نتایج جستجو برای: clay particles percentage

تعداد نتایج: 309119  

Journal: :مدیریت خاک و تولید پایدار 0
علی اکبر صفری سنجانی همدان، دانشگاه بوعلی سینا سیما نورمحمدی شفق دانشگاه بوعلی سینا

background and objectives:anionic polyacrylamide application as an organic conditioner alone or in combination with organic material, can improve soil properties. the objective of this study was to investigate the influence some organic conditioners on mean weight diameter (mwd) and dispersible clay percentage (dcp).materials and methods:soil samples collected from the top 30-cm layer of two lo...

Journal: :Applied and environmental microbiology 1997
F Quignon M Sardin L Kiene L Schwartzbrod

A pilot-scale study was initiated to examine the behavior of viruses pulse injected into a distribution system. The influence of a free-chlorine residual and that of virus preadsorption to clay particles was evaluated by tracing the viruses both in the water flow and after elution from the biofilm. These experiments demonstrated, first, that virus preadsorption on 40 mg of Na-montmorillonite pe...

Journal: :Advances in physiology education 2011
Mary Ellen DeHoff Krista L Clark Karthikeyan Meganathan

Alternatives and/or supplements to animal dissection are being explored by educators of human anatomy at different academic levels. Clay modeling is one such alternative that provides a kinesthetic, three-dimensional, constructive, and sensory approach to learning human anatomy. The present study compared two laboratory techniques, clay modeling of human anatomy and dissection of preserved cat ...

2008
S. Pavía

This work applies established analytical techniques of physical sciences to Irish brick in order to gather evidence of ceramic technologies, provenance and sources of raw materials. Petrographic microscopy, X-ray diffractometry and scanning electron microscopy with an energy dispersive Xray diffraction attachment were used to study the brick of Rathfarham Castle, Dublin, built c.1618, where cla...

Journal: :تحقیقات مهندسی کشاورزی 0
سعید مینایی دانشیار گروه مکانیک ماشین های کشاورزی دانشگاه تربیت مدرس میثم ستاری نجف آبادی دانشجوی سابق کارشناسی ارشد گروه مکانیک ماشین های کشاورزی دانشگاه تربیت مدرس محمدحسین عزیزی دانشیار گروه علوم و صنایع غذایی دانشگاه تربیت مدرس حامد افشاری استادیار دانشگاه آزاد اسلامی واحد رودهن

in this research, the mechanical properties of seven types of nanofilm with differing amounts of silver and silver-clay particles were studied. the elasticity of modulus, tensile strength, toughness, elongation at break, tear strength and color of nanofilms were compared with those of ordinary ldpe film. results showed that the inclusion of nano particles increased the modulus of elasticity, te...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور مرکز - دانشکده علوم 1391

سنتز پلیمرهای کوئوردیناسیونی جدید از لیگاندهای 2-آمینو نیکوتینیک اسید، 2-کینولین کربوکسیلیک اسید، 2-پیرازین کربوکسیلیک اسید در ابعاد توده، با روش گرایان دمایی و با استفاده از شاخه ی جانبی انجام شده است، این پلیمرها توسط روش طیف سنجی ir شناسایی و پایداری گرمایی آن ها توسط تجزیه های وزن سنجی حرارتی (tga) و تجزیه ی گرمایی تفاضلی (dta) بررسی شده است. در ادامه، ساختار این ترکیبات توسط بلورنگاری پرتو...

2005
Patricia Stoffyn-Egli

The oldest sediment most recently recovered from the Arctic Ocean is a biosiliceous ooze nearly devoid of nonbiogenic particles and exhibiting small-scale color changes. Color variations are due to changes in iron and manganese content. These elements are probably of local hydrothermal origin, and the Mn precipitation may be bacteria-mediated. An iron silicate phase seems to form at the expense...

2016
A. Gholamipour-Shirazi M. S. Carvalho M. F. G. Huila K. Araki P. Dommersnes J. O. Fossum

Colloidal clay in water suspensions are known to exhibit a multitude of bulk phases depending on initial colloidal concentration and ionic strength, and examples of this include repulsive Wigner colloidal glasses at low ionic strength and attractive gels at higher ionic strength due to screened electrostatic forces by the electrolyte. From confocal Raman microscopy combined with elasticity meas...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2015
Phillip Woolston Jeroen S van Duijneveldt

Aqueous suspensions of clay particles, such as montmorillonite (MMT) platelets and sepiolite (Sep) rods, tend to form gels at concentrations around 1 vol %. For Sep rods, adsorbing sodium polyacrylate to the surface allows for an isotropic-nematic phase separation to be seen instead. Here, MMT is added to such Sep suspensions, resulting in a complex phase behavior. Across a range of clay concen...

2008
S. Bonelli D. Marot

Suffusion is the process whereby fine particles are moved locally an transported through a coarse layer. This is a bulk erosion, which corresponds to a source term in the mass balance equations. This bulk erosion is counter intuitive, as erosion is basicaly an interfacial process. We suggest a framework within suffusion in a clayey sand can be viewed as a clay/water interface erosion at the mic...

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