bluuebunny/crossref_metadata_2025_split huggingface dataset:
Increasing the profitability of production of hard-to-recover oil reserves based on the choice of a rational development system
Authors: Agishev E R 
Published: August 2023

Abstract
The article presents a solution to the problem of determining the most effective system for the development of hard-to-recover oil reserves confined to thin-layered clay-bearing reservoirs, based on geological and hydrodynamic modeling. The ratio of oil recovery factor and net discounted income was used as an assessment of the project efficiency. When selecting, the profile was varied - a directional well with hydraulic fracturing and a horizontal well with multi-stage hydraulic fracturing, the method of organizing the system for maintaining reservoir pressure, the density of the well grid and the technological parameters of well completion - the length of the horizontal section and the distance between the hydraulic fracturing sleeves. To confirm the results obtained, an analysis of the operation of the wells launched at the facility was carried out, which showed the convergence of the rate of decline in production rates in the absence of the involvement of the underlying horizon by a hydraulic fracture. Additionally, when choosing a site for pilot work, an option was considered to use the existing well stock to organize a reservoir pressure maintenance system while maintaining the geometry of the development element. According to the calculations, the application of the developed solutions will make it possible to double the oil recovery factor and the net discounted income of the project compared to the base case.
To calculate the maximum annual level according to the water rating curve (on example the small River Zlaya)
Authors: Akhmedova N R , Kh Aliyeva A , Naumov V A 
Published: August 2023

Abstract
The rating curve of water in the river is an important characteristic of the water regime. In this article, the series of maximum annual levels and discharges of the Zlaya River (hydrological post Priozerye, Kaliningrad region) are indicated; rating curves of Zlaya River for different years were constructed. It has been established that the number of maximum annual discharges of the Zlaya River after 1991 tends to decrease, while the linear trend of the maximum annual levels shows an increase. The largest positive drawdown of the rating curve of Zlaya River was recorded from the early 60s to the mid-70s of the 20th century, which, presumably, was affected by the commissioning of a large array of drained lands during this period. The results of the study can be used in conducting hydrological surveys, developing measures for water resources management.
The study of economically valuable traits of sweet pepper collection varieties and effectiveness economic evaluation of their cultivation in the conditions of protected ground in Armenia
Authors: Zh Sargsyan G , Vardanyan N S , Vardanian I V 
Published: August 2023

Abstract
In the conditions of an unheated film greenhouse 14 collection sweet pepper (Capsicum annuum L.) samples were studied: Darovita F1, N-62-439 (Nickerson-Zwaan), Yupiter F1, Dimentio F1, Blondi F1 (Syngenta), AVPP 0503, AVPP 0709, AVRDC-9946-2192, PBC-371, AVPP 0408, AVRDC-0701, AVPP 0910, AVPP 1115, AVPP 05483 - from genbank of AVRDC (Asian Vegetable Research and Development Center). According to the duration of the phenophases, 11 samples were assigned to the group of mid-ripening and 3 samples were classified as late-maturing. The varieties differed in shape, color, average weight of the fruit (within 76.1 to 208.4g). The total yield of variety samples varied from 8.9 to 15.9 kg/sq m, with the control variety “Sate”- 11.5 kg/sq m. Varieties AVPP 05483, N-62-439, AVPP 0503, AVRDC 0701 turned out to be the most highly productive, in which the increase to the standard was 20.9, 22.6, 33.0, 38.3% and profitability of cultivation was 125.6, 120.3, 129.1, 130.7% respectively. Variety samples from AVRDC AVPP 0503 with the name “Narinj” and AVRDC-0701 - “Loshtak” passed the State Variety Testing and are now successfully cultivated in greenhouses of Armenia.
Comparison of the minimum discharge of the Instruch river at the beginning of the 20th and 21st century
Authors: Akhmedova N R , Naumov V A 
Published: August 2023

Abstract
The hydrological series of the minimum annual discharges of the Instruch River (hydrological gauging station Ulyanovo, Kaliningrad region) was studied. The values of the minimum discharge rates were processed in the Mathcad environment. The characteristics of the minimum discharges (average and minimum annual, minimum 5-, 10- and 30-day discharges) of the Instruch River in 1901-1912 and 2008-2020 are determined. A comparative analysis of the characteristics of the minimum annual discharges of the river Instruch for the indicated periods.
Mineral elements and heavy metals in plant composition Pectorales species No. 2
Authors: Chevidaev V V , Bokov D O , Samylina I A , Strelyaeva A V , Rendyuk T D 
Published: August 2023

