bluuebunny/crossref_metadata_2025 huggingface dataset:
A Sampling-Based Approach for Achieving Desired Patterns of Probabilistic Coverage with Distributed Sensor Networks
Authors: Costa Russell , Wettergren Thomas A.
Published: June 2023

A new method is derived for finding the best positions in which to locate the sensors in a distributed sensor network in order to achieve a desired variation, or pattern, in spatial coverage over a specified domain. Such patterning is important in situations when there are not enough sensors to completely cover a region adequately. By providing coverage based on a desired pattern, this approach allows a user/designer to specify which sub-regions of the domain are more important to cover, and to what level that is desired. The method that is developed is novel in that it is an analytic approach, as opposed to existing numerical optimization approaches, and thus provides solutions rapidly and can also be applied to provide online repositioning for existing sensor networks to respond to changes in the environment. The method is based on deriving an expression for the probabilistic density of sensor locations that best matches the desired coverage under given spatially varying environmental conditions; and then samples from that sensor density to determine specific sensor locations. The performance of the method is demonstrated on numerical examples in both one-dimensional and two-dimensional settings. Comparisons are made between solutions found from this approach and solutions obtained by a numerical optimization technique.
Non-Orthogonal Multiple Access with One-Bit Analog-to-Digital Converters Using Threshold Adaptation
Authors: Min Moonsik , Kong Jae-Ik , Kim Tae-Kyoung
Published: June 2023

In digital communication systems featuring high-resolution analog-to-digital converters (ADCs), the utilization of successive interference cancellation and detection can enhance the capacity of a Gaussian multiple access channel (MAC) by combining signals from multiple transmitters in a non-orthogonal manner. Conversely, in systems employing one-bit ADCs, it is exceedingly difficult to eliminate non-orthogonal interference using digital signal processing due to the considerable distortion present in the received signal when employing such ADCs. As a result, the Gaussian MAC does not yield significant capacity gains in such cases. To address this issue, we demonstrate that, under a given deterministic interference, the capacity of a one-bit-quantized channel becomes equivalent to the capacity without interference when an appropriate threshold value is chosen. This finding suggests the potential for indirect interference cancellation in the analog domain, facilitating the proposition of an efficient successive interference cancellation and detection scheme. We analyze the achievable rate of the proposed scheme by deriving the mutual information between the transmitted and received signals at each detection stage. The obtained results indicate that the sum rate of the proposed scheme generally outperforms conventional methods, with the achievable upper bound being twice as high as that of the conventional methods. Additionally, we have developed an optimal transmit power allocation algorithm to maximize the sum rate in fading channels.
Studies of Angular Resolution for Acoustic Arc Arrays
Authors: Sednev Dmitry A. , Soldatov Alexey I. , Soldatov Andrey A. , Kostina Maria A. , Dolmatov Dmitry O. , Koneva Daria A.
Published: June 2023

Currently, phased arrays are increasingly used in ultrasonic nondestructive testing. One of the most important parameters of ultrasonic nondestructive testing with the application of phased arrays is the angular resolution. This paper presents the results of studies of the angular resolution of concave and convex acoustic arrays in ultrasonic testing with the application of the total focusing method. Computer modeling of concave and convex acoustic arrays consisting of 16, 32 and 64 elements with distances between elements of 0.5 and 1 mm and arc radii of 30 and 60 mm have been performed. The results obtained by computer modeling were confirmed via in situ experiments.
Planning Reclamation, Diagnosis and Reuse in Norwegian Timber Construction with Circular Economy Investment and Operating Costs for Information
Authors: Litleskare Sondre , Wuyts Wendy
Published: June 2023

Different actors in the circularity transition of the timber construction sector investigate, propose and implement workflows to enable the reclamation of materials from unused construction and their reuse in new projects or renovation projects. This study sought to evaluate different workflows in the Norwegian timber construction sector based on the perceived practical problems, opinions and attitudes of value chain actors. This multiple-method study, conducted in September 2021–March 2023, utilised desktop-based document research, marginal and participatory observations and interviews with innovation actors in Southern Norway, focused on planning the reclamation, diagnosis and reuse of (solid) timber. This study synthesised and validated opinions and experiences concerning investment and operation costs and highlighted the need for integrated resource management from a value chain perspective. The study proposes a framework for a set of processes for managers and recommendations for policy, practice and research. This paper initiates a discussion regarding whether CE implementation should be planned by local governments, be self-organised or require an intermediary governance model. In addition, this paper concludes with a call for future steps investigating the (perceived) fair distribution of costs, benefits and risks, as well as a multilevel workflow for data and information resources.
Antioxidant Performance of Borago officinalis Leaf Essential Oil and Protective Effect on Thermal Oxidation of Fish Oil
Authors: Hasdemir Özlem , Kesbiç Osman Sabri , Cravana Cristina , Fazio Francesco
Published: June 2023

