bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simulation analysis of effective reflector area extension in umbrella antennas
Authors: Zhang Lei , Ma Xiaofei , Fan Yesen 
Published: August 2024

Abstract
The umbrella antenna, renowned for its high precision, rigidity, and reliability in deployment and retraction, is one of the most widely used spatial deployable antenna configurations in spacecraft. Traditional designs typically include an indented boundary rope net to counteract the inward force exerted by the metal mesh. However, this design choice, unfortunately, reduces the reflector’s effective area, subsequently decreasing the antenna’s gain. This paper offers a comprehensive summary and analysis of methods aimed at enhancing the effective reflective surface area of umbrella antennas. Through modeling and simulation, the study explores an umbrella antenna design enhanced with additional boundary support, detailing the expansion at the boundary through varying numbers of rib tubes. A comparative analysis of the effective reflective surface area before and after the expansion demonstrates that the incorporation of supporting structures significantly increases the utilization rate of the reflector’s geometric area.
Effect of compressibility on instability of boundary layer over a spinning cone in hypersonic flow
Authors: Gu Yiyang , Dong Hao , Liu Shicheng , Jiang Yinglei 
Published: August 2024

Abstract
Spinning vehicles achieve gyroscopic effects by rotating around their axis. However, transition significantly influences the stability of flight. In this work, a study of instability on the unstable modes in boundary layers over a rotating cone with a 7° half-apex angle in hypersonic flows is presented with linear instability analysis (LST). To quantify the effect of compressibility, Mach numbers (5-10) are considered, and a higher rotational velocity is considered for analysis of centrifugal mode. MMM, CFM, and CM shift towards low frequency, low streamwise, and circumferential wavenumbers. Also, the maximum amplification rate of MMM, CFM, and CM decreases with Mach number, suggesting a stabilizing effect of compressibility on the boundary layer over a spinning cone in hypersonic flows.
Impact analysis of rocket gas jet on offshore platform
Authors: Xu Jun , Gui Hongbin , Zhao Weidong , Gong Qingtao , Zhang Yan 
Published: August 2024

Abstract
To prevent the high-temperature and high-pressure impact jet from breaking the surface structure of the launching platform during the launch of the rocket at sea, the impact effect of the gas jet of the sea rocket launch on the launch platform deserves to be studied. This paper considers the motion attitude of the launch platform in seawater and the presence of multiple gases in the rocket exhaust jet. Based on the realizable k-ε turbulence model, the numerical model of the gas jet impacting on the launch platform from the sea launch is built, and the finite volume method is used to discretize the control equations, aiming to obtain the impact cloud image of the gas jet of the rocket at different launch heights and different launch angles on the launch platform surface and to analyze the change of the impact pressure history. The results show that the initial launch height and launch angle of the rocket have a great influence on the peak impact pressure on the surface of the launch platform. The impact effect of the gas jet is mainly related to the relative position of the launch platform surface in the Mach disk. Reasonable changes in the launching angle can effectively reduce the impact of the gas jet on the launch platform and provide technical references for the launch of the rocket at sea.
Inflight monitoring of ASO-S satellite during the year 2023
Authors: Jiang Hu , Deng Lei , Zhu Cheng , Zhang Zhe , Bai Xianyong , Huang Yu , Dai Shuang , Cai Jiji , Fan Chengcheng 
Published: August 2024