Abstract
The authors analyzed the elemental and mineral content of the plant composition Pectorales species No. 2 (PS No.2) which includes herbal raw materials coltsfoot leaves, plantain leaves, licorice roots by ICP-MS. 25 elements have been identified in PS No.2. The highest content was reached by potassium (2243.13 mg/kg), calcium (881.14 mg/kg) and magnesium (156,08 mg/kg). The content of lead (0.007 mg/kg), cadmium (0.0035 mg/kg), mercury (0.0011 mg/kg) and arsenic (0.0056 mg/kg) does not exceed the MPC specified in the in the State Pharmacopoeia of the Russian Federation, XIV edition.
Selection of the most prospective strains for inclusion in the composition of a biopreparation on the basis of cellulose-destroying microorganisms
Authors: Maiorov P S , Lyashenko E A , Feoktistova N A , Suldina E V , Atamanova E E 
Published: August 2023

Abstract
A great number of plant residues remain in the soil after harvesting almost all types of agricultural crops. At the same time, such residues mostly consist of cellulose, which can enrich the soil with feed sources for further agricultural crops. However, plants are not able to use cellulose itself, and thus great importance is given to various microorganisms involved in the cleavage of cellulose to more simple compounds. Within the framework of this work, the cellulolytic ability of 221 strains of bacteria isolated earlier from soil and peat samples was studied. The obtained data made it possible to select 35 strains with the highest cellulose activity. Most of the studied bacterial cultures had no antagonistic properties towards each other, which allows to use them together in the developed biopreparations. In conclusion, we offer a scheme for the production of experimental biopreparations to evaluate the collaborative work of selected bacterial strains directly in the field.
Populations structure and role of Hedysarum grandiflorum in the spatial organization of plant communities of petrophyte steppes
Authors: Ilyina V N , Zenkina T E , Mitroshenkova A E , Kozlovskaya O V , Senator S A 
Published: August 2023

Abstract
Comprehensive monitoring and assessment of the state of vegetation cover of Samara Trans-Volga show that steppe landscapes are the most vulnerable, and areas of petrophytic steppes. Rare species include Hedysarum grandiflorum Pall. This species is protected in the territory of Russia. Structural features of cenopopopulations were studied in more than 50 natural-territorial complexes. The number of individuals in populations of specific locations is usually sufficient to make a comprehensive assessment of the species at different levels of organization (organismal, population, species, and phytocoenotic). The study of cenopopopulations was carried out in 1998-2020. During the field studies, we used the method of laying test sites (stationary plots). Data on the spatial distribution of individuals were processed in the R environment (version 3.3.2) using the SPATSTAT package. The intensity of the location of individuals of the studied species was estimated using the Gaussian kernel function with boundary correction. Most of the H. grandiflorum populations known to us are (or have already been) degraded or even critical due to irrational economic exploitation of natural complexes. The random type of placement of individuals indicates favorable habitat conditions for the studied species at stationary plots. Perhaps, some tendency of pregenerative individuals to cluster is due to the mosaic location of sites suitable for seed germination (small depressions with sufficient moisture, areas not occupied by vegetation, formed under the action of exogenous factors).
Study of the method of using an electric starter to stabilize the rotational speed of a gas turbine plant
Authors: Krylova I A , Kavalerov B V 
Published: August 2023

Abstract
The article discusses the use of a synchronous motor as an electric starter of a gas turbine plant. A gas turbine plant is used to drive an electric generator in a power plant. It is shown that the same starter can be used in the electric motor mode to stabilize the rotational speed of the gas turbine plant. This is especially important and relevant for fast and large changes in the load of a gas turbine plant. Changing the electrical load of the power plant directly affects the load of the gas turbine plant. Since the gas turbine plant has a large time constant, it is necessary to quickly supply additional power to stabilize the rotational speed of its shaft. It is proposed to use an electric starter for this. The control of the starter by a perturbing signal is studied by means of simulation. Then the scheme of the control system is modified to determine the disturbing effect by calculation. Graphs of simulation results are presented and the results obtained are discussed.
Water removal from a gas well under different pressure conditions
Authors: Bacirheba Mugisho Joel 
Published: August 2023

Abstract
By looking at report analyzes as well as research, it emerges that in the decades to come, several gas field wells will see their productivity significantly reduced due to the influx of water into these operating wells. It is under these conditions that artificial lifting methods can be used to maintain the well in an economically profitable state of productivity. In the article the rate of evacuated water from a vertical tube under different pressure conditions are compared.
Analysis of dynamic response of three-span bridge using vehicle load data from Road Administration Department IV in Vietnam
Authors: Nguyen Xuan Toan , Dang Cong Thuat , Nguyen Thi Kim Loan , Nguyen Duy Thao , Tran Van Duc 
Published: August 2023

