Physical Sciences and Mathematics Commons^™

What Is A Prime Number?, Stan Wagon, D. Schattschneider, R. Mabry

Stan Wagon, Retired

No abstract provided.

Constructing Essential Laminations In 2-Bridge Knot Surgered 3-Manifolds, Ramin Naimi

Ramin Naimi

A nontrivial knot that can be drawn with only two relative maxima in the vertical direction is called a 2-bridge knot, and one that can be drawn on a torus is called a torus knot. Loosely speaking, a lamination in a manifold M is a foliation of M, except that it can have a nonempty open complement in M, and very loosely speaking, the lamination is essential if each leaf of it L is incompressible, i.e. inclusion of L into M induces an injective homomorphism from π1(L) into π1(M). Our main result is: Theorem 2. Every 3-manifold obtained by surgery …

Supportability Analysis Of Repairable Systems With Parallel Configurations, Caroline Lubert, J. Knezevic

Caroline P Lubert

No abstract provided.

Is There Environmental Racism? The Demographics Of Hazardous Waste In Los Angeles County, J. Boer, Manuel Pastor, James Sadd, Lori Snyder

James Sadd

The article assesses the location of treatment, storage and disposal facilities (TSDF) in Los Angeles County, California, with focus on racism. The study shows that a simple comparison of tracts with and without TSDF reveals statistically significant differences by race and economic status along the lines suggested by the environmental justice proponents. There are also significant differences by industrial land use and manufacturing employment along the lines suggested by critics of the environmental justice concept. In this multivariate model race, along with industrial land use and employment in manufacturing, remains a factor, rising income that has a positive then a …

The Aeroacoustics And Aerodynamics Of High-Speed Coanda Devices: Part 2. Effects Of Modifications For Flow Control And Noise Reduction, Caroline Lubert, P. Carpenter

Caroline P Lubert

No abstract provided.

A Bayesian Approach To Bivariate Nonparametric Regression, Michael Smith, Robert Kohn

Michael Stanley Smith

No abstract provided.

Direct Measurement Of Diffuse Double-Layer Forces At The Semiconductor/Electrolyte Interface Using An Atomic Force Microscope, Kai Hu, Fu-Ren F. Fan, Allen J. Bard, Andrew C. Hillier

Andrew C. Hillier

The forces between a silica probe and an n-type TiO2 single-crystal electrode were measured using an atomic force microscope in an aqueous electrolyte solution. These interactions were a strong function of the solution pH, the presence of specifically adsorbed anions, and the TiO2 electrode potential. For a series of pH values, a strong electrostatic repulsion was seen at high pH and decreased as the pH was reduced. At pH values below 5.5, the interaction became attractive. A series of force measurements between SiO2 and n-type TiO2 showed a repulsive interaction when TiO2 was held at negative electrode potentials, which transformed …

Econometric Estimation Of Foresight: Tax Policy And Investment In The U.S., Douglas G. Steigerwald, Charles Stuart

Douglas G. Steigerwald

We develop a method for measuring the foresight agents have. We first dichotomize an agent's information at current date t into knowledge up to date t+f and expectations after t+f. We then form a residual-based test statistic that allows us to compare prediction errors for econometric models based on different values of f. We illustrate the method, examining investment around tax reforms to measure the foresight firms have about tax policy. In this illustration, current investment appears to reflect currently available information but little foresight other than foresight of enacted policy changes.

An Alternative Dunford-Pettis Property, Walden Freedman

Walden Freedman

Numerical Solution Of The Inverse Eigenvalue Problem For Real Symmetric Toeplitz Matrices, William F. Trench

William F. Trench

No abstract provided.

Internal Forces In Nondegenerate 2d Electron Systems, Christopher Fang-Yen, M Dykman, M Lea

Christopher Fang-Yen

No abstract provided.

A Nonlinear Deformed Su(2) Algebra With A Two-Color Quasitriangular Hopf Structure, Andrei Ludu

Andrei Ludu

No abstract provided.

