bluuebunny/crossref_metadata_2025_split huggingface dataset:
Joint analysis of anisotropic power spectrum, bispectrum and trispectrum: application to N-body simulations
Authors: Gualdi Davide , Gil-Marín Héctor , Verde Licia 
Published: July 2021

Abstract
We perform for the first time a joint analysis of the
monopole and quadrupoles for power spectrum, bispectrum and
integrated trispectrum (i-trispectrum) from the redshift space
matter field in N-body simulations. With a full Markov Chain Monte
Carlo exploration of the posterior distribution, we quantify the
constraints on cosmological parameters for an object density of
n
p = 5 × 10-4 (h Mpc-1)3, redshift z = 0.5,
and a covariance corresponding to a survey volume of V
survey = 25 (h
-1Gpc)3, a set up which is representative of
forthcoming galaxy redshift surveys. We demonstrate the
complementarity of the bispectrum and i-trispectrum in constraining
key cosmological parameters. In particular, compared to the
state-of-the-art power spectrum (monopole plus quadrupole) and
bispectrum (monopole) analyses, we find 1D 68% credible regions
smaller by a factor of (72%,78%,72%,47%,46%) for the
parameters (f,σ8,f
nl,α∥,α⊥)
respectively. This work motivates the additional effort necessary to
include the redshift-space anisotropic signal of higher-order
statistics in the analysis and interpretation of ongoing and future
galaxy surveys.
Chempl: a playable package for modeling interstellar chemistry
Authors: Du Fujun 
Published: July 2021

AbstractAstrochemical modeling is needed for understanding the formation and evolution of interstellar molecules, and for extracting physical information from spectroscopic observations of interstellar clouds. The modeling usually involves the handling of a chemical reaction network and solution of a set of coupled nonlinear ordinary differential equations, which is traditionally done using code written in compiled languages such as Fortran or C/C++. While being computationally efficient, there is room for improvement in the ease of use and interactivity for such an approach. In this work we present a new public code named CHEMPL, which emphasizes interactivity in a modern Python environment, while remaining computationally efficient. Common reaction mechanisms and a three-phase formulation of gas-grain chemistry are implemented by default. It is straightforward to run 0D models with CHEMPL, and only a small amount of additional code is needed to construct 1D or higher-dimensional chemical models. We demonstrate its usage with a few astrochemically relevant examples.
Spatio-temporal equalization multi-window algorithm for asynchronous SSVEP-based BCI
Authors: Yang Chen , Yan Xinyi , Wang Yijun , Chen Yonghao , Zhang Hongxin , Gao Xiaorong 
Published: July 2021

Abstract

Objective. Asynchronous brain-computer interfaces (BCIs) show significant advantages in many practical application scenarios. Compared with the rapid development of synchronous BCIs technology, the progress of asynchronous BCI research, in terms of containing multiple targets and training-free detection, is still relatively slow. In order to improve the practicability of the BCI, a spatio-temporal equalization multi-window algorithm (STE-MW) was proposed for asynchronous detection of steady-state visual evoked potential (SSVEP) without the need for acquiring calibration data. Approach. The algorithm used SIE strategy to intercept EEG signals of different lengths through multiple stacked time windows and statistical decisions-making based on Bayesian risk decision-making. Different from the traditional asynchronous algorithms based on the ‘non-control state detection’ methods, this algorithm was based on the ‘statistical inspection-rejection decision’ mode and did not require a separate classification of non-control states, so it can be effectively applied to detections for large-scale candidates. Main results. Online experimental results involving 14 healthy subjects showed that, in the continuously input experiments of 40 targets, the algorithm achieved the average recognition accuracy of

97.2
±
2.6
%

and the average information transfer rate (ITR) of

106.3
±
32.0

bits

mi

n

−

1

. At the same time, the average false alarm rate in the 240 s resting state test was

0.607
±
0.602

mi

n

−
1

. In the free spelling experiments involving patients with severe amyotrophic lateral sclerosis, the subjects achieved an accuracy of 92.7% and an average ITR of 43.65 bits min−1 in two free spelling experiments. Significance. This algorithm can achieve high-performance, high-precision, and asynchronous detection of SSVEP signals with low algorithm complexity and false alarm rate under multi-targets and training-free conditions, which is helpful for the development of asynchronous BCI systems.
Quadratic relations of the deformed W-superalgebra

Wq,tA(M,N)
Authors: Kojima Takeo 
Published: July 2021

Abstract
We find the free field construction of the basic W-current and screening currents for the deformed W-superalgebra

W

q
,
t

A

(

M
,
N

)

associated with Lie superalgebra of type A(M, N). Using this free field construction, we introduce the higher W-currents and obtain a closed set of quadratic relations among them. These relations are independent of the choice of Dynkin diagrams for the Lie superalgebra A(M, N), though the screening currents are not. This allows us to define

