bluuebunny/crossref_metadata_2025 huggingface dataset:
Kerjasama Orang Tua Dan Guru Dalam Pembinaan Praktik Ibadah Harian Anak Berkebutuhan Khusus Di Sekolah Luar Biasa Negeri Pidie Jaya
Authors: A'liyah Nurul
Published: October 2023

Cooperation is an effort carried out together to achieve a goal, involving two or more parties. Cooperation in fostering the daily worship of students will also involve two parties, namely parents and teachers. The problem arising in this study lies in the cooperation of parents and teachers in fostering the daily worship practices of children with special needs at SLB Negeri (public special school) in Pidie Jaya, emerging inquiries such as the types of effort made by both parents and teachers, the form of cooperation that exists between the two parties, and the obstacles encountered in fostering the worship practices. The method used in this study was a qualitative research method with a descriptive analysis. Data collection techniques were observation, interview, and documentation. The results showed that both parents and teachers have made some efforts to help children with special needs practice prayers. The types of cooperation that the parents and teachers have performed included establishing communication by calling or writing notices in student books, organizing meetings, making correspondence to invite parents to school, and visiting students’ homes when necessary. The inhibiting factors for the cooperation between the parents and teachers were some parents’ unwillingness to attend the meetings and their lack of commitment to actively participate in working with the teachers in fostering their special-needs children.
Pendidikan Berbasis Lingkungan Pada Dayah Ummul Ayman 1 dan 2
Authors: Ruslan Ruslan
Published: October 2023

This thesis discusses environment-based education at Dayah (traditional Islamic board school) Ummul Ayman 1 and 2, especially on the planning and implementation of environmentbased education, and the obstacles faced during its implementation. In this thesis, the study used explorative research with the inductive approach. Data were collected by observation and interview. The results of the study indicated that the planning of environmentbased education at Dayah Ummul Ayman 1 and 2 had been implemented by the teachers. This was due to firm instructions from the leaders of both schools that all teachers pay attention to the environment-based education program incorporated in the learning process. The planning of the program was developed in the learning materials of the teachers. In addition, the implementation of the program was conducted in proper stages following the relevant situation and needs as well as deeply-rooted traditions in the schools, so that the program could be wellimplemented. On the other hand, the obstacles encountered during the program implementation in both schools were not particularly significant. However, in Dayah Ummul Ayman 2, some problems occurred related to the students’ discipline as well as the teachers’. Some teachers were found smoking, making some students follow suit, although they smoked outside the school environment.
DISTANCE TECHNOLOGIES IN THE EDUCATIONAL ENVIRONMENT DURING THE PANDEMIC: FEATURES OF PERCEPTION
Authors:   Central Russian Institute of Management, Branch of RANEPA, VOROBYEVA A.V. , VOLKOVA O.V. ,   Central Russian Institute of Management, Branch of RANEPA
Published: October 2023

The relevance and significance of digitalization of the educational process is caused by the need to adapt the education system. The article presents an analysis of the research of the Institute of Social Analysis and Forecasting of the RANEPA on the development of distance education in the conditions of coronavirus infection and the Department of Sociology and Social Technologies of the Central Russian Institute of Management – a branch of the RANEPA on the attitude of students to the use of distance technologies. The issues of digitalization of education during the pandemic, the attitude of teaching staff and students to the process of digitalization of education are considered. The purpose of the work is to identify the advantages and disadvantages of distance learning for the teaching staff and analyze the attitude of students to the use of distance technologies in the educational process.
CULTURAL POLICY AS A SECTORAL POLICY: LAPIDARY REFLECTIONS
Authors:   Academy of Civil Protection of the Ministry of Emergency Situations of Russia, KARPOVA G.G. , MELKOV S.A. ,   Academy of Civil Protection of the Ministry of Emergency Situations of Russia
Published: October 2023

The purpose of the study is to substantiate the belonging of cultural policy to the sector of sectoral policies in the modern Russian Federation. The article substantiates the existence of the problem of insufficient knowledge in the managerial-political science paradigm of such sectoral policy as cultural policy. The study was carried out using the methods of theoretical analysis and extrapolation. The paper proves that cultural policy in practice is sectoral in nature. Using a concrete example of the development of domestic cinema as a practical implementation of such an in-dustry policy as cultural policy, arguments are given in favor of studying and evaluating both managerial and economic aspects of state policy to support and develop the cultural sphere in us country.
Understanding the effect of the Succinonitrile additive and the electrode processing to enhance the performance of high voltage lithium-ion batteries using LiNi0.5Mn1.5O4 cathode
Authors: Nguyen Hieu , Truong Tuyen , Nguyen Quynh , Nguyen Hoang , Tran Man , Huynh Tuyen , Phung Quan , Le Loan Phung
Published: October 2023

