bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sensitivity analysis of antenna gain loss to the disturbance of control moment gyroscope
Authors: Tan Shiyu , Gao Jingbo , Wang Cong , Shen Yingyong 
Published: May 2023

Abstract
The multi-body dynamic model of the SAR satellite and the Ruze formula are used to investigate the antenna gain loss’s sensitivity to the control moment gyroscope. First, by using the finite element method, the satellite’s dynamic model is created and the modal characteristic is then determined. Then the distribution of input disturbance and CMG diagram is established. And the effect of each CMG disturbance on the antenna gain is studied. The sensitivity parameters of gain loss to disturbance are computed by using the One-at-a-Time (OAT) method. The results show that for CMGs, although they are placed asymmetrically and have the same loading characteristics, their effects on the antenna gain are different and need to be considered separately. The method and ideas proposed in this paper can be used to quantify the influence of various disturbances’ sensitivity and control system design.
Transient study on filling characteristics of LOX dome
Authors: Xu Jiabao , Wu Yan , Zhu Qingcheng , Jin Ping , Wang Jue , Cai Guobiao 
Published: May 2023

Abstract
The 3D flow filling process of LOX (Liquid Oxygen) dome is studied in a liquid oxygen/methane rocket engine. The volume, flow field pressure and velocity distributions of liquid oxygen at different time are determined. The flow property of propellant and the injection characteristic time of liquid oxygen are obtained. The results show that when the LOX dome has not been filled, the LOX flow state is disorder, and flows around the annular wall in the middle dome. The static pressure near the equalizing orifice near the liquid oxygen inlet is high and the velocity is slow. When the LOX filling is completed, the pressure at the outlet of each equalizing orifice is the same. The liquid oxygen flow is in a stable state, and the flow rate decreases. The overall velocity distribution is more uniform. In addition, in the filling process of LOX dome, the time of arrival in each area is different. There are different injection delays in each area on the injection panel, and the time of arrival of liquid oxygen in the opposite area of the inlet section of LOX dome is the latest. This result leads to the inhomogeneity of injection characteristic time and flow rate in thrust chamber.
A multi-segment multi-pulse maneuver control method for micro satellite
Authors: Xu Gen , Zeng Nengwei , Chen Danhe 
Published: May 2023

Abstract
Aiming at the constraint due to micro satellite orbital maneuverability and relative navigation, a multi-segment multi-pulse maneuver control method is proposed for approaching a target satellite. Convert the along-track approaching trajectory into an impulsive control problem with fixed time and fixed distance. With time and distance from origin to destination as the optimization objectives, the time-distance optimal solution set is generated under the delta-v constraint and trajectory constraint. The planning function is obtained by fitting a segmented polynomial to the optimal solution set. In the approach mission, the maneuver time to reach the expected terminal is determined based on the planning function, and the approaching to the terminal is accomplished using fixed-time multi-pulse control. Based on the simulation scenario, a multi-segment maneuvering strategy is obtained according to the optimization result, and the mission simulation is completed using the three-pulse control. The results show that the proposed multi-segment multi-pulse maneuver control method can reliably complete the approach mission under the constraints.
Trajectory tracking control for unmanned helicopter based on RBFNN
Authors: Guo Yueru , Lei Zhongkui , Yang Zhuopeng , Li Yihang , Chen Kuiyu , Xu Yanqing 
Published: May 2023

Abstract
This paper proposes a nonlinear adaptive radial basis function neural network (RBFNN) control method for Unmanned Helicopter. The control objective is to reduce the trajectory tracking error of the unmanned helicopter in the presence of system uncertainty and external disturbances. Based on the backstepping control technique, the controller of the unmanned helicopter are designed in order of position kinematics, position dynamics, attitude kinematics and attitude dynamics, and the block processing is used in the last three steps above.Then, RBFNN is added to compensate the error caused by external interference. Meanwhile, the derivatives of virtual controls are obtained by second-order command filter, and the stability of the system is analyzed by Lyapunov stability theorems. Finally, the simulation results verify the stability and robustness of the control method.
Thermal control system design and analysis for a micro-nano satellite stays on target satellite
Authors: Chen Zhezheng , Yang Haibo , Yu Yongjun , Yang Songlin 
Published: May 2023

Abstract
Aiming at the future satellites on-orbit service requirements, this paper researched the thermal control system for a micro-nano satellite. The micro-nano satellite can be attached on target satellite. The extreme temperature conditions of the micro-nano satellite has been determined by analyzing the complex space heat environment and power consumption, the thermal control system of micro-nano satellite has been designed, the finite element model (FEM) of the satellite is established, and the temperature fields about the extreme temperature conditions are calculated. The simulation results proves the feasibility of the thermal control system.
Comprehensive evaluation of the climatic environment adaptability on the civil typical system in the alpine environment
Authors: Wang Binwen , Zhang Hui , Wu Jingtao , Tian Peiqiang , Tang Yanggang 
Published: May 2023

