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2021

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Full-Text Articles in Public Health

Perceptions Of Caregivers Of Parkinson's Patients Regarding Using Advance Directives, Meghan Morgan Jan 2021

Perceptions Of Caregivers Of Parkinson's Patients Regarding Using Advance Directives, Meghan Morgan

Walden Dissertations and Doctoral Studies

The increasing focus on end-of-life (EOL) care is influencing the role of advance directive (AD) documents. Difficult conversations among family caregivers and their loved ones are becoming more and more critical. Considering the value of communicating EOL wishes, family caregivers’ perceptions about ADs for their loved ones with Parkinson’s disease (PD) must be examined. Using the theory of planned behavior (TPB) as a foundation, the purpose of this generic qualitative study was to understand family caregivers of PD patients and their perceptions and experiences relating to AD documents. This study involved using purposeful sampling and semi-structured interviews with 11 family …


Reproductive Health Factors And Maternal Mortality Of Internally Displaced Women In Nigeria, Fatima Mahmood Jibirilla Jan 2021

Reproductive Health Factors And Maternal Mortality Of Internally Displaced Women In Nigeria, Fatima Mahmood Jibirilla

Walden Dissertations and Doctoral Studies

Approximately 529,000 women die from pregnancy-related causes every year, with 99% of these maternal deaths occurring in developing countries. Each year, about 59,000 maternal deaths occur in Nigeria, with a mortality rate of 576 deaths per 100,000 births. Women constitute about half of the 33.2 million internally displaced persons (IDPs) worldwide. The purpose of this retrospective cross-sectional study was to explore the association between the reproductive health factors and maternal mortality of internally displaced women in Borno state, Nigeria. McCarthy and Maine’s model for determinants of maternal mortality informed this study. A secondary dataset of 400 women (age 14-49 years) …


Relationship Between Trust, Race, And Health Care Information Sources Among African American Men, Uzochukwu Onukogu Jan 2021

Relationship Between Trust, Race, And Health Care Information Sources Among African American Men, Uzochukwu Onukogu

Walden Dissertations and Doctoral Studies

AbstractAfrican American men have not been sufficiently at the center of research studies, especially when it comes to health. Most researchers have explored African Americans as a whole, and few have looked at African American men specifically, especially when it comes to their perceptions and ability to trust sources of health information. The purpose of this quantitative cross-sectional study was to examine the relationship between race and trust in health information sources, including the relationship between prostate cancer health outreach done through the internet and the acceptance of such information outreach among African American men. The theory of planned behavior …


Knowledge And Perceptions Of Antibiotic Resistance Stewardship Among Prehealth And Agriculture Students, Claudia Maria Da Silva Carvalho Jan 2021

Knowledge And Perceptions Of Antibiotic Resistance Stewardship Among Prehealth And Agriculture Students, Claudia Maria Da Silva Carvalho

Walden Dissertations and Doctoral Studies

The global threat of antibiotic resistant infection has resulted in health organizations to compile an antibiotic stewardship program, in which the education of current/future medical prescribers and farmers is central for the preservation of current and future antimicrobial treatments. The purpose of this study was to assess and compare the knowledge and perceived threat of antibiotic and antibiotic resistance, as well as the perceived benefit of antibiotic stewardship, among undergraduate students in biology and agriculture at a state university in Kansas. Framed by the health belief model, a cross-sectional study was conducted using a structured online survey of 136 undergraduate …


Exploring The Influences Of Culture On Hand-Hygiene Beliefs Of Foreign-Born Healthcare Workers, Sheila Blanche Davis Jan 2021

Exploring The Influences Of Culture On Hand-Hygiene Beliefs Of Foreign-Born Healthcare Workers, Sheila Blanche Davis

