Work Efficiency Research Articles

Nonlinear dynamic characteristics of mechatronics integrated planetary gears considering wear and temperature effects

The electromechanical planetary gear system has high work efficiency and long service life, but factors such as heat, wear, and electrical signals can affect the transmission performance of electromechanical planetary gears. This article comprehensively considers factors such as temperature, tooth surface wear, lubrication, current and voltage, damping ratio, etc. Based on the principle of thermal deformation, Archard wear model, and equivalent circuit principle, a dynamic model of electromechanical planetary gears is established. The existing literature has not comprehensively analyzed the effects of temperature, wear, and electrical signal changes on the nonlinear characteristics of electromechanical planetary gear systems. The results show that when the motor current is between 7 A and 18 A and the voltage is lower than the rated voltage, the system is in a stable state; as the temperature rises, the system tends to stabilize; the gear wear exceeds 30 μm, and the bifurcation characteristics of the system are more pronounced.

A novel method for the evaluation of right ventricular dysfunction in acute pulmonary embolism: Myocardial work indices.

The presence of right ventricular dysfunction indicates a higher risk status in patients with pulmonary embolism (PE). The RV strain evaluated by speckle-tracking echocardiography seems to be more reliable method in the evaluation of RV dysfunction as compared to standard echocardiographic measures. In this study, we aimed to determine the value of myocardial-work indices in evaluating serial changes of RV function in acute PE. Our study comprised 83 consecutive acute PE patients who admitted to our tertiary cardiovascular hospital. Echocardiography was performed within the first 24-hours of hospitalization, and RV and LV myocardial-work parameters were obtained along with standard echocardiographic parameters. The change in the RV/LVr detected on tomography was selected as the primary outcome measure, and its' predictors were analyzed with classical linear regression and a generalized additive model (GAM). Among the LV-RV strain and myocardial work parameters, the RV global longitudinal strain (GLS) has borderline statistical significance in predicting the RV/LVr change whereas the RV global work efficiency (RV-GWE) strongly predicted RV/LVr change (p: 0.049 and <0.001, respectively). In this study, classical linear regression and GAM analyses showed that RV-GWE seems to offer a better prediction of RV/LVr change in patients with acute PE.

Amino‐modified banana nanocellulose aerogels with quick pH‐responsive switchable wettability for oil–water separation

AbstractWith the rapid development of the maritime industry, oily wastewater discharges and oil spills cause acute environmental challenges. Currently, cellulosic materials with switchable wettability have received increasing interest for oil–water separation. Moreover, work efficiency needs to be improved with a shorter response time. To realize these, dimethylaminoethyl methacrylate (DMAEMA) and methyltrimethoxysilane (MTMS) synthesized pH‐responsive copolymer (DMAEMA‐co‐MTMS) which grafted banana nanocellulose fiber made from wasted pseudostem to achieve the pH‐responsive aerogel (BCNA‐DcoM). BCNA‐DcoM exhibited hydrophilic/submerged lipophobicity under acidic conditions and hydrophobic/lipophilic under alkaline conditions. A response time of 3 s and a contact angle of 135° were shown when the mass ratio of banana nanocellulose suspension, MTMS, and DMAEMA‐co‐MTMS was 5:3:9. Moreover, BCNA‐DcoM possessed favorable mechanical friction properties, salt resistance (25% NaCl), compression resilience (50 cycles of compression at 60% strain), switchable wettability (&gt;30 cycles), and highly efficient separation performance (&gt;96%). The adsorption capacity of BCNA‐DcoM for oil is 80–184 times the initial weight of the aerogel based on the different oil densities. For practical applications, BCNA‐DcoM could continuously separate oil–water mixtures with the constant‐flow pump. The present work provides more possibilities for rapidly treating industrial oily wastewater with low‐cost and ecological banana pseudostem materials.

