Effect of metal type on the metallocene‐catalyzed oligomerization of 1‐hexene and 1‐octene to produce polyα‐olefin‐based synthetic lubricants

2019 ◽  
Vol 34 (2) ◽  
Author(s):  
Aazam Jalali ◽  
Mehdi Nekoomanehs‐Haghighi ◽  
Sevda Dehghani ◽  
Naeimeh Bahri‐Laleh
Keyword(s):  
Metal Type ◽  
Synthetic Lubricants

Polymers contamination by heavy metal compounds

2002 ◽  
Vol 56 (11) ◽  
pp. 483-488
Author(s):  
Sasa Jovanic ◽  
Dragoslav Stoiljkovic ◽  
Ivanka Popovic
Keyword(s):  
Heavy Metal ◽  
Aqueous Medium ◽  
Metal Compound ◽  
Medium Temperature ◽  
Metal Compounds ◽  
Metal Type ◽  
Copper Manganese ◽  
Increasing Temperature

The contamination of important synthetic (surface unmodified) polymers by various heavy metal compounds (such as copper, manganese and lead) in aqueous medium was investigated in this study. The influence of the pH of the aqueous medium, temperature and metal type on contamination was investigated during a 10 day period. It was found that increasing pH contributed to higher polymer contamination (at higher pH 100 times for copper and up to 400 times for lead), as well as contact with easily penetrable substances. Increasing temperature decreased contamination by the metal compound for PELD and PET which was not the case for PEHD and PR.

scholarly journals Effect of Filler Metal Type on Microstructure and Mechanical Properties of Fabricated NiAl Bronze Alloy Using Wire Arc Additive Manufacturing System

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 513
Author(s):  
Jae Won Kim ◽  
Jae-Deuk Kim ◽  
Jooyoung Cheon ◽  
Changwook Ji
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Additive Manufacturing ◽  
Filler Metal ◽  
Gas Metal Arc Welding ◽  
Metal Wire ◽  
Cold Metal Transfer ◽  
Metal Type ◽  
Cold Metal ◽  
Wire Arc Additive Manufacturing

This study observed the effect of filler metal type on mechanical properties of NAB (NiAl-bronze) material fabricated using wire arc additive manufacturing (WAAM) technology. The selection of filler metal type is must consider the field condition, mechanical properties required by customers, and economics. This study analyzed the bead shape for representative two kind of filler metal types use to maintenance and fabricated a two-dimensional bulk NAB material. The cold metal transfer (CMT) mode of gas metal arc welding (GMAW) was used. For a comparison of mechanical properties, the study obtained three specimens per welding direction from the fabricated bulk NAB material. In the tensile test, the NAB material deposited using filler metal wire A showed higher tensile strength and lower elongation (approx. +71 MPa yield strength, +107.1 MPa ultimate tensile strength, −12.4% elongation) than that deposited with filler metal wire B. The reason is that, a mixture of tangled fine α platelets and dense lamellar eutectoid α + κIII structure with β´ phases was observed in the wall made with filler metal wire A. On the other hand, the wall made with filler metal wire B was dominated by coarse α phases and lamellar eutectoid α + κIII structure in between.

Heat balance, haematology and serum chemistry of layers under varying stocking density reared in locally fabricated metal-type cage system

2020 ◽  
Vol 40 (2) ◽  
pp. 92-103
Author(s):  
K. O. Bello ◽  
A. E. Adiatu ◽  
M. O. Osunlakin ◽  
O. O. Oni
Keyword(s):  
Relative Humidity ◽  
Ambient Temperature ◽  
Rectal Temperature ◽  
Heat Balance ◽  
Total Protein ◽  
Stocking Density ◽  
Fabricated Metal ◽  
Cage System ◽  
Chemical Measurements ◽  
Metal Type

