Acoustics

Acoustics (from Greek ακουστικός pronounced akoustikos meaning "of or for hearing, ready to hear") is the science that studies sound, in particular its production, transmission, and effects. The science of acoustics has many applications which are dependent upon the nature of the sound that is to be produced, transmitted or controlled.

In the case of a desirable sound, such as music, the main application of acoustics is to make the music sound as good as possible. In the case of an undesirable sound, such as traffic noise, the main application of acoustics is in noise reduction.

Another major area of acoustics is in the field of ultrasound which has applications in detection, such as sonar systems or non-destructive material testing. The articles in this Wikibook describe the fundamentals of acoustics and some of the major applications.

QUAIL BIRDS..

Quail is a collective name for several genera of mid-sized birds generally placed in the order Galliformes. The collective noun for a group of quail is a flock, covey,or bevy.

Old World quail are placed in the family Phasianidae, and New World quail are placed in the family Odontophoridae. The species of buttonquail are named for their superficial resemblance to quail, and form the family Turnicidae in the order Charadriiformes. The king quail, an Old World quail, often is sold in the pet trade, and within this trade is commonly, though mistakenly, referred to as a "button quail". Many of the common larger species are farm-raised for table food or egg consumption, and are hunted on game farms or in the wild, where they may be released to supplement the wild population, or extend into areas outside their natural range. In 2007, 40 million quail were produced in the U.S 

Menstrual Cup -menstrual hygiene device- Usage

 A menstrual cup is a menstrual hygiene device which is inserted into the vagina during menstruation. Its purpose is to collect menstrual fluid (blood from the uterine lining mixed with other fluids). Menstrual cups are usually made of flexible medical grade silicone, latex, or a thermoplastic isomer. They are shaped like a bell with a stem or a ring. The stem is used for insertion and removal, and the bell-shaped cup seals against the vaginal wall just below the cervix and collects menstrual fluid. This is unlike tampons and menstrual pads, which absorb the fluid instead.

Every 4–12 hours (depending on the amount of flow), the cup is removed, emptied, rinsed, and reinserted. After each period, the cup requires cleaning. One cup may be reusable for up to 10 years, making their long-term cost lower than that of disposable tampons or pads, though the initial cost is higher. As menstrual cups are reusable, they generate less solid waste than tampons and pads, both from the products themselves and from their packaging. Most menstrual cup brands sell a smaller and a larger size. Some menstrual cups are sold colorless and translucent, but several brands also offer colored cups. Menstrual cups typically do not leak if used properly, though incorrect placement or inadequate cup size can cause some women to experience leakage. Menstrual cups are a safe alternative to other menstrual products; risk of toxic shock syndrome infection is similar or less with menstrual cups compared to pads or tampons.

The menstrual cup is first folded or pinched and then inserted into the vagina. It will normally unfold automatically and create a light seal against the cervix. In some cases, the user may need to twist the cup or flex the vaginal muscles to ensure the cup is fully open. If correctly inserted, the cup should not leak or cause any discomfort. The stem should be completely inside the vagina. If it is not, the stem can be trimmed. There are various folding techniques for insertion; common folds include the c-fold, as well as the punch-down fold.

If lubrication is necessary for insertion, it should be water-based, as silicone lubricant can be damaging to the silicone. After 4–12 hours of use (depending on the amount of flow), the cup is removed by reaching up to its stem to find the base. Simply pulling on the stem is not recommended to remove the cup, as this can create suction. The base of the cup is pinched to release the seal, and the cup is removed. After emptying, a menstrual cup should be rinsed or wiped and reinserted. It can be washed with a mild soap, and sterilized in boiling water for a few minutes at the end of the cycle. Alternatively, sterilizing solutions (usually developed for baby bottles and breast pump equipment) may be used to soak the cup. Specific cleaning instructions vary by brand.

Advantages

When using a menstrual cup, the menstrual fluid is collected after it flows from the cervix and is held in liquid form. With tampons, liquid is absorbed and held in semi-coagulated form against the cervix. If a user needs to track the amount of menses produced (e.g., for medical reasons), a menstrual cup allows one to do so accurately. Users employ about 1-2 liters of water to clear menstrual cups

Alzheimer's disease

Alzheimer's disease (AD) is a neurodegenerative disease that usually starts slowly and progressively worsens. It is the cause of 60–70% of cases of dementia.The most common early symptom is difficulty in remembering recent events.As the disease advances, symptoms can include problems with language, disorientation (including easily getting lost), mood swings, loss of motivation, self-neglect, and behavioral issues.As a person's condition declines, they often withdraw from family and society. Gradually, bodily functions are lost, ultimately leading to death. Although the speed of progression can vary, the typical life expectancy following diagnosis is three to nine years

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KNOW ABOUT PORBANDAR

Do you know about porbadar? its need to know about Porbandar. Porbandar  is a city in the Indian state of Gujarat, perhaps best known for being the birthplace of Mahatma Gandhi and Sudama. It is the administrative center of the Porbandar District and it was the former capital of the Porbandar princely state. As the birthplace of one of the most famous leaders of the world, Porbandar has a significant tourism-led infrastructure and economy. The area around Mahatma Gandhi's home has been renovated to make a temple of peace.

Porbandar's beach locally known as 'Chowpati' has a long, sandy expanse along the ocean. Construction activities to provide attractions and manage litter and facilities on Chowpati Beach started in around 2003. It has been furnished with well-arranged seating for tourists and commuters; there is a skating rink for children. The Chowpati ground has been used for the 'Janamastmi Fair', an annual festival. This place is well equipped with a circuit house and a range of hotels nearby for visitors.

Fisheries give a lot of employment to the city and to neighboring districts. Porbandar is also one of the last coasts remaining where the threatened marine mammal dugong can be found. Officials are working out for the conservation policies for the mammal.