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Post-quake search and rescue and safety precautions
In the wake of the 7.0-magnitude earthquake that struck Lushan County, Ya'an City, Sichuan Province on April 20th, the critical "Golden 72 Hours" have begun. During this time, every second counts for those trapped under the rubble. As rescue teams work tirelessly, it's essential to understand how to respond before, during, and after an earthquake to increase survival chances and ensure safety.
**Preparation is Key**
Before an earthquake strikes, it's crucial to be ready. Each person should have at least 3.8 liters of water per day, enough for three days. Storing bottled water is a smart choice. For food, prepare non-perishable items such as canned goods, dehydrated meals, powdered milk, and fruit juices. Dry cereals, nuts, and dried fruits are excellent sources of nutrition.
**During the Earthquake**
If you're indoors, take cover under a sturdy table or desk, and hold on to it. If no furniture is available, protect your head with your arms and curl up in a corner. If you're in bed, stay there and use a pillow to shield your head. Avoid parking under buildings, trees, bridges, or power lines. Once the shaking stops, drive carefully, checking for road and bridge damage. If safe, remain in your vehicle.
**After the Earthquake**
If you're trapped, don't light fires or use a lighter—this can cause explosions. Cover your mouth with a cloth and avoid moving to prevent inhaling dust. Never use elevators to escape. Stay away from buildings, trees, streetlights, and power lines. Keep emergency lights nearby in your home, car, and bedroom. Avoid using matches or candles unless you’re certain there’s no gas leak.
**Essential Supplies**
Always have a first aid kit at home and in your car. Teach family members basic first aid and CPR. Keep a fire extinguisher accessible. Prepare special items like medications, batteries for hearing aids, baby supplies, and hygiene products. Include tools such as a wrench, waterproof matches, a whistle, and a flashlight. Don’t forget warm clothing and sleeping bags, as temperatures can drop quickly after an earthquake.
**Search and Rescue Techniques**
Rescue operations typically involve three main methods: manual search, instrument-based search, and the use of search dogs. Manual search involves using loudspeakers or other devices to locate survivors, followed by careful listening for sounds. This method is highly accurate. Instrumental search uses sound and vibration sensors, and in some cases, infrared or fiber-optic equipment. Search dogs are often deployed early in rescue missions due to their keen sense of smell.
Staying informed, being prepared, and knowing what to do in an emergency can save lives. Take these steps seriously and share this knowledge with others to help build a safer community.
A searchlight is a device with a powerful light source and a concave mirror, mainly used for remote illumination and search. A searchlight concentrates the light in a very small solid Angle (generally less than 2 degrees) through a mirror or lens to obtain a large light intensity. Most of these devices are attached to tripods or mobile vehicles, and large searchlights even have dedicated vehicles, such as trucks. The history of searchlight can be traced back to the 19th century, with the development of technology, modern searchlight has high efficiency, intelligent control and other functions, widely used in military, navigation, search and rescue, construction and large sports venues and other fields.
The core advantages of searchlights are their powerful light source and precise optical system, usually using high-intensity discharge lamps (HID) such as xenon lamps or LED as light sources to achieve high brightness illumination over long distances. LED light sources are becoming the mainstream choice because of their energy saving, long life and low heating characteristics. The mechanical structure of the searchlight includes a robust stand and an adjustable rotating mechanism, ensuring stability and flexibility in a variety of environmental conditions. In addition, the modern searchlight is also equipped with an advanced control system, which supports manual and remote control operation to achieve precise control of the beam.
The searchlight is designed with durability in mind in extreme environments, using water -, dust -, corrosion - and earthquake-resistant materials and construction to ensure stable operation in harsh environments. The appearance design takes into account practicality and aesthetics to meet the aesthetic and functional requirements of different application scenarios. With the continuous progress of technology, the performance and intelligence level of searchlights will continue to improve to meet the changing market demand.