bluuebunny/crossref_metadata_2025 huggingface dataset:
Reducción de la eficiencia de un PMSM con control seis-pulsos con respecto al vectorial: Estudio teórico y validación experimental
Authors: Bucciarelli Agustin , Duarte Juan Diego , De Angelo Cristian , Rey Juan Manuel , Quiroga Óscar
Published: February 2024

La selección de la estrategia de control para un motor síncrono de imanes permanentes o PMSM (del inglés Permanent Magnet Synchronous Motor) depende sus aspectos constructivos, aplicación específica y del costo de implementación de dicha estrategia. Por ello, resulta de interés el estudio de diferentes alternativas de control considerando a su impacto sobre variables críticas tales como la potencia máxima desarrollada y el rendimiento del motor. Este artículo presenta el análisis teórico y la validación experimental de un modelo para la estimación del desempeño de un PMSM al ser controlado con dos estrategias diferentes, específicamente, control vectorial por campo orientado y control Seis-Pulsos. Se estudian las ecuaciones que modelan las pérdidas del motor y se estiman para un conjunto de puntos de operación, los cuales son contrastados con los resultados obtenidos de los ensayos experimentales en los que se evalúan los mapas de eficiencia de la máquina para las dos estrategias de control estudiadas. Los resultados del modelo muestran una adecuada correlación cuando es ajustado con datos del ensayo. Por último se propone una aproximación simplificada para estimar la degradación de la eficiencia en el punto nominal de operación.
Schutzzaunsystem zur Abtrennung und Sicherung von Prüfzellen - Transparent trennen und schützen
Authors:   Bernd Klöpper
Published: February 2024

Im F+E-Bereich in der neuen Deutschlandzentrale des Automobilzulieferers Faureciasollten die Testbereiche für Autositze nicht in hermetisch geschlossenen Räumenuntergebracht werden. Stattdessen wollte man durch entsprechend gestalteteund angeordnete Trennwände ein System aus anforderungsgerecht abgesichertenPrüfzellen scha en. Wie dies optisch ansprechend, transparent und dabei sichergelang, erfahren Sie nachfolgend.
Lacklager und Farbversorgungsräume gesetzteskonform realisieren - So lagern Lacke richtig
Authors:   Maren Schlichting
Published: February 2024

Lacklager und Versorgungsräume inder industriellen Lackiertechnik beherbergenüblicherweise flüssige Beschichtungsstoffeund Verdünnungen, die erheblicheGesundheits- und Umweltrisiken mit sichbringen. Um Arbeitsunfälle, Berufskrankheitenund Umweltschäden zu verhindern, ist diesorgfältige Planung dieser Räume als integralerBestandteil einer umfassenden Präventionsstrategie im Umgang mit Gefahrstoffenunerlässlich. Dabei ist einiges zu beachten
Effect of adipose tissue-derived stromal vascular fraction on the viability of random-pattern skin flaps: an experimental study
Authors: Kul Zekeriya , Özsoy Zafer
Published: February 2024

Aims: Random pattern skin flaps are still widely used in plastic surgery. However, necrosis in distal flap sections resulting from ischemia is a serious problem, increasing the cost of treatment and hospitalization. The aim of this study was to test the effects of adipose tissue derived stromal vascular fraction (SVF) on random pattern skin flaps in rats.
Methods: In this experimental study conducted on Wistar rats, three groups were formed using the simple random sampling technique. Group 1 consisted of rats with a raised flap and a subcutaneous SVF injection. Group 2 comprised rats that underwent a flap operation with no additional treatment. Group 3 included rats with a raised flap and a subcutaneous saline injection. Tissue necrosis and level of survival area was detected with planimetric method and histopathologic examination was performed for detect of level of vascular density. On the 7th day post-operation, the viability assessment was calculated based on the ratio of the living flap area to the total flap area.
Results: The mean viability rate in Group 1 was higher compared to other groups, while there was no significant difference between Group 2 and Group 3 (Group 1 = 79.2 ± 4.9 % vs. Group 2 = 41.0 ± 5.9 % vs. Group 3= 39.2 ± 2.7 %, p < 0.001). The mean vascular densities of the flaps were higher in Group 1 compared to the other groups, while it were similar between Group 2 and Group 3 (Group 1 = 29.8 ± 1.2 vs. Group 2 = 8.4 ± 4.6 vs. Group 3= 9.3 ± 1.8, p < 0.001).
Conclusion: The use of fat tissue-derived SVF injections has been found to be advantageous in improving the survival of random pattern flaps, frequently utilized in plastic and reconstructive surgery.
RELATIONSHIP BETWEEN SUPPLY CHAIN LINKAGES AND VEGETABLE INDUSTRY DEVELOPMENT
Authors: Tran Tuan Anh
Published: February 2024

This study investigates how supply chain linkages and the growth of the vegetable production sector are related. The study has two mediating variables: strategic orientation and competitiveness. Research data was collected from 405 vegetable production units in Hanoi. The study uses the PLS-SEM method to test the proposed hypotheses. Research results provide solutions for developing Hanoi's vegetable supply chain linkages.

Keywords: Vegetable Industry, Supply Chain Linkages, Strategic Orientation, Competitiveness, Hanoi.
Treatment of Deep Mediastinal Infections Following Cardiac Surgery with Pectoral Muscle Flap
Authors: Ovalı Cengiz , Kocaoğlu Alper Selim , Güçlüer Kocaoğlu Merve Nur , Koçman Atacan Emre
Published: February 2024

Introduction: Mediastinitis is a rare occurrence following cardiac surgeries; however, it is a significant cause of both mortality and morbidity. Given the significance of mediastinal infections, early diagnosis, and treatment become of paramount importance. The management of this condition necessitates a multidisciplinary approach, involving collaboration and coordination among various medical specialties.

Patients and Methods: 21 patients with a diagnosis of deep mediastinal infection who were treated at Eskişehir Osmangazi University Medical Faculty Hospital between January 2015 and May 2021 were included in the study. Broad-spectrum antibiotic therapy, serial debridement, and vacuum-assisted closure were applied to all patients. Among the patients who exhibited negative blood cultures and developed granulation tissue, those with tissue losses that did not extend to the sternum incision sites were assessed for potential flap procedures in conjunction with plastic and reconstructive surgery. In such cases, closure of the wound was achieved using a pectoral muscle flap. All patients were followed for one year.

