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34. Shunsuke Murahashi, Otto Vogl, Mikiharu Kamachi, Koichi Hatada Dec 1997

34. Shunsuke Murahashi, Otto Vogl, Mikiharu Kamachi, Koichi Hatada

Otto Vogl

No abstract provided.


Icris '96: Controlled Organization And Molecular Dynamics Of Polymers, Uji, Kyoto, Japan, Otto Vogl, Masaki Tsuji Dec 1997

Icris '96: Controlled Organization And Molecular Dynamics Of Polymers, Uji, Kyoto, Japan, Otto Vogl, Masaki Tsuji

Otto Vogl

No abstract provided.


Hydrodynamics Of Dispersed Liquid Droplets In Agitated Synthetic Fibrous Slurries, Theodore J. Heindel, Feler Bose, S. Mostafa Ghiaasiaan Nov 1997

Hydrodynamics Of Dispersed Liquid Droplets In Agitated Synthetic Fibrous Slurries, Theodore J. Heindel, Feler Bose, S. Mostafa Ghiaasiaan

Theodore J. Heindel

The hydrodynamic and liquid particle dispersion processes in agitated vessels containing dilute liquid−liquid dispersions, and dilute liquid dispersions in synthetic fibrous slurries, were experimentally studied. A transparent cylindrical vessel 25 cm in height and 15.5 cm in diameter equipped with a six-blade impeller, with geometric proportions representing the standard vessel configuration, was used. The steady-state size distributions of molten wax particles, which constituted 1% by weight of the mixture everywhere, in pure water, and in aqueous slurries with 0.1%, 0.5%, 0.8%, and 1.0% consistencies of nylon fibers, were measured using sampling and microscopic image analyses. The average nylon fiber length …


Japan-Us Seminar: Macromolecular Architecture And Engineering, Otto Vogl, Shin-Ichiro Shoda Nov 1997

Japan-Us Seminar: Macromolecular Architecture And Engineering, Otto Vogl, Shin-Ichiro Shoda

Otto Vogl

No abstract provided.


35. Shigeharu Onogi, Otto Vogl, Masaoki Takahashi, Toshiro Masuda Nov 1997

35. Shigeharu Onogi, Otto Vogl, Masaoki Takahashi, Toshiro Masuda

Otto Vogl

No abstract provided.


36. Qian Renyuan, Otto Vogl, Wu Meiyan Oct 1997

36. Qian Renyuan, Otto Vogl, Wu Meiyan

Otto Vogl

No abstract provided.


37. Masao Horio 1905-1996, Otto Vogl, Masahide Yamamoto Sep 1997

37. Masao Horio 1905-1996, Otto Vogl, Masahide Yamamoto

Otto Vogl

No abstract provided.


38. Hiromichi Kawai, Otto Vogl, Takeji Hashimoto Aug 1997

38. Hiromichi Kawai, Otto Vogl, Takeji Hashimoto

Otto Vogl

No abstract provided.


39. Shu Kambara, Otto Vogl, Seiichi Nakahama Jul 1997

39. Shu Kambara, Otto Vogl, Seiichi Nakahama

Otto Vogl

No abstract provided.


Effect Of Temperature On Wetting Angle, Guna S. Selvaduray, R. Brindos Jul 1997

Effect Of Temperature On Wetting Angle, Guna S. Selvaduray, R. Brindos

Guna S. Selvaduray

No abstract provided.


40. Otto Vogl, Joseph C. Salamone Jun 1997

40. Otto Vogl, Joseph C. Salamone

Otto Vogl

No abstract provided.


41. Akio Nakajima, 1921-1997, Otto Vogl, Toshio Hayashi May 1997

41. Akio Nakajima, 1921-1997, Otto Vogl, Toshio Hayashi

Otto Vogl

No abstract provided.


42. Kenichi Fukui, Otto Vogl, Tetsuki Yamaoka Apr 1997

42. Kenichi Fukui, Otto Vogl, Tetsuki Yamaoka

Otto Vogl

No abstract provided.


43. Karl Kratzl, Otto Vogl Mar 1997

43. Karl Kratzl, Otto Vogl

Otto Vogl

No abstract provided.


44. Vogl Receives Honorary Doctoral Degree From Osaka University, Koichi Hatada Feb 1997

44. Vogl Receives Honorary Doctoral Degree From Osaka University, Koichi Hatada

Otto Vogl

No abstract provided.


Pollutant Atmospheric Emissions From Portuguese Kraft Pulp Mills, João F. Gomes Jan 1997

Pollutant Atmospheric Emissions From Portuguese Kraft Pulp Mills, 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.


