Browsing ETD -- Doctoral Dissertations by Title
Now showing items 4427-4446 of 4630
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U.S. Labor Dynamics in the 21st Century
(Johns Hopkins UniversityUSA, 2016-10-04)This dissertation is composed of three chapters. In the first chapter, I investigate the trend reversal in the labor supply of single childless women that occurred at the turn of the 21st century and its continued decline ... -
U.S. Seasonal Worker Policies: What changes can the U.S. immigration authorities make to the H-2B visa program to more effectively address employers’ needs?
(Johns Hopkins UniversityUSA, 2021-09-07)Although international labor mobility represents one of the most effective ways of addressing worker scarcity in high-income countries, growing anti-immigration attitudes have made it difficult to advocate in favor of ... -
UBE3A and Angelman syndrome: a substrate perspective
(Johns Hopkins UniversityUSA, 2017-05-19)Angelman syndrome (AS) is a human developmental disorder that presents with ataxia, seizures, and major cognitive impairments [1]. Through human genetic studies, it was found that the loss of function of a single ubiquitin ... -
ULTRA-SENSITIVITY OF CELL ADHESION IN A MECHANICALLY HETEROGENOUS ENVIRONMENT
(Johns Hopkins UniversityUSA, 2016-08-18)Cell adhesion regulates critical cellular functions in adherent cells. Yet, the fundamental mechanism during the early events in cell adhesion remains unclear. At the most elementary level, cell processes its environment ... -
ULTRAFAST EXCITED-STATE STRUCTURAL DYNAMICS AND CHARGE TRANSFER IN PHOTORESPONSIVE CONJUGATED MOLECULAR MATERIALS
(Johns Hopkins UniversityUSA, 2016-09-06)As many fundamental light-induced photochemical processes, e.g. isomerization, intramolecular electron or hydrogen transfer, happen on timescales ranging from femtoseconds to picoseconds, further understanding of these ... -
Ultrafast spectroscopic interrogation of structural dynamics and disorder of excited states in conjugated organic polymers
(Johns Hopkins UniversityUSA, 2016-10-10)The spectroscopy and dynamics of conjugated polymers have been widely studied in recent years, but there is limited empirical data that directly probes the role of structural dynamics and changes in conjugation length that ... -
Umm el-Marra and the Western Expansion of the Mittani Empire in Northwestern Syria
(Johns Hopkins University, 2014-03-21)The Bronze Age occupation of Umm el-Marra, a medium-sized regional center in western Syria, lasted, with varying degrees of intensity, for more than a millennium. During this time, the communities who inhabited the site ... -
UNCERTAINTY QUANTIFICATION FROM SMALL DATA: A MULTIMODEL APPROACH
(Johns Hopkins UniversityUSA, 2018-08-13)As a central area of computational science and engineering (CSE), uncertainty quantification (UQ) is playing an increasingly important role in computationally evaluating the performance of complex mathematical, physical ... -
Uncovering hidden protein states using optical tweezers
(Johns Hopkins UniversityUSA, 2021-06-24)The bedrock of science is observation, which is used to establish models, theories, and laws to explain the universe. The accuracy of these explanations can be limited and require refinements. The study of proteins, molecular ... -
Uncovering Novel Insights into Retinal Diseases Using Single-Cell Transcriptional Profiling
(Johns Hopkins UniversityUSA, 2019-06-17)Droplet-based single-cell RNA sequencing (scRNAseq) has emerged as a powerful tool to simultaneously profile the transcriptomes of tens of thousands of cells in the same tissue. In this thesis, I utilized scRNAseq to profile ... -
UNCOVERING THE EPIDEMIOLOGY OF COVID-19: JUST-IN-TIME SCIENCE IN A PANDEMIC
(Johns Hopkins UniversityUSA, 2020-10-30)COVID-19 pandemic has led to over 30 million reported cases 10 month after it was first detected. This dissertation presents results generated as the pandemic emerged to better understand the epidemiology of the disease, ... -
Under Control: Constructing the Nerve Centers of the Cold War
(Johns Hopkins UniversityUSA, 2016-02-18)Cold War architecture reveals narratives of both faith and fatalism. American federal agencies, such as the Department of Defense and NASA, financed the creation of command and control centers that operated in digital, ... -
UNDER-5 MORTALITY ESTIMATION IN HUMANITARIAN EMERGENCIES: A COMPARISON OF ESTIMATION METHODOLOGIES USING MICROSIMULATION
(Johns Hopkins University, 2014-05-27)Complex humanitarian emergencies are characterized by increases in mortality, mass migration, and collapse of infrastructure. Demographic estimation on under-5 mortality in these settings is generally conducted using ... -
UNDERINSURANCE AMONG CHILDREN IN THE UNITED STATES: IMPLICATIONS OF MEASUREMENT APPROACHES
(Johns Hopkins UniversityUSA, 2021-09-10)Background: Assessments of underinsurance among children in the United States (US) lack a consistent measurement approach, and previous studies to compare distinct measurement approaches lack methodological rigor and ... -
Undersongs: Left Elegies and the Politics of Community, 1940-1965
(Johns Hopkins UniversityUSA, 2017-08-21)The years between 1940 and 1965 constitute a comparatively dormant era in the history of radical political activity in the United States—a brief interval that begins in the fading light of widespread labor organizing and ... -
Understanding and Measuring Responsiveness of Human Resources for Health in Rural Bangladesh
(Johns Hopkins UniversityUSA, 2015-08-21)Introduction Responsiveness of human resources for health (HRH) is defined as the social actions that health providers do to meet the legitimate expectations of service seekers. Lack of responsiveness may dissuade patients ... -
Understanding and Predicting Cancer Cell Aggressiveness From Their Migratory Phenotypes
(Johns Hopkins UniversityUSA, 2019-05-03)Cell migration is an integral process for diverse physiological and pathological processes, including embryonic and tissue development, wound healing, immune response, chronic inflammation and cancer metastasis. Cancer ... -
Understanding cellular interactions and the immunobiology of the malaria liver stage
(Johns Hopkins UniversityUSA, 2017-10-09)Malaria is a devastating disease killing over 400,000 people every year, mainly children under the age of 5. The Plasmodium parasite responsible for this disease exhibits a complex life cycle with many stages; one of these ... -
Understanding Changes in Supply and Demand in Reproductive Health
(Johns Hopkins UniversityUSA, 2014-06-30)Objective. To understand the impact and equity implications of a Reproductive Health (RH) Voucher Program in Kenya, as well as to examine levels and trends of stated barriers to contraceptive use and its associations with ... -
UNDERSTANDING CHILD MARRIAGE DYNAMICS IN HUMANITARIAN SETTINGS IN THE MIDDLE EAST AND SOUTH ASIA
(Johns Hopkins UniversityUSA, 2022-04-22)Problem Statement: While the evidence on child marriage is extensive in stable settings, few studies have systematically examined child marriage in humanitarian settings where girls may be at increased risk of the practice. ...