Digital Commons Network^™

Measurements Of Milli-Newton Surface Tension Forces With Tilted Fiber Bragg Gratings, Changyu Shen, Chuan Zhong, Dejun Liu, Xiokang Lian, Jianyao Zheng, Jingjing Wang, Yuliya Semenova, Gerald Farrell, Jacques Albert, John F. Donegan

Articles

Small lateral forces (lower than 0.1 N) cannot normally be measured with conventional single-mode fiber-based sensors because of the high value of their Young modulus (>70 GPa). Here we demonstrate the measurement of lateral forces in the range from 0.2 to 1.4 × 10−3 N with a tilted fiber Bragg grating (TFBG) in conventional single-mode fiber pushed against the surface tension (ST) of a bead of water. The measured transmission changes of individual cladding mode resonances of the TFBG corresponding to these force values are of the order of 29 dB. Separate measurements of the contact angle between the …

Optical Fibre Sensors For Monitoring Phase Transitions In Phase Changing Materials, Rahul Kumar, Wei Han, Dejun Liu, W. P. Ng, Binns, Richard Binns, Richard, Krishna K. Busawon, Yong Qing Fu, Zabih Ghassemlooy, Chris P. Underwood, Khamid Kh Mahkamov, Jinhui Yuan, Chongxiu Yu, Huazhong Shu, Xing Ao Li, Tuan Guo, Gerald Farrell, Yuliya Semenova, Qiang Wu

Articles

A platinum coated singlemode-multimode (SM) structure is investigated in this paper as an optical fibre sensor (OFS) to monitor the phase transition of a phase change material (PCM). Paraffin wax has been used as an example to demonstrate the sensor's performance and operation. Most materials have the same temperature but different thermal energy levels during the phase change process, therefore, sole dependency on temperature measurement may lead to an incorrect estimation of the stored energy in PCM. The output spectrum of the reflected light from the OFS is very sensitive to the bend introduced by the PCM where both liquid …

A Comprehensive Experimental Study Of Whispering Gallery Modes In A Cylindrical Micro-Resonator Excited By A Tilted Fiber Taper, Vishnu Kavungal, Gerald Farrell, Qiang Wu, Arun Mallik, Yuliya Semenova

Articles

Whispering gallery modes (WGMs) excitation in a cylindrical microresonator formed by a section of silica optical fiber has been studied. Evanescent light coupling into the microresonator is realized using a tapered optical fiber, fabricated by a microheater brushing technique. Several types of silica fibers with different diameters are studied as microresonators, and the influence of the resonator's diameter on the excitation of WGMs is investigated. The excitation of WGMs in a cylindrical fiber resonator were studied with changes to the tilt angle between the microcylinder and the fiber taper in the range of angles from a perpendicular position (0 degrees) …

Singlemode-Multimode-Singlemode Fibre Structure For Phase Transition Monitoring In Phase Changing Materials, Rahul Kumar, Wei Han, Dejun Liu, Wai Pang Ng, Richard Binns, Krishna Busawon, Yong Qing Fu, Zabih Ghassemlooy, Christopher Underwood, Khamid Mahkmov, Jinhui Yuan, Chongxiu Yu, Huazhong Shu, Xing Ao Li, Tuan Guo, Gerald Farrell, Yuliya Semenova, Qiang Wu Prof.

Articles

Abstract. A platinum-coated singlemode-multimode structure is investigated in this paper as an optical fibre sensor (OFS) to monitor the phase transition of a phase change material (PCM). Paraffin wax has been used as an example to demonstrate the sensor’s performance and operation. Most materials have the same temperature but different thermal energy levels during the phase change process, therefore, sole dependency on temperature measurement may lead to an incorrect estimation of the stored energy in PCM. The output spectrum of the reflected light from the OFS is very sensitive to the bend introduced by the PCM where both liquid and …

Formation And Development Of Nanometer-Sized Cybotactic Clusters In Bent-Core Nematic Liquid Crystalline Compounds, Yuri Panarin, Sithara P. Sreenilayam, Jagdish K. Vij, Anne Lehmann, Carsten Tschierske

