bluuebunny/crossref_metadata_2025 huggingface dataset:
Authors: Nisa Najwa Kamilatun , Puspita Dewi Lies Anggi
Published: August 2024

Tujuan yang ingin dicapai dalam penelitian ini adalah untuk mengetahui pengaruh produktivitas kerja karyawan terhadap kinerja perusahaan onlineshop “WNJ.ID” ntuk mengetahui seberapa besar pengaruh produktivitas kerja karyawan terhadap kinerja perusahaan dan untuk mengetahui apakah kinerja perusahaan dapat diukur dari produktivitas kerja karyawannya. Berdasarkan hasil maka persamaan garis regresi sederhana adalah sebagai berikut Y = 4,150 + 0,891(X) + e. Berdasarkan hasil uji koefisien determinasi diperoleh nilai R Square sebesar 0,754 yang berarti bahwa variabel kinerja perusahaan (Y) dapat dijelaskan oleh variabel produktivitas kerja (X) sebesar 75,4%, sedangkan sisanya 25.6% dijelaskan oleh variabel lain di luar model yang diteliti. Hasil penelitian ini menunjukkan bahwa variabel produktivitas kerja memiliki pengaruh positif dan signifikan terhadap kinerja perusahaan dengan nilai t statistik 10,054 dan nilai signifikan 0,000 yang lebih kecil dari nilai signifikansi 0,05. Hal ini menunjukkan bahwa semakin tinggi tingkat produktivitas kerja maka nilai kinerja perusahaan semakin meningkat, begitupun sebaliknya. Kontribusi dari penelitian ini adalah sebagai pendukung keputusan WNJ.ID dapat memenuhi harapan, mampu meningkatkan produktivitas kerja, dan dapat memotivasi staf untuk lebih giat bekerja guna lebih meningkatkan kinerja bisnis.
 
Kata kunci: produktivitas kerja karyawan, kinerja perusahaan, produktivitas, kerja, kinerja.
KOMPETENSI DALAM PERSPEKTIF PENYELENGGARAN PELAYANAN AKTE KELAHIRAN DI KABUPATEN BOGOR
Authors: Subagdja Raden Oetje
Published: August 2024

The phenomenon that was raised as a research problem was the quality of Birth Certificate services organized by the Population and Civil Registry Office of Bogor Regency and its correlation with competence. The research was carried out according to the positivist paradigm (quantitative study). The population of this research is residents who have taken care of birth certificates and residents who are currently taking care of birth certificates at the Department of Population and Civil Registry of Bogor Regency. The community members are located in RW areas in 47 villages in Ciomas District, Ciawi District, Parung District, and Citeureup District. The research sample of 386 respondents was taken from a population of 1,115 people using the simple random sampling technique.  Analysis of the data using SEM (Structural Equation Models Analysis) and Frequency Distribution Analysis. The results of the study are as follows: The magnitude of the influence of Competence on the Quality of Birth Certificate Services is determined by tangible, reliability, responsiveness, assurance, and empathy. The magnitude of this influence reaches 0.543, which is considered less strong, positive, and significant. The existence of such an influence proves that between Competence and Quality of Birth Certificate Services there is a causal relationship (cause and effect) which means: if Competence is increased or increased, then the increase is followed by an increase in the quality of birth certificate services. Thus, the quality of birth certificate services provided by the Department of Population and Civil Registry of Bogor Regency can be improved by improving, improving, or optimizing 15 indicators of competence.
Changing Trends of Meitei Pung
Authors: Singh Lukram Tamphamani
Published: August 2024

In many culturally related traditional programs and customs of Manipur, Meitei Pung has taken a very important role since its inception. The changing facets in Meitei Pung have also played a very prominent role in the transforming Manipuri Culture. It has always been an area of interest to study the various elements that contributes in the perpetual change of culture that gives shape to the existence of a society in particular and a nation at large. Time and again, it has been expressed and agreed to, that culture holds a strong position in nurturing a strong foundation for a society, but nevertheless it experience a slow pace in the developmental process. But before delving into anything, it is primarily important to discuss on what actually constitutes a cultural change.
Pathé: génesis y significado de la ritualidad
Authors: Sosa Vega Isidro
Published: August 2024

La génesis de prácticas presentes no necesariamente se halla en las demarcaciones temporales señaladas por un modelo de explicación histórica. Muchas veces las improntas procesuales singulares muestran más allá de lo que muchos quieren mirar. En este artículo se desarrolla un planteamiento desde la antropología histórica. A través de los acontecimientos históricos de los antecesores de los actuales pobladores de Pathé, se devela el desarrollo del proceso de constitución del significado del ritual cambio de cargueros. Ritual condensador de significados de apertura y cierre del ciclo ritual practicado por los hombres y mujeres de esta comunidad; punto espacio-temporal que manifiesta los ámbitos de lo divino, humano y la naturaleza. La propuesta de Turner sobre el drama social sirve de herramienta analítica para comprender este proceso de simbolización de la narración mítica-fundacional de su santo patrón San Lucas.
Evaluation of Blood Levels of Carbon Monoxide in Smokers in Nnewi Metropolis
Authors: Omoyemwen Osakue Nosakhare , Okonkwo Chidiebube Wendy , Onah Ejike Christian , Onyenekwe Chinedum Charles , Osakue Nosakhare Eric , Njoku Chidiadi Maryann , Ehiaghe Friday Alfred , Obi Collins Uche , Ihim Augustine Chinedu , Onyenekwe Amara Joy
Published: August 2024

