检索结果-南通市图书馆

New Isophlebioid Dragonflies from the Middle Jurassic of Inner Mongolia,China(Insecta:Odonata:Isophlebioptera:Campterophiebiidae)

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2008年第6期82卷 1104-1114页

作者： ZHANG Binglan ren dong PANG Hong College of Life Sciences Capital Normal University Beijing 100037 State Key Laboratory of Biocontrol and Institute of Entomology Sun Yat-sen University Guangzhou Guangdong 510275

Three new species of fossil dragonflies assigned to Sinokaratawia Nel, Huang and Lin in family Campterophlebiidae, i.e.S, daohugouica sp. nov., S. magica sp. nov. and S. gloriosa sp. nov., and new materials of male S. prokopi Nel, Huang and Lin, 2007 are described from the Middle Jurassic of Daohugou, Inner Mongolia, China. An emended diagnosis of genus Sinokaratawia was proposed.

关键词： Odonata Campterophlebiidae new species Middle Jurassic Inner Mongolia China

Lichtenstein术与Rutkow术治疗腹股沟疝的疗效比较

在线全文

学校读者我要写书评

暂无评论

蚌埠医学院学报 2016年第8期41卷 1032-1034页

作者：聂鲁愚尚广东冯万东任伍保周新华安徽省马鞍山十七冶医院普外科 243000

目的:比较平片式无张力疝修补术(Lichtenstein术)和网塞充填式无张力疝修补术(Rutkow术)治疗腹股沟疝的临床疗效。方法:采用回顾性研究的方法,搜集2011年6月至2014年12月行单侧开放性无张力腹股沟疝修补术并获得随访的患者共111例,根据... 详细信息

目的:比较平片式无张力疝修补术(Lichtenstein术)和网塞充填式无张力疝修补术(Rutkow术)治疗腹股沟疝的临床疗效。方法:采用回顾性研究的方法,搜集2011年6月至2014年12月行单侧开放性无张力腹股沟疝修补术并获得随访的患者共111例,根据手术方式分为Lichtenstein术组和Rutkow术组,比较2组的临床疗效。结果:2组患者术前一般情况、合并症、疝类型、疝分型、手术时间、术后下床时间、是否需镇痛、术后恢复时间、阴囊肿胀、手术部位感染、复发等差异均无统计学意义(P>0.05)。Lichtenstein术组术后3个月疼痛视觉模拟评分及异物感均低于Rutkow术组(P<0.05和P<0.01)。结论:Lichtenstein术费用低、术后异物感轻、慢性疼痛发生率低,且在复发率、并发症、术后恢复情况方面与Rutkow组无显著差异,可以作为基层医院腹股沟疝的首选术式。

关键词：疝,腹股沟 Lichtenstein术 Rutkow术

Elimination of grapevine fleck virus and grapevine rupestris stem pitting-associated virus from Vitis vinifera 87-1 by ribavirin combined with thermotherapy

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2021年第9期20卷 2463-2470页

作者： HU Guo-jun dong Ya-feng ZHANG Zun-ping FAN Xu-dong ren Fan Research Institute of Pomology Chinese Academy of Agricultural SciencesXingcheng 125100P.R.China

Vitis vinifera 87-1 plants infected by grapevine fleck virus(GFkV) and grapevine rupestris stem pitting-associated virus(GRSPaV) were used as the plant materials for virus elimination treatment. This study evaluated the effects of ribavirin at different concentrations(15 and 25 μg mL^(–1);R15 and R25, respectively), thermotherapy(37°C;T), and the combination of ribavirin and thermotherapy(R15+T and R25+T) on eliminating viruses from grapevine plants in vitro. Both R15 and R25 had phytotoxic effects and weakened plant growth. Thermotherapy positively affected the growth of grapevine plants. Plant height was significantly greater in T, R15+T, and R25+T than in CK, R15 and R25. The proportion of dead plants after T, R15+T, and R25+T was 51.4, 11.4, and 8.6%, respectively. The survival rates of regenerated plants after all treatments were >68.0%. Ribavirin concentration and treatment time were related to the regeneration of shoot tips and elimination efficiencies of the two viruses. The survival rates of plants after R15+T for 30, 40, and 50 days were 97.3, 90.7, and 74.4%, respectively. The elimination rates of GRSPaV from plants in the three time quantum were 55.6, 84.6, and 93.8%, respectively. The elimination rate of GFkV was 23.9% higher in R25(35/44) than in R15(25/45), and that of GRSPaV was 7.0% higher in R25 than in R15. The combination of thermotherapy and chemotherapy was found to have a positive effect on the eradication of GFkV and GRSPaV, and R25+T for 50 days was able to completely eliminate the two viruses from in vitro grapevines.

