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Impact Of Internals On The Heat-Transfer Coefficient In A Bubble Column, Rahman S. Abdulmohsin, Muthanna H. Al-Dahhan Feb 2012

Impact Of Internals On The Heat-Transfer Coefficient In A Bubble Column, Rahman S. Abdulmohsin, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

The Effect of Heat Exchanging Internals on the Heat-Transfer Coefficient Has Been Investigated in a 0.19 M Diameter Bubble Column. an Air-Water System Was Used with Superficial Gas Velocities Varying from 3 to 20 Cm/s, Which Cover Both the Bubbly and Churn-Turbulent Flow Regimes. Internals Occluding 0% (Empty Column), 5% (Simulating Methanol Synthesis), and 22% (Simulating Fischer-Tropsch Synthesis) of the Column Cross-Sectional Area Were Implemented. a Fast Response Heat-Transfer Probe Was Utilized to Measure the Radial Profile of the Heat-Transfer Coefficient in the Fully Developed Flow Region. the Results Indicate that the Presence of a High Percentage of Internals Causes …


State-Selective Electron Transfer And Ionization In Collisions Of Highly Charged Ions With Ground-State Na(3s) And Laser-Excited Na *(3p), I. Blank, Sebastian Otranto, C. Meinema, Ronald E. Olson, R. Hoekstra Feb 2012

State-Selective Electron Transfer And Ionization In Collisions Of Highly Charged Ions With Ground-State Na(3s) And Laser-Excited Na *(3p), I. Blank, Sebastian Otranto, C. Meinema, Ronald E. Olson, R. Hoekstra

Physics Faculty Research & Creative Works

Single electron transfer and ionization in collisions of N5+ and Ne8+ with ground state Na(3s) and laser excited Na *(3p) are investigated both experimentally and theoretically at collision energies from 1 to 10 keV/amu, which includes the classical orbital velocity of the valence electron. State-selective partial cross sections are obtained using recoil-ion momentum spectroscopy in combination with a magneto-optically cooled Na atom target. a strong dependence of the cross sections on the collision energy is observed. in general, both the relative magnitude and the energy dependence are found to be in good agreement with classical-trajectory Monte Carlo calculations. …


Timely Tidbits, Feb. 17, 2012, Library And Learning Resources Feb 2012

Timely Tidbits, Feb. 17, 2012, Library And Learning Resources

Timely Tidbits

No abstract provided.


Faculty Senate Minutes February 16, 2012, Missouri University Of Science And Technology Faculty Senate Feb 2012

Faculty Senate Minutes February 16, 2012, Missouri University Of Science And Technology Faculty Senate

Minutes & Agendas

No abstract provided.


The Missouri Miner, February 16, 2012 Feb 2012

The Missouri Miner, February 16, 2012

The Missouri Miner Newspaper

No abstract provided.


Influence Of Solid-Phase Wall Boundary Condition On Cfd Simulation Of Spouted Beds, Xingying Lan, Chunming Xu, Jinsen Gao, Muthanna H. Al-Dahhan Feb 2012

Influence Of Solid-Phase Wall Boundary Condition On Cfd Simulation Of Spouted Beds, Xingying Lan, Chunming Xu, Jinsen Gao, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

The Influence of Solid-Phase Wall Boundary Condition in Terms of Specularity Coefficient and Particle-Wall Restitution Coefficient on the Flow Behavior of Spouted Beds Was Investigated using Two-Fluid Model Approach in the Computational Fluid Dynamics Software FLUENT 6.3. Parametric Studies of Specularity Coefficient and Particle-Wall Restitution Coefficient Were Performed to Evaluate their Effects on the Flow Hydrodynamics in Terms of Fountain Height, Spout Diameter, Pressure Drop, Local Voidage and Particles Velocity. the Numerical Predictions Were Compared with Available Experimental Data in the Literatures to Obtain the Suitable Values of Specularity Coefficient and Particle-Wall Restitution Coefficient for Spouted Beds. the Simulated Results …


Timely Tidbits, Feb. 10, 2012, Library And Learning Resources Feb 2012

Timely Tidbits, Feb. 10, 2012, Library And Learning Resources

Timely Tidbits

No abstract provided.


The Missouri Miner, February 9, 2012 Feb 2012

The Missouri Miner, February 9, 2012

The Missouri Miner Newspaper

No abstract provided.


