Withdrawal from

A decrease of a- and tt-electronic density in both adjacent positions. For the a system this decrease is approximately the same at the 2- and 4-positions, which expresses an equivalent electron withdrawing from nitrogen in both positions. On the other hand, the decrease in tr-electronic density is twice as large at C-2 as at C-4. [Pg.35]

Withdrawal from anaboHc steroid treatment is not required before slaughter because residue levels in edible tissues are negligible, and are significantly lower than other sources of estradiol such as the normal endogenous production in humans and the phytoestrogens consumed in plant food sources (1). [Pg.409]

Milk consists of 85—89% water and 11—15% total soflds (Table 1) the latter comprises soflds-not-fat (SNF) and fat. Milk having a higher fat content also has higher SNF, with an increase of 0.4% SNF for each 1% fat increase. The principal components of SNF are protein, lactose, and minerals (ash). The fat content and other constituents of the milk vary with the animal species, and the composition of milk varies with feed, stage of lactation, health of the animal, location of withdrawal from the udder, and seasonal and environmental conditions. The nonfat soflds, fat soflds, and moisture relationships are well estabhshed and can be used as a basis for detecting adulteration with water (qv). Physical properties of milk are given in Table 2. [Pg.350]

Mutual Exclusion (MUTEX). The idea of multiple entities all working on the same piece of work raises this issue of coordination and communication among the individual processes. A weU-known example from banking is instmctive. Consider two bank tellers simultaneously performing withdrawals from the same bank account. Both read the account balance and determine that the balance is 100, and so a withdrawal of 100 is allowed. Both then withdraw 100 from the account. Clearly this process needs some means by which the actions of the independent processes can be synchronized and coordinated. [Pg.94]

Char-liquor advance is simply the removal of mother Hquor from the crystallizer without simultaneous removal of crystals. The primary objective of fines removal is preferential withdrawal from the crystallizer of crystals whose size is below some specified value. Such crystals may be redissolved and the resulting solution returned to the crystallizer. Classified-product removal is carried out to remove preferentially those crystals whose size is larger than some specified value. [Pg.351]

Union Carbide introduced the first commercial polyarylsulfone resin, Udel, in 1966 and later introduced Radel polyarylsulfone. The business and patents rights were acquired by Amoco Corp. in 1986. Other polysulfone products have been marketed by BASF and ICl (Victrex PES) the latter aimounced in 1991 it was withdrawing from the business. [Pg.271]

Amoco Performance Products (Atlanta, Ga.), is the sole supplier of polysulfone, Udel, polyarylsulfone, Radel A, and polyphenylsulfone, Radel R. ICI Advanced Materials (Exton, Pa.), is the sole domestic supplier of the polyethersulfone, Victrex PES, but announced ia 1991 it was withdrawing from the business. [Pg.272]

The U.S. price history for merchant ethylene oxide sales is shown in Figure 4. It can be seen that ethylene oxide pricing generally reflects the cost of ethylene and, of course, supply/demand forces. In the late 1980s, several U.S. producers announced their withdrawal from the merchant ethylene oxide market. [Pg.462]

For a vacuum pump of speed withdrawing from a vacuum vessel through a connecting line of conductance C, the pumping speed at the vessel is... [Pg.641]

Feed or withdraw from both ends, reducing the pipe flow velocity head and required hole pressure drop by a factor of 4. [Pg.658]

Sample Withdrawal from Process A number of considerations are involved in the design of sample-withdrawal devices that wih provide representative samples. For example, in a horizontal pipe that conveys process fluid, a sample point on the bottom of the pipe wih collect a maximum amount of rust, scale, or other solid materials being carried along by the process fluid. In a gas stream, such a location will also collect a maximum amount of liquid contaminants. A sample point on the top side of a pipe will, for liquid streams, collec t a... [Pg.766]

Sample Transport Transport time, the time elapsed between sample withdrawal from the process and its introduction into the analyzer, shoiild be minimized, particiilarly if the analyzer is an automatic analyzer-controller. Any sample-transport time in the analyzer-controller loop must be treated as equivalent to process dead time in determining conventional feedback controller settings or in evaluating controller performance. Reduction in transport time usually means transporting the sample in the vapor state. [Pg.767]

Table 2 Examples of drugs and period of withdrawal from animals prior to use as food ...

If HjS is continuously present in the flare gas or if the flare seal drum also functions as a sour water disengaging drum, then the effluent seal water must be routed to a sour water stripper, desalter, or other safe means of disposal. Withdrawal from the drum is by pump in place of the normal loop seal arrangement. Two pumps are provided one motor driven for normal use, and the other having a steam turbine drive with low pressure cut-in. The seal drum level is controlled by LIC with high and low alarm lights plus an independent high level alarm. [Pg.276]

There are two types of external documents, those in the public domain and those produced by specific customers. In some cases the issues of both types of documents are stated in the contract and therefore it is important to ensure that you possess the correct version before you commence work. Where the customer specifies the issue status of public domain documents that apply you need a means of preventing their withdrawal from use in the event that they are revised during the term of the contract. Where the issue status of public domain documents is not specified you may either have a free choice as to the issue you use or, as is more likely, you may need to use the latest issue in force. Where this is the case you will need a means of being informed when such documents are revised to ensure that you can obtain the latest version. The ISO 9000 series for instance is reviewed every five years, so could well be revised at five-year intervals. With national and international legislation the situation is rather different as these can change at any time. You need some means of alerting yourself to changes that affect you and there are several methods from which to choose ... [Pg.288]

Storage tanks should, wherever possible, be installed above ground. The site selected should not be in an unduly exposed position. Clearance must be allowed for the withdrawal from the tank of fittings such as immersion heaters and steam coils. Where tanks are installed inside buildings, they should generally be located within a tank chamber, although in some industrial installations such as steelworks and foundries, a tank chamber may not be necessary. The requirements of insurance companies and local authorities should be considered when designing these installations. [Pg.255]

A sufficient number of specimens should be exposed initially to permit their withdrawal from test in appropriate groups, for example 3 to 5 duplicates after at least three time intervals. For long-time tests, a suitable schedule would call for removals after 1, 2, 5, 10 and 20 years. [Pg.1069]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...