Perlit do?al olarak olu?an silis kökenli asidik özellikte volkanik bir kayaç türüdür. Perlitin en önemli özelli?i belirli s?cakl?klarda ?s?t?ld???nda genle?erek gözenekli hafif yap? olu?turmas?d?r. Olu?an bu ve perlite endüstriyel de?er katmaktad?r. Özellikle genle?mi? perlit yüksek ?s? ses yal?t?m olan harç üretimlerinde kullan?lan malzemelerden biri olup ayn? zamanda yang?na kar??da dayan?kl?...

Intermicrobial competition is known to occur in many natural environments, and can result from direct conflict between organisms, or from differential rates of growth, colonization, and/or nutrient acquisition. It has been difficult to extensively examine intermicrobial competition in situ, but these interactions may play an important role in the regulation of the many biogeochemical processes ...

abstract in this study, evaluation of swap model in simulating crop yield, water and salt movement in soil were investigated in the wheat- fodder maize cultivated units. the research was conducted in the voshmgir network, golestan province. the crop yield, soil humidity and moisture data in different times of agriculture year of 2007-2008 were measured. the measured and simulated data were anal...

Pengelasan merupakan proses penyambungan dua buah baja atau lebih. Penelitian ini bertujuan untuk menganalisis pengaruh temperatur media pendingin yang digunakan pada pendinginan karbon rendah pasca pengelasan terhadap nilai kekerasan dan perubahan struktur mikro. Temperatur yaitu 70°C, 80°C, 100°C dengan pengujian vickers beban 20 kgf metallografi. Peneliti menggunakan oli tanpa pemanasan, suh...

Bu çalışmada AISI 1020 çeliği 950 °C de yerli Baybora-2 borlama tozu kullanılarak 2, 4 ve 6 saat sürelerde katı işlemine tabi tutulmuştur. Numunelerin içyapıları optik mikroskop incelenmiştir. Borlama neticesinde yüzeyde oluşan bor tabakalarının kalınlık sertlik değerleri Mikrovickers ölçme cihazı belirlenmiştir. çeliğinin içyapısının ferrit perlit yapılarından oluştuğu tespit edilmiştir. Bor t...

plants and soil microbes are the main sources of most enzymes available in the environment. it is, therefore, anticipated that any change in the growth of soil biota in response to salinity, may reduce the synthesis and production of extra- and intra- cellular enzymes. as a result, a reduction in the growth of plants and the activity of soil microbes in saline environments may lessen the level ...

globally, soil erosion is one of the most important environmental problems which is threaten soil and water resources. soil properties are main parameters to affect runoff and soil erosion processes. so, this study was conducted to investigate the effects of some soil properties on runoff and soil erosion in the forest lands located in vicinity of sari city. rainfall simulator was set in 15 ran...

Activity concentrations, inventories and activity ratios of (137)Cs, (238)Pu, (239 + 240)Pu and (241)Am in soil profiles were surveyed in the dry tundra and the adjoining proglacial zones of glaciers at a High Arctic site on Svalbard. Vertical profiles of radionuclide activities were determined in up to 14-cm-thick soil sequences. Additionally, soil properties (pH, organic matter, texture, mine...