This study aimed to determine the antioxidant activity of Borago officinalis essential oil in the thermal oxidation of fish oil. The volatile compound profile of B. officinalis essential oil (BEO) was determined using gas chromatography and mass spectrometry. As a result of the analysis, 97.27 percent of the volatile components of the product were characterized. The product’s major components were benzene acetaldehyde (28.59 percent) and linalool (13.60 percent). As a result of the free radical scavenging activity determined using 2-diphenyl-1-picrylhydrazyl (DPPH) analysis, its antioxidant activity was determined, and a 50 percent inhibitory concentration value was calculated as 736.06 ppm. In order to determine the protective effect of the BEO on fish oil oxidation, 0% (BEO0), 0.1% (BEO0.1), 0.5% (BEO0.5), 1% (BEO1), and 3% (BEO3) ratios of BEO were added to the fish oil, and the experimental groups were kept at 70 °C for 24 h with continuous ventilation for the thermal oxidation process. As a result of the oxidation study, it was determined that the addition of BEO suppressed fish oil oxidation, and the oxidation radicals in the product decreased significantly (p < 0.05) depending on the BEO concentration. In conclusion, it was determined that 1 percent BEO supplementation minimized the oxidation of fish oil under various temperature and ventilation conditions.
Mechanical Soil Resistance Influenced by Different Tillage Systems and Tractor Tire Pressures
Authors: Benković Robert , Jug Danijel , Šumanovac Luka , Jug Irena , Mirosavljević Krunoslav , Zimmer Domagoj , Benković-Lačić Teuta
Published: June 2023

Intensive agricultural practices affect soil compaction, and their indirect and direct effects on crop growth and development are an increasingly important focus of scientific research. The objective of this study was to determine the influence of different tillage systems on soil compaction and to observe the influence of tractor tire pressure on penetrometer resistance during sowing. The three-year study was conducted on the heavy pseudogley soil of Brod-Posavina County in the Republic of Croatia. During the research, crops were observed in the following cropping sequence: soybean (Glycine max L.) in the first year, maize (Zea mays L.) in the second year and winter wheat (Triticum aestivum L.) in the third year. The tillage systems as the main study factor were conventional tillage (CT) plowing to a depth of 35 cm, disc tillage (DH) to a depth of 15 cm, loosening (CH) to a depth of 30 cm, and undermining (SS) to a depth of 50 cm. The following pressures were used as a subfactor of this study, namely the pressure of the front and rear tires of the tractor during sowing: p1 (front 1.0 bar/rear 0.8 bar), p2 (front 2.0 bar/rear 1.6 bar), and p3 (front 3.0 bar/rear 2.4 bar). The tillage systems applied resulted in different soil compaction, thus the deepest tillage SS had the lowest resistance and the DH tillage had the highest resistance in all three experimental years. Penetrometer measurements showed the influence of tire pressure p1 on reducing compaction as early as the first year in 2017, while in the last year of research in 2019, tractor tire pressure p3 during sowing contributed to a significant increase in soil compaction.
Bearing Capacity Analysis of the Weak Basement, Progressive Destruction Analysis, and Evaluation of the Dump on an Inclined Strip Section Using the Upper-Limit Method: A Case Study in an Anonymous Open-Cast Coal Mine
Authors: Hong Yan , Du Han , Chen Mingxi
Published: June 2023

Due to terrain and transportation constraints, some open cast mines have to choose a weak basement as their tailings dumping grounds. Therefore, ensuring the bearing capacity and slope stability of dumping grounds on the weak basement is of great significance for the production capacity and economic benefits of open cast mining. To ensure the safety of surrounding facilities and the normal production of open cast mines, the bearing capacity of the dumping ground of a certain open cast mine was calculated using the oblique strip method and verified by numerical simulation. On this basis, the potential failure mode of the dumping ground base was analyzed, and the ultimate bearing capacity of the dumping ground under current conditions was calculated. The results are as follows: (1) The ultimate bearing capacity of the current dumping ground base is 3781 kPa, and the failure mode of the base is overall shear sliding along the base of the dumping ground. (2) When the slope foot increases from 12° to 18°, the stability coefficient and critical bearing capacity coefficient of the slope base decrease by about 21% and 46%, respectively. The slope angle has a greater impact on the bearing capacity of the base, and the height of the slope body has a relatively small impact, with almost no width effect. (3) Compared with the classic Terzaghi method and Prandtl method, the ultimate bearing capacity of the dumping ground base determined using the oblique strip method proposed in this paper is closer to the numerical simulation results, with an error of no more than 5%, a consistent critical sliding surface, and results that are relatively consistent with the engineering practice monitoring of the surface uplift part. The calculation results of the bearing capacity of the weak basement of open cast mine dumping grounds using the oblique strip method are reliable.
Analysis of the Impact of Livelihood Capital on Livelihood Strategies of Leased-In Farmland Households: A Case Study of Jiangxi Province, China
Authors: Huang Longjunjiang , Liao Cong , Guo Xuan , Liu Yanlin , Liu Xiaojin
Published: June 2023

