bluuebunny/crossref_metadata_2025 huggingface dataset:
Evaluation of the influence of reservoir fluid on the occurrence of sticking of drill strings and casing strings under the influence of differential pressure
Authors:   Azerbaijan State Oil and Industry University, Baku, Azerbaijan, Suleymanov E. M. , Novruzova S. H. ,   Azerbaijan State Oil and Industry University, Baku, Azerbaijan, Aliev I. N. ,   Azerbaijan State Oil and Industry University, Baku, Azerbaijan, Gadashova E. V. ,   Azerbaijan State Oil and Industry University, Baku, Azerbaijan
Published: January 2023

In the work, a dependence was obtained, analyzing which it is easy to see that the dimensionless parameter of sticking hazard depends very significantly on the permeability of the reservoir and increases in proportion to the increase in pressure drop, which is fully confirmed by the results of numerous experimental studies of sticking under the action of pressure drop. At the same time, one of the main, but previously not taken into account, factors that contribute to the occurrence of sticking in drilling wells is the viscosity of the formation fluid, as it decreases, the dimensionless sticking hazard parameter (i.e., the possible sticking force) in the interval of occurrence of a given permeable formation increases sharply. Indeed, the experience of drilling operations in various regions indicates that when drilling wells in gas fields, the frequency and severity of sticking is much higher than when drilling wells in oil fields, this requires special consideration in the process of drilling wells in gas fields. Keywords: sticking; drilling and casing strings; differential pressure; filter cake; viscosity; formation fluid.
Improving the lower cretaceous deposits development efficiency in Western Siberia employing enhanced oil recovery
Authors:   Ufa State Petroleum Technological University, Ufa, Russia, Mukhametshin V. V. , Kuleshova L. S. ,   Ufa State Petroleum Technological University, Ufa, Russia
Published: January 2023

For the eleven groups of oil deposits in terrigenous reservoirs of Western Siberia, confined to the Lower Cretaceous deposits, the most effective techniques for enhanced oil recovery were selected based on a criteria analysis, followed by the numerical modeling application in terms of the final oil recovery factor. The need for a differentiated approach when using enhanced oil recovery techniques is specified. An algorithm for replicating the results obtained in the fields that did not participate in the study based on the analogy method is presented. Keywords: enhanced oil recovery techniques; oil recovery factor; hard-to-recover reserves; analogy method; differentiation and grouping of oil deposits.
Conducting emergency operations in wells with narrowed zones in the production string
Authors:   Education, training and certification department, SOCAR, Baku, Azerbaijan, Ibragimov Y. A.
Published: January 2023

The article provides information that the production string along the entire length consists of casing pipes of the same type-size with different wall thicknesses, in some cases thicker in the upper part, relatively less thick in the lower part; on the reduction of the inner diameter with some methods of restoring the tightness of casing strings. Conducting emergency operations in such wells stopped during operation by milling the emergency ends or their annulus, as a necessary measure, with milling cutters of a smaller diameter causes even greater deformation of the emergency ends up to breaks. And also for catching the wider lower part of the production string eccentrically located or leaning against the wall of the pipe, due to the impossibility of using a centering device – funnels, down-laid fishing tools without a centering device, although they freely pass through the narrowed zone of the production string located above the emergency end, due to the impossibility of covering with a bell, as well as directing the pipe rod into the inner surface of the fishing pipe, fishing work is unsuccessful. In these cases, the use of an eccentric sub in the assembly of the bottom of the drill string, the use of a milling cutter of the smallest diameter ensures the milling of the emergency end located below the narrowed zone, with a milling cutter of the required diameter corresponding to the inner diameter of the production string, and also provides the possibility of catching an emergency pipe without a centering device. Information about the design features and their advantages in the relevant downhole conditions is given. Keywords: emergency end; milling cutters; fishing tools; BHA; eccentric sub.
Regularities of hydrocarbons accumulations in the Meso-Cenozoic complex of the Black Sea-Caspian region
Authors:   S. Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia, Kerimov V. Yu. ,   Institute of Oil and Gas, ANAS, Baku, Azerbaijan, Mustaev R. N. ,   S. Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia, Lavrenova E. A. ,   S. Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia, Romanov P. A. ,   S. Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia
Published: January 2023

The article considers the regularities in the distribution of hydrocarbon accumulations in the Meso-Cenozoic complex of the Black Sea-Caspian region associated with the evolution of generation-accumulation systems developed in the plate cover of the region. The plate cover, as well as elements of the Mesozoic generationaccumulation systems, began to form in the structure of the Alpine structural-geodynamic systems. An analysis of the areal distribution of structural-geodynamic systems shows that the maximum development of sedimentary basins correlates with the transgressive Cretaceous period, which is characterized by the expansion of the areas of pre-existing basins and the emergence of new depocenters. In this case, two groups of basins are distinguished. The first includes the Karkinitsky, Bolshekavkazsky, West Kuban, Central and Tersko-Caspian basins. The second group includes depocenters Indolsky, East Kuban, Berdyansk, North Azov, West Stavropol, Gudilovsky, Ustyurtsky. The most significant events that determined the features of the evolution of generation-accumulation systems correlate with the latest time. Keywords: Black Sea - Caspian region; development of sedimentary basins; structural and geodynamic system; tectonic conditions; signs of oil and gas content.
Zones of hydrocarbons generation in the Meso-Cenozoic complex of the Black Sea-Caspian region
Authors:   S. Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia, Mustaev R. N. , Kerimov V. Yu. ,   S. Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia, Lavrenov E. A. ,   S. Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia, Romanov P. A. ,   S. Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia
Published: January 2023

