With the arrival of 2018, the winter chill has settled in, and the air is getting colder by the day. As the temperature drops, people are turning to various heating solutions to stay warm. In the past, young people used to avoid using heating devices, but now they can’t help but wrap up in long pants and turn on electric heaters or blankets that have been stored for a year. In cities, electric heaters and heated bed covers are once again being used, while in rural areas, some elders still rely on traditional charcoal stoves and coal-burning heaters to keep their homes warm. Even the mahjong table, which once had a small brazier underneath, has been replaced by automated machines. The era of the charcoal brazier is fading away, and modern heating appliances have taken its place. According to a recent visit to offline appliance stores, a wide range of small heating devices have started to flood the market as the cold weather sets in. These products are now prominently displayed. According to Suning Tesco’s sales data, items such as air conditioners, water heaters, Yuba (a type of electric heater), electric radiators, space heaters, oil-filled radiators, European fast-heating stoves, foot warmers, mini solar heaters, and heated blankets are all selling well. Compared to last year, the growth rate of these products has exceeded 200%. According to a research report from CBNData titled “2017 Online Heater Consumption Series Research,” even before the official start of winter, there was already a noticeable rise in heater sales. In southern China, heating equipment is considered a necessity, while in the north, it's more about energy efficiency. Additionally, non-traditional heating tools like hand warmers and warm babies are also gaining popularity. With the growing demand for comfort, even the dishwasher market—where users don’t have to touch cold water—is seeing increased sales. It’s clear that as living standards improve and consumer preferences evolve, the variety of heating appliances is expanding, giving people more choices. Especially in the south, where central heating is rare and most of the time is warm, early air conditioners were mainly for cooling. Now, compact and affordable heating appliances are becoming more popular. Consumers can choose based on their needs and living conditions. Take air conditioners as an example. With the trend of consumption upgrades, they are no longer just for cooling and heating. Manufacturers are focusing on temperature and humidity control technology, aiming to provide a more comfortable experience rather than just adjusting the temperature. In addition, with the rise of smart home technology, many air conditioning systems now offer advanced airflow solutions, delivering natural and comfortable indoor winds. However, compared to large appliances like air conditioners, small heating devices are more convenient and compact. Despite this, some households still use traditional coal stoves and charcoal fires. But with environmental protection policies and urbanization, these outdated and potentially dangerous heating methods are becoming less acceptable. At present, the small appliance market is crowded with many brands, and product quality varies. It’s important to check for safety certifications like the “3C” mark and ensure proper grounding when purchasing. Improper use of heating devices can lead to serious safety risks, including fires. In dry winter months, indoor air becomes drier, and using air conditioners or heaters can worsen this issue. Dust and particulate matter float in the air, making it uncomfortable. Some consumers told the home grid that they often buy humidifiers alongside their heating equipment to maintain a balanced indoor environment. This way, they can enjoy both warmth and comfort throughout the winter season.

Dual Bandpass Filters

Dual-band Bandpass Filters (BPFs) provide the functionality of two separate filters, but in the size of a single filter. Dual band pass filter applications are at the leading edge of fiber optical modules and systems. Using DBPFs is a new concept in multiplex and de-multiplex module design used in optimizing wavelength ranges or channel management. The application of DBPFs makes it possible to reduce the component quantity in optical modules, enhances their performance, and enables faster data transfer in the optical backbone of major networks.

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