Abstract
Advanced Space-based Solar Observatory Satellite (ASO-S) is a space project sponsored by the Chinese Academy of Sciences; its goal is to monitor solar activities during the 25th solar cycle. Data from ASO-S is open to all scientists who are interested in it. It is expected to collect raw scientific observations of the Sun, which probably lead to more discoveries about the Sun. As the core members of the ASO-S mission, the authors of this paper have privileged rights to handle the first-hand data from ASO-S. Based on the raw data transmitted from ASO-S, the authors focus on the orbit variation with time, quick-look products of 3 main payloads. First, the authors collect the precision orbit elements provided by the onboard GNSS receivers; with the help of professional orbit analysis software, as of Dec. 14, 2023, orbit altitude and local time of descending node are derived. Second, three quick-look products from three different payloads are derived by means of preliminary image processing techniques. Based on the above-mentioned analyses, it has shown that the orbit for ASO-S is slightly changing and stable, which has little influence on ASO-S mission operation; quick-look product quality indicates that the status of payloads is healthy, which can support ASO-S mission to run smoothly and continuously during the rest of its lifespan.
Free vibration exploration of axially functionally graded carbon nanotube-reinforced beams through an innovative perturbative methodology
Authors: Chen Chen , Zhou Lilin , Ye Tianyu , Li Daokui 
Published: August 2024

Abstract
Axially functionally graded (AFG) carbon nanotube-reinforced composite (CNTRC) emerges as a promising solution for tailoring the stiffness and strength of various beam-like structures. Applications range from optimizing the weight-to-strength ratio of airplane wings to fine-tuning the frequency of micro-beam sensors, and even alleviating stresses induced by centrifugal forces or temperature gradients in turbine blades. However, the challenge of solving variable coefficient partial differential equations (VCPDEs) arising from the axial material gradient limits conventional methods to numerical and simulation techniques. In this study, a novel perturbation approach (PA) customized for AFG-CNTRC is highlighted for solving the problem analytically, simply, and precisely. First, the vibration model of an AFG-CNTRC beam is established according to the Euler-Bernoulli theory (EBT). Second, the vibration governing equations are solved by the PA and the state space method (SSM) analytically. Finally, the adaptivity and accuracy of the PA are validated and the effects of carbon nanotubes (CNTs) distribution patterns are analyzed. It is found that increasing CNT content at either end will increase the natural frequency for symmetric boundary conditions (BCs). The frequency decreases with the degree of nonlinearity distribution of CNTs. The frequency under the C-F BC exhibits low sensitivity to parameter effects.
Numerical study of natural laminar flow based on CRM NLF test
Authors: Yang Xinyu , Zhong Yuan 
Published: August 2024

Abstract
The laminar flow design is increasingly important to recent aircraft development. This research aims to study the natural laminar flow phenomenon using computational flow dynamics (CFD) methods for wing-body geometry. We introduce a workflow with mesh generation and solver choices to simulate the natural laminar flow. The transition prediction results are validated by the results of the Common Research Model Natural Laminar Flow (CRM NLF) wind tunnel test. Based on the wind tunnel experiments for the laminar CRM model, we show that the numerical calculation can reveal the laminar flow mechanism. Most saliently, the laminar simulation results fit quantitatively to CRM NLF data regarding transition front and pressure distribution. The study would pave the way for future aircraft design to enhance the reliability of laminar flow performance evaluations.
Hysteresis modeling of piezoelectric actuators based on neural network considering load and environmental stiffness
Authors: Zhu Binkai , Zhou Mengde , Ren Yuhang , Zhang Xinyu , Zhao Qi , Wu Wei , Liu Wei 
Published: August 2024

Abstract
Piezoelectric actuators (PA) are widely used in the field of aircraft wind tunnel testing due to their high displacement resolution and fast response speed. However, the displacement exhibits hysteresis and the characteristics shift under time-varying loads, making it challenging to enhance precision, ultimately leading to distorted test results. To solve this problem, a novel modeling method of PA hysteresis based on NARXNN (Nonlinear Auto-Regressive model with Exogenous Inputs Neural Network) considering load and environmental stiffness is proposed in this paper. In this method, hysteresis modeling of PA based on NARXNN is established considering time-varying load and environmental stiffness as the extended inputs. The hyperparameters of the neural network were optimized based on the particle swarm optimization (PSO). Experimental results show that the RMSE of the hysteresis model considering load and environmental stiffness is reduced by 74.86%-99.69% compared with the classic PI (Prandtl-Ishlinskii) model, which verifies the accuracy and adaptability of the NARXNN modeling method.
Research on welding technology of ultra light RF coaxial cable components for aerospace applications
Authors: Xie Qian , Wang Shuaibo , Cai Libing , Zhao Min , Huang Hongyu 
Published: August 2024

