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Articles 13381 - 13410 of 14081
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The Alumni News Letter, V11n4, October 1, 1927, Iowa State Teachers College
The Alumni News Letter, V11n4, October 1, 1927, Iowa State Teachers College
The Alumni News Letter
Contains news of the College and its alumni.
Summer Term Commencement [Program], August 18, 1927, Iowa State Teachers College
Summer Term Commencement [Program], August 18, 1927, Iowa State Teachers College
UNI Commencement Programs
The program of the commencement ceremonies, including a list of institutional leadership, a list of the departments by college, awards given at the ceremonies, and a list of undergraduate and graduate degree candidates.
Iowa State Teachers College Program Of Recitations, Summer 1927, Iowa State Teachers College
Iowa State Teachers College Program Of Recitations, Summer 1927, Iowa State Teachers College
UNI Schedule of Classes
A listing and schedule of the courses being taught as well as policies and procedures concerning attending classes at the Iowa State Teachers College.
The Alumni News Letter, V11n3, July 1, 1927, Iowa State Teachers College
The Alumni News Letter, V11n3, July 1, 1927, Iowa State Teachers College
The Alumni News Letter
Contains news of the College and its alumni.
Spring Term Commencement [Program], May 31, 1927, Iowa State Teachers College
Spring Term Commencement [Program], May 31, 1927, Iowa State Teachers College
UNI Commencement Programs
The program of the commencement ceremonies, including a list of institutional leadership, a list of the departments by college, awards given at the ceremonies, and a list of undergraduate and graduate degree candidates.
Forty-First Annual Meeting Of The Iowa Academy Of Science, May 6 And 7, 1927, Iowa Academy Of Science
Forty-First Annual Meeting Of The Iowa Academy Of Science, May 6 And 7, 1927, Iowa Academy Of Science
Iowa Academy of Science Documents
No abstract provided.
Iowa State Teachers College Program Of Recitations, Spring 1927, Iowa State Teachers College
Iowa State Teachers College Program Of Recitations, Spring 1927, Iowa State Teachers College
UNI Schedule of Classes
A listing and schedule of the courses being taught as well as policies and procedures concerning attending classes at the Iowa State Teachers College.
The Alumni News Letter, V11n2, April 1, 1927, Iowa State Teachers College
The Alumni News Letter, V11n2, April 1, 1927, Iowa State Teachers College
The Alumni News Letter
Contains news of the College and its alumni.
Winter Term Commencement [Program], March 7, 1927, Iowa State Teachers College
Winter Term Commencement [Program], March 7, 1927, Iowa State Teachers College
UNI Commencement Programs
The program of the commencement ceremonies, including a list of institutional leadership, a list of the departments by college, awards given at the ceremonies, and a list of undergraduate and graduate degree candidates.
Iowa State Teachers College Program Of Recitations, Winter 1926-27, Iowa State Teachers College
Iowa State Teachers College Program Of Recitations, Winter 1926-27, Iowa State Teachers College
UNI Schedule of Classes
A listing and schedule of the courses being taught as well as policies and procedures concerning attending classes at the Iowa State Teachers College.
The Alumni News Letter, V11n1, January 1, 1927, Iowa State Teachers College
The Alumni News Letter, V11n1, January 1, 1927, Iowa State Teachers College
The Alumni News Letter
Contains news of the College and its alumni.
The Relation Between The Photoelectric And The Photographic Effect In Silver Bromide, L. W. Butler
The Relation Between The Photoelectric And The Photographic Effect In Silver Bromide, L. W. Butler
Proceedings of the Iowa Academy of Science
Toy, Edgerton, and Vick have recently shown that the photoelectric effect in silver bromide is due to ultraviolet light of wavelength less than λ 2800A. Since the photographic effect extends to λ 5000A they concluded that there is no relation between the photoelectric and the photographic effects in silver bromide. Before this article appeared, the writer had obtained approximately the same result with silver bromide formed by fuming the surface of a silver plate. Our data was obtained by the use of more sensitive apparatus than that employed by the above named investigators. In order to prevent deterioration of …
A Spectrophotometric Method Of Studying Hemoglobin And Other Colored Substances In Solution, George E. Davis
A Spectrophotometric Method Of Studying Hemoglobin And Other Colored Substances In Solution, George E. Davis
Proceedings of the Iowa Academy of Science
An investigation was carried out to determine the possibilities of applying spectrophotometric methods to the problem of estimating the concentration of hemoglobin in blood. The concentration of a substance in solution can easily be determined from its transmission of some particular wave length, providing the absorption ratio for that wave length is known. A late model direct reading spectrophotometer was used. The method was found to be fairly accurate and simple and should prove valuable in other physical investigations involving the study of spectral transmission curves of various colored substances. Some interesting irregularities in the shape of the spectral transmission …
The Photographic Action Of Irradiated Cod-Liver Oil, Jay W. Woodrow, G. M. Wissink
The Photographic Action Of Irradiated Cod-Liver Oil, Jay W. Woodrow, G. M. Wissink
Proceedings of the Iowa Academy of Science
We have previously reported the results of experiments on the photographic action of irradiated oils. This paper gives the results obtained with various arrangements of the screens and the receptacles for the irradiated cod-liver oil.
