bluuebunny/crossref_metadata_2025 huggingface dataset:
Assessing Climate-Induced Vegetation Dynamics in the Kullu Valley Watershed, Western Himalayas, through Remote Sensing and Machine Learning: Statistical Analysis spanning 2000–2020
Authors: Kashyap Akash , Kumar Ashwani
Published: May 2024

The dynamics of vegetation are critical for identifying climate change trends. The current study aims to examine the spatio-temporal changes in vegetation cover in the Kullu valley (Western Himalaya) during the decadal 2000, 2010, and 2020. The objective of the study includes the computation of normalized difference vegetation index (NDVI) vegetation spectral indices, the extraction of various classes of vegetation, and statistical analysis of the sequential Mann Kendall test and Mann-Kendall (MK) test on historical metrological data from the study site (specifically precipitation, relative humidity, and temperature). Power data access viewer (NASA) datasets have been used in the statistical analysis of climatological data. The primary feature classes in the study are forest cover, snow, river, and grassland/scrubland. The result indicated that the region's grassland cover declined by 120.57 km2 and its forest cover decreased by 40.6 km2 between 2000 and 2020. The results demonstrate that climatic variables like slopes and increased minimum temperatures by two meters (A), minimum temperatures (B), maximum temperatures (C), relative humidity (D), and annual mean precipitation (E) from 2000-2020 are the main factors limiting vegetation growth. The determined NDVI displays significant variations across the study area. The annual maximum temperature was falling. The study's objectives are to: 1) analyse the spatiotemporal variation of vegetation cover, 2) identify its primary drivers, and 3) examine statistical trends in long-term metrological data. The result of the research presented will be useful in properly managing and monitoring the forest ecosystem.
RETRACTED: Experimental study on the regulation of M1/M2 macrophage polarisation to improve atherosclerosis by Strengthening the Jian-Pi-Qu-Tan Formula
Authors: Han Xiaomeng , Liu Yue , Zhao Yu , Tan Mi , Yu Maosheng , Li ZiWei
Published: May 2024

The authors have requested that this preprint be removed from Research Square.
Effects of Nutritional Interventions on Metabolic Syndrome Parameters Among Employees in Higher Education
Authors: Požar Hajnalka , Šumonja Sanja , Sabo Nataša Čamprag , Sekulić Nataša , Puškaš Valentin , Požar Čaba
Published: May 2024

The aim of this study is to assess the prevalence of metabolic syndrome parameters among the working population, as well as the change in these parameters after the implementation of nutritional interventions. The research was conducted as a prospective, longitudinal, quasi-experimental evaluation study from May to December 2022. The research sample consisted of employees at the College of Vocational Studies for the Education of Teachers and Sports Coaches in Subotica. The study lasted in three phases: 1. initial measurements (eating habits, anthropometric and biochemical measurements), 2. nutritional interventions (counseling work) and 3. evaluation (four months after the initial assessment). Data analysis included methods of descriptive statistical analysis. Nutritional intervention was conducted for 30 participants. Only 18 employees responded to the evaluation. Two thirds (62%) of the participants were overweight. Elevated cholesterol levels were found in almost two-thirds of the participants. Elevated triglyceride values were registered in more than half of the participants. Hyperglycemia was identified in 13% of participants. The research showed that over a third of the participants had three or four risk factors for the development of metabolic syndrome. The results of this study confirm the high prevalence of metabolic syndrome risk factors in the working age population.
The first successful land-based larviculture of narrow-barred Spanish mackerel (Scomberomorus commerson) and the assessment of optimal water conditions for larval survival using response surface methodology
Authors: Chiu Pei-Sheng , Chu Yeong-Torng , Lee Yen-Hong , Chang Ting-Jeng , Chang Che-Cheng , Hseu Jinn-Rong , He Jia-Sin , Weng Jinn-Shing , Wu Feng-Cheng
Published: May 2024

The narrow-barred Spanish mackerel, Scomberomorus commerson, is a high economic value fishery resource in various parts of the world including Taiwan, but its population has significantly declined in recent years. Developing aquaculture methods for this species could help counteract the dwindling fisheries resources. This study successfully achieved fertilization through onboard artificial insemination, optimized larval survival conditions using response surface methodology (RSM), and conducted two batches of larviculture in land-based ponds while tracking larval development. Artificial insemination was performed on April 18, 2023, and May 12, 2023, aboard a vessel, resulting in fertilization rates ranging from 90–100%. Fertilized egg diameter was 1.04 ± 0.01 mm, with an oil globule diameter of 0.30 ± 0.00 mm. Optimal larval survival conditions, determined using RSM, were found at 25.17°C and 26.54 ppt salinity, achieving a larval survival of 97.42% with a desirability value of 0.974. Larvae began feeding at 3 days post hatch (dph), measuring 3.57 ± 0.07 mm, and grew to 117.91 ± 16.18 mm by 37 dph. Survival rates for the two batches ranged from 0.17–0.23%. This study represents the successful larviculture of narrow-barred Spanish mackerel in land-based culture ponds, marking a significant advancement in aquaculture for this species.
Non-linear λ−jordan Triple∗−derivation on Prime ∗−algebras
Authors: Kaheshzad Shuja , Rahnaward Ahmad ramin , Rahimi Sebghatollah
Published: May 2024

