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Analysis of Multiple Cracks in a Sandwiched Layer
The occurrence of rare minerals on decayed medieval Scottish building stone colonized by biological growths
During the course of a study of biodeterioration at Hermitage Castle in the Scottish Borders various rare minerals: monohydrocalcite, nesquehonite and dypingite were found in association with the biological growths. Monohydrocalcite was found particularly in association with a green alga "Trentepohlia aurea". A brief…
Congresos, Seminarios y Cursos
Manufacturing of mortars and concretes non-traditionals, by Portland cement, metakaoline and gypsum (15.05%)
In a thorough previous research (1), it appeared that creation, evolution and development of the values of compressive mechanical strength (CS) and flexural strength (FS), measured in specimens 1x1x6cm of mortar type ASTM C 452-68 (2), manufactured by ordinary Portland cement P-1 (14.11% C3A) or PY-6 (0.00% C3A), meta…
A Brief History of the Yield Stress
This short article is a summary of a recently published, lengthy review [1] in which the author challenges the often-accepted view that materials have yield stresses, below which no flow takes place. However, following the introduction of the new generation of controlled-stress rheometers it is shown that when careful…
Dielectric Properties of Short Sisal Fibre Reinforced SBR Composites
Role of Al2O3 Fibers (Saffil) in Thermal Treatment of 2014-Al2O3(f) Composite
In memoriam
Effect of Eucalyptus Oil Added Surfactants on the Rheology of Mucus Gel Simulants
Eucalyptus oil is a commonly used remedy for common colds. For a substance to be effective therapy in obstructive airway diseases, it must reduce the viscosity of respiratory mucus. The present study evaluates the effectiveness of eucalytpus oil added phospholipid mixtures as possible substitute therapies in diseases…
A New Method of Evaluating Spherical Fabric Deformation
In this paper, I present a study of the spherical elongation of fabrics under cyclic stresses on those parts of a garment that are most exposed to stress, the elbow and the knee. For this purpose, I have developed a new modified apparatus and a new method for testing the spherical deformation of fabric. In addition, I…
Magnetic Properties of Ordered and Disordered Spinel‐Phase Ferrimagnets
In spinel‐phase ferrimagnets, disorder in the cation distribution between octahedral and tetrahedral sites can influence such fundamental magnetic properties as saturation magnetization, exchange coupling, and ferrimagnetic ordering temperatures. Given the sensitivity of magnetic properties to structure, it has been s…
From cellulose to cell
The cell wall is often pictured as a more-or-less random feltwork of cellulose microfibrils in association with other polysaccharide and protein complexes. There is evidence from morphology, morphogenesis and mechanics that the structures in the cell wall are far more regular and that their interactions are driven by…
Magnetic impurity effects in metallic carbon nanotubes: local non-Fermi liquid theory
Magnetic impurity effects on metallic carbon nanotubes are studied theoretically. The resolvent method for the multi channel Kondo effect is applied to the band structure of the kp perturbation hamiltonian in the limit of the infinite onsite repulsion at the impurity site. We discuss the local non-Fermi liquid behavio…
Photoluminescence study of V-groove quantum wires: The influence of disorder on the optical spectra and the carrier thermalization
We report on time-resolved and steady-state photoluminescence studies of GaAs/AlGaAs V-groove quantum wire structures. Steady-state photoluminescence experiments are performed in the temperature range from 8K to 200K. We evaluate the relation between photoluminescence excitation and absorption and determine experiment…
Phase transition properties of a finite ferroelectric superlattice from the transverse Ising model
We consider a finite ferroelectric superlattice in which the elementary unit cell is made up of l atomic layers of type A and n atomic layers of type B. Based on the transverse Ising model we examine the phase transition properties of the ferroelectric superlattice. Using the transfer matrix method we derive the equat…
Effects of Nb and Zr Alloying Additions on the Activation Behavior of Ti in Hydrochloric Acid
The activation behaviors of air‐passivated commercially pure Ti, Ti‐50 wt % Zr, and Ti‐45 wt % Nb were investigated in hydrochloric acid (HCl) ranging from 0.1 to 10 M, and temperatures ranging from 13 to 52°C. In situ electrochemical impedance spectroscopy and X‐ray adsorption studies in 5 M HCl confirmed: ( i ) oxid…
Acid hydrolysis of bacterial cellulose reveals different modes of synergistic action between cellobiohydrolase I and endoglucanase I
Intact and partially acid hydrolyzed cellulose from Acetobacter xylinum were used as model substrates for cellulose hydrolysis by 1,4-beta-D-glucan-cellobiohydrolase I (CBH I) and 1,4-beta-D-endoglucanase I (EG I) from Trichoderma reesei. A high synergy between CBH I and EG I in simultaneous action was observed with i…
Determination of the Structure of Polyelectrolyte Brushes
We have prepared polyelectrolyte brushes on silicon blocks in two steps: first, we graft polystyrene (PS) chains terminated by a trichlorosilane group, and then, we convert the grafted PS to poly(styrenesulfonate, sodium salt) by using a soft sulfonation reaction. The grafted layers are fully characterized by ellipsom…
Electrical and environmental aging of silicone rubber used in outdoor insulation
This is a laboratory study on the aging of SIR and hydrophobicity recovery. UV radiation, corona discharges, acid rain, dry-band arcing are employed as sources of the aging. Chemical and morphological analysis is used to detect the surface chemical and structural changes derived from these stresses. The nature of high…