bluuebunny/crossref_metadata_2025 huggingface dataset:
Envelope-Based Grid-Point Approach: Efficient Runtime Complexity for Remote Sensing Coverage Analysis
Authors: Sipps Jonathan , Magruder Lori
Published: April 2023

Modern remote sensing science objectives call for multi-instrument measurement collection under ever-stringent mission requirements. Distributed spacecraft missions (DSMs) answer the demand, with multisatellite mission architectures, capable of short revisit intervals and expansive coverage capacity. Variations in instrument, orbit, and the number of satellites expand the trade space combinatorically, leading to a computationally demanding mission design problem. Evaluating trade space intelligently is prevalent in literature, but the fundamental computational burden rests on figure of merit (FOM) calculation, quantifying architecture performance. The grid-point approach (GPA) and quick search and correction (QSC) methods are used to develop FOMs, but poor efficiency leads to slow evaluation of prospective DSM candidates. In this paper, a novel method is introduced, envelope grid-point approach (EGPA), fulfilling the need for faster DSM FOM calculation. The EGPA runtime is nearly invariant to temporal accuracy and varies by the inverse of grid cell size (GCS) for constant GCS-to-swath ratio, thereby scaling to high temporal and spatial resolution. The new method EGPA is validated with GPA for conical and rectangular fields of view, and then the performance of EGPA is compared against QSC, a modern improvement of GPA. Both are compared for a computationally demanding Walker Delta constellation (80°:6/3/1) over 1 day propagation, demonstrating EGPA utility in quickly determining FOMs for DSM design.
Euclid Spacecraft Sine Vibration Test Prediction Through the Virtual Shaker Testing Technique
Authors: Pederbelli Davide , Nali Pietro , Calvi Adriano
Published: April 2023

In the space industry, the sine vibration test prediction of a spacecraft is approached numerically by exploiting the spacecraft finite element model (FEM). A frequency response analysis is run for this purpose, and the spacecraft is assumed in hard-mounted boundary conditions, thus neglecting the shaker compliance. Consequently, unrepresentative structural predictions may lead to test article under- or overtesting, as well as incorrect FEM mathematical model updating, and affect the proper fulfilment of the launcher frequency requirements. Virtual shaker testing (VST) solves these issues by including the shaker FEM within the computational framework and exploiting a coupled transient analysis inclusive of the vibration control system. In this study, VST is applied as a pioneering predictive tool to study spacecraft–shaker dynamic coupling of the Euclid spacecraft, before mechanical qualification tests. Experimental measurements such as test control accelerations, lateral bending moments, cross talk, and notching were effectively predicted and compared to the classical approach. Compression factor effects were investigated through a sensitivity analysis, and test predictions were strongly influenced by this parameter. VST has been shown to be a valid methodology to faithfully simulate the sinusoidal test and extract data otherwise unavailable.
Scramjet Engine Flowpath That Improves Specific Impulse Using JP-7 Fuel
Authors: Choi Yunseok , Driscoll James F.
Published: April 2023

A flowpath geometry was computed that improves the specific impulse of a dual-mode scramjet engine in a generic X-51 hypersonic vehicle. Six parameters were varied: inlet contraction ratio, the diameters and numbers of fuel injectors, divergence angle of the combustor wall, nozzle flap deflection angle, and flight Mach number. The maximum specific impulse [Formula: see text] was 2296 s in the ram mode and 832 s in the scram mode. A reduced-order model simulates the finite-rate chemistry of JP-7 fuel and the unstart limits. Results show that both combustion efficiency and [Formula: see text] drop to unacceptably low levels when the finite-rate chemical reaction rates are weakened by flame strain-out due to the large air velocities, or when the flame becomes longer than the combustor. Small [Formula: see text] occurs when the following are too small: the inlet contraction ratio, the inlet compression ratio, the number of fuel injectors, and the diameter of fuel injectors. When these parameters are too large, excessive heat release causes unstart. The operating range was identified between these limits. For JP-7 fuel, it was found that the inlet should raise the pressure to above 5 atm. Results are explained by the interactions between reactions, mixing, and flame strain-out.
Uncertainty Quantification of Laminar–Turbulent Transition on Airfoil and Fuselage
Authors: Jung Yong Su , Baeder James
Published: April 2023

The effect of uncertainty in Reynolds-averaged Navier–Stokes (RANS) simulations is determined through the application of uncertainty quantification (UQ). In this study, the sensitivity of aerodynamic coefficients to uncertainty in the freestream turbulence intensity (FSTI) and surface roughness is computed for an airfoil (SC1095) and a rotorcraft fuselage model (Rotor-Body-Interaction-Mod7). A laminar–turbulent transition model has been extended to consider roughness-induced transition by incorporating an existing roughness-induced transition model. The current UQ analysis is based on the Monte Carlo method with the Gaussian distributions of uncertain input parameters. A surrogate model allows for incorporating the results of intensive RANS simulations into the Monte Carlo method. The surrogate model is generated using a cubic interpolation for a single-uncertain parameter or a radial basis function for multiple-uncertain parameters. The stochastic standard deviation is measured using combined FSTI and roughness uncertainties. The standard deviation of each aerodynamic coefficient depends on flow conditions (angle of attack, mean FSTI, and mean roughness) and the transition type (natural or separation-induced). The main source of output uncertainty is identified between the unknown FSTI and roughness under various flow conditions.
Advances in Aircraft System Identification at NASA Langley Research Center
Authors: Morelli Eugene A. , Grauer Jared A.
Published: April 2023

