scholarly journals Lifting the Lid on the Potentiostat: A Beginners Guide to Understanding Electrochemical Circuitry and Practical Operation

2021 ◽  
Author(s):  
Alex Colburn ◽  
Katharine Levey ◽  
Danny O'Hare ◽  
Julie Macpherson
Keyword(s):  
Reference Electrode ◽  
Data Interpretation ◽  
Face To Face ◽  
Op Amp ◽  
Practical Operation ◽  
Voltage Signal ◽  
Voltage Follower ◽  
Analogue To Digital ◽  
First Time ◽  
A Current

<p></p><p>Students who undertake practical electrochemistry experiments for the first time, will come face to face with the potentiostat. To many this is simply a box containing electronics which enables a potential to be applied between a working and reference electrode, and a current to flow between the working and counter electrode, both of which are outputted to the experimentalist. Given the broad generality of electrochemistry across many disciplines it is these days very common for students entering the field to have a minimal background in electronics. This article serves as an introductory tutorial to those with no formalized training in this area. The reader is introduced to the operational amplifier, which is at the heart of the different potentiostatic electronic circuits and its role in enabling a potential to be applied and a current to be measured is explained. Voltage follower op-amp circuits are also highlighted, given their importance in measuring voltages accurately. We also discuss digital to analogue and analogue to digital conversion, the processes by which the electrochemical cell receives input signals and outputs data and data filtering. By reading the article, it is intended the reader will also gain a greater confidence in problem solving issues that arise with electrochemical cells, for example electrical noise, uncompensated resistance, reaching compliance voltage, signal digitisation and data interpretation. We also include trouble shooting tables that build on the information presented and can be used when undertaking practical electrochemistry.</p><p></p>

scholarly journals Lifting the Lid on the Potentiostat: A Beginners Guide to Understanding Electrochemical Circuitry and Practical Operation

2021 ◽  
Author(s):  
Alex Colburn ◽  
Katharine Levey ◽  
Danny O'Hare ◽  
Julie Macpherson
Keyword(s):  
Reference Electrode ◽  
Data Interpretation ◽  
Face To Face ◽  
Op Amp ◽  
Practical Operation ◽  
Voltage Signal ◽  
Voltage Follower ◽  
Analogue To Digital ◽  
First Time ◽  
A Current

<p></p><p>Students who undertake practical electrochemistry experiments for the first time, will come face to face with the potentiostat. To many this is simply a box containing electronics which enables a potential to be applied between a working and reference electrode, and a current to flow between the working and counter electrode, both of which are outputted to the experimentalist. Given the broad generality of electrochemistry across many disciplines it is these days very common for students entering the field to have a minimal background in electronics. This article serves as an introductory tutorial to those with no formalized training in this area. The reader is introduced to the operational amplifier, which is at the heart of the different potentiostatic electronic circuits and its role in enabling a potential to be applied and a current to be measured is explained. Voltage follower op-amp circuits are also highlighted, given their importance in measuring voltages accurately. We also discuss digital to analogue and analogue to digital conversion, the processes by which the electrochemical cell receives input signals and outputs data and data filtering. By reading the article, it is intended the reader will also gain a greater confidence in problem solving issues that arise with electrochemical cells, for example electrical noise, uncompensated resistance, reaching compliance voltage, signal digitisation and data interpretation. We also include trouble shooting tables that build on the information presented and can be used when undertaking practical electrochemistry.</p><p></p>

scholarly journals Lifting the Lid on the Potentiostat: A Beginners Guide to Understanding Electrochemical Circuitry and Practical Operation

2021 ◽  
Author(s):  
Alex W Colburn ◽  
Katherine J Levey ◽  
Danny O'Hare ◽  
Julie V Macpherson
Keyword(s):  
Face To Face ◽  
Practical Operation ◽  
First Time

Students who undertake practical electrochemistry experiments for the first time, will come face to face with the potentiostat. To many this is simply a box containing electronics which enables a...

