bluuebunny/crossref_metadata_2025_split huggingface dataset:
Model of a digital device for assessing the state of xylem in tree trunks
Authors: Kamalova N S , Evsikova N Yu , Krutskikh Yu V 
Published: November 2021

Abstract
For the development of systems for predicting the state of forests and trees, adequate models of the influence of temperature and humidity environment fluctuations on the kinetics of the wood microstructure are needed. Formalized modeling should be based on monitoring data obtained with controlled accuracy in real time. The aim of the work was to substantiate the layout of a device for measuring the potential difference in tree trunks to study their state. For the first time in the article, the recorder layout with the operating principle based on the phenomenon of thermally stimulated polarization of wood has substantiated. In addition, a formalized model has presented for processing the monitoring data of the studied potential difference in the framework of classical thermodynamics, which makes it possible to determine the parameters of the kinetics of the microstructure of wood in tree trunks at fluctuations of external factors. As a result of the research carried out, a model of a digital device for assessing the state of wood of tree trunks was developed. The proposed device for recording the response of the trunk wood on the fluctuations of external factors practically does not violate the unique microstructure of the biocomposite and has a controlled accuracy in real time.
Formation of the timber industry competitiveness
Authors: Tretyakova L , Nebesnaya A , Azarova N 
Published: November 2021

Abstract
The article is devoted to the methodological and instrumental study of the process of forming the competitiveness of the timber industry. The authors substantiated the structural and logical scheme of the competitive development of the logging industry, which includes the directions for generating competitive advantages in the process of industry development. Within the framework of the program-targeted approach, the main directions of the system of measures for the formation of the competitive development of the logging industry were formulated in the form of a draft Program for the Development of the Competitiveness of the Timber Industry, considering the time periods of the Strategy for the Development of the Forestry Complex of the Russian Federation until 2030. The authors have proposed the Passport of the Program for the Development of the Competitiveness of the Timber Industry, which includes a set of Subprograms within the framework of the legal and regulatory framework that regulates the use and reproduction of forests. The tactical goals are clarified, tasks are solved within each subprogram; target objectively controlled indicators of the Program are proposed.
The impact of copper oxide and silver nanoparticles on woody plants obtained by in vitro method
Authors: Fedorova O , Grodetskaya T , Evtushenko N , Evlakov P , Gusev A , Zakharova O 
Published: November 2021

Abstract
The article substantiates the necessity of studying behaviour of copper oxide and silver nanoparticles on forest cultures (downy birch 29-58 (Betula pubescens Ehrh.) and poplar ‘Pyramidal-osokoreviy Kamyshinsky’ (Poplus pyramidalis Roz. x Poplus nigra L.) in in vitro as well as in ‘soil-plant-microbiota’ to ensure stability of forest cultures in forest regeneration. The impact of nanoparticles on shoot regeneration and propagation processes was evaluated by introducing nanoparticles into Woody Plant medium. Differences in the influence of nanoparticles on the life processes of plants depending on their concentration and the stage of clonal micropropagation have been established. The results are demonstrated by a 15-25% reduction in the frequency of infection of poplar and birch explants as well as by an increase in their regenerating potential at the stage of introduction in tissue culture. When the nanoparticle solution is used in the soil substrate, a decrease in the number of diseased plants and an increase in their survival rate of 30% can be observed. The inhibitory effect of silver nanoparticles on some ecological and trophic groups of microorganisms has been established. These results can be used in the application of CuO and Ag nanoparticles in the biotechnology of clonal micropropagation of forest crops.
Improving the efficiency of manipulator-type machines with an improved hydraulic drive
Authors: Chetverikova I , Popikov P , Glushkov S 
Published: November 2021

