检索结果-南通市图书馆

A Bifurcated Vascular Channel Construction Method based on Diploic Vein Characteristics

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

Journal of Bionic Engineering 2019年第5期16卷 814-827页

作者： jian qi Jia Li Shuxian Zheng Tianjin Key Laboratory of Equipment Design and Manufacturing Technology School of Mechanical EngineeringTianjin UniversityTianjin 300354China School ofMechanical Engineering Tianjin University of Technology and EducationTianjin 300222China

In skull bone tissue engineering,cells do not easily survive and proliferate in the scaffold because of the lack of nutrient transport *** address these problems,a vascular design and fabrication method based on human skull diploic vein characteristics was *** skull sample was scanned by micro-CT,and the 3D model was constructed by *** analyzing the characteristics of the diploic vein,the vascular centerline model,path model,taper model and bifurcation model were *** vascular network examples were constructed by iteration of the bifurcation *** mold method of constructing vascular scaffolds embedded within the bionic channels was *** scaffold material is PDMS,and the surface was coated with *** Human Umbilical Vein Endothelial Cells(HUVECs)were planted into the lumen of the channels for 7 days in vitro and found to be able to *** cells cultured for three days were fluorescently stained,and it was found that the cells were well attached to the surfaces of the *** vascular design and fabrication process can lay a foundation for vascularization in bone tissue engineering.

关键词： diploic vein vascular channels bifurcation model vascular mold vascular scaffold fabrication bionic

Cosmological Constraints on Neutrino Masses in Light of JWST Red and Massive Candidate Galaxies

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

Research in Astronomy and Astrophysics 2024年第4期24卷 7-12页

作者： jian-qi Liu Zhi-qi Huang Yan Su School of Physics and Astronomy Sun Yat-sen UniversityZhuhai 519082China CSST Science Center for the Guangdong-Hong Kong-Macao Greater Bay Area Zhuhai 519082China

The overabundance of the red and massive candidate galaxies observed by the James Webb Space Telescope(JWST)implies efficient structure formation or large star formation efficiency at high redshift z~*** the scenario of a low or moderate star formation efficiency,because massive neutrinos tend to suppress the growth of structure of the universe,the JWST observation tightens the upper bound of the neutrino *** A cold dark matter cosmology and a star formation efficiency∈[0.05,0.3](flat prior),we perform joint analyses of Planck+JWST and Planck+BAO+JWST,and obtain improved constraints∑m_(ν)<0.196 eV and ∑m_(ν)+<0.111 eV at 95% confidence level,*** on the above assumptions,the inverted mass ordering,which implies ∑m_(ν)≥0.1 eV,is excluded by Planck+BAO+JWST at 92.7% confidence level.

关键词： (cosmology:)cosmological parameters galaxies:abundances galaxies:formation neutrinos

Science Letters:Model for cascading failures in congested Internet

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第10期9卷 1331-1335页

作者： jian WANG Yan-heng LIU jian-qi ZHU Yu JIAO Key Lab of Symbolic Computation and Knowledge Engineering of Ministry of Education College of Computer Science and Technology Jilin University Changchun 130012 China

Cascading failures often occur in congested networks such as the Internet. A cascading failure can be described as a three-phase process： generation, diffusion, and dissipation of the congestion. In this account, we present a function that represents the extent of congestion on a given node. This approach is different from existing fimctions based on betweenness centrality. By introducing the concept of ＇delay time＇, we designate an intergradation between permanent removal and nonremoval. We also construct an evaluation fimction of network efficiency, based on congestion, which measures the damage caused by cascading failures. Finally, we investigate the effects of network structure and size, delay time, processing ability and packet generation speed on congestion propagation. Also, we uncover the relationship between the cascade dynamics and some properties of the network such as structure and size.

关键词： Complex network Cascading failures Congestion effects Propagation model

Two Kinds of New Lie Algebras for Producing Integrable Couplings

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第2X期46卷 203-208页

作者： YAN qing-You qi jian-Xun School of Business Administration North China Electric Power University Beijing 102206 China

Two types of Lie algebras are constructed, which are directly used to deduce the two resulting integrable coupling systems with multi-component potential functions. Many other integrable couplings of the known integra... 详细信息

关键词： KN hierarchy integrable couplings Lie algebra loop algebra

Physical Mechanism of the Impacts of the Tropical Atlantic Sea Surface Temperature on the Decadal Change of the Summer North Atlantic Oscillation

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2013年第5期6卷 365-368页

作者： SUN jian-qi Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Climate Change Research Center Chinese Academy of Sciences

In this study,physical mechanism of the impacts of the tropical Atlantic sea surface temperature(SST)on decadal change of the summer North Atlantic Oscillation(SNAO)was explored using an atmospheric general circulation model(AGCM)developed at the International Centre for Theoretical Physics(ICTP).The simulation results indicate that the decadal warming of the SST over the tropical Atlantic after the late 1970s could have significantly enhanced the convection over the *** enhanced convection would have strengthened the local meridional circulation over the Eastern Atlantic-North Africa-Western Europe region,exciting a meridional *** teleconnection might have brought the signal of the tropical Atlantic SST to the Extratropics,consequently activating the variability of the eastern part of the SNAO southern center,which led to an eastward shift of the SNAO southern center around the late *** physical processes are highly consistent with the previous observations.