Results: Among the patients, 14 (66.6%) were female and seven (33.3%) were male, with a mean age of 62.7 ± 6.5 (range: 41-76 years). Three of the 21 patients included in the study had type I, two had type II, and 16 had type IIIA mediastinitis. Staphylococcus aureus (S. aureus) was the most commonly isolated microorganism with 11 patients (52.3%). The right pectoralis major muscle was used in four patients (19%), the left pectoralis major muscle in four patients (19%), and the bilateral pectoralis major muscle in 13 patients (62%). There was no need for re-intervention in the follow-up of the patients. No mortality because of infection, surgical muscle flap closure, and/or cardiac causes was observed in any of the patients who were treated.

Conclusion: Mediastinitis is a costly treatment, requiring prolonged hospitalization and carrying the risk of mortality. The main objective is to prevent the occurrence of mediastinitis. We believe that this objective should be pursued through a multidisciplinary approach involving cardiovascular surgery, infectious diseases, and plastic and reconstructive surgery units.
DEVELOPMENT OF STUDENTS WORKSHEET (LKM) BASED ON LIVEWORKSHEET ON THE EXCRETORY MATERIAL
Authors: Nurmiati Nurmiati
Published: February 2024

This research aims to develop and describe student worksheet  on the excretory system materials. This research is an R&D (Research and Development) study based on the ADDIE development model, which consist of 5 stages: Analysis, Design, Development, Implementation, and Evaluation. The research instruments used were validation sheet question and response quesionnaires. The students worksheet was validated by 3 experts: a subject matter expert, a media expert, and a biology lecturer and it was tested on students.The result showed the students worksheet the percentage of achievements was 90% according material expert, 94% according media expert, and 96% according biolgy lecturer. Meanwhile, the student testis resulted in a score of 83,9% with a very feasible criteria. The conclusion of this research is that student worksheet based liveworksheet on the excretory system are highly suitable for supporting the learning process
EFEKTIVITAS PEREDAM KEBISINGAN DENGAN KOMPOSIT POLYESTER DAN SERAT SABUT KELAPA
Authors: Maghfiroh Amalia Ma'rifatul
Published: February 2024

Abstrak: Poliester (Polyester) merupakan jenis material polimer thermosetting yaitu jenis material diman terbentuknya ikatan dibantu oleh panas, katalis atau gabungannya. Matriks ini dapat menghasilkan keserasian matriks-penguat dengan mengontrol faktor jenis dan jumlah komponen, katalis, waktu, dan suhu. Sifatnya tahan creep, memadai selaku perekat struktur berbeban berat, serta tahan kondisi ekstrim panas, radiasi, kelembaban, dan tahan kimia.Bunyi merupakan penyimpangan tekanan pada medium pengantar akibat energi yang dirambatkan dalam bentuk gelombang oleh sumber getar  (Latifa, 2015). Koefisien penyerapan bunyi (α) adalah angka yang menunjukan kemampuan material menyerap energi bunyi. Makin besar koefisiennya, daya serapnya makin tinggi. Penelitian ini dilakukan untuk mengetahui efektivitas peredam kebisingan komposit resin polyester dan serat sabut kelapa. Hasil pengujian akustik komposit ini diperoleh untuk sampel 20 gram, 30 gram dan 40 gram sabut kelapa terlihat bahwa kemampuan meredam bunyi/coefisien absorption (α) terendah adalah -0,006 pada sampel 20 gram sabut kelapa dengan frekuensi 125 Hz dan tertinggi adalah 0,428 untuk sampel 40 gram sabut kelapa pada frekuensi 1000 Hz.

 

Kata Kunci :  Komposit, Peredam Kebisingan, Sabut Kelapa
PELAKSANAAN ASESMEN PEMBELAJARAN MATEMATIKA SMP SELAMA MASA PANDEMI COVID-19
Authors: Fauziah Nabilah
Published: February 2024

Tujuan dari penelitian ini adalah untuk mengetahui bagaimana proses pelaksanaan asesmen pembelajaran matematika SMP selama masa pandemi covid-19. Penelitian ini menggunakan pendekatan kualitatif dengan metode deskriptif. Teknik pengumpulan data dengan menggunakan observasi, wawancara, dan dokumentasi, dengan waktu penelitian mulai dari tanggal 8 November 2021 hingga 30 November 2021. Subjek penelitian yaitu guru matematika SMP Negeri 19 Kota Tangerang. Berdasarkan analisis dari hasil penelitian, didapatkan bahwa pelaksanaan asesmen pembelajaran matematika smp selama masa pandemi covid-19 di SMP Negeri 19 Kota Tangerang sudah berjalan dengan cukup baik, dengan lebih menfokuskan pada pelaksanaan asesmen di ranah kognitif dan psikomotorik. Dalam pelaksanaan asesmen pembelajaran matematika smp selama masa pandemi covid-19 terdapat hambatan yang sangatlah beragam, mulai dari tujuan pembelajaran yang tidak dapat direalisasikan secara sempurna, materi pembelajaran yang tidak dapat semuanya disampaikan, serta kejujuran peserta didik dalam mengerjakan pengerjaan soal. Selain itu, guru juga mengalami kesulitan dalam pengambilan penilaian karena peserta didik selama pandemi diberikan soal berbentuk pilihan ganda melalui google form dan tidak menyertakan cara menjawabnya, sehingga membuat guru ragu mengenai tingkat pemahaman dan kemampuan peserta didik dan keaktifan peserta didik yang di rasa kurang.
The Effect of Outsourcing on Business Operations
Authors: Odigie Isaiah Henry , Olakunle Olayide Asunmo
Published: February 2024

