VELOCITY DETERMINATIONS BY MEANS OF REFLECTION PROFILES

Geophysics ◽  
1938 ◽  
Vol 3 (4) ◽  
pp. 295-305 ◽  
Author(s):  
C. H. Green
Keyword(s):  
Gulf Coast ◽  
Velocity Profiles ◽  
The Other ◽  
Surface Velocity ◽  
Velocity Measurements ◽  
Indirect Determination ◽  
Texas Gulf Coast ◽  
West Texas ◽  
Field Area

While the idea of making an indirect determination of average sub‐surface velocities by means of reflection profiles is far from new it is nevertheless considered worth reporting, inasmuch as it has been recently employed with fair success by the writer in areas beyond any wells that could be “shot” for direct velocity measurements. Two examples of such surface velocity profiles are described—one located in the Means Field area of Andrews County, West Texas, and the other about 8 miles south of the Refugio Field, in Refugio County on the Texas Gulf Coast.

Supersensitivity of denervated superior cervical ganglion to acetylcholine

1960 ◽  
Vol 198 (5) ◽  
pp. 949-954 ◽  
Author(s):  
Shu Chien
Keyword(s):  
Superior Cervical Ganglion ◽  
The Other ◽  
Nictitating Membrane ◽  
Indirect Determination ◽  
Cervical Sympathetic Trunk ◽  
Cervical Ganglion ◽  
Cervical Sympathetic ◽  
Two Sides

The supersensitivity of denervated superior cervical ganglion to acetylcholine was studied in cats at 2 weeks after the section of cervical sympathetic trunk on one side, with the other side as a control. The control ganglion required about four times as much of acetylcholine as the denervated side, in order to release the same amount of norepinephrine at the postganglionic endings. The relative quantity of norepinephrine released on acetylcholine administration to ganglia was determined indirectly by using the in vivo nictitating membrane as an indicator, whose responses to various doses of norepinephrine had been calibrated. The validity of such indirect determination of norepinephrine was shown by experiments in which the eyeballs were removed or the lever magnifications were made unequal. With control cats in which both cervical sympathetic trunks were cut acutely, the sensitivity of the ganglia on two sides to acetylcholine was almost equal.

Haematotrephus limnodromi n. sp. (Digenea: Cyclocoelidae) from the Long-billed dowitcher, Limnodromus scolopaceus (Scolopacidae) from the central flyway of North America

Zootaxa ◽  
2006 ◽  
Vol 1153 (1) ◽  
pp. 51 ◽  
Author(s):  
NORMAN O. DRONEN ◽  
SCOTT L. GARDNER ◽  
F. AGUSTÍN JIMÉNEZ
Keyword(s):  
North America ◽  
Gulf Coast ◽  
The Other ◽  
Undescribed Species ◽  
Texas Gulf Coast ◽  
University Of Oklahoma ◽  
Air Sacs ◽  
Cheyenne Bottoms ◽  
Limnodromus Scolopaceus ◽  
Central Flyway

During a study of the endohelminths of wading birds from the Texas Gulf coast, 5 specimens of an undescribed species of Haematotrephus (Cyclocoelidae) were studied and described. These specimens were collected by Dr. J. Teague Self, former professor, Department of Zoology, University of Oklahoma, Norman, Oklahoma from the air sacs of a long-billed dowitcher, Limnodromus scolopaceus, that was collected from the Cheyenne Bottoms, Roger Mills County, Oklahoma on August 3, 1963 and deposited in the Manter Laboratory of Parasitology. Haematotrephus limnodromi n. sp. can be distinguished from all the other species in the genus that lack an oral sucker (H. capellae, H. chengi, H. dollfusi, H. fasciatum, H. kossacki, H. lanceolatum, H. longisacculatum, H. nebularium, H. nigropunctatum, and H. phaneropsolus) by having intertesticular uterine loops. Corpopyrum brazilianum (originally described as Cyclocoelum brazilianum) is transferred as the second species in Selfcoelum, Corpopyrum dendrei is transferred to Neohaematotrephus, and Haematotrephus facioi is transferred to Wardianum. This is the first report of a species of Haematotrephus from a species of Limnodromus.

