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Full-Text Articles in Entire DC Network
A Grounded Theory Survey Study Of Teachers Perception Perpetuating The Deficit Narrative About Marginalized Students Of Color, Cavel Austin
A Grounded Theory Survey Study Of Teachers Perception Perpetuating The Deficit Narrative About Marginalized Students Of Color, Cavel Austin
Electronic Theses and Dissertations
The deficit narrative about marginalized students of color attributes their failure in school to some nature of innate cognitive deficiency, cultural, social, and familial dysfunctions among other schools of thoughts. The purpose of this grounded theory study is to provide a rich description about this phenomenon and to propose theoretical pedagogical adjustments in the classroom as it relates to educating students of color. The study applies Charmaz (2014) Constructivist approach to grounded theory methods to examine the following research questions: (RQ1) How do teachers' narratives about students of color depict their teaching experiences and (RQ2) How do teachers' narratives about …
Warrants For Right-Turn Flashing Yellow Arrow Signal Phases, Mohammed Alfawzan
Warrants For Right-Turn Flashing Yellow Arrow Signal Phases, Mohammed Alfawzan
Electronic Theses and Dissertations
The right-turn flashing yellow arrow (FYA) signal phasing is a new signal practice in the United States. The Manual on Uniform Traffic Control Devices MUTCD (2009) allocates a signal phasing section for the right-turn FYA, which requires a four-section head FYA signal. It supports multiple phases' indications that guide the motorist through permissive, protected, and/or permissive/protected phases. For this dissertation, I investigated three permissive right-turn FYA signal phases in various traffic conditions and signal timing circumstances. The first permissive right-turn FYA signal phase is the tight-turn on impeding through (RTOIT) taking place during the cross-street through traffic movement. The second …
Nanoplasmonics In Two-Dimensional Dirac And Three-Dimensional Metallic Nanostructure Systems, Alireza Safaei
Nanoplasmonics In Two-Dimensional Dirac And Three-Dimensional Metallic Nanostructure Systems, Alireza Safaei
Electronic Theses and Dissertations
Surface plasmons are collective oscillation of electrons which are coupled to the incident electric field. Excitation of surface plasmon is a route to engineer the behavior of light in nanometer length scale and amplifying the light-matter interaction. This interaction is an outcome of near-field enhancement close to the metal surface which leads to plasmon damping through radiative decay to outgoing photons and nonradiative decay inside and on the surface of the material to create an electron-hole pair via interband or intraband Landau damping. Plasmonics in Dirac systems such as graphene show novel features due to massless electrons and holes around …
Chemical Vapor Deposition Growth Of Large Area 2d Mos2 Layers: Layer Orientation Control, Heterostructure Integration, And Applications For Stretchable Sensors., Md. Ashraful Islam
Chemical Vapor Deposition Growth Of Large Area 2d Mos2 Layers: Layer Orientation Control, Heterostructure Integration, And Applications For Stretchable Sensors., Md. Ashraful Islam
Electronic Theses and Dissertations
Two-dimensional (2D)-layered MoS2 layers have exhibited a broad set of unusual and superior material properties unattainable in any traditional bulk materials, drawing significant research interests nowadays. For instance, they present excellent semiconducting properties accompanying high carrier mobility and large current ON/OFF ratio as well as extensive in-plane strain limit and thickness, projecting high suitably for emerging flexible and stretchable electronics. Such properties and applications strongly depend on the physical orientation and chemical composition of constituent 2D layers. 2D MoS2 layers chemically grown in two distinct orientations, e.g., horizontal alignment for electronics and optoelectronics, and vertical alignment for electrochemical and sensing …
Novel Solid State Lasers Based On Volume Bragg Gratings, Evan Hale
Novel Solid State Lasers Based On Volume Bragg Gratings, Evan Hale
Electronic Theses and Dissertations
Since their invention in 1960, lasers have revolutionized modern technology, and tremendous amounts of innovation and development has gone into advancing their properties and efficiencies. This dissertation reports on further innovations by presenting novel solid state laser systems based on the volume Bragg gratings (VBGs) and the newly developed holographic phase mask (HPMs) for brightness enhancement, dual wavelength operation, and mode conversion. First, a new optical element was created by pairing the HPM with two surface gratings creating an achromatic holographic phase mask. This new optical device successfully performed transverse mode conversion of multiple narrow line laser sources operating from …
Variation In Prospecting Behavior And Drivers Of Post-Fire Habitat Preference Among Juvenile Florida Scrub-Jays, David Sherer
Variation In Prospecting Behavior And Drivers Of Post-Fire Habitat Preference Among Juvenile Florida Scrub-Jays, David Sherer
