检索结果-南通市图书馆

Chinese Journal of Acoustics 2017年第4期36卷 385-399页

作者： GAO Xiang LI Jian SHI Fangfang ma Jun WANG Wen WANG chenghao Institute of Acoustics Chinese Academy of Sciences University of Chinese Academy of Sciences

Using the time reversal（TR）-reverse time migration（RTM） mixed method, the numerical analysis towards the acoustic field for detection and location of targets in layered media is performed. First the approaches and steps of the numerical analysis and simulation for acoustic field are proposed, then, the acoustic field distribution of single target and multiple targets are further computed by using the approaches of single emission-multiple receiving and multiple emission-multiple receiving. The numerical simulation results indicate that target detection and location can be well realized. By comparison, good results are obtained from the both two approaches, but large time-consuming is observed in way of multiple emission-multiple receiving, and so would be unacceptable. Additionally, the improved way is also proposed for multiple target detection.

关键词： migration layered reversal consuming contour receiving steps disturbance realized convolution

PuHox52 promotes coordinated uptake of nitrate,phosphate, and iron under nitrogen deficiency in Populus ussuriensis

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2023年第3期65卷 791-809页

作者： Ming Wei Mengqiu Zhang Jiali Sun Ying Zhao Solme Pak Miaomiao ma Yingxi Chen Han Lu Jingli Yang Hairong Wei Yuhua Li chenghao Li State Key Laboratory of Tree Genetics and Breeding School of ForestryNortheast Forestry UniversityHarbin 150040China College of Life Sciences Northeast Forestry UniversityHarbin 150040China College of Forest Resources and Environmental Science Michigan Technological UniversityHoughtonMichigan 49931USA Key Laboratory of Saline-alkali Vegetation Ecology Restoration(Northeast Forestry University) Ministry of EducationHarbin 150040China

It is of great importance to better understand how trees regulate nitrogen(N) uptake under N deficiency conditions which severely challenge afforestation practices, yet the underlying molecular mechanisms have not been well elucidated. Here,we functionally characterized PuHox52, a Populus ussuriensis HD-ZIP transcription factor, whose overexpression greatly enhanced nutrient uptake and plant growth under N deficiency. We first conducted an RNA sequencing experiment to obtain root transcriptome using PuHox52-overexpression lines of P. ussuriensis under low N treatment. We then performed multiple genetic and phenotypic analyses to identify key target genes of PuHox52 and validated how they acted against N deficiency under PuHox52 ***52 was specifically induced in roots by N deficiency, and overexpression of PuHox52promoted N uptake, plant growth, and root development. We demonstrated that several nitrate-responsive genes(PuNRT1.1, PuNRT2.4,PuCLC-b, PuNIA2, PuNIR1, and PuNLP1),phosphate-responsive genes(PuPHL1A and PuPHL1B), and an iron transporter gene(PuIRT1) were substantiated to be direct targets of PuHox52. Among them, PuNRT1.1, PuPHL1A/B, and PuIRT1 were upregulated to relatively higher levels during PuHox52-mediated responses against N deficiency in PuHox52-overexpression lines compared to WT. Our study revealed a novel regulatory mechanism underlying root adaption to N deficiency where PuHox52 modulated a coordinated uptake of nitrate, phosphate, and iron through 'PuHox52-PuNRT1.1', 'PuHox52-PuPHL1A/PuPHL1B', and'PuHox52-PuIRT1' regulatory relationships in poplar roots.

关键词： HD-Zip transcription factor iron transport nitrate transport nitrogen deprivation phosphate absorption Populus ussuriensis root architecture target gene

基于maxEnt模型和ArcGIS的金槐生态适宜性区划研究

在线全文

学校读者我要写书评

暂无评论

中国中医药信息杂志 2024年第6期31卷 1-6页

作者：王彦珺苏鑫宇朱成豪张淑睿马思宇傅平国孙志蓉北京中医药大学中药学院北京102488 衡阳县华盛达农林科技有限公司湖南衡阳421000

目的预测金槐在全国范围内的潜在适宜分布区,为金槐资源开发及扩大种植等提供参考。方法收集85条金槐样点分布信息,结合72个环境因子数据,应用最大熵(maxEnt)模型和地理信息系统软件ArcGIS分析影响金槐适宜性分布的主导环境因子及潜在... 详细信息

