检索结果-南通市图书馆

茯苓酸对牙周炎大鼠牙槽骨吸收和炎症反应的影响及机制

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

山东医药 2024年第16期64卷 47-51页

作者：杜宇尹华强王菊郑益阳成都市中西医结合医院口腔科成都610041 成都市中西医结合医院检验科

目的探讨茯苓酸(PA)对牙周炎大鼠牙槽骨吸收、炎症反应的影响及机制。方法将108只大鼠随机分为对照组(Control组)、模型组(Model组)、1 mg/kg茯苓酸(PA-L组)、5 mg/kg茯苓酸(PA-M组)、10 mg/kg茯苓酸(PA-H组)、10 mg/kg茯苓酸+10 mg/kg ... 详细信息

目的探讨茯苓酸(PA)对牙周炎大鼠牙槽骨吸收、炎症反应的影响及机制。方法将108只大鼠随机分为对照组(Control组)、模型组(Model组)、1 mg/kg茯苓酸(PA-L组)、5 mg/kg茯苓酸(PA-M组)、10 mg/kg茯苓酸(PA-H组)、10 mg/kg茯苓酸+10 mg/kg CXCL12(PA-H+CXCL12组),每组18只。除Control组外,其他各组均构建牙周炎模型。造模后,PA-L组、PA-M组、PA-H组分别经腹腔注射1、5、10 mg/kg茯苓酸,PA-H+CXCL12组经腹腔注射10 mg/kg茯苓酸+10 mg/kg CXCL12,Control组、Model组均经腹腔注射等量生理盐水,1天1次,连续给药4周。检测牙周指数[菌斑指数(PLI)评分、出血指数(SBI)评分];取各组大鼠腹主动脉血,ELISA法检测血清TNF-α、IL-6、IL-1β;用micro-CT测量牙槽嵴顶到釉牙骨质界的距离(CEJ-AC),观察牙槽骨吸收情况;HE染色后观察牙周组织病理变化;免疫组化法检测牙周组织中IL-1β、OPG蛋白表达;Western blotting法检测牙周组织中趋化因子12(CX-CL12)、趋化因子受体4(CXCR4)蛋白表达。结果与Control组比较,Model组牙龈上皮出现糜烂,有大量的炎症细胞浸润,组织水肿,结构损伤,排列紊乱,牙槽骨高度明显降低,可见大量骨吸收陷窝,PLI评分、SBI评分、CEJ-AC、TNF-α、IL-6、IL-1β及CXCL12、CXCR4蛋白表达高,OPG蛋白表达低(P均<0.05);与Model组比较,PA-L组、PA-M组、PA-H组牙周组织炎症逐渐减轻,结构损伤减轻,牙槽骨高度变浅,PLI评分、SBI评分、CEJ-AC、TNF-α、IL-6、IL-1β及CX-CL12、CXCR4蛋白表达依次降低,OPG蛋白表达依次升高(P均<0.05);与PA-H组比较,PA-H+CXCL12组牙周组织炎症加重,水肿明显,结构排列紊乱,损伤严重,PLI评分、SBI评分、CEJ-AC、TNF-α、IL-6、IL-1β、CXCL12、CXCR4蛋白表达高,OPG蛋白表达低(P均<0.05)。结论茯苓酸可通过调控CXCL12/CXCR4信号通路抑制牙周炎大鼠牙槽骨吸收,减轻炎症反应。

关键词：牙周炎茯苓酸趋化因子12/趋化因子受体4 牙槽骨吸收炎症反应大鼠

维普期刊数据库博看期刊

Research on Surface Information Extraction Based on Deep Learning and Transfer Learning

在线全文

学校读者我要写书评

暂无评论

Journal of Geoscience and Environment Protection 2023年第10期11卷 67-78页

The land cover types in South China are varied, and the terrain is undulating, and the area of different land types is small, and the remote sensing monitoring work was difficult. In order to solve these problems, an automatic classification method based on transfer learning and convolutional neural network model was established in this paper, with a total classification accuracy of 98.1611%. This paper proposes a land use classification remote sensing method based on deep learning, which improved the automation level and monitoring accuracy of complex land surface remote sensing monitoring in South China, and it provided technical support for the land consolidation work in China.

关键词： Land Classification Convolution Neural Network Transfer Learning

Remote Sensing Landslide Monitoring Based on Machine Learning Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geoscience and Environment Protection 2023年第10期11卷 87-105页

The susceptibility evaluation of landslides has become one of the key environmental issues that people are concerned about. This study took the land-slides in Xishuangbanna, Yunnan Province as the study object, and selected 10 evaluation factors such as digital elevation model (DEM), slope aspect, precipitation, land use, water system, roads, population density, lithology, faults, and NDVI. Different machine learning methods were compared and studied, and the ROC (receiver operating characteristics) curve verification revealed that the accuracy of the random forest evaluation model was high. In the prediction and evaluation of the susceptibility of landslides, five risk levels were divided. After the superimposed analysis, 87.26% of the disaster points fell in the first and second susceptibility areas. The spot analysis found that the distribution of hot spots is consistent with the distribution of disaster spots. In a word, the results of this study can provide better technical support for the evaluation and early warning of landslides in Southwest China.