The progressive improvement of lithium-ion batteries (LIBs) leads to
subsequent electrolyte design and electrode modification processes. The
spinel lithium nickel manganese oxide (LiNi0.5Mn1.5O4, LNMO) is one of
the potential candidates for the next generation of LIBs applied for
electric vehicles due to its high working potential (4.75 V vs. Li+/Li),
reasonable price, and environmental friendliness. Nevertheless, the
degradation of cycling performance at high potential induces massive
challenges for LNMO-based batteries commercialization. This study
investigated the impact of Succinonitrile (SN) and electrode processing
to strengthen and maximize the LNMO electrode and
graphite||LNMO full-cell performance. According to the
performance in half-cell, the sample contained 85 wt.% LNMO: 7.5 wt.%
C65: 7.5 wt.% PVDF/NMP combining with the electrolyte 1.5 M LiPF6 in
EC: EMC: DMC (2:1:7 – v/v) at 0.5 wt.% SN seems to be the optimal
condition for further full-cell. Indeed, the promising full-cell with
N/P=1.3 displays a remarkable initial capacity of 118.75 mAh.g-1 with a
Coulombic efficiency of 91.64%. Moreover, it maintains a capacity
retention of around 58% at the current density of 0.1C after 100
cycles.
Maternal gestational diabetes mellitus is associated with advanced bone age at peripubertal stage in female offspring: Taiwan birth panel study II
Authors: Chen Mei-Huei , Hsu Wen wei , Wei Chih-Fu , Tung Yi-Ching , Lin Ching-Chun , Lee Chien Nan , Chen Pau-Chung
Published: October 2023

Objective: This study aims to determine the impact of maternal
gestational diabetes mellitus (GDM) on peripubertal growth of offspring.
Design: Population-based prospective cohort study.
Setting: University Hospital. Population: 478
mother-offspring pairs from cohort Taiwan Birth Panel Study II (TBPS
II). Methods: Maternal GDM status was tested at gestational
weeks 24-28 using two-step or one-step oral glucose tolerance test.
Offspring received follow-up questionnaire, physical examination, and
bone age study at the age of 6 to 8. Associations between maternal GDM
and offspring outcomes were analyzed using multiple linear or logistic
regression models to adjust for maternal pre-gravid BMI, household
income, maternal age at delivery, and maternal menarche age.
Main Outcome Measures: Offspring bone age, serum sex hormone
levels, Tanner stage for breast and testes, and penile length.
Results: There were 43 (9.0%) children born from mothers with
GDM, and 435 (91.0%) in the control group. In girls, there was a more
advanced bone age in the GDM group (n=19) than the control group (n=203)
after adjusting for potential confounding factors (0.48-year, 95%
CI=0.002-0.97-year). For boys, the GDM group (n=24) showed no
advancement in the bone age compared with the control group (n=232)
(-0.13-year, 95% CI= -0.66-0.40). The serum sex hormone levels and
secondary sexual characteristics of children in the GDM group were
comparable to those in the control group. Conclusions: Girls
born from GDM mothers had more advanced bone age at peripubertal stage
than the control group. This phenomenon was not observed in boys, nor
were other secondary sexual characteristics and serum sex hormone
levels.
Pulmonary Function Tests in Infants Following SARS-CoV-2 Infection
Authors: Benenson-Weinberg Talia , Hevroni Avigdor , Boursheh Laurice S. , Breuer Oded
Published: October 2023

Introduction: The clinical spectrum of SARS-CoV-2 infection is
well-established. However, understanding its long-term implications,
especially in infants, remains limited. We aimed to evaluate pulmonary
function tests in infants (iPFT) several months after a documented
SARS-CoV-2 infection. Methods: An observational case-control
study was performed. iPFT results in infants with persistent respiratory
complaints several months after a SARS-CoV-2 infection were compared to
a registry of patients assessed at our center between 2008 and 2019
using the Mann–Whitney U and Fisher’s exact tests. Excluded from the
study were infants with chronic diseases and extreme prematurity.
Results: iPFT data from sixteen infants with respiratory
complaints and a history of SARS-CoV-2 infection and 475 controls were
evaluated in the study. The median time between the SARS-CoV-2 infection
and iPFT evaluation was 5.5 months (IQR=2.8-8.0). There were no
differences between cases and controls in clinical characteristics and
reason for iPFT evaluation. iPFT results showed no significant
differences between cases and controls in lung volumes, compliance, or
resistance. Expiratory airflow limitation was observed in both groups,
with better low lung volume flows in the SARS-CoV-2 group.
Categorization according to iPFT physiologic alteration and
bronchodilator responsiveness were similar in the two groups.
Conclusion: This study provides the first comprehensive iPFT
data in infants following a SARS-CoV-2 infection. The findings suggest
that SARS-CoV-2 infection does not cause unique long-term effects on
pulmonary function in infants with chronic respiratory symptoms. Further
studies in larger cohorts, particularly in infants with severe acute
SARS-CoV-2 infection, are warranted to validate these findings.
Ecosystem function associated with soil organic carbon declines with tropical dry forest degradation
Authors: Sosa Laura L. de , Carmona Inmaculada , Panettieri M. , Griffith Daniel M. , Espinosa Carlos I. , Jara-Guerrero Andrea , Plaza Cesar , Madejón Engracia
Published: October 2023

