bluuebunny/crossref_metadata_2025 huggingface dataset:
Ser mulher indígena e mãe na universidade
Authors: Vasques Myrian Pereira , Pontes Thelma Mendes , Fernandes Ana Claudia
Published: April 2024

Para diversificar as opções de trabalho e fortalecer a posição política e social das mulheres indígenas, é fundamental investir em sua formação profissional. Uma das maneiras de contribuir com esta formação tem sido facilitar o acesso destas mulheres às redes federais de ensino e cursos da área de agrárias, que possuem potencial para oferecer capacitação a elas. Porém, é necessário também refletir sobre as dificuldades de permanência destas mulheres na universidade, principalmente das que são mães. Este exercício de escrita coletiva e autobiográfica da primeira autora objetiva refletir, desde sua vivência como estudante de agronomia, indígena e mãe, as questões relacionadas à sua permanência na universidade. Este trabalho auxilia a pensar uma academia verdadeiramente inclusiva: criativa, que valoriza os afetos, que redistribui poder e que seja reparadora e transformadora. A maternidade indígena é um convite à universidade a acolher e propiciar o bem-estar das mães, sujeitas de direito, ocupando espaços que democraticamente são de todas, todos e todes.
Enhancing Dimensional Accuracy in Fused Filament Fabrication: A DOE Approach
Authors:   Sr Vehicle Integration Engineer, USA, Naveen D Surabhi Srinivas , Dolu Surabhi Manogna ,   Quality Assurance Engineer, USA
Published: April 2024

3D printing is widely used in various fields and industries and is one of the most popular methods. Most popular advantage of this method is its flexibility in printing complex shapes and sizes. Quality is one of the important aspects when using this kind of technology which has a high advantage of printing complex shapes as this includes many factors like temperature, speed, material, infill types etc. In this paper one such analysis has been done by 3D printing parts under different factors. Analysis is done on how scaling factors affect the dimensions like height and diameter of a 3D printed part and check factors affecting these variations using Design of Experiments (DOE) analysis
Development of recipes and technology for butter cookies using various types of flour and flax seeds
Authors: Khatko Z. N. , Blyagoz A. I. , Bogus M. K. , Blyagoz R. Kh.
Published: April 2024

Extension of the assortment of products with increased nutritional and biological value can be achieved in different ways. One way is to use various supplements containing functional ingredients. This approach makes it possible to create food products with specified functional properties. This article presents a developed flour confectionery product, i.e. butter cookies using various types of flour and flax seeds. The characteristics of the chemical composition and functional properties of flax seeds have been presented. The choice of flax seeds as a functional ingredient is due to their high content of biologically active substances, a sufficiently large raw material base and availability. The use of flax seeds in the technology of butter cookies to enrich them with vitamins and minerals has been substantiated. Flax seeds and their processed products have a unique chemical composition, a wide range of properties and a set of biologically active substances. The influence of oatmeal and flaxseed flour on the quality of butter cookies has been studied and their optimal dosages in the cookie recipe selected. The optimal percentage ratio of wheat and oat flour has been established –90:10; wheat and flax flour – 90:10. The influence of flax seed dosage on the quality of butter cookies has been studied and the optimal percentage of flax seeds established – 10%. A recipe and technology for three types of butter cookies have been developed: butter cookies with the addition of flax seeds, butter cookies with the addition of oatmeal and flax seeds, butter cookies with the addition of flax flour and flax seeds.
Development of semi-finished fish products for the fast food industry
Authors: Asfondyarova I. V. , Yakovlev O. A. , Demchenko V. A. , Pavlovskaya N. A.
Published: April 2024

One of the segments of public catering market both abroad and in Russia is fast food products [1]. Restaurants of this format have a wide audience due to their loyal pricing policy, availability and constant new products [2]. In addition, the fast food industry, through various media and advertising, contributes to solving consumer problems related to lack of time, difficulty in preparation and ease of consumption. At the same time, fast food contributes to a decrease in the quality of nutrition and deterioration in the health of both young people and adults.

The goal of the research is to identify consumer preferences in the segment of semi-finished fish products, evaluate their quality and develop recipes for fish products for fast food restaurants.

The objectives of the research include marketing research of consumer preferences when choosing semi-finished fish products, assessing the quality of semi-finished fish products sold in retail trade and fast food establishments, and developing recipes for semi-finished fish products for the fast food industry. To conduct a social survey, Google-form has been used, organoleptic assessment has been carried out using 5-point grading scale; physicochemical indicators have been studied using standard methods.

Using the results of marketing research, it has been established that semi-finished fish products in the form of fish cutlets and sticks are in demand; consumers want to see new fish items on the menu of fast food restaurants. According to organoleptic assessment and physical and chemical research, it has been found that the best consumer organoleptic properties are found in fish cutlets from fast food restaurants «Vkusno i Tochka», «Burger King» and fish sticks sold in the «Perekrestok» chain of stores. According to physicochemical indicators, the studied samples of semi-finished fish products do not exceed 2.5% in the amount of table salt, 71% moisture and 37% fat.

As new items for the fast industry, recipes for semi-finished fish products were developed in the form of nuggets with the addition of processed cheese, pork fat and strips, from longitudinal strips of fish, breaded and deep-fried at a temperature of 180 ° C until golden brown.
Chromatographic determination of vitamin content in a bar with dried tomatoes
Authors: Bukhovets V. A. , Semilet N. A. , Novikova Yu. D.
Published: April 2024

There exists a problem of unbalanced nutrition in the modern world. Consumption of vegetables and fruits is mainly seasonal and they are not consumed by everyone in the daily diet in sufficient quantities to meet the daily requirement for nutrients. Snack products, including various bars, are becoming increasingly popular among the population of our country. Often there is an insufficient amount of vitamins and other micronutrients with such products that are so necessary to ensure the health of the human body. Insufficiency of these nutrients causes various diseases, the condition of the skin, hair, nails, and even mood worsens.

