检索结果-南通市图书馆

Fraying around the edges:negative effects of the invasive Tradescantia zebrina *** Bosse(Commelinaceae)on tree regeneration in the Atlantic Forest under different competitive and environmental conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2019年第4期12卷 713-721页

作者： Wagner a.chiba de Castro Rafael O.Xavier Federico H.L.Garrido Jair H.C.Romero Cleto K.Peres Ruberval Cda Luz Instituto Latino-Americano de Ciências da Vida e da Natureza Universidade Federal da Integração Latino-Americana(UNILA)Foz do IguaçuPR85867-970Brazil Departmento de Ecologia Universidade de São PauloSão PauloSP05508-090Brazil Departamento de Hidrobiologia Universidade Federal de São CarlosSão CarlosSP13565-905Brazil

Aims Invasive plants modify the structure and functioning of natural en-vironments and threat native plant *** species are often favored by human interference such as the creation of arti-ficial forest *** removal experiments may clarify if invasive plants are detrimental to native plant regeneration and how this is related to other local *** assessed the joint effect of envir-onment and competition with the invasive Tradescantia zebrina on tree species recruitment in an Atlantic Forest *** We carried out the experimental study in the Iguaçu National Park,located in southern Brazil,using 30 plots distributed across five invaded sites during 6 *** counted *** leaves and recorded the abundance and height of tree recruits over time under contrasting environmental(forest edge *** interior)and removal(all aboveground biomass,only *** removal,and control)*** analyzed the effects of environment and re-moval treatment using generalized linear mixed *** Findings The invasive species performed better at the forest edge than in the *** higher competitive pressure of *** led to higher mortality and lower height of tree *** removal favored tree recruitment,especially in the forest *** study shows that *** hampers woody species regeneration in tropical Atlantic Forests,especially at the forest edge.

关键词： plant invasion competition forest edge plant recruitment Tradescantia zebrina inch plant removal treatment

Ductilization of Ni_3Al by Alloying with Substitutional Elements

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 Materials Science & Technology 1993年第6期9卷 391-399页

作者： Department of Metallurgy,Faculty of Engineering,Iwate University,Morioka 020,Japan a.chiba S.Hanada Institute for Materials Research,Tohoku University,Sendai 980,Japan

This paper reviews recent research on ductility improvement of B-undoped Ni_3Al ***_3Al binary alloys with hypostoichiometric compositions show appreciable ductility at room temperature when the samples are prepared by recrystallization annealing after cold pressing,although the alloys with stoichiometric and hyperstoichiometric compositions remain ***-spun ribbons with hypostoichiometric compositions contain fine anti-phase domains (APDs),while no APD can be seen in melt-spun ribbons with a hyperstoichiometric *** ductility in hypostoichiometric Ni_3Al alloys is associated with low ordering energy of the *** addition of ternary elements,which have been classified as γ formers such as Pd,Pt,Cu,Co and *** ductility of Ni_3Al ***,the microstructure of the melt-spun ribbons consists of fine *** addition of γ' formers such as Si,Ti,Zr,V,Nb and Ta leads to brittle intergranular frac- *** APD was observed in the melt-spun ribbons of these ternary alloys.

关键词： ductility Ni_3Al substitutional element

Efficient and stable hybrid perovskite-organic light-emitting diodes with external quantum efficiency exceeding 40 per cent

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第7期13卷 1364-1371页

作者： Lingmei Kong Yun Luo Qianqian Wu Xiangtian Xiao Yuanzhi Wang Guo Chen Jianhua Zhang Kai Wang Wallace CHChoy Yong-Biao Zhao Hongbo Li Takayuki chiba Junji Kido Xuyong Yang Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghai 200072China. Institute of Nanoscience and Applications Department of Electrical and Electronic EngineeringSouthern University of Science and TechnologyShenzhen 518055China. Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina. Department of Physics and Lakeside AR/VR Laboratory International Joint Research Center for Optoelectronic and Engineering ResearchYunnan UniversityKunming 650091China. Experimental Center of Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China. Graduate School of Organic Materials Science Frontier Center for Organic MaterialsYamagata University4-3-16 JonanYonezawa 992–8510Japan

Light-emitting diodes(LEDs)based on perovskite semiconductor materials with tunable emission wavelength in visible light range as well as narrow linewidth are potential competitors among current light-emitting display technologies,but still suffer from severe instability driven by electric ***,we develop a stable,efficient and highcolor purity hybrid LED with a tandem structure by combining the perovskite LED and the commercial organic LED technologies to accelerate the practical application of *** LED and organic LED with close photoluminescence peak are selected to maximize photon emission without photon reabsorption and to achieve the narrowed emission *** designing an efficient interconnecting layer with p-type interface doping that provides good opto-electric coupling and reduces Joule heating,the resulting green emitting hybrid LED shows a narrow linewidth of around 30 nm,a peak luminance of over 176,000 cd m^(−2),a maximum external quantum efficiency of over 40%,and an operational half-lifetime of over 42,000 h.