Walden Dissertations and Doctoral Studies

AbstractThe hand-hygiene practices of nonadherent health care workers (HCWs) are a major threat to patient safety and thus continue to be a concern for healthcare leaders and administrators worldwide. Healthcare-associated infections (HAIs), which are linked to HCWs' unclean hands, are prevalent throughout global healthcare settings. Global migration in the nursing profession and intercontinental travel among direct patient care providers make it challenging for healthcare leaders to sustain HCWs' adherence to hand-hygiene practices. The purpose of this grounded study was to explore the influence of the cultural beliefs about hand-hygiene practices of foreign-born HCWs. The theory of planned behavior was used …


Leadership, Quality Improvement, Team Functionality, And Hiv Viral Load Suppression In Uganda, Esther Karungi Karamagi Nkolo Jan 2021

Leadership, Quality Improvement, Team Functionality, And Hiv Viral Load Suppression In Uganda, Esther Karungi Karamagi Nkolo

Walden Dissertations and Doctoral Studies

Low viral load suppression rate is a significant public health issue in Uganda and similar countries. A nationwide quality improvement (QI) initiative was implemented from January 2019 to improve viral load suppression. Although QI team characteristics have been shown to influence the success of such QI initiatives, no studies have been found to understand how they influence the success of QI efforts to improve HIV viral load suppression in Uganda. The purpose of this cross-sectional, quantitative study was to determine whether there is a significant association between HIV clinic leader involvement in QI teams, QI team functionality, QI team diversity, …


The Impact Of Socioeconomic Status And Ethnicity On Chronic Obstructive Pulmonary Disease Patients, Donald Garret Abshier Jan 2021

The Impact Of Socioeconomic Status And Ethnicity On Chronic Obstructive Pulmonary Disease Patients, Donald Garret Abshier

Walden Dissertations and Doctoral Studies

Chronic obstructive pulmonary disease (COPD) is a progressive and debilitating respiratory condition that leads to significant medial and financial burdens. For many patients with COPD, multiple socioeconomic factors contribute to health disparities, including income, education, employment status, and race/ethnicity. The purpose of this study was to examine the impact of SES and race/ethnicity on COPD patients. For this cross-sectional study, using secondary data analysis, the Social-Ecological Model (SEM), which discusses five levels of influence, was utilized. Data from over 3,222 participants aged 18 and over, living in Nevada were obtained from the 2018 Behavioral Risk Factor Surveillance System (BRFSS) study. …


Melanoma Cancer Survivors: An Online Community Perspective And Prevention Effort, Lisa Marie Chung Jan 2021

Melanoma Cancer Survivors: An Online Community Perspective And Prevention Effort, Lisa Marie Chung

Walden Dissertations and Doctoral Studies

AbstractMelanoma cancer is a major public health issue and has been associated with tanning and exposure to ultraviolet radiation. Minimal information is known about prevention efforts specific to survivors of melanoma cancer who participate in an online community. Surveys of this community differ from previous research of individuals through nononline research; the online community is more likely to be younger in age, comfortable seeking health information using Internet resources, and more advanced in technological capabilities. The main aim of this cross-sectional study was to investigate the impact of age, gender, and race on melanoma prevention efforts (health maintenance and skin …


Drug-Resistant Neisseria Gonorrhoeae; Identification Of At-Risk Groups In Florida By Regional Variation, Scott August Herber Jan 2021

Drug-Resistant Neisseria Gonorrhoeae; Identification Of At-Risk Groups In Florida By Regional Variation, Scott August Herber

Walden Dissertations and Doctoral Studies

Neisseria gonorrhoeae has been on the rise in the State of Florida since 2013. Florida currently follows the Centers for Disease Control and Prevention guidelines for identifying those at-risk for gonorrhea and drug resistant gonorrhea infections. These groups are narrowly defined and do not consider the different population dynamics throughout the State. This study examined the question of who is at-risk for contracting drug resistant strains of gonorrhea in the eight different regions of Florida based on the prescribed use of last-line-of-antibiotic-defense. Florida’s Surveillance Tools and Reporting System provided 12 years of secondary data from 2007 to 2018. The data …


