检索结果-南通市图书馆

On-orbit attitude planning for Earth observation imaging with star-based geometric calibration

在线全文

学校读者我要写书评

暂无评论

Science China Technological Sciences 2025年

作者： Di HUANG Zhifu WANG jianya GONG Haoran ji Institute of Aerospace Science and Technology School of Remote Sensing and Information Engineering Wuhan University State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing School of Remote Sensing and Information Engineering Wuhan University National Key Laboratory of Air-based Information Perception and Fusion Intelligent Game and Decision Laboratory

To improve the quality of remote sensing images, a novel on-orbit attitude planning method for Earth observation imaging with star-based geometric calibration is presented in this study. Unlike traditional imaging processes, the proposed method includes both pre-calibration and post-calibration stages to enhance the accuracy of satellite geometric positioning. A multiple-constraint attitude planning algorithm was developed to ensure star-based calibration, wherein the satellite camera and star sensors simultaneously capture the images of stars. This integration of cameras and multiple star sensors enables effective attitude determination. During the Earth imaging stage, a fast on-orbit attitude planning algorithm was developed to determine the satellite attitude and the optimal imaging times for ground targets. Compared with existing methods, the fast on-orbit attitude planning algorithm can significantly reduce computational time and resource consumption via initial value selection and *** demonstrate the effectiveness of the proposed attitude planning method, which was successfully applied to Wuhan 1satellite.

关键词：

^(90)Y PET/CT显像技术初探:1例报告

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中华核医学与分子影像杂志 2023年第11期43卷 689-690页

作者：郭广义施伟军倪发强嵇建峰胡许李林法浙江省肿瘤医院核医学科、中国科学院杭州医学研究所杭州310022

患者男,49岁,身高170 cm,体质量60 kg,2021年12月肠镜检查提示结肠癌,遂行结肠癌根治术,术后病理示结肠中分化腺癌淋巴结转移(3/46),术后行辅助化疗4次,后口服卡培他滨3个疗程。2022年5月本院复查CT示右肝门脉右支及腔静脉之间结节灶;MR... 详细信息

患者男,49岁,身高170 cm,体质量60 kg,2021年12月肠镜检查提示结肠癌,遂行结肠癌根治术,术后病理示结肠中分化腺癌淋巴结转移(3/46),术后行辅助化疗4次,后口服卡培他滨3个疗程。2022年5月本院复查CT示右肝门脉右支及腔静脉之间结节灶;MRI示下腔静脉前方占位,考虑为转移灶,诊断为结肠癌肝转移。入院行^(90)Y树脂微球治疗。为预测微球在肿瘤病灶和肺内的分流情况,治疗前行99Tcm-聚合白蛋白(macroaggregated albumin,MAA;上海欣科医药有限公司提供)SPECT/CT(美国GE Discovery 670型)显像,结果显示右肝肿瘤高度摄取,平均靶/本底比值为17.47;两肺弥漫轻度摄取,提示存在肺分流,肺分流分数为6%;余脏器未见异常摄取(图1),表明可以行经动脉内^(90)Y树脂微球放射治疗转移性肝癌。该治疗方法经浙江省肿瘤医院医学伦理委员会审批[批件号:IRB-2022-17号(医)]。经动脉内^(90)Y树脂微球(0.4 GBq;Sirtex Singapore Manufacturing Pte Ltd.提供)放射治疗后3 h,行PET/CT(美国GE Discovery 710型)显像:患者取仰卧位,头先进,视野包括肺和肝脏3个检查床位;先行螺旋CT扫描(管电压120 kV、自动管电流150~250 mA、螺距0.984∶1,采用迭代法重建,窗位40、窗宽400、扫描视野50 cm、层厚3.75 mm),再行三维PET显像[步进式扫描,每个床位采集20 min,床位重叠(overlap)11 mm、扫描视野70 cm,采用迭代法重建,重建算法为VUE Point,2次迭代、12个子集、矩阵192×192、截止频率7.0 mm],利用CT数据对PET图像进行衰减校正、同机融合得到融合图像。PET/CT融合图像示肝右叶下腔静脉前方软组织肿块内见显像剂明显浓聚,周围肝组织可见极少量显像剂分布,余肝脏及两肺未见明显显像剂浓聚(图2)。

关键词：浙江省肿瘤医院 SPECT/CT 下腔静脉转移性肝癌肿瘤病灶肝右叶显像剂管电压

Evapotranspiration and its components partitioning based on an improved hydrological model: historical attributions and future projections

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2025年

作者： Hong Du Sidong Zeng Yongyue ji Jun Xia College of Resources and Environmental Science， South-Central Minzu University Chongqing Institute of Green and Intelligent Technology， Chinese Academy of Sciences Chongqing School， University of Chinese Academy of Sciences State Key Laboratory of Water Resources and Hydropower Engineering Science， Wuhan University

