bluuebunny/crossref_metadata_2025 huggingface dataset:
Morphological Characteristics of Different Ficus Species Found in Samaru-Zaria, Nigeria
Authors: Adamu F. U , Abubakar B. Y , Musa A. O.
Published: January 2022

The genus Ficus is an important genetic resource due to its high economic and nutritional values. It is also an important part of biodiversity in the rainforest ecosystem. The leaf shape is variable, even among the leaves on the same tree and such characters as acuminate tips and cordate bases are seldom constant. The research was aimed to determined the morphological characteristics of leaves from eight different Ficus species found in Zaria in wet and dry season. Macromorphological characters such as leaf type, leaf shape, leaf apex, leaf margin, leaf arrangement and leaf base were examined. Macromorphological characters show leaf arrangement to be alternate in all the species. The leaf apexes are acute, obtuse and Acuminate, with leaf base been cordate and obtuse, having a leaf margin of serrate, entire and scalloped, with the shapes of the leaf cordate, ovate and elliptic. Quantitative examination of the foliar characteristics in both wet and dry season showed a significant difference in the leaf number among all the species except for Ficus reliogosa, Ficus capensis and Ficus elastica having P values 0.938, 0.963 and 0.873 respectively. Leaf length also varies significantly among all species except for Ficus reliogosa, Ficus polita, F. platyphylla and F. natalensis while leaflet width also varies significantly among all the species except for Ficus platyphylla. Petiole length was also significant among the species except for Ficus elastica (P value 0.417) The findings from this research revealed that the macromorphological characteristics of Ficus species in Zaria during wet and dry season indicate a significant variation across species.

Keywords: Morphological, Foliar, Ficus species, Wet and dry season
Microscopic, Physicochemical and Phytochemical Evaluation of Stem bark of Aubrevillea kerstingii (Harms) Pellegr. (Mimosaceae)
Authors: Ahmed A. H. , Musa K. Y. , Ahmed A. , Mahmud A.F.
Published: January 2022

Microscopic, physicochemical and phytochemical evaluation gives detailed valuable information that is useful in determination of the identity, quality and purity of medicinal plants, crude drugs and herbal products. The research was carried out in order to determine the microscopic, physicochemical and phytochemical parameters of stem bark extract of Aubrevillea kerstingii. The macroscopic, microscopic, chemo-microscopic and physicochemical and preliminary phytochemical screening parameters were determined according to standard methods.The microscopic features revealed the presence of thin walled, radially arranged cork cells, well developed cortex, bundles of sclerenchymatous cells and numerous prismatic calcium oxalate crystals The chemo-microscopy of the powdered stem bark revealed the presence of some cell wall materials and cell inclusions. Physicochemical parameters determined in this study showed moisture content to be 8.2 ± 0.07, total ash value 9.23 ± 0.56, acid insoluble ash 1.49 ± 0.12, water soluble ash 5.52 ± 0.10, alcohol extractive value 26.50 ± 0.61 and water extractive value 33.4 ± 0.36. Preliminary phytochemical screening revealed the presence of saponins, triterpenes, flavonoids, tannins, alkaloids and carbohydrate. The parameters of stem bark of Aubrevillea kerstingii determined in this study will help in establishing the quality and purity of the plant.

Keywords: Aubrevillea kerstingii, Fabaceae, Physicochemical, Phytochemical
Nuclear protein 1 promotes unfolded protein response during endoplasmic reticulum stress, and alleviates apoptosis induced by cisplatin in non-small cell lung cancer cells
Authors: Sun Yinhui , Wang Lihuai , Deng Changqing , Liu Hua , Guo Zhongcong , Chang Zelin , Mo Jianxiong
Published: January 2022

Purpose: To investigate the role of nuclear protein 1 (NUPR1) in the drug resistance of non-small cell lung cancer (NSCLC) and its regulatory mechanisms.

Methods: Quantitative polymerase chain reaction (qPCR) and immunoblot assays were conducted to determine NUPR1 expression in A549 cells. Cisplatin sensitivity and cisplatin-induced apoptosis were investigated in NUPR1 knockdown or overexpressed cells via 3-(4,5-dimethylthiazol-2-yl)-2,5- diphenyltetrazolium bromide (MTT) assay and flow cytometry. The potential association between unfolded protein response (UPR) and NUPR1 levels in response to cisplatin were explored. The effect of endoplasmic reticulum (ER) stress on apoptosis was examined using flow cytometry.

Results: Cisplatin treatment promoted the expression of NUPR1 in NSCLC cells. NUPR1 regulated cisplatin resistance in NSCLC and also regulated UPR in ER stress induced by cisplatin. The results show NUPR1 regulated apoptosis induced by ER stress following tunicamycin treatment.