Abstract
With the development of space satellite models towards miniaturization, the demand for weight reduction of subsystems and single equipment has increased sharply. As RF cable components serve as microwave link transmission channels, the large amount of satellite usage puts higher requirements on their lightweight. This article proposes a high reliability welding process method for the silver plated aramid fiber outer shielding layer of ultra light RF coaxial cables, which addresses issues such as poor solder wettability and low solder filling rate. This improves the solderability of the silver plated aramid fiber shielding layer, increasing the solder filling rate from the original 60% to over 90%, meeting the quality control requirements of solder joints in aerospace cable components, and achieving batch stable welding of ultra light RF cable components with high reliability and high solder filling rate.
Operation optimization of hydrogen-containing energy storage cogeneration type microgrid based on improved dung beetle algorithm
Authors: Wang Bowen , Zhao Bingyan 
Published: August 2024

Abstract
An enhanced dung beetle optimization algorithm is used to solve the comprehensive optimization model of a cogeneration microgrid with hydrogen storage, with the optimization objective of minimizing the microgrid’s overall operation cost. The model is intended to address the issue of low thermal energy utilization efficiency of the hydrogen energy system of a cogeneration microgrid with hydrogen storage. The findings demonstrate that the suggested plan may more effectively satisfy the thermoelectric load requirements of the microgrid and guarantee the microgrid’s steady and independent operation, thereby fulfilling the objectives of energy conservation and emission reduction.
Research on accelerated corrosion of 0Cr18Ni9 stainless steel in marine atmospheric environment of the South China Sea
Authors: Ding Kangkang , Fan Lin , Duan Tigang , Peng Wenshan , Xin Yonglei , Hou Jian , Sun Mingxian 
Published: August 2024

Abstract
The corrosion problem of metal materials in the South China Sea is serious. In order to meet the needs of rapid construction and development of islands and reefs in the South China Sea, it is necessary to establish a rapid evaluation method for the environmental adaptability of materials, which can provide effective guidance for material selection and corrosion control in marine engineering design. According to the atmospheric environment characteristics of islands and reefs in the South China Sea, an accelerated corrosion environment spectrum was designed, and then the atmospheric corrosion behavior in the South China Sea and the indoor accelerated corrosion test environment was studied. The correlation between indoor and outdoor corrosion was verified based on grey correlation analysis, and the prediction model of atmospheric corrosion based on indoor accelerated test results was established. The results show that the corrosion morphology, corrosion type and corrosion kinetic laws of 0Cr18Ni9 stainless steel under the indoor and outdoor test conditions had high similarity. Also, their correlation degree reached 0.8052, further indicating a good correlation between indoor and outdoor corrosion. The established prediction model had a relatively high accuracy (Level 2), and its prediction error to outdoor corrosion result was less than 26.13%.
Nonequilibrium phase transitions in a 2D ferromagnetic spins with effective interactions
Authors: Wordofa Tola Dagne , Bekele Mulugeta 
Published: August 2024

Abstract
The study of nonequilibrium steady-state (NESS) in the Ising model offers rich insights into the properties of complex systems far from equilibrium. This paper explores the nature of NESS phase transitions (PTs) in a two-dimensional (2D) ferromagnetic Ising model on a square lattice under effective interactions using Monte Carlo (MC) algorithms. It requires extensive MC simulations using the modified Metropolis and Glauber update rules. Using an appropriate definition of an effective parameter h helps to qualify the modified update rules. For

|
h

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1

, the analytical solution shows that the nature of the PT (including the critical temperature) is independent of h. Furthermore, for

