نتایج جستجو برای: temperature effects
تعداد نتایج: 1929983 فیلتر نتایج به سال:
in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...
The effect of temperature on the force-sarcomere velocity relation (200, 250, and 300 C) and maximum velocity of sarcomere shortening (V0; range 15°-35° C) was studied in trabeculae from rat heart. Sarcomere length and V. were measured by laser diffraction techniques. Sarcomere length and sarcomere velocity, determined from each of the first-order diffraction lines, differed by less than 4%. Sl...
We present a model capturing the important contributors to the effects of temperature on the observable electrophoretic mobilities of small ions, and on solution conductivity and pH. Our temperature model includes relations for temperature-dependent viscosity, ionic strength corrections, degree of ionization (pK), and ion solvation effects on mobility. We incorporate thermophysical data for wat...
An experimental and theoretical study is reported which successfully achieves agreement between the photoconductive properties exhibited in n-type Hg 0. 6 Cd 0 4 Te and a model based on the theory of minority carrier trapping. Photoconductive properties are described which were measured over a range of temperature and background conditions. The temperature range was from 80 *K to 300 *K; the ba...
the west of esfahan province, iran, is one of the most important agricultural areas throughout the country due to the climate variability and life-giving water of zayanderood river. rice is one of the major and economic crops in this area. the most important climatic elements in agricultural activities which should be considered include temperature, relative humidity, precipitation and wind. so...
this study examined the effects of collaborative strategic reading and direct instruction in persuasion on iranian high school students persuasive writing and attitudes. students in three intact classes were assigned to one of three treatment conditions: collaborative strategic reading and direct instruction in persuasion or direct instruction in persuasion or a control group. treatment effects...
a large number of single research studies on the effects of strategy-based instruction (sbi) in teaching english as a foreign or second language has been conducted so far. however, the lack of a comprehensive meta-analysis targeting the effectiveness of english language sbi is observed. moreover, the findings of experimental studies regarding the context of the english language, proficiency lev...
Periodic temperature changes represent one of the most effective entraining (Zeitgeber) signals for circadian clocks in many organisms. Different constant temperatures affect the circadian amplitude and ultimately the expression of circadian clocks, while the circadian period length (tau) remains approximately constant (temperature compensation). Experimental results and theoretical models are ...
Temperature is an often overlooked water quality parameter that may influence corrosion of iron pipes in drinking water distribution systems. This study examined corrosion of cast iron samples in an aerobic, microbially stable water at different constant temperatures (5, 20, and 25°C) as well as in waters where the temperature continuously cycled (17.5 – 23°C and 5 – 20°C). The composition and ...
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