Cigarette smoking is a major source of exposure to carbon monoxide (CO). CO is a colourless, odourless gas that displaces oxygen in the blood, which can lead to a variety of health problems, including heart disease, stroke, peripheral vascular disease, cancer, reduced cognitive function, premature birth, and low birth weight. This study was conducted to evaluate the levels of Carbon monoxide (CO) in active smokers in Nnewi Metropolis. This was a cross-sectional study involving 100 participants comprising of 50 smokers and 50 non-smokers, all within the age range of 18-45 years. The participants were recruited by simple random sampling technique. Recruited smokers were grouped based on duration of smoking into those who had smoked for less than 2 years (n = 20), those who had smoked for 2 years to 5 years (n = 19) and those who had smoked for more than 5 years (n = 11). The participants were also grouped based on type of substance smoked into those who smoke cigarette (n-12) alone, those who smoked weed alone (n=20) and those who smoked other substances aside from cigarette and weed (n=18). Carbon monoxide levels was determined by spectrophotometric measurement of caboxyhaemoglobin as it has been validated various researches as valuable for measurement of exposure to carbon monoxide. Independent sample test and Analysis of variance (ANOVA) were used for statistical analysis of data. The mean ± SD carboxyhaemoglobin level (4.45 ± 0.86 %) smokers was significantly higher than in non-smokers (carboxyhaemoglobin 1.61 ± 0.21 %, p<0.001). There were no differences in mean levels of carboxyhaemoglobin between individuals who smoke cigarette compared to individuals who smoke weed (p>0.05), individuals who smoked cigarette compared to individuals who smoke other substances (p>0.05) and individuals who smoked weed compared to individuals who smoke other substances (p>0.05). Carboxyhaemoglobin was higher in individuals who have been smoking for more two years and above than in individuals who have been smoking for two years and above (p>0.05). This study observed that carbon monoxide level was higher in active smokers than in non-smokers. This study also observed that carbon monoxide was not dependent on the type of substance smoked. However, duration smoking for less than 2years was characterised by lower COHB% compared with duration of more than 2 years smoking. Although the levels of caaboxyhaemoglobin observed in smoker was below WHO approved permissible level of carbon monoxide in active smokers, the outcome of this study further buttresses the fact that smoking predisposes individuals to carbon monoxide toxicity.
Acute Toxicity and in-Vivo Antidiarrhoeal Activity of Leaf Extracts of Acacia Nilotica from Nasarawa West, Nasarawa State, Nigeria
Authors: Anzaku Samuel , Ngwai. Yakubu Boyi , Ishaleku. David , Igbawua Isaac Nyiayem , Datok Walong Danladi
Published: August 2024

The in vitro antibacterial activity of leaf extracts of Acacia nilotica has been demonstrated by several studies, including ours. Scientific evidence for in vivo use and safety need to be investigated. This study evaluates the acute toxicity and in vivo antidiarrhoeal activity of crude methanolic, aqueous, ethyl acetate and n-hexane leaf extracts of Acacia nilotica from Nasarawa West, Nasarawa State, Nigeria. The acute toxicity and lethality (LD50) were determined in mice using standard protocol. Mice infected with diarrhoea-causing bacteria Escherichia coli, Salmonella paratyphi and Shigella dysenteriae to induce diarrhea were treated with various doses of the extract, and observed for their response. All the crude extracts were acutely safe at the doses tested as there was zero death of the mice throughout the two weeks of the experiment. The oral LD50 is therefore, greater than 2000 mg/kg body weight. The crude extracts at 400 mg/kg and 200 mg/kg demonstrated antidiarrheal effect on bacteria-induced diarrhea in mice by their ability to significantly delay in the onset of diarrhea compared to the control group. The total number of stools (faeces) was significantly reduced and the amount of wet stool, which is influenced by fluid secretion, was significantly reduced in all the extract-treated groups compared to the control group. The results have shown that the leaf extracts of Acacia nilotica tested are both safe and have great potential in the treatment of diarrhoeal infection.
Analysis of the Levels of Self-Concept of People with Blindness in Harare Metropolitan Province, Zimbabwe.
Authors: Wasosa Henry , Mutisya Dr. Sabina , Munywoki Dr. Vincent
Published: August 2024

This study was on the exploration of the self-concept of people with blindness in Harare Metropolitan province, Zimbabwe. This was premised on the understanding that, people with blindness have a wide range of self-concepts just like sighted people. However, their experiences may impact their in unique ways. Some people with blindness may have a strong sense of identity and pride in their blindness while others may struggle with feelings of inadequacy or social isolation. The main objective of this study was to analyze the levels of self-concept of people with blindness in Harare Metropolitan province, Zimbabwe. The study embraced a mixed approach specifically an explanatory sequential design was used and it was grounded on Social cognitive theory by Albert Bandura. The study targeted people with visual impairment in Harare Metropolitan province in Zimbabwe. The researcher used Yamane formula obtain the sample size of 384 participants. Quantitative data was collected using a Robson Self-Concept questionnaire. An interview guide was also used to collect qualitative data. The quantitative data was analyzed using descriptive and inferential statistics. Thematic analysis was used to analyze qualitative data. The findings of the study indicated that, there were some attributes of the levels of self-concepts among people with blindness in Harare Metropolitan that were positive and highly rated, while others were moderately rated and a few were rated low. The study also made some conclusions and proposed some recommendations like Promoting Supportive Environments and Mentorship Programs, encouraging personal growth and skill development, be enhanced and this can be achieved through embracing the importance of accessibility and resources. to adopt individualized Support and Recognition of Diversity. Wasosa, H., Dr. Mutisya, S. & Dr. Munywoki, V. (2004) Exploration of the Self-Concept of People with Blindness in Harare Metropolitan Province, Zimbabwe
PERLINDUNGAN HUKUM BAGI KONSUMEN ATAS KERUSAKAN BARANG DALAM PELAKSANAAN PENGANGKUTAN BARANG MELALUI DARAT PADA PERUSAHAAN EKSPEDISI
Authors: Zacky Muhammad Hasanuz , Sulaksono Agam , Sasongko Hariadi
Published: August 2024

