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Articles 13531 - 13560 of 14064
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A Note On Daylight Requirement, Wm. Kunerth
A Note On Daylight Requirement, Wm. Kunerth
Proceedings of the Iowa Academy of Science
Two years ago the author read a short paper in which he gave the intensity of illumination required when direct lighting is used as compared with what is required when indirect lighting is employed. Experimental results were given based on the average obtained from 26 college seniors. The data showed that 2.8 ft. candles were desirable for reading by direct lighting and 4.0 ft. candles by indirect lighting, both being median value. Only artificial light was used.
The Differential Death-Rate Of The Sexes Among Animals, With A Suggested Explanation, S. W. Geiser
The Differential Death-Rate Of The Sexes Among Animals, With A Suggested Explanation, S. W. Geiser
Proceedings of the Iowa Academy of Science
It has been conclusively demonstrated in certain mammals, fishes, arthropods, nematodes and mollusks that the female sex has a greater longevity than the male. (Geiser, '21, '23; et al.) Longevity within the species appears to be inherited in the manner of "blending inheritance," i.e., its mode of inheritance is probably through a series of multiple gametic factors. (Beeton & Pearson, '00, '01; Pearl, Parker & Gonzalez, '23; Gonzalez, '23.)
Results Of The Testing Program Given At Iowa State College, Nora M. Klise
Results Of The Testing Program Given At Iowa State College, Nora M. Klise
Proceedings of the Iowa Academy of Science
The results given in this report were based upon a study of 368 Home Economics students who had been given mental tests in the spring and fall of 1919. 145 of the 368 had been given Alpha mental test, and 223, Thorndike. High school records were available for 339 of them. The object was to study criteria for prediction of college scholarship. Alpha had the highest correlation with college average, 0.45 as compared with 0.34 for high school with college average, and 0.38 for Thorndike with college average. English had the highest correlation, with college average (0.59) of any individual …
Three Different Types Of Genetic Sterility In The Parasitic Wasp, Habrobracon, P. W. Whiting
Three Different Types Of Genetic Sterility In The Parasitic Wasp, Habrobracon, P. W. Whiting
Proceedings of the Iowa Academy of Science
Almost complete sterility may be induced by imperfect fertilization. Resulting male offspring very rarely produce daughters which are almost always sterile. Complete sterility of males due to lack of external genitalia exists in one strain, which is reproduced from sisters and fertile brothers. A previously fertile strain mutated so that females lay inviable eggs. Rarely an egg will hatch and from the resulting insect the strain is perpetuated. Males of this strain are of normal fertility.
Two Generations Of Selection With Reference To The Inheritance Of Scurvy Resistance In Guinea-Pigs, W. V. Lambert
Two Generations Of Selection With Reference To The Inheritance Of Scurvy Resistance In Guinea-Pigs, W. V. Lambert
Proceedings of the Iowa Academy of Science
Selection over two generations for increased and decreased resistance to scurvy in guinea-pigs has failed to produce conclusive evidence that the individual variations noted in resistance toward scurvy are inherited. An analysis of the effect of age, weight, and vigor as influencing resistance is presented and it is concluded that these factors, within the limits represented in the data, have not influenced the results. The results for the first generation of selection indicate a pronounced influence, but in the second generation the difference between the minus and plus selections is not significant.
Proceedings Of The Thirty-Eighth Annual Meeting Of The Iowa Academy Of Science, Held At Ames, May 2 And 3, 1924: Minutes Of The Meeting; Staff & Committee Reports
Proceedings of the Iowa Academy of Science
No abstract provided.
Studies On The Role Of Rye In The Vienna Process For Yeast Manufacture, Ellis I. Fulmer, Roma Elmer
Studies On The Role Of Rye In The Vienna Process For Yeast Manufacture, Ellis I. Fulmer, Roma Elmer
Proceedings of the Iowa Academy of Science
A water extract of rye shows an optimum concentration for its effect in causing top growth of yeast. Quantitative studies were reported on the distribution of the yeast throughout a column with various concentrations of the extracts at varying stages in fermentation. Data are discussed relative to the effect of various concentrations of the extract upon the composition of the yeast especially with reference to fat content.
Three Maxims For The Study Of The Nutrition Of Microorganisms, Ellis I. Fulmer
Three Maxims For The Study Of The Nutrition Of Microorganisms, Ellis I. Fulmer
Proceedings of the Iowa Academy of Science
I. The relative potencies of two materials cannot be arrived at by the comparison of the effects of the two materials at equal concentrations. Corollary: The effect of treatment upon the potency of a material cannot be determined by the comparison of the treated and untreated material at equal concentrations. II. The relative potencies of two materials at one temperature may not be true for any other temperature. Corollary: Temperature coefficients for the effect of a material must be determined under optimum conditions for each temperature. III. If two materials are to be compared as a source of a protoplasmic …
The Alumni News Letter, V7n4, October 1, 1923, Iowa State Teachers College
The Alumni News Letter, V7n4, October 1, 1923, Iowa State Teachers College
The Alumni News Letter
Contains news of the College and its alumni.