Abstract
In many studies, the dynamic response of bridges is influenced by various factors. Multiple factors, such as vehicle loads, road roughness, vehicle-bridge interactions, and travel speed, impact the dynamics of a three-span bridge on highways. Because the mass of the vehicle, including the cargo, fluctuates randomly, a probabilistic methodology based on the Monte Carlo method is utilized to produce random anomalies for dynamic analysis. To examine the Song Gieng bridge, data from the Road Administration Department IV on heavy vehicle loads and overloaded vehicles are utilized to produce random vehicle loads. The analytical results indicate that there is a discrepancy in the probability distribution rules between the vehicle load (input random variable) and the dynamic impact factor (output random variable). This implies that their mapping connection is not monotone. Compared with the threshold values specified in the bridge design standards of Vietnam and the United States, the dynamic impact factor obtained in this study is significantly different. These findings can provide additional guidance for practicing engineers.
Thermally induced vibration analysis of sandwich beam with metal foam core subjected to blast loading by a framework of two-unknown higher-order beam theory
Authors: Hung Tran Quang , Duc Do Minh , Tu Tran Minh 
Published: August 2023

Abstract
Vibrational characteristics of a sandwich beam in thermal environments subjected to blast pressure are investigated in this paper. The sandwich beam is composed of two isotropic skins and an open-cell metal foam core with either uniform or symmetric distribution of internal pores. The pressure of blast loading is modelled by Friedlander’s equation. A two-unknown higher-order beam theory combined with Hamilton’s principle is used to establish the governing equations. Navier-type solution and Newmark-beta method are applied to deal with the governing equation and obtain the dynamic responses. The efficiency and accuracy of the present study are examined through numerical examples. Effects of temperature-dependent material properties, porosity coefficient, core-to-skin thickness ratio, length-to-height ratio, and structural damping on the natural frequencies and dynamic deflection of the sandwich beam are investigated in detail.
Effect of deterioration overtime on the power spectral density of the bridge vibration responses under real traffic
Authors: Vuong-Cong Luan , Pham-Bao Toan 
Published: August 2023

Abstract
Working in an environment with many influencing factors can lead to the deterioration of construction. For bridges, the harshness and unpredictability of the environment can come from temperature, air humidity, wind, soil, and vehicle loads. Over time, these factors cause the quality of the bridge to degrade. Because there are too many factors acting simultaneously with varying degrees of influence, this paper only focuses on the parameter that represents the degradation over time, regardless of which factor the degradation is due to. The proposed parameter has a one-way variation with time, and its change is a sensitive indicator to operation process of the bridge. This parameter is calculated using measurement data of the bridge’s vibration over time and in response to actual traffic loads. This demonstrates the viability of this idea in the experiment.
Maintenance modeling and cost assessment for repaired reinforced concrete structures exposed to chloride attack in coastal areas in Vietnam
Authors: Truong Q C , Nguyen Q T , Soueidy C P , Bastidas-Arteaga E 
Published: August 2023

Abstract
One of the primary causes that can reduce the lifespan of concrete structures is chloride-induced corrosion of reinforcing steel. Recent research has shown that material properties, exposure conditions and climatic conditions have a significant influence on the structural deterioration of reinforced concrete (RC) structures, especially in marine environments. The objective of this paper is to predict the durability of RC structures damaged by chloride-induced corrosion in near-shore environments in Vietnam, considering regular repair activities. A two-dimensional model of chloride penetration in square cross-section RC columns repaired by cover replacement techniques is studied. Two repair methods with different shapes (orthogonal and circular) are considered. The effects of the different repair methods on the life span of structures are investigated in case studies in Vietnam that consider the variations of annual temperature and humidity in three coastal areas such as Danang, Haiphong, and Ho Chi Minh City. Finally, maintenance and repair costs during the lifetime of structures are calculated for each case. The study suggests that for RC structures exposed to two-dimensional chloride ingress, the most critical areas for assessing chloride concentration, predicting corrosion initiation, and planning repair schedules are the corners of the columns. In addition, the chloride-induced corrosion process is strongly influenced by the local weather conditions, especially in areas with high humidity. The repair method with circular concrete replacement seems to be more efficient in terms of maintenance schedule and cost than the repair method with orthogonal concrete replacement.
Analysis of bridge displacement using GNSS time-series data
Authors: Vu Ngoc Quang , Le Thi Nhung , Luong Ngoc Dung 
Published: August 2023

Abstract
Analysis and identifying the displacement characteristics play a key role in timely monitoring and detecting the physical responses of the bridge to ensure the safety of the human and structure. Many previous kinds of research used GNSS data to identify displacement and oscillation modelling of the bridge with different algorithms. This study uses GNSS time-series data to determine linear displacement and model oscillation of the bridge using a procedure including filtering outliers, linear regression, and sin function to identify amplitude in three directions, the plane displacement velocity, spatial displacement velocity, and vibration model of the bridge. The data in the research in the GNSS time-series data from three P5 GNSS receivers of the CHC brand on the Dachongyong bridge in Nanning, China with 1646 observations, at one-hour sample intervals in 68 consecutive days. The plane and spatial velocity of the three points DCQ01, DCQ02, and DCQ03 is 0.0181 mm/h, 0.0185 mm/h; 0.0114 mm/h, 0.0173 mm/h; and 0.0071 mm/h, 0.0082 mm/h respectively. The study results are significant in analyzing and identifying the bridge’s displacement characteristics.
Gamification in infrastructure and its application in Vietnam
Authors: Pham Bach Van , Bui Quynh-Anh Thi 
Published: August 2023

