Abstract: The present invention discloses a RamA transcription factor mutant for promoting the production of N-acetylglucosamine and use thereof. The mutant is obtained by mutating lysine at position 90 to asparagine and serine at position 92 to lysine in a parent having an amino acid sequence as shown in SEQ ID NO: 2. The present invention provides a genetically engineered strain that overexpresses the RamA transcription factor mutant and increases the production of N-acetylglucosamine. By overexpressing the transcription factor RamA that is involved in the regulation of carbon metabolism, the extracellular accumulation of N-acetylglucosamine is increased, with a maximum concentration reaching 31.5 g/L, which lays a foundation for further metabolic engineering of Corynebacterium glutamicum to produce glucosamine. The method for constructing recombinant Corynebacterium glutamicum of the invention is simple, and convenient in use, and thus has good application prospects.

Abstract: A space launch system and method through electromagnetic pushing. The space launch system comprises an energy storage subsystem, an energy conversion subsystem, a linear motor subsystem, and a control maintenance subsystem. The space launch system converts the electric energy into an electromagnetic force. Through the electromagnetic force, a rocket is pushed to be accelerated to a certain speed along an electromagnetic launching track to realize the launching of the rocket.

Abstract: Disclosed is in the present disclosure a dynamic compensation wind measurement lidar system, including a laser, an A/D converter, a signal processor, and a data processor. The signal processor includes a power spectrum calculation module, a motion sensor, and a pulse integration module. The pulse integration module divides an optical pulse transmitted in a single beam period into n sections for integration, where real-time motion and attitude data collected by the motion sensor is added to each of the sections for integration to improve a signal-to-noise ratio by integrating a power spectral density for a plurality of periodic pulse signals. In the present disclosure, by means of integrating optical pulses in single-beam dwell time by sections and attitude superimposing, an attitude compensation frequency may be greatly increased, and the attitude compensation frequency is adjustable.

Abstract: Disclosed is in the present disclosure a dynamic compensation wind measurement lidar system, including a laser, an A/D converter, a signal processor, and a data processor. The signal processor includes a power spectrum calculation module, a motion sensor, and a pulse integration module. The pulse integration module divides an optical pulse transmitted in a single beam period into n sections for integration, where real-time motion and attitude data collected by the motion sensor is added to each of the sections for integration to improve a signal-to-noise ratio by integrating a power spectral density for a plurality of periodic pulse signals. In the present disclosure, by means of integrating optical pulses in single-beam dwell time by sections and attitude superimposing, an attitude compensation frequency may be greatly increased, and the attitude compensation frequency is adjustable.

Abstract: The present invention provides a recombinant Corynebacterium glutamicum producing N-acetylglucosamine and use thereof. The recombinant Corynebacterium glutamicum is obtained by overexpressing, in Corynebacterium glutamicum, the transcription factor SugR derived therefrom. The recombinant Corynebacterium glutamicum of the present invention increases the production of acetylglucosamine to up to 26 g/L, and lays a foundation for further metabolic engineering of Corynebacterium glutamicum to produce glucosamine.

Abstract: A space launch system and method through electromagnetic pushing. The space launch system comprises an energy storage subsystem, an energy conversion subsystem, a linear motor subsystem, and a control maintenance subsystem. The space launch system converts the electric energy into an electromagnetic force. Through the electromagnetic force, a rocket is pushed to be accelerated to a certain speed along an electromagnetic launching track to realize the launching of the rocket.

Abstract: The present invention discloses a RamA transcription factor mutant for promoting the production of N-acetylglucosamine and use thereof. The mutant is obtained by mutating lysine at position 90 to asparagine and serine at position 92 to lysine in a parent having an amino acid sequence as shown in SEQ ID NO: 2. The present invention provides a genetically engineered strain that overexpresses the RamA transcription factor mutant and increases the production of N-acetylglucosamine. By overexpressing the transcription factor RamA that is involved in the regulation of carbon metabolism, the extracellular accumulation of N-acetylglucosamine is increased, with a maximum concentration reaching 31.5 g/L, which lays a foundation for further metabolic engineering of Corynebacterium glutamicum to produce glucosamine. The method for constructing recombinant Corynebacterium glutamicum of the invention is simple, and convenient in use, and thus has good application prospects.