As a result of the studies carried out within the study area, four areas of stable subsidence (basin) were identified during the entire period of the formation of the plate cover: Karkinitsky, Indolo-Kubansky, East Kubansky and Terek-Caspian. Each of the basins is characterized by a unique evolution, which manifests itself in differences in the tectonic regime and sedimentation rates. This determined the features of the geological structure of the basins, the sources of generation within them and the critical moment characterizing the process of generation - migration - accumulation of hydrocarbons in the system. Overcoming the critical moment occurs in the centers of hydrocarbon generation, when more than 50% of hydrocarbons emigrated from the source rock and accumulated in traps. As a rule, the sources are confined to the most submerged parts of the sedimentary basin, in which the deposits are in more severe thermobaric conditions. Keywords: sedimentary basin; hydrocarbon system; generation source; plate cover; tectonic regime; sedimentation rate; basin analysis.
Influence of structural-geodynamic systems on formation and distribution of hydrocarbon potential of the Black Sea-Caspian region
Authors:   JSC «Soyuzmorgeo», Gelendzhik, Russia, Senin B. V. , Kerimov V. Yu. ,   Sergo Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia, Mustaev R. N. ,   Sergo Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia, Leonchik M.I. ,   JSC «Soyuzmorgeo», Gelendzhik, Russia
Published: January 2023

The article considers the results of the reconstruction and analysis of the geodynamic conditions for the formation of the main elements of their structure in the Black Sea-Caspian region, expressed in the features of the distribution of its structural-geodynamic systems of different ages. As structural-geodynamic systems, sets of elements of the block and zonal structure of the upper part of the earth's crust (basement and sedimentary cover) are considered, united by the same type (general) reaction from an external or internal source of tectonic energy in relation to the system during a certain phase of tectogenesis. The results of the research indicate that the predominantly offshore deep-water Black Sea and South Caspian provinces are controlled by tectonic megadepressions formed in the Alpine and recent epochs of tectogenesis. At the same time, both provinces include in their internal structure both elements that arose at different stages of Alpine and recent structure formation, and fragments of older plate and folded structures, reworked in these epochs and buried under Cenozoic or Cretaceous-Cenozoic deposits, to varying degrees. The latter, in turn, partially or completely control the position and configuration of the oil and gas regions within these provinces. Keywords: structural and geodynamic systems; sedimentary basins of different ages; oil and gas source strata; prospects for oil and gas potential; phase composition; hydrocarbon potential.
Estimation of fluid permeability of reservoir rocks at great depths using the fuzzy linear regression method
Authors:   Institute of Oil and Gas of ANAS, Baku, Azerbaijan, Gurbanov V. Sh. , Hasanov A. B. ,   Institute of Oil and Gas of ANAS, Baku, Azerbaijan, Abbasova G. G. ,   Azerbaijan State University of Oil and Industry, Baku, Azerbaijan
Published: January 2023

The possibility of using the theory of fuzzy sets is considered. research in assessing the reserves of hard-to-recover deep-immersed hydrocarbons. At the same time, taking into account the complexity of the relationships between individual petrophysical characteristics, on the one hand, and the uncertainty of relevant information, on the other hand, fuzzy logic and flexible computing methods have been found to be more effective. In particular, the data clustering method (Sugeno fuzzy models) with the selection of child functions (membership functions) was tested. In this method, the prediction of the properties of reservoir rocks at great depths is based on a fuzzy linear regression reflecting the interdependence of properties and the natural uncertainty of information. The method was tested on real indicators of the quality of reservoirs of a well-known group of deposits in the Baku archipelago in Azerbaijan. The results of predicting the expected quality indicators of reservoirs at great depths indicate that in the section of the studied fields at depths of more than 4900 m, a decrease in the relative clay content and density of the reservoirs can be expected, but an increase in the permeability for liquid fluids is also possible. Ketwords: deep-seated; hard-to-recover hydrocarbon reserves; fuzzy set theory; reservoir quality prediction.
Application of machine learning algorithms for refining processes in the framework of intelligent automation
Authors:   Siberian Federal University, Krasnoyarsk, Russia, Bukhtoyarov V. V. , Nekrasov I. S. ,   Siberian Federal University, Krasnoyarsk, Russia, Tynchenko V. S. ,   Siberian Federal University, Krasnoyarsk, Russia,   Bauman Moscow State Technical University, Moscow, Russia,   Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russia, Bashmur K. A. ,   Siberian Federal University, Krasnoyarsk, Russia, Sergienko R. B. ,   Gini Gmbh, Munich, Germany
Published: January 2023

The oil refining industry is facing several challenges and issues in data handling. A large amount of data is generated by many different processes and equipment. This article is devoted to methods for efficient analysis of large amounts of data in an oil refinery. In particular, the effectiveness of machine learning methods for predicting failures of process equipment in the hydrocracking process is investigated. Machine learning, as an important element of digitalization, allows us to successfully solve many production problems. The article describes the application of some machine learning algorithms for solving problems of classifying and predicting failures of hydrocracking process equipment that occur during oil refining and diesel fuel production. The application of random forest methods, principal component analysis and hyperparameter tuning is considered. The effectiveness of these methods is compared on the basis of the Accuracy parameter. It is shown that the combination of these methods will improve the accuracy of the model by 2%. Keywords: automation; machine learning; hydrocracking; simulation; oil refinery.
Improving the quality of turbine flowmeters on the basis of the use of a rotor with internal screw relief
Authors:   Institute of Petroleum and Natural Gas Engineering, Siberian Federal University, Krasnoyarsk, Russia, Bashmur K. A. , Bukhtoyarov V. V. ,   Institute of Petroleum and Natural Gas Engineering, Siberian Federal University, Krasnoyarsk, Russia,   Digital Material Science: New Materials and Technologies, Bauman Moscow State Technical University, Moscow, Russia, Sergienko R. B. ,   Gini Gmbh, Munich, Germany, Sokolnikov A. N. ,   Institute of Petroleum and Natural Gas Engineering, Siberian Federal University, Krasnoyarsk, Russia, Tynchenko Ya. A. ,   Institute of Petroleum and Natural Gas Engineering, Siberian Federal University, Krasnoyarsk, Russia
Published: January 2023

