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The solvents of this class are usually of high permittivity (er > 20) and of fair or strong acidity (proton donor capacity) and basicity (proton acceptability) [4]. Water is the most important solvent in this class. In water, the HA- and BH+-type acids dissociate as in Eqs (3.1) and (3.2): HA H2 O 3 H3 O A 2 BH H2 O 3 H3 O B 2 3:1 3:2

situations in which sales temporarily run faster than the firm can produce output. The target level is determined by the costs and benefits of having a bigger or smaller inventory on hand. Having less inventory than the target level is dangerous because the firm may not be able to keep up with sales spikes. Having more inventory than the target level is wasteful because there s no point in having stuff sitting around unsold, year after year. Each firm weighs these costs and benefits to come up with its own target inventory level. Target inventory levels may vary from year to year depending on whether firms are expecting strong or weak sales. If managers are expecting strong sales, they may plan on increasing inventories, whereas if they are expecting weak sales, they may plan on decreasing inventories. Keynes realised that aggregate demand shocks (which are, by definition, unexpected) would show up as unexpected changes in firm inventories. Unexpectedly low aggregate demand means that sales slow so much that inventories increase and reach levels higher than firms had planned on. Unexpectedly high aggregate demand means that sales increase so much that inventories decrease and reach levels lower than firms had planned on.

Assuming that you do not want to help develop a product for a third party, ask for and check all references given. However, take these with a grain of salt: No one

the front focal point of the objective, while the intermediate image is located at a distance 10 100 times the focal length of the objective in the eyepiece. For more detailed discussions on the topic, refer to Pluta (1988) or Hecht (1998). Modern microscopes with infinity focus objective lenses follow the same optical principles already described for generating a magnified real image, only the optical design is somewhat different. For an objective with infinity focus design, the specimen is located at the focus of the lens, and parallel bundles of rays emerging from the back aperture of the lens are focused to infinity and do not form an image; it is the job of the tube lens in the microscope body to receive the rays and form the real intermediate image at the eyepiece. The advantage of this design is that it allows greater flexibility for microscope design while preserving the image contrast and resolution provided by the objective. Items such as waveplates, compensators, DIC prisms, reflectors, and fluorescence filter sets can be placed anywhere in the infinity space between the back of the objective and the tube lens. As long as these items have plane-parallel elements, their location in the infinity space region of the imaging path is not critical. If we consider the combination of objective plus tube lens as the effective objective lens, then the same optical rules pertain for generating a real magnified image and we observe that the relationship 2f a f is still valid. Sketches showing the infinity space region and tube lens in upright and inverted microscopes are shown in Color Plates 4-1 and 4-2. The function of the eyepiece or ocular is to magnify the primary image another 10-fold, and together with the lens components of the eye, to produce a real magnified image of the intermediate image on the retina. Thus, the object of the eyepiece is the intermediate image made by the objective lens. Note that in the case of the ocular, 0 a f, so the object distance is less than one focal length, resulting in a virtual image that cannot be focused on a screen or recorded on film with a camera. However, when the eye is placed behind the eyepiece to examine the image, the ocular-eye combination produces a real secondary image on the retina, which the brain perceives as a magnified virtual image located about 25 cm in front of the eye. The visual perception of virtual images is common in optical systems. For example, we also see virtual images when we employ a handheld magnifying glass to inspect small objects or when we look into a mirror.

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