目的预测金槐在全国范围内的潜在适宜分布区,为金槐资源开发及扩大种植等提供参考。方法收集85条金槐样点分布信息,结合72个环境因子数据,应用最大熵(maxEnt)模型和地理信息系统软件ArcGIS分析影响金槐适宜性分布的主导环境因子及潜在适宜区分布情况。结果影响金槐的5个主导环境因子分别是最干月降水量、5月份光照辐射、11月份降水量、9月份平均气温和10月份光照辐射。金槐的全国潜在适宜分布区主要集中于湖南省中南部与广西壮族自治区东北部相邻地带。结论本研究结果可为金槐种植栽培区域选择及野生资源保护提供参考。

关键词：金槐最大熵模型环境因子适宜性分布

Carbon Nanosheets Encapsulated NiSb Nanoparticles as Advanced Anode materials for Lithium-Ion Batteries

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental materials 2020年第2期3卷 186-191页

作者： Qichang Pan Yanan Wu Wentao Zhong Fenghua Zheng Youpeng Li Yanzhen Liu Junhua Hu chenghao Yang Guangzhou Key Laboratory for Surface Chemistry of Energy materials School of Environment and EnergyNew Energy Research InstituteSouth China University of TechnologyGuangzhou 510006China School of materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Metallic antimony(Sb) has been attracted much attentions as anode for lithium-ion batteries due to its high ***,the large volume expansion during the lithiation process leads to poor electrochemical performance,which seriously limits the practical application in lithium-ion ***,NiSb nanoparticles encapsulated by carbon nanosheets have been developed via a facile strategy and as anode for lithium-ion *** this attractive structure,the carbon nanosheets can effectively avoid volume change of NiSb nanoparticles and inhibit the direct contact of NiSb nanoparticles to the electrolyte during the lithiation/delithiation *** a result,the NiSb/C nanosheets display an outstanding long cycling performance(405 ma h g-1 after 1000 cycles at 1.0 A g-1) and excellent rate capability(305 ma h g-1 at 2.0 A g-1) when application in lithium-ion batteries.

关键词： anode carbon nanosheets lithium-ion batteries NiSb alloy

Acute myeloid leukemia following a primary mediastinal germ cell tumor

在线全文

学校读者我要写书评

暂无评论

Pediatric Investigation 2020年第3期4卷 218-221页

作者： Huimin Hong Yan Su chenghao Chen Lejian He Shuai Zhu Wei Lin Mei Jin Xisi Wang Ruidong Zhang Huyong Zheng Qi Zeng Xiaoli ma Beijing Key Laboratory of Pediatric Hematology Oncology/National Discipline of Pediatrics Ministry of Education/MOE Key Laboratory of Major Diseases in Children/Hematology Oncology CenterBeijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthBeijingChina Department of Pathology Beijing Children's HospitalCapital Medical UniversityNational Centre for Children's HealthBeijingChina Department of Thoracic Surgery Beijing Children's HospitalCapital Medical UniversityNational Centre for Children's HealthBeijingChina

Introduction:There is a known association between primary mediastinal germ cell tumor(PMGCT)and hematologic malignancy that is not linked to *** are exceptionally rare entities with a low morbidity and a poor *** presentation:An 11-year-old boy presented with an anterior mediastinal mass diagnosed as a malignant germ cell tumor on the basis of an excisional *** was found to have acute myeloid leukemia(AML)two years after the chemotherapy for his germ cell *** clinical course was very aggressive with a survival time of only 1 week after diagnosis of AML associated with ***:AML associated with PMGCT needs to be diagnosed *** examinations should be carried out in patients with PMGCTs during and after chemotherapy,and long-term follow-up is still necessary to reduce the risk of morbidity and mortality.

关键词： Primary mediastinal germ cell tumor Acute myeloid leukemia Chemotherapy

美国利率调整和税率调整的影响与我国应对措施研究

在线全文

学校读者我要写书评

暂无评论

经济研究 2021年第1期56卷 172-190页

作者：马理文程浩湖南大学金融与统计学院 410079 武汉大学经济与管理学院 430072

美国近年来针对经济发展状况频繁调整利率政策与税率政策,这些政策对其他国家有较强的溢出效应,但目前对其传导机理与传导效果尚缺乏深度的理论分析。本文构建了两国的动态随机一般均衡(DSGE)模型,在开放经济背景下研究了美国的利率调整... 详细信息