W

q
,
t

A

(

M
,
N

)

by generators and relations.
Density and characteristic of bioturbation of Uca spp at Tanjung Tiram mangrove ecosystem in Poka village, District of Ambon Bay
Authors: Siahainenia Laura 
Published: July 2021

AbstractMangrove ecosystem provides high ecological contribution to various biological resources including fiddler crab,Ucaspp in its ecological and economic role in the ecosystem. The study held in September to October 2020 to analyze species composition, density and characteristic of bioturbation (color, substrate structure and the shape). The study was conducted at 3 station using purposive sampling method. The stations are determined based on the characteristic of the fiddler crabs habitats (living status, the vegetation of mangrove, substrate tipes and utilization level). Three species of fiddler crabs are found in the study namelyUca perpelexa, U. lactea, and U. mjoebergi.The highest density is represented byU. perpelexa.The highest density of fiddler crab is found in station 2 with various habitats characteristics. The color of the bioturbation are different in every station considering the substrate structure. Substrate fraction is dominated by sand in various catagories in every station especially on its roughness (rough, medium and soft). Five shapes of bioturbation are found by the study considering the various percentage of total and the various of inhabitant species in every station. The bioturbations are influenced morfologicaly by substrate structure and the existing rooting of the mangrove vegetation.
Energy analysis of heat recovery plants
Authors: Faiziev T A , Muradov I , Ruzikulov G Yu , Ernafasov S 
Published: July 2021

Abstract
This article discusses one of the most typical heat-using processes - the drying process. The selection and assessment of drying units is carried out according to various parameters, however, the clearest idea of the suitability of the dryer for drying material with known properties and its energy characteristics is given by the analysis of the dryer operation, based on the heat technology principles of the design of the technological process under which a characteristic set is taken thermal, hydrodynamic, constructive and other conditions for organizing the technological process of drying materials. Comparison of the energy efficiency of a number of dryers, carried out according to the described technique, taking into account the costs of creating and maintaining the required hydrodynamic conditions in the working chamber of the drying apparatus, referred to the unit volume of the chamber, taking into account the separation of the dried material and cleaning the spent heat carrier.
Increasing the energy efficiency of combined heat power plants by reducing the temperature of the additional feed water of power boilers
Authors: Orlov M E , Abuleyev A D , Lytyakov E S 
Published: July 2021

Abstract
The article discusses a fundamentally new technology for increasing the specific generation of electricity based on thermal consumption, and also calculates the effectiveness of the proposed solution. The main distinguishing feature of this solution is a decrease in the temperature of the additional feed water of the boilers of thermal power plants. As a result, a method was developed to increase the specific power generation based on heat consumption by reducing the temperature of the additional feed water of power boilers. The authors have developed a technical solution for the use of gas entering the burners to cool additional feed water through a heat exchanger-cooler; a study of the economic and energy efficiency of the proposed technical solution has been carried out.
On the correctness of calculating the Fill Factor of the solar module
Authors: Kanareykin Aleksandr Ivanovich 
Published: July 2021

Abstract
The work is devoted to the use of solar energy. The analysis of the problem of choosing solar panels according to their technical characteristics is carried out. It is shown that the key parameters for evaluating the efficiency of solar cells and photovoltaic cells are not so much the efficiency factor, but the fill factor. The article provides a refined formula for calculating the fill factor.
Rational use of energy potential and reduction of the negative impact on the soil of agricultural tractor propellers using instrumental control of slipping
Authors: Ivanov A B , Fedorenko V F , Tarkivsky V E , Petukhov D A 
Published: July 2021

Abstract
The article provides a theoretical analysis of the possibility of using single-frequency GNSS receivers to determine the slipping of agricultural tractors in order to assess the compliance of the weight characteristics of the tractor with the specific conditions of the work performed and more rational use of its energy potential, as well as reduce the negative impact of the propellers on the soil.
Effects of the flotation reagent of potassium butyl xanthate and oil on Lemna minor when present together in an aquatic environment
Authors: Saksonov M N , Ilyin G D , Stom A D , Zhdanova G O , Mataevskaya A V , Tolstoy M Yu 
Published: July 2021

Abstract
The influence of the flotation reagent – potassium butyl xanthate and oil on the aquatic plant duckweed (Lemna minor) was studied. Determined the isolated effect of these compounds in the concentration range of 10.0 – 1000.0 mg / l on the increase in the number of duckweed fronds. Concentrations causing inhibition of test functions by 25%, 50% and 75% relative to control were calculated. A complete two-factor experiment was carried out with the combined action of potassium butyl xanthate and oil. Based on the results of the experiment, a regression equation is presented. The action of the studied compounds is interdependent; the contribution to toxicity under the combined action of potassium butyl xanthate is much higher than that of oil. The nature of the combined toxic effect of these compounds is less than additive.
Influence of operating conditions on the main characteristics of a cobalt Fischer-Tropsch catalyst
Authors: Yakovenko R E , Savost’yanov A P , Chistyakova N S , Bakun V G , Sulima S I 
Published: July 2021