The Effect Of Ultaviolet Light On The Dielectric Properties Of Crystals, Albert A. Aardal
The Effect Of Ultaviolet Light On The Dielectric Properties Of Crystals, Albert A. Aardal
Proceedings of the Iowa Academy of Science
Measurements have been made on the dielectric properties of some of the natural crystals, and it has been shown that the values of the constants are changed upon exposure to ultraviolet light. The most important of these properties are dielectric constant, phase angle, and resistance, all of which show this variation when exposed to the short wave-lengths.
1927 Old Gold, Iowa State Teachers College
1927 Old Gold, Iowa State Teachers College
UNI Yearbooks
The student yearbook of the Iowa State Teachers College, later known as the University of Northern Iowa.
A Derivation Of The Solubility Product Law, Warren C. Vosburgh
A Derivation Of The Solubility Product Law, Warren C. Vosburgh
Proceedings of the Iowa Academy of Science
Stieglitz1 pointed out in 1908 that the derivation of the solubility product law based on the application of the law of mass action to strong electrolytes is objectionable. Nevertheless many elementary textbooks still give it. Washburn2 later gave a satisfactory thermodynamic derivation, and Butler3 has more recently given a satisfactory statistical one. Another thermodynamic derivation is possible using the now familiar concepts of free energy and activity.
The Correlation Between Students' Grades In High School And College Physics, Chester King, John Leist
The Correlation Between Students' Grades In High School And College Physics, Chester King, John Leist
Proceedings of the Iowa Academy of Science
This study was undertaken in order to find out to what extent the achievement of a student in college Physics was similar to his achievement in high school Physics. The high school grades for the entire course of Physics were used in comparison to the first semester grades in college Physics. The data covers the records of students who entered college during a period of three years. The total number of students considered was one hundred twenty-one. With this group the formula proposed by Karl Pearson showed the coefficient of correlation to be 0.62. This is considered quite a marked …
An Objective Approach To The Study Of Certain Emotions, Emily Patterson
An Objective Approach To The Study Of Certain Emotions, Emily Patterson
Proceedings of the Iowa Academy of Science
Last year a qualitative and quantitative study of the emotions was made, emphasizing those of fear and startle. On theoretical grounds the emotion which seemed naturally to follow these was surprise, for often the emotion of surprise was closely allied in the introspective reports and in the technical procedure of arousing the several emotions. In the literature little is said about surprise. Almost always it is described as a comparatively mild emotion. Watson does not mention it among his primary emotions and few other authors consider it among the important emotions. In popular literature, however, the word is frequently found …
A Microphotometer For The Study Of Spectograms, I. J. Gwinn
A Microphotometer For The Study Of Spectograms, I. J. Gwinn
Proceedings of the Iowa Academy of Science
A modification of Harrison's microphotometer has been developed, following his suggestion, which is used for accurate measurements of line widths on spectrograms. A vertical optical system using microscope lenses focuses the light on a bismuth-silver thermocouple. Accurate readings of length are obtained with a finely constructed micrometer screw. Studies have also been made on the relative intensities of lines on both optical and X-ray spectrograms. The instrument is also of use in testing the uniformity of thin films of metal.
Thermoelectric Effect In Single Crystals Bismuth, R. W. Boydston
Thermoelectric Effect In Single Crystals Bismuth, R. W. Boydston
Proceedings of the Iowa Academy of Science
Wires of single crystals of bismuth have been prepared by the Czrokalski method. The crystals so far investigated have been of orientations between 10° and 40°. The variations of the thermoelectric properties with orientation is rather slight in bismuth compared with similar effects in zinc as found by Linder, Grüneisen and Goens, and Bridgman.
The Phase-Theory As A Time Theory In Sound Localization, Otis C. Trimble
The Phase-Theory As A Time Theory In Sound Localization, Otis C. Trimble
Proceedings of the Iowa Academy of Science
In a preliminary study of the phenomena of localization by the method of temporal difference of arrival of sound at the two ears, we find results which so nearly coincide with results obtained by Stewart (1) and by Halverson (3) who studied the problem by means of continuous sounds of varying phase relations at the ears, that we feel justified in presenting here the phase-theory as a time-theory in sound localization.