This research aims to improve the quality of measurement of fluid flow rates by turbine flowmeters. The quality criteria for a turbine flowmeter include the accuracy of measurement and the cost of its implementation. To compare the criteria, the article presents a hydrodynamic simulation of the movement of the flow of the working medium through the rotors of the flowmeters of the developed and standard types. The developed type of rotor is a hollow shaft with an internal screw relief. A propeller type of rotor was used as standard. Based on the results of the literature analysis, the purpose of the study was reduced to determining the characteristics of hydraulic resistance that affect the linearity of the flow-pressure characteristics of the flowmeter rotor. The tasks of hydrodynamic computer simulation included its implementation for various indicators of the viscosity of the working fluid - from low-viscosity to high-viscosity. It showed that the use of a rotor with an internal screw relief in a flowmeter reduces the hydraulic resistance of the flow by more than 2 times for any viscosity of the working medium compared to a propeller-type rotor, which significantly reduces the energy costs for moving the flow. At the same time, the linearity of characteristics for both types of flowmeter rotors remains approximately the same in the studied range of characteristics, which indicates a similar accuracy of parameter measurements. Keywords: turbine flowmeter; viscosity; hydraulic resistance; oil transportation; computational fluid dynamics; CFD.
Grip Strength Test In Rodents
Authors:   ConductScience, Corscadden Louise , Singh Anjali
Published: January 2023

The grip strength test is one of the most commonly applied tests in animal laboratories to measure neuromuscular functions or disorders. It was first developed in the 1970s. Today a wide range of techniques are available to study muscle strength in rodents. These methods are categorized into two categories:[2] Invasive method: In situ and in vitro measurements of muscle force are invasive methods. Non-invasive method: This method only includes in vivo measurement tests to analyze muscle force such as treadmill tests, wire hang tests, swimming endurance, vertical pole test, and grip strength tests. The most convenient technique of all tests is the grip strength test. It’s most convenient and causes less stress to animals. The grip test has been widely used in order to investigate the phenotypes of transgenic mice with neuromuscular disease and evaluate potential compounds involved in the motor functioning of organisms. The tests have been serving the purpose for 30 years either alone or in combination with other tests.
Technologies in the Pharmaceutical Industries and Medical Health Care
Authors: J Yuktha H , Kulkarni Gururaj S , Shetty Athmaja , Paarakh Padmaa M
Published: January 2023

This review aims to illustrate upcoming technological developments in the pharmaceutical industries and healthcare facilities may look in the near future. In order to achieve this, we examine recent technologies and advanced medical developments in healthcare as well as in the pharma industries. Such as Artificial intelligence which provides an understanding between process parameters and different formulations. Blockchain is a sophisticated database that stores data in a way that makes it impossible to alter or hack the system. Clouding Technology enhances the drug discovery process. In the Future hospitals will need room for scanning and 3D printing since they can create virtually anything, including medical devices and human body components, and also produce drugs for every individual. Robotics is widely used in surgery as well as in chemical handling in laboratories. IT (Information Technology) is a database that helps in gathering information in surgery departments, hospitals, labs, and clinics. Our geriatric populations' quality of life can be maintained with the aid of new, technologies and innovations in health care. To overcome these obstacles, medical technology, as well as pharma industries, as well as pharma industries must unite and promote, high-quality methods while incorporating them into many related fields.
The Impact of Brand Image and Perceived Value on Consumers’ Purchasing Behavior of Clothing Lines
Authors:   KINFORMS/KAABA, Agdigos Marra Angelique H. , Etpison Maria Christine R. , Patino Armila Augustine C. , Etrata, Jr. Antonio E.
Published: January 2023

Growing businesses everywhere in the world have a far and wide objective of building up their brand image. This research will help in highlighting the defining factors of a brand in which marketers will know how to present their products to consumers which would influence their purchasing behavior. The quantitative research design was utilized together with survey questionnaires in the collection of required data of the respondents regarding the independent variables: brand image and consumer perceived value. The total sample size of 209 respondents was selected through a purposive sampling method, consisting of consumers that reside in Metro Manila with different backgrounds in terms of purchasing clothing lines of brands. The study has identified that brand image has a moderately significant effect on consumers’ purchasing behavior. The research has also shown that a consumer's perceived value has a significant but not strong effect on the consumer's purchasing behavior. In general, brand image and consumers’ perceived value only impact the purchasing behavior of consumers slightly. The consumers are not conscious in terms of the brand image of the clothes they buy as they also prefer cheap but good-quality clothing. This finding has important implications for companies in terms of deciding whether they need to majorly invest their resources in their brand image or not. Also, it aids them in planning in terms of fulfilling the customer's perceived value since it does not have a strong effect on their buying behavior.
Factors on the Adoption Behavior of Digital Wallet: Chinese Youth Perspective
Authors:   KINFORMS/KAABA, Tang Tingting , Mansumitrchai Somkiat
Published: January 2023

The main focus of this paper is to determine the antecedents which significantly affect the attitude toward digital wallet adoption in the context of Chinese youth and to explore the moderating role of demographic and behavioral factors on the relationships between digital wallet adoption and its antecedents. The sample consists of 212 respondents. The multiple regression results indicated that perceived complexity and trialability have statistically significant relationships with digital wallet adoption. Moreover, the moderated regression analysis showed that the frequency of usage significantly moderates the relationship between the intention to adopt digital wallets and relative advantages. The findings of this study not only improve understanding of predictors affecting digital wallet adoption and behavioral differences influencing the degree of adoption but also provide insights for digital wallet service providers to redesign and develop their program to increase customer satisfaction rate.
Dissertation Writing During COVID-19: Student Anxiety and Productivity
Authors: Fraenza Christy , Palermo-Kielb Kimberly
Published: January 2023