Mental Health Literacy Among Rural And Urban Young Adults In Zambia, Etta Y. Mwambwa-Johnson Jan 2021

Mental Health Literacy Among Rural And Urban Young Adults In Zambia, Etta Y. Mwambwa-Johnson

Walden Dissertations and Doctoral Studies

Misconceptions that negatively influence attitudes and beliefs about mental illness are still prevalent in Zambia. Researchers have reported that young adults are the most impacted population for mental disorders in Zambia. Researchers have also highlighted mental health literacy (MHL) as a useful strategy for influencing positive attitudes and beliefs about mental disorders. The purpose of this quantitative cross-sectional study was to investigate the relationship between levels of MHL and attitudes and beliefs about mental illness and health-seeking behaviors of Zambian young adults aged 18 to 24. The study used the health belief theoretical model. A MHL questionnaire was used to …


The Impact Of Obesity, Race, Age, Education, Income, And Healthcare Coverage On Cervical Cancer Screening Among Mississippi Women, Henrietta Tamika Ross Jan 2021

The Impact Of Obesity, Race, Age, Education, Income, And Healthcare Coverage On Cervical Cancer Screening Among Mississippi Women, Henrietta Tamika Ross

Walden Dissertations and Doctoral Studies

The human papilloma virus is the necessary agent in the development of cervical cancer. It is through screening exams like the Papanicolaou (Pap) test that cervical changes can be identified, and cervical cancer can be diagnosed in the early stage of cancer. The Pap test has aided in decreasing the rate of cervical cancer and the morbidity of cervical cancer. However, cervical cancer rates and mortality rates from cervical cancer are still the highest among women in Mississippi. Additionally, obesity rates among those who reside in Mississippi are the second highest in the United States. The purpose of this quantitative …


Effects Of Hepatitis On Human Immunodeficiency Virus Viral Suppression, Andrenita Checoby West Jan 2021

Effects Of Hepatitis On Human Immunodeficiency Virus Viral Suppression, Andrenita Checoby West

Walden Dissertations and Doctoral Studies

Coinfection with human immunodeficiency virus (HIV) and viral hepatitis leads to unfavorable health outcomes, making treatment of HIV difficult and increasing the odds of HIV transmission. The purpose of this study is to assess whether viral hepatitis (B and C) hinders HIV viral suppression and impacts the white blood cell count (CD4) when a person is concurrently infected with both viruses. The syndemics theory guided this study. Two research questions tested whether there was an association between coinfection with viral hepatitis and HIV viral load suppression. The research design was quantitative case-control with secondary data from 65,626 reports of HIV, …


Cost-Effectiveness Of Alternative Hiv Testing Strategies Among Hard-To-Reach Populations In East And Southern Africa., Deo Mujwara, Deo Mujwara Jan 2021

Cost-Effectiveness Of Alternative Hiv Testing Strategies Among Hard-To-Reach Populations In East And Southern Africa., Deo Mujwara, Deo Mujwara

Graduate Research Posters

No abstract provided.


Covid-10, Healthcare Interior Design + Provider Experience - How Does Your Space Work For You?, Ruth E.P. Deibler Jan 2021

Covid-10, Healthcare Interior Design + Provider Experience - How Does Your Space Work For You?, Ruth E.P. Deibler

Graduate Research Posters

The lack of research on healthcare staff experience and interior design of the spaces they work in is evident. A focus on staff perspective is needed, particularly staff who navigated the COVID-19 pandemic. This research seeks to capture those stories to develop further research in order to improve staff experience. The initial phase of this mixed-methods approach is a survey. Hypothetically, by placing providers at the center of qualitative research related to healthcare interior design, we can better understand existing healthcare spaces. Ideally, we can develop additional evidence-based, human-centered solutions to transform interior environments in healthcare.