Advances in aircraft system identification at NASA Langley Research Center are discussed. The relevant time period includes the years since the last summary paper of this kind, which was published in the Journal of Aircraft in 2005. Research advances were achieved in flight test experiment design, frequency-domain modeling, real-time autonomous global modeling, rapid simulation development and updating, dynamic modeling in turbulence, flight data corrections, model uncertainty characterization, and aeroelastic modeling using distributed sensing. Possible future developments in the field are identified.
Velocimeter Light-Detection-and-Ranging–Informed Terrain Relative Navigation
Authors: Weaver Adams Davis , Peck Caleb , Majji Manoranjan
Published: April 2023

Velocimeter light-detection-and-ranging (LIDAR)–informed batch and sequential estimation approaches for terrain relative navigation applications are developed in this paper. State-of-the-art velocimeter LIDAR sensors are capable of delivering simultaneous three-dimensional relative position, relative Doppler velocity, and reflectivity measurements for every point in the field of view. The proposed batch estimation algorithm yields accurate and statistically consistent vehicle velocity estimates in unknown (uncooperative) environments. This work presents novel pointwise relative position and Doppler velocity measurement models that can be utilized in the presence of known (cooperative) environments. Rate estimates obtained by the batch estimator are fused with the pointwise measurement models and classical inertial measurement unit formulations in the form of a multiplicative extended Kalman filter. This Doppler LIDAR-based sensor fusion approach yields informative terrain relative navigation solutions suitable for both cooperative and uncooperative environments. Results from extensive emulation robotics testing performed at NASA Johnson Space Center and Texas A&M’s Land, Air, and Space Robotics laboratory are presented to validate the proposed methodologies.
Cooperative Circular Guidance of Multiple Missiles: A Practical Prescribed-Time Consensus Approach
Authors: Tang Jingchuan , Zuo Zongyu
Published: April 2023

This paper develops a new class of distributed cooperative guidance laws under both undirected and directed communication topologies based on the circular guidance and the practical prescribed-time consensus. The circular guidance law is augmented with a bias term to achieve impact time synchronization within a prescribed time. The analytical time-to-go expression under the circular guidance law is utilized to ensure the impact time cooperation accuracy. Not only convergence rate but also acceleration magnitude reduction is guaranteed due to the merits of the practical prescribed-time consensus. Moreover, based on the predicted interception point, the proposed guidance laws are extended to a nonmaneuvering target. Finally, numerical simulations in both two-dimensional and three-dimensional scenarios verify the effectiveness, robustness, and superiority of the proposed guidance laws.
Decentralized Observation Allocation for a Large-Scale Constellation
Authors: Parjan Shreya , Chien Steve A.
Published: April 2023

Increased space sensing enables new measurements of a wide range of Earth science phenomena including volcanism, flooding, wildfires, and weather. Large-scale observation constellations of hundreds of assets have already been deployed (for example, Planet Labs’s Dove satellites), and several constellations of tens of thousands of assets are planned. New challenges exist to rapidly assimilate available data and to optimize measurements by directing spacecraft assets to best observe complex Earth science phenomena. Centralized approaches to managing request allocation in these large constellations are constrained by 1) the need to assign/elect a central node to assign requests to spacecraft and 2) reliance on a single agent communicating with potentially thousands of dependent agents. On the other hand, entirely decentralized approaches to request allocation and observation are prone to oversatisfaction of some requests and undersatisfaction of others due to a lack of communication among agents. In large constellations, an intermediary method is necessary to solve the request allocation problem in a distributed manner. We present distributed artificial intelligence/multiagent methods that leverage existing work on distributed constraint optimization to allocate observations in a satellite constellation. We compare their performance to centralized and highly decentralized approaches using realistic orbits and observation request distributions. Our distributed algorithms can find approximate solutions to the large-scale constellation request allocation problem with low data volume for agent coordination and extend to continuous planning problems with varying request sets and availability of spacecraft agents.
High-Fidelity Aerostructural Optimization with a Geometrically Nonlinear Flutter Constraint
Authors: Gray Alasdair C. , Riso Cristina , Jonsson Eirikur , Martins Joaquim R. R. A. , Cesnik Carlos E. S.
Published: April 2023

