Digital Commons Network^™

Target Electron Ionization In Li²⁺-L-Li Collisions: A Multi-Electron Perspective, Maciej Dominik Piewanowski, Laszlo Gulyas, Marko W. Horbatsch, Johannes Goullon, Natalia Ferreira, Renate Hubele, Vitor L B D De Jesus, H. Lindenblatt, Katharina R. Schneider, Michael Schulz, Michael Schuricke, Z. Song, Shaofeng Zhang, Daniel Fischer, Tom Kirchner

Physics Faculty Research & Creative Works

Target electron removal in Li²⁺-Li collisions at 2290 keV/amu is studied experimentally and theoretically for ground and excited lithium target configurations. It is shown that in outer-shell ionization a single-electron process plays the dominant part. However, the K-shell ionization results are more difficult to interpret. According to our calculations, the process is shown to be strongly single-particle like. On one hand, a high resemblance between theoretical single-particle ionization and exclusive inner-shell ionization is demonstrated, and contributions from multi-electron processes are found to be weak. On the other hand, it is indicated by the discrepancy between experimental and single-particle …

A First-Principles-Based Model For Crack Formation In A Pressurized Tank Following An Mmod Impact, William P. Schonberg, J. Martin Ratliff

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Most robotic spacecraft have at least one pressurized vessel on board, usually a liquid propellant tank. One of the design considerations of such spacecraft is the anticipation and mitigation of the possible damage that might occur from on-orbit impacts by micro-meteoroids or orbital debris (MMOD). While considerable effort has been expended in the study of the response of non-pressurized spacecraft components to MMOD impacts, relatively few studies have been conducted on the pressurized elements of such spacecraft. In particular, since it was first proposed nearly 45 years ago, NASA's current evaluation methodology for determining impact-induced failure of pressurized tanks has …

Preface, William P. Schonberg

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

No abstract provided.

Nebulized Solvent Ablation Of Aligned Plla Fibers For The Study Of Neurite Response To Anisotropic-To-Isotropic Fiber/Film Transition (Afft) Boundaries In Astrocyte-Neuron Co-Cultures, Jonathan M. Zuidema, Gregory P. Desmond, Christopher J. Rivet, Kathryn R. Kearns, Deanna M. Thompson, Ryan J. Gilbert

Chemical and Biochemical Engineering Faculty Research & Creative Works

Developing robust invitro models of in vivo environments has the potential to reduce costs and bring new therapies from the bench top to the clinic more efficiently. This study aimed to develop a biomaterial platform capable of modeling isotropic-to-anisotropic cellular transitions observed in vivo, specifically focusing on changes in cellular organization following spinal cord injury. In order to accomplish this goal, nebulized solvent patterning of aligned, electro spun poly-. l-lactic acid (PLLA) fiber substrates were developed. This method produced a clear topographic transitional boundary between aligned PLLA fibers and an isotropic PLLA film region. Astrocytes were then seeded on these …

Azimuthal Anisotropy Beneath North Central Africa From Shear Wave Splitting Analyses, Awad A. Lemnifi, Kelly H. Liu, Stephen S. Gao, Cory A. Reed, Ahmed A. Elsheikh, Youqiang Yu, Abdala A. Elmelade

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

This study represents the first multistation investigation of azimuthal anisotropy beneath the interior of north central Africa, including Libya and adjacent regions, using shear wave splitting (SWS) analysis. Data used in the study include recently available broadband seismic data obtained from 15 stations managed by the Libyan Center for Remote Sensing and Space Science, and those from five other stations at which data are publicly accessible. A total of 583 pairs of high-quality SWS measurements utilizing the PKS, SKKS, and SKS phases demonstrate primarily N-S fast orientations with an average splitting delay time of approximately 1.2 s. An absence of …

Impact Of Symmetry On The Ferroelectric Properties Of Catio₃ Thin Films, Michael D. Biegalski, Liang Qiao, Yijia Gu, Apurva Mehta, Qian He, For Full List Of Authors, See Publisher's Website.

