Ti-Ni Phase Diagram with Applied Stress

1993 ◽  
Vol 311 ◽  
Author(s):  
A.Peter Jardine
Keyword(s):  
Thin Film ◽  
Phase Diagram ◽  
Single Phase ◽  
Phase Evolution ◽  
The Other ◽  
Β Phase ◽  
The Stability ◽  
Tini Phase ◽  
Rich Side

ABSTRACTThe role of stress on the phase evolution of thin-film TiNi has not been investigated and may play an important role in the phase evolution of thin film TiNi. In this paper, a preliminary set of phase diagrams for Ni-Ti at different pressures are presented relating the stability of the stoichiometric TiNi phase to the other well-documented intermetallics TiNi3 and NiTi2. It is found that for sufficient pressure of the order of a GPa, the region where NiTi (β) phase is single phase shifts towards the Ti-rich side of the diagram. The implications on the annealing of TiNi thin film is discussed.

scholarly journals Tetracycline Induces Stabilization of mRNA in Bacillus subtilis

2002 ◽  
Vol 184 (4) ◽  
pp. 889-894 ◽  
Author(s):  
Yi Wei ◽  
David H. Bechhofer
Keyword(s):  
Bacillus Subtilis ◽  
Mrna Stability ◽  
The Other ◽  
Leader Region ◽  
Subinhibitory Concentration ◽  
Coding Sequence ◽  
Mrna Stabilization ◽  
Threefold Increase ◽  
The Stability

ABSTRACT The tet(L) gene of Bacillus subtilis confers low-level tetracycline (Tc) resistance. Previous work examining the >20-fold-inducible expression of tet(L) by Tc demonstrated a 12-fold translational induction. Here we show that the other component of tet(L) induction is at the level of mRNA stabilization. Addition of a subinhibitory concentration of Tc results in a two- to threefold increase in tet(L) mRNA stability. Using a plasmid-borne derivative of tet(L) with a large in-frame deletion of the coding sequence, the mechanism of Tc-induced stability was explored by measuring the decay of tet(L) mRNAs carrying specific mutations in the leader region. The results of these experiments, as well as experiments with a B. subtilis strain that is resistant to Tc due to a mutation in the ribosomal S10 protein, suggest different mechanisms for the effects of Tc on translation and on mRNA stability. The key role of the 5" end in determining mRNA stability was confirmed in these experiments. Surprisingly, the stability of several other B. subtilis mRNAs was also induced by Tc, which indicates that addition of Tc may result in a general stabilization of mRNA.

TiO2 and ZnO Water Sol Preparation by Sol–Gel Method and Application on Polyester Fabric of Antistatic Finishing

2011 ◽  
Vol 331 ◽  
pp. 270-274 ◽  
Author(s):  
Yan Yan Chu ◽  
Qing Wang ◽  
Shi Zhong Cui
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Sol Gel ◽  
Physical And Mechanical Properties ◽  
Polyester Fabric ◽  
Pure Tio2 ◽  
The Other ◽  
Baking Process ◽  
Result Show ◽  
The Stability

Abstract：Pure TiO2 water sol, pure ZnO water sol and three compound TiO2/ZnO water sols are prepared under low temperature. Then the padding and baking process is used to put the functional sol liquid on the fabric. SEM is use to analyzed the change of surface feature and the result show that all of the water sol except pure ZnO water sol liquid formed a thin film on the fiber The stability of pure ZnO water sol is the best one and the pure TiO2 water sol is the worst one at temperature of 15°C. The compound water sols stabilities are between these two water sols and with the more amount of ZnO, the stability last longer. Both mole of TiO2 and ZnO with the rate of 5 to 5 and 7 to 3 display the best antistatic behavior, but the washing fastnesses are not good. After treatment, the moisture regain displays most dramatically changes; the next one is whiteness of fabric, but the other physical and mechanical properties have a little change.

