Highly Configurable 100 Channel Recording and Stimulating Integrated Circuit for Biomedical Experiments

This paper presents the design results of a 100-channel integrated circuit dedicated to various biomedical experiments requiring both electrical stimulation and recording ability. The main design motivation was to develop an architecture that would comprise not only the recording and stimulation, but would also block allowing to meet different experimental requirements. Therefore, both the controllability and programmability were prime concerns, as well as the main chip parameters uniformity. The recording stage allows one to set their parameters independently from channel to channel, i.e., the frequency bandwidth can be controlled in the (0.3 Hz–1 kHz)–(20 Hz–3 kHz) (slow signal path) or (0.3 Hz–1 kHz)–4.7 kHz (fast signal path) range, while the voltage gain can be set individually either to 43.5 dB or 52 dB. Importantly, thanks to in-pixel circuitry, main system parameters may be controlled individually allowing to mitigate the circuitry components spread, i.e., lower corner frequency can be tuned in the 54 dB range with approximately 5% precision, and the upper corner frequency spread is only 4.2%, while the voltage gain spread is only 0.62%. The current stimulator may also be controlled in the broad range (69 dB) with its current setting precision being no worse than 2.6%. The recording channels’ input-referred noise is equal to 8.5 µVRMS in the 10 Hz–4.7 kHz bandwidth. The single-pixel occupies 0.16 mm2 and consumes 12 µW (recording part) and 22 µW (stimulation blocks).

Heat Kernels Estimates for Hermitian Line Bundles on Manifolds of Bounded Geometry

We consider a family of semiclassically scaled second-order elliptic differential operators on high tensor powers of a Hermitian line bundle (possibly, twisted by an auxiliary Hermitian vector bundle of arbitrary rank) on a Riemannian manifold of bounded geometry. We establish an off-diagonal Gaussian upper bound for the associated heat kernel. The proof is based on some tools from the theory of operator semigroups in a Hilbert space, results on Sobolev spaces adapted to the current setting, and weighted estimates with appropriate exponential weights.

Exploring the Mission-Development Nexus Through Stories from Christian ‘Missionaries’ in Bangladesh

<p>Over the past decade, development research and policy has increasingly paid attention to religion and belief. Donors and researchers have progressively engaged with faith-based organisations and recipients. However, Christian mission and ‗missionaries‘ remain underexplored aspects within religion and development discourses. In response, this research explores stories from eleven Christian ‗missionaries‘ in Bangladesh. Firstly, I assess how the changing non-governmental sector in Bangladesh influenced participants‘ activities. Secondly, I contextualise their stories within religion and development discourses with reference to analyses of development workers. Finally, I reflect on the significance of spirituality in participants‘ lives. I also describe how spirituality played a role in my research. I frame this research within feminist and poststructuralist ways of knowing. Methodologically, I conducted semi-structured interviews and ‗hung out‘ with participants. I ‗wrote myself-in‘ to this research to highlight how the process intersected with my own subject positions. I found that participants‘ engaged with development in similar ways to development workers as analysed by others. They reproduced discourses of modernisation, expertise, altruism, and the ‗third world‘. They additionally responded to Christian discourses, such as ‗calling‘. Participants‘ activities and subjectivities were shaped by these intersecting discourses, and were also shaped by the historic and current setting of Bangladesh. Missionaries‘ stories revealed some aspects of the ‗mission-development nexus‘ in Bangladesh (Fountain, 2012). Participants‘ stories and my own research experience, also demonstrated that engagement with belief in God can be difficult within development and within ‗the academy‘ (Shahjahan, 2005).</p>

Exploring the Mission-Development Nexus Through Stories from Christian ‘Missionaries’ in Bangladesh

<p>Over the past decade, development research and policy has increasingly paid attention to religion and belief. Donors and researchers have progressively engaged with faith-based organisations and recipients. However, Christian mission and ‗missionaries‘ remain underexplored aspects within religion and development discourses. In response, this research explores stories from eleven Christian ‗missionaries‘ in Bangladesh. Firstly, I assess how the changing non-governmental sector in Bangladesh influenced participants‘ activities. Secondly, I contextualise their stories within religion and development discourses with reference to analyses of development workers. Finally, I reflect on the significance of spirituality in participants‘ lives. I also describe how spirituality played a role in my research. I frame this research within feminist and poststructuralist ways of knowing. Methodologically, I conducted semi-structured interviews and ‗hung out‘ with participants. I ‗wrote myself-in‘ to this research to highlight how the process intersected with my own subject positions. I found that participants‘ engaged with development in similar ways to development workers as analysed by others. They reproduced discourses of modernisation, expertise, altruism, and the ‗third world‘. They additionally responded to Christian discourses, such as ‗calling‘. Participants‘ activities and subjectivities were shaped by these intersecting discourses, and were also shaped by the historic and current setting of Bangladesh. Missionaries‘ stories revealed some aspects of the ‗mission-development nexus‘ in Bangladesh (Fountain, 2012). Participants‘ stories and my own research experience, also demonstrated that engagement with belief in God can be difficult within development and within ‗the academy‘ (Shahjahan, 2005).</p>

