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Tunneling in urban areas is growing in response to the increased needs for efficient transportation. Many urban tunnels are constructed in soft ground at shallow depths. Metro tunnels are usually constructed as twin-parallel tunnels and their adjacent constructions may lead to surface deformation, affecting the surface environment and the safety of the tunnels. Shield tunnelling is a commonly used as construction technique because it is very effective in reducing ground deformations and thus damage to urban infrastructure. The paper presents a 3D simulation of shield tunneling machines via the finite element code Abaqus and analysis model of ground surface settlements induced by a construction of twin-parallel tunnels. The results show that ground surface settlements induced by a construction of the left tunnel causes surface settlements of about 22÷24 mm and after the construction of both tunnels, it will cause ground subsidence has the greatest value of 33÷35 mm.

If the raw error appears in set of measuring data, it affects significantly on adjustment results and displacement values of monitoring points, thus conclusion about displacement of works is incorrect. The method of robust estimation by posterior variance for detecting the raw error bases on principle of choosing weight of robust estimation, this is the other type that belong to the least square statistical estimation, which is used to process the measuring data with raw error when they were given into random model of the adjustment problem. Through processing data of Son La hydroelectricity construction network, the obtained result proved that the method good efficiency, it not only finds the measuring value that contains the raw error, but also determines the value of the raw error nearly accurately, moreover, it is able to detect many raw error in the set of data.

One of the most important achievements of applying radioactive isotope in the geological study is to determine the age of mineralization. Based on the synthesis, comparison, and evaluation of the popular isotopic systems in dating mineralization, the Rb - Sr, Re - Os, and Ar - Ar dating methods are discussed in this study. The results show that the Rb - Sr dating method is likely to be successfully applied to sulfide mineralization. If the mineralization contains little or no sulfide minerals, then the method is applied to other minerals in an ore mineral association. The Re - Os dating method has shown great success when it is applied to hydrothermal deposits, especially for the molybdenite - bearing vein deposits. The limitation of the method is that when the concentration of the Os element in molybdenite is low, it is difficult to establish the Re/Os ratio in a single mineral. The Ar - Ar isotope system for dating mineralization often uses mica or feldspar minerals, which are minerals with blocking temperatures ranging from 150÷350 0C, and later metamorphic periods have higher than 350 0C often overprinted these minerals. Generally, tectonic, magmatic, and metamorphic events, which occur after mineralization, can cause difficulty in determining the age of mineralization and collecting analysis samples.

The article shows some results about establishes types of environmental conflicts in mineral activities base on applying a combination of analytical methods, document synthesis, investigation methods, statistics, community interviews and expert opinion. In Lao Cai province, there are many mineral resources such as copper, iron, apatite, kaolines - felsspat, limestone, clay, sand, gravel, etc., being exploited. Mining projects often use large amount of land areas. The process of mining and processing are polluting more and more seriously day by day. This is the main cause leading to environmental conflicts in study areas. The research results have evaluated and identified the types of environmental conflicts relating to mineral exploitation activities in Lao Cai province. They consist of conflict between mineral exploitation and natural environment (water, air); conflict between mineral exploitation and other natural resources (land, forest, etc.); conflict among social interest groups. Besides, we have proposed general and specific solutions to prevent and minimize the harmful effects of environmental conflics for sustainable development suitable to the socio - economic conditions of Lao Cai province.

At present, systems of infrastructure are built and developed very strongly in Hanoi. The metro tunnel system is also being designed and built in Hanoi to meet the requirements of economic and social development. The paper uses analytical methods (the Wang's method, Penzien’s method), hyperstatic reaction method and a numerical analysis method by Abaqus software to evaluate the effect of the strongest earthquake that could occur in to the lining tunnel in Hanoi metro system. Based on results obtained from assessing the effect of earthquakes to the lining tunnel in Hanoi metro system, this paper has compared and commented to these results for the purpose of finding the most accurate results about the impact of earthquakes on the lining tunnel in Hanoi metro system. These results and comments will be used in the design and construction tunnel in the Hanoi metro system under the impact of the earthquakes that could occur in Hanoi.

The paper represents the hypothesis test method that can determine the instability control points of the reference network in the displacement of construction. Regarding data processing in displacement monitoring, the detection and modification for instability points is an important task because this affects the computation of the displacement of monitoring points. This method has been applied in many countries over the world but not in Vietnam, and it is processed through two steps including the global statistics test and local statistics test. The global statistics test is to identify whether a control point is stable or not. The local statistics test based on the division of groups is to find the unstable control points exactly. Experimental computation is carried out in two monitoring cycles at Hoa Binh hydroelectric plant. In this experiment, this algorithm detected two unstable points among six control points. This result is in agreement with the result that is solved by Vietnam’s construction standard of TCVN 9399:2012. In conclusion, the hypothesis test method completely can apply in real geodetic production in Vietnam.