In the context of the implementation of the rural revitalization strategy, the industrialization of agriculture and rural areas is rapidly increasing, and more and more capable people in rural management are actively leasing land to develop modern agriculture, broaden diversified livelihood channels, and pursue sustainable development. We used leased-in farmland households as an entry point, focusing on the development of rural industries and the choice of livelihood strategies to fill a gap in the existing literature. Based on sustainable livelihood theory, we constructed a sustainable livelihood analysis framework for leased-in farmland households using the survey data of 283 leased-in farmland households in Yudu County. A livelihood capital indicator system was constructed, and the entropy value method and other measurement methods were used. Firstly, we analyzed and comprehensively evaluated the livelihood capital and livelihood strategies of leased-in farmland households in Yudu County, Jiangxi Province. We then used binary logistic regression models and polynomial logistic regression models to analyze the influence of the differentiation in leased-in farmland households’ livelihood capital on the choice of livelihood strategies and their transformation and conducted robustness tests on the relevant findings. Different types of livelihood capital have different effects on agriculture-led livelihood strategies. Natural capital and physical capital have significant positive effects on agriculture-led livelihood strategies, but financial capital, human capital, and social capital have negative effects. Natural capital has a significant negative effect on the pluriactivity strategy, while physical, human, and social capital have insignificant effects on it. For off-farm livelihood strategies, natural capital and financial capital have insignificant effects, physical capital has a significant negative effect, and human capital and social capital have a significant positive contribution.
Pre- and during COVID-19: Households’ Willingness to Pay for Local Organic Food in Italy
Authors: Bigerna Simona , Marchini Andrea , Micheli Silvia , Polinori Paolo
Published: June 2023

Food demand and food supply have been heavily affected by the COVID-19 pandemic. To understand changes in households’ behavior related to the pandemic, we investigated the willingness to pay for local organic apples before and during the COVID-19 pandemic. We assessed the changes that occurred within families, estimating separate models for the two members of a couple. Our findings show that respondents have a positive price premium for local organic apples, whose consumption helps reduce the environmental costs associated with food production. The median estimated values during the pandemic ranged from 34% to 250%. Overall, respondents show a positive mean willingness to pay, which increased with the pandemic. The socio-economic variables are the most important in explaining the willingness to pay, while the behavioral variables have more heterogeneous results, even if lifestyle and the request for information through the label are also important variables. The pandemic tended to narrow the gaps in preferences between members of a couple. In conclusion, the local and organic dimensions are embodied in the short chain, in which knowledge and trust in the producer are crucial elements in the consumer’s choices.
Intelligent Identification and Prediction Mineral Resources Deposit Based on Deep Learning
Authors: Gao Le , Wang Kun , Zhang Xin , Wang Chen
Published: June 2023

In recent years, the intelligent identification and prediction of ore deposits based on deep learning algorithm and image processing technology has gradually become one of the main research frontiers in the field of geological and metallogenic prediction. However, this method also has many problems that need to be solved. For example: (1) There are very few trainable image samples containing mineral point labels; (2) the geological image features are small and irregular, and the image similarity is high; (3) it is difficult to calculate the influence of different geological prospecting factors on ore mineralization. Based on this, this paper constructs a deep learning network model multiscale feature attention framework (MFAF) based on geoimage data. The results show that the MFCA-Net module in the MFAF model can solve the problem of scarce mine label images to a certain extent. In addition, the channel attention mechanism SE-Net module can quantify the difference in influence of different source factors on mineralization. The prediction map is obtained by applying the MFAF model in the study of deposit identification and prediction in the research area of the southern section of the Qin-hang metallogenic belt. The experimental results show that the areas numbered 5, 9, 16, 28, 34, 41, 50, 72, 74, 75, 80, 97, 101, 124, and 130 have great metallogenic potential and this method would be a promising tool for metallogenic prediction. A large number of experimental results show that this method has obvious advantages over other state-of-the-art methods in the prediction of prospecting target areas, and the prediction effect in the samples with mines is greatly improved. The multi-scale feature fusion and attention mechanism MFAF in this paper can provide a new way of thinking for geologists in mineral exploration. The research of this paper also provides resource guarantees and technical support for the sustainable exploitation of mineral resources and the sustainable growth of society and economy.
Method for Selecting the Vehicles That Can Enter a Street Network to Maintain the Speed on Links above a Speed Threshold
Authors: Carrillo-González José Gerardo , López-Maldonado Guillermo , Lopez-Sauceda Juan , Perez-Martinez Francisco
Published: June 2023

The introduced method is a proposal for detecting spaces (links) and times (90 s periods) where the average speed is below the desirable, and for selecting vehicles in those spaces and times so that vehicles are systematically and gradually reduced from one simulation to another until we get a simulation presenting the desirable average speed in all space and time. With our method can be detected the specific vehicles that can enter a street network so that the average speed on the network’ links be always greater than a speed threshold. The speed on a segment is calculated from two perspectives: (1) the general speed (vg), calculated with measurements and estimates, used to estimate the links’ travel times for selecting the vehicles routes, (2) the particular speed (vp), calculated without estimates and for segments with traffic light only with measurements performed during an interval of the green time, used to identify links and periods of unacceptable (low) speed. We test our method with different origin-destination (OD) tables, for each OD table we obtain the number of vehicles that can enter the network in 1 h so all links and periods present acceptable speed. Another result was, for each link, the change of the average (and of the standard deviation) of VG (the vector containing the vg of each period) between the final (after our method) and initial (the traffic conditions without our method) simulations, therefore the percentages of the links presenting a convenient change were evidenced. We did the same with VP (the vp of each period).
Motivations for Peer-to-Peer Accommodation: Exploring Sustainable Choices in Collaborative Consumption
Authors: Delgado Ana Catarina , Soares Raquel Reis , Proença João F.
Published: June 2023

