Nec (china) Co., Ltd.

Fujitsu Corporation

University of Science and Technology Beijing

Jianqiang Li

Cheng Zhang

Yu Xin Zhao

Zhenning Tao

Jin Zhang

Chao Zhao

Jinfeng Huang

Yong Lian

Bo Liu

Lei Li

Takahito Tanimura

Chunchen Liu

Huijian Zhang

Xin Meng

Jingwei Shi

The present application provides a low carbon martensitic high temperature strength steel and a preparation method thereof, wherein the chemical composition of the low carbon martensitic high temperature strength steel are: C: 0.10-0.25 wt %, Cr: 10.0-13.0 wt %, Ni: 2.0-3.2 wt %, Mo: 1.50-2.50 wt %, Si&#x2264;0.60 wt %, Mn&#x2264;0.60 wt %, W: 0.4-0.8 wt %, V: 0.1-0.5 wt %, Co: 0.3-0.6 wt %, Al: 0.3-1.0 wt %, Nb: 0.01-0.2 wt %, and a balance of Fe. The high temperature strength steel of the present application achieves high strength at high temperature by simultaneously precipitating both nano-coherent carbides and intermetallic compounds. It has an excellent toughness, and can be used for certain structural parts under special working conditions, such as aero-engines to increase its service life and service temperature.

Low carbon martensitic high temperature strength steel and preparation method thereof

The present application provides a hot-work die steel and a preparation method thereof wherein the chemical constituents of the hot-work die steel in mass percentage are as follows: C: 0.20-0.32 wt %, Si: &#x2264;0.5 wt %, Mn: &#x2264;0.5 wt %, Cr: 1.5-2.8 wt %, Mo: 1.5-2.5 wt %, W: 0.5-1.2 wt %, Ni: 0.5-1.6 wt %, V: 0.15-0.7 wt %, Nb: 0.01-0.1 wt %, and a balance of iron, wherein an alloying degree is 5-7%; a tensile strength of the hot-work die steel at 700&#xb0; C. is 560-700 MPa; a value of hardness of the hot-work die steel at room temperature is 32-38 HRC after holding at 700&#xb0; C. for 3-5 h; and the hot-work die steel has an elongation of 14% to 16% at room temperature, a percentage reduction of area of 48% to 65%, and an impact toughness of 52-63 J at room temperature. The hot-work die steel of the present application has an excellent thermal stability as well as a good plasticity and a toughness at room temperature.

Hot-work die steel and a preparation method thereof

Disclosed is a method and device for processing a time sequence based on dimensionality reduction, belonging to the technical field of computers. The method includes: acquiring at least one to-be-processed time sequence; processing the at least one time sequence based on Piecewise Linear Approximation (PLA) where a time length of a time segment processed by PLA is unfixed and is an integral multiple of a preset unit time length. According to the present disclosure, a space for storing a time sequence may be reduced.

Method and device for processing a time sequence based on dimensionality reduction

The embodiments provide a multi-stage phase estimation method and apparatus. The apparatus is a multi-stage phase estimation configuration. Each stage of the phase estimation configuration includes metric computation modules. Each of the metric computation modules computing a distance metric and search phase angles according to an input signal and an initial search phase angle or a search phase angle of the former stage phase estimation configuration. The number of the metric computation modules is equal to that of the search phase angles of this stage. A selection module selects the search phase angle corresponding to the minimal distance metric as the phase estimation result output of this stage according to the computation results of all metric computation modules. The average time window length of the former stage phase estimation configuration is larger than that of the subsequent stage phase estimation configuration.

Multi-stage phase estimation method and apparatus

The present invention relates to filter, coherent receiver device and coherent receiving method. The filter is used for converting a partial response signal into a full response signal, wherein the filter uses the following transfer function H(z) with respect to a partial response signal having a transfer function in which A is other item, m and n are integers larger than or equal to 0 but not being 0 at the same time, 0&#x3c;&#x3b1;&#x3c;1.

Filter, coherent receiver device and coherent receiving method

The present invention provides a method and system for automatic objects classification. The method comprises: acquiring a set of objects; classifying the objects based on query log to generate a first classification result; classifying the objects based on ontological information to generate a second classification result; and semantically fusing the first and second classification results to generate a final classification result. According to the present invention, compared with the prior arts, by semantically fusing the query log-based classification result and the ontology-based classification result, the accuracy and user-friendness of the object classification can be improved.

Method and system for automatic objects classification

Method and system for web documents clustering are provided. The method for web documents clustering includes: inputting a plurality of web documents, collecting information of the links and the directory structure of the inputted web documents, extracting, according to the collected links and directory structure, a hierarchical structure for the plurality of web documents and generating and outputting, based on the extracted hierarchical structure, one or more clusters of the plurality of web documents.

Method and system for web document clustering

Method and system to utilize the set of navigation paths of web pages as the contextual information for subject relevant web page filtering with high accuracy are provided. The method comprises the steps of: obtaining all web pages in one or more web pages collections; collecting information of the links among the obtained web pages; extracting, based on the collected links, a set of navigation paths of each of the obtained web pages; and filtering the obtained web pages based on the extracted set of navigation paths to obtain desired web pages. In some embodiments, the extraction of the navigation paths is preferably performed on the navigation links of the web pages. Therefore, the method also comprises the process for deleting non-navigation links from all the links of the web pages. Compared with the prior art, the present invention can utilize the contextual information of the web pages for web page filtering in a more sufficient way, thereby improving the accuracy and objectivity of the web page filtering.

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Beijing, China

Jianqiang Li