Abstract
The function and performance of the aviation equipment are greatly affected by the alpine climate conditions. Combine with the test data obtained from the extreme climatic environment test, the fuzzy comprehensive evaluation method can effectively evaluate the adaptability of the civil avionics system on the plateau alpine environment. By analyzing the influencing factors of the alpine environment on the civil avionics system, the evaluation index system was established; and the fuzzy comprehensive evaluation method was used to obtain the adaptability evaluation value of the civil avionics system on the alpine environment. The evaluation results of the climatic environment adaptability can provide technical support for the improvement design of the civil aircraft system.
Surge margin monitoring of one turboshaft engine with inlet distortion
Authors: Yan Siqi , Zhang Yun , Li Benwei , Liu Chenguang 
Published: May 2023

Abstract
In order to explore the engine surge when inlet distortion index and engine surge margin, the relationship between the parameter characteristics of research engine surge, strengthen safety monitoring assessment engine, this paper designed a kind of a certain type of engine bench test surge monitoring system, and unstable flow field of a certain type of vortex axis engine working parameters for monitoring and analysis. In this paper, a plug-plate distortion generator is used to induce a surge engine, and the circumferential static pressure changes of the inlet and outlet of the engine, the axial compressor and the centrifugal compressor under different working conditions are obtained. The changes of circumferential unevenness and mean turbulence, the pressure ratio at working point and the converted air flow rate at working point are analyzed with the increase of the height of the plug-plate under different working conditions. The results show that the distortion index of the working point increases and the surge margin decreases with the increase of the height of the plug-plate at the same rotating speed. When the height of the plug-plate is similar, the higher the speed is, the greater the distortion index of the working point is, and the smaller the surge margin is.
Regulating generation of multiple emulsion through double parallel-crank mechanism
Authors: Wang Meng , Zhu Li , Zhang Chuanwen 
Published: May 2023

Abstract
A method was proposed for preparing multiple emulsions based on a double parallel-crank mechanism. The dispersed phase flows into the glass capillary, and the glass capillary was driven to make a circular motion via connecting the crank structure. Then, the external phase shears the dispersed phase through the double parallel-crank mechanism to prepare water in oil (W/O) droplets, and the process of generation of droplets was simulated by CFD. The effects of rotating speed, capillary diameter, external flow rate, and external viscosity on droplet formation were investigated. The size and generation frequency of the droplets was controlled by the rotational speed. More importantly, Single or multicore droplets were generated by the rotation droplet generator, and the effects of rotational speed on the number of cores and droplet size were investigated. Finally, the multi-component microgels were produced by the pre-crosslinking method. This study provides a rotation droplet generation system that has the ability to generate various droplets, expanding the practicability and versatility of the rotation droplet generator, and providing a new platform for multiple emulsion preparations.
On a road map for technology qualification, innovation and cost reduction in floating offshore wind: learning from Hywind and Norwegian approach
Authors: Ibrion Michaela , Nejad Amir R. 
Published: May 2023

Abstract
The main aim of this paper is to synthetize and to learn from the existing road maps and the Norwegian approach on the floating offshore wind. It targets to identify main priorities, key challenges, and technological qualification for the floating offshore wind development. The Norwegian approach is evaluated in the view of the key success factors of the offshore wind market highlighted by the World Bank. One particularity of the national Norwegian offshore landscape is the usage of the Norwegian floating wind for decarbonification and “greenification” of the oil and gas industry. Learning from the Hywind projects and Norwegian approaches and experiences for the floating offshore wind on the national and international level has potential in contributing to enhance the road maps for floating offshore wind in terms of technology qualification, innovation and cost reduction. This article offers a handful of key take away points for industry and decision makers about development of the floating offshore wind.
The Co-development of Offshore Wind and Hydrogen in the UK – A Case Study of Milford Haven South Wales
Authors: Fan Fulin , Nwobu John , Campos-Gaona David 
Published: May 2023

