检索结果-南通市图书馆

Study on direct point spread function measurement of capillary plate collimators with divergent X-ray beams

Radiation Detection Technology and Methods 2023年第3期7卷 321-336页

作者： Tianming Li tao luo Yupeng Xu Huilin He Liming Song Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of ScienceBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China

Purpose The Filed of View(FOV)of eXTP/LAD is limited by lead-glass capillary plate collimators placed in front of the Silicon Drift Detectors(SDDs)for reducing the background contamination caused by the photons of Cosmic X-ray Background(CXB)leaking from outside the *** core quality parameters of lead-glass capillary plate collimators are Open Area Ratio(OAR)and *** performance of lead-glass capillary plate collimators is determined by its design specification such as pore-to-pore misalignment,pore perpendicularity with collimator surface and pore *** the design specification is the result of a large number of micropores,we use the full width at half maximum(FWHM)and peak value of point spread function(PSF)to characterize the capillary plate collimator *** order to quickly evaluate the performances of collimators,we developed a direct PSF measurement method using divergent *** In this paper,the simulation package of the divergent beamsmeasurement setup is developed based on *** simulation parameters of scintillator absorption length are corrected by experimental *** simulate the PSF of collimators with different distribution of pore diameter and misalignment by parallel beams and divergent *** comparing the peak value and FWHM of collimators PSF,the feasibility in replacing parallel beams measurement with divergent beams measurement is *** It is verified that the influence of the geometric size of 33μm radius of the micro-focus of X-ray tube can be *** results show that the FWHM of collimators is increased with error root mean square error(RMS)of the distribution of collimators pore diameter and pore inclination *** peak value of PSF is mainly influenced by pore non-parallelism of the pores,and it decreases with an increase in pore inclination *** of parallel beams PSF and divergent beams PSF shows well consistency of peak value and FWHM of ***,the peak value of

关键词： Geant4 EXTP/LAD Capillary plate collimators Divergent X-ray beams measurment

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

Discovery of extended structures around two evolved planetary nebulae M2–55 and Abell 2

引用

Research in Astronomy and Astrophysics 2020年第7期20卷 149-160页

作者： Chih-Hao Hsia Yong Zhang Xi-Liang Zhang tao luo State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyTaipaMacaoChina School of Physics and Astronomy Sun Yat-Sen University Zhuhai CampusTangjiaZhuhai 519082China Yunnan Observatories Chinese Academy of SciencesKunming 650216China

We report a multi-wavelength study of two evolved planetary nebulae(PNs)M 2–55 and Abell *** optical narrow-band images([O III],Hα,and[N II])of M 2–55 reveal two pairs of bipolar lobes and a new faint arc-like *** arc-shaped filament around M 2–55 appears as a well-defined boundary from southwest to southeast,strongly suggesting that this nebula is in interaction with its surrounding interstellar *** the imaging data of Wide-field Infrared Survey Explorer(WISE)all-sky survey,we discovered extensive mid-infrared halos around these PNs,which are approximately twice the size of their main nebulae seen in the *** also present a mid-resolution optical spectrum of M 2–55,which shows that it is a high-excitation evolved PN with a low electron density of 250 cm^-***,we investigate the properties of these nebulae from their spectral energy distributions(SEDs)by means of archival data.

关键词： infrared:ISM ISM:structure planetary nebulae:individual(M2–55 and Abell 2) stars:AGB and post-AGB

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

Residents'urbanized landscape preferences in rural areas reveal the importance of naturalness-livability contrast

引用

Journal of Geographical Sciences 2022年第8期32卷 1493-1512页

作者： YANG Gaoyuan YU Zhaowu luo tao LONE Soderkvist Kristensen Department of Environmental Science and Engineering Fudan UniversityShanghai 200438China Department of Geosciences and Natural Resource Management Faculty of ScieneeUniversity of Copen・hagenCopenhagen 1958Denmark College of Architecture and Urban Planning Fuzhou UniversityFuzhou 350108China