关键词： summer North Atlantic Oscillation tropical Atlantic sea surface temperature teleconnection decadal change simulation

Hantavirus Infection during Pregnancy

在线全文

学校读者我要写书评

暂无评论

Virologica Sinica 2021年第3期36卷 345-353页

作者： Deng-Hui Lu Hong jiang jian-qi Lian The Center of Diagnosis and Treatment of Infectious Diseases The Second Affiliated HospitalAir Force Medical UniversityXi'an 710038China

Hantavirus infection is a global health challenge,causing widespread public *** recent years,cases of hantavirus infection in pregnant women have been reported in many *** infected pregnant women and their fetuses appear to have more severe clinical symptoms and worse clinical ***,to study the prevalence of hantavirus infection in pregnant women,this study will focus on the epidemiological distribution of the virus,different virus species penetrating the placental barrier,and factors affecting the incidence and clinical outcome of the infection in pregnant women and their *** addition,this review will also discuss the diagnostic tools and treatments for pregnant patients and provide an overview of the relevant future research.

关键词： Hantavirus Pregnancy Hantaan virus(HTNV) HPS HFRS

Effects of initial grain size and strain on grain boundary engineering of high-nitrogen CrMn austenitic stainless steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2018年第8期25卷 922-929页

作者： Zhen-hua Wang jian-jun qi Wan-tang Fu School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China HBIS Group Technology Research Institute Shijiazhuang 050023China

18 Mn18 Cr0.5 N steel with an initial grain size of 28–177 μm was processed by 2.5%–20% cold rolling and annealing at 1000°C for 24 h,and the grain boundary character distribution was examined via electron backscatter *** strain(2.5%) favored the formation of low-Σ *** this strain,the fraction of low-Σ boundaries was insensitive to the initial grain ***,specimens with fine initial grains showed decreasing grain size after grain boundary engineering *** fraction of low-Σ boundaries and the(Σ9 + Σ27)/Σ3 value decreased with increasing strain; furthermore,the specimens with fine initial grain size were sensitive to the ***,the effects of the initial grain size and strain on the grain boundary engineering were discussed in detail.

关键词： grain boundary engineering grain boundary character distribution grain size strain austenitic stainless steel

Probability Prediction Model for Landslide Occurrences in Xi'an, Shaanxi Province, China

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2014年第2期11卷 345-359页

作者： ZHUANG jian-qi IQBAL Javed PENG jian-bing LIU Tie-ming College of Geological Engineering and Surveying of Changan University/Key Laboratory of Western China Mineral Resources and Geological Engineering Department of Earth Sciences COMSATS Institute of Information Technology Institute of Geology and Geophysics Chinese Academy of Sciences Geo-hazards Mitigation and Research of Chang'an University

Landslides are increasing since the 1980s in Xi'an, Shaanxi Province, China. This is due to the increase of the frequency and intensity of precipitation caused by complex geological structures, the presence of steep landforms, seasonal heavy rainfall, and the intensifcation of human activities. In this study, we propose a landslide prediction model based on the analysis of intraday rainfall(IR) and antecedent effective rainfall(AER). Primarily, the number of days and degressive index of the antecedent effective rainfall which affected landslide occurrences in the areas around qin Mountains, Li Mountains and Loess Tableland was established. Secondly, the antecedent effective rainfall and intraday rainfall were calculated from weather data which were used to construct critical thresholds for the 10%, 50% and 90% probabilities for future landslide occurrences in qin Mountain, Li Mountain and Loess Tableland. Finally, the regions corresponding to different warning levels were identified based on the relationship between precipitation and the threshold, that is; "A" region is safe, "B" region is on watch alert, "C" region is on warning alert and "D" region is on severe warning alert. Using this model, a warning program is proposed which can predict rainfall-induced landslides by means of real-time rain gauge data and real-time geo-hazard alert and disaster response programs. Sixteen rain gauges were installed in the Xi'an region by keeping in accordance with the regional geology and landslide risks. Based on the data from gauges, this model accurately achieves the objectives of conducting real-time monitoring as well as providing early warnings of landslides in the Xi'an region.

关键词： Landslide Probability prediction model Real-time monitoring Xi'an

Systematic review and Meta-analysis of treating open angle glaucoma with gonioscopy-assisted transluminal trabeculotomy

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2020年第2期13卷 317-324页

作者： Chun-Yan Guo Xiao-Hui qi jian-Ming qi People’s Hospital of Dingxi Dingxi 743000Gansu ProvinceChina

●AIM:To systematically review and Meta-analyze studies of managing open angle glaucoma(OAG)with gonioscopyassisted transluminal trabeculotomy(GATT)and to evaluate its effectiveness and safety.●METHODS:Eligible studies were retrieved and screened from five main electronic *** difference(MD)was hired to show the pooled effectiveness of intraocular pressure(IOP)and medication decrease achieved by *** addition,combined surgical success and reoperation rates were calculated,and complications were also summarized.●RESULTS:Ten studies were included for systematic review,but one study was not pooled for Meta-analysis due to the repeated *** combined IOP decrease after GATT was 9.81 mm Hg(95%CI:7.98-11.63 mm Hg)which showed significant reduction from the baselines(Z=10.52,P<0.0001).Similarly,the number of medications after GATT also decreased distinctly compared with that of medication before the surgery(Z=9.09,P<0.0001),and the pooled medication decrease was 1.68(95%CI:1.31-2.04).In addition,the combined surgical success rate was 85%,while the pooled reoperation rate was 20%.Sightthreatening complications occurred scarcely,whereas the pooled occurrence rate of hyphemia was as high as 36.0%.●CONCLUSION:GATT could effectively lower IOP and decrease medications for patients with ***,the procedure appears to be a safe and promising treatment for OAG due to its minimally-invasive and conjunctiva-sparing nature.

关键词： gonioscopy-assisted transluminal trabeculotomy open angle glaucoma intraocular pressure complication Meta-analysis