<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31352622</termId><termName>carrier amplifiers</termName><termType>PT</termType><termNote><![CDATA[ Direct-current amplifiers in which the signal is passed through a low-pass filter, then used to modulate a carrier signal so it may be amplified as an alternating-current signal. The amplified DC output is obtained by rectifying and filtering the carrier signal. ]]></termNote><termCreatedDate>2026-03-30 20:35:09</termCreatedDate><relation><relationType>UF</relationType><termId>31352623</termId><termName>carrier amplifier</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31324473</termId><termName>amplifiers</termName><termType>PT</termType></relation></term>  </Zthes>