关键词： Landslide Evaluation Index Random Forest Geological Disaster

Research on Extraction Method of Surface Information Based on Multi-Feature Combination Such as Fractal Texture

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geoscience and Environment Protection 2023年第10期11卷 50-66页

Because of the developed economy and lush vegetation in southern China, the following obstacles or difficulties exist in remote sensing land surface classification: 1) Diverse surface composition types;2) Undulating terrains;3) Small fragmented land;4) Indistinguishable shadows of surface objects. It is our top priority to clarify how to use the concept of big data (Data mining technology) and various new technologies and methods to make complex surface remote sensing information extraction technology develop in the direction of automation, refinement and intelligence. In order to achieve the above research objectives, the paper takes the Gaofen-2 satellite data produced in China as the data source, and takes the complex surface remote sensing information extraction technology as the research object, and intelligently analyzes the remote sensing information of complex surface on the basis of completing the data collection and preprocessing. The specific extraction methods are as follows: 1) extraction research on fractal texture features of Brownian motion;2) extraction research on color features;3) extraction research on vegetation index;4) research on vectors and corresponding classification. In this paper, fractal texture features, color features, vegetation features and spectral features of remote sensing images are combined to form a combination feature vector, which improves the dimension of features, and the feature vector improves the difference of remote sensing features, and it is more conducive to the classification of remote sensing features, and thus it improves the classification accuracy of remote sensing images. It is suitable for remote sensing information extraction of complex surface in southern China. This method can be extended to complex surface area in the future.

关键词： Complex Surface Remote Sensing Information Extraction Remote Sensing Land Classification Transfer Learning Brownian Motion Fractal Texture

High-speed GeSn resonance cavity enhanced photodetectors for a 50 Gbps Si-based 2 μm band communication system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2024年第4期12卷 767-773页

作者： JINLAI CUI JUN zheng YUPENG ZHU XIANGQUAN LIU yiyang WU QINXING HUANG YAZHOU YANG ZHIPENG LIU ZHI LIU YUHUA ZUO BUWEN CHENG Key Laboratory of Optoelectronic Materials and Devices Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Expanding the optical communication band is one of the most effective methods of overcoming the nonlinear Shannon capacity limit of single *** this study,GeSn resonance cavity enhanced(RCE)photodetectors(PDs)with an active layer Sn component of 9%–10.8%were designed and fabricated on an SOI *** GeSn RCE PDs present a responsivity of 0.49 A/W at 2μm and a 3-dB bandwidth of approximately 40 GHz at 2μ***,Si-based 2μm band optical communication with a transmission rate of 50 Gbps was demonstrated by using a GeSn RCE *** work demonstrates the considerable potential of the Si-based 2μm band photonics in future high-speed and high-capacity optical communication.

关键词： resonance system approximate

基于MSOP的蒸汽动力系统单参数运行稳定性评估方法

在线全文

学校读者我要写书评

暂无评论

上海交通大学学报 2021年第11期55卷 1438-1444页

作者：郑奕扬倪何金家善海军92118部队浙江舟山316000 海军工程大学动力工程学院武汉430033 海军工程大学船舶与海洋学院武汉430033

针对当前蒸汽动力系统缺乏有效稳定性评估方法的问题,提出一种适用于单个运行参数的稳定性评估方法.该方法是一种复合评估方法,首先综合运用中值回归经验模态分解和奇异值分解,对运行参数的时间序列进行分解并提取其隐藏的趋势项,然后... 详细信息

针对当前蒸汽动力系统缺乏有效稳定性评估方法的问题,提出一种适用于单个运行参数的稳定性评估方法.该方法是一种复合评估方法,首先综合运用中值回归经验模态分解和奇异值分解,对运行参数的时间序列进行分解并提取其隐藏的趋势项,然后依据各分量的最佳算法参数排列熵选取分量进行重构,最后通过非平稳时间序列分析中常用的整合滑动平均自回归模型预测趋势项和扰动项的走势并提取两者的分布特征,进而计算得到运行参数在预测趋势上各点的失稳概率并由此对其稳定性进行定量评估.经实际案例验证,证明该方法能够有效评估蒸汽动力系统单参数的运行稳定性,具有一定的理论创新性和工程应用价值.

