Engineering Commons^™

Przebieg Zmienności Stężeń Wybranych Zanieczyszczeń W Gazach Odlotowych Z Procesu Mokrego Gaszenia Koksu, Marian Mazur, Robert Oleniacz, Marek Bogacki

Robert Oleniacz

Continuous measurement results of selected constituent concentrations in the gases emitted to the air during the coke wet quenching process were presented and discussed in the paper. The measurements were carried out for the standard wet quenching tower. The research covered such substances as carbon dioxide, carbon monoxide, hydrogen sulfide, nitrogen oxide, nitrogen dioxide and a total content of hydrocarbons and hydrogen (combustible gases). Changeability of the substance concentrations depending of the quenching process duration was analyzed. Among other things the beginning of these substances formation, appearance of the maximum and the range of observed concentrations were taken into consideration. …

On The Nature Of The Electrochemically Synthesized Hard Fe-0.96 Mass Pct C Alloy Film

A.S. Md Abdul Haseeb

A hard Fe-0.96 mass pet C alloy with a hardness value of 810 HV has been electrochemically synthesized from a ferrous sulfate bath containing a small amount of citric acid and L-ascorbic acid. The nature of the alloy has been investigated by a number of techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Mössbauer spectroscopy, differential scanning calorimetry (DSC), and magnetic measurements. The decomposition behavior of the alloy is also studied and compared with that of thermally prepared martensite. It has been found that the electrochemically deposited Fe-C alloy exists in …

Likwidacja Strefy Ochronnej Huty Katowice I Zakładów Koksowniczych "Przyjaźń" W Dąbrowie Górniczej, Marian Mazur, Robert Oleniacz, Marek Bogacki

Robert Oleniacz

Legislation changes in Poland concerning the protective zones (created around industrial plants particularly harmful to the environment) were presented in the paper. Conditions connected with forming, developing and partial elimination of the protective zone existing around the "Katowice" steelworks and the coke plant Przyjaźń in Dąbrowa Górnicza (Poland) since 1978 were characterized as well.

English title: Elimination of the protective zone of the Katowice steelworks and the coke plant Przyjaźń in Dąbrowa Górnicza.

"Estimación De Variables De Estado De Órbita Satelital Con Filtro De Kalman Extendido", Fabricio I. Salgado, E. Amthauer

Fabricio I. Salgado MSc.

Abstract: this paper presents the formulation of Extended Kalman Filter, Continuous-Discreet case (C-D EKF) and his application to the determination of state of satelite orbit, verifies the performance of the algorithm when it exists a good model for the process and measurement. It is observed the influence of the passage of integration in the estimation and importance that gives to the algorithm to the predictions and measurements.

A Comprehensive Mathematical And Numerical Modeling Of Deep-Bed Grain Drying, Istadi Istadi, Johnner P. Sitompul

Istadi

This paper deals with comprehensive mathematical and numerical modeling of deep-bed grain drying. In order to build the process model, it is necessary to analyze the transport in both grain and gas phases. Experimental works were carried out for a layer of grain bed in order to validate the models. The models consider momentum, energy, and mass conservation within grain and drying air phase. The twodimensional dynamic equations of energy and mass conservation are solved numerically by finite-difference method (FDM) and utilizing alternating direction implicit algorithm within grain and drying air phase, while momentum conservation are solved by finite difference …

A Method For Thermodynamic Work Potential Analysis Of Aircraft Engines, Robert Mcdonald

Robert A. McDonald

The objective of this paper is to provide a tool to facilitate the application of thermodynamic work potential methods to aircraft and engine analysis. This starts with a discussion of the theoretical background underlying these methods, which is then used to derive various equations useful for thermodynamic analysis of aircraft engines. The work potential analysis method is implemented in the form of a set of working charts and tables than can be used to graphically evaluate work potential stored in high-enthalpy gas. The range of validity for these charts is 300 to 36,000 °R, pressures between 0.01 and 100 atm, …

Weryfikacja Emisji Pyłowej Z Huty Katowice I Zasięgu Jej Oddziaływania, Marian Mazur, Robert Oleniacz, Marek Bogacki, Agnieszka Łopata

Robert Oleniacz

Preliminary analysis of the results of atmospheric dispersion modeling for dust emission from the Katowice Steelworks (Poland) showed necessity of verification the particulate matter, lead and cadmium emission from the plant. The verification was limited to the substance emission sources influencing air pollution to the largest extent. Both scale of dust emission and its granulometric and chemical composition were re-evaluated. Further calculations of the air propagation for the pollutants were carried out and calculation results were compared with direct measurements. Thus the Katowice Steelworks impact on air quality and the level of total dust, lead and cadmium ground deposition was …

Specifying And Measuring Aggregate Broadband Noise Of Catv Modulators And Upconverters, Steven I. Rubin, Andre Basovich, Brani Petrovic, Ron D. Katznelson