Transformation Of Tnt By Aquatic Plants And Plant Tissue Cultures, Joseph B. Hughes, Jacqueline V. Shanks, Mindy Vanderford, John Lauritzen, Rajiv Bhadra Jan 1997

Transformation Of Tnt By Aquatic Plants And Plant Tissue Cultures, Joseph B. Hughes, Jacqueline V. Shanks, Mindy Vanderford, John Lauritzen, Rajiv Bhadra

Jacqueline V. Shanks

The ability of plants to uptake and transform 2,4,6-trinitrotoluene (TNT) was investigated using the aquatic plant Myriophyllum spicatum, axenic Myriophyllum aquaticum, and Catharanthus roseus hairy root cultures. Studies demonstrate that Myriophyllum, with or without its periphyton, and C. roseus transform TNT. Low concentrations of aminated nitrotoluenes (2-amino-4,6- dinitrotoluene and 4-amino-2,6-dinitrotoluene) were observed in the extracellular medium and tissue extracts. Primary products of transformation were not identified, and mineralization was not observed. Mass balances demonstrate that a large percentage of the unknown TNT transformation products were associated with the plant. This fraction could be at least partially recovered from the plant …


Rheology Of Dense Bubble Suspensions, Ashok S. Sangani, Sang-Yoon Kang, Heng-Kwong Tsao, Donald L. Koch Jan 1997

Rheology Of Dense Bubble Suspensions, Ashok S. Sangani, Sang-Yoon Kang, Heng-Kwong Tsao, Donald L. Koch

Ashok S. Sangani

The rheological behavior of rapidly sheared bubble suspensions is examined through numerical simulations and kinetic theory. The limiting case of spherical bubbles at large Reynolds number Re and small Weber number We is examined in detail. Here, Re = p y a^2 / u and We = p y^2 a^3 / s, a being the bubble radius, g the imposed shear, s the interfacial tension, and m and r , respectively, the viscosity and density of the liquid. The bubbles are assumed to undergo elastic bounces when they come into contact; coalescence can be prevented in practice by addition of …


Nusselt Number For Flow Perpendicular To Arrays Of Cylinders In The Limit Of Small Reynolds And Large Peclet Numbers, Ashok S. Sangani, Wei Wang Jan 1997

Nusselt Number For Flow Perpendicular To Arrays Of Cylinders In The Limit Of Small Reynolds And Large Peclet Numbers, Ashok S. Sangani, Wei Wang

Ashok S. Sangani

The problem of determining the Nusselt number N, the nondimensional rate of heat or mass transfer, from an array of cylindrical particles to the surrounding fluid is examined in the limit of small Reynolds number Re and large Peclet number Pe. N in this limit can be determined from the details of flow in the immediate vicinity of the particles. These are determined accurately using a method of multipole expansions for both ordered and random arrays of cylinders. The results for N/Pe^1/3 are presented for the complete range of the area fraction of cylinders. The results of numerical simulations for …


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 Dec 1996

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 …


Calculations Of Thermodynamic Derivative Properties From The Nrtl And Uniquac Models, Yasar Demirel Dec 1996

Calculations Of Thermodynamic Derivative Properties From The Nrtl And Uniquac Models, Yasar Demirel

YASAR DEMIREL

The local composition models NRTL and UNIQUAC with temperature-dependent parameters have been employed to calculate the surfaces of excess heat capacity, excess enthalpy, and thermodynamic factor, F for binary liquid mixtures. These thermodynamic properties represent the derivatives of the models with respect to temperature and composition.


End-Group Effect On Chain Conformation Of Poly(Propylene Glycol) And Poly(Ethylene Glycol), William Macknight, Sunghoe Yoon, Shaw Ling Hsu Dec 1996

End-Group Effect On Chain Conformation Of Poly(Propylene Glycol) And Poly(Ethylene Glycol), William Macknight, Sunghoe Yoon, Shaw Ling Hsu

William MacKnight

No abstract provided.


