Proceedings, American Philosophical Society (vol. 85, 1942)American Philosophical Society |
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1 - 5 találat összesen 40 találatból.
1. oldal
... units in linear dimension . Interatomic dis- tances are , however , of the order of 1 to 3 Ångström units so that to examine the geometry of the constituent units of molecules it is still necessary to construct and study models made to ...
... units in linear dimension . Interatomic dis- tances are , however , of the order of 1 to 3 Ångström units so that to examine the geometry of the constituent units of molecules it is still necessary to construct and study models made to ...
2. oldal
... units ( 10-8 cm . ) or to approximately 20 atom diameters . To be able to view the individual atoms it would therefore be necessary to improve the resolution still another twenty - fold . X - RAY ANALYSIS OF CRYSTAL STRUCTURE It was in ...
... units ( 10-8 cm . ) or to approximately 20 atom diameters . To be able to view the individual atoms it would therefore be necessary to improve the resolution still another twenty - fold . X - RAY ANALYSIS OF CRYSTAL STRUCTURE It was in ...
3. oldal
... units or quanta of light in other circum- stances . The application of this dualistic con- cept to matter in the early 1920's led to the consideration of matter not only as particulate or atomistic but also as waves and this in its turn ...
... units or quanta of light in other circum- stances . The application of this dualistic con- cept to matter in the early 1920's led to the consideration of matter not only as particulate or atomistic but also as waves and this in its turn ...
4. oldal
... units of Si2O7 , or three in a ring with three common oxygen atoms in a unit Si3O9 , or six in a ring with six common oxygens in a unit SiO18 . This last unit is to be found in the beryl BeзAl2SiO 18- ( c ) It may form endless chains ...
... units of Si2O7 , or three in a ring with three common oxygen atoms in a unit Si3O9 , or six in a ring with six common oxygens in a unit SiO18 . This last unit is to be found in the beryl BeзAl2SiO 18- ( c ) It may form endless chains ...
5. oldal
... unit ( Si , Al ) O , having a resultant negative charge , requiring the incor- poration into the structure of metallic ions . Felspars are of this type and in the zeolites we have a silica - alumina structure so open that the basic ions ...
... unit ( Si , Al ) O , having a resultant negative charge , requiring the incor- poration into the structure of metallic ions . Felspars are of this type and in the zeolites we have a silica - alumina structure so open that the basic ions ...
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Népszerű szakaszok
93. oldal - I presently found that, by means of this lens, air was expelled from it very readily. Having got about three or four times as much as the bulk of my materials, I admitted water to it, and found that it was not imbibed by it. But what surprised me more than I can well express was that a candle burned in this air with a remarkably vigorous flame...
70. oldal - Now I hold it is not decent for a scientific gent To say another is an ass, — at least, to all intent ; Nor should the individual who happens to be meant Reply by heaving rocks at him, to any great extent.
1. oldal - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.
50. oldal - Those who labor in the earth are the chosen people of God, if ever He had a chosen people, whose breasts He has made His peculiar deposit for substantial and genuine virtue.
177. oldal - Were vocabularies formed of all the languages spoken in North and South America, preserving their appellations of the most common objects in nature, of those which must be present to every nation barbarous or civilized, with the inflections of their nouns and verbs, their principles of regimen and concord, and these deposited in all the public libraries, it would furnish opportunities to those skilled in the languages of the old world to compare them with these, now, or at any future time, and hence...
50. oldal - Permit me to avail myself of this opportunity of expressing the sincere grief I feel for the loss of our beloved Rittenhouse. Genius, science, modesty, purity of morals, simplicity of manners, marked him as one of nature's best samples of the perfection she can cover under the human form.
50. oldal - Jersey, prepared an essay on the cultivation of the vine and the making and preserving of Wines, suited to the different climates of North America.
5. oldal - I may be deficient in the other qualifications proper for their service, and to be assured that your testimony cannot go beyond my feelings. Permit me to avail myself of this opportunity of expressing the sincere Grief I feel for the loss of our beloved Rittenhouse. Genius, Science, modesty, purity of morals, simplicity of manners, marked him one of Nature's best samples of the Perfection she can cover under the human form.
171. oldal - Medical and Physical Researches or Original Memoirs in Medicine, Surgery, Physiology, Geology, Zoology, and Comparative Anatomy.
144. oldal - Go, wretch, resign the presidential chair, Disclose thy secret measures, foul or fair. Go, search with curious eye, for horned frogs, Mid the wild wastes of Louisianian bogs; Or, where Ohio rolls his turbid stream, Dig for huge bones, thy glory and thy theme.