An attempt to express the chemical constant thermodynamically

1933 ◽  
Vol 5 ◽  
pp. 424-426
Author(s):  
V. Njegovan
Keyword(s):  
Chemical Constant

Alkaloids of Buxus sempervirens var rotundifolia BAILLON

1981 ◽  
Vol 46 (6) ◽  
pp. 1425-1432 ◽  
Author(s):  
Le thi Thien Huong ◽  
Zdeno Votický ◽  
Vladimír Paulík
Keyword(s):  
Spectral Data ◽  
Physical Data ◽  
Physico Chemical ◽  
Buxus Sempervirens ◽  
Chemical Constant

Twenty one alkaloids were isolated from the leaves of Buxus sempervirens var rotundifolia BAILLON. Buxaminol-B, cyclobuxine-D, cyclovirobuxine-D, cycloprotobuxine-C, buxamine-E, buxtauine-M and buxpiine-K were those already known. New alkaloids, the constitution and configuration of which were inferred from physical data and corroborated by interconversion and correlation, were denominated buxithienine-M and cyclobuxophylline-O. The remaining bases were characterized by physico-chemical constant and/or spectral data.

scholarly journals Advantages and Disadvantages of using Food Grate Stainless Steel Rods for Internal Fixation of Femoral Transverse Fractures in Rabbits (Review Study)

2020 ◽  
Vol 5 (2) ◽  
pp. 1-7
Author(s):  
Humam H Nazht
Keyword(s):  
Stainless Steel ◽  
Internal Fixation ◽  
Radiological Finding ◽  
Femoral Bone ◽  
Advantages And Disadvantages ◽  
Level Measurement ◽  
Stifle Joint ◽  
Intramedullary Canal ◽  
Chemical Constant ◽  
Transverse Fractures

The present study designed to focus on the advantages and disadvantages of using food grate stainless steel rods (FGSR) as internal fixation methods for induced transverse fractures in the mid shift of the femoral bones in rabbits.200 cases were collected from 2007 to 2020, all these cases were employed to induced transverse fractures in the mid shift of femoral bone, 100 of them used the rods for internal fixation, 80 of the cases used the rods for fixation the natural xen- bony implantation from sheep or calves, and the others 20 cases used the rods for internal fixation of the synthetics nano bony implantation .The physical, chemical, clinical and radiographic parameters were used for evaluation, the physical and chemical analysis showed that the rods not change during sterilization, implantation or when exposed to different types of ray besides the chemical constant is about the same level measurement of the medical intramedullary pins (IMP), while the clinical observation revealed that the rods can used strongly and successfully for fracture fixation and support the animal to bear the weight, the limb used for walking gradually after 24-48 hours p. o. with some cases shown the FGSR pulled from the bone, other suffer from infection with pus formation with lateral deviation of the stifle joint or re-fracture. While the radiological finding revealed that the FGSR insert and fix the fractures fragment and the bony implantation, the pins seemed stable and fit the intramedullary canal and fracture fragments, while some cases shows that the pin not insert properly inside the femoral bone with case of multible and comminuted fractures, other case shown the FGSR pass and penetrate the stifle joint. The conclusion is, there are many advantages with minor or very little disadvantages for using the FGSR as internal fixation of the induced transverse fractures in the mid shift of the femoral bones and for natural and synthetics bony implantation in rabbits.

Note on the Chemical Constant of Chlorine

1925 ◽  
Vol 22 (4) ◽  
pp. 491-492 ◽  
Author(s):  
R. R. S. Cox
Keyword(s):  
Experimental Data ◽  
Good Deal ◽  
Absolute Zero ◽  
Chemical Constant ◽  
The Difference ◽  
Heat Of Dissociation ◽  
Good Agreement

Since the publication of a previous paper on chemical constants, some further experimental data upon the dissociation of chlorine by Wohl have appeared, from which a new and rather more satisfactory value of the chemical constant of diatomic chlorine can be calculated. Wohl concludes that Q0, the heat of dissociation at absolute zero, is – 57,000 calories. This is in good agreement with Henglein's value – 54,000 but differs from that of Trautz and Stackel, namely – 71,000, which is the value adopted in the previous paper. Q0 is necessarily an adjustable constant, and since Wold's value gives results which are a good deal more concordant with each other and with the theory, we now take Q0 = − 57,000. Wohl also uses hv0/k = 902 instead of 1093, but as the difference made by this change is very small compared with other disagreements, we retain the value 1093. The following table gives the new values of Γ (Cl2), calculated in the same way as before. The initials at the heads of the columns refer to the results of Henglein, Trautz and Wohl respectively.

scholarly journals The chemical constant of hydrogen vapour and the entropy of crystalline hydrogen