Abstract
The article considers the possibility of increasing the efficiency of manipulator-type machines when harvesting wood by increasing the productivity, energy efficiency and reliability of the hydraulic equipment used. A combined method of transporting timber from logging sites by road and water transport using equipment with an improved hydraulic drive of the manipulator is proposed. The issue has not been worked through before. Using the example of the Northwestern Federal District, the author considers the development of forest areas located in the upper reaches of small and medium rivers. For the first time, original hydromechanical dampers and energy-saving devices are used in hydraulic drives of manipulators of forest machines to reduce dynamic loads and energy consumption for loading and unloading timber. This increases the efficiency of the use of manipulator-type machines, creating mobility, reducing equipment costs, the time spent waiting for unloading on sites for further rafting or shipment. The development of forest areas in a combined way will reduce capital investments for the construction of transport routes at the border of waterways by at least 3 times. All this will reduce the cost of harvesting in general and eliminate the use of additional loaders.
Stock of standing dead trees in boreal forests of Central Siberia
Authors: Mukhortova L V , Krivobokov L V , Schepaschenko D G , Knorre A A , Sobachkin D S 
Published: November 2021

Abstract
A significant part of carbon assimilated by forest is deposited in tree trunks. Growth and development of tree stands is accompanied by accumulation of standing dead trees (snags) due to natural tree mortality and as a result of the impact of exogenous factors. Carbon accumulated in these dead trunks is excluded from the fast turnover due to low rate of wood decomposition, so that snags can be considered as a pool of organic carbon with a slow rate of its return to the atmosphere. We estimated stock of snags on 54 sample plots, which represent the main types of forest ecosystems in the northern and middle taiga of Central Siberia. In the middle taiga, stock of snags varied from up to 7 m3 ha-1 in Siberian spruce forests to 20-42 m3 ha-1 in Scots pine forests. Larch forests in the northern taiga had the similar stock of snags as larch forests in the middle taiga despite significantly higher growing stock in the later. Snags contributed from 4 to 19% to the total stock of woody biomass in studied forests. This study indicated the significance of snags and can be used to estimate carbon budget of forest ecosystems of the region.
Decoding of forest belts using satellite images
Authors: Koshelev A V , Tkachenko N A , Shatrovskaya M O 
Published: November 2021

Abstract
The paper presents the results of decoding the current condition of protective forest plantations of the Volgograd region and their digital inventory mapping on the basis of remote sensing methods and GIS technologies. We have applied a three-level analysis of the system of forest belts located within an administrative district, a farmstead, and a single forest belt. The laboratory visual interpretation of space images has allowed us to analyze the horizontal projection of the forest belts canopy and crowns, their placement in the canopy, as well as pattern and structure. We have also deciphered the signs of the prevailing patterns of tree species mixing. As a result of the research, we have created digital cartographic models of forest belts, compiled digital standards of elm stands in a given age period, assesse taxation and reclamation features of the current state of plantations. The results obtained can be used to monitor the state of plantings and create a local agroforestry GIS.
Radial growth of Scots pine and Norway spruce stands as an indicator of soil and environmental conditions
Authors: Aparin B , Babikov B , Zolotukhin D , Mingareeva E 
Published: November 2021

Abstract
The study presents an analysis of radial growth of Scots pine and Norway spruce trees growing on drained soils formed on varved clays at the sample sites of the Lisino Experimental Forestry (Lisino). Based on dendrochronological studies in Lisino, it has been found that the radial growth of Scots pine and Norway spruce is a sensitive indicator of changes in the soil water regime, climate, and phytocenotic relationships. On the basis of the character of tree-ring width growth, the growth charts allowed distinguishing zones with close to average growth values, as well as with increased and decreased values of radial growth. The cyclical pattern of tree ring width is well expressed in the successive change of zones. The availability of dendrochronological research materials with precise spatial and temporal reference makes it possible to organize monitoring of radial growth of trees as an indicator of changes in climate and habitat conditions.
Carbon stock in litter of middle taiga forest ecosystems of Central Siberia
Authors: Sergeeva O , Mukhortova L , Krivobokov L 
Published: November 2021