14-bit ADC as voltage monitoring device for power supply module 6 using I2C interface

<p>Thereare recorded downtime in the current testing processes of microelectronic packages. The available test equipment, the isolation of the power supply modules and the processes of testing must be changed in order to minimize the downtime. This study presents the design and development of a voltage monitoring device made of a 14-bit analog to digital converter (ADC) interfaced through inter-integrated circuit (I2C) for power supply module 6 (PS6). It is built to address the downtime in isolation and testing process of PS6. This setup is able to monitor and display three output voltages operating in 4-12V signals through athin film transistor (TFT) monitor. Tests were conducted for the nominal voltage and current setting scalled the three-point tests. In result, the fault detection and calibration process of PS6 are able to minimize downtimes. The developed voltage monitoring device has an acceptable percentage of 0.04572% which also canbe a replacement for digital multimeters (DMMs) for specific applications to PS6.</p>

Analisis Resetting Relay Dan Load Presentase Terhadap Pola Pelaksanaan Dan Pemeliharaan Pada Gardu Induk 150 Kv Saketi Banten

Abstrac: The Saketi substation has three 150/70 kV power transformers with a capacity of 3x60 MVA with a frequency of 50 Hz where all three transformers have the capacity, transformer 1 60 MVA (PAUWELS TRAFO) has 3 feeders with an average load of 300 A, 10 MW, transformer 2 60 MVA (UNINDO) has 3 feeders with an average load of 200 A, 6.9 MW and transformer 3 60 MVA (UNINDO) has 4 feeders with an average load of 300 A, 10 MW. This calculation and simulation analysis is carried out aiming to find out the relay settings on each transformer under normal conditions and in a maintenance state on one of the transformers for a long period of time. From the results of the analysis and calculation, it was found that the OCR relay setting under normal conditions of the incoming 150 kV transformer transformers 1, 2, and 3 has a current setting value of 0.92 A and a time setting of 0.36 seconds. On the outgoing side the 20 kV transformers 1, 2, and 3 have a setting of 1,039 A and a time setting of 0.166 seconds.

Studi Kinerja Relay Proteksi pada Transformator II 150/20 KV 50 MVA dengan Penyulang Lakarsantri di GIS Karangpilang PT. PLN (Persero) UPT Malang ULTG

The substation is one of the components of the electric power system that is an important role in the distribution of electrical energy and load regulation. In the process of distributing electrical energy, continuity of good service is needed, but the interferences still often occur, both internal and external. On Sunday, July 21, 2019 there was an interference, Lakarsantri feeder CB failed to trip so make the incoming 20kV CB trip. That interference was caused by the burning of the Switching Substation in the Citraland area. Therefore, a new relay setting is needed as a recommendation to use transformator 2 to avoid the recurrence of a similar fault. The relay settings have shown good results where the working time of the relay on the outgoing feeder side is faster than the incoming feeder 20kV and the incoming transformator 150kV side, when coordination simulated using the E-TAP 12.6.0 software by entering the current setting and the time setting, it shows good coordination because when there is an interference on the outgoing feeder, CB outgoing feeder works first, not the incoming feeder 20kV CB or the incoming transformator 150kV CB. Preventive maintenance on other equipment such as CB and CT need to be be done to increase of equipment reliability to reduce the occurs of protection failure or damage to the equipment

Automatic Overcurrent Protection Coordination after Distribution Network Reconfiguration Based on Peer-To-Peer Communication

Electrical power systems represent a fundamental part of society, and their efficient operations are of vital importance for social and economic development. Power systems have been designed to withstand interruptions under already provided safety and quality principles; however, there are some extreme and not so frequent events that could represent inconveniences for the correct operation of the entire system. For this reason, in recent years the term resilience, which serves to describe the capacity of a system to recover from an unwanted event, has been analyzed on planning, operation and remedial actions. This work is focused on the implementation of a topological reconfiguration tool, which is oriented to change the structure of primary feeders based on changing the status of switchgears. Once the distribution network has been reconfigured, an algorithm of protection coordination is executed based on communication peer-to-peer between Matlab and PowerFactory, which develops an adaptive calculation to determine the current setting and the time multiplier setting. The reconfiguration and coordination protection algorithms could be implemented and evaluated on different distribution networks, areas and locations.

Aplicabilidade das metodologias ativas no ensino em saúde à distância: uma revisão integrativa

This study aims to analyze, through an integrative review, the applicability of methodologies in a context of distance education. The search for articles was carried out on the Google Scholar research platform, using the descriptors Distance Education, Problem-Based Learning, and Health Education. At the end, 12 articles were selected, whose analysis allowed the identification of three categories that address the historical evolution of teaching methodologies, tools, and their applicability to the current Brazilian context, and main difficulties. The study of the literature confirmed the increasingly important role of the insertion of technological resources in health education, and allowed the identification of resources having greater practicality and feasibility of application in the current setting in Brazil. Among the Digital Technologies of Information and Communication allowing the use of methodologies as a way of teaching, the use of digital narratives in the learning process and virtual learning platforms stands out.