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1
<
h
<
1

, we study the steady-state properties of PTs using numerical methods. Therefore, we performed simulations for different lattice sizes and measured relevant physical quantities. From the data, we determined the numerical results of the transition temperature and relevant critical exponents for various values of h by applying finite-size scaling (FSS). We found that the FSS analysis of the exponents is consistent with the analytical values of the equilibrium 2D Ising model.
Lipid nanoparticles: a sustainable solution for crop disease management
Authors: Pathak Abhishek , Mandal Neetesh , Upadhyaya Devanshi Chandel , Joshi Neha , Upadhyaya Chandrama Prakash 
Published: August 2024

Abstract
The global challenge of achieving sustainable agricultural productivity and ensuring food security is exacerbated by the threat of phytopathogens and pests, which cause substantial damage and result in annual production losses of approximately 20%–40%, amounting to around 40 billion US dollars worldwide. Current reliance on conventional pesticides for crop disease management not only poses risks to human, animal, and environmental health but also contributes to the development of resistant pathogens. In response to this pressing issue, innovative technologies utilizing nanomaterials offer a promising alternative. These nanomaterials including lipid based nanoparticles (LNPs) can encapsulate and deliver pesticidal active ingredients in a controlled and targeted manner, presenting opportunities to enhance efficacy and efficiency while minimizing environmental impact. This approach represents a crucial step towards sustainable agriculture, preserving agro-ecosystem resilience and ensuring global food security. This review aims to provide an overview of the current state of knowledge regarding the use of LNPs in agriculture, with a focus on their applications for crop disease management.
Specifying and Testing the Critical Time Intervention Model
Authors: Herman Daniel B , Susser Ezra S , Conover Sarah A , Valencia Elie 
Published: August 2024

Abstract
This chapter describes the rationale, initial specification, and testing of Critical Time Intervention (CTI) in two randomized trials with unhoused men and women following discharge from institutional settings in New York. Through a decade of work in the nascent homelessness services sector, the authors observed that while considerable attention had so far rightfully focused on designing innovative outreach approaches intended to successfully engage homeless persons on the streets and shelters, few focused systematically on the transition to community care. While engagement and treatment programs must effectively build close, trusting relationships with clients, this often leads to clients depending on program staff to meet a wide range of needs. In contrast, the transition process must help clients move toward greater autonomy and reliance on other sources of support in the community. This underdeveloped stage of service delivery became the focus of the new CTI model.
Model Description
Authors: Herman Daniel B , Susser Ezra S , Conover Sarah A 
Published: August 2024

Abstract
Critical Time Intervention (CTI) is a time-limited, evidence-based model of care coordination for vulnerable people during a critical period of transition in their lives. The aim is to facilitate community integration and continuity of support by helping clients to build enduring ties to their community and support systems during this critical time. As clients are adjusting to their new situation, the CTI team mobilizes and strengthens a network of resources that are meant to endure after CTI ends. The composition of CTI teams can vary, but they almost always include a CTI worker (or occasionally a pair of workers) who has the primary relationship with the client. It is a phase-based model that specifies for each phase the essential tasks that will help clients successfully navigate the “transitioning” process. By the end of the intervention, clients should have the skills and resources they need to support their progress toward recovery.
Toward a Conceptual Framework for Critical and Time-Sensitive Interventions
Authors: Mandiberg James M , Herman Daniel B , Susser Ezra S 
Published: August 2024

Abstract
Since the original development of Critical Time Intervention (CTI), thinking evolved as further experience and knowledge about the timing of interventions accrued. Together with others, the authors have sought to develop a more general conceptual framework about time-specific interventions. In this chapter, they put forth a tentative schema that represents their current thinking. First, they briefly consider the complexity of seemingly simple concepts of developmental stages and sensitive windows for development and their implications for social interventions. They also differentiate CTIs from time-sensitive interventions. Next, they argue that current trends in human services systems have greatly increased the need for time-sensitive interventions. Finally, they present an organizational context for time-sensitive interventions based upon issues of coordinated care and discuss the use of CTI and other time-sensitive and sequenced interventions in a range of human service contexts.
The Puzzle of One Law and Three Formulations
Authors: Zinkin Melissa 
Published: August 2024

