Modeling of thermal stresses during hardening the product surface by thermal pulse

A particular solution of a linear variant of the dynamic thermal elasticity problem is considered in application to modeling the conditions of surface hardening of metal products by an energy pulse. The authors determined the equation of medium motion with the model of temperature pulse tested earlier for compatibility with special cases of the equations of parabolic and hyperbolic thermal conductivity. The problem of loading a flat plane of a short circular cylinder (disk) with a temperature pulse is presented. Pulse is a consequence of adopted structure of the volumetric power density of the heat flux, the time multiplier of which has the form of a single wave of the Heaviside function. Classical thermoelastic displacement potential and the method of its division into the product of independent variables functions were used to construct the thermal stress tensor. Differential equations for multiplier functions and their general solutions were found. Natural boundary conditions were set for the components of thermal stress tensor, and their tasks were solved. The obtained solutions are in the form of segments of functional series (the Bessel function in radial coordinate and the exponential function in axial coordinate). The article considers a numerical example of loading a disk made of 40KhN steel which has the mechanical properties sensitive to temperature treatment. Maple computer mathematics package was used in the calculations. Approximate solutions take into account the first 24 terms of the functional series. Estimation of the example makes it possible to explain the presence of stress peaks and stress intensity as a consequence of mutually inverse processes of temperature stress growth and reduction of elasticity coefficients with temperature rise. The numerical example warns against relying only on estimates of solutions to thermoelasticity problems without taking into account the plastic and viscous properties of the material.

IoT-Based Smart Health Monitoring System for COVID-19 Patients

During the ongoing COVID-19 pandemic, Internet of Things- (IoT-) based health monitoring systems are potentially immensely beneficial for COVID-19 patients. This study presents an IoT-based system that is a real-time health monitoring system utilizing the measured values of body temperature, pulse rate, and oxygen saturation of the patients, which are the most important measurements required for critical care. This system has a liquid crystal display (LCD) that shows the measured temperature, pulse rate, and oxygen saturation level and can be easily synchronized with a mobile application for instant access. The proposed IoT-based method uses an Arduino Uno-based system, and it was tested and verified for five human test subjects. The results obtained from the system were promising: the data acquired from the system are stored very quickly. The results obtained from the system were found to be accurate when compared to other commercially available devices. IoT-based tools may potentially be valuable during the COVID-19 pandemic for saving people’s lives.

A Novel Method of Clinical Nursing under the Medical Internet of Things Technology

Internet of things technology began to spread to all industries of our lives; the application of medical internet of things in many hospitals highlighted its advantages and brought a lot of convenience to patients and medical staff. With the continuous progress of China’s medical reform and the continuous improvement of patients’ requirements for medical service quality, this paper discusses the application of medical internet of things in clinical nursing in ward, and the basic information collection, infusion, and mobile nursing were discussed and studied. Through the parallel control study of the laboratory itself, this paper evaluates whether the two different clinical measurement methods of medical internet of things technology and traditional technology are consistent in body temperature, pulse, respiration, and blood oxygen saturation. At the same time, it also deeply studies the value and advantages of internet of things technology in the application of other monitoring indicators in clinical nursing and analyses the problems in its application. The experimental data show that the two measurement methods with different principles can be completely replaced in clinical application, and the time efficiency of the new clinical nursing method under the medical internet of things technology in mapping body temperature, pulse, and respiration has been improved by 76.20% and 72.02%, respectively, surpassing the traditional information technology and realizing the intelligent, automatic, and standardized data acquisition method. It ensures the authenticity of data and the real-time of information flow and meets the needs of resource sharing and medical regional interconnection.

Numerical Analysis of Engine Exhaust Flow Parameters for Resolving Pre-Turbine Pulsating Flow Enthalpy and Exergy

Energy carried by engine exhaust pulses is critical to the performance of a turbine or any other exhaust energy recovery system. Enthalpy and exergy are commonly used concepts to describe the energy transport by the flow based on the first and second laws of thermodynamics. However, in order to investigate the crank-angle-resolved exhaust flow enthalpy and exergy, the significance of the flow parameters (pressure, velocity, and temperature) and their demand for high resolution need to be ascertained. In this study, local and global sensitivity analyses were performed on a one-dimensional (1D) heavy-duty diesel engine model to quantify the significance of each flow parameter in the determination of exhaust enthalpy and exergy. The effects of parameter sweeps were analyzed by local sensitivity, and Sobol indices from the global sensitivity showed the correlations between each flow parameter and the computed enthalpy and exergy. The analysis indicated that when considering the specific enthalpy and exergy, flow temperature is the dominant parameter and requires high resolution of the temperature pulse. It was found that a 5% sweep over the temperature pulse leads to maximum deviations of 31% and 27% when resolving the crank angle-based specific enthalpy and specific exergy, respectively. However, when considering the total enthalpy and exergy rates, flow velocity is the most significant parameter, requiring high resolution with a maximum deviation of 23% for the enthalpy rate and 12% for the exergy rate over a 5% sweep of the flow velocity pulse. This study will help to quantify and prioritize fast measurements of pulsating flow parameters in the context of turbocharger turbine inlet flow enthalpy and exergy analysis.