Many students across all levels of education experienced disruptions due to stay-at-home orders as part of the response to the COVID-19 pandemic. The purpose of our qualitative study was to specifically explore the doctoral student experience managing the writing of a dissertation amid stay-at-home orders during COVID-19. The majority of participants reported experiencing anxiety more frequently during stay-at-home orders and more productivity before stay-at-home orders. Reasons for decreased productivity during stay-at-home orders included reduced motivation, distractions, and lack of access to outside services and support.
Response of wheat (Triticum aestivum) genotypes to different tillage practices for improving productivity and seed quality in eastern Indo-Gangetic plains of India
Authors: RAM HARDEV , SINGH RAJIV K , PAL GOVIND , KUMAR RAKESH , YADAV M R , YADAV T
Published: January 2023

Quality seed, water, labour scarcity, rising cost of cultivation, diminishing farm profits and indecisive weather conditions are major challenges faced by the farmers under intensive tillage based conventional rice-wheat productionsystem of eastern Indo-Gangetic plains (IGP). To address these challenges from last few years, conservation agriculture (CA) based crop management practices are being developed, demonstrated and promoted in the region. The fieldexperiments were carried out during the winter (rabi) season of 2012-13 and 2013-14 at Indian Institute of Seed Science, Kushmaur, Mau, Uttar Pradesh to evaluate the effect of different tillage practices and genotypes on yield attributes, seed yield, seed quality, and economics of wheat (Triticum aestivum L.). Experiment was laid out in split-plot design consisting of 3 tillage systems, viz. Zero tillage (ZT), conventional tillage (CT) and raised beds (RB) as main-plots and 6 genotypes (KRL 213, HD 2733, PBW 550, HD 2967, KRL 210 and DBW 39) as sub-plots treatments and replicated thrice. Results revealed that among the tillage methods, the highest mean seed and biological yield (4.82 and 10.36 tonnes/ha) were found under ZT followed by CT (4.68 and 10.25 tonnes/ha) and least in RB (3.34 and 7.61tonnes/ha), respectively. Among the genotypes, HD 2967 showed significantly higher mean seed and biological yield (4.72 and 10.28 tonnes/ha) over KRL 210 (3.76 and 8.92 tonnes/ha), PBW 550 (4.10 and 8.95 tonnes/ha) and HD 2733 (4.24 and 9.48 tonnes/ha), respectively. However, genotypes KRL 213 (4.46 and 9.88 tonnes/ha) and DBW 39 (4.42 and 9.42 tonnes/ha) were found on par with HD 2967. The highest tillers/m2 as well as effective tillers/m2 was recorded under ZT system with HD 2967 genotype. However, the highest seeds/spike, spike length and test weightwere found under RB system with genotype HD 2967. There were no significant differences between the tillage systems concerning seed quality parameters, viz. germination %, seedling length, seedling dry weight, vigour index I and II. Moreover, the genotype HD 2967 showed significant difference among all seed quality parameters except germination (%) which was on par with HD 2733, KRL 213 and PBW 550. The maximum mean net returns was recorded under ZT (Rupees 75 500/ha) followed by CT (Rupees 65 600/ha) and RB (Rupees 41 100/ha). The total net gain in income due to adoption of ZT system wasÂ Rupees 17 300 andÂ Rupees 39 400/ha as compared to CT and RB, respectively.
Effect of different cropping systems and nutrient sources on growth, productivity and economics of direct seeded basmati rice (Oryza sativa)
Authors: VERMA RAKESH KUMAR , SHIVAY YASHBIR SINGH , GHASAL PRAKASH CHAND
Published: January 2023

A field experiment was conducted during rainy (kharif) seasons of 2014 and 2015 at New Delhi to evaluate the effects of cropping systems and nutrient sources on growth, root parameters, yield attributes, yields and economics of direct seeded basmati rice (Oryza sativa). On pooled average basis, the highest growth parameters, yield attributes, viz. effective tillers, spike length, grains/panicle and grain weight (g)/spike and yields were associated with inclusion of summer mungbean in the rice-based cropping systems. On pooled average basis, among the nutrient management strategies, 50% recommended dose of fertilizers (RDF) + 25% recommended dose of nitrogen (RDN) through vermicompost (VC) + biofertilizer was found to be best for most of the yield attributes, grain (3.72 t/ha) and straw (7.14 t/ha) yields and gross returns (105.14 Ã— 103 Rupees/ha) followed by 50% RDF + 25% RDN through leaf compost (LC) + biofertilizer. Similarly, the highest root growth length (4.93 cm/cm3), root volume (16.41 cm3) and root dry matter (4.87 g) were registered under treatment 50% RDF + 25% RDN through VC + biofertilizer followed by 50% RDF + 25% RDN through leaf compost (LC) + biofertilizer and then 100% RDF. A strong positive correlation (r2=0.89â€“0.97) was also observed between yield attributes (effective tillers/m2, grains/panicle, grain weight/panicle and panicle weight) and yield of direct seeded basmati rice. Application of 100% RDF proved better and accrued the highest net returns and B: C ratio (1.54). DSBRâ€“wheatâ€“mungbean or DSBRâ€“cabbageâ€“mungbean cropping system in conjunction with 50% RDF + 25% RDN through VC + biofertilizer or 50% RDF + 25% RDN through leaf compost (LC) + biofertilizer significantly improved growth, yield attributes, leading to enhanced productivity and profitability of rice.
Effect of asymmetric warming on rice (Oryza sativa) growth characteristics and yield components under a free air temperature increase apparatus
Authors: XIE XIAOJIN , ZHANG YAOHONG , WANG LIN , YANG XIHUA , YU QIANG , BAO YUNXUAN
Published: January 2023