Let $\mathcal{A}$ be a prime $\ast-$algebra and $\Phi$ a $\lambda-$Jurdan triple derivation on A, that is, for every $A, B, C \in \mathcal{A}$, $\Phi(A\diamond B)=\Phi(A)\diamond B+ A\diamond\Phi(B)$ wher $A\diamond_\lambda B = AB^\ast +\lambda BA$ such that a real scalar $|\lambda|\ne 0, 1,$ and $\Phi$ is additive. moreover, if $\Phi(I)$ and $\Phi(il)$ are selfadjiont then $\Phi$ is a $\ast-$derivation.
Optimal Sizing and Design of a Photovoltaic-Wind-Fuel Cell Storage System Using Zebra Optimization Algorithm
Authors: Said Mokhtar , Gad Doaa A. , El-Gaafary Ahmed , Elbaset Adel , Morad Mohamed
Published: May 2024

An optimum design of Photovoltaic-wind turbine-fuel cell hybrid energy systems (HRES) linked to a stand-alone micro-grid to meet the energy requirements of industrial and residential buildings in the Egyptian city of Siwa with anew algorithm introduced in this paper. The main photovoltaic (PV) and wind turbine (WT) hybrid renewable energy systems (HRESs) provide an affordable means of distributing power in these areas and then there is surplus power, it is efficiently channeled towards the electrolyzer to produce hydrogen. When the generated power cannot provide sufficient power, stored hydrogen is furnished to a proton exchange membrane fuel cell which, smoothly and without interruption, supplies the load. Fuel cells serve as supplemental sources intended to balance out power fluctuations and provide a steady supply of electricity to the load. The Zebra algorithm (ZOA) is used to determine the hybrid system's ideal size and compare results with Cuckoo Search algorithm (CSA). To match the load of the site with high operational reliability, a fitness function is employed loss of power supply probability (LPSP). To have a high-performance, dependable system, the optimization problem's choice variables such as the quantity of PV arrays and WTs are optimized. Based on the findings, 150 FCs, 113 wind turbines, and 82 PV arrays make up the ideal HRES system. The optimization performance has been excellent, even when the unmet load is zero with lowest COE.
Antioxidant and antinutritional potentials of sweet potato (Ipomoea batatas) leaf meal on blood indices, carcass characteristics and histopathology of broiler chickens
Authors: obakanurhe oghenebrorhie , Irikefe-Ekeke Efe Peterson , Moemeka Adimabua Mike , Onwumelu Ifeoma Jane , Sanubi Oghenenyerhovwo Jovita
Published: May 2024

A feed trial on seven hundred- and twenty-day old Cobb-500 strain broilers finisher chickens on substituting sweet potato leaf meal (SPLM) in broiler chicken diets was conducted. In a completely randomized design, the birds were allocated randomly to five (5) diets with 144 birds per treatment and divided into four replicates of thirty-six birds each. Treatment 1 was designated as the control (0% SPLM) while 3.75% SPLM, 7.5% SPLM, 11.25% SPLM and 15% SPLM serve as T2 – T5 respectively. Data were collected on blood indices, carcass characteristics and histopathology which were subjected to analysis of variance (ANOVA) and the means were separated using Duncan’s Multiple Range Test. The proximate analysis and phytochemicals in the leaf revealed significant amounts of constituents analysed. The birds blood indices, carcass and organs characteristics on experimental diets recorded significant (p > 0.05) effects on WBC, MCH, MCV, glucose and total cholesterol, live weight, plucked weight and dressed carcass weight values. Treatment 3 had superior carcass values in comparison to the other treatments. The histopathology results recorded significant (p > 0.05) effects at 15%SPLM on the heart and liver respectively but no tissue damage was recorded. Birds on 11.25kg and 15kg SPLM supplemented diets had higher levels of superoxide dismutase and glutathione peroxidase (p 0.05) compared to other diets. Also, birds on SPLM supplements showed (p < 0.05) compared to the control. Conclusively, T3 revealed better carcass quality while 15 kg SPLM diet lowers the serum cholesterol concentration, improves the serum superoxide dismutase and glutathione peroxidase activities of the chickens, and lowers the cholesterol in the meat.
Natural and mixed convection cooling evaluation of a hybrid photovoltaic inverter
Authors: Heckler Otávio Duarte Aires , Annunziato Rafael Christiano , Desan Welington Fernando Lima , Pereira Marcus Vinicius Alves , Souza Jeferson Avila
Published: May 2024

Temperature control of embedded systems have become a key factor for the design of more thermal efficient electronic devices. They are becoming smaller and more powerful, what results in a large heat dissipation which must be removed from the system. Heat sinks and forced convection are the usual alternatives used to keep components temperature bellow critical values. In this work, a commercial hybrid photovoltaic inverter is numerically simulated and its thermal behavior is investigated for natural, forced and mixed flow conditions. Experimental results, for a forced convection case, were also reported and used do verify the numerical results. The 3D model accounts for all equipment with high heat dissipation and most of the less important (for thermal analysis) electronic devices, as well as, the fluid regions. A finite volume solution is obtained using the OpenFOAM software, more specifically the chtMultiRegionFoam solver. Flow modeling uses the Boussinesq approximation to account for the natural convection effects, while the k-e formulation was used to close the turbulence model. Results have shown that with current computational capacity, such complex systems (in terms of geometry) can be modeled with just a few simplifications. The inverter could work using only natural convection to cool down the system, however the operating temperatures would be close to the limiting values. In terms of forced convection, it is highlighted the importance of the correct design for the cooling system, avoiding oversizing the overall systems.
An analysis of the Decomposition and driving force of carbon emissions in transport sector in China
Authors: Gu Jing , Jiang Shuhua , Zhang Jing , Jiang Jinde
Published: May 2024

