Zhejiang Dahua Technology Co., Ltd.

Zhejiang Gongshang University

Zhejiang University

Kai Liu

Hongxing Ding

Faguan Lin

Xiaoning Jiang

Hongmin Xie

Yuhan Zhou

Feng Wang

Xingming Zhang

Qiang Ma

Qian Zhang

Jie Zhang

Kelei Jiang

Zhen Liu

Jian Fang

Zhendong Yu

Fengqing Zhang

Yanguo Zhou

Jiahao Yao

Xinhui Zhou

Yuanyuan Xing

Weijie Liu

Jia'nan Qi

Yukuan He

Wenqiang Pan

Changtao Hu

The present disclosure relates to zoom lenses. A zoom lens may include in order from an object side to an image side: a first lens group; a second lens group; a third lens group; a fourth lens group; and a fifth lens group; wherein the zoom lens satisfies certain conditions.

Zoom lens

A method and a system for filtering ill corpus are provided. The method includes following steps: acquiring a text corpus to be recognized, and preprocessing the text corpus to be recognized to obtain a basic text corpus; extracting entities in the basic text corpus, and performing matching search on the entities of the basic text corpus according to an ill-text knowledge graph to obtain a first recognition result; detecting and recognizing the basic text corpus according to a corpus recognition model to obtain a second recognition result; and filtering the text corpus to be recognized according to the first or/and the second recognition result, and updating the ill-text knowledge graph according to the second recognition result. With semantic network essence and strong correlation ability of knowledge graph technology, candidate ill entities can be obtained, thus facilitating filtering of obscure ill information in forms of pinyin, homophonic words and split words.

Method and system for filtering ill corpus

A zoom lens is provided. The zoom lens may include in order from an object side to an image side: a first lens group; a second lens group; a third lens group; a fourth lens group; and a fifth lens group; wherein the zoom lens satisfies the following conditions: −1.7≤f/f≤−0.3, 0.7≤f/f≤2.1, 1.1≤f/f≤2.5, and TTL/f≤6.5, wherein fdenotes a focal length of the second lens group, fdenotes a focal length of the third lens group, fdenotes a focal length of the fourth lens group, fdenotes a focal length of the zoom lens, and TTL denotes a total track length of the zoom lens.

Zoom lens and optical device having the same

The present disclosure relates to zoom lenses and optical devices using the same. A zoom lens may include in order from an object side to an image side: a first lens group, a second lens group, a third lens group, a fourth lens group; and a fifth lens group. The zoom lens may satisfy the following conditions: −2.28≤f/f≤−1.08, and 0.15≤TTL/(BFL*f′)≤0.45, wherein fdenotes a focal length of the second lens group, fdenotes a focal length of the zoom lens at a wide angle end, TTL denotes a total track length of the zoom lens, and BFL denotes a back focal length of the zoom lens.

The present disclosure is related to a lens systems. The lens system includes, in order from an object side to an image side, a first lens group Ghaving negative refractive power, a second lens group Ghaving positive refractive power, a third lens group Ghaving positive refractive power, and the lens system satisfies the following condition: and at least partial of Gis made of material satisfying the following condition: Vd&#x3e;g and dn/dt&#x2264;h, wherein a, b, c, d, e, f, g and h are constants, frepresents a focal length of Gfrepresents a focal length of Gfrepresents a focal length of Gf' represents a focal length of the lens system, Vd represents an abbe constant, n represents a refractive index, t represents temperature, and dn/dt represents a differential of refractive indices against temperature.

Lens system and imaging device

The disclosure provides a method, a device and a system for fault detection. The fault detection method includes following steps: acquiring interactive data generated during a working process of a target Internet of Things system, and generating data to be detected based on the interactive data; detecting whether the data to be detected is fault data or not, and performing an emotion analysis on the data to be detected which is judged as the fault data to obtain a corresponding emotion label; and extracting a corresponding fault type from a preset fault emotion mapping table based on the emotion label and outputting the fault type. In this disclosure, the interactive data is analogized to human emotions, and the faults are accurately found through the emotional analysis on the data, thereby achieving the fault detection of the Internet of Things system in a convenient, flexible and accurate manner.

Method, device and system for fault detection

The present disclosure relates to a lens system and an imaging device including the lens system. The lens system may include a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group in sequence from an object side to an image side along an optical axis of the lens system. At least one of the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group may be adjustable along the optical axis of the lens system to adjust a focal length of the lens system. The lens system may satisfy 

The disclosure discloses a high-performance liquefaction mitigation method forstone columns for protecting the existing buildings during earthquakes. Specifically, a small equipment is used to dig trenches in the soil around the existing building. Then, a spiral driller is used to drill a series of boreholes in the trenches according to the optimized borehole design. Next, two or three layers of optimized gravel material with high permeability are filled into the boreholes to work as the inverted layer. Finally, geotextile is arranged around the trench and the trench is filled with the optimized gravel. Compared with current liquefaction mitigation methods for existing buildings, the disclosure is suitable for liquefaction mitigation in large cities, and has the advantages of low disturbance to the overlaid building, simple construction process, high construction efficiency, low construction cost, long service life and the construction material could be easily obtained.

High-performance liquefaction-resistance treatment method for gravel pile of existing building foundation

A zoom lens system for providing high quality images with higher resolution includes a first lens group (), an aperture stop (), and a second lens group (). The first lens group has a positive or negative refractive power, and includes at least two lens elements having a negative refractive power and at least on lens element having a positive refractive power. The second lens group has a positive refractive power. A distance between a first and second lens group is not fixed.

Growing community of inventors

Hangzhou, China

Kai Liu