Conclusion: NSCLC cells may promote the UPR in ER stress by promoting the expression of NUPR1, thereby reducing the ER stress induced by cisplatin.
Assessment of Seasonal Variations in Forage Quality in Saanane Island National Park, Mwanza, Tanzania
Authors: Sangu George M. , Nahonyo Cuthbert L.
Published: January 2022

Seasonal variations in proteins, vitamin A, vitamin C, carbohydrates and minerals (Ca, Fe, Na, K and P) for seven most grazed and four most browsed plant species were assessed using laboratory analysis to determine what nutrient resources were available to grazers and browsers inhabiting the Saanane Island. The results indicated great seasonal variations in proteins, vitamin A, vitamin C and carbohydrates which were statistically significant with P < 0.01, F 3.444 at DF 5. Similarly, the minerals (Ca, Fe, Na, K and P) showed greater seasonal variations with K and P being higher during wet season, while Na and Fe were higher in dry season. The levels of proteins, vitamins, fibres and minerals were well above daily dietary requirements for grazers and browsers. These results suggested that both grazers and browsers were benefiting from seasonal differences in terms of available resources at disposal as animal health is regulated by levels of proteins and vitamins available in grazing and browsing materials. 

Keywords: Forage Quality, Minerals, Protein Saanane, Seasonality, Vitamin.
Anticipating the Effects of Increasing Rivers’ Water Salinity for Sustainable Conservation of Tilapia Resources in Rural Coastal Zone of Benin, West Africa
Authors: Amoussou Toundji O. , Millogo Vinsoun , Filipe Ana F. , Kunda Chibuye F. , Njé Dorothé Y. , Millogo Vinsoun , Alhassan Elliot H.
Published: January 2022

The current research aimed at using the application of multi-factor models to support fisheries management decisions for successful resources’ conservation. The study was based on the tilapia species Coptodon guineensis, which is among the most widely exploited in Benin coastal zone. In an attempt to suggest conservation strategies, the phenotypic variability of 356 accessions of this species was assessed in relation with water salinity, and several interactions. The fish were collected through small-scale experimental fishing using cast nets and gillnets. The findings indicated that the salinity observed in the sampled rivers is due, at proportions ranging from 0.13% to 47%, to the sea surface salinity (SSS) of the Atlantic Ocean, suggesting a leading inland origin of the salinity of these rivers. The evidence also showed that the tilapia populations have been relatively adapted to the increasing water salinity of the sampled rivers. The fish species*river type and fish species*fish sex interactions had significant effects on phenotypic characteristics rather than river type*fish sex interaction. For an efficient conservation of these populations, two conservation areas (Lake Nokoué and Porto-Novo lagoon vs Lake Toho and Grand-Popo lagoon), could be considered for this tilapia species.

Keywords: Aquatic salinization, population adaptation, growth parameters, interaction patterns
No-Go Theorems for Distributive Laws
Authors: Zwart Maaike , Marsden Dan
Published: January 2022

Monads are commonplace in computer science, and can be composed using Beck's
distributive laws. Unfortunately, finding distributive laws can be extremely
difficult and error-prone. The literature contains some general principles for
constructing distributive laws. However, until now there have been no such
techniques for establishing when no distributive law exists.
We present three families of theorems for showing when there can be no
distributive law between two monads. The first widely generalizes a
counterexample attributed to Plotkin. It covers all the previous known no-go
results for specific pairs of monads, and includes many new results. The second
and third families are entirely novel, encompassing various new practical
situations. For example, they negatively resolve the open question of whether
the list monad distributes over itself, reveal a previously unobserved error in
the literature, and confirm a conjecture made by Beck himself in his first
paper on distributive laws. In addition, we establish conditions under which
there can be at most one possible distributive law between two monads, proving
various known distributive laws to be unique.
An extensible equality checking algorithm for dependent type theories
Authors: Bauer Andrej , Komel Anja Petković
Published: January 2022

We present a general and user-extensible equality checking algorithm that is
applicable to a large class of type theories. The algorithm has a type-directed
phase for applying extensionality rules and a normalization phase based on
computation rules, where both kinds of rules are defined using the
type-theoretic concept of object-invertible rules. We also give sufficient
syntactic criteria for recognizing such rules, as well as a simple
pattern-matching algorithm for applying them. A third component of the
algorithm is a suitable notion of principal arguments, which determines a
notion of normal form. By varying these, we obtain known notions, such as weak
head-normal and strong normal forms. We prove that our algorithm is sound. We
implemented it in the Andromeda 2 proof assistant, which supports
user-definable type theories. The user need only provide the equality rules
they wish to use, which the algorithm automatically classifies as computation
or extensionality rules, and select appropriate principal arguments.
Application of mobile hydraulic anti - rigging complex in tunnels excavation and mining at the Mong Duong Coal Joint Stock Company - Vinacomin
Authors: Nguyen Khai Cao , Ngo Khuong Van ,   Faculty of Mining, Hanoi University of Mining and Geology, Vietnam  Vietnam National Coal - Mineral Industries Holding Corporation Limited, Vietnam
Published: January 2022