1931 ◽  
Vol 130 (813) ◽  
pp. 367-379 ◽  
Keyword(s):  
Vapour Pressure ◽  
Low Temperatures ◽  
Hydrogen Gas ◽  
Para Hydrogen ◽  
Bose Statistics ◽  
Hydrogen Molecules ◽  
Quantum Numbers ◽  
A Value ◽  
Classical Statistics ◽  
Chemical Constant

In a paper called "The Chemical constant of Hydrogen Vapour and the failure of Nernst's Heat Theorem," R. H. Fowler has investigated the vapour pressure of hydrogen crystals at low temperature; taking account of the existence of two sorts of hydrogen molecules, namely, ortho-hydrogen with even rotational quantum numbers and para-hydrogen with odd rotational quantum numbers, which retain their individuality over long periods at very low temperatures. By the use of the classical statistics, he was able to show that at very low temperatures hydrogen, as obtained by cooling hydrogen gas from ordinary temperatures, ought to have very nearly the experimentally observed chemical constant. Since the theory of the specific heat of hydrogen yielded correct values at low temperatures, it followed that at ordinary temperatures also his theory would yield a correct value for the chemical constant. Finally from the form of the partition function for hydrogen gas, Fowler attempted to obtain inferences concerning the validity of Nernst's heat theorem. By the use of the classical statistics fairly accurate results were obtained. But we shall find that when we make use of the Einstein-Bose statistics-the correct statistics for an assembly of hydrogen moleclues-a result will be obtained for the vapour pressure of hydrogen crystals at low temperatures which will furnish a value for the chemical constant of hydrogen in even closer agreement with experiment than Fowler's result.

scholarly journals Comparison between Water Hyacinth and Waste Cooking Oils as Source of Biofuel Production

2020 ◽  
pp. 118-125
Author(s):  
Esraa M. Abd El-halim ◽  
Mennatullah M. Moustafa ◽  
Alaa A. Mahmoud ◽  
Hager S. Ahmed ◽  
Emad A. Shalaby
Keyword(s):  
Water Hyacinth ◽  
Biodiesel Production ◽  
Biofuel Production ◽  
Biodiesel Fuel ◽  
Antioxidant Compounds ◽  
Edible Plant ◽  
Waste Cooking Oils ◽  
Chemical Constant ◽  
Cooking Oils ◽  
Chloroform Methanol

The problem of fossil fuel increases by time around the world, Biodiesel is an environmentally friend renewable diesel fuel alternative. The present work aims to determine the possibility for biofuel production from non-edible plant (Water hyacinth) and waste cooking oils in addition to potential uses as source for glycerol, pigments and antioxidant compound sources. this study aimed to investigate the feasibility of biodiesel production from water hyacinth using two solvent systems (chloroform: methanol, 2:1v/v and Hexane), Moreover, WCO applying one steps alkaline transesterification process using methanol, NaOH (0.25) and KOH (0.25, 0.5 and 1g) as a catalyst and hot distilled water for purification. both produced biodiesel (from Eichhornia and WCO) was characterized using FTIR and some chemical constant such as IV, SV and AV. The highest biodiesel produced from Eichhornia recorded with chloroform: methanol system when compared with Hexane. However, the highest biodiesel produced from WCO was recorded when using KOH (0.25g). Also, the obtained results reported the possibility for use glycerol produced from the both biofuel sources in body butter (makhmaria) production, Authors concluded that, the produced biodiesel from both sources was within the recommended standards of biodiesel fuel. Also, water hyacinth became useful in antioxidant compounds production, the contained pigments may be used as natural coloring substances in different fields.

scholarly journals The chemical constant of chlorine vapour and the entropy of crystalline chlorine

1931 ◽  
Vol 131 (817) ◽  
pp. 339-354 ◽  
Keyword(s):  
Gaseous Phase ◽  
Vapour Pressure ◽  
Low Temperatures ◽  
Hydrogen Gas ◽  
The Other ◽  
Ortho Hydrogen ◽  
Bose Statistics ◽  
Hydrogen Molecules ◽  
Classical Statistics ◽  
Chemical Constant

In a recent paper the writer calculated the vapour pressure of hydrogen crystals, using the Einstein-Bose statistics for the gaseous phase. The work was an extension of that of R. H. Fowler, who had used the slightly less accurate classical statistics for the hydrogen gas. In this paper we propose to apply similar methods of investigation to chlorine. The investigation will have to be different in some respects, however. Hydrogen was considered to consist of a mixture of two gases, para- and ortho-hydrogen, which retained their individuality over long periods of time at low temperatures. Due to the existence of two isotopes of chlorine, we shall here have five gases to consider instead of two. Further, hydrogen molecules almost certainly can rotate quite freely in the crystals of hydrogen; on the other hand, molecules of chlorine almost certainly can not rotate at all in crystals of chlorine.

On the “chemical constant”

2010 ◽  
Vol 53 (7) ◽  
pp. 598-606
Author(s):  
K. Posthumus
Keyword(s):  
Chemical Constant
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