Breakage

Precautions Students should carefully note the following points in order to minimise breakages. 

This is simUar to (a) except that it is provided with a ring neck, which increases the mechanical strength, prevents breakage when a stopper is inserted, and provides a means for wiring a stopper in place. The upper rim is ground flat. 

The elimination of the liquid baths and, in consequence, the absence of burns due to accidental breakage of the ordinary glass apparatus. 

The Fischer cyclization is usually carried out with a protic or Lewis acid which functions both to facilitate the formation of the cnchydrazine by tautomerization and also to assist the N N bond breakage. The mechanistic basis of the Fischer cyclization has been discussed in recent reviews[l,2]. 

For example, a thiazole-cyclohexane solution at 25 C is less viscous than the ideal system, and the deviation from ideality can be explained assuming that in solution there is a breakage between the existing association of the thiazole molecules in pure state (157). 

Particle board adhesives Particle bonding Particle breakage Particle distribution Particle filtration... 

Specific breakage rate Specific conductivity Specific ion electrode Specific properties... 

The type of floe requited depends on the separation process which foUows, eg, rotary vacuum filtration requites evenly sized, smaU, strong floes that capture ultrafines to prevent cloth blinding and cloudy filtrates. The floes should not be subject to sedimentation in the vat or breakage by the agitator. 

Deteriora.tlon. An important source of damage to stone objects is mechanical in nature. Both breakage and abrasion account for much of the losses on objects made of this relatively fragile material. More difficulties are offered by the processes of a chemical nature which play a role in stone deterioration (132—134). 

Deteriora.tlon. Ceramic objects are fragile, and mechanical damages through breakage and abrasions are the most likely source of destmction. Low fired ceramics can suffer through the rehydration of the body material this process results ia a complete loss of mechanical streagth. The preseace of soluble salts ia porous ceramic bodies has the same disastrous results as ia stoae (136). 

DDT is highly toxic to fish (LC q for trout and blue gill, 0.002—0.008 ppm), and it is only moderately toxic to birds (oral LD q mallard 1300 and pheasant >2240 mg/kg). However, widespread bird kills have resulted from bioconcentration of DDT through food chains, ie, from fish or earthworms. A significant environmental problem has resulted from the specific effects of DDE on eggshell formation in raptorial birds where accumulation has caused decreases in shell thickness of 10—15%, resulting in widespread breakage. 

Fig. 1. Wind-load data for he at-strengthened and laminated 3.2-mm glass. Architect s specified probabiUty of breakage is 8/1000 laminates for a 1-min uniform wind-load duration. Four sides supported in weathertight rabbet. Curves for different glaring areas A, 0.93 m (10 ft ) B, 1.39 m (15 ft ) C, 1.86...

Briquettes must be transported carefliny to avoid breakage. They ate usually dumped into piles in sheds and frequently ate screened to remove smaller broken particles. Hand-stacking significantly improves storage quaHty, and permits mote material to be stored in a limited volume. 

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