The garnet-bearing schists of the Nam Co formation have an identical mineral assemblage consisting of garnet, chlorte, albite, quartz and muscovite, together with accessory apatite, zircon, monazite, xenotime, and ilmenite. An aggregate of muscovite and chlorite defines the major foliations (Sn). Both albite and garnet occur as a porphyroblast, ranging in size 0.2÷1 mm and 0.5÷1.2 mm, respectively. Albite porphyroblasts commonly have the curved to sigmoidal inclusion trails defined by graphitic materials (Sn-1). Garnet porphyroblasts in the sample is generally characterized by paucity of inclusions and retrograde corona of bitotite and chlorite. Garnet also occurs as an inclusion within albite porphyroblast. Porphyroblastic garnet shows the compositional zonation typified by a bell-shaped spessartine profile balanced by increasing almandine from core to rim. Whereas, inclusion garnet is homogeneous compositions with rich in almandin and poor in spessatin, pyrop and grossula. All the above microstructures suggest two deformation and metamorphic stages (M1 and M2) that were affected to politic rocks of the Nam Co formation, Song Ma suture zone.

Spatial big data has a large scale and complex, therefore, it cannot be collected, managed, and analyzed by traditional data analytic software shortly. These platforms in many situations are restricted to vectors data. However, the raster data generated by the sensors on the enormous number of satellites now needs to be processed in parallel on the cluster environment. The article introduces the satellite image data analyzing method using the RasterFrames library on the Apache Spark platform. The RasterFrames library examines raster data for Python, Scala, and SQL, bringing the power of Spark DataFrames to access to Earth Observation, cloud computing, and data science. In the experimental part, the NDVI and the change in the average value of NDVI in the time series are calculated to demonstrate the vegetation mantle changes in Phu Tho province. These results are the reference data source in the assessment of weather, climate, and environmental changes in the study area during that time.

Land cover/land use classification using high spatial resolution remote sensing data has the biggest challenge is how to distinguish object classes from different spectral values based on structures, shapes, and spatial elements. This paper focuses on the object-oriented classification method to extract artificial surface at industrial area by Worldview-2 data with a spatial resolution of 1.8 m. Extraction of 05 types of land cover/land use using object-oriented classification method based on reflectance spectral characteristics, shape index, location of objects, brightness, NDVI index, and density objects are archive efficiency to the quality of classification results. The overall accuracy of classification result for land cover/land use of Thang Long industrial area is about 0.85 and Kappa index is about 0.81.

Due to the effects of dynamic pressure, the stress distribution of rock mass is very complex. The reason for this could be a risk of stability loss for an auxiliary tunnel system constructed within the study area. In this article by using Flac3D software the author simulated two adjacent working faces with the thickness of 5 m natural coal pillar. Three factors: the upper working face excavation process, auxiliary tunnel mining process, and the location of lower working face, affected by deformation, stress distribution, safety of lower floor area and surrounding rock mass of tunnel. The research results show that during the excavation, the mechanical behavior of the rock mass surrounding the auxiliary tunnel showed displacements, volatility, and phase characteristic. The displacement on the auxiliary tunnel boundary in both excavation and working face cases showed that the roof and the left side wall displacement was greater than the right side wall and the bottom. Therefore, the distance between the auxiliary tunnel and the empty mining space needs to be computed to meet technical and economic requirements.

In Vietnam, agriculture development is one of the most important tasks to secure food resources and reduce poverty. The north of Vietnam is the high mountain areas which are in the low development stage, agriculture is the main source of income of households. Ha Giang is a typical mountainous province, in which land management is very important in the development of economic. To get good land management, land evaluation is needed. The land quality evaluation is an important step in the land evaluation process. The paper presents the application of a geographical information system (GIS) and establish the land quality map in Ha Giang province in accordance with the Food & Agriculture Organization framework. The evaluation process starts from defining the land quality indicators which are in 4 categories: Climatic, Terrain, Soil, and Hydrological. The indicators are standardized and classify according to the FAO land quality evaluation system, all of data is processes in GIS environment, each indicator is a data layer in GIS database. The result is maps of indicators and the land quality map of Ha Giang province. There are 126 land quality units in which, more than half of them are of Feralsol. The result of the study can be used in various fields of management as agriculture, land use, infrastructure development,…

Consolidation parameters of soft soil play an important role in calculating settlement and soft soil improvement by vertical drainage method (distance, quantity, treatment time). In this study, using oedometer tests, consolidation parameters of some soft soils in the North Central coastal region, Vietnam are clarified. The research results show that the compression index Cc has a strong relationship with the natural water content, liquid limit, dry unit weight, and void ratio of the soil. The consolidation coefficient significantly depends on the applied pressure level, at the over-consolidation stage (normal stress is less than pre-consolidation pressure), the consolidation coefficient is high. By contrast, at the normal consolidation stage (normal stress is greater than pre-consolidation pressure), the coefficient of consolidation is small. The pre-consolidation pressure of soil changes with the distribution depth.

