Physical Sciences and Mathematics Commons^™

Compact Compacts: Models: A Simple (And Tasty) Model For Electron Clouds, John T. Moore

Faculty Publications

A simple (and tasty) model for demonstrating the electron cloud concept; and a classroom visualization of ethylene II and II* molecular orbitals.

Chemistry Of Low-Valent Molybdenum Phosphite Complexes: Models Of Seven-Coordinate Reaction Intermediates, E. L. Muetterties, J. F. Kirner, W. J. Evans, S. Abdel-Meguid, I. Tavanaiepour, V. W. Day

Chemistry Department: Faculty Publications

A simple synthesis of the zerovalent complex Mo[P(OCH₃)₃]₆ has been devised from a potassium reduction of MoCI₄(tetrahydrofuran)₂ followed by reaction with trimethyl phosphite at 70°. Protonation of this octahedral complex gave only low yields of the expected seven-coordinate hydride, HMo[P(OCH₃)₃]₆+. The major product was an octahedral nonhydridic cation, Mo[P(OCH₃)₃]₅P(OCH₃)₂+, derived from proton cleavage of the P─O phosphite ester bond. This octahedral cation was stereochemically nonrigid, apparently through facile methoxy group migration. Close packing by methoxy groups …

Regulation Of Protein Synthesis In Rabbit Reticulocyte Lysates By The Heme-Regulated Protein Kinase: Inhibition Of Interaction Of Met-TrnaFMet Binding Factor With Another Initiation Factor In Formation Of Met-TrnaFMet.4os Ribosomal Subunit Complexes, R. S. Ranu, I. M. London, A. Das, A. Dasgupta, A. Majumdar, R. Ralston, R. Roy, N. K. Gupta

Chemistry Department: Faculty Publications

Protein synthesis in reticulocytes and their lysates is regulated by heme. In heme deficiency a heme-regulated translational inhibitor (HRI) that blocks initiation of polypeptide chains is activated. HRI is a protein kinase (ATP: protein phosphotransferase, EC 2.7.1.37) that specifically phosphorylates the 38,000-dalton subunit of the Met-tRNA_f^Met indin factor (IF), which forms a ternary complex with Met- tRNA_f^Met and GTP, a finding that suggests that the inhibition by HRI involves the phosphorylation of IF. We have investigated the effect of HRI in the partial reactions of protein chain initiation in which the IF-promoted binding of Met-tRNA_{f …}

A Revision Of The Comatulid Genus Comactinia A. H. Clark (Crinoidea: Echinodermata), Charles G. Messing

Marine & Environmental Sciences Faculty Articles

The formerly monotypic genus Comactinia is found to comprise two valid species. One of these is further divided into two subspecies. The variability of the genus is examined and illustrated. A discussion of ecology, affinities, and zoogeography is included.

Note On The Constant Coupling Approximation, M. Jursich, Harry A. Brown

Physics Faculty Research & Creative Works

No abstract provided.

In Situ Intercalation Of Tas2 In The Electron Microscope, G. Tatlock, Juana Acrivos

Faculty Publications, Chemistry

Electron diffraction had been used to study the formation of a variety of complex superlattices in the 1T, 2H and 4Hb polytypes of TaS2 during intercalation with hydrazine gas (N2H4), in situ in the electron microscope. Results are presented over the temperature range 15K-360K and are interpreted in terms of scattering from periodic lattice distortions linked to charge density waves. Comparisons are also made with similar effects in both the as-grown crystals and the TaS2 samples containing other adducts.

A Class Of Group Divisible Designs, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

No abstract provided.

On Skew Hadamard Matrices, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

Recently I have proved that for every odd integer q there exists integers t and s (dependent on q) so that there is an Hadamard matrix of order 2tq and a symmetric Hadamard matrix with constant diagonal order 2s q2. We conjecture that "for every odd integer q there exists an integer t (dependent on q) so that there is a skew-Hadamard matrix of order 2tq”. This paper makes progress toward proving this conjecture. In particular we prove the result when q = 5 (mod 8) = s2 + 4r2 is a prime power and all orthogonal designs of type …

Generation Of A Frequency Square Orthogonal To A 10 X 10 Latin Square, H C. Kirton, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

In general it is a difficult if not impossible task to find a latin square orthogonal to a given latin square. Because of a practical problem it was required to find a frequency square orthogonal to a given latin square. We describe a computer approach which was successful in finding a (4,23) frequency square orthogonal to a given 10 x 10 latin square.