The Missouri Miner, February 2, 2012 Feb 2012

The Missouri Miner, February 2, 2012

The Missouri Miner Newspaper

No abstract provided.


Foraging Alters Resilience/Vulnerability To Sleep Disruption And Starvation In Drosophila, Jeffrey Donlea, Averi Leahy, Matthew S. Thimgan, Yasuko Suzuki, Bryon N. Hughson, Marla B. Sokolowski, Paul J. Shaw Feb 2012

Foraging Alters Resilience/Vulnerability To Sleep Disruption And Starvation In Drosophila, Jeffrey Donlea, Averi Leahy, Matthew S. Thimgan, Yasuko Suzuki, Bryon N. Hughson, Marla B. Sokolowski, Paul J. Shaw

Biological Sciences Faculty Research & Creative Works

Recent human studies suggest that genetic polymorphisms allow an individual to maintain optimal cognitive functioning during sleep deprivation. If such polymorphisms were not associated with additional costs, selective pressures would allow these alleles to spread through the population such that an evolutionary alternative to sleep would emerge. To determine whether there are indeed costs associated with resiliency to sleep loss, we challenged natural allelic variants of the foraging gene (for) with either sleep deprivation or starvation. Flies with high levels of Protein Kinase G (PKG) (forR) do not display deficits in short-term memory following 12 …


Phenomenological Thermodynamic Potential For Catio₃ Single Crystals, Yijia Gu, Karin Rabe, Eric Bousquet, Venkatraman Gopalan, Long-Qing Chen Feb 2012

Phenomenological Thermodynamic Potential For Catio₃ Single Crystals, Yijia Gu, Karin Rabe, Eric Bousquet, Venkatraman Gopalan, Long-Qing Chen

Materials Science and Engineering Faculty Research & Creative Works

The antiferrodistortive (AFD) structural transitions of calcium titanate (CaTiO3) at ambient pressure have been extensively studied during the last few years. It has been found that none of the AFD polymorphs is polar or ferroelectric. However, it was recently shown theoretically and later experimentally confirmed that a ferroelectric transition in CaTiO3 can be induced by tensile strains. The ferroelectric instability is believed to be strongly coupled to the AFD soft modes. In this paper, we present a complete thermodynamic potential for describing the coupling between the AFD and ferroelectric phase transitions. We analyzed the dependence of transition …


Heat Transfer Coefficients In Mimicked Fischer-Tropsch Slurry Bubble Columns, Chengtian Wu, Muthanna H. Al-Dahhan Feb 2012

Heat Transfer Coefficients In Mimicked Fischer-Tropsch Slurry Bubble Columns, Chengtian Wu, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

To Provide More Support for Fischer-Tropsch (FT) Slurry Bubble Column Reactor Design, Scale-Up, and Performance, the Effects of Operating Conditions on the Heat Transfer Coefficients Were Investigated in a Mimicked FT Cold Flow System (Compressed Air:C 9-C 11:FT Catalyst Carrier). the Studied Operating Conditions Varied in Superficial Gas Velocity (Up to 0.3 M/s), Pressure (Up to 10 Bar), and Solids Concentration (Up to 25 Vol %). the Effects of These Variables on Heat Transfer Coefficients Are Discussed and Analyzed. the Increase in Pressure Tended to Reduce the Heat Transfer Coefficient, While the Increase in Solids Loading Enhanced the Heat Transfer …


Localizability Of Tachyonic Particles And Neutrinoless Double Beta Decay, Ulrich D. Jentschura, Benedikt J. Wundt Feb 2012

Localizability Of Tachyonic Particles And Neutrinoless Double Beta Decay, Ulrich D. Jentschura, Benedikt J. Wundt

Physics Faculty Research & Creative Works

The quantum field theory of superluminal (tachyonic) particles is plagued by a number of problems, which include the Lorentz non-invariance of the vacuum state, the ambiguous separation of the field operator into creation and annihilation operators under Lorentz transformations, and the necessity of a complex reinterpretation principle for quantum processes. Another unsolved question concerns the treatment of subluminal components of a tachyonic wave packet in the field-theoretical formalism, and the calculation of the time-ordered propagator. After a brief discussion on related problems, we conclude that rather painful choices have to be made in order to incorporate tachyonic spin-1/2 particles into …


Study Of Turbulence-Radiation Interaction In Hypersonic Turbulent Boundary Layers, L. (Lian) Duan, M. P. Martín, A. M. Feldick, M. F. Modest, D. A. Levin Feb 2012

