Results 91 to 100 of about 8,464 (293)

Comet dynamics and implications for orbiting spacecraft

, 2015
May 2015School of EngineeringIn this thesis, a comet model is presented and used to analyze an orbiting spacecraft in the presence of outgassing. Simulations are conducted in an attempt to classify the environment around a comet during different orbital ...
Balsamo, James M.
core  

Application of Non‐Isothermal Network Theory With Curved‐Channel Element Characteristics to Predict Melt Conveying in High‐Performance Single‐Screw Extruders

Journal of Polymer Science, EarlyView.
This study presents a fast and accurate calculation tool to predict conveying of polymer melts in single‐screw extruders. Integrating generalized sub‐models into network theory allows to represent the complex screw shapes and material behavior more realistically. Tests on an industrial extruder show close agreement with experiments, outperforming older
Daniel Herzog, Wolfgang Roland, Christian Marschik, Gerald Berger‐Weber   +3 more
wiley   +1 more source

Comet and asteroid dynamics

, 1991
In order to provide the ground-based observing community and NASA flight projects with accurate comet and asteroids ephemerides, improvements are being made to the existing dynamic models and new data type are being investigated.
Yeomans, Donald K.
core  

The Comet Assay for the Evaluation of Genotoxic Potential of Landfill Leachate

The Scientific World Journal, 2012
Genotoxic assessment of landfill leachate before and after biological treatment was conducted with two human cell lines (Me45 and NHDF) and Daphnia magna somatic cells. The alkali version of comet assay was used to examine genotoxicity of leachate by DNA
Kamila Widziewicz, Joanna Kalka, Magdalena Skonieczna, Paweł Madej   +3 more
doaj   +1 more source

Baicalein Sensitizes Radioresistant BT549 and MCF7‐R Breast Cancer Cells by Modulating Rac1 Signaling

Phytotherapy Research, EarlyView.
ABSTRACT Radioresistance remains a key barrier in breast cancer (BC) treatment. Baicalein, a flavonoid from Scutellaria baicalensis, has shown potential to enhance radiosensitivity. This study investigates its efficacy and mechanism in radioresistant BC models. Radioresistant BC cell models were established via fractionated irradiation and validated by
Zitong Zhao, Zhangyun Li, Quanzhou Peng, Shuqun Zhang   +3 more
wiley   +1 more source

The thrombin receptor (PAR1) is associated with microtubules, mitosis and process formation in glioma cells

Heliyon
The cell surface protease-activated receptor 1 (PAR1) is overexpressed in glioblastoma multiforme (GBM). We studied the function and structure of intracellular microtubule (MT) and PAR1 in a tubulin-mediated process.
Valery Golderman, Shany Guly Gofrit, Yanina Ivashko-Pachima, Illana Gozes, Joab Chapman, Efrat Shavit-Stein   +5 more
doaj   +1 more source

From Flybys to Sample Return: A Review of Space Probes and Robotic Sampling Technologies for Small Bodies

Journal of Field Robotics, EarlyView.
ABSTRACT As a crucial puzzle piece of deep space exploration, exploring small bodies can provide significant scientific insights and valuable mineral resources. Unlike missions to the Moon and Mars, small‐body missions pose distinct technical challenges, including communication delays, weak gravity, and uncertain environments. This paper reviews a full
Xin Zhang, Hao Zhou, Dalin Zhou, Zhaojie Ju   +3 more
wiley   +1 more source

Observations of counter-streaming ions in and around the diamagnetic cavity of comet 67P

Astronomy & Astrophysics
Context. Ion speeds at comet 67P/Churyumov-Gerasimenko significantly exceed local neutral gas speeds, a discrepancy that challenges current ion-neutral coupling models.
Yun X.-T., Stenberg Wieser G., Nilsson H., Bergman S., Fu S., Ni B.   +5 more
doaj   +1 more source

Sampling, Mobility, and Anchoring in Small‐Body Sampling Robots: A Comprehensive Review

SmartBot, EarlyView.
Small‐body sampling robots are exploration systems that perform contact, sampling, and stable operations on microgravity bodies such as asteroids and comets. The authors review representative robot architectures and key technologies, focusing on the mechanisms, evolution, and coupling of sampling, mobility, and anchoring.
Yurui Shen, Yixin Zhu, Mingxia Bao, Ting Zhang, Jun Wu, Jingbin Hao, Dezheng Hua, Xinhua Liu   +7 more
wiley   +1 more source

Structure and dynamics of the umagnetized plasma around comet 67P/CG

, 2016
International audienceAt distances close enough to the Sun, when comets are characterised by a significant outgassing, the cometary neutral density may become large enough for both the cometary plasma and the cometary gas to be coupled, through ion ...
Glassmeier, K. H., Heritier, K. L., Tsurutani, B., Vallières, Xavier, Richter, I., Hajra, R., Gilet, N., Moré, J., Goetz, C., Eriksson, A. I., Galand, M. F., Henri, P., Altwegg, K., Nemeth, Z., Rubin, M.   +14 more
core   +1 more source