Penelitian ini bertujuan untuk menganalisis perlindungan hukum yang diberikan kepada konsumen dalam kasus kerusakan barang selama proses pengangkutan melalui darat, khususnya pada perusahaan ekspedisi J&T Express di Surabaya. Perusahaan ekspedisi memainkan peran penting dalam pengiriman barang, dan sering kali terjadi insiden kerusakan barang selama proses pengangkutan. Penelitian ini akan melibatkan studi normatif, yang melibatkan pengumpulan data hukum melalui studi kepustakaan dan penelitian hukum. Berdasarkan data hukum dan peraturan yang relevan, penelitian ini akan menganalisis kewajiban hukum perusahaan ekspedisi terhadap konsumen dalam hal perlindungan barang selama pengangkutan melalui darat. Selain itu, penelitian ini juga akan melibatkan pendekatan yuridis dengan mengumpulkan data melalui bahan hukum utama dengan cara menelaah teori-teori, konsep-konsep, asas-asas hukum serta peraturan perundang-undangan yang berhubungan dengan konsumen yang pernah menggunakan jasa pengiriman J&T Express Surabaya. Data yang dikumpulkan akan digunakan untuk memahami pengalaman konsumen terkait perlindungan hukum yang mereka terima dalam kasus kerusakan barang. Hasil penelitian ini diharapkan dapat memberikan pemahaman yang lebih baik tentang perlindungan hukum bagi konsumen dalam kasus kerusakan barang selama pengangkutan melalui darat. Diharapkan hasil penelitian ini dapat memberikan rekomendasi bagi perusahaan ekspedisi J&T Express Surabaya dan pihak-pihak terkait lainnya untuk meningkatkan perlindungan hukum yang diberikan kepada konsumen dan mengurangi insiden kerusakan barang dalam proses pengangkutan.
РЕШЕНИЕ ОБРАТНОЙ ЗАДАЧИФАРМАКОКИНЕТИКИ С ДИНАМИЧЕСКИМ ПАРАМЕТРОМ
Authors: Бектемесов Ж.М. , Бектемесов М.А.
Published: August 2024

Сахарный диабет все еще является одной из существующих актуальных глобальных проблем, нуждающихся в решении. Иодним из инструментов диагностики сахарного диабета могут стать методы математического моделирования. В данной статье реализованы методы решения обратных задач для восстановления параметров математической модели глюкозы-С-пептид для определения объема выработки природного инсулина и чувствительности поджелудочной железы к глюкозе. В работе рассматривается расширенная двух-камерная математическая модель состоящая из 4 обыкновенных дифференциальных уравнений, 7 параметров и одним параметром изменяющимся по времени, обозначающий, вводимый внутривенно, концентрацию глюкозы. Определение параметров осуществеленно с помощью методов решения обратных задач, используя метод Левенберга-Марквардта и дополнительную информацию о динамике С-пептида. Также был рассмотрен случай с 10% шумом в данных и сравнение результатов
ШЕКТЕЛМЕГЕН ОБЛЫСТА ПОЛЯРЛЫҚ ЕРЕКШЕЛІГІ БАР БЕЛЬТРАМИТЕҢДЕУІ ҮШІН ҚОЙЫЛҒАН БАСТАПҚЫ-ШЕКАРАЛЫҚ ЕСЕП ТУРАЛЫ
Authors: Көшербаева Ұ.Р. , Алтынбек С.А.
Published: August 2024

Сингулярлы коэффициенттері бар бірінші ретті дербес дифференциалдық теңдеулер жүйелеріне қойылғаншекаралық есептерді зерттеу екі бағытта қарастырылады. Біреуінің коэффициенттерінде сингулярлық нүкте бар, ал екіншісінде сингулярлы сызықтар бар. Бұл жұмыста ақырсыз облыста берілген полярлық ерекше нүктесі бар Бельтрами теңдеуі үшін қойылған бастапқы-шекаралық есеп шешілген. Қарастырылған теңдеудің коэффициентерінің координаталар бас нүктесінде бірінші ретті полюстері бар және олар 𝐿2(𝐺)класында жатпайды. Сондықтан И.Н.Векуаның аналитикалық аппаратымен қамтылмаған және жеке зерттеуді қажет етеді. Есептің шешімін табу үшін функционалдық анализ және комплекс айнымалыға байланысты функциялар теориясының әдістерімен ұштастыражасалған Ә.Б.Түнғатаровтың зерттеу әдістемесі пайдаланылды. Нәтижесінде полярлық ерекшелігі бар Бельтрами теңдеуіне қойылған бастапқы-шекаралық есептің шешімінің бар болу шарттары табылды және үзіліссіз шешімдері айқын түрде құрылды.
КВАНТТЫҚ-МЕХАНИКАЛЫҚ ЖҮЙЕЛЕРДІҢ МАТЕМАТИКАЛЫҚ НЕГІЗДЕМЕСІ
Authors: Қоштыбаев Т.Б. , Алиева М. Е. , Татенов А.М.
Published: August 2024

Мақалада жарықтың толқындық және бөлшектік қасиеттеріне жауапты параметрлердің (физикалық шамалардың) мағыналары мен рөлі кеңінен баяндалып, олардың арасындағы байланыстар жүйеленіп көрсетілген. Есептеулерді жүргізу ыңғайлы болу үшін және формулаларды ықшамдап жазу мақсатында қосымша тұрақтылар енгізілген. Электромагниттік сәулелер мен олардың фотондары үшін бөлшектік және толқындық параметрлердің сандық мәндері есептеліп, параметрлер арасындағы байланыстар енгізілген жаңа тұрақтылар арқылы жазылыпкөрсетілген. Жарыққа бөлшектік-толқындық принциптің классикалық үлгісі тұрғысынан қарай отырып оған классикалық электромагниттік толқындар түрінде тарайтын фотондар ағыны деп баға берілген. Толқындық және бөлшектік қасиеттердің бір-бірін толықтыратынының дәлелі ретінде фотонның бөлшектік қасиетіне сәйкес келетін шама оның толқындық қасиетін көрсететін шама арқылы анықталатын тұстары көрсетілген. Жарық табиғатының екі жақтылық қасиеттерінің қалыптасу, бәсекелестік және теория ретінде өмір сүру кезеңдері туралы да айтылған. Кванттық механикалық жүйелердің корпускулалық және толқындық концепциясы арқылы микробөлшектер әлеміндегі құбылыстардың идеялық мазмұны айқындала түседі. Ол кванттық және толқындық қасиетке жауапты параметрлерінің Планк тұрақтысы арқылы байланысқан қатынастар арқылы іске асырылады. Бұлардың ішіндегі басты шама энергия мен жиілік арасындағы байланыс.
МАТЕМАТИКА САБАҒЫНДА ОҚУШЫЛАРДЫҢ ФУНКЦИОНАЛДЫҚ САУАТТЫЛЫҒЫН ДАМЫТУ ЖӘНЕ БАҒАЛАУ
Authors: Сейтбекова Г.О.
Published: August 2024