The strategy for Vietnam's coal industry in the period to 2030 is to continuously increase the mining output. In particular, the structure of shifting to coal mining by underground method will be essential. However, the increase in underground mining output is affected by many factors. Currently and in the future, almost all underground coal mines in Vietnam must expand their mining areas, apply advanced technology, to meet the increase in mining output. However, a long - standing problem that the underground coal mines in Quang Ninh have not improved much is speeding up the digging. This is one of the problems causing congestion in production when it is necessary to increase production. The article has studied the design and application of a mobile hydraulic anti - rigid complex for tunnel excavation and mining at Mong Duong Coal Company - Vinacom. This is a type of advanced technology in tunnel excavation and mining, which has been researched and applied in the world in recent years, in order to speed up the speed and ensure very effective safety. The application of a mobile anti - rigs in tunnel excavation will solve the current urgent requirement of speeding up the excavation progress by 30÷50% and ensuring labor safety. The article has researched and designed the excavation of a underground tunel through the seam at the in level - 400 m at Mong Duong Coal Joint Stock Company - Vinacomin. The underground tunnel the seam at the in level - 400 m is excavated underground tunnel with relatively typical conditions of underground coal mines in Quang Ninh region. The experimental design and application will be universal and increase the reliability of this type of advanced technology in the orientation of the underground coal mining industry in our country.
Ventilation solution to undergroud mining site in Cao Thang mine area, Hon Gai Coal Company
Authors: Nguyen Cuong Hong , Nguyen Khai Cao , Le Khai Van , Tran Thuc Van ,   Faculty of Mining, Hanoi University of Mining and Geology, Vietnam  Vietnam National Coal - Mineral Industries Holding Corporation Limited, Vietnam
Published: January 2022

Cao Thang coal mine of Hon Gai Coal Company is currently in the implementation phase of the underground mining project at level -50÷ -160 m. It is expected that by and after 2021, the mining coal output reaches double in 2019 (about 300,000 tons/year). On the basis of the assessing results of the current ventilation status in the mining area by auditing the wind network, when increasing the mining output according to the design, this study has calculated the current ventilation demand as a basis for analyzing, evaluating the efficiency of ventilation for the mine site at level -50÷-160 m and considering the future mining project below level -160 m. From there, with the available conditions such as works and equipment of the mine, the authors research and propose the most suitable solutions to complete the mine ventilation system of Cao Thang area mine. Therefore, this is a research work that not only has practical economic and technical significance but also has a long-term orientation for the development plan of Cao Thang coal mine, Hon Gai Coal Company - Vinacomin.
Methodology for preparing coal seams with high methane content by complex impact method
Authors: Vu Dung Tien Thai , Tran Thanh Van , Nguyen Mien Van , Do Tinh Van ,   Faculty of Mining, Hanoi University of Mining and Geology, Vietnam  Vietnam Mining Science and Technology Asscociation, Vietnam  Dong Bac Corporation – Ministry of National Defence, Vietnam  Vietnam National Coal – Mineral Industries Holding Corporation Limited, Vietnam
Published: January 2022

Safety is always a top priority in underground coal mining, especially when mining at great depths, which is accompanied by an increase in methane content of the coal seams. The high concentration of methane in mine airstream is cause of many negative effects on various underground works. In some cases, when the methane content in underground areas reaches the limit value, mine fires can occur with great loss of people and equipment. In many countries, where the coal mining industry is developed, practical experience in deep mining has shown that current popular methods of coal seams preparation can not always bring absolute safety in working faces, especially when extracting and recovering coal seams with high methane content. The purpose of this study is to develop an appropriate coal seam preparation method that can minimize the risk of methane emissions, which is one of the causes of unsafety in the underground coal mining. In this paper, the authors propose to use a combination of different impact methods through boreholes to control the intensity of methane release from high methane content coal seams. The combined use of hydraulic and vibration methods will greatly increase the network of man-made cracks in the coal mass, which allows methane to escape more easily and reduce the gas content of coal block before extracting. The research and testing of the complex impact method in real conditions has yielded positive results: the ability to release gas increased by at least 3÷5 times and the degassing efficiency reached over 60% for coal seams, which has low permeability. After research and analysis, the authors conclude that the complex effect method is a promising new direction to support the control of methane emissions and contribute to the improvement of technical – safety effects when extracting coal seams with high methane content.
Analyze the causes and propose solutions to prevent an increased temperature of the longwall in Khe Cham III coal mine
Authors: Dao Chi Van , Tran Ha Xuan , Nguyen Quang Van ,   Mining Faculty, Hanoi University of Mining and Geology, Vietnam  Vietnam Mining Science and Technology Association, Vietnam
Published: January 2022