The Influence of Metallic Addition on Fluidity of Aluminum (LM6) Alloy

2013 ◽  
Vol 465-466 ◽  
pp. 954-957
Author(s):  
Roslee Ahmad ◽  
R. Sadeghi ◽  
M.B.A. Asmael ◽  
H. Mohamad ◽  
Zawati Harun ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Intermetallic Phase ◽  
Volume Ratio ◽  
The Other ◽  
Interfacial Region ◽  
Β Phase ◽  
Α Phase ◽  
Cr Addition ◽  
And Shifts ◽  
Fluidity Test

The effect of Cr addition on the fluidity of aluminum (LM6) alloy has been investigated by spiral fluidity test. Presence of 0.1 wt.% Cr decreased fluidity of melt due to formation of sludge. In fact Cr changes the morphology of the intermetallic phase from β-intermetallics less harmful polyhedral morphology (α-intermetallics). The β-phases have largest surface to volume ratio, hence they have the largest interfacial region with the melt and are the most detrimental intermetallic to drop off the fluidity. In Cr-containing alloys the effect of α-phase is less detrimental than β-phase to the fluidity. On the other hand sludge formation and consuming Si and shifts the local chemical composition of the melt to the aluminum side of the phase diagram which has lower fluidity than eutectic and hypereutectic compositions.

MODELING THE ROLE OF DISSOLVED OXYGEN-DEPENDENT BACTERIA ON BIODEGRADATION OF ORGANIC POLLUTANTS

2014 ◽  
Vol 07 (01) ◽  
pp. 1450008 ◽  
Author(s):  
J. B. SHUKLA ◽  
ASHISH GOYAL ◽  
P. K. TIWARI ◽  
A. K. MISRA
Keyword(s):  
Dissolved Oxygen ◽  
Water Body ◽  
Logistic Model ◽  
Simulation Analysis ◽  
Organic Pollutant ◽  
The Other ◽  
Nonlinear Mathematical Model ◽  
The Stability ◽  
The One

In this paper, a nonlinear mathematical model is proposed and analyzed to study the role of dissolved oxygen (DO)-dependent bacteria on biodegradation of one or two organic pollutant(s) in a water body. In the case of two organic pollutant(s), it is assumed that the one is fast degrading and the other is slow degrading and both are discharged into the water body from outside with constant rates. The density of bacteria is assumed to follow logistic model and its growth increases due to biodegradation of one or two organic pollutant(s) as well as with the increase in the concentration of DO. The model is analyzed using the stability theory of differential equations and by simulation. The model analysis shows that the concentration(s) of one or both organic pollutant(s) decrease(s) as the density of bacteria increases. It is noted that for very large density of bacteria, the organic pollutant(s) may be removed almost completely from the water body. It is found that simulation analysis confirms the analytical results. The results obtained in this paper are in line with the experimental observations published in literature.

Effects of Mobile and Chemically Bonded Molecules of Molecularly Thin Lubricant Film on the Vibrational Stability of a Sliding Ball

2004 ◽  
Author(s):  
Kentaro Tanaka ◽  
Masahiro Kawaguchi ◽  
Takahisa Kato ◽  
Katsumi Iwamoto
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Direct Contact ◽  
Disk Surface ◽  
Lubricant Film ◽  
Load Range ◽  
Molecularly Thin Lubricant ◽  
The Stability

Lubrication by an extremely thin film has become very important in micro machines, magnetic recording disks and so on. Molecularly thin perfluoropolyether (PFPE) films are considered a good lubricant for these micro devices. When the thickness of the PFPE film is thinned to several nanometers, it is possible to assume that the film consists of mobile and chemically bonded molecules. In this paper, we investigated the role of these molecules from the viewpoint of the vibrational stability of the sliding ball with the disk surface. From experiments by the ball on disk type tribotester, it is found that chemically bonded molecules prevent direct contact between the slider and the disk surface. Furthermore, when mobile molecules exist on bonded molecules, the stability is improved in wide load range.

Role of gallium and yttrium dopants on the stability and performance of solution processed indium oxide thin-film transistors

2019 ◽  
Vol 7 (25) ◽  
pp. 7627-7635 ◽  
Author(s):  
Felix Jaehnike ◽  
Duy Vu Pham ◽  
Claudia Bock ◽  
Ulrich Kunze
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Oxide Thin Film ◽  
Electrical Performance ◽  
Metal Oxide Thin Film ◽  
And Performance ◽  
The Stability ◽  
Yttrium Doping ◽  
Indium Oxide Thin Film

We study the effect of gallium and yttrium doping on both the electrical performance and the stability of indium based metal-oxide thin-film transistors (MOTFTs) at varied concentrations.