Outsourcing has become a strategic business tool that has a relevant impact on how modern businesses operate. By examining the nuances of outsourcing strategies, organizations can make well-informed decisions that support their objectives and enhance their performance. This study aims to analyze the impact of onshore and offshore outsourcing on corporate operations. Analyzing the relationship between outsourcing and firm performance, this study aims to fill the research gap in literature by providing a thorough analysis of the impact of both onshore and offshore outsourcing on corporate operations. The data was analyzed using the regression technique with the aid of Special Package for Social Science (SPSS). This study contributes to knowledge by offering a comprehensive understanding of the intricate effects of both onshore and offshore outsourcing on corporate operations. The result study reveals that offshore and onshore outsourcing strategies have a substantial impact on operational capabilities. As a result, the study recommended that management should employ onshore and offshore outsourcing strategy is used in order to improve the operational capability of their organization.
Brief Analysis of the Impact of the Informatic Solutions on the Accounting Processes
Authors:   Bucharest University of Economic Studies, 6 Piata Romana, 1st district, Bucharest, 010374 Romania, Ciuvercă Alexandra-Cristina-Daniela
Published: February 2024

The last years have brought significant changes determined by
the rapid progress of the IT field. These changes have spread over the
business environment. To face the change, companies update their business
strategies, acquire new resources adapted to the needs of the present and
look for well-trained employees with a high level of adaptability. The goal –
to increase efficiency at the level of all departments, a very important one
being the financial accounting department. Thus, modern technological
solutions become indispensable for companies. In this context, this study
aims to examine the influence of the evolution of technology and the
specialization of IT tools dedicated to the field of accounting on the
performance level of companies. Equally, this paper captures the influence
that this IT evolution has on the accounting profession and, implicitly, on the
educational programs for the training of specialists. Computer systems
dedicated to the accounting field are becoming essential in the management
and performance of accounting and auditing activities. The method
approached for the elaboration of this literature review is based on the
analysis of relevant studies for this topic and specialized scientific
publications. Following the study, it is concluded that the adoption of
modern IT solutions can bring benefits to employees in the field of
accounting and implicitly to the decision-making system of companies.
Host Community Willingness and Perceived Constraints to Peer-to-Peer Accommodation in South West Nigeria
Authors:   Department of Tourism and Hospitality Management, Elizade University, Ilara-Mokin, Ondo State,
Nigeria, Ojo Idowu
Published: February 2024

Peer-to-peer (P2P) accommodation is a form of sharing economy
which incorporates the host community residents with the tourists. However,
Idanre hills, Ikogosi warm spring and Olumirin waterfalls which were
randomly chosen as destinations from Ondo, Ekiti and Osun State
representing 50% of the South West, Nigeria. Both qualitative and
quantitative research method were used to generate data.342 structured
questionnaires were administered. SPSS was used to analyzed the data
collected while inferential and descriptive statistical tools were adopted for
the demographic data. Study revealed that 58.2% of the respondents were
Male and 41.8% Female, 63.5% were Single while 24% were Married.
Majority of the respondents are within the age range of 35-44(33.6%),
36.3% were farmers, 28.9% were Civil Servants and 48.8% had secondary
school certificate. Majority of the respondents are willing to participate in
P2P accommodation, IH (99.60%), IWS and OWS (100%) respectively as
residents welcomed the idea of sharing their homes with tourists
(mean=4.69). However, security challenge and lack of inter-personal trust
between the hosts and guests (mean=4.70) were the major perceived
constraints to P2P accommodation in the selected communities. The sociodemographic characteristics of respondents such as age, occupation,
religion, education and income were significantly related to their perception
of P2P accommodation. Meanwhile, gender, marital status and ethnicity are
not significantly related. The study concluded that P2P accommodation is
essential for collaborative consumption at ecotourism destinations of South
West, Nigeria.
Implementation of a Business-to-Government (B2G) Sales Analytics Tool - Hermix
Authors:   Katholieke Universiteit Leuven, Oude Markt 13, Leuven, Belgium; Alstoria Global Tech, str. Zizin 6, ap. 19, Bucharest, Romania, Morcov Stefan , Puiu Ana-Maria ,   Alstoria Global Tech, str. Zizin 6, ap. 19, Bucharest, Romania
Published: February 2024

The public sector sales market, i.e. Business-to-Government
(B2G) market is large and relevant. It is similar, yet differs in several key
aspects from other markets such as retail, consumer (B2C), or Businessto-Business (B2B). B2G is huge, at 2 trillion Euro per year in Europe, but
insufficiently researched and it lacks proper tools and methods. Public
contracts are difficult to access and require specialized expertise and a
significant initial investment. This paper explores the implementation and
evaluation of an IT platform that supports and automates public sector
sales, Hermix, in a large company. This study had a qualitative
longitudinal approach. It consisted of 7 workshops and 2 interviews with
8 case study participants, performed over the duration of a year. It
highlights the implementation steps and results. Hermix automated a set
of public sector sales processes for the host company, including: tender
monitoring with email notifications, opportunity qualification, and market
research, i.e. the analysis of the tactical and strategic context: buyers
(public authorities), budgets, competition, partnership affinities, groups
of interest, trends. It uses advanced data analytics, big-data and machine
learning to provide market intelligence such as governmentgraphics,
firmographics, geographics and monetary segmentation. Implementing
public sector sales automation tools provides direct benefits to
companies, related to: cost and time efficiency, improved proposal
success rates, and strategic planning optimization. Indirect benefits for
companies refer to delivery quality. Data analytics tools also support
overall public procurement transparency, public spending efficiency and
better public governance.
Investment Decision Criteria – Bibliometric Analysis
Authors:   Ministry of Education, The Intermediate Body for the Human Capital Operational Program (OI POCU), No. 78-80, Clucerului Street, sector 1, 011368, Bucharest, Romania, Bratiloveanu Florin Ionut , Croitoru Ionut Marius ,   National University of Science and Technology Politehnica Bucharest, Faculty of Entrepreneurship, Business
Engineering and Management, Splaiul Independentei Street, Sector 6, 060042, Romania, Spiridon Cosmin Alexandru ,   West University of Timisoara, Faculty of Economics and Business Administration, No. 16, J.H.Pestalozzi Street,
300115, Timişoara, Romania, Spiridon Paula Paraschiva ,   University of Life Sciences “King Michael I” of Timisoara, No. 119, Calea Aradului, 300645, Timis, Romania, Dragomir Luciana ,   University of Economic Studies Bucharest, Doctoral School, PhD Student, No. 6, Piața Romana, sector 1, 010374, Bucharest, Romania, Jumanca Romanita ,   University of Medicine and Pharmacy Timisoara, No. 2, Piaţa Eftimie Murgu, 300041, Timis, Romania
Published: February 2024