Мақалада оқушылардың функционалдық математикалық және қаржылық сауаттылығын дамытудың өзекті мәселесі ретінде мектеп математика курсындағы тауар бағасының өзгеру пайызын есептеуге арналған тапсырмаларды шешудің тиімді тәсілдері туралы баяндалған. Зерттеудің мақсаты мен әдіс-тәсілдері көрсетіліп, сонымен қатар оқушыларға математикалық білім мен дағдыларды нақты өмірде қолдануға арналған үлгілік тапсырмалар мен бақылауға арналған тапсырмалардың бағалау критерийлері ұсынылған. Берілген тәсілдер арқылы қиындық деңгейі әр түрлі есептердің шешімін оңай, әрі тез табу жолдары қарастырылған. Мұндай өмірлік маңызы бар есептерді шешуге дағдылану тәжірибесі оқушылардың функционалдық, математикалық және қаржылық сауаттылығының дамуына ықпал етеді. Болашақ математика мұғалімдері мен еліміздің педагогтар қауымына математиканы оқыту процесінде функционалдық сауаттылықты дамыту мен бағалау тақырыбы шеңберінде көмекші дидактикалық материал ретінде және бағалау құралы ретінде қолдануға болатындығы айтылады.
APPLICATION OF STEM EDUCATION TO ANALYZE AND SOLVE PHYSICS PROBLEMS IN SCHOOLS
Authors: Sydykova Zh.K. , Naushabekov Zh.A.
Published: August 2024

This study's objective was to describe students' problem-solving skills. The purposive selection method was used to pick the sample from among 65 participants from 11 classes. Data are gathered via a test of problem-solving aptitude. Its four indicators are problem identification, problem formulation, problem resolution, and problem assessment. Project-Based Learning (PjBL) in Science, Technology, Engineering, and Mathematics (STEM) is increasing efficacy, creating meaningful learning, and influencing student attitudes toward future career pursuits. Project-based learning with a STEM focus causes learning (PjBL). Students' abilities to plan, communicate, solve problems, and come to the best judgments from the difficulties presented are all improved by the learning. Students' abilities to plan, organize, negotiate, and make agreements about the tasks to be completed, who is responsible for each activity, and how the information will be gatheredand presented can be developed through this learning.
Effect of breed and sex on carcass traits, meat quality and fatty acid composition of young cattle formed based on animal protein production and qualified meat in plateau condition
Authors: Yüksel Sadrettin , Karaçuhalilar Alpay , Balta Burcuhan , Şimşek Usame , Yüksel Fatma , Memiş Müslüme , Çelik Mevlüt
Published: August 2024

Abstract. This study was fictionalized as a prototype for other studies. The effects of breed and sex on the slaughter characteristics, carcass traits, meat quality and fatty acid composition of young animals, which were formed based on the enteric emission (CH4) level and animal protein production potential of different geographical regions were investigated. The region where the study was conducted consists of plateaus, and 13.7 % of the population lives in this area. A total of 36 animals, consisting of six males and six females from each of the Brown Swiss × Eastern Anatolian Red (BSEAR), Holstein Friesian × Eastern Anatolian Red (HFEAR) and Brown Swiss × Holstein Friesian (BSHF) genotypes, were used to investigate animal protein production in this study. They were dispatched to be slaughtered at the age of 20 months. The data were subjected to analysis of variance (ANOVA), and differences between groups were compared with the Duncan test. Enteric CH4 estimated among regions varied from 30.34 to 36.50 kg head−1 yr−1. It was 0.215, 0.194, 0.183, 0.195 and 0.198 kg, respectively, per kilogram of edible meat of BSEAR, HFEAR, BSHF, male cattle and female cattle. The results indicated that slaughter traits, carcass characteristics and carcass measurements (P<0.05 to P<0.01) were associated with breed. Slaughter traits, carcass characteristics and carcass measurements were affected by sex (P<0.05 to P<0.01). Breed and sex interaction had no effect on carcass characteristics in subgroups (P<0.05). DM, CP and ash were significantly affected by breed (P<0.05). pH and a∗ were also significantly affected by breed (P<0.05). Sex influenced pH (P<0.05), L∗ (P<0.001), a∗ (P<0.01) and b∗ (P<0.001). Monounsaturated fatty acid (MUFA) and polyunsaturated fatty acid (PUFA) levels were found to be significant in different breeds (P<0.01), and PUFA levels were significant in different sexes (P<0.05).
An Efficient Surrogate-based Multi-objective Optimisation Framework with Novel Sampling Strategy for Sustainable Island Groundwater Management
Authors: Yu Weijiang , Baù Domenico , Mayer Alex S. , Geranmehr Mohammadali
Published: August 2024