During the coal mining period in the fourth quarter of 2020, the air temperature increased in mining areas and the survey results on the current state of the longwall 14.5.20 at Khe Cham III coal mine, showed that the air temperature rises to 320C and exceeded the permit regulation (300C) of QCVN 01/2011/BCT. To a nalyze the relationship between oxygen adsorption capacity and temperature in coal samples, coal samples were taken at the head and bottom of the coalface. The result shows that the oxygen adsorption constant U25 = 0.0032 is the largest in the coal samples, while the Russian standard for self-ignition of coal is U25 ≥ 0.016. Therefore, the coal samples of Khe Cham III coal mine are low self-ignition. Thus, it can be seen that the causes leading to the increase in temperature in the longwall 14.5.20 due to the compression of the road ventilation, the only measured airflow is 7.68 m3/s, while the required airflow is 16 m3/s. On the other hand, due to the influence of thermal radiation from the surrounding rock, the area has finished mining on the longwall and the road is narrow lead to the airflow is not small enough to carry this heat out. To ensure safety in the mining process when there are signs of increasing temperature from the mining areas. The article proposed solutions to complete the ventilation system; drilling and pumping water into the coal face; construct walls to isolate the exploited area to prevent oxidation of coal and temperature in the goaf spread to longwall.
Research on the stability of reused roadways at Khe Cham I coal mine
Authors: Le Phuc Quang , Than Duy Van ,   Faculty of Geoscience and Geoengineering, Hanoi University of Mining and Geology, Vietnam  Institute of Mining Science and Technology - Vinacomin, Vietnam
Published: January 2022

The deformation and supporting methods, maintaining roadways stability are always important issues in coal mining and safe production, especially for roadways in complex geological conditions. To identify the cause and direction to overcome the disadvantages of supporting and maintaining the stability of reused roads, a case study at seam 11, Khe Cham coal mine I, is presented in this paper. Here, coal seams are exploited with a longwall system, and the roadway is reused with the function of transport and ventilation when mining adjacent panels. In the reuse phase, between the roadway and the goaf is a 20m wide coal pillar, and the main roof of the seam is a hard roof stratum. Based on the results of the detailed field survey, the deformation characteristics of the road and the damaged types of the supporting structure were investigated. The study results show that there is serious deformation and because SVP steel resistance cannot control the movement of the surrounding rock mass and ensure roadway stability. The deformation and narrowing of the roadway section have negatively affected the transportation and ventilation and labor safety. In addition, roadway repair and reinforcement must be carried out regularly, leading to an increase in workload and production costs by 1.5-2 times. To limit the deformation of re-used roadways, the development directions of the supporting structure have been recommended. The research results of the paper can provide reference for the stress-strain study direction of the roadways under similar geological conditions.
Orientation underground exploitation method to develop for the Lang Vai of small scale antimol region, ​Tuyen Quang Province
Authors: Nguyen Hung Phi , Bui Tung Manh , Nguyen Hoa Nhu Thi ,   Faculty of Geoscience and Geoengineering, Hanoi University of Mining and Geology, Vietnam  Faculty of Fundamental Science, Quang Ninh University of Industry, Vietnam
Published: January 2022

Vietnam's mineral resources are very rich yet dispersed; the majority of ore mining are on a modest scale. One such mine is the Lang Vai antimony mine in Tuyen Quang province. The mine contains around 55,000 tons of main ore reserves with a concentration of 0.07 4.56 percent. The ore body is spread in the form of beds, veins, and steep slopes. With these sorts of mines, the issue for mining engineers is balancing technological indications, mining safety, and cheap production costs. If mechanized mining technology is used, capital recovery is not possible; if manual technology is used, productivity and safety are low, and the payback period is long. The building solution is simple, based on an examination of the features of such a mine, which is naturally placed of the ore body, the mechanical and physical qualities of the surrounding rock, and so on, with the objective of the shortest ore production time. simple. The article offers a strategy to approach the ore body through a vertical well combined with a through-seam furnace, an ore storage mining system, the building of a pipeline to prepare for production in the ore body, and a road drill construction technique. Breaking rock with 36 mm glass using a blasting technique. Simultaneously, compute some fundamental efficiency requirements based on the chosen plan.
Building 3D model for the deep vertical shaft in Nui Beo coal mine using Terrestrial laser scanning technology
Authors: Tran Hanh Hong , Pham Nhan Thi ,   Faculty of Geomatics and Land Administration, Hanoi University of Mining and Geology, Vietnam  Faculty of Civil Engineering, Hanoi University of Mining and Geology, Vietnam
Published: January 2022

Nowadays, deep vertical shafts have been built normally in Vietnam’s underground coal mines. During the operation of the underground coal mines, the deep vertical shafts must check periodically. With the advantages of fast measurement, high accuracy, point cloud data, the ability to process data by other specialized software, etc. Terrestrial laser scanning technology has allowed building 3D models for deep vertical shafts and used for other different purposes. In this present, by using Topcon's equipment and software, the process of establishing a 3D model for the main vertical shaft of the Nui Beo coal mine at a depth of 400 m was indicated. The simulation results have the cumulative error of sampling interval of stations not more than 4 mm, and the average position deviation of the aim direction relative to the vertical is 8.3 mm.
Mapping of clay soils exposed to the shrinking - swelling phenomenon, with EO - 1 - Hyperion data in the region of Sidi - Chahmi, Algeria
Authors: Rahal Farid , Hamed Fatima - Zohra Baba - , Hadjel Mohamed ,   Laboratory of Sciences, Technology and Process Engineering, University of Sciences and Technology of Oran, Mohamed Boudiaf, BP 0 El M’Naouer, 000, Oran, Algeria  Civil engineering Department, University of Sciences and Technology of Oran, Mohamed Boudiaf, BP 0 El M’Naouer, 000, Oran, Algeria  Laboratory of Sciences, Technology and Process Engineering, University of Sciences and Technology of Oran, Mohamed Boudiaf, BP 0 El M’Naouer, 000, Oran, Algeria
Published: January 2022