The goal of the research was to determine the amount of vitamins in a bar made from sunflower seeds with the addition of plant materials – crushed dried tomato fruits.

The objects of the study were a candy bar with the addition of rusk crumbs, containing 15% of dried tomatoes by weight of the finished product and a control sample – kozinak.

Tests were carried out on a Dionex Ultimate 3000 chromatograph using reverse phase chromatography on a Luna C18 column. This device is used to measure the content of a wide range of components in samples of substances and materials, solutions, food products and other objects of analysis.

It has been found that with the addition of a herbal additive and cracker crumbs to the recipe, the quanitative composition of vitamins A and E in the finished product increased compared to the control sample.

The results of the research can be used in the development of new food recipes.
An integrated approach to assessing the quality of wines sold on Maikop consumer market
Authors: Lunina L. V. , Tazova Z. T. , Siyukhova N. T.
Published: April 2024

The quality and safety of food products is one of the main priorities of the Russian State policy in the field of nutrition and well-being of the population.

Grape wines are a special type of food product; they are alcoholic beverages obtained as a result of complete or incomplete fermentation of whole or crushed fresh grapes or grape must. The combination of mutual influence of such factors as grape variety, climatic conditions, cultivation methods and production technology gives each wine its uniqueness and character.

These features are characteristic for natural drinks, which, unfortunately, are becoming fewer and fewer today, despite the implementation of control and supervisory activities and the adoption of various government regulation measures.

The presence of wines of dubious quality on the shelves gives rise to a number of serious consequences, both for public health and for the state economy.

The article presents the results of research on a comprehensive assessment of the quality of wines sold on the regional consumer market.

The determination of the organoleptic and physico-chemical parameters of wines regulated by GOST has been carried out according to the methods established in the current regulatory documents; the determination of the qualitative and quantitative composition of volatile components and cationic composition has been carried out using the gas chromatographic method and the capillary electrophoresis method.

It has been established that 30% of the total volume of wine samples studied is distinguished by rather low organoleptic characteristics, with full compliance with the established requirements in terms of physical and chemical indicators, and 10%, based on the total assessment of organoleptic, physical and chemical indicators, component and cationic composition, are identified as counterfeit products.
A Doença renal crônica secundária à diabetes mellitus tipo 2
Authors: Couto Cristiane , Auad Leal Barbosa Lima Anna Victória , Rodrigues Guedes Fábia , Berardo Dubal da Silva Gabrielly
Published: April 2024

A diabetes mellitus é uma síndrome metabólica de origem múltipla, decorrente da falta de insulina e/ou da incapacidade de a insulina exercer adequadamente seus efeitos. A classificação dessa condição é dividida em dois principais tipos e, nesse estudo, o conceito será direcionado ao tipo 2, que resulta da resistência à insulina e de deficiência na secreção de insulina. Os rins têm seu sistema de funcionamento fortemente acometido diante dos níveis de glicose elevados no sangue. Pacientes com diabetes mellitus tem grande predisposição de desenvolver nefropatia diabética se o controle glicêmico não estiver compensado. A nefropatia diabética apresenta diferentes graus, sendo o mais avançado aquele em que o paciente necessita de diálise, a partir do estágio IV de doença renal crônica. O presente estudo tem como objetivo relatar um caso de Doença Renal Crônica secundária à Diabetes Mellitus que não obteve resposta ao tratamento conservador.
Efeitos adversos do Tamoxifeno em paciente com câncer de mama
Authors: Azevedo Millena , Cunha Ana Paula , Moraes Dias Pereira Luiza , TADEU SANTOS DE ALMEIDA Thiago
Published: April 2024

O câncer de mama é a neoplasia de maior incidência e mortalidade entre as mulheres no Brasil. Quanto ao tipo histológico, o carcinoma ductal é o mais prevalente, seguido do lobular infiltrativo e de outros subtipos. Já na classificação molecular há o Luminal A e Luminal B, com receptores hormonais positivos e, portanto, tornam-se alvos da terapia sistêmica com Tamoxifeno, considerada a principal hormonioterapia adjuvante na pré-menopausa. A droga possui ação antagonista no tecido mamário e agonista em outros sítios, contribuindo para os principais efeitos adversos relatados como fogacho, ressecamento vaginal, esteato-hepatite, risco aumentado de câncer de endométrio e de útero e retenção hídrica. Este artigo teve como objetivo relatar o caso de uma paciente que fez uso de Tamoxifeno e relacionar aos seus principais eventos adversos. Conclui-se que diante das adversidades encontradas no tratamento hormonal, o benefício se sobrepõe aos riscos relatados.  