Study on droplet deposition characteristics and application of small and medium crown garden plants sprayed by UAV sprayer

The Unmanned Aerial Vehicle (UAV) sprayer has the advantages of high work efficiency, simple operation, and high safety factor, and has broad application prospects UAV sprayer are widely used in the agricultural field, and the application of UAV sprayer spraying technology in agriculture has provided convenience and increased profits for farmers, and has also become a research hotspot in the field of agriculture. In recent years, although research has been conducted on the feasibility and application effects of UAV sprayer spraying crown shaped plants, there have been no experiments or studies in the field of garden plants. This experiment conducted a droplet deposition experiment of UAV sprayer spraying garden plants, exploring the droplet deposition effect of UAV sprayer in the field of garden plants, and conducting experiments on the influence of spray volume and nozzle type on droplet deposition. The experimental results showed that the canopy performance of small and medium-sized garden plants was better at a flight altitude of 1.5m, a spray volume of 180L/hm2, and a flight speed of 2m/s. Reducing flight altitude, increasing spray volume, and reducing flight speed can improve the distribution of droplets in the canopy. This experiment lays the foundation for the application of UAV sprayer for the prevention and control of pests and diseases in garden plants, as well as for the application of growth regulators, and provides a basis for further innovative research in the field of garden plant application technology.

THE EFFICACY OF VERY LOW CALORIE KETOGENIC DIET (VLCKD) ON CARDIO–METABOLIC PROFILE IN PATIENTS WITH OBESITY

Abstract Background Obesity is associated with alterations in cardiac structure and haemodynamics leading to cardiovascular mortality and morbidity. Very low calorie ketogenic diet (VLCKD) has been proposed as an effective intervention to achieve a significant weight loss in obese patients in a short time period. Furthermore, hyperketonemia induced by VLCKD is associated with beneficial cardiovascular effects. In addition, ketogenic diet is able to prevent mitochondrial fission, improve mitochondrial function, suppress oxidative stress and attenuate cardiac myocytes apoptosis in the heart of mice. Aim To evaluate the role of VLCKD on cardio–metabolic risk factors, cardiac dysfunction and myocardial remodelling in obese patients. Materials and Methods Ten obese patients treated with VLCKD were enrolled. All patients were characterized from an anthropometric, cardio–metabolic and echocardiographic point of view at baseline and 8 weeks after VLCKD treatment. In addition, each patient underwent measurement of global myocardial work efficiency (GWE), a novel indicator that accounts for deformation and afterload, which may provide additional value for assessment of myocardial function. The insulin resistance (IR) was evaluated by HOMA–IR. Results As expected, all the patients showed a significant reduction in body weight and an overall improvement of body composition parameters after VLCKD. Weight (kg) (from 105.1 ± 18.2 to 83.7 ± 16.7, P &amp;lt;0.05), BMI (kg/m2) (from 40.1 ± 4.7 to 31.8 ± 4.8, P= 0.002) and waist circumference (cm) (from 115 ± 13.6 to 101.8 ± 12.4, p &amp;lt; 0.05) were significantly lower after VLCKD treatment. VLCKD treatment improved also significantly fasting glucose levels (P &amp;lt;0.05), fasting insulin levels (P =0.004), HOMA–IR values (P &amp;lt;0.001), lipid profile and systolic and diastolic blood pressure levels. In addition, the echocardiogram evaluation showed an improved in end–diastolic left ventricular volume, end–systolic left ventricular volume, left ventricular mass and left ventricular mass index. Interestingly, a significantly changes in GWE was observed (P&amp;lt;0.05). Conclusion Although preliminary, our data suggest that VLCKD treatment is able to reduce cardio–metabolic risk factors and to improve cardiac dysfunction and myocardial function.

