Results 11 to 20 of about 11,222,712 (216)

Improved Conflict Detection for Graph Transformation with Attributes [PDF]

Electronic Proceedings in Theoretical Computer Science, 2015
In graph transformation, a conflict describes a situation where two alternative transformations cannot be arbitrarily serialized. When enriching graphs with attributes, existing conflict detection techniques typically report a conflict whenever at least ...
Géza Kulcsár, Frederik Deckwerth, Malte Lochau, Gergely Varró, Andy Schürr   +4 more
doaj   +1 more source

Development of an Interference Filter-Stabilized External-Cavity Diode Laser for Space Applications

Photonics, 2020
The National Time Service Center of China is developing a compact, highly stable, 698 nm external-cavity diode laser (ECDL) for dedicated use in a space strontium optical clock. This article presents the optical design, structural design, and preliminary
Linbo Zhang, Tao Liu, Long Chen, Guanjun Xu, Chenhui Jiang, Jun Liu, Shougang Zhang   +6 more
doaj   +1 more source

Experimental Observation of the Suppression of the Dephasing in a Floquet Engineering Optical Lattice Clock

Applied Sciences, 2022
Accurately manipulating quantum states is a fundamental strategy for improving the performance of quantum metrology, computing, and simulation. However, the quantum state is susceptible to dephasing due to the temperature and density of the atomic ...
Feng Guo, Xiaotong Lu, Chihua Zhou, Hong Chang   +3 more
doaj   +1 more source

An Evaluation of the Zeeman Shift of the ⁸⁷Sr Optical Lattice Clock at the National Time Service Center

Applied Sciences, 2020
The Zeeman shift plays an important role in the evaluation of optical lattice clocks since a strong bias magnetic field is applied for departing Zeeman sublevels and defining a quantization axis.
Xiaotong Lu, Mojuan Yin, Ting Li, Yebing Wang, Hong Chang   +4 more
doaj   +1 more source

A Quantum-Based Microwave Magnetic Field Sensor

Sensors, 2018
In this paper, a quantum-based method for measuring the microwave magnetic field in free space is presented by exploring atomic Rabi resonance in the clock transition of 133Cs.
Hao Shi, Jie Ma, Xiaofeng Li, Jie Liu, Chao Li, Shougang Zhang   +5 more
doaj   +1 more source

Recover the abnormal positioning, velocity and timing services caused by BDS satellite orbital maneuvers

Satellite Navigation, 2021
The BeiDou Navigation Satellite System (BDS) provides global Positioning, Velocity, And Timing (PVT) services that are widely used in various areas. The BDS satellites frequently need the orbit maneuvers due to various perturbations to keep satellites in
Rui Tu, Rui Zhang, Pengfei Zhang, Junqiang Han, Lihong Fan, Xiaochun Lu   +5 more
doaj   +1 more source

382 mW External-Cavity Frequency Doubling 461 nm Laser Based on Quasi-Phase Matching

Photonics, 2023
To rapidly improve strontium optical clocks, a high-power, high-efficiency, and high-beam-quality 461 nm laser is required. In blue lasers based on periodically poled KTiOPO4 crystals, the optical absorption in the crystals can induce thermal effects ...
Yingxin Chen, Guodong Zhao, Wei Tan, Hong Chang   +3 more
doaj   +1 more source

Identitetskjemper – om samansette identitetar i vikingtid sett gjennom eit forteljande gravmaterial frå Sogn og Fjordane

Primitive Tider
This paper has provided an overview over the Viking Age burials containing textile- and cooking equipment, such as spindlewhorls, woolcombs, weaver`s baton, frying pans and loom weights in combination with weapons.
Lillian Time
doaj   +1 more source

Sustainable Urban Drainage Systems: Themes of Public Perception—A Case Study

Land, 2022
Climate adaptation measures address the challenges that densification and climate change impose on the urban environment. Sustainable urban drainage system (SUDS) constructs include the introduction of natural elements, such as riparian buffers ...
Bridget Thodesen, Berit Time, Tore Kvande   +2 more
doaj   +1 more source

Solid Pseudopapillary Neoplasm of the Pancreas in Children and Adolescents: Expert Recommendations

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Solid pseudopapillary neoplasm of the pancreas (SPN) is a rare low‐grade malignant exocrine pancreatic tumor, mostly discovered during the second decade of life in females, with a very good prognosis, provided microscopically complete surgical excision is achieved.
Sabine Irtan, Michael Abele, Calogero Virgone, Michaela Kuhlen, Ricardo Lopez‐Almarez, Tal Ben‐Ami, Ewa Bien, Maja Cesen, Malgorzata A. Krawczyk, Andrea Ferrari, Gianni Bisogno, Yves Reguerre, Dominik T. Schneider, Louise Galmiche, Jorg Fuchs, Sarah Braungart, Bilgehan Yalcin, Ines B. Brecht, Daniel Orbach   +18 more
wiley   +1 more source