Thumb test

Other in vitro methods include the determination of the weight needed to break the adhesion [41], the fluorescent probe [35], the flow channel [42], mechanical spectroscopy [43], the falling film [44], colloidal gold staining [45], viscometiy [46], the thumb test [47], the adhesion number [47], and electrical conductance [47]. 

Additional in vitro methods include adhesion weight, fluorescent probe, " flow channel,mechanical spectroscopic, falling film, colloidal gold staining, viscometric method, thumb test, ... 

These techniques involve the analysis of the changes in the chemical and physical properties of a molded specimen as a function of temperature. They are not generally used for production or quality control but are quite useful in resolving problems that could be the result of insufficient cure and that are not readily detected by the more common visual or chemical tests. There is a rule-of-thumb test procedure that is a fairly reliable cure test, and it is based upon a visual inspection of the molded article for obvious defects such as... 

For many projects, a basis set cannot be chosen based purely on the general rules of thumb listed above. There are a number of places to obtain a much more quantitative comparison of basis sets. The paper in which a basis set is published often contains the results of test calculations that give an indication of the accuracy of results. Several books, listed in the references below, contain extensive tabulations of results for various methods and basis sets. Every year, a bibliography of all computational chemistry papers published in the previous... 

The work index may be round experimentally from laboratoiy crushing and grinding tests or from commercial miU operations. Some rules of thumb for extrapolating the work index to conditions different from those measured are that for dry grinding the index must be increased by a factor of 1.34 over that measured in wet grinding for open-circuit operations another factor of 1.34 is required over that measured in closed circuit if the product size Xp is extrapolated below 70 [Lm, an additional correction factor is (10.3 + Xp)/l.l45X . Also for a jaw or gyratory crusher the work index may be estimated from... 

First, one must estimate air or other gas leakage into the vacuum system. Of course every effort is made to keep it as tight as possible. The author is aware of possible leak points being sealed with polystyrene, which produces an excellent seal. When tests cannot be made, one must use rules of thumb. Many such rough estimating techniques exist. 

Finger test. This is the most simple test. A small amount of adhesive is placed on a finger and pressed against the thumb. The difficulty to separate the finger and thumb provides a rough estimation of tack. 

A rule of thumb has been developed after a large number of analytes were tested. Once the selectivity was observed on the coupled column, a baseline separation can always be achieved on a 25 cm column under optimized conditions. Since the screening procedure already indicates the separation conditions, optimization is straightforward and requires a minimum amount of time. 

The thumb-web area, referred to in the above procedure is the V-shaped section formed by the surfaces on the back of thumb, the trigger finger and the area between the thumb and trigger finger. Controlled firing tests show that the bulk of the gunshot residues are deposited on this area of the back of the hand... 

Builders should be aware that wells can be a potential problem. The only way to ensure that a well is not a potential radon source is to have the water tested after the well is drilled. It is not adequate to make a decision based on tests made in wells in the same area or even on adjoining building sites. A recent research project disclosed two homes with water radon concentrations of over 400,000 pCi/L, while the well used at a house between the two had waterborne radon concentrations of less than 1000 pCi/L.18 It should be understood that, when considering waterborne radon, the concentrations that concern us are much higher than when we are considering radon in the air. As a rule of thumb, between 8000 and 10,000 pCi/L of radon in the water will contribute 1 pCi/L of radon to the air. 

Radon dissolves into groundwater from rocks or soils. When the water is exposed to the atmosphere, some of the dissolved radon is released. As a rule of thumb, there is an increase of about 1 pCi/L in the air inside a house for every 10,000 pCi/L of radon in the household water.50 Higher radon levels have been observed in individual rooms when water is heated or agitated, such as during shower use.51 Builders should be aware that houses require groundwater as the house water supply could have a radon problem. The only way to be certain that the groundwater is not a potential radon source is to have the water from the well tested. Some states and private companies provide test kits for this purpose. It should also be noted that radon concentrations in water, like radon concentrations in the air, can vary significantly. 

This means that, to obtain the least variance in a multistage calculation, the intermediates should be constructed to have equal entropy difference for all stages. This criterion differs from the often used but unjustified rule of thumb that free energy differences should be equal in all stages [22,42], Simulation tests show that the entropy criterion leads to a great improvement in calculation precision compared to its free energy counterpart [26]. The same optimization criterion holds for calculation of entropy and enthalpy differences [44],... 

Dough development is a fundamental process in bread making, without it there is just a paste of flour, water and the other ingredients. If the bread is to expand and form a proper cell structure then this change must take place. While it is quite easy to test for dough development by prodding some dough with a thumb it is more complicated at a chemical level. 

Concerning the hydrodynamics and the dimensioning of the test reactor, some rules of thumb are a valuable aid for the experimentalist. It is important that the reactor is operated under plug-flow conditions in order to avoid axial dispersion and diffusion limitation phenomena. Again, it has to be made clear that in many cases testing of monolithic bodies such as metal gauzes, foam ceramics, or monoliths used for environmental catalysis, often needs to be performed in the laminar flow regime. 

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