Abstract
Green hydrogen produced from renewable energy resources can not only contribute to the decarbonisation of different energy sectors, but also serve as a carrier for long-distance delivery of renewable generation, offering a cost-effective way to exploit the renewables far from electrical grids. To facilitate the co-development of offshore wind and hydrogen, the paper develops a modelling framework to dispatch power and hydrogen flows across dedicated offshore wind hydrogen production systems to meet onshore hydrogen demands while keeping similar state of charge levels between multiple systems. Then the hydrogen supply to shore and the system investments and ongoing costs are discounted to their present values to calculate the levelised cost of hydrogen, which is minimised by the particle swarm optimsiation algorithm to suggest the best capacities of hydrogen system components including converters, desalination devices, electrolysers, compressors and storage assets. The proposed modelling framework is tested based on a case study at Milford Haven South Wales which is evaluated to have massive offshore wind resources in the Celtic Sea and comparable demands for hydrogen by 2040. The optimisation results are presented based on the techno-economic input parameters projected for 2030 and 2050 scenarios and discussed alongside the influences of technology advances on the system optimisation and resulting metrics including the levelised costs of hydrogen, net present values and potential levels of green hydrogen supply to Milford Haven.
Biocompatibility evaluation of antioxidant cocktail loaded gelatin methacrylamide as bioink for extrusion-based 3D bioprinting
Authors: J Anupama Sekar , Velayudhan Shiny , PR Anil Kumar 
Published: May 2023

Abstract
Three-dimensional (3D) liver bioprinting is a promising technique for creating 3D liver models that can be used for in vitro drug testing, hepatotoxicity studies, and transplantation. The functional performance of 3D bioprinted liver constructs are limited by the lack of cell–cell interactions, which calls for the creation of bioprinted tissue constructs with high cell densities. This study reports the fabrication of 3D bioprinted liver constructs using a novel photocrosslinkable gelatin methacrylamide (GelMA)-based bioink formulation. However, the formation of excess free radicals during photoinitiation poses a challenge, particularly during photocrosslinking of large constructs with high cell densities. Hence, we designed a bioink formulation comprising the base polymer GelMA loaded with an antioxidant cocktail containing vitamin C (L-ascorbic acid (AA)) and vitamin E (α-tocopherol (α-Toc)). We confirmed that the combination of antioxidants loaded in GelMA enhanced the ability to scavenge intracellular reactive oxygen species formed during photocrosslinking. The GelMA formulation was evaluated for biocompatibility in vitro and in vivo. These results demonstrated that the bioink had adequate rheological characteristics and was biocompatible. Furthermore, when compared to bioprinted constructs with lower cell density, high-density primary rat hepatocyte constructs demonstrated improved cell-cell interactions and liver-specific functions like albumin and urea secretion, which increased 5-fold and 2.5-fold, respectively.
The role of green roofs as urban habitats for biodiversity modulated by their design: a review
Authors: Coulibaly Sékou F M , Aubry Christine , Provent Fanny , Rousset-Rouvière Sophie , Joimel Sophie 
Published: May 2023

Abstract
In view of the demographic revolution and the rapid development of urban environments, the installation of green roofs could be a tool to ensure human well-being (e.g. heat island reduction, rainwater management), or to increase urban biodiversity. However, the relationships between biodiversity and green roofs are not yet clear and little research has looked into this. We therefore reviewed studies on the overall biodiversity of green roofs. Our review has shown that there is a lack of knowledge of the biodiversity of green roofs, with recent consideration. We highlighted the importance of green roof contribution, in maintaining urban biodiversity through three lines of research: characterization, modes of use and design. Furthermore, we found that there were very few studies on soil biodiversity on this topic. We concluded that green roof construction guidelines should integrate soil communities into their design and aim to be heterogeneous at roof and landscape level. Future research should focus on the diversification and redundancy of rooftop conditions in the urban matrix. This would increase the area of green habitats and the success of species dispersal in cities.
Integral preserving discretization of 2D Toda lattices
Authors: Smirnov Sergey V 
Published: May 2023

Abstract
There are different methods of discretizing integrable systems. We consider semi-discrete analog of two-dimensional Toda lattices associated to the Cartan matrices of simple Lie algebras that was proposed by Habibullin in 2011. This discretization is based on the notion of Darboux integrability. Generalized Toda lattices are known to be Darboux integrable in the continuous case (that is, they admit complete families of characteristic integrals in both directions). We prove that semi-discrete analogs of Toda lattices associated to the Cartan matrices of all simple Lie algebras are Darboux integrable. By examining the properties of Habibullin’s discretization we show that if a function is a characteristic integral for a generalized Toda lattice in the continuous case, then the same function is a characteristic integral in the semi-discrete case as well. We consider characteristic algebras of such integral-preserving discretizations of Toda lattices to prove the existence of complete families of characteristic integrals in the second direction.
Fungicide resistance of Fusarium oxysporum f.sp. cepae isolated from shallot in Brebes
Authors: Poromarto S H , Hadiwiyono  , Supyani  , Supriyadi  , Permatasari F I 
Published: May 2023

