检索结果-南通市图书馆

International Journal of Disaster Risk Science 2021年第3期12卷 367-380页

作者： Arneil G.Gabriel patrick neil m.santiago Rosemarie R.Casimiro Department of Public Administration Nueva Ecija University of Science and Technology3100 Cabanatuan CityPhilippines

Recent scientific consensus suggests that climate-related disasters are becoming more frequent and ***,increasing importance is given to disaster risk reduction(DRR)and climate change adaptation(CCA)in global *** projected global warming at 1.5℃and the climate variability that the Philippine archipelago experiences make DRR-CCA the key priorities of both the national and local government *** this study,we assessed and measured the degree of mainstreaming of DRR-CCA in the comprehensive development plans(CDPs)of the five component cities in the province of Nueva Ecija in the *** are among the areas in Central Luzon that are susceptible to hydrometeorological and geologic *** distributed survey questionnaires to 25 employees of the local government units in the five component cities in Nueva Ecija who are directly involved in planning *** triangulated their responses using archival data(review of written policies and plans).The main findings of the study indicate that in spite the presence of laws and policies on DRR-CCA,their implementation is only in the preliminary *** results also provide insights to policymakers and future researchers on the challenges and opportunities influencing the systemic mainstreaming of DRR-CCA in the province.

关键词： Climate-related disasters Global warming Local development planning Philippines Southeast Asia

Gamma-ray bursts and their links with supernovae and cosmology

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2012年第8期12卷 1139-1161页

作者： Peter mszros neil Gehrels Center for Particle and Gravitational Astrophysics Dept.of Astronomy&Astrophysics and Dept.of Physics Pennsylvania State UniversityUniversity ParkPA 16802USA Astrophysics Science Division NASA Goddard Space Flight CenterGreenbeltMD 20771USA

Gamma-ray bursts are the most luminous explosions in the Universe, whose origin and mechanism are the focus of intense interest. They appear connected to su- pernova remnants from massive stars or the merger of their remnants, and their bright- ness makes them temporarily detectable out to the largest distances yet explored in the universe. After pioneering breakthroughs from space and ground experiments, their study is entering a new phase with observations from the recently launched Fermi satellite, as well as the prospect of detections or limits from large neutrino and gravitational wave detectors. The interplay between such observations and theoretical models of gamma-ray bursts is reviewed, and cosmology. as well as their connections to supernovae

关键词： gamma-ray sources -- gamma-ray bursts -- cosmic rays -- neutrinos-- supernovae -- cosmology -- intergalactic medium

Equity and seeking treatment for young children with fever in Nigeria: a cross-sectional study in Cross River and Bauchi States

在线全文

学校读者我要写书评

暂无评论

Infectious Diseases of Poverty 2015年第1期4卷 1-8页

作者： Bikom patrick Odu Steven mitchell Hajara Isa Iyam Ugot Robbinson Yusuf Anne Cockcroft neil Andersson CIET Trust 71 Oxford RoadSaxonwoldJohannesburg 2196South Africa CIET/PRAm Department of Family MedicineMcGill University5858 Côte-des-NeigesSuite 300MontrealQC H3Z 1Z1Canada Community Health Department and Roll Back malaria Program CalabarCross River StateNigeria State ministry of Health BauchiBauchi StateNigeria CIET Trust Botswana PO Box 1240GaboroneBotswana