The 20-year Women’s Health …


Modeling Longitudinal Change In Cervical Length Across Pregnancy, Hope M. Wolf, Shawn J. Latendresse, Jerome F. Strauss Iii, Timothy P. York Jan 2021

Modeling Longitudinal Change In Cervical Length Across Pregnancy, Hope M. Wolf, Shawn J. Latendresse, Jerome F. Strauss Iii, Timothy P. York

Graduate Research Posters

Introduction: A short cervix (cervical length < 25 mm) in the mid-trimester (18 to 24 weeks) of pregnancy is a powerful predictor of spontaneous preterm delivery (gestational age at delivery < 37 weeks). Although the biological mechanisms of cervical remodeling have been the subject of extensive investigation, very little is known about the rate of change in cervical length over the course of a pregnancy, or the extent to which rapid cervical shortening increases maternal risk for spontaneous preterm delivery.

Methods: A cohort of 5,160 unique women carrying 5,971 singleton pregnancies provided two or more measurements of cervical length during pregnancy. Cervical length was measured in millimeters using a transvaginal 12-3 MHz ultrasound endocavity probe (SuperSonic Imagine). Maternal characteristics, including relevant medical history and birth outcome data, were collected for each participant. Gestational age at delivery was measured from the first day of each woman’s last menstrual period and confirmed by ultrasound. Repeated measurements of cervical length during pregnancy were modeled as a longitudinal, multilevel growth curve in MPlus. A three-level variance structure was …


Association Of Incident Cancer To Low-Value Care And Healthcare Cost Burden Among Elderly Medicare Beneficiaries, Chibuzo Iloabuchi Jan 2021

Association Of Incident Cancer To Low-Value Care And Healthcare Cost Burden Among Elderly Medicare Beneficiaries, Chibuzo Iloabuchi

Graduate Theses, Dissertations, and Problem Reports (ETD)

In the United States (US), 25% of healthcare spending is considered wasteful because it is spent reimbursing low-value care. Low-value care is the utilization of healthcare services, medical tests, and procedures that have unclear or no clinical benefit to patients but still exposes them to risk. World-wide, low-value care imposes a significant economic burden on patients, payers, governments, and society. Cancer care among older adults > 65 years is one of the biggest drivers of healthcare expenditure in the US and accounts for nearly 40% of all spending, and low-value care among cancer patients is prevalent and contributes to the financial …


S’Poreans Are Feeling Betrayed Because Of Tracetogether. The Government Needs To Restore Trust, Tan K. B. Eugene Jan 2021

S’Poreans Are Feeling Betrayed Because Of Tracetogether. The Government Needs To Restore Trust, Tan K. B. Eugene

Research Collection Yong Pung How School Of Law

The authorities previously assured citizens that the TT data "will only be used for contact tracing", but subsequently indicated that the data may be used for criminal investigations. TT is the vital tool in our fight against the pandemic as it helps with contact tracing. It is in the government's interest to ensure optimal usage of TT. Some are now feeling that the government has "betrayed" their trust, so public confidence in using TraceTogether must be restored.


Effects Of Resistance Training On Muscle Quality Index, Muscle Strength, Functional Capacity, And Serum Immunoglobulin Levels Between Obese And Non-Obese Older Women, Paulo Roberto Silva Junior, Dahan Da Cunha Nascimento, Ivo Vieira De Sousa Neto, Silvana Schwerz Funghetto, Ramires Alsamir Tibana, James W. Navalta, Fabiani Lage Rodrigues Beal, Jonato Prestes Jan 2021

Effects Of Resistance Training On Muscle Quality Index, Muscle Strength, Functional Capacity, And Serum Immunoglobulin Levels Between Obese And Non-Obese Older Women, Paulo Roberto Silva Junior, Dahan Da Cunha Nascimento, Ivo Vieira De Sousa Neto, Silvana Schwerz Funghetto, Ramires Alsamir Tibana, James W. Navalta, Fabiani Lage Rodrigues Beal, Jonato Prestes

