Abstract: The present invention discloses liquid crystal compounds having dibenzopyran derivatives with cycloalkyl groups, and preparation methods and application thereof. The liquid crystal compounds having dibenzopyran derivatives with cycloalkyl terminal groups, shown in formula I, exhibit better miscibility and a very large negative dielectric constant, compared to those having a flexible alkyl chain as a terminal group, therefore the compounds of the present invention, shown in formula I, may improve the miscibility of liquid crystal compounds and broaden the application range of liquid crystal mixtures. In addition, the compounds may also increase the negative dielectric constants of liquid crystal mixtures, having an important application value.

Abstract: A DDoS attack mitigation process, comprising: receiving a request from a client device; computing a data access frequency for the client device, data access frequency being a number of requests received from the client device within a set period of time; comparing the data access frequency to a threshold value, wherein a DDoS attack is suspected if the data access frequency is higher than the threshold value; if a DDoS attack is not suspected, then the request being forwarded to the intended resource; else if a DDoS attack is suspected, then responding to the client user's device with a DDoS attack mitigation challenge webpage embedded with a user-interactive widget to the client user's device requiring the client device's user to drag a prompt icon along a movement path without interrupt for authentication.

Abstract: This invention relates to liquid crystal compound of formula I containing a difluoromethyleneoxy linking group that hydrogen substituted by deuterium and therefore being very suitable for formulating a liquid crystal mixture. A liquid crystal mixture containing such type of liquid crystal compounds can be applied in various display devices.

Abstract: A method for processing information and an electronic device are provided. The method includes: sending a first instruction to a second electronic device through a radio frequency identification unit to inquire identification information of the second electronic device; acquiring the identification information of the second electronic device; and obtaining position information of the second electronic device according to the identification information of the second electronic device. With the disclosure, a more enriched usage scene for man-machine interaction is provided, and user experience is improved.

Abstract: This invention relates to liquid crystal compound of formula I containing a difluoromethyleneoxy linking group that hydrogen substituted by deuterium and therefore being very suitable for formulating a liquid crystal mixture. A liquid crystal mixture containing such type of liquid crystal compounds can be applied in various display devices.

Abstract: This invention relates to liquid crystal compound of formula I containing benzene derivatives group that hydrogen substituted by deuterium. Liquid crystal compounds of formula I have not only large positive dielectric anisotropy, but also moderate optical anisotropy and driving voltage, thereby having great significance to formulate a liquid crystal mixture. A liquid crystal mixture containing such type of liquid crystal compounds can be applied in various display devices, which is particularly suitable for TN and STN display devices, and can also be used in IPS and VA display devices.

Abstract: Methods of stimulating a well comprising providing a stimulation fluid comprising at least one surfactant and submicron particles, the submicron particles having a particle size between about 200 nm and about 800 nm and a specific surface area greater than about 5 square meters per gram; and introducing the stimulation fluid into a wellbore. Additional methods to enhance oil recovery from subterranean reservoirs accessible via a well are described.

Abstract: A connector module is coupled to a ground terminal to discharge accumulated charges. The connector module includes a connector and a metallic housing. The connector has a connecting port. The metallic housing is covered over the connector. The metallic housing has a contact surface as the ground terminal and a flexible portion protruding from the contact surface contacts the ground terminal to discharge the accumulated charges to decrease the electromagnetic interference (EMI) problems, and malfunctions of electronic system caused by electrostatic discharge (ESD) are also decreased. The stability and the reliability of the connector module are thus ensured.

Abstract: By patterning a catalyst layer in a micrometer scale and growing nanotubes on it, the emission area is formed by many small emitter islands. Each emitter island comprises finite randomly aligned nanotubes in a nominal density. Due to the vast number of gaps between emitter islands, relatively more nanotubes are exposed to the edge region of the emitter, which effectively increases the average inter-spacing of nanotubes. The field shielding effect is significantly reduced this way.

Abstract: By patterning a catalyst layer in a micrometer scale and growing nanotubes on it, the emission area is formed by many small emitter islands. Each emitter island comprises finite nanotubes in a nominal density. Due to the vast amount of gaps between emitter islands, relatively more nanotubes are exposed to the edge region of the emitter, which effectively increases the average inter-spacing of nanotubes. The field shielding effect is significantly reduced this way.

Abstract: An automatic spindle with a propeller guide and a hook provided in front of an extension of the propeller guide, the hook being attached to a filament for preparatory spinning, the back-pull given by virtue of such an arrangement serving to bring the propeller guide upwards so that a positioning rotation may be produced upon the frontal tip of the propeller guide as a plurality of engaging teeth provided over the perimeter of the sleeve that is acting upon and as fitted to the perimeter of the propeller guide are engaged respectively in the helical threads over the propeller guide. Thus the string or rope fastened to the frontal tip of the propeller guide can be twisted. A feeder is clamped to the tail end of a hand cone to accommodate the mounting of wires meant for spinning processing, and the front end of the hand cone is fitted with a clipper, thereby serving to feed the wire straight by means of the feeder in the exercise of fastening of objects, and to cut the wires.