Physical Sciences and Mathematics Commons^™

Time-Dependent Ionization Equilibrium And Line Radiation Under Flarelike Conditions, Menas Kafatos, W. H. Tucker

Mathematics, Physics, and Computer Science Faculty Articles and Research

The results of calculations for time-dependent ionization equilibrium and line emission are presented and compared with the values obtained under the assumption that steady-state conditions prevail. In the models considered, it is assumed that the electron density is constant (=10^3 cm^-3) and that the temperature increases by a factor of 10 from 3 x 10^6 K on timescales ranging from 100 to 300 s and decays back to 3 x 10^6 K on a timescale ranging from 600 to 1400 s. Ions of oxygen and silicon are considered, and it is found that the spectrum is softer during the rise …

Les Surfaces Cuticulaires Des Gnathopodes De Deux Crustacés Amphipodes: Niphargus (Gammaridé Hypogé) Et Gammarus (Gammaridé Épigé), Evelyne Sellem

International Journal of Speleology

Niphargus virei and N. schellenbergi (hypogean Gammarids) as also Gammarus pulex pulex (epigean Gammarid) show on the Gn1 and Gn2 of both sexes ornamented areas which were studied with a scanning electron microscope. The ornamentations are built up of teeth. These are simple in Gammarus pulex pulex and present a sexual dimorphism on the meropodite. In N. schellenbergi and N. virei they are as often as not grouped by three. In Orchestia (Talitrid) the teeth have their bases fusioned which forms pectinate scales showing a sexual dimorphism. Outside these areas, the gnathopod cuticle of N. virei, N. schellenbergi and …

The Evolution Of The Eastern North American Isopods Of The Genus Asellus (Crustacea: Asellidae). Part I, Laurence E. Fleming

International Journal of Speleology

This paper is the first in a three part series concerned with the evolution of North American isopods of the genus Asellus. It contains the descriptions of four new species of isopods and a list of pertinent new range data of presently known species.

Biospeologica Sovietica L: Une Nouvelle Espèce Cavernicole De Harpolithobius (Chilopoda, Lithobiidae) Du Caucase, Harpolithobius Birsteini N.Sp., N. T. Zalesskaja

International Journal of Speleology

A new troglobite species belonging to the genus Harpolithobius has been discovered during a recent biological exploration of Caucasian caves; 1 male and 2 females were collected in Avidzba cave and are described here. Harpolithobius birsteini n.sp. is the second troglobiotic Lithobiid known from Soviet caves. The other species collected must be considered as mere troglophilous.

Un Aselle Cavernicole D'Espagne Méridionale: Proasellus Solanasi N.Sp. (Crustacea, Isopoda, Asellota), Jean-Paul Henry, Guy Magniez

International Journal of Speleology

Description of a new, unpigmented and eyeless species of the genus Proasellus Dudich, from an underground stream in the province of Malaga (Southern Spain). It belongs to the phyletic line which gave rise to the modem epigean water-slater Proasellus rneridianus (Racovitza).

Le Cinquantenaire Du Premier Institut De Spéléologie Du Monde, Traian Orghidan

International Journal of Speleology

Description of the activities carried out by the first speleological institute of the world, the Institutul de Spéologie “Emil Racovitza”, founded in 1920 at Cluj in Romania.

Une Nouvelle Espèce Africaine Du Genre Stenasellus (Crustacea Isopoda Asellota) Du Bassin Du Niger, J. A. Birstein

International Journal of Speleology

The representatives of the genus Stenasellus (sensu lato) in Africa have been previously known from Cote d’lvoire, bassin of the Congo and Somali. The new species of this genus was collected from the well in the town Sicascau (Mali). This species differs from all others in the structure of the carpopodites of pereopods II-IV which are enlarged and armed with multiple curved spines. This character shows a distinct sexual dimorphism. In all other features St. laticarpus sp.n. belongs to the group of St. gjorgjevici Rac. and shows the closest resemblance to St. africanus Monod. It is now preferable …

Biométrie Spatiale Dans L'Écosystème Souterrain: Répartition De Meta Menardi Latr. (Argiopidae), R. R. Tercafs

International Journal of Speleology

The spatial distribution of 113 individuals from the species Meta menardi Latr. (Argiopidae) divided in 10 different populations living in 8 Belgian caves has been studied. A grouping test and the calculation of R according to Clark et Evans (1954), based on the measurement of the distance to the nearest neighbour, have been used. Results show that the individuals are distributed at random inside their biotope.

