a portable oxygen concentrator is a device used to provide oxygen therapy to people that require greater oxygen concentrations than the levels of ambient air. it is similar to a home oxygen concentrator, but is smaller in size and more mobile. they are small enough to carry and many are now faa-approved for use on airplanes.
a portable computer is a computer designed to be easily moved from one place to another and included a display and keyboard. the first commercially sold portable was the 50-pound 23 kg ibm 5100, introduced 1975.the next major portables were osborne's 24-pound 11 kg cp/m-based osborne 1 1981 and compaq's 28-pound 13 kg ibm pc compatible compaq portable 1983 .
a new fire-extinguisher system for protection against napalm was installed after an analysis of WPCed fighting vehicle afv usage during the vietnam war. there is an additional machine gun firing port on the left side of the hull and at the front of the turret, increasing the number of firing ports from seven to nine.
a roof seamer is a portable roll forming machine that is used to install mechanically seamed structural standing seam metal roof panels, as part of an overall metal construction building envelope system. the machine is small and portable to be handled by an operator on top of a roof. the machine is applied to the overlapping area when two parallel roof panels meet.
a boilerplate spacecraft, also known as a mass simulator, is a nonfunctional craft or payload that is used to test various configurations and basic size, load, and handling characteristics of rocket launch vehicles.it is far less expensive to build multiple, full-scale, non-functional boilerplate spacecraft than it is to develop the full system design, test, redesign, and launch .
in the case of a machine with field coils, a current must flow in the coils to generate the field, otherwise no power is transferred to or from the rotor. the process of generating a magnetic field by means of an electric current is called excitation. field coils yield the most flexible form of magnetic flux regulation and de-regulation, but at .
the portable executable format is a file format for executables, object code, dlls and others used in 32-bit and 64-bit versions of windows operating systems. the pe format is a data structure that encapsulates the information necessary for the windows os loader to manage the wrapped executable code. this includes dynamic library references for linking, api export and import tables, resource management data and thread-local storage data. on nt operating systems, the pe format is used for exe, dl
the main advantage of the jet nebulizer is related to its low operational cost. if the patient needs to inhale medicine on a daily basis the use of a pmdi can be rather expensive. today several manufacturers have also managed to lower the weight of the jet nebulizer down to 635 grams 22.4 oz , and thereby started to label it as a portable .
portability in high-level computer programming is the usability of the same software in different environments. the prerequirement for portability is the generalized abstraction between the application logic and system interfaces.when software with the same functionality is produced for several computing platforms, portability is the key issue for development cost reduction.
portable ultrasound. portable ultrasound is a modality of medical ultrasonography that utilizes small and light devices, compared to the console style ultrasound machines that preceded them. in most cases these mobile ultrasound systems could be carried by hand and in some cases even operated for a time on battery power alone.
the first known crane machine was the shadouf, a water-lifting device that was invented in ancient mesopotamia modern iraq and then appeared in ancient egyptian technology. construction cranes later appeared in ancient greece, where they were powered by men or animals such as donkeys , and used for the construction of buildings.
a cassette deck is a type of tape machine for playing and recording audio cassettes.the consumer electronics industry formerly used the term deck to distinguish them from a tape recorder, the 'deck' being part of a stereo component system, while a 'tape recorder' was more portable and usually had a self-contained power amplifier and often speakers . .
parallels desktop for mac is a hardware emulation virtualization software, using hypervisor technology that works by mapping the host computer's hardware resources directly to the virtual machine's resources. each virtual machine thus operates identically to a standalone computer, with virtually all the resources of a physical computer.
etymology. the word torpedo comes from the name of a genus of electric rays in the order torpediniformes, which in turn comes from the latin torpere 'to be stiff or numb' . in naval usage, the american robert fulton introduced the name to refer to a towed gunpowder charge used by his french submarine nautilus first tested in 1800 to demonstrate that it could sink warships.