Ron D. Katznelson

This paper discusses the practical limitations and the subtle assumptions that must be incorporated into the specifications and measurements of Aggregate Broadband Noise of CATV upconverters and digital QAM transmitters. Considerations that govern the accuracy and measurement dynamic range required for such Aggregate Broadband Noise measures are identified. Novel methods involving the separation of the Aggregate Broadband Noise measure into its composites, namely, modulated distortion noise components and other broadband noise components are discussed. Optimal ways in which such measurement techniques have been automated to enable rapid and efficient evaluation of transmitter devices are also presented along with examples of …

Wpływ Związków Metali Alkalicznych W Procesie Spiekania Rud Na Emisję Pyłów, Marian Mazur, Marek Bogacki, Robert Oleniacz

Robert Oleniacz

The work shows the impact of alkali metals in the sintering process on effectiveness of the electrostatic precipitator and dust emissions into the air. The results of analysis of the content of Na and K in dust discharged from the sinter strand and emitted to the air are presented. It was found that this content is subject to large fluctuations and significantly increases in the dust phase after electrostatic precipitators. Using the balance sheet data, the effect of loads of Na2O and K2O compounds contributed to the sinter mix on emissions of dust. It was also observed high variability of …

Response Of Ti-6al-4v And Ti-24al-11nb Alloys To Dry Sliding Wear Against Hardened Steel

A.S. Md Abdul Haseeb

Titanium alloys have been of great interest in recent years because of their very attractive combination of high strength, low density and corrosion resistance. Application of these alloys in areas where wear resistance is also of importance calls for thorough investigations of their tribological properties. In this work, Ti-6Al-4V and Ti-24Al-11Nb alloys were subjected to dry sliding wear against hardened-steel counter bodies and their tribological response was investigated. A pin-on-disc type apparatus was used with a normal load of 15-45N and sliding speed of 1.88 ms -1. In the steady state, it was demonstrated that Ti-24Al-11Nb had a substantially higher …

Statistical Properties Of Composite Distortions In Hfc Systems And Their Effects On Digital Channels, Ron D. Katznelson

Ron D. Katznelson

The statistical properties of Composite Triple Beat (CTB) and Composite Second Order (CSO) distortion terms associated with the analog channels carried on Hybrid Fiber Coax (HFC) are presented. Both simulation and measurement results show that such distortion components falling on individual channels have amplitude Probability Density Function that is nearly Rayleigh distributed (having a Standard Deviation of 5.7 dB). It is shown that both CTB and CSO components have peak envelope power fluctuations that exceed their average (measured) power levels by more than 15 dB. The temporal statistical properties of these distortion components demonstrate peak envelope power fluctuations with characteristic …

How Do Bacteria Interact With Minerals ?, Fathi Habashi

Fathi Habashi

It seems that the rate of dissolution of sulfide minerals by bacterial action is approximately proportional to the solubility product of the sulfide concerned. It can be conceived that the metabolic products of the microorganisms will homogeneously catalyze the oxidation of the sulfide ion generated when the mineral is slurried in water. It is evident that the nearer the microorganism is to the sulfide surface the more effective will be the action of the metabolic products on the sulfide ions, provided that oxygen is available in abundance.

Pattern-Sensitive Deposition For Damascene Processing, M Hussein, A Myers, Charles H. Recchia, S Sivakumar, A Kandas

Charles H Recchia

No abstract provided.

Comparison Of Drip And Sprinkler Irrigation Systems For Applying Metam Sodium And Managing Stem Rot On Potato, G. T. Browne, William R. Detar, Blake M. Sanden, Claude J. Phene

William R DeTar

Drip and sprinkler systems were compared for effectiveness as preplant metam sodium chemigation systems and conduciveness to late-season development of stem rot disease on potato. Sclerotia of Sclerotium rolfsii were used in a bioassay to test efficacy of metam sodium treatments. Drip application of metam sodium (532 liters/ha, 32.8% a.i.) through lines at 7 cm of depth in preformed beds (depths from bed top unless stated otherwise) killed all test sclerotia at 15-, 30-, or 46-cm depths. Drip application of the metam sodium through drip lines at 41 or 46 cm of depth resulted in 0 to 17 or 68 …

Arsenic Content In Groundwater From Aguascalientes City, Mexico, And Risk Evaluation In The Population, Rodolfo Trejo-Vázquez, Adrian Bonilla-Petriciolet

Adrian Bonilla-Petriciolet

Arsenic content in 39 sources of water intended for human use and consumption from Aguascalientes City Mexico, was measured. All sampled wells exhibited an arsenic concentration lower than 0.05 mg/L; the mean concentration was 0.0145 (0.0077 mg/L. Twenty-four wells (61.54%) presented an arsenic concentration higher than EPA and WHO arsenic standards (0.01 mg/L). Arsenic content and geographical information was used to develop an arsenic isopleth map for Aguascalientes's groundwater The minimum and maximum concentrations were used to estimate arsenic exposure doses by the local population. The minimum and maximum mean arsenic exposure doses were 1.06E-04 and 1.81E-03 mg/kg/day respectively. Minimum …

Análisis Del Riesgo Para La Salud Pública Ocasionado Por La Exposición A Fluoruros En El Estado De Aguascalientes, México, Adrian Bonilla-Petriciolet, Rodolfo Trejo-Vázquez, Carlos Márquez-Algara