Comprehensive Plan For Fish And Wildlife On Nebraska National Forest System Lands

Nebraska Game and Parks Commission: Publications

Wildlife and fish are integral and functional parts of forest and grassland environments. Application of this plan should improve and maintain habitats, as well as the types and populations of wildlife species within them. Various types of habitat manipulation are effective means of improving such environments to produce a diversified and sustained supply of wildlife. and fish. Direct habitat improvement and coordination with other resource management programs will be used to help realize the management objectives as they concern lands under Forest Service administration. However, this plan is not a "recipe book," requiring specified ingredients or actions. Rather it provides …

The Mcconaughy Rainbow...Life History And A Management Plan For The North Platte River Valley, Rodney C. Van Velson

Nebraska Game and Parks Commission: Publications

McConaughy Reservoir and the North Platte River drainage upstream to the Nebraska-Wyoming state line represent a major part of the coldwater habitat in Nebraska, 87%, according to the 1972 Nebraska Fish and Wildlife Plan (Figure 1). The plan also showed the upper North Platte River drainage contains 159 miles of coldwater stream habitat and 192 miles of mixed cold and warm water stream habitat, 29 percent of the total mileage in the state. Together, these 351 miles account for 80 percent of the coldwater stream acreage in Nebraska.

McConaughy Reservoir and the North Platte River drainage rainbow trout fishing attracts …

Comparison Of The Fisher's Method Of Randomization With Other Tests Based On Ranks And The F-Test, Francisco J. González

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Classical statistical inference methods (parametric methods) have a common denominator, i.e. a population para meter (μ, o, n) about which we wish to draw inferences from a random sample. R) are selected. Point estimators of the parameters (X, S, Their sampling distribution is used to construct hypothesis testing decision rules or, confidence interval formulas. This is the reason for calling this method of obtaining inferences a parametric method. They are based on knowing the distribution of the population random variable from which the sampling distribution of the point estimator is determined. In addition, it is generally assumed that the population, …

Approximation By Discrete Operators, J. J. Swetits, B. Wood

Mathematics & Statistics Faculty Publications

A discrete, positive, weighted algebraic polynomial operator which is based on Gaussian quadrature is constructed. The operator is shown to satisfy the Jackson estimate and an optimal version is obtained.

Design And Construction Of An Inexpensive Anechoic Chamber, Charles E. Hughes Jr.

Journal of the Arkansas Academy of Science

No abstract provided.

Two-Step Photoionization Of Potassium Atoms, Kaare J. Nygaard, Robert J. Corbin, James A. Jones

Physics Faculty Research & Creative Works

The cross section for photoionization of potassium atoms in the 4P2 states has been measured in a triple-crossed-beam experiment. © 1978 The American Physical Society.

Production Of Cl⁻·Hcl Cluster Ions In Hcl-N2 Mixtures, R. J. Corbin, Kaare J. Nygaard, William R. Snow, Laird D. Schearer

Physics Faculty Research & Creative Works

A drift-tube-mass-spectrometer apparatus has been used to study the production of Cl-·HCl cluster molecules in HCl-N2 mixtures. The concentration of HCl was 730 ppm and the total pressure ranged from 0.1-5 Torr. The primary ion Cl- is produced mainly by dissociative attachment of HCl and is converted to a cluster ion in a three-body collision. The rate of formation of the cluster ion is k2≃ 10-25 cm6/sec at E/N=12 Td. © 1978 American Institute of Physics.

Geochemistry Of A Carbonatite In Montgomery County, Arkansas, George H. Wagner, Ronald H. Konig, Michael D. Jones

Journal of the Arkansas Academy of Science

No abstract provided.