美国近年来针对经济发展状况频繁调整利率政策与税率政策,这些政策对其他国家有较强的溢出效应,但目前对其传导机理与传导效果尚缺乏深度的理论分析。本文构建了两国的动态随机一般均衡(DSGE)模型,在开放经济背景下研究了美国的利率调整(以加息为替代)与税率调整(以减税为替代)对中国经济的影响。结论显示:美国加息会对中国经济产生较大的负面冲击,在短期内会导致中国的产出、资本投入、净出口与就业率出现下降,在长期中,虽然下降趋势有所缓和,但对资本外流与净出口的负面影响非常大;美国减税在短期内对中国经济有负向冲击,但在长期中影响较弱。相应的政策建议是:认真评估美国利率调整的冲击方向、力度和影响,关注国内的通胀水平与进出口,向市场灵活适度的定向提供流动性,增加产出与提高就业率;加强监控,采取必要措施防止资本外逃与净出口下降;减税降费降低企业经营成本,推进经济结构调整;预估可能产生的贸易摩擦与政治矛盾,提前做好防范预案。

关键词：美国利率调整美国税率调整对中国的影响应对措施

Constructing oxygen-deficient V_(2)O_(3)@C nanospheres for high performance potassium ion batteries

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第3期34卷 507-511页

作者： Qiang Deng Luolan Wang Jing Li Qian Cheng Xiaozhao Liu Changdong Chen Qimeng Zhang Wentao Zhong Hua Wang Lijue Wu chenghao Yang Guangzhou Key Laboratory for Surface Chemistry of Energy materials New Energy Research InstituteSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510006China Guangdong Jiana Energy Technology Co. Ltd.Qingtang TownYingde 513056China

Potassium ion batteries(PIBs) have been regarded as promising alternatives to lithium ion batteries(LIBs)on account of their abundant resource and low cost in large scale energy storage applications. However,it still remains great challenges to explore suitable electrode materials that can reversibly accommodate large size of potassium ions. Here, we construct oxygen-deficient V_(2)O_(3)nanoparticles encapsulated in amorphous carbon shell(Od-V_(2)O_(3)@C) as anode materials for PIBs by subtly combining the strategies of morphology and deficiency engineering. The MOF derived nanostructure along with uniform carbon coating layer can not only enables fast K+migration and charge transfer kinetics, but also accommodate volume change and maintain structural stability. Besides, the introduction of oxygen deficiency intrinsically tunes the electronic structure of materials according to DFT calculation, and thus lead to improved electrochemical performance. When utilized as anode for PIBs, Od-V_(2)O_(3)@C electrode exhibits superior rate capability(reversible capacities of 262.8, 227.8, 201.5, 179.8, 156.9 mah/g at 100, 200, 500, 1000 and2000 ma/g, respectively), and ultralong cycle life(127.4 mah/g after 1000 cycles at 2 A/g). This study demonstrates a feasible way to realize high performance PIBs through morphology and deficiency engineering.

关键词： V_(2)O_(3)@C Nanospheres Oxygen deficiency Potassium ion batteries Anode

发达国家货币政策的分化调整对中国经济的影响与风险防范

在线全文

学校读者我要写书评

暂无评论

世界经济研究 2019年第10期 35-50,M0003页

作者：马理文程浩钱成武汉大学经济与管理学院

当前,发达国家的货币政策出现了分化调整的新动态,处于政策夹缝中的中国需要评估发达国家货币政策的分化调整可能带来的风险并制定应对措施。文章建立了开放经济条件下的DSGE三国模型,研究发达国家货币政策的分化调整对中国经济的影响,... 详细信息

当前,发达国家的货币政策出现了分化调整的新动态,处于政策夹缝中的中国需要评估发达国家货币政策的分化调整可能带来的风险并制定应对措施。文章建立了开放经济条件下的DSGE三国模型,研究发达国家货币政策的分化调整对中国经济的影响,并基于此提出风险对冲的一系列对策建议。研究认为:美国紧缩货币政策可能导致中国产出下降,消费萎缩,资本投入下降,短期通胀有可能上升,并降低就业率水平;欧洲宽松货币政策可能导致中国产出上升,消费下降,资本投入上升,通胀和就业率水平可能下滑;中国本国的技术冲击可以适当缓解发达国家货币政策分化调整带来的不利影响。文章提出相应的政策建议是:大力推进供给侧结构性改革,加强技术创新,实施定向调控类的货币政策,通过差异化的策略组合来对冲发达国家货币政策分化调整带来的不确定性。

关键词：货币政策利率政策贸易经济 DSGE三国模型

m6A甲基转移酶KIAA1429转染对结肠癌细胞增殖的影响及机制探讨

在线全文

学校读者我要写书评

暂无评论

老年医学研究 2023年第2期4卷 19-24页

作者：叶春水商亮刘源马成昊种微陈浩李乐平山东大学山东济南250021 山东省立医院胃肠外科山东济南250021 山东大学齐鲁医院临床流行病学研究室山东济南250021