EFFECTS OF VERY LOW CALORIE KETOGENIC DIET VS SLEEVE GASTRECTOMY ON CARDIO–METABOLIC PROFILE IN PATIENTS WITH OBESITY

Abstract Background Obesity is a complex, multifactorial disease with deleterious effects on cardiac function. Currently, the obesity treatment is one of the most difficult challenges. Very low calorie ketogenic diet (VLCKD) has been proposed as an effective intervention for obesity. Furthermore, hyperketonemia induced by VLCKD is associated with beneficial cardiovascular effects. On the other hand, sleeve gastrectomy (SG) has been proven to be the most effective long–term weight management treatment. However, to date, it is still unclear whether the positive effects of SG on cardiovascular disease are mediated only by weight loss. Aim To evaluate the changes in anthropometric and metabolic parameters and in cardiac structure and function after treatment with SG or VLCKD. The results obtained in the two groups have been compared to verify if, in the short time, there were differences between these two treatments. Methods Twenty obese patients were enrolled. All the patients underwent a complete anthropometrical evaluation, laboratory determinations and echocardiogram evaluation. Ten patients have been treated with SG and 10 with VLCKD. The two group were comparable for weight loss: –26 kg (28%) after 3 months in patients treated with VLCKD and –25 kg (27.5%) after 6 months in patients treated with SG. Results An improvement in the anthropometric and metabolic profile was observed in all the patients. There were significant improvements in cardiovascular risk factors, including total cholesterol levels, triglyceridis, fasting glycemia, systolic and diastolic blood pressure, serum uric acid and HOMA–IR values. Similarly, the echocardiogram evaluation showed, in both groups of treatment, a reduction of the end–diastolic left ventricular volume, a reduction of the end–systolic left ventricular volume and a reduction of interventricular septal thickness and posterior wall thickness. Furthermore, an increase in the Ejection Fraction has been observed. No significantly differences between two groups were observed. Interestingly, in patients in treatment with VLCKD, a significant change in the global myocardial work efficiency (GWE) was observed. Conclusion Our data showed that VLCKD and SG have the potential to protect cardiometabolic health and myocardial remodeling in obese patients. VLCKD is a promising lifestyle intervention that can be used to prevent or treat cardiovascular disease. However, its effectiveness in the medium to long term must be evaluated.

ROLE OF RIGHT VENTRICULAR MYOCARDIAL WORK IN THE STRATIFICATION OF PATIENTS AFFECTED BY ADVANCED HEART FAILURE

Abstract Background Currently adopted echocardiographic parameters for the evaluation of right ventricle (RV) are all loading sensitive and their reliability remains poor. RV myocardial work (RVMW) emerged as an innovative non–invasive diagnostic tool that incorporates strain pressure loops and potentially overcomes the aforementioned limitation. No previous studies assessed the variations of RVMW depending on the hemodynamic setting. Aim of the study: To evaluate the different values of RVMW in patients affected by advanced heart failure (AHF) with and without pulmonary hypertension (PH) at right heart catheterization (RHC) and their variations in patients with baseline PH who subsequently achieved PH reversibility. Methods and Results All patients with AHF who underwent RHC and echocardiography within 24h at Istituto Mediterraneo per I Trapianti e Terapie ad Alta Specializzazione (ISMETT) since 01/05/2023 were prospectively enrolled. Patients with baseline documented PH who achieved PH reversibility at RHC underwent a second echcocardiographic assessment under the same hemodynamic conditions. The following components of RVMW were analysed: 1) RV global work index (RVGWI); 2) RV global constructive work (RVGCW); 3) RV global wasted work (RVGWW); 4) RV global work efficiency (RVGWE). Overall, 41 patients were enrolled (16 without PH and 25 with PH). Patients with PH had a higher RVGWI (341±133mmHg% vs 207±104mHg%; p=0.002) and RVGCW (450±153mmHg% vs 294±114mmHg%; p=0.001) compared to those without, while RVGWE did not differ in the two groups (80 ±10mmHg% vs 80 ±15mmHg%; p=0.92). A trend toward a higher RVGWW in patients with PH was observed (89±54mmHg% vs 59 ±66mmHg%; p=0.12). Among the 25 patients with PH, 10 were tested for PH reversibility and this was achieved in 9/10 (90%). RVGWI and RVGCW significantly dropped once PH reversibility was achieved (respectively from 393 ±185mmHg% to 241±67mmHg; p=0.008 and from 435±127mmHg% to 268±67mmHg%; p=0.048). Interestingly, RVGWE remained almost unchanged (from 81±11mmHg% to 79±9mmHg%; p=0.661) while there was a nearly significant trend in RWGWW decrease (from 65±20mmHg% to 41 ±22mmg%; p=0.076). Conclusions Patients affected by AHF and PH have significantly higher RVGWI and RWGCW compared to those without. However, RVGWE is similar between the groups and does not vary depending the hemodynamic setting, potentially identifying this parameter as the most reliable one in patients with AHF.