China's transport carbon emissions are increasing quickly and the issue of emission reduction is urgent. This article aims to calculate and decompose China’s transport carbon emissions during 2001–2019. It first measures the China's transport carbon emissions by IPCC carbon emission factor method, and then applys the Logarithmic Mean Divisia Index (LMDI) model for decomposition analysis. The conclusion indicates that: 1) Diesel, gasoline, kerosene, and fuel oil are the major energy sources used in China's transport sector, with the combined consumption of diesel and gasoline exceeding 70%, and the annual growth rate of energy consumption reached 8.92% during 2000–2019. Among them, natural gas and liquefied petroleum gas (LPG) have the fastest growth rate, while the only one showing a downward trend is raw coal, indicating that China's transportation energy structure is being optimized. 2) Although China's transport carbon emissions have been increasing, the growth rate has declined since 2013. The proportion of carbon emissions from kerosene, diesel, natural gas, and LPG increased from 2000 to 2019, while that of raw coal, gasoline, and fuel oil decreased. This suggests that the use of clean energy, air transportation, and large-scale transportation is increasing, while the use of heavily polluting fuels and small-scale road transportation is decreasing. 3) Per capita GDP is the driving factor that has the most influence on the increase of China’s transport carbon emissions. Population positively influences transportation carbon emissions too, but issues such as aging, low fertility rates, and insufficient labor force may change the direction of the impact in the next 30 years. 4) The negative effect of energy intensity on transport carbon emissions is the greatest, followed by industrial structure and energy structure. The development of highways, new energy vehicles, railway electrification, multimodal transportation, third-party logistics, and logistics information technology in China has improved the energy structure, reduced energy intensity, and brought China's transport sector into an important stage of innovation driven and pursuit of coordinated development with the environment.
Does the health condition of the common ash tree affect its pollen viability?
Authors: Kahlenberg Georgia , Buchner Lisa , Jochner-Oette Susanne , Eisen Anna-Katharina
Published: May 2024

Pollen viability plays a crucial role in reproduction. Given the enormous threat posed to the common ash (Fraxinus excelsior L.) by ash dieback, it is important to investigate the disease's effects on pollen viability and germination. Thus, we conducted an analysis of these pollen characteristics across three distinct forest stands in southern Bavaria, with a maximum of 23 ash trees per study site. These ash trees exhibited varying degrees of ash dieback-related damage symptoms, enabling us to assess differences between mildly and severely affected trees (via Mann-Whitney-U/Wilcoxon test). Pollen viability was assessed using the TTC test, while pollen germination capacity was evaluated using a sucrose agar solution. Our findings revealed no significant differences in pollen viability between healthy and diseased trees, as indicated by both the TTC test and pollen germination assay. However, a tendency towards higher pollen viability was observed in healthier, more robust ash trees across both methods. Non-significant differences, however, suggest that ash trees can produce viable pollen necessary for successful fertilisation irrespective of their health status. Nonetheless, it was observed that severely diseased trees were linked to less inflorescences, as the severely diseased or dead shoots produced few to no flowers. Consequently, the likelihood of pollen from severely diseased trees fertilising other ash trees is substantially diminished. In conclusion, it is evident that flower and pollen production are most important in the reproductive ecology of ash trees.
Potential use of different organic fertilizers in lettuce cultivation
Authors: Tütüncü Aslıhan Çilingir , SAKA Andaç Kutay , AY Abdurrahman , Özer Mehtap Özbakır , YILMAZ Hakan , OZER Harun
Published: May 2024

Background: This study aimed to determine the effects of different organic fertilizers on organic lettuce cultivation in greenhouses under ecological conditions in the Samsun province of Türkiye. Three different organic fertilizers (compost solution, nettle solution and wood ash solution) were experimented with as an alternative to chemical fertilizers. A control treatment without any fertilizers was also included.
Results: Wood ash solution and nettle extract treatments significantly increased soil and plant nutrients. The highest SSC (3.8%) and vitamin C (61 mg 100g-1) values were determined in the nettle solution, while the highest total phenolic (1650 g GAE kg-1 fw) and total flavonoids (408 g QE kg-1 fw) values were determined in the compost solution. The highest yield was obtained from wood ash solution treatments (6169 kg da-1).
Conclusions: The results showed that nettle extract and wood ash solution could provide effective fertilizers to achieve high yield and quality in organic lettuce cultivation. It is recommended to investigate combinations of nettle and wood ash solutions in different proportions for edible leafy species.
Infrared Neuroglial Modulation of spinal locomotor networks
Authors: Dumas Nathan , Pecchi Emilie , O'Connor Rodney P. , Bos Rémi , Moreau David R.
Published: May 2024

Infrared neural stimulation (INS) emerges as a promising tool for stimulating the nervous system by its high spatial precision and absence of the use of exogenous agents into the tissue, which led to the first successful proof of concept in human brain. While neural networks have been the focal point of INS research, this technique is also non cell type specific as it triggers activity in non electrically excitable cells. Despite increasing interest, there remains to demonstrate well defined simultaneous astrocytic and neuronal signals in response to INS. Using intravital calcium imaging, we show that INS has the capacity to initiate calcium signaling in both astrocytes and neurons simultaneously from the rostral lumbar spinal cord, each exhibiting distinct temporal and amplitude characteristics. Importantly, the mechanism underlying infrared-induced neuronal and astrocytic calcium signaling differ, with neuronal activity relying on sodium channels, whereas induced astrocytic signaling is predominantly influenced by extracellular calcium and TRPV4 channels. Furthermore, our findings demonstrate the frequency shift of neuronal calcium oscillations through infrared stimulation. By deepening our understanding in INS fundamentals, this technique holds great promise for advancing neuroscience, deepening our understanding of pathologies, and potentially paving the way for future clinical applications.
Language-guided Object Classification Via Neuromorphic Vision
Authors: Huang Xiaoqian , Sajwani Hussain , Hay Oussama Abdul , Zweiri Yahya
Published: May 2024

