Electromagnetism

This thesis emphasizes on implementing and experimentally demonstrating innovative fabrication solutions for micro-scale metamaterials designed to operate in the terahertz electromagnetic regime. Microfabrication is a conventional fabrication technique that has been employed to fabricate metamaterials operating at terahertz frequencies.

81p runthenight07 01-03-2023 7 4   Download

This thesis derives closed form equations to describe electromagnetic device characteristics for a toroid, solenoid and a case study induction machine. By considering stored magnetic field energy, this approach allows the relationship between electrical, magnetic and kinetic energy to be quantified and analyzed in ways that allows improved accuracy compared with conventional magnetic circuit modeling methods. This thesis also provides insights into how geometric parameters impact energy transfer and operational characteristics of electromagnetic devices.

112p runthenight04 02-02-2023 6 2   Download

This project is focused on studying the biological effects of low-power RF radiation on the expression and function of mechanosensitive ion channel protein (Piezo-1). To evaluate the effects of long-term exposures, cells were exposed at the frequency of 1800 MHz and power of 17 dBm for a period of 2 and 4 hrs using the transverse electromagnetic (TEM) cell exposure system. To study the effects of short-term RF radiation (10 min), exposures emitted from the mobile phone headset at the frequency of 845 MHz and powers of -15 dBm and -5 dBm were applied to cell cultures.

141p runthenight04 02-02-2023 9 3   Download

Research purpose: to build an analytical model representing the cross Kerr nonlinear coefficient of a four-energy quantum system in the inverse Y configuration in the presence of the Doppler effect. Apply the analytical results to the case of 87Rb at room temperature. Studying the ability to control and enhance the cross Kerr nonlinearity according to the parameters of the associated laser field and the temperature of the environment.

26p prisonbreak123 21-05-2021 18 4   Download

We present the beam dynamics and electromagnetic studies of a 3 MeV, 325 MHz H radio frequency quadrupole (RFQ) accelerator for the proposed Indian Spallation Neutron Source project. We have followed a design approach, where the emittance growth and the losses are minimized by keeping the tune depression ratio larger than 0.5.

17p christabelhuynh 29-05-2020 11 2   Download

The aim of this work is to focus on nuclear structure data used at low energy where electromagnetic transitions can be measured. The RIPL3 database linked to the FIFRELIN Monte Carlo code contains such data and their influence on fission observables is reviewed.

5p christabelhuynh 29-05-2020 6 2   Download

An Eddy current damper uses magnets to suppress vibrations due to external excitations. These dampers also called electromagnetic dampers, have advantages of no mechanical contact, high reliability and stability, but require a relatively large volume and mass to attain a given amount of damping.

8p tohitohi 19-05-2020 27 3   Download

Purposes of the thesis: Propose physical mechanism to investigate metamaterial absorber operating in THz region. Design, simulation, and characterizations of MA in THz region. Optimize parameter structure to increase absorption and broaden operating wavelength region, modify operating wavelength by external factors.

27p xacxuoc4321 09-07-2019 31 4   Download

A system such as a nucleus may consist of many particles coupled together so that in any given state, the nucleus possesses a total magnetic moment  and a total angular momentum J. Two vectors may be taken as parallel.

14p sakuraphuong 03-06-2013 52 2   Download

QUY CHUẨN KỸ THUẬT QUỐC GIA QCVN 9 : 2012/BKHCN VỀ TƯƠNG THÍCH ĐIỆN TỪ ĐỐI VỚI THIẾT BỊ ĐIỆN VÀ ĐIỆN TỬ GIA DỤNG VÀ CÁC MỤC ĐÍCH TƯƠNG TỰ National technical regulation on electromagnetic compatibility for household and similar electrical and electronic equipment Lời nói đầu QCVN 9 : 2012/BKHCN do Ban soạn thảo quy chuẩn kỹ thuật quốc gia về tương thích điện từ đối với thiết bị điện và điện tử biên soạn, Tổng cục Tiêu chuẩn Đo lường Chất lượng trình duyệt và được ban hành theo Thông tư số 11/2012/TT-BKHCN ngày 12 tháng 4 năm...

4p waduroi 15-11-2012 155 10   Download

Inductive proximity sensors are widely used in various applications to detect metal devices. They consist of an oscillator, trigger, and switching amplifier. If a metal object enters the electromagnetic field of the oscillator coil, eddy currents are induced in this coil which change the amplitude of oscillation, which causes the trigger stage to trip and the semiconductor output stage to switch.

16p mr_thanhhung 19-05-2012 352 90   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Frequency and 2D Angle Estimation Based on a Sparse Uniform Array of Electromagnetic Vector Sensors

9p dauphong20 10-03-2012 41 6   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Improved Electromagnetic Interference Shielding Properties of MWCNT–PMMA Composites Using Layered Structures

8p sting09 21-02-2012 38 3   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Computationally Efficient DOA and Polarization Estimation of Coherent Sources with Linear Electromagnetic Vector-Sensor Array

10p sting05 09-02-2012 39 5   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Inorganic nanotubes reinforced polyvinylidene fluoride composites as low-cost electromagnetic interference shielding materials

11p sting05 09-02-2012 71 5   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Transient effect of weak electromagnetic fields on calcium ion concentration in Arabidopsis thaliana

9p panasonic06 25-12-2011 45 3   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Predictive factors for beneficial application of high-frequency electromagnetics for tumour vaporization and coagulation in neurosurgery

5p matuot_238 13-10-2011 67 3   Download

rong bài báo này, chúng tôi giới thiệu một tế bào điện từ ngang (TEM: Transverse Electromagnetic) dùng để đo các vấn đề về tương thích điện từ (EMC: Electromagnetic Compatibility). Ma trận đường truyền (TLM: Transmission Line Matrix) cung cấp phương pháp hiệu quả để giải quyết các vấn đề trong mạng này. Việc khai thác phương pháp TLM rất quan trọng về phương diện tổng quát cũng như lý thuyết đường truyền. Trên cơ sở nghiên cứu các kiểu nút 3D, thuật toán của phương pháp TLM được sử dụng để tính toán toán lưới nhằm xác định...

8p phalinh17 13-08-2011 72 10   Download

This product complies with the requirements of the following European Community Directives: 89/336/EC (Electromagnetic Compatibility) and 73/23/EC (Low Voltage) as amended by 93/68/EC (CE-Marking). Overvoltage category III 1000V; pollution degree 2. CAT I: For signal level, telecommunication, electronic with small transient over voltage CAT II: For local level, appliances, main wall outlets, portable equipment CAT III: Distribution level, fixed installation, with smaller transient overvoltages than CAT IV....

5p hungktdt 10-12-2010 99 7   Download

Many automotive EMC problems are attributed to “bad ground” connections. Bad ground seems to be the cause of many problems in all types of electrical circuits. The reason that there are bad ground connections is simple. There is not a “ground” anywhere on a vehicle! The reason there is no ground connection is also simple. The vehicle is intended to travel on the ground, not attached to it. Actually, the one time when there can be a ground connection on a vehicle this is shown in Figure 3.1: In this case, if the ground connection is maintained, it can be seen...

20p tieutaithan 19-11-2010 81 9   Download