People can hear the sound due to the vibration of the object, and its frequency is within the range of 20HZ-20KHZ ultrasonic sensor. More than 20KHZ is called ultrasonic wave, and those below 20HZ are called infrasound waves. Commonly used ultrasonic frequencies are dozens of KHZ-tens of MHZ. Ultras ......
Common printers in the domestic market currently have two different print heads due to brand differences. One is a flat-pressure print head. The entire print head is pressed on a carbon ribbon. This print head can adapt to various carbon ribbons. With a wide user base, this print head is the most ......
Because customers often encounter the situation that the constant temperature and humidity equipment is not cooling, so here today with everyone to study and study, the following opinions are for reference only. Analysis one: 1. Because the temperature cannot be maintained, observe whether the r ......
Pyruvic acid CH3COCOOH, formerly known as tartaric acid (De Brenztr-aubensure), alias 2-oxopropionic acid, acetoformic acid, looking to light yellow liquid, smell of acetic acid It is one of the intermediate products involved in the basic metabolism of the entire organism. Due to α-keto acid an ......
Cas No. 81-93-6 Molecular formula C18HClN4 Molecular weight 322.79 Phenosafranine Green shiny crystal. It is easily soluble in water and alcohol. The water and alcohol are purple-red and have green-yellow fluorescence. Melting point: 300 ° C The product is used as an acid-base indicator, ......
According to reports, in the past, China's research and development of scientific instrument project undertaking departments, the Chinese Academy of Sciences accounted for 39.4, universities accounted for 33.3%, ministries and commissions research institutes accounted for 21.2, factories accou ......
The rapid intelligent sulfur determination instrument belongs to high-precision coal quality testing equipment, and special attention should be paid to daily maintenance and repair. details as follows: 1. The sample delivery unit of the rapid intelligent sulfur determination instrument is a mecha ......
Although Chinese viewers have long been accustomed to watching TV shows on the Internet, video sites have burned money to buy online rights for movies and TV shows, which is what happened in the last two years. Five years ago, the online copyright of the 81-episode TV series "Wulin Gaiden&quo ......
Rat Runt related gene 2 (RUNX 2) ELISA detection kit user's Guide Detection principle The kit uses double antibody one-step sandwich enzyme-linked immunosorbent assay (ELISA). To the coated microwells pre-coated with rat Runt related gene 2 (RUNX 2) capture antibody, add specimens, standard ......
China Education Equipment Purchasing Network News: According to a recent report from Nikkan Kogyo Shimbun, the Japanese Energy Industry Technology Comprehensive Research and Development Agency and the Kawasaki Industry Group have jointly invested 10 billion yen to plan to cooperate with Australia ......