bluuebunny/crossref_metadata_2025_split huggingface dataset:
Đặc điểm dinh dưỡng của cá sửu răng nhỏ Panna microdon (Bleeker, 1849) ở Đồng bằng sông Cửu Long
Authors: Nguyễn Thị Vàng , Nguyễn Văn Mừng , Trương Hoàng Dinh , Định Trần Đắc 
Published: September 2021

Cá sửu răng nhỏ (Panna microdon) là một trong những loài có giá trị kinh tế cao do thịt ngon, thường được bán tươi, làm khô. Nghiên cứu đặc điểm dinh dưỡng của cá sửu răng nhỏ được thực hiện từ tháng 6 năm 2019 đến tháng 4 năm 2020 tại vùng ven biển tỉnh Sóc Trăng và Cà Mau. Mẫu cá với các kích cỡ khác nhau được thu bằng lưới kéo. Kết quả nghiên cứu cho thấy cá sửu răng nhỏ có miệng rộng, rạch miệng xiên, răng nhọn, lược mang thưa và ngắn, thực quản ngắn có vách dày dạng hình ống, dạ dày hình túi, manh tràng có từ 3 đến 8 ống, ruột ngắn dạng hình chữ S. Chỉ số sinh trắc ruột - RLG < 1 cho thấy cá sửu răng nhỏ có tính ăn động vật. Thành phần thức ăn chủ yếu trong dạ dày của cá sửu răng nhỏ là cá, tôm, tôm tít, ruốc, cua/ghẹ và các loại thức ăn khác. Kết quả cũng cho thấy không có sự thay đổi thành phần thức ăn của cá sửu răng nhỏ ở các kích cỡ khác nhau.
Nghiên cứu sự phát triển ống tiêu hóa của cá lóc (Channa striata) từ giai đoạn bột đến 35 ngày tuổi
Authors: Hiền Trần Thị Thanh , Ngô Minh Dung , Nguyễn Thị Long Châu , Trương Thị Tú Nga , Liêm Phạm Thanh 
Published: September 2021

Nghiên cứu sự phát triển về hình thái và cấu trúc mô ống tiêu hóa của cá lóc được thực hiện từ khi mới nở đến 35 ngày tuổi nhằm xác định thức ăn phù hợp cho cá lóc trong giai đoạn này. Cá bột 3 ngày tuổi được cho ăn Moina sp., đến ngày tuổi thứ 10 Moina sp. được thay thế dần bằng cá tạp, và đến ngày tuổi thứ 17 cá tạp được thay thế bằng thức ăn chế biến. Mẫu cá được thu vào buổi sáng trước khi cho ăn vào các ngày 1, 3, 5, 7, 9, 12, 15, 18, 21, 25, 30 và 35 để phân tích các biến đổi về hình thái và cấu trúc mô của ống tiêu hóa. Kết quả khảo sát cho thấy từ khi mới nở đến ngày tuổi thứ 3, ống tiêu hóa chỉ là một ống thẳng chưa phân hóa thành các phần chức năng. Ống tiêu hóa phân chia thành khoang miệng, thực quản, vùng dạ dày và ruột vào ngày thứ 5. Ruột bắt đầu gấp khúc và không bào lipid xuất hiện vào ngày thứ 7. Tuyến dạ dày xuất hiện vào ngày thứ 12 cho thấy sự hoàn thiện của ống tiêu hóa cả về hình thái và chức năng. Các biến đổi về sau chủ yếu là sự gia tăng các nếp gấp niêm mạc của ống tiêu hóa, chủ yếu là ở dạ dày và ruột sau của cá lóc...
KAJIAN MANAJEMEN KEBUTUHAN TRANSPORTASI PADA ZONA PERTUMBUHAN EKONOMI DAERAH KECAMATAN JATI AGUNG KABUPATEN LAMPUNG SELATAN
Authors: Nazir Mohammad , Karami Muhammad , Sulistyorini Rahayu 
Published: September 2021