The management, collection and treatment of domestic solid waste in rural areas are of great significance to reduce its amount generated to the environment. The study has determined that the total amount of rural domestic solid waste generated in Nam Dinh province is 660 tons/day with the average amount of 0.31 ÷ 0.35 kg/person/day and the collection rate is 87 % (about 575 tons/day). The amount of organic in the solid waste is about 60% of total solid waste. Currently, the solid waste is not separated at the source. Specifically, 47 % solid waste (about 112,968 tons/year) is treated by landfilling. Besides that, 43 % solid waste in this province is burned in the incinerator. In the areas where the collection conditions face difficulties, local people self-treat domestic solid waste at home by burning, burying, or composting it, which accounts for 10.0 % of the total amount. In this province, one of the well – known private companies, Tan Thien Phu has manufactured incinerators with the LOSHIHO brand having capacity up to 1,000 tons/day. Combustion method can be used at the sanitation landfill to reduce the volume of wastes brought to burial sites and limit the environmental pollution. Therefore, to achieve sustainable development in this province, it is necessary to improve solid waste management with solutions relating to the separation, collection, storage and treatment of domestic solid waste.

This paper presents the results of research on the possibility of using the sea sand in the soft soil treatment by the cement - reinforced pile method. The sea sand is available material with a huge amount of storage which effective using the coastal traffic works. Therefore, research on the possibility of using the sea sand in the soft soil treatment by the cement - reinforced pile method is necessary. The results of the research are determined the effect of cement content on strength and elastic modulus in the cement - reinforced pile method, which contributes to supplementing and completing in the soft soil treatment. The research has high feasibility and practical significance.

Soil nailing is one of the soil reinforcement techniques that has been used worldwide in geotechnical engineering. In Viet Nam, soil nailing technology applied in a number of transportation investments such as Ha Long - Van Don, Bac Giang - Lang Son highways, and some of the hydropower plants in the central provinces of Viet Nam. Soil nailing is a system consisting of reinforced concrete piles and rebars or composite rods installed in an inclined direction into the slope. The research and applications of soil nailing technology to reinforceslopes in Viet Nam have not been widespread. The authors only considered construction technologies, processes, requirements for the materials, equipment, quality - check of soil nails, etc. The optimal geometries of soil nails for the stability of slope are inadequate and analyzed thoroughly. These lead to inaccurate prediction of the construction stabilization effect and the safety of designed structures. In the present study, numerical simulations were conducted to investigate the effects of the inclined angle and the length of soil nail Patterns and subjected to surcharge loads on stability improvement of soil - nailed slopes and facing deformation in a staged - excavation. The research results show that the soil nail reinforcement efficiency could be affected by inclinations and length Pattern s of soil nails. The general conclusion is that the more soil is nailing inclinations, the more the reinforcing forces in the soil nails. The soil nail length Patterns have also influenced displacement characteristics of slopes.

Static liquefaction of soil is a hazard that has caused a lot of damage to humans. Therefore, this phenomenon has been studied for a long time over the world, nevertheless, research on this issue in Vietnam is still limited. This paper presents the results of several triaxial tests under undrained conditions to evaluate the influence of some fundamental factors on the static liquefaction of Fontainebleau sand. The results show that the relative density and the confining pressure have a significant influence on the static liquefaction of the sand. When the density of the sand increases, the liquefaction resistance of the sand increases, until a certain limit, the sand changes from liquefaction behavior to dilatancybehavior with a decrease in pore pressure and an increase in mean effective stress. When the test is carried out at different confining pressures, the greater the confining pressure, the higher the liquefaction resistance.

Blasting is considered as one of the most effective methods for rock fragmentation in open - pit mines. However, its side effects are significant, especially blast - induced ground vibration. Therefore, this study aims to develop and apply artificial intelligence in predicting blast - induced ground vibration in open - pit mines. Indeed, the k - nearest neighbors (KNN) algorithm was taken into account and developed for predicting blast - induced ground vibration at the Deo Nai open - pit coal mine (Vietnam) as a case study. An empirical model (i.e., USBM) was also developed to compare with the developed KNN model aiming to highlight the advantage of the KNN model. Accordingly, 194 blasting events were collected and analyzed for this aim. This database was then divided into two parts, 80% for training and 20% for testing. The MinMax scale and 10 - fold cross - validation techniques were applied to improve the accuracy, as well as avoid overfitting of the KNN model. Root - mean - squared error (RMSE) and determination coefficient (R2) were used as the performance metrics for models’ evaluation and comparison purposes. The results indicated that the KNN model yielded better superior performance than those of the USBM empirical model with an RMSE of 1.157 and R2 of 0.967. In contrast, the USBM model only provided a weak performance with an RMSE of 4.205 and R2 of 0.416. With the obtained results, the KNN can be introduced as a potential artificial intelligence model for predicting and controlling blast - induced ground vibration in practical engineering, especially at the Deo Nai open - pit coal mine.

