Measurements of the electrical conductivity of Wood's alloy and other low melting point alloys

1994 ◽  
Vol 25 (6) ◽  
pp. 937-939 ◽  
Author(s):  
Amrita Verma ◽  
J. W. Evans
Keyword(s):  
Electrical Conductivity ◽  
Melting Point ◽  
Wood’S Alloy

scholarly journals Development of Antibacterial and Antifungal Triazole Chromium(III) and Cobalt(II) Complexes: Synthesis and Biological Activity Evaluations

Molecules ◽  
2018 ◽  
Vol 23 (8) ◽  
pp. 2013 ◽  
Author(s):  
Ricardo Murcia ◽  
Sandra Leal ◽  
Martha Roa ◽  
Edgar Nagles ◽  
Alvaro Muñoz-Castro ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Biological Activity ◽  
Melting Point ◽  
Inhibitory Concentration ◽  
Vero Cells ◽  
Visible Spectroscopy ◽  
Antifungal Activities ◽  
Antibacterial And Antifungal Activities ◽  
Antibacterial And Antifungal ◽  
New Compounds

In this work, six complexes (2–7) of Cr(III) and Co(II) transition metals with triazole ligands were synthesized and characterized. In addition, a new ligand, 3,5-bis(1,2,4-triazol-1-ylmethyl)toluene (1), was synthesized and full characterized. The complexes were obtained as air-stable solids and characterized by melting point, electrical conductivity, thermogravimetric analysis, and Raman, infrared and ultraviolet/visible spectroscopy. The analyses and spectral data showed that complexes 3–7 had 1:1 (M:L) stoichiometries and octahedral geometries, while 2 had a 1:2 (M:L) ratio, which was supported by DFT calculations. The complexes and their respective ligands were evaluated against bacterial and fungal strains with clinical relevance. All the complexes showed higher antibacterial and antifungal activities than the free ligands. The complexes were more active against fungi than against bacteria. The activities of the chromium complexes against Candida tropicalis are of great interest, as they showed minimum inhibitory concentration 50 (MIC50) values between 7.8 and 15.6 μg mL−1. Complexes 5 and 6 showed little effect on Vero cells, indicating that they are not cytotoxic. These results can provide an important platform for the design of new compounds with antibacterial and antifungal activities.

scholarly journals Influence of Work and Tool Materials on Parameters of Electrical Discharge Machining (Edm)

1970 ◽  
Vol 3 (1) ◽  
Author(s):  
A.K.M.N. Amin A.K.M.N. Amin ◽  
A.K. Sarder
Keyword(s):  
Electrical Conductivity ◽  
Melting Point ◽  
Recast Layer ◽  
Point Of View ◽  
Machined Surface ◽  
Tool Materials ◽  
Copper Electrodes ◽  
Wear Ratio ◽  
Tool Wear Ratio ◽  
The Given

Influence of the properties of work and tool materials on material removal rate (MRR), tool wear ratio (TWR), thickness of the recast layer, surface roughness and accuracy of machining in EDM process has been investigated. Copper brass, stainless steel, mild steel and grey cast irou have been used in various combinations as work and tool materials. From the experimental results it is found that MRR slows down with machining time. Apart from that it has been found that MRR and TWR are inversely proportional to the melting points of the work and tool materials respectively. Electrical conductivity of the tool material also has appreciable influence on tool wear ratio. Wear ratio was found to be minimum in the case of the copper electrode having maximum electrical conductivity.  It has been also observed that for all combinations of work and tool materials, a recast layer is formed on the machined surface. It has been observed that the micro cavities formed in the cases of lower melting point electrode materials like copper and brass having higher electrical conductivity are comparatively smaller in size (2-3 ?m) as compared to the sizes of the micro cavities (8-20 ?m) formed in the cases of high melting pointer electrodes having also lower electrical conductivity. Consequenty the machined surface roughness produced in the latter cases is higher.  It has been also observed that the debris concentration increases due to side sparking of the electrode. The tendency of debris concentration is the maximum at the middle of the tool-job interface resulting in high bottom surface inaccuracy, specially when high melting point work materials are machined with electrodes like brass having low melting point and relatively lower electrical conductivity. From the point of view of MRR, brass electrodes have been found to be the most suitable tool, but from the point of view of machining accuracy and surface finish copper electrodes were found to yield the best result for the given set of job materials. So it was concluded that brass electrodes should be recommended for rough machining and copper electrodes for finish machining of the given work materials.

The physical properties of anomalous water

1971 ◽  
Vol 24 (4) ◽  
pp. 675 ◽  
Author(s):  
WW Mansfield
Keyword(s):  
Electrical Conductivity ◽  
Surface Tension ◽  
Melting Point ◽  
Aqueous Solutions ◽  
Physical Properties ◽  
Vapour Pressure ◽  
Column Length ◽  
Anomalous Water

The properties of anomalous aqueous condensates, prepared in the manner described by Deryagin,1 vary with aqueous vapour pressure. The changes of column length and of melting point are similar to those of ordinary aqueous solutions. There is no sound evidence that the condensate exhibits abnormal viscosity, density, electrical conductivity, or surface tension.

