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A textbook of inorganic chemistry vol.IX part II Iron and

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On washing, detergents and washing machines: E. Smulders Laundry Detergents, Wiley VCH 2002. Appendix 4-1 Detergent Requirements6 In this file we estimate the amount of detergent required for a single wash in a washing machine. Starting point is the structure of textile in Figure 4-7. The solid part ‘4’ of the textile consists of fibres with a diameter of ten micrometres: d4 := 10 · 10−6 · m m4 := 5 · kg The mass of textile for a full wash is: If we consider than to be cylinders, they have a surface area ρ4 := 1400 · kg · m−3 m4 V4 := ρ4 4 A4 := V4 · d4 The diameter of the surfactant ‘5’ is (Figure 1-5 in ‘Colloids’).

Most of this has to be done by team members: computer database systems can help, but will not do the difficult part of bringing structure in the information. This can be a real problem towards the end of a project. 22 Our Phases Figure 3-4 Knowledge explosion in a project Gates (Milestones) Back to our diagram. Between the phases is a point where decisions are taken whether to go on or not – or whether the team needs to change direction. Such points are called gates or milestones (Figure 3-5). A gate has to be opened to go on: at each gate, something must be finished.

A. Wesselingh, Lesson 5: Find Needs Figure 5-2 A twenty-year old Attica window However, you may expect other comments from your customers, and must try to take these into account. The window consists of two layers of glass, separated by a layer of stagnant argon (Figure 5-3). The glass layers are separated by an aluminium strip and glued to this strip by a polymer sealant. To improve the product, you will have to know your customers and what they need. When you have found the needs, they have to be translated into the product, via product specifications.

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