bluuebunny/crossref_metadata_2025_split huggingface dataset:
Consideration of river governance based on the concept of urban spatial resilience
Authors: Chen Feng , Yuan Wenqi , Wang Li , Ding Jie , Li Chengling , Wang Bo 
Published: February 2022

Abstract
The reasonable scale of urban river ecological space and the connectivity of bank and slope water and soil exchange are the basic conditions to keep the flow of matter, energy and species in water unimpeded, as well as the way out for the dilemma of urban river ecological governance. The concept of resilience in spatial planning is used to break the artificial partition between river land space and water space, explore the compound function of urban space, and realize the way of integration and synergism of land and water space.The research shows that scientific overall planning and rational utilization of urban space is the basis of realizing land function combination and solving urban river governance predicament. Urban spatial planning and layout should highlight the backbone role of river-dominated urban eco-environment texture, restore the function of river network ecological corridor, build the integration of public open space and river space, optimize the use of land resources for achieving functional compounding; Meanwhile, expand the three-dimensional space of the river, increase the spatial diversity, improve the openness of the waterfront space for achieving functional balance through collaboration. To break the artificial boundaries of waters and land areas and form the integration of land and water area, the water environment management of river spatial design needs to focus on key elements such as the urban river network plane shape, the spatial layout of river sections, the ecological treatment and reconstruction of bank protection, and the temporal and spatial evolution of rivers. Application of multi-natural river ecological restoration, near-natural river construction, semi-natural ecological flood control and other technologies can achieve the ecological treatment effect of bank protection and improve the ecological permeability of bank slope. By opening up the river space, it provides a limited dynamic change space for the river bed and a space that evolves with time, which is conducive to exerting the function of ecological corridor of urban river system and driving the improvement and promotion of ecological environment in urban areas.
Experimental study on instantaneous plume characteristics based on flame 3D reconstruction
Authors: Lu Ziping , Wang Dong , Jiang Nan , Cao Bei , Yang Lizhong , Zhang Yuyang , Zhai Chunjie 
Published: February 2022

Abstract
3D flame can directly represent the combustion status of combustible and fire scale, but flame pulsation makes it difficult for existing 3D reconstruction technology to achieve flame reconstruction. In response to this situation, we use computer image processing technology to propose a flame model based on the cylindrical hypothesis to realize the 3D reconstruction of the flame in this paper. On this basis, we measured the volume and height of flames with different fuel flow rates for 6 types of burners. The results show that the average flame height and volume increase with the increase of fuel flow rate, but the average flame height decreases with the increase of the burner size, and there is no obvious correlation between the average volume and burner size.
Research on coal moisture analysis model based on near infrared spectroscopy
Authors: Zhou Yiyou , Zheng Quanjun , Hu Xiaoying , Liang Hui , Dong Changqing 
Published: February 2022

Abstract
In order to make full use of the advantages of rapid and non-destructive measurement of coal moisture by near-infrared spectroscopy, the 29 original coal samples in the experiment were artificially humidified, and the moisture content of each coal sample was controlled within a different interval of 0-40%; diffuse reflectance near-infrared spectra were collected on the coal samples. The sample was selected according to the random method, Kennard-Stone (KS) method, and Rank-KS method for the selection of calibration set and prediction set. The prediction models of coal moisture content were established by multiple linear regression (MLR) and partial least squares algorithm (PLS) combined with different spectral pretreatment methods, furthermore, water modeling based on BP neural network was established according to optimal sample classification. The results show that when Rank-KS algorithm was used to select correction set and prediction set, the prediction ability of water content prediction model can be significantly improved by using either MLR or PLS, and the root mean square error of prediction (RMSEP) can be minimized; the moisture prediction model of the BP neural network algorithm based on the full-spectrum feature information is the best, the RMSEP value is the smallest among all models, and the model has the best prediction ability.
Ideal radiation parameters of energy-saving coatings for exterior wall
Authors: Yao Hongxin , Yi Yang , Wang Xiyao , Ye Hong 
Published: February 2022

Abstract
Optimizing the solar absorptivity (α) and thermal emissivity (ε) of coatings for the exterior wall is an effective way to reduce building energy consumption (BEC). Guangzhou, Hefei and Beijing are chosen as the representative cities of the hot, hot-summer and cold-winter, and cold regions respectively, and the effects of α and ε of the exterior surface of the wall on the BECs of the residential buildings are studied. It is found that the BEC is much more sensitive to α than to ε, especially in summer, which means that solar irradiation is the main factor affecting the BEC. The optimal combination for Guangzhou, Hefei, and Beijing are (α=0 & ε=1), (α=0 & ε=0), and (α=1 & ε=0) respectively. The energy-saving performances of the six existing exterior wall coatings are evaluated, and the results show that the energy-saving performances of the coatings still need to be improved. Taking the most energy-efficient one in the six coatings as an example, the energy-saving potentials of coatings for Guangzhou, Hefei and Beijing are approximately 11%, 2% and 4% respectively.
The screening of high-efficiency ammonia-nitrogen degrading bacteria and their influencing factors were studied
Authors: Huang Xu , Chen Wenlong , Cai Mingxuan , Hei Liang 
Published: February 2022