Iowa State Teachers College Program Of Recitations, Fall 1923, Iowa State Teachers College
Iowa State Teachers College Program Of Recitations, Fall 1923, 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, V7n3, July 1, 1923, Iowa State Teachers College
The Alumni News Letter, V7n3, July 1, 1923, Iowa State Teachers College
The Alumni News Letter
Contains news of the College and its alumni.
The Alumni News Letter, V7n2, April 1, 1923, Iowa State Teachers College
The Alumni News Letter, V7n2, April 1, 1923, Iowa State Teachers College
The Alumni News Letter
Contains news of the College and its alumni.
The Reflecting And The Absorbing Power Of A Photographic Emulsion, P. S. Helmick
The Reflecting And The Absorbing Power Of A Photographic Emulsion, P. S. Helmick
Proceedings of the Iowa Academy of Science
Measurements have been made upon the reflecting and the absorbing power of silver bromide emulsion with wave-lengths between 2100A and 5782A. The reflecting power of silver bromide emulsion averages about 7 per cent for the region 2100A to 5200A. A thickness of emulsion (0.021 mm) as found in a commercial photographic film absorbs about 96 per cent of incident radiation between 5218A and 5782A, and more than 99.99 per cent of radiation whose wave-length is less than 3247 A. From 5782A to at least 2294A the gelatine in a photographic emulsion has a negligible absorption as compared with the absorption …
A New Apparatus For Measuring Deep Water Temperatures, Frank A. Stromsten
A New Apparatus For Measuring Deep Water Temperatures, Frank A. Stromsten
Proceedings of the Iowa Academy of Science
There has always been a certain fascination in the study of things related to great bodies of water. The curiosity to know what is going on beneath the turbulent waves when the storm is raging and what the conditions are beneath the smooth surface when all is quiet has ever challenged our spirit of investigation. What are the environmental conditions of aquatic life has given considerable impetus to the physical and chemical phases of limnology. Temperature seems so closely interwoven into the environmental complex that careful and exact measurement of this factor is one of the first things to be …
A Simple High Frequency Alternator, C. J. Lapp
A Simple High Frequency Alternator, C. J. Lapp
Proceedings of the Iowa Academy of Science
High frequency alternating currents are receiving more attention in physics than ever before. Most of the recent high frequency generating devices have employed vacuum tubes. There are lines of research, however, where mechanical generators are desired.
The Alumni News Letter, V7n1, January 1, 1923, Iowa State Teachers College
The Alumni News Letter, V7n1, January 1, 1923, Iowa State Teachers College
The Alumni News Letter
Contains news of the College and its alumni.
In Memoriam: Gustavus Detlef Hinrichs; James Edward Todd, Charles Keyes
In Memoriam: Gustavus Detlef Hinrichs; James Edward Todd, Charles Keyes
Proceedings of the Iowa Academy of Science
No abstract provided.
Synthetic Hypnotics In The Barbituric Acid Series, Arthur W. Dox
Synthetic Hypnotics In The Barbituric Acid Series, Arthur W. Dox
Proceedings of the Iowa Academy of Science
The increasing demand for sleep-producing drugs is perhaps one of the characteristics of the restless age in which we now live. Not a year passes but half a dozen new synthetic hypnotics appear in the patent literature and a few of these find their way into the drug market. Most of these fail to meet the claims made by the manufacturers and are soon discarded, and the physicians continue to prescribe the eight or ten more or less familiar drugs that have survived several decades of clinical experience. Meanwhile, the chemical and pharmaceutical laboratories continue their search for the ideal …
An Excellent Example Of High Clay Bank Erosion In Lee County, Iowa, Ben H. Wilson
An Excellent Example Of High Clay Bank Erosion In Lee County, Iowa, Ben H. Wilson
Proceedings of the Iowa Academy of Science
There are at least two pre-glacial valleys in Lee County, which is situated in the extreme southeast corner of the state of Iowa, the first running nearly parallel to the present course of the Mississippi, and the other roughly parallel with the valley of the Des Moines. These valleys were once occupied by great mid-continental streams, whose geological age has never been fully determined. Their waters eroded channels several miles in width through the indurated rocks of the Carboniferous, over which they passed, to a depth considerably below the present grade of the water courses with which they are analogous.
New Vibrations Within A Conical Horn, Victor A. Hoersch
New Vibrations Within A Conical Horn, Victor A. Hoersch
Proceedings of the Iowa Academy of Science
In the case of simple harmonic motion, the time factor being eiσt, the velocity potential Φ of the vibrations must satisfy the equation (Δ2 + k2) Φ = 0. Where k = σ /c in which c is the velocity of sound.