关键词：中值回归经验模态分解排列熵失稳概率稳定性评估

Boosting High-Voltage Practical Lithium Metal Batteries with Tailored Additives

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第12期16卷 23-41页

作者： Jinhai You Qiong Wang Runhong Wei Li Deng yiyang Hu Li Niu Jingkai Wang Xiaomei zheng Junwei Li Yao Zhou Jun-Tao Li College of Energy Xiamen UniversityXiamen 361005People’s Republic of China Magnetism Key Laboratory of Zhejiang Province College of Materials and ChemistryChina Jiliang UniversityHangzhou 310018People’s Republic of China Laboratory for Soft Matter and Biophysics Department of Physics and AstronomyKU Leuven3001 LeuvenBelgium State Key Lab of Physical Chemistry of Solid Surface College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005People’s Republic of China Department of Chemical Engineering KU LeuvenCelestijnenlaan 200F3001 LeuvenBelgium College of Chemistry and Chemical Engineering Northwest Normal UniversityLanzhou 730070GansuPeople’s Republic of China

The lithium(Li)metal anode is widely regarded as an ideal anode material for high-energy-density ***,uncontrolled Li dendrite growth often leads to unfavorable interfaces and low Coulombic efficiency(CE),limiting its broader ***,an ether-based electrolyte(termed FGN-182)is formulated,exhibiting ultra-stable Li metal anodes through the incorporation of LiFSI and LiNO3 as dual *** synergistic effect of the dual salts facilitates the formation of a highly robust SEI film with fast Li+transport ***,Li||Cu half cells exhibit an average CE reaching up to 99.56%.In particular,pouch cells equipped with high-loading lithium cobalt oxide(LCO,3 mAh cm^(-2))cathodes,ultrathin Li chips(25μm),and lean electrolytes(5 g Ah-1)demonstrate outstanding cycling performance,retaining 80%capacity after 125 *** address the gas issue in the cathode under high voltage,cathode additives 1,3,6-tricyanohexane is incorporated with FGN-182;the resulting high-voltage LCO||Li(4.4 V)pouch cells can cycle steadily over 93 *** study demonstrates that,even with the use of ether-based electrolytes,it is possible to simultaneously achieve significant improvements in both high Li utilization and electrolyte tolerance to high voltage by exploring appropriate functional additives for both the cathode and anode.

关键词： Li metal anode Li dendrites LiNO3 1,3,6-tricyanohexane Pouch cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

考虑给水泄漏的锅炉升负荷仿真及其可靠性

上海交通大学学报 2021年第4期55卷 444-454页

作者：倪何覃海波郑奕杨海军工程大学动力工程学院武汉430033 海军航空大学青岛校区山东青岛266041

针对常规蒸汽动力系统在锅炉升负荷过程中,由于给水卸载管路泄漏导致的锅炉失水和泵汽蚀问题,采用基于残差修正的差异演化算法辨识获得增压泵和给水泵各级叶轮的扬程-流量-转速模型,采用机理建模方法建立给水系统管路和阀门的流量-阻力... 详细信息

针对常规蒸汽动力系统在锅炉升负荷过程中,由于给水卸载管路泄漏导致的锅炉失水和泵汽蚀问题,采用基于残差修正的差异演化算法辨识获得增压泵和给水泵各级叶轮的扬程-流量-转速模型,采用机理建模方法建立给水系统管路和阀门的流量-阻力模型、工质参数计算模型以及给水卸载调节阀的性能退化模型.在此基础上,对锅炉升负荷过程进行了仿真研究,获得了给水系统主要参数在不同给水卸载流量下的变化情况,发现给水卸载管路调节阀的性能退化是导致锅炉升负荷过程中锅炉失水和泵汽蚀的主要原因之一.为进一步明确给水系统的性能可靠性随工作时间的退化规律,采用数学模型与Monte Carlo随机抽样的联合仿真方法,对某型船用给水系统在锅炉升负荷过程的性能可靠性进行了仿真研究,获得了该型锅炉在总体性能可靠度变化和给水卸载管路调节阀的性能可靠寿命.研究成果揭示了一种蒸汽动力系统特有故障的故障机制及其退化规律,具有一定的理论创新和工程应用价值.

关键词：锅炉升负荷过程给水泄漏仿真性能可靠性

在线全文

学校读者我要写书评

暂无评论

基于PLS的增压锅炉运行失稳概率修正计算

兵器装备工程学报 2021年第8期42卷 94-99页

作者：郑奕扬倪何金家善海军工程大学动力工程学院武汉430033 海军工程大学船舶与海洋学院武汉430033

为定量评估增压锅炉的运行稳定性,基于增压锅炉的工作原理,选取锅炉水位和锅炉汽压的失稳概率作为增压锅炉运行稳定性的评估指标。失稳概率为锅炉水位和锅炉汽压超过极限值的概率,基于时间序列趋势预测算法得到锅炉水位和锅炉汽压的预... 详细信息

为定量评估增压锅炉的运行稳定性,基于增压锅炉的工作原理,选取锅炉水位和锅炉汽压的失稳概率作为增压锅炉运行稳定性的评估指标。失稳概率为锅炉水位和锅炉汽压超过极限值的概率,基于时间序列趋势预测算法得到锅炉水位和锅炉汽压的预测趋势;以预测趋势值和原时序的方差计算失稳概率;分析锅炉水位和锅炉汽压的相关参数,通过偏最小二乘回归分析得到拟合函数修正失稳概率,使失稳概率更接近实际情况。最终得到未来90s内锅炉水位和锅炉汽压的修正失稳概率,定量地评估了增压锅炉的运行稳定性,可为增压锅炉运行稳定性管理提供技术支持,为蒸汽动力系统的运行稳定性评估奠定基础。

关键词：增压锅炉偏最小二乘回归失稳概率运行稳定性