Modelling and simulation of a remote controlled mechatronic device

The paper introduces the design, modelling and simulation of an electromechanical actuator device able to produce periodical translation movement. The parameters characterizing this movement (stroke length, force, speed profile) are considered to be remotely programmable via a wireless interface

Projektiranje servopneumatskog aktuatora za upravljanje kočnicom bubnja dizalice naftnog bušnog vretena

U radu je predstavljeno načelno izvedbeno rješenje prigradnje pneumatskog aktuatora na polugu za ručno upravljanje vertikalnom silom nasjedanja naftnog bušnog vretena. Dane su dvije varijante upravljanja odabranim pneumatskim cilindrom primjenom proporcionalnog tlačnog regulatora te primjenom proporcionalnog servo ventila. Za slučaj primjene proporcionalnog servo ventila izveden je simulacijski model sustava regulacije tlaka u cilindru kojim se upravlja silom kočenja pojasne kočnice. Provedene su simulacije za odziv tlaka u zatvorenoj komori cilindra konstantnog volumena te za slučaj dvoradnog cilindra kod kojeg se pri izvlačenju klipnjače volumen komore mijenja. Sila reakcije pojasne kočnice modelirana pomoću modela razmjerno krute opruge. Simulacijski model izveden je u programskom paketu Matlab/Simulink

The Cerenkov free electron laser

This thesis reports on an investigation into Cerenkov Free Electron Lasers. These devices are basically travelling wave tubes but having a dielectrically lined cylinder as the slow wave structure rather than a helix. If an electron beam is injected into the centre of this structure, an interaction between the electrons and the electromagnetic (e-m) TMo I mode can occur which can lead to amplification of the e-m wave. Two different systems have been constructed. The first one was designed to operate as an oscillator at 12.4GHz and used a rectangular X-band waveguide microwave coupler. It was thought that the non-operation of this device could have been due to a lack of net gain, and so a second system was designed having a smaller diameter dielectric liner in order to achieve higher gain but at a slightly higher frequency of operation (l6.9GHz). In both systems, the interception of the electron beam with the dielectric liner was small. Unfortunately, even though a maximum electron beam current of 120mA was achieved, leading to an expected small signal gain of 1200%, no microwave output was observed either. At this stage it was considered that there must he something more fundamental at fault with these systems. After a thorough investigation. it was discovered that the small gap which always exists between the dielectric liner and the waveguide affected the dispersion relation of a Cerenkov system. Theoretically, gaps as small as 1 % of the diameter of the waveguide were found to have a serious effect, and although these gaps would not stop the operation of the Cerenkov device, microwave output would only be expected at a voltage far from that expected. It was found that the problem could be overcome by coating the outer surface of the dielectric tube with a layer of conducting material, such as silver paint, which effectively removes the gap. Further tests of a Cerenkov free electron laser with this improvement are in progress

Tennis racket performance studies and the design of a novel test machine

The investigation was instigated by a growing concern from the International Tennis Federation (ITF) that the contribution of racket technology in the modem game of tennis might be changing the nature of the game by making it too fast. The serve was earmarked as the most critical stroke influencing the speed of the game, resulting in the decision to build a test machine, which would investigate racket performance under realistic serve conditions. In order to determine the design specifications for the machine the following studies were performed. [Continues.

The interactions of general anaesthetics and high pressure with firefly luciferase

Imperial Users onl

CEPC Technical Design Report -- Accelerator (v2)

