摘要:
The invention provides 2-nitromethylene hexahydropyrimidines of the general formula: ##STR1## in which R represents a hydrogen atom; a cycloalkyl group optionally substituted by alkyl and/or halogen; or a group of formula --(CO).sub.n (Y).sub.m R.sup.2 in which n is 0 or 1, Y is oxygen or sulphur, m is 0 or 1 and R.sup.2 represents an alkyl, alkenyl or alkynyl group optionally substituted by one or more substituents selected from halogen; alkoxy; haloalkoxy; alkoxyalkoxy; hydroxy; acyloxy; thiol; cycloalkyl optionally substituted by alkyl and/or halogen; and optionally substituted phenyl; and R.sup.1 represents an optionally substituted phenyl group; their preparation and their use as pesticides.
摘要:
The invention provides a confocal microscope or endoscope, having a source of coherent light for illuminating a sample, and an imaging optical fibre bundle (82) for receiving return light, whereby the fibre bundle (82) provides a return channel for fluorescent return light (78). The optical fibre bundle (82) preferably preserves, between entry and exit ends of the bundle, the relative spatial coordinates of the cores of individual fibres constituting the bundle.
摘要:
A fiber optic bundle for use in contact endoscopy or microscopy, comprising a pointed forward tip for insertion into a specimen, the forward tip having at least a portion that is oriented obliquely to the longitudinal axis of the bundle . The forward tip may be, for example, flat and oblique.
摘要:
The invention provides a process for the preparation of nitromethylene heterocyclic compounds of general formula ##STR1## wherein R.sup.1 represents a hydrogen atom or a formyl or acetyl group, each moiety R.sup.2 is independently selected from hydrogen atoms and C.sub.1-4 alkyl and benzyl groups, and n is 2 or 3, which process comprises reacting an alkali metal methylnitrodithioacetate with a compound of formulaH.sub.2 N--(CR.sub.2.sup.2).sub.n --OSO.sub.3 H (II)wherein R.sup.2 and n are as defined above, optionally followed by conversion of the resulting compound of Formula I wherein R.sup.1 is hydrogen to the corresponding compound of Formula I wherein R.sup.1 is formyl or acetyl. Certain compounds of Formula I are known insecticidally active compounds.
摘要:
A telecommunications system communicates internet packet data, carrying a plurality of different types of data, to and/or from a mobile communications user equipment. The system comprises a gateway support node (GGSN), a serving support node (SGSN) and a radio network controller (RNC). The mobile user equipment (UE) is operable to communicate a context application request to the serving support node (SGSN) specifying main quality of service parameters and at least one other data field representing a request for a different set of quality of service parameters, each of the quality of service parameters being provided for one of the different types of data in the data packet. The serving support node (SGSN) is responsive to the context application request to establish a virtual channel between the gateway support node (GGSN) and the user equipment via the serving support node (SGSN), including a radio access bearer in accordance with each of the plurality of quality of service parameters for communicating the different data types. An advantage is thereby provided in that a more efficient use of radio resources can be provided, because the radio access bearer can be matched to the type of data to be communicated.
摘要:
A scanning mechanism for an optical probe having an optical head and an optical transmitter for transmitting light from a light source to the optical head, the scanning mechanism comprising a resilient member coupled to the optical transmitter, a fluid supply for providing a fluid to the head, and an exit path for the fluid from the head that has a fluid entry. The resilient member is located at the fluid entry so that fluid flow into the fluid entry passes over a portion of the resilient member and creates a pressure difference across the resilient member such that the resilient member is urged into the fluid entry thereby reducing the fluid flow and reducing the pressure difference, whereby the resilient member and therefore the fiber can be induced to oscillate.
摘要:
Sulphenyl nitromethane derivatives of formula: ##STR1## in which R.sup.1 represents an alkyl group or a cycloalkyl-alkyl group; and R.sup.2 represents an alkyl group optionally substituted by one or more halogen atoms or an aryl group optionally substituted by one or more halogen atoms or by one or more alkyl or alkoxy groups, exhibit pesticidal, in particular insecticidal activity. They are prepared by reacting the corresponding nitromethylene carboxylate with a sulphenyl halide R.sup.2 --S--Hal in the presence of a base.
摘要:
The invention provides a confocal microscope or endoscope, having a source of coherent light for illuminating a sample, and an imaging optical fibre bundle (82) for receiving return light, whereby the fibre bundle (82) provides a return channel for fluorescent return light (78). The optical fibre bundle (82) preferably preserves, between entry and exit ends of the bundle, the relative spatial coordinates of the cores of individual fibres constituting the bundle.
摘要:
A multiplexed fiber optic sensor system. The system has an array of sensor elements, each responsive to a respective measurand, a light source, a fiber optic waveguide for directing light from the source to the array, a scanner for providing relative motion between the array and the light, a beamsplitter for receiving return light from the array so that the return light can be detected for analysis, and a photodetector for receiving the return light and providing an output signal in response thereto. The scanner is operable to scan the light over the sensor elements so that return light be collected from each respective element, whereby data can be determined concerning each respective measurand.
摘要:
A process for preparing insecticidal N-acyl-tetrahydro-2-nitromethylene-2H-1,3-thiazines, intermediates involved therein and certain of the products.