347 research outputs found
Synthesis, crystal structure and magnetic properties of two new dicyanamide bridged 2D and 1D complexes of Mn(ii)
No full textTwo new polymeric compounds, [Mn(dca)2(4CN-py)2]n (1) and [Mn(dca)2(bpe)]n (2) where dca = dicyanamide anion, 4CN-py = 4-cyanopyridine and bpe = 1,2-bis(4-pyridyl)ethane, have been synthesised and characterised by X-ray crystallography and low temperature magnetic study. Compound 1 consists of a two-dimensional network of octahedrally coordinated Mn(II) cations bridged by dicyanamide anions. In this compound, the Mn(II) cation is linked by four dca bridging ligands and two monodentate 4CN-py ligands. Compound 2 is an one-dimensional chain of Mn(II) bridged by dca as well as bpe. Each Mn(II) in the chain is octahedrally coordinated by four dca and two bpe ligands. Variable temperature magnetic susceptibility measurements in the temperature range 300–2 K reveal the existence of weak antiferromagnetic interactions in both complexes (J = −0.154 cm−1, g = 2.01 for 1 and J = −1.25 cm−1, g = 2.00 for 2)
The first metamagnetic one-dimensional molecular material with nickel(ii) and end-to-end azido bridges
No full textA novel single azido bridged one-dimensional Ni(II) chain, which represents the first metamagnetic one-dimensional metal–azido system with only end-to-end azido bridges, has been synthesised and characterised by a low temperature magnetic study
A three component fully interlocked 3-D network: crystal structure and magnetic properties
No full textA one-pot reaction of three different components [Cu(II), fumarate dianion and piperazine] leads to the self assembly of a magnetic molecular fully interlocked 3D structure with (4,4) nets formed by equal 2D sheets
Bedside prediction of airway length by measuring upper incisor manubrio-sternal joint length
No full textBackground: Malpositioning of endotracheal tube may lead to serious complications like endobronchial intubation or accidental extubation. Using anatomical measurements for prediction of airway length would be more practical in resource constrained settings.
Materials and Methods: One hundred adult patients of American Society of Anesthesiologists (ASA) grade 1 or 2, without any evidence of difficult airway, were randomly allocated to two cohorts - a model cohort of 70 (50 males) and test cohort of 30 (20 males) subjects. Height, the straight length from the upper incisor to manubrio-sternal joint in fully extended head position (IncManustL), the length from upper incisor to the carina in neutral head position (IncCarinaL), and degree of neck extension were measured in all subjects. Relationship between the two lengths in the model cohort was explored by Pearson′s coefficient (r). Predictions were made for subjects in the test cohort and actual and predicted values assessed for agreement using intra-class correlation coefficient (ICC).
Results: Good agreement was found between IncManustL and IncCarinaL for both male (r = 0.69) and female (r = 0.54) subjects. Multiple regression analysis suggested height to be another significant predictor, unlike age, weight, and neck extension. The gender-specific regression equations were used to predict IncCarinaL for the test cohort. ICC for absolute agreement between the actual and predicted values was 0.723 (95% CI 0.495-0.858).
Conclusions: It is possible to predict airway length in adult Indian subjects by making two simple anatomical measurements, namely stature and incisor manubrio-sternal joint length
IMPROVING SIGNAL-TO-NOISE OF 2D IR SPECTRA USING A HIGH REPETITION RATE LASER SYSTEM.
No full textAuthor Institution: DEPARTMENT OF CHEMISTRY,UNIVERSITY OF WISCONSIN AT MADISON,MADISON,WI-53706We propose to build a 2D IR spectrometer based on a 30 KHz repetition rate laser system(cryo-wyvern,KM Labs) and a mid IR pulse shaper.This new shaper will allow a different waveform to be generated each laser shot.With this system we estimate that we will be able to collect a 2D spectra in less than 0.5 S.This talk will focuss on the laser system and the pulse shaping methodology
Generalized Einstein’s Equations from Wald Entropy
Get PDFWe derive the gravitational equations of motion of general theories of gravity from thermodynamics applied to a local Rindler horizon through any point in spacetime. Specifically, for a given theory of gravity, we substitute the corresponding Wald entropy into the Clausius relation. Our approach works for all diffeomorphism-invariant theories of gravity in which the Lagrangian is a polynomial in the Riemann tensor
Systematic analysis for operability and retrofit of energy systems
No full textThis chapter presents a systematic analysis framework for design operability and retrofit of energy systems. This analysis framework consists of Disruption Scenario Analysis (DSA), Feasible Operating Range Analysis (FORA) and debottlenecking analysis for an energy system design. In the proposed DSA, equipment failure scenarios are examined to determine the operability of an energy system design. Meanwhile, FORA determines the feasible operating range of an energy system, taking into account the interdependency between utilities produced and represents a range of net utility output that can be delivered within design and performance limitations. Such range allows designers to determine whether an operating energy system requires debottlenecking and retrofitting. In the event where debottlenecking of an existing energy system is required, the proposed framework incorporates step-by-step debottlenecking procedures. To illustrate the proposed framework, biomass energy system (BES) design is used as a illustrative case study. In the case study, the BES is analyzed to determine if it would require retrofitting in order to increase its heat production to 1.5 MW. Based on the results from the analysis, it is found that additonal 50% and 100% increase in anaerobic digester and fired-tube boiler capacity respectively are required. This addiotional capacities yield a favorable benefit-cost ratio (BCR) value of 1.95 which indicates that the benefits from increased heat production is greater than the costs of increasing equipment capacities, hence, making this a viable retrofit action.</p
NET 40 Generics Beginner's Guide
No full textThis is a concise, practical guide that will help you learn Generics in .NET, with lots of real world and fun-to-build examples and clear explanations. It is packed with screenshots to aid your understanding of the process. This book is aimed at beginners in Generics. It assumes some working knowledge of C# , but it isn't mandatory. The following would get the most use out of the book: Newbie C# developers struggling with Generics. Experienced C++ and Java Programmers who are migrating to C# and looking for an alternative to other generic frameworks like STL and JCF would find this book handy
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