Articles

Two homologue achiral bent-core liquid crystals (LCs), BCN66 and BCN84, in their nematic phases are studied by dielectric spectroscopy in the frequency range 10 Hz–10 MHz. In each of these compounds, two relaxation processes are identified and assigned to (i) collective dynamics of molecules in nanometer-sized cybotactic clusters and (ii) individual molecular relaxations, in the ascending order of frequency of the probe field. The temperature and the bias electric field dependence of the dielectric strength and relaxation frequency for these processes are shown to give rise to sharpness in cluster boundaries, increased size and volume fraction in the LC nematic …

Optical Fiber Fresnel Reflection Sensor For Direct Detection Of The Solid-Liquid Phase Change In N-Octadecane, Wei Han, Marek Rebow, Dejun Liu, Gerald Farrell, Yuliya Semenova, Qiang Wu

Articles

An all optical fiber Fresnel reflection sensor for detecting the solid–liquid phase change in n-octadecane is proposed and experimentally demonstrated. The sensor probe consists of a single-mode fiber with a cleaved end which is immersed in the material sample under test. As the n-octadecane changes from solid to liquid or from liquid to solid, its refractive index (RI) changes resulting in changes of the light power ratio reflected by the probe. Since the RI of n-octadecane during its phase transition changes discontinuously, inflection in the reflected light power ratio dependence indicates the phase change of the sample in the vicinity …

The Role Of The Dendritic Growth Models Dimensionality In Predicting The Columnar To Equiaxed Transition (Cet), M. Seredyński, Marek Rebow, J. Banaszek

Articles

The dendrite tip kinetics model accuracy relies on the reliability of the stability constant used, which is usually experimentally determined for 3D situations and applied to 2D models. The paper reports authors` attempts to cure the situation by deriving 2D dendritic tip scaling parameter for aluminium-based alloy: Al-4wt%Cu. The obtained parameter is then incorporated into the KGT dendritic growth model in order to compare it with the original 3D KGT counterpart and to derive two-dimensional and three-dimensional versions of the modified Hunt’s analytical model for the columnar-to-equiaxed transition (CET). The conclusions drawn from the above analysis are further confirmed through …

An Lcl-Filter Design With Optimum Total Inductance And Capacitance, Sampath Jayalath, Mohamed Moin Hanif

Articles

LCL-filter is among the best performing filters for grid-connected voltage source inverters. Designing of the filter parameters (grid-side and inverter-side inductors and capacitor), takes an iterative approach due to the coherence between the parameters and design requirements such as IEEE-519 Std for harmonic current limitations, reactive power compensation limit, and maximum allowable voltage drop across the filter to limit the switching losses. Most of the proposed LCL-filter optimization strategies emphasize on reducing the total inductance and losses of the filter while meeting the design requirements. There is less emphasis given on the capacitor selection and optimizing its value. Therefore, this …

Relationship Between Concussion Symptom Clusters And Return-To-Play Time In College Athletes With Sports-Related Concussions: 2009-2010 To 2013-2014 Disc, Adrian Joseph Boltz

UNF Graduate Theses and Dissertations

Objectives To examine the relationship between Concussion Symptom Clusters (CSCs) and return-to-play time using a representative sample of U.S. college athletes with sports-related concussions.

Background Recent evidence regarding concussion symptoms have been observed to be an important element of concussion severity, and potentially a predictor of return-to-play time. However, there is a paucity of data examining the associations between Concussion Symptom Clusters (CSCs) and return-to-play time in the U.S. college athlete population.