Abstract
By enriching the culture medium, three dominant bacteria(X1, X2 and X3) were selected from the farmland sludge. The degradation effect of X1, X2, X3 and mixed bacterium(X123) under different initial ammonia nitrogen(NH3-N) concentration, pH and C/N were studied under laboratory, the effect of X123 was compared with purchased bacteria(S1, S2 and S3) and strains in published literature. The results showed that X123 had the best effect when the initial NH3-N concentration was 20 mg·L−1, pH was 7 and C/N was 10, the degradation rate was 96.4% after 2 days of culture. Comparing X123 with S1, S2 and S3, it was found that X123 had the best effect. Comparing X123 with the strains in published literature, it can be seen that the difference for the degradation of NH3-N was very small, and the growth conditions of the strain were almost same. It was shown that X123 can effectively degrade NH3-N from wastewater, which has potential of application for treatment of nitrogen polluted wastewater.
Research on prefabricate-decoration integration technology based on prefabricated bathroom
Authors: Cheng Caishu , Gao Ruofan , Xu Guangti , Liu Jiaqi , Ran Kailin 
Published: February 2022

Abstract
According to the 14th Five-year Plan proposed in China, the development of green buildings is one of the most important measures to accelerate the promotion of green and low-carbon development. Prefabricated buildings have been widely promoted and applied in furnished apartments because of the high construction efficiency, energy saving and emission reduction. In order to solve the problem of the storey height wasting of the furnished apartment and the reasonable application of energy saving, this paper puts forward a new prefabricate-decoration integration technology based on the prefabricated bathroom, and realizes an integrated design of the components produced in the factory. The two-story structure on the basis of prefabricated bathroom is assembled in the form of furniture.
Review on mechanism and technical measures of urban rainwater harvesting
Authors: Zhang Dongqing , Ding Xiangyi , Liu Jiahong , Mei Chao 
Published: February 2022

Abstract
The urban water problem has become one of the most significant problems hindering sustainable urban development. Rainwater harvesting and utilization is a green solution to alleviate the urban water problem. However, existing urban rainwater management pays more attention to flood control and lacks systematic planning for rainwater harvesting in China. In this paper, the calculation methods of rainwater harvesting potential are investigated, and the difference of rainwater harvesting system between the traditional model and sponge model is compared based on the rainwater harvesting mechanism. In addition, the study progress of four representative rainwater harvesting measures (green roofs, bioretention ponds, infiltration wells, and rainwater tanks) is reviewed and four representative optimization tools are listed. Moreover, we summarized the challenge of rainwater harvesting and provided recommendations for future research on the rainwater harvesting system. This review aims to provide theoretical support for the comprehensive utilization of urban rainwater resources to promote the sustainable development of cities.
Development of innovative technologies for manufacturing of certified narrow body aircraft composite flap
Authors: Alberotanza D. , Pinto F. , Polo S. , Zaccaria G. , Capoccello D. 
Published: February 2022

Abstract
Fiber-reinforced polymer composites perfectly meet the basic requirements of aircraft flaps being weight reduction critical for fuel saving and increased payload. New technologies have been designed and developed to increase competitiveness in the use of composite materials by ensuring a continuous manufacturing process, a streamlined and balanced flow of activities, synchronized as much as possible with customer and market demand, reducing material scraps and non-value-added activities.
Resin excess, tool mark-offs, out of tolerance dimensions are potential defects generated during the hand lay-up process of the skin manufacturing of composite flap.
Innovative technologies for manufacturing of certified narrow body aircraft composite flaps have been designed and developed in order to achieve the best quality of the product and the program ramp-up.
Detailed tooling analysis and several simulations, included process flow and bottlenecks detection, have been performed in order to design the new process with high level of automation and reliable devices for human safety and production repeatability, that fully meets the customer’s expectations.
Preliminary design of a BWB UAV for highway traffic monitoring
Authors: Dimitriou S , Kapsalis S , Dimopoulos T , Mitridis D , Pouchias K , Panagiotou P , Yakinthos K 
Published: February 2022

