bluuebunny/crossref_metadata_2025 huggingface dataset:
Impact of construction activities on the environment of cities
Authors: Vinogradova N , Kravchenko D , Kurochkina V V
Published: December 2021

Methods of reducing damage to the environment during construction, territorial planning, as well as measures for the improvement of territories aimed at its restoration are considered. The environmental problems of a large city and the assessment of the impact of urban planning objects on the environment have been studied in detail. The paper shows the need to revise the traditional principles of the formation of the urban framework. The paper rightly notes that if earlier much attention was paid to the formation of a technogenic framework of the city – a life support system consisting of transport and engineering infrastructures of the city, today the formation of the ecological framework of the city is becoming increasingly important. The high importance of the ecological (water-green) frame of the city as a system is determined by the fact that water bodies and adjacent territories, “green open” spaces can significantly affect the quality and state of the urban environment, and with careful thought-out, the formation of the ecological frame will help to ensure the integrity of the entire natural and technical urban system.
Integrated approach to area development, preservation and protection of natural landscape
Authors: Ovchinnikova Natalia , Aliyeva Natalia , Petrova Irina
Published: December 2021

The process of modernization of spatial planning principles focused on the conservation of resources in solving problems related to the protection of natural areas is impossible without the effective use of natural framework of the area under study through its zoning. Natural framework is formed on the basis of hydrographic system taking into account the conditions of geomorphology and topography of the territory in the form of an integral structure of green spaces. The growing degree of urbanization of urban settlements, increase in industrial and residential areas, and growing level of motorization play a major role in changing the ecology of the city, destruction of the existing natural framework and increasing recreational load on the urban landscape.
Natural and anthropogenic systems as an ecological basis for the formation of an urban landscape
Authors: Gaifutdinova T V , Gaifutdinov A M , Galiev R M , Khusnutdinova R R , Khasanova A R , Kiyamova A G
Published: December 2021

Natural and anthropogenic systems are the result of the transformation of natural systems included in the city boundaries. They form the basis for the formation of the urban landscape and are the centers of action of natural processes. They actively influence the development of urban infrastructure. The city of Naberezhnye Chelny is a large industrial center, the second largest in terms of population (more than 500,000 inhabitants) in the Republic of Tatarstan, which is a part of the Russian Federation. Using this city as an example, the article examines such natural and anthropogenic systems as: river valleys, gully-ravine systems and forest plantations that make up the ecological structure of an urban landscape. They are classified according to the degree of their change as a result of anthropogenic impact. There are revealed peculiarities of their influence on the development of the city’s environment.
Optimization of nature-like resource-saving agrarian methods in the landscape-adaptive systems of agriculture in the postvirgin regions of the Ural and West Siberia
Authors: Gulyanov Yu A , Levykin S V
Published: December 2021

The study aims to assess the adaptability of farming methods realized in zonal soil and climatic conditions within post-virgin land regions of the Ural and West Siberia, their nature-like and resource-saving orientation. The main evaluation criteria were the completeness and uniformity of the formation of the biological mass of field agrocenoses by analyzing the spatial distribution of the normalized difference vegetation index (NDVI). The public satellite images Landsat 8 and Santienel with a spatial resolution of 15-30 m/pixel, posted on online resources OneSoil.ai and Santienel-hub.com., were used as the NDVI data source. The results of the conducted studies have confirmed the high “diversity” and low realization of the biological potential of the cultivated crops with traditional resource-intensive cultivation methods, which have become a consequence of the widespread non-renewable production of soil resources. At the same time, the optimization of nature-like resource-saving agricultural practices and their adaptation to zonal landscape-adaptive farming systems confirmed the status of an effective means of improving the habitat of cultivated plants. According to the results of the analysis of agricultural technologies in model farms, cultivating practices that promote increasing the completeness and uniformity of the formation of biological mass in the conditions of modern climatic and anthropogenic challenges are systematized.
Methodology for assessing the potential of wind energy use in a constituent entity of the Russian Federation
Authors: Fedorovskaya Albina , Sheina Svetlana
Published: December 2021

The article discusses the methodology for assessing the use of wind energy for the territory of the Russian Federation. Used in this case to determine the energy level of the development of the territory of municipal educational institutions. The main factors in the selection and implementation of renewable energy sources in residential construction are natural parameters, that is, the wind region. The basis for the assessment is the climate-forming factors of the territory. The considered system of assessing the territory was tested on the example of the Rostov region in the field of wind energy. Based on the maps built in ArcGIS ESRI, the territory of the Rostov Region is visually represented and its suitability is estimated for the introduction and development of wind energy source.
Giluyskaya Hydropower – new approach to project development
Authors: Sidorenko G I , Demyanova M A
Published: December 2021