Satellite images have a remarkable ability to help researchers map the distribution and detect the nature of the soil exposed on the earth's surface. The remote-sensing mapping of clayey soils makes it possible to determine their shrinking-swelling potentials. This approach is helpful in analyzing large areas where the traditional sampling approach with laboratory analysis is expensive. This high cost often leads to a limited number of samples and thus to a poor representation of a site with an underestimation of the presence of swelling soils. The Sidi - Chahmi area is representative of this type of soil. In addition, it is an area that undergoes the substantial urban sprawl of the city of Oran. The urbanization of this area is under the risk of clay-type soil movements, the identification of which by satellite imagery may help mitigate shrink-swell risk. EO-1-Hyperion hyperspectral images, whose effectiveness has already been proven for mapping clay minerals, were used to identify minerals such as illite, montmorillonite, and kaolinite in the Sidi - Chahmi area.
Displacement monitoring of high-rise buildings by using terrestrial laser scanners: Faro Focus3D X130
Authors: Pham Trung Dung , Cao Xuan Cuong , Le Duc Tinh , Ngo Cuong Sy , Le Dinh Van ,   Faculty of Geomatics and Land Administration, Hanoi University of Mining and Geology, Vietnam  Vietnam Natural Resources and Environment Company, Vietnam  Survey and Aerial Mapping One member Limited Liability Company, Vietnam
Published: January 2022

Monitoring the displacement of high-rise buildings using a terrestrial laser scanner (TLS) is an active research topic in the field of engineering surveying. The Faro Focus3D X130 is one of the most suitable scanners which is widely used in different industries, such as architecture, archaeology, shipbuilding, and construction. However, in engineering surveying, the potential use of this scanner is not investigated for displacement monitoring yet. This paper's goal is to evaluate the accuracy of this scanner in the displacement monitoring of high-rise buildings. In the fieldwork experiment, the high-rise-rise building’s displacement is simulated by a movement of the board installed on this building. In addition, the surface material, scanning geometry, and point density of data that influenced the scan quality are investigated. The cloud - to - cloud method in CloudCompare software is applied to measure the distance between point clouds in two epochs. The distance between two point clouds allows determining the displacement of the board in two epochs. The results show the deviation between displacement analyzed from point clouds and the actual displacement is smaller than 2 mm in all experiments. TLS completely fulfills the required accuracy in the displacement monitoring according to the Vietnam construction standard. This study indicates that Faro Focus3D X130 is suitable to use in the displacement monitoring of high-rise buildings in practical engineering surveying.
Studying the biochar modified by AgNO3 from coffee grounds to handle organic pollutants and microorganism in the seafood-processing wastewater
Authors: Tran Huong Thu Thi , Nguyen Tong Xuan , Vu Toan Ngoc , Pham Nga Thanh , Nguyen Cuong Manh , Doan Van Thanh , Tran Cuong Manh , Tran Hieu Duc , Nguyen Huan Quoc ,   Faculty of Environment, Hanoi University of Mining and Geology, Vietnam  Institute of Environmental Science, Engineering and Management, Industrial University of Ho Chi Minh City, Vietnam  Institute of Chemistry - Material, Institute of Military Science and Technology, Vietnam  Faculty of Chemistry, Hanoi National University of Education, Vietnam  Faculty of Environmental Sciences, VNU University of Science, Vietnam
Published: January 2022

The aim of this study is to use four types of biochar modified AgNO3 from coffee grounds including CF5 (600°C/1.5h), CF6 (600°C/3h), CF7 (700°C/1.5h), and CF8 (700°C/3h) for the treatment of organic contaminants and microorganism in the seafood-processing wastewater. The results showed that the materials had the porous structure and the diameter of the pores corresponded to the crystal plane. The carbon content in the four samples reached over 90%. In addition, four samples observed the presence of Ag with the weight percentage varying from 0.06 to 0.09%. The adsorption capacities for pollutants by the four materials at different times were different. After the adsorption time, the COD value was still from 1.6 to 5.2 times higher than the limited value of the Vietnamese Standard QCVN 11:2015/MONRE - National technical regulation on the effluent of aquatic products processing industry. The three remaining parameters: TSS, ammonium (NH4+), and microorganism met the standard limit value requirement of QCVN 11:2015. The TSS contents decreased with the lowest adsorption efficiency in CF5 sample (68.87%) and the highest value in CF8 sample (99.21%); NH4+ content decreased respectively from 385.14 mg/L to 19.97; 15.55; 21.5 and 19.16 mg/L (CF5-CF8) with the efficiency over 94% after 2h adsorption. The removal capacity of coliform in CF7 sample is the highest value of 640 MPN/100 mL with the efficiency of 98.61% while the lowest one obtained in CF5 sample with 4.300 MPN/100 mL and the efficiency of 90.65%.
Numerical modeling of slope stability incorporating complex reinforcement solution in high-risk failure area- unusual case study
Authors: Pham Ngoc Anh , Osinski Piotr , Do Ngoc Anh , Koda Eugeniusz , Nguyen Manh Van , Bui Duc Van , Tao Ngan Van ,   Faculty of Civil Engineering, Hanoi University of Mining and Geology, Vietnam  Institute of Civil Engineering, Warsaw University Of Life Sciences, Poland  Fucons Foundation and Underground, Vietnam
Published: January 2022