Adrian Bonilla-Petriciolet

43.7 % of the groundwater wells that provide drinking water for the state of Aguascalientes show fluoride concentrations above 1.5 mg/L. The objective of our research was to perform a risk analysis study to estimate the health implicationsof fluoride exposure through drinking water in Aguascalientes. Fluoride exposure doses were calculated for local population in each of the state municipalities. These estimates were compared with the ingestion limits set by the US Agency for Toxic Substances and Diseases Registry (ATSDR). Based on the existing literature the expected prevalences of dental fluorosis for the exposed people were calculated. Our results show that …

Posible Correlación De Los Contenidos De Arsénico Y Fluoruros En El Agua Potable De La Ciudad De Aguascalientes, México, Rodolfo Trejo-Vázquez, Adrian Bonilla-Petriciolet, Pedro G. Lariz-Durón

Adrian Bonilla-Petriciolet

A study of the concentration of fluoride and arsenic in the drinking water of 39 randomly selected wells in the city of Aguascalientes, and its possible correlation using empiric expressions is reported in this paper. These correlations were obtained when the experimental data were gathered in three categories: wells with a concentration of fluorides between 0.0 and 2.5 mg/l, 2.5 and 4.25 mg/l and 4.25 and 10.0 mg/l. Such empiric expressions modelate the analyzed system with and average error of 11.4%.

The Effective Approach For Recovery Of Methyl-Substituted 1,3-Dioxane From Aqueous Media, Janusz J. Malinowski, Andrew J. Daugulis

Janusz J. Malinowski

The solvent extraction has been successfully applied to the recovery of methyl-substituted 1,3-dioxane from the aqueous reaction media. Aromatic hydrocarbons used as extractants allowed the removal, from the aqueous phase, of up to 75% of dioxane formed in the one stage reactor–extractor. The concept could be included in a downstream separation scheme for the isolation of 1,3-propanediol from a dilute aqueous solution using reversible reaction of the diol with acetalaldehyde.

Using Prior Information In The Structure Selection Of Rbf Network Models, Gladstone B. Alves, Marcelo V. Corrêa

Gladstone B. Alves

No abstract provided.

Searching For Dynamical Resemblance Between Time Series - A Method Based On Nonlinear Autoregressive Models, Gladstone B. Alves, Marcelo V. Corrêa, Viviane C. Silva

Gladstone B. Alves

No abstract provided.

Diagnostic Of Critical Circuits Of Kraft Pulp Production Process Considering The Environmental Aspects, João F. Gomes

João F Gomes

This paper describes systematic work done in the field of atmospheric emissions from Portuguese Kraft pulp mills. This study led to the determination of emission factors from stationary sources that proved to be an important tool to assess the need for investment on air pollution abatement equipment, namely in what concerns mal-odorous gases.

Heat Transfer (Y. Cengel), Alireza Zolfaghari

Dr Alireza Zolfaghari

No abstract provided.

Clinical Investigation: Endoscopic Coronary Artery Bypass Grafting With Robotic Assistance, H. A. Tabaie, W. P. Graper, Jeffrey A. Reinbolt

Jeffrey A. Reinbolt

Background: The current study reviews clinical feasibility experiences evaluating safety and efficacy of using robotic assistance to create a left internal mammary artery to left anterior descending artery (LIMA-to-LAD) anastomosis. Methods: Between August and November 1999, 9 patients (aged 54-73 years) underwent robotically assisted endoscopic coronary artery bypass grafting (E-CABG) after institutional review board approval and informed consent were obtained. The robotics were transthoracically introduced in the fifth and sixth intercostal spaces. The LIMA-to-LAD anastomoses were endoscopically constructed with robotic assistance, and patency was assessed by flow measurement. Results: Each anastomosis was performed robotically, with-out necessity for intraoperative intervention with …

Effective-Medium Theories For Predicting Hydrodynamic Transport Properties Of Bidisperse Suspensions, Ashok S. Sangani, Sangkyun Koo

Ashok S. Sangani

Effective-medium theories for predicting conditionally averaged velocity field and hydrodynamic transport coefficients of monodisperse suspensions are extended to bidisperse suspensions. The predictions of the theory are shown to agree very well with the results of direct numerical simulations of bidisperse suspensions with hard-sphere configurations up to volume fractions at which phase separation in bidisperse hard-sphere systems are observed.

Finite-Weber-Number Motions Of Bubbles Through A Nearly Inviscid Liquid, Ashok S. Sangani, Volodynmyr I. Kushch, Peter D. M. Spelt, Donald L. Koch

Ashok S. Sangani

A method is described for computing the motion of bubbles through a liquid under conditions of large Reynolds and finite Weber numbers. Ellipsoidal harmonics are used to approximate the shapes of the bubbles and the flow induced by the bubbles, and a method of summing flows induced by groups of bubbles, using a fast multipole expansion technique is employed so that the computational cost increases only linearly with the number of bubbles. Several problems involving one, two and many bubbles are examined using the method. In particular, it is shown that two bubbles moving towards each other in an impurity-free, …