DEPTH PREDICTION FROM VELOCITY PROFILES ON THE TEXAS GULF COAST

Geophysics ◽  
1975 ◽  
Vol 40 (3) ◽  
pp. 388-398 ◽  
Author(s):  
A. F. Woeber ◽  
J. O. Penhollow
Keyword(s):  
Velocity Profile ◽  
Gulf Coast ◽  
Velocity Profiles ◽  
Velocity Range ◽  
Texas Gulf Coast ◽  
Depth Prediction ◽  
Profile Accuracy ◽  
Made In

Velocity profile accuracy in depth prediction in a Texas Gulf Coast area has been statistically estimated by two methods: 1) a comparison of profiles to well surveys; 2) a study of errors in marker horizon depth estimates made in wildcats prior to drilling and in wells that had already been drilled. Both methods point to an accuracy of 1 to 2 percent in 80 percent of the samples at depths ranging from 5000 ft to 12,000 ft. Accuracy fails off fairly rapidly below 12,000 ft, but 50 percent of the samples still exhibit an accuracy of 2 percent or better at 15,000 ft. This accuracy is attributed to the two‐mile spread lengths used, the overall good quality and density of the data, and to the moderate velocity range, 7000 ft/sec to 11,000 ft/sec.

Measurements of attenuation from vertical seismic profiles

Geophysics ◽  
1981 ◽  
Vol 46 (11) ◽  
pp. 1548-1558 ◽  
Author(s):  
Paul S. Hauge
Keyword(s):  
Gulf Coast ◽  
Spectral Ratio ◽  
The Other ◽  
Depth Interval ◽  
Seismic Profiles ◽  
Reference Pulse ◽  
Vertical Seismic Profiles ◽  
West Texas ◽  
A Value ◽  
Resolution Limits

Values of attenuation have been extracted from five detailed velocity surveys. Significant amounts of attenuation are observed in all five wells. Measured values of attenuation vary by a factor of 10, ranging from less than 0.1 to 0.9 dB/wavelength. Correlation of attenuation with lithology is good, considering the resolution limits of the surveys. One of the surveys was performed in West Texas, and the other four were carried out in the Gulf Coast area. The total number of recording depths in each survey varied from 31 to 208, with downhole recordings taken every 10 or 20 ft over key stratigraphic zones. In all five surveys, a monitor geophone was placed near the well to check for source consistency. Our procedure for measuring attenuation involved constructing the spectral ratio between each downhole pulse and one particular reference pulse. A value of cumulative attenuation (CA) was then extracted from each spectral ratio and plotted as a function of geophone depth. This method allowed us to use many measurements in determining the attenuation over each depth interval.

Determination of the lattice translation across {110} APBs in GaAs

1988 ◽  
Vol 46 ◽  
pp. 600-601
Author(s):  
D.R. Rasmussen ◽  
N.-H. Cho ◽  
C.B. Carter
Keyword(s):  
Grain Boundaries ◽  
Lower Energy ◽  
Antiphase Boundary ◽  
The Other ◽  
Boundary Structure ◽  
Interface Plane ◽  
Inversion Symmetry ◽  
High Angle ◽  
Equilibrium Distance

Domains in GaAs can exist which are related to one another by the inversion symmetry, i.e., the sites of gallium and arsenic in one domain are interchanged in the other domain. The boundary between these two different domains is known as an antiphase boundary [1], In the terminology used to describe grain boundaries, the grains on either side of this boundary can be regarded as being Σ=1-related. For the {110} interface plane, in particular, there are equal numbers of GaGa and As-As anti-site bonds across the interface. The equilibrium distance between two atoms of the same kind crossing the boundary is expected to be different from the length of normal GaAs bonds in the bulk. Therefore, the relative position of each grain on either side of an APB may be translated such that the boundary can have a lower energy situation. This translation does not affect the perfect Σ=1 coincidence site relationship. Such a lattice translation is expected for all high-angle grain boundaries as a way of relaxation of the boundary structure.

