeodactylum tricornutum Chlorella vulgaris). Experiments under greenhouse were carried out shifting temperature two raceways compared reference raceway with free evolving temper...
We recently published a study concerning femtosecond pump–probe absorption edge spectroscopy of cubic GaN (fundamental bandgap: 3.23 eV), resulting in the transient dielectric function. In present study, we continue our investigations those measurements by determining time-dependent transition energy at Fermi-vector between conduction and valence bands. The generation electron–hole pairs 266 nm...
The monitoring of thermal ablation procedures would benefit from an acceleration in the rate at which MRI temperature maps are acquired. Constrained reconstruction techniques have been shown to be capable of generating high quality images using only a fraction of the k-space data. Here, we present a temporally constrained reconstruction (TCR) algorithm applied to proton resonance frequency shif...
In this letter, titania nanopowder and titania-silica nanocomposite were prepared using sol-gel method. Although the size of nanocrystallites and the mass fraction percent age of rutile phase ( after phase transformation ) were increased by increasing calcination in the two samples , their size in titania-silica nanocomposite was smaller than that in pure titania . Moreover, the calculations ...
Low noise terahertz (THz) receivers based on superconducting niobium nitride (NbN) hot electron bolometer (HEB) mixers have been designed, fabricated and measured for applications in astronomy and cosmology. The NbN HEB mixer consists of a planar antenna and an NbN bridge connecting across the antenna’s inner terminals on a high-resistivity Si substrate. To eliminate the influence of direct det...
The proton-resonance frequency (PRF) shift method of MR thermometry provides an easy and practical means of quantitatively monitoring in vivo temperatures for MR image-guided thermal-coagulation therapy. However, reported discrepancies in the numerical value of the PRF-thermal coefficient persist, when measured in a variety of experimental conditions and in different tissue types, both ex vivo ...
Background: Human body temperature varies with circadian rhythm. To determine the effect of shift work on the circadian rhythm of the distal-skin temperature, wrist temperatures were measured. Methods: Wrist-skin temperatures were measured by an iButton® Temperature Logger. It was measured every 3 min for two and eight consecutive working days in the day and shift workers, respectively. Mesor, ...
Most organisms have developed various strategies to react rapidly to temperature down-shift and regulate expression of various genes to acclimate to low temperature. In photosynthetic organisms, temperature down-shift in the light results in not only a decrease in growth temperature but also an increase in PSII excitation pressure. Distinguishing the effects of low temperature from the effects ...
بررسی تاثیر نوبت های کاری شبانه بر پردازش اطلاعات و هوشیاری در کارکنان اتاقهای کنترل صنایع پتروشیمی
Background and aims: Shift work and in particular night shift work is associated with many problems such as sleep deprivation, sleepiness, decreased cognitive performance, increased human errors, and fatigue; it is also one of the major contributors of increasing the likelihood of risk of accidents in the industry. Better matching between individuals’ circadian rhythm and night shift and ...
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