The method is based on a combined sorption-elution technique which makes possible the resolving of complex inert gas mixtures into their constituents.

Particularly the recovery of krypton from dilute gas mixtures was accomplished. Recovery efficiencies were as high as ninety-eight percent, while the average krypton purity was better than ninety-nine percent.

]]>Based on the Benedict-Webb-Rubin equation of state, an equation was derived for the deviation of isobaric heat capacity from the ideal gas state. Graphs and tables relating the isobaric heat capacity and the deviation of heat capacity at constant volume to pressure and temperature for nitric oxide are included.

The results show that the effect of pressure on the isobaric heat, capacity must be considered in thermal calculations, since a considerable error is introduced if the pressure effect is neglected. If the effect of pressure is neglected, the greatest error 'would occur near the critical point.

Also included is a comparison of the calculated data with those of Opfell, Schlinger and Sage.

]]>In experiments using para substituted nitro compounds, they found that no chlorination took place except in the case of para-chloronitro-benzene, which, if hydrochloric acid were present during the reaction, gave 2, 4-dichloroacetanilide. In the absence of hydrochloric acid, para-chloroacetanilide was formed.

Careful following of their directions for the reaction with nitrobenzene (simplest of the aromatic nitro compounds) failed to confirm their claim of almost theoretical yields, although the experiment did prove their claim that the only isolated product of the reaction was para-chloroacetanilide in almost pure form (melting point 173-174°C). Repeated experiments following their directions resulted in a yield of approximately ten percent of the theoretical yield.

As a result of the inability to reproduce the results which these authors reported, it was decided to investigate this reaction with a view to determining: the conditions under which the best yield could be obtained; the effect of blocking the position para to the nitro group; the effect of other groups on the benzene ring, in other than the position para to the nitro group; and the effect of two nitro groups on the ring.

]]>The purpose of this paper is to present in graphical form a solution of the equations relating the ratios of the pressure and temperatures in adiabatic flow of compressible fluids to the friction and velocity.

The equations for adiabatic flow of compressible fluids in horizontal ducts of constant cross section have been employed to calculate a series of values of the pressure ratio and the friction at each of several Mach numbers for each of three specific heat ratios. The temperature ratio has also been calculated for each of several mach numbers for each of the three specific heat ratios.

The graphs make it possible to calculate the pressure drop and temperature drop of compressible fluids, in adiabatic flow in horizontal ducts of constant cross section with friction, without resorting to trial and error solution.

The results are presented graphically on pages 9 to 11.

]]>It was found that a great number of alkaloids were also derivatives of the Indole nucleus and hence, could enter into a great many syntheses. The amino acid Tryptophan, which has been found to be extremely important to animal nutrition is a derivative of Indole -- as are also many plant hormones.

We also find Indole being used in the perfume industry to enhance such delicate floral imitations as gardenia, lilac and jasmin.

With this very brief introduction to Indole, we will next consider a synthesis of this important substance and still more important intermediate, although the true pleasure lies in being first to synthesize a compound, it would indeed be folly to even imagine being first to try a synthesis of Indole. The author was naive enough earlier in this investigation to think a new approach was at band; however, a few hours with the literature cast a new and revealing light on the multitude and variety of synthesis already labored over.

The synthesis first to be investigated in this paper is that using O-amino phenyl-ethyl alcohol as the starting material. By first effecting a dehydration cyclization and then a dehydrogenation of the resulting 2,3- dihydroindole, the desired product is formed. A German patent 606,027 dated November 23, 1934 covers a similar investigation - details of which will be given later.

A second synthesis using 2-Hydroxy ethyl aniline and following the same procedure of cyclization by dehydration, then dehydrogenation, is also the subject of the present investigation, but to a much lesser degree than the first method. Unsuccessful attempts in synthesizing the 2-chloro ethyl aniline impeded any progress that might have resulted from this line of investigation.

In conclusion it might be added, that the present revitalized interest in the chemistry of Indoles, served to give the author sufficient impetus to conduct this minor investigation in what might otherwise be considered a fairly well exhausted topic of chemistry.

]]>It is the purpose of this paper to show that all published data in such a system can be correlated by a single equation which differs from those previously presented. Preliminary recalculation of published data indicated that a relationship exists which involves the stirrer width and diameter. Experimental work was undertaken to provide data for determining this relationship.