This research aims to contribute to the growing body of knowledge of Collaborative Consumption (CC) by exploring the motivations that influence the use of Peer-to-Peer (P2P) accommodation platforms from the demand side. There has been a significant increase in interest in sustainable choices regarding P2P accommodation in recent years. To address this gap and contribute to the collaborative consumption and P2P accommodation theory, a quantitative study was conducted through a survey yielding 235 responses from both users and non-users of P2P platforms. The findings of this study suggest that P2P accommodation platform usage is influenced by multiple factors, including sustainability, belonging, economic benefits, and convenience. Interestingly, the study also found that individuals with higher levels of academic qualifications are more likely to adopt this mode of consumption. Moreover, the study is the first of its kind to quantitatively address this topic. By understanding the motivations of P2P platform users, policymakers and practitioners can develop targeted strategies to promote sustainable choices in this sector. Overall, this study provides a useful framework for future research on collaborative consumption and sustainable P2P accommodation.
Robust Gas-Path Fault Diagnosis with Sliding Mode Applied in Aero-Engine Distributed Control System
Authors: Chang Xiaodong , Qiu Xiaojie
Published: June 2023

The technology of aero-engine gas-path fault diagnosis is an important way to improve flight safety and reliability and reduce maintenance costs. With the maturity of the new-generation engine distributed control system (DCS), uncertainties such as bus packet loss, time delay, and node function degradation have increasingly highlighted new challenges to engine fault diagnosis. At present, linear Kalman filter (LKF) is widely researched and used in engine fault detection and isolation (FDI), but its robustness has proved to be not strong. However, the sliding mode observer (SMO) is not only capable of fault reconstruction but also robust to system uncertainties and disturbances due to its unique discontinuous switching term, which tends to be an effective way to achieve robust fault diagnosis for aero engines and DCS with many uncertainties. This paper initially develops a distributed bus packaging model that supports time-delay and packet-loss simulating and timing planning based on SimEvents, providing a basis for the model-based design and verification. Then the SMO is adopted to design a robust gas-path diagnosis method for engine DCS, and the robust observing accuracy is improved by combining high-order sliding mode theory, LMI optimized observation matrix, and variable gain. The simulation results show the effectiveness and advantages in engine DCS application scenarios.
The Analysis of Bifurcation, Quasi-Periodic and Solitons Patterns to the New Form of the Generalized q-Deformed Sinh-Gordon Equation
Authors: Kazmi Syeda Sarwat , Jhangeer Adil , Raza Nauman , Alrebdi Haifa I. , Abdel-Aty Abdel-Haleem , Eleuch Hichem
Published: June 2023

In this manuscript, a new form of the generalized q-deformed Sinh-Gordon equation is investigated which could model physical systems with broken symmetries and to incorporate phenomena involving amplification or dissipation. The proposed model is explored based on the Lie symmetry approach. Using similarity reduction, the partial differential equation is transformed into an ordinary differential equation. By employing the generalized auxiliary equation approach, precise results for the derived equation are obtained. The solutions are graphically depicted as 3D, 2D, and contour plots. Furthermore, the qualitative analysis of the considered model is investigated by employing the concepts of bifurcation and chaos. The phase profiles are displayed for different sets of the parameters. Additionally, by applying an external periodic strength, quasi-periodic and chaotic behaviors are documented. Various tools for detecting chaos are discussed, including 3D and 2D phase patterns, time series, and Poincaré maps. Additionally, a sensitivity analysis is conducted for various initial conditions. The obtained findings are unique and indicate the viability and efficacy of the suggested strategies for evaluating soliton solutions and phase illustrations for various nonlinear models.
Banach Fixed Point Theorems in Generalized Metric Space Endowed with the Hadamard Product
Authors: Omran Saleh , Masmali Ibtisam , Alhamzi Ghaliah
Published: June 2023

In this paper, we prove some Banach fixed point theorems in generalized metric space where the contractive conditions are endowed with the Hadamard product of real symmetric positive definite matrices. Since the condition that a matrix A converges to zero is not needed, this produces stronger results than those of Perov. As an application of our results, we study the existence and uniqueness of the solution for a system of matrix equations.
Modulation of Reoviral Cytolysis (I): Combination Therapeutics
Authors: Mori Yoshinori , Nishikawa Sandra G. , Fratiloiu Andreea R. , Tsutsui Mio , Kataoka Hiromi , Joh Takashi , Johnston Randal N.
Published: June 2023