Electronic Theses and Dissertations
Florida Scrub-Jays (Aphelocoma coerulescens, FLSJ; federally Threatened) are cooperatively breeding birds endemic to Florida and dependent on fire-maintained xeric oak scrub. FLSJs are year-round residents, highly territorial, and rarely disperse far from their natal territory. Lifetime reproductive success is highest among individuals breeding in early-successional habitat, usually less than 9 to 10 years post-fire. However, because scrub burns infrequently such early-successional, high-quality habitat is extremely limited and competition for it as breeding space is likely intense. Because some birds live long enough to experience habitat succession, FLSJs also occupy later-successional overgrown scrub, even though both survival and fecundity decline. Although …
Context-Centric Affect Recognition From Paralinguistic Features Of Speech, Andreas Marpaung
Context-Centric Affect Recognition From Paralinguistic Features Of Speech, Andreas Marpaung
Electronic Theses and Dissertations
As the field of affect recognition has progressed, many researchers have shifted from having unimodal approaches to multimodal ones. In particular, the trends in paralinguistic speech affect recognition domain have been to integrate other modalities such as facial expression, body posture, gait, and linguistic speech. Our work focuses on integrating contextual knowledge into paralinguistic speech affect recognition. We hypothesize that a framework to recognize affect through paralinguistic features of speech can improve its performance by integrating relevant contextual knowledge. This dissertation describes our research to integrate contextual knowledge into the paralinguistic affect recognition process from acoustic features of speech. We …
Development Of Multiport Single Stage Bidirectional Converter For Photovoltaic And Energy Storage Integration, Amit Bhattacharjee
Development Of Multiport Single Stage Bidirectional Converter For Photovoltaic And Energy Storage Integration, Amit Bhattacharjee
Electronic Theses and Dissertations
The energy market is on the verge of a paradigm shift as the emergence of renewable energy sources over traditional fossil fuel based energy supply has started to become cost competitive and viable. Unfortunately, most of the attractive renewable sources come with inherent challenges such as: intermittency and unreliability. This is problematic for today's stable, day ahead market based power system. Fortunately, it is well established that energy storage devices can compensate for renewable sources shortcomings. This makes the integration of energy storage with the renewable energy sources, one of the biggest challenges of modern distributed generation solution. This work …
High-Dynamic-Range Foveated Near-Eye Display System, Guanjun Tan
High-Dynamic-Range Foveated Near-Eye Display System, Guanjun Tan
Electronic Theses and Dissertations
Wearable near-eye display has found widespread applications in education, gaming, entertainment, engineering, military training, and healthcare, just to name a few. However, the visual experience provided by current near-eye displays still falls short to what we can perceive in the real world. Three major challenges remain to be overcome: 1) limited dynamic range in display brightness and contrast, 2) inadequate angular resolution, and 3) vergence-accommodation conflict (VAC) issue. This dissertation is devoted to addressing these three critical issues from both display panel development and optical system design viewpoints. A high-dynamic-range (HDR) display requires both high peak brightness and excellent dark …
Room Temperature Vox Air-Bridge Bolometer Integrated With Metal-Insulator-Metal Resonant Absorbers, Seth Calhoun
Room Temperature Vox Air-Bridge Bolometer Integrated With Metal-Insulator-Metal Resonant Absorbers, Seth Calhoun
Electronic Theses and Dissertations
Spectrally-selective un-cooled micro-bolometers have many military and industrial applications for infrared sensing and imaging, e.g. target acquisition and chemical analysis. In this work, a micro-bolometer was fabricated with integrated wavelength-selective absorber based on subwavelength metal-insulator-metal (MIM) resonators. The fabricated air-bridge structure used a vanadium oxide thin film as the bolometric element. A novel aqueous deposition method of depositing vanadium oxide was investigated and compared to traditional sputtered vanadium oxide to determine achievable temperature coefficient of resistance. The MIM absorber itself was investigated as a function of the dielectric used, and the strong dependence of the resonance spectrum on dispersion was …
Role Of Tnfα Antagonists And Genetic Polymorphisms In Modulating Susceptibility To Mycobacterial Infection Among Patients With Crohn's Disease, Ahmad Qasem
Electronic Theses and Dissertations