Urbanization has caused significant landscape changes in rural areas,leading to the emergence of urbanized landscapes(ULs),which have been generally criticized by authorities and ***,perceptions of ULs among local residents have rarely been *** this study,we chose five typical categories of ULs from rapidly transforming villages in Fujian Province,China–hardened water bank(HWB),big pavilion(BPA),big memorial arch(BMA),big ornamental lawn(BOL),and big square(BSQ)to do the *** identified how these ULs were rated and ranked by on-site surveys,as well as how related aesthetic and multifunctional landscape characters(LCs)played a *** results(N=550)showed that 1)residents supported the construction of ULs,and the most preferred category was that with the most natural elements(BOL)that was simultaneously well maintained.2)For the residents,the longer they had resided in the village and the fewer connections they had with the city,the more in favor they were of the ULs,and the more eager they were for landscape *** addition,residents with higher education and Communist Party of China membership valued the naturalness related LCs more highly.3)Two contradictory preference features,naturalness and livability,should be well coordinated and balanced to construct an improved favorable village for the residents,to realize a balanced and sustainable development *** study makes great theoretical contributions to landscape research and provides new insights into rural planning and construction.

关键词： landscape change urbanized landscapes residents landscape preference landscape characters landscape planning rural areas

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

The gap junction blocker carbenoxolone enhances propofol and sevoflurane-induced loss of consciousness

引用

Neural Regeneration Research 2012年第7期7卷 492-495页

作者： Zhigang Liu Yongfang Liu Bo Zhao Li Du Zhongyuan Xia Xiangdong Chen tao luo Department of Anesthesiology Renmin Hospital of Wuhan University Wuhan 430060 Hubei Province China Department of Anesthesiology Wuhan First Hospital Wuhan 430022 Hubei Province China

General anesthetics induce loss of consciousness by inhibiting ascending arousal pathways, and they interfere with gap junction electrical coupling. The present study aimed to determine whether inhibition of gap junction-mediated signaling could influence general anesthetic-induced loss of consciousness. The general anesthetics sevoflurane and propofol were used. Intracerebroventricular administration of carbenoxolone, a gap junction blocker, significantly decreased the time to loss of the righting reflex （P 0.05）, but prolonged the time to recovery of the reflex （P 0.05）. Moreover, intracerebroventricular administration of carbenoxolone increased the sensitivity to sevoflurane, with a leftward shift of the loss of righting reflex dose-response curve, and decreased the 50% effective concentration of sevoflurane. These results suggest that the gap junction blocker carbenoxolone enhances propofol and sevoflurane-mediated general anesthesia.

关键词： gap junction blocker propofol sevoflurane general anesthesia nerve block neuropharmacology

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

Hydrothermal pretreatment of rice straw at relatively lower temperature to improve biogas production vict anaerobic digestion

引用

Chinese Chemical Letters 2019年第6期30卷 1219-1223页

作者： tao luo Hailong Huang Zili Mei Fei Shen Yihong Ge Guoquan Hu Xi Meng Biogas Institute of Ministry of Agriculture (BIOMA) Chengdu 610041 China College of Environment Sciences Sichuan Agricultural University Chengdu 611130 China

Although the degradation mechanism of straw anaerobic digestion is still obscure,lower temperature thermop hysical pretreatment might be a feasible way to improve biogas fermentation efficiency and net energy production in whole *** this study,the performances of rice straw(RS)degradation and biogas production were examined at different pretreatment temperatures from 90 ℃ to 130℃ to identify the optimal *** increasing pretreatment temperature,the change in cellulose and hemicellulose degradation in all the tests was directly related to volatile fatty acids(VFAs)content,but did not correspond to the variation in cumulative methane *** 100℃ and 130℃presented similar ideal digestion performances with highest methane yields of 127.6 and 124.6 mL/g TS,respectively,which were 22.80%and 19.83%higher than that noted in the *** test at 100 ℃pretreatment,which achieved 12.8%higher net energy production from RS than that observed in the control,could be considered as the optimal choice,the surplus biogas could only meet 75.9%of energy requirement for pretreated water temperature ***,mesophilic or thermophilic fermentation,lower pretreatment water input,and reuse of excess heat are recommended as feasible working conditions for improving net biogas production.

关键词： Ignocellulosic Degradation Fermentation Whole slurry Net energy

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 New Species of the Asian Leaf Litter Toad Genus Leptobrachella(Amphibia,Anura,Megophryidae)from Chongqing City,Southwest China

引用

Asian Herpetological Research 2022年第2期13卷 75-95页

作者： tao luo Weifeng WANG Dong PENG Bo LEI Huaiqing DENG Shengnan JI Heqing HUANG Jiang ZHOU School of life Sciences Guizhou Normal UniversityGuiyang 550001GuizhouChina School of Karst Science Guizhou Normal UniversityGuiyang 550001GuizhouChina Biodiversity Research Center Chinese Research Academy of Environmental SciencesBeijing 100012China Chongqing Academy of Environmental Science Chongqing 401147China

