نتایج جستجو برای: carbon yeild
تعداد نتایج: 281295 فیلتر نتایج به سال:
in a semiarid region of central iran, effects of parent materials, physiography and landscape position, land use, andmanagement practices on association of organic carbon with secondary (aggregates) particles and aggregate stability canhave important consequences in terms of carbon sequestration and budgeting, deciding on the proper land use strategy andsuitable soil conservation practices. it ...
diamond like carbon (dlc) film was grown by hot filament chemical vapor deposition (hfcvd)technique. in the present work, we investigated the quality of the dlc films groew on the substratesthat were coated with various metal nanocatalysts (au and ni). a combination of ch4/ar/h2 rendersthe growth of carbon nanostructures technique (diamond like carbon). the utilized samples werecharacterized by...
Abstract Background and objectives: Access to real information and data on the impact of watershed management projects and their technical and economic evaluation is possible through representative and paired catchments. Since management operations and topographic characteristics have a great impact on carbon retention in ecosystems, this study aimed to determine the amount of soil organic ca...
قسمت اول: نانوذرات پالادیم قرار گرفته بر روی بسترهای فسفردار شده و بدون فسفر برای تشکیل پیوند کربن-کربن قسمت دوم: سنتز و کاربرد سنتزی نمک های آزو پیریدینیوم به عنوان مایع های یونی جدید در قسمت اول این پایان نامه، یک روش عملی و ساده برای فسفره کردن مستقیم سیلیکاژل برای تهیه سیلیکا دی فنیل فسفینیت sdpp(iv) شرح داده می شود. این سیلیکای فسفره شده با پالادیم (+2) [pd(ii)] واکنش می دهد و کاتالیزو...
a chemically modified carbon paste electrode with multiwall carbon nanotube (mwcnt) was prepared and used as a sensor for cu2+ ion. the unique chemical and physical properties of cnt have paved the way to new and improved sensing devices. a central composite chemometrics design was applied for multivariate optimization of the effects of three significant parameters (graphi...
Carbon fibers are fabricated from different materials such as special polyacrylonitrile (PAN) fibers, cellulose fibers and pitch. But PAN fibers are recognized as the most widely used precursor for the present-day manufacture of carbon fibers. The process of fabrication carbon fibers from special PAN fibers is composed of two steps including oxidative stabilization at low temperature and carbon...
to day, the activated carbon is being used to treat the industrial and domestic wastewaters. the suitability of activated carbon for treatment of industrial wastewaters can be quickly predicted by consideration of wastewater characteristics. the results of this paper represent a first step in determining suitability of activated carbon for treatment of wastewaters or effluent of treatment plant...
there is no single standard technique or methodology to characterize the size, structure, number, and chemical composition of airborne carbon nanotubes. existing analytical instruments and analytical techniques for evaluating nanoparticle concentrations cannot simultaneously provide morphology, state of agglomeration, surface area, mass, size distribution and chemical composition data critical...
in the present study, modelling and vibration analysis of carbon nanotubes/ fiber/ polymer composite microplates are investigated. the governing equations of the carbon nanotubes/ fiber/ polymer composite microplates are derived based on first order shear deformation plate theory, rather than other plate theories, due to accuracy and simplicity of polynomial functions. the modified couple stres...
desertification leads to decrease in the ecosystem c pool and attendant reduction in soil organic carbon (soc). reclamation of sandy land in arid and semi-arid has a high potential to increase carbon sequestration and improving soil quality. our objective as to examine the changes in the soil carbon sequestration and soil properties of two soil layers (0–20 and 20-50 cm) under two types of recl...
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