Abstract: An optical defocus lens includes: a first lens layer and at least one liquid crystal lens layer, where the first lens layer is a concave lens, a convex lens, or a plano lens, a refractive index of liquid crystal molecules in each of the at least one liquid crystal lens layer is controlled by an electric field, to converge or diverge polarized light that is incident to a direction of each liquid crystal lens layer to form a focal point; a first liquid crystal lens layer is configured to converge or diverge polarized light in a first direction to form a first focal point; and the first lens layer or a second liquid crystal lens layer is configured to converge or diverge polarized light in a second direction to form a second focal point.

Abstract: An image sensor includes an array of metasurface structures and an array of optical-to-electrical conversion units. The array of metasurface structures is located above the array of optical-to-electrical conversion units. A first optical-to-electrical conversion unit in the array of optical-to-electrical conversion units includes a plurality of optical-to-electrical conversion elements, each optical-to-electrical conversion element in the first optical-to-electrical conversion unit corresponds to one frequency band in a spectrum. A first metasurface structure in the array of metasurface structures includes a first substrate and a microstructure located above the first substrate. The first substrate and the microstructure are configured to transmit an optical signal at each frequency band to an optical-to-electrical conversion element corresponding to each frequency band.

Abstract: This application provides a floating optical device, an optical module, and an optical system that are configured to perform floating display. The floating optical device includes a focusing layer, a transmission layer, and a convergence layer that are sequentially stacked in a direction of an optical axis. The focusing layer includes a plurality of focusing units that are periodically arrayed. The convergence layer includes a plurality of convergence units that are periodically arrayed. The plurality of focusing units and the plurality of convergence units are in a one-to-one correspondence in the direction of the optical axis. In the focusing unit and the convergence unit that correspond to each other, the focusing unit is configured to modulate incident light rays, to concentrate incident light rays that are parallel to each other to a same incident concentration point on the incident surface of the transmission layer.

Abstract: A method for performing homologous recombination between at least a first nucleic acid molecule and a second nucleic acid molecule which share at least one region of sequence homology. A method for improving the efficiency of homologous recombination.

Abstract: A backlight display assembly and an apparatus on which the backlight display assembly is deployed are disclosed, to effectively improve light utilization of the backlight display assembly. The backlight display assembly includes a light filter layer, a spectrum splitting layer, and a backlight layer. The light filter layer includes a plurality of light filter units, and each light filter unit includes a plurality of different light filters. The spectrum splitting layer is disposed on one side of the light filter layer, and the spectrum splitting layer and the light filter layer are spaced from each other. The spectrum splitting layer includes a micro-nano structure including a plurality of strip structures, and an arrangement direction of the plurality of strip structures is consistent with an arrangement direction of the plurality of different light filters.

Abstract: A lens, glasses, and a lens adjustment method are provided. The lens includes a first lens layer. The first lens layer includes a plurality of liquid crystal regions. At least one liquid crystal region forms a first optical region. At least one liquid crystal region forms a second optical region. Optical powers of the liquid crystal regions may be changed by controlling rotation of liquid crystal molecules in the liquid crystal regions separately included in the first optical region and the second optical region, so that an optical power of the first optical region can be different from an optical power of the second optical region.

Abstract: An optical defocus lens includes: a first lens layer and at least one liquid crystal lens layer, where the first lens layer is a concave lens, a convex lens, or a plano lens, a refractive index of liquid crystal molecules in each of the at least one liquid crystal lens layer is controlled by an electric field, to converge or diverge polarized light that is incident to a direction of each liquid crystal lens layer to form a focal point; a first liquid crystal lens layer is configured to converge or diverge polarized light in a first direction to form a first focal point; and the first lens layer or a second liquid crystal lens layer is configured to converge or diverge polarized light in a second direction to form a second focal point.

Abstract: A reflective display device includes an antenna array that includes a dielectric material array with an electrochromic material thin film is disposed on one side of a substrate; a control circuit is connected to the electrochromic material thin film using a conductive material so as to control an electrochromic material using an electrical signal; and a change of an imaginary part of a refractive index of the electrochromic material thin film is controlled using the electrical signal to change a specific color of a display luminance.

Abstract: This disclosure discloses communication methods and apparatuses. One example method includes: obtaining slice information of a session, sending a first message to a network function repository function network element, and receiving identification information of an intermediate session management function network element from the network function repository function network element. The intermediate session management function network element is configured to manage an intermediate user plane function network element, and the intermediate user plane function network element is configured to forward service data between an access network device to which a terminal is connected and an anchor user plane function network element in response to the terminal moving out of a service area of the anchor user plane function network element and a service area of an anchor session management function network element.

Abstract: This application discloses example optical filter arrays, including a first-type optical filter array and a second-type optical filter array, where the first-type optical filter array comprises spectral information of a first band range, the second-type optical filter array comprises spectral information of a second band range, and the spectral information of the second band range is different from the spectral information of the first band range. Alternatively, the spectral information of the second band range and the spectral information of the first band range overlap within a preset band range. Embodiments of this application further provide example mobile terminals, example intelligent vehicles, example monitoring devices, and example electronic devices.