PERSPECTIVE DEVELOPMENT OF WORLD PRODUCTION OF FEEDS FOR AQUACULTURE: ALTERNATIVE SOURCES OF RAW MATERIALS

2017 ◽  
pp. 67-78
Author(s):  
Lina Yurievna Lagutkina
Keyword(s):  
Raw Materials ◽  
Limiting Factors ◽  
Current Status ◽  
Feed Production ◽  
The World ◽  
Market Trends ◽  
Alternative Sources ◽  
World Industry ◽  
First Time ◽  
A Current

The author of the article discloses the prospects of development of the world feed production for aquaculture based on the analysis of key innovative technological and market trends. The author specifies that shortage, high cost, low ecological compatibility of traditional raw materials - fish flour - are among major limiting factors in the development of production of feeds for aquaculture. This fact, in turn, limits sustainable development of aquaculture both in Russia, and in the world in general. The article presents the overview of a current status of the world industry of feed production in aquaculture, where the regional situation is studied, as well. For the first time, there is given the outlook of innovative technologies in feed production based on the alternative sources of protein (on the example of projects of leading aquabiotechnological companies) which will determine industry’s objectives for the mid-term perspective.

scholarly journals Nanocrystalline TiO2Electrodes Exhibiting High Storage Capacity and Stability in Rechargeable Lithium Batteries

1995 ◽  
Vol 18 (1) ◽  
pp. 23-30 ◽  
Author(s):  
Sui-Yang Huang ◽  
Ladislav Kavan ◽  
Andreas Kay ◽  
Michael Grätzel ◽  
Ivan Exnar
Keyword(s):  
Current Density ◽  
High Current Density ◽  
Discharge Voltage ◽  
Unit Weight ◽  
Nanocrystalline Films ◽  
Rechargeable Lithium Batteries ◽  
Capacity Loss ◽  
High Storage Capacity ◽  
First Time ◽  
A Current

Nanocrystalline TiO2films were explored for the first time as electrode material for a rechargeable lithium intercalation cell, i.e., Li/LiCF3SO3+ PC/TiO2. Two kinds of nanocrystalline films, TiO2F387 (Degussa) and TiO2colloid-240, were investigated. These films exhibited excellent performance renderings them a promising choice for secondary battery applications. At a current density of 0.01 mA/cm2, two voltage plateaus at 1.78 and 1.89 V were observed for TiO2F387 films during charge and discharge, respectively. The TiO2electrode charge capacity per unit weight rose with decreasing current density. The highest capacity, obtained at a current density of 0.005 mA/cm2and a final discharge voltage of 1.4 V, was 265 mAh/g corresponding to a lithium insertion ratio ofx= 0.8. Nanocrystalline TiO2colloid-240 films showed a similar performance. The cycle life of a TiO2colloid-240 cell at a high current density was found to be excellent; a capacity loss lower than 14% has been observed over 100 charge/discharge cycles.

Fault Detection by Using Instance Segmentation

2021 ◽  
Author(s):  
Donglin Zhu ◽  
Lei Li ◽  
Rui Guo ◽  
Shifan Zhan
Keyword(s):  
Fault Detection ◽  
Seismic Data ◽  
Semantic Segmentation ◽  
Data Interpretation ◽  
Machine Learning Methods ◽  
Segmentation Algorithms ◽  
Direct Recognition ◽  
First Time ◽  
Seismic Images ◽  
Instance Segmentation

Abstract Fault detection is an important, but time-consuming task in seismic data interpretation. Traditionally, seismic attributes, such as coherency (Marfurt et al., 1998) and curvature (Al-Dossary et al., 2006) are used to detect faults. Recently, machine learning methods, such as convolution neural networks (CNNs) are used to detect faults, by applying various semantic segmentation algorithms to the seismic data (Wu et al., 2019). The most used algorithm is U-Net (Ronneberger et al., 2015), which can accurately and efficiently provide probability maps of faults. However, probabilities of faults generated by semantic segmentation algorithms are not sufficient for direct recognition of fault types and reconstruction of fault surfaces. To address this problem, we propose, for the first time, a workflow to use instance segmentation algorithm to detect different fault lines. Specifically, a modified CNN (LaneNet; Neven et al., 2018) is trained using automatically generated synthetic seismic images and corresponding labels. We then test the trained CNN using both synthetic and field collected seismic data. Results indicate that the proposed workflow is accurate and effective at detecting faults.