The rapid economic development of Vietnam triggers a number of challenges in all sectors including infrastructure design and execution. New development plans and lack of space in densely populated and economically valuable areas creates a need for complex engineering solutions to meet the demand. The present research is a case study investigating reengineered vast natural slope to meet all requirements for geotechnical safety such as maximum displacements and factor of safety. Complex ground conditions and significant dimensions of the slope made the entire structure very likely to cause major risk for the future development plan of the site. Due to complex conditions, the slope was divided into 4 main sections. Each section was reinforced using a combination of soil nails, ground anchors, drainage systems and micro piles, of 19m for a single pile. Due to very much limited space available new geometry of the slope was designed for inclination reaching 1:0.3. Based on numerical modelling and computation the results revealed that the maximum lateral displacements felt in a range of 37-50x10-3 m and the factor of safety was 1.56-1.65, depending on a section and analysed scenario. The computations allowed proposing combined geotechnical solutions for very much challenging sites, assuring high safety standards and fitting the entire design within a limited available area.
Estimate the Meaning-Time-To-Failure of LED driver using Numerical simulation
Authors: Nguyen Si Tien , Pham An Dinh ,   Faculty of Civil Engineering, Hanoi University of Mining and Geology, Vietnam  Technical Support Manager, Advanced Technology Joint Stock Company, Vietnam
Published: January 2022

The Meaning-Time-To-Failure (MTTP), also known as Electromigration Analysis is an estimation of product life. Light-Emitting Diodes (LEDs) are usually driven by constant current switched-mode power supplies, which are invented early than LEDs for lighting applications. While LEDs themselves are extremely reliable and have a long lifetime, the electronic LED drivers in experiment usually fail due to overheating causing Printed Circuit Boards (PCBs) explosion, inability provide current/voltage input to the LEDs over their whole lifetime. This paper proposes a numerical simulation method to predict fault location on PCB of LED driver based on 2-way coupling electro-thermal multiphysic analysis, then applies the analytic models to calculate the time to failure of the points on PCB of LED drivers. The procedures can be applied to assist managers in assessing risk and making LED-based lighting system reliability decisions.
An Exploratory Study of Predictors of Pre-Service Teachers’ Intention to Integrate Computer Games in Mathematics Education
Authors: Liu Xiongyi , Wachira Patrick , Koc Selma , Pourdavood Roland
Published: January 2022

The purpose of this exploratory study was to examine whether specific attitudes and beliefs among pre-service teachers about the use of computer games in mathematics teaching and learning predict their intention to integrate computer games in future mathematics teaching. Data were collected via a questionnaire from 119 teacher education students in a mathematics methods class at a midwestern USA university. Findings indicate that previous experience of computer gaming, gamer identity, self-efficacy for computer game-based teaching, perceived educational benefits of computer games, and gender stereotypes about computer gaming were significantly related to intention to integrate computer games in future teaching. Multi-level linear regression analysis indicates that self-efficacy, perceived benefits and gender stereotypes did not explain significantly more variance in intention for game integration above and beyond that explained by previous experience of computer gaming and gamer identity. Gender and specialization of the preservice teachers were related to previous experience of computer gaming and gamer identity. The results and educational implications of the study for teacher education and policy making are discussed and limitations of the study are addressed.
The Teacher’s Educational Psychological Game Sense (EPGS) as the Foundation of a Student’s Positive Self-Conception
Authors: Hyvärinen Sanna , Sahito Zafarullah , Uusiautti Satu , Määttä Kaarina
Published: January 2022

This research analyzed how university students of education perceive the formation of self-conception in classroom situations. The following questions were asked: (1) Which factors have positive and negative impact on students’ self-conception? and (2) How does the teacher’s action appear in this regard? This study applied the narrative research approach. Altogether 70 students participated in the study. The data collection method used empathy-based frame stories. The data was analyzed first with the method of the analysis of narratives. In the second round of analysis, the variation between the students’ narratives were compared following the idea of the method of empathy-based stories in research. Group-related factors influencing on students’ self-conception, student-related factors influencing on self-conception and the teacher-related factors influencing the student’s self-conception are introduced as findings. According to the findings it seemed that the teacher’s educational psychological game sense (EPGS) could be named as the defining factor that lies in the intersection of the student-related factors, the group-related factors, and the teacher-related factors.
Effects of Online Constructivist 5E Instructional Model on Secondary School Music Lessons
Authors: Kibici Volkan Burak
Published: January 2022