Herein we describe a new species,Leptobrachella yunyangensis ***.,from Yunyang County,Chongqing City,China,based on a combination of molecular and morphological *** analysis based on the mitochondrial 16 S rRNA gene and six nuclear genes indicated that this new species represented an independent evolutionary *** uncorrected genetic distance between the new species and its closest congener species,***,was 5.4 % for 16 S *** new species can be distinguished from its congeners by a combination of the following characters:(1) moderate body size(SVL28.3-30.6 mm in males);(2) rough dorsal skin,with sparse large granules and tubercles and short longitudinal ridges on the shoulder;(3) distinctly discernible tympanum with a diameter smaller than that of the eye(TMP/EYE ratio:0.51) and a distinct black supra tympanic line present;(4)an internasal distance almost equal to interorbital distance(IND/IOD ratio:1.05);(5) flanks with several dark spots arranged longitudinally in two rows;(6) distinctly visible supra-axilla ry,femoral,pectoral,a nd ventrola teral glands;(7) bicolored iris,with the upper 1/3 of the iris being copper orange and the lower 2/3 a light silvery grey;(8) relative finger lengths of Ⅰ <Ⅱ=Ⅳ <Ⅲ and relative toe lengths of Ⅰ <Ⅱ <Ⅴ <Ⅲ <Ⅳ;(9) absence of webbing and lateral fringes on fingers,and toes with rudimentary webbing and narrow lateral fringes;(10) heels overlapping when the thighs are positioned at right angles to the body;(11) tibiotarsal articulation reaching to the anterior corner of the eye when the leg is stretched forward;(12) ventral surfaces of the throat,chest,and belly greyish white with purple-brown speckling;(13) lacking distinct blackish dorsolateral markings;and(14) transverse dark brown bars on the surfaces of limbs and digits.

关键词： mitochondrial DNA morphology new species nuclear gene taxonomy

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

Comparison of Flame-retardancy Property and Mechanism between a Phosphate Ester and a Phosphoramine Flame-retardants

引用

Journal of Wuhan University of Technology(Materials Science) 2021年第1期36卷 148-156页

作者： QIN Shiqian YANG Zhiyi ZHANG Shuai ZHANG Zhiye WANG Xinlong YANG Xiushan luo tao YANG Lin School of Chemical Engineering Sichuan UniversityChengdu 610065China

A halogen-free flame-retardant (hydroquinone bis (N,N’-diarylphosphoramidate),4N-HDP) containing phosphorus-nitrogen was *** structure was characterized by infrared spectroscopy (IR),nuclear magnetic resonance (^(1)H-NMR and^(31)P-NMR).Thermogravimetric analysis (TG),limiting oxygen index (LOI),UL-94 vertical burning test (UL-94),thermogravimetric-infrared instrument (TG-IR) and scanning electron microscopy (SEM) were used to compare the flame-retarding performance and mechanism of hydroquinone bis (diphenyl phosphate) (HDP) and ***,IR and TG-IR were used for comparative analysis,indicating that both HDP and 4N-HDP are flame-retardants,and the gas phase and condensed phase act *** the pyrolysis process,it is divided into two steps:the first step is the breakage of large molecules to small molecules;the second step is the gasification and carbonization of small molecules,and eventually produces phosphate ester and non-flammable *** the comparison of various results,it could be found that 4N-HDP has better flame-retarding performance compared to HDP in the composite with polycarbonate (PC).

关键词： flame-retardant phosphoramine thermogravimetric analysis polycarbonates TG-IR

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

Effects of policies and containment measures on control of COVID- 19 epidemic in Chongqing

引用

World Journal of Clinical Cases 2020年第14期8卷 2959-2976页

作者： Xiao-Hua Liang Xian Tang Ye-tao luo Min Zhang Ze-Pei Feng Clinical Epidemiology and Biostatistics Department Children’s Hospital of Chongqing Medical UniversityMinistry of Education Key Laboratory of Child Development and DisordersNational Clinical Research Center for Child Health and DisordersKey Laboratory of Pediatrics in ChongqingChina International Science and Technology Cooperation Center of Child Development and Critical DisordersChongqing 400014China