Climate warming shows great diurnal variations with higher warming rate at nighttime, and consequently causes significant impacts on rice growth and grain yield. The objective of this study was to determine the effects of asymmetric warming (all-day warming, AW; daytime warming from 7:00 to 19:00, DW; and nighttime warming from 19:00 to 7:00, NW; and a control, CK) on rice growth characteristics andyield. Two bucket warming experiments were performed in Nanjing in Jiangsu Province, China under Free Air Temperature Increases (FATI) in 2013 and 2014.< The daily mean temperatures in the rice canopy in the AW, DW and NW plots were 2.0Â°C, 1.1Â°C and 1.3Â°C higher, respectively, than those in the CK plots. Asymmetric warming reduced the maximum tillers and effective tillers in the order CK>DW>NW>AW. In the AW, DW and NW treatments, the effective tillers were decreased by18.57%-37.77% in both years. Asymmetric warming also decreased plant height, the Absolute Growth Rate (AGR), the Soil and Plant Analyzer Development (SPAD) value, the Leaf Area Index (LAI) and the Net Photosynthetic Rate (Pn). The order of the plant height and Pn values were also in the order CK>DW>NW>AW. The warming treatments affect the length of rice growth. The length from the transplanting date to the heading date was shortened by 3.5 days, 2.5 days and 3.0 days on average in the AW, DW and NW plots, respectively, in both years, while the length from the heading date to the maturation date did not show obvious changes. The aboveground biomass in the maturation stage declined by 13.38%, 3.56% and 6.22%, and the grain yield was decreased by 10.07%, 5.06% and 7.89% on average in the AW, DW and NW plots, respectively, in both years. There was a decreasing trend in the panicle number, grain number per panicle and grain filling rate, whereas irregular changes in the 1000-grain weight were observed in the warmed plots. Our results suggested that under the predicted climate warming, rice productivity would be further declined in the Yangtze River Basin.
Các yếu tố ảnh hưởng đến sự căng thẳng với công việc của nhân viên tại Trung tâm kinh doanh VNPT Bình Dương
Authors: Huỳnh Văn Hoàng Lắm
Published: January 2023

Mục tiêu của đề tài nhằm nghiên cứu các yếu tố ảnh hưởng đến sự căng thẳng với công việc của nhân viên tại VNPT tỉnh Bình Dương; từ đó, đưa ra được các giải pháp nhằm góp phần kiểm soát căng thẳng công việc cho các nhân viên tại VNPT tỉnh Bình Dương. Dựa trên bộ số liệu sơ cấp gồm 150 quan sát là nhân viên hiện nay đang làm việc toàn thời gian và có thời gian công tác từ 06 tháng trở lên tại VNPT tỉnh Bình Dương, chọn mẫu theo phương pháp thuận tiện. Phương pháp xử lý số liệu được sử dụng trong đề tài này bao gồm: Thống kê mô tả (tần số, so sánh số tuyệt đối, và số tương đối (%)), phân tích nhân tố khám phá EFA, phân tích hồi quy đa biếnvới sự hỗ trợ của phần mềm SPSS. Kết quả phân tích hồi quy đa biến chỉ ra 05 yếu tố (F1, F2, F3, F4 và F7) có hệ số hồi qui có Sig. nhỏ hơn mức ý nghĩa 1% và 5%, tức có nghĩa các biến này có ảnh hưởng đến Sự căng thẳng với công việc của nhân viên tại VNPT tỉnh Bình Dương, các yếu tố được xếp theo thứ tự tác động giảm dần bao gồm: Áp lực công việc (β=0,775); Mối quan hệ với đồng nghiệp (β=0,394); Mâu thuẫn vai trò (β=0,223); Tính ổn định công việc (β=0,240); Áp lực thời gian (β=0,069).
Financial Technology: Implementation Experience in Some Countries and Policy Implications
Authors: Cao Viet Hieu , Nguyen Minh Hai
Published: January 2023

Digital financial services have flourished from simple peer-to-peer money transfers to advanced financial technologies that make use of the latest technologies in digital banking, distributed ledgers, and central bank digital currencies. Governments, corporations, and individuals may all benefit from new digital financial services. Expanding inclusive economic growth and addressing the Sustainable Development Goals can be accomplished through the development of inclusive digital financial services in an environment with the right regulatory framework and policies. The number of financial technology (Fintech) companies globally has grown, attracting billions of dollars new investments in recent years. However, Fintech companies remain relatively small compared with traditional financial service providers in developed countries. In contrast, Fintech services and products are becoming economically important in some developing countries. The article summarizes the experience of implementing Fintech in some high-ranked Fintech countries such as the United States, United Kingdom, Singapore, Australia, China and Indonesia; thereby providing policy implications for regulators in Vietnam.
Thực trạng và một số giải pháp nâng cao hiệu quả quản lý Nhà nước về đầu tư trực tiếp nước ngoài (FDI) ở Việt Nam
Authors: Nguyễn Thanh Cai
Published: January 2023

Trong xu thế toàn cầu hóa kinh tế quốc tế và cuộc cách mạng khoa học công nghệ 4.0 diễn ra mạnh mẽ, đối với các nước đang phát triển như Việt Nam, trong lúc nguồn vốn tích lũy trong nước còn hạn chế, các nước đều cần phải thu hút nguồn vốn đầu tư từ nước ngoài nhằm đáp ứng nhu cầu đầu tư phát triển sản xuất kinh doanh, chuyển giao khoa học và công nghệ, đẩy nhanh tốc độ tăng trưởng kinh tế, giải quyết công ăn việc làm và tăng thu nhập cho người lao động. Bằng phương pháp thu thập dữ liệu đã được công bố, thống kê, phân tích, tổng hợp, liên hệ so sánh, bài viết đánh giá thực trạng công tác thu hút và quản lý nhà nước về đầu tư trực tiếp nước ngoài ở Việt Nam giai đoạn 2010-2020, chỉ ra những tồn tại hạn chế, trên cơ sở đó đề xuất một số giải pháp thiết t
Phát triển hoạt động nghiên cứu khoa học trong các trường đại học ở Việt Nam
Authors: Cao Thanh Phước , Phan Quốc Cường , Lê Văn Cường
Published: January 2023