Palavras- chave: Câncer de mama. Tamoxifeno. Efeitos adversos.
EFEKTIVITAS MODEL PEMBELAJARAN SCRAMBLE BERBANTUAN POWERT POINT DALAM MENINGKATKAN MINAT DAN HASIL BELAJAR KOGNITIF
Authors: Anriani Ririn , Jamaluddin  , Anna Primadoniati
Published: April 2024

Penelitian ini bertujuan untuk mengetahui efektivitasmodel pembelajaran scramble berbantuan powert point dalam meningkatkanminat belajar peserta didik pada mata pelajaran fiqhi kelas IX di MTs Nurul Izzah Kalamisu, efektivitasmodel pembelajaran scramble berbantuan powert point terhadap peningkatanhasil belajar kognitif peserta didik pada mata pelajaran fiqhi kelas IX di MTs Nurul Izzah Kalamisu. Penelitian yang digunakan adalah penelitian eksprimen dengan pendekatan kuantitatif.Adapun populasi pada riset ini adalah 30 orang.Langkah teknis pengumpulan data dengan menggunakan instrumen angket/kuesioner, soal test dan dokumen.Selanjutnya untuk analisis data digunakan program Spss versi 22.Dari hasil penelitian diperoleh gambaran bahwa 1) Berdasarkan hasil analisis bahwa pembelajaran dengan menggunakan model scramble berbantuan powert point efektif terhadap peningkatan minat belajar peserta didik pada mata pelajaran fiqih. Hal ini dapat dilihat dari nilai sig. (2-tailed) 0.000 dimana nilai tersebut ˂ 0.05, maka Ha diterima dan H0 di tolak dan hasil uji pairet simple t test bahwa sebelum diterapkan model pembelajaran scramble berbantuan powert point dalam meningkatkan minat belajar peserta didik adalah rata-rata 43,47 setelah diterapkan minat belajar peserta didik adalah rata-rata 60,93 artinya model pembelajaran Scramble berbantuan powert point cukup efektif dalam meningkatkan minat belajar peserta didik mata pelajaran fiqhi. 2) Berdasarkan hasil analisis bahwa pembelajaran dengan menggunakan model scramble berbantuan powert point efektif terhadap peningkatan hasil belajar kognitif peserta didik pada mata pelajaran fiqih. Hal ini dapat dilihat dari nilai sig. (2-tailed) 0.000 dimana nilai tersebut ˂ 0.05, serta dapat dilihat dari skor rata-rata yang didapatkan pada hasil posttest dengan nilai 79.3333 lebih besar dari nilai rata-rata hasil pretest dengan nilai 61.3333. Maka H0 ditolak dan Ha diterima artinya terdapat model pembelajaran Scramble berbantuan powert point cukup efektif dalam meningkatkan minat belajar peserta didik mata pelajaran fiqhi.
Impact of Various Levels of Salinity Stress on Growth Attributes of Some Salt-Sensitive and Tolerant Varieties of Mung Bean
Authors:   Bahauddin Zakariya University Multan, Institute of Botany, Pakistan, Afzal Shehrooz , Samreen Faiza ,   Department of Botany, Punjab College MianChannu District Khanewal, Pakistan, Salam Aiman ,   Department of Botany, Punjab College MianChannu District Khanewal, Pakistan, Shaf Nisha ,   Department of Botany, Punjab College MianChannu District Khanewal, Pakistan, Shabbir Suniana ,   Department of Botany, Punjab College MianChannu District Khanewal, Pakistan, Munawar Izwa ,   Department of Botany, Punjab College MianChannu District Khanewal, Pakistan, Naveed Merum ,   Department of Botany, Punjab College MianChannu District Khanewal, Pakistan, Javed Ishrat ,   Department of Botany, Punjab College MianChannu District Khanewal, Pakistan, Subhan Shama ,   Bahauddin Zakariya University Multan, Institute of Botany, Pakistan
Published: April 2024

Salinity stress poses a significant threat to crop productivity, and understanding the mechanisms of ion uptake and distribution in different cultivars is crucial for developing salt-tolerant varieties. This study investigates the patterns of ion uptake and distribution in salt-sensitive and salt-tolerant cultivars of Vigna radiata, commonly known as mung bean. Hydroponic experiments were conducted under controlled conditions to assess the responses of two contrasting cultivars to varying salt concentrations. The study reveals distinct differences in the ion uptake and distribution between salt-sensitive and salt-tolerant cultivars of V. radiata. Salt-sensitive cultivars exhibited increased sodium (Na+) accumulation in both roots and shoots under saline conditions, leading to disrupted ion homeostasis. In contrast, salt-tolerant cultivars demonstrated efficient ion regulation mechanisms, with a higher capacity for potassium (K+) retention and a lower Na+ to K+ ratio. The study also shed light on the involvement of ion transporters and channels in facilitating differential ion accumulation, highlighting the molecular mechanisms contributing to salt tolerance in Vigna radiata. These findings provide valuable insights into the adaptive strategies of salt-tolerant cultivars, offering a basis for targeted breeding programs aimed at enhancing salinity resilience in this economically significant legume. In summary, this research deepens our understanding of the intricate relationship between ion uptake and distribution in Vigna radiata varieties with varying salt tolerance. It lays the groundwork for developing robust crop varieties capable of thriving in saline environments.
Psychological Responses to Exclusion: Examining Rejection Sensitivity Pattern in Asian and European Patients Population
Authors:   Institute of Psychology, Wyzsza Szkola Ksztalcenia Zawodowego, Poland, Wilczynska Agnieszka
Published: April 2024

Background: This article aims to investigate and compare rejection sensitivity patterns in patients from Asian and European cultural backgrounds who have experienced social exclusion. Rejection sensitivity, a psychological construct characterized by heightened responsiveness to perceived rejection, is often associated with negative psychological outcomes. By examining the experiences of exclusion and their impact on rejection sensitivity in patient populations across diverse cultural contexts, this study seeks to shed light on the interplay between socio-cultural influences and psychological and physiological responses to social exclusion.
Physical Attraction Measured Through a Body Figure Scale in an Age of Changing Body Ideals
Authors:   Joint Health Command, Australian Army, Australia, Selman Jason , Rushton Cheryle ,   Australian Psychological Society, Australia
Published: April 2024