Possible Perforin-Munc13-4 Gene-Gene Interaction in Familial Hemophagocytic Lymphohistiocytosis

Blood ◽  
2008 ◽  
Vol 112 (11) ◽  
pp. 4643-4643
Author(s):  
Gunay Balta ◽  
Hamza Okur ◽  
Nurten Akarsu ◽  
Sule Unal ◽  
Cigdem Altay ◽  
...  
Keyword(s):  
Risk Factor ◽  
Genetic Risk ◽  
Genetic Risk Factor ◽  
The Other ◽  
Familial Hemophagocytic Lymphohistiocytosis ◽  
The Family ◽  
Syntaxin 11 ◽  
The Stability ◽  
Asymptomatic Sibling

Abstract Familial hemophagocytic lymphohistiocytosis (FHL) is an autosomal recessive immune dysregulation disorder associated with Perforin, Munc13-4 and Syntaxin 11 genes. The mutations in the Perforin gene are the most common cause of the disease. Among these mutations, the role of the Alanin91Valin (A91V) alteration in the pathogenesis of the disease has long been controversial. Even though this alteration can be considered as a polymorphism based on its high frequency in normal population (>3.7%) and homozygous existence in some healthy individuals, it is also considered as a genetic risk factor depending on its much higher frequency observed in FHL patients (22.7%) and compound heterozygous existence with other disease causing mutations in the Perforin gene in some FHL patients. Contrary to the previous publications concerning with the co-existence of heterozygous A91V with homozygous mutations in other described FHL genes, there has been no reports on homozygous co-existence of A91V up until this communication where we present the interesting results of a study which shed light not only on the role of A91V in development of FHL, but also on the etiopathogenesis of genetic diseases in general. The subject of the study was a 12 year old female patient who was a product of a first degree consanguineous marriage. Initial diagnosis was lymphomatoid granulomatosis due to the presence of symptoms associated solely with central nervous system. The correct diagnosis could be made 1 year later upon development of systemic findings of FHL. There was no history of similar disorder in the family. Linkage analysis in the family revealed homozygosity for both Perforin and Munc13-4 genes in the patient and for only Munc13-4 gene in one of the asymptomatic sibling who was heterozygous for Perforin gene. Syntaxin 11 gene was excluded in this analysis. Detected merely in the patient was a homozygous A91V substitution (272C>T) in the sequencing of the Perforin gene. Sequencing of the complete coding (32 exons) and the flanking sequences, on the other hand, led to the identification of a homozygous three nucleotide in-frame deletion (2135-2137delTCG) in exon 23 of Munc13-4 gene. This novel mutation resulted in the replacement of nonpolar two aminoacids (Ile-Gly) at positions 712-713 with a polar single aminoacid (Ser). It is plausible that the substitution of highly conserved two aminoacids, especially one (Ile) playing important role in the stability of proteins, with a hydrophilic one would alter the three dimensional structure and the stability of the protein, and would lead to FHL. Ironically, however, an asymptomatic sibling who is currently 22 year old was also homozygous for the mutation. This finding led to the assumption that the Munc13-4 mutation alone may not be sufficient for the development of the disease, but may be a genetic risk factor requiring co-existence of additional homozygous genetic risk factor situated in another FHL gene. If this is the case, it is reasonable to state that homozigosity for A91V in Perforin as well as homozygosity for the 2135-2137del mutation in Munc13-4 is a strong genetic susceptibility factor contributing significantly to the pathogenesis of the disease when they are co-existed. However, this notion could be valid as long as the sibling with homozygous Munc13-4 mutation stays asymptomatic. On the other hand, late onset and atypical presentation in the propositus may indicate that the homozygous co-existence of both alterations is not associated with serious clinical course of the disease as far as the presenting age of the disease is concerned.