Background:Poor children have a higher risk of contracting malaria and may be less likely to receive effective *** is an important cause of morbidity and mortality in Nigerian children and many cases of childhood fever are due to *** study examined socioeconomic factors related to taking children with fever for treatment in formal health ***:A household survey conducted in Bauchi and Cross River states of Nigeria asked parents where they sought treatment for their children aged 0–47 months with severe fever in the last month and collected information about household socio-economic *** also recorded whether there was a health facility in the *** used treatment of severe fever in a health facility to indicate likely effective treatment for *** analysis in each state examined associations with treatment of childhood fever in a health ***:43%weighted(%wt)of 10,862 children had severe fever in the last month in Cross River,and 45%wt of 11,053 children in *** these,less than half(31%wt Cross River,44%wt Bauchi)were taken to a formal health facility for *** were more likely to be taken to a health facility if there was one in the community(OR 2.31[95%CI 1.57–3.39]in Cross River,OR 1.33[95%CI 1.0–1.7]in Bauchi).Children with fever lasting less than five days were less likely to be taken for treatment than those with more prolonged fever,regardless of whether there was such a facility in their *** mothers were more likely to take children with fever to a formal health *** communities with a health facility in Cross River,children from less-poor households were more likely to go to the facility(OR 1.30;95%CI 1.07-1.58).Conclusion:There is inequity of access to effective malaria treatment for children with fever in the two states,even when there is a formal health facility in the *** the details of inequity of access in th

关键词： Severe fever malaria Equity Access to care Nigeria

Ultrafast laser dynamics of metal organic frameworks/TiO_2 nano-arrays hybrid composites for energy conversion applications

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 Energy Chemistry 2019年第2期28卷 88-94页

作者： Fatma m.Ismail Daniel O'neil Tareq Youssef Souad A.Elfeky The National Institute of Laser Enhanced Sciences Cairo University Zewail City of Science and Technology Georgia Institute of Technology

Herein,we report the victorious synthesis of metal-organic frameworks(mOFs) on TiO_2 nanotubes(NTs)using a layer-by-layer(LbL) *** crystalline and homogenous thin films of mOFs were grown and characterized using XRD,SEm,FT-IR and UV/Vis ***,the utilization of the mOF films as sensitizers was probed in bespoke Graetzel type liquid junction solar *** constructed cell performance revealed an I_(sc) of 1.16 mA cm^(–2),Vocof 0.63 V,FF of 0.33,and E_(ff) of 0.42%.Further,pumpprobe transient laser spectroscopy was performed to investigate the energy and charge transfer dynamics of the mOFs/TiO_2 NTs *** results indicated 86% injection *** ultrafast pump-probe spectroscopy allows the investigation of this process and the differences between *** also showed that the relaxation of the mOF chromophores is in competition with electron injection in the Ti O2 *** this study provides a new insight into electron transfer from photoexcited metal-organic frameworks(mOFs) into titanium dioxide.

关键词： Ultrafast laser dynamics metal-organic frameworks TiO2 nano-arrays Energy conversion Thin film

On the existence of the compound“Ce_(3)NbO_(7+δ)”prepared under air atmosphere

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2021年第5期39卷 596-599页

作者： Shi-Kuan Sun Lucy m.mottram neil C.Hyatt Immobilisation Science Laboratory Department of Materials Science and EngineeringThe University of SheffieldSir Robert Hadfield BuildingMappin StreetS13JDUK

The solid state synthesis of the phase"Ce_(3)NbO_(7+δ)",from stoichiometric quantities of CeO_(2)and Nb_(2)O_(5),was investigated under air atmosphere,as previously described by Zhang et al.(Journal of Rare Earths,2007,25,730-733),A combination of powder X-ray diffraction,scanning electron microscopy with energy dispersive X-ray analysis,and laboratory Ce L_(3)X-ray absorption spectroscopy,demonstrates the product of the reaction to be a mixture of CeO_(2)and CeNbO_(4).These data,and reexamination of the published X-ray diffraction data of"Ce_(3)NbO_(7+δ)",are consistent with this phase in fact being CeO_(2).No evidence for the formation of a phase of composition"Ce_(3)NbO_(7+δ)"is found,by solid state synthesis under air atmosphere.