There is a substantial body of research that uses figure rating scales for personal body image assessment and satisfaction. The aim of this research was to determine the difference in attractiveness of physical body image by age of men and women. 460 participants who were representative of the population of a major Australian regional city were sampled using face-to-face interviews and a computer-based figure rating scales survey tool. Women were found likely to identify thin images of women as more attractive to men; and men were found likely to identify more muscular images of men as more attractive to women. These findings replicate similar studies and have implications for clinical treatments related to body image, eating disorders, and compulsive exercise.
Pregnancy, Diabetes and Obesity – Prevention of Obesity in the Next Generation
Authors:   Department of Obstetrics and Gynecology, Bar Ilan University, Israel, Soltsman Sofia , Shlomo Izhar Ben ,   Reproductive Endocrinologist, Obstetrician & Gynecologist, Zefat Academic College,  Israel
Published: April 2024

Diabetes mellitus is a widely occurring disorder, and obesity is its main feature. As the burden of obesity is increasing steadily, it leads to the increasing prevalence of diabetes, as well as of the most common non-communicable diseases. A comprehensive approach for the prevention of obesity appears to constitute the most effective intervention to reduce their prevalence worldwide. Numerous measures were applied to treat obesity and prevent its complications, of them different types of diet, physical activity, behavioral programs, pharmacologic interventions, and surgical treatments – but all of them have a significant degree of dropping-off and weight-regain over time. In this review we highlight pregnancy as a key period in a woman’s life, which can improve compliance with these programs and affect the next generation’s health, breaking the vicious cycle of family obesity
Antidepressant-Induced Testicular Alterations in the Normal and Depressed Mice
Authors:   Department of Zoology, MMV, Banaras Hindu University, India, Kumar Sandeep , Tripathi Anima ,   Department of Zoology, MMV, Banaras Hindu University, India, Singh Poonam ,   Department of Zoology, MMV, Banaras Hindu University, India
Published: April 2024

Introduction: Antidepressants are commonly used in the treatment of depression and several other mental health disorders. Since antidepressants are known to cause a variety of side effects, their adverse effects on reproductive health are a matter of great concern because of the raising trend of infertility in current scenario.
Analysis of Gender Assignment and Gender Transition in Chinese Patients with Disorders of Sex Development
Authors:   Department of Plastic and Reconstructive Surgery, Changzheng Hospital, Navy Medical  University, China, Liu Zhiwan , Gao Hong ,   Department of Plastic and Reconstructive Surgery, Changzheng Hospital, Navy Medical  University, China, Zhou Di ,   Department of Plastic and Reconstructive Surgery, Changzheng Hospital, Navy Medical University, China, Hu Zheyuan ,   Department of Plastic and Reconstructive Surgery, Changzheng Hospital, Navy Medical University, China, Zhang Wenjun ,   Department of Plastic and Reconstructive Surgery, Changzheng Hospital, Navy Medical  University, China, Zhao Yaozhong ,   Department of Plastic and Reconstructive Surgery, Changzheng Hospital, Navy Medical  University, China, Zhu Xiaohai ,   Department of Plastic and Reconstructive Surgery, Changzheng Hospital, Navy Medical  University, China, Zhu Lie ,   Department of Plastic and Reconstructive Surgery, Changzheng Hospital, Navy Medical  University, China
Published: April 2024

Background: For individuals with DSD, the decision of gender assignment at birth is a challenging one and the incidence of gender dysphoria in adulthood is much higher than that in the general population.
The Significance of Professionalism in Real Estate Practice: A Systematic Review
Authors: Mangili Camella Mae
Published: April 2024

This explores the significance of professionalism in real estate practice, emphasizing its role in building trust with clients. This systematic review examined the five key themes that define professionalism across various regions in the globe. These themes include fostering trust, ethical conduct, market expertise, effective communication, and continuous learning. Cultural sensitivity and adaptation are important in a globalized real estate market. It then delves deeper into the case of the Philippines, focusing on the Cordillera Administrative Region (CAR). The paper explores the national requirements for professional conduct in the Philippines and the distinct challenges faced by real estate professionals in the Cordillera region. While acknowledging the positive aspects, this paper identifies areas for improvement, particularly regarding accessibility to continuing professional development (CPD) programs like culturally sensitive investing in online learning platforms to ensure wider accessibility for geographically dispersed professionals in the Cordillera region. The paper concludes with recommendations for the Philippines to address these challenges and empower Cordillera real estate professionals. By implementing these suggestions, the Philippines can contribute to a more professional and ethical real estate industry nationwide.
How Women’s Financial Exclusion is Affecting Gender Equity in Tea Farming in Singorwet Ward, Bomet County
Authors: Agnes Chepkirui , Parsitau Dr. D. S , Opollo Dr. Diana A.
Published: April 2024

Access to finance by women within communities is key to ensuring improved economies and better livelihoods. Having money at hand means women can purchase/ access quality seeds, good farm equipment and efficient technologies. Indeed, money will help women improve their own life style and that of their families (FAO, 2019) The research objectives were to examine the extent of financial exclusion of women in tea farming from the farm all the way to accessing benefits from tea and how it’s affecting gender equity. A cross sectional study design was used and a sample size of 532 tea farmers’ respondents (comprising of 431 male tea farmers and 101 female tea farmers), 2 directors and 10 farm labourers were involved in this study. Purposive sampling was used to pick two director zones in Singorwet ward and stratified random sampling to pick five tea buying centres within Singorwet Zone and Mugango Zone. Questionnaire, interviews and observation schedule were used for data collection. From the findings, it is evident that women though the majority in the tea farming workforce; are the minority in tea farm monthly pay and bonuses. The study recommends a detailed and close to communities’ financial literacy that presents information on owning a tea farm, having a bank account, savings and getting credit from credible sources.
Economically Imperative Ananas comosus Diseases, Status, and Its Control Measures Documented in Producing Countries
Authors: Mohd Anuar Intan Sakinah , Nusaibah Syd Ali , Sapak Zaiton
Published: April 2024

