scholarly journals Sieving di-branched from mono-branched and linear alkanes using ZIF-8: experimental proof and theoretical explanation

2013 ◽  
Vol 15 (22) ◽  
pp. 8795 ◽  
Author(s):  
Alexandre F. P. Ferreira ◽  
Marjo C. Mittelmeijer-Hazeleger ◽  
Miguel Angelo Granato ◽  
Vanessa F. Duarte Martins ◽  
Alírio E. Rodrigues ◽  
...  
Keyword(s):  
Theoretical Explanation ◽  
Experimental Proof ◽  
Linear Alkanes

Non-Plasmonic SERS with Silicon: Is It Really Safe? New Insights into Opto-Thermics of Core/Shell Microbeads

2018 ◽  
Author(s):  
Nicolò Bontempi ◽  
Irene Vassalini ◽  
Stefano Danesi ◽  
Matteo Ferroni ◽  
Paolo Colombi ◽  
...  
Keyword(s):  
Critical Role ◽  
Raman Laser ◽  
Core Shell ◽  
Thermal Coupling ◽  
Melting Points ◽  
Experimental Proof ◽  
Weakly Coupled ◽  
Light Management ◽  
Laser Sources ◽  
First Time

<p>Here we investigate for the first time the opto-thermal behavior of SiO<sub>2</sub>/Si core/shell microbeads (Si-rex) irradiated with three common Raman laser sources (lambda=532, 633, 785 nm) under real working conditions. We obtained an experimental proof of the critical role played by bead size and aggregation in heat and light management, demonstrating that in the case of strong opto-thermal coupling the temperature can exceed that of the melting points of both core and shell components. In addition, we also show that weakly coupled beads can be utilized as stable substrates for plasmon-free SERS experiments.</p>

Increasing Cases of Prison Break in Nigeria: A Theoretical Explanation

2019 ◽  
Vol 9 (10) ◽  
pp. p9413
Author(s):  
Onah Oliver Onyekaneze ◽  
Adenyi Okechukwu Theophilus ◽  
Eneh Maximus Ikenna
Keyword(s):  
Theoretical Explanation

Polarization in the U.S. Congress 1952-2008: A Theoretical Explanation

2010 ◽  
Author(s):  
Stuart Elaine Macdonald ◽  
Nicholas Pyeatt ◽  
George Rabinowitz
Keyword(s):  
Theoretical Explanation ◽  
The U.S

CONCEPTUAL MODEL OF THE SYSTEM OF SPECIAL TYPES OF TECHNICAL SUPPORT

2018 ◽  
pp. 135-139
Author(s):  
A. N. Mironov ◽  
V. V. Lisitskiy
Keyword(s):  
Conceptual Model ◽  
System Approach ◽  
Warning System ◽  
Theoretical Explanation ◽  
Technical Support ◽  
Technical System ◽  
The Other ◽  
Alert System ◽  
Empirical Basis ◽  
The Creation

In the article on set-theoretic level, developed a conceptual model of the system of special types of technical support for difficult organizational-technical system. The purpose of conceptualizing the creation of a system of interrelated and stemming from one of the other views on certain objects, phenomena, processes associated with the system of special types of technical support. In the development of applied concepts and principles of the methodology of system approach. The empirical basis for the development of the conceptual model has served many fixed factors obtained in the warning system and require formalization and theoretical explanation. The novelty of the model lies in the account of the effect of environment directly on the alert system. Therefore, in the conceptual model of the system of special types of technical support included directly in the conceptual model of the system of special types and conceptual model of the environment. Part of the conceptual model of the environment is included in the conceptual model of the enemy of nature and co-systems.

Intermolecular hydrogen transfer in unsaturated hydrocarbons induced by dimeric titanocene

1983 ◽  
Vol 48 (10) ◽  
pp. 2924-2936 ◽  
Author(s):  
Karel Mach ◽  
Lidmila Petrusová ◽  
Helena Antropiusová ◽  
Vladimír Hanuš ◽  
František Tureček ◽  
...  
Keyword(s):  
Hydrogen Transfer ◽  
Titanium Content ◽  
Esr Spectra ◽  
Stable Complex ◽  
Catalytic Complex ◽  
Substitution Reactions ◽  
Unsaturated Hydrocarbons ◽  
Linear Alkanes ◽  
Saturated And Aromatic Hydrocarbons ◽  
Intermolecular Hydrogen Transfer

μ-(η5 : η5-Fulvalene)-di-μ-hydrido-bis(η5-cyclopentadienyltitanium) and μ-(η5 : η5-fulvalene)-μ-chloro-μ-hydrido-bis(cyclopentadienyltitanium) form a thermally stable complex which catalyzes the intermolecular hydrogen transfer in unsaturated hydrocarbons, in addition to isomerizations and cyclizations. Cyclic hydrocarbons disproportionate under catalysis to saturated and aromatic hydrocarbons, while linear olefins yield predominantly linear alkanes and high molecular weight tar. The catalyst enables the hydrocarbon system to approach the thermodynamic equilibrium through a series of substitution reactions between alkyl- and allyltitanocene-like species and olefins and dienes. The catalytic complex was characterized by UV and ESR spectra. About one half of overall titanium content could be converted to mononuclear η3-allyltitanocene-like species, stable up to 400 °C. This exceptional thermal stability is ascribed to a firmly bound allyl containing ligand.

The Logic of American Nuclear Strategy

2018 ◽  
Author(s):  
Matthew Kroenig
Keyword(s):  
United States ◽  
National Security ◽  
International Security ◽  
The United States ◽  
Theoretical Explanation ◽  
Security Studies ◽  
Nuclear Deterrence ◽  
Nuclear War ◽  
Nuclear Strategy ◽  
Empirical Record

What kind of nuclear strategy and posture does the United States need to defend itself and its allies? According to conventional wisdom, the answer to this question is straightforward: the United States needs the ability to absorb an enemy nuclear attack and respond with a devastating nuclear counterattack. These arguments are logical and persuasive, but, when compared to the empirical record, they raise an important puzzle. Empirically, we see that the United States has consistently maintained a nuclear posture that is much more robust than a mere second-strike capability. How do we make sense of this contradiction? Scholarly deterrence theory, including Robert Jervis’s seminal book, The Illogic of American Nuclear Strategy, argues that the explanation is simple—policymakers are wrong. This book takes a different approach. Rather than dismiss it as illogical, it explains the logic of American nuclear strategy. It argues that military nuclear advantages above and beyond a secure, second-strike capability can contribute to a state’s national security goals. This is primarily because nuclear advantages reduce a state’s expected cost of nuclear war, increasing its resolve, providing it with coercive bargaining leverage, and enhancing nuclear deterrence. This book provides the first theoretical explanation for why military nuclear advantages translate into geopolitical advantages. In so doing, it resolves one of the most intractable puzzles in international security studies. The book also explains why, in a world of growing dangers, the United States must possess, as President Donald J. Trump declared, a nuclear arsenal “at the top of the pack.”

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