Hoạt động nghiên cứu khoa học có vai trò quan trọng trong việc góp phần nâng cao chất lượng đào tạo, tạo ra nguồn nhân lực chất lượng cao đáp ứng nhu cầu xã hội. Trường đại học là nơi đào tạo, bồi dưỡng nguồn nhân lực trình độ đại học, sau đại học đồng thời là cơ sở nghiên cứu khoa học. Hoạt động nghiên cứu khoa học của trường đại học trực tiếp tham gia vào quá trình nâng cao chất lượng công tác giáo dục, đào tạo của nhà trường. Bài viết phân tích thuận lợi, khó khăn trong thực tiễn hoạt động nghiên cứu khoa học của các trường đại học ở Việt Nam hiện nay. Trên cơ sở đó, xác định nguyên nhân và đề xuất các giải pháp phát triển hoạt động nghiên cứu khoa học trong các trường đại học ở Việt Nam.
Phong cách Hồ Chí Minh góp phần bồi dưỡng, hoàn thiện nhân cách cho cán bộ, đảng viên hiện nay
Authors: Nguyễn Văn Thuyên , Nguyễn Thị Thùy Giang
Published: January 2023

Phong cách Hồ Chí Minh là những đặc trưng giá trị về nhân cách, phương pháp, tác phong, đạo đức và lối sống của Hồ Chí Minh, gắn liền với nhân cách trí tuệ lỗi lạc, đạo đức trong sáng, lối sống bình dị của một vị lãnh tụ kính yêu của dân tộc. Phong cách đó vừa mang tính dân tộc vừa mang tính hiện đại, vừa khoa học vừa cách mạng, vừa cao cả vừa thiết thực. Phong cách Hồ Chí Minh được thể hiện trong mọi lĩnh vực sống và hoạt động của Người, thông qua một số biểu hiện về sống cần, kiệm, liêm, chính; sống hài hòa kết hợp nhuần nhuyễn văn hóa Phương Đông và Phương Tây; tôn trọng quy luật tự nhiên, gắn bó với thiên nhiên. Tất cả những biểu hiện đó luôn được Hồ Chí Minh đặc biệt quan tâm và thực hiện nhất quán, xuyên suốt trong cả cuộc đời và sự nghiệp hoạt động cách mạng của Mình, với một nhiệt huyết của một người cộng sản kiên trung “phụng sự Tổ quốc, phục vụ nhân dân”, phấn đấu vì mục tiêu độc lập dân tộc và chủ nghĩa xã hội. Phong cách Hồ Chí Minh góp phần bồi dưỡng, hoàn thiện nhân cách cho cán bộ, đảng viên hiện nay
Tín ngưỡng thờ cá Ông của người dân Cần Giờ thông qua di tích Lăng Ông Thủy Tướng
Authors: Du Quốc Đạo
Published: January 2023

Huyện Cần Giờ thuộc Thành phố Hồ Chí Minh - một trung tâm kinh tế, văn hóa bậc nhất của cả nước; do đó tín ngưỡng dân gian ở Cần Giờ vừa có nét chung của Nam Bộ pha lẫn với những sắc thái riêng của Trung Bộ. Ngay từ thuở xa xưa, biển đã tác động và tạo nên những giá trị trong văn hoá vật chất và tinh thần của cộng đồng cư dân Cần Giờ. Do cuộc sống phải gắn liền với biển để hoạt động mưu sinh nên yếu tố văn hóa biển chi phối rất rõ nét đến tín ngưỡng - tôn giáo của người dân Cần Giờ. Trong đó, tín ngưỡng thờ cá Ông là phổ biến nhất. Tín ngưỡng thờ cá Ông là nét sinh hoạt văn hóa đặc trưng của cư dân nơi đây, hàm chứa nhiều giá trị nhân văn sâu sắc, hướng người dân tới những điều tốt đẹp trong cuộc sống. Tín ngưỡng thờ cá Ông được thể hiện rõ qua Lăng Ông Thủy Tướng tọa lạc tại thị trấn Cần Thạnh, huyện Cần Giờ. Lăng Ông vừa là địa điểm tâm linh nổi tiếng đang thờ cúng bộ xương cá Ông dài khoảng 12m vừa là nơi thu hút một lượng lớn khách du lịch khi đặt chân tới vùng đất Cần Giờ.
Điều khiển LQR cho hệ bóng thanh trục lệch: mô phỏng và thực nghiệm
Authors: Phạm Văn Chinh , Hoàng Duy Tân , Nguyễn Văn Đông Hải , Nguyễn Trung Dũng , Lương Minh Đạt , Dương Hoàng Nam , Ngô Trần Minh Tú , Đặng Thái An
Published: January 2023