When designing aircraft, avoiding dynamic aeroelastic instabilities such as flutter is a key requirement. One way to meet this requirement is to use a multidisciplinary design optimization subject to a flutter constraint. Flutter-constrained design optimizations have used geometrically linear detailed models, which do not accurately predict flutter for very flexible aircraft, or geometrically nonlinear low-order models, which do not accurately trade off cruise range and structural mass. This paper presents a framework for integrating a geometrically nonlinear, subsonic flutter constraint that captures the large in-flight deflections of very flexible aircraft into high-fidelity gradient-based aerostructural optimization. The cruise range and stress constraints are computed accurately with detailed aerostructural analyses, which use a built-up finite element model coupled to Reynolds-averaged Navier–Stokes computational fluid dynamics. The detailed model is condensed to a low-order aeroelastic model to compute the geometrically nonlinear flutter constraint and its adjoint derivatives with computational cost and robustness suitable for optimization. The framework is demonstrated by maximizing the cruise range of a subsonic high-aspect-ratio wing with respect to panel thicknesses, sweep, and span. The impact of the geometrically nonlinear flutter constraint highly depends on the in-flight deformation level. At low deflection levels, sweeping the wing backward is the most effective flutter prevention method, and the flutter constraint has little impact on the achievable cruise range. At high deflection levels, shortening the wing span is necessary to suppress flutter, reducing the achievable cruise range by up to 5.9%. This work is a step toward making multidisciplinary design optimization a practical tool for designing the energy-efficient, very flexible aircraft of the future, which require geometrically nonlinear flutter analyses early in the design cycle to prevent flutter.
Novel Approach to Improve Stability and Convergence of Flowfield Solution Processes: Mode Multigrid
Authors: Wang XuKun , Liu Yilang , Zhang Weiwei
Published: April 2023

In the field of computational fluid dynamics, stability and convergence problems are often encountered when solving the governing equation. This paper studies the effect of the mode multigrid on the stability and convergence of iterative algorithms. By further analyzing the mechanism for accelerating the convergence of mode multigrid, a new adaptive mode multigrid (AMMG) is proposed, and an adaptive selection criterion is formulated for the parameters of dynamic modal decomposition, which can accurately identify and filter out the unstable modes in the flowfield, thus efficiently obtaining the accurate steady solution. In the cases of laminar flow past circular cylinder and turbulent flow past airfoil, the AMMG significantly improves the stability of the iterative algorithm; in the case of transonic flow past airfoil, the AMMG solves the problem of shock wave shaking during the iteration, and the convergence is significantly improved. In summary, the AMMG method significantly enhances the stability and convergence of the iterative algorithm, and can be used as an effective convergence-preserving computation strategy.
Spatio-Temporal Analysis of a Self-Pulsating Gas-Centered Swirl Coaxial Injector with Forced Gas Jet
Authors: Sahoo Santanu Kumar , Gadgil Hrishikesh , Kumar Sudarshan , Kumar K. S. Biju
Published: April 2023

The objective of the present work is to examine the effects of the acoustically forced gas jet on self-pulsating sprays generated from a gas-centered swirl coaxial injector. We conduct the experiments on self-pulsating spray by forcing the gas jet over a range of forcing frequencies and amplitudes. Various image processing techniques, including proper orthogonal decomposition (POD), have been employed to characterize the spray response. Our spatial mapping of dominant frequencies from time-resolved spray width reveals that although both natural and forcing frequencies prevail in the primary breakup region, a modulation frequency (corresponding to the double of the beat frequency) outcompetes the others. The spatial influence of the forcing is also evaluated by measuring liquid mass fluctuations and drop size statistics at various downstream locations. The experiments were extended to investigate the role of various geometrical parameters, such as swirl number, recess, and length of the gas line on the spray response. The influence of the forcing was observed to prevail even in the liquid mass shedding zone with the appearance of all dominant frequencies. This may have important consequences on the thermoacoustic stability of the combustor. In any case, far downstream of the nozzle, the influence of acoustic forcing is not significant to alter the droplet statistics.
Koiter–Newton Based Model Reduction for Large Deflection Analysis of Wing Structures
Authors: Sinha Kautuk , Alijani Farbod , Krüger Wolf R. , De Breuker Roeland
Published: April 2023

Wing structures subjected to large deflections are prone to nonlinear load-deflection behavior. Geometric nonlinearities can arise due to the accompanying large rotations and in-plane deflections that manifest in the form of stiffening effects in the nonlinear static response. To account for these nonlinearities, reduced-order modeling techniques in combination with nonlinear finite element formulations have been previously proposed. However, these methods often have a limited range of validity due to linear eigenmode-based formulations with assumptions of small rotations. In this paper, a large deflection analysis framework based on the Koiter–Newton model reduction technique is presented. It is demonstrated that the reduced model in its basic form is ineffective for large deflection analysis. To resolve this, an incremental updating procedure is used for the reduced-order model that incorporates the necessary nonlinear effects. The model updating enables the computation of nonlinear response for a large range of deflections.
Factors in Condensate Product Particle Size During Aluminized Propellant Combustion
Authors: Liu Mengying , Yu Wenhao , Li Shipeng
Published: April 2023

The addition of aluminum to propellants positively affects their energy density but also causes problems such as two-phase flow loss, nozzle contamination, wake heat radiation, and condensate particle deposition in the combustion chamber. This paper concentrates on the agglomeration process of aluminum particles and factors in condensed product size during aluminized propellant combustion. The condensed products are divided according to the combustion stage into initial condensed products on the burning surface and final condensed products in the gas stream. The differences in combustion behaviors and size distributions between initial and final condensed products are analyzed in detail. Then, the influence of aluminum content and initial aluminum particle size on the size distribution of the condensed products is studied. It is found that both the initial and final condensed products increase with increasing aluminum content and initial aluminum particle size. A modified Jackson model is presented to estimate the particle size of the propellants’ condensed products. The findings in this paper provide methods for reducing the condensate products of aluminized propellants and provide a basis for applying these propellants and improving their formulation.
Measurement and Identification of Supersonic Stationary Crossflow Waves Based on Sublimation Method
Authors: Yuan Jisen , Yu Shenghao , Gao Liangjie , Qian Zhansen
Published: April 2023