Forest degradation is increasingly recognized as a major threat to
global biodiversity and ecosystems’ capacity to provide ecosystem
services. This study examined the impacts of forest degradation on soil
quality and function in a seasonally dry tropical forest (SDTF) of
Ecuador. We compared soil physical-chemical properties, enzymatic
activity, particulate organic carbon (POC) and mineral-associated
organic carbon (MAOC) along a gradient of SDTF degradation in the dry
and rainy season. Our findings showed a consistent and steady reduction
in soil quality (total C and N) and function (dehydrogenase and
β-glucosidase activity) that paralleled the loss of vegetative structure
and diversity along the degradation gradient. Soil physical-chemical
properties were less variable and enzymatic activity was generally
higher in the dry season compared to the rainy season. We also showed
for the first time a significant and uniform decrease in POC and MAOC
with ecosystem degradation in a SDTF. The relative proportion of these
two components was constant along the gradient except for the most
degraded state (arid land), where POC was higher in proportion to MAOC,
suggesting that a functional tipping point may be crossed with extreme
forest degradation. These findings address an important knowledge gap
for SDTFs by showing a consistent loss of soil quality and functionality
with degradation and suggest that extreme degradation can result in an
alternate state with compromised resilience.
Sexual dimorphism and phenology interplay determines arthropod communities
Authors: González-Ramírez Ixchel , Cano-Santana Zenón , Romero Araceli Araceli , López-Gómez Víctor , Cumplido Johnattan Hernandez
Published: October 2023

Intraspecific variation in plants is expected to have profound impacts
on the arthropod communities associated with them. Because sexual
dimorphism in plants is expected to provide consistent variation among
individuals of the same species, researchers have often studied the
effect it has on associated arthropods. Nevertheless, most studies have
focused on the effect of sexual dimorphism in a single or a few
herbivores, thus overlooking the potential effects on the whole
arthropod community. Our main objective was to evaluate effects of
Buddleja cordata’s plant-sex on its associated arthropod community. We
surveyed 13 pairs of male and female plants every two months during a
year (June 2010-April 2011). Every sampling date, we measured plant
traits (water content and leaf thickness), herbivory, and the arthropod
community. We did not find differences in herbivory between plant sex or
through time. However, we found differences in water content through
time, with leaf water-content matching the environmental seasonality.
For arthropod richness, we found 68 morphospecies associated with female
and 72 with male plants, from which 53 were shared by both sexes. We did
not observe differences in morphospecies richness; however, we found
sex-associated differences in the diversity of all species and
differences on the diversity of the most abundant species with an
interesting temporal component. During peak flowering season male plants
showed higher values on both parameters, but during the peak
fructification season female plants showed the higher values on both
diversity parameters. Our research exemplifies the interaction between
plant-phenology and plant-sex as drivers of arthropod communities’
diversity, even when plant sexual-dimorphism is inconspicuous, and
highlighting the importance of accounting for seasonal variation. We
stress the need of conducting more studies that test this time-dependent
framework in other dioecious systems, as it has the potential to
reconcile previous contrasting observations reported in the literature.
Determinants of Severity due to Covid-19 Among Young Adults
Authors: Singh Mairembam Stelin , Singh Tanya , Ansari Mairaj Ahmed , Yellaboina Sailu
Published: October 2023

Background Coronavirus disease (COVID-19) is an emerging
infectious disease affecting people of all ages, races, and countries,
caused by the severe acute respiratory syndrome coronavirus
(SARS-CoV-2). The disease has been shown to be more lethal in select
individuals with existing comorbidities and inflammation. Although the
disease occurs in people of all ages, a milder course has been observed
in pediatric patients. Evidence suggests that the burden of COVID-19
infection is lower in hospitalized children than in their adult
counterparts. To date, there are few reports describing the factors
responsible for acute COVID-19 severity in young adults and their
differences in the elderly. In this work, we aimed to review the factors
responsible for determining the most severe cases with chronic clinical
manifestations by evaluating their clinical presentations to close the
gap and provide a potential basis to address this relationship between
severity and age. The lower severity in young adults could be due to a
variety of reasons, ranging from immunologic factors to genetic
composition. Our work helps classify some of these factors, which appear
to play a role in a small number of critical cases. The characteristic
ability of the younger human body to fight this deadly disease may be a
striking feature when trying to manage patients belonging to the older
age group. Setting All settings, including hospitalized and
community settings. Patients Children and young people (CYP)
under 20 years of age with PCR and other laboratory tests COVID -19
affected patients. Main results: Prevalence of symptoms and signs of
COVID -19. Purpose There are limited data on the demographics
and clinical features of SAR -CoV-2 infection in children. Therefore,
with this literature review, we aim to uncover various factors
responsible for the different severities in pediatric patients. This
will help us to better understand COVID -19 in different age groups.
Effects of short- and long-trem plant functional group loss on alpine meadow community structure and soil nutrients
Authors: Wei Jing , Zhou H , Shao Xinqing , sun jian , Ma Li , Zhang Zhonghua , qin min , su ye , hu xue , chang tao , shi chen , A haze , wang chun
Published: October 2023

We conducted a comprehensive investigation of the interrelationships
among the species diversity, productivity, community structure, and soil
nutrients of vegetation communities of an alpine meadow ecosystem on the
eastern Qinghai–Tibet Plateau. We performed biodiversity manipulation
experiments to examine the effects of removing plant functional groups
(Gramineae, Cyperaceae, Legumes, and other Forbs) for 3 and 10 years at
a research station in Haibei. Interannual variation in the species
richness and above- and belowground biomass of the community gradually
decreased over time. Species richness and productivity were positively
correlated, and this correlation became increasingly significant over
time. Removal of the plant functional groups resulted in fewer Gramineae
species within the community. However, soil total nitrogen, phosphorus,
organic matter, and moisture contents increased significantly in the
Legume removal treatment. The removal of other Forbs led to the lowest
negative cohesion values, suggesting that this community may have had
difficulty recovering its previous equilibrium state within a short
period of time. The effects of species removal on the ecosystem were
likely influenced by the species structure and composition within the
community. Changes in the number of Gramineae species indicated that
they were more sensitive and less resistant to plant functional group
removal. Legume removal may also have indirectly caused distinct
community responses through starvation and compensation effects. In
summary, species loss at the community level led to extensive species
niche shifts, which caused community resource redistribution and
significant changes in community structure.
Farm-wide fatigue loads estimation: a data-driven approach
Authors: N Francisco de Santos , Noppe Nymfa , Weijtjens Wout , Devriendt Christof
Published: October 2023

