Results 51 to 60 of about 192,183 (136)

The Relativistic Generalization of the Gravitational Force for Arbitrary Spacetimes [PDF]

, 2007
It has been suggested that re-expressing relativity in terms of forces could provide fresh insights. The formalism developed for this purpose only applied to static, or conformally static, space-times. Here we extend it to arbitrary space-times.
A. Qadir, A. Qadir, Asghar Qadir, C. W. Misner, M. A. Abramowicz, M. Sharif, O. Gron, S. M. Mahajan, S. W. Hawking, S. Weinberg   +9 more
core   +2 more sources

Effects of post-heat treatments on the microstructure and mechanical properties of Ti–6Al–4V alloy fabricated by selective laser melting

Journal of Materials Research and Technology
In this study, post-heat treatments were applied to Ti–6Al–4V (TC4) alloy fabricated by selective laser melting (SLM) to investigate the effects of annealing temperature (750–950 °C in 50 °C intervals) on the alloy's microstructure, residual stress and ...
Yuantao Zhao, Yongkang Yue, Wenlong Deng, Jiansheng Li, Ming Chen, Shenqiang Liu, Wenge Li, Yanbo Liu, Vincent Ji   +8 more
doaj   +1 more source

CO₂ Corrosion of Downhole Sand Control Screen: Experiments, Model, and Application

Energies
Under simulated conditions typical of a high-temperature, high-pressure (HTHP) oil and gas reservoir in the South China Sea, dynamic corrosion evaluation experiments were performed on a three-layer screen structure and three types of sand retaining media.
Bo Zhou, Changyin Dong, Xiaobo Li, Haobin Bai, Bin Yin, Huaiwen Li, Kaixiang Shen   +6 more
doaj   +1 more source

Microphysical Characteristics of Melting Layers in North China Revealed by Aircraft and Radar

Remote Sensing
The microphysical processes within the melting layer (ML) of stratiform clouds have been understudied, particularly regarding their intricate properties and behaviors.
Xiangfeng Hu, Shaoyu Hou, Jiefang Yang, Shuwen Zhao, Xiaorui Zhang, Yue Tao, Hongyu Li, Xiaotuo Zhang, Hao Huang   +8 more
doaj   +1 more source

Automated syringe sampler [PDF]

, 1981
A number of sampling services are disposed in a rack which slides into a housing. In response to a signal from an antenna, the circutry elements are activated which provide power individually, collectively, or selectively to a servomechanism thereby ...
Purgold, G. C.
core   +1 more source

Effect of BaO Content on the Photoluminescence Properties of Mn²⁺ and Eu²⁺-Codoped Sr_3−xBa_xMgSi₂O₈ Phosphors

Inorganics
In this study, Mn2+ and Eu2+-codoped Sr3−xBaxMgSi2O8 (x = 0–1.5) phosphors were synthesized at 1400 °C under a reducing atmosphere composed of 5% H2 and 95% N2 to produce materials with blue light emission.
Shu-Han Liao, Fang-Tzu Hsu, Cheng-Fu Yang, Kao-Wei Min   +3 more
doaj   +1 more source

Plasma structuring within an expanded polar cap and cusp studied with the SS-520-3 sounding rocket

Earth, Planets and Space
The SS-520-3 sounding rocket was launched on November 4th, 2021 as part of the Grand Challenge Initiative - Cusp from Ny-Ålesund, Svalbard. The rocket was launched into the cusp ionosphere during the main phase of a geomagnetic storm.
L. M. Buschmann, K. Asamura, L. B. N. Clausen, Y. Jin, H. Kojima, A. Kumamoto, S. Kurita, Y. Ogawa, K. Oksavik, Y. Saito, A. Spicher, S. Yokota, W. J. Miloch   +12 more
doaj   +1 more source

Effect of heating temperature on the hydrogen embrittlement susceptibility in hot stamped medium-Mn steel

工程科学学报
Medium-Mn steel with M3 microstructural characteristics (multiphase, multiscale, and metastable) is a promising third-generation automotive steel owing to its remarkable combination of ultrahigh strength and ductility.
Xiaoli ZHAO, Yongjian ZHANG, Cunyu WANG, Weijun HUI   +3 more
doaj   +1 more source

Molecular dynamic simulation of a homogeneous bcc -> hcp transition

, 2001
We have performed molecular dynamic simulations of a Martensitic bcc->hcp transformation in a homogeneous system. The system evolves into three Martensitic variants, sharing a common nearest neighbor vector along a bcc direction, plus an fcc region ...
A. Heiming, A. Heiming, B.I. Halperin, B.L. Zhang, D.T. Keating, F. Güthoff, G.S. Bales, H.E. Cook, J. R. Morris, J. Trampenau, J.A. Krumhansl, J.A. Krumhansl, J.D. Axe, J.R. Morris, J.R. Morris, J.R. Morris, K. M. Ho, M. Bulenda, N. W. Ashcroft, P.-A. Lindgard, S.C. Moss, U. Pinsook, U. Pinsook, U. Pinsook, W. Lin, W. Petry, W.C. Kerr, W.G. Burgers, Y. Noda, Yu.N. Gornostyrev, Yu.N. Gornostyrev, Yu.N. Gornostyrev, Z. Nishiyama   +32 more
core   +1 more source

A comparative study on the InterPulse TIG repairing of Inconel 738 alloy using Inconel 625 and Pmet 838 feeding wires

Materials Research Express
Repairing is considered as a practical and economic scheme to effectively extend the lifetime of components made of Inconel 738 (IN 738), which has been widely used in hot sections of jet engines and industrial gas turbines.
Sixiang Zhao, Ping Deng, Lin Yang, Xingdong Chen   +3 more
doaj   +1 more source