检索结果-南通市图书馆

Biomass and net primary productivity of mangrove communities along the Oligohaline zone of Sundarbans, Bangladesh

Forest Ecosystems 2017年第4期4卷 264-272页

作者： Md. Kamruzzaman Shamim Ahmed akira osawa Laboratory of Ecosystem Production and Dynamics Graduate School of Global Environmental Studies Kyoto University Kyoto 606-8501 Japan Forestry and Wood Technology Discipline Khulna University Khulna 9208 Bangladesh

Background： The article presents the first estimates of biomass and productivity for mangrove forests along the Oligohaline zone of the Sundarbans Reserve Forest （SRF）, Bangladesh. This study was conducted overone year from March 2016 to April 20] 7. Stand structure, above and below-ground biomass changes, and litterfall production were measured within a 2100 m2 sample plot. Methods： All trees in the study plots were numbered and height （H） and diameter at breast height （DBH） were measured. Tree height （H） and DBH for each tree were measured in March 2016 and 2017. We apply the above and belowground biomass equation for estimating the biomass of the mangrove tree species （Chave et al. Oecologia 145：87-99, 2005; Komiyama et al. J Trop Ecol 21：471-477, 2005）. Litterfall was collected using 1-mm mesh litter traps with collection area of 0.42 m2. Net Primary Production （NPP） was estimated by the summation method of Ogawa Primary productivity of Japanese forests： productivity of terrestrial communities, JIBP synthesis （1977） and Matsuura and Kajimoto Carbon dynamics of terrestrial ecosystem： Systems approach to global environment （2013）. Results： Heritiero fomes has maintained its dominance of the stand and also suffered the highest tree mortality （2.4%） in the suppressed crown class. The total above-ground biomass （AGB） and below-ground biomass （BGB） of the studied stand was ]54.8 and 84.2 ***-1, respectively. Among the total biomass of the trees, 64.8% was allocated to AGB and 35.2% to BGB. In case of species-wise contribution of biomass allocation, Avicennia officinalis showed the highest score and Aglaia cucullota the lowest. Mean annual total litterfall was 10.1 Mg-ha ***-1, with the maximum litterfall in winter or dry season and late summer or rainy season. The mean AGB increment and above-ground net primary productivity （AGNPP） were 7.1 and 17.2 ***-1, respectively. Total net primary productivity （NPP） was estimated to be 21.0 *** Lyr-1 over the observ

关键词： Primary production Litterfall Monthly pattern Biomass carbon Species wise contribution Sundarbans

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

Land use patterns and tree species diversity in the Volta Geological Unit, Togo

引用

Journal of Mountain Science 2019年第8期16卷 1869-1882页

作者： FOLEGA Fousseni ATAKPAMA Wouyo WALA Kperkouma MUKETE Beckline SHOZO Shibata akira osawa ZHAO Xiu-hai AKPAGANA Koffi Geomatic and Ecosystems Modeling/Laboratory of botany and Plant Ecology Faculty of SciencesUniversity of LomeLome01BP1515Togo Key Laboratory for Forest Resources&Ecosystem Processes Beijing Forestry UniversityBeijing 100083China Graduate School of Global Environmental Studies Kyoto UniversityKyoto 606-8501Japan Department of Forest Management Beijing Forestry UniversityBeijing 100083China

The application of remote sensing in understanding tree species structural diversity and land use patterns relationship is imperative for reforestation and biodiversity conservation efforts. This study assesses land use patterns and tree species structural diversity in previously reforested hilly sandstone regions of northern Togo. The physical height, and diameter at breast height(DBH) more than 5 cm of all tree species in each given plot were measured in summer 2017. A total of 75 plots of 900 m^2 installed along the toposequence were recorded. In addition, a semi-supervised classification of Landsat 8 images in January of 2018, was also used to classify the land use patterns. 36 tree species and 19 families were recorded for the entire study area. Meanwhile, 19 tree species and 15 families were recorded for the previously afforested zones. The most abundant species included the Sterculiaceae, Zygophyllaceae, Meliaceae, and Mimosaceae. The trees stand structure represented 8.61 ± 0.57 m, 11.28 ± 1.76 cm, and 0.018 ± 0.009 m^2 per hectare for height, diameter and basal area respectively. Major land use patterns were tree and shrub savannahs, parklands and croplands which represented over 60% of the landscape. It is necessary to examine the regeneration and vegetative multiplication potentials of the most frequent and abundant tree species for any eventual future afforestation programs in these hilly sandstone regions of northern Togo.