Multivariate water-power calculations were carried out and the main parameters of the reservoired Gilyuyskaya HPP were justified. The Gilyuy river is located in the Amur Region of the Far Eastern Federal District and is a right tributary of the Zeya River. The mouth of the Gilyuy river is located above the power site of Zeyskaya HPP. Based on the water-power calculations, it was found that the most efficient way is to use live storage capacity of 3.13 km3 and the turbine flow rate of HPP equal to 268 m3/s. The installed power capacity of Giluyskaya HPP is justified on the basis of maximizing the net present value and is assumed to be 213 MW. Hydropower has three hydraulic units with radial-axial turbine RO115with impeller diameter of 3.35 m and synchronous speed of 214.3rpm.The high-head water power development includes as follows: a concrete gravity dam, a concrete spillway dam with nappe-shaped profile, a concrete power dam with three water inlets and three steel pipelines with a diameter of 4 m, as well as HPP building. The HPP building is 48.68 m long and consists of three hydropower units with a width of 16.23 m. The length of the tent of HPP building along the flowstream is 18.5 m. The assembly area is 24.34 m long.
Design flaws in compact plants for wastewater treatment in food industry enterprises
Authors: Ambrosova Galina , Kruglikova Anastasiia
Published: December 2021

The results of adjustment work, carried out at the local sewage treatment plants of food industry enterprise are presented in this paper. The enterprise has two sites, designed for the treatment of high and medium concentration effluents with a low pH value (3.5-5.5). Concentrated effluents are treated under anaerobic conditions in a compact installation consisting of a waste receiver, an anaerobic bioreactor, centrifuge thickener, centrifuge, flocculant preparation units and reagents. Wastes of medium concentration after neutralization are treated under aerobic conditions. The structure of this compact unit includes first-stage flotators, aerotanks operating for incomplete biological treatment, and second-stage flotators. Foam of the first stage and excess activated sludge of flotation devices of the second stage are dewatered on filter presses without treatment. The essence of the commissioning work consists in a detailed analysis of design solutions for both sites, study of the wastewater composition of high and medium concentration, systematization of operational data, which will allow operation to select the optimal operating mode of the main structures (anaerobic bioreactor and aeration tank). On the basis of the performed work, the optimal technological scheme of the unit for anaerobic digestion of high-concentration effluents has been developed and proposed. It is recommended to abandon the use of reagents, introduced before the flotation devices of the first and the second stages, due to an increase in the working pressure in the saturator for a compact installation designed for the treatment wastewater of medium concentration.
On the issue of the feasibility of using modern technologies for biological phosphorus removal in low-capacity wastewater treatment plants
Authors: Kulik Ivan , Shuckaya Elena
Published: December 2021

The article discusses the basic principles of wastewater treatment from biogenic elements, provides the necessary conditions for the biological removal of phosphorus compounds. The technology of pre-fermentation of the sediment of primary sedimentation tanks, options for its design, the main parameters of the process are described. Specific aspects of the operation of low-capacity wastewater treatment facilities are indicated and the expediency of using the technology of biological phosphorus removal in them is considered.
Comparative analysis of the theory of constrained sedimentation and compression of sediments
Authors: Butko Denis , Shishova Oksana
Published: December 2021

The object of research contains a comparison between the theories made by Kynch and professor E.F. Kurgaev. These theories are based on the fundamental hypothesis about the change in volume concentration during compression (settling). The features of both of them have been clarified to be applied to the study of sediments compression from stations of potable water preparation. The advantage of the theory of professor E.F. Kurgaev considers the term of sediments compression both in short term and long term perspective, meaning up to several years, which is especially important for the calculation of sludge collectors.
Implementation of engineering and geodetic works in the framework of research work, which are aimed at developing proposals for the development of settlements of the municipality
Authors: Germak O , Gugueva O , Kalacheva N
Published: December 2021

At any stage of urban planning activities, it may be necessary to plan the territory. The territory planning project can be created on topographic plans of a scale of 1: 2000. Modern needs for cadastre maintenance, land management, and design of territories require high quality topographic material obtained in almost real time with high image resolution. This problem is effectively solved by aerial photography from unmanned aerial vehicles (UAVs). Airborne laser scanning allows you to survey difficult terrain and large areas. To clarify the position of some terrain objects, a GNSS survey in RTK mode was used. The combined survey method provides the necessary accuracy of surveying the situation and the terrain, the measurement accuracy corresponds to the possibility of creating engineering-topographic plans at a scale of 1: 2000. In the course of the work, engineering digital terrain models and orthophotomaps were formed. Based on the data obtained, a digital topographic plan of 1: 2000 scale was compiled.
Optimization of the territorial planning system based on the formation of integrated information systems with a single geospace
Authors: Burdova D V , Tikhonova K B
Published: December 2021