Hệ bóng thanh trục lệch là một hệ thống một vào nhiều ra (single input-muti output – SIMO) thường được sử dụng trong các phòng thí nghiệm để kiểm chứng giải thuật điều khiển. Trong bài báo này, chúng tôi xây dựng và khảo sát một bộ điều khiển LQR trên ở mô phỏng. Bộ điều khiển chứng minh khả năng điều khiển cân bằng hệ thống ở các vị trí đặt khác nhau. Tiếp đến, chúng tôi tiến hành khảo sát bộ điều khiển trên ở đối tượng bóng thanh trục lệch thông qua board điều khiển STM32F4. Thông qua mô phỏng và thực nghiệm, bộ điều khiển LQR của chúng tôi đã thành công điều khiển hệ thống. Ngoài ra, các quy luật điều chỉnh thông số điều khiển cũng được kiểm chứng và tổng kết lại.
Groundwater Investigation by Combined Vertical Electrical Sounding and Magnetotelluric Sounding in Eastern Region of Mekong Delta, in the South of Vietnam
Authors: Nguyen Van Giang , Nguyen Trong Vu , Nguyen Huy Vung
Published: January 2023

In the Eastern Region of Mekong Delta (South Vietnam) may contain brackish or saline water from land surface to great depth, both superficial Quaternary and deep Tertiary Alluvium. The combination of two geophysical methods, the Vertical Electrical Sounding (VES) for shallow investigation, and the Magnetotelluric Sounding (MTS) for deep investigation, provides a complete electrical image of the sedimentary series from the surface to the deep crystalline basement. It turns out very efficient to delineate the groundwater contamination in both superficial and deep aquifers. The combined results reveal a close correlation of the extent of the contamination with the paleogeomorphology of laterites, and subsequently with the paleorelief during the Tertiary and Quaternary times. Because this study area is very complicated hydrogeological structure, it is necessary to survey the current status of deep-water storage floors with geophysical measurement technologies to prevent groundwater pollution when exploiting groundwater here.
Tổng quan về đặc điểm thực vật và tác dụng dược lý của cây Quăng - Alangium salviifolium (L.f.) Wang.
Authors: Đặng Thị Lệ Thủy , Lý Hồng Hương Hạ , Nguyễn Thế Nhựt , Nguyễn Thị Hồng Yến , Võ Khôi Nguyên , Võ Thị Ngọc Điệp , Lê Trần Thanh Nguyên , Võ Hiền Vinh
Published: January 2023

Cây Quăng (Alangium salviifolium (L.f.) Wang., Alangiaceae) là một dược liệu quý của Việt Nam nhưng lại ít được quan tâm đến. Để làm tiền để cho các nghiên cứu sau này, nhóm tác giả đã tổng hợp các tài liệu về cây Quăng: thực vật học, các thành phần hoá học chủ yếu của các bộ phận của cây như alkaloid, flavonoid, streroid, terpenoid, tannin, polyphenol. Một số tác dụng được lý của cây đã được nghiên cứu như tác dụng kháng khuẩn, kháng nấm, chống oxy hoá, kháng viêm, giảm đau, chống ung thư, độc tế bào, chống loét dạ dày, bảo vệ gan, hạ đường huyết và lợi tiểu. Bài tổng quan này góp phần vào việc định danh và định hướng cho các nghiên cứu sau này về dược liệu cây Quăng - Alangium salviifolium (L.f.) Wang..
Ezequiel Urviola. Basta con que haya vivido
Authors: Espezua Salmón Boris Gilmar
Published: January 2023

En el presente trabajo, nos proponemos abordar el tránsito de Ezequiel Urviola, como un personaje singular que en forma ontológica quiso ser indio, en un proceso de transculturización y descolonización y que tanto su compromiso por el mundo andino, como por las causas de su discrimina-ción y sus luchas por sus reivindicación le han servido para que constituya un faro en el doloroso proceso de visibilización y redención del compatriota in-dígena en nuestro país que aún tiene muchas deudas históricas que cancelar, muchas heridas que resanar, para que podamos prefigurar un país diverso, intercultural y definitivamente que sea un nación legitima e identitaria con igualdad de derechos fundamentales.
El problema de los problemas en el perfil de la tesis de investigación jurídica
Authors: Casazola Ccama Juan
Published: January 2023

En este escrito me centro en uno de los factores que contribuye a esta realidad, como aquellas posturas contradictorias acerca del plantea-miento del problema de investigación. El propósito es hacer notar que, la tradición positivista, con altos grados de criterios de pureza conceptual y metodológica en la investigación jurídica, no ha permitido el diálogo y cam-bios en la postura epistemológica. Sostengo que la investigación cualitativa es un campo fértil para fortalecer la interactividad sobre la unilateralidad, el carácter vivencial entre quienes poseen el conocimiento científico; así como, los saberes sociales, saberes populares, en la perspectiva integral de la ecología de saberes, como el estudio de todas las ciencias existentes en el mundo.
Interpolative fuzzy Z-contraction with its application to Fredholm non-linear integral equation
Authors: Jain Shobha , Radenovic Stojan
Published: January 2023

The aim of this paper is to introduce the notion of interpolative fuzzy Z-contractive condition for a pair of self maps in a fuzzy metric space, which enlarges, unifies and generalizes the existing fuzzy contractions (by Gregori and Sapena [6]), ψ contraction (by Mihet [11]), fuzzy Z-contractions (by Shukla et al. [21]) and Tirado contraction (by Tirado [22]), which are for only one self map. Using this, we establish a unique common fixed point theorem for two self maps satisfying condition (S), which was introduced by Shukla et al. in [21] through weak compatibility. As an applications, we discuss fixed point theorem for Fredholm non-linear integral equation. The article also includes an example, which shows the validity of our results.
On multiplicity-free induced representations of a homogeneous tree
Authors: Milan Hervé Atché , Toure Ibrahima
Published: January 2023

Let Tq, n be a homogeneous rooted tree, let K be a subgroup of Aut(Tq, n), the group of automorphisms of Tq, n, and let τq, ℓ be a unitary irreducible representation of K. In this paper, we construct some multiplicity-free irreducible representations of Aut(Tq, n). We also give a necessary condition for (Aut(Tq, n), K) to be a strong Gelfand pair.
Study of elliptic curve over a finite ring F_{3^d}[ε], ε^4 = ε^3
Authors: Selikh Bilel
Published: January 2023