For the purpose of ensuring sustainable development, one of the important factors is to increase labor productivity and minimize the number of workers directly working in the mine. In the context of increasing requirements for underground coal mining, the number of workers tends to decline due to shifting to other types of economy. Therefore, the mechanization investment in coal mining is the inevitable destination, which guarantees the long - term strategic development of the coal mining industry. Although the mechanized mining has obtained several achievements, the annual coal mining output is still not high, specifically reaching 73.8%; 51.3%; 61.4% according to the plan respectively for the years of 2013, 2014 and 2015. A total of mechanized lines has been invested and applied in Vietnam National Coal - Mineral Industries Holding Corporation Limited, but there are only six lines in operation until at this time. For five recent years, when the mining industry has accumulated a lot of experience in using mechanization technology, it is found that the potential factors causing production interruption have resulted in the effectiveness of these longwalls not achieved as expected. Summary of advantages, difficulties, and unsuccessful implementation of mechanization technology in the condition of Quang Ninh mine area has shown a big gap in production organization that should be specifically studying. In this study, the author wants to build a basic background in determining the impact of potential factors conscious of the longwall mechanized.

Elevation of the water level in the reservoir is the main reason for the deformation of the hydropower dams. Thus, assessing the influence of this cause on the displacement of construction is extremely necessary, which helps understand the state of dam and evaluate its safety to prevent sudden accidents that damage people and properties. Therefore, the article researches theoretical basis and builds the procedure of data processing in the algorithm of least squares to calculate the subsidence value caused by the influence of water - level elevation on the dam. The monitoring data of Yaly hydroelectric dam at two positions M5 and M26 was used in the experimental calculation. The results indicated that when the highest water level is 515.53 m, the subsidence values caused by this factor at M5 and M26 were 5.2 mm and 0.2 mm, respectively. On the other hand, when the lowest water - level is 491.2 m, the subsidence values caused by this factor at M5 and M26 were -7.7 mm and -1.9 mm, respectively. This demonstrates that the proposed calculating method is entirely feasible, reliable, and suitable for every hydroelectricity dam.

Energy plays a very important role in the development of a country in many aspects of economic, social, environmental to security and defense. Correct forecasting of energy demand will make an important contribution to the implementation of energy, socio-economic and environmental policies and ensure the sustainable development of the country. Therefore, the selection of an appropriate energy forecasting model will play an important role in setting appropriate strategies and policies in the future. This article will synthesize energy forecasting models in the world, in-depth exploration of the POLES model and consider its applicability in energy forecasting in Vietnam.

One of the important contents to achieve the goal of modernization of the height system is connect the levelling observations between national levelling order I, II to the national GNSS Continuous Operating Reference Stations and the national gravity marks. Today, Vietnamese surveyors commonly use Geoid model 2010 that built based on more than 3000 gravity marks and over 800 GPS-levelling points. The processing combined GNSS-levelling and gravity obervations to improve the Geoid model for archiving accuracy from 4 to 10 centimeters, that can be possible to apply topographic heigh using GNSS accurately instead of traditional levelling is necessary for geomatics and mapping in Vietnam. There are some researchs in the literature aim to improving geoid model. In these research, the interpolation methods are mainly discussed such as collocation, linear function order 1, 2 or spline function. In this paper, the objective is to consider and propose a method of data processing using theothy of adjustment with contrainned codition and analyze the covariance matrix of the input data.

The article points out the shortcomings in the labor arrangement at the 11th long wall. The analysis results have shown: (i) The actual number of employees assigned to use is often much higher than expected. It is because Ha Lam Coal Joint Stock Company only designs for good conditions, but actually, the company faces many obstacles due to the characteristic production conditions; (ii) the actual productivity is much lower than the designed labor productivity because the calculation of the number of employees is not consistent with the production conditions of the long wall; at the same time, the number of manual workers for ancillary work is too much arranged according to actual needs; (iii) The current level of direct labor productivity at the 11th long wall is still low compared to the actual capacity, not motivating workers to increase labor productivity. The solutions to overcome the problems are (i) Complete the calculation of the number of employees considering the specific production conditions and the number of auxiliary workers; (ii)Re-arrange labor in manual auxiliary production to reduce labours; (iii) Recalculate the direct labor productivity assigned to the 11th long wall. With these solutions, the company will increase the initiative in production, improve labor productivity and lower product costs.