Asymptotic Bias For Quasi-Maximum Likelihood Estimators In Models With Conditional Heteroskedasticity, Douglas G. Steigerwald, Whitney Newey

Douglas G. Steigerwald

Virtually all applications of time-varying conditional variance models use a quasi-maximum likelihood estimator (QMLE). Consistency of a QMLE requires an identification condition that the quasi-log-likelihood have a unique maximum at the true conditional mean and relative scale parameters. We show that the identification condition holds for a non-Gaussian QMLE if the conditional mean is identically zero or if a symmetry condition is satisfied. Without symmetry an additional parameter, for the location of the innovation density, must be added for consistency. We calculate the efficiency loss from adding such a parameter under symmetry, when the parameter is not needed. We also …

An Analysis Of Surface Area Estimates Of Binary Volumes Under Three Tilings, Erik G. Learned-Miller

Erik G Learned-Miller

In this paper, we first review local counting methods for perimeter estimation of piecewise smooth binary figures on square, hexagonal, and triangular grids. We verify that better perimeter estimates, using local counting algorithms, can be obtained using hexagonal or triangular grids. We then compare surface area estimates using local counting techniques for binary three-dimensional volumes under the three semi-regular polyhedral tilings: the cubic, truncated octahedral, and rhombic dodecahedral tilings. It is shown that for surfaces of random orientation with a uniform distribution, the expected error of surface area estimates is smaller for the truncated octahedral and rhombic dodecahedral tilings than …

Aphasic Sentence Comprehension As A Resource Deficit: A Computational Approach, Henk J. Haarmann, Marcel Adam Just, Patricia A. Carpenter

Marcel Adam Just

No abstract provided.

Mathematical Instantons With Maximal Order Jumping Lines, Prabhakar Rao

Prabhakar Rao

Nonlinear Liquid Drop Model. Cnoidal Waves, Andrei Ludu

Andrei Ludu

No abstract provided.

Emisja Zanieczyszczeń Ze Spalania Odpadów Ściekowych W Piecu Półkowym, Robert Oleniacz, Marian Mazur, Marek Bogacki

Robert Oleniacz

The article presents incineration tests of silty-tar sludge produced in the wastewater treatment plant for coke industry. Sewage sludges were incinerated in a full-scale multiple hearth incinerator equipped with a wet flue-gas cleaning system (alkaline scrubber). Measurements of air pollutant emissions were carried out both before and after the cleaning system. The obtained results allow to conclude that the thermal utilization of sewage sludge in this type of installation might be just a little cumbersome for the environment, using the appropriate equipment for the purification of exhaust gases. The paper also specifies minimum exhaust gas cleaning performance that guarantees compliance …

Wdrażanie Monitoringu Zanieczyszczeń Powietrza Atmosferycznego W Kielcach, Marian Mazur, Robert Oleniacz, Marek Bogacki

Robert Oleniacz

Assumptions for regional environmental monitoring in the province of Kielce were developed as early as 1992. Since the beginning of particular attention were monitoring the air. The article presents the next step in the implementation of this monitoring, associated with verification of the location and the measuring range of points to measure the concentrations of air pollutants in Kielce. As a result of analysis and calculations, it was found that the original location is not always correct and does not reflect the spatial differentiation of pollutant concentrations. The proposed changes in the position of monitoring points or measurement methods were …

Zastosowanie Metody Obliczeniowo-Pomiarowej Do Oceny Stanu Zanieczyszczenia Powietrza W Nowym Sączu, Marian Mazur, Marek Bogacki, Robert Oleniacz

Robert Oleniacz

Assessment of the state of air pollution in the urban area is a difficult and complex task. Depending on the method of assessment the procedure requires a comprehensive research and calculations of air emissions from all sources occurring in the area and the use of atmospheric dispersion models or large-scale implementation of direct measurements of air pollutant concentrations. Both of these methods may also be applied simultaneously to their mutual verification.

The article presents the results of such a comprehensive assessment of air pollution on the example of the city of Nowy Sacz (Poland). This involved determining the emissions of …

Obliczanie Emisji Par Węglowodorów Z Przemysłu Rafineryjnego, Marian Mazur, Robert Oleniacz, Marek Bogacki

Robert Oleniacz

The negative effects of the refining industry for ambient air quality is mainly related to emissions of hydrocarbon vapors. Calculation methodology and estimates, the level of emissions from several years has been the research subject of many institutions and environmental agencies, including The Oil Companies’ European association for health, safety and environment in refining and distribution (CONCAWE) and American Petroleum Institute (API).

