Results 11 to 20 of about 327,042 (281)

2-(1-Methyl-2-oxoindolin-3-ylidene)malononitrile

Acta Crystallographica Section E, 2013
The title molecule, C12H7N3O, is almost planar, with an r.m.s. deviation of 0.026 Å. No directional interactions could be detected in the crystal.
De-Cai Wang, Wei Tang, Peng Su, Ping-Kai Ou-Yang   +3 more
doaj   +1 more source

Experimental Study of Hydraulic Fracture Propagation Behavior during Multistage Fracturing in a Directional Well

Geofluids, 2021
Due to the limited space of offshore platform, it is unable to implement large-scale multistage hydraulic fracturing for the horizontal well in Lufeng offshore oilfield.
Yongtao Zhang, Hao Jin, Bumin Guo, Shoumei Qiu, Peng Yang, Shili Qin, Yantao Xu, Qiang Zhang   +7 more
doaj   +1 more source

Modeling of Creep Deformation Behavior of DZ411 and Finite Element Simulation of Turbine Blade

Metals, 2023
Creep tests were conducted on DZ411 material at 930 °C and 850 °C, and creep curves were recorded and employed in normalization creep model building.
Yihui Liu, Yanrong Wang, Dasheng Wei, Xianghua Jiang, Qiannan Tao   +4 more
doaj   +1 more source

Mirror formation control in the vicinity of an asteroid [PDF]

, 2008
Two strategies are presented for the positioning and control of a spacecraft formation designed to focus sunlight onto a point on the surface of asteroid, thereby sublimating the material and ejecting debris creating thrust.
Battin R. H., Hu W., Kahle R., Lunan D., Maddock C., Melosh H. J., Near Earth Object Program, Rossi A., SanchezCuartielles J.P., Schaub H., Strang G., Vasile M.   +11 more
core   +2 more sources

A New Approach for Accurate Prediction of Liquid Loading of Directional Gas Wells in Transition Flow or Turbulent Flow

Journal of Chemistry, 2017
Current common models for calculating continuous liquid-carrying critical gas velocity are established based on vertical wells and laminar flow without considering the influence of deviation angle and Reynolds number on liquid-carrying. With the increase
Ruiqing Ming, Huiqun He
doaj   +1 more source

Microaneurysms detection in color fundus images using machine learning based on directional local contrast [PDF]

, 2020
BACKGROUND: As one of the major complications of diabetes, diabetic retinopathy (DR) is a leading cause of visual impairment and blindness due to delayed diagnosis and intervention. Microaneurysms appear as the earliest symptom of DR.
Chen, Jiali, Chen, Zhiqing, Hu, Ante, Liu, Haipeng, Long, Shengchun, Zheng, Dingchang   +5 more
core   +1 more source

Analysis of orientation errors in triaxial fluxgate sensors and research on their calibration methods [PDF]

Geoscientific Instrumentation, Methods and Data Systems
Three-axis magnetic flux gate sensors are widely used in Chinese geomagnetic observatories, but due to their directional errors it is necessary to study error correction methods to improve measurement accuracy.
X. Hu, X. Hu, S. He, S. He, X. Zhao, Q. Tian, Q. Tian, A. Mamatemin, P. Guo, P. Guo, G. Chang, G. Chang   +11 more
doaj   +1 more source

From dark to darkness, negative phototropism influences the support-tree location of the massive woody climber Hydrangea serratifolia (Hydrangeaceae) in a Chilean temperate rainforest

Plant Signaling & Behavior, 2022
Climbing plants rely on suitable support to provide the light conditions they require in the canopy. Negative phototropism is a directional search behavior proposed to detect a support-tree, which indicates growth or movement away from light, based on ...
W. David Rodriguez-Quintero, María Moreno-Chacón, Fernando Carrasco-Urra, Alfredo Saldaña   +3 more
doaj   +1 more source

Directivity Modeling and Simulation Analysis of a Novel Structure MEMS Piezoelectric Vector Hydrophone

Micromachines, 2023
In this paper, a novel dual-mass MEMS piezoelectric vector hydrophone is proposed to eliminate the transverse effect and solve the problem of directivity offset in traditional single-mass MEMS piezoelectric vector hydrophones.
Wei Deng, Qingqing Fan, Junhong Li, Chenghao Wang   +3 more
doaj   +1 more source

Crystal structure of N,N′-bis(diisopropylphosphanyl)-4-methylpyridine-2,6-diamine

Acta Crystallographica Section E, 2014
In the molecule of the title compound, C18H35N3P2, the methylpyridine-2,6-diamine moiety is almost planar, with a maximum deviation of 0.0129 (9) Å for one of the amine N atoms.
Berthold Stöger, Matthias Weil, Bernhard Bichler, Wolfgang Eder, Karl Kirchner   +4 more
doaj   +1 more source