Kabupaten Lampung Selatan mempunyai beberapa tujuan pembangunan perekonomian daerah seperti: pengembangan sentra produksi dan pelayanan; pengembangan kawasan usaha menengah kecil (UKM), pengembangan sektor properti dan konstruksi, pengembangan agribisnis dan agroindustri, serta pengembangan kawasan pariwisata. Kecamatan Jati Agung adalah daerah perbatasan antara Kabupaten Lampung Selatan dengan kota Bandar Lampung, sehingga pertumbuhan ekonomi di daerah tersebut meningkat, manajemen kebutuhan tranportasi pada zona wilayah khususnya pada Kecamatan Jati Agung sangat dibutuhkan , seiring dengan meningkatnya pembangunan diderah tersebut seperti jalan Tol Trans Sumatra, Institut Teknologi Sumatra (ITERA), Pengembangan kota baru dan lain sebagainya. Dengan pertumbuhan ekonomi yang meningkat menyebabkan mobilitas seseorang meningkat sehingga kebutuhan pergerakannya pun meningkat melebihi kapasitas sistem prasarana transportasi yang ada. Kurangnya investasi pada suatu sistem jaringan dalam waktu yang cukup lama dapat mengakibatkan sistem prasarana transportasi tersebut menjadi sangat rentan terhadap kemacetan yang terjadi apabila volume arus lalu lintas meningkat lebih dari rata – rata.Variasi arus dalam waktu pada zona wilayah bangkitan perjalanan (wilayah study) adalah dengan terjadinya perubahan kecepatan tempuh rata – rata (LV) saat survey lapangan (V1) yaitu 47,502 km/jam dengan nilai rasio derajat kejenuhan 0,186, dan pada saat ditambahkan angkutan hasil panen produksi tanaman pangan dan perkebunan (bangkitan perjalanan) (V2) adalah 42.5 km/jam dengan nilai rasio derajat kejenuhan taksiran 0,252 meningkatkan fasilitas perlengkapan jalan untuk keselamatan, dan untuk mengurangi tingkat kecelakaan lalu lintas di jalan raya.
MODEL PROBLEM BASED LEARNING DAN MOTIVASI TERHADAP PENINGKATAN HASIL BELAJAR BIOLOGI PESERTA DIDIK
Authors: Bakti Hudaya Indra , Santoso Handoko 
Published: September 2021

Abstrak : Keberhasilan suatu proses belajar mengajar dipengaruhi oleh berbagai faktor. Dalam penelitian ini terdapat dua faktor yang mendominasi yaitu model pembelajaran dan motivasi yang dimiliki siswa saat belajar. Dengan menerapkan model pembelajaran yang tepat akan membuat kegiatan belajar mengajar lebih menarik sehingga menarik rasa ingin tahu siswa untuk belajar. Rasa ingin tahu merupakan motivasi alami yang dimiliki oleh siswa, sehingga mereka tertarik untuk mengikuti proses pembelajaran. Dalam penelitian ini model yang akan digunakan adalah Problem Based Learning atau dikenal dengan Problem Based Learning (PBL). Model pembelajaran ini berorientasi pada siswa, dimana guru akan memberikan objek permasalahan yang berkaitan dengan materi dan siswa akan diminta untuk menganalisis penyelesaian masalah tersebut dengan menggali berbagai informasi baik dari buku, internet ataupun hasil siswa. Sedangkan guru hanya berperan sebagai fasilitator dan mengarahkan siswa. Tujuan dari artikel review ini adalah (1) untuk mengkaji model Problem Based Learning (2) mempelajari hasil belajar (3) untuk mengkaji model Problem Based Learning dalam meningkatkan hasil belajar.
Abstract: The success of a teaching and learning process is influenced by various factors. In this study, there are two factors that dominate, namely the learning model and the motivation that students have when learning. By applying the right learning model, it will make teaching and learning activities more interesting so that it attracts students' curiosity to learn. Curiosity is a natural motivation possessed by students, so they are interested in participating in the learning process. In this study, the model to be used is Problem Based Learning or known as Problem Based Learning (PBL). This learning model is oriented towards students, where the teacher will provide an object of problems related to the material and students will be asked to analyze the resolution of the problem by exploring a variety of information both from books, the internet or students' results. Whereas the teacher only acts as a facilitator and directs students. The purpose of this review article is (1) to examine the Problem Based Learning model (2) to study the learning outcomes (3) to examine the Problem Based Learning model in improving learning outcomes.
Transhumanismo bioprogresista extropianista, posthumanismo y bioconservadurismo a la luz del concepto de naturaleza de santo Tomás de Aquino
Authors: Ocampo Ponce Manuel 
Published: September 2021