Aiming at the crossflow transition problem of supersonic swept wings, an experimental study on the measurement and identification of boundary-layer stationary crossflow waves was carried out at Mach number 2.0. A 65 deg straight-swept-wing model with simple airfoil geometry was designed to capture the crossflow transition phenomenon. The sublimation method for a large-scale cold supersonic wind tunnel was developed to acquire a transition pattern. The stationary crossflow wave identification technology is based on image processing, a vertical and horizontal decomposition method is established, and the quantitative characteristic information (such as the vortex axis spacing and direction) can be identified from high-resolution sublimation images. The experimental results show that the transition position caused by crossflow instability is closed to the leading edge for supersonic wings with large sweep angles at high Reynolds numbers, and the transition position moves upstream with the increase of the unit Reynolds number. The identified vortex axis spacing and direction are basically consistent with the linear stability theory. The stationary disturbance wave information at different Reynolds numbers is compared and analyzed. It is found that the unit Reynolds number plays an important role in the selection and amplification of the unstable stationary modes with different wavelengths in the transition process.
Thermomechanical Real-Time Hybrid Simulation: Conceptual Framework and Control Requirements
Authors: Montoya Herta , Dyke Shirley J. , Silva Christian E. , Maghareh Amin , Park Jaewon , Ziviani Davide
Published: April 2023

Real-time hybrid simulation (RTHS) is an enabling technology that has transformed engineering experimentation and helped researchers expand modeling capabilities. However, breakthroughs are necessary to expand the range of hybrid simulation methods and, thus, enable experiments with loading conditions representing multiple hazards. This paper discusses the development of a new thermomechanical RTHS framework and a systematic approach to determining RTHS control requirements. First, the framework is established using a representative finite element model of a layered structural system subjected to thermal loading. A complete two-layer system model serves as the reference system, and it is then partitioned into a numerical layer and an experimental layer that share interface conditions. Next, a thermal actuator is introduced to impose dynamic thermal loading on the experimental subsystem, serving as a transfer system. Finally, control and performance metrics are defined to evaluate the realization of interface boundary conditions and map this to the RTHS execution. Through an illustrative example considering the influence of temperature on a lunar habitat, we demonstrate how to establish controller requirements for RTHS and demonstrate that this approach can be used to conduct RTHS on structures with thermomechanical loading.
Flows Generated by Electrohydrodynamic Gas Pumps with Different Electrode Orientations
Authors: Mazumder A. K. M. Monayem H. , Lai Feng C.
Published: April 2023

Numerical simulations have been performed to examine the flows inside a square channel produced by a two-stage electrohydrodynamic (EHD) gas pump with two electrode arrangements. The EHD pump has a pair of seven emitting electrodes flush mounted on two parallel walls at each stage. The flush-mounted electrodes produce corona wind similar to a wall jet that is mainly responsible for flow delivery. The pump is operated by a combination of three different voltages (24, 26, and 28 kV) for performance improvement. Because flow visualization is very challenging to implement in experimental study of EHD flows, very few results are available in the literature. As such, this study is specifically aimed at providing additional insight to the flowfield inside the channel through visualization of the numerical results obtained. Also, the overall effectiveness of the EHD gas pump is evaluated by the volume flow rate delivered as well as its power efficiency. It has been found that the power efficiency for the EHD pumps considered is higher than the conventional fans/pumps. Thus, they have a great potential for applications in thermal management. Particularly, they can be more energy efficient when they are operated by uneven applied voltages.
Standards for the Quality of Performance Arabic Language Teachers Compared to Arab and International Experiences in the Application of Total Quality Management Systems in the Educational Process | Maayir Jaudatun Adau Muallimy al Lughah al Arabiyah Muqoronatun Bittajarubi al Arobiyah wal ‘Alamiyah fii Tathbiqi Nizhimi Idarotul Jaudatu as Syaamilah
Authors: Abbas Mohammad Sami , Izzah Nailul
Published: April 2023

The objectives of the study lie in applying the basic principles of quality: Edward Deming, a pioneer in the idea of total quality, developed fourteen points that clarify what is needed to create and develop a culture of quality. These points are called "the essence of quality in education." The researcher used the descriptive analytical approach, which relies on studying the phenomenon as it exists in reality, and is concerned with describing it as an accurate description, and expresses it quantitatively and qualitatively, in addition to that this approach intends to investigate and analyze the manifestations of the phenomenon. The study sample consisted of 250 teachers of the Arabic language through working groups for teachers of the Arabic language in education schools. It is summarized as follows: creating consistency between educational goals and educational policies, adopting the philosophy of total quality in all educational sectors and institutions, reducing the need for inspection and oversight, and focusing on quality standards and their application.
Implementation of The Special Arabic Language Learning Program (PKPBA) for New Student at The Tarbiyah and Teacher Training Faculty UIN Sultan Maulana Hasanuddin Banten | Implementasi Program Khusus Perkuliahan Bahasa Arab (PKPBA) Bagi Mahasiswa Baru Fakultas Tarbiyah dan Keguruan UIN Sultan Maulana Hasnauddin Banten
Authors: Indriana Dina , Maksum Ali
Published: April 2023

