摘要:
This process for preparing L .alpha.-amino-acid is characterized in that the corresponding racemic .alpha.-amino-acid is hydrolysed in liquid phase in a free form or in the form of a salt, by an agent containing an L-stereospecific amidase and in that the L .alpha.-amino-acid obtained is separated from the D .alpha.-amino-amid unhydrolysed. This process is appropriate for the preparation of optically active natural amino-acids.
摘要:
The present invention relates to a process for the preparation of amides.This process for the preparation of an amide by hydrolysis of the corresponding nitrile is characterized in that the said nitrile in aqueous solution is subjected to the action of bacteria having a nitrilasic activity, in that the pH of the said aqueous solution is maintained at a value at least equal to the limiting pH of the amide hydrolysis reaction, and in that the bacteria mass is separated from the amide solution.This process is useful in particular for the preparation of acrylamides.
摘要:
The present invention relates to a process for the production of organic acids by biologically hydrolysing the corresponding nitriles.This process is distinguished by the fact that the nitrile in aqueous solution is subjected to the action of bacteria showing nitrilasic activity, preferably selected from the species: Bacillus, Bacteridium as defined by Prevot, Micrococcus and Brevibacterium as defined by Bergey.The process according to the invention can be used in particular for the production of racemic lactic acid.
摘要:
A glazing coated with at least one layer having thermochromic properties comprising vanadium oxide, and also with at least one other layer having thermal properties, such as an infrared reflecting layer, and/or at least one other layer having optical properties, such as antireflection in the visible, and/or electrical conduction properties; and having a particular application for making solar control glazing.
摘要:
In an electrical connection for high-voltage or medium-voltage switchgear, a bar (2) is inserted in a recess (6) provided with a projection (10). In the invention, the dimensions are established so that the axes (AA, BB) of the bar (2) and of the projection (10) can be inclined relative to each other. Spring-forming conductor elements (12, 14) establish the electrical connection even in the event of tilt. A high-performance electrical contact can thus be obtained compactly, which makes it possible to perform assembly/disassembly operations on electrical equipment without any additional element of the telescopic ferrule or separable bar type.
摘要:
A method for generating look-up tables for a high speed multi-bit Real-time Deterministic Finite state Automaton (hereinafter RDFA). The method begins with a DFA generated in accordance with the prior art. For each state in the DFA, and for each of the bytes recognized in parallel the following occurs. First an n-closure list is generated. An n-closure list is a list of states reachable in n-transitions from the current state. Next an alphabet transition list is generated for each state. An “alphabet transition list” is a list of the transitions out of a particular state for each of the characters in an alphabet. Finally, the transitions are grouped into classes. That is, the transitions that go to the same state are grouped into the same class. Each class is used to identify the next state. The result is a state machine that has less states than the original DFA.
摘要:
A glazing coated with at least one layer having thermochromic properties comprising vanadium oxide, and also with at least one other layer having thermal properties, such as an infrared reflecting layer, and/or at least one other layer having optical properties, such as antireflection in the visible, and/or electrical conduction properties; and having a particular application for making solar control glazing.
摘要:
An oleopneumatic vehicle suspension element in particular for a heavy vehicle, comprising a piston (29) movable in a cylinder (28), a gas accumulator (26), a shock absorber (36) immersed in oil (37) filling the volume between the piston (29) and a diaphragm (27). According to the invention, the suspension element comprises a caloduct (50) connecting the shock absorber (36) to a cold source formed by a free surface (42) of the housing (33) of the suspension element (25), the caloduct (50) containing a fluid which evaporates in contact with the shock absorber (36) heated by the oil, then travels to the cold source (42) where it is condensed and returns thereafter to the shock absorber (36) where it again evaporates. This cooling device enables the temperature of the oil to be limited to the maximum acceptable value and maintains the ground clearance of the vehicle constant.
摘要:
In an electrical connection for high-voltage or medium-voltage switchgear, a bar (2) is inserted in a recess (6) provided with a projection (10). In the invention, the dimensions are established so that the axes (AA, BB) of the bar (2) and of the projection (10) can be inclined relative to each other. Spring-forming conductor elements (12, 14) establish the electrical connection even in the event of tilt. A high-performance electrical contact can thus be obtained compactly, which makes it possible to perform assembly/disassembly operations on electrical equipment without any additional element of the telescopic ferrule or separable bar type.
摘要:
A glazing coated with at least one layer having thermochromic properties comprising vanadium oxide, and also with at least one other layer having thermal properties, such as an infrared reflecting layer, and/or at least one other layer having optical properties, such as antireflection in the visible, and/or electrical conduction properties; and having a particular application for making solar control glazing.