Aunque el auge del transhumanismo progresista extropianista que apunta a un posthumanismo se ha desarrollado en las últimas tres décadas, es fácil ver que se trata de un asunto del pasado, del presente y del futuro. Es un hecho que desde que el hombre empezó a intervenir en la naturaleza ha superado muchas fronteras impuestas por su precariedad. Ya Aristóteles se había referido al hombre como homo faber. No obstante, frente a los avances tecnológicos, últimamente ha surgido una respuesta a las propuestas de los transhumanistas por parte de los que se han llamado bioconservaduristas. Ambos puntos de vista coinciden en que no todo lo que se puede llamar “mejoras” al ser humano, tiene el mismo estatuto ontológico y moral. También resulta interesante ver si es posible que el transhumanismo llegue a un extropianismo o a un posthumanismo, lo cual conduce el discurso científico a un plano filosófico. El propósito de este trabajo es descubrir los alcances y los límites ontológicos de este movimiento, a partir del concepto de naturaleza desarrollado por santo Tomás de Aquino, cuya propuesta es clásica y perenne. Veremos cómo el concepto de naturaleza en santo Tomás nos arroja luz para responder las interrogantes que últimamente se han planteado los intelectuales de este movimiento filosófico, científico y cultural.
Ergonomic Aspects of Choosing Children’s Robotics for the Smallest Children and Preschool Children
Authors: Marková Petra , Prajová Vanessa 
Published: September 2021

Abstract
At present, there are a large number of manufacturers operating on the market, which are engaged in the production and distribution of mechatronic and robotic toys. These toys range from the cheapest and simplest to sophisticated costly models for play education. Looking at the market offer, it can be stated that mechatronic toys are being produced, which are intended for children of several months. When developing children’s and educational robotics, it is, therefore, necessary to take into account the psychomotor development of the child. Respecting or not respecting it has a major impact on the success of the toy for the consumer and the fulfillment of the educational goal for which it is intended. Last but not least, in connection with the child’s development, the question arises as to what ergonomic principles, when designing toys intended for children depending on age, need to be respected and implemented into solutions to eliminate problems related to the development of children’s and educational robotics. The subject of interest in the article is the age groups of children from birth to preschool age. The aim of the article is to identify which factors in the construction of children’s robotic toys for the youngest children up to the period of preschool age are key from the point of view of ergonomics.
Visual Monitoring as a Tool in Industrial Security Engineering. Case Study
Authors: Ignac-Nowicka Jolanta 
Published: September 2021

Abstract
The article presents the use of video monitoring in a production company on the example of municipal thermal power plant. After analyzing the hazards and work inconvenience occurring in the analyzed enterprise, video surveillance zones have been designated with the division into the indoor and outdoor monitoring system. Video surveillance is provided for production, auxiliary and delivery processes. Moreover, video monitoring performs a control function over the occupation health in workstations at risk of explosion or fire. In addition, observation points have been set up in the visual monitoring system, among which the internal ones are served by the dispatcher responsible for the production process, while the external are operated by security guards of the facility.
Using FCAW with Electrodes Based on Fe-Ti-Mo-B-C System for Increasing of Durability of Junk Removal Tools
Authors: Ivanov Olexandr , Prysyazhnyuk Pavlo , Romanyshyn Liubomyr , Romanyshyn Taras , Mosora Yurii 
Published: September 2021

Abstract
In this work were analyzed factors and working conditions that leads to the wearing of junk mills tools that are a part of junk removal equipment used in drilling and workover of borehole. Such equipment is a part of oil and gas industry and work under condition of intense abrasive wearing with increased pressures and cyclic loads. Was established that traditional hardfacing materials based on the Fe-Cr-C system are not effective for improvement of abrasion resistance of elements of such equipment due to their low crack resistance and low hardness of chromium carbides. The aim of this work was to increase a durability of that equipment by using of flux cored electrodes with reaction components of pure metal powders, which leads to forming the fine-grained structure with increased hardness. Powders of Ti, Mo, B4C and their combinations were used. Structures of the hardfacing coatings were investigated by method of metallography, scanning electron microscopy (SEM). Abrasion wear tests were held under condition of fixed and non-fixed abrasion. Using of pure metal powders led to formation of a fine-grained structure with grains of Mo2FeB2 that forms around TiC, which work as modifier. It was investigated that the researched material based on Fe-Ti-Mo-C-B system that was used for increasing the wear resistance of junk mills led to increasing of the TBO period in 1.5-1.6 times comparing with serial hardfacing materials based on tungsten.
Global Trends in the Development of Battery-Powered Underground Mining Machines
Authors: Bołoz Łukasz 
Published: September 2021