Abstract
Litter plays an important role in the carbon cycle of forest ecosystems incorporating significant amount of carbon as a result of annual partial die-off of the biomass and releasing it during complex multistage processes of organic matter decomposition. The balance of these processes in the forests of permafrost zone significantly shifts towards the accumulation of dead organic matter. That makes the assessment of litter stock in these ecosystems particularly relevant, especially in relation to the predicted consequences of climate change in the study region. On the territory of middle taiga of Central Siberia, 14 sampling plots were established in the various landforms (slopes of different exposition, lowlands and uplands). The carbon stock in litter of the main forest types of the studied area varied from 0.47 to 4.46 kgC/m2. Also, the paper considers composition of litter accumulated in these ecosystems, including the ratio between fresh litterfall, fermented and humified plant residues, and dead roots. Our results demonstrated that fermented plant residues prevailed in the litter composition in most types of studied forest ecosystems due to specificity of hydrothermal regime and quality of litterfall. The results obtained might be applied to refine the carbon budget of Siberian forests.
MODIS-derived fire spatial and temporal distribution during haze season in Southeast Asia using empirical orthogonal function
Authors: Khoir Aulia Nisa’ul , Ooi Maggie Chel Gee , Liew Juneng , Suradi  , Kurniawan Andang , Ni’amillah Azka 
Published: November 2021

Abstract
One of the efforts to control the forest and land fire disasters which affect on the biomass burning haze is fire hotspots monitoring. Biomass burning haze in Southeast Asia (SEA) has become a recurring annual issue. This study aims to determine the spatial and temporal distribution of fire hotspots along SEA, so that it can serve as guidance for efforts to control them. The hotspot data used is derived from NASA’s Fire Information for Resource Management System (FIRMS) MODIS sensors which is collected from 2001-2020. Spatial analysis of the re-gridded data shows the highest burning activities over SEA occurred in Feb-Apr, with >2000 fire events in the Indo-China area and >1000 fire events in Sumatra and Borneo. Empirical Orthogonal Function (EOF) was performed on monthly total hotspot data for 228 months for determining dominant patterns spatially and temporally. Based on the EOF analysis results, the three major modes have achieved a total variance of 71 %. The first mode (EOF1) explains 65 % of the total variance. The second (EOF2) and third (EOF3) modes account for 3.60 % and 2.97 % of the total variance respectively. The first and the third principal component identified high loadings over the Indo-China and Sumatra-Borneo regions respectively. Whereas the second principal component separates the fire areas into China and Indo-China region. Inter-annual pattern is dominant in the EOF1, while the inter-seasonal pattern is dominant in EOF2 and EOF3. ENSO, IOD, and MJO are factors that influence the pattern of the determined principal components. The result of this study provides general understanding on how the fire events varied over the past two decades in SEA.
Review of potential astronomical optical observatory sites in the Philippines
Authors: Dela Cruz Ruby Ann B , Tucio Princess 
Published: November 2021

Abstract
The Philippines is an archipelago of more than 7,600 islands with many geographical features such as mountain ranges, seas, and plains. The country has fairly developed cities that are now experiencing various kinds of pollution at different levels and intensities. Highly developed urban areas are brightly lit and are currently experiencing worsening light pollution. Despite this, the two biggest telescopes in the country are still installed in two observatories right in the country’s capital city where light pollution is at its worst. This paper aims to identify several locations away from light pollution in the islands of Luzon, the biggest island in the Philippines, and the island of Palawan, where optical astronomical observatories may be built. The locations are chosen by studying the comparative light pollution scales in the various locations. The topography of the place and meteorological data such as temperature, humidity, and precipitation are likewise studied and considered as factors. Included in these factors is the fact that both the islands of Luzon and Palawan experience several typhoons every year, while earthquakes occur anywhere in the archipelago. For this reason, the observatories to be built must be designed to withstand Category 5 typhoons and strong magnitude 7 to 8 earthquakes. The results of the study identify the places on the island of Palawan and in northern Luzon which are good dark sites for the establishment of optical astronomy observatories. These locations can be declared as protected and developed as dark-sky sites dedicated to the study of Astronomy.
A statistical analysis of the relationship between Pc4 and Pc5 ULF waves, solar winds and geomagnetic storms for predicting earthquake precursor signatures in low latitude regions
Authors: Syed Zafar S N A , Umar Roslan , Sabri N H , Jusoh M H , Yoshikawa A , Abe S , Uozumi T 
Published: November 2021