Tumor Necrosis Factor alpha antagonists (anti-TNFα) have been extensively used for Crohn's disease (CD) treatment. Even though they may control CD symptoms initially, treatment response varies among patients, which seems to depend on single nucleotide polymorphisms (SNPs) in TNFα receptors superfamily 1A and 1B (TNFRSF1A/B). Most importantly, M. tuberculosis infection has been strongly associated with these medications, but no studies have elucidated the effects of anti-TNFα on CD associated with MAP (Mycobacterium avium subspecies paratuberculosis; a possible causative agent of CD, and closely related to M. tuberculosis). Here, we investigated the effects of recombinant inflammatory cytokines and anti-TNFα therapeutics on …
The Evaluation Of Classifier Performance On The Forensic Analysis Of Fire Debris And The Expansion Of The Substrate Database, Alyssa Allen
The Evaluation Of Classifier Performance On The Forensic Analysis Of Fire Debris And The Expansion Of The Substrate Database, Alyssa Allen
Electronic Theses and Dissertations
The current protocols in fire debris analysis rely on ignitable liquid pattern recognition and the identification of target compounds. These practices allow fire debris analysts to determine whether a sample contains or is absent of ignitable liquid residue and to classify that type of ignitable liquid based upon subjective thresholds. A statistical approach using computationally mixed datasets was devised in this research to generate an objective approach to the classification of fire debris samples and to determine error rates. Quadratic, linear, and partial least squares linear discriminant analysis (QDA, LDA, and PLS-DA) models were developed and evaluated to determine the …
An Exploration Of Florida Public School Districts' Language Development Programs For Children Before They Enter Kindergarten, Sharon Ochotorena
An Exploration Of Florida Public School Districts' Language Development Programs For Children Before They Enter Kindergarten, Sharon Ochotorena
Electronic Theses and Dissertations
The purpose of the study was to determine the extent to which preschool programs and the 10 research-based components that develop language are present in Florida public school districts. Based on qualitative methods of analysis, the study utilized two primary sources of data collection to answer the two research questions that follow: 1. Of the 67 traditional public school districts in Florida, which have language development programs for children under the age of 5, excluding those subsidized by Part B of the IDEA? 2. How do components of the programs in the sample of school districts that have language development …
Molecular Basis Of Membrane Pore Formation By Amyloid Beta Peptide, Nabin Kandel
Molecular Basis Of Membrane Pore Formation By Amyloid Beta Peptide, Nabin Kandel
Electronic Theses and Dissertations
Alzheimer's Disease (AD) is a neurodegenerative disorder that affects around 50 million people worldwide and causes cognitive decline, brain atrophy and death. Despite extensive basic and clinical studies and drug development efforts, currently no effective treatments are available for AD. The amyloid β (Aβ) peptide is neurotoxic and is tightly associated with AD pathology, but the molecular mechanism of its action remains unclear. There are various forms of Aβ in the brain, ranging from the full length Aβ1-42 to shorter peptides, such as a strongly toxic Aβ25-35 fragment. The Amyloid Cascade Hypothesis (ACH) postulated that extracellular Aβ deposits cause the …
Towards More Reliable Neural Network Learning Models, Navid Kardan
Towards More Reliable Neural Network Learning Models, Navid Kardan
Electronic Theses and Dissertations
Ideally, when a neural network makes a wrong decision or encounters an out-of-distribution example, its predictive confidence should be as low as possible. Three primary contributions in this dissertation address this challenge. The first two contributions are new approaches to mitigate overconfident predictions in modern neural networks. In the first (1), called competitive overcomplete output layer neural networks, several classifiers, as part of the same output layer, are trained simultaneously and later their consensus produces more reliable predictions. The second approach (2) reformulates the original classification problem into several new versions by combining classes together and training a classifier on …
The Impact Of Youths' Digital Citizenship Levels On Their Self-Efficacy, Madison Gannon
The Impact Of Youths' Digital Citizenship Levels On Their Self-Efficacy, Madison Gannon
Electronic Theses and Dissertations
The purpose of this study is to identify youths' levels of digital citizenship, to identify youths' levels of self-efficacy, and to determine the relationship between their digital citizenship levels and their self-efficacy levels. Their digital citizenship levels were determined based on five factors: 1) Ethics for Digital Environment, 2) Fluency for Digital Environment, 3) Reasonable/Critical Decisions, 4) Self-Identity in Digital World, and 5) Social/Cultural Engagement to Society. Their self-efficacy levels were determined based on three factors: 1) Academic Self-efficacy, 2) Social Self-efficacy, and 3) Emotional Self-efficacy. The study has four major phases. First, an in-depth literature review was conducted on …
Ribbeting Results: Emergent Infectious Diseases In Wetland Systems, Ariel Horner