Exploring the Key Factors Influencing College Students’ Willingness to Use AI Coding Assistant Tools: An Expanded Technology Acceptance Model

The application of artificial intelligence (AI) in programming assistance has garnered researchers’ attention for its potential to reduce learning costs for users, increase work efficiency, and decrease repetitive coding tasks. However, given the novelty of AI Coding Assistant Tools (AICATs), user acceptance is currently limited, and the factors influencing this phenomenon are unclear. This study proposes an expanded model based on the Technology Acceptance Model (TAM) that incorporates the characteristics of AICAT users to explore the key factors affecting college students’ willingness to use AICATs. Utilizing a survey methodology, 303 Chinese participants completed the questionnaire. Factor analysis and Structural Equation Modeling (SEM) results indicate that users’ dependence worry (DW) about AICATs positively affects perceived risk (PR), which in turn negatively impacts perceived usefulness (PU) and perceived ease of use (PEOU), thus reducing user willingness to use. Dependence concerns also negatively impact perceived trust (PT), while PT positively affects PU and PEOU, thereby enhancing willingness to use. Additionally, a user’s self-efficacy (SE) negatively impacts DW and positively affects PEOU. This study discusses the potential significance of these findings and offers suggestions for AICAT developers to foster and promote widespread use.

SOFTWARE OPTIMIZATION OF RESOURCE ALLOCATION PROCESS IN METRO CONSTRUCTION ORGANIZATIONS: ANALYSIS OF EFFICIENCY OF EXISTING METHODS

This article explores the objectives of optimal resource allocation in metro construction organizations, including improving work efficiency, reducing project duration, and minimizing costs. The primary optimization methods, such as mathematical modeling, critical path analysis, and the use of network graphs, are discussed in the context of achieving these goals. The role of project management software in providing comprehensive control over planning, resources, and execution is emphasized. Additionally, the article underscores the significance of utilizing the Python programming language and its libraries, such as Pandas, Scikit-learn, and Matplotlib, in analyzing and optimizing resource allocation in metro construction. The paper contains a case study of a software implementation of risk analysis of delivery delays in metro construction using the Python programming language and its key libraries. Pandas for data processing and analysis, NumPy for performing complex mathematical calculations, and Matplotlib for visualizing the results were used.

The Research of Collaborative System of Remote Sensing Monitoring Based on Bimodal Cloud

Abstract. Cloud service is based on cloud computing, Offering a On-Demand service to every terminal equipment of computing resource pool. This paper designed and developed a coordinated operating system based on bimodal cloud. This system is taken mutual scheduling mechanism into account, which is capable of storing massive amounts of heterogeneous remote sensing data and provides fast indexing of data based on various characteristics, integrated Satellite transit forecast, DOM Produce, coordinated change information extraction and results sharing based on Nginx load balancing, in addition, the system designed two layer security system to ensure the safety of data results.The "YunYao" geographic information service rendering engine built on the dual-state cloud platform significantly outperforms mainstream platforms in the same testing environment. Its rendering speed surpasses ArcGIS Desktop by more than two times, exceeds GeoServer by more than four times, and is over seven times faster than ArcGIS Server. Remote sensing practitioners can quickly and conveniently utilize this system, while providing convenient functionalities that enable remote sensing scientists to independently conduct scientific research and development using this system. Experimentation and practice shows that this system simplified routine work flow, improved work efficiency, has a important reference meaning to remote sensing monitoring.

