Fetoplacental weight ratio in relation to PM2.5 exposure during the gestation in Tokyo, Japan

Aluminum-lithium alloys have a low density and high strength to weight ratio. They are being developed for the aerospace industry.The high strength of Al-Li can be attributed to precipitation hardening. Unfortunately when aged, Al-Li aquires a low ductility and fracture toughness. The precipitate in Al-Li is part of a sequence SSSS → Al3Li → AlLi A description of the phases may be found in reference 1 . This paper is primarily concerned with the Al3Li phase. The addition of Zr to Al-Li is being explored to find the optimum in properties. Zirconium improves fracture toughness and inhibits recrystallization. This study is a comparision between two Al-Li-Zr alloys differing in Zr concentration.Al-2.99Li-0.17Zr(alloy A) and Al-2.99Li-0.67Zr (alloy B) were solutionized for one hour at 500oc followed by a water quench. The specimens were then aged at 150°C for 16 or 40 hours. The foils were punched into 3mm discs. The specimens were electropolished with a 1/3 nitric acid 2/3 methanol solution. The transmission electron microscopy was conducted on the JEM 200CX microscope.

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Precipitate coarsening during hot-compression testing of NiAl + 2 at.% Nb

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100144462 ◽

1986 ◽

Vol 44 ◽

pp. 598-599

Author(s):

W. M. Sherman ◽

K. M. Vedula

Keyword(s):

High Temperature ◽

Flow Stress ◽

Weight Ratio ◽

Constant Strain Rate ◽

Hot Compression ◽

Compression Testing ◽

Second Phase ◽

Precipitate Coarsening ◽

High Temperature Mechanical Properties ◽

Ordered Intermetallic

The strength to weight ratio and oxidation resistance of NiAl make this ordered intermetallic, with some modifications, an attractive candidate to compete with many superalloys for high temperature applications. Recent studies have shown that the inherent brittleness of many polycrystalline intermetallics can be overcome by micro and macroalloying. It has also been found that the high temperature mechanical properties of NiAl can be enhanced through the addition of Nb by powder metallurgical techniques forming a dispersed second phase through interdiffusion in a polycrystalline matrix. A drop in the flow stress is observed however in a NiAl-2 at.% Nb alloy after 0.2 % strain during constant strain rate hot compression testing at 1025°C. The object of this investigation was to identify the second phase and to determine the cause of the flow stress drop.

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Rheological characterization of tack and viscoelasticity of compositions of crepe coating used in the Yankee dryer

TAPPI Journal ◽

10.32964/tj18.11.641 ◽

2019 ◽

Vol 18 (11) ◽

pp. 641-649

Author(s):

JOSHUA OMAMBALA ◽

CARL MCINTYRE

Keyword(s):

Normal Force ◽

Weight Ratio ◽

Good Combination ◽

Rheological Characterization ◽

Nonlinear Viscoelastic ◽

Coating Composition ◽

Linear And Nonlinear ◽

Work Done ◽

Tissue Production

The vast majority of tissue production uses creping to achieve the required set of properties on the base sheet. The Yankee coating helps to develop the desired crepe that in turn determines properties such as bulk and softness. The adhesion of the sheet to the Yankee surface is a very important characteristic to consider in achieving the desired crepe. The coating mix usually consists of the adhesive, modifier, and release. A good combination of these components is essential to achieving the desired properties of the tissue or towel, which often are determined by trials on the machine that can be time consuming and lead to costly rejects. In this paper, five compositions of an industrial Yankee coating adhesive, modifier, and release were examined rheologically. The weight ratio of the adhesive was kept constant at 30% in all five compositions and the modifier and release ratios were varied. The normal force and work done by the different compositions have been shown at various temperatures simulating that of the Yankee surface, and the oscillatory test was carried out to explain the linear and nonlinear viscoelastic characteristic of the optimal coating composition.

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18. Respiratory Function and PM2.5 Exposure in a Cohort of Firefighters Doing Prescribed Forest Burns in the Southeastern United States

10.3320/1.2758165 ◽

2004 ◽

Author(s):

L. Naeher ◽

C. Carlton ◽

D. MacIntosh ◽

D. Shea ◽

G. Achtemeier

Keyword(s):

United States ◽

Respiratory Function ◽

Southeastern United States ◽

Pm2.5 Exposure

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TUNGUM ALLOY

Alloy Digest ◽

10.31399/asm.ad.cu0806 ◽

2012 ◽

Vol 61 (5) ◽

Keyword(s):

Corrosion Resistance ◽

Physical Properties ◽

Tensile Properties ◽

Weight Ratio ◽

High Strength ◽

Fatigue Properties ◽

Excellent Corrosion Resistance

Abstract Tungum alloy combines an unusually high strength-to-weight ratio, with ductility, excellent corrosion resistance, and good fatigue properties. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming. Filing Code: Cu-806. Producer or source: Tungum Ltd.