关键词： Ecological diversity Land use Ecological restoration Forest degradation Togo

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 regression model-based method for indoor positioning with compound location fingerprints

引用

Geo-Spatial Information Science 2019年第2期22卷 107-113,I0003页

作者： Tomofumi Takayama Takeshi Umezawa Nobuyoshi Komuro Noritaka osawa Hewlett-Packard Japan LtdTokyoJapan Graduate School of Engineering Chiba UniversityChibaJapan

This paper proposed and evaluated an estimation method for indoor *** method combines location fingerprinting and dead reckoning differently from the conventional *** uses compound location fingerprints,which are composed of radio fingerprints at multiple points of time,that is,at multiple positions,and displacements between them estimated by dead *** avoid errors accumulated from dead reckoning,the method uses short-range dead *** method was evaluated using 16 Bluetooth beacons installed in a student room with the dimensions of 11×5 m with furniture *** Received Signal Strength Indicator(RSSI)values of the beacons were collected at 30 measuring points,which were points at the intersections on a 1×1 m grid with no obstacles.A compound location fingerprint is composed of RSSI vectors at two points and a displacement vector between *** Forests(RF)was used to build regression models to estimate positions from location *** root mean square error of position estimation was 0.87 m using 16 Bluetooth *** error is lower than that received with a single-point baseline model,where a feature vector is composed of only RSSI values at one *** results suggest that the proposed method is effective for indoor positioning.

关键词： Indoor positioning integrated estimation radio fingerprinting dead reckoning machine learning non-linear regression

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

Internal frontier:The pathophysiology of the small intestine

引用

World Journal of Gastroenterology 2013年第2期19卷 161-164页

作者： Haruhiko Sugimura Satoshi osawa Department of Tumor Pathology Hamamatsu University School of Medicine1-20-1 HandayamaHigashi-kuHamamatsu 431-3192Japan Endoscopic and Photodynamic Medicine Hamamatsu University School of Medicine1-20-1 HandayamaHigashi-kuHamamatsu 431-3192Japan

Even though the small intestine occupies a major portion of the abdominal space and is essential for life,in most pathology textbooks any chapter on small intestinal diseases,especially in human beings,is typically shorter than those for other gastrointestinal *** and experimental investigations of the small intestine in various clinical situations,such as nutrition management,obesity interventions,and emergency care,have elucidated several important biological problems associated with the small intestine,the last frontier of *** this issue,a review by Professor Basson and his team at Michigan State University sheds light on the changes in the human small intestine under various conditions based on their clinical and surgical *** the advent of recent innovations in enteroscopy,a form of endoscopy used to examine deep within the small intestine,the issue that they highlighted,i.e.,mucosal adaptation and atrophy of the human small intestine,has emerged as a major and manageable challenge for gastroenterologists in general,including the readers of the World Journal of Gastroenterology.

关键词： Ileum Jejunum Small intestine Atrophy Adaptation Enteroscopy

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

Fitness costs of reflex bleeding in the ladybird beetle Harmonia axyridis: the role of parental effects

引用

Insect Science 2020年第6期27卷 1346-1359页

作者： Mohamed H.Bayoumy Naoya osawa Severin Hatt Faculty of Agriculture Economic Entomology DepartmentMansoura UniversityMansouraEgypt Laboratory of Forest Ecology Graduate School of AgricultureKyoto UniversityKyotoJapan

Reflex bleeding is an important antipredator defense mechanism in *** examined the costs of reflex bleeding in larval and adult stages of the ladybird beetle Harmonia axyridis on offspring fitness and reproductive performance through the comparisons between bled and control larvae,reciprocal crosses of bled/control beetles,and early and late clutch *** bled during their larval stage spent a longer time in development and weighed less than *** fertility was reduced for crosses where either one or both parents had been bled during the larval or adult *** crosses that included a parent bled during the larval stage suffered fitness costs in development and female body mass,while those bled during the adult stage suffered no transgenerational *** that suffered bleeding during their larval stage accelerated progeny development of nonbled females in early clutches,suggesting a positive transgenerational effect of larval bleeding,while males that did not suffer bleeding accelerated progeny development of bled females in later *** the underlying effects of bleeding on females'offspring in the early clutches were diminished in the late ones,suggesting another transgenerational *** strengths of maternal and paternal effects on progeny development of parents bled at the larval stage were higher in earlier *** study suggests that *** adults are less affected than larvae by the frequent use of the defensive secretions in their stressful habitats.