An examination of the usefulness of a quantitative appraisal method in nursing human resource management in primary hospital operating rooms: An example of integrated collaborative scheduling.

In recent years, China medical and health services have made great development. However, the management of nursing human resources in operating room of primary hospitals still faces a series of challenges. In the nursing work of operating room, high-quality nursing human resource management is important for improving the efficiency of operating room and ensuring the safety of patients. From January 2022 to December 2022, comprehensive collaborative scheduling and quantitative scoring evaluation methods were carried out in our hospital, and relevant data were collected. The flexible scheduling combined quantitative scoring performance appraisal system and the traditional scheduling plus average distribution performance appraisal system were statistically analyzed and compared in terms of annual surgical cases, annual overtime hours, annual back work hours, annual compensatory rest hours, and average daily working hours. This study was based on 30 medical staff (27 females and 3 males) in the operating room of a primary hospital. The annual operation volume increased by 387 cases compared with before, and the attitudes of patients to the service attitude and preoperative waiting time were significantly improved, reaching more than 95%. In addition, in the survey of surgeons, it was found that their satisfaction with preoperative preparation and operation time was significantly higher than that of the traditional scheduling method, and reached more than 95%. In the survey of nursing staff, it was found that the satisfaction with the traditional scheduling method was about 80%, and the satisfaction directly reached 100% after the comprehensive collaborative scheduling system. Based on the above survey, the satisfaction of nurses, doctors and patients with the new comprehensive collaborative scheduling system has improved compared with before. After the implementation of the comprehensive collaborative scheduling system, the annual surgical volume has increased significantly, and the average daily working hours of nursing staff have decreased. Comprehensive collaborative scheduling is an effective method of nursing human resource management in operating room, which can effectively improve the work efficiency of nurses and the satisfaction of patients, doctors and nurses. In practice, this method needs to be continuously explored and refined to adapt to different application scenarios and requirements.

RESEARCH OF THE TECHNOLOGICAL FEATURES OF THE PAVING TILES MANUFACTURE FOR THE IMPROVEMENT OF INDUSTRIAL AND CIVIL FACILITIES

Purpose. The purpose of the scientific article is to substantiate the parameters of the production of high-quality paving slabs and to determine the basic principles of paving technology of road surfaces using paving slabs. The work is based on the experience gained in the field of paving stone production, specifies the basic principles of its production, as well as methods that allow to increase its strength and resistance to the effects of weather conditions, mechanical influences and loads. Methodology. The research was carried out in accordance with the current regulatory documents that regulate the research of construction composites, raw materials for their manufacture and finished products, which were considered in the submitted work. A number of experimental studies of fine-grained concrete have been conducted from the point of view of their physical and mechanical properties and the parameters of the construction of road surfaces from manufactured elements. Findings. When installing paving slabs, it is necessary to take into account not only the quality of the products themselves, but also observe the technology of laying the soil base for paving. It was established that not only the main composition of fine-grained concrete is important. It is determined from which raw materials and under which manufacturing conditions it is possible to obtain high-quality, durable products. An analysis of the compositions that are most widely used in the conditions of modern production of paving stones is given. The most rational dosage of each component, which affects the properties of the working mixture and the finished construction coating, is also given. Originality. The relationship between the combination of components of fine-grained concrete, which allows obtaining high-quality small-sized products for the installation of a road surface, has been established. The list of the most common paving defects that occur during the manufacturing process has been defined and the technological requirements for the preparation of the soil base for the road surface have been established. Practical value. The obtained research results allow to product high-quality paving slabs, which have the necessary indicators for the installation of a durable road surface. The conditions for the preparation of the ground base for the paving of road surfaces are determined and the importance of their observance is substantiated. This will increase the efficiency of work and ensure the comfort of the population.

Workplace violence, work-related exhaustion, and workplace cognitive failure among nurses: A cross-sectional study.

