Comparative study on charging-up of single, double and triple Gas Electron Multipliers (GEM)

In this paper, a detailed investigation has been carried out to understand the physics behind GEM charging-up and its effects on gain. Experiments have been performed on both double and triple GEM with the help of 55Fe X-ray source and a comparative study of these configurations along with the single GEM results observed in our previous work has been reported. The increase in gain due to polarization of GEM foil dielectric and reduction in gain due to charge accumulation on dielectric are studied for various field configurations and different radiation intensities

IN-SILICO DESIGNING OF FUNCTIONAL MATERIALS

The functionalities depends on the electronic energy levels of the materials concerned and therefore understanding the electronic structure is of paramount importance in designing such materials. By using density-functional tight-binding method (DFTB) we herein discussed the pathways for improving the photovoltaic efficiency of the tetra phenyl porphyrin(TPP)-hosphorene antidot lattice(PAL) nanocomposites. The photovoltaic performance of the composite reaches a maximum value when TPP is functionalized by -NH2 group and the edge of PAL is functionalized by -CN group. We also discussed the role of chalcogen ligands on the exciton relaxation dynamics of chalcogenol functionalized CdSe QD by using non-adiabatic molecular dynamics simulation (NAMD) coupled with the DFTB method.This work was supported by the Russian Foundation for Basic Research (grant # 19-53-55002)

Perancangan Simulator PAD (Packet Assembler Disassembler) AX.25 Pada Sistem Komunikasi Satelit IINUSAT-01 Untuk Attitude monitoring Berbasis FPGA (Field Programmable Gate Array)

Sistem komunikasi satelit terjadi antara satelit yang berada di luar angkasa dengan stasiun bumi. Salah satu kebutuhan dari satelit adalah attitude monitoring yang berfungsi untuk memantau perilaku satelit. Data pemantauan perilaku satelit akan dikirimkan oleh PAD (Packet Assembler Disassembler) dalam bentuk paket data. Untuk komunikasi data dibutuhkan sebuah protokol yang mengatur tata cara komunikasi data. Protokol yang digunakan untuk komunikasi data adalah protokol AX.25. Protokol ini digunakan untuk mengirimkan informasi yang berupa teks dan data attitude monitoring. Dalam penelitian ini, protokol AX.25 ini akan diimplementasikan ke dalam perangkat lunak dan perangkat keras berbasis FPGA (Field Programmable Gate Array). Attitude monitoring PAD AX.25 yang diimplementasikan pada FPGA mampu mengirim paket data dalam waktu 0,449 detik pada baud rate 1200, dan semakin cepatnya pengiriman paket data sebanding dengan kenaikan baud rate. PAD AX.25 ini mampu mengirimkan paket data secara benar dengan eror 0% pada baud rate 1200 – 9600. Sedangkan eror koreksi sensor attitude monitoring yang digunakan sebesar ±0,072g

Ruthenium-catalyzed ring-closing metathesis on alkene-tethered Fischer carbene complexes

2398-2405Alkene-terminated tethers have been assembled around a Fischer carbene moiety by C-alkylation of the α-carbon or N-alkylation of amino carbene complexes by a phase-transfer catalyzed procedure developed in this laboratory. Small or medium-sized, pendant, fused or spirocyclic rings have then been formed by ring-closing metathesis involving such substrates in good to excellent yields. By engaging one of the allyl tethers of a diallylamino group as a ligand for the metal center, it is possible to dictate the direction of cyclization by metathesis

Exploring the potential of low-cost sensors in the production stage of the construction industry

The construction industry is massive but not so advanced in adapting and utilizing technology. Sensors and sensing technology are critical elements that can enhance the digitalization of the construction industry. The need for low-cost sensors is rapidly increasing as the industry steps into the construction 4.0 phase. This research is an exploratory study on the potential of low-cost sensors, concentrating on the temperature and humidity sensors in the production stage of construction. The methodology used in the research is a qualitative approach consisting of literature review and interviews. The literature review identified the state of art of low-cost temperature and humidity sensors. From interviews, the constraints, adaptation factors were identified. The potential application of the low-cost temperature and humidity sensors were identified from the literatures and interviews. The conclusion of the research was that there is a knowledge gap in the field of low-cost temperature and humidity sensors. Furthermore, there is lack of adaptation of sensor technology in the production stage of the construction industry even though it has potential to improve the productivity and quality. 

Exploring the potential of low-cost sensors in the production stage of the construction industry

The construction industry is massive but not so advanced in adapting and utilizing technology. Sensors and sensing technology are critical elements that can enhance the digitalization of the construction industry. The need for low-cost sensors is rapidly increasing as the industry steps into the construction 4.0 phase. This research is an exploratory study on the potential of low-cost sensors, concentrating on the temperature and humidity sensors in the production stage of construction. The methodology used in the research is a qualitative approach consisting of literature review and interviews. The literature review identified the state of art of low-cost temperature and humidity sensors. From interviews, the constraints, adaptation factors were identified. The potential application of the low-cost temperature and humidity sensors were identified from the literatures and interviews. The conclusion of the research was that there is a knowledge gap in the field of low-cost temperature and humidity sensors. Furthermore, there is lack of adaptation of sensor technology in the production stage of the construction industry even though it has potential to improve the productivity and quality. 

Commercialization and Mission Drift in Microfinance: Implications for Rural India

The emergence of microfinance has been justified as a measure to occupy the empty space that was created with the retreat of formal banking as part of structural and neoliberal reforms for rural India in post-1990s. Worldwide, although the microfinance institution (MFI) has been flouted to provide credit to unbanked areas with the broader objectives of empowering people and eventually eradicating poverty, there is much disagreement among scholars regarding its actual achievements toward these goals. While some scholars are of the opinion that MFIs are currently in a phase of “mission drift”, based on their increasing commercialization, others argue that these institutions have been always driven by the neoliberal principles of maximizing profit. In view of the globally demonstrated changes in the features and operations of MFIs, this paper uses evidence from secondary data sources to flag the changing trends in credit market with particular reference to MFIs in India. We argue that these changes provide evidence of a mission drift in microfinance that must be critically examined against the backdrop of a chronic and persistent credit crisis in rural India, which may get further exacerbated by the increasing dominance of private credit players. At this juncture, instead of taking lessons and rectifying the existing lapses in enabling rural credit, the reorientation of the MFI’s credit-delivery operation toward commercialization must be seen as a perilous step that could close the door of affordable credit to poor and petty borrowers. Chronic bottlenecks in credit delivery must be addressed through more permanent and holistic solutions

Neural network method for control valve cost estimation on the EPC project bidding

Cost estimation on the bidding phase is a crucial stage that determines the success of the Engineering, Procurement and Construction (EPC) project. If the cost offered to the client is too high then it could not compete with the other bidder, but if the cost offered are too low it can reduce profit margins and result in losses for the EPC companies. This paper describe the use of Back Propagation Neural Network method to help determine cost estimation. This method is applied specifically to determine control valve cost estimation on the bidding phase so that the retrieved costs will be accurate. When there is no technical and price quotation from vendors as well as the narrowness of the bidding processing time, this method can be an alternative choice to determine the price based on previous vendor quotation. In the future, this method could be developed and applied for other instrumentation equipment such as transmitter, switch, analyzer, control system and others to achieve total cost estimation of instrumentation equipment in EPC bidding proposal