Abstract P269: Influence Of Sex, Race, And Changes In Vital Signs In Covid-19 And Flu Diagnosed Patients In Mississippi

Early detection of viral infections, such as COVID-19 and flu, have the potential to reduce risk of morbidity, mortality, and disease transmission through earlier intervention strategies. Distinguishing patterns among vital signs, including body temperature, pulse rate, respiration rate, and blood pressure, can help to diagnose a potential respiratory virus more rapidly and accurately. The objective of this study was to utilize the University of Mississippi Medical’s extensive clinical database (EPIC) to investigate the potential association between temperature, pulse rate, blood pressure, and respiration with influenza and COVID-19. COVID-19 (March 3, 2020 to February 27, 2021) and flu (October 1, 2017 to September 30, 2018) diagnosed patients were identified from over 1 million patients (of a total population of 3 million) and 36 million encounters of Mississippi residents from the electronic health record. Data from patients with reported demographic dimensions (age, first race, and sex) and office visit dimensions (BMI, diastolic blood pressure (BP), pulse rate, respiration rate, systolic BP, and temperature) was obtained for 1,363 COVID-19 and 507 flu diagnosed patients, including day of diagnosis and additional encounter visits within 60 days before and after first unique viral disease diagnosis. Patients with COVID-19 or flu were disproportionately obese, with 93% of COVID-19 and 79% of flu patients with BMI ≥30. Most striking was that black women in 50-64 years disproportionately carried the burden of disease. For all patients at the time of infection, temperature was significantly increased for both respiratory viruses, pulse rate was significantly increased for flu, and BP was not significantly increased in either infection. We compared flu patients with no pre-existing diagnoses (n= 57) to those with essential (primary) hypertension (n= 234) and found significantly higher systolic BP at day of infection in flu only patients. Our findings show the need for more complete demographic and office visit dimension data from patients during epidemic and pandemic events.

Clinical condition and productivity of gonadoectomized roosters of Adler silver breed

The effect of gonadoectomy (removal of the testicles) in Adler's silver roosters on the clinical condition, live weight, slaughter rates and chemical composition of the pectoral muscle was studied. The experiment was performed on 40 roosters of 6-weeks, which according to the principle of analogues were divided into two groups: control and experimental 20 heads each. It was found that in the preparatory period, which lasted 10 days indicators of the clinical condition – body temperature, pulse and respiration, as well as live weight of the roosters of the experimental group did not differ from the control. Gonadoectomy of roosters of the experimental group, conducted at the age of 45 days by a specially developed method, increased the body temperature of the poultry on the second day after surgical intervention by 1.03°C, and on the third – by 1.15°, while other indicators of clinical condition – pulse, number respiratory movements and live weight did not change compared to control. The duration of the postoperative period in the roosters of the experimental group was 3-4 days and ended with the healing of the wound on the skin. Subsequently, body temperature, pulse and the number of respiratory movements in gonadoectomized roosters corresponded to similar indicators of poultry in the control group. The live weight of gonadoectomized roosters in the rearing process, which was monitored decadelly from the 65th to the 95th day compared to the control did not change, on 105th and 115th day had a tendency to increase, and 125th day increased by 4.8 %. Slaughter rates of gonadoectomized roosters corresponded to similar indicators of poultry of the control group. The weight of the gutted carcass was higher by 5.2% and that of the muscular stomach by 7.8%. Differences in the chemical composition of the pectoral muscle of gonadoectomized roosters compared with control, namely: on the content of dry matter, moisture, fat, protein and ash were not found. Thus, gonadoectomy of roosters of the Adler's silver meat-egg breed does not affect their clinical condition, the chemical composition of the pectoral muscles, but increases the live weight of the bird on the 125th day of rearing

Some Observations on the Temperature, Pulse, and Respiration during Labour and the Lying—in

The named authors investigated the influence of labor and puerperal period on temperature, pulse and respiration.