Let F3d be a finite field of order 3d with d∈ N*. In this paper, we study the elliptic curve over the finite ring F3d[ε] :=F3d[X] / (X4 -X3), where ε4 = ε3 of characteristic 3 given by the homogeneous Weierstrass equation of the form Y2Z = X3 + aX2Z + bZ3, where a, b ∈F3d[ε], such that we study the arithmetic operations of this ring and define the elliptic curve over it. Next, we show that EΠ0(a), Π0(b)(F3d) and EΠ1(a), Π1(b)(F3d) are two elliptic curves over the finite field F3d, such that Π0 is a canonical projection and Π1 is a sum projection of coordinate of element in F3d[ε] and we conclude by given a classification of elements in elliptic curve over the finite ring F3d[ε].
The bigraded Hilbert function of unions of lines in the 3-dimensional flag variety
Authors: Ballico Edoardo
Published: January 2023

Let F⊂ P2× P2v be the 3-dimensional flag. Let π1 F→ P2 and π2 F→ P2v be the projections. For all u,v ∈N\{(0,0)} let M(u,v) denote the set of all curves π1-1(F) ∪ π2-1(E) such that π1-1(F) ∩ π2-1(E)=∅, #F=v and #E=u. Any A∈ M(u,v) has u+v connected components, all of them smooth and rational and embedded as lines by the Segre embedding of F⊂ P2× P2v. In this paper we study the bigraded Hilbert function H0(IA(a,b)), (a,b)∈N2, for a general A∈M(u,v). We also give geometric properties of IA(a,b) (spannedness and a uniqueness result for non-general A∈ M(u,v)).
Solutions of fractional foam drainage and Zakharov-Kuznetsov equations using a new algorithm
Authors: Kumar Manoj
Published: January 2023

The Daftardar-Gejji Jafari Method (DGJM) has been used extensively in the recent one and a half decades to solve various non-linear equations such as algebraic equations, integral equations, partial differential equations, ordinary and fractional differential equations and so on. In this paper, we present a new time-efficient algorithm for DGJM for solving non-linear fractional foam drainage and Zakharov-Kuznetsov equations. We compare the DGJM solutions with those obtained by the Adomian decomposition method and the homotopy perturbation method. The obtained results reveal that the new algorithm of DGJM is more effective and time-efficient for predicting the solutions to such problems that too without calculating tedious calculations such as finding Adomian's polynomials and constructing homotopy function.
Inequalities for a class of composite polynomials
Authors: Mir Mohd Yousf , Shah Wali Mohammad
Published: January 2023

In this paper, we establish some inequalities for a more general class of polynomials P(S(z)), where P(z) = ∑ ajzj and S(z) = ∑ bjzj of degree n and m respectively. These results not only generalize the results due to Dubinin [ J. Math. Sci., 143 (2007), 3069-3076] but also refine a result due to Shah and Liman [ NFAA, 9(2004), 223-232].
New records of Lepidoptera hostplants from Portugal (Insecta: Lepidoptera)
Authors: Nunes J.
Published: January 2023

141 new hostplants are added to 100 Lepidoptera species from mainland Portugal, as result of the author’s fieldwork from 2010 to 2020. The majority of records are consistent with hostplant records from other European countries and confirm the wide range of polyphagy of some species.
Digestive system formation during metamorphosis of Carposina sasakii Matsumura, 1900 (Lepidoptera: Carposinidae)
Authors: Xue O. , Feng D. , Men L. , Zhang Y. , Li J. , Den A. , Peng Y. , Ma R. , Zhang Z.
Published: January 2023

The purpose of this study is to investigate the adaptive mechanism of morphological and structural changes to habits, during the metamorphosis development of Carposina sasakii Matsumura, 1900. Traditional dissection, paraffin section, and scanning electron microscopy techniques were used to study the morphological structure and cytohistology of the digestive system in different developmental stages of C. sasakii by classical comparativemorphology study. In order to adapt to the change of feeding habits from solid in the larva stage to liquid in the adult stage, the digestive tract of C. sasakii reconstructed in the pupal stage. The crop of the foregut transformed from a spherical shape in the larval stage to an enlarged lateral, accessory, bag-like structure beyond middle of pupal stage and in the adult stage. The hindgut transformed from a columnar structure in the larval stage to a dilated rectal sac at the end of the hindgut in the adult stage. The morphological changes of the digestive tract provided the basis for theC. sasakii to adapt to the changes of food habits and environment. In addition, the present study provides a basis for better understanding of pupal reconstruction of digestive tract. It also lays the foundation for the nutritional physiology and co-evolution between C. sasakii at different stages and its host plant, while providing morphological data for the toxicological and pathological research of this significant agricultural pest.
Theresimima ampellophaga (Bayle-Barelle, 1808) rediscovered in the Republic of North Macedonia by using sex attractant traps (Lepidoptera: Zygaenidae)
Authors: Nahirnic-Beshkova A. , Beshkov S. , Kucherenko E. E. , Efetov K. A.
Published: January 2023

Theresimima ampellophaga (Bayle-Barelle, 1808) was known from only three sites in North Macedonia and has never been considered as a pest of grapevine in this territory. The last time it was recorded in North Macedonia about 80 years ago. Traps baited with synthetic sex attractant EFETOV-2 (racemic mixture of (2R)-butyl 2-dodecenoate and (2S)-butyl 2-dodecenoate) were set at two localities near Ohrid Lake at Trebenishta village and between Ljubanishta village and Sveti Naum Monastery in 2016, in Vardar river valley near Demir Kapija in 2017 and near Dojran Lake in 2018. In North Macedonia sex attractants were used for the detection of this species for the first time. We recorded Th. ampellophaga in traps at all four monitored localities.