Abstract
The growing requirements and needs of users as well as a strong emphasis on pro-ecological solutions cause an increasing interest in battery-powered electric mining machines. Internal combustion machines consume oxygen, generate noise, fumes and heat, which affects work in underground mines, and minimizing these factors is expensive. Battery solutions allow achieving the same operational parameters of machines with significantly higher safety, comfort and work culture. The problem, however, is their range or working time. The article presents global trends in the development of battery-operated machines for underground mining. Various machines in battery-powered versions have been presented. The applied solutions have been discussed, especially in the field of battery replacement or recharging and braking energy recovery. Manufacturers around the world offer more and more battery-powered machines. Some producers are announcing complete replacement of combustion solutions with electric ones within the next few years. There are also hydrogen machines on the horizon, which will probably be the next step on the road to a zero-emission industry.
Building a Circular Economy Model for Managing Exploitation of Household Used Devices on the Example of Washing Machine Driven by DC Motor Along with Components
Authors: Saleem Usman , Kaźmierczak Jan 
Published: September 2021

Abstract
In the article, the authors describe, using the example of a selected class of technical means, their concept of replacing the “classical” linear management (exploitation) model with a circular economy (CE) model. An example of an object for which the authors plan to test the feasibility of the concept presented above is a household washing machine driven by a DC motor. The description of this object included in the article considers its complexity and multiplicity of assemblies, sub-assemblies, and elements. The DC electric motor driving the washing machine was considered the most important from the point of view of the created model, especially in terms of the possibility of maintenance and repair. For such an engine, the article presents the maintenance and disposal model as elements of the concept of building a ‘circular’ business model. The authors assumed that the formal basis for such a model would be the so-called circular model. The methodology and plan of the research carried out at Super Asia washing machine company in Pakistan were introduced, and the research results were shown. With the use of these results, an attempt was made to assess the requirements that the application of the CE business model places on manufacturers of a selected class of devices, both in their manufacture, repair, sharing and dematerialization. The concept of further research is described at the end of the article.
Operational Tests of a Modular Installation and Transport Assembly of Steel Arch Support in Underground Excavations
Authors: Krauze Krzysztof , Mucha Kamil , Wydro Tomasz , Kutnik Andrzej , Hałas Waldemar , Ruda Piotr , Osowski Dawid 
Published: September 2021

Abstract
The roof support, especially the ŁP yielding steel arch support, is transported and assembled in the face with the use of auxiliary machines. This activity in Polish underground mines causes numerous problems, which until present have not been solved. Currently, transport and assembly are carried out manually, while the roadheader and suspended rail are used only to a small extent. Therefore, the modular installation and transport assembly was developed jointly by FAMA Sp. z o. o. and AGH University of Science and Technology. The solution in question enables performing a number of functions (including transport and assembly of all kinds of support arches), which are not available in currently manufactured equipment. The proposed manipulator solves numerous problems occurring during the installation of the steel arch support in an underground mining excavation and significantly improves the process of drilling galleries. This innovative solution considerably differs from the existing ones, and its greatest advantage is versatility with regard to the cross-section and equipment of the roadway, as well as a wide range of functions. In addition, it can also be used for reloading works. The modular installation and transport assembly together with a platform, a temporary mechanized roof support and a mining machine, make up a mechanizes roadheader complex, which enables continuous mining, loading and installing the permanent support in underground workings.
Statistical and Econometric Analysis of Selected Effects of COVID-19 Pandemic
Authors: Kempa Wojciech , Rydarowska-Kurzbauer Joanna , Halama Marzena , Smuda Elżbieta , Biel Maciej 
Published: September 2021

Abstract
The paper examines the impact of the COVID-19 pandemic on macroeconomic activity in the selected European countries. The studies are based on monthly and quarterly indicators of GDP, unemployment rates and key indicators of the tourism sector. To present how COVID-19 has affected these macroeconomic variables, statistic data from the three periods are compared. Namely, data are collected from the pre-pandemic period, i.e. the fourth quarter of 2019 as the reference period, the second period covers the first quarter of 2020 and means the beginning of the pandemic, and the third one covers second quarter of 2020, during which the pandemic has spread to all the analyzed countries. The following statistical techniques are used in the research: regression analysis, the hierarchical grouping of agglomerations, k-means method, and selected non-parametric tests (Kruskal-Wallis test for a selected group of countries and Kolmogorov-Smirnov test for a selected pair of countries). The results show the significant impact of the pandemic on the level of gross domestic product, unemployment rate and turism sector. In most cases, a correlation between incidence of COVID-19 infections, unemployment rate and GDP is observed. The statistical techniques also allow to demonstrate the similarities and differences in the response of the economies to the COVID-19 pandemic. Central Statistical Offices of the selected countries are the main data source and for all calculations Statistica version 13.3. is used.
Technological Capabilities of Well Cementing
Authors: Ivanova Tatiana N. , Zasadzień Michał 
Published: September 2021