To examine the relationships between nurses' exposure to workplace violence and self-reports of workplace cognitive failure. A cross-sectional study. An online questionnaire was administered in April 2023 to nurses in Michigan, US. Structural equation modelling was used to examine effects of physical and non-physical workplace violence (occupational stressors) and work efficiency and competence development (occupational protective factors) on workplace cognitive failure. Physical violence was a significant predictor of the action subscale of cognitive failure. There were no direct effects of non-physical violence, workplace efficiency, or competence development on any of the workplace cognitive failure dimensions. Both types of violence and efficiency had significant indirect effects on workplace cognitive failure via work-related exhaustion. Work-related exhaustion predicted significantly higher scores for workplace cognitive failure. Workplace violence and work efficiency exhibited primarily indirect effects on workplace cognitive failure among nurses via work-related exhaustion. Nurses experiencing workplace violence may be at increased risk for workplace cognitive failure, especially if they are also experiencing work-related exhaustion. Workplaces that nurses perceive as more efficient can help to mitigate the effects of violence on nurses' cognitive failure. This study addressed the possible effects of workplace violence as well as work efficiency and competence development on nurses' cognitive failure at work. Analyses revealed primarily indirect effects of workplace violence, and indirect protective effects of work efficiency, on nurses' cognitive failure via work-related exhaustion. This research has implications for healthcare organizations and suggests that efforts made by healthcare workplaces to prevent violence and work-related exhaustion, and to enhance work efficiency, may help to mitigate workplace cognitive failure among nurses. We have followed the STROBE checklist in reporting this study. No Patient or public contribution.

An Evaluation Method of Dental Treatment Quality Combined with Deep Learning and Multi-index Decomposition

ABSTRACT Dentists judge that the quality of dental treatment for each patient is very time-consuming and inefficient, lacks quantitative evaluation criteria, and is easy to cause errors. At the same time, the traditional method of extracting tooth and root canal image features based on experience is difficult to accurately extract the tooth area and root canal filling area, resulting in low accuracy of tooth and root canal segmentation, which in turn affects the accuracy of tooth treatment quality evaluation. In this paper, a deep learning convolutional neural network is used to segment the root canal filling area, tooth boundary, and the boundary between tooth and soft tissue for the real patient ‘s root canal treatment and filling image. Finally, the segmented image is quantitatively evaluated according to the multi-evaluation index of professional doctors. The experimental results show that the intelligent evaluation method of dental treatment quality combined with deep learning and multi-index decomposition proposed in this paper not only unifies the evaluation criteria of dental treatment quality but also the therapeutic effect of quantitative scoring can effectively improve the work efficiency of doctors, which has reference significance for the application of artificial intelligence in the medical field.

Ethical climate and its relationship with attitude to teamwork in operating room nurses: A cross-sectional study

IntroductionIn the nursing profession, ethical climate is considered to be an important element of the work environment. Nurses are exposed to moral tension due to the volume and high work pressure; on the other hand, the stressful nature of this profession can have many negative effects on nurses and, as a result, the quality of care. Therefore, improving the conditions and ethical climate becomes very important. In the operating room, due to the special working conditions and the variety of available specialties, team work is of great importance among the operating room staff. Improving teamwork in the operating room reduces stress and anxiety, increases work efficiency, improves the quality of care, and increases the patient safety. ObjectiveThis study was conducted with the aim of determining the relationship between the ethical climate and the attitude towards teamwork of operating room nurses in hospitals affiliated with Shiraz University of Medical Sciences. MethodThis research was a cross-sectional study conducted in 2022. The study involved a sample of 310 operating room nurses from hospitals affiliated with Shiraz University of Medical Sciences, selected using convenient and purpose-based sampling methods. In order to collect data, the questionnaires of demographic information, Olsan's ethical climate and attitude towards teamwork baker were used. The collected data were analyzed by SPSS V20. FindingsThe average score of the operating room staff from the ethical climate was 94.12±14.96, and that of the overall attitude towards teamwork was 121.92±11.74, which indicates a favorable attitude towards teamwork. There was a significant relationship between the scores of the ethical climate and the attitude toward teamwork among the operating room personnel (r = 0.339,p < 0.0001). ConclusionThe results showed that there is a significant relationship between the attitude towards teamwork and the ethical climate of operating room nurses. Managers of hospitals and operating rooms can strengthen the spirit of teamwork and create a suitable atmosphere in the operating room by holding training courses and increase safety and productivity there.