In order to implement the key priorities of state policy in the area of effective territorial management, it is necessary to develop and implement a set of organizational and legal measures that ensure the sustainable development of the territories of the constituent entities of the Russian Federation, municipalities, including urban settlements and municipal districts, for which the corresponding urban planning documentation is being developed. The methodological and theoretical frameworks of the study were the generalized results of scientific developments in different resources management and in the field of land, as well as information support of this process. For the most complete coverage of the problem, deductive, inductive, analytical, comparative legal and other scientific methods were used. Thus, the main instruments of the management system are the accounting and registration system, the control and supervisory system in the land field of use and protection, as well as the territorial planning system. Their structural components contain a significant amount of information, which, in order to raise the efficiency of the land administration system, must be accumulated and reflected in a single geospace. As a result, it was revealed that contradictions between the current norms of sectoral legislation and the insufficient level of technology development hinder the creation of a well-functioning mechanism for the integration of diverse cadastral and urban planning information.
Creation of a cartographic geoinformation system of the river basin with plotted riverbed quarries
Authors: Shamova Vera , Murin Pavel
Published: December 2021

Information and geoinformation technologies can be widely used on inland waterways and water transport facilities. Solving problems related to monitoring the state of water quality, its changes as a result of anthropogenic impact, forecasting the quality of water resources, analyzing water consumption and wastewater disposal – this is not the whole list of opportunities that open up to the user when creating a cartographic basis for the geoinformation system of a river basin. Mathematical and cartographic modeling of content and conventional signs is the basis of the method for creating electronic maps. Basin maps of large and small rivers represent models of the studied objects and intermediate links between the objects and the researcher. Information about the situation in the river basin is constantly changing. Electronic maps have an indisputable advantage over paper ones in their ability to transmit this information in real time, constantly making any changes that occur in the study area. Various analytical operations can be performed with information that is entered into the GIS and applied to an electronic map of the river basin. The possibilities of GIS technologies in creating a cartographic basis for the river catchment area will affect the ability to transfer the assessment and management system of water resources and water quality to a more modern and high-quality information level, taking into account the real capabilities of the current control system in the field of environmental management.
Practical implementation of the use of GNSS RTK technologies for obtaining topographic and geodetic data
Authors: Gura D , Boltenkova K , Bespyatchuk D , Samarin S , Turk G
Published: December 2021

This paper analyzes the use of GNSS equipment when conducting topographic surveys. It was revealed that despite the presence of a large number of modern and high-precision GNSS receivers, nowadays, the regulatory and legal framework has established significant restrictions on the use of GNSS equipment when carrying out topographic and geodetic surveys. According to the current legislation, this equipment cannot accurately determine coordinates and heights on the ground. To prove the opposite, a scientific experiment was carried out, as a result of which it was found that modern GNSS receivers can more accurately determine coordinates and heights on the ground than modern total stations and electronic theodolites. Therefore, it is recommended to use the obtained data of the experiment as a basis for making changes to the regulatory framework.
Determination of soil scores for the purpose of further calculating the cadastral value of agricultural land
Authors: Zaitseva Ya , Radchevsky N
Published: December 2021

The paper discusses the most important property of the land – soil fertility, which characterizes it as a productive force and the main means of production, as well as a price-forming factor. This ability is the main specific feature of agricultural land. Fertility is understood as the ability of the soil to provide a crop, the level of which depends on the objective properties of the soil itself, climatic conditions and farming culture. This property is the result of soil-forming natural processes, and when used in agriculture, it is also the result of cultivation. It has a huge impact on the value of an agricultural land plot as an object of valuation.
Influence of culture medium composition on the micropropagation of Thymus tauricus Klokov et Des.-Shost.
Authors: Tevfik A , Yegorova N
Published: December 2021

Thymus tauricus Klokov et Des.-Shost. is a perennial dwarf shrub of the Lamiaceae family. This plant has anti-inflammatory, antispasmodic, analgesic and antiseptic properties. The use of biotechnological methods makes it possible to increase the efficiency of traditional methods of breeding and seed production. Our investigation aimed to study the influence of the culture medium composition on the explants morphogenesis at 1-2th stages of Thymus tauricus clonal micropropagation. When comparing three cytokinins, the best explants development was revealed on culture media containing kinetin. Both high vitrification rate of microshoots (31.2-90.2%) and formation of small shoots were observed on media supplemented with BAP or TDZ. The most effective culture medium at the introduction stage is MS with 1.0 mg/l kinetin and 1.0 mg/l GA3 or 1.0 mg/l kinetin. On this medium, on average, 8.4-10.1 microshoots per explant and shoots length of 1.9 cm were obtained. It was found that the optimal culture medium at the actually propagation stage is MS with 1.0 mg/l Kin or 1.0 mg/l kinetin and 0.5 mg/l IAA, on which the multiplication index 26.9-28.5 were obtained. Induction of rhizogenesis with a frequency of 30.2-94.4% and a root length of 1.6-3.0 cm was noted on culture media for the second stage of clonal micropropagation. The results of the studies are the basis for development T. tauricus clonal micropropagation method.
Analysis of X-ray luminescent separation of diamond ores as an automation object
Authors: Podkamenniy Y A , Bebikhov Y V , Semenov A S
Published: December 2021