The present study wants to analyze how the criteria underlying the
decision to make an investment in the existing articles in the Web of Science are
highlighted through bibliometric analysis. The query resulted in the display of 441
scientific articles. A specific filter applied to our selection was the choice of Citation
Topics Meso: Economics, Management, Economic Theory to ensure that the analyzed
articles are from the economic field. To determine the correlations regarding the
countries of origin of the authors, we used the Co-authorship filter of VOSviewer,
having a minimum number of 12 documents/country and a minimum number of 10
citations/country, so out of 71 countries only 16 met the conditions. A first analysis of
the phrases used in the 441 articles was carried out with the help of the word cloud,
from Wordart, regarding the words contained in the title of the article, the author's
keywords, plus keywords and summaries. The second analysis was that of the phrase
density, it was carried out through the VOSviewer software by applying the cooccurrence filter, for all keywords, with an appearance of at least 9 times, resulting in
4 clusters with a total of 53 items that define the process of taking decisions, analyze
the investor's behavior and the structure that makes the investment, define the sources
of investment financing and investment performance evaluation modalities and
analyze the risk and uncertainty environment specific to investments. The results of
our research can be a starting point for other analyses in the decision-making field of
investments by providing keywords to start from.
Revealing Multiscale Interdependence between Ethanol
and Corn
Authors:   Institute of Agricultural Economics, Volgina 15, 11060, Belgrade, Serbia, Kuzman Boris
Published: February 2024

One of the key issues nowadays is global warming, while biofuels have been seen as potential solution for this problem. In the recent years, corn is used as a rimary raw material for ethanol production, which means
that these two commodities could be highly interconnected. In this regard,
this paper investigates time and frequency interdependence between corn
and ethanol markets, using the wavelet coherence methodology. As a
preliminary result, wavelet power spectrum reveals that increased volatility
in the corn and ethanol markets is present up to 16 days and around the two
major crisis. The wavelet coherence results clearly indicate that high
interconnection does not exist in the short time-horizons, even at the time of
the pandemic and the war in Ukraine. This means that various external
shocks affect differently the two markets in the short-run. However, the
areas of very high coherence are found in the time-horizons from 32 days
onwards, which means that the movements of the two markets are pretty
much synchronized in the longer time-horizons. This happens because
longer time-horizons characterize the lack of idiosyncratic price
oscillations, which means that external factors affect the two markets
relatively aligned in the long-run. Future studies may use different wavelet
techniques, such as wavelet correlation and cross-wavelet correlation, in
order to overcome deficiencies of the wavelet coherence method.
Technical note: Accurate, reliable, and high-resolution air quality predictions by improving the Copernicus Atmosphere Monitoring Service using a novel statistical post-processing method
Authors: Riccio Angelo , Chianese Elena
Published: February 2024

Abstract. Starting from the regional air quality forecasts produced by the Copernicus Atmosphere Monitoring Service (CAMS), we propose a novel post-processing approach to improve and downscale results on a finer scale. Our approach is based on the combination of ensemble model output statistics (EMOS) with a spatio-temporal interpolation process performed through the stochastic partial differential equation–integrated nested laplace approximation (SPDE-INLA). Our interpolation approach includes several spatial and spatio-temporal predictors, including meteorological variables. A use case is provided that scales down the CAMS forecasts on the Italian peninsula. The calibration is focused on the concentrations of several air quality pollutants (PM10, PM2.5, NO2, and O3) at a daily resolution from a set of 750 monitoring sites, distributed throughout the Italian country. Our results show the key role that conditioning variables play in improving the forecast capabilities of ensemble predictions, thus allowing for a net improvement in the calibration with respect to ordinary EMOS strategies. From a deterministic point of view, the performance of the predictive model shows a significant improvement in the performance of the raw ensemble forecast, with an almost-zero bias, significantly reduced root mean square errors, and correlations that are almost always higher than 0.9 for each pollutant; moreover, the post-processing approach is able to significantly improve the prediction of exceedances, even for very low thresholds, such as those recently recommended by the World Health Organisation. This is particularly significant if a forecasting approach is used to predict air quality conditions and plan adequate human health protection measures, even for low alert thresholds. From a probabilistic point of view, the quality of the forecast was verified in terms of reliability and credible intervals. After post-processing, the predictive probability density functions were sharp and much better calibrated than the raw ensemble forecast. Finally, we present some additional results based on a set of gridded (4 km × 4 km) maps covering the entire Italian country for the detection of areas where pollution peaks occur (exceedances of the current and/or proposed regulatory thresholds).
Effects of changes in climatic conditions on soil water storage patterns
Authors: Ehrhardt Annelie , Groh Jannis S. , Gerke Horst H.
Published: February 2024

Abstract. The soil water storage (SWS) defines crop productivity of a soil and varies under differing climatic conditions. Pattern identification and quantification of these variations remains difficult due to the non-linear behaviour of SWS changes over time. We hypothesize that these patterns can be revealed by applying wavelet analysis to an eight-year time series of SWS, precipitation (P) and actual evapotranspiration (ETa) in similar soils of lysimeters in a colder and drier location and a warmer and wetter location within Germany. Correlations between SWS, P and ETa at these sites might reveal the influence of altered climatic conditions but also from subsequent wet and dry years on SWS changes. We found that wet and dry years exerted influence on SWS changes by leading to faster or slower response times of SWS changes to precipitation in respect to normal years. Extreme precipitation events were visible in SWS and P wavelet spectra. Time shifts in correlations between ETa and SWS became smaller at the wetter and warmer site over time in comparison to the cooler and drier site where they stayed constant. This could be attributed to an earlier onset of the vegetation period over the years and thus to an earlier ETa peak every year and reflects the direct impact of changing climate on soil water budget parameters. Long-term observations (>30 years) might reveal similar time shifts for a drier climate. Analysis of the SWS capacity could provide information on how different climatic conditions affect the long-term storage behaviour of soils.
Dynamically-optimal models of atmospheric motion
Authors: Voronovich Alexander
Published: February 2024

