检索结果-南通市图书馆

Identification method and empirical study of urban industrial spatial relationship based on POI big data: a case of Shenyang City, China

引用

Geography and Sustainability 2020年第2期1卷 152-162页

作者： bing xue Xiao Xiao Jingzhong Li Key Lab of Pollution Ecology and Environmental Engineering Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Key Lab for Environmental Computation and Sustainability of Liaoning Province Shenyang 110016China University of Chinese Academy of Sciences Beijing 100049China College of Urban Planning and Architecture Xuchang UniversityXuchang 461000China

The industrial spatial relationship is a cross-cutting subject of economic geography and geographical information science which has considerable significance to promote a sustainable planning and development of regional economic *** Shenyang City as our study area and using the location information of manufacturing units and automobile sales outlets extracted from points of interest(POI),we investigated the spatial relationship between the two industries from integration,correlation and coordination *** on spatial statistical analyses,the equipment manufacturing industry and the automobile sales industry in Shenyang City showed a spatial complementary integration,weak spatial correlation,and coordination with scale dependence and spatial heterogeneity in *** distribution characteristic is attributed to:1)local policy factors(i.e.,that industrial land should be located in the periphery of the city or outside the Second Ring Road),and 2)the economic factors(i.e.,that the degree of dependence of the equipment manufacturing industry and automobile sales industry were also influenced by external factors such as costs).These results improved the current industrial spatial relationship analysis by developing a new framework based on POI big data in order to accelerate a coordinated development between manufacturing and service industries and to promote the construction of industrial ecosystem.

关键词： Human-land relationship POI Space organization Industrial ecology

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Estimating Black Hole Masses of AGNs using Ultraviolet Emission Line Properties

引用

Chinese Journal of Astronomy and Astrophysics 2006年第4期6卷 396-410页

作者： Min-Zhi Kong xue-bing Wu Ran Wang Jin-Lin Han National Astronomical Observatories Chinese Academy of Sciences Beiiing 1000121 Department of Astronomy Peking University Beijing 100871

Based on measured broad line region sizes in the reverberation-mapping AGN sample, two new empirical relations are introduced to estimate the central black hole masses of radio-loud high-redshift （z 〉 0.5） AGNs. First, using the archival IUE/HST spectroscopy data at UV band for the reverberation-mapping objects, we obtained two new empirical relations between the BLR size and Mg Ⅱ/C Ⅳ emission line luminosity. Secondly, using the newly determined black hole masses of the reverberation-mapping sample as calibration, we found two new relationships for determining the black hole mass with the full width at half maximum and the luminosity of Mg Ⅱ/C Ⅳ line. We then apply the relations to estimate the black hole masses of the AGNs in the Large Bright Quasar Survey and a sample of radio-loud quasars. For the objects with small radio-loudness, the black hole mass estimated using the RBLR-LMg Ⅱ/C Ⅳ relation is consistent with that from the RBLR-L3000 A/1350 A relation. For radio-loud AGNs, however, the mass estimated from the RBLR-LMg Ⅱ/C Ⅳ relation is systematically lower than that from the continuum luminosity L3000 A/13S0 A Because jets could have significant contributions to the UV/optical continuum luminosity of radio-loud AGNs, we emphasize once again that for radio-loud AGNs, the emission line luminosity may be a better tracer of the ionizing luminosity than the continuum luminosity, so that the relations between the BLR size and UV emission line luminosities should be used to estimate the black hole masses of high redshift radio-loud AGNs.

关键词： galaxies: nucleus -- galaxies: high-redshift-- quasars: emission lines -- ultraviolet: galaxies

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Early Sensor Fault Detection Based on PCA and Clustering Analysis

引用

Journal of Harbin Institute of Technology(New Series) 2014年第6期21卷 113-120页

作者： xue-bing Gong Ri-Xin Wang Min-Qiang Xu Deep Space Exploration Research Center Harbin Institute of Technology

This paper proposes a novel scoring index for the early sensor fault detection in order to make full use of massive archived spacecraft telemetry *** early detection of sensor faults is made by using the index constructed by the K-means algorithm and PCA *** sensor fault detection includes the learning phase and monitoring *** amplitude of sensor fault has been always increasing when the performance of sensors deteriorates during a *** proposed index can detect the smaller sensor faults than the squared prediction error( SPE) index which means it can discover the sensor faults earlier than the *** simulation results demonstrate the effectiveness and feasibility of the proposed index which can decrease the check-limit as much as 40% than SPE in the same magnitude of bias sensor fault.