One hundred and thirty five 18weeks old Bovans Nera Black strain pullets were used in a 10week study to determine their heat balance and blood profile under varying stocking density in locally fabricated metal-type cage system. The cages were stocked 2, 3 and 4birds/cell. Daily ambient temperature and relative humidity of the cage and rectal temperature of the birds were taken and heat balance calculated. Record of Packed cell volume (PCV), Haemoglobin concentration (Hb), Red blood cell (RBC), White blood count (WBC) and differential of the birds were taken at beginning and end of the study for the haematological indices while blood glucose, total protein, Albumin and blood urea were taken for the bio-chemical measurements. Ambient temperature, relative humidity, and heat balance showed no significant (P>0.05) difference with cage stocking density. Cage stocking density had significant (P<0.05) effect on rectal temperature of layers. Bird stocked 3/cell recorded the least (41.14oC) rectal temperature while those stocked 4/cell recorded the highest (41.27oC). All the haematological parameters of the birds were not significantly (P>0.05) influenced by stocking density of the cage type. Bio-chemical measurements were not significantly (P>0.05) different among layers under varying stocking density of the cage except total protein (P<0.05). Layers stocked 4/cell recorded highest (5.22g/dl) total protein while those stocked 3/cell had the least value (4.37g/dl). However, the values were within the normal range recommended for healthy chicken. The study concluded that locally fabricated metal-type battery cage could be used to rear layers and stocking density of 3birds/cell is ideal without compromising the welfare of the birds.

Modulated vacancy ordering in SrGe6−x (x≈0.45)

2019 ◽  
Vol 74 (1) ◽  
pp. 137-145 ◽  
Author(s):  
Ulrich Schwarz ◽  
Rodrigo Castillo ◽  
Aron Wosylus ◽  
Lev Akselrud ◽  
Yurii Prots ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ambient Pressure ◽  
Stoichiometric Composition ◽  
Binary Compound ◽  
Crystal Structure Analysis ◽  
Local Defect ◽  
X Ray Diffraction ◽  
Vacancy Ordering ◽  
Metal Type ◽  
A Charge

AbstractThe structural properties of modulated SrGe6−x (x≈0.45) were investigated by means of single-crystal and powder X-ray diffraction combined with quantum chemical calculations. The framework compound SrGe6−x adopts a defect variant of the EuGa2Ge4-type crystal structure. Samples of the binary compound with nominal compositions 0≤x≤0.5 were synthesized at pressures from 5 to 6 GPa and a temperature of typically 1400 K. The product reveals diffraction peaks of the EuGa2Ge4-type subcell plus additional reflections indicating an ordered superstructure. Detailed crystal structure analysis evidences the incommensurate nature of the superstructure and a modulation of the vacancy ordering in the germanium network. The computations have shown that the non-stoichiometric composition of the framework with its local defect organization affects the calculated charge of the strontium anions. Although the chemical composition is close to a charge-balanced situation, temperature-dependent resistivity measurements showed metal-type conductivity. At ambient pressure SrGe6−x decomposes exothermally and irreversibly at T=680(10) K into SrGe2 and germanium, indicating its metastable nature at ambient pressure.

scholarly journals Action of Organoaluminum Reagents on Esters: Alkene Production and the Degradation of Synthetic Lubricants

2018 ◽  
Vol 38 (2) ◽  
pp. 395-408
Author(s):  
Jonathan Slaughter ◽  
Samuel A. Molyneux ◽  
Andrew J. Peel ◽  
Andrew E. H. Wheatley
Keyword(s):  
Synthetic Lubricants ◽  
Alkene Production

Study of ferromagnetic-metal type Sr2FeMoO6+xAg (x=0–10wt%) composites

2013 ◽  
Vol 559 ◽  
pp. 64-68 ◽  
Author(s):  
Nitu Kumar ◽  
R.P. Aloysius ◽  
Anurag Gaur ◽  
R.K. Kotnala
Keyword(s):  
Ferromagnetic Metal ◽  
Metal Type
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