The paper discusses the basic principles of X-ray luminescent separation of diamond ores as an automation object and analyzes modern technical solutions and basic organizational and technical issues, the solution to which will contribute to the effective implementation of automated control systems in separation. The complex automation systems of processing plants (ore mills) are described. The process and principle of operation of the X-ray luminescent separator of diamond ores are described. It is expedient to automate the X-ray luminescent separation using an automated control system. The issues of designing an automated control system with a human-machine interface are considered. An APCS system and an interface of the automated operator-technologist workstation, upgraded through implementing RSLogix 5000 and FactoryTalk View production management software are described.
Optimization of in vitro rooting and ex vitro adaptation conditions of Melissa officinalis L. microshoots during clonal micropropagation
Authors: Yakimova O V , Yegorova N A
Published: December 2021

Melissa officinalis L. is a perennial herbaceous essential and medicinal plant widely used in pharmacology, perfumery and cosmetics, as well as in alcoholic beverage and food industries. The low content of essential oil in lemon balm raw material determines the selection work aimed at creating high-oil cultivars. The use of clonal micropropagation method in vitro will increase the efficiency of this process and accelerate promising breeding samples multiplication. The aim of our research was to study the influence of cultivation conditions and cultivar on the M. officinalis in vitro rhizogenesis and ex vitro adaptation. It was found that the maximum frequency of shoot rooting (up to 93.3%) in cultivars ‘Citronella’ and ‘Sobornaya’ was on MS culture medium supplemented with 0.5 mg/l NAA. The number of roots was 10.1 and 13.6 pcs. per shoot, respectively. The highest rates of root formation for the cv. ‘Crimchanka’ was found on a culture medium supplemented with 1.0 mg/l IAA (8.7 roots per shoot). The mixture of peat, sand and perlite (2:1:2) as a substrate provided up to 93% of adapted ex vitro lemon balm microplants. The presented studies were used to develop a technique for clonal micropropagation of M. officinalis.
Calculation of northern hemisphere sea ice area using recurrent neural networks
Authors: Viatkin D , Zhuro D , Zakharov M , Malysheva S
Published: December 2021

Ice covering water surfaces causes difficulties for ship traffic in the northern regions. Developing a sustainable logistics system that describes and manages ship traffic requires consideration of many factors, one of which is the area of sea ice covering the waterways. Most of the volume of sea ice in the northern hemisphere is concentrated in the Arctic zone. The paper describes the process and results of data preparation and development of a recurrent neural network to determine the value of ice area change in the next 50 days relative to the last day of sea ice area measurement. The prediction is made based on the previous 30 measured values of sea ice area and a user-specified value of the day for which the prediction will be made. The work uses NSIDC open dataset on sea ice area for the northern hemisphere. This model allows us to calculate the change of sea ice area for 1 day ahead with an accuracy of 0.581%. For the 50-day prediction of ice area, the accuracy is 4.017%.
Modern sedimentation processes in glacial lakes on the Spitsbergen archipelago (on the example of Lake Bretjørna)
Authors: Meshcheriakov N I , Ilyin G V , Zhuvikina E G , Tarasov G V
Published: December 2021

The paper reviews the study results of sedimentation and formation of geochemical characteristics of glacial Lake Bretjørna sediment – as the example of postglacial process in inner areas of Arctic archipelagos. Field research and sampling were carried out in the winter of 2018. The properties of sediments along the profile of the lake were analyzed. The income and accumulation of heavy metals in sediment were assessed. The lithofacies characteristics of the sediments and their spatial distribution were determined. In the paper the main geochemical characteristics of the lake bottom sediments (granulometric composition, organic matter content, as well as the accumulation of Pb, Zn, Cu, Ni, Fe, Mn, Hg) are considered. The correlation between the lithological composition of sediments and their micro-component content are shown. Correlation between elements and terrigenous sediments income from Northern Scandinavia and the Kola Peninsula accumulated by the glacier and snow cover of the catchment is obtained. Three associations of trace elements in the group of studied elements are distinguished.
Optimization Study of Adsorption Parameter for Removal of Dye Pollutant Using Candle Soot Coated Egg Carton
Authors: Tai Yong Kee , Sim Lan Ching , Leong Kah Hon , Saravanan Pichiah
Published: December 2021

In this study, several parameters that affect the adsorption capacity of Rhodamine B (RhB) dyes were reviewed which include initial pH, temperature, contact time and initial dye concentration. Experimental data was extracted from other literatures as input for subsequent optimization study. Design Expert version 11.1.2.0 software was used to find the optimal condition for adsorption of RhB dyes from wastewater by using candle soot coated on egg carton (CS-Egg) as absorbent. The Central Composite Design (CCD) in response surface methodology (RSM) was employed to perform the optimization and analysis process as it was effective in determining the optimal condition for the adsorption process. CCD evaluated many parameters at the same time and thus reducing the number of experiments required. The optimum condition to maximize the adsorption efficiency was obtained at pH 7, 262.5 mg/L, 60 min of contact time and 55 °C. The highest predicted adsorption efficiency of RhB dye was 90 % at optimum condition. The optimization of parameter provides a better understanding on the adsorption efficiency before conducting the actual experimental work.
Numerical Modelling of a Photovoltaic Thermal (PV/T) System Using Nanofluid With Parallel Flow Thermal Absorber
Authors: Kubenthiran J. , Baljit S. , Tijani A. S. , Baharin Z. A. K. , Remeli M.F. , Ong K. S.
Published: December 2021