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SANDVIK Ti-3Al-2.5V GRADE 9

Alloy Digest ◽

10.31399/asm.ad.ti0109 ◽

1997 ◽

Vol 46 (9) ◽

Keyword(s):

Corrosion Resistance ◽

Endurance Limit ◽

Weight Ratio ◽

High Strength ◽

Strain Ratio ◽

Bend Strength ◽

Aerospace Applications ◽

Excellent Corrosion Resistance ◽

Titanium Aluminum ◽

Fatigue Endurance

Abstract Sandvik Ti-3Al-2.5V Grade 9 titanium-aluminum alloy offers excellent corrosion resistance, especially to chloride media, and has a high strength-to-weight ratio, which is especially suitable for use in aerospace applications. Tubing can be produced having a CSR (contractile strain ratio) that enhances the fatigue endurance limit. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength as well as fatigue. It also includes information on corrosion resistance as well as forming, machining, and joining. Filing Code: TI-109. Producer or source: Sandvik.

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HAYNES Ti-3Al-2.5V

Alloy Digest ◽

10.31399/asm.ad.ti0145 ◽

2008 ◽

Vol 57 (1) ◽

Keyword(s):

Stainless Steel ◽

Physical Properties ◽

Tensile Properties ◽

Weight Ratio ◽

Heat Treating ◽

Hydraulic Systems ◽

Seamless Tubing

Abstract Haynes Ti-3Al-2.5V alloy is used where the strength/weight ratio is of prime importance; the alloy is 43% lighter than 21-6-9 stainless steel. It is most often used in the form of seamless tubing for aircraft hydraulic systems. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on forming, heat treating, and joining. Filing Code: TI-145. Producer or source: Haynes International Inc.

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G-E ALLOY J-1300

Alloy Digest ◽

10.31399/asm.ad.ss0083 ◽

1959 ◽

Vol 8 (1) ◽

Keyword(s):

High Temperature ◽

Physical Properties ◽

Precipitation Hardening ◽

Base Alloy ◽

Weight Ratio ◽

Heat Treating ◽

General Electric Company ◽

Iron Base Alloy ◽

Electric Company ◽

Temperature Performance

Abstract G-E ALLOY J-1300 is a precipitation hardening iron-base alloy with an excellent strength to weight ratio. It is recommended for applications in the 1350 F. range. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SS-83. Producer or source: General Electric Company.

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DONEGAL DC-50

Alloy Digest ◽

10.31399/asm.ad.ss0017 ◽

1954 ◽

Vol 3 (8) ◽

Keyword(s):

Fracture Toughness ◽

Stainless Steel ◽

Corrosion Resistance ◽

Physical Properties ◽

Surface Treatment ◽

Tensile Properties ◽

Precipitation Hardening ◽

Weight Ratio ◽

High Strength ◽

Heat Treating

Abstract Donegal DC-50 is a precipitation hardening stainless steel having high strength-weight ratio. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as casting, heat treating, machining, joining, and surface treatment. Filing Code: SS-17. Producer or source: Donegal Manufacturing Corporation.

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ACTION ON MATTER: THE HISTORY OF THE UNIQUELY AFRICAN TAMPER AND CONCAVE ANVIL POT-FORMING TECHNIQUE

Journal of African Archaeology ◽

10.3213/1612-1651-10001 ◽

2003 ◽

Vol 1 (1) ◽

pp. 3-35 ◽

Cited By ~ 19

Author(s):

Judy Sterner ◽

Nicholas David

Keyword(s):

Historical Development ◽

Weight Ratio ◽

High Volume ◽

Efficient Production ◽

Arid Environments ◽

Historical Evidence ◽

Culture History ◽

History Of ◽

And Diffusion

The publication, largely by ethnoarchaeologists, of new data on the tamper and concave anvil technique of pot-forming (TCA) permits a reassessment of this uniquely African technique, its toolkit, and its culture history. A survey, inspired by the technologie culturelle school, of its varied expressions in the southern Saharan, Sahelian and northern Sudan zones from Mali to Sudan and extending north into Egypt emphasises the potential of the technique for the efficient production of spherical water jars of high volume to weight ratio, much appreciated in arid environments. The technique is demanding and therefore practised for the most part by specialists. The origins and diffusion of the technique are assessed in the light of the ethnological, archaeological, linguistic, and historical evidence, and a four stage historical development is sketched.

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