关键词： alkaloids development intraguild predation maternal reproduction mating transgenerational effects

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

Effect of digital elevation models on monitoring slope displacements in open-pit mine by differential interferometry synthetic aperture radar

引用

Journal of Rock Mechanics and Geotechnical Engineering 2020年第5期12卷 1001-1013页

作者： I Nyoman Sudi Parwata Shinichiro Nakashima Norikazu Shimizu Takahiro osawa Graduate School of Science and Engineering Yamaguchi UniversityTokiwadaiUbe755-8611Japan Centre for Research and Application of Satellite Remote Sensing Yamaguchi UniversityTokiwadaiUbe755-8611Japan Regional Satellite Applications Center for Disaster Management(RSCD) Satellite Applications and Operations Center(SAOC)Space Technology DirectorateJapan Aerospace Exploration Agency(JAXA)Industrial Technology InstituteAsutopiaUbe755-0195Japan Centre for Remote Sensing and Ocean Sciences(CreSOS) Udayana UniversityDenpasarBali80232Indonesia

Displacement monitoring in open-pit mines is one of the important tasks for safe management of mining *** interferometric synthetic aperture radar(DInSAR),mounted on an artificial satellite,has the potential to be a cost-effective method for monitoring surface displacements over extensive areas,such as open-pit *** requires the ground surface elevation data in the process of its analysis as a digital elevation model(DEM).However,since the topography of the ground surface in open-pit mines changes largely due to excavations,measurement errors can occur due to insufficient information on the elevation of mining *** this paper,effect of different elevation models on the accuracy of the displacement monitoring results by DInSAR is investigated at a limestone *** addition,validity of the DInSAR results using an appropriate DEM is examined by comparing them with the results obtained by global positioning system(GPS)monitoring conducted for three years at the same limestone *** is found that the uncertainty of DEMs induces large errors in the displacement monitoring results if the baseline length of the satellites between the master and the slave data is longer than a few hundred *** the monitoring results of DInSAR and GPS,the root mean square error(RMSE)of the discrepancy between the two sets of results is less than 10 mm if an appropriate DEM,considering the excavation processes,is *** is proven that DInSAR can be applied for monitoring the displacements of mine slopes with centimeter-level accuracy.

关键词： Open-pit mine Slope monitoring Digital elevation model(DEM) Interferometric synthetic aperture radar (InSAR) Differential interferometric synthetic aperture radar(DInSAR)

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

Relative importance of biological and human-associated factors for alien plant invasions in Hokkaido, Japan

引用

Journal of Plant Ecology 2019年第4期12卷 673-681页

作者： Chika Egawa Takeshi osawa Tomoko Nishida Yasuto Furukawa Institute for Agro-Environmental Sciences National Agriculture and Food Research Organization3-1-3 KannondaiTsukubaIbaraki 305-8604Japan Faculty of Urban Environmental Sciences Tokyo Metropolitan University1-1 Minami-OsawaHachiojiTokyo 192-0397Japan Headquarters National Agriculture and Food Research Organization3-1-1 KannondaiTsukubaIbaraki 305-4517Japan Rakuno Gakuen University 582 Bunkyodai-MidorimachiEbetsuHokkaido 069-8501Japan

Aims The invasion success of alien plants is strongly affected by both biological and human-associated *** of the rela-tive contribution of each factor is important not only for the further understanding of invasion processes but also for the better manage-ment of invasion risk,particularly in protected areas of high con-servation ***,we quantified the relative importance of species biological traits and association with a human activity,***,in explaining the invasion success of alien plants across the entire region and in protected areas in Hokkaido,*** As a quantitative measure of invasion success,the distribution ex-tent of naturalized populations across the entire prefecture and in protected areas was calculated for 63 alien species with equal residence time based on species occurrence records at a spatial resolution of 5-km mesh grid *** each species,we identi-fied seven biological traits(seed mass,dispersal mode,maximum plant height,capability of vegetative reproduction,flowering start time and period and life span)and two human-associated factors(introduction purpose and cultivation frequency for agricultural use).Cultivation frequency was determined based on the frequency of seed-sowing in pastures:(1)not sown,(2)accidentally sown as a seed contaminant and(3)intentionally sown for commercial *** importance of biological traits and human-associated factors in explaining the distribution extent was determined using an information-theoretic *** Findings In explaining the distribution extent across the entire prefecture,species biological traits and human-associated factors showed comparable importance;cultivation frequency exhibited the high-est importance value closely followed by seed mass,maximum height and flowering *** contrast,when focusing on pro-tected areas,human association was more important than bio-logical traits,as indicated by the greatest importance of cultiva