Note On Lepidoptera From Bulgarian Caves, Andrzej W. Skalski

International Journal of Speleology

This paper is a report on Lepidoptera collected in 1960 and 1970 in some caves of the Lakatnik region in the Stara Planina Mts. (Bulgaria). The following species were found: Digitivalva granitella (Tr.), D. pulicariae (Klim.), Thiphosa sabaudiata Dup. and Autophila limbata Stgr. Two species, D. pulicariae (Klim.) and A. limbata Stgr. are new for the cave-fauna and fauna of Bulgaria.

Temperature And Relative Humidity Responses Of Two Texas Cave-Adapted Millipedes, Cambala Speobia (Cambalida: Cambalidae) And Speodesmus Bicornourus (Polydesmida: Vanhoeffeniidae), Eddie Bull, Robert W. Mitchell

International Journal of Speleology

The temperature and relative humidity preferences and tolerances of two Texas species of cave-adapted millipedes, Cambala speobia (Chamberlin) and Speodesmus bicornourus Causey, were studied. Both species showed gross preferences when tested in gradient chambers for temperatures and relative humidities approximating those of their cave environments. But C. speobia, the less adapted species morphologically, was the more selective of the two species for such conditions. S. bicornourus was far less tolerant of elevated temperatures and reduced relative humidities than was C. speobia. Discussed is a possible reason why a terrestrial troglobite like S. bicornourus would combine intolerance with a …

Les Japygidés Cavernicoles De La Faune Française, Jean Pagés

International Journal of Speleology

Twelve species of Japygids are cites from France. Six are known with certitude from caves. None of them shows any morphological modification which can be ascribed to cavernicolous life. All of them are found outside caves except Metaj. doderoi Silv. which is known from a unique female from Castel Mouly cave. To take into account the selection which seems to occur among the species, the term “subtroglophile” is proposed to include those which can be found in the caves.

A New Genus Of Bulgarian Cave Spiders (Protoleptoneta Bulgarica N.G., N. Sp., Leptonetidae), Christo Deltshev

International Journal of Speleology

A new genus Protoleptoneta (P. bulgarica n. g., n. sp.) is described, which was collected in caves of the Western Balkan mountains - Bulgaria. The new genus unites features of the genera Leptoneta and Paraleptoneta but there are many differences, which divide it from these genera. It differs from Leptoneta as follows: the tarsus of male palp does not possess the characteristic apophysa of Leptoneta; the tarsus is less depressed and does not branch out; the teeth of chelicerae are equable and equidistant. It differs from Paraleptoneta as follows: the femora of male palp is spineless; near the …

Etude Comparée Du Comportement Alimentaire De Deux Poissons Cavernicoles (Anoptichthys Jordani Hubbs Et Innes Et Caecobarbus Geertsi Blgr.), Georges Thinès, Nicole Wissocq

International Journal of Speleology

Systematic experiments on the cave-fishes Anoptichthys jordani and Caecobarbus geertsi show that the vertical orientation of swimming behaviour can be significantly modified by feeding the fishes during a period of 8 days before the experiments, either with food dropping to the bottom (Tubifex) or with food floating on the surface of the water (dried Daphnia). The observations have been quantified by recording systematically the position of the fishes in height in an aquarium divided in 3 levels of observation. The position of the fishes was recorded every 10 seconds during a total period of 15 minutes, divided in 3 periods …

Observations Sur Un Aselle Obscuricole De France: Proasellus Racovitzai N.Sp. (Crustacea Isopoda Asellota), Jean-Paul Henry, Guy Magniez

International Journal of Speleology

This paper reports the description of a new species of the genus Proasellus Dudich. Proasellus racovitzai n.sp. is widely depigmented. The eyes are reduced. It lives in the underground stream of the Goueil-di-Her cave system (Haute-Garonne, France). The species is an old, endemic form of the phyletic line of the modern epigean species P. meridianus (Racovitza). Chromosome number of the new species: 2n = 22.