Structural Geology Of The Brentwood-St. Paul Area, Northwest Arkansas, Mikel R. Shinn

Journal of the Arkansas Academy of Science

Photogeologic and field mapping of a 530 mi² area in southeastern Washington and southern Madison Counties, Arkansas, indicates that post-Atoka structural deformation occurred primarily through differential uplift of basement fault blocks. Northeast and east trending basement faults and fracture systems are present. Northeast trending features are related to the major fracture systems of the stable continental interior. They were initiated by shearing during Pre-Cambrian time and have subsequently acted as crustal zones of weakness along which mostly vertical movement has occurred. East trending basement faults may have originally developed as a result of tension between the stable Ozark uplift and …

The Dryland Salinity Problem In North America, P R. George

Journal of the Department of Agriculture, Western Australia, Series 4

North america also has a dryland salinity problem although the source is different.

Absolute Doubly Differential Cross Sections For Ejection Of Secondary Electrons From Gases By Electron Impact. Ii. 100-500-Ev Electrons On Neon, Argon, Molecular Hydrogen, And Molecular Nitrogen, R. D. Dubois, M. Eugene Rudd

M. Eugene Rudd Publications

Absolute doubly differential cross sections for secondary electron production by electron impact have been measured for static gas targets of neon, argon, hydrogen, and nitrogen. Electron impact energies were from 100 to 500 eV. An electrostatic analyzer was used to analyze secondary electrons with energies between 4 eV and the primary electron energy minus the first ionization potential of the target. Angles of emission were 10° to 150°. The present data agree well with the data of Opal, Beaty, and Peterson at 90° but, as was observed previously for helium, the agreement becomes increasingly poorer for larger and smaller angles. …

Western Australian Soils Store Large Quantities Of Salt, C V. Malcolm, R. A. Nulsen, C. Henschke

Journal of the Department of Agriculture, Western Australia, Series 4

Enormous quantities of salt are stored in the soil in the agricultural areas of Western Australia. Small movements in this salt can produce large effects on farms.

Wildlife Habitat In The James River Valley, South Dakota, L. Paul Schneider

Electronic Theses and Dissertations

A wildlife habitat inventory was conducted on the 12 485 ha study area of the James River floodplain in north-eastern South Dakota. Included were vegetation mapping, small mammal trapping, waterfowl breeding pair counts, waterfowl brood counts, bird census routes, and general observations. Natural vegetation consisted of 3181 ha of grassland, 2002 ha of woodland, 1115 ha of savannah, and 392 ha of marshland. Small mammal trapping revealed low densities of mostly white-footed mice (Peromyscus spp.). No vegetation type was more valuable to small mammals than any other. Waterfowl breeding pairs, mostly mallard, blue-winged teal, and wood duck, numbered 244 in …

Protein Synthesis In Rabbit Reticulocytes: Characteristics Of A Ribosomal Factor That Reverses Inhibition Of Protein Synthesis In Heme-Deficient Lysates, R. O. Ralston, A. Das, A. Dasgupta, R. Roy, S. Palmieri, N. K. Gupta

Chemistry Department: Faculty Publications

A ribosomal salt (0.5 M KCI) wash factor (RF) that reverses inhibition of protein synthesis in heme-deficient reticulocyte lysates has been resolved from the bulk of Met-tRNA_t^met- binding factor (EIF-1), Co-EIF-I, and EIF-2 (ternary complex dissociation factor, TDF). The purified RF restores protein synthesis activity of heme-deficient lysates to the level observed in the presence of hemin. No direct correlation exists between amount of EIF-i activity and ability to reverse inhibition of protein synthesis in heme-deficient lysates. Homogeneous preparations of EIF-i are completely inactive in reversal of protein synthesis inhibition in heme-deficient lysates. These findings suggest that …

Dialectics And Catastrophe, Martin Zwick

Systems Science Faculty Publications and Presentations

The three classical principles of Hegelian and Marxist dialectics, (1) the transformation of quantity into quality, (2) the unity and struggle of opposites, and (3) the negation of negation, can be modeled with the Catastrophe Theory of Renép Thorn and E. C. Zeeman, especially with the ‘elementary catastrophes’ known as the cusp and the butterfly.