Ananas comosus, commonly known as pineapple, is a fruit with a large potential market as a commodity and commercial fruit. Numerous pests and diseases affect pineapple, directly or indirectly, by lowering the quality and quantity. The fungal causative agents, namely Fusarium ananatum and Thalaromyces stolii (previously named Penicillium funiculosum), cause fruitlet core rot (FCR) and fusariosis by Fusarium guttiforme. Bacteria heart rot (BHR) is an infection by Erwinia chrysanthemi, newly known as Dickeya zeae. Nevertheless, the mealybug wilt of pineapple (MWP) is another pineapple treat to susceptible pineapple varieties caused by pineapple mealybug wilt-associated viruses (PMWaVs). Other diseases include destruction caused by pathogenic nematodes. This review discusses the status of these diseases and the control measures that greatly affect the economy of pineapple-producing countries due to the economic significance of these crops. Growers need up-to-date information on the identity of the diseases that affect pineapple crops in the various countries that produce them to effectively manage the diseases in the field.
Effect of Leaf Pruning and Additional Fertilizer on Growth and Young Pods Yield of Winged Beans
Authors: Tustiyani Isna , Melati Maya , Arifin Aziz Sandra , Syukur Muhamad , Nur Faridah Didah
Published: April 2024

Winged bean (Psophocarpus tetragonolobus L.) exhibits luxuriant foliage, making leaf pruning essential to enhance sunlight interception. Additionally, supplementing with additional fertilizer helps offset the impact of gradual harvesting. Therefore, this research aimed to determine the effect of leaf pruning and additional fertilizer on the growth and yield parameter of winged beans in the Institut Pertanian Bogor (IPB) experimental station at Leuwikopo, IPB University, Bogor, Indonesia. A randomized complete block design was used with two factors and three replications, namely leaf pruning intensities (0, 15, and 30% leaf pruning) and rates of additional fertilizer (0, 6.25, 12.5, and 18.5 g NPK 16-16-16/plant). The observed variables were plant height, leaf number, root length, leaf nutrient, auxin content, nutrient uptake, and young pods yield. The findings revealed that the interaction of pruning intensities and additional fertilizer rates significantly influenced leaf number and root length. Specifically, plants receiving a treatment combination without pruning and 6.25 g of additional fertilizer/plant exhibited the highest leaf number. In contrast, those subjected to 15% leaf pruning showed the greatest root length. Leaf nutrient levels, auxin content, and nutrient uptake exhibited noticeable improved with the addition of fertilizer. Meanwhile, a higher phosphorus and organic carbon content was observed in the 15% pruning treatment, and the young pods yield were not affected because the Fairuz variety reached its potential yield. Based on the results, the most recommended treatment is a combination without leaf pruning, supplemented with 6.25 g of additional fertilizer/plant.
Nghiên cứu các mô hình số mô phỏng tải trọng nổ lên kết cấu bê tông cốt thép sử dụng phần mềm Abaqus
Authors: Lê Bá Danh
Published: April 2024

Để hạn chế tối đa thiệt hại do tải trọng nổ lên các công trình bê tông cốt thép, việc nghiên cứu về tác động của tải trọng này lên kết cấu bê tông cốt thép là hết sức cần thiết, để từ đó có các giải pháp về mặt kết cấu, giải pháp về vật liệu phù hợp. Bài báo trình bày kết quả nghiên cứu các mô hình số mô phỏng tải trọng nổ lên kết cấu bê tông cốt thép sử dụng phần mềm phần tử hữu hạn Abaqus. Ba mô hình số mô phỏng tải trọng nổ được sử dụng trong phần mềm Abaqus được nghiên cứu gồm: Phương pháp không lưới (SPH), phương pháp sử dụng khối nổ tương đương và phương pháp kết hợp Lagrangian – Eulerianian. Kết quả nghiên cứu mô phỏng số và thực nghiệm được thực hiện trên tấm bê tông cốt thép có kích thước 1000x1000x60mm. Tải trọng nổ nghiên cứu là thuôc nổ TNT được đặt cách mặt thoáng của tấm bê tông cốt thép 5cm. Bê tông được mô phỏng tuân theo mô hình Johnson–Holmquist-II (JH-2). Mô hình đàn dẻo được sử dụng để mô phỏng cốt thép. Sự hư hại và phá hủy ở mặt trên, mặt dưới và ứng xử cơ học của các mẫu thí nghiệm dưới tác động của tải trọng nổ được phân tích và so sánh giữa thí nghiệm và mô phỏng để đánh giá hiệu quả của các mô hình sử dụng
Giải pháp phát triển điểm trung chuyển hành khách công cộng tại Thành phố Hồ Chí Minh
Authors: Nguyễn Thị Bích Hằng , Nguyễn Văn Dũng
Published: April 2024