Abstract
Cementing of casing string is a final operation before the next stage of well construction; it provides maximum operational life of the well. Cementing of casing string is carried out with the use of technology, based on squeezing of the whole volume of drilling mud by special grouting composition. The main purposes of cementing include isolation of water-bearing horizon, strengthening of borehole walls in unconsolidated and unstable rocks. Well cementing process is divided into five subsequent operations. Firstly, grouting mixture is prepared in concrete mixers (cementing units) with necessary water-to-cement ratio and additives. Secondly, prepared grouting solution is injected in a well. Thirdly, the solution is squeezed into the space between the casing pipes and wellbore walls. Then it is necessary to wait until the cement sheath is hardened. And at last, quality control is carried out. For convenient transportation, the equipment for well cementing is installed on the truck chassis (KAMAZ, URAL and etc.). All components are poured in concrete mixer, then the water is added and everything is being mixed until formation of uniform mass, which is later pumped in a well. Oil and Gas Industry Safety Regulations say that «calculated endurance of casing string cementing should not exceed 75% of time of cement thickening, established by laboratory tests». Therefore, it is necessary to carry out all operations of injection of fluids into the well as soon as possible without any incompliances of the cementing technology. With cementing material used and its water-to-cement ratio of 0.5, the average time of cement thickening is 120 minutes, according to laboratory tests. Therefore, a set of operations of injection of fluids should not exceed 90 minutes.
Cave and rock shelter sediments of southern Africa: a review of the chronostratigraphic and palaeoenvironmental record from Marine Isotope Stage 6 to 1
Authors: Stratford D. , Braun K. , Morrissey P. 
Published: September 2021

AbstractCaves and rock shelters contribute important records to local, regional and sub-continental reconstructions of environment and climate change through the southern African Quaternary. Against a backdrop of pronounced climate change, the archaeological record of the Marine Isotope Stage 6 to 1 period in southern Africa documents a remarkable time in the behavioural and technological evolution of anatomically modern humans. Significant evidence of this evolution is represented in diverse components of the sedimentary record in caves and rock shelters in the region. We present a catalogue of published caves and rock shelters in southern Africa that preserve temporally-relevant clastic and chemical palaeoclimatic proxies in order to: (1) facilitate the integration of cave and rock shelter sedimentary data into broader, regional chronostratigraphically-correlated palaeoclimatic sequences; and (2) identify possible areas and proxies that require focused research in the future. To demonstrate the complexity of the Marine Isotope Stage 6 to 1 stratigraphic record and use of palaeoenvironmental proxies, we present three case studies representing interior and coastal contexts: Border Cave, Klasies River Mouth and Pinnacle Point. These examples aptly demonstrate the challenges of these contexts, but also the opportunities for palaeoenvironmental research in southern Africa when conducted through integrated, multidisciplinary approaches. Published records of palaeoenvironmental research from cave and rock shelter sequences in southern Africa are heavily biased to the South African coastal areas and the record is temporally and spatially fragmented. However, there are interesting patterns in the chronostratigraphic record and in the distribution of sites within the context of the geology and vegetation ecology of southern Africa that require further exploration. There are also promising techniques in stable isotope analysis that can be applied to abundant sedimentary components found in the region’s caves and rock shelters, and in its museums.
Author Response to “Are Findings From a Pragmatic Dry Needling Trial Always Applicable in the Real World?”
Authors: Gattie Eric , Cleland Joshua A. , Pandya Jeevan , Snodgrass Suzanne 
Published: September 2021

Author response to the JOSPT Letter to the Editor-in-Chief “Are Findings From a Pragmatic Dry Needling Trial Always Applicable in the Real World?” J Orthop Sports Phys Ther 2021;51(9):471–472. doi:10.2519/jospt.2021.0202-R