A Review: Remote Sensing Sensors

The cost of launching satellites is getting lower and lower due to the reusability of rockets (NASA, 2015) and using single missions to launch multiple satellites (up to 37, Russia, 2014). In addition, low-orbit satellite constellations have been employed in recent years. These trends indicate that satellite remote sensing has a promising future in acquiring high-resolution data with a low cost and in integrating high-resolution satellite imagery with ground-based sensor data for new applications. These facts have motivated us to develop a comprehensive survey of remote sensing sensor development, including the characteristics of sensors with respect to electromagnetic spectrums (EMSs), imaging and non-imaging sensors, potential research areas, current practices, and the future development of remote sensors.Peer reviewe

The experiences of professional nurses working in district hospitals in the Western Cape metropole, where 72-hour assessments are conducted

Magister Curationis - MCurBackground: The integration of mental health into primary health care meant that patients were admitted into a less restrictive environment. They received treatment for mental illness in their communities, therefore, averting unnecessary hospitalisation in psychiatric hospitals. However, given that patients with mental illnesses were admitted to district hospitals as involuntary mental health care users (MHCUs), this setting was purported to be fraught with challenges for both staff and patients. Aim and objectives: The aim of this study was to explore and describe the experiences of professional nurses, working at selected district hospitals in the Western Cape metropole, where 72-hour assessments of involuntary mental health care users are conducted. The objectives of this study were to determine how the 72-hour unit functioned in the general ward, the experiences of professional nurses regarding the integration of the 72-hour assessment units in the general ward and suggested improvements. Methodology: A qualitative research approach, with a descriptive phenomenological design, was used to collect data through semi-structured interviews from eight (8) professional nurses, working in the two selected district hospitals in the Cape Town metropole area. Purposive sampling was employed to select the participants. Data were analysed using Tesch’s method of qualitative data analysis. Four themes, namely, patient management process affected the functioning of the ward, patient management challenges in rendering patient care, burden of caring on the Self, and staff and patient support to create a therapeutic environment, emerged during data analysis, which encapsulated the nurse's experience of working in 72-hour assessment units in selected district hospitals. Findings: The findings of this revealed that the district hospitals were ill prepared for the admission of involuntary mental health care users. There were challenges, in terms of resources, namely, infrastructure to create a therapeutic environment, knowledgeable and skilled staff to care for the MHCUs. The MHCUs were contained in the district hospitals for longer than was legislated, rather than receiving therapeutic interventions at psychiatric facilities. Needs were identified to improve the functioning of the 72-hour assessment units, which included education and training of personnel, Discussion: The non-therapeutic environment had a negative impact on the staff working in the 72-hour assessment units. Nursing staff were burdened with caring for patients in an environment where they, as well as the MHCUs, were stigmatised due to the diagnosis of mental illness. However, the participants internalised their own experiences, as they prioritised the MHCUs well-being. The findings supported previous studies, which revealed that the objectives of the Mental Health Care Act (No. 17 of 2002), which supported the integration of mental health into primary health care, were not realised after more than a decade of implementation. Recommendations: Given the limited scope of this thesis, replications of this study in other district hospitals are recommended, in order to ascertain whether the objectives of the MHCA (2002), regarding 72-hour assessments, have been realised. A therapeutic environment, which includes infrastructure and resources to ensure that MHCUs receive care, treatment and rehabilitation within the district hospitals, is required. The recruitment and retention of adequate, skilled permanent staff is crucial, to ensure that MHCUs receive care, treatment and rehabilitation. Finally, the training and education of all personnel (including security) working in the selected district hospitals should be mandatory, in order to address patient care and stigma related to mental illness

An Ultrasonic Reverse Time Migration Imaging Method Based on Higher-Order Singular Value Decomposition

An ultrasonic reverse time migration imaging method, based on high-order singular value decomposition, is proposed in the study to solve the problems of low signal-to-noise ratio (SNR) and excessive artifacts in defect ultrasonic detection imaging results of materials with high noise levels. In this method, based on the 3D structural properties of the ultrasonic full-matrix capture data, higher-order singular value decomposition is directly performed with the 3D data. The method overcomes the difficulty in selecting the number of singular values in the original singular value decomposition noise-reduction algorithm and realizes the one-step noise reduction processing of all the signals. Subsequently, the reverse time migration imaging is performed in the frequency domain, and high-quality acoustic images are obtained. The effects of the number of array elements, the center frequency of the excitation signal, and the number of defects on the denoising effect of the algorithm are investigated. It was experimentally demonstrated that the method could suppress the interference of noise signals and significantly improve the imaging SNR compared with total focusing method and the reverse time migration

Effect of Work Values on Miners’ Safety Behavior: The Mediating Role of Psychological Empowerment and the Moderating Role of Safety Climate

Although numerous studies have confirmed the important influence of values on employees’ behavior, less is known about the relationship between work values and miners’ safe behavior. Based on self-verification theory and trait activation theory, this study constructed a structural equation model to explore the effect of work values on miners’ safety behavior, using psychological empowerment as a mediating variable and safety climate as a moderating variable. Data were collected from 207 miners in three coal mines in China. The model was examined using a hierarchical regression analysis and the bootstrapping method. The results showed that three types of work values significantly and positively predicted miners’ safety behavior, and psychological empowerment mediated the relationship between work values and miners’ safety behavior. However, the moderating role of safety climate was not supported. The results enrich the boundary conditions under which work values influence miners’ safety behavior and provide coal managers with intervention measures such as cultivating miners’ work values and psychological empowerment, which can improve miners’ safety behavior

Forests and Forestry in Support of Sustainable Development Goals (SDGs): A Bibliometric Analysis

To address the world’s ongoing environmental challenges, 193 countries have committed to 17 sustainable development goals (SDGs) concerning the economy, society, and the environment. However, there are gaps in our understanding of forests and forestry support SDGs. Through a systematized review, we identified which SDGs are relevant to forests and forestry at the target level, along with their interactions (synergies or tradeoffs). In addition, a bibliometric analysis of 377 papers was conducted worldwide between 2015 and 2020, to elucidate the status and development trends of SDG research related to forests and forestry in this study. The research results show that: (1) 11 SDGs and 19 targets are related to forests and forestry, and 47 are interactions between SDG15 and other targets, including 35 synergy effects and 12 tradeoff effects. (2) The USA is the highest publication output country, while the Chinese Academy of Sciences is the highest publication output institution, and Jianguo Liu of the University of Michigan is the highest publication output author. (3) The keyword co-occurrence analysis results show that the research hotspots mainly focused on the impacts of and responses to climate change, biodiversity conservation, land resource protection and management, remote sensing, the impacts of deforestation, and the promotion of sustainable development through governance. (4) The co-citation results reveal the existence of nine research themes: human well-being, food security, land use, land productivity, land tenure, tree loss, simulation models, criteria, and resilience