Abstract: An image sensor includes an array of metasurface structures and an array of optical-to-electrical conversion units. The array of metasurface structures is located above the array of optical-to-electrical conversion units. A first optical-to-electrical conversion unit in the array of optical-to-electrical conversion units includes a plurality of optical-to-electrical conversion elements, each optical-to-electrical conversion element in the first optical-to-electrical conversion unit corresponds to one frequency band in a spectrum. A first metasurface structure in the array of metasurface structures includes a first substrate and a microstructure located above the first substrate. The first substrate and the microstructure are configured to transmit an optical signal at each frequency band to an optical-to-electrical conversion element corresponding to each frequency band.

Abstract: One example image sensor includes a metasurface, a substrate, and an optical-to-electrical converter. Arrays in the metasurface are arranged on the top of the substrate. The metasurface includes multiple subunits. Each subunit includes an array including multiple columnar structures. The bottom of the substrate is disposed on a surface of the optical-to-electrical converter in the image sensor. The metasurface includes at least two media with different refractive indexes. The optical-to-electrical converter includes an array for optical-to-electrical conversion. The array of the optical-to-electrical converter is divided into multiple color regions. The metasurface is configured to refract incident light and transmit, through the substrate, refracted light to a corresponding color region in the array of the optical-to-electrical converter. In addition, each subunit refracts incident light and then transmits refracted light to a color region in a corresponding color unit.

Abstract: Provided is a strain of bactericidal nitrogen-fixing Pseudomonas protegens CHA0-?retS-NiF, a fermentation method and an application thereof. The strain is deposited under the accession number CGMCC No. 14476. The optimum culture condition thereof is at pH 7, the temperature of 28° C., and rotation speed of 600 rpm. Further provided is a microbial agent containing the Pseudomonas protegens CHA0-?retS-NiF as an active ingredient. The Pseudomonas protegens CHA0-?retS-NiF has strong nitrogen-fixing and bactericidal capabilities and may be used to prevent and cure plant diseases and to boost plant growth.

Abstract: A method for performing homologous recombination between at least a first nucleic acid molecule and a second nucleic acid molecule which share at least one region of sequence homology. A method for improving the efficiency of homologous recombination.

Abstract: Provided are Pseudomonas protegens mutant strain Pf5-NiF, Pf5-?retS, or Pf5-?retS-NiF, and a screening method therefor and an application thereof. By means of Red/ET recombination and direct cloning technologies, the NiF nitrogen fixation gene island in the genome of Pseudomonas stutzeri DSM4166, taken as a whole, is cloned into the genome of Pseudomonas protegens Pf5, so as to heterologously express the same successfully to obtain a genetically engineered strain Pf5-NiF, thereby bringing a biological nitrogen fixation function to Pseudomonas protegens Pf5 which does not own a biological nitrogen fixation function. In addition, gene-directed markerless knockout of retS gene in the genome of Pseudomonas protegens Pf5 is performed to obtain a genetically engineered strain Pf5-?retS. Thus, the expression levels of an antibiotic 2,4-diacetylphloroglucinol and red pigment are increased, and a mutant strain of Pseudomonas protegens Pf5 having a stronger bactericidal activity is obtained.

Abstract: A method of homologous recombination, including in vitro joining two or more target nucleic acid molecules with a first exonuclease, and recombining the two or more target nucleic acid molecules in the presence of a second exonuclease and an annealing protein. The recombined target nucleic acid molecules share at least one homologous sequence.

Abstract: A method for performing homologous recombination between at least a first nucleic acid molecule and a second nucleic acid molecule which share at least one region of sequence homology. A method for improving the efficiency of homologous recombination.

Abstract: This invention is related to bacterial engineering and the heterologous expression of useful compounds. In particular, the invention relates to a heterologous host that has been engineered for expression of a gene which is capable of polyketide or non-ribosomal peptide synthesis. Methods of treating cancer are also disclosed.

Abstract: Disclosed are techniques for creating individual user profile, including: detecting behaviors of a user and assigning the user with various labels; determining a reference value of each attribute derived from each label based on the number and/or timeliness of a label assigned to the user within a period, an attribute derived from each label using the rules of derivation and the logical strength values of the rules of derivation; comparing the reference value of one of the attributes derived from each label with a predetermined threshold to judge whether or not it can be determined that the user attributes include the one of the attributes, determining, if not, it is judged whether it can be determined that the user attributes include the one of the attributes using the reference value as well as reference values of the attribute under other labels; and completing a user profile.

Abstract: Techniques are disclosed for creating a group user profile to improve group user profiling accuracy, including: detecting behaviors of each user in a target user group based on a label-attribute-weight library including labels, attributes under the labels, and reference attribute weights, and assigning each user with corresponding labels; determining, by referring to the label-attribute-weight library, attribute weights of attributes under labels for each user in the target user group, weight-averaging the attribute weights based on types of the attributes, and determining the attribute weights of various attributes of the target user group; and creating a group user profile of the target user group based on the determined attribute weights of various attributes of the target user group. The disclosure also provides a system for creating a group user profile.