Through training on large-scale image-text pairs, vision-language models (VLMs) have gained the ability to align visual information with semantic understanding using natural language, thus leading to better performance on downstream tasks on unseen data. Due to a lack of large-scale neuromorphic vision datasets that also include natural language, training with large-scale datasets to achieve generalized understanding is not feasible. Therefore, this work introduces a neuromorphic adapter neural network that leverages CLIP-based semantic understanding with neuromorphic-inspired feature extraction, thereby enhancing the robustness and efficiency of object classification in real-world scenarios. Specifically, by incorporating the temporal information of neuromorphic vision and the multimodal strengths of CLIP, our approach excels in few-shot learning, effectively extending comprehension across object classification tasks. We evaluate our approach on three public datasets: N-Cars, N-Caltech, and N-ImageNet, yielding encouraging classification accuracy after few-shot learning compared to the state-of-the-art models. Moreover, compared to zero-shot inference, our approach achieves +9.92%, +33.65%, and +42.63% improvements under 1-shot, 15-shot, and 20-shot settings in classification accuracy, respectively. Consequently, it demonstrates the effectiveness of adapting pre-trained language-vision models for event data, enabling effective learning and inference even with limited annotated data.
Hybrid Robotic System (Robo - HEX) for Robot-Assisted Pilon Fracture Reduction
Authors: Aubakirova Sabina , Zhanaspayev Marat , Azamatov Bagdat , Muzdybayev Murat , Tlemissov Aidos , Dmitriev Nikolay , Mussabekov Arman , Prokazyuk Alexander
Published: May 2024

Intra-articular fractures of the distal tibia are complex with a high risk of complications before and after surgical treatment. Tibial pilon fractures are rare but present a serious challenge for orthopedic surgeons. There is still no universally accepted treatment protocol for pilon fracture. In traditional, the reduction of fractures has some drawbacks such as the risk of infection, low accuracy, and high radiation for surgeons. Particularly complex intra-articular fractures require a lot of force. To solve such problems, a detachable hybrid robotic system has been developed that combines a detachable parallel mechanism with a drive mode. This article describes the mechanism in detail, analyses the method of fracture reduction, presents the surgical manipulation, and verifies the reduction by experiments with bone models. The article presents the results of research to solve problems of pilon fracture management.
Factors associated with Violence against Homeless People: cross-sectional study in Sorocaba/2023
Authors: Gianini Reinaldo José , Martuscelli-Neto Abel Efraim , Villena Kathleen Vilarim
Published: May 2024

The problem of homelessness (PSR) has been the subject of discussion in various spheres of public policy given its complexity and the need for intervention from different sectors. Analyze the factors associated with the types and perpetrators of violence against PSR, with special attention to drug use, social and demographic variables, variables related to homelessness and to health is very important. This research refers to the PSR present in the Municipality of Sorocaba.The interviews were carried out from August 2022 to July 2023, in places known to be frequented by PSR. This is a cross-sectional study, with 84 individuals. Data collection took place through interviews using a standardized questionnaire. This project was submitted and approved by the Research Ethics Committee of the Faculty of Medical Sciences of Sorocaba. The results of the present study show high rates of drug use in PSR, with crack users presenting a more critical profile: irregular eating habits, history of arrest, history of psychiatric hospitalization, reports of various mental health problems, and non-adherence to prevention measures. The prevalence of reported morbidity and psychiatric hospitalizations are relevant in the sample. Victimization due to physical violence, which is predominantly carried out by the police and mainly involves cocaine and crack users, is another aspect that deserves attention. The results showed that drug use is the main factor complicating access to health in PSR, being the main reason for loss of housing, with family conflicts predominating as responsible for the homeless situation of the individuals in the research.
Defluorinative Functionalization Approach led by Difluoromethyl Anion Chemistry
Authors: Nagaki Aiichiro , Muta Kensuke , Okamoto Kazuhiro , Nakayama Hiroki , Wada Shuto
Published: May 2024

Organofluorine compounds have greatly benefited the pharmaceutical, agrochemical, and materials sectors. However, they are plagued by concerns associated with PFAS. Additionally, the widespread use of the trifluoromethyl group is facing imminent regulatory scrutiny. Defluorinative functionalization, which converts the trifluoromethyl to the difluoromethyl motifs, represents the most efficient synthetic strategy. However, general methods for robust C(sp3)–F bond transformations remain elusive due to challenges in selectivity and functional group tolerance. Here, we present a method for C(sp3)–F bond defluorinative functionalization of the trifluoromethyl group via difluoromethyl anion in flow. This new approach tames the reactive difluoromethyl anion, enabling diverse functional group transformations. Our methodology offers a versatile platform for drug and agrochemical discovery, overcoming the limitations associated with fluorinated motifs.
Çalışma Ortamında Çalışma Refahı Farkındalığını Artırma ve Strateji Geliştirme Üzerine Bir Araştırma
Authors: Yaşar Emre , Özfırat Muharrem Kemal
Published: May 2024