Abstract. A derivation of a dynamical core for the dry atmosphere in the absence of dissipative processes based on the least action (i.e., Hamilton’s) principle is presented. This approach can be considered the finite-element method applied to the calculation and minimization of the action. The algorithm possesses the following characteristic features: (1) For a given set of grid points and a given forward operator the algorithm ensures through the minimization of action maximal closeness (in a broad sense) of the evolution of the discrete system to the motion of the continuous atmosphere (a dynamically-optimal algorithm); (2) The grid points can be irregularly spaced allowing for variable spatial resolution; (3) The spatial resolution can be adjusted locally while executing calculations; (4) By using a set of tetrahedra as finite elements the algorithm ensures a better representation of the topography (piecewise linear rather than staircase); (5) The algorithm automatically calculates the evolution of passive tracers by following the trajectories of the fluid particles, which ensures that all a priori required tracer properties are satisfied. For testing purposes, the algorithm is realized in 2D, and a numerical example representing a convection event is presented.
GMIE-100: a global maximum irrigation extent and irrigation type dataset derived through irrigation performance during drought stress and machine learning method
Authors: Tian Fuyou , Wu Bingfang , Zeng Hongwei , Zhang Miao , Zhu Weiwei , Yan Nana , Lu Yuming , Li Yifan
Published: February 2024

Abstract. Irrigation stands as the primary sector of human water consumption and plays a pivotal role in enhancing crop yields and mitigating drought effects. The precise distribution of irrigation is crucial for effective water resource management and the assessment of food security. However, the existing global irrigated cropland map is characterized by a coarse resolution, typically around 10 kilometers, and is often not regularly updated. In our study, we present a robust methodology that leverages irrigation performance during drought stress as an indicator of crop productivity and water consumption to identify global irrigated cropland. Within each irrigation mapping zone (IMZ), we identified the dry months occurring during the growing season from 2017 to 2019 or the driest months from 2010 to 2019. To delineate irrigated cropland, we utilized collected samples to calculate normalized difference vegetation index (NDVI) thresholds for the dry months of 2017 to 2019 and the NDVI deviation from the ten-year average for the driest month. By combining the results with the higher accuracy between these two methods, we generated the Global Maximum Irrigation Extent dataset at 100-meter resolution (GMIE-100), achieving an overall accuracy of 83.6 %. GMIE-100 reveals that the maximum extent of irrigated cropland encompasses 403.17 million hectares, accounting for 23.4 % of the global cropland. Concentrated in fertile plains and regions adjacent to major rivers, the largest irrigated cropland area is found in India, followed by China, the United States, and Pakistan, ranking 2nd to 4th, respectively. Importantly, the spatial resolution of GMIE-100, at 100 meters, surpasses that of the dominant irrigation map, offering more detailed information essential for supporting estimates of agricultural water use and regional food security assessments. Furthermore, with the help of the DL method, the global central pivot irrigation system (CPIS) was identified using Pivot-Net. We found that there are 11.5 million hectares of CPIS, accounting for about 2.9 % of total irrigated cropland. In Namibia, the US, Saudi Arabia, South Africa, Canada, and Zambia, the CPIS proportion was larger than 10 %. To our best knowledge, this is the first effort to identify irrigation methods globally. The GMIE-100 dataset containing both or irrigated extent and CPIS distribution is accessible on Harvard Dataverse at: https://doi.org/10.7910/DVN/HKBAQQ (Tian et al., 2023a).
Water depth estimate and flood extent enhancement for satellite-based inundation maps
Authors: Betterle Andrea , Salamon Peter
Published: February 2024

Abstract. Floods are extreme hydrological events that can reshape the landscape, transform entire ecosystems, and alter the relationship of humans and animals with the surrounding environment. Every year, fluvial and coastal floods claim thousands of human lives and cause billions of euros in direct damages and inestimable indirect losses, in both economical and in life-quality terms. Monitoring the spatio-temporal evolution of floods is of fundamental importance in order to reduce their devastating consequences. Observing floods from space can make the difference: from this distant vantage point it is possible to monitor large areas consistently and, by leveraging multiple sensors on different satellites, it is possible to acquire a comprehensive overview on the evolution of floods at a global scale. Synthetic Aperture Radar (SAR) sensors in particular have proven extremely effective for flood monitoring, as they can operate day and night and in all weather conditions, with a highly discriminatory power. On the other hand, SAR sensors are unable to reliably detect water in certain conditions, the most critical being urban areas. Furthermore, flood water depth – which is a fundamental variable for emergency response and impact calculations – cannot be estimated remotely. In order to address such limitations, this study proposes a framework for estimating flood water depths and enhancing satellite-based flood delineations, based on readily available topographical data. The methodology is specifically designed to accommodate, as additional inputs, masks delineating water bodies and/or areas that are excluded from flood mapping. In particular, the method relies on simple morphological arguments to expand flooded areas to cover excluded regions, and to estimate water depths based on the terrain elevation of the boundaries between flooded and non-flooded areas. The underlying algorithm – named FLEXTH – is provided as Python code and is designed to run in an unsupervised mode in a reasonable time over areas of several hundred thousand square kilometers. This new tool aims to quantify and ultimately to reduce the impacts of floods, especially when used in synergy with the recently released Global Flood Monitoring product of the Copernicus Emergency Management Service.
Mengenal Angka Melalui Media Kartu Angka Pada Anak Usia Dini di RA Nurul Ummi Binjai Baru Kabupaten Batubara
Authors: Syahrizal Syahrizal , Manurung Ade Karunia Rizky
Published: February 2024