Abstract: The present invention provides a recombinant Corynebacterium glutamicum producing N-acetylglucosamine and use thereof. The recombinant Corynebacterium glutamicum is obtained by overexpressing, in Corynebacterium glutamicum, the transcription factor SugR derived therefrom. The recombinant Corynebacterium glutamicum of the present invention increases the production of acetylglucosamine to up to 26 g/L, and lays a foundation for further metabolic engineering of Corynebacterium glutamicum to produce glucosamine.

Abstract: A frame structure includes a frame body, a corner connector and roller mechanism arranged in a splice of adjacent side frames at a bottom of the frame body, and a guide mechanism clamped to a top of the frame body. A glass positioning slot is disposed on a first side of an inner side wall of a side frame of the frame body. A mounting slot is disposed on a first side of an outer side wall of the side frame of the frame body and used for fixing the guide mechanism or the corner connector and roller mechanism. The glass positioning slot is adjacent to the mounting slot along a lengthwise direction of the first side of the inner side wall. A sliding door is further provided.

Abstract: A frame structure includes a frame body, a corner connector and roller mechanism arranged in a splice of adjacent side frames at a bottom of the frame body, and a guide mechanism clamped to a top of the frame body. A glass positioning slot is disposed on a first side of an inner side wall of a side frame of the frame body. A mounting slot is disposed on a first side of an outer side wall of the side frame of the frame body and used for fixing the guide mechanism or the corner connector and roller mechanism. The glass positioning slot is adjacent to the mounting slot along a lengthwise direction of the first side of the inner side wall. A sliding door is further provided.

Abstract: A non-transitory computer-readable recording medium stores therein an index generating program that causes a computer to execute a process including: inputting control statements including plural phrases and having contents that change according to description positions of the plural phrases; generating first index information related to positional information of each of the phrases in the control statements; and generating, from the first index information, a second index information group related to the phrases targeted by each of reserved words included in the control statements.

Abstract: It relates to a high-power laser attenuator wherein laser is incident into an attenuator housing through a lens barrel; a ½ wave plate, a first lens and a second lens are arranged in sequence on an incident light path along a laser incident direction; the ½ wave plate can rotate around the incident light path, and normal lines of incident planes of the two lenses and the incident light axis are set to form a Brewster angle; a laser absorber assembly is arranged in a reflected light path of the first lens.

Abstract: Provided are a method for establishing a WLAN by a mobile terminal and a mobile terminal. The method comprises: when the mobile terminal needs to establish a WLAN with other terminals, the mobile terminal starts Bluetooth, and modifies a name of a Bluetooth device of the mobile terminal to a character string that contains an identifier; and starts Bluetooth search to acquire Bluetooth MAC addresses of other terminals with the identifiers contained in the name of the Bluetooth device; and a Bluetooth MAC address of the mobile terminal is compared with the acquired Bluetooth MAC addresses respectively, and when the Bluetooth MAC address of the mobile terminal meets a pre-set condition, setting the mobile terminal as a wireless access point of the WLAN.

Abstract: It relates to a high-power laser attenuator wherein laser is incident into an attenuator housing through a lens barrel; a ½ wave plate, a first lens and a second lens are arranged in sequence on an incident light path along a laser incident direction; the ½ wave plate can rotate around the incident light path, and normal lines of incident planes of the two lenses and the incident light axis are set to form a Brewster angle; a laser absorber assembly is arranged in a reflected light path of the first lens.

Abstract: Provided are a method for establishing a WLAN by a mobile terminal and a mobile terminal. The method comprises: when the mobile terminal needs to establish a WLAN with other terminals, the mobile terminal starts Bluetooth, and modifies a name of a Bluetooth device of the mobile terminal to a character string that contains an identifier; and starts Bluetooth search to acquire Bluetooth MAC addresses of other terminals with the identifiers contained in the name of the Bluetooth device; and a Bluetooth MAC address of the mobile terminal is compared with the acquired Bluetooth MAC addresses respectively, and when the Bluetooth MAC address of the mobile terminal meets a pre-set condition, setting the mobile terminal as a wireless access point of the WLAN.

Abstract: Disclosed are a wireless communication hotspot creation and connection method, a hotspot creation end and a hotspot connection end. By encrypting a user name at a hotspot creation end to generate a hotspot name, the method configures a wireless communication parameter for the hotspot name generated by encryption to establish a wireless communication hotspot so as to enable a hotspot connection end to access the established wireless communication hotspot by decrypting the hotspot name, ensures that WiFi hotspot creation and automatic recognition are achieved between two or more terminals, and then achieves accurate WiFi interconnection.