Materials Science and Engineering Faculty Research & Creative Works

Epitaxial strain is a powerful tool to induce functional properties such as ferroelectricity in thin films of materials that do not possess ferroelectricity in bulk form. In this work, a ferroelectric state was stabilized in thin films of the incipient ferroelectric, CaTiO₃, through the careful control of the biaxial strain state and TiO₆ octahedral rotations. Detailed structural characterization was carried out by synchrotron x-ray diffraction and scanning transmission electron microscopy. CaTiO₃ films grown on La_0.18Sr_0.82Al_0.59Ta_0.41O₃ (LSAT) and NdGaO₃ (NGO) substrates experienced a 1.1% biaxial strain state …

Consolidation-Induced Solute Transport For Constant Rate Of Strain. I: Model Development And Simulation Results, Hefu Pu, Patrick J. Fox

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

A numerical model, called CSTCRS1, is presented for coupled one-dimensional consolidation and solute transport under constant rate of strain (CRS) loading conditions. The consolidation algorithm accounts for vertical strain, general constitutive relationships, relative fluid velocity, changing compressibility and hydraulic conductivity during consolidation, and an external hydraulic gradient. The solute transport algorithm accounts for advection, dispersion, linear and nonlinear sorption, and equilibrium and nonequilibrium sorption. Soil compressibility is rate-independent and as such CSTCRS1 is more appropriate for less-structured soils. The model is based on a dual-Lagrangian framework that separately tracks the motions of sold and fluid phases. The development of CSTCRS1 …

Privacy-Aware Access Control For Message Exchange In Vehicular Ad Hoc Networks, Sushama Karumanchi, Anna Squicciarini, Dan Lin

Computer Science Faculty Research & Creative Works

Vehicular ad hoc networks are a promising and increasingly important paradigm. Their applications range from safety enhancement to mobile entertainment services. However, their deployment requires several security issues to be resolved, particularly, since they rely on insecure wireless communication. In this paper, we propose a cryptographic-based access control framework for vehicles to securely exchange messages in a controlled fashion by integrating moving object modeling techniques with cryptographic policies. To our knowledge, this is the first time a comprehensive framework for access control in VANETs is proposed.

Boyd Group Electronegativity Influence On The Parr Global Electrophilicity Of Vilsmeier Reagent-Derived Imidates: New Insights Toward Improving Mitsunobu Chemistry, Jeremy M. Carr, Gregory S. Tschumper, A. Paige Lathem

Chemistry Faculty Research & Creative Works

Reactivities of 19 methylated imidate analogs were examined using B3LYP and M06-2X DFT methods. The resulting HOMO and LUMO energies of each optimized structure were used to calculate corresponding Parr global electrophilicity (ω) values. When the resulting quantities were compared against Boyd group electronegativity (X_G) values, a clear correlation was observed, suggesting that electron-withdrawing effects influence the reactivity of imidates. These findings represent an important first step in developing a novel method toward improving traditional Mitsunobu functionalization reactions.

Indolizine-Based Donors As Organic Sensitizer Components For Dye-Sensitized Solar Cells, Aron J. Huckaba, Fabrizio Giordano, Louis E. Mcnamara, Katelyn M. Dreux, Nathan I. Hammer, Gregory S. Tschumper, Shaik M. Zakeeruddin, Michael Grätzel, Mohammad K. Nazeeruddin, Jared H. Delcamp

Chemistry Faculty Research & Creative Works

Strong electron-donating functionality is desirable for many organic donor-π-bridge-acceptor (D-π-A) dyes. Strategies for increasing the electron-donating strength of common nitrogen-based donors include planarization of nitrogen substituents and the use of low resonance-stabilized energy aromatic ring-substituted nitrogen atoms. Organic donor motifs based on the planar nitrogen containing heterocycle indolizine are synthesized and incorporated into dye-sensitized solar cell (DSC) sensitizers. Resonance active substitutions at several positions on indolizine in conjugation with the D-π-A π-system are examined computationally and experimentally. The indolizine-based donors are observed to contribute electron density with strengths greater than triarylamines and diarylamines, as evidenced by UV/Vis, IR absorptions, and …