Methods Data from the 2009-2010 to 2013-2014 academic years (n=1670) were obtained from the Datalys Center for Sports Injury and Prevention Inc. database. Exploratory factor analytic methods were …

Public Authority Liability And The Regulation Of Nanotechnology: A European Perspective, Nina Natalia Baranowska

Canadian Journal of Law and Technology

This paper argues that in certain circumstances public authorities should be liable for regulating nanotechnology. Nanotechnology is an emerging field of technology that enables to control shape and size of various structures, devices and systems at nanometer scale on which one nanometer is equal to one-billionth of a meter. In spite of being a nascent field of science and technology, its scope of application – in the food, pharmaceuticals, cosmetics, construction, textile, electronics, and agricultural industries – is expanding rapidly. The risks associated to nanotechnology, however, and its long-term consequences are still largely unknown, particularly in regards to its health …

The Aleph Bet: Debating Metaphors For Information, Data Handling And The Right To Be Forgotten, Chris Prince, Micheal Vonn, Lex Gill

Canadian Journal of Law and Technology

Court rulings in the European Union (EU) have now established that individuals may seek erasure of personal information posted online. Typically, this involves de-indexing a website from search results, and in some instances the removal of content from primary sources sites. This has, in turn, led to debate around both the logistics and the unintended consequences of removing information online, and subsequent discussions have grappled with a range of images and metaphors to map that new legal reality. This essay surveys that debate, the imagery it employs, and the various logics associated with these metaphors.

Nebraska Annual Social Indicators Survey (Nasis) 2018 Methodology Report, Bureau Of Sociological Research

Nebraska Annual Social Indicators Survey (NASIS)

Introduction 3

Mode Selection 3

Design & Item Selection 3

Sampling Design 4

Experimental Design Treatment 4

Data Collection Process 4

Response Rate 5

Data-Entry Training, Supervision, and Quality Control 5

Processing of Completed Surveys 5

Data Cleaning 5

Representativeness of the Survey 6

NASIS Sample Weights 6

Figures 8

Tables 9

Appendix A: Cover Letter 11

Appendix B: Formatted Mail Survey 13

Appendix C: Future Interest Research Form 45

Appendix D: Reminder Postcard 46

Appendix E: County Codes 47

Appendix F: Variables and Descriptions 48

Nursing Staff And Musculoskeletal Disorders: How To Promote The Application Of Preventive Practices In The Workplace, Saliha Ziam

Fiches

No abstract provided.

Intersectionality Research Within Latinx Mental Health: Conceptual And Methodological Considerations, Lucas Torres, Felicia Mata-Greve, Claire Maria Bird, Erick Herrera Hernandez

Psychology Faculty Research and Publications

Intersectionality considers the meaning and consequences associated with multiple identities along interlocking systems of disadvantage and inequality (Cole, 2009; Crenshaw, 1991). In recent years, there has been increasing attention on examining the mental health outcomes associated with membership in multiple marginalized groups. Unfortunately, intersectionality research examining the unique experiences of Latinx groups remains scarce. The current article reviews theoretical and methodological considerations regarding intersectionality research within Latinx mental health. From a theoretical perspective, intersectionality brings a series of questions regarding the epistemological approaches to studying psychological phenomena. This, in turn, influ- ences the methodological strategies used to examine these processes. …

Investigating Instructional Design Management And Leadership Competencies - A Delphi Study, Joel Gardner, Lewis Chongwony, Tawana Washington

All Faculty and Staff Scholarship

Research in instructional design and educational technology journals typically focuses on the theories, technologies, and processes related to practice of instructional design. There is little research emphasis, however, on leadership and management of instructional design in higher education. Investigating the competencies associated with effective leadership and management of instructional design is critical as it would provide the field with guidance on how to more effectively prepare and train instructional design leaders and managers in higher education. In this study, we explored the competencies required for an instructional design manager to be effective in higher education settings. We used a Delphi …

Routes, Locations, And Social Imaginary: A Comparative Study Of The On-Going Production Of Geographies In Somali Forced Migration, Marnie Shaffer, Giulia Ferrato, Zaheera Jinnah

All Faculty and Staff Scholarship

Drawing on the thresholds approach, a model that incorporates geography and mobility studies to understand migration from the perspective of migrants, this article examines the importance of location and route(s) in determining the journeys of Somali migrants. We use the protracted displacement of Somalis to address the process through which actual and perceived geographies are produced and reconfigured by Somali migrants on the move. In doing so, we look at how different migration paths, connected through transnational networks, influence the geographical perception of migrants at the core of any cross-border experience. Employing ethnographic fieldwork with Somalis in South Africa and …