Abstract
Brebes, Central Java is the largest shallot centre in Indonesia. Shallot are planted intensively in this area. The most detrimental disease of the plants is moler caused by Fusarim oxysporum f.sp. cepae, FOCe. Fungicide applications are carried out periodically every 3-5 days. However, the disease severity is still quite high. There is even a tendency to increase every year. In addition, continuous use of the fungicides can cause adverse effects on the control itself, such as the emergence of fungicide resistance. Field testing aims to evaluate the effectiveness of fungicides against moler disease. Lab testing to evaluate FOCe resistance to fungicides. The fungicides used in this research are the fungicide Brands widely used by farmers in this area. The efficacy test results showed that the three Brands were not effective (efficacy below 50%). There are indications that FOCe is resistant to two merks of fungicides with active ingredients, Chlorothalonil and Propineb.
Connectivity and integration analysis of karst tourism objects in Wonogiri with Space Syntax Method
Authors: Nugroho Purwanto Setyo , Purwani Ofita , Winarto Yosafat , Triratma Bambang , Setyaningsih Wiwik 
Published: May 2023

Abstract
Gunung Sewu in Wonogiri Regency has been recognized by UNESCO with its designation as a Global Geopark Natural Heritage. The recognition is based on its karst formation which considered to have universal value therefore needs to be protected. The recognition is a significant capital for tourism development. However, this global geopark is still underdeveloped in Wonogiri area. To plan tourism development in Wonogiri area which has been marginalized in decades in tourism development, we use space syntax tool. This tool which is developed in University College London has a strength in analyzing spatial configuration that can help predict human spatial behavior. The results show that the distribution of Karst formations in Gunung Sewu, Wonogiri Regency has variations in the value of the level of connectivity and integration that can be used as priority considerations in its development.
Analysis of potential water recharge areas using spatial multi-criteria evaluation in Denpasar City, Bali, Indonesia
Authors: Trigunasih N M , Wiguna P P K , Arthagama I D W , Susila K D , Narka I W , Handayani N P U 
Published: May 2023

Abstract
Occupied by a fairly large population, Denpasar City (Bali Province, Indonesia) is experiencing landuse change into residential areas. A reduction in the water recharge area has been recognized as one of the consequences. The purpose of this study was to determine the condition and distribution of water recharge zones in the city. Geographic Information System (GIS) was used to overlay maps of soil type, rainfall, slope, and landuse as the input to Spatial Multi-Criteria Evaluation (SMCE). The research output is a map of potential recharge zones in Denpasar City. Results showed six criteria for their conditions: good, normal/natural, slightly degraded or at the early stage of degradation, moderately degraded, degraded, and severely degraded. The majority of the potential water recharge areas were moderately degraded (covering an area of 7860.87 ha), degraded (2049.19 ha), degraded (1653.21 ha), severely degraded (292.45 ha), good (280.29 ha), and normal/natural (205.96 ha).
Effect of size and additives on the decomposition process and nutrient content of urban organic waste compost
Authors: Najib Nardy Noerman , Nugroho Hunggul Yudono Setio Hadi , Isnan Wahyudi , Saad Muh. 
Published: May 2023

Abstract
To participate in overcoming the problem of 500 tons of organic waste per day in Makassar City, in 2017-2019 Environment and Forestry Research and Development Institute of Macassar conducted research activities to develop community-based organic waste management models for pollution control and urban farming development. One of the activities is making compost from urban litter using a shredding machine to speed up the decomposition process, and mixing household waste rich in N, P, K and micro nutrients to increase the nutrient content of the compost. Observations showed that the litter mincing process significantly accelerated the decomposition process. Furthermore, the addition of nutrient-rich material from household waste into compost material has increased the nutrient content of compost which is higher than the SNI standard, thereby increasing the competitive value of compost against factory-made chemical fertilizers. These two activities have an impact on increasing public interest in managing urban organic waste to reduce pollution while developing urban farming.
Potential mapping of rural tourism clusters through application of spatial decision making system as a base of sustainable tourism planning
Authors: Fafurida  , Purwaningsih Y , Mulyanto  , Suryanto  
Published: May 2023

Abstract
Indonesia is rich of nature, culture, customs, culinary, and religions spread over many regions. The majority of Indonesia territory is rural areas. The existing potentials and attractions in rural areas make a lot of villages developed into tourist villages. One region that has quite a high number of tourist villages is Semarang Regency, Central Java, Indonesia. The high number of tourist villages that belongs to Semarang Regency is actually not in line with the high length of stay of the visiting tourists. Therefore, it requires the right method to develop the rural tourism potential, which is cluster-based rural tourism development. The purpose of this research is to develop a methodology for identifying the potential area of rural tourism clusters in geographic feature. The method used is Geographic Information System (GIS) based Kernel Density Estimation (KDE). The analysis brings to a map that identifies regions with strong cluster potential to develop the informative rural tourism. The map generated clearly indicates that the regions with strong potentials to become tourist village cluster in Semarang Regency are the combined cluster areas of Ungaran and Bergas District and Sumowono District. Hopefully the generated map will be informative for the stakeholders, the policy makers, and the tourism development area organizers.