Abstract. In groundwater pumping optimization (GPO), offline-trained data-driven surrogates can be used to replace numerical-intensive simulators in order to save computing time. The traditional offline training approach involves building surrogates prior to optimization, fitting training datasets that cover the input space uniformly or randomly, which can prove inefficient due to the potential oversampling of low-gradient areas and under-sampling of high-gradient areas. This study proposes an offline machine-learning (ML) algorithm that ranks candidate training points by scoring them based on their distance to the closest training point and on the local gradient of the surrogate estimate and then choosing the highest-rank point. This method is applied to develop surrogates for solving a two-objective GPO problem formulated on a three-dimensional (3D) island aquifer, using hydrogeological conditions representative of San Salvador Island, Bahamas. The objectives are to minimise the supply cost (fOC) resulting from groundwater pumping and desalination and maximise fresh groundwater supply (Qp), subject to constraints on seawater intrusion (SWI) control expressed in terms of aquifer drawdown Δs at pumping locations and aquifer salt mass increase ΔSM. Gaussian Process (GP) is the technique applied to construct surrogates of objectives and constraints, alongside the estimation of uncertainties. Using GP models, it is possible to estimate the probability of “Pareto optimality” for each pumping scheme by Monte Carlo simulation. Pareto optimal pumping schemes (POPS) are then characterized by a probability of occurrence, which can be verified by numerical simulation. The GP training strategy's effectiveness in generating POPS is compared to traditional training approaches, showing that such a strategy can efficiently identify reliable POPS.
CO2 and summer insolation as drivers for the Mid-Pleistocene transition
Authors: Scherrenberg Meike D. W. , Berends Constantijn J. , van de Wal Roderik S. W.
Published: August 2024

Abstract. During the Mid-Pleistocene transition (MPT) the dominant periodicity of glacial cycles increased from 41 thousand years (kyr) to an average of 100 kyr, without any appreciable change in the orbital pacing. As the MPT is not a linear response to orbital forcing, it must have resulted from feedback processes in the Earth system. However, the precise mechanisms underlying the transition are still under debate. In this study, we investigate the MPT by simulating the Northern Hemisphere ice sheet evolution over the past 1.5 million years. The transient climate forcing of the ice-sheet model was obtained using a matrix method, by interpolating between two snapshots of global climate model simulations. Changes in climate forcing are caused by variations in CO2, insolation, as well as implicit climate–ice sheet feedbacks. Using this method, we were able to capture glacial-interglacial variability during the past 1.5 million years and reproduce the shift from 41 kyr to 100 kyr cycles without any additional drivers. Instead, the modelled frequency change results from the prescribed CO2 combined with orbital forcing, and ice sheet feedbacks. Early Pleistocene terminations are initiated by insolation maxima. After the MPT, low CO2 levels can compensate insolation maxima which favour deglaciation, leading to an increasing glacial cycle periodicity. These deglaciations are also prevented by a relatively small North American ice sheet, which, through its location and feedback processes, can generate a relatively stable climate. Larger North American ice sheets become more sensitive to small temperature increases. Therefore, Late Pleistocene terminations are facilitated by the large ice-sheet volume, were small changes in temperature lead to self-sustained melt instead. This concept is confirmed by experiments using constant insolation or CO2. The constant CO2 experiments generally capture only the Early Pleistocene cycles, while those with constant insolation only capture Late Pleistocene cycles. Additionally, we find that a lowering of CO2concentrations leads to an increasing number of insolation maxima that fail to initiate terminations. These results therefore suggest a regime shift, where during the Early Pleistocene, glacial cycles are dominated by orbital oscillations, while Late Pleistocene cycles tend to be more dominated by CO2. This implies that the MPT can be explained by a decrease in glacial CO2 concentration superimposed on orbital forcing.
Co-variability drives the inverted-V sensitivity between liquid water path and droplet concentrations
Authors: Goren Tom , Chourdhury Goutam , Kretzschmar Jan , McCoy Isabel
Published: August 2024

Abstract. Many studies using climatological data of liquid water path (LWP) and droplet concentration (Nd) find an inverted-V relationship, where LWP increases and then decreases with Nd. Our findings suggest that while these LWP responses to changes in Nd align with proposed causal mechanisms, such as entrainment evaporation feedback and precipitation suppression, the inverted-V is primarily driven by the co-variability between LWP and Nd. This co-variability arises from meteorological conditions and microphysical processes, each independently affecting LWP and Nd in opposite directions. We further demonstrate that the inverted-V relationship reflects the climatological evolution of Stratocumulus clouds (Sc). Therefore, background anthropogenic changes in Nd should, in principle, be manifested in changes across the entire Sc climatology along its evolution. Instantaneous LWP response to Nd derived from ship tracks, or other similar natural experiments, may therefore not accurately represent the climatological LWP response. This is because the local perturbations in Nd may not align with the plausible natural co-variability between LWP and Nd, which varies depending on the cloud state along the Sc evolution.
Measuring varve thickness using µCT: a comparison with thin section
Authors: Jamba Marie-Eugénie Meusseunan Pascale , Francus Pierre , Gagnon-Poiré Antoine , St-Onge Guillaume
Published: August 2024

Abstract. X-ray micro-computed tomography (μCT) scans were performed on four varved sediment cores collected in Grand Lake (Labrador) and previously studied with thin sections. These scans allowed to investigate the possibility of using µCT as a substitute for thin sections to carry out counts and thickness measurements of varved sediments. Comparing varve counts of these two methods, μCT counts are slightly higher than the ones made with thin sections. The difference in counts suggests that the petrographic study and a SEM analysis of a thin section remain necessary for determining the varve character of the laminae. Yet, µCT allows measurements in multiple directions, improving the robustness of the counts and allowing avoiding the manufacturing of continuous thin sections along sediment sequence. As to the thickness measurement, the µCT analyses were made in two perpendicular directions. Not surprisingly, measurements made on the same cutting plane as the thin section are quite similar to the ones made on the latter. However, there are significant differences with measurements made on the perpendicular plane. This highlights the need to perform varve thickness measurements in at least two perpendicular directions for better estimates of varved sediment thicknesses. In addition, the study illustrates that µCT is an effective way to select the least deformed zones with parallel varves to carry out the best possible thickness measurements.
Impact of Greenland Ice Sheet Disintegration on Atmosphere and Ocean Disentangled
Authors: Andernach Malena , Kapsch Marie-Luise , Mikolajewicz Uwe
Published: August 2024