AbstractShort-term earthquake forecasting is impossible due to the seismometer’s limited sensitivity in detecting the generation of micro-fractures prior to an earthquake. Therefore, there is a strong desire for a non-seismological approach, and one of the most established methods is geomagnetic disturbance observation. Previous research shows that disturbances in the ground geomagnetic field serves as a potential precursor for earthquake studies. It was discovered that electromagnetic waves (EM) in the Ultra-Low Frequency (ULF) range are a promising tool for studying the seismomagnetic effect of earthquake precursors. This study used a multiple regression approach to analyse the preliminary study on the relationship between Pc4 (6.7-22 mHz) and Pc5 (1.7-6.7 mHz) ULF magnetic pulsations, solar wind parameters and geomagnetic indices for predicting earthquake precursor signatures in low latitude regions. The ground geomagnetic field was collected from Davao station (7.00° N, 125.40° E), in the Philippines, which experiences nearby earthquake events (Magnitude <5.0, depth <100 km and epicentre distance from magnetometer station <100 km). The Pc5 ULF waves show the highest variance with four solar wind parameters, namely SWS, SWP, IMF-Bz, SIE and geomagnetic indices (SYM/H) prior to an earthquake event based on the regression model value of R2= 0.1510. Furthermore, the IMF-Bz, SWS, SWP, SWE, and SYM/H were found to be significantly correlated with Pc5 ULF geomagnetic pulsation. This Pc5 ULF magnetic pulsation behaviour in solar winds and geomagnetic storms establishes the possibility of using Pc5 to predict earthquakes.
Submerging paddy cultivation area due to coastal flooding in Kuala Kedah, Malaysia
Authors: Sah Samera Samsuddin , Maulud Khairul Nizam Abdul , Rahim Nurul A’idah Abd , Karim Othman A. , Sharil Suraya 
Published: November 2021

Abstract
Kuala Kedah is a coastal area where the majority of the community are paddy farmers and fishermen. Almost the entire coastal area is used as a paddy cultivation area. However, this area faces the threat of seawater intrusion into land due to climate change driven sea-level rise. The rising seawater has affected the surrounding area, not only in terms of crop yields but also property and livelihood to the locals. Therefore, this study is designed to detect and analyze the progress of seawater on land at the Kuala Kedah coastal area using a hydrodynamic approach. Mike 21 software was used to simulate the hydrodynamic effects on 2 segments (NA and SA) in this study area by considering two conditions namely Condition 1 (K1) and Condition 2 (K2) which are respectively with and without coastal protection structure. However, this structure was only built along the 2.5 km shoreline in the NA segment and not in the SA segment. The findings show that the coastal protection structure in K2 is effective in reducing 50 % of the impact of sea level rise in year 2100 at NA segment, while only 10 % at SA segment. Therefore, the construction of these structures permanently should be given consideration by local authorities in planning future development to ensure lowland areas are protected from coastal floods.
Effect of freeze-dried biofloc as A Dietary Supplement on Water Quality and Growth Performance of red Tilapia (Hybrid)
Authors: Binalshikh-Abubkr Tarq , Hanafiah Marlia Mohd 
Published: November 2021