The trend of transforming the organizational model of training activities by taking advantage of the information technology has brought practical effects to educational institutions. The combination of traditional classroom instruction and digital environments creates a personalized, more effective, and better-resulted learning experience. The paper focuses on researching the concept of blended learning (Blended learning); learning models of Blended learning and the ability to apply Blended learning models in teaching economics at the Hanoi University of Mining and Geology.

Customer segmentation is the process of dividing customers based on common characteristics such as their behavior, buying habits and service usage,... so that companies can market for each group customers more effectively and appropriately. The paper analyzes customer cluster segmentation via the K-Means clustering methods of a business sector. The research was conducted on 272 customers with characteristics of age, income and expense score. The research results are divided into 2 target customer clusters, promising to help care and marketing customers more effectively; Help business units to have appropriate marketing strategies to reduce costs and increase efficiency.

The article uses Dupont analysis to determine the factors affecting profitability (ROE) of Vietnam coal mining enterprises and the regression method to examine the impact of production capacity of short-term assets, production capacity of long-term assets, production capacity of costs and capital structure on the profitability of firms. The article uses financial data collected from 19 coal mining companies of Vietnam National Coal-Mineral Industries Holding Corporation during the period of 2015 - 2018. The results show that production capacity of short-term assets, production capacity of long-term assets, production capacity of costs and capital structure positively impact profitability. The paper suggests 2 ways to improve profitability: firstly, borrowing to invest in technology will help coal mining enterprises improve their profitability; secondly, improving production processes appropriately to take full advantage of existing equipment capacity, thereby increasing profitability.

Currently, VNREDSAT 1 data have been commonly applied in studying disciplines of landscapes or socioeconomy. Nevertheless, there are limited studies using these data in water quality management. This article focuses on estimating amounts of SPM (Suspended Particulate Matters) from VNREDSAT 1 in Thi Vai river basin based on a popular formula with on - site adjustments. Results were validated by field data with an relative value R2 = 0. 79. This value represents that there is a potential of applying VNREDSAT 1 in studying SPM in water depending on certain circumstances of accuracy.

Oi and Gas exploration and production are highly international and strategic in terms of national energy security and sovereignty over the islands. Thus it forces PVEP to always review the structure to not only improve or restructure but also to adapt and develop in the context of international integration. The author has applied the corporate restructuring theory model as the basis of restructuring orientation for PetroVietnam Exploration and Production Corporation (PVEP). Restructuring PVEP is carried out in 5 phases from researching PVEP’s external context, indentifying internal factors of PVEP, implementing restructuring strategies, making options and evaluating result. The application of this theoretical model will help PVEP’s managers to develop a scientific, rigorous, completed and effective restructuring project.

Currently, the number of mining workers quitting their jobs is increasing, while coal mining enterprises are facing many difficulties in labor recruitment. To reach current production requirements and future development, coal enterprises need to retain workers for their operation. In this study, we tested 7 factors affecting the job satisfaction of coal workers, the study showed that 4 factors including relationship, income, job and corporation culture affect positively employee satisfaction while job opportunities and working conditions reduce the level of job satisfaction. The research results may be a suggestion to help coal enterprises to devise appropriate solutions to improve job satisfaction of workers, so that they can ensure the maintenance of human resources for production.

ThingSpeak is an open Internet of Things (IoT) platform with MATLAB® analytics that enables the collection and storage of sensor data in the cloud and development of IoT applications. The ThingSpeak IoT platform provides applications that allow data analysis and visualization in MATLAB. With MATLAB® analysis in ThingSpeak, MATLAB code can be executed to perform preprocessing, visualization, filtering, data analysis, and for object modeling applications. This paper presents researches on Matlab application in Thingspeak Server to build data measurement and analysis system using IoT LoRa Gateway technology. The research contents include suggestions on device configuration for the system, programming the Arduino board and LoRa Shield to collect measurement data from sensor nodes and communicate by LoRa waves to the LoRa Gateway. The LoRa Gateway will send data to Web Server based on Thingspeak's Cloud Service platform using MQTT (Message Queing Telemetry Transport). Thingspeak's Matlab interface will display online and store values from the sensor nodes. The system is integrated and tested on temperature and humidity monitoring model, evaluated for the results with the required accuracy. The research results allow the deployment of IoT Gateway system in practice for online measurement, analysis and data processing applications that require the use of algorithms and code generation in Matlab using Web Server.

