Results 41 to 50 of about 449 (191)

Effect of aluminum particle size on agglomeration size and burning rate of composite propellant

Journal of Thermal Science and Technology, 2022
An experimental investigation on effects of aluminum particle size on the combustion characteristics of aluminized composite propellant was performed. Reducing the agglomeration size on the burning surface is important to reduce slag in the solid rocket ...
Apollo B. FUKUCHI
doaj   +1 more source

Beyond Earth: Resilience of Quasi‐2D Perovskite Solar Cells in Space

Advanced Materials, EarlyView.
In the article (DOI: 10.1002/adma.202520433), Christoph Putz and co‐workers demonstrate rigid quasi‐2D perovskite solar cells operating in low Earth orbit, delivering stable power for more than 100 days under real‐space conditions. In‐orbit performance is correlated with extensive ground‐based thermal and proton‐irradiation studies on rigid and ...
Christoph Putz, Lukas E. Lehner, Stepan Demchyshyn, Bekele Hailegnaw, Phillip Jahelka, Magdalena Breitwieser, Sercan Özen, Andrea Denker, Jürgen Bundesmann, Alina Hanna Dittwald, Dilara Karabulut, Philipp Tockhorn, Steve Albrecht, Felix Lang, Markus C. Scharber, Michael D. Kelzenberg, Harry A. Atwater, Martin Kaltenbrunner   +17 more
wiley   +1 more source

Study on peristaltic continuous mixing conveyor for composite propellant slurry mixing

Nihon Kikai Gakkai ronbunshu, 2017
In recent years, the demand for rocket launching has increased due to the development of space technology. However, using inexpensive rockets is not always possible.
Yasuyuki YAMADA, Shun YOSHIHAMA, Akihiro IWASAKI, Kyota ASHIGAKI, Kotaro MATUMOTO, Hiroto HABU, Taro NAKAMURA   +6 more
doaj   +1 more source

REINFORCEMENT OF COMPOSITE ROCKET PROPELLANTS BY COTTON AND NITROCELLULOSE FIBRES [PDF]

International Conference on Aerospace Sciences and Aviation Technology, 1997
The Egyptian extra long stapled cotton "GIZA76" which has a very good mechanical and chemical properties [I] was selected as a raw material to obtain nitrocellulose energetic fibres, such fibres can be used as a reinforcing agent in propellant formulations instead of inert fibres to improve not oniy the mechanical properties of composite propellants ...
H. MOSTAFA, S. HASSANIEN, M. RADWAN, M. SADEK   +3 more
openaire   +1 more source

Cross‐Scale Hierarchical Targeted Delivery System Based on Small‐Scale Magnetic Robots

Advanced Robotics Research, EarlyView.
This article reviews a cross‐scale hierarchical targeted delivery system that integrates magnetic continuum robots and magnetic microrobots. By combining rapid long‐range navigation with precise microscale targeting, the system overcomes key limitations of single‐scale approaches.
Junjian Zhou, Zhiqiang Chen, Yuanbiao Ma, Zhiqiang Tang, Qianqian Wang   +4 more
wiley   +1 more source

A Coupled Heat Transfer Calculation Strategy for Composite Cooling Liquid Rocket Engine

Aerospace, 2023
To better understand the characteristics of coupled heat transfer in liquid rocket engines, a calculation scheme is proposed in this paper. This scheme can simulate the coupled heat transfer processes, including combustion and flow in the thrust chamber,
Bo Xu, Bing Chen, Jian Peng, Wenyuan Zhou, Xu Xu   +4 more
doaj   +1 more source

Young people's occupational aspirations beyond the aspiration discourse: A sociocultural perspective

British Educational Research Journal, EarlyView.
Abstract Young people's aspirations have been the focus of many educational, sociological and psychological studies. This paper argues, firstly, that the concept of aspirations holds greater generative potential than suggested by the policy‐oriented ‘aspiration discourse’.
Jelena Popov
wiley   +1 more source

Efeito da concentração do catalisador acetilacetonato férrico na cura de poliuretano à base de polibutadieno líquido hidroxilado (PBLH) e diisocianato de isoforona (IPDI) Effect of ferric acetylacetonate catalyst concentration on the cure of polyurethane based on hydroxy terminated polybutadiene and isophorone diisocyanate

Química Nova, 2002
The reaction between hydroxy-terminated polybutadiene and isophorone diisocyanate constitutes the base of the curing process of the most composite solid propellant used in the propulsion of solid rocket propellant.
Willian César Paterlini, Edson Cocchieri Botelho, Luís Cláudio Rezende, Vera Lucia Lourenço, Mirabel Cerqueira Rezende   +4 more
doaj   +1 more source

Thermal decomposition reaction mechanism and combustion performance of AlH3/AP energetic composite

Case Studies in Thermal Engineering, 2022
To study the reaction mechanism and the optimal energy release ratio of the AlH3/AP energetic composite particles, we prepared six different AlH3/AP energetic composites by wet-mixing after the ultrafine treatment of AP by a jet refiner based on the ...
Minjie Li, Chenyang Li, Yu Song, Chunyan Li, Wangjian Cheng, Chuanhao Xu, Ni Yun, Chongwei An   +7 more
doaj   +1 more source

Non‐negative Gaussian estimation of variance components in random effects models

Canadian Journal of Statistics, EarlyView.
Abstract When used to estimate variance components (VCs), confidence intervals (CIs) can be truncated at zero, have a point estimate not in the quoted CI, be empty with positive probability, or be all‐inclusive. This is because they have conflicting dual roles, since they are considered to cover the parameter with a specified probability while also ...
André Plante, Michael Plante
wiley   +1 more source