In this research, it was aimed to investigate the effect of online 5E instructional model on the 6th grade music lesson of secondary school in terms of students' course achievement, attitude and retention. The research had a pretest-posttest control group, which is one of the semi-experimental models. The research was carried out on 40 students studying in a private secondary school in Turkey in accordance with the purpose of the study. A teaching program based on the online 5E instructional model was developed for the experimental group. For this purpose, an 8-week instruction program was designed. Applications were carried out simultaneously in the experimental and control groups. In the research, secondary school 6th grade music lesson achievement test and attitude scale were used as data collection tools. Mann Whitney U test was applied to compare the scores of the achievement test, attitude scale and retention test of the groups. Significant differences were found between the music lesson posttest and attitude scores of the experimental group that was taught online according to the constructivist 5E model and the control group, which was taught using the traditional teaching method.
The Role of Academic Self-Efficacy and Social Support in Achieving Academic Flow in Online Learning
Authors: Suryaratri Ratna Dyah , Komalasari Gantina , Medellu Gita Irianda
Published: January 2022

Academic flow is an important factor characterized by feelings of happiness, increase in concentration and self-control, focus and activities, thereby making students’ learning effective. However, exploration of academic flow is still limited, specifically during the global pandemic, which forced students to study from home, including in Indonesia. Therefore, this study investigates the effect of students' academic self-efficacy and social support towards academic flow during the pandemic. Data were collected from 400 college students consisting of 135 males and 265 females. The measurements used in this study are Flow Inventory for Student, College Academic Self-Efficacy Scale (CASES), and Social Provisions Scale (SPS). Multiple linear regression analysis was conducted to test the hypotheses. The result showed that academic self-efficacy and social support positively and significantly influenced college students' academic flow during online learning. This means an increase in academic self-efficacy and social support will likely lead to a rise in academic flow, specifically during the pandemic.
Yugoslav Unification in the Work of Hamdija Kapidžić
Authors: Radušić Minela
Published: January 2022

This paper uses Hamdija Kapidžić’s study Bosna i Hercegovina u vrijeme

austrougarske vladavine (članci i rasprave) [hereinafter: Bosnia and Herzegovina in the

Austro-Hungarian period (Articles and Discussions)] in order to question the way in which

the socialist historiography of Bosnia and Herzegovina observed the Yugoslav unification

in 1918, and the extent to which historical revisionism was present in that approach. The

analysis focuses on the scientific profile of researchers, relevance of sources, the connection

between the source and the conclusion for the purpose of determining the extent to which

Kapidžić’s theses are scientifically founded and the extent to which they were a product of

historical revisionism.
The 1444 Treaty between King Alfonso V of Aragon and Grand Duke Stjepan Vukčić
Authors: Peco Almir
Published: January 2022

This article discusses a famous agreement between King Alfonso V of Aragon

and Naples and the Grand Duke of Bosnia, Stjepan Vukčić Kosača signed on 19 February

1444, as a result of both political and millitary circumstances that had brought, in that

particular moment, the local interests of one Bosnian lord and the foreign policy plans and

ambitions of the most powerful Mediterranean ruler to the same level. It also offers a new

interpretation of this treaty in terms of its practical application, as well as its re-reading and

translation, based on a high-resolution facsimile.
Yield Trials of Leucaena in the U. S. Virgin Islands
Authors: Oakes A. J. , Skov O.
Published: January 2022

The yield of 10 strains of Leucaena from widely separated regions in the Tropics was determined in replicated field trials. Yields varied from 3 to 8 tons of dry forage per acre per year between strains; these differences in yield are significant. The superiority of strains of L. leucocephala from Guatemala, El Salvador, Australia, and Peru is shown. Annual yields of protein varied from 832 to 2,550 pounds per acre. The protein content of dry forage ranged from 14 percent for L. esculenta from Mexico to 16.2 for a strain of L. leucocephala from the U.S. Virgin Islands. Any of these strains, producing 5 to 10 tons of dry forage and a ton of protein per acre annually, would serve as an excellent protein source for livestock enterprises in the dry Tropics.
The effect of hyperbaric oxygenation on the state of blood cells in children with inflammatory bowel diseases
Authors: Popovicheva Alexandra Nikolaevna , Martusevich Andrey K. , Neshchetkina Irina A. , Fedulova Elvira N. , Zagrekov Valeriy I.
Published: January 2022

The aim of this work is to determine changes in erythrocyte and platelet indices during standard therapy for inflammatory bowel diseases (IBD) in children and combination with hyperbaric oxygenation (HBO). Materials and methods. We used the blood of 147 children of both genders aged 6-17 years with IBD: 76 - with Crohn’s disease (CD), 71 - with ulcerative colitis (UC). The complex of treatment for patients (16 with CD, 11 with UC) included HBO therapy, which was carried out in a single air-oxygen pressure chamber «BaroOx 1.0». The course consisted of 5-8 daily sessions in the 1.3-1.4 atm regime for 40 minutes. The number of platelets and blood cell indices in all patients were determined: MCV, RDW, MCH, MCHC, MPV, PDW. Results. IBD in children is characterized by a significant increase in platelet count, a decrease in MCV and MPV, and an increase in RDW and PDW. The use of HBO in IBD treatment promotes an increase in MCV, MCHS and a tendency to decrease the number of platelets. Conclusion. The patterns of changes in the qualitative and quantitative characteristics of blood cells that we have established indicate that the use of HBO to the standard treatment protocol for IBD in children contributes to the correction of the identified disorders.
Bronchial asthma in children of Mongolia: prevalence and risk factors
Authors: Tsevegmid Urtnasan , Solongo Orosoo , Narmandakh Javzandorj , Undrah Ankhbayar , Oyunchimeg Anchin , Gerelmaa Nansal , Nasantogtoh Erdenebileg
Published: January 2022

