Analýza optimalizace parametrů vektorového řízení třífázového indukčního motoru pomocí evolučního algoritmu

In this paper, the impact of regulators set and their types for the characteristic of rotational speed of induction motor was researched.. The evolutionary algorithm was used as optimization tool. Results were verified with using MATLAB/Simulink.V tomto příspěvku je popsán výzkum dopadu sady regulátorů a jejich typů na úhlovou rychlost indukčního motoru. Jako optimalizační nástroj byl použit evoluční algoritmus Výsledky byly ověřeny pomocí simulačního software MATLAB/Simulink

Space Human Factors Engineering Gap Analysis Project Final Report

Humans perform critical functions throughout each phase of every space mission, beginning with the mission concept and continuing to post-mission analysis (Life Sciences Division, 1996). Space missions present humans with many challenges - the microgravity environment, relative isolation, and inherent dangers of the mission all present unique issues. As mission duration and distance from Earth increases, in-flight crew autonomy will increase along with increased complexity. As efforts for exploring the moon and Mars advance, there is a need for space human factors research and technology development to play a significant role in both on-orbit human-system interaction, as well as the development of mission requirements and needs before and after the mission. As part of the Space Human Factors Engineering (SHFE) Project within the Human Research Program (HRP), a six-month Gap Analysis Project (GAP) was funded to identify any human factors research gaps or knowledge needs. The overall aim of the project was to review the current state of human factors topic areas and requirements to determine what data, processes, or tools are needed to aid in the planning and development of future exploration missions, and also to prioritize proposals for future research and technology development

Diversity and altitudinal niche width characteristics for 35 taxa of the Papua New Guinea Frullania flora with consideration of sibling pairs

The Frullania taxa on Mount Albert Edward, Papua New Guinea, form many associations that suggest a high degree of niche similarity, but at different altitudes, different associations form. The species diversity of the genus is greatest at the middle altitudes and least in the dry lowlands. This altitudinal separation is apparent in the niche widths of the taxa. The members of the four sibling taxa pairs examined exhibit distinct altitudinal niches, suggesting that the sibling taxa are distinct, with different niche optima

Metoda optimální syntézy adaptivního pid regulátoru uzavřeného regulovaného systému s využitím evolučního algoritmu

This work suggests a method of searching optimal adaptive of controller PID in closed system using evolutionary algorithm. The object with well-known characteristics is controlled by a signal from the controller. Its’ assumed answer step change of system will be well-known desirable time function of the basis we can characterize, regulate, answer of system depending on controller’s PID parameters, and it calculates adaptive of this controller. Adaptive makes possible to obtain characteristics, which will be similar to assumed characteristics presented by time function. The answer of researched controller’s system will be characterized by the best desirable quality index.V příspěvku je navržena metoda optimální syntézy adaptivního PID regulátoru uzavřeného regulovaného systému s využitím evolučních algoritmů. Objekt s dobře známou charakteristikou je řízen prostřednictvím akční veličiny z regulátoru. Adaptivní regulace umožňuje získat charakteristiky, které jsou velmi podobné předpokládaným časovým průběhům. Zkoumaný regulátor je charakterizován požadovaným indexem kvality

Human Factors and ISS Medical Systems: Highlights of Procedures and Equipment Findings

As part of the Space Human Factors Engineering Critical Questions Roadmap, a three year Technology Development Project (TDP) was funded by NASA Headquarters to examine emergency medical procedures on ISS. The overall aim of the emergency medical procedures project was to determine the human factors issues in the procedures, training, communications and equipment, and to recommend solutions that will improve the survival rate of crewmembers in the event of a medical emergency. Currently, each ISS crew remains on orbit for six month intervals. As there is not standing requirement for a physician crewmember, during such time, the maintenance of crew health is dependant on individual crewmembers. Further, in the event of an emergency, crew will need to provide prolonged maintenance care, as well as emergency treatment, to an injured crewmember while awaiting transport to Earth. In addition to the isolation of the crew, medical procedures must be carried out within the further limitations imposed by the physical environment of the space station. For example, in order to administer care on ISS without the benefit of gravity, the Crew Medical Officers (CMOs) must restrain the equipment required to perform the task, restrain the injured crewmember, and finally, restrain themselves. Both the physical environment and the physical space available further limit the technology that can be used onboard. Equipment must be compact, yet able to withstand high levels of radiation and function without gravity. The focus here is to highlight the human factors impacts from our three year project involving the procedures and equipment areas that have been investigated and provided valuable to ISS and provide groundwork for human factors requirements for medical applications for exploration missions

Synthesis, Characterization, and Simulation of Two-Dimensional Materials

ABSTRACT SYNTHESIS, CHARACTERIZATION, AND SIMULATION OF TWO-DIMENSIONAL MATERIALS by Lawrence Hudy The University of Wisconsin-Milwaukee, 2023Under the Supervision of Professor Michael Weinert This dissertation focuses on my journey through many aspects of surface science leading to the first principles investigation of transition metal dichalcogenides studying the impact of defects, twist, and decreasing interlayer separation to probe their effect on the electronic properties of these materials. My journey started out learning many aspects of material science such as methods for material synthesis and characterization but later ended on simulation of material properties using density functional theory. In the first experiments, we focus on two-dimensional material synthesis, mostly involving graphene, where we see that polymer transferred graphene forms a Schottky junction when interfaced with a semiconductor. From atomic force microscopy and scanning tunneling microscopy we see that polymer transferred graphene is not entirely flat and forms ripples and ridges on the surface. Scanning tunneling spectroscopy and temperature dependent current-voltage measurements help to show that the behavior of these graphene Schottky diodes are not ideal. The observed temperature dependent Schottky barrier height can be explained using a distribution of barriers with varying barrier heights. The theoretical studies focus on various transition metal dichalcogenides, composed of MoSe2 and WSe2, using their monolayer and their homo and hetero bilayer counterparts. The first studies observed that adding defects alters the electronic band structure, and in particular, a copper dopant creates impurity states at the Fermi level and induces a significant magnetic moment in the material. The resulting occupied unpaired spin states are the key contributor to the creation of the magnetic moment in this material. Next, we see that twisted bilayer transition metal dichalcogenides, specifically bilayers composed of MoSe2 and WSe2, where we observe pressure induced flat bands and real space localization. Using a commensurate set of twist angles and varying interlayer spacing led to the discovery of flat bands and real space localization. These flat bands are a result of forcing the bilayers to interact causing a localization in real space. It is only under special conditions where the closest chalcogens, along with the nearest metal atoms, form a hybridized state that contribute to the flat bands in the energy band diagram. These findings help to highlight the impact impurities can have on transition metal dichalcogenides and the role of twist and interlayer separation has on the formation of flat bands as well as real space localization in these materials