关键词： in vitro grapevine grapevine fleck virus(GFk V) grapevine rupestris stem pitting-associated virus(GRSPaV) chemotherapy thermotherapy virus elimination

Effect of electroacupuncture on glial fibrillary acidic protein and nerve growth factor in the hippocampus of rats with hyperlipidemia and middle cerebral artery thrombus

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2021年第1期16卷 137-142页

作者： Na-Ying Xue dong-Yu Ge Rui-Juan dong Hyung-Hwan Kim Xiu-Jun ren Ya Tu School of Acupuncture-Moxibustion and Tuina Beijing University of Chinese MedicineBeijingChina School of Traditional Chinese Medicine Beijing University of Chinese MedicineBeijingChina Neurovascular Research Laboratory Department of RadiologyMassachusetts General Hospital and Harvard Medical SchoolCharlestownMAUSA

Electroacupuncture(EA)has been shown to reduce blood lipid level and improve cerebral ischemia in rats with hyperlipemia complicated by cerebral ***,there are few studies on the results and mechanism of the effect of EA in reducing blood lipid level or promoting neural repair after stroke in hyperlipidemic *** this study,EA was applied to a rat model of hyperlipidemia and middle cerebral artery thrombosis and the condition of neurons and astrocytes after hippocampal injury was *** for the normal group,rats in other groups were fed a high-fat diet throughout the whole *** models were established in rats fed a high-fat diet for 6 *** cerebral artery thrombus models were induced by pasting 50%FeCl3 filter paper on the left middle cerebral artery for 20 minutes on day 50 as the model ***1 group rats received EA at bilateral ST40(Fenglong)for 7 days before the *** in the EA1 and EA2 groups received EA at GV20(Baihui)and bilateral ST40 for 14 days after model *** health was assessed by hematoxylin-eosin staining in the *** was assessed by biochemical methods that measured total cholesterol,triglyceride,low-density lipoprotein and high-density lipoprotein in blood *** analysis was used to confirm the establishment of the *** methods were used to detect the expression of glial fibrillary acidic protein and nerve growth factor in the hippocampal CA1 *** results demonstrated that,compared with the model group,blood lipid levels significantly decreased,glial fibrillary acidic protein immunoreactivity was significantly weakened and nerve growth factor immunoreactivity was significantly enhanced in the EA1 and EA2 *** repair effect was superior in the EA1 group than in the EA2 *** findings confirm that EA can reduce blood lipid,inhibit glial fibrillary acidic protein expression and promote nerve growth factor

关键词： astrocytes CA1 cerebral ischemia electroacupuncture glial fibrillary acidic protein hematoxylin-eosin staining hippocampus hyperlipidemia immunohistochemistry nerve growth factor

Modeling pedestrian-vehicle interactions at unsignalized mid-block crosswalk under automated vehicle mixed traffic flow conditions: an agent-based approach

在线全文

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2025年

作者： Haojie Li Binyue Zhao Ziqian Zhang Yingheng Zhang Gang ren School of Transportation， Southeast University Jiangsu Key Laboratory of Urban ITS Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies

The introduction of automated vehicles (AVs) is expected to improve the safety and traffic efficiency of the transportation system. However， the impacts of AVs on pedestrian-vehicle interactions (PVIs) remain unclear， especially under the mixed traffic flow condition with AVs and conventional vehicles (CVs). The objective of this paper is to investigate PVIs under AV mixed traffic flow at unsignalized mid-block crosswalk (UMC) where the right of way competition exists and the traffic conditions are more complex. An agent-based simulation model is proposed to evaluate the safety and traffic efficiency under a diverse range of different scenarios. Some agents’ behavioral parameters are calibrated from trajectory and video data collected at two sites in Nanjing. The proposed model is also validated by comparing Post-Encroachment Time (PET) and pedestrian waiting time outputted from simulation with those extracted from empirical data. The simulation results suggest that the introduction of AVs has limited effect on both safety and efficiency levels at UMC under the low AV penetration rate. Compared to the negotiated yielding strategy of AVs， the conservative yielding strategy performs better in terms of pedestrian safety， but worse in improving traffic efficiency. Moreover， the results reveal that pedestrian and vehicle volumes， the proportion of pedestrians familiar with AVs， and the proportion of risk-prone pedestrians could significantly affect the safety and efficiency levels at UMC. Lastly， we provide some practical recommendations for determining treatments for mid-block crosswalks with AV mixed traffic flow to improve pedestrian safety and traffic efficiency.