In the present study, a numerical model of photovoltaic thermal (PV/T) system using alumina (Al2O3) nanofluid, and pure water are used as working fluid. The proposed PV/T model consists of parallel riser tubes that are connected to two header tubes and it is attached to an absorber plate to simulate the conduction and convection heat transfer mechanism of a conventional PV/T system. The energy efficiency of the PV/T model is analyzed by varying the solar radiation (Heat Flux), inlet fluid velocity, and the volume percentage of the nanofluids. The numerical simulation is performed by using a conjugate heat transfer method with a computational fluid dynamics (CFD) software. According to the simulation data, the energy efficiency and the heat transfer coefficient of the PV/T system increased by increasing the inlet fluid velocity. In comparison with water, alumina nanofluid showed better thermal and electrical efficiency due to its high thermal conductivity. The thermal efficiency increased by 5.55% for alumina, compared to pure water and the electrical efficiency increased by 0.15% for alumina. Moreover, the effect of inlet fluid velocity ranging from 0.04m/s to 0.2m/s was also evaluated, and the results showed that the increase in thermal efficiency for pure water and alumina are 18.15% and 25.77%, respectively. Subsequently, the electrical efficiency increased by 0.52% and 0.56% for pure water and alumina using the new parallel flow thermal absorber, respectively.
Design and development of an automated robot for collecting latex cups in rubber plantation
Authors: Kang S. J. , Wong C.S. , Lim C.H. , Tan Y. C.
Published: December 2021

The main reason for robots in agriculture are saving the time and energy required for performing repetitive tasks and increasing the productivity. The turnover rate in rubber plantation is high and youngster nowadays refuse to work in this industrial. This project aims to build a small-scaled automated robot prototype for collecting latex cups in hopes to reduce the dependency of labor in collecting latex. It was fabricated by using 3D printer and consists of transmission system, linear actuator robotic arm and a storage tank. It was analyzed through static test and balance test for mechanical stability. The robot developed can perform auto-navigation with proper calibration on the transmission at flat terrain, and able to control the 3 Degree of Freedom (DoF) robotic arm on the prototype to grab the latex cup smoothly. Ultrasonic sensors are used to locate the rubber trees and movements of the prototype. The robotic arm and the base are controlled by an Arduino Uno and motor driver circuit respectively. A magnetometer was implemented to ensure the prototype could move straight throughout the process. During test, the prototype was placed in front of two “rubber trees” (imitated by water bottle) to let it retrieves the model latex cups and extract the liquid inside. The results showed that implementation of magnetometer enabled the robot much more consistent in the moving direction and proper delay time used for the navigation of the robot. The prototype is able to automate basic tasks and act as fundamental design for future development.
Total Phosphorus and Reactive Phosphate Removal from Aquaculture Wastewater using Calcined Eggshell
Authors: Tan Sin-Ying , Sethupathi Sumathi a/p , Leong Kah-Hon , Ahmad Tanveer
Published: December 2021

Phosphorus is the key nutrient in fish feed, and it has been one of the major soluble nutrients found in aquaculture wastewater (AW). This work aims to evaluate the removal of Total Phosphorus (TP) and Reactive Phosphate (PO4
3-) via adsorption in batch studies using thermally calcined eggshell as adsorbent. The effect of calcination temperature (700 – 1000°C), particle size and holding time were investigated. The screening phase showed that calcined eggshell at 800 °C for 30 minutes was the most suitable condition. Characterization of adsorbents revealed that crystalline structure and functional groups were responsible for the TP and PO4
3- removal using calcined eggshell from AW. Adsorption equilibrium was attained after 15 min with the dosage of 0.2 g of the optimized adsorbent, capable of removing more than 97 % of TP and PO4
3- from AW. This finding has proven the ability of calcined eggshell waste as a potential phosphorus adsorbent from liquid effluents.
Generation Mechanism of Tidally-driven Whirlpools at A Narrow Strait in An Estuary
Authors: Uchiyama Yusuke , Zhang Xu , Yanase Shota
Published: December 2021

