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The Effect Of Z-Binding Yarns On The Electrical Properties Of 3d Woven Composites, Mohamed Nasr Saleh, Arief Yudhanto, Gilles Lubineau, Constantinos Soutis

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Electrical resistance monitoring (ERM) has been used to study the effect of the z-binding yarns on the initial electrical resistance (ER) and its change of three architectures of 3D woven carbon fiber composites namely (orthogonal "ORT", layer-to-layer "LTL" and angle interlock "AI") when tested in tension. Specimens are loaded in on-axis "warp" and off-axis "45°" directions. In situ ERM is achieved using the four-probe technique. Monotonic and cyclic "load/unload" tests are performed to investigate the effect of piezo-resistivity and residual plasticity on resistance variation. The resistance increases for the off-axis loaded specimens (∼90%) is found to be higher than that …

Still Soldiers And Scholars? An Analysis Of Army Officer Testing, Steven J. Condly, Arthur T. Coumbe Dr., William L. Skimmyhorn Lieutenant Colonel

Books, Monographs & Collaborative Studies

Still Soldiers and Scholars? sheds light on a neglected aspect of talent management, namely, officer accessions testing and evaluation. It does so by tracing the history of officer testing since 1900, identifying and analyzing key developments in the assessment process, and then offering recommendations about how the Army should revise its approach to officer testing. This book supplements a series of monographs written by the Army’s Office of Economic and Manpower Analysis (OEMA) and published by the Strategic Studies Institute (SSI) in 2009 and 2010. In those monographs, the authors proposed an officer corps strategy based on the theory of …

In The Lab, Jeremy Gasowski

UNH Today Archive

No abstract provided.

Wildcat Stadium Wins New England “Best Projects” Award, Mike Murphy

UNH Today Archive

No abstract provided.

Modified Pid Controller Design For Active Transverse Anti-Rolling System For Ships With Low Roll Motion, Hsing-Cheng Yu, Jhih-Jyun You

Journal of Marine Science and Technology–Taiwan

Multi-domain physical modeling software with an intuitive simulation methodology using MapleSim was adopted in this study to create a rigid body structure model of an active transverse anti-rolling system (ATARS) of a container ship. At the same time, a ship stability analysis was also conducted to determine the force model, dynamic equilibrium, and motion behavior of the ATARS of the container ship. Once various external transverse force generated by waves impact varied roll angles of the ATARS on the vessel, a modified proportional-integral-derivative (PID) controller designed to improve the capability of the active stabilizer fins used in the ATARS is …

Experimental Assessment Of Suspended Sediment Concentration Changed By Solitary Wave, Jae-Nam Cho, Chang-Geun Song, Kyu-Nam Hwang, Seung-Oh Lee

Journal of Marine Science and Technology–Taiwan

A large scale solitary wave causes a lot of sediment transportation and coastal beach erosion, for example tsunami is the one type of solitary waves. During passing such solitary wave over coastal region, higher energy on sediment transportation near bottom would bring to massive geomorphological changes and even worse damages in life and economics. The major objective of this study is to analyze the incipient motion of sediment suspended from bottom by a solitary wave through hydraulic experiments and numerical simulations. First, to estimate the process of sediment transport the experimental study was carried out in the prismatic rectangular channel …

The Nonlinear Dynamics And Anti-Sway Tracking Control For Offshore Container Crane On A Mobile Harbor, You-Gang Sun, Hai-Yan Qiang, Junqi Xu, Da-Shan Dong

Journal of Marine Science and Technology–Taiwan

The offshore container crane (OCC), as a novel maritime container transfer system, can handle container from a large container-ship anchored in open sea to address the congestion and limited water-depth of port. However, for the wave- and wind-induced movements of the ship, the crane's control system should be redesigned to ensure the load transfer on the sea. In this paper, we derive the nonlinear dynamic equations of OCC system subjected to the ship motions based on dynamic analysis. Then a double-layer sliding manifold is constructed to realize the position tracking and sway control simultaneously, irrespective of ship motions and parameters …

Numerical Computation Of The Transient Salinity Distribution In A Macro-Tidal Estuary, Seung Oh Lee, Chang Geun Song