目的观察m6A甲基转移酶KIAA1429转染对结肠癌细胞增殖的影响,并探讨其机制。方法通过慢病毒转染的方法在人结肠癌细胞RKO中构建稳定敲低KIAA1429的对照组和实验组细胞系,将其分别命名为sh-NC组、shKIAA1429组,在人结肠癌细胞LS180中... 详细信息

目的观察m6A甲基转移酶KIAA1429转染对结肠癌细胞增殖的影响,并探讨其机制。方法通过慢病毒转染的方法在人结肠癌细胞RKO中构建稳定敲低KIAA1429的对照组和实验组细胞系,将其分别命名为sh-NC组、shKIAA1429组,在人结肠癌细胞LS180中构建稳定过表达KIAA1429的对照组和实验组细胞系,将其分别命名为OE-NC组、OE-KIAA1429组。采用Western blotting法检测KIAA1429蛋白来验证转染效率,采用CCK-8实验和平板克隆实验检测KIAA1429转染对结肠癌细胞增殖的影响,通过差异基因的富集分析预测KIAA1429转染对结肠癌细胞增殖的影响机制,采用流式细胞术检测KIAA1429转染对细胞周期的影响,采用Western blotting法观察OE-NC组和OE-KIAA1429组细胞内E2F1、CyclinB1、p21蛋白变化。结果 sh-NC组、sh-KIAA1429组KIAA1429蛋白相对表达量分别为0.979±0.028、0.299±0.138,两组比较P=0.002;OE-NC组、OE-KIAA1429组KIAA1429蛋白相对表达量分别为0.446±0.104、0.899±0.153,两组比较P=0.026。CCK-8实验和平板克隆实验结果显示,KIAA1429显著促进了结肠癌细胞的增殖(P均<0.05)。KEGG富集分析提示差异基因主要于细胞周期相关的信号通路得到富集,GO富集分析提示差异基因的功能与遗传物质的复制及细胞周期相关。流式细胞术结果显示,RKO细胞中sh-NC组和sh-KIAA1429组的G0/G1期所占百分比分别为52.07%±1.00%、58.57%±0.98%,两组相比P=0.003;LS180细胞中OE-NC组和OE-KIAA1429组的G0/G1期所占百分比分别为68.37%±0.82%、62.40%±1.34%,两组相比P=0.006。OE-NC组CyclinB1、E2F1、p21蛋白相对表达量分别为0.491±0.116、0.661±0.132、1.007±0.058,OE-KIAA1429组分别为1.254±0.169、1.125±0.135、0.725±0.110,两组相比P均<0.05。结论 m6A甲基转移酶KIAA1429通过调控细胞周期信号通路进而促进结肠癌细胞增殖。

关键词： m6A甲基转移酶 KIAA1429 病毒转染细胞增殖细胞周期结肠癌

维普期刊数据库博看期刊

Determination of Kaempferol Content in 10 Batches of Different Production Areas of Yao Medicine Lysimachia foenum-graecum Hance

在线全文

学校读者我要写书评

暂无评论

Medicinal Plant 2021年第2期12卷 21-23,29页

作者： Yangning OU chenghao ZHANG Xiumei ma Jiangcun WEI Wen ZHONG Lihua YU Yusheng HUANG Lizhen CAO Hezhou Hospital of Traditional Chinese Medicine Hezhou 542899 China Guangxi International Zhuang Medicine Hospital Nanning 530201 China

[Objectives]To determine the kaempferol content in Yao medicine Lysimachia foenum-graecum Hance.[Methods]The high performance liquid chromatography(HPLC)method was *** chromatographic column:Inertsil ODS-3 C18 column(4.60 mm×250 mm,5μm);mobile phase:acetonitrile-0.1%glacial acetic acid;flow rate:1.0 mL/min;column temperature:30℃;detection wavelength:360 nm;sample injection volume:10μL.[Results]The kaempferol content in Yao medicine ***-graecum was determined,Y=20652X-151098(R=0.9997)shows a good linear relationship within the linear range of 9.80-156.8μg/mL.[Conclusions]The high performance liquid chromatography(HPLC)method was established for determining the kaempferol content in Yao medicine *** method is expected to provide a scientific basis for the formulation of quality control methods for ***-graecum.

关键词： Lysimachia foenum-graecum Hance. Kaempferol High performance liquid chromatography(HPLC)