Developing various skills of children according to age level and taking into account the characteristics of development, creatively teachers can make and use game tools that come from the surrounding environment and utilize used goods or media that already exist or are available. The formulation of the problem in this study is: How is the condition of children recognizing numbers, the use of number card media, and the condition of children recognizing numbers through number cards in Early Childhood RA Nurul Ummi Binjai Baru, Batubara Regency. This research uses qualitative research by describing in the form of words and language, in a special natural context, and by utilizing various natural methods. The results of the research that the authors found were that: The condition of children recognizing numbers in RA Nurul Ummi Binjai Baru, Batubara Regency Knowing numbers has become mandatory, children consider numbers as a series of meaningless words and learning to recognize numbers is boring. Teachers must use interesting and fun methods and media in introducing the concept of numbers. The state of using number card media at RA Nurul Ummi Binjai Baru, Batubara Regency, is a number card or card props are tools or equipment used by a teacher in teaching in the form of cards with numbers written in accordance with the theme being taught. Card props are tools for children to remember lessons. Letter card props can make an impression on the heart so that children don't easily forget them. In line with the child's memory of the props, he is also reminded of the lesson delivered by the teacher. The younger the child, the more he needs visualization/concrete (needs more props) that he can touch, see, feel, and hear. The conclusions are: The condition of children recognizing numbers through the media of number cards in Early Childhood at RA Nurul Ummi Binjai Baru, Batubara Regency, efforts to improve children's abilities through the media of numbers with the use of number card media that are applied in PAUD are very suitable for playing with cards can improve the ability to recognize numbers and provide excellent results for the development of children's abilities.
مشكلات استخدام تكنولوجيا التعليم في تدريس المرحلة الابتدائية من وجهة نظر معلمات المهارات الرقمية والحلول في ضوء نظرية الابتكارات الكاسحة (دراسة حالة)
Authors:   أستاذ مساعد تقنيات وتصميم التعليم، جامعة جدة، المملكة العربية السعودية, السحيم العنود
Published: February 2024

هدف البحث إلى التعرف على مشكلات استخدام تكنولوجيا التعليم في تدريس المرحلة الابتدائية من وجهة نظر معلمات المهارات الرقمية والحلول في ضوء نظرية الابتكارات الكاسحة. واعتمد البحث المنهج النوعي؛ إذ استُخدمت المقابلات المقننة كأداة رئيسة لجمع المعلومات اللازمة. تكون مجتمع البحث من معلمات من تخصصات مختلفة التحقن بالدراسة في الدبلوم العالي للمهارات الرقمية ممن يدرِّسن المرحلة الابتدائية، وتكونت العينة من (7) مشاركات ممن تطوعن للمشاركة في البحث. وأشارت نتائج البحث على الرغم أن المعلمات استخدمن أساليب مختلفة مكتوبة ومقروءة ومسموعة ومصورة في تعليم المهارات الرقمية، إلا أن هناك العديد من المشاكل التي تواجه المعلمات في استخدام تكنولوجيا التعليم، مثل: قلة التدريب، وعدم توفر معامل الحاسوب المجهزة والبنية التحتية للاتصالات والشبكات والإمكانيات اللازمة في بعض المدارس؛ لارتفاع التكلفة، إلا أن تبني الجهات المعنية في التعليم نظرة إيجابية نحو نظرية الابتكارات الكاسحة واستخدامها يمكن أن يساعد في التغلب على بعض هذه المشكلات من خلال عقد صفقات مع الشركات والمؤسسات التي توفر البنية التحتية للشبكات والاتصالات والإمكانيات اللازمة التكنولوجية والبرمجية بتكاليف منخفضة وجودة مناسبة لتحسين جودة التعليم، كما أوصى البحث بتدريب المعلمات على استخدام التكنولوجيا، وتزويدهن بالمواد والأدوات التعليمية التكنولوجية المناسبة وتصميم وإنتاج التطبيقات التعليمية الجديدة والمبتكرة بتكلفة منخفضة وجودة مناسبة في سهل الحصول عليها وفي متناول الجميع وبما يتوافق مع نظرية الابتكارات الكاسحة، والاهتمام بالتقييم والتقويم الالكتروني الدائم.
العادات الغذائية في المجتمع السعودي وعلاقتها بالتحولات الاجتماعية الحديثة (دراسة ميدانية بمحافظة الأحساء)
Authors:   ماجستير علم الاجتماع، جامعة الملك فيصل، الأحساء، المملكة العربية السعودية, الخُميّس عماد , درويش الحبيب ,   أستاذ مشارك، قسم الدراسات الاجتماعية، كلية الآداب، جامعة الملك فيصل، المملكة العربية السعودية
Published: February 2024

تأتي هذه الدراسة البحثية بهدف التعرف على علاقة العادات الغذائية في المجتمع السعودي بالتحولات الاجتماعية الحديثة، وذلك من خلال دراسة ميدانية بمحافظة الأحساء. ولتحقيق أهداف الدراسة، استخدم الباحثان منهج دراسة الحالة، بالإضافة إلى استخدام المقابلة والملاحظة كأدوات لجمع البيانات من عينة الدراسة، حيث طبقت هذه الدراسة على حالات مدروسة تم اختيارها من سكان محافظة الأحساء، ويبلغ حجم عينة الدراسة (25) حالة. ولقد توصل الباحثان إلى عدد من النتائج، أهمها ما يلي: العادات الغذائية داخل المجتمع السعودي تأثرت بشكل سلبي بفعل العولمة وحركة الانفتاح التي شهدتها المملكة. يعاني بعض من عينة الدراسة من مشكلات إتباع أنظمة غذائية غير مفيدة قائمة على أساس الترف والاستهلاك المظهري. لا تهتم الجهات الصحية والمؤسسات التعليمية بتحسين مستوى الوعي الغذائي الصحي من خلال البرامج الإعلامية، وتضمين دروس توعوية في المناهج الدراسية. ومن خلال النتائج التي تم توصل إليها، اقترح الباحثان عدد من المقترحات، وأهمها ما يلي: توجد حاجة كبيرة لزيادة الوعي فيما يتعلق بالعادات الغذائية الصحية وتدابير السلامة العامة وأهمية النشاط البدني في المنزل. هناك حاجة متزايدة لدراسة وتحديد المعرفة والمواقف لطبيعة العادات الغذائية المتبعة داخل المجتمع السعودي، وذلك من أجل قيادتهم نحو اتباع نظام غذائي صحي. ضرورة زيادة اهتمام الجهات المختصة مثل وزارة الصحة ووزارة الإعلام بتعزيز دورهم في التوعية التغذوية أهمية اختيار النوعية المناسبة من الغذاء، مما يقلل نسبة السمنة.
أساليب التفكير وعلاقتها بالتسويف الأكاديمي لدى طالبات جامعة أم القرى
Authors:   ماجستير علم نفس، جامعة أم القرى، مكة المكرمة، المملكة العربية السعودية, جنادي شيماء
Published: February 2024

