检索结果-南通市图书馆

Ultra-Dense Networking Architectures and Technologies for 5G

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

ZTE Communications 2018年第2期16卷 1-2页

作者： victor c.m.leung zhang haijun the University of Brit⁃ish Columbia(UBS) Canada the Royal Soci⁃ety of Canada the Canadian Academy of Engineering and the Engineering Institute of Canada IEEE University of Science and Technology Beijing China Department of Electrical and Computer Engineering the University of British Columbia(UBC)Canada

With the continuous enrichment of mobile communication application scenarios in the future, the traditional macro-cellular-based mobile communication network architecture will be difficult to meet the explosive growth... 详细信息

关键词： In Ultra-Dense Networking Architectures and Technologies for 5G

Landscape genetics reveals inbreeding and genetic bottlenecks in the extremely rare short-globose cacti mammillaria pectinifera (Cactaceae) as a result of habitat fragmentation

在线全文

学校读者我要写书评

暂无评论

Plant Diversity 2017年第1期39卷 13-19页

作者： Reyna maya-Garcia Santiago Arizaga Pablo Cuevas-Reyes Juan manuel Penaloza-Ramirez victor Rocha Ramirez Ken Oyama Facultad de Biologia Universidad Michoacana de San Nicolas de Hidalgo Mexico Escuela Nacional-de Estudios Superiores Unidad morelia UNAM Antigua Carretera a Pdtzcuaro 8701 Colonia Ex-Hacienda de SanJose de la Huerta58190 Morelia Michoacan Mexico

mammillaria pectinifera is an endemic, short-globose cactus species, included in the IUCN list as a threatened species with only 18 remaining populations in the Tehuacfin-Cuicatlan Valley in central mexico. We evaluated the population genetic diversity and structure, connectivity, recent bottlenecks and population size, using nuclear microsatellites. m. pectinifera showed high genetic diversity but some evidence of heterozygote deficiency （F15）, recent bottlenecks in some populations and reductions in population size. Also, we found low population genetic differentiation and high values of connectivity for m. pectinifera, as the result of historical events of gene flow through pollen and seed dispersal. m. pectinifera occurs in sites with some degree of disturbance leading to the isolation of its populations and decreasing the levels of gene flow among them. Excessive deforestation also changes the original vegetation damaging the natural habitats. This species will become extinct if it is not properly preserved. Furthermore, this species has some ecological features that make them more vulnerable to disturbance such as a very low growth rates and long life cycles. We suggest in situ conservation to prevent the decrease of population sizes and loss of genetic diversity in the natural protected areas such as the Tehuacan-Cuicatlan Biosphere Reserve. In addition, a long-term ex situ conservation program is need to construct seed banks, and optimize seed germination and plant establishment protocols that restore disturbed habitats. Furthermore, creating a supply of living plants for trade is critical to avoid further extraction of plants from nature.

关键词： mammiUaria pectiniferaNuclear SSRGenetic diversityRecent bottlenecksEffective population size

Advancements in Web3 Infrastructure for the metaverse

在线全文

学校读者我要写书评

暂无评论

ZTE Communications 2024年第2期22卷 1-2页

作者： victor C.m.LEUNG CAI Wei the Artificial Intelligence Research Institute Shenzhen MSU-BIT University Shenzhen mSU-BIT University Shenzhen University the Wireless Networks and mobile Systems(WiNmoS)Laboratory at UBC the School of Science and Engineering at The Chinese University of Hong Kong Shenzhen the Human-Crypto Society Laboratory the CUHK(SZ)White matrix Joint metaverse Laboratory

Web3,also known as Web 3.0,has recently been attracting increasing attention from industry and *** the potential of blockchain technologies,Web3 has emerged as a pivotal foundation in the realm of metaverse development,which is considered by many as the next-generation ***,Web3 technologies such as smart contracts and protocols like non-fungible tokens(NFTs)have supported the immersive and content-rich experience of current Web3 metaverse projects.

关键词： Web token attracting

molecular identification and population dynamics of two species of Pemphigus （Homoptera： Pemphidae） on cabbage

在线全文

学校读者我要写书评

暂无评论

Insect Science 2009年第2期16卷 115-124页

作者： Naiqi Chen Tong-Xian Liu mamoudou Setamou J. victor French Eliezer S. Louzada Department of Entomology Texas AgriLife Research Texas A&M University System Weslaco Citrus Center Texas A&M University- Kingsville Citrus Center Weslaco TX 78596 USA