Abstract
Three stages of extraction of the contents of the porous space of cobalt catalysts, continuously operating for different periods of time (Time on stream (TOS) is from 40 to 800 h) in a Fischer-Tropsch fixed bed reactor, were performed to identify carbon-containing compounds using chromatographic analysis. At each stage of extraction, the surface of the samples under study was investigated by SEM and BET methods. It was determined that during operation, as a result of accumulation of linear alkanes in the pores of the catalyst with an average number of carbon atoms from 20 to 25 and a decrease in the specific surface area, the reaction rate reduces by 25-30 %. With the help of oxidative treatment, it was found that elemental carbon is contained in the porous space of the spent catalysts.
Automatic mass meter, increasing the accuracy of calculating the gross weight of oil in vertical steel tanks
Authors: Zemlerub L E , Mashkova A V , Yaroslavkina E E 
Published: July 2021

Abstract
Improving the efficiency of operation of trunk pipelines. However, to assess the activities carried out, accurate and reliable information about the amount of the pumped and stored product is required. Existing methods for measuring the amount of liquid and methods of using capacity measures lead to large errors in calculations. Measurement and tampering with the turnover reporting process depends on the “human factor” and the prerequisites for introducing measurement and tampering into the turnover reporting process. In operation, an automatic system for measuring pressure and temperature by product layers based on the hydrostatic principle of operation, which allows calculating the gross mass of oil. Also, the paper analyzes methods for increasing the accuracy of calibration tables obtained in the process of tank calibration. The proposed system improves the measurement accuracy, productivity and operational efficiency of tank farms.
Dynamics of self-regeneration of the vegetation cover of coal deposits of Republic of Tyva (Russia)
Authors: Sambuu A D , Ajunova O D , Dapyldie A B 
Published: July 2021

Abstract
The article deals with the characteristic feature of the dynamics of self-restoration of vegetation cover on the dumps of the Chadan coal mine of the Republic of Tyva. The initial zonal vegetation is dry-steppe. Currently, there is a high proportion of weed species in the herbage, the presence of trees, willows and a solid carpet of lower plants (green moss), which is not typical for dry steppes. Even after 40 years of restoration of vegetation on coal dumps, the species composition, dominant structure, and ecological groups of plants have not yet been formed. In general, the long-term dynamics of self-restoration of vegetation cover in the area of the coal mine is characterized by some xerophytization of vegetation.
Digital transformation of geo-information support for large gas projects in Arctic
Authors: Abramov V M , Burlov V G , Shevchuk O I , Shilin M B , Chusov A N 
Published: July 2021

Abstract
Article present digital transformation results of geo-information support for large gas projects in Arctic within Industry 4.0 era under climate change and COVID-19. In study, there are used Foresight technologies, theory of decision making under uncertainties, risk management approach, methods of databases constructing in case of digital risk management platforms. Currently, the ways of geo-information support for large arctic gas projects have distinct features of digitalization with new concepts in data obtaining and presenting. In paper, preference is given to the use of digital risk management platforms, which integrate heterogeneous hardware and software resources with the use of web-technologies in distributed networks and wide application of cloud services. There is considered examples of different digital natural risk management platforms for large arctic gas projects. The presented research results have significant scientific noveltyδ can be used in training and educational purposes and can be useful for private investors, public environmental organizations of the civil sector and state environmental control bodies.
The main directions of development of the fuel and energy complex at the regional level
Authors: Ermakova A M 
Published: July 2021

Abstract
The article deals with the current activity of the fuel and energy complex in the Yamalo-Nenets Autonomous District. The most important strategic projects that are planned for implementation in the near future are described. The author identifies certain risks that can affect the effective operation of enterprises, but thanks to the organization of work on the basis of successful cooperation, which is carried out in the region, it is possible to achieve stable economic growth in the coming years.
Digitalization of icebreaker support for fuel-energy resources transportation via Arctic and Subarctic
Authors: Abramov V M , Shevchuk O I , Burlov V G , Shilin M B , Chusov A N 
Published: July 2021

Abstract
Paper describes digitalization development results of icebreaker support for fuel-energy resources transportation via Arctic and Subarctic within Industry 4.0 era under climate change and COVID-19. In study, there are used theory of decision making under uncertainties, risk management approach, Foresight technologies, methods of databases constructing in case of digital risk management platforms. In research, preference is given to the use of geo-information digital online platforms, which integrate heterogeneous hardware and software resources with the use of web-technologies in distributed networks and wide application of cloud services. There is considered examples of chosen platforms using for icebreaker support of fuel-energy resources transportation via Arctic and Subarctic within Industry 4.0 era under climate change and COVID-19. The presented research results have significant scientific novelty and can be useful for state environmental control bodies, commercial organizations and private investors.
Enterprises of the fuel and energy complex - the sphere of high risks and objects of increased industrial danger
Authors: Oznobikhina L A , Pirunova E V 
Published: July 2021