Kinesiology and Nutrition Sciences Faculty Research

International Journal of Exercise Science 14(7): 707-726, 2021. Considering the negative impact of obesity on neuromuscular and immune systems, we sought to compare the effects of a 10-week resistance training (RT) program on muscle quality index (MQI), muscle strength, functional capacity, and immunoglobulins in older women with and without obesity. Thirty-nine older women participated in the present study (age: 69.02 ± 6.16, fat (%): 38.80% ± 6.28) and underwent a linear RT program performed on two non-consecutive days of the week. Body composition, functional tests, immunoglobulins, muscle quality of upper and lower limbs and absolute muscular strength of the upper …


2018 Statewide Child Death Report, Nevada Institute For Children’S Research And Policy, Dawn L. Davidson, Elizabeth Holka Jan 2021

2018 Statewide Child Death Report, Nevada Institute For Children’S Research And Policy, Dawn L. Davidson, Elizabeth Holka

Nevada Institute for Children's Research and Policy Reports

The purpose of this report is to provide comprehensive information regarding the circumstances by which children die in Nevada in order to prevent future child deaths and improve the health and safety of children in the state.


Principle Of An Acoustical Method For Estimating The Centroid Position Of The Earcanal Wall Normal Velocity Induced By Bone-Conducted Stimulation: Numerical Evaluation, Kevin Carillo, Olivier Doutres, Franck Sgard Jan 2021

Principle Of An Acoustical Method For Estimating The Centroid Position Of The Earcanal Wall Normal Velocity Induced By Bone-Conducted Stimulation: Numerical Evaluation, Kevin Carillo, Olivier Doutres, Franck Sgard

Études primaires

The occlusion effect is commonly experienced as the altered perception of one’s own physiological noise when the earcanal entrance is blocked. Objectively, this phenomenon corresponds to an acoustic pressure increase in the occluded earcanal. The occlusion effect originates from the earcanal wall normal vibration and depends on the spatial distribution of the latter. At low frequencies, this spatial distribution can be characterized by the position of its centroid along the earcanal middle axis. This paper describes the principle of an acoustical method for estimating this centroid position at low frequencies. The proposed method consists in measuring the eardrum acoustic pressure …


In Vitro And In Vivo Toxicological Evaluation Of Emissions From The Fused Filament Fabrication Three-Dimensional Printing, Mariana T. Farcas Jan 2021

In Vitro And In Vivo Toxicological Evaluation Of Emissions From The Fused Filament Fabrication Three-Dimensional Printing, Mariana T. Farcas

Graduate Theses, Dissertations, and Problem Reports (ETD)

Fused filament fabrication (FFF), a three-dimensional (3-D) printing process, is an emerging technology that has recently gained wide popularity among both consumers and manufacturers. As filament is heated to above its glass transition temperature in a 3-D printer, a portion may undergo thermal decompostion, which releases ultrafine particles (UFP) and volatile organic compounds (VOCs) with potential adverse respiratory health effects are released into the air. This study's central hypotheses is that emissions generated during 3-D printing are toxic and exposure to these emissions induces pulmonary and systemic adverse health effects. Considering that currently, limited understanding is available on the health …


Economic Burden Of Low-Value Healthcare On Patients With Localized Prostate Cancer: Statistical & Machine Learning Approaches, Ryan Fiano Jan 2021

Economic Burden Of Low-Value Healthcare On Patients With Localized Prostate Cancer: Statistical & Machine Learning Approaches, Ryan Fiano

Graduate Theses, Dissertations, and Problem Reports (ETD)

Adults with incident localized prostate cancer represent a large, medically complex population at risk for low-value care. Evidence-based guidelines recommend conservative management (CM) for localized prostate cancer patients with multimorbidity and limited life expectancy, however, 2 in 3 still choose treatment. This dissertation pursued three Aims to address research gaps related to healthcare practices associated with significant morbidity and economic burden on older men with incident localized prostate cancer: 1) examine the leading predictors of low-value healthcare practice of prostate cancer treatment for low-risk prostate cancer; 2) assess the role of patient‐reported experience with care on high-value prostate cancer management; …