This study investigates the generation mechanism and influence of the whirlpools in the Naruto Strait on the surrounding marine environment using state-of-the-art high-resolution numerical ocean circulation modeling in a quadruple nested configuration. The Naruto whirlpools is recognized as an extraordinary seascape that the local governments and the citizens seek to register as a world natural heritage site. We found that the pronounced pressure gradient force associated with the meridional surface elevation difference was induced by a phase difference of two bifurcating major tidal waves. These waves originate from the Kitan Strait, and ultimately produce intense tidal currents at the Naruto Strait. One branch of the tidal waves propagates counter-clockwise along Awaji Island through the Akashi Strait, while the other occurs directly from the Kii Channel. As such, the whirlpool emerges as a large number of sub-mesoscale eddies, primarily due to the horizontal shear instability of tidal currents energized at the narrow topography between two headlands that extend into the strait. A dipole of overturning vertical circulations appears underneath the whirlpools with convergent downward transport at the strongest tidal current near the center of the strait; this causes efficient vertical mixing. This three-dimensional non-linear mixing promotes a time-averaged southeastward mass transport that extracts water and materials from the Harima-nada Sea into the Kii Channel.
Integrated Engineering, Environmental, and Economical Modelling of Micro Hydro Plant (MHP) Production
Authors: Al Dianty Marelianda , Fathurahman Reza , Putuhena Frederik Joseph , Arbaningrum Rizka , Helwani Zuchra
Published: December 2021

The use of renewable energy has commonly concentrated on energy production through wind engines and solar panels. Nowadays, the micro-hydropower (MHP) plant has a great challenge as an important contributor to energy systems. Indonesia has the potential natural resources to develop that power plant, in the form of the river where is abundant throughout all provinces. The research aims to address solving issues regarding deficit energy by renewable energy production. The environmental and hydrological approaches were used to determine the location to obtain the optimal and proper utilization of MHP. The analysing from all modelling creates an economical assessment of MHP energy production. The result recommends MHP with the capacity of 2 x 4.0 MW and a total discharge of 14.30 m3/second whereas design flood discharge is 813.47 m3/second (Q100 year). The implementation of MHP is an effort to achieve independent energy in the region.
Application of an Entropic Method Coupled with STIV for Discharge Measurement in Actual Rivers
Authors: Omori Yoshiro , Fujita Ichiro , Watanabe Ken
Published: December 2021

In recent years, due to the frequent occurrence of floods that exceed the facility maintenance level due to climate change, non-contact flood flow measurement techniques have been paid attention and actually some measurements have been conducted by applying them instead of the conventional float method. The space-time image velocimetry (STIV) which can measure the surface flow velocity distribution from video images is one of such techniques. In order to calculate the river flow from the surface velocity distribution, it is necessary to determine an appropriate surface velocity coefficient, which is the ratio of the average depth velocity to the surface velocity. However, at present, empirical default value has been still used in practice. In this study, the cross-sectional velocity distribution was calculated using an entropic method by utilizing the surface velocity distribution measured by STIV and compared with Acoustic Doppler Current Profiler (ADCP) observation. It was confirmed that the introduction of the velocity dip system express the flow velocity distribution in the vertical direction, where the velocity dip occurs due to the influence of vegetation.
Investigation of the Configuration of Small Hydropower using a Novel Smoothed Particle Hydrodynamics Method
Authors: Ng Shu Kai , Nakayama Akihiko
Published: December 2021

A novel Computational Fluid Dynamics (CFD) method utilizing Smoothed Particle Hydrodynamics (SPH) has been developed and applied to a simulation of flows in small hydropower systems. The simulation of the flow through a gravitational vortex turbine (GVT) small hydropower system where the flow is directed to a circular basin with a vertical-axis turbine, harnessing the rotational energy of the vortex formed to drive the turbine. Two modes of Fluid-Structure Interactions (FSI) were tested with identical flow conditions to evaluate the potential of this method to simulate complex FSI scenarios. It was found that simulation results for both one-way and two-way interactions produced reasonable results. The two-way interaction result proved to reflect more accurate FSI scenarios, but more studies are needed to provide validation.
Building-Information-Modelling-Based Thermal-Energy Performance Evaluation of Silica-Aerogel-Incorporated Rigid Board Roof Insulation Material for Residential Buildings in the Tropical Climate of Malaysia
Authors: Husna Nadzhratul , Farhan Syed Ahmad , Wahab Mohamed Mubarak Abdul , Shafiq Nasir , Sharif Muhammad Taufiq , Razak Siti Nooriza Abd , Ismail Fouad Ismail
Published: December 2021