Trong mạng lưới tuyến vận tải hành khách công cộng dạng “tuyến trục-tuyến nhánh” (Hub and Spoke Network), các điểm trung chuyển hành khách đóng vai trò rất quan trọng để vận hành có hiệu quả hệ thống vận tải. Kết cấu mạng lưới tuyến có thể bị thay đổi hoặc phá vỡ nếu khả năng xây dựng điểm trung chuyển gặp khó khăn trong thực tế. Trong bối cảnh từ nay đến năm 2030, Thành phố Hồ Chí Minh sẽ tái cấu trúc mạng lưới tuyến vận tải hành khách công cộng từ dạng “điểm nối điểm” (Point-to-Point Network) sang dạng “tuyến trục-tuyến nhánh” (Hub and Spoke Network) thì việc xây dựng các điểm trung chuyển hành khách trở nên cấp thiết. Bởi vì, khả năng xây dựng các điểm trung chuyển hành khách sẽ ảnh hưởng đáng kể đến kết quả của quá trình tái cấu trúc mạng lưới tuyến vận tải hành khách công cộng. Bài báo này sẽ phân tích các quy định pháp lý hiện hành về quy hoạch và quản lý trong các lĩnh vực: phát triển đô thị, sử dụng đất và giao thông nhằm xác định các khó khăn, trở ngại trong xây dựng, vận hành các điểm trung chuyển hành khách tại thành phố Hồ Chí Minh và đề xuất các giải pháp khắc phục. Các giải pháp này bao gồm: lựa chọn vị trí, loại hình, chức năng của các điểm trung chuyển phù hợp với điều kiện cụ thể của thành phố và những điều chỉnh cần thiết về thể chế chính sách trong quy hoạch và quản lý xây dựng tạo cơ sở pháp lý để xây dựng các điểm trung chuyển hành khách tại thành phố Hồ Chí Minh
Xây dựng chương trình kiểm định giả thuyết thống kê phi tham số trong đánh giá độ tin cậy của phương tiện đường sắt
Authors: Nguyễn Đức Toàn , Đỗ Đức Tuấn
Published: April 2024

Trong quá trình đánh giá độ tin cậy của các đối tượng nói chung và phương tiện đường sắt nói riêng, cần xác định các đặc trưng của mẫu như giá trị trung bình, phương sai, độ lệch chuẩn, hệ số biến động v.v. Khi sử dụng mẫu được chọn ra từ một tổng thể, các đặc trưng này được sử dụng để ước lượng các đặc trưng tương ứng của tổng thể, ngoài ra chúng còn được coi là một giả thuyết và cần phải đánh giá xem một giả thuyết nào đó của tổng thể là đúng hay sai. Việc tìm ra kết luận để bác bỏ hay chấp nhận một giả thuyết được gọi là kiểm định giả thuyết. Bài toán kiểm định giả thuyết thống kê là một bài toán lớn và quan trọng của thống kê toán học, bao gồm kiểm định giả thuyết thống kê có tham số và phi tham số, được ứng dụng rộng rãi trong nhiều lĩnh vực. Tuy nhiên, việc ứng dụng các phương pháp này trong đánh giá độ tin cậy của các đối tượng cơ khí nói chung và phương tiện đường sắt nói riêng cho từng trường hợp cụ thể, còn ít được đề cập. Vì vậy, trên trên cơ sở lý thuyết kiểm nghiệm giả thuyết thống kê phi tham số, đã tiến hành xây dựng các chương trình tính toán tương ứng và ứng dụng các chương trình đó cho một số bài toán cụ thể trong quá trình đánh giá độ tin cậy của phương tiện đường sắt
So sánh hiệu quả giảm chấn của thiết bị cản gắn bên trong và gắn bên ngoài dây văng có xét đến độ cứng chống uốn của dây văng
Authors: Nguyễn Duy Thảo
Published: April 2024

Để hạn chế dao động dây cáp văng trong cầu dây văng, các thiết bị giảm chấn cơ học được gắn thêm vào dây. Các thiết bị giản chấn nhớt thường được gắn giữa dây văng và bản mặt cầu (thiết bị cản gắn bên ngoài), trong khi đó thiết bị cản cao su thường được gắn giữa dây cáp văng và bên trong ống dẫn hướng của dây cáp văng (thiết bị cản gắn bên trong). Hiệu quả giảm dao động của hai dạng thiết bị này là hoàn toàn khác nhau. Bài báo trình bày các kết quả nghiên cứu dao động dây cáp văng với hai mô hình gắn thiết bị cản nhớt và cản cao su. Độ tin cậy của kết quả nghiên cứu được kiểm chứng với các kết quả của các tác giả khác đã công bố trước đây. Tiến hành khảo sát, so sánh hiệu quả giảm dao động của thiết bị cản gắn nhớt và cao su, từ đó đưa ra các khuyến cáo về việc áp dụng hai loại thiết bị cản này. Bài báo cũng tiến hành phân tích ảnh hưởng của các thông số của các thiết bị cản, độ cứng chống uốn của dây đến tỷ số cản của dây cáp văng, qua đó có thể giúp các kỹ sư thiết kế lựa chọn được các thông số tối ưu của các thiết bị cản
BRAZILIAN PARA-POWERLIFTING TRAINING PROFILE DURING THE COVID-19 PANDEMIC
Authors:   Universidade Estadual de Campinas, School of Physical Education, Applied Kinesiology Laboratory, Peixoto de Lucena Erick Guilherme , Lopes da Silva Valdecir ,   Comitê Paralímpico Brasileiro, Lima dos Santos Wéverton ,   Comitê Paralímpico Brasileiro, Rodrigues da Silva Carlos Williams ,   Universidade Federal de Sergipe, Study and Research Group on Performance, Sport, Health and Paralympic Sport, Aidar Felipe José ,   Universidade Federal de Sergipe, Study and Research Group on Performance, Sport, Health and Paralympic Sport,   Universidade Federal de Sergipe, Department of Physical Education, Arsenio Spina Murilo ,   University of Quebec in Montreal, Department of Physical Activity Sciences, Uchida Marco Carlos ,   Universidade Estadual de Campinas, School of Physical Education, Applied Kinesiology Laboratory
Published: April 2024