Abstract
To investigate the effect of supplementation of dried biofloc produced by freeze-drying method on water quality and growth performance of red hybrid tilapia, two experimental diets (T0 treatment: 0 % biofloc; and T1 treatment: 4 % freeze-dried biofloc) were examined during 57 days of feeding trial. Diet T0 resulted in higher feed intake than T1 treatment (P < 0.05), while no significant differences were found between the two treatments in terms of weight gain, SGR, and FCR (P > 0.05). For water quality parameters, values of temperature, EC, TDS, ammonia and nitrate were significantly higher for T1 treatment (P < 0.05). While dissolved oxygen level was significantly lower for T1 treatment compared to T0 treatment (P < 0.05). Moreover, no significant differences were found for pH and salinity (P > 0.05). However, the two treatments showed water quality parameters levels within the range of standard levels of water quality for tilapia culture. In addition, proximate composition of experimental diets showed significantly higher lipid content for T0 treatment than T1 treatment (P < 0.05). While no significant differences were found between means of treatments for organic matter, protein, fiber, ash and energy contents (P > 0.05). Based on these results, a 4 % supplementation of freeze-dried biofloc can be successively included in formulated diets for red hybrid tilapia without any effects on growth in terms of weight gain, specific growth rate, feed conversion ratio and survival, and can result in acceptable water quality levels for red hybrid tilapia.
Characterization of aquifer system using electrical resistivity tomography (ERT) and induced polarisation (IP) techniques
Authors: Akhtar N , Mislan M S , Syakir M I , Anees M T , Yusuff M S M 
Published: November 2021

Abstract
Groundwater plays a major role as an alternative freshwater resource for irrigation and industrial purposes. This study aimed to characterize the subsurface of aquifer systems in TelukIntan district, Perak, Malaysia using Electrical Resistivity Tomography (ERT) and Induced Polarization (IP) methods. The horizontal profiling (TL1 and TL2) was conducted at length of 400 m. The estimated depth is 150 m below ground level (b.g.l.). An ABEM SAS 4000 Terrameter and ABEM LUND ES464 Imaging System were applied to create a resistivity pseudo-section using polar-dipole configuration. The collected geo-electrical data was interpreted using RESIST software with partial curve matching and computer iteration. ERT and IP survey profile results were validated with in-situ borehole data from borehole 2 (B2). Eleven samples of soil profile were collected at depth from 5.6 m to 61.2 m, with average percentage of sand, silt and clay are 93.77 %, 5.78 % and 0.02 %, respectively. The geology of subsurface settings is the key factor in determining the aquifer system characterized by interlayer sand-silt sequence indicating the saturation zone of aquifer underlain by shale at the bottom. Further study on hydraulics perspective is important to understand the overall capacity of the aquifer.
Microbial fuel cells constructed from the integration of anaerobic and aerobic sanitary landfill site systems
Authors: Abdul Harris N , Abdul Halim A 
Published: November 2021

Abstract
The world’s main source of energy now is fossil fuels but the demand for power is increasing. In addition, the burning of fossil fuels produces harmful greenhouse gases and has a significant impact on the environment. The fuel cell system in this study is based on the aerobic and anaerobic integration system are used in most waste disposal methods in Malaysia. It is a system of electrochemistry results from the oxidation of organic matter that transfers electrons to carbon graphite This research is to study the effectiveness of the method generating electricity from micro-fuel cells produced from leachate wastewater and it is also conducted to identify microbial activity using a double chamber system. The food waste obtain is divided into double chambers which is aerobic and anaerobic. Digital readings using a multimeter are performed for ten to thirteen days continuously to obtain the highest reading results for voltage and electric current. The measurement of the highest reading result on the 11th day recorded a reading as high as 146.8 mV at 2000 mV while the current reached 28 μA at 2000 μA. This study has proven that there is the production of electrical sources from the activity of organisms present in food waste using microbial fuel cell systems. The result show that food waste and cattle manure produce the highest voltage and current. This has provided an opportunity to explore alternative ways of generating electricity according to the environment and conditions of each region.