Magnetic shield of PMT used in DAMPE electromagnetic calorimeter

The magnetic characteristics of photomultiplier tube R5610A-01 are studied in this paper. The experimental data shows that the gain of R5610A-01 loses about 53% when the magnetic field is 3G along its +X axis. A cylinder of one-layer permalloy strip is able to reduce the effect of 3G magnetic field on the PMT's gain to less than 1%.Comment: 4 pages, 6 figures, accepted by Chinese Physics

A Review on the Role of Token Frequency in the Acquisition of Argument Structures

The role of frequency in second language acquisition has become an important focus among second language acquisition researchers. Argument structure, as one of the core topics of verbs, has always been the focus of academic attention. Frequency has a certain influence on second language construction acquisition, and the corresponding research is abundant. This paper reviews the research on the acquisition of argument structure construction with token frequency and its enlightenment to teaching, and puts forward some suggestions for future research

Microglia inflammatory response contributes to chronic constriction injury-induced neuropathic pain via miR-339/PFKFB3 axis

Purpose: To investigate the effect of miR-339 on neuropathic pain. Methods: A rat neuropathic pain model was established through chronic constriction injury (CCI). Expression of miR-339 in spinal cord was determined 14 days later. Microglial inflammatory response was evaluated using immunofluorescence analysis of ionized calcium binding adaptor molecule 1 (Iba1), while IL-6 and TNF-α were assessed by enzyme-linked immunosorbent assay (ELISA). Pain- associated behavioral effects and microglia-related inflammation were investigated after intrathecal administration of miR-339 agomir into rats post-CCI. The target gene of miR-339 involved in neuropathic pain was evaluated by a luciferase reporter assay. Microglia cells were isolated from rats, then treated with lipopolysaccharide (LPS). The LPS-induced inflammatory response in microglia cells was determined using quantitative reverse transcription PCR analysis of IL-6 and TNF-α. Results: CCI decreased mechanical allodynia and thermal hyperalgesia thresholds, but increased Iba1, IL-6, and TNF-α in rats. MiR-339 was reduced in rat spinal cord after CCI induction while intrathecal injection of miR-339 agomir alleviated CCI-induced changes in mechanical and thermal hyperalgesia in rats, and reversed expression of Iba1, IL-6, and TNF-α. Furthermore, 6-phosphofructo-2- kinase/fructose-2,6-bisphosphatase-3 (PFKFB3) was identified as a miR-339 target gene, and over- expression of miR-339 decreased the expression of PFKFB3, IL-6, and TNF-α in LPS-induced microglia cells. Conclusion: The miR-339/PFKFB3 axis ameliorates CCI-induced neuropathic pain by suppression of microglia inflammatory response, suggesting a novel strategy for neuropathic pain management

The Application of Probability Method on Mathematical Analysis

This paper summarizes the applications of probabilitymethod on mathematical analysis, including a class of generalized integra1 and acquiring the sum of infinite series £ so that contact up the mathematical analysis and probability and statistics knowledge ,explain the inner contacts among different branches of mathematics in some discussions.Key words: Probability method; Mathematical analysis; Generalized integral; The sum of infinite serie

A study of energy correction for the electron beam data in the BGO ECAL of the DAMPE

The DArk Matter Particle Explorer (DAMPE) is an orbital experiment aiming at searching for dark matter indirectly by measuring the spectra of photons, electrons and positrons originating from deep space. The BGO electromagnetic calorimeter is one of the key sub-detectors of the DAMPE, which is designed for high energy measurement with a large dynamic range from 5 GeV to 10 TeV. In this paper, some methods for energy correction are discussed and tried, in order to reconstruct the primary energy of the incident electrons. Different methods are chosen for the appropriate energy ranges. The results of Geant4 simulation and beam test data (at CERN) are presented

Enhanced SPARQL-based design rationale retrieval

Design rationale (DR) is an important category within design knowledge, and effective reuse of it depends on its successful retrieval. In this paper, an ontology-based DR retrieval approach is presented, which allows users to search by entering normal queries such as questions in natural language. First, an ontology-based semantic model of DR is developed based on the extended issue-based information system-based DR representation in order to effectively utilize the semantics embedded in DR, and a database of ontology-based DR is constructed, which supports SPARQL queries. Second, two SPARQL query generation methods are proposed. The first method generates initial SPARQL queries from natural language queries automatically using template matching, and the other generates initial SPARQL queries automatically from DR record-based queries. In addition, keyword extension and optimization is conducted to enhance the SPARQL-based retrieval. Third, a design rationale retrieval prototype system is implemented. The experimental results show the advantages of the proposed approach

Mechanism Research of Arch Dam Abutment Forces during Overload

This paper presents research on the abutment forces of a double-curvature arch dam during overload based on numerical calculation results obtained through finite element method by Ansys. Results show that, with an increase in elevation, the abutment forces and bending moment of the arch dam increase first and then decrease from the bottom to the top of the dam. Abutment forces and bending moment reach their maximum at the middle or middle-down portion of the dam. The distributions of abutment forces and moment do not change during overload. The magnitude of each arch layer’s forces and moment increases linearly during overload. This result indicates that each arch layer transmits bearing loads to the rocks of the left and right banks steadily. This research explains the operating mechanism of an arch dam under normal and overload conditions. It provides a simple method to calculate the distribution of forces Fx and Fy and a new method to calculate the overload factor of an arch dam through the estimation of arch layers based on the redistribution characteristic of arch abutment forces