Study Of Turbulence-Radiation Interaction In Hypersonic Turbulent Boundary Layers, L. (Lian) Duan, M. P. Martín, A. M. Feldick, M. F. Modest, D. A. Levin

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Direct numerical simulations are conducted to investigate the effect of turbulence-radiation interaction in hypersonic turbulent boundary layers, representative of the Orion crew exploration vehicle at the peak heating condition during reentry. Both the effects of emission and absorption are considered by solving the radiative transfer equation using the tangent slab approximation and a spectral model with line-by-line accuracy. Nondimensional governing parameters to measure the significance of turbulence-radiation interaction are proposed, and the direct numerical simulation fields with and without radiation coupling are used to assess turbulence-radiation interaction. Is it found that the fluid medium within the boundary layer is optically …


Artificially Disordered Birefringent Optical Fibers, Sumudu Herath, N. P. Puente, Elena I. Chaikina, Alexey Yamilov Feb 2012

Artificially Disordered Birefringent Optical Fibers, Sumudu Herath, N. P. Puente, Elena I. Chaikina, Alexey Yamilov

Physics Faculty Research & Creative Works

We develop and experimentally verify a theory of evolution of polarization in artificially-disordered multi-mode optical fibers. Starting with a microscopic model of photo-induced index change, we obtain the first and second order statistics of the dielectric tensor in a Ge-doped fiber, where a volume disorder is intentionally inscribed via UV radiation transmitted through a diffuser. A hybrid coupled-power & coupled-mode theory is developed to describe the transient process of de-polarization of light launched into such a fiber. After certain characteristic distance, the power is predicted to be equally distributed over all co-propagating modes of the fiber regardless of their polarization. …


Hot Deformation Behavior Of Friction-Stir Processed Strip-Cast 5083 Aluminum Alloys With Different Mn Contents, M. A. García-Bernal, Rajiv S. Mishra, R. Verma, D. Hernández-Silva Feb 2012

Hot Deformation Behavior Of Friction-Stir Processed Strip-Cast 5083 Aluminum Alloys With Different Mn Contents, M. A. García-Bernal, Rajiv S. Mishra, R. Verma, D. Hernández-Silva

Materials Science and Engineering Faculty Research & Creative Works

Fine grained 5083 aluminum alloy is the most common Al-Mg alloy for superplastic forming (SPF) of lightweight sheet metal parts in the automotive and aerospace industries. the fine-grained sheet is industrially produced by massive cold rolling of conventionally rolled sheet stock at high cost. Friction stir processing (FSP) as a thermomechanical process is very effective in refining the microstructure of as-cast alloys such as that produced by continuous strip casting (CC). in this work, the effect of friction stirs processing on the superplastic properties of three CC 5083 aluminum alloys, with different Mn content, has been investigated. the three alloys …


Steel Building Assessment In Post-Earthquake Fire Environments With Fiber Optical Sensors, Genda Chen, Ying Huang, Hai Xiao Feb 2012

Steel Building Assessment In Post-Earthquake Fire Environments With Fiber Optical Sensors, Genda Chen, Ying Huang, Hai Xiao

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

No abstract provided.


The Bridge Newsletter Spring 2012, Missouri University Of Science And Technology Feb 2012

The Bridge Newsletter Spring 2012, Missouri University Of Science And Technology

The Bridge Newsletter

-Light-weight foam could cushion expensive bridge repairs
-New Chancellor
-The house of the future today
-High-tech approach to project management


A Low-Complexity Design Of Linear Precoding For Mimo Channels With Finite-Alphabet Inputs, Weiliang Zeng, Chengshan Xiao, Jianhua Lu Feb 2012

A Low-Complexity Design Of Linear Precoding For Mimo Channels With Finite-Alphabet Inputs, Weiliang Zeng, Chengshan Xiao, Jianhua Lu

Electrical and Computer Engineering Faculty Research & Creative Works

This paper investigates linear precoding scheme that maximizes mutual information for multiple-input multiple-output (MIMO) channels with finite-alphabet inputs. in contrast with recent studies, optimizing mutual information directly with extensive computational burden, this work proposes a low-complexity and high-performance design. It derives a lower bound that demands low computational effort and approximates, with a constant shift, the mutual information for various settings. based on this bound, the precoding problem is solved efficiently. Numerical examples show the efficacy of this method for constant and fading MIMO channels. Compared to its conventional counterparts, the proposed method reduces the computational complexity without performance loss. …