هدفت هذه الدراسة إلى التعرف على أساليب التفكير ومستوى التسويف الأكاديمي والكشف عن العلاقة بينهما لدى طالبات جامعة أم القرى وتحديد الفروق في متغيرات الدراسة وفقاً للتخصص الدراسي (إنسانية – علمية) والمستويات العليا والدنيا وتكونت عينة الدراسة من (456) طالبة من طالبات الكليات المختلفة بجامعة أم القرى، واتبعت الدراسة المنهج الوصفي (الارتباطي- المقارن)، وتمثلت أدوات الدراسة في مقياسي: قائمة أساليب التفكير لسترنبرج وواجنر (1991). وتوصلت الدراسة إلى أن أساليب التفكير السائدة لدى الطالبات جاءت حسب الترتيب التالي: الأسلوب الملكي و الأسلوب التشريعي ينطبق بدرجة كبيرة، و باقي الأساليب تنطبق بدرجات صغيرة متفاوتة، ومستوى التسويف الأكاديمي لدى الطالبات جاء في المستوى المتوسط، بينما أظهرت النتائج وجود ارتباط موجب ودال إحصائياً بين أساليب التفكير (الأقلي، والفوضوي، والخارجي) والتسويف الأكاديمي، وجدت فروق ذات دلالة إحصائية بين طالبات التخصصات العلمية والإنسانية في كلا من الأسلوب الحكمي والأسلوب العالمي، كما أظهرت النتائج وجود فروق ذات دلالة إحصائية بين طالبات المستويات العليا وطالبات المستويات الدنيا في جميع أساليب التفكير. وأوصت الدراسة بالعمل على استخدام استراتيجيات تدريس تناسب أساليب التفكير السائدة لدى الطالبات وهي (الملكي، التشريعي، الهرمي، التنفيذي)، العمل على توفير دورات تدريبية للتخلص من مشكلة التسويف الأكاديمي، وأن تحرص عضوات هيئة التدريس على مساعدة الطالبات للتخلص من ظاهرة التسويف الأكاديمي وذلك بإعادة النظر في الواجبات والتكليفات التي تسندنها للطالبات
مدى توافر عناصر بيئة العمل الابتكارية بالتطبيق على مجلس الشورى
Authors:   ماجستير إدارة أعمال، كليات الشرق العربي/ موظف في مجلس الشورى، المملكة العربية السعودية, الشدي حسام
Published: February 2024

هدفت الدراسة إلى التعرف على مدى توافر أبعاد بيئة العمل الابتكارية في مجلس الشورى من وجهة نظر العاملين، لقد استخدمت الدراسة المنهج الوصفي التحليلي، واعتمدت على الاستبانة كأداة للدراسة وطبقت على عينة بلغ عددها 191 من العاملين بمجلس الشورى. وتوصل الباحث لعدة نتائج من أهمها أن أبعاد البيئة الابتكارية المتمثلة في: اهتمام الإدارة ببيئة العمل المادية، اهتمام الإدارة بالتغيير تطبيق قواعد العمل بدرجة صارمة، الخوف من الأخطاء وتجنب اتخاذ قرارات بها مخاطر، تفويض السلطات والمشاركة في اتخاذ القرارات، اهتمام الإدارة بمقترحات العاملين وتشجيع الأفكار الجديدة متوفرة في مجلس الشورى بمستوى متوسط حيث كانت نسبة التوافر 63% بمتوسط حسابي بلغ (3.22) من أصل (5)، ولقت تمثلت أهمية التوصيات بضرورة اهتمام الإدارة العليا بمقترحات العاملين وتشجيعهم على تقديم الأفكار الجديدة، فضلا عن رعاية الأشخاص المبتكرين وتمييزهم ومكافأتهم، وتشجيع العاملين على عرض تعرض قضايا العمل بموضوعية وحياد لصالح العمل ودون الميل لرأي دون الآخر، كما يجب على الإدارة العليا العمل على تحديد المسؤوليات للعاملين بوضوح فضلا عن تطبيق قواعد العمل بحزم على جميع العاملين، كما يجب أيضا الاهتمام بتطبيق تقنيات التكنولوجيا الحديثة وتدريب العاملين عليها للإسهام في تحسين جودة العمل الفردي والتنظيمي، والاهتمام بالتطوير والتغيير وإعطاء عناية قصوى للابتكار لمواكبة التغييرات السريعة في البيئة، وهذا يتطلب تصميم وتنفيذ البرامج التدريبية التطويرية للعاملين، وضرورة الاهتمام بتطوير بيئة العمل المادية كالأجهزة والأدوات المستخدمة فضلا تجويد التشطيبات وتخفيض الضوضاء في مكان العمل.
دراسة مسحية لقياس أثر برامج تعليم الكبار في رفع التحصيل العلمي بمدارس تعليم الكبيرات بمنطقة الجوف
Authors:   مديرة إدارة التعليم المستمر بإدارة التعليم بالجوف، المملكة العربية السعودية, الذويب حنان , العنزي حمدة ,   مشرفة بإدارة التعليم المستمر بالجوف، المملكة العربية السعودية
Published: February 2024