Fatigue has become a major consideration factor in modern
offshore wind farms as optimized design codes and a lack of lifetime
reserve have made continuous fatigue life monitoring become an
operational concern. In this contribution we discuss a data-driven
methodology for farm-wide tower-transition piece fatigue load
estimation. We specifically tackle the employment of this methodology in
a real-world farm-wide setting and the implications of continuous
monitoring. With reliable nacelle-installed accelerometer data at all
locations, along with the customary ten-minute SCADA statistics and
three strain gauge-instrumented ’fleet-leaders’ we discuss the value of
two distinct approaches: use of fleet-leader or population-based data
for training a physics-guided neural network model with a built-in
conservative bias, with the latter taking precedence. In the context of
continuous monitoring, we touch on the importance of data imputation,
working under the assumption that if data is missing, then its fatigue
loads should be modelled as under idling. With this knowledge at hand,
we analyzed the errors of the trained model over a period of nine
months, with monthly accumulated errors always kept below ±5%
. A particular focus was given to performance under high loads,
where higher errors were found. The cause for this error was identified
as being inherent to the use of ten-minute statistics, but mitigation
strategies have been identified. Finally, the farm-wide results are
presented on fatigue load estimation, which allowed to identify
outliers, whose behaviour we correlated with the operational conditions.
Finally, the continuous data-driven, population-based approach here
presented can serve as a springboard for further lifetime-based
decision-making.
Experimental and statistical investigation of fracture strength of pan/phenolicbased carbon/carbon composite materials
Authors: Iqbal Khurram , Bakhsh Nabi , Memon Shahzor
Published: October 2023

PAN/phenolic-based carbon/carbon composites are finding more and more use, and becoming more and more important for space/aviation industries, and general structural applications. The primary constituents of these materials are fragile, and cracking occurs through random failures caused by imperfectionsinduced random failures. The strength of a fragile material follows Weibull distribution. The variation of the flexural strengths has been modeled using Weibull distribution. In order to compute m and σu, first, the values of σi were ordered from the smallest to the largest, and then applying linear regression to these values. From the linear regression, the Weibull modulus and the characteristic strength were estimated. The CFRP composites show maximum flexural strength which decreases during the pyrolysis at the temperature of 1000 0C. The reduced flexural strength can be related to void defects. These defects probably act as a source of fractures during loading. The failure probabilities for CFRP and C/C composites are 0.55 and 0.78, respectively, and these values 334 and 92 MPa, and 29 and 10.2 GPa for mean flexural strength and flexural modulus, respectively, would be quite useful for understanding the fiber-matrix interfacial bonding properties, which have a strong influence on the mechanical properties of these composites.
Decoding the animated text-based captchas to verify their robustness against automated attacks
Authors: Arain Rafaqat Hussain , Shaikh Riaz Ahmed , Shah Safdar Ali , Shah Sajjad Ali , Rafique Saima , Ansari Ahmed Masood
Published: October 2023

In order to protect the web against automated attacks, CAPTCHAs are most widely used mechanism on the internet. Numerous types of CAPTCHAs are introduced due to weaknesses in the earlier designs. Animated CAPTCHAs are one of the design alternatives. Instead of presenting the whole information at once, animated CAPTCHAs present information in various frames over the specific interval of time. As CATPCHAs are ubiquitously used to avoid the serious threats from bots therefore it is important to verify their effectiveness. In this research we have verified their robustness against machine learning attacks. It has been proved that adding the extra time dimension does not necessarily ensure protection against automated attacks. We have attacked the Hello CAPTCHA scheme, which is the most popular animated CAPTCHA scheme available on the internet. By applying novel image processing and machine learning techniques, these CAPTCHAs are decoded with high precision. A pre-trained CNN is used to recognize the extracted characters. In this research, 6 popular types of animated CAPTCHAs along with 41 sub types were successfully deciphered with an overall precision of up to 99.5 %.
Antibacterial activity of cellulose/chitosan green composite for wound healing
Authors: Sanbhal Mazhar , Solangi Zulfiqar , Memon Sanam Irum , Sanbhal Noor , Khanzada Tahreem , Qureshi Khadija , Wei Wang
Published: October 2023