The purpose of this study was to determine the implementation of the Special Arabic Language Learning Program at the Tarbiyah and Teacher Training Faculty of UIN SMH Banten. To determine the Arabic language skills of students at the Tarbiyah and Teacher Training Faculty of UIN SMH Banten. In this study, the researcher used a qualitative method design, which is a method that is often referred to as the naturalistic method because the research was carried out in natural conditions. The method, which is based on the philosophy of positivism, is used to examine the condition of a natural object where the researcher is the key instrument, sampling data sources is done purposively. The special Arabic learning program that the researchers will do is to focus on the Arabic language learning model for each department in the FTK environment by taking a sample of one major in one class. The results of the research are that in teaching second language material, you must understand the principles, namely the principle of priority, the principle of correctness and accuracy, the principle of gradation, the principle of emotionality and the principle of understanding the essence and multiplying applications in learning Arabic.
The Effectiveness of E-Learning on Learning Activities and Achievements Arabic Students | Faa’iliyyah At Ta’lim Al Iliktruniy Fii Muwajahah Ansyithoh Wa Injjaazaat Ath Thulaab Lita’lim Al Lughoh Al ‘Arobiyyah
Authors: Azis Noor Ahmad , Syahril Sulthan , Koderi  , Erlina
Published: April 2023

The background of this research is that learning Arabic is a lesson that is full of memorization, so it is likely that boredom will arise, and in learning activities and student achievement is still low. The purpose of this study was to determine the effectiveness of implementing e-learning media on students' Arabic learning activities and achievements at MAN 2 Bandar Lampung. The type of research used is quantitative research with an associative approach, namely research that looks for a causal relationship between one x variable and 2 y variables. The population in this study were students of class X. The sample in this study used the Proportionate Stratified Random Sampling technique. The samples in this study were 84 students. Data collection techniques, observation, questionnaires, tests and documentation. The results of the study show that there is an influence of the application of e-learning media on student learning activities and achievements. Research results show the normality and homogeneity prerequisite tests: the significance value of Asiymp. Sig (2-tailed) for e-learning 0.200 is greater than 0.05, the value of learning activities is 0.066 greater than 0.05 and for learning achievement 0.200 is greater than 0, 05. It is concluded that the data is normally distributed. The results of the homogeneity test of the probability value of distributing the questionnaire before using e-learning is sig. 0.308 which means greater than 0.05 while the distribution of questionnaires after the use of e-learning is 0.434 which means greater than 0.05. And the probability value of the questionnaire before using e-learning for learning activities is sig. 0.926 which means greater than 0.05 while the distribution of questionnaires after using e-learning produces a value of 0.678 which means greater than 0.05.
Mountain weasel Mustela (Gale) altaica Pallas, 1811 in the Russian Far East
Authors:   Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far East Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia, Yudin V.G.
Published: April 2023

A ubiquitously rare species of the Mustelidae family, the mountain weasel Mustela (Gale) altaica Pallas, 1811, is close in size and body shape to the stoat Mustela (Mustela) erminea Linnaeus, 1758 and the Siberian weasel Mustela (Kolonokus) sibirica Pallas, 1811, which causes difficulties in species identification by non-specialists. However, even taking into account possible errors, data on the mountain weasel hunting indicate a sharp decrease in its abundance and distribution in the Russian Far East in the second half of the 20th century. This is mainly due to the destruction of the species’ habitats and competition with the larger Siberian weasel. Due to these facts, it is proposed to restore the mountain weasel in the Red Data Book of Russia with a rarity status category of 1, as an endangered species.
Тhe far eastern leopard cat Prionailurus bengalensis euptilura needs to be in the red data books of Primorsky krai and Russian Federation
Authors:   Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far East Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia, Uphyrkina O.V. , Beklemisheva V.R. , Goncharuk M.S. , Kerley L.Z. , Graphodatsky A.S. , Perelman P.L.
Published: April 2023

The Far Eastern leopard cat, Prionailurus bengalensis euptilura, is currently recognized as one of the four genetically distinct subspecies of the leopard cat, Prionailurus bengalensis. Previously included in the USSR and RSFSR Red Data Books as a rare species with limited distribution, its enlistment in the regional Red Data Book of Primorsky Кrai, the core habitat area of Russian leopard cat population, is now in question. This article provides information on the cat’s current taxonomic status based on karyological analysis of samples collected from the Primorsky Krai territory, recent molecular genetic studies, the available information on current distribution and population size estimates, proposals for further research. Based on a synthesis of all data, this report recommends including the Far Eastern leopard cat in the Red Data Book of Primorsky Krai and the Red Data Book of Russian Federation as a rare subspecies on the northern edge of species distribution.
In memory of Evgenia Mironovna Bulakh (1946-2022)
Authors:   Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far East Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia, Bukharova N.V.
Published: April 2023

