Photoredox/Nickel dual-Catalyzed Regioselective Alkylation of Propargylic Carbonates for Trisubstituted Allenes

2021 ◽  
Author(s):  
Yong-Min Liang ◽  
Zhao-Zhao Zhou ◽  
Xian-Rong Song ◽  
Sha Du ◽  
Ke-Jian Xia ◽  
...  
Keyword(s):  
Direct Approach ◽  
Regioselective Alkylation

Herein, a highly regioselective alkylation of propargylic carbonates for trisubstituted allenes with alkyl 1,4-dihydropyridines derivatives is developed via photoredox/ nickel dual-catalyzed process, which represents the first direct approach to access...

Information and estimation in image processing

1987 ◽  
Vol 45 ◽  
pp. 14-17
Author(s):  
B. Roy Frieden
Keyword(s):  
Image Processing ◽  
Optical System ◽  
Large Amplitude ◽  
Communication Theory ◽  
Image Data ◽  
Direct Approach ◽  
Ill Posed

Despite the skill and determination of electro-optical system designers, the images acquired using their best designs often suffer from blur and noise. The aim of an “image enhancer” such as myself is to improve these poor images, usually by digital means, such that they better resemble the true, “optical object,” input to the system. This problem is notoriously “ill-posed,” i.e. any direct approach at inversion of the image data suffers strongly from the presence of even a small amount of noise in the data. In fact, the fluctuations engendered in neighboring output values tend to be strongly negative-correlated, so that the output spatially oscillates up and down, with large amplitude, about the true object. What can be done about this situation? As we shall see, various concepts taken from statistical communication theory have proven to be of real use in attacking this problem. We offer below a brief summary of these concepts.

Direct Approach for Jugular Paraganglioma by Enlarged Mastoidectomy and Hypotympanotomy without Middle Ear Obliteration

2016 ◽  
Vol 77 (S 02) ◽  
Author(s):  
Kazimierz Niemczyk ◽  
Robert Bartoszewicz ◽  
Krzysztof Morawski ◽  
Izabela Popieluch
Keyword(s):  
Middle Ear ◽  
Direct Approach

Competition Policy and Price Fixing

2013 ◽  
Author(s):  
Louis Kaplow
Keyword(s):  
Competition Policy ◽  
Competition Law ◽  
Direct Approach ◽  
Social Harm ◽  
Systematic Analysis ◽  
Oligopoly Theory ◽  
Different Types ◽  
Error Costs ◽  
Benefits And Costs ◽  
Desirable Behavior

Throughout the world, the rule against price fixing is competition law's most important and least controversial prohibition. Yet there is far less consensus than meets the eye on what constitutes price fixing, and prevalent understandings conflict with the teachings of oligopoly theory that supposedly underlie modern competition policy. This book offers a fresh, in-depth exploration of competition law's horizontal agreement requirement, presents a systematic analysis of how best to address the problem of coordinated oligopolistic price elevation, and compares the resulting direct approach to the orthodox prohibition. The book elaborates the relevant benefits and costs of potential solutions, investigates how coordinated price elevation is best detected in light of the error costs associated with different types of proof, and examines appropriate sanctions. Existing literature devotes remarkably little attention to these key subjects and instead concerns itself with limiting penalties to certain sorts of interfirm communications. Challenging conventional wisdom, the book shows how this circumscribed view is less well grounded in the statutes, principles, and precedents of competition law than is a more direct, functional proscription. More important, by comparison to the communications-based prohibition, the book explains how the direct approach targets situations that involve both greater social harm and less risk of chilling desirable behavior—and is also easier to apply.

scholarly journals Birmingham Intervention Tent Technique (BITT): A Technical Note

2021 ◽  
Author(s):  
R. Rajakulasingam ◽  
J. Kho ◽  
G. Almeer ◽  
C. Azzopardi ◽  
S. L. James ◽  
...  
Keyword(s):  
Technical Note ◽  
Direct Approach ◽  
Biopsy Needle ◽  
Biopsy Technique ◽  
Reproducible Technique

Abstract Objective We describe a novel and safe CT biopsy technique that we have termed the “Birmingham intervention tent technique (BITT).” This technique is ideal for biopsying osseous lesions where a direct approach is not possible due to difficult positioning. Methods The BITT uses a plastic surgical forceps clamp attached at an angle to the biopsy needle, creating a tent shape. The finger rings of the forceps is stabilized on the table. Results In our institution, we have already used the BITT successfully in over 10 cases. Conclusion The BITT is an inexpensive and reproducible technique.

Sign in / Sign up

Export Citation Format

Share Document