The poplar petiole gall aphid, Pemphiguspopulitransversus Riley, has been one of the major pests on cruciferous vegetable in the Rio Grande Valley （LRGV） of Texas since the late 1940s. It normally migrates from poplar trees to cruciferous vegetables in the fall, and migrates back to the trees in early spring of the coming year. Some root-feeding aphids were found on cruciferous vegetables in late spring and early summer in 1998 and the following years. Those aphids have been identified as Pemphigus obesinymphae moran. This discovery completely changed the current knowledge about the root-feeding aphids on cruciferous vegetables in the LRGV. Due to their small size, morphological and feeding similarities between P. populitransversus and P. obesinymphae, their identification and distinction are difficult. In this study, random amplification of polymorphic DNA （RAPD） and amplified fragment length polymorphism （AFLP） were used to distinguish these two species over a period of time when the two species occurred together, or separately, in cabbage fields. The two species occurred on cabbage at different times of the year, and overlapped from October to June. From may to October, both species migrated to their primary hosts. The apterous aphids found on cabbage in winter contained mainly P. obesinymphae, whereas in early spring more apterous P. populitransversus were recovered. The root-feeding aphids would feed on cabbage plants as long as this host was available even during the hot, dry summer in the LRGV, although their populations were generally low. Both RAPD and AFLP techniques were efficient in discriminating the two species that showed obviously genetic variability. These molecular techniques confirmed the existence of the two aphid species in apterous samples collected from the soil in cabbage fields in the LRGV, and the results performed by RAPD were confirmed by AFLP. Furthermore, the results suggest that RAPD technique was a better choice despite its reproducib

关键词： AFLP cabbage identification RAPD root aphid

Dynamic assessment of variations in pupil diameter using swept‑source anterior segment optical coherence tomography after phakic collamer lens implantation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Eye and Vision 2021年第6期8卷 396-403页

作者： Felix Gonzalez‑Lopez Carmen Bouza‑miguens victor Tejerina Vasyl Druchkiv Blas mompean Julio Ortega‑Usobiaga Rafael Bilbao‑Calabuig Department of Refractive Surgery Clinica BavieraMelchor Fernández Almagro928029 MadridSpain Department of Research and Development Clinica BavieraValenciaSpain

Purpose:To dynamically assess variations in pupil diameter induced by changes in brightness in myopic eyes implanted with an implantable collamer lens(ICL,STAAR Surgical)with a central ***:This prospective,observational single-center case series study comprised 65 eyes from 65 consecutive patients undergoing ICL implant.A modified commercially available swept-source Fourier-domain anterior segment optical coherence tomography(AS-OCT)device was used for imaging and performing dynamic pupillometry under changing light conditions before and after a mean follow-up interval of four months after ***:Preoperative mean pupil size under photopic conditions was 3.38±0.64 mm;after surgery,this increased to 3.48±0.61 *** pupil size under scotopic light conditions was 5.72±0.79 mm before surgery and 5.84±0.77 mm *** differences between preoperative and postoperative pupil diameter in miosis and mydriasis were 0.10±0.44 mm(P=0.078)and 0.12±0.58 mm(P=0.098),*** scotopic pupil exceeded the optic zone of the implanted lens in 39 eyes(60%).The mean central vault value was 412±177μm under maximum miosis and 506±190μm under maximum *** found a positive correlation between vault and differences in pupil diameter under all light conditions(Pmic AS-OCT enables a very precise determination of the pupillary diameter in the iris *** changes in the pupil diameter under different light conditions after the implantation of an ICL are related to the postoperative vault.

关键词： Phakic collamer lens ICL Pupil OCT Central hole Central port Posterior chamber phakic lens

Galvanic and asymmetry effects on the local electrochemical behavior of the 2098-T351 alloy welded by friction stir welding

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10期42卷 162-175页

作者： mariana X.milagre Uyime Donatus Naga V.mogili Rejane maria PSilva Barbara victoria Gde Viveiros victor F.Pereira Renato A.Antunes Caruline S.Cmachado Joao victor S.Araujo Isolda Costa Instituto de Pesquisas Energeticas e Nucleares IPEN/CNENAv.Prof.Lineu Prestes2242Sao PauloBrazil Laboratorio Nacional de Nanotecnologia LNNano/CNPENRua Giuseppe Maximo Scolfaro10.000Polo II deAlta Tecnologia de CampinasBrazil Centro de Engenharia Modelagem e Ciencias Sociais AplicadasUFABCAv.dos Estados 5001Santo AndreBrazil

Scanning electrochemical microscopy(SECm)and scanning vibrating electrode technique(SVET)were used to investigate the electrochemical behaviour of the top surface of the 2098-T351 alloy welded by friction stir welding(FSW).The SVET technique was efficient in identifying the cathodic and anodic weld *** welding joint(WJ),which comprises the thermomechanically affected zone(TmAZ)and the stir zone(SZ),was cathodic relative to the heated affected zone(HAZ)and the base metal(Bm).The reactivities of the welding joint at the advancing side(AS)and the retreating side(RS)were analyzed and compared using SECm technique in the competition mode by monitoring the dissolved oxygen as a redox mediator in 0.005 mol L^-1 NaCl *** RS was more electrochemically active than the AS,and these results were correlated with the microstructural features of the welded alloy.