关键词： agricultural use biological invasion distribution nature reserve pasture plants

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

Ghrelin and Helicobacter pylori infection

引用

World Journal of Gastroenterology 2008年第41期14卷 6327-6333页

作者： Hiroyuki osawa Department of Internal Medicine Division of Gastroenterology Jichi Medical University

Ghrelin is primarily secreted from the stomach and has been implicated in the coordination of eating behavior and weight regulation. Ghrelin also plays an essential role in the mechanism of gastric mucosal defense. Thus, it is important to clarify which diseases primar- ily influence changes in plasma ghrelin concentrations. Helicobacter pylori （H pylor/~ infection is involved in the pathogenesis of gastritis, gastric and duodenal ulcer, gastric carcinoma, and mucosa-associated lym- phoid tissue lymphoma. H pylori eradication is related to body weight change. Compared, H pylori infected and negative subjects with normal body mass index, plasma ghrelin concentration, gastric ghrelin mRNA, and the number of ghrelin producing cells in gastric mucosa are significantly lower in Hpylori infected sub- jects than in Hpylori-negative controls. Plasma ghrelin concentration decreases with the progression of gastric atrophy. Impaired gastric ghrelin production in associa- tion with atrophic gastritis induced by Hpylori infection accounts for the decrease in plasma ghrelin concentra- tion. However, the ratio of plasma acylated ghrelin to total ghrelin levels is higher in patients with chronic atrophic gastritis than in healthy subjects. This may re- sult from the＇ compensatory increase in plasma active ghrelin concentration in response to gastric atrophy. After H pylori eradication, gastric preproghrelin mRNA expression is increased nearly 4-fold in most cases. However, changes in plasma ghrelin concentrations be- fore and after Hpylori cure are not associated with the gastric ghrelin production. Plasma ghrelin changes are inversely correlated with both body weight change and initial plasma ghrelin levels.

关键词： Ghrelin Helicobacter pylori Eradication Body weight Leptin

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

Fabrication,nanostructures and electronic properties of nanodiamond-based solar cells

引用

Progress in Natural Science:Materials International 2010年第1期20卷 38-43页

作者： Akihiko NAGATA Takeo OKU Kenji KIKUCHI Atsushi SUZUKI Yasuhiro YAMASAKI Eiji osawa Department of Materials Science The University of Shiga Prefecture Orient Chemical industries Co.Ltd. Department of New Business8-1 Sanra-Higashi-MachiNeyagawaOsaka572-8581Japan 3. NanoCarbon Research Institute Ltd.3-15-1 TokidaUedaNagano386-8567Japan

Nanodiamond-based solar cells were fabricated and the photovoltaic properties were ***(C60)and fullerenol(C60(OH)10-12)were used as n-type semiconductors,and diamond nanoparticles and metal phthalocyanine derivative were used as p-type *** nanostructures of the solar cells were investigated by transmission electron microscopy and X-ray diffracometry,and the electronic property was discussed.

关键词： solar cell nanodiamond C60 phthalocyanine

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Design and Construction of a Low-Force Stylus Probe for On-machlne Tool Cutting Edge Measurement

引用

Nanomanufacturing and Metrology 2020年第4期3卷 282-291页

作者： Hiraku Matsukuma Bo Wen Shinichi osawa Sho Sekine Yuki Shimizu Wei Gao Department of Finemechanics Graduate School of EngineeringTohoku UniversitySendaiJapan

A new on-machine profiler employing a cantilever beam was proposed and developed to measure the sharp micro-cutting edges of precision cutting tools with low measuring force of 0.1 *** proposed profiler consists of a probe unit and a positioning *** probe unit employs a stylus mounted on the free end of a hollow triangular cantilever beam and a laser displacement sensor to detect the detlection of the cantilever *** positioning unit consists of two single-axis DC servo motor stages for precise positioning of the probe *** cantilever is designed with the assistance of the finite element *** order to demonstrate the feasibility of the proposed measurement system,experiments are conducted and the measurement result for a micro-cutting edge is compared with that by a commercial ***,a method to com-pensate for the measurement error caused by the lateral displacement of the cantilever beam is *** compensated measurement results show good agreement within±2μm with those obtained by the commercial profler.

关键词： On-machine measurement Surface profiler Micro-cutting edge Low-force measurement Cantilever beam

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

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：