关键词：

Preparation and study of novel mid-to-low-temperature phase-change molten salts

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Technological Sciences 2025年

作者： Chenxing ren Yifan WANG Xin HE Chenghang ZHENG Xiang GAO State Key Laboratory of Clean Energy Utilization Zhejiang University Institute of Carbon Neutrality Zhejiang University Baima Lake Laboratory Zhejiang University

Molten salts is a promising medium for heat storage and heat transfer due to their advantages of low cost, low steam pressure, high energy storage density and wide temperature range. In this paper, a new phase change mixture of molten salts with KNO3, NaNO3, ZnCl2, NaF, Na2CO3, NaCl, and MgO as materials has been prepared through a plenty of experiments. The experimental results show that the melting point of some molten salts can be reduced to 202.9°C, and the decomposition temperature can reach 701.3°C. In addition, its thermophysical properties, including specific heat, viscosity and thermal stability, were measured and analyzed. The average specific heat of some molten salts is as high as 2.53 J/（g K）, and the average thermal conductivity is as high as 0.77 W/（m K）. In the 4-day short-term thermal stability test, the fluctuation of each parameter is minimal, and the overall thermal physical property is relatively stable. Compared with the traditional phase change molten salt, the new hybrid molten salt has a significantly lower melting point, a further improvement in the decomposition temperature, specific heat and other comprehensive thermophysical properties, and a better overall economy, which has important application value in heat transfer and energy storage.

关键词：

Thermoresponsive helical dendronized poly(arylacetylene)s:modulating the dynamic chirality

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Xueting Lu Lei Wang Liangxuan ren Wen Li Afang Zhang International Joint Laboratory of Biomimetic&Smart Polymers School of Materials Science and EngineeringShanghai University

Helical poly(arylacetylene)s have formed an intriguing class of polymers,whose chiralities are dynamic and liable to external *** combining dendronized polymer topology with dendritic oligoethylene glycols (OEGs),we here report on synthesis of a homologous series of thermoresponsive dendronized poly(arylacetylene)s with either poly(phenyl acetylene) or poly(naphthalene acetylene) as the backbones,and investigate tunability of their helical *** polymers carry dendritic OEG pendants with either methoxyl-or ethoxyl-terminals to tune their unprecedent thermoresponsive behaviors,and at the same time,dendritic shielding plays an important role in mediating their thermal phase transition *** of these polymers is originated from the chiral alanine or phenylalanine moieties within the dendritic pendants,which can be tailored through manipulating solvation in different organic solvents or via thermal dehydration and collapse in ***,achiral additives such as linear or dendritic OEGs and benzene derivatives can act similarly as thermal dehydration to induce chirality transitions of these polymers in aqueous phase through interplay competitions between the additives and the polymers against their hydration.

关键词：

In-Situ Annealing Study of Transformation of α and γ Texture of Interstitial-Free Steel Sheet by High-Energy X-Ray Diffraction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2013年第5期20卷 38-41页

作者： LIU Yan-dong ZHANG Yu-dong ren Yang Albert Tidu ZUO Liang Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education Northeastern University LETAM/ISGMP CNRS X-Ray Science Division Argonne National Laboratory

High-energy synchrotron diffraction offers great potential for experimental study of recrystallization kinetics. An experimental design to study the recrystallization mechanism of interstitial-free （IF） steel was implemented. The whole annealing process of cold-rolled IF steel with 80% reduction was observed in situ using high-energy X-ray diffraction （HEXRD）. The results show how the main texture component of IF steel change, i.e. the α [∥rolling direction （RD）] fiber texture decreases and the γ [∥normal direction （ND）] fiber texture increases. The important part of the α fiber texture is that both the {100} and {112} texture decrease at the beginning of recrystallization. The γ fiber texture increases at the early stage of recrystallization which stems from the increase of {111}. Nevertheless, the {111} does not change after recrystallization. The dynamic evolution of the main texture components {100}, {112}, {111} and {111} is given by in-situ HEXRD.

关键词： IF steel texture recrystallization high-energy X-ray diffraction Debye-Scherrer ring

Experimental research and numerical simulation of RC beams strengthened with bonded steel plates

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2012年第12期55卷 3270-3277页

作者： LEI dong CHEN GuangYuan CHEN YuQuan ren QingWen State Key Laboratory of Hydrology-Water Rexources and Hydraulic Engineering Hohai UniversityNanjing 210098China College of Mechanics and Materials Hohai UniversityNanjing 210098China

It is a common method to strengthen the damaged RC structures with bonded steel plates. At present the ultimate bearing ca- pacity of RC structures strengthened with bonded steel plates is calculated mostly using the theory based on the test. Four beams, including one reference beam, two strengthened concrete beams in primary force and secondary force respectively, and one strengthened concrete beam which was not anchored enough, were tested under four-point bending (4PB) in order to get the data of strain of longitudinal bars, bonded bottom steel plate in tension and deflection of beams in the middle span. The experimental program was supported by a three-dimensioned finite analysis using ABAQUS. At the end of experiments and finite analysis, it is concluded that the investing strengthening technique can significantly improve the load-carrying capacity and the phenomenon of stress concentration at the end of interface, as well as the damage at interface, can be well simulated with cohesive element provided by ABAQUS.

关键词： RC beams, strengthened with bonded steel plates secondary force, finite element analysis, damage of interface