Abstract
This chapter discusses the following puzzle: on the one hand, Kant writes in Groundwork II that there is only a single categorical imperative, but, on the other hand, he provides three formulations of this imperative. It argues that the three formulas correspond to the three logical principles of reason that Kant discusses in the Appendix to the first Critique, which constitute a systematic unity: homogeneity, specification, and continuity. Kant writes that the difference among the three formulas is “subjectively rather than objectively practical,” and this difference, therefore, has a practical function with regard to subjectively motivating us to act. This is why Kant says that the three formulations together bring an idea of reason “closer to . . . feeling.” By “feeling,” Kant is referring to his discussion in the Metaphysics of Morals of “the mind’s receptivity to duty as such”: moral feeling, conscience, self-respect, and love of human beings.
Autonomy and the Kingdom of Ends
Authors: Zinkin Melissa 
Published: August 2024

Abstract
This chapter discusses Kant’s Formula of Autonomy and argues that what it means to “comprehend the maxims of one’s choice as a universal law in the same willing” is to think through one’s maxim for oneself in order to comprehend what in it can be made universal. To be autonomous is thus to self-legislate in the sense that one makes the objective moral law one’s own subjective law. It is to have a deep conviction that what one is doing is right and to have self-respect. This chapter also argues that to be member in the Kingdom of Ends is to comprehend that what is most deep about my own particular self is also what is universal for all rational beings and what makes me feel solidarity with them: systematic rational thought. In this way, the feeling of the mind’s receptivity to duty is “love of human beings.”
Conclusion
Authors: Zinkin Melissa 
Published: August 2024

Abstract
The conclusion connects the first and second parts of the book. Once we see that for Kant reason is the faculty of systematic cognition, we can see the importance of the Critique of the Power of Judgment for Kant’s overall philosophical system. Our capacity for systematic judgment, be it theoretical or practical, is what is the “unity of reason,” and is the source of our humanity. The conclusion discusses the role that the humanities play in cultivating our humanity by presenting us with objects that we find to be deep and which make us think, such as objects of wonder.
Consequences
Authors: Toft Monica Duffy 
Published: August 2024

Abstract
Civil wars are devastating. Ten times more people have died in civil wars than interstate conflicts since the end of the Cold War in 1991. While the effects vary from civil war to civil war, the damage is deleterious to countries and the people living in them. But these are just the immediate consequences of civil wars, as there are also long-lasting effects that can plague countries and people for years after the fighting officially stops. Old rivalries and longstanding problems don’t magically end when one side wins or a temporary truce or compromise peace agreement are reached.
The past, present, and future of civil wars
Authors: Toft Monica Duffy 
Published: August 2024

Abstract
A lot has been learned about civil wars in the last several decades. Once scholars and policy-makers turned their attention away from the Cold War and the strategies for avoiding nuclear war between great powers, research on civil wars gained momentum. There now is a pretty good understanding of the common risk factors for war and how and why wars start. While there is a decent appreciation for where civil wars are possible, even likely, policy-makers are not very good at predicting when a new civil war will begin with any precision. There are simply too many factors to consider and insufficient knowledge about unique local settings, situations, and individuals to be as accurate as policy-makers would like. Deeper understandings of countries, cultures, and identities should inform future scholarship.
Icon and iconoclast
Authors: Clark Heather 
Published: August 2024

Abstract
This chapter introduces Sylvia Plath, who is the best-known American woman poet of the 20th century. It explains that her poems and fiction, such as her 1963 novel The Bell Jar, Journal, and Letters, are widely taught in high schools and universities across the English-speaking world. Thus, her name is regularly invoked in popular culture as a reference for rebellion, feminism, and depression. The chapter highlights Plath’s representations of gender and power before considering the notion of confessionalism, politics, and madness within her works. It discusses how biographers often misrepresent Plath’s mental illness, which harmed her legacy by reducing Plath to a “mad” poet.