Cellulosic antibacterial fibers have great importance in the manufacturing of healthcare products. In this research work, antibacterial hemp and bamboo fibers were selected for manufacturing two green composite for wound healing. The chitosan was selected to get gel formation and behave as carrier in the manufacturing of cellulosic/chitosan green composite. Moreover, a water-soluble levofloxacin was included to give a release of antibacterial properties. The hemp and bamboo fibers were cleaned and fiber-to-fiber separation was done with a manual comber machine. The chitosan was solubilized using acetic acid and stirred for 12 hours to get a completely clear and viscous gel. Afterward, powder ground hemp and bamboo fibers were separately poured into two separate beakers. Two different types of composites (hemp/chitosan) and Bamboo/chitosan were transferred into petri dishes and dried in the oven at 400C for 24 hours. The samples were loaded with a levofloxacin antimicrobial agent. Both composites (hemp/chitosan, and bamboo/chitosan) were characterized for surface morphology, structural changes and antimicrobial testing against gram-positive and gram-negative bacteria. It was analyzed that without levofloxacin both cellulose/chitosan composites resisted bacteria growth and did not show inhibition zone, but samples loaded with levofloxacin displayed good antibacterial activity and showed excellent zone of inhibition against gram-positive and gram-negative bacteria. Futhermore, FTIR evidenced that there was no formation of cross linking composites, but composites were held together due to chitosan and fibers gel formation.
Performance, emissions, and combustion in turbocharged diesel engines: The effect of rapeseed oil biodiesel-diesel blends
Authors: Jayaraman Kamalakannan , Subramaniam Prabagaran , Srinivasnaik Mukuloth , Rajendran Sunilkumar
Published: October 2023

The need for sustainable alternative fuels is becoming increasingly urgent because to the rapidly expanding demand for automobiles and the growing concerns over the fossil fuel diminution. This research looks into how biodiesel, specifically blends made from rapeseed oil (RSO), can fill this new need. The RSO is created through transesterification, which yields a biodiesel with characteristics that meet ASTM requirements. In a 5.1 kW, single-cylinder, turbocharged Diesel engine (Turbo-DE), the performance, emissions, and combustion (P-E-C) characteristics of several RSO-diesel blends (B20, B40, B60, and B80) are examined and contrasted with those of pure diesel. According to the findings, brake thermal efficiency slightly decreases as biodiesel proportion in the blend rises. The environmental advantages of these blends are offset by a sizable decrease in smoke, CO, and hydrocarbon emissions. On the other hand, greater biodiesel ratios result in higher emissions of NOx and CO2. The thermal efficiencies of the brakes for diesel, B20, B40, B60, and B80 blends were found to be 29.3%, 28.6%, 27.9%, 27.2%, and 26.9%, respectively, in the detailed results. While smoke emissions decreased from 55% (diesel) to 40% (B80), NOx emissions ranged from 1556 ppm (diesel) to 1718 ppm (B80). The B20 blend?s combustion characteristics closely resemble those of diesel, with maximum cylinder pressures and ignition delay of 78 bar, 73 bar, 20%, and 18%, respectively, for diesel and B20. These results offer a good starting point for additional investigation into sustainable alternative fuels by shedding light on the prospective performance and ecological impact of biodiesel-diesel mixes.
Energy, exergy and exergoeconomic analysis of a trans-critical CO2 cycle powered by a single flash geothermal cycle in with/without economizer working modes
Authors: Aryanfar Yashar , Mohtaram Soheil , Garcia Castellanos Humberto , Tag-Eldin Elsayed , Arslan Busra , Deifalla Ahmed , Ragab Adham , Sun HongGuang
Published: October 2023

The global utilization of RES, particularly geothermal energy, is rising and the inefficient nature of geothermal cycles necessitates recovering lost heat. This research proposes a combined power generation cycle that simulates integrating a trans-critical CO2 cycle with a single flash geothermal cycle, utilizing the engineering equation solver. The study contrasts the system?s performance between two operating states: ?Without Economizer? and ?With Economizer?. The investigation analyzes the impact of an economizer on key output parameters, including energy efficiency, exergy efficiency, and net power output. In the ?With Economizer? operating state, the net power output experiences a noticeable increase from 201.5 kW to 204.7 kW, resulting in a 1.58% enhancement in the performance of the ?With Economizer? system. The energy efficiency metric demonstrates a corresponding improvement, rising by 1.55% from 3.28% in the ?Without Economizer? system to 3.331% in the ?With Economizer? system, aligning with the principles of the First law of thermodynamics. Furthermore, the energy efficiency, expressed as a percentage of energy units, shows an increase from 16.3% in the ?Without Economizer? system to 16.56% in the ?With Economizer? system, representing a 1.595% improvement based on the Second law of thermodynamics or exergy. Regarding cost analysis, the study identifies the optimal separator pressure value for the system without an economizer, equivalent to 23. This configuration achieves a total cost rate of 01 $ per GJ. Conversely, in the system with an economizer, the optimal pressure value for the production cost rate is 322.4 kPa, resulting in a cost rate of 23.57 $ per GJ.
Effect of internally mounted helical fins on the separation performance of a cylindrical gas-solid cyclone separator
Authors: Fu Zeming , Wu Huagen , Gao Baohua , Liang Mengtao , Wu Guanghua , Shang Shuo , Zhang Xin , Huang Hongye , Chen Siwei
Published: October 2023