First-time mothers' experiences of the first stage of labour in hospitals in the HhoHho region, Eswatini

2021 ◽  
Vol 15 (1) ◽  
pp. 1-8
Author(s):  
Nonhlahla Mamba ◽  
Oslinah B Tagutanazvo
Keyword(s):  
Normal Vaginal Delivery ◽  
Hospital Data ◽  
Face To Face ◽  
First Time Mothers ◽  
Open Coding ◽  
Analyse Data ◽  
Labour Pains ◽  
Postpartum Mothers ◽  
First Time ◽  
Purposive Sample

Background/Aims Women have different and varying experiences of labour and their coping strategies vary as well. Having support during labour may help women feel in control of their labour. This study aimed to explore and describe the experiences of first-time mothers during the first stage of labour. Methods The study used a qualitative, exploratory, descriptive design. A purposive sample of nine first-time postpartum mothers were selected to participate following normal vaginal delivery at Mbabane Government Hospital. Data were collected through face-to-face interviews and analysed thematically. Open coding was used to analyse data. Results Four themes emerged: 1. Ignorance of the signs of labour 2. Anxiety related to fear 3. Maintaining adequate nutrition 4. Coping with labour pains. Each theme had several subcategories. Most participants were ignorant of the signs of labour and reported anxiety related to fear of the unknown and practiced different ways of coping with labour pains. Conclusions First-time mothers require adequate preparation for labour, as many women in this study were ignorant of the signs of labour and reported anxiety related to fear of the unknown. Pregnant women should be educated about the physiological aspects of the first stage of labour and oriented in the labour ward during the prenatal period.

Some Origins of Nationalism in East Africa

1968 ◽  
Vol 9 (1) ◽  
pp. 119-146 ◽  
Author(s):  
J. M. Lonsdale
Keyword(s):  
Central Government ◽  
Colonial Period ◽  
Political Activity ◽  
Colonial Rule ◽  
Face To Face ◽  
National Movements ◽  
New Type ◽  
First Time ◽  
Official Recognition

This paper attempts to provide a frame of reference for evaluating the role of ordinary rural Africans in national movements, in the belief that scholarly preoccupation with élites will only partially illumine the mainsprings of nationalism. Kenya has been taken as the main field of enquiry, with contrasts and comparisons drawn from Uganda and Tanganyika. The processes of social change are discussed with a view to establishing that by the end of the colonial period one can talk of peasants rather than tribesmen in some of the more progressive areas. This change entailed a decline in the leadership functions of tribal chiefs who were also the official agents of colonial rule, but did not necessarily mean the firm establishment of a new type of rural leadership. The central part of the paper is taken up with an account of the competition between these older and newer leaderships, for official recognition rather than a mass following. A popular following was one of the conditions for such recognition, but neither really achieved this prior to 1945 except in Kikuyuland, and there the newer leaders did not want official recognition. After 1945 the newer leadership, comprising especially traders and officials of marketing co-operatives, seems everywhere to have won a properly representative position, due mainly to the enforced agrarian changes which brought the peasant face to face with the central government, perhaps for the first time. This confrontation, together with the experience of failure in earlier and more local political activity, resulted in a national revolution coalescing from below, co-ordinated rather than instigated by the educated élite.

Do we need medical leadership or medical engagement?