Patients with stage IV gastric cancer suffer from dismal outcomes, a challenge especially in many Asian populations and for which new therapeutic options are needed. To explore this issue, we used oncolytic reovirus in combination with currently used chemotherapeutic drugs (irinotecan, paclitaxel, and docetaxel) for the treatment of gastric and other gastrointestinal cancer cells in vitro and in a mouse model. Cell viability in vitro was quantified by WST-1 assays in human cancer cell lines treated with reovirus and/or chemotherapeutic agents. The expression of reovirus protein and caspase activity was determined by flow cytometry. For in vivo studies, athymic mice received intratumoral injections of reovirus in combination with irinotecan or paclitaxel, after which tumor size was monitored. In contrast to expectations, we found that reoviral oncolysis was only poorly correlated with Ras pathway activation. Even so, the combination of reovirus with chemotherapeutic agents showed synergistic cytopathic effects in vitro, plus enhanced reovirus replication and apoptosis. In vivo experiments showed that reovirus alone can reduce tumor size and that the combination of reovirus with chemotherapeutic agents enhances this effect. Thus, we find that oncolytic reovirus therapy is effective against gastric cancer. Moreover, the combination of reovirus and chemotherapeutic agents synergistically enhanced cytotoxicity in human gastric cancer cell lines in vitro and in vivo. Our data support the use of reovirus in combination with chemotherapy in further clinical trials, and highlight the need for better biomarkers for reoviral oncolytic responsiveness.
Modulation of Reoviral Cytolysis (II): Cellular Stemness
Authors: Bourhill Tarryn , Rohani Leili , Kumar Mehul , Bose Pinaki , Rancourt Derrick , Johnston Randal N.
Published: June 2023

Oncolytic viruses (OVs) are an emerging cancer therapeutic that are intended to act by selectively targeting and lysing cancerous cells and by stimulating anti-tumour immune responses, while leaving normal cells mainly unaffected. Reovirus is a well-studied OV that is undergoing advanced clinical trials and has received FDA approval in selected circumstances. However, the mechanisms governing reoviral selectivity are not well characterised despite many years of effort, including those in our accompanying paper where we characterize pathways that do not consistently modulate reoviral cytolysis. We have earlier shown that reovirus is capable of infecting and lysing both certain types of cancer cells and also cancer stem cells, and here we demonstrate its ability to also infect and kill healthy pluripotent stem cells (PSCs). This led us to hypothesize that pathways responsible for stemness may constitute a novel route for the modulation of reoviral tropism. We find that reovirus is capable of killing both murine and human embryonic and induced pluripotent stem cells. Differentiation of PSCs alters the cells’ reoviral-permissive state to a resistant one. In a breast cancer cell line that was resistant to reoviral oncolysis, induction of pluripotency programming rendered the cells permissive to cytolysis. Bioinformatic analysis indicates that expression of the Yamanaka pluripotency factors may be associated with regulating reoviral selectivity. Mechanistic insights from these studies will be useful for the advancement of reoviral oncolytic therapy.
Dynamics of Coastal Aquifers: Conceptualization and Steady-State Calibration of Multilayer Aquifer System—Southern Coast of Emilia Romagna
Authors: Cherubini Claudia , Sathish Sadhasivam , Pastore Nicola
Published: June 2023

Worldwide, coastal aquifers have been heavily exploited by socio economic activities for several decades, and climate change and sea level rise have also been threatening coastal aquifers. The authorities and policymakers have been advised to find the solutions in order to achieve sustainable water resources management. The southern part of Po delta, Italy is a low-lying coastal area also experiencing tectonic activity. Along with low-lying topography, unstable shore line and sea level, the groundwater is heavily exploited by this deltaic multilayered system of aquifers. Hence, a multilayer three-dimensional model of this aquifer system has allowed for the investigation of the response of aquifer to natural and anthropogenic exploitation. The present work regards the conceptualization of the multilayer aquifer system using lithological cross-sections, surface water features, and appropriate boundary conditions and the steady-state flow modelling. The spatially distributed elevations of the groundwater table and piezometric head from the different aquifers have been calibrated. The values of model error statistics at a satisfactory range, such as R-squared, mean error, root-mean-squared error and model efficiency, confirm that the developed model is reliable, and calibration is obtained with good match between observed and simulated data. The developed model can be used as a decision-making tool for the authorities and policymakers in order to plan for sustainable water management.
Determination of the Canal Discharge Capacity Ratio and Roughness to Assess Its Maintenance Status: Application in Egypt
Authors: Gabr Mohamed Elsayed , Fattouh Ehab M. , Mostafa Mohamed K.
Published: June 2023