Abstract
In the Fourth Industrial Revolution, innovative approaches that are emerging to solve traditional problems are regularly updated and improved. Prominent among them is the gamification application in the infrastructure construction industry. This is an intuitive simulation tool that brings a high level of experience and efficiency. The article presented an overview of the gamification application in infrastructure. It can be seen that with the development of modern game engine and new technologies such as Building Information Modelling (BIM), Virtual Reality (VR), Mixed Reality (MR), Augmented Reality (AR), digital twin, gamification is used in different phases of a project such as design, construction and operation. Furthermore, the article also provides an assessment of opportunities and challenges when applying gamification to the infrastructure construction in Vietnam. Furthermore, some preliminary suggestions to improve the application efficiency are also made.
Studying the factors influencing user satisfaction and reuse intention towards monorail service using a PLS-SEM approach: A case study in Kuala Lumpur, Malaysia
Authors: Ibrahim Ahmad Nazrul Hakimi , Borhan Muhamad Nazri 
Published: August 2023

Abstract
This work aims to examine the factors that influence users’ satisfaction and reuse intention in respect of the monorail system in Kuala Lumpur, Malaysia. The hypotheses were tested with 417 survey data collected among monorail users. The newly developed model of users’ satisfaction and reuse intention was evaluated through structural equation modelling, the basis of which was a parameter estimation of partial least squares (PLS-SEM). Findings reported that the proposed model led to 70.4% and 59.5% of the variances explained by user satisfaction and reuse intention towards the service provided. The findings demonstrated convincingly that overall satisfaction and reuse intention are affected by two key factors from the users’ perspectives: perceived quality and perceived value. The results are useful for service providers and related bodies in their effort to enhance user satisfaction as well as increase the monorail service ridership.
Male and female students: who are more likely to be involved in risky riding behaviours and which are influencing factors?
Authors: Nguyen Bien Van , Hoang Linh Nhat , Nguyen-Phuoc Duy Quy , Mai Nhat Xuan 
Published: August 2023

Abstract
Young motorcyclists have been considered a high-risk population contributing to a high number of traffic crashes. Since rider risky behaviours have a serious impact on traffic safety, identifying the rider’s mindset can help clarify the nature of accidents. The data of the study were collected from students in some universities located in Da Nang city, Vietnam using a self-report questionnaire. Based on the combined framework of the theory of planned behaviour (TPB) and deterrence theory (DT), psychological factors affecting risky riding behaviour are explored. The research results show that the factors in the TPB model have a positive and significant influence on the intention to involve in risky riding behaviours among university students. In contrast, certainty has a negative impact on the behavioural intention. Additionally, in this study, a multi-group analysis is performed to further explore the differences between male and female riders. The results of this study are useful for developing strategies which aim to reduce risky riding behaviours among young riders, particularly in the context of a motorcycle-dependent country.
Understanding the adoption of electric motorcycles among road users in Vietnam
Authors: Tran Dinh Minh , Hoang Nhat Linh , Nguyen Van Bien , Nguyen-Phuoc Duy Quy 
Published: August 2023

Abstract
Motorcycles with internal combustion engines using fossil fuels account for the majority of traffic flow in major Asian cities. The increase in the number of conventional motorcycles using a gas engine is one of the main causes leading to air and noise pollution in comparison with other lower-emitting transport modes (e.g., walking, cycling, and public transport). Thus, many Asian countries have promoted the adoption of electric motorcycles to significantly reduce air pollution and non-renewable energy consumption as a solution for motorcycles using internal combustion engines. However, the application of electric motorcycles still faces many limitations and challenges. This study explores factors influencing the adoption of electric motorcycles in Vietnam based on the extention of TAM model. Based on 751 valid responses in Ho Chi Minh and Da Nang cities, Vietnam, a structural equation model (SEM) with first-order and second-order latent variables is proposed to analyse the collected data. The results indicate that perceived of usefulness is the most significant positive effect on the adoption of electric motorcycles. In contrast, perceived risk is found to be a barrier of the adoption intention. In addition, the results of multigroup analysis show that age moderates the correlation between prceived easy to use and the adoption intention. Similarly, the correlation between perceived risk and the adoption of electric motorcycles is influenced by the difference in monthly income. Several policies and governance implications are also discussed in this study.