摘要:
The invention comprises a single-use, self-contained measuring device, comprising a data entry- and sampling part including a sensor for measuring of physical or chemical property of a foreign substance and a data acquisition part including electronic processing- and storage means, where the parts are integral parts of a packaging, formed of a sheet-like, printable and foldable material, the packaging being designed to enclose and protect the parts contained therein. The packaging may also include various instruments needed to perform a test.
摘要:
A packaging and a method for monitoring a packaging (10) of a disposable material in a chain of logistics. As an integral part of the packaging, the packaging has an electronic module (12) comprising electric energy supply means, data processing means, data storage nonvolatile memory means for storing information related to the packaging, time keeping means, and data transceiver means for transmitting and receiving said information in communication with a host computer (30). The electronic module also has sensor means (14, 20) for detecting a changed physical condition of the packaging and for signaling information representing said changed physical condition to the electronic module (12) to be stored in the memory means together with a notation of time from the time keeping means.
摘要:
A packaging and a method for monitoring a packaging (10) of a disposable material in a chain of logistics. As an integral part of the packaging, the packaging has an electronic module (12) comprising electric energy supply means, data processing means, data storage nonvolatile memory means for storing information related to the packaging, time keeping means, and data transceiver means for transmitting and receiving said information in communication with a host computer (30). The electronic module also has sensor means (14, 20) for detecting a changed physical condition of the packaging and for signaling information representing said changed physical condition to the electronic module (12) to be stored in the memory means together with a notation of time from the time keeping means.
摘要:
An antenna device for transmitting and receiving electromagnetic waves, wherein the antenna device includes a transmitter section and a receiver section. The receiver section includes a receiving antenna structure selectively switchable between a plurality of configuration states. The antenna structure may be switched by a switching device, which is controlled by a control device. The selective switching is effected based upon a first measure representing a reflection coefficient measured at the transmitter section. A method for transmitting and receiving electromagnetic waves includes receiving a measure representing a reflection coefficient and controlling a switching device to selectively switch an antenna structure between a plurality of antenna configuration states in response to the measure representing the reflection coefficient.
摘要:
For filtering off of low frequency and a periodic transient phenomena in relay protection devices for electric high voltage networks, the signals of which occur in the event of a fault in the network and which are superimposed on the signals supplied to measuring relays arranged in the relay protection device, a normally short-circuited filter is included in a normally open alternative path for the measuring signal which is parallel to a part of the normal signal path. A supervisory circuit includes a time circuit, a fast fault indicator and an undervoltage detector. A signal from the fault indicator breaks the short-circuit of the filter and, upon a signal from the undervoltage detector, connects the filter in the path of the measuring signal. The measuring relay is blocked during a time interval which is equal to the difference between the pulse time of the time circuit and the time of operation of the undervoltage detector. This is accomplished by an AND-gate which has its inputs connected to the fast fault indicator and to the undervoltage detector and its output connected to a make-and-break contact for closing the alternative current path.
摘要:
A method and a device for identifying, when a fault has been detected in a power network, single-phase to ground faults by determining for each phase an auxiliary current based on the present phase current, ground fault current and ground current. If the difference between two consecutive, calculated values of the auxiliary current in some phase is smaller than a predetermined limit value, this means that there is a single ground fault in this phase.
摘要:
A rotary displacement compressor having an inlet channel for introducing low pressure gas, an outlet channel through which compressed gas escapes, and at least one rotor mounted in bearings and operating in a working space. The compressor includes a liquid injector for injecting liquid into the working space, a liquid separator provided in the outlet channel for separating liquid from the compressed gas, and a pressure liquid conduit connecting the liquid separator and the liquid injection port. A bearing lubrication circuit includes a tank, a pump, a supply conduit for supplying liquid from the pump to the bearings in which the rotor is mounted, a withdrawal conduit for withdrawing liquid from the bearings to the tank, and a pump inlet conduit for supplying liquid from the tank to the pump. The bearing lubrication circuit further includes a leakage path connecting the tank to a first cavity in the working space and a drainage connection connecting the tank to a second cavity in the working space, the first cavity having a higher pressure than the second cavity.
摘要:
A method and a device for determining the distance from a measuring station to a fault on a transmission line based on a fault model of a transmission network while taking into consideration the zero-sequence impedance and, where assuming a fault current, while taking into consideration the feeding of fault current to the fault point from both ends of the transmission line (FIG. 3 ).
摘要:
The present invention concerns a tubular rock bolt (1) that can be expanded by a pressurised medium, for insertion into a drilled hole (16) and comprising an extended tubular part (2) with a closed cross-section (12) and provided with a longitudinal stamped part (13) that increases in diameter during the expansion of the rock bolt (1) without the periphery of the tubular part (2) being bent, and an end section (17) at one end (15) of the rock bolt (1) and an end piece (19) arranged at the second end (18) of the rock bolt (1) and provided with a connection part (22) for interaction in a manner that can be released with an expansion means (23). The extended tubular part (2) comprises a reinforcement means (3) that extends internally inside the tubular part (2) between the end section (17) and the end piece (19) and that is attached at the end section (17) and the end piece (19). The invention concerns also the manufacture of a rock bolt.
摘要:
An antenna device for transmitting and receiving radio frequency waves, installable in a communication device includes an antenna structure switchable between antenna configuration states. Each state is distinguished by a set of radiation parameters, such as resonance frequency, input impedance, bandwidth, radiation pattern, gain, polarization, and near-field pattern. A switching device selectively switches the structure between the states. The antenna device includes a first receiver which receives a first measured operation parameter indicative of quality of transmission of radio frequency waves by the antenna structure, and a second receiver which receives a second measured operation parameter indicative of quality of reception of radio frequency waves by the structure. The antenna device includes a controller which controls the switching device, and selective switching of the antenna structure between the states, based on the first and second measured operation parameters, to improved transmission and/or reception quality.