关键词： Aluminum alloys Friction stir welding Localized corrosion

Satellite mapping of air temperature under polar night conditions

在线全文

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2022年第2期25卷 325-336页

作者： Kritsuk Sergei victor Gornyy Tatiana Davidan Iscander Latypov Alexandra manvelova Pavel Konstantinov Andrei Tronin mikhail Varentsov mikhail Vasiliev Saint-Petersburg Scientific Research Center for Ecological Safety Russian Academy of SciencesSaint-PetersburgRussia Faculty of Geography/Research Computing Center Lomonosov Moscow State UniversityMoscowRussia

A novel satellite technique for air temperature mapping with a spatial resolution of~100 m was proposed for the town of Apatity,the Kola Peninsula(Russia),taken as a case *** main idea behind this novel technique is to find the statistical relationships between the land surface temperatures in each point of the study area,observed by multiple infrared thermal satellite imagery,and the time series of air temperatures recorded by World meteorological Organization(WmO)weather *** scenes of infrared thermal spectral band of the Landsat satellites for the period 2014–2019 were used,as well as the long-term time series of air temperature from the weather station and the results of air temperature observations carried out by the network of *** calm weather conditions,according to the ground truth,the error of air temperature mapping wasσ=1.5°C,and the precision was estimated asδ=1.0°*** analysis of the compiled air temperature map showed that,under polar night conditions,the air temperature on the hilltops was by 10–18°C higher than in the *** was concluded that,for economic reasons,as well as for the reasons of population health protection in the Arctic,it would be advisable to plan the placement of new cities on the *** of these new areas should be designed in a“semi-isolated”manner in order to minimize the time needed by the local people for crossing the lowlands between the nearby districts.A characteristic feature of modern megalopolises is their internal structure formed by the growing primary settlements that can be considered as nuclei interlinked by transportation ***,the new Arctic cities can be called“Arctic megalopolises”because of their internal structure that is specific to megalopolises.

关键词： Polar night town of Apatity air temperature satellite images time series regression mapping bioclimatic comfort

Evolution of NBS-LRR Gene Copies among Dicot Plants and its Regulation by members of the miR482/2118 Superfamily of miRNAs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

molecular Plant 2015年第2期8卷 329-331页

作者： victor m. Gonzalez Sebastian muller David Baulcombe Pere Puigdomenech Centre for Research in Agncultural Genomics (CRAG) CSIC-IRTA-UAB-UB Edifici CRAG Campus UAB 08193 Bellaterra Barcelona Spain Department of Plant Sciences University of Cambridge Downing Street Cambridge CB2 3EA UK

Dear Editor,A major function encoded in plant genome sequences is devoted to defense against pests and pathogens. Among the defenserelated functions in the plant genomes sequenced, there is a group of genes coding for NBS-LRR proteins that have been associated with effector-triggered immunity （Jones and Jones, 1997）. The majority of genes responsible for race-specific resistance in plants belong to this family.

关键词：蛋白质类基因基因组植物甲酰胺类社会控制正式微RNAs 胰岛素植物

白细胞介素-13刺激大鼠气道黏液高分泌的分子机制

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

南方医科大学学报 2011年第1期31卷 73-76页

作者：江德鹏 victor P Kolosov Juliy m Perelman 周向东重庆医科大学附属第二医院呼吸内科重庆400010 俄罗斯医学科学院远东呼吸生理与病理研究中心布拉戈维申斯克675000

目的研究白细胞介素-13(IL-13)在体内对支气管/肺黏液分泌的作用并探讨其作用机制。方法所有SD大鼠被随机分为IL-13组、对照组和IL-13 plus SP600125组。Western检测大鼠支气管/肺组织黏蛋白(mUC)5AC,磷酸化细胞外信号调节激酶1/2(p-ERK... 详细信息

目的研究白细胞介素-13(IL-13)在体内对支气管/肺黏液分泌的作用并探讨其作用机制。方法所有SD大鼠被随机分为IL-13组、对照组和IL-13 plus SP600125组。Western检测大鼠支气管/肺组织黏蛋白(mUC)5AC,磷酸化细胞外信号调节激酶1/2(p-ERK1/2)和磷酸化c-Jun氨基端激酶1/2(p-JNK1/2)的表达变化,RT-PCR检测大鼠支气管/肺组织STAT4和STAT6 mRNA表达水平。EmSA检测通路下游作用因子FOXA2和激活蛋白1的表达。结果同对照组相比,IL-13刺激10 h后大鼠支气管/肺组织mUC5AC和p-JNK1/2表达升高,而p-ERK1/2表达无显著变化;使用SP600125阻断JNK通路表达后,mUC5AC表达减弱;IL-13刺激10 h后大鼠支气管/肺组织STAT4 mRNA表达无显著变化,STAT6 mRNA表达显著升高,EmSA提示IL-13刺激后大鼠支气管/肺组织FOXA2结合活性显著降低,而激活蛋白1结合活性没有明显变化。结论 IL-13能够刺激大鼠支气管/肺组织黏液分泌,其作用机制可能是通过调控STAT6-FOXA2信号通路。

关键词：白细胞介素-13 STAT6 FOXA2蛋白黏液