Generalized Connectors, Nicholas Pippenger

All HMC Faculty Publications and Research

An $n$-connector is an acyclic directed graph having $n$ inputs and $n$ outputs and satisfying the following condition: given any one-to-one correspondence between inputs and distinct outputs, there exists a set of vertex-disjoint paths that join each input to the corresponding output. It is known that the minimum possible number of edges in an $n$-connector lies between lower and upper bounds that are asymptotic to $3n\log _3 n$ and $6n\log _3 n$ respectively. A generalized $n$-connector satisfies the following stronger condition: given any one-to-many correspondence between inputs and disjoint sets of outputs, there exists a set of vertex-disjoint trees that …

Movement And Migration Patterns Of Red-Winged Blackbirds: A Continental Overview, Richard A. Dolbeer

United States Department of Agriculture Wildlife Services: Staff Publications

From 1924 through 1974, about 11,000 recoveries accumulated from the banding of over 700,000 Red-winged Blackbirds(Agelaius phoeniceus) in North America. A few studies have examined some of these data for specific localities during certain times of the year; however, no attempt has been made to examine the total recovery data to compile a general picture of continental movement and migration patterns. Increasing attention is being given to blackbird (Icteridae) and Starling (Sturnus vulgaris) populations in North America because of their reported crop depredations, health hazards, and nuisance aspects, especially when congregating in large roosts (Meanley,1975;Graham, 1976). Solutions to these problems …

Studies Of The Temporary Anion States Of Unsaturated Hydrocarbons By Electron Transmission Spectroscopy, Kenneth D. Jordan, Paul Burrow

Paul Burrow Publications

The concept of occupied and unoccupied orbitals has provided a useful means for visualizing many of the most important properties of molecular systems. Yet, there is a curious imbalance in our experimental knowledge of the energies of occupied and unoccupied orbitals. Whereas photoelectron spectroscopy has provided a wealth of data on positive ion states and has established that they can be associated, within the context of Koopmans’ theorem, with the occupied orbitals of the neutral molecule, the corresponding information for the negative ion states, associated with the normally unoccupied orbitals, is sparse. In part this reflects the experimental difficulties connected …

Developmental Dyslexia: Evidence For A Subgroup With A Reversal Of Cerebral Asymmetry, Daniel B. Hier, Marjorie Lemay, Peter B. Rosenberger, Vincent P. Perlo

Chemistry Faculty Research & Creative Works

The Computerized Brain Tomograms of 24 Patients with Developmental Dyslexia Were Analyzed for Cerebral Asymmetry. Ten Patients Showed a Reversal of the Pattern of Asymmetry Regularly Observed in Normal Right-Handed Individuals So that the Right Parietooccipital Region Was Wider Than the Left. the Ten Dyslexic Patients with This Reversal of Cerebral Asymmetry Had a Lower Mean Verbal IQ Than the Other 14 Dyslexic Patients in This Study. the Reversal of Cerebral Asymmetry that Occurred in Ten of the Dyslexic Patients May Result in Language Lateralization to a Cerebral Hemisphere that is Structurally Less Suited to Support Language Function and Thus …

Mechanism Of The Ninhydrin Reaction, Carey B. Bottom, Samir B. Hanna, Donald J. Siehr

Chemistry Faculty Research & Creative Works

No abstract provided.

Progress On Rock Glacier Research, John F. Shroder Jr., John R. Giardino

Geography and Geology Faculty Publications

This report is an account of research progress on rock glaciers of Afghanistan, Colorado, and Utah. Because of the preliminary nature of this work, some speculation is present; nevertheless, we think there is evidence for each major, new point expressed. The main thesis of our work is that rock glaciers are polygenetic and appear to be part of a continuum of similar landforms grading morphologically and, presumably, mechanically from one type to another type.