“İş yerinde refah” terimi, yıllar içerisinde literatürde yaygın olarak kullanılmaktadır ve hem işçilerin sağlığı hem de işin verimliliği ve karlılığı açısından çok etkili olduğu konusunda geniş bir tanı vardır. İşyeri Refahı; çalışma ortamının, fiziksel ortamın kalitesi ve güvenliğinden, çalışanların işlerini nasıl hissettikleri, çalışma ortamları, çalışma ortamı ve iş organizasyonu ile ilgili tüm yönleriyle ilgilidir. İşyerinde refah için alınacak önlemlerin amacı, işçilerin güvenli, sağlıklı, memnun ve iş ile meşgul olmalarını sağlamak için İSG önlemlerini tamamlamaktır. Bu çalışmanın amacı, petrokimya ürünleri üreten bir fabrikada çalışan işçilere yönelik çalışma refahı ile ilgili farkındalığı arttırmak amacıyla yapılmıştır. İzmir ili Aliağa ilçesinde bulunan petrokimya üreten fabrikada çalışan tüm beyaz yakalı çalışanların evreni temsil ettiği varsayılmaktadır. Araştırmada veriler görüşme formunda bulunan soruların cevaplandırılmasıyla toplanmıştır. Çalışanların bu sorulara doğru cevap verdiği varsayılmıştır. Toplam 50 kişi ile çalışma tamamlanmıştır. Yapılan çalışma sonucunda odaklanılması gereken en önemli üç çalışma refahı konusu sırasıyla stres (%45,5), ergonomi (%37,3) ve sağlıklı çalışma ortamı (%31) olarak tespit edilmiştir.
Kum Bentonit Karışımında Sızıntı Suyunun Hidrolik İletkenliğe Etkisi
Authors: Durukan Seda
Published: May 2024

Bu çalışmada düzenli atık depolama sahaları altında geçirimsiz tabaka olarak da kullanılan kum-bentonit karışımlarının sızıntı suyu karşısındaki geçirimsizlik davranışı incelenmiştir. Bu amaçla kum-bentonit karışımı içerisinden sızıntı suyunun geçirildiği esnek duvarlı hidrolik iletkenlik deneyine tabi tutulmuştur. Literatürde genel olarak musluk suyu ya da yapay kirleticiler ile gerçekleştirilen hidrolik iletkenlik deneyleri, bu çalışmada orijinal sızıntı suyu ile gerçekleştirilmiştir. Sızıntı suyu olarak da Ege Bölgesinden seçilen bir katı atık depolama sahasından elde edilen sızıntı suları kullanılmıştır. Kum-bentonit karışımının oranı kuru ağırlıkça %10 bentonit içerecek şekilde hazırlanmıştır. Deney esnasında sızıntı suyunun giriş ve çıkış sıvılarının bazı kimyasal analizleri de gerçekleştirilmiştir. Ölçülen hidrolik iletkenlik değerlerinin sınır koşullara yakın olmak kaydı ile, kriterleri sağladığı belirlenmiştir. Bununla beraber, musluk suyu sonuçlarına göre artış görüldüğü de dikkati çekmiştir. Ortam pH’ı tüm deneylerde bazik olarak ölçülmüştür. Sızıntı suyuna ait giriş sıvısının elektriksel iletkenliğinin, tüm örneklerin çıkış sıvılarının elektriksel iletkenliğine oranı 1’in altında kalmıştır. Bu durum deneyin sonlandırıldığı anda katyon değişimlerinin sonlanmadığını işaret etmektedir. Son olarak da giriş ve çıkış sıvılarındaki bazı alkali ve toprak alkali metali iyonlarındaki değişimler ölçülmüş, karışımdaki kilin sızıntı suyu maruziyeti altında mineral yapısındaki değişimler belirlenmiş ve hidrolik iletkenliğe etkisi de tartışılarak sunulmuştur.
Fatigue Properties of Zinc Coated Low Carbon Steel Sheet Joints by the Means of Spot Welding
Authors: Çetkin Ahmet
Published: May 2024

EN 10346:2015 DX52D+Z steel is a low-carbon, zinc-coated steel suitable for cold forming, widely used in the automotive industry due to its superior formability despite its low strength. Sheets produced in different sizes and forms are annealed by passing through the continuous galvanizing line after cold rolling. In this study, fatigue properties of these steels which were joined by spot welding with low welding current and high welding cycles, were measured and failure characterization was made, too. Tensile testing was made using a number of lap joints with different parameters and the variation of hardness within the weld area was also investigated. During the fatigue testing, crack initiation and propagation have been experimentally determined. A significant increase in hardness was observed from the base metal to the weld nugget, and the welding process caused a 38% reduction in the strength of the base material due to the heat affect from the joint. In the microhardness test, the highest hardness value was measured in the weld nugget heat affected zone (228.4 HV), and the hardness of the base metal was 169.4 HV. It has been determined that welded joints have infinite life below approximately 20% of the maximum tensile load.
Mapeamento Tomográfico de Pacientes com Fratura da Extremidade Distal do Rádio
Authors: Paladini-Filho Paulo Henrique , Junqueira Laura Machado Barbosa , Tanaka Marcel Teiitiro Sugohara , Gimenes Felipe Gonzales , Reis Alisson Augusto Muraro dos , Serrano Sara Dadona Correia , Rezende Luis Guilherme Rosifini Alves
Published: May 2024