Improved Electrical Conducting Wires for SOFCs

2008 ◽  
Vol 55-57 ◽  
pp. 797-800
Author(s):  
M. Masomtob ◽  
K. Wongtida ◽  
J. Charoensuk ◽  
S. Charojrochkul
Keyword(s):  
Electrical Conductivity ◽  
Melting Point ◽  
Alternative Energy ◽  
High Electrical Conductivity ◽  
Energy Devices ◽  
Temperature Range ◽  
Electrical Conducting ◽  
Alternative Choice ◽  
Gold Wires ◽  
The Cost

Solid Oxide Fuel Cells (SOFCs) have attracted a number of researchers due to their efficiency as alternative energy devices. Studies have been conducted to investigate different components of the SOFCs to improve the performances. Current collecting wires are the components which have affected the overall performance. Since SOFCs are normally operated in the temperature range of 700-1000 °C in dual atmospheres, the wiring material must be able to function at this condition. Currently, the material used to make the wires is platinum because of its high electrical conductivity, high melting point and oxidation resistant. However, platinum is expensive, especially for the practical operation of SOFCs. Silver could be an alternative choice due to its very high electrical conductivity. Nevertheless, the melting point of silver is rather low (900-960 °C). In our study, a modified silver current collecting wire has been used in the temperature range of 100-1000 °C. Their conductivity curves have demonstrated higher performances in comparison with the systems employing Pt and gold wires. In addition, the cost is reduced approximately 800-1000 times from that of the traditional material used.

scholarly journals A Contribution to the Study of the Glacier Grain

1949 ◽  
Vol 1 (6) ◽  
pp. 320-324
Author(s):  
André Renaud
Keyword(s):  
Electrical Conductivity ◽  
Melting Point ◽  
The Other ◽  
Other Hand ◽  
Glacier Ice ◽  
Glacier Flow

AbstractThe melting of glacier ice always begins at the surface of the glacier grains. A mass of glacier ice at a temperature near its melting point is therefore an aggregate of crystals separated by a film of liquid. The electrical conductivity of ice subjected to differential melting differs considerably according to whether the fractions come from the grain surfaces or from the crystal centres, being much the higher in the former case. It is concluded therefore that the glacier grain consists of a crystal of pure ice with a surrounding film of brine, thus verifying the hypotheses of Buchanan and of Quincke on the formation of natural and artificial ice.The growth of the grain is facilitated by the elimination of the saline skin between neighbouring crystals, the resulting coalescence having the character of autogenous welding. On the other hand, the intergranular film of liquid may act as a lubricant in the as yet inadequately explained mechanism of glacier flow.

scholarly journals A Contribution to the Study of the Glacier Grain

1949 ◽  
Vol 1 (06) ◽  
pp. 320-324 ◽  
Author(s):  
André Renaud
Keyword(s):  
Electrical Conductivity ◽  
Melting Point ◽  
The Other ◽  
Other Hand ◽  
Glacier Ice ◽  
Glacier Flow

Abstract The melting of glacier ice always begins at the surface of the glacier grains. A mass of glacier ice at a temperature near its melting point is therefore an aggregate of crystals separated by a film of liquid. The electrical conductivity of ice subjected to differential melting differs considerably according to whether the fractions come from the grain surfaces or from the crystal centres, being much the higher in the former case. It is concluded therefore that the glacier grain consists of a crystal of pure ice with a surrounding film of brine, thus verifying the hypotheses of Buchanan and of Quincke on the formation of natural and artificial ice. The growth of the grain is facilitated by the elimination of the saline skin between neighbouring crystals, the resulting coalescence having the character of autogenous welding. On the other hand, the intergranular film of liquid may act as a lubricant in the as yet inadequately explained mechanism of glacier flow.

The Electrical Conductivity of Molten Lithium Molybdate

1965 ◽  
Vol 20 (1) ◽  
pp. 102-104 ◽  
Author(s):  
Arnold Kvist ◽  
Arnold Lundén
Keyword(s):  
Electrical Conductivity ◽  
High Temperature ◽  
Melting Point ◽  
Temperature Dependence ◽  
Temperature Modification ◽  
Molten Lithium ◽  
Lithium Molybdate ◽  
High Temperature Modification

The electrical conductivity of Li2MoO4 has been measured on both sides of the melting point in order to see whether this salt has a high temperature modification with properties similar to α-Li2SO4. This was found not to be the case. The temperature dependence of the conductivity was studied for the melt, givingκ= —2.518 + 6.999·10-3 t-1.356·10-6 t2 Ω-1Q-1 cm-1 (704-950°C).There is a discrepancy between our results and recent measurements by MORRIS and ROBINSON. Possible explanations are discussed.

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