Thermodynamic Analysis Of Convective Heat Transfer In A Packed Duct With Asymmetrical Wall Temperatures, Yasar Demirel Dec 1996

Thermodynamic Analysis Of Convective Heat Transfer In A Packed Duct With Asymmetrical Wall Temperatures, Yasar Demirel

YASAR DEMIREL

Combination of the first and second law of thermodynamics has been utilized in analysing the convective heat transfer in a rectangular packed duct. Raschig ring type of packing in the air flow passage is used to enhance the heat transfer from uniformly heated front wall to air when the other walls are adiabatic. The packing increases wall to fluid heat transfer considerably, hence reduce the entropy generation due to the heat transfer across a finite temperature difference. However, the entropy generation due to fluid tiow friction increases. The net entropy generations resulting from the above effects provide a new criterior …


Entropy Generation Of Convection Heat Transfer In An Asymmetrically Heated Packed Duct, Yasar Demirel, H.H. Ali, B.A. Abu-Al-Saud Dec 1996

Entropy Generation Of Convection Heat Transfer In An Asymmetrically Heated Packed Duct, Yasar Demirel, H.H. Ali, B.A. Abu-Al-Saud

YASAR DEMIREL

An expression for the volumetric rate of entropy generation has been derived and displayed graphically to analyze the convection heat transfer for a fully established flow in a rectangular packed duct with LAt=I6 and H/W=0.125. The top and bottom walls of the duct are heated by constant, asymmetric heat fluxes, while the other walls are insulated that is the L2 thermal boundary conditions. Entropy generation maps reveal the regions where excessive entropy generation occurs due to physical and geometric parameters for a specified task within the system.


Effective Hybride Adsorbents Of Water Vapour By The Sol-Gel Method, J. Mrowiec-Bialon, A. B. Jarzebski, A. I. Lachowski, Janusz J. Malinowski, Y. I. Aristov Dec 1996

Effective Hybride Adsorbents Of Water Vapour By The Sol-Gel Method, J. Mrowiec-Bialon, A. B. Jarzebski, A. I. Lachowski, Janusz J. Malinowski, Y. I. Aristov

Janusz J. Malinowski

The SiO2/CaCl2 hybrid porous materials were obtained by the two-step hydrolysis and condensation of tetraethoxysilane with (a) replacement of ethanol from alcogel by supercritical CO2 to obtain aerogel morphology and (b) drying alcogel at ambient to obtain xerogel structures. Aerogels and xerogels containing ~17 and ~30 wt % of CaCl2 (dry matter) were prepared and investigated for adsorptivity of water vapor to obtain sorption capacities in excess of 1 kg of water/kg of adsorbate. The adsorbates obtained can be dried and reused. No notable loss in adsorption capacity was observed during 50 cycles.


Thermostability And Esterification Activity Of Mucor Javanicus Lipase Entrapped In Silica Aerogel Matrix And In Organic Solvents, T. Antczak, J. Mrowiec-Bialon, S. Bielecki, A. B. Jarzebski, Janusz J. Malinowski, A. I. Lachowski, E. Galas Dec 1996

Thermostability And Esterification Activity Of Mucor Javanicus Lipase Entrapped In Silica Aerogel Matrix And In Organic Solvents, T. Antczak, J. Mrowiec-Bialon, S. Bielecki, A. B. Jarzebski, Janusz J. Malinowski, A. I. Lachowski, E. Galas

Janusz J. Malinowski

The lipase of Mucor javanicus (now M. circinelloides) entrapped in silica matrix by the sol-gel method esterified primary and secondary alcohols with conversions ranging from 30 to 35% and 10 to 15%, respectively. Loss in activity of the preparations after incubation at 100°C for 1 h with petroleum ether, dodecane, 1-heptanol or oleyl alcohol was about half of that observed for the native lipase.


Morphology Of Silica Aerogels Obtained From The Process Catalyzed By Nh4f And Nh4oh, J. Mrowiec-Bialon, L. Pajak, A. B. Jarzebski, A. I. Lachowski, Janusz J. Malinowski Dec 1996

Morphology Of Silica Aerogels Obtained From The Process Catalyzed By Nh4f And Nh4oh, J. Mrowiec-Bialon, L. Pajak, A. B. Jarzebski, A. I. Lachowski, Janusz J. Malinowski

Janusz J. Malinowski

Twelve samples of silica aerogels were synthesized using different concentrations of catalysts (NH4F,NH4OH), and their morphology was investigated by means of small-angle X-ray scattering (SAXS), N2 adsorption, and transmission electron microscopy. Both SAXS and the nitrogen adsorption method consistently show a different influence of the catalysts; fluoride anions promote formation of a tenuous branched-polymeric structure, with mass fractal dimension Dm = 2.3-2.5, while addition of hydroxyl ions results in a sparser structure (Dm = 2.1-2.2) self-similar over a narrower range. The morphology of aerogels obtained from the process catalyzed by fluoride hydroxide resembles that of aerogels produced by the two-step …