Molecular Space Array In X-Ray Diffractioin Halos In A Liquid: The Case Of Liquid Normal Primary Alcohols: The Cybotatic State, G. W. Stewart, Roger M. Morrow
Molecular Space Array In X-Ray Diffractioin Halos In A Liquid: The Case Of Liquid Normal Primary Alcohols: The Cybotatic State, G. W. Stewart, Roger M. Morrow
Proceedings of the Iowa Academy of Science
For more than a decade (Debye and Scherrer, Nachr. Gesell. Göttingen (1916), p. 6) the X-ray circular diffraction halo in liquids has been known. Doubtless numerous times the suggestion has been made (vide Hewlett, Phys. Rev. 20 (1922), p. 688, and others) that there is in the liquid a spacial arrangement of molecules, probably as fragmentary crystals. But definite evidence of such a structure has been lacking.
Some Errors In The Use Of Physico-Chemical Concepts In Physiology Of Bacteria, R. E. Buchanan
Some Errors In The Use Of Physico-Chemical Concepts In Physiology Of Bacteria, R. E. Buchanan
Proceedings of the Iowa Academy of Science
Several erroneous concepts as to the application of certain of the so called laws of physical chemistry to bacteriology are current in the literature pertaining to the physiology of bacteria.
Photometric Measurements Of The Reflection Factor Of Cotton And Linen Household Materials, Earl C. Mccracken
Photometric Measurements Of The Reflection Factor Of Cotton And Linen Household Materials, Earl C. Mccracken
Proceedings of the Iowa Academy of Science
By means of a specially constructed reflectometer measurements have been made on the variation of the reflection factor with different methods of laundering of both cotton and linen household materials. Results show that the method of washing has a decided effect upon the permanency of the whiteness as indicated by the total reflection factor. It was found that special precautions had to be observed in the taking of this particular type of data.
Measurement Of The Quality Of Water, Jack J. Hinman Jr.
Measurement Of The Quality Of Water, Jack J. Hinman Jr.
Proceedings of the Iowa Academy of Science
If the problem of the measurement of the quality of water were as simple as it was once held in the judicial opinion of the Mississippi jurist Doctor Mason tells about, (1) there would not be the slightest excuse for this paper. It was the opinion of the court that any ordinary mortal could judge for himself whether or not a water was satisfactory for drinking purposes.
The Mode Of Vibration Of The Human Vocal Cords, Wolfgang Metzger
The Mode Of Vibration Of The Human Vocal Cords, Wolfgang Metzger
Proceedings of the Iowa Academy of Science
Observation: Some of the models of the larynx used since the experiments of Johannes Mueller (when observed through the stroboscope) show transverse and alternate vibration. The question arises as to whether this is the mode of vibration of the real vocal cords or whether they rather vibrate synchronously and more in the lateral than in the transverse direction, as was assumed before.
Correlation Of Neatness And Scholarship In Physics, George E. Davis
Correlation Of Neatness And Scholarship In Physics, George E. Davis
Proceedings of the Iowa Academy of Science
353 reports, written by 33 students in three laboratory sections of junior physics, were graded as to neatness. The average neatness grade and the term laboratory grade for each student were used in a correlation study. For each of the three laboratory sections the correlation coefficient was positive. The coefficient for all 33 students was + 0.27. Although the number of students graded was small, we may conclude that in general we may expect neatness and high grades in physics to be associated. Exceptions to the rule and a low correlation coefficient both definitely indicate that neatness of written reports …
The Relation Of Certain Medical And Physical Data To Scholastic Success, Frederic S. Beebee
The Relation Of Certain Medical And Physical Data To Scholastic Success, Frederic S. Beebee
Proceedings of the Iowa Academy of Science
The purpose of this study is to find what factors, if any, in physical development, habits, medical history, medical examination, and physical efficiency are of significance in relation to scholastic standing. It is based on the records of two groups of 1925-1926 male freshmen. The first group was composed of those men receiving the highest grade-point averages in the entire class of nearly 700. The other group was composed of those men in the class receiving the lowest grade-point averages during the same period. The group receiving high averages numbered fifty-two. The group receiving low averages numbered fifty-four. As selected, …
Officers, Past Presidents, And Members, Iowa Academy Of Science
Officers, Past Presidents, And Members, Iowa Academy Of Science
Proceedings of the Iowa Academy of Science
No abstract provided.