Abstract. We analyze the impact of a disintegrated Greenland Ice Sheet (GrIS) on the global climate through steady-state simulations with the MPI-ESM (Max Planck Institute for Meteorology Earth System Model). This advances our understanding of the intricate feedbacks between the GrIS and the full climate system. Sensitivity experiments enable the quantification of the individual contributions of altered Greenland surface elevation and properties (e.g., land cover) to the atmospheric and oceanic climate response. Removing the GrIS results in reduced mechanical atmospheric blocking, warmer air temperatures over Greenland and thereby changes in the atmospheric circulation. The latter alters the wind stress on the ocean, which controls the ocean-mass transport through the Arctic Gateways. Without the GrIS, the upper Nordic Seas are fresher, attenuating deep-water formation. In the Labrador Sea, deep-water formation is weaker despite a higher upper-ocean salinity, as the inflow of dense overflow from the Denmark Strait is reduced. Our sensitivity experiments show that the atmospheric response is primarily driven by the lower surface elevation, whereas altered Greenland surface properties mostly amplify but also counteract few of the changes. The lower Greenland elevation dominates the ocean response through wind-stress changes. Only in the Labrador Sea, altered Greenland surface properties dominate the ocean response, as this region stores excessive heat from the Greenland warming. The main drivers vary vertically: The elevation effect controls upper-ocean densities, while surface properties are important for the intermediate and deep ocean. Despite the confinement of most responses to the Arctic, a disintegrated GrIS also influences remote climates. The altered climate in response to a GrIS disintegration also constrains a potential ice-sheet regrowth to high-bedrock eastern Greenland.
Effects of boundary conditions and aquifer parameters on salinity distribution and mixing controlled reactions in high-energy beach aquifers
Authors: Meyer Rena , Greskowiak Janek , Seibert Stephan L. , Post Vincent E. , Massmann Gudrun
Published: August 2024

Abstract. In high-energy beach aquifers fresh groundwater mixes with recirculating saltwater and biogeochemical reactions modify the composition of groundwater discharging to the sea. Changing beach morphology, hydrodynamic forces as well as hydrogeological properties control density-driven groundwater flow and transport processes that affect the distribution of chemical reactants. In the present study, density-driven flow and transport modelling of a generic 2-D cross-shore transect was conducted. Boundary conditions and aquifer parameters were varied in a systematic manner in a suite of twenty-four cases. The objective was to investigate their individual effects on flow regime, salt distribution, and potential for mixing controlled chemical reactions in a system with a temporally-variable beach morphology. Our results show that a changing beach morphology causes the migration of infiltration and exfiltration locations along the beach transect that lead to transient flow and salt transport patterns in the subsurface, thereby enhancing mixing controlled reactions. The shape and extent of the zone where mixing controlled reactions potentially take place as well as the spatio-temporal variability of the freshwater-saltwater interfaces are most sensitive to variable beach morphology, storm floods, hydraulic conductivity and dispersivity.
Technical note: Simple, exact and reliable way to extract soil water for stable isotope analysis
Authors: Kocum Jiří , Haidl Jan , Gebouský Ondřej , Falátková Kristýna , Šípek Václav , Šanda Martin , Orlowski Natalie , Vlček Lukáš
Published: August 2024

Abstract. Water stable isotope analysis in ecohydrological studies often requires soil water extraction. Here, we present a new soil water extraction method based on the principle of complete evaporation and condensation of the soil water in a lose circuit. We have developed an apparatus that has four extraction slots and can be used multiple times a day. Thanks to its simple design, there is no need for any chemicals, gases, high pressure or high-temperature regimes. A set of system functionality tests confirmed that the extraction method has high accuracy and high precision and does not cause any isotope fractionation effects leading to erroneous results. When extracting pure water samples, the accuracy is 0.04 ‰ and 0.06 ‰ for δ18O and δ2H, respectively, with a precision of ± 0.06 ‰ and ± 0.35 ‰ respectively. Soil water extraction tests were conducted with three soil types (loamy sand, sandy loam and sandy clay) using 50–80 grams of soil and water content of 20 %. The accuracy for the extraction of oven-dried and rehydrated soils ranged between -0.04 and 0.03 ‰ for δ18O and 0.06 and 0.68 ‰ for δ2H with precision of ± 0.06 to 0.13 ‰ and ± 0.34 to 0.58 ‰ for δ18O and δ2H, respectively in individual tests. These results are more accurate than results achieved by cryogenic vacuum extraction, which is the most widely used extraction method for soils. So far, our method was only tested for soil water extractions.
Modelling tsunami initial conditions due to rapid coseismic seafloor displacement: efficient numerical integration and a tool to build unit source databases
Authors: Abbate Alice , González Vida José M. , Castro Díaz Manuel J. , Romano Fabrizio , Bayraktar Hafize Başak , Babeyko Andrey , Lorito Stefano
Published: August 2024

Abstract. The initial conditions for the simulation of a seismically induced tsunami for a rapid, assumed-to-be-instantaneous vertical seafloor displacement is given by the Kajiura low-pass filter integral. This work proposes a new, efficient, and accurate approach for its numerical evaluation, valid when the seafloor displacement is discretized as a set of rectangular contributions over variable bathymetry. We compare several truncated quadrature formulae, selecting the optimal one. The reconstruction of the initial sea level perturbation as a linear combination of pre-computed elementary sea surface displacements is tested on the tsunamigenic Kuril earthquake doublet – a megathrust and an outer rise – that occurred in the central Kuril Islands in late 2006 and early 2007. We also confirm the importance of the horizontal contribution to tsunami generation, and we consider a simple model of the inelastic deformation of the wedge on realistic bathymetry. The proposed approach results are accurate and fast enough to be considered relevant for practical applications. A tool to build a tsunami source database for a specific region of interest is provided.
ISOLAMENTO E CARACTERIZAÇÃO MORFOLÓGICA E FISIOLÓGICA DE LEVEDURAS COM POTENCIAL PARA PRODUÇÃO DE CERVEJA
Authors: Pelegrini Roviero Juliana , Da Silva Barreto Leandra , Millena de Freita Cristhyane
Published: August 2024

