Results 41 to 50 of about 1,136,478 (300)

Theory of superfast fronts of impact ionization in semiconductor structures [PDF]

, 2007
We present an analytical theory for impact ionization fronts in reversely biased p^{+}-n-n^{+} structures. The front propagates into a depleted n base with a velocity that exceeds the saturated drift velocity. The front passage generates a dense electron-
Alferov Zh. I., Alferov Zh. I., Andrey Minarsky, Bazelyan E. M., Bilenko Yu. D., Bilenko Yu. D., D’yakonov M. I., D’yakonov M. I., D’yakonov M. I., D’yakonov M. I., Grekhov I. V., Grekhov I. V., Grekhov I. V., Grekhov I. V., Grekhov I. V., Grekhov I. V., Grekhov I. V., Grekhov I. V., Igor Grekhov, Kardo-Susoev A. F., Kardo-Susoev A. F., Levinstein M. E., Meek J. M., Pavel Rodin, Sze S. M., Ute Ebert   +25 more
core   +3 more sources

Velocity equation for grenades while impacting on dry sand media

Defence Technology
This paper deals with the collision of sphere shape grenades with sand media. The central issue of the article is the establishing of an empirical velocity equation of the grenade while impacting on sand that is used to solve motion equations of the ...
Martin Macko, Xuan Son Bui, Kongsathit Phanthavong, Duc Hung Pham, Van Gion Do, Van Minh Do, Jiri Skala   +6 more
doaj   +1 more source

Microdroplet impact at very high velocity [PDF]

, 2012
Water microdroplet impact at velocities up to 100 m/s for droplet diameters from 12 to 100 um is studied. This parameter range covers the transition from capillary-limited to viscosity-limited spreading of the impacting droplet.
Lohse, Detlef, Sun, Chao, Tagawa, Yoshiyuki, Visser, Claas Willem   +3 more
core   +2 more sources

Study on Rock-Breaking Mechanisms of Multi-Dimensional Impact Cutting Based on PDC Cutter Numerical Simulation

Shiyou jixie, 2023
The development and application of the torsional impact drilling model improve the efficiency of breaking rocks along the wellbore circumference.To enhance the rock-breaking efficiency of the compound impact drilling and the optimal torsional-axial ...
Qi Yue, Liu Gonghui, Li Jun, Zha Chunqing, Tian Yudong, Li Yumei   +5 more
doaj  

Determining particle density using known material Hugeniot curves [PDF]

, 1974
A method is detailed to determine the density of particles wherein the closing velocity is known between the impacting particles and a plate of known material.
Dibattista, J. D.
core   +1 more source

An upstream open reading frame regulates expression of the mitochondrial protein Slm35 and mitophagy flux

FEBS Letters, EarlyView.
This study reveals how the mitochondrial protein Slm35 is regulated in Saccharomyces cerevisiae. The authors identify stress‐responsive DNA elements and two upstream open reading frames (uORFs) in the 5′ untranslated region of SLM35. One uORF restricts translation, and its mutation increases Slm35 protein levels and mitophagy.
Hernán Romo‐Casanueva, Ariann E. Mendoza‐Martínez, P. Abril Medina‐Flores, Carlos Campero‐Basaldua, Alexander DeLuna, Soledad Funes   +5 more
wiley   +1 more source

Rock Breaking Analysis and Process Parameter Optimization of Pneumatic DTH Hammer Bit

Shiyou jixie, 2022
In order to improve the rock-breaking efficiency and penetration ability of pneumatic DTH hammer in hard strata, based on the theory of nonlinear contact dynamics, the ABAQUS software was used to build a piston-pneumatic DTH hammer bit-rock(granite ...
Wang Shenglin, Wei Qinwen, Liu Chengjun, Deng Yinjiang, Zhang Shiming, Xiao Xinyuan   +5 more
doaj  

A Comprehensive Study on the Deformation Behavior of Hadfield Steel Sheets Subjected to the Drop Weight Test: Experimental Study and Finite Element Modeling

Metals, 2018
This work presents the results of experimental and finite element modeling studies of impact behavior on the response of a high content of manganese steel blanks with a 1.2 mm thickness of sheets, known also commercially as Hadfield steel (an austenitic ...
Halil Murat Enginsoy, Emin Bayraktar, Ali Kurşun   +2 more
doaj   +1 more source

Design and Analysis of the Capacitive RF MEMS Switches with Support Pillars

Sensors, 2022
Conventional parallel capacitive RF MEMS switches have a large impact during the suction phase. In general, RF MEMS switches have to be switched on and off in a considerably fast manner.
Hongbo Feng, Jiabin Zhao, Chengsi Zhou, Mingxin Song   +3 more
doaj   +1 more source

Two-fluid tokamak equilibria with reversed magnetic shear and sheared flow

, 2005
The aim of the present work is to investigate tokamak equilibria with reversed magnetic shear and sheared flow, which may play a role in the formation of internal transport barriers (ITBs), within the framework of two-fluid model.
G. N. THROUMOULOPOULOS, G. POULIPOULIS, H. TASSO, Wolfram   +3 more
core   +1 more source