On July 25, 2022, Evgenia Mironovna Bulakh, a well-known Far Eastern mycologist, an experienced unique specialist and a wonderful person, passed away at the age of 76. From 1973 until her last days she worked at the Federal Scientific Center for Biodiversity, Far Eastern Branch of the Russian Academy of Sciences. Evgenia Mironovna devoted her whole life to studying the biodiversity of mushrooms in the Far East, to the study of rare species and mycobiota of nature reserves, as well as popularizing mycological knowledge and educating young professionals. All who knew Evgenia Mironovna Bulakh will remember her not only as a highly qualified mycologist, but also as an extremely enthusiastic, energetic and very kind person.
In memory of Alexei Nikolaevich Tyurin (1950-2022)
Authors:   Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far East Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia, Bogatov V.V. , Goncharov A.A. , Prozorova L.A. , Borkin L.Ya. , Abdullin Sh.R. , Bogacheva A.V. , Zharikova E.A. , Kartavtseva I.V. , Pavlenko M .V. , Razzhigaeva N.G. , Surmach R.S. , Chernova E.N. , Shulkin V.M.
Published: April 2023

On September 6, 2022, Aleksey Nikolaevich Tuyrin, the founder and permanent executive secretary of the scientific peer-reviewed journal Biota and Environment of Natural Areas, passed away at the age of 72. During period 1976–2020 he worked at the National Scientific Center of Marine Biology, and then at the Federal Scientific Center of the Far East Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences. Aleksey Nikolaevich devoted his whole life to conservation of the unique nature of Primorsky Krai. All of us, members of the journal’s editorial board, will remember him with gratitude and continue his life’s work.
Fauna of the geometrid moth (Lepidoptera: Geometridae) of Askold Island 150 years later: historical analysis
Authors:   Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far East Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia, Beljaev Evgeniy A.
Published: April 2023

The results of research of the geometrid moth (Lepidoptera: Geometridae) of Askold Island (Peter the Great Gulf, Russian Far East) carried out for the first time after about a 150-year break are presented. A review of the fauna is made on the basis of personal materials and revised literature data. A comparative analysis of the old and new lists revealed a low level of their intersection, which can be explained by the instability of island populations of geometrid moths as a result of episodic sharp increases in the number of sika deer (Cervus nippon Temminck, 1838), leading to significant damage to the vegetation cover of the island. An estimate of the average rate of moth immigration to Askold Island from continental land over 150 years is proposed.
Steppe polecat Mustela (Putorius) eversmanii Lesson, 1827 in the Amur Region
Authors:   Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far East Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia, Yudin Victor G.
Published: April 2023

Steppe polecat, Mustela eversmanii Lesson, 1827 is rare throughout most of its European and Russian range. In the Russian Far East, the distribution of this polecat is limited to the southwest of the Zeya-Bureya Plain. This species is listed in the Red Data Book of the Amur Region as an endangered species. Until the 1970th the steppe polecat was a commercial species and had a high population, which then dropped drastically during the intensive development of virgin and fallow lands. Conservation of the Amur population of the steppe polecat requires a complete ban on hunting for small mustelids in the south of the Amur Region as well as restoration of its natural habitats.
Lichen species in need of protection in Primorsky Krai of the Russian Far East (for the regional Red Data Book update)
Authors:   Pacific Geographical Institute, Far Eastern Branch of the Russian Academy of Sciences, Radio St., 7, Vladivostok, 690041, Russian Federation, Skirina Irina F. , Skirin Feodor V. ,   Pacific Geographical Institute, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok, 690041, Russian Federation, Rodnikova Ilona M. ,   Pacific Geographical Institute, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok, 690041, Russian Federation
Published: April 2023

The list of lichen species in need of protection was revised for the new edition of the Red Data Book of Primorsky Krai. Changes in lichen taxonomy and additions to information on species ecology and distribution were taken into account. The updated list includes 56 lichen species. We justify the need to introduce 6 lichen species into the regional Red Data Book and exclude 16 lichen species. The following species are recommended to be included in the new regional Red Data Book: Scytinium lichenoides, Alectoria sarmentosa, Hypogymnia fujisanensis, Pyxine sibirica, Phaeophyscia pyrrhophora, Umbilicaria deusta. We propose to exclude the following lichens from the regional Red Data Book: Lichenomphalia hudsoniana, Vulpicida viridis, Parmotrema cetratum, Platismatia erosa, Platismatia glauca, Platismatia norvegica, Anzia colpodes, Hypogymnia metaphysodes, Hypogymnia submundata, Lobaria crassior, Lobaria isidiosa, Nephromopsis laureri, Nephromopsis pseudocomplicata, Nephromopsis pallesens, Cetrelia davidiana, Cetrelia nuda.
The principle of limiting factors as applied to the accumulation of metals by algae
Authors:   Pacific Geographical Institute, Far Eastern Branch of the Russian Academy of Sciences, Radio St., 7, Vladivostok, 690041, Russian Federation, Chernova Elena N.
Published: April 2023

Cases and possible reasons for the absence of an evident relationship between the content of metals in the environment and seaweeds are discussed based on the literature and original data. A direct proportional relationship between these parameters comes to light only at elevated environmental metal concentrations.
Dr. Vladimir Ivanovich Golov’s 85th anniversary
Authors:   Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far East Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia, Zharikova Elena A. , Golodnaya Olga M. ,   Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia
Published: April 2023