Social Control In Transnational Families: Somali Women And Dignity In Johannesburg, Marnie Shaffer

All Faculty and Staff Scholarship

Transnational mobility often separates families and distances individuals from the kinship and social structures by which they organized their lives prior to migration. Myriad forms of insecurity have been the impetus for Somali movement into the diaspora, with people fleeing the realities of conflict that have marked Somalia for decades while physically dividing families as individuals settle in different countries around the world. Mobility has altered the dynamics of households, families, and communities post-migration, reshaping social constructions as individuals move on without the familial support that sustained them in Somalia. While outcomes of these hardships are variable and often uneven …

A Coated Spherical Micro-Resonator For Measurement Of Water Vapor Concentration At Ppm Levels In Very Low Humidity Environments, Arun Mallik, Gerald Farrell, Dejun Liu, Vishnu Kavungal, Qiang Wu, Yuliya Semenova

Conference Papers

This paper presents a novel approach to measurements of low relative humidity (RH) values based on the whispering gallery modes (WGMs) effect in a small silica microsphere coated with a thin layer of Agarose hydrogel. The light from a narrow-linewidth tunable laser with a few GHz tuning range is launched into an adiabatic tapered fiber, which excites WGMs in the Agarose layer via evanescent coupling. Adsorption and desorption of water vapor by the Agarose layer in response to changes in ambient humidity lead to changes in the layer’s refractive index, which in turn leads to a spectral shift of the …

Task Complexity, And Operators’ Capabilities As Predictor Of Human Error: Modeling Framework And An Example Of Application, Maria Chiara Leva, Alberto Caimo, Rebecca Duane, Micaela Demichela, Lorenzo Comberti

Conference Papers

This paper presents the initial framework adopted to assess human error in assembly tasks at a large manufacturing company in Ireland. The model to characterize and predict human error presented in this paper is linked conceptually to the model introduced by Rasch (1980), where the probability of a specified outcome is modelled as a logistic function of the difference between the person capacity and item difficulty. The model needs to be modified to take into account an outcome that is not dichotomous and feed into the interaction between two macro factors: (a) Task complexity: that sum-marises all factors contributing to …

Nasis: Nebraska Annual Social Indicators Survey -- Previous Core Items, Bureau Of Sociological Research

Nebraska Annual Social Indicators Survey (NASIS)

The NASIS survey varies from year to year depending on client needs, but every year a core group of items consisting of common demographics and quality of life measures are included. These include, for example, age, sex, education, community satisfaction, etc (for complete list, see below). These items are asked each year to provide key demographic information to all users of NASIS as well as comparability to other social indicator information.

The core items were reduced in 2018 in an effort to keep NASIS costs as low as possible and reduce respondent burden. You can find the current core items …

Sarcopenia During Neoadjuvant Therapy For Oesophageal Cancer: Characterising The Impact On Muscle Strength And Physical Performance, E.M. Guinan, Suzanne Doyle, A.E. Bennett, L. O'Neill, J. Gannon, J.A. Elliott, J. O'Sullivan, J.V. Reynolds, J. Hussey

Articles

Purpose Preoperative chemo(radio)therapy for oesophageal cancer (OC) may have an attritional impact on body composition and functional status, impacting postoperative outcome. Physical decline with skeletal muscle loss has not been previously characterised in OC and may be amenable to physical rehabilitation. This study characterises skeletal muscle mass and physical performance from diagnosis to post-neoadjuvant therapy in patients undergoing preoperative chemo(radio)therapy for OC.

Methods Measures of body composition (axial computerised tomography), muscle strength (handgrip), functional capacity (walking distance), anthropometry (weight, height and waist circumference), physical activity, quality-of-life and nutritional status were captured prospectively. Sarcopenia status was defined as pre-sarcopenic (low muscle …

Philanthropy’S Quest For Equity, Juan R. Olivarez

Research, Reports, and Publications

No abstract provided.

Governments And Nonprofits: New Partnerships Or Paradigm Shifts?, Kyle Caldwell

Research, Reports, and Publications

No abstract provided.