Introdução. A fratura da extremidade distal do rádio é uma das fraturas mais comuns nos atendimentos hospitalares. Apresenta diferentes padrões de acordo com a faixa etária, sexo e energia do trauma, conferindo o aspecto bimodal epidemiológico. Fraturas da extremidade distal do rádio cominuídas apresentam maior complexidade, modificando o tipo de tratamento e prognóstico dos pacientes. O objetivo deste estudo é realizar o mapeamento tomográfico das fraturas articulares do rádio distal. Métodos. Estudo retrospectivo, baseado na revisão de prontuários e de exames de imagens disponíveis de pacientes submetidos a tratamento cirúrgico de fraturas da extremidade distal do rádio em um hospital terciário. As cominuições foram divididas em tipos de acordo a Classificação de Medoff. Resultados: A cominuição tipo 1 ocorreu em 45,8% dos casos, a tipo 2 em 79,2%, a tipo 3 em 16,7%, a tipo 4 em 31,3% e a cominuição tipo 5 em 93,8% das fraturas. Houve diferença estatística para sexo feminino e cominuição por impacção no fragmento central (p=0,009; teste do Qui-Quadrado). Conclusão: a compreensão biomecânica dos traços ou linhas articulares das fraturas do rádio distal e seus principais desvios apresentaram diferença estatística para cominuição no fragmento de impacção central em mulheres, contudo nosso estudo não foi capaz de explicar a relação entre cominuições na coluna radial e alterações na articulação radioulnar distal.
Developing a software for the analysis of METOC impact on the planning process of the maritime operations
Authors:   Mircea cel Batran Naval Academy, Atodiresei D.
Published: May 2024

Few military operations, including those of our enemies, are immune to the influence of the environment. To give the commander knowledge about the elements of the operational environment and the capability to utilize them to obtain a tactical advantage during military missions, meteorological and oceanographic (METOC) support is crucial. The next project involves creating a software that serves as an effective means of compiling METOC reports from the North-West Black Sea provided by Maritime Hydrographic Directorate in order to determine the impact of meteorological and oceanographic aspects on the maritime operations.
Creation of Scenarios with VSTEP Simulator and Evaluation of Simulators Use in Maritime Education and Training
Authors:   Nikola Vaptsarov Naval Academy, Nikolova M.
Published: May 2024

The aim of this paper is to present created scenarios for training crews on the VSTEP simulator and to analyze the results of a survey conducted on the effectiveness of the education in relation to the future realization of the trainees. Two scenarios developed on the VSTEP simulator are presented in this paper. The first scenario aims at the vessel reaching a certain point of the Bоurgas environment and dropping anchor there. The second scenario is about maneuvering two vessels in the Atlantic Ocean under ideal weather conditions. A survey was conducted with cadets and students related to the training of VSTEP navigation simulators at the Nikola Vaptsarov Naval Academy. Conclusions are drawn about the quality of training on the simulators, the level of teaching and the practical skills the trainees acquire at the Nikola Vaptsarov Naval Academy.
Face extraction and clustering with Viola - Jones object detection framework and T-SNE dimensionality reduction
Authors:   Titu Maiorescu University, Milutinovici S.
Published: May 2024

We investigate the possibility to use Viola-Jones [1] object detection framework through a multi-model approach to build a face extraction pipeline that will be used in video appearance tagging. Although deep convolutional neural networks have surpassed previous algorithms in performance [2], Haar Cascades needs much lower memory than CNN, does not require specialized hardware, and has lower storage requirements. Most videos will show the same face more than once, at least a few close-ups that are full frontal and well lit. We need an efficient system that will extract the best appearances. This study shows the pre-trained model selection, the fine-tuning of run-time parameters and the test. After selection of models for faces, eyes, mouths and noses and testing the right runtime parameters we were able to establish a procedure that will avoid any false positives and will produce a set of well defined faces.tart your abstract here
Characterization of the network of a transport infrastructure
Authors:   Mircea cel Batran Naval Academy, Răpeanu E.
Published: May 2024

Networks (whatever their nature: telecommunications, freight transport, energy or people) are studied from several points of view, they have a fundamental role in the existence of the territory as well as in its development. The transport networks are of great diversity depending on the mode of transport to which they belong. The transport infrastructure network is characterized by arcs and nodes. Both arcs and nodes have characteristics that must be connected to the means of transport that use it. In order to carry out the transport in the relationship (𝑖,𝑗) ∈ 𝑅 for a given network (𝐾,𝐷), the sequence of arcs connecting to node 𝑖 ∈ 𝐾 to the node 𝑗 ∈ 𝐾 must be chosen (in the case of the network appropriate to the request). If the nodes 𝑖,𝑗 are neighbors the arc will constitute the shortest sequence of arcs.
TEMPEST vs Commercial Equipment
Authors:   Mircea cel Batran Naval Academy, Păiuș C.
Published: May 2024

When one thinks about TEMPEST and compromising electromagnetic emissions, he might think that everything is possible only with the help of sophisticated and expensive dedicated field equipment. Due to the technological evolution and the appearance of small and affordable broadband receivers with notable capabilities, the analysis of compromising electromagnetic emissions has become much easier to achieve but also led to an increased risk in terms of information security.
Physical and unphysical regimes of self-consistent many-body perturbation theory
Authors: Van Houcke Kris , Kozik Evgeny , Rossi Riccardo , Deng Youjin , Werner Félix
Published: May 2024

In the standard framework of self-consistent many-body perturbation theory, the skeleton series for the self-energy is truncated at a finite order N and plugged into the Dyson equation, which is then solved for the propagator G_NGN. We consider two examples of fermionic models, the Hubbard atom at half filling and its zero space-time dimensional simplified version. First, we show that G_NGN converges when N\to∞N→∞ to a limit G_∞\,G∞, which coincides with the exact physical propagator G_{exact}Gexact at small enough coupling, while G_∞ ≠ G_{exact}G∞≠Gexact at strong coupling. This follows from the findings of [Phys. Rev. Lett. 114, 156402 (2015)] and an additional subtle mathematical mechanism elucidated here. Second, we demonstrate that it is possible to discriminate between the G_∞=G_{exact}G∞=Gexact and G_∞≠G_{exact}G∞≠Gexact regimes thanks to a criterion which does not require the knowledge of G_{exact}Gexact, as proposed in [Phys. Rev. B 93, 161102 (2016)].
Reweighting Monte Carlo predictions and automated fragmentation variations in Pythia 8
Authors: Bierlich Christian , Ilten Philip , Menzo Tony , Mrenna Stephen , Szewc Manuel , Wilkinson Michael K. , Youssef Ahmed , Zupan Jure
Published: May 2024