Journal of Marine Science and Technology–Taiwan

In this study, the flow reversal and salinity distribution associated with tidal effects were investigated at a macro-tidal estuary located in tidal range of the Yellow Sea in South Korea. A 2-D hydrodynamic model (RMA-2) and a 2D advectiondispersion model (RAM4) were employed to simulate flow behavior and salinity distribution, respectively. The results showed that reverse flow occurred five times over 3-day period and the maximum reverse flow extended over 32.9 km upstream. Salinity distribution was obtained by estimating the salinity input with analytical solution of advection-dispersion equation. The total length of the saline wedge calculated from numerical simulation was …

Simulation And Motion Analysis Of Deepwater Manifold Lifting, Zhiwei Chen, Tingdi Zhao, Jian Jiao, Dongfeng Mao

Journal of Marine Science and Technology–Taiwan

The development and utilization of oil and gas resources has expanded to deep water. The installation of a subsea manifold is crucial for developing offshore oil-gas fields. In this study, we used the lifting installation method (LIM) to install a subsea manifold. First, the appropriate environmental parameters were selected through the analysis of environmental loads at the Liwan 3-1 Gasfield in the South China Sea. The wind and wave spectra were selected using noise power density and Joint North Sea Wave Project spectra, respectively. The entire lifting and installation system that responds to environmental loads comprised a vessel, cable, and …

Energy Efficient Trajectory Design For The Underwater Vehicle With Bounded Inputs Using The Global Optimal Sliding-Mode Control, Mai The Vu, Hyeung-Sik Choi, Jin-Il Kang, Dae-Hyung Ji, Hyun Joong

Journal of Marine Science and Technology–Taiwan

In this paper, we propose a novel global sliding mode controller (SMC) for an uncertain linear time-varying second order system. The proposed controller was implemented on the underwater vehicle (UV) with uncertainty of bounded parameters and disturbances within limited control input. By applying the proposed controller to the second-order UV system, the arrival time at the reference position and the maximum allowable acceleration are expressed in a closed-form equation if ranges of parametric uncertainties and reference inputs are specified. The closed-form equation can be utilized in designing the capacity of vehicle systems with the condition of the minimum arrival time …

Real-Time Method For Calculating Retardation Functions, Li-Hao Yuan, Yue-Sheng Ma, Ying-Fei Zan, Zhao-Hui Wu

Journal of Marine Science and Technology–Taiwan

To meet the demand for real-time calculation of time-domain motion equations, a state-space model was established to replace the convolution integral method to improve computational efficiency. On the basis of the HYSY201 vessel, the impulse response curve fitting method and the realization theory method based on the time-domain identification theory were compared to establish the state-space model. The results of roll decay simulation conducted using the state-space model and the convolution integral method were verified against decay test results. The simulation results for retardation function, radiation forces, and motion time histories calculated using the state-space model and the convolution integral …

Survey Of Trajectory Tracking Control Of Autonomous Underwater Vehicles, Wen-Yang Gan, Da-Qi Zhu, Wei-Li Xu, Bing Sun

Journal of Marine Science and Technology–Taiwan

Autonomous underwater vehicles (AUVs) are powerful instruments that enable the exploration of the ocean. In recent years, AUVs have been developed considerably. Trajectory tracking control, which has been a major research focus for many decades due to its variety of applications, is one of the key advancements in the AUV technology. This paper presents six trajectory tracking control methods: PID (proportion integration differentiation) control, fuzzy control, adaptive control, sliding mode control, backstepping control, and neural network control. A few novel methods for trajectory tracking control are also introduced. First, the concept of trajectory tracking control for an AUV and the …

Modeling Of Dynamic Behavior For Port Structures Using The Performance-Based Seismic Design, Cheng-Yu Ku, Jing-Jong Jang, Jui-Ying Lai, Ming-Jr Hsieh

Journal of Marine Science and Technology–Taiwan

The paper presents a pioneer study on numerical modeling of dynamic behavior for port structures using the performancebased seismic design in Taiwan. Since Taiwan is located in earthquake prone area, there is significant interest in improving prediction of the behavior of port structures subjected to seismic loading. The investigation of port structures using three different analysis methods including the simplified analysis, the simplified dynamic analysis, and the dynamic analysis were adopted for evaluating the performance of the cellular quay wall and sheet pile quay wall. In addition, the effective stress analysis with the consideration of the pore pressure generation and …