scholarly journals The Role of Polarity on the Stability of Graphitic Compounds

1989 ◽  
Vol 162 ◽  
Author(s):  
Renata M. Wentzcovitch ◽  
Alessandra Continenza ◽  
A. J. Freeman
Keyword(s):  
The Other ◽  
Low Density ◽  
Hexagonal Diamond ◽  
The Family ◽  
The Stability

ABSTRACTThere is an old puzzle associated with the series of compounds formed by first row elements, C, BN, and BeO: similar to the other members of the family of octet semiconductors, these compounds exist in dense phases like diamond and zincblende, or hexagonal diamond (lonsdaleite) and wurtzite; however, whereas C and BN also exist in low density graphitic phases, BeO does not.

scholarly journals Mitigation of Platinum Depletion in Platinum Diffused Single Phase Bond Coat on CMSX-4 Superalloy

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 669
Author(s):  
Mingwen Bai ◽  
Ying Chen ◽  
Yongle Sun ◽  
Ping Xiao
Keyword(s):  
Single Crystal ◽  
Bond Coat ◽  
Single Phase ◽  
Selective Etching ◽  
The Other ◽  
Diffusion Behavior ◽  
Bond Coats ◽  
Β Phase ◽  
Diffusion Behaviour

Pt-diffused bond coat with a mixture of γ/γ’ phase has just been developed in the recent decades as a cheaper alternative to the Pt-enriched β-phase Aluminide bond coat that contains a higher content of Al. However, concerns are raised on the inevitable depletion of Pt near the coating interface that may endanger the component after long-term service. In this study, modified Pt-diffused bond coats with a single phase (γ or γ’) were made by applying selective etching on CMSX-4 single crystal superalloys prior to the electroplating of Pt. The single-phase bond coats show distinctive diffusion behaviour in comparison with the conventional γ/γ’ bond coat. Surprisingly, Pt remains more stable in the γ’-phase bond coat with significantly less depletion after diffusion, which implies a potential in saving a considerable amount of Pt. On the other hand, however, the depletion of Pt is more severe in the γ-phase bond coat. The mechanism that governs the diffusion behavior of Pt in the γ and γ’-phase was also discussed that mainly concerns with thermodynamic and kinetic factors.

THE ROLE OF RESONANCES IN PLANETARY SYSTEMS

2006 ◽  
Vol 16 (06) ◽  
pp. 1633-1644
Author(s):  
RUDOLF DVORAK
Keyword(s):  
Planetary Systems ◽  
The Other ◽  
Special Configuration ◽  
Small Bodies ◽  
Mean Motion Resonances ◽  
Extrasolar Systems ◽  
Eccentric Orbits ◽  
The Stability ◽  
Observational Techniques

This paper reviews the important role of resonances in the structure of planetary systems. After a short introduction to the basics of orbital dynamics of motion in resonances we describe the dynamics of our planetary systems and also of extrasolar planetary systems, where up to now more than 100 are known. In our planetary system the planets move in quite regular orbits with small eccentricities although it was found that the motion of the inner planets is "slightly" chaotic on time scales of tenths of millions of years. The quasi regularity (close to so-called quasi-periodic motion on a torus) is not true for the small bodies: the main belt of asteroids between Mars and Jupiter with gaps for special values of semimajor axes on one hand and with families of many small bodies on the other, is sculpted due to the presence of first mean motion resonances with Jupiter and second secular resonances with long-periodic motions of the nodes and perihelia of Jupiter and Saturn. In extrasolar systems the planets — rather surprisingly — are found to move sometimes in very high eccentric orbits when they are at distances comparable to the size of our planets. Because of our still limited observational techniques using indirect methods we have only discovered massive planets comparable to the size of Jupiter. When these planets orbit alone around their host star our research aims at the possibility of additional terrestrial planets moving in such a system. Because of mostly large eccentricities here the resonances are, in contrary to our planets, essential for the stability of orbits, and may protect or destroy an orbit. On the other hand, in multiple planetary systems we concentrate on the stability of their orbits as they are observed: a very interesting new result is that most of these multiple planetary systems with high eccentric orbits move in resonances with a special configuration which protects them from close encounters although these orbits are crossing.

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