Results 211 to 220 of about 75,321 (266)

Uniform Amorphization of Crystalline Silicon Surfaces Enabled by Deep Ultraviolet Femtosecond Laser Pulses

Advanced Engineering Materials, EarlyView.
Deep‐UV (258 nm) femtosecond pulses enable uniform amorphous silicon writing on Si(100)/(111) with a six‐fold larger fluence amorphization window than NIR methods. Optimized fluence and overlap yield 20–45 nm uniform and continuous amorphous layers. Microscopy shows sharp interfaces, and real‐time reflectivity reveals nanosecond melt–resolidification ...
Wissal Benali, Magali Gregoire, Matys Guyard, Tatiana Itina, David Grojo, Pol Sopeña   +5 more
wiley   +1 more source

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Effects of fines content on packing density of fine aggregate in concrete

Construction and Building Materials, 2014
Abstract The fines content (particles finer than 75 μm) in aggregate has substantial effects on the performance of concrete. Since the fines content has large surface area that would increase the water demand, maximum limits are often imposed. However, the fines content would also fill into the voids between larger particles to increase the packing ...
A.K.H. Kwan, P.L. Ng, K.Y. Huen
openaire   +3 more sources

Properties of concrete prepared with crushed fine stone, furnace bottom ash and fine recycled aggregate as fine aggregates

Construction and Building Materials, 2009
Abstract This paper presents the results of a study to compare the properties of concretes prepared with the use river sand, crushed fine stone (CFS), furnace bottom ash (FBA), and fine recycled aggregate (FRA) as fine aggregates. Two methods were used to design the concrete mixes: (i) fixed water–cement ratio (W/C) and (ii) fixed slump ranges.
Shi-Cong Kou, Chi-Sun Poon
openaire   +1 more source

Fine grinding of aggregated powders

Powder Technology, 2002
In many cases, including natural ores as well as synthetic powders, fine grinding involves the breakage of bound aggregates rather than solid particles. The characteristics of breakage in such systems have been investigated by experimental studies of grinding kinetics, in a model system of partially sintered alumina particles, ground in a laboratory ...
R Hogg, A.J Dynys, H Cho
openaire   +1 more source

Aggregation Rate of Fine Sediment

Journal of Hydraulic Engineering, 2000
A dynamical description of estuarial fine sediment aggregation has been developed. The spectrum of fine particle or agglomerate size is represented by a discrete number of classes based on particle mass. Aggregation and disaggregation, respectively, move mass up and down through the classes.
William H. McAnally, Ashish J. Mehta
openaire   +1 more source

Study on the durability of concrete with FNS fine aggregate

Journal of Hazardous Materials, 2020
As a by-product of nickel production, the ferronickel slag (FNS) puts a lot of pressure on the environment. It is becoming more and more urgent to deal with the increasing FNS. The aim of this study is to explore the durability of concrete with FNS fine aggregate. Two kinds of FNS with different storage time were selected.
Xiaoming Liu, Tingyu Li, Weiguang Tian, Yiqun Wang, Yanhu Chen   +4 more
openaire   +2 more sources

Sand: The Fine Aggregate

2014
Aggregate materials like sand, gravel, and crushed stone occupy a substantial volume of concrete used in constructions. The demand for high quality aggregates that meet the specifications of civil engineers for construction activities is increasing year after year.
D. Padmalal, K. Maya
openaire   +1 more source

Adhesion and aggregation of fine particles

Powder Technology, 2001
The influence of interparticle adhesion on the formation and properties of aggregates is reviewed. Increasing the adhesive forces between particles in an aggregate should raise the strength of the aggregate because each particle contact then requires more force for fracture. However, it is well known experimentally that strongly adhesive fine particles
Kevin Kendall, Carl Stainton
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Chain Formation of Fine Particle Aggregates

Nature, 1970
WHEN particles of colloidal sizes aggregate “chain formation” is frequently observed. An extreme example is the flocculation of magnet particles1, where stearic mechanisms are undoubtedly involved, but a wide range of spherical particles including both liquid sols and aerosols also contain unexpectedly long strings of particles (for example, refs. 2–5).
openaire   +2 more sources