检索结果-南通市图书馆

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中外图书馆申请专利分析

现代情报 2015年第3期35卷 97-103页

作者：邵思蜜国家图书馆参考咨询部北京100081

本文对我国及世界图书馆作为专利权人所申请的专利进行了分析和对比。研究发现由于行业特点,各图书馆专利申请量不高,但近年来专利申请量有所提升,我国在国际图书馆专利申请中排名靠前,说明我国图书馆人对知识产权保护意识的加强。另一... 详细信息

本文对我国及世界图书馆作为专利权人所申请的专利进行了分析和对比。研究发现由于行业特点,各图书馆专利申请量不高,但近年来专利申请量有所提升,我国在国际图书馆专利申请中排名靠前,说明我国图书馆人对知识产权保护意识的加强。另一方面,近年来我国申请专利多集中在数字图书馆领域,并多与企业合作申请,世界图书馆申请专利也有类似趋势。由此提出了我国图书馆在专利申请领域应注意的问题和发展方向。

关键词：图书馆图书馆专利专利分析 SIPO Thomson Innovation(TI)

Silicon Melt Liquid Level Detection Based on Improved Laser Trigonometry

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

Silicon Melt Liquid Level Detection Based on Improved Laser ...

Preliminary Assessment of Heavy Metals in Soil along the Vaisigano River in Samoa

第37届中国控制会议

作者： Xinyu Zhang Ding Liu simi Wang Xiaoguo Zhao Lei Jiang National & Local Joint Engineering Research Center of Crystal Growth Equipment and System Integration Xi'an University of Technology Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing

In order to improve the robustness of laser triangulation to detect the liquid level of silicon melt, this paper firstly proposes a method of calculating the laser spot coordinates based on the voting mechanism. The vote is taken according to the coordinates of small laser spots, which are formed by the effect of liquid surface fluctuation on the line laser in the liquid level measurement image. Secondly, the Kalman filter method is used to correct the liquid level measurement data and compensate the missing data. Then the linear conversion is performed to obtain the liquid level value. Finally, the experimental results show that this method can effectively improve the robustness of the liquid level measurement by the laser triangulation method, and avoid the generation of impulse noise. The introduction of the Kalman filter can accurately correct the level measurement data and compensate for missing data.

关键词： Single crystal furnace Liquid level detection Coordinate calculation Voting mechanism Kalman filter

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

Journal of Agricultural Chemistry and Environment 2022年第3期11卷 222-230页

作者： Taema Imo Bernadette Amosa Faainuseiamalie Latu Roya Ieremia Gese Gese Ietitaia simi Faculty of Science National University of Samoa Apia Samoa Department of Science National University of Samoa Apia Samoa

The contamination of heavy metals in various environmental matrices is a major concern to many researchers and requires attention due to their detrimental impacts on the environment and humans as well. This research was carried out to investigate heavy metal levels in soils of some selected sites along the Vaisigano river in Upolu, Samoa. The soil samples were also analysed for physicochemical parameters such as pH, Electrical Conductivity, Moisture Factor, Cation Exchange Capacity (CEC), Organic Carbon, Nitrogen, Phosphorus, and Soil texture. The mean concentrations of heavy metals at the Lelata site were 0.19 ± 0.05 mg/kg (Pb), 0.37 ± 0.45 mg/kg (Mn), 0.15 ± 0.02 mg/kg (Zn) and 0.56 ± 0.42 mg/kg (Cu). The mean concentrations of heavy metals at the Alaoa site were 0.13 ± 0.03 mg/kg (Pb), 0.42 ± 0.51 mg/kg (Mn), 0.16 ± 0.03 mg/kg (Zn) and 0.45 ± 0.43 mg/kg (Cu). The heavy metal concentrations from both sites were lower than the permissible levels given by the World Health Organization (WHO). The Geo-accumulation pollution index (I(geo)) of heavy metals in the Lelata site was Cu > Mn > Pb > Zn and from the Alaoa site was Cu > Pb > Zn > Mn.

关键词： Toxicology Land-Use Agriculture Pollution Index Samoa

Breeding and application of Jiafuzhan,a new elite early indica rice cultivar in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Biology 2007年第2期2卷 144-150页

作者： WANG Houcong HUANG Huakang QIU simi ZHANG Shi FANG Yashun CAI Jinlei ZHENG Xuan HUANG Yumin CHEN Ruming SUN Chuanzhi CHEN Shuanglong CHI Xiaowen LIAO Xinying ZHANG Weiqing ZHONG Xinbin School of Life Sciences Xiamen UniversityXiamen 361005China Fujian Seed Station Fuzhou 350001China Xiamen Seed Management Station Xiamen 361012China Xiamen Agriculture Technology Extension Center Xiamen 361003China

After 20 years of dedicated research,Jiafuzhan has been successfully developed under the new technologies in breeding high-quality early indica rice *** rice quality has almost reached the A-level Editable Rice of Agriculture Department of China,and its average production reaches 400-500 kg/(666.7 m^(2)).This new cultivar also has other characteristics such as enhanced resistance of blast and fallen,steady productivity,and strong *** has been put into production of over 11.4×10^(4)hm^(2)in Fujian Province and has been introduced and extended in other Provinces like Jiangxi,Guangdong,and Guangxi,*** successes of breeding Jiafuzhan is a solution to the existing perennial problems in the rice industry,such as poor grain quality of big-grain rice and early indica rice,low productivity,and poor blast resistance of elite rice.