Abstract
Given the rapid development of scientific and technological progress, mankind faced a difficult task - the protection of the most important components of the environment (earth, water, air), subject to severe pollution by man-made waste and emissions, which leads to soil and water oxidation, destruction of the ozone layer of the earth and climatic changes … The industrial policy of the whole world has led to such irreversible and significant changes in the environment that this issue (environmental protection at the enterprise) has become, a global problem of the modern world, is important and urgent. The fuel and energy complex is of great regional importance, it creates the preconditions for the development of fuel-intensive industries and serves as the basis for the formation of industrial complexes, including electric power, petrochemical, coal chemical, and gas industry.
Landscape differentiation of the territory of the Sergachsky district of the Nizhny Novgorod region (Russia)
Authors: Astashin A E , Vatina O E , Pashkin O N , Badin M M , Piyashova S N 
Published: July 2021

Abstract
The territory of the Sergachsky district of the Nizhny Novgorod region is located in the north of the forest-steppe zone, at the northern extremity of the Privolzhskaya Upland. Due to favorable agroclimatic conditions, the researched territory is characterized by a high degree of anthropogenic transformation of landscapes, mainly involved in agriculture. Areas of broad-leaved forests have been preserved mainly in places, that are inconvenient for plowing – on the steep slopes of river valleys and in ravines. Flat watersheds and sloping slopes have been plowing for several centuries. Thus, the landscape features of the territory traditionally determined the type of economic activity and its territorial boundaries, but often land use planning was carried out on an intuitive level, based on the experience of life in the landscape, but not on a systematic account of the specifics of its components. The long-standing and intensive economic pressure has led to a reduction in forest cover, a decrease in biodiversity, the development of erosion processes, and the degradation of soil cover. Further development of the economy in the researched area requires the adoption of well-thought-out decisions, based on the results of geosystem analysis. During solving problems of territorial planning, nature management, implementation of environmental protection measures, the most effective is the use of a landscape approach. However, until the present, the scheme of landscape differentiation of the territory of the Sergachsky district at the hierarchical level of landscapes has not been developed. The article presents the results of landscape zoning of the territory of the Sergachsky district of the Nizhny Novgorod region, performed on the basis of field research, analysis of maps, literature sources and remote sensing data processed using GIS. The presented results are the basis for making management decisions in the researched area.
General and regional landslide study: problems and tasks
Authors: Nikonorova I V , Petrov N F , Gumenyuk A E , Ilyin V N , Vishnevskaya M P 
Published: July 2021

Abstract
Most of the well known problems of landslide study are revised and summarized. Various schemes of the basic signs for the landslide classifications (natural, auxiliary and regional) are illustrated and mentioned. Theoretical problems of the landslide terminology, taxonomy and nomenclature, including their mechanisms, process and structural parts, as well as a general scientific definition of the landslide concepts, are discussed. The report reflects the authors view on the object and subject of landslide study.
Changes in the Structure of Forest Communities in Penza Region under the Influence of Natural Factors
Authors: Volodkin A A , Larionov M V , Sharunov O A 
Published: July 2021

Abstract
This article presents the factors influencing the formation and viability of woody vegetation in the forests of Penza region, located at the border of broad-leaved forests zone (north-eastern part) and forest-steppe (west-ern half and south-eastern part). According to the results of the National Ecological Rating of Regions, Penza region ranked 28th out of 85 Russian regions where environmental pollution is monitored. The total land area of forests is 999.3 thousand hectares, or 23.0% of the total land area of Penza region. Operational forests occupy 413.1 thousand hectares or 45.1% of the total area of land area of forest fund. Protective forests occupy 502,100 ha or 54,9% of total area of lands of forest reserve. Coniferous (pine, spruce), soft-leaved (birch, aspen, linden, alder, willow, poplar) and hardleaved (oak, ash, maple, elm) forest plantations grow on the territory of Penza region. The predominant and main tree species are Pínus sylvestris, Quercus robur, Betula pendula, Populus tremula, Tília cordata and Fraxinus excelsior. Every year, the region’s forests are affected by abiotic, biotic and anthropogenic factors. As a result of these processes there is a weakening of trees and their increased retreat in the plantation. Among the range of negative impacts on the condition of the region forests the first place is occu-pied by forest diseases (68,9% of the total area of all the negative factors), the second place - by weather condi-tions and soil and climatic factors (22,2%), the third - by forest fires (7,7%). In general, the condition of forests in Penza region is satisfactory. The most important task of forestry is to increase the productivity and quality of forests.