关键词： early fault detection PCA K-means algorithm SPE Sensor faults

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of cupric ions on the corrosion behavior of aluminum alloy 5A02 in ethylene glycol–water solution

引用

International Journal of Minerals,Metallurgy and Materials 2017年第4期24卷 423-431页

作者： Shu-lun Gao Mei Yu Jian-hua Liu bing xue Song-mei Li School of Materials Science and Engineering Beihang University Beijing 100191 China

The effects of cupric ions on the corrosion behavior of aluminum alloy 5A02 in ethylene glycol–water solutions were studied by potentiodynamic polarization,electrochemical noise(EN),and complementary techniques including scanning electron microscopy(SEM),atomic force microscopy(AFM),and X-ray photoelectron spectroscopy(XPS). A positive corrosion potential and increased corrosion current were observed due to the deposition of copper. The results demonstrate that the main corrosion type was pitting and the increasing cupric ion concentration augmented the pitting density. The pits became larger and deeper as a result of the embedment of copper into the surface of the alloy. Cupric ions were preferentially deposited at the defects around the secondary phase,leading to the formation of Al–Cu microgalvanic couples,which increased the corrosion rate. The corrosion rate gradually reached a stable value as the concentration of cupric ions was increased beyond 10 mmol/L.

关键词： aluminum alloys metal corrosion cupric ions ethylene glycol pitting

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A 0.18μm CMOS GAIN-SWITCHED LNA AND MIXER WITH LARGE DYNAMIC RANGE

引用

Journal of Electronics(China) 2008年第5期25卷 679-684页

作者： Yang Jinlin Yang Haigang xue bing The Institute of Electronics Chinese Academy of Sciences Beijing 100190 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China The Institute of Earthquake Science China Earthquake Administration Beijing 100036 China

A 2.4GHz 0.18μm CMOS gain-switched single-end Low Noise Amplifier （LNA） and a passive mixer with no external balun for near-zero-IF （Intermediate Frequency）/RF （Radio Frequency） applications are described. The LNA, fabricated in the 0.18μm 1P6M CMOS technology, adopts a gain-switched technique to increase the linearity and enlarge the dynamic range. The mixer is an IQ-based passive topology. Measurements of the CMOS chip are performed on the FR-4 PCB and the input is matched to 50Ω. Combining LNA and mixer, the front-end measured performances in high gain state are： -15dB of Sll, 18.5dB of voltage gain, 4.6dB of noise figure, 15dBm of IIP3, 85dBm to -10dBm dynamic range. The full circuit drains 6mA from a 1.8V supply.

关键词： CMOS Low Noise Amplifier (LNA) Mixer Front-end Noise figure Gain-switched Dynamic range

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Basal or bolus dose, which is the key factor in CSII?

引用

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第9期7卷 763-765页

作者： YANG Nai-long xue bing LIN Peng Department of Endocrmology the Affiliated Hospital of Medical College. Qingdao university Qingdao 266003 China Department of Endocrinology Shenl＇ang General Hospital Shenyang 110016 China

Objective: To observe the value of HbA1c level evaluating the total daily basal insulin dose by continuous subcuta- neous insulin infusion (CSII) in 268 patients with type 2 diabetes mellitus. Methods: 5-point capillary blood glucose was moni- tored in pre- and post-CSII and the insulin dose which could stabilize blood glucose was defined as the total daily dose of insulin, including basal and bolus total dose. Correlation between HbA1c level and total daily dose of insulin in patients with type 2 dia- betes mellitus was analyzed. Correlation between HbA1c level and 5-point capillary blood glucose was also analyzed. Results: Obvious correlation was observed between HbA1c level and the basal total daily dose of insulin if HbA1c was more than 9.3% (r=0.635, P<0.05). The average of 5-point capillary blood glucose was best correlated with HbA1c and fasting blood glucose next best. Conclusion: HbA1c level can forecast basal total daily dose of insulin in CSII.

关键词： Type 2 diabetes mellitus HbA1C Basal total daily dose of insulin CSII (continuous subcutaneous insulin infusion)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

High-resolution data acquisition technique in broadband seismic observation systems

引用

Science China(Technological Sciences) 2016年第6期59卷 961-972页

作者： GAO Shang Hua xue bing LI Jiang LIN Zhan CHEN Yang ZHU Xiao Yi Key Laboratory of Earthquake Prediction Institute of Earthquake ScienceChina Earthquake Administration

The dynamic range of the currently most widely used 24-bit seismic data acquisition devices is 10–20 d B lower than that of broadband seismometers, and this can affect the completeness of seismic waveform recordings under certain conditions. However, this problem is not easy to solve because of the lack of analog to digital converter(ADC) chips with more than 24 bits in the market. In this paper, we propose a method in which an adder, an integrator, a digital to analog converter chip, a field-programmable gate array, and an existing low-resolution ADC chip are used to build a third-order 16-bit oversampling delta-sigma modulator. This modulator is equipped with a digital decimation filter, thus facilitating higher resolution and larger dynamic range seismic data acquisition. Experimental results show that, within the 0.1–40 Hz frequency range, the circuit board's dynamic range reaches 158.2 d B, its resolution reaches 25.99 bits, and its linearity error is below 2.5 ppm, which is better than what is achieved by the commercial 24-bit ADC chips ADS1281 and CS5371. This demonstrates that the proposed method may alleviate or even completely resolve the amplitude-limitation problem that so commonly occurs with broadband observation instruments during strong earthquakes.