On The Food And Feeding Habits Of Lepidomysis Longipes (Pillai & Mariamma) (Crustacea Mysidacea), C. N. Nath, N. K. Pillai

International Journal of Speleology

The amount of food available to the subterranean mysid, Lepidomysis longipes (Pillai & Mariamma, 1964) in its habitat has been calculated and analysed. Lepidomysis appears to feed mainly on decaying vegetable matter. Lepidomysis shows many modifications in its external morphology. Consequently, the mode of feeding has undergone some marked changes from that of its epigean relatives. L. longipes is a discontinuous feeder.

A Propos Du Stenasellus Laticarpus Birstein (Crustacea Isopoda Asellota), Guy Magniez

International Journal of Speleology

The species Stenasellus laticarpus Birstein is closely related to three west-African Stenasellidae, forming the genus Magniezia Lanza. It belongs to the same genus: Stenasellus laticarpus = Magniezia laticarpa (Birstein).

Deux Stenasellidae Cavernicoles Nouveaux De L'Amerique Centrale: Mexistenasellus Parzefalli N. Sp. Et Mexistenasellus Wilkensi N. Sp. (Crustacea Isopoda Asellota), Guy Magniez

International Journal of Speleology

Description of the females of two new species of the family Stenasellidae (anophthalmous and unpigmented Asellota from underground waters). They were found in a little cave of San-Luis Potosi state (Mexico).

Black Magnetic Spherules From The Glacial And Sea Ice Of Fletcher's Ice Island (T-3), Richard Scattolini

Theses and Dissertations

Black magnetic spherules are particles which can be derived by ablationary processes from cosmic sources. Spherules from both the glacial ice and sea ice of Fletcher's Ice Island (T-3) were studied to determine their size distribution, sedimentation rates, and other parameters. The results were examined and shown to be similar to those of other researchers' work elsewhere.

Calculated sedimentation rates for glacial ice spherules, extrapolated for the entire earth's surface, range from 1.1 x 10⁴ to 1.1 x 10⁵ metric tons per year. Calculated sedimentation rates for sea ice spherules range from 5.0 x 10³ to 1.6 x 10⁵ metric …

Annotated Bibliography Of The Geology Of North Dakota, 1806-1959, Mary Woods Scott

Theses and Dissertations

References to the literature on North Dakota geology published between 1805 and 1960 are listed in this annotated bibliography. Published bibliographies on North American geology, bibliographies on geological subjects important to North Dakota, unpublished lists of references, and references cited in each entry herein were used to compile the bibliography. Each reference is provided with an annotation of its contents. A subject and geographical index and a list of serials cited are included.

Reaction Of Aqueous Catechol Solutions With Minerals, Boonthong Poocharoen

Dissertations and Theses

The effectiveness of catechol, an aromatic vic-diol, in dissolving silicate minerals was studied. A synthetic amorphous magnesium trisilicate, Mg₂Si₃O₈∙5H₂O, as well as the minerals olivine, sepiolite, diopside, augite, and enstatite were used to react with catechol in slightly acidic, basic, and neutral solutions. It was found, depending on the solvent used, that 33-52, 8-17, 14-30, 5-11, 3-6, and 0.5-1 % of the minerals dissolved, respectively.

The reaction with Mg₂Si₃0₈·5H₂0 resulted in the formation of crystals of magnesium tris (catecholato) siliconate nonahydrate Mg[Si(Cat)₃]∙9H₂0. Dehydration of the crystals at room temperature resulted in the loss of 6 moles of water to form …

A Feasibility Study Of Commercial Upland Game Bird Farms In Waterloo County, Ontario, Robert John Mcclure

Theses and Dissertations (Comprehensive)

No abstract provided.

Chesapeake Bay Bibliography - Volume Ii Virginia Waters, Pamela S. Tennyson, Susan O. Barrick, Frank J. Wojcik, William J. Hargis Jr.

Reports

The Chesapeake Bay Bibliography was initiated by the Virginia Institute of Marine Science in response to growing resource management problems of the Chesapeake Bay and its tributaries. With these problems carne the realization that planning and management of such a great natural resource is an overwhelming task requiring the best available information. This bibliography, therefore, was undertaken to document existing sources of information, to help identify research and data gathering needs, and to develop a comprehensive research and information services programs for individuals interested in research on, and management of the natural resources of the Chesapeake Bay region.