As a result of this work, the following equation is proposed to correlate heat transfer coefficients on the wall of a jacketed kettle agitated by a paddle type agitator with the fluid and geometric variables:

hT/k = 0.112(cμ/k).44 (D2Np/μ)^{.75} (μ/μ_{w})^{.25}(T/D)^{.40} (D/D_{w})^{.13}

It is believed that this best expresses the data observed by the author. It is further believed to express adequately all previously published data. Without the two groups (T/D) and (D_{w}/D), equations having coefficients ranging from 0.097 to 0.176 were derived. These varying coefficients result from the use of different agitators having different ratios of T/D and D_{w}/D. Without these correlating groups, the limiting equations vary in coefficient by a factor of two. For a given system at any Reynolds number, heat transfer coefficients derived from the limiting equations also would vary by a factor of two.

This is the first paper on this subject to include the terms (T/D) and (D_{w}/D) in such a correlation. This is the first paper to suggest an exponent other than 2/3 for the Reynolds number. This is the first paper to suggest the 0.44 power of the Prandtl number. Brown, Scott and Toyne (22) suggested that this exponent should be 1/4. Uhl (151), however, suggested that it might be greater than 1/3. The -1/4 exponent chosen for the ratio (μ_{w}/μ) is essentially the same as that (-0.24) proposed by Uhl (151).

The results show that ignoring the effect of pressure en the heat capacities of ethane may lead to large errors in engineering calculations. Graphs and tables are presented to permit an evaluation of the heat capacities over the range investigated. Comparisons are made with data of previous investigators, and relative accuracies are discussed.

]]>Under the conditions considered in this paper, prolonged contact of reactants at temperatures above 80°C, a non-crystalline condensation product is obtained in addition to the amine salt.

Attempts to identify this product were unsuccessful. However, in connection with the characterization work, two relatively little known compounds were produced and identified, 4,41-dimethoxybenzophenone and 4,4'-dimethoxy-diphenylmethane.

]]>Modified hypercubes (MHs) have been proposed as the building blocks of hypercube-based systems supporting incremental growth techniques without introducing extra resources for individual hypercubes.

However, processor allocation on MHs proves to be a challenge due to a slight deviation in their topology from that of the standard hypercube network. This thesis addresses the issue of processor allocation on MHs and proposes various strategies which are based, partially or entirely, on table look-up approaches. A study of the various task allocation strategies for standard hypercubes is conducted and their suitability for MHs is evaluated. It is shown that the proposed strategies have a perfect subcube recognition ability and a superior performance. Existing processor allocation strategies for pure hypercube networks are demonstrated to be ineffective for MHs, in the light of their inability to recognize all available subcubes. A comparative analysis that involves the buddy strategy and the new strategies is carried out using simulation results.

]]>The salts were nitrated with mixed acids and the reaction mixtures were treated in various ways to ascertain a good method for isolating the desired 2-nitro-sulfanilic acid (II). An attempt was made to characterize the reaction products, and to devise quantitative methods to estimate the yield of 2-nitrosulfanilic acid. A previously unreported by-product of the nitration, 2,4,6-tri-nitroaniline (He), was isolated. Several new salts of 2-nitrosulfanilic acid were prepared, and a possible new derivative was observed from the reaction of phenanthraquinone and the diamine obtained by the reduction of the nitro group in 2-nitrosulfanilic acid.

Conversion of the 2-nitrosulfanilic acid (II) to 2-nitrophenol-4-sulfonic acid (III) was accomplished by the replacement of the amino group by hydroxyl with boiling alkali, and the rate was estimated from the ammonia evolved.

Reduction of the nitro group with hydrogen gave the desired 2-aminophenol-4-sulfonic acid (IV).

]]>The new viscometer is based cm the principle of concentric rotating cylinders. It is unique in that it can be suspended directly in a polymer batch and will operate under temperature and viscosity conditions as outlined above. Polymerization curves for batches studied show that the instrument gives viscosity values which are reproducible to the extent of +/- 3 percent of the value at 330 to 640 poises.

]]>Proof is presented that the Sulfonic acid group is in the meta position in the benzyl radical.

Ethyl benzyl aniline meta-sulfonic acid is investigated as regards absorption in the ultra violet.

]]>Euclidean distance measurement is used in the compression process which is rotation invarient but is expensive in terms of time. Eucledean distance transformation is calculated using optimal double two scan algorithm with gray scale morphology, a new method developed by Dr. Shih and Mr. Wu. Mathematical morphology provides an effective tool for image analysis. Many parallel image computers support basic morphological operations. A new image segmentation technique is presented, which is more usefull in object recognition as it is invarient to shif, orientation and is proportional to sized images.

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