How Repealing The Johnson Amendment Could Change The Game For Nonprofits, Kyle Caldwell, Matthew Downey

Research, Reports, and Publications

No abstract provided.

Lessons From Case Study Of Secured Transactions With Bitcoin, Xuan-Thao Nguyen

Articles

There has been some discussion about the flaws in using secured transactions law, Article 9 of the Uniform Commercial Code (U.C.C.), to govern commercial transactions involving Bitcoins as collateral. Flaws necessitate the urgency of immediately fixing of the existing law. In the case of Bitcoins there is still much to learn about the marketplace for secured transactions with Bitcoins as collateral. The rapid change in technology, the speed of new ideas proposed, the constant announcements of adoption and adaptation of smart contracts in transactions, the volatility in cryptocurrency value, the endless reports of scams, and the rise of dark pools …

Patent Aversion: An Empirical Study Of Patents Collateral In Bank Lending, Xuan-Thao Nguyen, Erik Hille

Articles

The most valuable assets of many companies today are patents. If patents are valuable, why do banks operating across the United States refuse to lend against patents in commercial lending to reduce their risks? Lending is the primary function of banks. Yet banks have a strong aversion to accept patents as collateral, rendering the vast number of patents as idle assets. This empirical study is the first to identify the patent aversion problem as contrary to the frequent headlines of how valuable patents are to the economy. By carefully extracting relevant patent and security interest filings data and examining the …

Empowering Portland's Youth To Choose Car-Free Mobility, Autumn Shafer, Jared Macary

TREC Project Briefs

Little is known from research about how to motivate youth to choose non-car mobility, especially specific Portland-area youth. Understanding the current attitudes, beliefs, and behaviors of youth in relation to non-car mobility contributes to the sustainability of a long-term transportation system. Transportation system-related beliefs and behaviors of youth are likely to influence their willingness to access and support transportation services as adults. Today’s youth are tomorrow’s riders, bikers, walkers, voters, and transportation planners. Thus, it is important to develop age-appropriate messaging strategies and tactics that promote youth non-car mobility.

This project seeks to build on the sparse national and non-Portland …

Natural Resource Access Rights And Wrongs: Nontimber Forest Products Gathering In Urban Environments, Susan Charnley, Rebecca J. Mclain, Melissa R. Poe

Institute for Sustainable Solutions Publications and Presentations

This article uses research about non-timber forest products (NTFP) gathering in Seattle, Washington, USA to examine how people gain access to natural resources in urban environments. Our analysis focuses on gathering in three spaces: parks, yards, and public rights of way. We present a framework for conceptualizing access, and highlight cognitive mechanisms of access associated with foragers’ internal moral judgments about harvesting. Key findings are: (1) internal moral calculations about whether it is right or wrong to harvest a particular NTFP in a particular place are an important but previously unacknowledged mechanism governing resource access; and (2) these calculations may …

Rockwood 10 An Asset-Based Model For Community Housing, Portland State University. Center For Public Interest Design, Sergio Palleroni, Todd Ferry, Molly Esteve

Center for Public Interest Design Projects

At the initiation of Community Development Partners, this study is done in support of the possibility of a housing community within the town center of Rockwood. The development of the Rockwood 10 will support the community’s increasing need for high-quality and accessible family-sized housing as populations move east from the Portland-Metro Area, as well as support the larger needs and extraordinary cultural diversity of Rockwood. We recognize that the vitality of housing depends on its comprehensive support of its residents and the greater community.

Rockwood is positioned at the meeting point of the City of Gresham’s westernmost boundary and Portland’s …

A Parallel Mesh Generator In 3d/4d, Kirill Voronin

Portland Institute for Computational Science Publications

In the report a parallel mesh generator in 3d/4d is presented. The mesh generator was developed as a part of the research project on space-time discretizations for partial differential equations in the least-squares setting. The generator is capable of constructing meshes for space-time cylinders built on an arbitrary 3d space mesh in parallel. The parallel implementation was created in the form of an extension of the finite element software MFEM. The code is publicly available in the Github repository