هدفت هذه الدراسة إلى قياس أثر برامج إدارة تعليم الكبار على التحصيل العلمي بمدارس تعليم الكبيرات بمنطقة الجوف، وتحديد المؤثرات الخارجة عن تخصص إدارة التعليم على التحصيل العلمي، والمقارنة بين المناطق في التحصيل العلمي في مدارس تعليم الكبيرات في منطقة الجوف، وتحديد عناصر العملية التعليمية التي تحتاج تعزيزا، أو تجويدا، أو تعديلا، أو تبديلا. ولتحقيق هذا الهدف اعتمدت الدراسة على المنهج الوصفي التحليلي؛ وتمثلت أداة الدراسة في الاستبانة لجمع المعلومات والبيانات، وتم تطبيقها على عينة مكونة من (139) معلمات ومديرات المدارس، ووكيلاتها، ومشرفات البرامج فيها من المناطق الأربع التي تتبع لإدارة تعليم الكبيرات بمنطقة الجوف، وهي: سكاكا- صوير- دومة الجندل- طبرجل. وتوصلت نتائج الدراسة إلى إن البرامج التعليمية التي تشرف عليها إدارة تعليم الكبار في الجوف تؤثر إيجابا على التحصيل الدراسي للطالبات بمدارس الكبيرات بنسبة 22.3%، وأن الدافع الذاتي للطالبات إجمالا يؤثر على التحصيل في مدارس الكبيرات في الجوف بنسبة 71.8%، وأن العوامل الاجتماعية تؤثر على التحصيل الدراسي إيجاباً بنسبة 20.7%، وأن العوامل الثقافية تؤثر على التحصيل الدراسي إيجاباً بنسبة 9%. وأوصت الدراسة بضرورة افتتاح مدارس متوسطة في المناطق التي ليس فيها مدارس متوسطة، وثانوية في التي ليس فيها ثانوية. الاستفادة من تقنيات التعليم الإلكترونية في تثبيت المعلومات، على أن تدرس هذه الكيفية لئلا توصل إلى عكس المراد.
واقع الأمية من وجهة نظر الملتحقات ببرنامج محو الأمية (دراسة ميدانية عن وجود الأمية في منطقة الجوف)
Authors:   مشرفة بإدارة التعليم المستمر بالجوف، المملكة العربية السعودية, الضميري خلود
Published: February 2024

هدفت الدراسة الكشف عن واقع برامج محو الأمية في منطقة الجوف. ولتحقيق هذا الهدف اعتمدت الدراسة على المنهج الوصفي التحليلي. وتمثلت أداة الدراسة استبانة لجمع البيانات والمعلومات، وتم تطبيقها على 49 مبحوث من الدارسات الملتحقات بإحدى برامج محو الأمية في منطقة الجوف. وتوصلت نتائج الدراسة إلى: أن(100.0%) من المبحوثات أكدن أن الالتحاق بإحدى برامج محو الأمية أثر في تنظيم شؤون حياتهن الدينية، أن (93.9%) من المبحوثات أكدن أن الالتحاق بإحدى برامج محو الأمية أثر في أثر في تنظيم شؤون حياتهن الأسرية الصحية. وأن (89.8%) من المبحوثات أكدن أن الالتحاق بإحدى برامج محو الأمية أثر في أثر في تنظيم شؤون حياتهن الأسرية الغذائية. وأن(95.9%) من المبحوثات أكدن أن الالتحاق بإحدى برامج محو الأمية أثر في أثر في تنظيم شؤون حياتهن الأسرية التربوية. وأن (85.7%) من المبحوثات أكدن أن الالتحاق بإحدى برامج محو الأمية أثر في أثر في تنظيم شؤون حياتهن الأسرية الاقتصادية. وأن (87.8%) من المبحوثات أكدن أن الالتحاق بإحدى برامج محو الأمية أثر في أثر إيجابا في حياتهن الزوجية. وأن(98.0%) من المبحوثات أكدن أن الالتحاق بإحدى برامج محو الأمية أدى إلى اهتماهن بأوقات الفراغ أكثر من قبل. وأن (93.9%) من المبحوثات أكدن أن الالتحاق بإحدى برامج محو الأمية أدى إلى اهتمامهن بنظافة المحيط أكثر من قبل. وأوصت الدراسة بـضرورة متابعة تعليم الأمي أمر مهم في التخلص من الأمية، وعدم حدوث انتكاسة لدى من ساهمت الدولة في محو أميتهم وعودتهم أميين، فالفرد الذي تمحى أميته قد يعود أميا مرة أخرى إذا لم توجد البرامج التي تساعد على استمرار تعلمه.
Peranan Roh Kudus sebagai Pembimbing kepada Kebenaran Allah: Refleksi Atas Kerohanian Hidup Sehari-Hari
Authors: Balqies Anggreq Venita
Published: February 2024

Konsep mengenai kebenaran Allah merupakan salah satu topik yang sangat penting dan menarik bagi orang Kristen karena topik ini berkaitan dengan bagaimana Allah menjadi sumber dan standar dari segala kebenaran. Peranan roh kudus dalam kehidupan orang percaya bisa dilihat melalui perubahan yang terjadi dalam kehidupan orang tersebut sehingga bisa menjadi pribadi yang memberkati orang yang ada di sekitarnya. Dalam kehidupan sehari-hari orang Kristen sering kali tidak menggambarkan identitas kekristenan. Hal tersebut terbukti dari cara hidup yang tidak selaras dengan kebenaran Firman Tuhan. Cara hidup yang tidak selaras dengan kebenaran Firman Tuhan tentunya menjadi bukti bahwa orang percaya memerlukan peranan Roh Kudus dalam kehidupan sehari-hari. Oleh karena itu, artikel ini dituliskan dengan tujuan untuk membahas mengenai peranan Roh Kudus sebagai penuntun kepada kebenaran Allah sehubungan dengan kerohanian hidup sehari-hari. Penelitian ini menggunakan metode penelitian literatur atau kepustakaan. Dalam metode ini peneliti mengumpulkan, menganalisis, dan menginterpretasi informasi dari berbagai sumber literatur yang relevan dengan topik penelitian. Dari hasil penelitian tersebut maka dapat disimpulkan bahwa, Roh Kudus memiliki peran yang sangat penting dalam kehidupan orang Kristen. Dalam hidup sehari-hari, Roh Kudus mempengaruhi tindakan manusia melalui beberapa cara, seperti mengubah sifat manusia, memberikan karunia-karunia rohani, membimbing orang Kristen dalam mengambil keputusan yang benar, menguduskan orang percaya, dan mengubah pikiran manusia.