Mechanical breakdown

These pumps cannot effectively handle condensation of vapors inside the unit, because the capacity is reduced and the condensate creates lubrication problems, which in turn leads to mechanical breakdown. 

Report on manning levels and time lost due to weather, mechanical breakdowns, labour disputes, etc. 

Sudden and unforeseen damage, which will include, in addition to the electrical and mechanical breakdown. 

Lead is a toxic metal and rigid precautions against lead poisoning are essential. Sprayed lead is, like other sprayed metals, porous, and the sprayed layers will not as a rule withstand attack by strong acids. On the other hand, lead from 0-13 to 0-25 mm (0-005 to 0-01 in) in thickness has proved extremely useful in atmospheres containing sulphuric acid. In this case the pores in the lead become blocked with lead sulphate, with the result that complete protection is assured. In the event of mechanical breakdown, lead does not exhibit any sacrificial action and therefore corrosion may lift the lead layer. 

System faults fall into two general classes the sudden catastrophe of a mechanical breakdown and the slow fall-off of performance which can be detected as a malfunction in its early stages but will also lead to a breakdown if not rectified. Identification of the first will be obvious. To track down the cause of a malfunction will be more complicated. 

Mandelbrot, on fractal surfaces, 52 Mao and Pickup, their work on the oxidation of polypyrrole, 587 Marcus model, inapplicability for interfacial electron transfer, 513 Mechanical breakdown model for passivity, 236... 

Chemical, semichemical, or mechanical breakdown of pulping material into fibers Removal of pulp impurities, cleaning and thickening of pulp fiber mixture Addition of chemicals in a staged process of reaction and washing increases whiteness and brightness of pulp, if necessary At nonintegrated pulp mills, pulp is dried and bundled into bales for transport to a paper mill... 

A device designed to determine the transport of an epidermal growth factor from a Pluronic gel, a Carbopol gel, and a vanishing cream base was shown capable of demonstrating formulation-dependent release kinetics [22], This device consists of a release cell which has a membrane to minimize release due to mechanical breakdown and is placed in a stirred and temperature-controlled receptor fluid. 

The mouth is the region from the lips to the pharynx. The first step in the digestive process is chewing, or mastication, which is an initial mechanical breakdown of the food that facilitates its movement to the stomach. The mouth is lined with stratified squamous epithelium that provides extra protection from injury by coarse food materials. Three pairs of salivary glands secrete saliva into the oral cavity ... 

Increasing the temperature frequently leads to better wetting, while the reverse is true for the mechanical breakdown of agglomerates. Similar observations have been made regarding the effect of wetting and dispersion agents [73]. 

Poor housekeeping may increase the failure or breakdown of electrical and mechanical equipment. Even without considering the possibility of a resulting fire or explosion, electrical and mechanical breakdowns can result in damage or destruction of major pieces of equipment or injury to personnel. Poor housekeeping can lead to breakdowns in the following ways ... 

Weathering is the process by which rock is broken down into smaller and smaller particles. It involves both mechanical and chemical breakdowns. The mechanical breakdown into smaller and smaller pieces occurs as a result of exposure to freeze-thaw cycles and to the action of wind and water. Chemical breakdown occurs as a result of exposure to air and water and other chemicals that may be dissolved in water, such as acids. Weathering by exposure to atmosphere results in some of the carbon dioxide being removed from the atmosphere along with the broken-down rock and eventually washed into the ocean. 

Notwithstanding the emphasis placed on tanks by Churchill, Fuller and Liddell Hart, this notable British invention had its limitations. British tanks first went into action on 15 September 1916, only nine months after the trials of the first practical machine, and before the inevitable teething problems had been eliminated. French tanks were developed independently but did not see action for another seven months, and the first two types of chars de combat were inferior to the British Mark I in their ability to cross obstacles. The first German tanks did not appear in action until 1918 and again cross-country performance was poor. The British Mark I was prone to mechanical breakdowns, especially on broken ground, as on the Somme battlefield. 

The addition of tellurium has a deoxidizing action and confers on lead useful work and precipitation-hardening properties. It also improves resistance to wear, vibration, and mechanical breakdown. These properties, along with improved corrosion resistance, are utilized in the sheathing of power communication and marine cables, in chemical equipment (especially those exposed to sulfuric acid), or where resistance to fatigue is important. Tellurium has successfully replaced tin (1—3% Sn) in the sheathing. Thinner sheaths can be extruded, and the extrusion pressure for 0.05% Te-beafing lead is about the same as for a 3% Sn alloy. 

Physical weathering The mechanical breakdown of rocks into smaller fragments, which then contribute to the formation of soils and sediments (compare with chemical weathering and weathering). 

The extraction and solubilization of various constituents. It is promoted by the enzymatic and mechanical breakdown of plant tissues, especially the skin. 

The presence of free radicals deriving from carbon black could also complicate the interpretation of NMR data in the case of filled rubbers, because radicals may cause a substantial decrease in T2. Two types of radicals have been detected in carbon-black-filled rubbers localised spins attributable to the carbon black and mobile spins deriving from rubbery chains [86]. Mobile spins are formed because of the mechanical breakdown of polymer chains when a rubber is mixed with carbon black. The concentration of mobile spins increases linearly with carbon black loading [79, 87]. 

Use of every interruption in drilling (e.g., weekends or mechanical breakdowns) to measure the water table, temperature, and... 

In the discussion of E the vs pH diagram for iron in water depicted in Figure 1.70, we noted that, with application of high positive potentials, the system moves into a region of passivity and results in a reduced corrosion rate. The passive film formed should be coherent and insulating to withstand corrosion and mechanical breakdown. Upon formation of the passive state the corrosion rate is reduced. Thus by polarization and applying more positive potentials than corrosion potentials the metal attains passivity and is protected. This is the principle of anodic protection. It is necessary that the potential of passivation be maintained at all times, since deviations outside the range would result in severe corrosion. 

Surface films appear to play a major role in the initiation of SCC and may also contribute to hydrogen embrittlement effects. It is assumed that the main role of the surface film is to localize the damage inflicted on the material by the environment. This can be caused by mechanical breakdown of the protective film by slip step or electromechanical breakdown of the passive film.95 SCC may be related to the nature of the surface film. It has been observed that the SCC of C-Steels is related to the presence of magnetite in several low -temperature environments (around 90°C), except... 

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