Perceptions Of Integrated Mental And Behavioral Health In Pediatric Specialty Care Settings: A Mixed-Methods Study, Desireé Nicole Williford Jan 2021

Perceptions Of Integrated Mental And Behavioral Health In Pediatric Specialty Care Settings: A Mixed-Methods Study, Desireé Nicole Williford

Graduate Theses, Dissertations, and Problem Reports (ETD)

Pediatric patients are at an increased risk of experiencing mental and behavioral health concerns, which have direct associations with HRQOL, physiological health, and likelihood that youth will engage in health promoting behavior. Researchers and practitioners have increased their awareness of these concerns and identified strategies for improving the mental and behavioral health of these youth, specifically via implementing organizational efforts (i.e., task forces) and guidelines around integrating psychosocial screening and other services into routine practice. Despite this, there are several identified barriers to families receiving mental/behavioral health care in these settings. These barriers exist at all levels, including at the …


An In-Depth Exploration Of Hospital-Based Physical And Occupational Therapists’ Needs, Perceptions And Participation In A Safe Patient Handling And Mobility Program, Kimeran W. Evans Jan 2021

An In-Depth Exploration Of Hospital-Based Physical And Occupational Therapists’ Needs, Perceptions And Participation In A Safe Patient Handling And Mobility Program, Kimeran W. Evans

Graduate Theses, Dissertations, and Problem Reports (ETD)

Introduction - Patient mobility performed in the hospital setting places healthcare workers at high risk for WMSDs. The healthcare industry has responded through the creation of SPHM programs that are successful in reducing work-related injuries broadly. However, less is known about the distinct experiences of rehabilitation professionals. Therefore, an in depth exploration of the perceptions, participation, and needs pertaining to lift equipment usage among rehabilitation professionals was performed.

Methods – A qualitative case study approach explored this bounded system. Six focus groups were conducted with 25 members of the rehabilitation team and three interviews were conducted with key administrative personnel. …


Quantification Of Bacterial Shedding From The Respiratory Tract Of Health Care Workers Wearing Paprs And Other Types Of Air-Purifying Respirators On Sterile Conditions In A Simulated Operating Rooms (Ors), Segun Olanrewaju Ajewole Jan 2021

Quantification Of Bacterial Shedding From The Respiratory Tract Of Health Care Workers Wearing Paprs And Other Types Of Air-Purifying Respirators On Sterile Conditions In A Simulated Operating Rooms (Ors), Segun Olanrewaju Ajewole

Graduate Theses, Dissertations, and Problem Reports (ETD)

The role of powered air- purifying respirators (PAPRs) in healthcare settings during infectious diseases outbreaks and highly contagious pathogens (e.g., SARS, HINI, Ebola, COVID etc.) has attracted much interest based on the level of respiratory protection they provide and their many positive user features. A common practice among healthcare workers to minimize airborne contaminant exposure has been to use surgical masks or N95 filtering facepiece respirators (FFRs). Surgical masks have been shown to offer minimal respiratory protection and while N95 FFRs offer better respiratory protection, they are not comfortable to use for a prolonged period. With current PAPR designs, exhaled …


Hands And Health: Quantifying Occupational Exposures And Implications Of Disability, Sueann R. Woods Jan 2021

Hands And Health: Quantifying Occupational Exposures And Implications Of Disability, Sueann R. Woods

Graduate Theses, Dissertations, and Problem Reports (ETD)

Introduction: Hand grip strength (HGS) has been negatively correlated with both biologic, cognitive, and mental health markers. Aim one investigated how occupational metabolic equivalents (OMETs), impacted HGS. Aim two investigated lost time from work and the association with HGS. Finally, aim three investigated the health outcomes of workers’ compensation claimants who have lost time from work, following diagnosis of CTS.