In this study, an innovation was made by adding helical fins on the vortex finder of a cylindrical gas-solid cyclone separator, and the effect of this structural improvement on the separation performance was analyzed based on the flow field characteristics. The results show that both cyclones with and without helical fins exhibit a separation efficiency of almost 100% for particles larger than 5 ?m. As the inlet velocity increases, the effect of adding helical fins on the overall separation efficiency decreases, with a relative deviation of only 0.16% at an inlet velocity of 27 m/s, while it becomes increasingly effective in reducing energy consumption, with a pressure drop of 25.33%. The mechanism of the overall performance improvement lies in the fact that the helical fins change the flow field distribution in the cyclone, where the turbulence intensity in the vortex finder is significantly reduced, the tangential velocity of the external vortex is decreased, and the pressure gradient is reduced. The purpose of this paper is to provide new ideas for the optimal design of the internal components of the cyclone separator.
Engine performance and emission characteristics of microwave-produced biodiesel blends
Authors: Hamdi Fakher , Yahya Ilhem , Gassoumi Mehrez , Fazal Aliya , Ennetta Ridha , Soyhan Hakan
Published: October 2023

The main objective of this research is to investigate, experimentally, the effects of biodiesel blends on the performance and emissions of a Diesel engine. Measurements were carried out on a single-cylinder, four-stroke, and air-cooled compression-ignition engine, under half and full load conditions. Engine speed was varied from 1000-3000 rpm. Biodiesel was produced by transesterification process of sunflower oil with ethanol, using microwave-assisted heating reactor. Three biodiesel-diesel mixtures: containing 5%, 10%, and 20% by volume of biodiesel, respectively, have been tested and compared to pure diesel fuel. The effects of these biodiesel blends on the engine operating characteristics such as brake specific fuel consumption, brake power, brake thermal efficiency, brake mean effective pressure, and on carbon CO, CO2, and NOx emissions, have been investigated. It was noticed that, at full load, the specific fuel consumptions of biodiesel blends were higher compared to the pure diesel fuel, but no change was observed under ? load. An improvement in the brake thermal efficiency, under ? load, was obtained, but at full load, for medium and high speed, the thermal efficiencies of all biodiesel blends showed a decrease compared to pure diesel fuel. Concerning pollutants emissions, a decrease in CO emissions of all biodiesel blends was noticed. The best result in CO emissions was achieved by the mixture containing 10% by volume of biodiesel with an average reduction value close to 40%. In addition, a significant reduction in NOx emissions was observed for the three biodiesel blends.
Új nehézgép a Magyar Honvédségben: WiSENT 2HU
Authors: Kovács Zoltán , Ember István
Published: October 2023

A műszaki szakcsapatok feladatai rendkívül változatosak támogatniuk kell a saját csapatok manővereit, akadályozniuk az ellenségmozgását, és hozzá kell járulniuk a saját erők megóvásához. A feladatok végrehajtásához különböző képességekkel rendelkező speciális műszaki gépek szükségesek. Több országban is felismerték annak igényét, hogy olyan műszaki gépeket kell alkalmazni, amelyek teljesen eltérő jellegű szakfeladatokat is képesek megoldani, akár az ellenség tűzhatása alatt, különleges harctéri körülmények és terepviszonyok között is.
Felesleges lövészlőszerek szétszereléssel történő hatástalanítása
Authors: Éles Péter
Published: October 2023

A Magyar Honvédségben évtizedek alatt felhalmozódott felesleges lőszerkészletek akut problémákat okoznak, számottevő tárolókapacitást, és – kezelésigényük miatt – jelentős számú munkaerőt kötnek le. Mindemellett, az elöregedésükből fakadó stabilitásvesztésük veszélyes kockázati tényező. E felesleges lőszerkészletek jelentős részét a 7,62 mm-es 39M LPSZ és DPSZ, valamint a 43M PSZ lőszerek képezik. A szerző ezen lőszerek szétszerelési és hatástalanítási technológiáit ismerteti.
Safety and durable patency of tunneled hemodialysis catheter inserted without fluoroscopy
Authors: Kim Do Hyoung , Youn Sojung , Ban Tae Hyun , Choi Bum Soon , Kim Byung Soo , Park Cheol Whee , Yang Chul Woo , Park Hoon Suk
Published: October 2023

Background: A tunneled hemodialysis (HD) catheter is preferred due to its lower incidence of infection and malfunction than non-tunneled ones. For safer insertion, fluoroscopic guidance is desirable. However, if the patient is unstable, transfer to the fluoroscopy may be impossible or inappropriate. Methods: From June 2019 to September 2022, 81 tunneled HD catheter insertion cases performed under ultrasound guidance without fluoroscopy and 474 cases with fluoroscopy in our institutional HD catheter cohort were retrospectively compared. Results: Immediate complications, later catheter-associated problems, including infections and catheter dysfunction, were comparable between the two groups (p = 0.20 and p = 0.37, respectively). The patency of tunneled catheters inserted without fluoroscopy was comparable to the patency of tunneled catheters inserted with fluoroscopic guidance (p = 0.90). Conclusion: Tunneled HD catheter insertion without fluoroscopy can be performed safely and has durable patency compared to the insertion with fluoroscopy. Therefore, this method can be considered for the selected unstable patients (e.g., ventilator care) in the intensive care unit.
Kewaspadaan Global Amebiasis
Authors: Kurniawan Agnes
Published: October 2023

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“Quando nós tiramos 1, temos que pôr 1...”:
Authors: Araman Eliane Maria de Oliveira , Corrêa Lucas do Nascimento , Barros Ketheryn Letícia Gomes de , Serrazina Maria de Lurdes
Published: October 2023