Cost Of Salvage?€“ A Comparative Form Approach, Chung-Sheng Chiu, Chung-Ping Liu, Ki-Yin Chang, Wen-Jui Tseng, Yung-Wei Chen

Journal of Marine Science and Technology–Taiwan

The most important principle of salvage is the "No Cure-No Pay" basis, if there is no recovery, there is no payment, whatever the expense of the operation. However, this principle has changed in recent years to reflect the public interest in prevention of damage to the environment (Mudric, 2010). The salvor can now contract in such a way that he is shielded from loss when responding to high risk or low value casualties (so called as "No Cure-Some pay"). Salvage is a high-profit business and high-risk as well in the world. The case of the Costa Concordia - by no …

A Numerical Model For Pipeline Abandonment In Deep Water, Duanfeng Han, Kuo Huang, Yingfei Zan, Zhaohui Wu

Journal of Marine Science and Technology–Taiwan

In offshore oil and gas engineering, pipeline abandonment is unavoidable and its mechanical analysis is necessary and important. For this problem, a numerical model is developed in this study to evaluate pipeline abandonment for the J-laying method. The whole system considered in this model is divided into two parts: the A&R cable and the pipeline in the water. A catenary model was proposed for the former, and the latter is solved by a numerical iterative method. In addition to the boundary conditions at the two end points, a special set of boundary conditions is required at the junction that connects …

Experimental Study Of Dynamic Stability Of Underwater Vehicle-Manipulator System Using Zero Moment Point, Jin-Il Kang, Hyeung-Sik Choi, Mai The Vu, Nguyen Ngoc Duc, Dae-Hyeong Ji, Joon-Young Kim

Journal of Marine Science and Technology–Taiwan

For manipulative underwater operations, an underwater vehiclemanipulator system (UVMS) has more degrees of freedom than those required to conduct a given mission. To follow the desired end-effector position and velocity accurately, UVMS should be able to generate trajectories of manipulators and the underwater vehicle can maintain dynamic stability of the entire system. In this paper, redundancy resolution is performed to find a solution satisfying the given task among many joint-space solutions. Also, to improve the dynamic stability of the UVMS, zero moment point (ZMP) is adopted such that it requires some constraints. For application of UVMS, a joint limitation is …

A Time-Domain Numerical Tool For A Wave Energy Attenuator With The Sph Method, Da-Wei Chen, Shuichi Nagata, Shiaw-Yih Tzang, Yasutaka Imai, Chih-Min Hsieh, Jiahn-Horng Chen

Journal of Marine Science and Technology–Taiwan

The wave energy attenuator is a floating device which operates perpendicular to the wave fronts and captures wave energy from the relative motions of two hinged floaters as waves passing by them. For establishing the time-domain numerical tools to evaluate the performance of a wave energy attenuator, a Smoothed Particle Hydrodynamic (SPH) model with mesh-free method was adopted to simulate the hydrodynamic behaviors of each floating object. Three different wave heights of 6 cm, 7 cm, and 10.4 cm of the same period of 1.22 s were commonly derived from typical potential oceanic zones offshore Taiwan and Japan. Comparisons of …

Dynamic Response Analysis Of Micro-Grid With Ocean Thermal Energy Conversion, Chia-Yu Hsu, Ming-Wang Chen, Pei-Hwa Huang

Journal of Marine Science and Technology–Taiwan

The main purpose of this paper is to analyze the dynamic responses of micro-grid with Ocean Thermal Energy Conversion (OTEC) system. The power sources of the studied micro-grid system include an OTEC generator and a wind generator. Three different types of OTEC generation systems, i.e., open-cycle, closed-cycle, and hybrid-cycle, are considered, under the conditions with the same temperature of sea water and output of generator. When the system operates in an islanding or gridconnected mode, the responses subject to load variation are quite different. As the system operates in the grid-connected mode, the voltage and frequency are less affected by …

Cyclic Shear Behavior Characteristics Of Marine Silty Sand, Su Won Son, Min Jae Ko, Jin Man Kim