ДИФЕРЕНЦІАЛЬНО-ПСИХОЛОГІЧНІ ОСОБЛИВОСТІ СТАВЛЕННЯ ДО ПРАЦІ В УМОВАХ ВОЄННОГО СТАНУ

The study aims to investigate the impact of a state of war on employees’ attitudes towards their work and identify the differential psychological features influencing this process. The article’s goal is to develop justified management strategies aimed at mitigating the effects of the state of war on the employees’ mental well-being and supporting their positive work attitudes. The research methodology included anonymous surveys of personnel (1667 respondents), analysis of results using One-Way ANOVA, and multinomial regression analysis. The obtained results emphasize the significance of traits such as friendliness, emotional stability, and openness to new experiences in shaping a positive work attitude during a state of war. The identified correlations between these traits and the impact of the state of war underscore the need for the development of social competencies among the employees. Social factors, such as satisfaction with the team atmosphere, relationships with colleagues and family, and the influence of office conditions and domestic life, also proved essential for shaping work attitudes in a state of war. A supportive work environment and colleague assistance can be crucial for maintaining a positive psychological climate and work efficiency. In the context of managerial recommendations, the research emphasizes the importance of developing employees’ personal qualities, particularly friendliness, and formulating strategies to support social and psychological well-being in the workplace. Managerial interventions should primarily target female employees and those who are unmarried and hold non-managerial positions in the organization. The article makes a significant contribution to understanding the mechanisms of employee adaptation to stressful conditions and proposes specific approaches to managing psychosocial climate in organizations during crisis situations. The findings can be valuable for managers and HR departments seeking to ensure effective personnel management in unstable conditions and enhance overall workplace comfort and motivation. Key words: state of war, differential psychological features, Big Five, five-factor model of personality, attitudes toward work, motivation, demotivation.

Work Environment and Job Performance: The Mediating Role of Office Ergonomics

This study aimed to address the influence of the Work Environment on employees’ health and safety, comfort, and task accomplishment by investigating office ergonomics as the possible underlying mechanism. The study was conducted in Dodoma City Council, specifically in the ward and Mitaa offices. Data were collected from 79 respondents through a questionnaire. Data were analyzed quantitatively using the Pearson correlation coefficient and regression analysis, and the Sobel test was performed to assess if the mediator variable was significant enough to mediate the relationship between variables. The study has found that work environment and ergonomics have a linear and positive relationship (r = 0.5433, p &lt; .0001). The results have also indicated that ergonomics is related to employee health and safety, comfort, and task accomplishment. The study revealed that most offices in lower local government authorities in Dodoma City Council need ergonomically designed chairs and tables, adequate quality air, and lighting. Inadequacy of these elements risks the office bearers' health and safety, comfort, and performance. Therefore, ergonomics should be a strategic aspect in enhancing work efficiency and productivity in lower local government in Tanzania.

Usability of myocardial work parameters in demonstrating myocardial involvement in INOCA patients.

