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lateral shift of the image. The instrument used to perform this procedure, is called an optical nodal slide bench (Kingslake, 1932). The use of a nodal slide is described in 11: Star test in this book. Besides a precise measurement of the focal distance, one can measure of others parameters like aberrations. A nodal slide bench can be used also for measurements of re ecting surfaces (Cornejo-Rodr guez and Cordero-Davila, 1980) and even toric surfaces (D az Uribe et al., 1986). 17.5.2. Focimeters A focimeter is an instrument designed to measure the focal length of lenses in a simple manner. It is a commonly used instrument by optometrists. Actually, a focimeter or vertometer measures the back focal length or vertex power. A typical focimeter is shown in Figure 17.18(a). When there is no lens in the measuring position (Zero dioptric power), a light source illuminates a target (reticle) and a convergent lens with focal length f is placed at a distance x from the reticle. The reticle is imagined at in nity and a telescope permits the observation of the target at that position. The lens to be measured is placed at a distance d from the converging lens (Fig. 17.18b). The position of the target x is variable, and is adjusted until the light beam going out from the lens under test becomes collimated. This collimation is veri ed by means of the small telescope in front of this lens, focused to in nity. The values of d and the focal length f are chosen to be equal. Then, the back focal length fb of the lens under test is given by thin lens formula: 1 1 x Pv fb d d 2 17:5

On platforms such as Windows, which provide a usable wide character type (wchar_t), Python uses this type and its supporting functions for better performance and compatibility. PyUnicode_GET_SIZE(PyObject *o) returns the number of characters in the string, and PyUnicode_GET_DATA_SIZE(PyObject *o) returns the number of

he optical drive has become a basic ingredient in personal computers Without at least a CD-ROM drive, it s almost impossible to install basic items like the operating software and any programs you want to use The vast majority of computers come not just with a CD-ROM drive, but a CD-RW (read and write) drive, often one that can also access DVDs For the more advanced users reading this book, DVD/CD-RW devices are not unfamiliar, either In an HTPC, a DVD drive of some kind is an absolute necessity You must be able to play DVD movies at the very least You may also want to make DVD copies of home movies, programs recorded from TV, or backups of material that is already on DVD.

results are routed to an NM via the EM, then it is necessary for the EM to retain the data at least until they have been successfully transferred to the NM Typically, the measurement results produced by network elements are transferred to an external NMS for storage, post-processing and presentation to the system operator for further evaluation Generally, the di erentiating factor between an EM and NM function is related to the amount of data The reporting functions at the NMS level contain information from a multitude of network elements network-wide The requirement of being network-wide can limit the usability of certain data sources, because there are numerous data sources that do not provide naturally network-wide data (eg, eld measurement tools) In addition to network-wide highly summarised data, an NMS system supports drilldown functionalities, in order to zoom in to the needed details (eg.

Prolonged outdoor exposure of all organic polymeric materials leads to appearance changes, such as loss of gloss, formation of surface crazes and cracks, chalking, yellowing and fading, as well as to breakdown of mechanical properties, including impact strength, tensile strength, and elongation, properties that are particularly important in some applications. However, environmental stabilities of commercial polymeric materials differ widely because of (1) differences in their chemical structures and thus in both their absorption properties and resistance to

, in troubleshooting cases) Summarisation can be done in terms of elements/objects, time or the measurement content Element level summarisation provides averaged reports on network elements, such as RNC level KPI reporting Time axis summarisation provides, for example, daily average or busy hour KPIs, instead of collecting values individually from NEs Measurement content summarisation is related to the grouping of measurements In high-level reports, for example, the handover performance gure is presented as one value In the case of poor handover performance, support is o ered to zoom in to the details of di erent handover types The power of an NMS lies in the fact that large amounts of data are available, and di erent views of such data can be provided If the scope is the whole network (high numbers of objects), then it is obvious that the detail level of data in the report is small.

Functions for adding and removing elements These include array_unshift(), array_ shift(), array_push(), array_pop() and array_splice()