Waterlogging and soil salinity issues can be handled using surface or subsurface drainage networks, soil bed elevation, and soil and crop management patterns. A properly operating and maintained drainage system is important for both rural and urban inhabitants to protect lives and property from flooding and high groundwater levels, enhance health conditions, and safeguards water purity, soil salinity, and waterlogging. It also supports and increases crop yields and consequently rural incomes. This study assessed the maintenance condition of the main surface drains (Baloza and ELFarama) located in the Tina Plain (50,000 acres) and a portion of the Southeast El-Kantara regions (25,000 acres) in North Sinai, Egypt, based on the values of the Discharge Capacity Ratio (DCR) and Manning’s roughness (n). Ten measurement locations at the drain cross-section were used in the investigation. For the ELFarama Drain, the average values of n and DCR were found to be 0.029 and 86.2%, and for the Baloza Drain, they were 0.032 and 78.6%, respectively. Compared to the design values, the actual Manning’s roughness was higher, indicating that the drainage canals’ capacities had been reduced and that their upkeep was inadequate. In both drains, sedimentation is present and they need to be maintained, according to the hydrographic surveying results for the actual cross-sections compared to the planned cross-sections. A methodology for the channel maintenance method is presented. For removing vegetation and dredging sediment, a long-boom mechanical hydraulic excavator with a bucket is suggested and to be conducted every two years. To the results of this study, the amount of weed infestation in vegetated channels is the main factor that affects Manning’s roughness coefficient value. It is now easier to calculate the proportion of weeds that are submerged in vegetated channels using echo-sound sonar technology. The DCR is an affordable and simple methodology to assess the channel maintenance status for sustainable agriculture.
Microalgae Cultivation Using Municipal Wastewater and Anaerobic Membrane Effluent: Lipid Production and Nutrient Removal
Authors: Tang Jialing , Qu Xiangjiang , Chen Si , Pu Yunhui , He Xinrui , Zhou Zhihui , Wang Huijun , Jin Ni , Huang Jin , Shah Faisal , Hu Yisong , Abomohra Abdelfatah
Published: June 2023

Microalgae cultivation using wastewater is a combined process for pollutant removal and lipid production that has been widely studied in recent years. In this study, the effects of anaerobic membrane effluent (AME) and municipal wastewater (MW) ratios on microalgae growth and pollutant removal processes were investigated, and the lipid production properties were also explored. Results show that microalgae can grow in all AME/WW ratios, and a 40% AME content is the optimal condition for microalgal biomass accumulation (52.9 mg/L·d) and lipid production (0.378 g/L). Higher AME addition would inhibit microalgae growth. In addition, high ammonia (approximately 97%) and phosphate (around 90%) removal efficiencies can be achieved in all AME/WW ratio conditions, while the total nitrogen removal efficiencies decreased with the addition of AME. Total nitrogen and phosphate are the limiting factors in treating water to meet the requirements of the integrated wastewater discharge standard. This study provided a new method for anaerobic digestion and municipal wastewater treatment and also realized green energy production based on the sustainable development principles.
Baseline Study on Microplastic Distribution in the Open Surface Waters of the Korean Southwest Sea
Authors: Min Byeong Kyu , Jeong Hui Ho , Ju Mi Jo , Ko Uni , Dae Keum Hyang , Kim Hyun Jung , Cho Chon Rae , Soh Ho Young , Ishibashi Yasuhiro , Cho Hyeon Seo
Published: June 2023

This study investigated microplastic distribution characteristics by collecting surface seawater from sea areas to the south of Jeju Island in August 2020. The average microplastic abundance was 0.46 ± 0.27 particles/L (n = 23), and PE had a high ratio, averaging 53%. The levels of fragments and fibers were observed to be 69% and 31% on average, respectively. The most common size of the microplastics was on average 0.02–0.30 mm at a level of 69%. We found a higher abundance of microplastics in the study area than in other open waters such as the Arctic Central Basin and the Atlantic Ocean, whereas the abundance was lower than that in previous studies on coastal areas. We studied an area of open sea connecting China, Japan, and the Pacific Ocean, and, in this region, the microplastic distribution varies depending on sea currents in the surrounding areas. In the summer, the western and central regions of the study sea area have low salinity levels due to discharge from China’s Yangtze River. This generally indicates that high-density plastic deposits are found in the Yangtze River estuary, and low-density plastics are found in the study area. Furthermore, this implies that low- and high-density plastics are transported in water for long periods of time due to the Taiwan Warm Current and because the eastern sea area has high salinity.
Applications and Challenges of Lithium-Sulfur Electrochemical Batteries
Authors: Al Essa Mohammed Jasim M.
Published: June 2023

This paper presents applications of lithium-sulfur (Li-S) energy storage batteries, while showing merits and demerits of several techniques to mitigate their electrochemical challenges. Unmanned aerial vehicles, electric cars, and grid-scale energy storage systems represent main applications of Li-S batteries due to their low cost, high specific capacity, and light weight. However, polysulfide shuttle effects, low conductivities, and low coulombic efficiencies signify key challenges of Li-S batteries, causing high volumetric changes, dendritic growths, and limited cycling performances. Solid-state electrolytes, interfacial interlayers, and electrocatalysts denote promising methods to mitigate such challenges. Moreover, nanomaterials have capability to improve kinetic reactions of Li-S batteries based on several properties of nanoparticles to immobilize sulfur in cathodes, stabilizing lithium in anodes while controlling volumetric growths. Li-S energy storage technologies are able to satisfy requirements of future markets for advanced rechargeable batteries with high-power densities and low costs, considering environmentally friendly systems based on renewable energy sources.
Operational Plan for Maternity Nursing Practice of Nursing Students
Authors:   Korean Society of Nursing Research, Wang Hee Jung
Published: June 2023

