Hook closure

Figure 4.20.A shows a more recent cell reported by Cobben et al. It consists of three Perspex blocks, of which two (A) are identical and the third (B) different. Part A is a Perspex block (1) furnished with two pairs of resilient hooks (3) for electrical contact. With the aid of a spring, the hooks press at the surface of the sensor contact pads (4), the back side of which rests on the Perspex siuface, so the sensor gate is positioned in the centre of the block, which is marked by an engraved cross as in the above-described wall-jet cell. Part B is a prismatic Perspex block (2) (85 x 24 x 10 mm ) into which a Z-shaped flow channel of 0.5 mm diameter is drilled. Each of the wedges of the Z reaches the outside of the block. The Z-shaped flow-cell thus built has a zero dead volume. As a result, the solution volume held between the two CHEMFETs is very small (3 pL). The cell is sealed by gently pushing block A to B with a lever. The inherent plasticity of the PVC membrane ensures water-tight closure of the cell. The closeness between the two electrodes enables differential measurements with no interference from the liquid junction potential. The differential signal provided by a potassium-selective and a sodium-selective CHEMFET exhibits a Nemstian behaviour and is selective towards potassium in the presence of a (fixed) excess concentration of sodium. The combined use of a highly lead-selective CHEMFET and a potassium-selective CHEMFET in this type of cell also provides excellent results.

The electrode type was a source of complaint for two participants because it was painful to remove them. Another cause of major complaints was the use of hooks and eyes for garment closure. They were difficult to see, and most women tended to... 

The ANSI/ISEA 107-2010 Class 2 vest is made from 8,4 cal/cm arc rated Tecasafe Plus fabric, is constructed with an inside chest pocket for storage, plus breakaway hook and loop closures on both the shoulders and front for added safety. 

On the right-hand side of the belt the hook-and-loop fastener is inserted to close the medical back belt. Velcro closures are frequently used in orthopaedic devices because they can be employed very easily. Most of the orthopaedic devices have to be custom-made because they have to ht very precisely. With a Velcro closure the medical back belt can be closed individually, and only general sizes like s, m, 1, xl and xxl have to be produced. The whole construction of the outer and inner surface is shown in Fig. 6.4. 

Closures and location of fasteners. The closures (eg, pockets, cuffs, collar) and location of fasteners (eg, hooks, loops, buttons) are important because these help to trap air inside a garment and help to provide a microclimate between the clothing and the wearer. A large number of closures/fasteners or poorly sealed closures may disturb the microclimate environment and lower the thermal insulation of clothing (Crown et al., 1998 Lawson et al., 2004). 

Zippers are nothing short of miraculous when they function properly. When they jam or break in public, however, our love affair generally cools. But don t default to snaps. Velcro, or hook-and-eye closures simply because you re intimidated by zippers. It s not rocket science. It just takes a little practice. For your first-time zipper projects, try to choose a zipper with a slider on the smallish side. They re easier to deal with because they re less bulky. Also, do your best to match the length of the zipper with the length of the opening in your project. 

FR safety vests Cordova Safety s new FR safety vests are constructed of chemically treated polyester mesh fabric that meets the flame resistance requirements of NFPA 701. The vests are available in a standard design with hook and loop closure as well as a 5-point breakaway design. Both models include silver retro-reflective tape and comply with Class... 

Rattler features interchangeable bayonet temples and an adjustable head-band with each pair. A unique feature of the headband with hook-and-loop closure is the ability to adjust with one hand while wearing. The 3-position ratcheting bayonet temples also feature full length, non-slip TRP temple sleeves for comfort and grip. A closed cell foam seal on the inside of the lens provides optimum protection from dust and debris. Contact MCR Safety at (800) 955-6887 or visit www.mcrsafety.com. Circle 275... 

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