Journal of Marine Science and Technology–Taiwan

Owing to the high demand for energy supply, the use of offshore wind turbines as a renewable and environment-friendly energy source has been remarkably increased. After installation in the ocean, the offshore structure foundations and soil that support them are subjected to cyclic loading from wind and waves. In this study, laboratory experiments were conducted to evaluate the shear behavior characteristics of the marine soil subjected to cyclic loading. Utilizing a cyclic direct simple shear (CDSS) test apparatus, the undrained shear failure behavior of marine silty sand was investigated. The results show that the cyclic behavior and permanent shear strain …

Research On Integration And Sharing Solutions For Big Structured Data For The Marine Environment, Wei Wang, Wenfang Cheng, Jing Chen, Ya-Nan Yu, Jianxun Zhang

Journal of Marine Science and Technology–Taiwan

The data-intensive science, a new paradigm in scientific discovery, demands an urgent solution to integrate and share big marine environment data. Through the modeling of marine environmental features (such as Temperature, Salinity, Density et al.), a novel solution is presented in this paper. This solution employs Hadoop and Hbase, based on the Bigtable algorithm first proposed by Google Inc. By using hierarchical technology, scalability of the data integration framework is realized. Additionally, an efficient execution of various queries is realized by using the customized auxiliary index algorithm. In the experimental cluster environment constructed from four ordinary personal computers, experiments involving …

A Simplified Analytical Method For Estimating Flow-Induced Vibration Responses Of Hydraulic Structures Caused By Flow Fluctuation, Ya-Chao Wu, Lu Lu, Qin-Man Fan, Yun Dong, Chun-Yuan Zuo

Journal of Marine Science and Technology–Taiwan

In many hydraulic engineering investigations of flow-induced vibration responses, a model test is necessary but yet expensive. In this article, an equilibrium equation between the operation of fluctuating pressure and the work done by damping is established to provide a simplified analytical method for estimating the flow-induced vibration responses of hydraulic structures caused by water flow fluctuations. This approach is based on the Westergaard solution. The flow-induced vibration of water flowing around a dividing wall, the flood discharge vibration of the Liuxihe arch dam, and the flow-induced vibration of the Ertan hyperbolic arch dam are presented to explain the detailed …

Emotionally And Socially Aware Approaches To Understanding And Changing Users’ Cybersecurity Behavior, Michael Fagan

Doctoral Dissertations

Security is a priority to most, but studies show that users commonly fail to adopt recommended cybersecurity behavior. Researchers have looked to user factors for explanations of this gap, finding security and convenience to be common considerations, along with perceptions of risks and past experiences. Some have tried to alter user behavior, but are targeted at specific advice and focused on rational motivations to persuade users.

In this thesis, three expertly recommended cybersecurity advice (i.e., updating software regularly, using two-factor authentication, using a secure password manager) are deeply explored. These results inform the design of videos in a systematic study …

Advanced Power Loss Modeling And Model-Based Control Of Three-Phase Induction Motor Drive Systems, Yiqi Liu

Doctoral Dissertations

Three-phase induction motor (IM) drive systems are the most important workhorses of many industries worldwide. This dissertation addresses improved modeling of three-phase IM drives and model-based control algorithms for the purpose of designing better IM drive systems. Enhancements of efficiency, availability, as well as performance of IMs, such as maximum torque-per-ampere capability, power density, and torque rating, are of major interest. An advanced power loss model of three-phase IM drives is proposed and comprehensively validated at different speed, load torque, flux and input voltage conditions. This model includes a core-loss model of three-phase IMs, a model of machine mechanical and …

Design And Fabrication Of Micro-Pillar Based Piezoresistive Flow Sensors, Adimali Piyadasa

Doctoral Dissertations

This study is focused on developing a new type of micro-scale gas flow sensors to be used in critical environments such as combustion engines with high pressure high temperature gas flow and integrated micro electro mechanical applications such as lab-on-chip devices. Proposed flow sensor is based on piezoresistivity of Silicon micro column cantilever. Change in resistivity tensor due to gas flow induced stress in the piezoresistive layer results in generating of an output voltage proportional to the gas flow rate in the channel. Current results show that the anisotropic properties of the Silicon can be successfully used in the gas …