Investor sentiment is a sentimental factor, so in existing empirical studies there exist many different methods to measure the depiction of investor sentiment. The methods of designing indicators to measure investor sentiment for the whole stock market, there are no separate studies for investors according to specific industries of the business. Existing empirical studies in other countries show that investor sentiment affects investment activities of enterprises by two ways: The path of The catering theory and the theoretical path Theory of optimism”. The research results are still different. Most scholars argue that the relationship between investor sentiment and firm's investment level is a positive relationship, but some scholars prove that investor sentiment is inversely related to investment activities of the business. Therefore, the article proposes more research directions for the research articles on investment activities of enterprises participating in the stock market of Vietnam.

The article introduces the research results of using Vetiver grass in radioactive environment treatment (water waste, mud waste) in Sin Quyen copper mine area, Lao Cai province. After 30 days, uranium absorption efficiency reached 77.4% and thorium 83.5%, the total alpha and beta activity of the water dramatically declined, alpha treatment efficiency reached 95.3% while beta treatment efficiency reached 93.7%. The model of radioactive pollution treatment by Vetiver showed high efficiency, simple operation. Therefore, it is very promising to apply the treatment of radioactive sludge, radioactive waste sludge in the process of exploiting and processing Sin Quyen copper ore in particular, the areas of radioactive mineral mining in general.

This article will brief through the current practices of collecting and utilizing the environmental protection fees at the localities, point out the results, and highlight the remaining aspects along with their root causes. From there, the article will suggest recommendations in order to emphasize effective management over the collection of the environmental fee in Vietnam.

The article mentioned a problem that has not been paid much attention in fact, but according to the authors, is the urgency and significance in standardizing and improving the quality of textbooks and lectures. and other general university learning materials, that is, the standardization and unification of names and symbols of criteria. Through analysis of typical cases, the article pointed out the inadequacies in the system of criteria in terms of names and symbols; causes; build organizational principles and processes from which to improve.

Impact of the 4th industrial revolution on development of finance and banking system (TCNH) is increasingly clear with the launch of a series of new and innovative banking products and services, as well as introduction of new distribution channels for banking services based on financial technology platform (Fintech). On the basis of components and products of Fintech ecosystem, the article mentioned Fintech market in Vietnam, clarifying positive and negative impacts of Fintech on operations of finance-banking industry, from there to issue some recommendations for activities of Vietnam’s Finance-Banking industry to meet new trends.

Unmanned aerial vehicles (UAV) are widely used for establishing large scale topological maps. Recently, drones have been integrated with high-quality GNSS receivers which allows real time kinematic positioning (RTK), so are called UAV/RTK. This technology is beneficial to surveyors as they do not need to establish many ground control points in mapping such a complex terrain as open-pit mines. DJI Phantom 4 RTK (P4K) is a UAV/RTK which is of much interest due to its small size and low cost. For open-pit mines, the takeoff position of P4K needs to be seriously considered because of its influence on the accuracy of the digital surface model (DSM) and safety of survey flights. This article presents the method of determining the optimal takeoff positions for UAV in large scale mapping for open pit mines. To evaluate this method, a site of steep and rugged terrain with an area of 80 hectares at the Coc Sau coal mine was chosen as the study area. The results indicate that two optimal locations with altitudes of +50 m and +160 m could be used for taking off the P4K. The accuracy of DSM generated from UAV images using the optimal positions satisfied the accuracy requirement of large scale topological maps at the deepest area of the mine (the altitude of -60 m).

As one of the two largest coal production and trading units in Vietnam, Vietnam National Coal - Mineral Industries Holding Corporation Limited (Vinacomin) is still operating both under the planning mechanism and the market mechanism. Additionally, in recent years, the group's coal price is also being built under these mechanisms. In the context of increasingly deep integration, fluctuating coal price and market, the competition of imported coal is getting more and more fierce, while coal mining conditions are increasingly difficult, the coal production and trading still have many shortcomings, so it is necessary to have a coal price determination mechanism accordance with the actual conditions of the Vietnamese coal market. Therefore, in order to determine the coal price scientifically and in association with practice, the reference to the coal pricing mechanism in some countries around the world to draw lessons for Vinacomin plays an important role. The content of this article mentions the coal pricing mechanism in some countries with a large amount of coal mining and consumption such as China, Australia, Russia, Indonesia,... thereby giving a comprehensive view of the coal price management, operation and construction mechanism of some coal markets in the world and as a reference basis for Vinacomin.