Purpose : The purpose of this study was to identify students’ nursing activities and core skills, and to compare clinical competency and clinical practice satisfaction with the clinical nursing practice in women’s health nursing.
Methods : The data were collected using Naver Online-questionnaire from 96 nursing students. The data were analyzed using the IBM SPSS 21.0 program, descriptive statistics, independent t-test, and the Pearson’s correlation coefficient.
Result : The contents of nursing activities in delivery room and obstetric gynecologic ward differed by the hospital type. Clinical competency was the lowest nursing process, nursing skills. Clinical practice satisfaction was the lowest practice contents, and field leaders’ practical guidance was higher in general hospital than in women’s hospital. Clinical competency and clinical practice satisfaction showed significant positive correlation.
Conclusion : To improve the quality of clinical nursing activities, active guidance from practical guidance professors and practical hospital is required, and the personnel dedicated to education should be used for the practical training.
The Effect of New Nurse’s Reality Shock, Workplace Bullying, and Positive Psychological Capital on Turnover Intention
Authors:   Korean Society of Nursing Research, Kim Soo Yeon , Kim Su Hee
Published: June 2023

Purpose : The purpose of this study was to examine the levels of reality shock, workplace bullying, positive psychological capital, and turnover intention for new nurses, and to find out the effects of these factors on turnover intention.
Methods : The study included 159 new nurses working at five general or high-level general hospitals in three locations. The survey was conducted from January 13 to February 7, 2021. The collected data were analyzed using the SPSS/WIN25.0 program.
Results : The mean score for turnover intention was 3.42±0.75. The turnover intention was correlated with reality shock (r＝0.28, p＜.001) and workplace bullying (r＝0.45, p ＜.001). The variables affecting turnover intention were the general ward (β＝0.25, p＝.049), nurse career spanning ≥ 6 months (β＝0.16, p＝.031), lack of experience in clinical practice at workplace institutions (β＝ 0.16, p＝.026), and high workplace bullying (β＝0.36, p＜.001). The total amount of explanation for turnover intention was 25%.
Conclusion : In order to reduce the turnover intention of newly graduated nurses, hospitals should implement systematic personnel management programs and actively participate in student internships. Additionally, at the government level, effective policies should be introduced to decrease excessive workload among nurses as a measure to reduce workplace bullying among new nurses.
Development of the Evidence-based Pain Management, Pressure Ulcer Care, Fall Prevention Care, and Drainage Tube Management Protocol for Nursing Students
Authors:   Korean Society of Nursing Research, Park Sun Jung , Lim Young Sook , Ko Ga Yeon , Kim Yeun Mi , Park Byung Jun , Park Sun Young , Shin Hye Sun , Jang Hyo Yoel
Published: June 2023

Purpose : The purpose of this study is to develop an evidence-based nursing protocol to systematically educate nursing students on pain management, pressure ulcer care and fall prevention, and drainage tube management, which are the core nursing skills newly established during the 4th cycle.
Methods : This is a methodological study intended to develop a protocols for pain management, pressure ulcer care, fall prevention care, and drainage tube management of nursing students by preparing a preliminary protocol to develop systematic pain management, pressure ulcer care and fall prevention care, and drainage tube management protocol for the core nursing skills education of nursing students, and by verifying content validity and user validity to investigate clinical applicability.
Result : This study developed a protocol consisted of 18 questions for pain management, 17 questions for pressure ulcer care and fall prevention care, and 25 questions for the drainage tube management protocol of newly established core nursing skills.
Conclusion : In the court of developing the protocol, an expert group was included to evaluate the appropriateness and applicability of the protocol use, and hence, it is expected that it will be used effectively for the evaluation of core nursing skills.
Penerapan Metode Silver Meal Heuristic untuk Minimasi Biaya Persediaan Bahan Baku Tahu
Authors: Yetrina Mutiara , Rifki Muhida  , Abu Bakri
Published: June 2023

UMKM Pabrik Tahu AL merupakan salah satu produsen tahu yang beralamat di Kecamatan Kuranji, Kota Padang, Sumatera Barat. Secara umum permasalahan kurangnya persediaan bahan baku menduduki peringkat utama dalam permasalahan produksi pada Pabrik Tahu AL. Akibat dari kekurangan tersebut, terjadi kehilangan keuntungan yang diperoleh dan kadang pula terjadi kelebihan persediaan bahan baku sehingga menimbulkan biaya persediaan. Penelitian ini termasuk kedalam penelitian yang bersifat kuantitatif. Penelitian kuantitatif adalah metode penelitian yang mengumpulkan dan menganalisis data numerik untuk memahami fenomena dan menjawab pertanyaan penelitian. Pendekatan ini menggunakan pendekatan ilmiah dan berfokus pada pengukuran objektif dan analisis statistik. Penelitian kuantitatif mengumpulkan data antara lain data persediaan, data kelebihan dan kekurangan bahan baku tahu. Metode yang digunakan untuk pengolahan data yaitu metode Silver-Meal Heuristic. Dari hasil pengolahan data diperoleh hasil bahwa metode ini menghasilkan total biaya persediaan bahan baku yang lebih kecil dari pada total biaya persediaan yang diterapkan oleh Home industry Pabrik Tahu AL selama ini, Berdasarkan data dari bulan Januari 2020 sampai Desember  2021, dari  kedua  metode  pengendalian  persediaan  bahan  baku  dapat  disimpulkan bahwa metode Silver-Meal Heuristic lebih efisien siap apabila dibandingkan dengan metode Riil home industry dengan tingkat efisiensi sebesar 5,42 persen.
New records of Reduviidae (Hemiptera: Heteroptera) from Costa Rica, Ecuador, French Guiana, Paraguay, and Peru
Authors: Gil-Santana Hélcio R. , Husemann Martin
Published: June 2023

