Analysis and Diagnosis of Shielded Cable Faults Based on Finite-Element Method and Time-Reversal Time-Frequency Domain Reflectometry

Diagnostic Value of Color Doppler Ultrasonography in Subacute Thyroiditis

“…Hua, Wang, and Zhang studied the clinical characteristics of 852 SAT patients before treatment and found that most of the laboratory test results were related to thyrotoxicosis and inflammation and liver dysfunction, and the abnormal peak level often appeared one week after the onset. The whole disease stage of typical SAT patients can be divided into three stages: acute stage with hyperthyroidism, remission stage with hypothyroidism (divided into transition stage and hypothyroidism stage), and recovery stage (normal thyroid function stage) [ 8 ]. Moreover, Svedin, Dillon, and Parker have found that when the volume of the lesion is too large and all the ROI contains the lesion tissue, but not the normal tissue for comparison, it is often difficult to obtain a satisfactory ultrasonic elastic image, and the results cannot reflect the real hardness of the lesion.…”

Design of filtering cable with defected conductor layer

“…The comparative characterization of the proposed filtering cables with various existing cables and filtering techniques is presented in Table 1 . Shielding cables 16 can shield EMI, coaxial cables 17 can achieve high bandwidth communication over relatively long lines, and twisted wire pair 18 can eliminate common-mode interference. However, none of them have filtering capabilities, while filtering cables are capable of filtering EMI.…”

“…It is an efficient and complex electromagnetic environment solution that integrates filtering, shielding, and grounding. The most important feature is the distributed filtering function along the length of the cable 14 Shielding cable Cables with a shielding layer can achieve electromagnetic shielding performance, but they do not have a filtering function 15 Coaxial cable Invented by Oliver Heaviside, coaxial cables provide stable impedance and phase in a broad frequency band and have good signal integrity, but they do not have a filtering function 16 Twisted-wire pair A pair of mutually insulated wires is twisted together to transfer differential mode signals and eliminate common mode interference 17 Flexible microstrip-filtered transmission line The flexible microstrip-filtered transmission line is made of FPCB, which is very thin and light, and has filtering capabilities. It can replace traditional coaxial lines and be conveniently used for mobile or flexible communication terminals 18 Suspension filter circuit The filtering function is achieved by adding capacitors and wires to the silicon rubber pad, which can be installed in the connectors.…”

“…In order to improve EMC, shielded cables and lumped filters are commonly employed for interconnections within and between equipment. Existing particular cables and filters technologies include shielding 16 , coaxial geometry for achieving electromagnetic shielding with stable impedance and phase 17 , twisted-pair geometry for reducing common-mode interference 18 , flexible microstrip filter transmission line with defected ground structure (DGS) 19 , suspension filter circuit 20 , filtering connector 21 , magnetic material filtering 22 , lumped electronic components filters 23 , waveguide filters 24 , ceramic filters 25 , 26 , DGS filters 27 , microstrip filters 28 , 29 , and various types of filters 30 , 31 , etc. However, it is worth noting that, currently there is a lack of distributed filtering functionality along the length of the cable.…”

Fault detection and localization in unshielded twisted pair cable based on observability analysis and reflectometry experimental measurements

“…The joint time-frequency domain reflectometry (JTFDR) captures many of the advantages of both TDR and FDR by allowing customized reference signal parameters like frequency bandwidth, center frequency, and time duration to provide a unique time-frequency cross-correlation function in order to detect soft faults with acceptable accuracy. JTFDR techniques were applied to monitor high-temperature superconducting cables [8], shielded cable [9], or to study and follow the aging process of electric power cables [10,11].…”