Modeling Iron Oxide Reactivity In The Environment, Nefeli Maria Bompoti

Doctoral Dissertations

Iron oxides and hydroxides are highly reactive mineral phases in natural systems since they interact with pollutants, controlling their fate and transport in the environment. Goethite (GH) and hematite (HT) are the most abundant iron minerals in nature, while ferrihydrite (FH) is a nanomineral with high surface reactivity. Subsurface transport modeling has usually represented the adsorption processes by empirical relationships, such as distribution coefficients (K_d) or isotherm equations. However, empirical approaches cannot account for variable geochemical conditions. These effects can be addressed by the mechanistic surface complexation models (SCMs). So far, the application of SCMs has been limited …

The Sioux's Suits: Global Law And The Dakota Access Pipeline, Stephen Young

American Indian Law Journal

The Sioux Tribe’s lawsuits and protests against the Dakota Access Pipelines (DAPL) received an incredible amount of international attention in ways that many Indigenous peoples’ protests have not. This article argues that attention exists because the Sioux Tribe has been at the epicenter of the Indigenous peoples’ rights movement in international law. Accordingly, they have invoked or claimed international human rights—particularly free, prior, and informed consent (FPIC)— to complicate, and perhaps destabilize, the DAPL’s development. However, the importance of their activism is not merely in claiming human rights.

Based upon a global map of law that involves multiple and overlapping …

Evaluation Of Genetic Diversity And Stability Of Colocasia Cultivars Using Issr, Seukmin Hong

Electronic Theses and Dissertations

Using 44 ornamental Colocasia cultivars planted at Stephen F. Austin State University (Nacogdoches, TX), cultivar assessment, genetic diversity, stability, and relationship were examined with banding patterns produced from Inter-simple sequence repeat (ISSR) markers. Comparing banding patterns of vegetatively propagated clones of each cultivar, genetic stability was examined. Unweighted pair group method with arithmetic mean (UPGMA) and principal coordinate analysis (PCO) were performed to examine genetic relationship that can explain a need for the new classification Colocasia gigantea and recent movement of re-classifying Colocasia antiquorum. Average Shannon’s diversity index for all loci was found to quantify genetic diversity. The genetic …

Examining The Role Of Arts Education Partnerships In Sustaining Arts Programs In California Elementary Schools, Marie-Helene Bauguil

Dissertations

This study investigated three arts education partnerships in California elementary schools. The research questions that guided the inquiry were exploratory in nature and intended to reveal the day-to-day functioning of these partnerships, the challenges they faced, and the factors that contributed to their success, through the recounted experiences of the various institutional actors involved. The participants (n=21) comprised school principals and teachers, arts organizations administrative staff, and teaching artists. Qualitative inquiry methods (in-person interviews, classroom observations, and review of relevant documents) were used to analyze the data. The findings showed that the schools’ administrators and faculty appreciated the arts residencies, …

Improving Early Sepsis Identification On Inpatient Units, Hannah Pari

Master's Projects and Capstones

Sepsis is a life threatening medical emergency that if left untreated could ultimately lead to death. It is defined as the body’s extreme response to infection which can rapidly worsen if not identified and managed quickly. As sepsis worsens, it leads to extended hospital stays, poor patient prognoses and increased hospital costs. In an effort to combat these negative outcomes, efficient protocols must be implemented hospital wide. A 5 P’s microsystem assessment was preformed to assess the purpose, patients, professionals, processes and patterns. Additionally, assessments were conducted to collect baseline nursing knowledge regarding sepsis criteria, treatment, and hospital protocol. A …

Development Of A Formalized Mentorship Program, Rozlyn Bauer

Master's Projects and Capstones

The purpose of this project is to help increase retention of newly licensed registered nurses (NLRN) at a large community medical center. The medical center loses approximately 20 NLRNs per year which is costly for the medical center. The loss of NLRN can be attributed to decreased job satisfaction, poor nursing competence and lateral violence between the nursing staff. Evidence shows that mentorship is a proven, evidence-based approach to solving these issues and more (Hodgson & Scanlan, 2013).

Not only can mentorship help increase retention, address lateral violence, increase job satisfaction and nursing competence but, it can also help enhance …