Results 161 to 170 of about 89,512 (318)

Reading rate in Polish – Research on Polish Native Speakers and Foreigners Learning Polish

open access: yes
This paper discusses the topic of reading rate, reading comprehension, and overall reading fluency in Polish. The study aims to address several key questions, including: What are the typical reading rate and expected level of comprehension among Polish high school graduates? How about Polish eighth-year primary school students?
openaire   +2 more sources

Float polishing of diffractive optical components

open access: yes, 2010
碩士繞射元件因表面結構複雜一般在精密加工成形後其表面粗糙度便難以改進。本論文以浮動拋光法為基礎研發非接觸式之精密拋光系統用以改善繞射元件的表面粗糙度,並減少拋光過程中對繞射元件表面結構的形狀精度損失。除研製特殊之拋光系統外亦探討各項拋光參數如工件與拋光具間的間隙、工件與拋光具的相對速度、磨粒的尺寸、拋光具的種類等對於繞射元件的表面粗糙度改善與結構形貌變化之相對關係。根據研究結果顯示,本研究開發之拋光系統能夠成功降低繞射元件之表面粗糙度,且與接觸式拋光方法相較 ...
陳運正; Chen, Yun-cheng
core  

In Situ Micromechanical Study of Bimodal γ′–γ″ Precipitate Assemblies in Ni–Cr–Al–Nb Superalloy

open access: yesAdvanced Engineering Materials, EarlyView.
A Ni–Cr–Al–Nb superalloy with a bimodal γ′–γ″ precipitate distribution is developed. Composite precipitate assemblies form through heterogeneous nucleation, effectively impeding dislocation motion. Micropillar compression reveals high strength at room and elevated temperatures, governed by precipitate shearing, with coupled faulting mechanisms ...
Ujjval Bansal   +4 more
wiley   +1 more source

Electrochemical Behavior of Flame‐Sprayed Sc‐Doped AlCoCrFeMo High‐Entropy Alloy Coatings in 3.5% Sodium Chloride Solution

open access: yesAdvanced Engineering Materials, EarlyView.
Scandium (Sc)‐doped AlCoCrFeMo HEA coatings are fabricated via flame spraying with 0.1, 0.3, and 0.5 wt% Sc additions. Among these, the HEA‐Sc0.3 coating exhibits the highest corrosion resistance, indicated by a more positive corrosion potential and lower current density.
Pankaj Kumar   +7 more
wiley   +1 more source

Nondestructive Testing of Welded Composite Metal Foams

open access: yesAdvanced Engineering Materials, EarlyView.
X‐ray computed tomography (CT) is used to evaluate welded steel–steel composite metal foam (CMF) joints of two density classes. It reports variation in postweld spatial void distribution and correlates it to weld‐induced changes, mechanical performance, and failure within welded CMF panels.
Chinmaya Prerana Inguva   +2 more
wiley   +1 more source

Influence of Surface Finish on the Tribological Performance of AlTiBN Coatings Deposited on Forming Tools

open access: yesAdvanced Engineering Materials, EarlyView.
Aluminum and nitride coatings are used in industry because they are hard, resist wear, and protect against oxidation. Adding boron can improve friction behavior and other properties. This study tests coatings on surfaces with different finishes. Results show smoother surfaces perform better, while rough ones wear faster, although coatings can reduce ...
Adrián Claver   +9 more
wiley   +1 more source

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