关键词： Cerium Niobium XANES XRD Ceramic Rare earths

Local and range-wide distribution of song types suggest Ovenbirds(Seiurus aurocapilla)have song neighborhoods but not macro-dialects

在线全文

学校读者我要写书评

暂无评论

Avian Research 2023年第2期14卷 191-199页

作者： patrick m.Jagielski Jennifer R.Foote Department of Biology Algoma UniversitySault Ste.MarieONCanada

The song systems of oscine passerines(songbirds)are complex and *** songs are used for both mate attraction and territory defense and are therefore important signals for survival and reproduction,comprehensive knowledge of within and among species song structure and distribution is informative for understanding the evolution of song repertoires and vocal *** this study,we explored variation in the song structure of the Ovenbird(Seiurus aurocapilla),a widespread warbler(Family Parulidae)found in North American *** analyzed recordings from the 2021 breeding season to assess song type variation at a local(n=158 birds;Sault ***,ON)and breeding range scale(n=512 birds;eBird).We characterized the local song types and tested whether Ovenbirds share song types with their neighbors more often than expected by *** then characterized song types of Ovenbirds across the breeding range to determine whether any geographic pattern of song clustering exists(i.e.,macro-dialects).We found 10 distinct song types and some evidence for song type clustering at the local study site(i.e.,song neighborhoods).We found 7 of those 10 song types throughout the breeding range and identified an additional 24 types that were not recorded in our local *** found no evidence for song dialects across the Ovenbird breeding *** study contributes to our understanding of Ovenbird song while simultaneously adding to our understanding of geographic structuring of warbler *** work contributes to delineating a more comprehensive understanding of factors affecting dialect development for this diverse group of songbirds.

关键词： Dialects eBird Geographic variation Ovenbird Parulidae Seiurus aurocapilla Song type

A direct solver with O（N） complexity for integral equations on one-dimensional domains

在线全文

学校读者我要写书评

暂无评论

Frontiers of mathematics in China 2012年第2期7卷 217-247页

作者： Adrianna GILLmAN patrick m. YOUNG Per-Gunnar mARTINSSON Department of Applied mathematics University of Colorado at Boulder BoulderCO 80309-0526 USA

An algorithm for the direct inversion of the linear systems arising from NystrSm discretization of integral equations on one-dimensional domains is described. The method typically has O（N） complexity when applied to boundary integral equations （BIEs） in the plane with non-oscillatory kernels such as those associated with the Laplace and Stokes＇ equations. The scaling coefficient suppressed by the ＂big-O＂ notation depends logarithraically on the requested accuracy. The method can also be applied to BIEs with oscillatory kernels such as those associated with the Helmholtz and time-harmonic maxwell equations; it is efficient at long and intermediate wave-lengths, but will eventually become prohibitively slow as the wave-length decreases. To achieve linear complexity, rank： deficiencies in the off-diagonal blocks of the coefficient matrix are exploited. The technique is conceptually related to the H- and H2-matrix arithmetic of Hackbusch and coworkers, and is closely related to previous work on Hierarchically Semi-Separable matrices.

关键词： Direct solver integral equation fast direct solver boundary value problem boundary integral equation hierarchically semi-separable matrix mSC 65R20,65F05

Importance of being Nernst: Synaptic activity and functional relevance in stem cell-derived neurons

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Stem Cells 2015年第6期7卷 899-921页

作者： Aaron B Bradford patrick m mcNutt Cell/molecular Biology Branch US Army Medical Research Institute of Chemical DefenseAberdeen Proving Grounds-EAMD 21010United States

Functional synaptogenesis and network emergence are signature endpoints of neurogenesis. These behaviors provide higher-order confirmation that biochemical and cellular processes necessary for neurotransmitter release, post-synaptic detection and network propagationof neuronal activity have been properly expressed and coordinated among cells. The development of synaptic neurotransmission can therefore be considered a defining property of neurons. Although dissociated primary neuron cultures readily form functioning synapses and network behaviors in vitro, continuously cultured neurogenic cell lines have historically failed to meet these criteria. Therefore, in vitro-derived neuron models that develop synaptic transmission are critically needed for a wide array of studies, including molecular neuroscience, developmental neurogenesis, disease research and neurotoxicology. Over the last decade, neurons derived from various stem cell lines have shown varying ability to develop into functionally mature neurons. In this review, we will discuss the neurogenic potential of various stem cells populations, addressing strengths and weaknesses of each, with particular attention to the emergence of functional behaviors. We will propose methods to functionally characterize new stem cell-derived neuron(SCN) platforms to improve their reliability as physiological relevant models. Finally, we will review how synaptically active SCNs can be applied to accelerate research in a variety of areas. Ultimately, emphasizing the critical importance of synaptic activity and network responses as a marker of neuronal maturation is anticipated to result in in vitro findings that better translate to efficacious clinical treatments.