Abstract
The current work presents the preliminary design procedure of a small-scale, fixed-wing Unmanned Aerial Vehicle (UAV), incorporating the novel Blended-Wing-Body (BWB) layout configuration. The UAV is designed to support a Cooperative-Intelligent Transport System (C-ITS), for monitoring traffic conditions at large national highways. The presented UAV design procedure emphasizes on both aerodynamic and stability behavior, aiming to a high aerodynamic efficiency and the satisfaction of the mission requirements. The design is supported by CFD analyses, to determine the aerodynamic and stability coefficients. Following the CFD modeling, the performance parameters of the platform are calculated. Furthermore, an internal layout study is conducted to integrate all the necessary internal components, determining the center of gravity. Finally, the overall UAV design concludes to an optimum configuration of the UAV-ITS, satisfying all the aerodynamic, stability and mission requirements.
Analysis of vulnerability of ATM to weather phenomena
Authors: Vito Vittorio Di , Bucchignani Edoardo , Montaquila Roberto Valentino , Cerasuolo Giovanni , Montesarchio Myriam , Zollo Alessandra Lucia , Cinquegrana Davide 
Published: February 2022

Abstract
Weather conditions and Air Traffic Management (ATM) operations are strongly related, due to the relevant influence that the observed and forecasted weather conditions into assigned airspace have on the operational conditions that are therefore possible for such airspace. In the framework of the SESAR JU funded project CREATE (Innovative operations and climate and weather models to improve ATM resilience and reduce impacts), therefore, a dedicated study has been carried out in order to investigate the relation between weather and ATM. Such study both investigated the consequences that adverse weather conditions can have on ATM and, on the other side, addressed the currently and future available tools that can support ATM in the prediction and management of weather conditions from the aeronautical operations point of view. In this paper, the results of such literature study are outlined. More in details, in the paper first the main outcomes of the study are summarized, in terms of identification of the most relevant weather phenomena that affect the ATM operations, indication of their main impacts on them in terms of operational disruptions and, finally, identification of the associated level of severity. In particular, the above indicated aspects are addressed by taking into specific consideration the enroute and the TMA (Terminal Manoeuvring Area) flight phases and, for each of them, the main affecting weather phenomena and the main affected operations are identified. Then, in the paper the results of the study are summarized about the identification of the most relevant meteo tools that are expressed by state-of-the-art technologies to support the ATM operations in order to properly take into account the weather conditions in a precise and timely manner. This study addresses both the review of available and perspective tools for weather reporting and of the available and perspective numerical models supporting ATM in terms of weather models and air quality models.
Safety Performance Functions to predict Separation Minima Infringements in en-route airspace
Authors: Jurado R Delgado-Aguilera , Gómez Comendador V F , Zamarreño Suárez M , Pérez Moreno F , Verdonk Gallego C E , Arnaldo Valdés R M 
Published: February 2022

Abstract
The objective of this methodology is to characterise the safety of air routes under a systematic framework, in terms of Separation Minimum Infringements (SMI) between en-route aircraft based on models known as Safety Performance Functions (SPF). Bayesian Networks have been selected as techniques with high predictive capability and low probability event estimation. Moreover, they allow the integration of knowledge modelling with data inference. It is complex to develop a Bayesian Network model for SMI prediction. It is necessary to integrate the available knowledge about the precursors of SMIs together with the accumulated knowledge from the analysis of the collected data into a conceptual framework. This framework underpinning the Bayesian Network model focuses on the Closest Point of Approach (CPA) analysis and considers the general scenario of aircraft evolution in an air traffic sector. In order to translate this conceptual framework into a set of causal sub-networks, the ATM barrier and event tree models are used.
Conceptual design of a fixed wing hybrid UAV UUV platform
Authors: Papadopoulos C , Vlachos S , Yakinthos K 
Published: February 2022

Abstract
In this work, the conceptual design methodology of a hybrid Unmanned Aerial Vehicle (UAV) – Unmanned Underwater Vehicle (UUV) platform is presented. As the mission complexity and the need for interoperability between different platforms grows more demanding by the day, hybrid platforms are becoming an essential solution. Hybrid UAV-UUVs can operate seamlessly and repeatedly in both the aerial and underwater environments, something that numerous animal species already execute in an optimized way. The design methodology starts with the review of the few available prototypes, creating initial design trends and continues with analytical calculations. These calculations are based on aircraft design textbooks and are modified to take into account the special characteristics of a hybrid platform, such as the means of transition between the water and the air. A Blended Wing Body (BWB) layout configuration is selected for the numerous aerodynamic advantages that it offers. The analytical calculations are then validated with the use of high fidelity CFD calculations. The results from the conceptual design phase indicate that the proposed methodology for hybrid UAV-UUV configurations provides a good design accuracy. Finally, the outcome of this methodology, which is a hybrid UAV-UUV platform is potentially the answer to the operational gap for missions that include both underwater and aerial environments.
Development of plasma actuators for re-ignition of aeroengine under high altitude conditions
Authors: Mehdi Ghazanfar , Sara Bonuso , Maria Grazia De surname 
Published: February 2022

