توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Method of isolating mineral salts from crude oil for preventing environmental pollution
اطلاعات انتشار: اولین کنفرانس ملی راهکارهای دستیابی به توسعه پایدار، سال
تعداد صفحات: ۵
The operation of isolating salt from crude oil is called desalination Because of water and salt with petroleum cause to damage in same oil devices and also causes to decrease petroleum quality andquantity, so the desalination operation is necessary. The desalination accompanies some principleswhich can be referred some cases such as pressure balance, isolating free water from petroleum, adding same chemical materials to separate the isolated water particles, heat, to performpreliminary process of water supply from petroleum and adding fresh water to petroleum .Thepurpose of desalination is elimination and decoration. Same salt with petroleum to acceptable about8–10 pounds per barrel that has same advantages such as decreasing the equipment's erosion ,decreasing chemical ,obstruction protection in catalysts action , improving crude oil quality , usingthe maximum pipes volume and preventing the lavish ant of the used energy in refinery .The desalination is performed in following different methods: sedimentation connection, chemical connection, thermal connection , mechanical connection , electrical connection Or combination of two or more about ways<\div>

۲Effect of combine forward speed and grain moisture content on yield quality inharvesting stage for tarom and fajre rice cultivars
نویسنده(ها): ،
اطلاعات انتشار: سومین همایش ملی علوم و صنایع غذایی، سال
تعداد صفحات: ۱۲
Rice is one of the most important grains in providing diet security. Regarding the rise in population, reduction of losses at harvest is crucial. Especially, considering the forward speed and grain moisture content which are two major factors in increasing crop losses have and been influenced by the wastages in different sections. Therefore, This study investigated on Combine quality losses in 3 grain moisture content; 20, 25 and 30% and 3 forward speed; 2, 3 and 4 km\h in harvesting two native Tarom and fajr rice variety in 1390–1391 production year, in Mazandaran province of Iran. Measurements were arranged by using a split–split plot fitted into randomized complete block design. Results indicated that increasing forward speed causes decreasing the broken grains. Increasing the input materials into thresher causes grain doesn't be in direct touch of thresher impacts and straw performs as a protection against thresher impacts. Highest breaking amount, around 0.30 percent, is related to Tarom variety and forward speed of 2 km\h. lowest amount of breaking is measured 0.21 and 0.17 percent, respectively, in Tarom and Fajr variety in rate of 4km\h. extra increasing and decreasing of grain moisture content causes increasing the paddy breakage. Lowest amount of breakage is measured 0.14 percent in rate of 4 km\h and moisture of 25 percent. Increasing the forward speed increases the amount of impurity in tank. Increase the inputs materials on cleaner section, decrease the cleaner section efficiency and increase impurity of straw and stubble in tank. Lowest impurity is measured 5.62 percent in forward speed of 2 km\h. Fajr variety because of more MOG, had more impurity, 5.41 percent, than Tarom impurity which was 8.31 percent.<\div>

۳Indirect–Passive Solar Dryer for Grapes
نویسنده(ها): ،
اطلاعات انتشار: سومین همایش ملی علوم و صنایع غذایی، سال
تعداد صفحات: ۶
Experiments for grapes drying using Indirect–Passive solar dryer were conducted at Tehran, Iran. Indirect–Passive solar dryer consisting of a solar air collector, a drying chamber in a series to supply hot air directly into the drying chamber using a dc fan and hiter. This drier has loading capacity of 10–12 kg of grapes. The design is based on energy balances and on an hourly–average radiation data reduction procedure for tilted surfaces. The analysis showed that the traditional drying, i.e. open sun drying, dried the grapes in 6–7 days, while the solar dryer took 2–4 days and produced better quality raisins. A major advantage this dryer is that loading and unloading is done cotemporaneous.<\div>

۴Comparison of a Sensitivity Study on CO2 Storage in Saline Aquifers
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس بین المللی علوم، مهندسی و فناوری های محیط زیست، سال
تعداد صفحات: ۱۲
It is recognised that saline aquifers have the potential to store large quantities of anthropogenic CO2. However, there is much uncertainty in aquifer properties which needs to be evaluated to ensure the safety of CO2 storage. In the CASSEM Project (CO2 Aquifer Storage Site Evaluation and Monitoring), we have studied CO2 storage in two hypothetical near–shore UK sites. The work was undertaken in three phases (or levels), starting with existing data and simple models and moving on to more complex models as more data became available. The sites had contrasting structures: Site A consisted of simple layers, while Site B was more complex with anticlines and synclines. Here we focus on the models in Levels 2 and 3. In Level 2, we had geological models, but no laboratory data, so typical values for properties such as relative permeabilities were assumed. In Level 3, the results of laboratory measurements were incorporated in simulations. We modified the Level 2 models in stages, changing one parameter at a time, so that we could evaluate its effect on pressure build–up at the wells, CO2 migration, dissolution and residual trapping. Thus the study formed a valuable sensitivity assessment. In the models for both sites, the most significant difference between the Level 2 and Level 3 results was the use of the relative permeabilities which had been measured in the laboratory. In the Site B model, where there was more uncertainty in petrophysical properties, a reassessment of the absolute permeability, which led to lowering the average value by a factor of four, also had a large effect. We also assessed multiple realisations of the geostatistical model, and found these had little effect in Model A, but had a large effect for Model B due to pressure building up to the limit for rock failure in wells in low permeability regions. Keywords: Aquifers– Hypothetical– Relative Permeabilities– Valuable Sensitivit<\div>

۵Gas separation using polymeric membranes
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس بین المللی علوم، مهندسی و فناوری های محیط زیست، سال
تعداد صفحات: ۱۱
Abstract The gas transport and separation properties of polymers have been successfully exploited in commercial ventures. Industrial applications employing membrane processes range from production of pure gases to barrier coatings for protection against environmental elements. Membrane separations are simple, energy efficient processes, which can be economically competitive with traditional separation technologies. Membrane separation and permeation characteristics for a particular mixed gas system is typically calculated from single–component transport parameters, namely, diffusion coefficients and solubility constants. In certain gas systems involving gaseous or vapor mixtures, where mass transport is affected by coupling effects or competition between penetrants for unrelaxed free volume, such calculations can lead to erroneous estimates of the membrane separation efficiency. Attempts to study the true transport phenomena effective during mixed gas permeation through membranes have been restricted due to experimental limitations. Also, the absence of rigorous theoretical models hinders the complete understanding of the transport phenomena. The novelty in the experimental set–up is the In–line sampling interface, used for injection of permeate gases in the GC without introducing any leaks in the permeate volume. Also, a novel data cropping technique is used to elucidate the transport properties of gases through membranes under mixed gas permeation conditions. Mixed gas feed concentration studies performed on a rubbery polymer (PDMS: poly dimethyl siloxane) showed no coupling effects. However, with a glassy polymer (NEW TPI: thermoplastic polyimide), the synergistic effects of gases is observed to play a major role in altering the gas transport and separation properties of the membrane<\div>
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