关键词： seismic data acquisition analog to digital conversion (ADC) high resolution dynamic range delta-sigma modulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of cerium salts on corrosion behaviors of Si–Zr hybrid sol–gel coatings

引用

Chinese Journal of Aeronautics 2015年第2期28卷 600-608页

作者： Yu Mei Liu Yuxing Liu Jianhua Li Songmei xue bing Zhang You Yin Xiaolin School of Materials Science and Engineering Beihang University

The present work examines the effects of cerium salts on corrosion behaviors of Si-Zr hybrid sol-gel coatings. The Si-Zr hybrid sol-gel coatings on a 2A l2 aluminum substrate were pre- pared through hydrolysis and condensation of glycidoxypropyl-trimethoxy-silane （GTMS） and zirconium（IV） n-propoxide （TPOZ）. Used as inhibitors for corrosion, three types of cerium salts （Co（NO3）3, CeCl3, and Ce（CH3COO）3） were doped into the sol-gel coatings. Fourier transform infrared （FTIR） and scanning electron microscopy （SEM） were employed to investigate the structures and morphologies of various coatings, and the corrosion resistances of the coatings were evaluated by electrochemical methods and neutral salt spray tests. Experimental results indicate that the addition of cerium salts can hinder the process of corrosion due to their self-healing abili- ties. Furthermore, the sol-gel coating doped with Ce（CH3COO）3 has the best corrosion resistance because of the promotions of hydrolysis and condensation provided by CH3COO-.

关键词： Cerium salts Corrosion resistance Hybrid coating Inhibitor

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Left bundle branch pacing in a ventricular pacing dependent patient with heart failure:A case report

引用

World Journal of Clinical Cases 2022年第20期10卷 7090-7096页

作者： bing-xue Song Xia-Xia Wang Yi An Ying-Ying Zhang Department of Cardiology The Affiliated Hospital of Qingdao UniversityQingdao 266000Shandong ProvinceChina

BACKGROUND Left bundle branch pacing(LBBP)is a physiological pacing method that has emerged in recent *** is an ideal choice for patients with complete left bundle branch block who are in need of cardiac resynchronization therapy(CRT).Moreover,LBBP is superior in maintaining physiological ventricular activation and can effectively improve heart function and quality of life in patients with pacemaker-induced ***,LBBP in pacing-dependent patients who already have cardiac dysfunction has not been well *** SUMMARY A 69-year-old male patient presented with symptoms of chest tightness,palpitation and systolic heart failure with New York Heart Association class III for 1 *** 12-lead electrocardiogram showed atrial fibrillation with third-degree atrioventricular block and ventricular premature *** revealed a right bundle branch block,atrial fibrillation with third-degree atrioventricular block,frequent multifocal ventricular premature beats,Ron-T and ventricular *** echocardiogram documented an enlarged left atrium and left ventricle and a low left ventricular ejection *** angiography indicated a stenosis of 30%in the middle left anterior descending ***,a CRT-D pacemaker was the best choice for this patient according to previous ***,the patient was worried about the financial burden.A single-chamber pacemaker with LBBP was selected,with the plan to take amiodarone and upgrade with dual-chamber implantable cardioverter-defibrillator or CRT-D at an appropriate *** the follow-up at 3 mo after LBBP,the patient showed an improvement in cardiac function with slight improvement in echocardiography parameters,and the New York Heart Association functional class was maintained at ***,the patient no longer suffered from chest tightness and *** showed decreased ventricular arrhythmia of less than 5%.CONCLUSION LBBP might be used in patients with heart failure

关键词： Left bundle branch area pacing Physiological pacing Heart failure Cardiac resynchronization therapy Pacing-dependent Case report

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

An easy route to exotic 9-epimers of 9-amino-(9-deoxy) cinchona alkaloids with(8S,9R) and(8R,9S)-configurations through two inversions of configuration

引用

Chinese Chemical Letters 2014年第4期25卷 557-560页

作者： Jing-Wei Wan xue-bing Ma Rong-Xing He Ming Li College of Chemistry and Chemical Engineering Southwest University

Four exotic chiral organocatalysts, 9-amino-（9-deoxy） cinchona alkaloids with （8S, 9R） and （8R, 9S）- configurations, were conveniently synthesized for the first time in 27-72% total yields through two conversion... 详细信息

关键词： Cinchona alkaloids 9-Amino-(9-deoxy) cinchona alkaloids Synthesis Inversion of configuration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：