Zhejiang University

Advanced New Technologies Co., Ltd.

Alibaba Group Holding Limited

He Zhang

Zhicheng Zhang

Liwei Quan

Chunxiao Guo

Jiwei Zhang

Huagang Wang

Li Wang

Shurong Dong

Chaofeng Lv

Yinnan Zhang

Yuhui Zhou

Jikui Luo

Disclosed is a method for monitoring vehicle overload based on gravity anomaly, which includes the following steps of: setting a plurality of measuring positions on a single lane, arranging a gravimeter to acquire gravity anomaly values caused by a vehicle when the middle position along the length direction of the vehicle reaching each measuring position, using a monitoring camera to judge the category of the vehicle, acquire three geometric dimensions of the vehicle, and determine the position of the vehicle. The vehicle is simplified as a cuboid, and the mass density distribution is simplified as a piecewise constant function along the length direction of the vehicle. Calculating values of the piecewise constant function according to the gravity anomaly values, calculating a total weight of the vehicle according to the mass density distribution, comparing the total weight with the weight limit of the vehicle to judge whether the vehicle is overloaded.

Method for monitoring vehicle overload based on gravity anomaly

Provided is a contactless displacement sensor based on a flexible photoelectric nanofilm. The displacement sensor is fixed on a mid-span surface of a bridge; a laser light source is arranged under the displacement sensor, and after the has a deflection, the displacement sensor is displaced along with the bridge, resulting in a corresponding change in an output current; the change of a laser transmission distance, namely the deflection of the bridge, can be obtained through back calculation according to an output current signal. Compared with other traditional deflection measuring devices, the contactless displacement sensor based on a flexible photoelectric nanofilm has the advantages of a simple structure, a high measuring precision, a high response speed, a wide in application range, being capable of achieving real-time automatic measurement and the like.

Contactless displacement sensor employing flexible photoelectric nanofilm

A method for allocating virtual articles comprises: receiving at least two acquisition requests directed at a virtual article packet, and respectively recording receiving times of the acquisition requests, wherein the virtual article packet comprises one or more virtual article sub-packets; allocating acquisition sequence numbers respectively to the acquisition requests according to a sequential order of the receiving times of the acquisition requests; and allocating the virtual article sub-packets according to the acquisition sequence numbers for the acquisition requests corresponding to the acquisition sequence numbers, and sending virtual articles in the virtual article sub-packets to users corresponding to the acquisition requests.

Method and system for allocating virtual articles

Provided is a rhomboid structured triboelectric nanogenerator based on a built-in U-shaped support. The device includes a diamond-shaped bracket and two U-shaped supports. The U-shaped supports is connected with the diamond-shaped bracket through four connecting rods, and the supporting plates of U-shaped supports are sequentially adhered with metal conductor layer and a dielectric material layer, which forms the power generation unit. When the diamond-shaped bracket is closed, the dielectric material layers on the two supporting plates come into contact to produce friction charge; and then subjected to the reverse force after compression of the spring, the two dielectric material layers are separated, so as to generate an induction electric field by the friction charge and form a potential difference. Compared with an existing vibration energy harvester, the advantages will be small space occupation, a long service life, simple fabrication, and a high energy conversion rate.

Rhomboid structured triboelectric nanogenerator based on built-in U-shaped support

The present disclosure provides an electrostatic self-powered displacement grid sensor used for measuring the displacement of a component to be measured. The device structure includes a sliding chute and a sliding sheet, wherein the sliding chute is fixed to a fixed end, and the bottom of the inner side of the sliding chute is provided with a sensing array; the sliding sheet is fixedly connected with the component to be measured, and the lower end of the sliding plate is in contact with the bottom of the inner side of the sliding chute. When the sliding sheet slides over the sensing array; a corresponding electrical signal is produced, and the number of segments and the distance on sensing units on a single sensing array over which the sliding sheet slides can be obtained according to numbers and output current of sensing units in the sensing array indicated by the signal, and therefore the structural displacement is obtained. Compared with other displacement measurement devices, a segmented displacement meter has the advantages of simple structure, wide application range, high measurement precision and no additional power supply; moreover, the present disclosure creatively solves the problem of unstable results of calibrating displacement according to electrical signals.

Electrostatic self-powered displacement grid sensor

The present disclosure provides an electrostatic self-powered strain grid sensor configured to measure strain of a component to be measured. The sensor includes a slide groove and a slide sheet. The slide groove is fixed to a fixing end and a sensor array is arranged at an inside bottom of the slide groove. The slide sheet is fixedly connected with the component to be measured and a lower end part of the slide sheet is in contact with the inside bottom of the slide groove. An electric signal is output when the slide sheet sweeps over the sensor array. Based on the output current of a sensor unit of the sensor array indicated by the signal, the number of segments swept over by the slide sheet and a distance swept over the sensor units in a single sensor array by the slide sheet is obtained, thereby acquiring a structural strain.

Electrostatic self-powered strain grid sensor

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for distributing a value among a plurality of accounts. One of the methods includes receiving, from a first terminal associated with a first account, a request for generating values, wherein the request comprises a sum of the values to be generated and a count of multiple second accounts, to which the values are to be distributed. The method also includes determining an average based on the sum and the count, generating multiple values in response to the request, the generated values comprising one or more value pairs and zero or one individual value, wherein a count of the generated values equals the count of second accounts in the request. The method further includes distributing the multiple values to the second accounts, wherein each of the second accounts is associated with a second terminal.

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Hangzhou, China

He Zhang