308 research outputs found
A microflow electrolysis cell for laboratory synthesis on the multigram scale
No full textA large microflow electrolysis cell for laboratory synthesis on a multigram scale is described. It is based on two circular electrodes with a diameter of 149 mm and a spiral electrolyte flow channel 2000 mm long, 5 mm wide, and 0.5 mm interelectrode gap. Using the methoxylation of N-formylpyrrolidine as a model reaction, it is demonstrated that the cell approaches 100% conversion in a single pass, and it is possible to achieve a reaction selectivity >95% and a product formation rate of >20 g h–1
An extended channel length microflow electrolysis cell for convenient laboratory synthesis
No full textA spiral, extended channel length microflow cell designed for routine and convenient application in an organic synthesis laboratory is described. The performance of the cell is demonstrated using two syntheses and it is shown that high selectivities and high conversions in a single pass can be achieved as well as the formation of products at a rate of up to 25mmol/h (~3 g/h). The cell is also well suited to carrying out the optimisation of reaction conditions with electrolyses completed on a timescale of minutes
Interview with Bashir Omar
No full textهذة المقابلة مع المؤلف بشير عمر، يتحدث عن مؤلفاتة وخاصة كتب الأطفال، كما أشار لمشكلة الكتابة المتعلقة بكتب الأطفال وكيفية حلها.أجرى المقابلة حسن شمس الدين.In this interview, author Bashir Omar (Bashir Umar) speaks about his writings. He also mentions difficulties in writing children's books and how to resolve them. The interview was conducted by Hasan Shams al-Din
Interview with Abd al-Razzaq al-Bashir
No full textهذة المقابلة مع عبد الرزاق البصير الكاتب الكويتي ، وعضو في مجمع اللغة العربية في القاهرة ، يتحدث عن نشأتة وتعليمه. يشير للشعراء المفضلين له، الذين أثروا في شخصيته. ويشير إلى أهمية اللغة العربية في حياته. أجرى المقابلة حسن شمس الدين.In this interview, Kuwaiti author Abd al-Razzaq al-Bashir speaks about his early life and education. He mentions his favorite poets that impacted his life and the importance of the Arabic language. The interview was conducted by Hasan Shams al-Din
First person – Aushaq Bashir Malla
No full textABSTRACT
First Person is a series of interviews with the first authors of a selection of papers published in Journal of Cell Science, helping early-career researchers promote themselves alongside their papers. Aushaq Bashir Malla is co-first author on ‘ IP6K1 is essential for chromatoid body formation and temporal regulation of Tnp2 and Prm2 expression in mouse spermatids’, published in Journal of Cell Science. Aushaq is a PhD student at the Centre for DNA Fingerprinting and Diagnostics, India, investigating the post-transcriptional regulation of mRNA and role of RNA–protein interactions in disease and development.</jats:p
Application of Analog Adaptive Filters for Dynamic Sensor Compensation
No full textThis paper investigates the application of analog adaptive techniques to the area of dynamic sensor compensation, of which there is little reported work in the literature. The case is illustrated by showing how the response of a load cell can be improved to speed up the process of measurement. The load cell is a sensor with an oscillatory output in which the measurand contributes to the response parameters. Thus, a compensation filter needs to track variation in measurand whereas a simple, fixed filter is only valid at one specific load value. To facilitate this investigation, computer models for the load cell and the adaptive compensation filter have been developed. To allow a practical implementation of the adaptive techniques, a novel piecewise linearization technique is proposed in order to vary a floating voltage-controlled resistor in a linear manner over a wide range. Simulation and practical results are presented, thus demonstrating the effectiveness of the proposed techniques
A Fast and Accurate Process Variation-aware Modeling Technique for Resistive Bridge Defects
No full textRecent research has shown that tests generated without taking process variation into account may lead to loss of test quality. At present there is no efficient device-level modeling technique that models the effect of process variation on resistive bridge defects. This paper presents a fast and accurate technique to achieve this, including modeling the effect of voltage and temperature variation using BSIM4 transistor model. To speedup the computation time and without compromising simulation accuracy (achieved through BSIM4) two efficient voltage approximation algorithms are proposed for calculating logic threshold of driven gates and voltages on bridged lines of a fault-site to calculate bridge critical resistance. Experiments are conducted on a 65-nm gate library (for illustration purposes), and results show that on average the proposed modeling technique is more than 53 times faster and in the worst case, error in bridge critical resistance is 2.64% when compared with HSPICE
Replication Data for: Testing Inferences about American Politics: A Review of the "Oligarchy" Result
No full textDataset attached to the original Gilens and Page article (renamed gp_data.dta) and two original-author files that describe it (gp_variables_seeDS1.pdf, gp_codings.pdf). Additionally, five .R files that replicate different parts of the response to the original article. Footnotes in the response paper describe each of the .R files
Replication Data for: Testing Inferences about American Politics: A Review of the "Oligarchy" Result
No full textDataset attached to the original Gilens and Page article (renamed gp_data.dta) and two original-author files that describe it (gp_variables_seeDS1.pdf, gp_codings.pdf). Additionally, five .R files that replicate different parts of the response to the original article. Footnotes in the response paper describe each of the .R files
Low-energy standby-sparing for hard real-time systems
No full textTime-redundancy techniques are commonly used in real-time systems to achieve fault tolerance without incurring high energy overhead. However, reliability requirements of hard real-time systems that are used in safety-critical applications are so stringent that time-redundancy techniques are sometimes unable to achieve them. Standby sparing as a hardware redundancy technique can be used to meet high reliability requirements of safety-critical applications. However, conventional standby-sparing techniques are not suitable for low-energy hard real-time systems as they either impose considerable energy overheads or are not proper for hard timing constraints. In this paper we provide a technique to use standby sparing for hard real-time systems with limited energy budgets. The principal contribution of this work is an online energy management technique which is specifically developed for standby-sparing systems that are used in hard real-time applications. This technique operates at runtime and exploits dynamic slacks to reduce the energy consumption while guaranteeing hard deadlines. We compared the low-energy standby-sparing (LESS) system with a low-energy time redundancy system (from a previous work). The results show that for relaxed time constraints, the LESS system is more reliable and provides about 26% energy saving as compared to the time-redundancy system. For tight deadlines when the time redundancy system is not sufficiently reliable (for safety-critical application), the LESS system preserves its reliability but with about 49% more energy consumptio
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