Ribbeting Results: Emergent Infectious Diseases In Wetland Systems, Ariel Horner
Electronic Theses and Dissertations
North American amphibians have recently been impacted by two major emerging pathogens, the fungus Batrachochytrium dendrobatidis (Bd) and iridoviruses in the genus Ranavirus (Rv). Environmental, seasonal and host factors may play important roles in disease dynamics, but few studies incorporate these components into their analyses. Here, we investigated the role of environmental, seasonal, genetic and location effects on driving Bd and Rv infection prevalence and severity in a biodiversity hot spot, the southeastern United States. We used quantitative PCR to characterize Bd and Rv dynamics in natural populations of three amphibian species: Notophthalmus perstriatus, Hyla squirella and Pseudacris ornata and …
Safe And Efficient Intelligent Intersection Control Of Autonomous Vehicles, Qiang Lu
Safe And Efficient Intelligent Intersection Control Of Autonomous Vehicles, Qiang Lu
Electronic Theses and Dissertations
In this dissertation, we address a problem of safe and efficient intersection crossing traffic management of autonomous and connected ground traffic. Toward this objective, we propose several algorithms to handle different traffic environments. First, an algorithm that is called the Discrete-time occupancies trajectory (DTOT) based Intersection traffic Coordination Algorithm (DICA) is proposed. All vehicles in the system are Connected and Autonomous Vehicles (CAVs) and capable of wireless Vehicle-to-Intersection communication. The main advantage of DICA is that it enables us to utilize the intersection space more efficiently resulting in less delay for vehicles to cross the intersection. In the proposed framework, …
Quantitative Aspects Of Interface Remodeling During Germband Extension, Timothy E. Vanderleest
Quantitative Aspects Of Interface Remodeling During Germband Extension, Timothy E. Vanderleest
Electronic Theses and Dissertations
Oriented cell intercalation is an essential developmental process that shapes tissue morphologies through the directional insertion of cells between their neighbors. Intercalary behaviors in the early Drosophila embryo occur through a remodeling of cell topologies, with cells contracting shared AP interfaces to a single point, followed by newly juxtaposed DV cells constructing horizontally-oriented interfaces between them. Previous research has focused on properties of cell-cell interfaces, and led to a model in which actomyosin networks mediate higher line tensions at AP interfaces to direct contraction. However, the contribution of tricellular vertices to tissue elongation remains unclear. This study shows that cell …
Reconfigurable Reflectarray Antennas With Bandwidth Enhancement For High Gain, Beam-Steering Applications, Michael Trampler
Reconfigurable Reflectarray Antennas With Bandwidth Enhancement For High Gain, Beam-Steering Applications, Michael Trampler
Electronic Theses and Dissertations
Reconfigurable reflectarrays are a class of antennas that combine the advantages of traditional parabolic antennas and phased array antennas. Chapter 1 discusses the basic operational theory of reflectarrays and their design. A review of previous research and the current status is also presented. Furthermore the inherent advantages and disadvantages of the reflectarray topography are presented. In chapter 2, a BST-integrated reflectarray operating at Ka band is presented. Due to the monolithic integration of the tuning element, this design is then extended to V band where a novel interdigital gap configuration is utilized. Finally to overcome loss and phase limitations of …
Hybrid Multi-Objective Optimization Of Left Ventricular Assist Device Outflow Graft Anastomosis Orientation To Minimize Stroke Rate, Blake Lozinski
Hybrid Multi-Objective Optimization Of Left Ventricular Assist Device Outflow Graft Anastomosis Orientation To Minimize Stroke Rate, Blake Lozinski
Electronic Theses and Dissertations
A Left Ventricular Assist Device (LVAD) is a mechanical pump that is utilized as a bridge to transplantation for patients with a Heart Failure (HF) condition. More recently, LVADs have been also used as destination therapy and have provided an increase in the quality of life for patients with HF. However, despite improvements in VAD design and anticoagulation treatment, there remains a significant problem with VAD therapy, namely drive line infection and thromboembolic events leading to stroke. This thesis focuses on a surgical maneuver to address the second of these issues, guided by previous steady flow hemodynamic studies that have …
Theoretical And Experimental Study For Tailoring The Electromagnetic Properties Of Conductive Materials, Jeffrey Jennings
Theoretical And Experimental Study For Tailoring The Electromagnetic Properties Of Conductive Materials, Jeffrey Jennings
Electronic Theses and Dissertations