This work reports on a method for uncertainty estimation in simulated collider-event predictions. The method is based on a Monte Carlo-veto algorithm, and extends previous work on uncertainty estimates in parton showers by including uncertainty estimates for the Lund string-fragmentation model. This method is advantageous from the perspective of simulation costs: a single ensemble of generated events can be reinterpreted as though it was obtained using a different set of input parameters, where each event now is accompanied with a corresponding weight. This allows for a robust exploration of the uncertainties arising from the choice of input model parameters, without the need to rerun full simulation pipelines for each input parameter choice. Such explorations are important when determining the sensitivities of precision physics measurements. Accompanying code is available at https://gitlab.com/uchep/mlhad-weights-validation.
Fermionic quantum computation with Cooper pair splitters
Authors: Vilkelis Kostas , Manesco Antonio L. R. , Torres Luna Juan Daniel , Miles Sebastian , Wimmer Michael , Akhmerov Anton R.
Published: May 2024

We propose a practical implementation of a universal quantum computer that uses local fermionic modes (LFM) rather than qubits. The device consists of quantum dots tunnel-coupled by a hybrid superconducting island and a tunable capacitive coupling between the dots. We show that coherent control of Cooper pair splitting, elastic cotunneling, and Coulomb interactions implements the universal set of quantum gates defined by Bravyi and Kitaev [Ann. Phys. 298, 210 (2002)]. Due to the similarity with charge qubits, we expect charge noise to be the main source of decoherence. For this reason, we also consider an alternative design where the quantum dots have tunable coupling to the superconductor. In this second device design, we show that there is a sweet spot for which the local fermionic modes are charge neutral, making the device insensitive to charge noise effects. Finally, we compare both designs and their experimental limitations and suggest future efforts to overcome them.
Conflicto armado y educación: una revisión usando Tree of Science
Authors: González Marín Yeraldine , Mejía Manrique Mauricio
Published: May 2024

El conflicto armado tiene un impacto negativo significativo en la calidad de la educación, lo que a su vez contribuye a su prolongación indefinida. La literatura académica actual sobre este tema está dispersa y fragmentada, lo que hace imperativa una revisión que integre estos aspectos y proporcione un panorama general junto con sus principales subcampos. El propósito de esta investigación es identificar los principales aportes académicos sobre el conflicto armado y la educación mediante el uso del algoritmo Tree of Science a partir de una búsqueda en Scopus. Los resultados revelaron tres áreas importantes. En primer lugar, se aborda la influencia de la educación emprendedora en zonas de conflicto. En segundo lugar, se discute sobre las emergencias históricas, y en tercer lugar, se analizan las inequidades políticas. Estos hallazgos pueden ser utilizados por los encargados de tomar decisiones para impulsar proyectos que promuevan la paz en las comunidades afectadas por el conflicto armado, a través del fomento de la educación.
Revisión documental de la satisfacción estudiantil respecto a la investigación formativa universitaria
Authors: Benavides Martínez Michel Dayanna , Torres Escobar Germán Andrés
Published: May 2024

El presente artículo busca caracterizar aquellos constructos de la investigación formativa virtual que contribuyen positivamente a la satisfacción estudiantil en universitarios. Metodológicamente, se llevó a cabo una investigación cualitativa de carácter documental en la que se revisaron artículos, tesis y bases de datos relacionadas con la investigación formativa en la educación virtual. Tras la revisión realizada, se encontraron algunas variables que influyen en la satisfacción estudiantil con la investigación formativa virtual, tales como: los conocimientos docentes de las TIC y de investigación, el acompañamiento docente permanente al estudiante, la integración de la gamificación en las actividades de investigación formativa y el uso de herramientas virtuales avanzadas en la enseñanza de la investigación formativa (laboratorios virtuales o simuladores, entre otras) que le permiten al estudiante aprender a investigar formativamente sin las limitaciones propias de una investigación real.
La creatio ex nihilo y las rationes seminalis en la cosmología agustiniana
Authors: Gil Calle Santiago de Jesús , Hernández Valencia Juan Sebastián
Published: May 2024

El pensamiento de san Agustín de Hipona reviste una carga especial en lo que se refiere a algunas consideraciones en torno a la explicación del origen del mundo, su creación, formación y consolidación. Por esta razón este artículo se propone indagar por los fundamentos ontológicos y filosóficos de la teoría agustiniana de la creación en dos momentos: a) el reconocimiento del significado de la creatio ex nihilo y ratios seminalis como conceptos neurálgicos en la teoría creacionista de san Agustín yb) el análisis de los mismos a la luz de dos momentos o sentidos identificados por él entorno a la narración de la creación: uno temporal y otro simultáneo. Recurriendo al Libro XII de las Confesiones y a algunos libros de De Genessi ad Literam se identifica que, aunque en principio san Agustín encuentre un problema de carácter narrativo entre ambos momentos, la introducción y fundamentación de los conceptos ya mencionados, le permite comprender la creación como un acto voluntario de Dios dado en un mismo momento (creación simultánea) expresado endos partes distintas, no en términos temporales, sino causales.
Los chicos “malos”: Callous Unemotional y agresión proactiva
Authors: Cardona Gutiérrez Cindy Vanessa , Carmona-Cardona César Andrés
Published: May 2024