Abstract
Re-ignition of aeroengine under high altitude conditions is of great importance to the safety and use of lean-burn engines. The present work investigated the experimental and numerical analysis of flow and re-ignition characteristics in a rectangular burner. A ring-needle type plasma actuator was developed and powered by high voltage nanopulsed plasma generator with different percentage values of amplitude voltage and frequencies. Flow visualizations by using high speed camera and Proper Orthogonal Decomposition (POD) were performed to recognize the dominant flow structures. Experimental results showed the transport effects such as induced flow with an impact on the recirculation zone near the corners of combustor, improving the mixing performance, which could be contribute to the reduction of ignition delay timings. Experimental characterization in non-reactive flow allowed the estimation of the electrical power and the optimal reduced electric field (EN) value, which was then used as input to the numerical study for the flame ignition analysis. Ignition characteristics were analyzed by coupling two different numerical tools ZDPlasKin and Chemkin. It was noticed that time required to achieve the maximum flame temperature with plasma actuation is significantly reduced in compared with autoignition timings (clean case). Maximum reduction in ignition timings was observed at inlet pressure 1 bar (3.5×10-5 s) in respect to clean case (1.1×10-3 s). However, as the inlet pressure is reduced, the ignition delay timings were increased. At 0.6 bar flame ignition was occurred at 0.0048s and 0.0022s and in clean case and plasma actuation case, respectively.
Analysis of working fluids applicable for high-temperature loop heat pipe applications
Authors: Gakal P , Mishkinis D , Leilands A , Usakovs I , Orlov R , Rogoviy Y 
Published: February 2022

Abstract
An objective of this study was to perform an analysis of available working fluids and select those one(s) that will be able to comply with the specific requirements of the ultra-high bypass ratio (UHBR) engine air bleed system and ensure efficient LHP operation. A multi-step approach was applied to analyse more than 700 working fluids and select four potential candidates, taking into account (1) working fluids compliance with EU regulations; (2) working fluids freezing, boiling, and critical points for the operating temperature range; (3) working fluids specific properties that influence the LHP performances. Selected fluids (toluene, acetone, methanol, 1,2-dichlorobenzene) were subjected to accelerated life tests to check their chemical compatibility with AISI 316 stainless steel to be used as the LHP material. Based on the results obtained, the toluene was selected as the working fluid for application in the innovative LHP-based thermal management solution for the UHBR engine air bleed system.
Ventilation Analysis of Simplified Engine Nacelle for Pusher Aircraft
Authors: Olejnik A. , Kiszkowiak L. , Dziubmski A. 
Published: February 2022

Abstract
The paper contains the results of CFD analysis of flow inside the simplified engine nacelle, containing the engine in a pusher configuration. The authors have tested a set of solutions to increase an efficiency of the cooling system of this type of engine. Unfortunately, all the positive effects of the fact, that the aircraft engine appears in the wake of the propeller during taxiing and waiting for takeoff, are nonexistent in this type of configuration. An engine overheating is here a problem, because an airflow has to be pulled through the nacelle to cool down the engine block and radiators of cylinder heads. That design demands to analyze the cover shape of the nacelle, to properly use the main propeller pressure jump on the one hand, and rather adequate and complicated flow inside the nacelle to be modelled on the other. The aircraft CAD geometry has been simplified to allow for simple changes of the nacelle cover shape and easily introducing new inlets and outlets. The results prove, that the proper application of scoops gives even better result, than simply removing the cover and baffles from the engine. The exhaust scoops should be placed near the propeller plane in such pusher configuration, because the engine is not covered by the propeller wake.
Automatic tool-based pre-processing of generic structural models for water impact simulations in the aircraft pre-design
Authors: Leon Muñoz C , Petsch M , Kohlgrüber D , Pedelaborde-Augas M 
Published: February 2022

Abstract
The integration of automated tool capabilities for the generation of models for transient dynamic calculations in the scope of the aircraft pre-design is described in this paper. The Python-based DLR framework PANDORA, initially developed for the modelling and the sizing of aircraft structures in multidisciplinary process chains, is considered for this work. The focus lays on the generation of suitable numerical models for the water impact simulation. To enable this, the internal tool database was extended to consider additional features such as contact definitions, mesh-free formulations, enhanced connection models and specific control options. The generation of the CPACS-based FE aircraft model was extended by means of discretisation and additional structural components. The generation of the water domain was also included according to user defined inputs like pool dimensions, initial conditions and the selection of an appropriate fluid modelling approach. In addition, a feature to launch a simulation directly within the framework was included. Finally, options to retrieve and visualize results from finished water impact simulations were also integrated, allowing to display contour and time history plots.