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Tiêu chuẩn tiếng ồn quốc gia

2013년 09월 04일 10시 15분 42초

관련 뉴스

Does thermal shock cause damage to electronic components?
2026년 07월 22일 10시 40분 49초

An electronic component may operate stably under constant temperature conditions yet fail after repeated rapid transitions between hot and cold. The issue typically stems not from a specific temperature level, but rather from the rate of temperature change and the number of hot-cold cycles

The rigorous standards behind a multi-million-dollar MRI suite
2026년 07월 21일 14시 54분 01초

An MRI system may be correctly installed and fully connected to the power supply, yet still encounter issues if the surrounding environment fails to meet technical specifications. Electromagnetic interference, RF shielding, power quality, grounding, temperature, humidity, and particulate levels are all factors that may require assessment, depending on the facility's design and the manufacturer's requirements.

Sinusoidal and Random Vibration: A Test Setup Guide for Industrial Engineers
2026년 07월 21일 10시 30분 38초

During the operation of industrial machinery or the transportation of goods, persistent mechanical vibrations inevitably occur; these are a primary cause of material fatigue, loosened connections, and cracking in printed circuit boards (PCBs). To ensure product integrity before delivery to customers, R&D and QA/QC engineers must simulate these dynamic forces using vibration test systems.

Capacities of laboratory centrifuge tubes
2026년 07월 20일 13시 55분 40초

Tubes with capacities of 0.2 ml, 1.5 ml, 15 ml, or 50 ml are commonly found in laboratories, yet each type is associated with specific sample categories and equipment configurations. DNA and RNA samples typically require small-volume microtubes; blood and cell samples often utilize 5 ml or 15 ml tubes; while large-volume processing workflows may require tubes of 50 ml, 100 ml, or greater capacity

How Much Does Atmospheric Pressure Need to Drop Before It Rains ?
2026년 07월 20일 10시 11분 04초

A barometric pressure meter (barometer) often detects changes in weather conditions before rainfall begins. As atmospheric pressure falls, the structure of the surrounding air mass is also changing. However, there is no fixed pressure threshold that guarantees rain will occur.

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