Os componentes principais na produção de cerveja são água, malte, levedura e lúpulo, que, conforme a combinação de variedades ou técnicas de processamento, podem resultar em uma grande diversidade de sabores, tonalidades e fragrâncias. A levedura utilizada na produção de cerveja é a Sacharomyces cerevisae, no entanto, esta representa um dos maiores custos no processo. Neste contexto, esta pesquisa teve como objetivo coletar amostras do ambiente de fermentação da produção de cachaça, sabendo-se que há microrganismos não identificados, isolá-los e realizar testes de assimilação de açúcares, buscando-se cepas que podem apresentar potencial para a fermentação na produção de cerveja. Para o estudo foi coletada uma amostra do levedo do alambique Del Rey no município de Frutal - MG, e para efeito de comparação, utilizou-se também a levedura de cerveja comercial Safale-0505. Foi utilizado o meio de cultura Plate Count Ágar (PCA) para o isolamento e contagem dos microrganismos, e posteriormente feito o teste de assimilação de glicose e maltose, em temperatura de 20 ºC. Identificou-se o crescimento de três tipos diferentes de colônias de microrganismos nas amostras estudadas, caracterizadas como MCA1, MCA2 e MCA3 (isoladas a partir do levedo de alambique), e MCE1, MCE2 e MCE3 (isoladas a partir da amostra de levedura comercial cervejeira), que apresentaram características morfológicas diferentes. Com relação ao teste de assimilação de açúcares, a colônia MCE3 da cerveja apresentou resultado positivo na assimilação de maltose, da mesma maneira as colônias MCA2 e MCA3, apresentaram resultados significativos para o teste de assimilação de glicose e maltose, indicando que estas apresentam potencial para o uso na fermentação para produção de cerveja.
PENGARUH LATIHAN KEKUATAN OTOT MENGGUNAKAN RESISTANCE BAND TERHADAP HASIL LEMPAR CAKRAM SISWA KELAS X SMK NEGERI 1 CIREBON
Authors: Maulana Muhammad Andi , Setiawan Moch Iman , Praja Handayani Nila , Sundari Sri
Published: August 2024

Abstract
Tujuan studi. Tujuan penelitian ini adalah untuk mengetahui 1) pengaruh hasil belajar menggunakan resistance band terhadap hasil lemparan lempar cakram, 2) pengaruh hasil belajar menggunakan resistance band terhadap hasil belajar teknik lempar cakram, 3) perbandingan hasil teknik dan lemparan lempar cakram menggunakan resistance band terhadap hasil belajar siswa SMK Negeri 1 Cirebon.
Bahan dan metode. Penelitian yang digunakan adalah pretest-posttest group design. Sampelnya adalah siswa kelas X SMK Negeri 1 Cirebon yang berjumlah 71 siswa. Instrumen pengumpulan data meliputi hasil tes pretest dan posttest. Hasil penelitian ini menunjukkan hasil latihan menggunakan resistance band terhadap teknik dan lemparan lempar cakram serta perbandingan teknik dan lemparan lempar cakram.
Hasil. Penelitian menunjukkan bahwa (1) Terdapat pengaruh hasil belajar menggunakan resistance band terhadap hasil teknik lempar cakram, dengan thitung 41,485 dan ttabel 1,667 dan nilai signifikansi 0,000 < 0,05. (2) Terdapat pengaruh hasil belajar menggunakan resistance band terhadap hasil lemparan lempar cakram, dengan thitung 25,722 dan ttabel 1,667 dan nilai signifikansi 0,000 < 0,05. (3) Terdapat peningkatan hasil belajar teknik dan hasil lemparan dalam lempar cakram menggunakan resistance band, dengan persentase hasil teknik sebesar 4,10% dan hasil lemparan 5,77%.
Kesimpulan. Analisis temuan disajikan dalam tabel dan grafik yaitu 1) hasil teknik lempar cakram siswa, 2) hasil lemparan cakram siswa, 3) perbandingan antara teknik dan lemparan lempar cakram siswa. Kesimpulan dalam latihan resistance band terdapat pengaruh hasil belajar teknik dan lemparan lempar cakram siswa pada postttest.
Kata kunci: Lempar Cakram, Resistance Band, Teknik dan Lemparan Cakram
Mensuração de desempenho: construção da framework performance wheel para pequeñas empresas
Authors: Candeia de Lima Ana Lúcia , Ribeiro de Almeida Sabrina , Tavares Pessoa Maciel Emily , Cunha Callado Antônio André
Published: August 2024

O presente estudo objetivou a construção do modelo de medição de desempenho performance wheel como principal ferramenta de gestão e controle em uma micro empresa da cidade de João Pessoa. O estudo foi realizado por meio de metodologia qualitativa de estudo de caso, triangulando dados coletados mediante realização de entrevista semiestruturada e oficina de criação e implementação da performance wheel, análise de documentos internos e observação. Como principal resultado do estudo tem-se elaboração da missão, visão e valores e do framework completo para utilização na medição de desempenho dentro da organização participante. Além disso, ressalta-se as contribuições acadêmicas para aumento do arcabouço de pesquisas sobre a aplicação da performance wheel em pequenas empresas, e contribuições sociais realizadas por meio da demonstração da possível, sustentável, efetiva aplicação do modelo performance wheel no contexto organizacional de pequenas empresas.
Assessment of Effective Irradiance from UV Radiation in Some Welding Workshops within Ogbomoso, Nigeria
Authors: Temileyi Lawal, Serifat , Olukunle Olaonipekun Oladapo, , Emmanuel Abiodun Oni,
Published: August 2024