New records of species of Reduviidae from five Neotropical countries are provided: Notocyrtus gibbus (Fabricius) (Harpactorinae: Harpactorini) from Costa Rica; Kodormus bruneosus Barber (Stenopodainae), Ploeogaster gesana Kirkaldy (Harpactorinae: Harpactorini), Pseudopothea paulai GilSantana (Ectrichodiinae) from Ecuador; Leogorrus immaculatus Champion (Reduviinae), Myocoris nugax Stål (Harpactorinae: Harpactorini) from French Guiana; Zelurus tibialis tibialis (Stål) (Reduviinae) from Paraguay; Apiomerus elegans Distant, Apiomerus lituratus Stål, Apiomerus nitidicollis Stål (Harpactorinae: Apiomerini), Aristathlus regalis Bergroth, Cosmoclopius nigroannulatus (Stål), K. bruneosus, Montina lobata Stål (Harpactorinae: Harpactorini), Pothea jaguaris (Carpintero) (Ectrichodiinae), and Saica apicalis Osborn & Drake (Saicinae) from Peru. This new data improves our knowledge on the distribution of this interesting relevant group of heteropterans.
Poéticas, paisajes y disrupciones en la cerámica
Authors:   , Balo Julia
Published: June 2023

Este trabajo de investigación aborda los recorridos y aportes producidos en los Encuentros Nacionales de Cerámica en las voces de las y los ceramistas protagonistas. El enfoque puesto en las hipótesis –el encuentro como un dispositivo pregunta acerca de las prácticas disruptivas en la cerámica, como también si estas prácticas se han constituido en legados. En esta misma dirección, interroga si los Encuentros han posibilitado para las búsquedas de políticas decoloniales formas poéticas populares, emergentes y descentradas en Argentina con proyección a los países limítrofes. Se presentan en forma de Capítulos en tres ejes que nuclean la problemática de interés: Las prácticas disruptivas, los paisajes en clave decolonial. Entendemos a los planos del saber provenientes del arte y las ciencias como permeables, lo que nos adelanta un nuevo plano contingente que resulta común. En esta instancia no nos interesa discriminar dónde limita cada uno de ellos, asumiendo la no existencia de purismos y recuperando como de gran riqueza epistémica, los pliegues y los cruces de estos planos que se analizan por separado, siendo necesarios e interdependientes entre si. Como objetivos específicos se describir los modos en que fueron realizadas las prácticas donde se presenta el extrañamiento que rompe la matriz perceptiva como sesgo contemporáneo, en cuáles se hace presente como quiebre de la tradición cerámica y de qué manera lo hace.
The Impact of Teaching and Learning Changes During the COVID-19 Pandemic on the Post-Pandemic Era
Authors: Zhang Zhuojing , Gillespie Carol
Published: June 2023

The unforeseen COVID-19 pandemic had drastically changed everyone's life. The sudden shift to distance learning during the pandemic had significant implications for educational stakeholders. Many existing studies focus on the characteristics of forced distance learning for elementary and higher education. However, as school reopening has been applied worldwide nowadays, the impact of the educational experience gained during the outbreak on its potential long-term effects in the post-pandemic era is not well studied. To this end, this paper leverages a survey-based approach to investigate these changes and their potential issues and opportunities in the post-pandemic education era. The definitions of key terms are first provided. The attributes of distance learning during the COVID-19 pandemic are next reviewed. Changes in education when schools reopened after the pandemic are then described. Gaps in the current research are finally discussed.
The crisis of family relations in modern society as one of the reasons for the low effectiveness of juvenile delinquency prevention
Authors: Zheludkov Mikhail , Alekseeva Anna
Published: June 2023

Introduction: The relevance of this article lies in the fact that the prevention of juvenile delinquency in modern Russia cannot be focused only on the perceptions of those families that lead a parasitic lifestyle or those with only one parent. Obviously, in order to increase the effectiveness of such prevention, attention should be paid not only to statistics on the personality of juvenile delinquents or the number of single-parent families and families with a negative environment line, but also to the factors that led to mistakes or shortcomings in family upbringing for the subsequent identification of causes and conditions of the type of crime.

Methods: Various methods of knowledge were used in writing the article: dialectical, statistical and analytical methods. The material for the study was practical examples, normative legal acts, statistical data, as well as scientific researches of authors studying the problems of the crisis of family relations in modern society.

Results: On the basis of general scientific dialectic method of cognition the crisis moments of family relations in modern society were considered, which are proposed to be a condition for delinquent behavior of minors and young people. It was found out that value orientations in family and issues of achievement of social status for its members are put in direct dependence of certain gender background or social trends, imposed by Internet-groups. The authors try to answer the question whether it is possible to predict juvenile delinquency by identifying families with signs of exclusion from external norms and rules of conduct for the subsequent preventive social influence or it is better to restrict preventive measures in relation to families with explicit signs of antisocial behavior.