Analytical Clustering Score With Application To Post-Placement Multi-Bit Flip-Flop Merging, Chang Xu, Peixin Li, Guojie Luo, Yiyu Shi, Iris Hui Ru Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Circuit clustering is usually done through discrete optimizations, with the purpose of circuit size reduction or design-specific cluster formation. Specifically, we are interested in the multi-bit flip-flop (MBFF) design technique for clock power reduction, where all previous works rely on discrete clustering optimizations. For example, INTEGRA was the only existing post-placement MBFF clustering optimizer with a sub-quadratic time complexity. However, it degrades the wirelength severely, especially for realistic designs, which may cancel out the benefits of MBFF clustering. In this paper we enable the formulation of an analytical clustering score in nonlinear programming, where the wirelength objective can be seamlessly …

Q-Learning Based Dynamic Voltage Scaling For Designs With Graceful Degradation, Yu Guang Chen, Wan Yu Wen, Tao Wang, Yiyu Shi, Shih Chieh Chang

Electrical and Computer Engineering Faculty Research & Creative Works

Dynamic voltage scaling (DVS) has been widely used to suppress power consumption in modern designs. The decision of optimal operating voltage at runtime should consider the variations in workload, process as well as environment. As these variations are hard to predict accurately at design time, various reinforcement learning based DVS schemes have been proposed in the literature. However, none of them can be readily applied to designs with graceful degradation, where timing errors are allowed with bounded probability to trade for further power reduction. In this paper, we propose a Q-learning based DVS scheme dedicated to the designs with graceful …

The Benefits Of Scholars' Mine For Faculty, James Roger Weaver

Scholarly Communications - Educational and Promotional Materials

Scholars’ Mine is the institutional repository for the Missouri University of Science and Technology. Scholars' Mine provides access to the digital scholarly and cultural resources created by the university community. This includes faculty papers, departmental publications, conference proceedings, graduate student works, and other scholarly material, as well as campus cultural and historical works.

This document is an education brochure outlining the benefits Scholars' Mine provides to Faculty at the Missouri University of Science and Technology.

Scholars' Mine Non-Exclusive Distribution License, Library And Learning Resources

Scholarly Communications - Educational and Promotional Materials

The intent of the following license agreement is to give The Curators of the University of Missouri on behalf of Missouri University of Science and Technology (Missouri S&T) Library permission to post the material openly on the Web and to take the necessary steps to preserve the material (preserving the material might mean that the files will need to be converted to a different or newer version of a file format if the existing file format or the hardware/software needed to read it becomes obsolete). Authors who submit their work to the Missouri S&T Research Repository retain the copyright to …

Scholars' Mine: Supported File Type Guide, James Roger Weaver

Scholarly Communications - Educational and Promotional Materials

This is a guide to the file types support by Scholars' Mine, the institutional repository of the Missouri University of Science and Technology.

Low-Complexity Soft-Interference Cancellation Turbo Equalisation For Multi-Input-Multi-Output Systems With Multilevel Modulations, Jingxian Wu, Longbao Wang, Chengshan Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

This study presents a low-complexity soft-interference cancellation equalizer (SICE) for the turbo detection of multiple-input-multiple-output systems operating in time dispersive channels. The SICE contains three time-invariant linear filters: a feedforward filter, a causal feedback filter and an anti-causal feedback filter. The feedforward filter is designed to suppress the InterSymbol interference because of channel time dispersion and the multiplexing interference from multiple transmit antennas. The causal (or anti-causal) feedback filter is developed to remove the residual interference caused by the symbols transmitted before (or after) the symbol under detection. The filters are designed by analyzing the statistical properties of soft decisions. …

Fall: A Fair And Low Latency Queuing Scheme For Data Center Networks, Lin Xue, Chui Hui Chiu, Suman Kumar, Praveenkumar Kondikoppa, Seung Jong Park