Introduction: The COVID-19 pandemic has caused a closure of training facilities due to government restrictions and social distancing, impacting amateurs and professional athletes. Objective: The purpose of this study was to describe the profile training of Brazilian Paralympic Powerlifters before and during the COVID-19 pandemic and verify the differences between international and national level athletes. Methods: Brazilian Paralympic Powerlifters (n=49) completed a self-reported online survey about training practices before and during the COVID-19 pandemic, motivation, satisfaction, and self-performance perception. Results: Paralympic Powerlifters have 34±10.6 years old, 156.5±20.8 cm, and 81.9±86.2 kg. Mann-Whitney test shows that international level athletes (i.e. Paralympic Games, Parapan American Games, and World Championship) had significantly more sport experience (years) compared to national level athletes (U=153.500; p=0.009). 83.7% of athletes reported being engaged in training during the COVID-19 Pandemic with changes in training location, training equipment, and coaching. Of the athletes who continue training, 65.9% reported feeling motivated to training, 34.1% reported not feeling motivated (=12.071; p<0.001). A significant association between training motivation (=13.359; p=0.001) and satisfaction (=13.435; p=0.001) with their self-performance perception were found. Conclusion: Most athletes reported being engaged in training during the COVID-19 Pandemic with significant changes in training location, equipment, and coaching. Understanding the changes in training practices during restriction periods, such as the COVID-19 pandemic, supports strategies to maintain the athlete’s engagement in Paralympic Powerlifting.
LONG-TERM VARIABILITY OF OCEANIC ZOOPLANKTON BIOMASS
Authors:   Sevastopol State University (SevSU), Piontkovski S. A. , Minsky I. A. ,   Sevastopol State University (SevSU), Meger Ya. V. ,   Sevastopol State University (SevSU)
Published: April 2024

Numerous scientific publications are dedicated to the analysis of long-term variability of zooplankton biomass in oceanic and neritic zones of the World Ocean. The number of these publications keeps growing with the availability of new data. Relevance of this research can be attributed to the crucial role of zooplankton biomass in the spatio-temporal and trophic structure of aquatic ecosystems. Inter-annual fluctuations of zooplankton biomass affect the catch volumes of small pelagic fish. This research is aimed at identification of statistically valid long-term trends of the World Ocean zooplankton biomass, which involves the analysis of the data from databases and published articles describing such variability. Regional and international databases (namely COPEPOD, HOT, JGOFS, ODATE and others), which are available in the form of CDs, archived materials, and online, have been used. For the time series of the biomass across 21 areas of the World Ocean (Pacific, Indian, Atlantic Oceans and internal seas), the regression analysis has been conducted, which made it possible to estimate the parameters of linear monotonic trends. Based on bivariate spatial autocorrelation functions, the areas within which the trends are statistically homogeneous have been identified. A comparative study of long-term variability of zooplankton biomass, phytoplankton biomass, primary production, and the total live biomass of the pelagic World Ocean is presented. It is shown that the spatial distribution of positive, negative and neutral trends of zooplankton biomass on the World Ocean scale is heterogeneous. The negative monotonic trends of zooplankton biomass are found to be prevailing (in 1980–2010s); the regression parameters describing them are presented.
HYDROBIOLOGICAL COMMUNITIES OF THE MIDDLE REACHES OF THE LENA RIVER
Authors:   Russian Federal Research Institute of Fisheries and Oceanography, Yakutsk Branch of the FSBSI “VNIRO” (“YakutskNIRO”), Sidorova L. I. , Gorokhova E. S. ,   Russian Federal Research Institute of Fisheries and Oceanography, Yakutsk Branch of the FSBSI “VNIRO” (“YakutskNIRO”), Kolodeznikova Y. N. ,   Russian Federal Research Institute of Fisheries and Oceanography, Yakutsk Branch of the FSBSI “VNIRO” (“YakutskNIRO”)
Published: April 2024

The investigated site is located within the area of the Yakutsk Urban District and subjected to a high anthropogenic load. The construction of a bridge over the Lena River at its middle reaches is crucial for transport accessibility but will have a negative impact on aquatic bioresources and their habitat. Previously, this section of the river has not been studied, so the results will be indicative of the current state of aquatic biological resources and their habitat. This factor determined the aim of this study: the status assessment of the hydrobionts inhabiting a localized area in the middle reaches of the Lena River. The hydrochemical analysis of water samples has been carried out in the laboratory of the Republican Center for Information, Analysis and Environmental Monitoring (State Budgetary Institution “RIATSEM”); collection and laboratory processing of zooplankton and zoobenthos samples have been conducted according to generally accepted methods. The hydrochemical composition and dissolved gases of the aquatic environment in the localized section of the Middle Lena River in the vicinity of the bridge crossing are favorable for the development of organic life. Zooplankton is represented by 54 species, more than a half of which is comprised by rotifers (52 %). The average biomass of zooplankton in the spring and summer seasons was 1.135 g/m3; in the autumn and winter seasons it was 0.057 g/m3, and the average annual value was 0.238 g/m3. Crustaceans have the highest share in the biomass, and rotifers are the most abundant. Zoobenthic organisms are represented by 9 groups; oligochaetes and chironomid larvae prevail throughout the year. The average biomass of the zoobenthos in the area along the shore was 37.41 g/m2; in the auxiliary streams it was 174.84 g/m2, and in the main course it was 3.52 g/m2. Following the results of this study, the qualitative and quantitative characteristics of the invertebrates have been found to be indicative of a favorable state of their habitat.
MACROPHYTES OF THE GENUS POTAMOGETON AS THE BIOINDICATORS FOR THE ACCUMULATION OF HEAVY METALS
Authors:   Astrakhan State Technical University (ASTU), Kuanova A. S. , Litvinova N. V. ,   Astrakhan State Biosphere Reserve named after Order of the Red Banner of Labour, Ershova T. S. ,   Astrakhan State Technical University (ASTU), Zaytsev V. F. ,   Astrakhan State Technical University (ASTU), Shaboyants N. G. ,   Astrakhan State Medical University (ASMU)
Published: April 2024

