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Envelope (waves) In physics and engineering, the envelope of an oscillating signal is a smooth curve outlining its extremes. [1] The envelope thus generalizes the concept of a constant amplitude into an instantaneous amplitude. The figure illustrates a modulated sine wave varying between an upper envelope and a lower envelope.
A child's birthday party may be held at the family's home or in a public place. Soft drinks are often had alongside water and both sweet and savory foods are typically served to the guests. In many cultures, a birthday cake is served. Birthday parties for children often feature entertainment, costumes, party games, and a theme.
Birthday card. A birthday card is a greeting card given or sent to a person to celebrate their birthday. Similar to a birthday cake, birthday card traditions vary by culture but the origin of birthday cards is unclear. [1] The advent of computing and introduction of the internet and social media has led to the use of electronic birthday cards ...
Birthday cards up close. A greeting card is a piece of card stock, usually with an illustration or photo, made of high quality paper featuring an expression of friendship or other sentiment. Although greeting cards are usually given on special occasions such as birthdays, Christmas or other holidays, such as Halloween, they are also sent to ...
Hongbaos—red envelopes stuffed with money, now especially the red 100 RMB notes—are the usual gift from relatives and close family friends for most children. Gifts for adults on their birthday are much less common, although the birthday for each decade is a larger occasion that might prompt a large dinner and celebration.
An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...