Computer Science Faculty Research & Creative Works

Low latency, high throughput, and fairness are the stringent performance requirements of data center networks. For web applications continue to thrive, data center must remain effective by addressing these challenges. While most of the challenges have been handled by data center specific transport protocols (e.g. DCTCP), these transport protocols are not default options for data center users. Free choice of transport protocols demands careful consideration for an effective solution. We argue that queuing scheme at layer-2 switches hold the key to address these issues. Therefore, in this paper, we present FaLL, a queuing scheme for data center networks that meets …

Total Projectile Electron Loss Cross Sections Of U28+ Ions In Collisions With Gaseous Targets Ranging From Hydrogen To Krypton, G. Weber, M. O. Herdrich, Robert D. Dubois, P. M. Hillenbrand, H. Beyer

Physics Faculty Research & Creative Works

Beam lifetimes of stored U28+ ions with kinetic energies of 30 and 50 MeV/u, respectively, were measured in the experimental storage ring of the GSI accelerator facility. By using the internal gas target station of the experimental storage ring, it was possible to obtain total projectile electron loss cross sections for collisions with several gaseous targets ranging from hydrogen to krypton from the beam lifetime data. The resulting experimental cross sections are compared to predictions by two theoretical approaches, namely the CTMC method and a combination of the DEPOSIT code and the RICODE program.

The Missouri Miner, March 19, 2015

The Missouri Miner Newspaper

No abstract provided.

Microfracture And Surfactant Impact On Linear Cocurrent Brine Imbibition In Gas-Saturated Shale, Yongpeng Sun, Baojun Bai, Mingzhen Wei

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

During and after hydraulic fracturing, fluid-shale interaction has a prominent impact on liquid retention and thus on gas phase permeability and gas productivity. By providing a low surface tension or wettability alteration, surfactants are widely used to decrease liquid retention after fracturing. To evaluate the liquid intake of a rock sample, an imbibition experiment is commonly used, especially when it is treated by a surfactant. However, conventional imbibition experiments with gas shale could not quantitate the imbibition behaviors as it does with conventional rocks because of the low porosity and extremely low permeability of gas shale. In this paper, a …

Negative-Quench-Induced Excitation Dynamics For Ultracold Bosons In One-Dimensional Lattices, Simeon I. Mistakidis, L. Cao, P. Schmelcher

Physics Faculty Research & Creative Works

The Nonequilibrium Dynamics Following A Quench Of Strongly Repulsive Bosonic Ensembles In One-Dimensional Finite Lattices Is Investigated By Employing Interaction Quenches And/or A Ramp Of The Lattice Potential. Both Sudden And Time-Dependent Quenches Are Analyzed In Detail. For The Case Of Interaction Quenches We Address The Transition From The Strong Repulsive To The Weakly Interacting Regime, Suppressing In This Manner The Heating Of The System. The Excitation Modes Such As The Cradle Process And The Local Breathing Mode Are Examined Via Local Density Observables. In Particular, The Cradle Mode Is Inherently Related To The Initial Delocalization And, Following A Negative …

The Missouri Miner, March 5, 2015

The Missouri Miner Newspaper

No abstract provided.

Purine-Based Triazoles, Prakash Reddy, Nanditha G. Nair, Mark A. Smith, Wataru Kudo

Chemistry Faculty Research & Creative Works

A pharmaceutical composition for inhibiting at least protein kinase in a cell of a subject includes a purine based triazole.

The Fast Solver For Calculating The High Frequency Scattered Field From The Fock Current On The Surface Of The 3-D Convex Scatterer, Yu Mao Wu, Weng Cho Chew, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, we first consider the Fock current from the 3-D convex cylinder. Next, on invoking the incremental length diffraction technique (ILDC), the resultant high frequency scattered fields are expressed in terms of the Fock current. We propose the NSDP method to calculate these scattered fields. Numerical examples illustrate that the proposed NSDP method for calculating the high frequency scattered fields could achieve the frequency independent computational workload and error controllable accuracy.

