Simulation Analysis of Current in Metal Sheath of Power Cable Considering Temperature Characteristics

This paper proposes a cable broadband circuit model considering the temperature characteristics. This paper establishes the equivalent circuit model of the cross-bonded power cable and proposes the broadband parameter calculation method considering the temperature. The cable parameters are calculated by the vector fitting method. Based on the operating current and cable temperature data of the cable on a certain day, the simulation analysis of the cable sheath current considering the temperature is carried out using Simulink. Finally, the simulation results show that the cable sheath current is significantly affected by temperature.

Conductance-stable liquid metal sheath-core microfibers for stretchy smart fabrics and self-powered sensing

Highly conductive and stretchy fibers are crucial components for smart fabrics and wearable electronics. However, most of the existing fiber conductors are strain sensitive with deteriorated conductance upon stretching, and thus, a compromised strategy via introducing merely geometric distortion of conductive path is often used for stable conductance. Here, we report a coaxial wet-spinning process for continuously fabricating intrinsically stretchable, highly conductive yet conductance-stable, liquid metal sheath-core microfibers. The microfiber can be stretched up to 1170%, and upon fully activating the conductive path, a very high conductivity of 4.35 × 104 S/m and resistance change of only 4% at 200% strain are realized, arising from both stretch-induced channel opening and stretching out of tortuous serpentine conductive path of the percolating liquid metal network. Moreover, the microfibers can be easily woven into an everyday glove or fabric, acting as excellent joule heaters, electrothermochromic displays, and self-powered wearable sensors to monitor human activities.

Über eine Gruppe hochmittelalterlicher Prunksporen im Südwesten der Ostsee

A small group of richly decorated spurs has been known for a long time for their characteristic non-ferrous metal covering as well as massive bronze or brass thorn points. Most of them have been found in in the states of Hamburg and Schleswig-Holstein. They are so similar that they could have been manufactured, if not in the same workshop, at least in the same region. The embossed metal sheath, reminiscent of the Late Slavic technology of sheath fittings, could indicate a the Slavic craft tradition. The latest find from a deserted village of Kastaven near Sähle, Oberhavel district in northern Brandenburg, sheds new light on this group of objects. The Kastaven spur has been found in the central area of the settlement which existed between the early 13th and the 15th centuries, in the vicinity of ruins of a church or a churchyard. The spur was probably lost at the village foundation phase, in the early 13th century. This context is of importance to the disputed chronology of the entire spur group, dated back to the late 12th and the early 13th centuries. The finds in Hamburg, Holstein, Eastern Mecklenburg and Northern Brandenburg indicate contacts between the élites in the southwest of the Baltic, related to migrations of petty nobility within the German Eastern Settlement or a communication network of the Slavic Leaders in the Abodrite/Mecklenburg cultural area.