Spectrophotometric microanalysis of silicate rocks for manganese after fusion with a lithium carbonate — boric acid mixture

1987 ◽  
Vol 326 (2) ◽  
pp. 156-157 ◽  
Author(s):  
Rokuro Kuroda ◽  
Yoshihiko Matsuzawa ◽  
Koichi Oguma
Keyword(s):  
Boric Acid ◽  
Lithium Carbonate ◽  
Acid Mixture ◽  
Silicate Rocks

Synthesis and structural characterization of Li3Y(BO3)2

2017 ◽  
Vol 72 (2) ◽  
pp. 153-158 ◽  
Author(s):  
Sebastian Bräuchle ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Solid State ◽  
Boric Acid ◽  
Structural Characterization ◽  
Diffraction Data ◽  
Lithium Carbonate ◽  
X Ray Diffraction ◽  
X Ray

AbstractLi3Y(BO3)2 was prepared by high-temperature solid state synthesis at 900°C in a platinum crucible from lithium carbonate, boric acid, and yttrium(III) oxide. The compound crystallizes monoclinically in the space group P21/c (no. 14) (Z=4) isotypically to Li3Gd(BO3)2. The structure was refined from single-crystal X-ray diffraction data: a=8.616(3), b=6.416(3), c=10.014(2) Å, β=116.6(2)°, V=494.9(3) Å3, R1=0.0211, and wR2=0.0378 for all data. The crystal structure of Li3Y(BO3)2 consists of [Y2O14] dinuclear units, which are interconnected to each other by planar B(1)O3 groups and LiO4 tetrahedra via common edges and corners along the a axis.

scholarly journals Effect of Boric Acid Mixture as Solid Lubricant towards Machining Processes

2013 ◽  
Vol 651 ◽  
pp. 372-377
Author(s):  
S. Sulaiman ◽  
M.K.A.M. Ariffin ◽  
T.S. Hong ◽  
N.A. Mustafa
Keyword(s):  
Boric Acid ◽  
Manufacturing Industry ◽  
Solid Lubricant ◽  
Metal Removal ◽  
Cutting Fluid ◽  
Acid Mixture ◽  
Machining Processes ◽  
Feasible Alternative ◽  
And Performance ◽  
Cutting Processes

Milling is widely used metal removal process in manufacturing industry that involves generation of high cutting forces and temperature. Lubricants become important to reduce the cutting force and temperature for better machining processes and performances. Conventional cutting fluid has some limitations. The applications of conventional cutting fluid create some techno-environmental problems like environmental pollution, biological problems to operators and water pollution. Application of solid lubricant in milling has proved to be a feasible alternative to the conventional cutting fluids. The present work investigates the effect of boric acid as solid lubricant towards machining performances such as tool wear and surface roughness. The results indicate that boric acid can improve the cutting processes and performance compared to conventional cutting fluid.

Multi-Phase Modeling of Journal Bearing With Oil and Boric Acid Lubricant

2008 ◽  
Author(s):  
Elon J. Terrell ◽  
C. Fred Higgs
Keyword(s):  
Fluid Dynamics ◽  
Boric Acid ◽  
Applied Load ◽  
Journal Bearing ◽  
Particle Dynamics ◽  
Cfd Modeling ◽  
Acid Mixture ◽  
Predictive Capability ◽  
Computational Fluid Dynamics Cfd ◽  
Multi Phase

Past studies have shown that oil lubricants with boric acid powder additives have the ability to both lubricate and support large amounts of applied load. In order to develop the predictive capability for a journal bearing that is lubricated with an oil/boric acid mixture, a multi-phase simulation was created which used particle dynamics and computational fluid dynamics (CFD) modeling.

On the Friction and Wear Performance of Boric Acid Lubricant Combinations in Extended Duration Operations

2005 ◽  
Author(s):  
P. V. Deshmukh ◽  
M. Lovell ◽  
W. G. Sawyer
Keyword(s):  
Boric Acid ◽  
Friction And Wear ◽  
Environmentally Friendly ◽  
Disk Surface ◽  
Acid Mixture ◽  
Engineering Systems ◽  
Wear Performance ◽  
Wide Range ◽  
Extended Duration ◽  
Pin On Disk

Lubrication is critical for minimizing wear in mechanical systems that operate for extended time periods. Developing lubricants that can be used in engineering systems without replenishment — particularly those that are environmentally friendly — is very important for increasing the functional lifetime of mechanical components. In the present investigation, extended duration pin-on-disk experiments were carried out to determine the relative performance of a wide range of lubricant combinations in a commercial brake valve assembly. In the experiments, the lubricants were initially applied to the disk surface but were not replenished over a sliding distance of more than 6000 m. The experimental results revealed that the environmentally friendly lubricant boric acid was inefficient for reducing the wear in the surfaces tested. When combined with a commercial transmission fluid, however, the boric acid mixture proved highly effective in terms of both friction and wear performance. Based on the success of the combined lubricant experiments, the boric acid was then mixed with canola oil to form a completely natural lubricant combination. Based on further pin on disk experiments, this lubricant combination yielded the best wear performance of all the lubricants tested. The importance of these results, as related to the use of the natural lubricant combination in other engineering systems was subsequently ascertained and discussed.

The Ultrastructure of Myocardial Cells in Normal and Cardiac Lethal Mutant Mexican Axolotls, (Ambystoma Mexicanum)

1970 ◽  
Vol 28 ◽  
pp. 62-63
Author(s):  
Larry F. Lemanski ◽  
Eldridge M. Bertke ◽  
J. T. Justus
Keyword(s):  
Fine Structure ◽  
Heart Development ◽  
Osmium Tetroxide ◽  
Picric Acid ◽  
Ambystoma Mexicanum ◽  
Recessive Mutation ◽  
Acid Mixture ◽  
Myocardial Cells ◽  
Lethal Mutant ◽  
Mexican Axolotl

A recessive mutation has been recently described in the Mexican Axolotl, Ambystoma mexicanum; in which the heart forms structurally, but does not contract (Humphrey, 1968. Anat. Rec. 160:475). In this study, the fine structure of myocardial cells from normal (+/+; +/c) and cardiac lethal mutant (c/c) embryos at Harrison's stage 40 was compared. The hearts were fixed in a 0.1 M phosphate buffered formaldehyde-glutaraldehyde-picric acid-styphnic acid mixture and were post fixed in 0.1 M s-collidine buffered 1% osmium tetroxide. A detailed study of heart development in normal and mutant embryos from stages 25-46 will be described elsewhere.

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