Malaysia is located in the equator, with a hot and humid climate. The highest temperature recorded during the day was 39 °C, which leads to discomfort among building occupants, in particular, residential buildings, where indoor thermal comfort is of a higher priority compared to other types of buildings. Hence, the thermal performance of the residential roof assembly needs to be improved to lower the indoor temperature and, accordingly, maintain the level of indoor thermal comfort. In view of the need to improve the thermal performance, a silica-aerogel-incorporated rigid board roof insulation material for residential buildings was developed using kapok fibre, high density polyethylene (HDPE) and silica aerogel. The thermal conductivity of the material was measured. The sample with 4 wt. % and 5 wt. % of silica aerogel content obtained the lowest thermal conductivity of 0.04 W/mK. Silica aerogel content of above 4 wt. % did not result in further reduction of the thermal conductivity. Therefore, it can be concluded that the optimum silica aerogel content for the sample was 4 wt. %. Building-Information-Modelling (BIM)based thermal-energy performance evaluation of the material was performed by generating temperature and cooling load data using Integrated Environmental Solution-Virtual Environment to validate the thermal-energy performance of the material, by installing the material within the roof assembly of a residential BIM. Findings indicate that the material can potentially be employed in the future as a roof insulation material to maintain the level of indoor thermal comfort among residential building occupants.
Thermal-Energy Performance of High-Albedo Roof Tiles and Bulk Rafter Insulation in Residential Roof in the Tropical Climate
Authors: Farhan Syed Ahmad , Shafiq Nasir , Husna Nadzhratul , Zain-Ahmed Azni , Wahab Mohamed Mubarak Abdul , Razak Siti Nooriza Abd , Ismail Fouad Ismail
Published: December 2021

Residential roof assemblies in tropical countries, such as Malaysia, are exposed to intense solar radiation throughout the day all-year round due to the high altitude of the sun path as well as the horizontal orientation and high position of the roof in relation to other components of the building envelope. Residential buildings typically employ a lightweight pitched roof with roof tiles and an attic space above a ceiling board. Diurnal heat transfer into the building through the roof assembly can be minimized by reflecting heat at the roof surface via the application of white paint on high-albedo roof tiles as well as resisting heat via installation of bulk rafter insulation within the roof assembly. However, their adoption will have an influence on the nocturnal heat transfer and, accordingly, the resultant thermal-energy performance. Hence, thermal-energy performances of high-albedo roof tiles and bulk rafter insulation were compared to develop an energy-efficient pitched residential roof assembly that is capable of minimizing diurnal heat transfer into the building with less obstruction of the nocturnal heat transfer in the opposite direction. Evaluation of thermal-energy performance was performed on a Building Information Model, which either adopts, solely, the application of white paint on high-albedo roof tiles, or, in amalgamation with, the installation of bulk rafter insulation within the roof assembly. The simulation projected that the application of white paint on high-albedo roof tiles can generate annual energy savings of 13.14 % and, when adopted in amalgamation with the installation of bulk rafter insulation within the roof assembly, 13.91 %.
Synthesis of MIL-101(Cr) Metal Organic Framework by Green Synthesis for CO2 Gas Adsorption
Authors: Ho Pui San , Chong Kok Chung , Lai Soon Onn , Mah Shee Keat , Lee Sze Shin , Lu Shih-Yuan , Lau Woei Jye , Ooi Boon Seng
Published: December 2021

Global warming issue due to the excessive carbon dioxide gas emission have raised strong interest in capturing or reducing the CO2 from flue gas or atmosphere. Physisorption-based CO2 capture applying the metal organic framework (MOF) provides a promising alternative for capturing CO2 due to the simplicity, low operating cost, and low energy requirement of the adsorption approach combined with the high CO2 adsorption capacity MOF material. In this study, a series of Chromium based MIL MOF with a variety molar ratio of chromium metal to 1,4-Benzene Dicarboxylate (BDC) organic linker were prepared via the solvent-free method (mechanochemical) to develop a clean and efficient way of synthesising MOF samples as promising CO2 adsorbents. The XRD results and FTIR spectra have confirmed the successful fabrication of MIL-101(Cr) MOF using the solvent-free method. The SEM images illustrated fine growth of irregular shaped coarse particles for Cr MOF with equal mole ratio of Cr to BDC. The MIL-101(Cr) samples were also tested on their CO2 adsorption capacity to understand the influence of molar ratio of the starting materials on the CO2 adsorption capacity. It was found that the MIL-101(Cr)1 led to the formation of a product with the highest CO2 uptake capacity of 18.78 mmol/g. In contrast, the EDS analysis result revealed that all the samples synthesised in this work were well incorporated with the Chromium element. It is therefore suggested that the molar ratio of Cr to BDC plays a critical role in determining the CO2 gas adsorption capacity.
A data structures for purpose of the BIM-based Life Cycle Assessment: A review and theoretical background
Authors: Brandtner M , Venkrbec V
Published: December 2021

The article deals with the data structure for the purpose of Life Cycle Assessment (LCA) of buildings using the Building Information Model (BIM). Construction industry produces a significant amount of waste and on the other hand the capacities of landfills are almost filled. It is necessary to deal with the effective use of materials that have already been used and have potential to be reused again. LCA is a method that can be used to demonstrate the suitability of proposed materials, structures or buildings in terms of their whole life cycle and its environmental impact. BIM includes, in addition to geometry, the information part. This data can be used for life cycle inventory (LCI) and then for the assessment itself. The aim of the article is to analyse previous approaches and define which data structure is necessary to be obtained from the BIM model for the LCI purpose of a specific material. The proposed methodology of the data recognition and selection is based on data structure of non-graphical database called SNIM, which was developed for the Czech construction environment. The article is also focused on the theoretical background of the newly developed classification system Construction Classification International (CCI).
The level of detail for 4D BIM modeling
Authors: Nechyporchuk Y , Baskova R
Published: December 2021