Planification is the first function of management process. It has important role to guide and coordinate the other works of enterprise. Coal mining companies in Vinacomin are big ones, operating in the parent companies – subsidiary companies model, so the planification is more important. But these companies have operated from planification mechanism to market mechanism, so planification of them also has some weakness which be effected by habit or experience from old mechanism. Furthermore now Vietnamese Coal Market have had lots changes. The Government is also having the guide to establish and develop Vietnamese Coal Market. So it is essential to innovate planification of coal mining companies in Vinacomin to be suitable with the current context. The paper use some research methods such as theoretical research method; statistical method,… to clarifi necessity of innovating planification of coal mining companies in Vinacomin; establishing theoretical frame work about innovation planification of companies; guiding to innovate planification of coal mining companies in Vinacomin in the current context.

Two different slug test methods including: i) slug test using the standard slug rod and ii) pneumatic slug test are conducted in different well/depth in Danphuong field site for a comparative analysis. These methods are examined at least 3 times for each well to estimate hydraulic conductivities by using Hvorslev. The results show correlation between two slug test methods is very hight with R2 = 0,93. Slug tests methods have several advantages and also disadvantage compare to each other. Practical considerations of performing the tests in real life settings are also considered in the method comparison. The slug-rod method meets 7/10 criterions while pneumatic slug test satisfy 8/10 criterions.

The mechanizetion of Ha Lam coal seam 11 was designed with mining output of 600.000 tous per year. In fact, due to the negative impact of geological conditions as well as the irrationality of the initial production organization, the mining output of the longwall is not reached according to the designed capacity. The paper proposes a method to determine the effective working time of the actual longwall based on each component stage. For specific conditions at coal seam 11 in Ha Lam coal mine. The mean flow rate of the mining stream is considered as a directional factor of the linear function describing the relation between the daily output and the effective mining in the longwall face. This relation is also considered as motivation in particular for supervisory personnel, as it shows advantages resulting from elongation of this time, as well as it shows possible losses of the daily output in a case when the effective working time is given longwall face was shortened.

The Vu Gia - Thu Bon river basin is one of the largest basins in Vietnam. Research and assessment of this potential basin is a great interest to scientists and regulators. One of the important studies is the evaluation of morphological parameters of the basin. The morphological parameters represent water resources and at the same time are one of the factors that help researchers give a comprehensive view of the basin, assessing the factors related to the direction of the flow, the flow rate or hazards throughout the basin. Therefore, this paper is an attempt to evaluate the morphology of Vu Gia - Thu Bon river basin using DEM SRTM (30 m) data in GIS. This analysis can be achieved through the measurement of linear aspects, aerial aspects and relief aspects of the drainage basin. The results of the study show that stream order ranges from first to sixth order with a total stream length of 1024, a total length of 3183.2 km. Basin was divided into three subregions: upland, midland, and lowland. Those represent 66,9%, 26,0% and 7,1% percent of the region’s total area respectively.

One of the advanced methods to evaluate the effects of blasting vibration wave on the constructions in need of protection surrounding limestone quarries is to use measurement equipment, according to Norm QCVN 02:2008/BCT of Ministry of Industry and Trade (Vietnam). It is the first time in Vietnam when the authors employ the blasting monitoring equipment MR3000BLA made of Bartec Syscom (Switzerland). The equipment is integrated with the new 4.0 technology to measure the effects of blasting vibration waves on the constructions in need of protection surrounding and determine the reasonable size of blasting for Phong Xuan limestone quarry in Thua Thien Hue province.

In mining industry, blasting operation is effective method to fragment rocks, supporting for the next operations in surface mines such as loading, and hauling works. However, blasting operation also impacts adversely on buildings and the surrounding environment, in which the vibration wave is one of the most severe impacts. Therefore, the implementation of the forecasting models of vibration speed contributes significantly to guarantee the safety of buildings located within the impact areas of the vibration wave. This paper employs the monitoring results of blasting activity at the Ninh Dan limestone quarry situated in Thanh Ba district, Phu Tho province, to develop different forecasting models that determine the effects of the ground vibration speed in the surrounding buildings. The results show that the models USBM and Ambraseys Hendron having more accuvate prediction than other models.

The soft soil improvement by vertical drains (PVD, sand drains) are widely used in Vietnam. One of the methods is used for designing soft soil improvement by vertical drains is the Equivalent Plane Strain solution. To use this solution, the permeability coefficient of soil is converted into the equivalent permeability under plane strain. The paper presents the application of this solution to design soft soil improvement by sand drains at Km 3+130 Vi Thanh - Can Tho. It indicated that the settlement results of the soft ground treatment design based on Equivalent Plane Strain solution are similar to those from the Axisymmetric Condition analysis and field monitoring.