Induction in leaded, implanted medical devices exposed to radio frequency (RF) magnetic fields during magnetic resonance imaging (MRI) produce Joule heating in adjacent tissues causing various issues, including death. Given the importance of MRI as a diagnostic tool and the growth in leaded device-related treatments, identification of a solution ensuring their compatibility is of great interest. Electromagnetic (EM) surface property tailoring in lead materials to change their inductive response by adding functionally-graded, heterogeneous surface layers is a possible solution. However, non-uniform EM properties introduce two challenges: the added complexity of analyses and characterization of the graded region. This dissertation addresses …
Investigation Of Flow Field Structures In A Rectangular Channel With A Pin Fin Array, Patrick Tran
Investigation Of Flow Field Structures In A Rectangular Channel With A Pin Fin Array, Patrick Tran
Electronic Theses and Dissertations
Pin fin arrays are commonly found in heat exchangers, turbine blades, and electronic heat sinks. Fin arrays are extended surfaces that are used as turbulence promoters by inducing horseshoe vortex (HSV) and von Karman vortex (KV) structures. The horseshoe vortex are primarily studied in the leading edge of the blunt body, whereas the KV are formed in the trailing side. This study presents an experimental investigation of flow field structures and pressure loss on staggered pin fin array in the wake region, where KV are dominate. These flow structures increase the local levels turbulence and generate eddies that promote flow …
Safety, Operational, And Design Analyses Of Managed Toll And Connected Vehicles' Lanes, Moatz Saad
Safety, Operational, And Design Analyses Of Managed Toll And Connected Vehicles' Lanes, Moatz Saad
Electronic Theses and Dissertations
Managed lanes (MLs) have been implemented as a vital strategy for traffic management and traffic safety improvement. The majority of previous studies involving MLs have explored a limited scope of the impact of the MLs segments as a whole, without considering the safety and operational effects of the access design. Also, there are limited studies that investigated the effect of connected vehicles (CVs) on managed lanes. Hence, this study has two main objectives: (1) the first objective is achieved by determining the optimal managed lanes access design, including accessibility level and weaving distance for an at-grade access design. (2) the …
Design And Structural Analysis Of Morphing Wings, Nicholas Fernandez
Design And Structural Analysis Of Morphing Wings, Nicholas Fernandez
Electronic Theses and Dissertations
Many natural flyers and marine swimmers can morph their wings during a number of unsteady maneuverings. With such wing morphing they are able to control the unsteady aerodynamic forces. A number of man-made flyers, such as unmanned aerial vehicles and micro air vehicles, fly in comparable Reynolds number range, but they are yet to acquire similar morphing capabilities as natural flyers or swimmers. Moreover, the knowledge of fluid structural interaction (FSI) of such morphing wings is not well developed. Hence there is a need to investigate the FSI of morphing wings. In this thesis, a morphing wing was designed and …
Gan Power Devices: Discerning Application-Specific Challenges And Limitations In Hemts, Andrew Binder
Gan Power Devices: Discerning Application-Specific Challenges And Limitations In Hemts, Andrew Binder
Electronic Theses and Dissertations
GaN power devices are typically used in the 600 V market, for high efficiency, high power-density systems. For these devices, the lateral optimization of gate-to-drain, gate, and gate-to-source lengths, as well as gate field-plate length are critical for optimizing breakdown voltage and performance. This work presents a systematic study of lateral scaling optimization for high voltage devices to minimize figure of merit and maximize breakdown voltage. In addition, this optimization is extended for low voltage devices ( < 100 V), presenting results to optimize both lateral features and vertical features. For low voltage design, simulation work suggests that breakdown is more reliant on punch-through as the primary breakdown mechanism rather than on vertical leakage current as is the case with high-voltage devices. A fabrication process flow has been developed for fabricating Schottky-gate, and MIS-HEMT structures at UCF in the CREOL cleanroom. The fabricated devices were designed to validate the simulation work for low voltage GaN devices. The UCF fabrication process is done with a four layer mask, and consists of mesa isolation, ohmic recess etch, an optional gate insulator layer, ohmic metallization, and gate metallization. Following this work, the fabrication process was transferred to the National Nano Device Laboratories (NDL) in Hsinchu, Taiwan, to take advantage of the more advanced facilities there. Following fabrication, a study has been performed on defect induced performance degradation, leading to the observation of a new phenomenon: trap induced negative differential conductance (NDC). Typically NDC is caused by self-heating, however by implementing a substrate bias test in conjunction with pulsed I-V testing, the NDC seen in our fabricated devices has been confirmed to be from buffer traps that are a result of poor channel carrier confinement during the dc operating condition.