Accuracy Enhancement Of The Equivalence Principle Algorithm Based On The Meshless Spherical Surface, Xin Fu, Lijun Jiang, Zuhui Ma

Electrical and Computer Engineering Faculty Research & Creative Works

Conventional equivalence principle algorithm (EPA) employs cubical boxes to support equivalence sources. However, it introduces strong discontinuities. In this work, a spherical surface is employed as the equivalence surface in EPA to avoid singularities from non-smooth surfaces. Further to achieve high order accuracy, meshless samples are used for the integrals on the spherical surface to avoid the equivalence surface mesh discretization. Theoretically the accuracy of EPA can be significantly improved, which was further benchmarked though numerical examples. Various meshless schemes are also discussed to achieve the optimal solution based on the spherical equivalence surface.

Missouri S&T Magazine Spring 2015, Missouri S&T Marketing And Communications Department, Miner Alumni Association

Missouri S&T Magazine

No abstract provided.

The Role Of Information And Communication Technologies In Rural Development In India, Shubham Chatterjee, Asoke Nath

Computer Science Faculty Research & Creative Works

Information and Communication Technologies (ICTs) are changing every sphere of our lives. Due to tremendous progress in internet technologies, ICT has a big impact on rural areas and rural lives. Especially in agricultural field there is significant role of ICT in rural areas. It is also expected that the ICT led extension systems are going to act as a key agent for farmers to access information and share knowledge. Hence, renewed enthusiasm to use new ICTs for agricultural advisory services led to mushrooming of e-initiative pilots in India. The innovators are experimenting innovative ICT initiatives solely for agricultural information and …

Spring 2015 E-Certi Newsletter, Center For Educational Research And Teaching Innovation

CAFE Faculty Newsletters

Hello S&T Instructors – It’s the messy month of March at Missouri S&T, where recess and spring break can wreak havoc with instructor’s teaching schedules. In this issue, we feature several faculty who have made the most of their time with their students in the classroom and lab, and have the accolades to prove it, including Melanie Mormile, Ralph Flori and Bill Gillis. Read on ...

A Glass Polyalkenoate Cement Carrier For Bone Morphogenetic Proteins, Adel M.F. Alhalawani, Omar Rodriguez, Declan J. Curran, Russell Co, Sean Kieran, Saad Arshad, Timothy J. Keenan, Anthony W. Wren, Gazelle Crasto, Sean A.F. Peel, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

This work considers a glass polyalkenoate cement (GPC)-based carrier for the effective delivery of bone morphogenetic proteins (BMPs) at an implantation site. A 0.12 CaO–0.04 SrO–0.36 ZnO–0.48 SiO₂ based glass and poly(acrylic acid) (PAA, Mw 213,000) were employed for the fabrication of the GPC. The media used for the water source in the GPC reaction was altered to produce a series of GPCs. The GPC liquid media was either 100 % distilled water with additions of albumin at 0, 2, 5 and 8 wt% of the glass content, 100 % formulation buffer (IFB), and 100 % BMP (150 µg …

Numeric Tuning Of Surface Plasmon Enhanced Spontaneous Emission Inducted By Nano-Metallic Particle Systems Embedded In Gan-Based Led, Ying Chou Lin, Duan Yang Liu, Jin Wei Gao

Economics Faculty Research & Creative Works

In this work, spontaneous emission enhancement inducted by surface plasmon on nano-metallic particle systems embedded in GaN-based LED is investigated numerically. The systems under study consist of two nano-Ag balls or cylinders. By numerically tuning geometrical parameters of the system and polarization of the photon emitting source, we investigate the dependence of spontaneous emission enhancement effect on those factors. It is found that the enhancement magnitude level and peak position are subject to geometrical characteristics of the nano-Ag components in different manners for symmetrical and asymmetrical systems respectively. Higher enhancement ratio for a specific wavelength can be obtained by tweaking …