Este artigo apresenta os resultados de uma pesquisa de característica qualitativa e interpretativa e tem como tema o raciocínio matemático e as ações do professor quando apoia o seu desenvolvimento. O objetivo foi analisar as ações empreendidas por uma professora dos primeiros anos de escolaridade, ao conduzir a discussão coletiva de uma tarefa exploratória de Matemática com uma turma de 1.º ano do Primeiro Ciclo do Ensino Básico. Realizou-se uma discussão teórica a respeito do raciocínio matemático e seus processos e sobre ações do professor que apoiam o desenvolvimento do raciocínio matemático. Os dados que compõem o corpus de análise desta pesquisa foram coletados por registros de áudio e vídeo, durante a discussão coletiva da tarefa exploratória na respectiva turma. Tais dados foram analisados, considerando quatro categorias de ações: convidar, guiar/apoiar, informar/sugerir e desafiar.  Os resultados indicam que as ações desempenhadas pela professora envolveram as quatro categorias previstas na literatura e que estas conduziram os alunos nos processos de conjecturar, identificar padrões, validar, justificar e generalizar.
Editorial - Número especial "Comemoração dos 25 anos da revista Educação Matemática Pesquisa"
Authors: Almouloud Saddo Ag , Manrique Ana Lucia
Published: October 2023

Número especial "Comemoração dos 25 anos da revista Educação Matemática Pesquisa"
Considerations about Ethnomathematics, the culturally relevant Pedagogy and social justice in Mathematical Education
Authors: Rosa Milton , Orey Daniel Clark
Published: October 2023

One of the challenges internationally faced by education systems is related to the growing number of students from linguistically and culturally diverse origins, a fact that calls the attention of teachers and researchers. Because these fields are connected to traditional education systems, there is a growing urgency to solve such inability to effectively reach all students. With respect to the social justice context, it is necessary assessing the embodiment of mathematics’ cultural perspective in the classroom, as well as creating the very basis for the ethnomathematics approaches and for pedagogy in mathematics discipline matrices, since it aims at developing this knowledge production. This approach focuses on promoting social justice and on the quality of students’ educational experience. Thus, this sociocultural diversity has growing in educational research, since it is an area that seeks to connect the daily experiences of students with the teaching and learning process aimed at making education systems humanized. In the context of social justice, it is necessary to examine how mathematics is found in all cultures and, at the same time, to base it on ethnomathematical and culturally relevant pedagogies that can assume, in mathematical curricula, the various linguistic and cultural forms of knowledge. Thus, the main objective of this approach is the integral promotion of student daily experiences in the school mathematics curriculum.
ventos do norte não movem os moinhos? Racismo epistêmico
Authors: Silva Marcio Antonio
Published: October 2023

Este artigo aborda o tema interseccionalidade na educação matemática para explicitar o racismo epistêmico existente. Por intermédio da apresentação de trechos de livros didáticos de matemática do ensino médio brasileiro, mais especificamente as páginas que tratam da história da matemática, argumenta-se que, nesses livros analisados, a matemática é europeia, masculina e branca, pois a narrativa construída pelos elaboradores desses livros reproduz a lógica eurocêntrica do conhecimento matemático, apagando outras histórias da matemática e criando uma narrativa muito específica sobre a construção do conhecimento humano. As análises foram feitas tendo a interseccionalidade como conceito fundamental, pois levou-se em consideração múltiplos aspectos, como gênero, etnia, raça e nacionalidade. A análise do discurso foi a ferramenta analítica que possibilitou olhar para os livros didáticos de matemática e descrever como ocorre a materialização dos discursos sobre o ensino e a aprendizagem, produzindo uma história sobre o ensino da matemática do nosso tempo, sobre o que é idealizado e o que é invisibilizado. Foram analisadas as oito coleções aprovadas no PNLD 2018, totalizando 24 volumes. Utilizando-se o software Atlas TI, foram investigadas seis características: (i) o conteúdo abordado; (ii) o continente de origem daquele personagem; (iii) se era uma citação em forma de texto ou se, além do texto (nome do personagem), havia também uma figura ou foto; (iv) gênero; (v) raça; (vi) nome. Foram encontradas 554 menções à cientistas e matemáticos, mostrando que, nos livros analisados, a matemática é construída por homens, brancos e europeus.
papel de las relaciones entre la función solución y su variación en el esquema de solución de los sistemas de ecuaciones diferenciales
Authors: Gaisman María Trigueros
Published: October 2023

En este artículo contribuye al conocimiento sobre el aprendizaje de los sistemas de ecuaciones diferenciales desde el punto de vista de los sistemas dinámicos. Se analiza la evolución del Esquema de sistemas dinámicos de dos variables en estudiantes universitarios, después de terminar un curso de sistemas dinámicos diseñado con la teoría Acción Proceso Objeto Esquema (APOE) como sustento del diseño de actividades utilizadas a lo largo del mismo. En particular, este estudio se enfoca en la forma en que los estudiantes dan significado a las estrategias que se utilizan para representar e interpretar los sistemas de ecuaciones diferenciales y las relaciones que establecen entre las estructuras que conforman el Esquema de sistemas de ecuaciones y en particular las relaciones entre la función y su derivada a través de las diferentes representaciones que se utilizan para estudiarlos. Este trabajo contribuye también a enriquecer la noción de Esquema y de interacción entre Esquemas de la teoría APOE, así como al análisis de las relaciones entre los distintos conceptos involucrados en y entre las diversas representaciones de las soluciones que juegan un papel en el contexto de los sistemas de ecuaciones diferenciales y, de manera importante en la comprensión de las funciones paramétricas.
Usos da argumentação na educação matemática
Authors: Silva Carneiro Joilma , Sales Teixeira Elder , Pereira de Oliveira Andréia Maria
Published: October 2023

