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2392 results about "Free state" patented technology

The Free State is situated on a succession of flat grassy plains sprinkled with pastureland, resting on a general elevation of 3,800 feet only broken by the occasional hill or kopje.The rich soil and pleasant climate allow for a thriving agricultural industry.

System and method of assigning and reclaiming static addresses through the dynamic host configuration protocol

Presented is a system and method for providing centralized address management of static IP addresses through the dynamic host control protocol. Static or permanent IP addresses are those addresses assigned by DHCP having an infinite lease time. The assignment of such static IP addresses follows the conventional DHCP mechanism for the assignment of other IP addresses. However, the centralized reclamation of a statically or permanently assigned IP address by a network administrator through the DHCP server presents novel aspects of the invention heretofore unknown. Specifically, through the system and method of the present invention, the DHCP server is capable of reclaiming at any point in time, a statically or permanently assigned IP address by transmitting a DHCP RECLAIM command to the DHCP client, or through its relay agent. In the normal situation, the DHCP client acknowledges the RECLAIM command, allowing the IP address to be placed in the FREE state. If, however, the DHCP client does not respond or the responses are not received by the DHCP server, the DHCP server marks the state of the IP address as DEPRECATED. The state of the IP address will be changed from DEPRECATED to FREE once a number of retries of the RECLAIM process has been completed, or a maximum period of time has passed. Security mechanisms to prevent a malicious attacker from reclaiming static IP address from DHCP clients are also presented.
Owner:MICROSOFT TECH LICENSING LLC

Current-magnitude-based open-circuit failure online-diagnosis method for power tube of inverter

The invention discloses a current-magnitude-based open-circuit failure online-diagnosis method for a power tube of an inverter, belongs to the field of motor control, and aims to solve the problem of poor robustness of a current-magnitude-based open-circuit failure diagnosis technology for the power tube of the inverter. The method comprises the following steps of establishing a current observer model of a permanent magnet synchronous motor driving system in a failure-free state, comparing an observed current value with detection current to obtain a three-phase current residual, converting the three-phase current residual to a two-phase coordinate system in a coordinate conversion way to obtain a current residual vector, standardizing the current residual vector, and diagnosing and positioning an open-circuit failure of the power tube of the inverter according to the amplitude and the phase of the standardized current residual vector. The current-magnitude-based open-circuit failure online-diagnosis method for the power tube of the inverter is free of influence of a system closed-loop control algorithm and insensitive to loads, and has higher robustness to parameter errors, measurement errors, system disturbance and the like.
Owner:HARBIN INST OF TECH

Compound amino acid organic fertilizer and production method of compound amino acid organic fertilizer

The invention disclose a compound amino acid organic fertilizer, which is characterized in that the compound amino acid organic fertilizer consists of the following ingredients in parts by weight: 5 to 10 of compound amino acid, 0.3 to 0.5 of microbial yeasts, 16 to 29 of inorganic fertilizers, 5 to 10 of humic acid fertilizers and 0.2 to 1 of trace elements. A production method of the compound amino acid organic fertilizer comprises the following steps that: firstly, compound amino acid water solution, the microbial yeasts and the humic acid fertilizers are respectively prepared, then, inorganic compounds containing boron, copper, iron, manganese and zinc are added into the compound amino acid water solution, and the chelation is carried out at a temperature being 80 to 110 DEG C so that the mixture becomes free-state chelated amino acid salt; after the metering, 10 to 50kg of raw materials are added into each ton of farmyard manure to be mixed, then, the mixed materials are placed into a warehouse for natural stacking and curing for 3 to 5 days and can be pelletized and packed to leave factories. The compound amino acid organic fertilizer can be used as a base fertilizer and an additional fertilizer and belongs to a compound organic fertilizer capable of improving the amino acid content of high-quality fragrant rice and fruit and vegetables, improving the fruit and vegetable quality and improving the sugar content of sugarcanes.
Owner:GUANGXI YUXIN BIOLOGICAL TECH
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