Estimation and attribution of evapotranspiration （ET） and its components under changing environment is still a challenge but is essential for understanding the mechanisms of water and energy transfer subsequently regional water resources management. In this study， an improved hydrological model is developed to estimate evapotranspiration and its components i.e.， evaporation （E） and transpiration （T） by integrated the advantages of hydrological modeling constrained by water balance and the water-carbon close relationships. Results show that the improved hydrological model could captures ET and its components well in the study region. During the past years， annual ET and E increase obviously about 2.40mm/a and 1.42mm/a， particularly in spring and summer accounting for 90%. T shows less increasement and mainly increases in spring while it decreases in summer. Precipitation is the dominant factor and contributes 74.1% and 90.0% increases of annual ET and E， while the attribution of T changes is more complex by coupling of the positive effects of precipitation， rising temperature and interactive influences， the negative effects of solar diming and elevated CO2. In the future， ET and its components tend to increase under most of the Shared Socioeconomic Pathways （SSP） scenarios except for T decreases under the very high emissions scenario （SSP5-8.5） based on the projections. From seasonal perspective， the changes of ET and the components are mainly in spring and summer accounting for 75%， while more slightly changes are found in autumn and winter. This study highlights the effectiveness of estimating ET and its components by improving hydrological model within water-carbon coupling relationships， and more complex mechanisms of transpiration changes than evapotranspiration and evaporation changes under the interactive effects of climate variability and vegetation dynamics. Besides， decision makers should pay attention to the more increases in the undesirable E than desirab

关键词：

Aligned Ion Conduction Pathway of Polyrotaxane‑Based Electrolyte with Dispersed Hydrophobic Chains for Solid‑State Lithium–Oxygen Batteries

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 169-186页

作者： Bitgaram Kim Myeong‑Chang Sung Gwang‑Hee Lee Byoungjoon Hwang Sojung Seo ji‑Hun Seo Dong‑Wan Kim Department of Materials Science and Engineering Korea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea School of Civil Environmental and Architectural EngineeringKorea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea Materials Science and Chemical Engineering Center Institute for Advanced Engineering(IAE)Yongin 17180Republic of Korea

A critical challenge hindering the practical application of lithium–oxygen batteries(LOBs)is the inevitable problems associated with liquid electrolytes,such as evaporation and safety *** study addresses these problems by proposing a modified polyrotaxane(mPR)-based solid polymer electrolyte(SPE)design that simultaneously mitigates solvent-related problems and improves ***-SPE exhibits high ion conductivity(2.8×10^(−3)S cm^(−1)at 25℃)through aligned ion conduction pathways and provides electrode protection ability through hydrophobic chain *** this mPR-SPE into solid-state LOBs resulted in stable potentials over 300 *** situ Raman spectroscopy reveals the presence of an LiO_(2)intermediate alongside Li_(2)O_(2)during oxygen *** situ X-ray diffraction confirm the ability of the SPE to hinder the permeation of oxygen and moisture,as demonstrated by the air permeability *** present study suggests that maintaining a low residual solvent while achieving high ionic conductivity is crucial for restricting the sub-reactions of solid-state LOBs.

关键词： Solid polymer electrolyte Lithium-oxygen batteries Polyrotaxane ion conductivity Hydrophobic chain

The TOA equation for the autonomous navigation of the spacecraft based on the binary pulsar system

在线全文

学校读者我要写书评

暂无评论

The TOA equation for the autonomous navigation of the spacec...

第三届中国卫星导航学术年会

作者： Hongfei Ren 1,2 jianfeng ji 1,Qingyong Zhou 1,Min Rong 1,2 1 Institute of Surveying and Mapping,Information Engineering University,Zhengzhou 450052,China,2Xi''an Research Institute of Surveying and Mapping,Xi''an 710054,China

The binary pulsar rotates very quickly and steadily,which is one of the best resources for spacecraft *** paper simply introduced the basic characters of the binary pulsar,such as the magnitudes and distributions and so ***,the advantages and problems of binary pulsar used in the autonomous navigation were *** TOA equation of the binary pulsar was derived using the methods of Newtonian mechanics,and the Timing errors caused by the variation of orbital elements were *** post-Newtonian corrections of the Keplerian orbital elements for binary system were derived,and magnitudes of the post-Newtonian corrections were presented.