The paper presents the compressive strength of mortar samples when replacing natural sand by bottom ash of An Khanh and Cao Ngan thermal power plants (TPPs) in Thai Nguyen province. Experimental research is the main method applied in this research. Research results show that replacing natural sand by bottom ash in the two TPPs, the compressive strength of samples reached the required mortar’s strength. The compressive strength of the mortar sample replaced all-natural sand, particularly for masonry mortar and plastering mortar, is 10.9 MPa and 16.4 MPa respectively for An Khánh TTP, and 12.7 MPa and 12.6 MPa for Cao Ngan TTP, while the compressive strength of the motar used all natural sand, reached 13.2 MPa and 8.6 MPa.

The utilization of waste materials in soil improvement is the potential for the reduction of the negative effect on the environment and the construction cost as well. One of the waste materials is rice husk ash (RHA), which is an agricultural-by product and can be utilized for soil improvement. This paper aims to present a comprehensive review of the numerous investigations on rice husk ash and its utilization in soil improvement. Based on the literature review, there are some findings as follows: (i) burning rice husk ash in incinerator under a controlled temperature of 500÷8000C and time of 1÷4 hours will produce RHA with high pozzolanic activity; (ii) the RHA can be considered as a stabilizer for different types of soil, and it can be used in combination with different chemical binders and waste materials for soil improvement; (iii) from the view of engineering purposes, the RHA from about 3 to 20%, the lime from 2 to 9%, the cement from 2 to 15% were mostly suggested to improve the soil for pavement, road (base and sub-base layers), and building houses in rural areas. However, the research on the utilization of RHA in soft ground improvement by deep mixing method using lime and cement is still limited, and it is therefore recommended for further research. In addition, the experimental field research on the utilization of RHA for soil improvement in engineering practice needs to be conducted.

This article presents a technical solution of displacement and deformation monitoring in real-time based on GNSS CORS technology. The components and principles of operation of the monitoring system for displacement and deformation have been designed and established. The continuous operation reference station (CORS) with Net S8+ receiver was used to correct position for monitoring station in the RTCM format. A device for receiving and transmitting data from the monitoring station to the server has been designed and developed. NMEA messages have been decoded and filtered through three steps using our self-developed software which improves the accuracy of the monitoring results. The results of monitoring of displacement and deformation of An Binh high-rise building (in Hanoi) show that the developed equipment system can monitor displacement horizontally to 3 mm and vertical displacement to 5 mm.

The basement of a high-rise building is the optimal space for technical systems and parking. However, the construction in narrow urban areas usually has many unstable hazards. In this study, a numerical model has been established and calibrated using the finite element method on Plaxis 2D software that allowed well control of the design and construction processes of the Madison Building basement. The model covers all structural elements and complex engineering geology conditions. Displacements of the excavation wall and surrounding ground base subsidence were analyzed corresponding to the constructive phases of three basements. The analysis results of the numerical model were consistent with the actual construction process that is useful for design and constructive controlling of the excavation wall.

In this study, the approaches and research methods have been proposed based on the analysis of challenges in modeling, establishing a three-dimensional model of geological engineering conditions of the Hanoi area. The three-dimensional model of the Hanoi area was composed of 21 geological engineering units as a stacked structure, with accuracy and reliability were verified by statistical evaluation. Based on the integration of engineering geological attributes, the model has contributed for reconstruction of the geospatial engineering geological structure of the study area as comprehensive, continuously, and high resolution.

In the world, the coal fines usually are upgraded in flotation columns (Jameson, Pneufloat, Microcell,...). The reflux flotation cell is a novel type of flotation column that uses a system of inclined channels to enhance bubble - liquid segregation in flotation. Additionally, in this type of device, it is used a special froth washing mechanism with pressurized water to ameliorate the quality of cleaned coals. This type of device has a simple structure, high capacity and allows to receive cleaned coals of high quality. This paper presents the test results of coal fines samples -0,3mm from Vang Danh Mine by flotation in a laboratory Reflux flotation cell. In the test works, some process parameters are investigated and optimized: flotation time, pulp density, feed rate, froth height, wash water, and flotation reagents regime.

Tamgiang-Bachma area (about 1600km2) is located in Thuathienhue province, which has many outstanding values comprising geological heritages. The results show that the area has high geodiversity. Within the area, 115 geosites have been established and they can be classified into 8 groups as follows: (1) Paleontology, (2) geomorphology and landscape, (3) paleoenvironment, (4) rocky, (5) stratigraphy, (6) economic geology, (7) structural geology, and (8) geological history. The Geological heritage can initially be divided into 3 categories, including: (a) International (5 geosites), (b) National (41 geosites), and (c) Local (69 geosites). In particular, the Tam Giang-Cau Hai largoon, the sandbars covering outside of largoon and Bach Ma Mountain are considered as unique areas of geo-diversity are highly evaluated as importantce for sience, education and geotourism.