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A permanent wave, commonly called a perm or permanent (sometimes called a "curly perm" to distinguish it from a "straight perm"), [1] is a hairstyle consisting of waves or curls set into the hair. The curls may last a number of months, hence the name. Perms may be applied using thermal or chemical means.
A digital perm is a perm that uses hot rods with the temperature regulated by a machine with a digital display, hence the name. [1] The process is otherwise similar to that of a traditional perm. The name "digital perm" is trademarked by a Japanese company, Paimore Co. [2] Hairstylists usually call it a "hot perm."
Thermal methods do not cause azoospermia, but a reduction of the spermatozoa [22] below the contraceptive threshold considered to be effective. This contraceptive threshold was defined in 2007 for male thermal, chemical and hormonal contraception methods. It corresponds to 1 million spermatozoa per milliliter per ejaculate. [23] [24] [25]
Time-domain thermoreflectance (TDTR) is a method by which the thermal properties of a material can be measured, most importantly thermal conductivity. This method can be applied most notably to thin film materials (up to hundreds of nanometers thick), which have properties that vary greatly when compared to the same materials in bulk. The idea ...
François Marcel marcelling his wife's hair, 1922. Marcelling is a hair styling technique in which hot curling tongs are used to induce a curl into the hair. [1] [2] Its appearance was similar to that of a finger wave but it is created using a different method.
The Lock-In method is suitable for testing components with a low thermal diffusivity and it has many modifications for various specific applications (such as Lock-In Ref, Lock-In Online, etc.). Pulse thermography (pulse method). A very short pulse – usually in the units of milliseconds – is used to excite the object. The cooling process is ...
Thin-cut chicken cutlets are key for getting dinner on the table quickly. View Recipe. Chicken Hummus Bowls. The spiced chicken atop these bowls is ready fast with the help of the broiler. Serve ...
A variant of the metric perm is used in DIN Standard 53122, where permeance is also expressed in grams per square meter per day, but at a fixed, "standard" vapor-pressure difference of 17.918 mmHg. This unit is thus 17.918 times smaller than a metric perm, corresponding to about 0.084683 of a U.S. perm.