On March 6, 2022 Vladimir Ivanovich Golov celebrated his 85th anniversary. He is a well-known scientist, Doctor of Biology, a leading specialist in the study of biogeochemistry, agrochemistry and soil fertility in the Russian Far East.
The 5th Symposium of the Benthological Society of Asia: future perspectives and new official name of the Society
Authors:   Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far East Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia, Prozorova Larisa A.
Published: April 2023

A brief history of the Benthological Society of Asia, beginning in 1998 with the Aquatic Entomological Societies in East Asia, is presented. The work of the 5th BSA Symposium and the results of the two latest meetings of the Executive Board of the society are covered. From January 1, 2023 the official name of the BSA became the Asian Society for Hydrobiology. Prof. Y. J. Bae was elected as the 6th President of the society until December 31, 2024. The expected date for the 6th Symposium of Asian Society for Hydrobiology is July 2–5, 2024. Changes in the structure and nominations, the publication of an international journal, the preparation of a new homepage and other measures to renew the society were proposed.
Türkiye'de Çift Kariyer Yolunda Öğrenci Sporcular: Eğitim mi Spor mu İkilemi?
Authors: KOÇAK Funda , YAŞAR SÖNMEZ Begüm , DOĞUSAN Sena Nur
Published: April 2023

Bu çalışmanın amacı Türk sporcuların eğitim kariyeri ve spor kariyeri olmak üzere çift kariyerlerini birlikte sürdürmede nasıl deneyimler yaşadıklarını incelemektir. Araştırma nitel araştırma yaklaşımında, yorumlayıcı paradigmada ve fenomenolojik desende tasarlanmıştır. Çalışma grubu amaçlı örnekleme yöntemlerinden ölçüt örnekleme yöntemine göre seçilmiştir. Araştırmada üniversite öğrenimine devam eden kendi branşında milli ya da en üst ligde yer alan öğrenci sporculardan 5 kadın ve 5 erkek olmak üzere 10 katılımcı yer almıştır. Veriler yarı yapılandırılmış görüşme formu kullanılarak toplanmıştır. Elde edilen verilerin analizinde içerik analizi yöntemi kullanılmıştır. Araştırmada geçerliği sağlamak amacıyla inandırıcılık, aktarılabilirlik, güvenilebilirlik ve doğrulanabilirlik kriterleri temel alınmıştır. Güvenirliğin sağlanabilmesi için, görüşmelerin kayıt altına alınarak, bunların yazıya aktarılması, farklı araştırmacılar tarafından bireysel kodlama yapılması stratejileri kullanılmıştır. Yapılan analizler sonucunda kuramsal çerçeveye uygun olarak üç ana tema oluşturulmuştur. SBKK boyutlarına göre “Öz yeterlik: Başarı ruhumda var”, “Sonuç beklentileri: destek ve engeller”, “Kişisel hedefler: Akademik sporcular” temaları karşımıza çıkmaktadır. Sporcular yasal olarak desteklendiklerinde ve esnek düzenlemeler yapıldığında çift kariyerlerini daha kolay yönettiklerini belirtmişlerdir. Ebeveyn desteği sporcuların çift kariyerleri ile ilgili karar vermelerinde ve çift kariyerde zorluklarla karşılaştıkları zaman sosyal destek sağlamada önemli bir rol oynamaktadır. Sporcular çift kariyerlerinde eğitim kariyerleri yerine spor kariyerlerini öncelikli olarak görürken, aktif sporculuk sonrası kariyerlerinde akademik olarak ilerlemeyi öncelikli hedef olarak görmektedirler. Çalışmada çift kariyer desteğinde, ülkemizdeki uygulamaların ve çift kariyer yapılarının geliştirilmesi gerektiği dikkat çekmiştir.
Character development of preschool children through participation in domestic work: a case study of four boys in rural Slovenia
Authors: Turk Niskač Barbara
Published: April 2023

In Slovenia, the notion of educational work impacting character development dates at least to the pedagogy of the Enlightenment period. By introducing the concept of educational work – ascribing cultural value to children’s participation in work – we can better grasp how preschool children engaging in domestic work learn through active participation, observation and play. This study examines the educational value of work in a contemporary Slovenian rural setting, where children are daily exposed to various work. Considering children’s motivation to participate and learn through social interactions, childrearing practices, and meanings attributed to work in different political, social and economic contexts work can be seen simultaneously as a powerful socializing agent, a potential disciplining instrument and as meaningful activity integral to human existence.
Défis et nuances d’une ethnographie des enfants habitants d’un lixão au Brésil
Authors: UGLIONE Paula
Published: April 2023

Cet article traite des défis auxquels est confronté un psychologue utilisant la méthode ethnographique. Il part d’une enquête de terrain de quinze mois auprès des enfants vivant dans les environs de la décharge (le lixão) de Gramacho, dans la région métropolitaine de Rio de Janeiro, au Brésil. Autorisations, immersions et le silence traverseront les dilemmes vécus par la chercheuse dans son travail de terrain. Cette analyse veut réfléchir aux nuances méthodologiques et éthiques d’une recherche ethnographique avec des enfants et montrer à quel point elles se distinguent de certains principes et théories du champ psychologique.
Gender and playgroups among Moroccan rural Amazigh children
Authors: Rossie Jean-Pierre
Published: April 2023