关键词： Pulsar navigation Pulsar binary TOA equation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

带钢轧机大型同步电机转子螺栓断裂原因分析

冶金设备 2018年第A1期 51-53页

作者：籍剑锋张志明王建树日照钢铁有限公司山东日照276806

大型同步电机转子螺栓螺帽处断裂导致电机内部扫堂短路接地,通过对电机运行温度、轧钢工艺及电机螺栓质量等方向进行分析。发现电机转子螺栓存在质量问题,转子的运行环境、调速控制方式等多种因素构成了螺栓寿命降低及断裂的其他原因。... 详细信息

大型同步电机转子螺栓螺帽处断裂导致电机内部扫堂短路接地,通过对电机运行温度、轧钢工艺及电机螺栓质量等方向进行分析。发现电机转子螺栓存在质量问题,转子的运行环境、调速控制方式等多种因素构成了螺栓寿命降低及断裂的其他原因。同时介绍了防止螺栓断裂因素的预防及设备管理的措施。

关键词：螺栓断裂工艺损伤

在线全文

学校读者我要写书评

暂无评论

卫星激光测高原理及其测距精度估算

测绘技术装备 2005年第2期7卷 46-48,42页

作者：姬剑锋焦文海胡国军西安测绘研究所

激光测高有着广泛的应用前景,尤其在全球表面地形确定和空间星球探测方面发挥着重要作用。本文详细介绍了激光测高的原理和精度计算,并对三种测量模式进行了比较。

关键词：精度估算测高原理测距激光卫星星球探测表面地形精度计算详细介绍测量模式和空间光测

Innovative dual-mode device integrating capacitive desalination and solar vapor generation for high-efficiency seawater desalination

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 171-179页

作者： jiacheng Wang Zhaoyu Chen Ruduan Yuan jiaxin Luo Ben Zhang Keju ji Meng Li Juanxiu Xiao Kuan Sun National Innovation Center for Industry-Education Integration of Energy Storage Technology MOE Key Laboratory of Low-grade Energy Utilization Technologies and SystemsCollege of Energy & Power Engineering Chongqing University Xuefeng Mountain Energy Equipment Safety National Observation and Research Station CQU-NUS Renewable Energy Materials & Devices Joint Laboratory Chongqing University Southwest Technology and Engineering Research Institute jiangsu Provincial Key Laboratory of Bionic Functional Materials College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics State Key Laboratory of Marine Resources Utilization in South China Sea Collaborative Innovation Center of Marine Science and Technology School of Marine Science and Engineering Hainan University

Solar-driven interface evaporation with high solar-to-steam conversion efficiency has shown great potential in seawater ***,due to the influence of latent heat and condensation efficiency,the water yield from solar-driven interface evaporation remains insufficient,posing a significant challenge that requires *** this work,we designed a dual-mode high-flux seawater desalination device that combines solar-driven interface evaporation and capacitive *** utilizing coupled desalination materials exhibiting both photothermal conversion and capacitance activity,the device demonstrated photothermal evaporation rates of 1.41 and 0.97 kg m-2h-1for condensate water yield under one-sun ***,the device exhibited a salt adsorption capacity of up to48 mg g-1and a salt adsorption rate of 2.1 mg *** addition,the salt adsorption capacity increased by approximately 32% under one-sun ***,photo-enhanced capacitive desalination performance was explored through numerical simulations and theoretical *** calculations and characterizations confirmed that the defect energy levels formed by the introduction of sulfur vacancies can effectively widen the light absorption range,improve photothermal conversion performance,and stimulate more photoelectrons to participate in capacitive ***,the electron distribution state of molybdenum disulfide with sulfur vacancies and surface defect sites contributes to ion/electron transport at the solid-liquid *** work provides a novel pathway for integrating solar vapor generation with other low-energy desalination technologies.

关键词： Desalination

南通地区创伤救治影响因素及创伤单元建设现状调查与分析

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中华卫生应急电子杂志 2024年第2期10卷 70-74页

作者：刘颖于尚平李峰季建峰南通市第一人民医院急诊科江苏南通226001 南通市第一人民医院烧伤科江苏南通226001

目的了解南通地区二、三级综合医院创伤单元建设现状和从事创伤救治的医务人员认知现状,为进一步提升本地区创伤救治能力建设提供依据。方法参考《江苏省创伤中心建设标准》基础上并结合专家意见,自行设计出南通地区院内创伤急救现况调... 详细信息

目的了解南通地区二、三级综合医院创伤单元建设现状和从事创伤救治的医务人员认知现状,为进一步提升本地区创伤救治能力建设提供依据。方法参考《江苏省创伤中心建设标准》基础上并结合专家意见,自行设计出南通地区院内创伤急救现况调查问卷,调查本地区34家二、三级医院内288名从事创伤救治工作的医务人员,对调查对象一般资料、所在医院的创伤救治工作影响因素、所在医院的院内创伤中心建设现状3个维度50个条目进行在线问卷调查。结果(1)医院的创伤救治工作影响因素:医师的水平和态度、损伤控制性技术开展及时性和重症医疗的参与等是最重要的影响因素。(2)院内创伤中心建设主要不足:50%的医院仍缺乏紧密型的创伤MDT,超过50%的医院未开展创伤救治信息化建设和质量管理;设施设备配置不足,包括杂交手术室建设、床旁影像学检查设施和自体血回输设施等。结论本地区医院创伤单元建设的同质化管理亟需进一步加强,尤其需加快信息化和质量管理体系建设,完善严重创伤急救的必备设施的配置。

关键词：创伤救治创伤单元影响因素调查分析