This, the …

A Study Of Some Complexometric Titrations In Nonaqueous Solvents, Ngo The Hung

Masters Theses

"Complexometric titrations of calcium, zinc and lead with polyaminocarboxylic acids: ethylenediaminetetraacetic acid (EDTA), 1,2-diaminocyclohexanetetraacetic acid (DCTA), ethyleneglycol-bis(2-aminoethylether)tetraacetic acid (EGTA) and tetraethylenepentamine (tetren) have been investigated and compared in the following organic solvents: methanol, dimethyl formamide, dimethyl sulfoxide and methyl ethyl ketone. Various end point detection methods have been used: direct visual titration with metallochromic indicators and instrumental detection by photometry, potentiometry (mercury electrode and lead ion selective electrode) and amperometry. Calcium, zinc and lead can be determined up to trace levels (ppm) under specific conditions. A concrete application of this thesis is the determination of zinc or calcium in a …

A Geochemical Reconnaissance Of Puerto Rican Beach Sands, Louis Meinecke Iii

Masters Theses

"Twenty-four beach sand samples from the island of Puerto Rico were collected in 1964 by Dr. Ernst Bolter as part of a radiometric survey conducted by him. These samples were given to the author in 1969 for chemical analysis.

The purpose of this investigation was to conduct a geochemical reconnaissance study of the beach sands in order to determine the geochemical background and possible anomalies. This information could aid in offshore mineral exploration and source area determination.

This thesis presents the results of a quantitative chemical analysis for copper, lead, zinc, iron, manganese, aluminum, sodium, potassium, calcium, magnesium, and strontium …

Vibrational Analysis Of Octahedral Molecules, Magdi Aziz Girgis

Archived Theses and Dissertations

No abstract provided.

Stratigraphy And History Of The Sakakawea Sequence, South-Central North Dakota, William B. Bickley Jr.

Theses and Dissertations

The Sakakawea Sequence (Pleistocene) in North Dakota contains six formations that make up the Coleharbor Group (Pleistocene). The Braddock Formation (Wisconsinan) is mainly glacial sediment. The Emmons Formation (late Wisconsinan) is mainly glacial sediment. The Four Bears Formation (Wisconsinan) is mainly either fluvial or lacustrine sediment. The Coteau Formation (Holocene) is mostly fluvial, colluvial, or slough sediment. The Denbigh Formation (Holocene) is mostly eolian sediment. The Oahe Formation (late Wisconsinan and Holocene) is mostly eolian sediment (loess) The Oahe Formation is divided into three members: the Mallard Island (late Wisconsinan), Aggie Brown (latest Wisconsinan to earliest Holocene), and Riverdale (middle …

Geology Of Southern Nelson County, North Dakota, Roger J. Reede

Theses and Dissertations

Southern Nelson County occupies 576 square miles in northeastern North Dakota (Twps. 149-152 N., Rgs. 57-62 W.). Its surface is mantled with glacial drift resting unconformably on the Cretaceous Pierre Shale, which is exposed along the Sheyenne River Valley and the Stump Lake Basin. The entire mantle of glacial drift is part of the Coleharbor Formation, which, in southern Nelson County, averages 45 feet thick with a maximum thickness over 200 feet. Drill-hole data and missile site excavations provide good evidence for the existence of multiple drift sheets, including layers of till separated by more than 25 feet of outwash, …

Inner Shelf Sediments Off Chesapeake Bay. I - General Lithology And Composition, Maynard M. Nichols

Reports

The sedimentary materials and bottom topography of more than 2400 square miles of the inner continental shelf floor north off the Chesapeake Bay entrance have been surveyed for potential mineral resources. Sediments consist of two principal types: (1) fine sand and (2) medium to coarse sand. The fine sand is grey-colored, subrounded, rich in quartz and relatively 11clean 11 and well sorted. The medium-coarse sand is typically iron-stained, rich in shell and poorly sorted. The fine sand covers inner parts of the shelf floor whereas medium to coarse sand covers seaward parts. Additionally, shell-rich medium to coarse sand occurs on …

Asymptotic Behavior Of Solutions Of Lu=G(T,U,Dots,U^(K-1)), William F. Trench

William F. Trench

No abstract provided.

Stability Of A Class Of Discrete Minimum Variance Smoothing Formulas, William F. Trench

William F. Trench

No abstract provided.