Amazigh children between two and thirteen years, living in rural regions of the Middle Atlas, High Atlas, and the Anti-Atlas (Morocco), are the subjects of this article. Fieldwork, starting in 1992 and still going on, lies at the basis of the discussion of these children’s play, toy creation, and toy use. The analysed topics are differences between girls and boys about playgroups, playing time and space, the materiality of toys, play related to rituals and feasts, and children’s play and toys in changing communities. Since 2003, the collaboration of an Amazigh Anti-Atlas woman, Khalija Jariaa, became growingly important. Eight photographs illustrate the article.
A view from the ground: using participatory photography with hunter-gatherer children (Peru)
Authors: Morelli Camilla
Published: April 2023

This article explores the use of participatory photography in ethnographic research with hunter-gatherer children. Drawing on my fieldwork in Peruvian Amazonia, I examine on how participatory photography can help researchers of childhood to move beyond the notion of child voice and explore non-verbal realms of knowledge from a child-centred perspective. While acknowledging the drawbacks and limits of child-centred visual methods, I will focus primarily on the advantages of using methodologies that can highly stimulate children’s enthusiasm and participation in the research process, allowing the researchers to move away from an adult-centric research approach.
Explicit-implicit scheme CABARETI–NH for the equations of a weakly compressible fluid dynamics
Authors: Головизнин В.М. , Майоров П.А. , Афанасьев Н.А. , Майоров П.А. , Соловьев А.В.
Published: April 2023

В статье рассматривается явно-неявная балансно-характеристическая схема CABARETI–NH (CABARET Implicit Non-Hydrostatic), основанная на схеме КАБАРЕ, для решения гиперболизированной системы уравнений Навье–Стокса. Неявность вдоль одного пространственного направления позволяет значительно увеличить шаг по времени на вычислительных сетках с большим аспектным отношением ячеек. Для разрешения введенной неявности используется метод гиперболической прогонки. Это позволяет сохранить вычислительную эффективность алгоритма на уровне явных схем. Приводятся результаты валидации модели на лабораторном эксперименте трехмерного гравитационного течения стратифицированной жидкости.

In this paper, an explicit-implicit conservative-characteristic scheme CABARETI–NH (CABARET Implicit Non-Hydrostatic), based on the CABARET scheme, for a hyperbolised system of Navier–Stokes equations is considered. Implicitness along one spatial direction allows the time step on computational grids with a large aspect ratio of cells to be significantly increased. A hyperbolic sweep method is used to resolve the introduced implicit part of the scheme. This keeps the same level of computational efficiency as explicit schemes. The results of model validation on the laboratory experiment of three-dimensional gravitational flow of a stratified fluid are presented.
Charged Chiral Derivatization for Enantioselective Imaging of D-, L-2-Hydroxyglutaric Acid Using Ion Mobility Spectrometry/Mass Spectrometry
Authors: Sugiyama Eiji , Nishiya Yuki , Yamashita Kenji , Hirokawa Ryo , Iinuma Yoshiteru , Nirasawa Takashi , Mizuno Hajime , Hamashima Yoshitaka , Todoroki Kenichiro
Published: April 2023

A newly synthesized charged chiral tag enabled enantioselective imaging of D-, L-2-hydroxyglutaric acid, which are independently associated with the regulation of DNA methylation. The tag-conjugated diastereomers were ionized efficiently through MALDI, separated by ion mobility spectrometry, and further separated from other molecules in mass spectrometry. On-tissue chiral derivatization using the tag facilitated the visualization of different distributions of the two isomers in the mouse testis.
Fatores de risco associados à obesidade e sobrepeso em cães
Authors: Mendes Ana Cristina Ribeiro , Sousa Felipe Gaia de , Oliveira Brenda Caroline Santana , Miranda Gabriela Cristina , Kwong Maria Alice Chan
Published: April 2023

A obesidade e o sobrepeso são de origem multifatoriais, caracterizados pelo acúmulo de tecido adiposo que tangencia os valores de referência para cada espécie, podendo desencadear alterações das funções fisiológicas. Este artigo de revisão descreve as principais causas da obesidade e do sobrepeso em cães, bem como os fatores de risco associados a essas condições. Foi feito levantamento bibliográfico nas bases de dados eletrônicas SciELO, Medline, Web of Science e Lilacs, bem como a busca em livros e em periódicos. Os estudos selecionados abordavam o conceito de obesidade e de sobrepeso, causas e consequências da obesidade e do sobrepeso, diagnóstico, prevenção e tratamento em cães. A literatura mostra que as causas da obesidade e do sobrepeso estão correlacionadas a aspectos individuais, genéticos, ambientais, comportamentais, com influência da relação cão/tutor e do processo de antropomorfização do animal. Há reflexos no manejo alimentar do cão com as novas formas de relações interespecíficas, como o fornecimento de alimentos inadequados em qualidade e quantidade. A obesidade está associada a riscos para a saúde do animal, devido a sua relação com vários distúrbios fisiológicos e complicações metabólicas, levando à redução da qualidade e expectativa de vida do cão obeso.