Mechanisms of Injury and Countermeasures for EVA Associated Upper Extremity Medical Issues: Extended Vent Tube Study

The goal of this study is to determine the role that moisture plays in the injury to the fingers and fingernails during EVA training operations in the Neutral Buoyancy Laboratory. Current Extravehicular Mobility Unit (EMU, with a PLSS) as configured in the NBL was used for all testing and a vent tube was extended down a single arm of the crewmember during the test; vent tube was moved between left and right arm to serve as experimental condition being investigated and the other arm served as control condition

The Implementation of Harm Reduction Strategies in Eating Disorder Treatment: A Systematic Literature Review

Eating disorders have one of the highest mortality rates of all mental illnesses (NEDA, 2021). The rate of relapse among patients who receive traditional eating disorder treatment is significant (Berends et al., 2016). The treatment landscape for eating disorders has historically been rooted in abstinence based models. According to Williams et al. (2010) this often overlooks and minimizes the complexity of individual experiences and continues to perpetuate stigma. Despite significant advancements in research and clinical interventions, current models frequently fall short in addressing the multifaceted nature of these complex disorders. However, evidenced based research and clinical practice shows the potential efficacy and ethical imperative of integrating harm reduction principles into treatment approaches (Janse van Rensburg, 2020). This paper critically examines the shortcomings of traditional treatment approaches, highlights their limitations in fostering sustainable recovery and mitigating harm. Through a comprehensive review of current literature, the prevailing emphasis on abstinence-based frameworks and its implications for patients\u27 autonomy, stigma, and long-term outcomes are explored. A study done by Andersen et al. (2021) revealed that there are five main themes as to why people do not access traditional eating disorder treatment: (1) Disagreement on treatment needs, (2) rigid standard procedures, (3) failure to listen, (4) deprivation of identity, and (5) mistrust and fear. Moreover, the inherent flaws in the dichotomous view of success and failure within the context of eating disorder treatment, as researched by Leavy et al. (2011) underscores the importance of embracing a more nuanced understanding of progress. The conceptual framework of harm reduction within the context of eating disorders, emphasizes its compatibility with a patient-centered, holistic approach to care (Westmoreland & Mehler, 2016). Furthermore, there are potential benefits of harm reduction strategies which include promoting engagement, reducing shame, and enhancing long-term outcomes (Khan et al., 2022) . Through an analysis of current practices and emerging evidence, this paper advocates for a paradigm shift towards a harm reduction-oriented model of care in the treatment of eating disorders, ultimately prioritizing the well-being and autonomy of each individual on their recovery journey. The results of this systematic literature review demonstrates that there is a paucity of evidence related to the application of harm reduction interventions when they are applied to the treatment of eating disorders. Further research studies are needed on this subject in order to assess outcomes

Improvement of Depressive-like Behaviors in Hemi-parkinsonian Rats with Non-invasive Peripheral Focused Ultrasound Modulation

Parkinson’s disease (PD) is a chronic and progressive neurodegenerative disease with marked loss of dopaminergic neurons in the substantia nigra pars compacta (SNc). In PD, there are motor and non-motor symptoms. Depression, a non-motor symptom, is seen in 40% of the patients with PD which decreases their quality of life. For treatment-resistant depression, vagus nerve stimulation (VNS) has been shown to improve depression. Here, non-invasive focused ultrasound (FUS) is investigated as a therapeutic to improve depression-like behavior by targeting the celiac plexus since it is innervated by the vagus nerve. FUS was chosen due to its parallel mechanism to VNS. Male Sprague Dawley rats were used and made hemi-Parkinsonian (“PD”) with craniotomy surgery which delivered unilateral six-hydroxydopamine (6-OHDA) in the brain to lesion dopaminergic neurons in the right medial forebrain bundle (MFB). Sham (n=23) and Hemi-Parkinsonian (n=40) were evaluated using LATs to determine their forepaw movement. They underwent a sucrose preference test (SPT) to assess the rats’ level of anhedonia, or their inability to experience pleasure, which is one behavioral test that evaluates depression-like behavior in rats. FUS was delivered to the rats 21 days post-lesion for five consecutive days. Post-mortem analysis was performed using TH analysis. It was shown that hemi-Parkinsonian rats displayed akinesia in their left forepaw and a \u3e90% reduction in dopaminergic neurons on the lesion side. It was found that hemi-Parkinsonian rats exhibited anhedonia which was improved with FUS treatment. The TH analysis displayed no statistical difference between the different treatment groups. In all, FUS improved anhedonia in hemi-Parkinsonian and sham rats which may be a credible therapeutic for future patients. While further research must be done, FUS may be viable therapeutics for patients with PD experiencing depression