The article describes the main sources of emissions of hydrocarbons occurring in a typical refinery. In summary form also shows how to calculate the volume of a mixture of hydrocarbons emissions from these sources based on empirically validated …

Badania Emisji Chlorowodoru I Związków Fluoru Podczas Spalania Odpadów Niebezpiecznych, Marian Mazur, Robert Oleniacz, Marek Bogacki

Robert Oleniacz

The paper presents the results of measurements of the concentration of hydrogen chloride (HCl) and fluoride compounds (as HF) in raw and purified combustion gases discharged from the incineration of selected hazardous wastes. The study included two installations operating on an industrial scale: a multiple hearth furnace and a rotary kiln incinerator equipped with a single wet flue gas cleaning systems. In the multiple hearth furnace was being incinerated sludge from coke industry. In the rotary kiln were being incinerated coal (coke) tars, contaminated cleaning rags, sawdust, used gloves, outdated pharmaceuticals and medicines, hospital waste, waste paints, varnish and lubricant, …

Emisja Zanieczyszczeń Ze Spalania Odpadów Farmaceutycznych I Poszpitalnych W Piecu Obrotowym, Robert Oleniacz, Marian Mazur, Marek Bogacki

Robert Oleniacz

The work presents the problem of management and thermal treatment of medicines and hospital wastes and investigation results of incineration of these waste in the full-scale rotary kiln with wet gas cleaning equipment (alkaline scrubber). On the basis of measurements of air pollutant concentrations in combustion gases, maximum dose of these wastes in the feed to the kiln was specified in order to ensure a relatively low stack emissions using the hypothetical high-efficiency flue-gas treatment system.

English title: Pollutant emissions from incineration of pharmaceutical and hospital waste in a rotary kiln.

Emisja Zanieczyszczeń Ze Spalania Odpadów Przemysłowych W Piecu Obrotowym, Robert Oleniacz, Marian Mazur, Marek Bogacki

Robert Oleniacz

The paper presents the results of measurements of the concentration of selected pollutants in the flue gases from the incineration of industrial wastes in a full-scale rotary kiln. The study included three waste mixtures introduced into the kiln: 1) coal tar waste (tar origin of coke); 1) waste paints, varnish and lubricant; 3) resin and rubber waste. The article also assesses the effectiveness of the existing wet flue gas cleaning system (alkaline scrubber) and specifies minimum exhaust gas purifying performance guarantees compliance with European emission standards for waste incineration.

English title: Pollutant emissions from incineration of industrial waste in a …

Coarsening And Persistence In The Voter Model, E. Ben-Naim, L. Frachebourg, P.L. Krapivsky

Eli Ben-Naim

No abstract provided.

Auroral Electrojet Irregularity Theory And Experiment: A Criticalreview Of Present Understanding And Future Directions, J. D. Sahr, Bela G. Fejer

Bela G. Fejer

We review the experimental observations of meter scale plasma irregularities in the auroral E region and the status of their theoretical understanding. Most of the experimental data is derived from VHF radar scatter experiments, but sounding rockets also provide crucial information not obtainable from radars. Linear theories correctly predict the altitude of occurence, strong magnetic aspect sensitivity, marginal instability, and typical phase velocities. Subsequent nonlinear theories have been developed to account for other observed features but with less satisfying application. Further understanding of auroral electrojet irregularities is impeded by precision limitations of existing instruments, by radar data which may seem …

International Symposium On Macromolecular Architecture, Otto Vogl, Jane C. Vogl, Tatsuki Kitayama

Otto Vogl

No abstract provided.

Polymer Science In Vietnam, Otto Vogl, Dang Van Luyen, Dang Mai-Huong

Otto Vogl

No abstract provided.

45. Minoru Imoto, Otto Vogl, Tatsuro Ouchi

Otto Vogl

No abstract provided.

Emisja Związków Siarki Z Procesu Wielkopiecowego, Marian Mazur, Marek Bogacki, Robert Oleniacz

Robert Oleniacz

The paper describes the problem of the presence of sulfur in the blast furnace process and identifies emission sources of sulfur compounds in this process. On the basis of the measurements and calculations, the types and quantities of these compounds emitted to the air were determined. It was found that pig iron smelting in a blast furnace causes emissions of COS, SO2 and H2S. These emissions occur by losses of blast furnace gas (COS and SO2), transport of blast furnace slag inside the furnace hall (SO2) and treatment of the slag by granulation (H2S). However, the most important are only …