Results:HGS was positively associated with OMET (rs = 0.078, p = 0.009). Linear regression model demonstrated a statistically significant association between HGS and OMETs, F(1, 31) = 9.735, p = .001. Aim two found that all occupation groups had …


Combined Influence Of Transfer Distance, Pace, Handled Mass And Box Height On Spine Loading And Posture, Xavier Robert-Lachaine, Philippe Corbeil, Antoine Muller, Jasmin Vallée-Marcotte, Hakim Mecheri, Denys Denis, André Plamondon Jan 2021

Combined Influence Of Transfer Distance, Pace, Handled Mass And Box Height On Spine Loading And Posture, Xavier Robert-Lachaine, Philippe Corbeil, Antoine Muller, Jasmin Vallée-Marcotte, Hakim Mecheri, Denys Denis, André Plamondon

Études primaires

Work-related low back disorders are commonly associated with handling tasks. The objective of this study was to determine the combined influence of distance, pace, handled mass and height, on back loading and posture during free box transfer. Kinematics and kinetics of 17 handlers were recorded during a box transfer task between two pallets. Four-way repeated measures ANOVA were conducted on four lift-deposit height conditions (from lift and deposit of 0.16 or 1.16 m), three distances between pallets (1.5, 1.0 and 0.5 m), two handled masses (10 and 20 kg) and two paces (free and faster). The interaction between distance and …


Combined Puncture And Cutting Of Soft-Coated Fabrics By A Pointed Blade: Energy, Force, And Stress Failure Criteria, Ennouri Triki, Chantal Gauvin Jan 2021

Combined Puncture And Cutting Of Soft-Coated Fabrics By A Pointed Blade: Energy, Force, And Stress Failure Criteria, Ennouri Triki, Chantal Gauvin

Études primaires

Soft elastomer-coated fabrics are widely used in engineering and protective applications. Puncture cutting by sharp-tipped objects is one of the most common failure modes of protective gloves made of coated fabrics. In order to investigate the puncture-cutting process of soft elastomer-coated fabrics, we studied the mechanisms and mechanics of pointed-blade insertion into specimens cut out from four protective gloves. Experimental and analytical analyses showed that total energy and critical puncture-cutting force calculated analytically are both able to predict the puncture-cutting resistance of soft elastomer-coated fabrics measured experimentally. Total energy is obtained from the relationship between the puncture-cutting work and the …


Leakage Versus Material Filtration In Barrier Facemask Efficiency, Ali Bahloul, Clothilde Brochot, Barbara Layne Jan 2021

Leakage Versus Material Filtration In Barrier Facemask Efficiency, Ali Bahloul, Clothilde Brochot, Barbara Layne

Études primaires

The World Health Association and many governmental agencies recommend the wearing of facemasks by the general public to prevent the spread of COVID-19. It is believed that masks can significantly protect others and may offer some protection to the wearer. Although there are standards for FFRs, surgical masks, and recently for barrier face coverings, they all indicate the level of protection for the wearer. However, testing facial masks not at the point of inhalation, but at the source, the exhale, offers a new perspective on how to impede particle emissions. In this paper, the experimental results show that, although the …


Numerical Investigation Of The Earplug Contribution To The Low-Frequency Objective Occlusion Effect Induced By Bone-Conducted Stimulation, Kevin Carillo, Olivier Doutres, Franck Sgard Jan 2021

Numerical Investigation Of The Earplug Contribution To The Low-Frequency Objective Occlusion Effect Induced By Bone-Conducted Stimulation, Kevin Carillo, Olivier Doutres, Franck Sgard

Études primaires

The use of earplugs is commonly associated with an increased perception of the bone-conducted part of one's own physiological noise. This phenomenon is referred to as occlusion effect and is most prominent at low frequencies. Several factors influence the occlusion effect, such as the ear anatomy; the bone-conducted stimulation; and the type of occlusion device and its fit, insertion depth, and material properties. The latter factor is of great interest to potentially reduce the occlusion effect of passive earplugs. This paper investigates the mechanism(s) of contribution of earplugs to the objective occlusion effect. A two-dimensional axi-symmetric finite element model of …