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Mathematical

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Spatially Resolved Microrheology Using Localized Coherence Volumes, G. Popescu, A. Dogariu, R. Rajagopalan Jan 2002

Spatially Resolved Microrheology Using Localized Coherence Volumes, G. Popescu, A. Dogariu, R. Rajagopalan

Faculty Bibliography 2000s

We propose an optical technique, based on dynamic light scattering, for investigating the local rheological response of a complex fluid over a frequency range larger than that provided by standard mechanical instrumentation. The low-coherence radiation used in a fiber optics configuration allows the measurements to be confined to a small volume around a tenth of a picoliter. The ability of the method to accurately measure both loss and storage moduli has been tested using both simple Newtonian liquids and viscoelastic, complex fluids. The possibility to monitor liquid-gel transitions in polymer solutions has also been demonstrated. The unique capability of the …

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Test Of An Extended Mathematical Approach To Calculate Maize Leaf Area Index And Leaf Angle Distribution, Elizabeth A. Walter-Shea, Mark A. Mesarch Jan 2001

Test Of An Extended Mathematical Approach To Calculate Maize Leaf Area Index And Leaf Angle Distribution, Elizabeth A. Walter-Shea, Mark A. Mesarch

School of Natural Resources: Faculty Publications

No abstract provided.

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Mathematical Models For Interendothelial Cleft, Bin Chen Jan 2001

Mathematical Models For Interendothelial Cleft, Bin Chen

UNLV Retrospective Theses & Dissertations

Vascular endothelium is the principal barrier to, and regulator of, material exchange between circulating blood and the body tissues. Based on previous research in this field, two new theoretical models have been developed in this thesis. One is to investigate structural mechanisms in the regulation of microvessel permeability by cAMP. The other is to examine the charge effects of surface glycocalyx on microvessel permeability; To investigate the microstructural mechanisms of decreasing microvascular permeability induced by the enhancement of intraendothelial adenosine 3 ',5'-cyclic monophosphate (CAMP) levels, we extended the previous analytical model developed by Fu et al. (1994) for the interendothelial …

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Evidence Of Scattering Anisotropy Effects On Boundary Conditions Of The Diffusion Equation, G. Popescu, C. Mujat, A. Dogariu Jan 2000

Evidence Of Scattering Anisotropy Effects On Boundary Conditions Of The Diffusion Equation, G. Popescu, C. Mujat, A. Dogariu

Faculty Bibliography 2000s

We present experimental evidence that the diffusion process close to the boundary is fundamentally different from the bulk diffusion in the sense that it is affected by the scattering properties of the individual centers. Systematic measurements show a nontrivial behavior of the extrapolation length ratio on the scattering anisotropy of individual particles. The results are compared with other works and are supported by an independent Monte Carlo simulation. A simple analytical model that emphasizes the influence of the last scattering event successfully describes the results.

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Isometries In Three Space And The Seven Solid Crystal Systems, Iris Magee Jan 1995

Isometries In Three Space And The Seven Solid Crystal Systems, Iris Magee

Theses Digitization Project

No abstract provided.

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Mathematical Modeling, Trajectory And Vibrations Control Of A Three Link Flexible Robot, Satish Jupudi Jan 1992

Mathematical Modeling, Trajectory And Vibrations Control Of A Three Link Flexible Robot, Satish Jupudi

UNLV Retrospective Theses & Dissertations

The objective of this thesis is to study the dynamics and control of a three link flexible robot. The Lagrange equations are used for deriving the equations of motion of this three link flexible robot. The equations of motion of this robot are derived by using a mathematical and symbolic manipulation software known as MACSYMA. The vibration mode shapes are approximated by using assumed mode method. A PID 'proportional, integral and differential' controller is used in this system to control the input torques to obtain desired joint angles trajectory. Linear stabilizers are introduced to suppress the vibrations of the links …

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The Effects Of Mathematics Methods Courses On The Mathematical Attitudes, Content Knowledge, And Pedagogical Beliefs Of Preservice Teachers, Robert John Quinn Jan 1991

The Effects Of Mathematics Methods Courses On The Mathematical Attitudes, Content Knowledge, And Pedagogical Beliefs Of Preservice Teachers, Robert John Quinn

UNLV Retrospective Theses & Dissertations

This study investigated the effects of mathematics methods courses on the mathematical attitudes, content knowledge, and pedagogical beliefs of preservice elementary teachers and preservice secondary mathematics teachers. The study was conducted during the fall semester of 1992 at the University of Nevada, Las Vegas. Forty-seven preservice teachers participated voluntarily. Twenty-eight were enrolled in an elementary mathematics methods course; nineteen were enrolled in a secondary mathematics methods course; Attitudes toward mathematics were studied quantitatively by administering Aiken's Revised Attitude Scale on a pretest-posttest basis. The results indicated that the attitude toward mathematics of preservice elementary teachers improved significantly. The attitude toward …

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Two-Dimensional Computer Modeling Of Joints And Fractures In Continua, Royd R. Nelson Dec 1983

Two-Dimensional Computer Modeling Of Joints And Fractures In Continua, Royd R. Nelson

Theses and Dissertations

This thesis presents a numerical formulation which incorporates the effects of joints, cracks, and fractures into a mathematical mode used to in an existing finite element code. Two separate crack definitions were incorporated, one involving a discrete crack model, and the other a continuum approach defining a new material with regularly spaced joints. Several examples are also presented demonstrating the use of this capability.

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Trivalent Gadolinium In Calcium Fluoride, James C. Rawers Jan 1967

Trivalent Gadolinium In Calcium Fluoride, James C. Rawers

Graduate Theses and Dissertations

No abstract provided.

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Absorption Study Of The Energy Levels Of Trivalent Gadolinium In The Barium Fluoride Single Crystalline Lattice, David P. Madacsi Jan 1967

Absorption Study Of The Energy Levels Of Trivalent Gadolinium In The Barium Fluoride Single Crystalline Lattice, David P. Madacsi

Graduate Theses and Dissertations

No abstract provided.

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Unconstitutional Racial Classification And De Facto Segregation, Joseph A. Milchen Mar 1965

Unconstitutional Racial Classification And De Facto Segregation, Joseph A. Milchen

Michigan Law Review

Classification along racial lines, when involving state action, is unconstitutional. Such classification may violate the due process or equal protection clause of the fourteenth amendment or the fifteenth amendment, and it has been held invalid in the fields of education, transportation, voting, recreational facilities, ownership and use of real property, and jury selection.

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Freedom And The Modern Physical World Picture, Th. Graebner Nov 1941

Freedom And The Modern Physical World Picture, Th. Graebner

Concordia Theological Monthly

A discussion of the problem of free will as affected by the new physics cannot claim finality in any sense. The modern world picture is not complete, for one thing, and we are free from agreement on the epistemological background of the doctrine of freedom. Yet the problem of the will remains the most fascinating in philosophy, and the possibilities which modem physics offers towards the solution are arresting enough to deserve more than passing notice. Any serious study of the subject unfortunately involves factors of a subjective nature, which make their results arrived at of little absolute worth. Is …

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Department Of The Interior, Bureau Of Education, Wm. S. Harris Nov 1900

Department Of The Interior, Bureau Of Education, Wm. S. Harris

Reports of the Secretary to the President Student Affairs President’s Correspondence, 1900-1907

Letter concerning the requirements for land-grant colleges of agriculture and mechanic arts.

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