Abstract: A three-dimensional Bragg grating may include a single colloidal crystal that includes a plurality of repeated layers of material having different refractive indexes. A sample cell for producing a volume Bragg grating may include an internal shape that forms at least one capillary cell having a flat surface and rounded edges. A method of producing a three-dimensional Bragg grating may include: suspending insoluble particles in a host fluid to form a suspension; and exposing the suspension to a sustained microgravity environment.

Abstract: A cutting plotter includes a cutting plotter shell, a placement plate disposed outside the cutting plotter shell, an upper transmission assembly and a lower transmission assembly disposed at two ends of the cutting plotter shell, and a belt assembly disposed in the cutting plotter. The lower transmission assembly and the upper transmission assembly correspond to each other to assist paper in entering the cutting plotter. A slide rod is disposed in the cutting plotter shell and located at the top of the upper transmission assembly, and a cutting tool assembly is disposed on the slide rod. The belt assembly includes a driving motor. A belt body is steered through a steering belt wheel of the belt assembly, and the distance between parallel parts of the belt body is decreased through two small-radius tensioning belt wheels, such that the chain installation space is reduced and the cutting plotter is compact.

Abstract: A process for preparing trioxane from methanol includes: step 1: subjecting a mixture of methanol and methylal to a reaction to obtain formaldehyde, and absorbing the formaldehyde with water to obtain a concentrated formaldehyde aqueous solution; step 2: subjecting the concentrated formaldehyde aqueous solution to cyclization to obtain a mixture containing trioxane, and passing the mixture through a trioxane concentration tower to obtain a crude trioxane product; step 3: converting a by-product and unreacted formaldehyde in the crude trioxane product into methanol, conducting dehydration through a membrane dehydration process, and subjecting a retentate to dealcoholization to obtain purified trioxane; and step 4: subjecting the remaining streams to reactive distillation to obtain a mixture of methanol and methylal at a top-and water at a bottom of the reactive distillation tower; returning the mixture of methanol and methylal to step 1; and returning or discharging the water.

Abstract: A method for mining an entity relationship, apparatus, electronic device, and a storage medium are provided. An implementation of the method may include: searching, in a query statement set, for a query statement satisfying a preset condition corresponding to a target entity word; in response to at least one query statement satisfying the preset condition corresponding to the target entity word being found in the query statement set, mining an associated entity word corresponding to the target entity word based on the found at least one query statement satisfying the preset condition corresponding to the target entity word.

Abstract: A method and apparatus for mining a tag, a device, and a storage medium are provided. The method may include: determining an existing tag and a category of the existing tag; determining a candidate tag from a target text associated with the category based on the existing tag; and combining the existing tag and the candidate tag, and determining a new tag based on a combining result.

Abstract: A benchtop device flow setup for determining the effectiveness of magnetic treatment of feed water for reducing mineral scaling includes two similar branches, both equipped with a reverse osmosis membrane and a pump that operate in the transient regime at the same flow rate and transmembrane pressure. The flow setup is further fed with a solution at the same level of supersaturation measured in a stirred reactor, however, only one branch exposes the feed to a magnetic field.

Abstract: A benchtop device flow setup for determining the effectiveness of magnetic treatment of feed water for reducing mineral scaling includes two similar branches, both equipped with a reverse osmosis membrane and a pump that operate in the transient regime at the same flow rate and transmembrane pressure. The flow setup is further fed with a solution at the same level of supersaturation measured in a stirred reactor, however, only one branch exposes the feed to a magnetic field.

Abstract: An electronic card connector includes a tray, at least one latching member, a push rod and an ejection assembly. The tray defines a defined space for accommodating an electronic card and at least one notch. Each latching member comprises at least one fixing portion fixed to a housing and a bulge. Each bulge receives in one of the at least one notch to detachably engage the tray with the housing. The push rod includes a first hook. The ejection assembly includes a connecting rod having a second hook and an expansion bracket rotatably coupled to the connecting rod and resisting the tray. When the second hook is engaged with the first hook, the tray is engaged with the housing. When the first hook is disengaged from the second hook, the tray is driven to disengage from the housing by an elastic restoring force of the expansion bracket.

Abstract: An electronic device includes a housing and an electronic card connector. The peripheral sidewall defines a through hole. The electronic card connector includes a tray, a fixing member, a push rod and a connecting rod. The tray defines a defined space for receiving an electronic card and at least one notch. The fixing member includes at least one elastic arm having a hook. The push rod partially passes through the through hole and protrudes from of the housing. The at least one connecting rod connects the second end to the at least one elastic arm. When the at least one hook engages with the at least one notch, the tray is engaged with the housing, and when the push rod is driven to disengage the at least one hook from the at least one notch, the tray is disengaged from the housing.

Abstract: An electronic card connector includes a tray, at least one latching member, a push rod and an ejection assembly. The tray defines a defined space for accommodating an electronic card and at least one notch. Each latching member comprises at least one fixing portion fixed to a housing and a bulge. Each bulge receives in one of the at least one notch to detachably engage the tray with the housing. The push rod includes a first hook. The ejection assembly includes a connecting rod having a second hook and an expansion bracket rotatably coupled to the connecting rod and resisting the tray. When the second hook is engaged with the first hook, the tray is engaged with the housing. When the first hook is disengaged from the second hook, the tray is driven to disengage from the housing by an elastic restoring force of the expansion bracket.

