Results 51 to 60 of about 860,603 (418)
Cubulating Drilled bundles over graphs [PDF]
arXiv, 2023 We start with a Gromov-hyperbolic surface bundle $E$ over a graph, and drill out essential simple closed curves from fibers to obtain a drilled bundle $F$. We prove that for such drilled bundles $F$, the fundamental group $\pi_1(F)$ is relatively hyperbolic with $(\mathbb{Z}\oplus \mathbb{Z})$ peripheral groups. Combining the relative hyperbolicity of $
arxiv
Adaptation of the Winkie Drill for subglacial bedrock sampling
Annals of Glaciology, 2021 The Winkie Drill is an agile, commercially available rock coring system. The U.S. Ice Drilling Program has modified a Winkie Drill for subglacial rock and ice/rock interface coring, as well as drilling and coring access holes through ice.
Grant V. Boeckmann +6 more
doaj +1 more source
Electroplastic cutting influence on power consumption during drilling process [PDF]
, 2016 The aim of this study is to report the use of non-conventional material removal process technique. It was found that electropulses (EPs) assisted drilling process improves the material machinability based on the eletroplastic influence.
González Rojas, Hernan Alberto +3 more
core +2 more sources
Natural Gas Industry B, 2015 Fractured carbonate reservoirs are susceptible to blowout and lost circulation during drilling, which not only restricts drilling speed, but also poses big threat to well control.
Ling Yan, Huisheng Wu, Yan Yan
doaj +1 more source
Abundance analysis of cool extreme helium star: LSS 3378
, 2006 Abundance analysis of the cool extreme helium (EHe) star LSS 3378 is presented. The abundance analysis is done using LTE line formation and LTE model atmospheres constructed for EHe stars.
Asplund +17 more
core +2 more sources
A miniature surgical drill using ultrasonic/sonic frequency vibration [PDF]
, 2015 A study is presented of a miniature ultrasonic surgical drill designed for bone biopsy, based on an ultrasonic/sonic drill which converts high frequency to low frequency vibrations through a freely vibrating mass between an ultrasonic transducer-horn and
Li, Li +2 more
core +1 more source
Drilling Burr Minimization by Changing Drill Geometry [PDF]
Materials, 2020 This article presents an attempt to solve the problem of the formation of burrs and drilling caps in the process of drilling in difficult-to-cut materials, specifically in the titanium alloy Ti-6Al-4V. In order to eliminate these phenomena, a chamfer of specific length and angle was made on FANAR drill’s margin.
Emilia Franczyk +2 more
openaire +2 more sources
FEBS Open Bio, EarlyView.Heterologous expression of membrane transporters in cultured cells is essential for functional characterization, but is sometimes limited by low activity. Our study compares the HDAC inhibitors butyrate, VPA and SAHA to enhance transport activity. We propose to replace butyrate by SAHA: it is equally effective, devoid of repulsive odor, costs less, and
Svenja Flögel +4 more
wiley +1 more source
Robot-Assisted Drilling on Curved Surfaces with Haptic Guidance under Adaptive Admittance Control [PDF]
arXiv, 2022 Drilling a hole on a curved surface with a desired angle is prone to failure when done manually, due to the difficulties in drill alignment and also inherent instabilities of the task, potentially causing injury and fatigue to the workers. On the other hand, it can be impractical to fully automate such a task in real manufacturing environments because ...
arxiv
Violent music vs violence and music: Drill rap and violent crime in London [PDF]
arXiv, 2020 The current policy of removing drill music videos from social media platforms such as YouTube remains controversial because it risks conflating the co-occurrence of drill rap and violence with a causal chain of the two. Empirically, we revisit the question of whether there is evidence to support the conjecture that drill music and gang violence are ...
arxiv