This work presents the investigation of the content of some heavy metals in the pondweeds of the Lower Volga River Delta within the area of Astrakhan State Biosphere Reserve. Higher aquatic plants extract chemical elements both from bottom sediments and water column. Moreover, the macrophytes, namely the representatives of Potamogeton genus, are capable of extraction and accumulation of the metals dissolved in the water, contained in the suspended colloidal particles, and present on the surface of leaves. This work is aimed at the identification of species-specific features of the typical hydatophytes—aquatic plants of Potamogeton genus—pertaining to the accumulation of heavy metals. The content of chemical elements in the investigated specimens has been identified using atomic absorption spectrometry; the results have been processed with statistical methods. It has been found that all investigated plant species accumulate iron and manganese in the highest quantities and cobalt and cadmium in the lowest. The investigated pondweed species have shown species-specific properties in the accumulation of chemical elements. Potamogeton crispus and Potamogeton lucens are found to be iron concentrating species. Potamogeton lucens also accumulates nickel, iron and manganese, and Potamogeton pectinatus accumulates chrome, cobalt and lead.
CHARACTERIZATION OF THE BELUGA BREEDING PRACTICES AT THE DON STURGEON HATCHERY
Authors:   Russian Federal Research Institute of Fisheries and Oceanography (FSBSI “VNIRO”), Azov-Black Sea Branch of the FSBSI “VNIRO” (“AzNIIRKH”), Vorobyeva O. A. , Gorbenko E. V. ,   Russian Federal Research Institute of Fisheries and Oceanography (FSBSI “VNIRO”), Azov-Black Sea Branch of the FSBSI “VNIRO” (“AzNIIRKH”), Sergeeva S. G. ,   Russian Federal Research Institute of Fisheries and Oceanography (FSBSI “VNIRO”), Azov-Black Sea Branch of the FSBSI “VNIRO” (“AzNIIRKH”), Pavlyuk A. A. ,   Russian Federal Research Institute of Fisheries and Oceanography (FSBSI “VNIRO”), Azov-Black Sea Branch of the FSBSI “VNIRO” (“AzNIIRKH”), Khorosheltseva V. N. ,   Russian Federal Research Institute of Fisheries and Oceanography (FSBSI “VNIRO”), Azov-Black Sea Branch of the FSBSI “VNIRO” (“AzNIIRKH”)
Published: April 2024

The study conducted in 2022 has identified a lack of consistency in the results of the beluga artificial reproduction at the Don Sturgeon Hatchery (DSH). To obtain eggs, mostly the females born in 2001–2004 were used, out of which 31 females at age 18 reached their first maturity and one female at age 21 was a repeat spawner. The majority of first-spawning females produced eggs of low quality. During incubation, there was a substantial loss of fertilized eggs, and various anomalies of embryonic development were observed, which necessitated termination of the incubation of such eggs. The yield of one-day larvae from the eggs obtained from the first-spawning females and set for incubation was low, around 12 %. One of the reasons for the increased mortality rates and development anomalies in the larvae was low quality of the oocytes in the first-spawning individuals. A second-spawning female has shown satisfactory results; the fertilization rate was in line with the standard values, and no more than 17 % of the eggs manifested embryonic anomalies during their incubation. The yield of one-day larvae was 53.3 %. In total, 799 thousand one-day beluga larvae were obtained. The analysis of the cultivation practices at the Don Sturgeon Hatchery made it possible to identify the bottleneck points and critical junctures at some stages of the biotechnological process, as well as to give recommendations on improvement of the hatchery operation. An important prerequisite for obtaining good results is the physiological adequacy of beluga females, which is based, for the most part, on the living environment and feeding quality of the breeders and their replacement in the broodstock.
FLUCTUATING ASYMMETRY OF THE HEAD SEISMOSENSORY CANALS IN ROACH RUTILUS RUTILUS (L.) FROM THE MIDDLE RIVERS OF UDMURTIA WITH DIFFERENT LEVELS OF CHEMICAL POLLUTION
Authors:   Russian Federal Research and Technological Institute of Biological Industry (“VNITIBP”), Kotegov B. G.
Published: April 2024

In the middle rivers of the Udmurt Republic, fish were caught near the sampling stations for the state environmental monitoring. The fluctuating asymmetry (FA) of the pore number of the seismosensory canals in the dermal head bones of the roach, Rutilus rutilus (L.), which prevailed in the catches, was estimated using osteological analysis. Its indicators in the roach individuals caught in the different river sections have been collated with the values of specific combinatorial water pollution index (SCWPI) of the examined sections and with the average concentrations of some pollutants in water in late spring and early summer for the several years preceding the years of catching. A statistically significant trend for the increase in the FA variance (Sas2), calculated on the basis of the total number of pores in the head seismosensory system of the roach, with the increase in the SCWPI and the content of some anions (chlorides, nitrites, nitrates) in the river water of its habitats has been identified. The highest (Sas2) was observed in the roach individuals caught in the Izh River dowstream from Izhevsk in the environment, severely polluted by municipal wastewater, while the lowest one was recorded in the Kilmez River, the least polluted by wastewaters. No significant relationships between the FA indicators in this fish species and the content of heavy metals or other pollutants in the middle rivers of Udmurtia have been revealed. These results are considered to be attributable to a decrease in stability of morphogenesis in the fish organisms that developed under non-optimal (stressful) hydrochemical conditions.