改变红外线一代机磁传感器安装方式 消除探照点左右偏移

改变红外线一代机磁传感器安装方式消除探照点左右偏移石建伟刘静修（郑州铁路局月山车辆段４５４４９３焦作）１问题的提出月山车辆段在新太线修武车站（中间站）３９ｋｍ＋８９７ｍ处安装了两台一代机红外线轴温探测器，通过试用发现，该区间红外线探测站存在两个严重问...

宫调体感音乐声波在健康人体内传导的研究

目的:研究宫调体感音乐声波在正常人体的循经传导现象,以及不同经脉、不同性别对宫调体感音乐的敏感性差异。方法:自水下发射面声源宫调音乐信息,检测不同穴位及同水平组织对照点对该音乐声波接收情况。结果:足部各原穴对音乐声波存在敏感性差异,足三里对音乐声波敏感性高于对照点(P<0.05),三阴交、阴陵泉对音乐声波的敏感性存在性别差异。结论:音乐声波在正常人体内存在循经传导现象,不同经脉、不同性别对音乐声波的敏感性存在差异。

Effect of gamma irradiation on optical properties of CdSe/ZnS quantum dots embedded in PDMS

The optical properties of CdSe/ZnS quantum dots(QDs)embedded in polydimethylsiloxane(PDMS)flexible materials after irradiated withγ-rays were studied.As an embedding matrix,PDMS exhibits the advantage of high radiation hardness.The luminescence spectra and fluorescence lifetime of the irradiated and unirradiated samples were tested.The fluorescence intensity of QDs decreases with the increase of the irradiation dose according to the result of luminescence spectra.The fluorescence intensity of the QDs decreases by 80%after irradiation with a dose of 1 kGy,but the position of the emission peak and the spectral shape of the QDs remain consistent before and after irradiation.In addition,the fluorescence lifetime of QDs is shortened after irradiation.Based on the fluorescence response of QDs to the irradiation ofγ-rays and combined with flexible materials,our work provides a theoretical basis for the application of QDs as a new wearable dosimeter.

Evolution Process of Urban Spatial Pattern in Hubei Province Based on DMSP/OLS Nighttime Light Data

This paper intends to investigate the urban spatial patterns of Hubei Province and its evolution from three different perspectives: urban nodes, urban connections and urban clusters. The research adopts nighttime light imagery of cities in Hubei Province, the viewpoint of ′point-axis-area′ in the ′point-axis system′ theory, and employs light index model, gravity model and social network analysis. The findings are as follows: 1) In terms of urban nodes, the urbanization process of Hubei has been carried out mainly on the basis of external expansion rather than internal increasing. The polarization trend of urban connection network is strengthening. 2) As for urban connections, the estimation of urban connections using light index model is capable of containing various actual flow, and the connections are getting increasingly closer. 3) In regard to urban groups, seven urban groups of varying sizes have formed. On that basis, three stable and relatively independent urban groups as the centers, namely Wuchang, Yichang and Xiangyang emerge as well. But the structures of ′Wuhan Metropolitan Area′, ′Yichang-Jingzhou-Jingmen City Group′ and ′Xiangyang-Shiyen-Suizhou City Group′, which are defined by local development strategy in Hubei Province, are different from the above three urban groups.

Maximum Power Tracking for PVs with Improved Tracking Accuracy at Irradiance Transients

PV （photovoltaic） systems need MPPT （maximum power point tracking） techniques to hamess maximum power from PV arrays. P＆O （perturb ＆ observe）, and incremental conductance methods are two basic MPPT algorithms applied to PV systems with fixed and variable step sizes. However, the existing variable step MPPT method exhibits complications which occur in the algorithm due to sudden, large irradiance changes which result in dips in power extraction. This paper proposes a modification to the existing variable step MPPT method to avoid such complications and hence improve the tracking accuracy under irradiance transients. The proposed technique is experimentally verified under sudden irradiance disturbances using a solar array. The results are compared with the existing variable step method. The superiority of the proposed technique is demonstrated through a laboratory prototype.

The arresting phase determines the total healing time of a locally irradiated skin wound in swine

Objective：Radiation is an important cause of delayed wound healing,and there still exist many questions regarding the patterns and mechanisms of wound healing.This study investigated the characteristics of wound healing after varying doses of local radiation and explored possible causes of the delay in healing caused by radiation.Methods：A full-thickness dorsal longitudinal skin tissue,2 cm in diameter,was excised after local irradiation on one side of the back of swine,and the other side was wounded as a control.The size of the wound area was recorded every two days after injury.Pathological changes,proliferating cell nuclear antigen（PCNA,immunohistochemistry）and apoptosis levels（TUNEL assay）were measured at different time points after wounding.Results：The course of wound healing can be divided into four phases,namely：the arresting phase,the healing priming phase,the fast healing phase,and the healed phase.Although the total wound healing time was closely correlated to the dose of irradiation（R2=0.9758）,it was more dependent on the length of the arresting phase（R2=0.9903）because once the arresting phase ended,the wound healed at a similar speed regardless of radiation doses.Pathological analysis showed that compared with the control side there were more necrotic tissues,slower epithelial crawling,as well as fewer blood vessels and cellular components in the irradiated side at the arresting phase,while other phases revealed no significant difference concerning these measurements.Immunohistochemistry showed that the irradiated wounds had significantly less PCNA-positive and more TUNEL-positive labeling of cells in the arresting phase than in other phases.Moreover,the changes were positively related to the radiation doses,but there was no obvious difference in cell proliferation or apoptosis among the healing priming phase,fast healing phase or healed phase,whether on the control side or on the irradiated side.Conclusions：After local irradiation,the length of the arresting phase determines the wound healing time.Increased apoptosis and decreased cell proliferation might be an important reason for the formation of the arresting phase.