O artigo tem como objetivo realizar uma revisão sistemática da literatura de estudos empíricos sobre usos da argumentação na Educação Matemática no Ensino Superior. Para tanto, foi realizada uma busca por artigos na base de dados Education Resources Information Center (ERIC), em periódicos específicos da área de Educação Matemática, entre 2012 e 2021. O período justifica-se por ser a década de pesquisas publicadas que antecede o início do presente estudo. Após a seleção e leitura desses artigos, foram identificadas as categorias de análise: argumentação como instrumento de análise de argumentos de estudantes; argumentação como instrumento nálise de argumentos de professores; argumentação como abordagem de ensino. A análise foi conduzida a partir de estudos da literatura, sobretudo adotando-se a perspectiva teórica da argumentação de Toulmin e de Perelman. Os resultados apontam três formas de usos da argumentação com relação à: abordagem de ensino, investigação sobre o ensino de provas, avaliação da relação entre argumentação e prova e investigação da qualidade da argumentação de estudantes e professores. No entanto, evidenciou-se a necessidade de que mais investigações sejam realizadas para avaliar o potencial de cursos focados em argumentação para disciplinas de matemática do Ensino Superior, principalmente, utilizando a abordagem de Perelman, cujos estudos realizados têm sido razoavelmente escassos.
ChatGPT e educação matemática
Authors: Borba Marcelo de Carvalho , Balbino Junior Valci Rodrigues
Published: October 2023

O presente artigo tem como objetivo discutir e abordar questões pertinentes às novas possibilidades e desafios impostos à educação matemática devido à popularização da inteligência artificial. Contudo, o que exatamente é a IA? Vamos refletir se o ChatGPT de hoje não é simplesmente uma versão atualizada da calculadora de quarenta anos atrás, do computador de mesa conhecido como "PC" e da internet das fases anteriores das tecnologias digitais em educação matemática. O texto busca considerar as recentes notícias sobre o tema, bem como uma série de testes simples conduzidos pelos autores com esse recurso, além de explorar questões relacionadas à ética e à geração de problemas para coletivos de seres humanos em constante mudança com as tecnologias digitais. O estudo sugere que enfrentaremos ainda preocupações éticas imensas, mas será de suma importância que pensemos em problemas a serem resolvidos para esse tipo de coletivo.
impacto provocado pela pandemia do covid-19 no sistema de recursos do professor de matemática
Authors: Silva Feitosa Francisco Eteval , Gomes Ferreira Veronica Gitirana , Dos Santos Rodrigues Roberta
Published: October 2023

Este trabalho é um recorte de uma pesquisa de pós-doutorado que visa a analisar o impacto do cenário pandêmico da Covid-19 no sistema de recursos de professores de Matemática da Educação Básica. Trazemos aqui um estudo de caso qualitativo fenomenológico realizado com nove professores do Amazonas. Os referenciais teórico e metodológico da pesquisa são a Abordagem Documental do Didático e a investigação reflexiva. Os dados foram obtidos a partir de entrevista semiestruturada gravada em vídeo e lidos à luz da análise de conteúdo. A pesquisa evidenciou que a desigualdade que há entre as escolas públicas e as particulares influenciou fortemente na forma como seus professores foram impactados pela pandemia no que tange a recursos tecnológicos, infraestrutura e suporte institucional. Observamos que, com a retomada das aulas presenciais, o sistema de recursos da maioria dos professores foi enriquecido com a inserção de aplicativos como o WhatsApp e de plataformas como o Canva. Contudo, futuras pesquisas deveriam investigar se, e de que maneira, os docentes integraram esses recursos adicionais em suas atividades pedagógicas.
Didática dos signos
Authors: Bampi Lisete Regina , Dummer Camargo Gabriel
Published: October 2023

Este artigo debruça-se sobre a tarefa de traduzir encontros com os mundos dos signos em aulas de matemática. Afirmado na noção de aprender, vislumbra o ensino da matemática como um movimento de uma Didática dos Signos. Para tanto, envolve-se em procedimentos de arquivamento e arquivização de um arquivo constituído por dissertações de mestrado desenvolvidas entre 2015 e 2020 no Programa de Pós-Graduação em Ensino de Matemática da Universidade do Rio Grande do Sul. Em um processo tradutório, categorias inventariadas surgem e mesclam-se na diferença, nos distanciamentos, nas regularidades e aleatoriedades de aproximações que emanam de um campo discursivo que não se distingue de uma prática. Entre discursos e práticas docentes analisados, produzimos um discurso próprio que oferece visibilidade a saberes de outros, sem jamais repeti-los. Não existe a pretensão de criar algo novo para o ensino da matemática; tampouco, objetivamos neutralizar discursos já existentes. O que queremos é perceber alguma ressonância no que já existe na aula de matemática, tomando como exemplo o arquivo em questão. Na atenção ao aprender, cogitamos que essa investigação pode se tornar uma lente a ser usada na pesquisa em educação e no ensino da matemática, onde professores e estudantes se exercitam em encenações de recriações do aprendizado.