Background: Arc welding process emits different types of radiations such as ultraviolet, visible light and infrared radiation. It has been discovered that ultraviolet radiation (UVR) cause acute eye injuries such as photokeratitis with accompanying symptoms such as ocular pain, tearing, and a sensation of sand in the eye. This research aimed to assess impact of ultraviolet radiation on ocular tissues due to varied welding activities.
Methods: The irradiance from the UVR emitted from imported welding machine (MMA-250), and a locally constructed welding machine were measured using ultraviolet radiometer calibrated at 365 nm. Measurements were taken at 25 - 350 cm during continuous welding to maintain consistent estimated effective irradiance.
Results: The irradiances at 25 cm for locally constructed welding machine were in the range of 3.00 - 5.69 mW/cm2, and has a corresponding time limit of 0.53 - 1.0 s while irradiance at 25 cm for imported welding machine varied between 1.32 - 2.06 mW/cm2 and has a corresponding time limit of 1.5 - 2.3 s. At 50 and 100 cm, the irradiance for both locally constructed and imported welding machine are 1.23- 1.87 mW/cm and 0.58 - 1.16 mW/cm2 respectively. The irradiances at 25 - 100 cm for both welding machines were above the permissible exposure limits recommended by the American Conference of Governmental Industrial Hygienists (1.0 mW/cm2 for 16 s). The ANOVA test (p = 0.658) carried out on the effective irradiances from local and imported machines revealed that there is no significant difference between them.
Conclusion: The welding activities using locally and imported welding machines may pose radiological damage to the eyes of welders and cause severe damage to the tissue of the eyes. Hence, welders should be encouraged to comply with the safety guidelines of welding activities.

Key words: Ultraviolet Radiation (UVR), welding workshop, welders, irradiance.
The effectiveness of a dynamic seat cushion in preventing neck and low-back pain among high-risk office workers: a 6-month cluster-randomized controlled trial
Authors: Channak Sirinant , Speklé Erwin M , van der Beek Allard J , Janwantanakul Prawit
Published: August 2024

OBJECTIVE: This study evaluated the effectiveness of the promotion of postural shift intervention using a dynamic seat cushion on the 6-month incidence of neck and low-back pain among high-risk office workers.

METHODS: In a cluster-randomized controlled trial (RCT), 133 office workers were randomly assigned, at cluster level, to intervention (N=67) and control (N=66) groups. The intervention group received a dynamic seat cushion to encourage postural shifts during sitting, while the control group received a placebo seat pad. Primary outcomes were 6-month incidence of neck and low-back pain. Secondary outcomes included sitting discomfort, pain intensity, disability, and trunk muscle performance. Analyses utilized Cox proportional hazard models.

RESULTS: During the 6-month period, 15% of participants in the intervention group developed neck pain and 10% developed low-back pain. For the control group, this was 65% and 59%, respectively. Hazard rate (HR) ratios, after adjusting for biopsychosocial factors, indicated a protective effect of the intervention for neck pain [HRadj 0.19, 95% confidence interval (CI) 0.09–0.39, P<0.001] and low-back pain (HRadj 0.16, 95% CI 0.07–0.35, P<0.001). The intervention group demonstrated a significant reduction in sitting discomfort and improvement in trunk muscle performance compared to the control group (P<0.05). However, the intervention did not reduce pain and disability in individuals experiencing pain compared to the control group.

CONCLUSIONS: The dynamic seat cushion effectively reduced the incidence of neck and low-back pain by promoting postural shifts. These findings suggest that the key factor in reducing the risk of developing neck and low-back pain is the facilitation of postural shifts during sitting, which can potentially be achieved with other dynamic interventions designed to reduce prolonged and static sitting among office workers.
Reforma, Crise e Revolução em André Gorz
Authors: Amorim Henrique
Published: August 2024

A leitura da obra de André Gorz não é uma tarefa simples. Um comentário exaustivo da obra de Gorz deveria passar por seus primeiros textos de influência marcadamente sartriana, realizar uma análise dos artigos em revistas e jornais franceses e de outros países, resgatando em conjunto o principal objeto de sua análise depois do anos 1960: o trabalho.
Poulantzas, o Estado e a Revolução
Authors: Codato Adriano
Published: August 2024

O artigo expõe a teoria do Estado capitalista formulada por Nicos Poulantzas. É possível encontrar, em sua obra, três formulações sucessivas e diferentes sobre o que é o Estado: uma estrutura, um aparelho e uma relação social. A cada uma dessas definiçõescorresponde uma estratégia política sobre como derrubar o Estado capitalista, de sorte que os dois problemas, a função do Estado e a superação do Estado, têm de ser pensados em conjunto.
Os impasses da estratégia – os comunistas, o antifascismo e a revolução burguesa no Brasil. 1936-1948
Authors: Vianna Marly de A. G.
Published: August 2024

Se é indiscutível a importância do Partido Comunista do Brasil (PCB), não é tarefa fácil avaliar sua atuação e apontar seus erros sem desqualificar os que erraram e sem desmerecer seus muitos méritos. Embora abnegado e com a mais generosa das propostas – acabar com a exploração do homem pelo homem – o PCB cometeu erros aparentemente inexplicáveis. Sem satanizar personagens esem conciliar com os erros cometidos, Carlos Zacarias abre espaço importante para a discussão e o aprofundamento destas e de outras questões.
Da Declaração de Março de 1958 à renúncia de Jânio Quadros
Authors: Prestes Anita Leocádia
Published: August 2024

A partir da aprovação da Declaração de Março de 1958 pela direção do PCB, os comunistas brasileiros adotam uma nova orientação política. O objetivo tático do partido passa a ser a conquista de um governo nacionalista e democrático por meio do processo eleitoral e da pressão de massas, excluída a via armada prevista anteriormente nos documentos do PCB. No artigo são apresentadas e apreciadas criticamente as vicissitudes do partido na luta pela realização de tais objetivos durante a segunda metade do governo de Juscelino Kubitschek e os sete meses de Jânio Quadros no poder.