Training Neural Networks Through The Integration Of Evolution And Gradient Descent, Gregory Morse
Training Neural Networks Through The Integration Of Evolution And Gradient Descent, Gregory Morse
Electronic Theses and Dissertations
Neural networks have achieved widespread adoption due to both their applicability to a wide range of problems and their success relative to other machine learning algorithms. The training of neural networks is achieved through any of several paradigms, most prominently gradient-based approaches (including deep learning), but also through up-and-coming approaches like neuroevolution. However, while both of these neural network training paradigms have seen major improvements over the past decade, little work has been invested in developing algorithms that incorporate the advances from both deep learning and neuroevolution. This dissertation introduces two new algorithms that are steps towards the integration of …
Task Focused Robotic Imitation Learning, Pooya Abolghasemi
Task Focused Robotic Imitation Learning, Pooya Abolghasemi
Electronic Theses and Dissertations
For many years, successful applications of robotics were the domain of controlled environments, such as industrial assembly lines. Such environments are custom designed for the convenience of the robot and separated from human operators. In recent years, advances in artificial intelligence, in particular, deep learning and computer vision, allowed researchers to successfully demonstrate robots that operate in unstructured environments and directly interact with humans. One of the major applications of such robots is in assistive robotics. For instance, a wheelchair mounted robotic arm can help disabled users in the performance of activities of daily living (ADLs) such as feeding and …
Predictors Of Territorial Work Behavior: An Investigation Of Individual Differences In Personality Using The Hexaco Model, Andrew White
Predictors Of Territorial Work Behavior: An Investigation Of Individual Differences In Personality Using The Hexaco Model, Andrew White
Electronic Theses and Dissertations
To date, little research has examined the relationship between territorial work behavior and individual differences in personality. Using hierarchical multiple regression, dimension-level and facet-level personality traits of the HEXACO model of personality were examined to determine whether personality traits predict territorial work behaviors. Based on a sample of 160 workers from Amazon's Mechanical Turk, it was observed that the dimensions of Honesty-Humility, Emotionality, Openness to Experience, and Altruism predicted territorial work behaviors. In addition, facet-level traits from these dimensions, in addition to facets from the Extraversion and Agreeableness dimension, explained variance in each of the territorial behaviors. Furthermore, quantile regression …
Assessment Of A Surface Water Supply For Source And Treated Distribution System Quality, Angela Rodriguez
Assessment Of A Surface Water Supply For Source And Treated Distribution System Quality, Angela Rodriguez
Electronic Theses and Dissertations
This study focused on providing a source to tap assessment of surface water systems with respect to (i) the use of alternative biomonitoring tools, (ii) disinfection byproduct (DBP) formation and control, and (iii) corrosion control. In the first study component, two water systems were microbiologically evaluated using adenosine triphosphate (ATP) bioluminescence technology. It was determined that microbial ATP was useful as a surrogate for biomonitoring within a surface water system when paired with traditional methods. Although microbial activity differed between distribution systems that used either chloramine or chlorine disinfectant, in both cases flowrate and season affected microbial ATP values. In …