Efficient Simulation And Analysis Of Quantum Ballistic Transport In Nanodevices With Awe, Jun Z. Huang, Weng Cho Chew, Min Tang, Lijun Jiang Feb 2012

Efficient Simulation And Analysis Of Quantum Ballistic Transport In Nanodevices With Awe, Jun Z. Huang, Weng Cho Chew, Min Tang, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Quantum-mechanical modeling of ballistic transport in nanodevices usually requires solving the Schrdinger equation at multiple energy points within an energy band. To speed up the simulation and analysis, the asymptotic waveform evaluation is introduced in this paper. Using this method, the wave function is only rigorously solved at several sampled energy points, whereas those at other energies are computed through Pad approximation. This allows us to obtain the physical quantities over the whole energy band with very little computational cost. In addition, the accuracy is controllable by a complex frequency hopping algorithm. The validity and efficiency of the proposed method …


The Missouri Miner, January 26, 2012 Jan 2012

The Missouri Miner, January 26, 2012

The Missouri Miner Newspaper

No abstract provided.


Enhancement Of Blackbody Friction Due To The Finite Lifetime Of Atomic Levels, G. Łach, M. Dekieviet, Ulrich D. Jentschura Jan 2012

Enhancement Of Blackbody Friction Due To The Finite Lifetime Of Atomic Levels, G. Łach, M. Dekieviet, Ulrich D. Jentschura

Physics Faculty Research & Creative Works

The thermal friction force acting on an atom moving relative to a thermal photon bath is known to be proportional to an integral over the imaginary part of the frequency-dependent atomic (dipole) polarizability. using a numerical approach, we find that blackbody friction on atoms either in dilute environments or in hot ovens is larger than previously thought by orders of magnitude. This enhancement is due to far off-resonant driving of transitions by low-frequency thermal radiation. at typical temperatures, the blackbody radiation maximum lies far below the atomic transition wavelengths. Surprisingly, due to the finite lifetime of atomic levels, which gives …


Multiscale Perturbative Approach To Su(2)-Higgs Classical Dynamics: Stability Of Nonlinear Plane Waves And Bounds Of The Higgs Field Mass, V. Achilleos, F. K. Diakonos, D. J. Frantzeskakis, Garyfallia C. Katsimiga, X. N. Maintas, C. E. Tsagkarakis, A. Tsapalis Jan 2012

Multiscale Perturbative Approach To Su(2)-Higgs Classical Dynamics: Stability Of Nonlinear Plane Waves And Bounds Of The Higgs Field Mass, V. Achilleos, F. K. Diakonos, D. J. Frantzeskakis, Garyfallia C. Katsimiga, X. N. Maintas, C. E. Tsagkarakis, A. Tsapalis

Physics Faculty Research & Creative Works

We study the classical dynamics of SU(2)-Higgs field theory using multiple-scale perturbation theory. In the spontaneously broken phase, assuming small perturbations of the Higgs field around its vacuum expectation value, we derive a nonlinear Schrödinger equation and study the stability of its nonlinear plane wave solutions. The latter turn out to be stable only if the Higgs amplitude is an order of magnitude smaller than that of the gauge field. In this case, the Higgs field mass possesses some bounds which may be relevant to the search for the Higgs particle at ongoing experiments. © 2012 American Physical Society.


The Missouri Miner, January 19, 2012 Jan 2012

The Missouri Miner, January 19, 2012

The Missouri Miner Newspaper

No abstract provided.


Faculty Senate Minutes January 19, 2012, Missouri University Of Science And Technology Faculty Senate Jan 2012

Faculty Senate Minutes January 19, 2012, Missouri University Of Science And Technology Faculty Senate

Minutes & Agendas

No abstract provided.