关键词： diodes narrow quantum

A preliminary study on rectal dose reduction associated with hyaluronic acid implantation in brachytherapy for prostate cancer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Urology 2024年第2期11卷 286-293页

作者： Tairo Kashihara Yuka Urago Hiroyuki Okamoto Mihiro Takemori Hiroki Nakayama Shohei Mikasa Tetsu Nakaichi Kotaro Iijima Takahito chiba Junichi Kuwahara Satoshi Nakamura Weishan Chang Yoshiyuki Matsui Hiroshi Igaki Department of Radiation Oncology National Cancer Center Hospital5-1-1 TsukijiChuo-kuTokyoJapan Radiation Safety and Quality Assurance Division National Cancer Center Hospital5-1-1 TsukijiChuo-kuTokyoJapan Department of Radiological Sciences Graduate School of Human Health SciencesTokyo Metropolitan University7-2-10 Higashi-OguArakawa-kuTokyoJapan Department of Radiological Technology National Cancer Center Hospital5-1-1 TsukijiChuo-kuTokyoJapan Department of Urological Oncology National Cancer Center Hospital5-1-1 TsukijiChuo-kuTokyoJapan

Objectives: Hydrogel spacer (HS) was developed to reduce rectal toxicities caused by radiotherapy, but has been reported to cause major adverse events. Our institute has attempted to introduce a hyaluronic acid (HA) as an alternative spacer. This study aimed to compare rectal doses and geometric distributions between the HS and HA implantation in prostate ***: HS and HA were inserted in 20 and 18 patients undergoing high-dose brachytherapy, respectively. The rectum spacer volumes injected were 10 mL and 22 mL, respectively. In the treatment planning system, 13.5 Gy was administered with common catheter positions. The rectal dose indices were assessed between the spacer groups for dosimetry evaluation. Distances between the prostate and rectum and configurations of the spacers were ***: The mean doses irradiated to 0.1 and 2 mL of the rectum were 10.45 Gy and 6.71 Gy for HS, and 6.73 Gy and 4.90 Gy for HA (p<0.001). The mean minimum distances between the prostate and rectum were 1.23 cm and 1.79 cm for HS and HA, respectively (p<0.05). Geometrical configuration comparisons revealed that HA has a higher ability to expand the space than ***: The rectal dose reduction ability of HA is significantly greater than that of HS, suggesting its potential as a new spacer.

关键词： Brachytherapy Hyaluronicacid Hydrogel Prostaticneoplasm Radiotherapy

Accuracy and Utility of Vessel Analysis Using Non-Contrast CT for Planning Endovascular Aortic Repair

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Medical Imaging 2024年第3期14卷 96-105页

作者： Midori Komita-Moriya Yukihisa Ogawa Akiyuki Kotoku Shintaro Nawata Kenji Kuramochi Yasuyoshi Ogawa Kiyoshi chiba Hiroshi Nishimaki Hidefumi Mimura Department of Radiology St. Marianna University School of Medicine Kanagawa Japan Department of Radiology Tokai University School of Medicine Hachioji Hospital Tokyo Japan Radiological Technology St. Marianna University School of Medicine Kanagawa Japan Department of Cardiovascular Surgery St. Marianna University School of Medicine Kanagawa Japan

Objectives: This study aimed to determine whether errors in vascular measurements would affect device selection in endovascular aortic repair (EVAR) by comparing measurements obtained using non-contrast computed tomography (NCT) with those obtained using contrast-enhanced CT (CECT). Materials and Methods: This single-center, retrospective study included 25 patients who underwent EVAR for abdominal aortic aneurysm at our institution. A 1-mm horizontal cross-sectional slice of NCT and CECT from each patient was retrospectively reviewed. The area from the abdominal aorta to the common iliac artery was divided into four zones. A centerline was created using the NCT by manually plotting the center points. Subsequently, the centerlines were automatically extracted and manually corrected during the arterial phase of CECT. The diameter and length of each zone were measured for each modality. The mean diameters and lengths of the target vessels were compared between NCT and CECT. Results: The measurements obtained using both methods were reproducible and demonstrated good agreement. The mean differences in vessel length and diameter measurements for each segment between NCT and CECT were not statistically significant, indicating good consistency. Conclusion: NCT may be useful for preoperative EVAR evaluation in patients with renal dysfunction or allergies to contrast agents.

