Results 21 to 30 of about 7,430 (235)

Problems of the dynamics and the origin of comets [PDF]

Astronomical School’s Report, 2000
We consider some problems concerning the dynamics of comets far from the Sun. In this connection an estimate for the different hypotheses of the comet origin is given.
openaire   +2 more sources

Determination of double- and single-stranded DNA breaks in bovine sperm is predictive of their fertilizing capacity

Journal of Animal Science and Biotechnology, 2022
Background The analysis of chromatin integrity has become an important determinant of sperm quality. In frozen-thawed bovine sperm, neither the sequence of post-thaw injury events nor the dynamics of different types of sperm DNA breaks are well ...
Jordi Ribas-Maynou, Ariadna Delgado-Bermúdez, Yentel Mateo-Otero, Estel Viñolas, Carlos O. Hidalgo, W. Steven Ward, Marc Yeste   +6 more
doaj   +1 more source

Cometary Dynamics—Formation and Evolution of the Oort Cloud

Astronomy
In this review, the formation of the Oort Cloud is illuminated from several aspects. One is the history of the subject with an outline of the fundamental discoveries by Öpik, Oort and Hills. It is argued that the basic reason for judging Oort as the real
Hans Rickman
doaj   +1 more source

InSAR Time Series Analysis of L-Band Data for Understanding Tropical Peatland Degradation and Restoration

Remote Sensing, 2019
In this study, satellite radar observations are employed to reveal spatiotemporal changes in ground surface height of peatlands that have, and have not, undergone restoration in Central Kalimantan, Indonesia.
Zhiwei Zhou, Zhenhong Li, Susan Waldron, Akiko Tanaka   +3 more
doaj   +1 more source

The Dust-to-Gas Ratio, Size Distribution, and Dust Fall-Back Fraction of Comet 67P/Churyumov-Gerasimenko: Inferences From Linking the Optical and Dynamical Properties of the Inner Comae

Frontiers in Physics, 2020
In this work, we present results that simultaneously constrain the dust size distribution, dust-to-gas ratio, fraction of dust re-deposition, and total mass production rates for comet 67P/Churyumov-Gerasimenko.
Raphael Marschall, Johannes Markkanen, Selina-Barbara Gerig, Selina-Barbara Gerig, Olga Pinzón-Rodríguez, Nicolas Thomas, Nicolas Thomas, Jong-Shinn Wu   +7 more
doaj   +1 more source

Mechanically Mutable Matrices: A Hierarchical Investigation of Decellularized Sea Cucumber Collagen as an Adaptable Scaffold Material

Advanced Functional Materials, EarlyView.
Sea cucumber mutable collagenous tissue (MCT) is a remarkable collagen‐based material which can rapidly undergo large changes in stiffness through transiently bound effector proteins. Here, we investigate the hierarchical structure and mechanical response of MCT from Cucumaria frondosa across length scales with a wide range of methods, also exploring ...
Nathalie R. H. Singh, Amy K. Lin, Sabra Rostami, Cameron Hastie, Paul W. Wiseman, Patrick Flammang, Christopher Moraes, Matthew J. Harrington   +7 more
wiley   +1 more source

Realistic Models for the Comet Dynamical Environment [PDF]

AIAA/AAS Astrodynamics Specialist Conference and Exhibit, 2006
An outgassing jet model is presented in support of spacecraft navigation for future missions to comets. The outgassing jet is modelled as an emission cone while the comet is modelled as a uniform density triaxial ellipsoid. The comet’s motion about the Sun is included in the model.
Byram, Sharyl Marie, Scheeres, Daniel J., Combi, Michael R.   +2 more
openaire   +1 more source

Spiro‐Phenothiazine Hole‐Transporting Materials: Unlocking Stability and Scalability in Perovskite Solar Cells

Advanced Materials, EarlyView.
Fluorene‐functionalized spiro‐phenothiazine (PTZ‐Fl) exhibits strong Li+ affinity and thermal stability, enabling a PCE of 25.75% in small‐area cells and 22.07% in 25 cm2 modules. Under ISOS‐L3 conditions, PTZ‐Flbased devices retain over 80% efficiency after 1000 hours, demonstrating superior stability and scalability compared to spiro‐OMeTAD for next ...
Javier Urieta‐Mora, Seung Ju Choi, Jaeki Jeong, Silvia Orecchio, Inés García‐Benito, Manuel Pérez‐Escribano, Joaquín Calbo, Likai Zheng, Minseop Byun, Seyeong Song, Gi‐Hwan Kim, Shaik M. Zakeeruddin, Seog‐Young Yoon, Yimhyun Jo, Agustín Molina‐Ontoria, Enrique Ortí, Nazario Martín, Michael Grätzel   +17 more
wiley   +1 more source

Strain Partitioning and Fault Kinematics in the Northern Qilian Shan (NE Tibet) Determined From Bayesian Inference of Geodetic Data

Geophysical Research Letters
Oblique convergence across the northern Qilian Shan is accommodated by sub‐parallel strike‐slip and thrust faults that ruptured simultaneously in the Mw 8 Gulang earthquake in 1927.
Yingfeng Zhang, Sam Wimpenny, Luca Dal Zilio, Xinjan Shan   +3 more
doaj   +1 more source

Recent Advances in Ferrite‐Based Materials for Biomedical Applications: A Comprehensive Review

Advanced Materials, EarlyView.
Ferrite nanoplatforms are presented as tunable biomedical materials in which synthesis control, cation engineering, defect/morphology regulation, and surface functionalization govern structure–property–bioactivity relationships. These design strategies enable multifunctional applications including MRI contrast, magnetic hyperthermia, targeted drug ...
Pramod D. Mhase, Varsha C. Pujari, Akash V. Fulari, Sunil M. Patange, Sean Li, Danyang Wang, Sagar E. Shirsath   +6 more
wiley   +1 more source