The Circular Electron Positron Collider (CEPC) is a large scientific project initiated and hosted by China, fostered through extensive collaboration with international partners. The complex comprises four accelerators: a 30 GeV Linac, a 1.1 GeV Damping Ring, a Booster capable of achieving energies up to 180 GeV, and a Collider operating at varying energy modes (Z, W, H, and ttbar). The Linac and Damping Ring are situated on the surface, while the Booster and Collider are housed in a 100 km circumference underground tunnel, strategically accommodating future expansion with provisions for a Super Proton Proton Collider (SPPC). The CEPC primarily serves as a Higgs factory. In its baseline design with synchrotron radiation (SR) power of 30 MW per beam, it can achieve a luminosity of 5e34 /cm^2/s^1, resulting in an integrated luminosity of 13 /ab for two interaction points over a decade, producing 2.6 million Higgs bosons. Increasing the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons, facilitating precise measurements of Higgs coupling at sub-percent levels, exceeding the precision expected from the HL-LHC by an order of magnitude. This Technical Design Report (TDR) follows the Preliminary Conceptual Design Report (Pre-CDR, 2015) and the Conceptual Design Report (CDR, 2018), comprehensively detailing the machine's layout and performance, physical design and analysis, technical systems design, R&D and prototyping efforts, and associated civil engineering aspects. Additionally, it includes a cost estimate and a preliminary construction timeline, establishing a framework for forthcoming engineering design phase and site selection procedures. Construction is anticipated to begin around 2027-2028, pending government approval, with an estimated duration of 8 years. The commencement of experiments could potentially initiate in the mid-2030s.Comment: 1106 page

Collected Papers (on Neutrosophics, Plithogenics, Hypersoft Set, Hypergraphs, and other topics), Volume X

This tenth volume of Collected Papers includes 86 papers in English and Spanish languages comprising 972 pages, written between 2014-2022 by the author alone or in collaboration with the following 105 co-authors (alphabetically ordered) from 26 countries: Abu Sufian, Ali Hassan, Ali Safaa Sadiq, Anirudha Ghosh, Assia Bakali, Atiqe Ur Rahman, Laura Bogdan, Willem K.M. Brauers, Erick González Caballero, Fausto Cavallaro, Gavrilă Calefariu, T. Chalapathi, Victor Christianto, Mihaela Colhon, Sergiu Boris Cononovici, Mamoni Dhar, Irfan Deli, Rebeca Escobar-Jara, Alexandru Gal, N. Gandotra, Sudipta Gayen, Vassilis C. Gerogiannis, Noel Batista Hernández, Hongnian Yu, Hongbo Wang, Mihaiela Iliescu, F. Nirmala Irudayam, Sripati Jha, Darjan Karabašević, T. Katican, Bakhtawar Ali Khan, Hina Khan, Volodymyr Krasnoholovets, R. Kiran Kumar, Manoranjan Kumar Singh, Ranjan Kumar, M. Lathamaheswari, Yasar Mahmood, Nivetha Martin, Adrian Mărgean, Octavian Melinte, Mingcong Deng, Marcel Migdalovici, Monika Moga, Sana Moin, Mohamed Abdel-Basset, Mohamed Elhoseny, Rehab Mohamed, Mohamed Talea, Kalyan Mondal, Muhammad Aslam, Muhammad Aslam Malik, Muhammad Ihsan, Muhammad Naveed Jafar, Muhammad Rayees Ahmad, Muhammad Saeed, Muhammad Saqlain, Muhammad Shabir, Mujahid Abbas, Mumtaz Ali, Radu I. Munteanu, Ghulam Murtaza, Munazza Naz, Tahsin Oner, ‪Gabrijela Popović‬‬‬‬‬, Surapati Pramanik, R. Priya, S.P. Priyadharshini, Midha Qayyum, Quang-Thinh Bui, Shazia Rana, Akbara Rezaei, Jesús Estupiñán Ricardo, Rıdvan Sahin, Saeeda Mirvakili, Said Broumi, A. A. Salama, Flavius Aurelian Sârbu, Ganeshsree Selvachandran, Javid Shabbir, Shio Gai Quek, Son Hoang Le, Florentin Smarandache, Dragiša Stanujkić, S. Sudha, Taha Yasin Ozturk, Zaigham Tahir, The Houw Iong, Ayse Topal, Alptekin Ulutaș, Maikel Yelandi Leyva Vázquez, Rizha Vitania, Luige Vlădăreanu, Victor Vlădăreanu, Ștefan Vlăduțescu, J. Vimala, Dan Valeriu Voinea, Adem Yolcu, Yongfei Feng, Abd El-Nasser H. Zaied, Edmundas Kazimieras Zavadskas.‬