Determination of the Burgers vector of a dislocation in a Fe-Mn alloy by weak-beam image in HVEM

1978 ◽  
Vol 36 (1) ◽  
pp. 330-331
Author(s):  
Y. Ishida ◽  
H. Ishida ◽  
K. Kohra ◽  
H. Ichinose
Keyword(s):  
High Order ◽  
Simulation Technique ◽  
The Other ◽  
Image Simulation ◽  
Diffraction Vector ◽  
Burgers Vector ◽  
Weak Beam ◽  
Beam Image ◽  
Edge Component

IntroductionA simple and accurate technique to determine the Burgers vector of a dislocation has become feasible with the advent of HVEM. The conventional image vanishing technique(1) using Bragg conditions with the diffraction vector perpendicular to the Burgers vector suffers from various drawbacks; The dislocation image appears even when the g.b = 0 criterion is satisfied, if the edge component of the dislocation is large. On the other hand, the image disappears for certain high order diffractions even when g.b ≠ 0. Furthermore, the determination of the magnitude of the Burgers vector is not easy with the criterion. Recent image simulation technique is free from the ambiguities but require too many parameters for the computation. The weak-beam “fringe counting” technique investigated in the present study is immune from the problems. Even the magnitude of the Burgers vector is determined from the number of the terminating thickness fringes at the exit of the dislocation in wedge shaped foil surfaces.

Procedures for the Quantitative Determination of Autoprothrombin C

1962 ◽  
Vol 08 (03) ◽  
pp. 434-441 ◽  
Author(s):  
Edmond R Cole ◽  
Ewa Marciniak ◽  
Walter H Seegers
Keyword(s):  
Quantitative Determination ◽  
Plasma Sample ◽  
Quantitative Measure ◽  
The Other ◽  
Clotting Time ◽  
Bovine Plasma ◽  
Autoprothrombin C

SummaryTwo quantitative procedures for autoprothrombin C are described. In one of these purified prothrombin is used as a substrate, and the activity of autoprothrombin C can be measured even if thrombin is in the preparation. In this procedure a reaction mixture is used wherein the thrombin titer which develops in 20 minutes is proportional to the autoprothrombin C in the reaction mixture. A unit is defined as the amount which will generate 70 units of thrombin in the standardized reaction mixture. In the other method thrombin interferes with the result, because a standard bovine plasma sample is recalcified and the clotting time is noted. Autoprothrombin C shortens the clotting time, and the extent of this is a quantitative measure of autoprothrombin C activity.

Determination of Factor XIII Activity and of Factor XIII Inhibitors Using an Ammonium-Sensitive Electrode

1983 ◽  
Vol 50 (02) ◽  
pp. 563-566 ◽  
Author(s):  
P Hellstern ◽  
K Schilz ◽  
G von Blohn ◽  
E Wenzel
Keyword(s):  
Factor Xiii ◽  
Normal Subjects ◽  
The Other ◽  
Activity Measurement ◽  
Factor Xiii Deficiency ◽  
Assay Procedure ◽  
Stabilization Factor ◽  
Release Method ◽  
Sensitive Electrode

SummaryAn assay for rapid factor XIII activity measurement has been developed based on the determination of the ammonium released during fibrin stabilization. Factor XIII was activated by thrombin and calcium. Ammonium was measured by an ammonium-sensitive electrode. It was demonstrated that the assay procedure yields accurate and precise results and that factor XIII-catalyzed fibrin stabilization can be measured kinetically. The amount of ammonium released during the first 90 min of fibrin stabilization was found to be 7.8 ± 0.5 moles per mole fibrinogen, which is in agreement with the findings of other authors. In 15 normal subjects and in 15 patients suffering from diseases with suspected factor XIII deficiency there was a satisfactory correlation between the results obtained by the “ammonium-release-method”, Bohn’s method, and the immunological assay (r1 = 0.65; r2= 0.70; p<0.01). In 3 of 5 patients with paraproteinemias the values of factor XIII activity determined by the ammonium-release method were markedly lower than those estimated by the other methods. It could be shown that inhibitor mechanisms were responsible for these discrepancies.

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