Abstract: An electronic device includes a first shell defining a first opening; a power module received in the first shell; and an electronic card connector including a tray passing through the first opening to be received in the first shell, and a receiving member attached to the first shell for receiving the tray. The electronic card connector includes a permanent magnet mounted in the tray and an electromagnet attached to the first shell and facing the permanent magnet. The electronic device further includes a current control module electrically coupled with the power module and configured to control the power module to magnetize or de-magnetize the electromagnet. When the electromagnet is de-magnetized, the tray is attracted by the permanent magnet to engage the tray with the first shell. When the electromagnet is magnetized, the tray is driven to disengage the tray with the first shell by the permanent magnet.

Abstract: An electronic device includes a housing and an electronic card connector fixed on the housing. The electronic card connector includes a tray and a fixing member. The tray includes a main body defining a card slot. The tray further includes two elastic arms protruding from two sidewalls of the tray respectively. The elastic arms include protrusions. The fixing member includes two notches corresponding to the two protrusions. When the main body receives in the second accommodating space, each of the two protrusions receives in one of the two notches respectively to engage the tray with the fixing member. When a pressure applied on the two elastic arms to enable the two protrusions to disengage from the two notches, the tray is disengaged from the fixing member.

Abstract: A rotatable display device which is adjustable in height includes a housing, a display, a base, a connection apparatus, a fixing apparatus, a fixing shaft, and a coil spring. The display is received in the housing. The connection apparatus is attached to the housing. The fixing apparatus is attached to the base. The fixing shaft is attached to the fixing apparatus. The coil spring is sleeved on the fixing shaft. A distal end of the coil spring is attached to the fixing apparatus and is moved up and down to take the weight of the display device at any required height.

Abstract: An earphone receiving case includes a housing, a cover attached to the housing, a handle, a rotation apparatus, a rotation tray, a clasping member and an elastic member. A part of the handle is exposed out of the housing. The rotation apparatus is rotationally attached to the housing and attached to the handle. The rotation tray is rotationally attached to the cover and defines a plurality of clasping slots. One end of the clasping member is rotationally attached to the rotation apparatus. The other end of the first clasping member abuts against one clasping slot. The elastic member is attached to the first clasping member. When the handle is pushed, the clasping member can break away from the one clasping slot. The elastic member responds to push the clasping member to be received in another one clasping slot when the clasping member breaks away from the one clasping slot.

Abstract: An electronic card connector includes a tray, a first push rod rotatably attached to a bottom wall, a second push rod and an arc-shaped push rod. The second push rod includes a first end and a second end. The first end resists the first rod body. The second end is used for a user pushing. The arc-shaped push rod includes a fixing portion rotatably attached to the bottom wall and a latching portion. The latching portion engages the tray with the housing. Therein, the second push rod is driven to rotatably push the first push rod, thereby cause the first push rod to resist the latching portion and drive the arc-shaped push rod to rotate so as to disengage the latching portion with the tray.

Abstract: An earphone receiving case includes a top shell, a bottom shell, a coil spring, an earphone, and a button. The bottom shell engages with the top shell to define a receiving space. The coil spring is received in the receiving space. The earphone includes a headphone cable. Two ends of the headphone cable are always accessible outside the earphone receiving case. The button is movably fixed to the bottom shell and presses on a part of the headphone cable. A distal end of the coil spring is fixed to the headphone cable. The coil spring rotates to accumulate rotation energy when the headphone cable is pulled out from the earphone receiving case. When the first button is pressed, the part of the headphone cable being pressed is loosened, and the coil spring rotates to release the stored energy to retract the headphone cable back into the earphone receiving case.

Abstract: An electronic device includes a housing and an electronic card connector. The peripheral sidewall defines a through hole. The electronic card connector includes a tray, a fixing member, a push rod and a connecting rod. The tray defines a defined space for receiving an electronic card and at least one notch. The fixing member includes at least one elastic arm having a hook. The push rod partially passes through the through hole and protrudes from of the housing. The at least one connecting rod connects the second end to the at least one elastic arm. When the at least one hook engages with the at least one notch, the tray is engaged with the housing, and when the push rod is driven to disengage the at least one hook from the at least one notch, the tray is disengaged from the housing.

Abstract: A protection case for protecting an electronic device includes a body shaped to receive and hold to the electronic device, and a cover. A space is formed between the cover and the body, and an opening is defined in the cover. A lanyard passes through the opening and is partly received in the space, and an elastic element is accommodated in the space. The lanyard includes a first end fixed to the protection case, and a second end connected to the lanyard.

Abstract: A flatbase bracket includes a body and a support component arranged in the body. The body includes a first shell and a second shell rotatably coupled to the first shell. The support component includes a first support element and a second support element rotatably coupled to the first support element. The first support element has a free end that is opposite to an end coupled to the second support element, and the free end is configured for resisting the body. The second support element has a free end that is opposite to an end coupled to the first support element, and the free end is configured for clasping on the body. The first support element and the second support element are arranged on the body at an angle to support an object.

Abstract: An electronic device includes a housing and an electronic card connector fixed on the housing. The electronic card connector includes a tray and a fixing member. The tray includes a main body defining a card slot. The tray further includes two elastic arms protruding from two sidewalls of the tray respectively. The elastic arms include protrusions. The fixing member includes two notches corresponding to the two protrusions. When the main body receives in the second accommodating space, each of the two protrusions receives in one of the two notches respectively to engage the tray with the fixing member. When a pressure applied on the two elastic arms to enable the two protrusions to disengage from the two notches, the tray is disengaged from the fixing member.