Myocardial work (MW) is a novel echocardiographic modality, which has been shown to have diagnostic and prognostic values in patients with cardiovascular diseases, patients with obstructive coronary artery disease, in particular. However, only a handful of studies have examined the MW analysis in ischemia with nonobstructive coronary artery (INOCA) disease. This study, therefore, aimed to detect the early left ventricular involvement in INOCA patients diagnosed by an invasive coronary angiography performing the MW analysis. This study included a total of 119 patients with nonobstructive coronary artery disease diagnosed by invasive coronary angiography, who were checked for prior ischemia tests performing myocardial perfusion scintigraphy. Out of these 119 patients, 49 patients developed ischemia (i.e., ischemic group) diagnosed using cardiac single-photon emission computed tomography, whereas 70 patients did not (i.e., nonischemic group). The subjects were divided into three groups based on the global MW tertiles. The groups were compared in terms of the conventional, longitudinal strain, and MW findings by conducting echocardiographic examinations. The study subjects were divided into three groups based on the global constrictive work (GCW) value. The three groups were not statistically different in terms of the mean age of the patients (53.0 ± 12 vs. 52.4 ± 13.3 vs. 52.1 ± 12.3; p = 0.96). Furthermore, the three groups were not statistically different regarding the gender, height, weight, and laboratory parameters of the patients except albumin. There was no statistically difference among the tertiles of GCW groups in the measurements of cardiac chambers, LA diameter, interventricular septum, E wave, and A wave. Also, there was no statistical difference in tissue Doppler recordings. The parameters associated with MW were examined, three groups were not statistically different in terms of the global waste work (GWW) (116 ± 92, 122 ± 73, 135 ± 62, p = 0.52, respectively). In contrast, the three groups were different regarding the Global work index (GWI) (1716 ± 300, 1999 ± 130, 2253 ± 195, p < 0.001, respectively), GCW(1888 ± 206, 2298 ± 75, 2614 ± 155, p < 0.001, respectively), and Global work efficiency parameters (92.8 ± 3.6, 94.4 ± 3.2, 95.1 ± 1.8 p = 0.004, respectively). It was concluded that the MW parameters GCW and GWI may have been used for predicting INOCA in patients.

Research on Fault Diagnosis Method of CNC Machine Tools Based on Integrated MPA Optimised Random Forests

INTRODUCTION: Intelligent diagnosis of CNC machine tool faults can not only early detection and troubleshooting to improve the reliability of machine tool operation and work efficiency, but also in advance of the station short maintenance to extend the life of the machine tool to ensure that the production line of normal production.OBJECTIVES: For the current research on CNC machine tool fault diagnosis, there are problems such as poorly considered feature selection and insufficiently precise methods.METHODS: This paper proposes a CNC machine tool fault diagnosis method based on improving random forest by intelligent optimisation algorithm with integrated learning as the framework. Firstly, the CNC machine tool fault diagnosis process is analysed to extract the CNC machine tool fault features and construct the time domain, frequency domain and time-frequency domain feature system; then, the random forest is improved by the marine predator optimization algorithm with integrated learning as the framework to construct the CNC machine tool fault diagnosis model; finally, the validity and superiority of the proposed method is verified by simulation experiment analysis.RESULTS: The results show that the proposed method meets the real-time requirements while improving the diagnosis accuracy.CONCLUSION: Solve the problem of poor accuracy of fault diagnosis of CNC machine tools and unsound feature system.

Performance of the left ventricular myocardium in patients with a negative test result during exercise stress echocardiography

Aim. To determine the possibility of identifying patients with significant coronary artery disease (CAD) by evaluation of the left ventricular (LV) myocardial work indicators by constructing pressure-strain loops despite a negative test result during exercise stress echocardiography. Materials and methods. The study included 79 patients with suspected or previously confirmed CAD, of which 47 (59%) men, who had a negative test result during exercise stress echocardiography on the treadmill. Global work index (GWI), global constructive work (GCW), global wasted work (GWW) and global work efficiency (GWE) were evaluated using the technique of constructing pressure-strain loops at rest and at peak exercise. Results. With similar systolic blood pressure and LV ejection fraction at peak exercise between the control group and the group of patients with single-vessel CAD, there was revealed significant difference in GWI, GCW and GWE at peak exercise. In patients with multi-vessel CAD, GWI and GCW also significantly differed from the control group at peak exercise. Conclusion. The evaluation of LV myocardial work indicators may be recommended for a more accurate diagnosis of CAD in negative or unreliable test results during exercise stress echocardiography.