Introduction. The peculiarity of this work is to determine the prevalence of bronchial asthma (BA) in children and the risk factors for its development in Mongolia. This country is intensively developing economically and is at the stage of transition to an industrial society, which allows assessing the impact of environmental and population changes on the frequency of BA formation. The aim of the work is to determine the prevalence and risk factors for the development of BA in children of Mongolia. Materials and methods. The prevalence of BA and data on patients aged from birth to 19 years living in Ulaanbaatar, 17 aimags and six districts of Mongolia were studied using a modified written questionnaire. To determine the prevalence of BA, we surveyed parents and 1,779 BA children patients. Information on biomedical and socio-hygienic risk factors for the development of BA in children of Mongolia was obtained after analyzing the data of a special questionnaire from 1,507 schoolchildren. All the received data are processed statistically. Results. The prevalence of BA in children of Mongolia was found to account for 11 per 1,000 children. The highest incidence of BA in children was found mainly in the northern regions of Mongolia, with a sharply continental climate and high air pollution. Among the risk factors for the formation of BA in children, the most significant are burdened heredity, smoking, unfavourable living conditions, pregnancy pathology, Breastfeeding disorders in the newborn period, irrational nutrition of the child, acute respiratory infections. In 50% of BA patients, a significant increase in eosinophils was revealed. 61.2% of patients had an increased level of IgE. Regardless of the region of residence of BA children, polyvalent pollen sensitization was the most frequent - 59.3%, food allergy - 55.5%, epidermal allergy - 38.3% of cases, household (8.3%) and fungal sensitization (5%) were rarely detected. Treatment of 89 BA children in the National Center for Maternal and Child Health hospital under the Global Initiative for Asthma strategy helped improve patients’ condition.
Quality of life for children with autism spectrum disorders
Authors: Vinyarskaya Irina V. , Lashkova Anna V. , Chernikov Vladislav V. , Terletskaya Rimma N. , Kuzenkova Lyudmila M. , Antonova Elena V.
Published: January 2022

Quality of life is an essential component of information about children with neurodevelopmental disorders, including autism spectrum disorders. The purpose of the present study was to assess the quality of life of children with this pathology. Materials and methods. Fifty-two 5-6 year patients with autism spectrum disorders were examined at the clinical and diagnostic centre of the Federal State Autonomous Institution «National Medical Research Center for Children’s Health» of the Ministry of Health of the Russian Federation. The comparison group was fifty-one healthy children matched for age and gender. Quality of life was assessed by interviewing patient parents using the Russian-language version for 5-12 years children of the Health Utilities Index (HUI). Statistical analysis was performed using the «SPSS v.26.0» («StatSoft Inc.»). Results. The quality of life of children with autism spectrum disorders turned out to be significantly lower than the scores of healthy children due to the aspects of «Speech», «Cognition», «Emotion». At the same time, parents of patients were less likely to note the presence of pain. Levels of disability categories are determined for each attribute of quality of life. Conclusion. Presented features of violations of quality of life in children with autism spectrum disorders allow suggesting a complete picture of the disorders to improve the medical care of these patients.
Sociopragmatic Differences and Behaviors in the Use of WhatsApp in Virtual Classrooms at a Public College of Education in Ghana
Authors: Dadzie Solomon , Horsu Salomey , Kyei Emmanuel
Published: January 2022

This study sought to establish how tutors at Komenda College of Education engaged students in virtual classroom during the COVID-19 pandemic. The study employed a qualitative approach through the descriptive design. Data was 462 conversations between tutors and students through the WhatsApp messaging application. To ensure anonymity and confidentiality, all personal names and other details were removed. The study established that while tutors posted more messages than students, messages of the tutors were made up of instructions, commands and directions. Students addressed their tutors with high respect. Female students sent more and longer messages and utilized more emoticons than their male counterparts. Contracted and non-conventional forms of speech were very common in students’ WhatsApp chats with their tutors. Both the tutors and students used persuasive words (e.g. please, and kindly) as a way of gaining approval from the other party. Verbal fillers in the WhatsApp group chats performed two macro-functions: interpersonal and textual. Based on the findings, the following recommendations were made. First, institutions of higher learning should provide the instructional support to teachers and students on how to minimize or maximize their own speech differences while engaged in a virtual classroom. There should be pedagogical models in virtual classrooms that allow learners and facilitators to engage in more informal ways. Finally, for an effective online learning to take place, tutors and students should appropriately accommodate each other.