关键词： Non-Contrast CT Vessel Analysis EVAR Contrast-Enhanced CT Abdominal Aortic Aneurysm

gem-Difluorinative 1,2-azide migration of vinyl azides enables an expedient synthesis of β-difluoroalkyl azides

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2020年第8期63卷 1019-1020页

作者： Jia Hao Pang Shunsuke chiba Division of Chemistry and Biological Chemistry School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore

Organic azides have shown versatile reactivity to induce various organic transformations for the synthesis of nitrogencontaining organic molecules such as 1,3-dipolar cycloadditions with unsaturated bonds,the Curtius rearrangement,and formation of nitrogen-centered radicals,most of which are driven by the entropic loss of molecular dinitrogen[1].

关键词： azide synthesis enable

Direct measurement of the three-dimensional distribution of leaf area density and light conditions in a mature oak stand by the cube method

在线全文

学校读者我要写书评

暂无评论

林业研究:英文版 2023年第6期34卷 1817-1827页

作者： Chiharu Migita Yukihiro chiba Tanaka Kenzo Forestry and Forest Products Research Institute TsukubaIbaraki 305-8687Japan Japan International Research Centre for Agricultural Sciences TsukubaIbaraki 305-8686Japan

Although the distributions of foliage and light play major roles in various forest functions,accurate,nondestructive measurement of these distributions is difficult due to the complexity of the canopy *** evaluate the foliage and light distributions directly and nondestructively in a mature oak stand,we used the cube method by dividing the forest canopy into small cubes(50 cm per side)and directly measured leaf area density(LAD,the total one-sided leaf area per unit volume,i.e.,cube)and relative irradiance(RI)within each *** distribution of LAD and of RI was highly heterogeneous,even at the same canopy *** heterogeneity reflected the presence of foliage clusters associated with multiple forking *** relationship between cumulative LAD at the canopy surface and average RI followed the Beer-Lambert *** mean light extinction coefficient(K)was ***,K was overestimated by more than double(0.80)when calculated based on the classical method using RI at the forest *** overestimation was caused by the lower RI due to light absorption by nonleaf plant parts below the *** findings on the complex foliage and light distributions in canopy layers should help improve the accuracy of RI and K measurements and thus more accurate predictions of environmental responses and forest functions.

关键词： Beer-Lambert law Canopy structure Foliage cluster Leaf area density Leaf area index Relative light intensity

Visual Person Identification Using a Distance-dependent Appearance Model for a Person Following Robot

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2013年第5期10卷 438-446页

作者： Junji Satake Masaya.chiba Jun Miura Department of Computer Science and Engineering Toyohashi University of Technology

This paper describes a person identifcation method for a mobile robot which performs specifc person following under dynamic complicated environments like a school canteen where many persons *** propose a distance-dependent appearance model which is based on scale-invariant feature transform（SIFT） *** is a powerful image feature that is invariant to scale and rotation in the image plane and also robust to changes of lighting ***,the feature is weak against afne transformations and the identifcation power will thus be degraded when the pose of a person changes *** therefore use a set of images taken from various directions to cope with pose ***,the number of SIFT feature matches between the model and an input image will decrease as the person becomes farther away from the ***,we also use a distance-dependent *** person following experiment was conducted using an actual mobile robot,and the quality assessment of person identifcation was performed.

关键词： Mobile robots image processing intelligent systems identifcation scale-invariant feature transform(SIFT)feature

Isothermal γ →ε phase transformation behavior in a Co-Cr-Mo alloy depending on thermal history during electron beam powder-bed additive manufacturing

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第15期47卷 162-170页

作者： Yufan Zhao Yuichiro Koizumi Kenta Aoyagi Kenta Yamanaka Akihiko chiba Department of Materials Processing Graduate School of EngineeringTohoku UniversityAoba-yama 02Aoba-kuSendai980-8579Japan Institute for Materials Research Tohoku University2-1-J KatahiraAoba-kuSendai980-8577Japan

Powder bed fusion with electron beam(PBF-EB),allows Co-Cr-Mo(CCM) implants with patientcustomization to be fabricated with high quality and complex ***,the variability in the properties of PBF-EB-built CCM alloy,mainly due to the lack of understanding of the mechanisms that govern microstructural heterogeneity,brings limitations in extensive *** this study,the microstructural heterogeneity regarding the γ-fcc→ε-hcp phase transformation was *** phase transformation during PBF-EB was analyzed depending on the thermal history that was elucidated by the numerical *** revealed that isothermal γ→ε transformation occurred during the ***,the difference in γ/ε phase distribution was a result of the thermal history determining which method phase transformation was taking place,which can be influenced by the PBF-EB process *** the sample with a low energy input(Earea=2.6 J/mm2),the martensitic transformation was *** the building height increased from the bottom,the e phase fraction *** the other hand,in the sample with a higher energy input(Earea=4.4 J/mm2),the ε phase fo rmed via diffusional-massive transformation and only appea red in a short range of the lower part away from the bottom.

关键词： Powder bed fusion with electron beam Phase transformation Thermal history Numerical simulation