2015 ◽  
Vol 28 (3) ◽  
pp. 173-184 ◽  
Author(s):  
Peter Spurgeon ◽  
Paul Long ◽  
John Clark ◽  
Frank Daly
Keyword(s):  
Care Quality ◽  
Current Evidence ◽  
Organisational Performance ◽  
Content Type ◽  
Care Quality Commission ◽  
The Uk ◽  
Medical Leadership ◽  
First Time ◽  
Practical Implications ◽  
A Current

Purpose – The purpose of this paper is to address issues of medical leadership within health systems and to clarify the associated conceptual issues, for example, leadership versus management and medical versus clinical leadership. However, its principle contribution is to raise the issue of the purpose or outcome of medical leadership, and, in this respect, it argues that it is to promote medical engagement. Design/methodology/approach – The approach is to provide evidence, both from the literature and empirically, to suggest that enhanced medical engagement leads to improved organisational performance and, in doing so, to review the associated concepts. Findings – Building on current evidence from the UK and Australia, the authors strengthen previous findings that effective medical leadership underpins the effective organisational performance. Research limitations/implications – There is a current imbalance between the size of the databases on medical engagement between the UK (very large) and Australia (small but developing). Practical implications – The authors aim to equip medical leaders with the appropriate skill set to promote and enhance greater medical engagement. The focus of leaders in organisations should be in creating a culture that fosters and supports medical engagement. Social implications – This paper provides empowerment of medical professionals to have greater influence in the running of the organisation in which they deliver care. Originality/value – The paper contains, for the first time, linked performance data from the Care Quality Commission in the UK and from Australia with the new set of medical engagement findings.

scholarly journals Use of Tablet Video for Delivery of Neonatal Discharge Instructions to First-Time Parents

2021 ◽  
Vol 53 (2) ◽  
pp. 145-147
Author(s):  
Kristine L. Cece ◽  
Jane E. Chargot ◽  
Micheleen Hashikawa ◽  
Melissa A. Plegue ◽  
Katherine J. Gold
Keyword(s):  
Randomized Controlled Trial ◽  
Patient Satisfaction ◽  
Controlled Trial ◽  
Patient Perceptions ◽  
Discharge Instructions ◽  
Face To Face ◽  
Randomized Controlled ◽  
Use Of Technology ◽  
Video Group ◽  
First Time

Background and Objectives: While video discharge instructions have been shown to improve retention of information and patient satisfaction, data are limited regarding patient perceptions of video tools. Methods: We conducted a randomized controlled trial to assess self-rated comprehension and overall satisfaction with video versus face-to-face neonatal discharge instructions in first-time mothers. Results: Video instructions were no different from face-to-face instructions, though there was a nonsignificant increase in confidence in caring for their newborn in the video group. Conclusions: Broader use of technology may allow for a more standardized approach to patient education and improve efficiency for clinicians, without compromising patient satisfaction and confidence in caring for themselves and their dependents.

scholarly journals Simulation and performance analysis of Multiple PCS sensors system

2017 ◽  
Vol 20 (2) ◽  
pp. 85
Author(s):  
Pawan Whig ◽  
Syed Naseem Ahmad ◽  
Surinder Kumar
Keyword(s):  
Low Cost ◽  
Reference Electrode ◽  
Oxygen Demand ◽  
High Sensitivity ◽  
Readout Circuit ◽  
Active Components ◽  
Multiple Sensors ◽  
Quality Of Water ◽  
Voltage Signal ◽  
And Performance

In this paper, a novel circuit is presented which overcome a serious limitation found in case of multiple sensors system. In this novel system design only one reference electrode and few active components used that makes the implementation of a low-cost system for the supervision of water quality. Photo Catalytic Sensor (PCS) estimates the parameter BOD (Biological Oxygen Demand) which is generally used to estimate quality of water. The system proposed in this paper involves a balanced bridge approach using few electronic components that provides a correlation in the input-output signals of low-cost sensors. The main reason of employing a readout circuit to PCS circuitry, is the fact that the fluctuation of O2 influences the threshold voltage, which is internal parameter of the FET and can manifest itself as a voltage signal at output but as a function of the trans conductance gain. The trans-conductance is a passive parameter and in order to derive voltage or current signal from its fluctuations the sensor has to be attached to readout circuit. This circuit provides high sensitivity to the changes in percentage of O2 in the solution.

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