关键词： Synapses Neurotransmission In vitrotechniques Induced pluripotent stem cells Neuronalnetworks Neurogenesis Neural stem cells Embryonicstem cells Induced neurons

Stroma-targeting strategies in pancreatic cancer:Past lessons,challenges and prospects

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2021年第18期27卷 2105-2121页

作者： Faran Polani patrick m Grierson Kian-Huat Lim Division of Oncology Department of Internal MedicineBarnes-Jewish Hospital and The Alvin J.Siteman Comprehensive Cancer CenterWashington University School of MedicineSaint LouisMO 63110United States

Pancreatic ductal adenocarcinoma(PDAC)is projected to emerge as the second leading cause of cancer-related death after *** treatment resistance is perhaps the most significant factor that underlies the poor prognosis of *** date,combination chemotherapy remains the mainstay of treatment for most PDAC *** to other cancer types,treatment response of PDAC tumors to similar chemotherapy regimens is clearly much lower and *** from typically harboring genetic alterations that to date remain undruggable and are drivers of treatment resistance,PDAC tumors are uniquely characterized by a densely fibrotic stroma that has well-established roles in promoting cancer progression and treatment ***,emerging evidence also suggests that indiscriminate targeting and near complete depletion of stroma may promote PDAC aggressiveness and lead to detrimental *** conflicting results undoubtedly warrant the need for a more in-depth understanding of the heterogeneity of tumor stroma in order to develop modulatory strategies in favor of tumor *** advent of novel techniques including single cell RNA sequencing and multiplex immunohistochemistry have further illuminated the complex heterogeneity of tumor cells,stromal fibroblasts,and immune *** new knowledge is instrumental for development of more refined therapeutic strategies that can ultimately defeat this ***,we provide a concise review on lessons learned from past stromatargeting strategies,new challenges revealed from recent preclinical and clinical studies,as well as new prospects in the treatment of PDAC.

关键词： Stroma Pancreatic cancer Treatment resistance Cancer-associated fibroblasts Clinical trials

The role of ultrasonic bat detectors in improving inventory and monitoring surveys in Vietnamese karst bat assemblages

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2009年第5期55卷 327-341页

作者： neil m.FUREY Iain J.mACKIE Paul A.RACEY School of Biological Sciences University of AberdeenAberdeen

Bats account for 30% of mammal diversity in SE Asia and are potential bioindicators of wider biodiversity impacts resulting from habitat loss and climate change. As existing sampling techniques in the region typically fail to record bats that habitually fly in open areas and at higher altitudes, current inventory efforts are less than comprehensive. Acoustic sampling with bat detectors may help to overcome these limitations for insectivorous bats, but has yet to be tested in mainland SE Asia. To do so, we sampled bats while simultaneously recording the echolocation calls of insectivorous species commuting and foraging in a variety of karst habitats in north Vietnam. monitoring of cave-dwelling bats was also undertaken. Discriminant function analysis of 367 echolocation calls produced by 30 insectivorous species showed that acoustic identification was feasible by correctly classifying 89. 1% of calls. In all habitats, acoustic sampling and capture methods recorded significantly more species each night than capture methods alone. Capture methods consequently failed to record 29% （ten spp. of aerial insectivores） of the bat fauna in commuting and foraging habitats and 11% （two spp. ） of that in our cave sample. Only four of these species were subsequently captured following significantly greater sampling effort. This strongly suggests that acoustic methods are indispensable for maximizing bat inventory completeness in SE Asia. As accurate inventories and monitoring are essential for effective species conservation, we recommend the inclusion of acoustic sampling in future studies of bat assemblages across the region [ Current Zoology 55 （5）： 327 - 341, 2009].

关键词： Bats Echolocation Inventory completeness Karst Vietnam