4D modeling has been actively developing over the past decade along with the progress of BIM implementation. 4D model can provide enhanced early decisions about the space-temporal criticality of work elements. This models is a collection of graphical and scheduling information about an object. These inputs can have different levels of detail (LOD). In creating and using BIM projects, the LOD of datasets is an important aspect. However, to date there is limited research thoroughly investigating the issue of LOD within 4D models. The article provides an overview of studies related to the level of detail for 4D models, and also describes the impact of LOD on the final 4D model.
Insulation of historic buildings and case study simulation
Authors: Hutkai K , Katunský D
Published: December 2021

The article deals with the historic buildings and their insulation. It is generally known that classical thermal insulation of walls from the outside is not permissible due to the cultural value of historic facades. Compared to external insulation solutions, the implementation of internal insulation is more technically complex and faces several risks. In the article is devoted the chapter which deals with the aim of the application of internal insulation in historic buildings. There are mentioned risks associated with the application of internal insulation, which are related to the thermal-humidity behaviour of the structure. One chapter is devoted to faults that may occur after the application of internal insulation. These disorders have a building-physical character and also affect the hygienic criteria of the building. The larger chapter deals with insulating materials suitable for the purposes of interior insulation of historic buildings. The results of a case study from Dublin and Košice are also presented, where the thermal-humidity behaviour of selected thermal insulation materials was investigated. The results of moisture content and surface temperature before and after application of insulating materials are compared.
Analysis of technical solutions of stacks in high-rise buildings
Authors: Sokol M , Peráčková J
Published: December 2021

Nowadays, due to the maximum use of building lands, high-rise buildings in the cities are coming to the forefront of construction. A high-rise building is a building that, due to its height, requires a different technical, technological and structural design. Due to the increasing floors of buildings, more and more demands are placed on sanitary installations in terms of hygiene and quality of distribution. With the drainage in a high-rise building, the biggest problem arises in the design of stacks, which must be given individual attention. Foul water stacks must be designed in such a way that the overpressure and negative pressure created in them do not cause the extraction of water from traps and thus the spread of unpleasant smell in the building. Fluctuations in the pressure in stacks are influenced by many other factors, such as the method of venting of the stack, the fitting used on the stack, or the transition of the stack to the drain. When dimensioning stacks in addition to the correct design, it is also necessary to use a suitable system, which significantly affects the investment costs. A properly chosen system can save a lot of money that could arise from excessive dimensions, unnecessary fire protection systems, or anchorages. The paper deals with a theoretical analysis of modern technical solutions that positively affect pressure fluctuations in waste water pipes in high-rise buildings.
Opportunities for rehabilitation of facades of historic buildings in Moldova with limestone elements
Authors: Albu D C , Lesan A
Published: December 2021

Most buildings of historical and architectural value located in the Republic of Moldova are built of limestone or brick. The facades are decorated with columns, semi-columns and pilasters, balusters, bas-relief, and consoles. The degradation of historic buildings over time leads to the need for rehabilitation and restoration. Often privately owned buildings are repaired with the application of modern materials without taking into account the original materials, without researching the original elements and materials. Authentic decorative elements are replaced by polyurethane foam elements, which due to their easy installation and relatively low cost, can significantly reduce the financial costs of finishing and decorating facades. The interior walls of the brick are covered with plasterboard. The exterior walls of limestone are plastered with cement-based mortar instead of lime-based mortar. In some cases, the walls were covered with polystyrene. All these replacements reduce the architectural and historical value of the buildings lead to the loss of their authenticity. In order to preserve the value of historic buildings, it is necessary to use local materials. This research examines the possibilities of using limestone both for the rehabilitation of masonry and for the restoration of the decorative elements of buildings built in the XVIII-XX centuries.
IoT and 5G enabled construction detection model
Authors: Begić H
Published: December 2021

The Fourth Industrial Revolution (4IR) introduced positive changes to some industries, while for most construction industries it is still enthusiastically anticipated. The 4IR focusing on the construction industry in literature is known as Construction 4.0. The Construction 4.0 concept is invoked to transform the current ways the construction industry operates while ensuring benefits, such as reduced overall construction projects’ costs and duration, improved quality and work safety, etc. Due to the increasing web usage, it is anticipated that the 4IR technologies will achieve full potentials by the uprising of the fifth generation technology standard for broadband cellular networks (i.e. 5G). One of the most important 4IR technologies is found to be the Internet of Things (IoT). In this perspective, a construction monitoring approach, more precisely a model for construction detection and object spatial/time positioning, is presented in this paper. While still in its initial phase, the model was tested and verified in the laboratory environment for small-scale object detection. It was found that the quality of the model will be significantly improved with the use of the 5G network, while the objects’ pool, as big data required for the model’s deep learning, is highly dependent on the IoT.