Compact Electronic Mode Stirred Chamber, Q. Dai, W. C. Chew, Lijun Jiang, B. Zhu Jan 2012

Compact Electronic Mode Stirred Chamber, Q. Dai, W. C. Chew, Lijun Jiang, B. Zhu

Electrical and Computer Engineering Faculty Research & Creative Works

A method and apparatus provide an improved EM reverberation chamber which facilitates the dynamic three-dimensional (3D) manipulation of EM field polarization within the chamber and produces a uniform field distribution inside the chamber. The chamber includes one or more walls with tunable lumped elements. A controller is provided to generate one or more control signals that are applied to the lumped elements and tunes their impedance in response to the one or more control signals. The result is to generate, within the chamber an electromagnetic field that appears to be random or pseudo-random in polarization, but which is sufficiently uniform …


High-Density Pressurelessly Sintered Zirconium Diboride/Silicon Carbide Composite Bodies And A Method For Producing The Same, Shi C. Zhang, Greg Hilmas, William Fahrenholtz Jan 2012

High-Density Pressurelessly Sintered Zirconium Diboride/Silicon Carbide Composite Bodies And A Method For Producing The Same, Shi C. Zhang, Greg Hilmas, William Fahrenholtz

Materials Science and Engineering Faculty Research & Creative Works

A method of sintering a ZrB2-SiC composite body at ambient pressures, including blending a first predetermined amount of ZrB2 powder with a second predetermined amount of SiC powder, wherein both powders are characterized by the presence of surface oxide impurities. Next the blended powders are mixed to yield a substantially homogeneous powder mixture and a portion of the substantially homogeneous powder mixture is formed into a green body. The body is fired to a first temperature, wherein substantially all surface oxide impurities are reduced and/or volatilized to substantially eliminate oxides from the green body, and the body …


Altering Iron Oxide Nanoparticle Surface Properties Induce Cortical Neuron Cytotoxicity, Christopher J. Rivet, Yuan Yuan, Diana Andra Borca-Tasciuc, Ryan J. Gilbert Jan 2012

Altering Iron Oxide Nanoparticle Surface Properties Induce Cortical Neuron Cytotoxicity, Christopher J. Rivet, Yuan Yuan, Diana Andra Borca-Tasciuc, Ryan J. Gilbert

Chemical and Biochemical Engineering Faculty Research & Creative Works

Superparamagnetic iron oxide nanoparticles, with diameters in the range of a few tens of nanometers, display the ability to cross the blood-brain barrier and are envisioned as diagnostic and therapeutic tools in neuro-medicine. However, despite the numerous applications being explored, insufficient information is available on their potential toxic effect on neurons. While iron oxide has been shown to pose a decreased risk of toxicity, surface functionalization, often employed for targeted delivery, can significantly alter the biological response. This aspect is addressed in the present study, which investigates the response of primary cortical neurons to iron oxide nanoparticles with coatings frequently …


Digital Content Creation: A Global View On Curriculum Design, Hsin-Liang Chen, Tatjana Aparac-Jelušić,, Ron Brown, Samantha Hastings, Yin-Leng Leng Jan 2012

Digital Content Creation: A Global View On Curriculum Design, Hsin-Liang Chen, Tatjana Aparac-Jelušić,, Ron Brown, Samantha Hastings, Yin-Leng Leng

University Libraries Faculty Research & Creative Works

As a result of emerging technologies, courses on digital content creation have been offered at library and information science programs in different countries. Each program presents unique considerations based on its own academic environment; campus expectations and demands; professional development; as well as standards of national education reform. The digital content creation courses are often related to the topics of digital humanities, institutional repositories, digital scholarship, digital archives, learning technologies, and information services. The purpose of this panel is to discuss the current development of those courses, share the best practice strategies, and identify issues for future development from an …


Basis Set Dependence Of Higher-Order Correlation Effects In Π-Type Interactions, Emily J. Carrell, Cara M. Thorne, Gregory S. Tschumper Jan 2012

Basis Set Dependence Of Higher-Order Correlation Effects In Π-Type Interactions, Emily J. Carrell, Cara M. Thorne, Gregory S. Tschumper

Chemistry Faculty Research & Creative Works

The basis set dependence of higher-order correlation effects on -type interaction energies was examined by scanning the potential energy surfaces of five dimer systems. The dimers of acetylene (H-CC-H), diacetylene (H-CC-CC-H), cyanogen (NC-CN), diphosphorous (PP), and 1,4-diphosphabutadiyne (PC-CP) were studied in three different configurations: cross, parallel-displaced, and t-shaped. More than 800 potential energy curves (PECs) were generated by computing the interaction energies for all 15 dimer configurations over a range of intermolecular distances with the MP2, coupled-cluster single double (CCSD), and coupled-cluster single double triple (CCSD(T)) methods in conjunction with 21 basis sets ranging from a small 6-31G*(0.25) split-valence basis …