Plants And The Surface Film Of Water, Robert B. Wylie
Plants And The Surface Film Of Water, Robert B. Wylie
Proceedings of the Iowa Academy of Science
The plant's uses of water are many. As a solvent water permits the absorption of raw materials of all kinds taken in by the plant. Within the plant body water performs many functions, some of it even entering into the constitution of the protoplasm itself. In leaving the plant in the form of vapor its evaporation cools the tissues when otherwise they might at times be injured by the radiant energy of the sun to which extensive portions of the plant must he exposed for photosynthesis. The familiar root-shoot type of land vegetation is the form-response of plants to the …
The Effect Of Impurities On The Physical Properties Of Oxychloride Cements, H. L. Olin, Ben H. Peterson
The Effect Of Impurities On The Physical Properties Of Oxychloride Cements, H. L. Olin, Ben H. Peterson
Proceedings of the Iowa Academy of Science
The rapidly increasing use of Stucco, a cement made by mixing magnesite with a solution of magnesium chloride, as an exterior for dwelling houses has given rise to an interesting study of its chemical and physical properties. As usually applied, the stucco is made according to the specifications of the Committee on Specifications for Plastic Magnesite, which recommended the following mixture to be standard: One part by weight of plastic calcined Magnesite; Two parts by weight of Standard Ground Silica; Five parts by weight of Standard Ottawa Sand. This is then mixed with a 22 degree Baume solution of magnesium …
1923 Old Gold, Iowa State Teachers College
1923 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.
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.
The Progress Of Research In The Coe College Radiological Laboratory, Scott W. Smith Jr.
The Progress Of Research In The Coe College Radiological Laboratory, Scott W. Smith Jr.
Proceedings of the Iowa Academy of Science
Ever since the discovery of x-rays by Prof. W. K. Röntgen in 1895, the physicist has played an important part in the advancement of knowledge leading to the use of x-rays in therapy. Doctor Coolidge with his high voltage tube made it possible to produce very penetrating x-rays; while Professor Dessauer of Germany in his study of the distribution of x-rays, Professor Duane of Harvard, and many other physicists, have aided materially in the harnessing of this potent form of radiation for use in therapy. Therefore in the establishment of the Radiological Research Bureau of Coe College, the primary aim …
Magnetic And Natural Rotatory Dispersion In Absorbing Media, E. O. Hulburt
Magnetic And Natural Rotatory Dispersion In Absorbing Media, E. O. Hulburt
Proceedings of the Iowa Academy of Science
A theoretical discussion based on the electron theory of H. A. Lorentz yielded formulas for the magnetic rotatory dispersion in isotropic absorbing media and for the natural rotatory dispersion in optically active absorbing media. In a few instances where sufficient data enabled calculation, the new magnetic rotation formula has given accurate agreement with experimental values, thereby accounting for the discrepancy previously noted between the observed Verdet angles and those calculated from a theory which neglected absorption.
The Deflection Of A Stream Of Electrons By Electromagnetic Radiation, E. O. Hulburt
The Deflection Of A Stream Of Electrons By Electromagnetic Radiation, E. O. Hulburt
Proceedings of the Iowa Academy of Science
A theoretical calculation, based on classical electrodynamics, gives for the maximum angular deflection, when certain approximations are made, He/mφ, where ω/2π is the frequency of the radiation, and H is the field due to it. For sunlight (H=.04) the value is only 4 X 10-10, far too small to detect experimentally, while for intense x-rays, the value is of the order of 10-13. Recently C. J. Lapp reported having obtained an observable deflection with x-rays. If further research should confirm this result, it would appear to be in direct conflict with the classical …
Comparative Rates Of Oxygen Consumption In Marine Forms, Francis M. Baldwin
Comparative Rates Of Oxygen Consumption In Marine Forms, Francis M. Baldwin
Proceedings of the Iowa Academy of Science
The present paper presents data gathered by the writer in a study made on the rate of oxygen consumption in some of the marine fishes and invertebrates, and gives additional weight to a report by Professor Scott before the Society of Experimental Biology, XII, pp. 146-147.
Equilibrium Between Strontium Bromide And Bromine In Aqueous Solutions Of Strontium Bromide, J. N. Pearce, J. V. O'Leary
Equilibrium Between Strontium Bromide And Bromine In Aqueous Solutions Of Strontium Bromide, J. N. Pearce, J. V. O'Leary
Proceedings of the Iowa Academy of Science
The study of the equilibrium between bromine and the uni-univalent bromides, more especially potassium bromide, in aqueous solution has been the subject of numerous investigations. It has become a generally accepted idea that an ionizable compound is formed of the type, KBr + Br2 = KBr’ Br2.