关键词： Jiafuzhan early indica rice high quality

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

健康老年人补充维生素E和体内免疫反应

美国医学会杂志（中文版） 1997年第6期16卷 296-303页

作者： simi.,NM

High chromosomal evolutionary dynamics in sleeper gobies(Eleotridae)and notes on disruptive biological factors in Gobiiformes karyotypes(Osteichthyes,Teleostei)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Marine Life Science & Technology 2021年第3期3卷 293-302页

作者： simião Alefe Soares da Silva Paulo Augusto de Lima-Filho Clóvis Coutinho da Motta-Neto Gideão Wagner Werneck Félix da Costa Marcelo de Bello Cioffi Luiz Antônio Carlos Bertollo Wagner Franco Molina Departamento de Biologia Celular e Genética Centro de BiociênciasUniversidade Federal do Rio Grande do NorteNatalRN59.078-970Brazil Instituto Federal de Ciência e Tecnologia do Rio Grande do Norte Santa CruzRN59200-000Brazil Departamento de Genética e Evolução Universidade Federal de São CarlosRodovia Washington LuísKm 235São CarlosSP13.565-905Brazil

The order Gobiiformes is made up of more than 2200 species,representing one of the most diverse groups among teleost *** biological causes for the tachytelic karyotype evolution of the gobies have not yet been fully *** we expanded cytogenetic data for the Eleotridae family,analyzing the neotropical species Dormitator maculatus,Eleotris pisonis,Erotelis smaragdus,and Guavina *** addition,a meta-analytical approach was followed for elucidating the karyotype diversification versus biological aspects(habitat and egg type)of the *** species *** and *** present 2n=46 acrocentric chromosomes(NF=46),*** 2n=46(36sm+4st+6a;NF=86),and ***,the most divergent karyotype,with 2n=52 acrocentric chromosomes(NF=52).Besides numeric and structural diversification in the karyotypes,the mapping of rDNAs and microsatellites also showed noticeable numerical and positional variation,supporting the high chromosomal evolutionary dynamism of these *** Gobiiformes,karyotype patterns which are more divergent from the basal karyotype(2n=46a)are associated with characteristics less effective to dispersion,such as the benthic *** adaptive characteristics,connected with the organization of the repetitive DNA content in the chromosomes,likely play a synergistic role in the remarkable karyotype diversification of this group.

关键词： Chromosome evolution Dispersive potential Goby Karyotype diversification Microsatellites rDNA

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

柴油机水下排气红外抑制仿真及试验研究

中国舰船研究 2019年第4期14卷 98-103页

作者：唐斯密李铣镔海军研究院

[目的]为降低通气管航态下的潜艇红外尾迹,[方法]针对柴油机水下排气系统,提出一种能够抑制水下高温废气红外辐射的两级冷却方法,然后基于有限元流体分析方法分析红外抑制前、后的水面温度场。最后,基于仿真得到的初步数据搭建水下排气... 详细信息

[目的]为降低通气管航态下的潜艇红外尾迹,[方法]针对柴油机水下排气系统,提出一种能够抑制水下高温废气红外辐射的两级冷却方法,然后基于有限元流体分析方法分析红外抑制前、后的水面温度场。最后,基于仿真得到的初步数据搭建水下排气试验平台,并对红外抑制前、后的水面红外辐射亮度及水下温度进行测试。[结果]结果表明:两级降温措施对柴油机的高温排气有着良好的红外抑制效果,水面最大红外亮度可降低约90%。[结论]该方法对潜艇的隐蔽性改进具有较好的工程应用价值和军事价值。

关键词：柴油机水下排气红外抑制试验

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

中国县域人口收缩空间格局与影响因素

经济地理 2023年第7期43卷 42-51,98页

作者：张旭亮周思敏浙江大学民营经济研究中心中国浙江杭州310000 浙江大学区域协调发展研究中心中国浙江杭州310000 浙江工业大学经济学院中国浙江杭州310000

近年来,我国人口出生率持续降低,人口红利期接近尾声,人口收缩现象在县域尺度上日趋明显。文章以“六普”“七普”数据为支撑,通过常住人口、劳动年龄人口等指标构建测度指数对我国县域的人口收缩状况进行考察,分析人口收缩的空间格局,... 详细信息

近年来,我国人口出生率持续降低,人口红利期接近尾声,人口收缩现象在县域尺度上日趋明显。文章以“六普”“七普”数据为支撑,通过常住人口、劳动年龄人口等指标构建测度指数对我国县域的人口收缩状况进行考察,分析人口收缩的空间格局,并结合空间杜宾模型分析影响收缩的相关因素。结果表明:①2010—2020年,常住人口收缩县域占比约53%,超70%的县域出现劳动年龄人口不同程度的减少,超96%的县域劳动年龄人口增长率少于常住人口增长率。②从空间视角来看,东北三省、山西等是我国常住人口收缩县域集中分布的地区,保持人口增长的县域主要集中在浙江、西藏、新疆等地。天津、北京、上海、江苏等为代表的一些东部发达地区同样面临劳动年龄人口收缩问题。③影响我国县域人口收缩的因素非常复杂,经济发展水平、产业结构、出生率、地理位置、教育水平与行政等级都显著影响了县域人口收缩。

关键词：人口收缩人口流失常住人口劳动年龄人口县域单元空间格局空间杜宾模型

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

怎样确定甲状腺肿

美国医学会杂志（中文版） 1996年第3期15卷 164-168页

作者： simi.,K 郭伟