El presente artículo, mediante una exposición narrativa, tiene como objetivo identificar la influencia de los rasgos de insensibilidad emocional o Callous Unemotional Traits (CU por sus siglas en inglés) en la agresión proactiva, con el propósito de analizar si hay una relación existente. Se recolecta la información por medio de material bibliográfico en revistas científicas de diferentes bases de datos, entre los años 2016 y 2022. Los resultados muestran que los rasgos CU presentan una correlación positiva, pero moderada con la agresión proactiva y reactiva; los altos rasgos psicopáticos en la infancia muestran una evolución desfavorable en la adolescencia, relacionándose con amigos antisociales, con consumo de drogas ilegales, demostrando un aumento significativo en la agresión proactiva, lo cual indica que los rasgos CU se correlacionan con la agresión proactiva. Para finalizar, las diferentes posturas entre los estudios plantean que se encontraron asociaciones válidas entre los rasgos CU y la agresión proactiva.
Cambios organizacionales implementados a partir del Covid-19 en un laboratorio químico de la ciudad de Medellín
Authors: Zapata Vásquez Cristian Orlando , Quintero Arango Luis Fernando
Published: May 2024

El presente estudio se realizó con el objetivo de conocer la influencia de los cambios organizacionales implementados en un laboratorio de la ciudad de Medellín generados por la pandemia del Covid 19, en aspectos organizacionales del orden administrativo y de estructura empresarial. El enfoque metodológico utilizado fue el cualitativo, el cual se desarrolló a partir del método de caso de estudio, que permitió sistematizar las experiencias de ocho colaboradores y dos directivos de un laboratorio de la ciudad de Medellín frente a los cambios organizacionales percibidos a partir de la pandemia por Covid 19, percepciones recolectadas mediante un grupo focal y de dos entrevistas semiestructuradas. Los resultados demuestran que los impactos organizacionales tienen una influencia directa en la productividad pues cada decisión tomada puede aumentar o disminuir la eficiencia de la empresa, así mismo, dichos cambios influyen sobre la satisfacción laboral, máxime cuando hay recortes de personal, pues esta situación puede alterar el ambiente laboral y fragmentar el sentido de pertenencia. Si se afecta la productividad y la satisfacción laboral, la competitividad se ve comprometida, situación que obliga a las organizaciones a revisar su gestión ante el cambio. Una de las conclusiones centrales del estudio indica que los cambios organizaciones tienen un efecto integral sobre las organizaciones, el cual, dependiendo del tipo de gestión que aplique la empresa, puede generar efectos positivos o negativos pues, de la gestión del cambio depende el curso del negocio, la estabilidad de los colaboradores, la eficiencia en los procesos y, en general, las cualidades competitivas de la organización.
Percepción de estudiantes universitarios latinoamericanos: educación antes y después de la pandemia
Authors: Ángel Gómez Karen , Arango Gallego Juan Mariano , García Lopera Isabela , Herrera Vélez Alejandra , Restrepo Camargo Yesenia , Rivera Montoya Yenni , Valencia Ochoa Juliana , Zapata Gómez Máredy Alexandra
Published: May 2024

La educación superior sufrió cambios en los años 2020 y 2021, los cuales se derivaron de las restricciones y confinamientos por la pandemia del COVID-19; las dinámicas de enseñanza-aprendizaje estuvieron obligadas a implementar el uso de mediaciones virtuales, lo que generó resistencia al cambio en algunos universitarios.El objetivo de este trabajo fue realizar un comparativo de las percepciones de estudiantes universitarios latinoamericanos sobre la educación superior antes y después de la pandemia. Se analizaron 3.000 comentarios de la red social Twitter. Se concluyó que, los comentarios de los estudiantes sobre la educación después de la pandemia son más positivos en comparación con los realizados durante la pandemia; los procesos educativos presenciales favorecen la real adquisición de aprendizajes vinculadas al contacto social a diferencia de la educación virtual.
Smart Solid Drug Delivery Systems: Exploring the pH Sensitivity of Cashew Gum‑Doxorubicin Prodrug
Authors: Ribeiro Irisvan , Leonardo Adisom , Carneiro Maria , Costa Filho Raimundo , Freire Rosemayre , Sousa Jeanlex , Araújo Gisele , Marinho Filho José , Araújo Ana , Paula Haroldo , Feitosa Judith , de Paula Regina
Published: May 2024

Polysaccharide-based prodrugs formed via pH-responsive covalent interactions can be used to prepare nanoparticles for drug delivery to tumor cells. This study reports the synthesis of cashew gum-doxorubicin prodrugs via Schiff base (CG-S-DOX) and amide bonds (CG-A-DOX), both of which exhibit pH-responsive behavior. Synthesis was confirmed using spectroscopic techniques. Drug-binding content and efficiency were higher for CG-S-DOX than for CG-A-DOX. The capacity of the nanoparticles to self-organize in aqueous media was confirmed using fluorescence spectroscopy, dynamic light scattering, and atomic force microscopy. Both prodrugs possessed sizes < 200 nm and showed responsive doxorubicin-release profiles in the acidic tumor cell microenvironment. Compared with free DOX, the CG-S-DOX and CG-A-DOX prodrug had significantly reduced cytotoxicity against non-tumor cells (L929). CG-S-DOX, but not CG-A-DOX, showed antitumor activity against HCT-116 (human colorectal cancer) and MCF-7 (human breast cancer) cells. An uptake assay confirmed that the nanoparticles were easily taken up by HCT-116 cells. These results together with the great reduction in cytotoxicity against non-tumor cells, confirm the potential of CG-S-DOX prodrug nanoparticles as a reliable and efficient system for the effective delivery of doxorubicin to tumor cells.