BACKGROUND Coronavirus disease 2019(COVID-19)is an emerging,rapidly evolving disease that spreads through the respiratory system and is highly *** March 2020,the World Health Organization declared the COVID-19 outbreak a *** China,the pandemic was controlled after 2 mo through effective policies and containment *** the detailed policies and containment measures used to control the epidemic in Chongqing will provide a reference for the prevention and control of COVID-19 in other areas of the *** To explore the effects of different policies and containment measures on the control of the COVID-19 epidemic in *** Epidemiological data on COVID-19 in Chongqing were prospectively collected from January 21 to March 15,*** policies and prevention measures implemented by the government during the epidemic period were also *** analysis was performed to explore the impact of the main policy measures on the effectiveness of the control of COVID-19 in *** of March 15,the cumulative incidence of COVID-19 in Chongqing was 1.84/100000(576 cases)and the infection fatality rate was 1.04%(6/576).The spread of COVID-19 was controlled by effective policies that involved establishing a group for directing the COVID-19 epidemic control effort;strengthening guidance and supervision;ensuring the supply of daily necessities and medical supplies and equipment to residents;setting up designated hospitals;implementing legal measures;and enhancing health *** techniques were implemented to improve the recovery rate and control the *** such as“the lockdown of Wuhan”,“initiating a first-level response to major public health emergencies”,and“implementing the closed management of residential communities”significantly curbed the spread of *** the diagnosis process,shortening the diagnosis time,and constructing teams of clinical experts facilitated the provision of“one team of medi

关键词： Prevention policies Containment measures COVID-19 Epidemic trend Control effectiveness Public health

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

Surface-Enhanced Resonance Raman Spectra of Langmuir-Blodgett Films of Tetra-Lauryl Chloroaluminum Phthalocyanine

引用

Chinese Physics Letters 1992年第7期9卷 363-366页

作者： luo tao ZHANG Weiqing GAN Fuxi Shanghai Institute of Optics and Fine Mechanics Academia SinicaShanghai 201800

The Langmuir-Blodgett(LB)films of tetra-lauryl chloroaluminum phthalocyanine(TLAlCIPc)and a 1:1 mixture of TLAlCIPc and stearyl alcohol(SA)were *** Raman spectrum of solid TLAlCIPc in KBr pellet was *** the Raman lines were *** surface-enhanced resonance Raman spectra of the LB films deposited on the silver island film that were vacuum-deposited on glass slides have been observed.

关键词： silver films phthalocyanine

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

Dynamic evolution of oxide scale on the surfaces of feed stock particles from cracking and segmenting to peel-off while cold spraying copper powder having a high oxygen content

引用

Journal of Materials Science & Technology 2021年第8期67卷 105-115页

作者： Xiao-tao luo Yi Ge Yingchun Xie Yingkang Wei Renzhong Huang Ninshu Ma Chidambaram Seshadri Ramachandran Chang-Jiu Li State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049China The Key Lab of Guangdong for Modem Surface Engineering Technology Guangdong Institute of New MaterialsGuangzhou510651China Joining and Welding Research Institute Osaka UniversityOsaka567-0047fapan Department of Materials Science and Engineering The State University of New York at Stony BrookNew York117942275USA

The oxide scale present on the feedstock particles is critical for inter-particle bond formation in the cold spray(CS)coating process,therefore,oxide scale break-up is a prerequisite for clean metallic contact which greatly improves the quality of inter-particle bonding within the deposited *** general,a spray powder which contains a thicker oxide scale on its surface(i.e.,powders having high oxygen content)requires a higher critical particle velocity for coating formation,which also lowers the deposition efficiency(DE)making the whole process a challenging *** this work,it is reported for the first time that an artificially oxidized copper(Cu)powder containing a high oxygen content of 0.81 wt.%with a thick surface oxide scale of 0.71μm.,can help achieve an astonishing increment in DE.A transition of surficial oxide scale evolution starting with crack initiations followed by segmenting to peeling-off was observed during the high velocity particle impact of the particles,which helps in achieving an astounding increment in ***-particle deposit observations revealed that the thick oxide scale peels off from most of the sprayed powder surfaces during the high-velocity impact,which leaves a clean metallic surface on the deposited *** makes the successive particles to bond easily and thus leads to a higher ***,owning to the peeling-off of the oxide scale from the feedstock particles,very few discontinuous oxide scale segments are retained at inter-particle boundaries ensuring a high electrical conductivity within the resulting *** of the oxide scale threshold thickness for peeling-off during the high velocity particle impact was also investigated.

关键词： Cold spray Deposition efficiency Oxide scale fragmentation Inter-particle bonding Electrical conductivity

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

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：