检索结果-南通市图书馆

Aerodynamic characteristics of a pitching airfoil with leading-edge morphing

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第7期37卷 81-92页

作者： Chaoyuan wen Yuting dai Yuntao XU Chao yang School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China Tianmushan Laboratory Hangzhou 311115China

This paper focuses on the effect of the phase offset of Leading-Edge(LE)morphing on the aerodynamic characteristics of a pitching NACA0012 *** an unstretched camber and using polynomial interpolation,an explicit expression for LE nonlinear morphing is proposed and implemented for the large pitching motion of the *** field results and aerodynamic forces are obtained by solving the unsteady Reynolds-averaged Navier-Stokes equations for both the airfoil’s pitching motion and LE ***,the index of instantaneous aerodynamic power is used to quantify the work done by the airflow in a dynamic *** to the instantaneous aerodynamic power and energy map,which denotes the energy transfer between the airfoil’s oscillation and flow field,the airfoil is subject to stall *** results show that LE morphing with an optimal phase offset of 315°reduces the energy extraction from the flow field,suppressing the stall flutter *** optimal phase offset is effective at different pitching axis positions of the *** results signify that LE morphing can suppress stall flutter by advancing the occurrence of the first LE vortex and increasing the nose-down moment during the upstroke period.

关键词： Aerodynamics Computational fluid dynamics Leading-edge morphing OpenFOAM Dynamic stall Dynamic mesh

Identification and characterization of toxins in the venom gland of the Chinese bird spider, Haplopelma hainanum, by transcriptomic analysis

在线全文

学校读者我要写书评

暂无评论

Insect Science 2016年第3期23卷 487-499页

作者： Ting-Cai Cheng Ren-wen Long Yu-Qian Wu You-Bing Guo Duo-Lian Liu Li Peng dai-Qin Li dai-wen yang Xin Xu Feng-Xiang Liu Qing-You Xia State Key Laboratory of Silkworm Genome Biology College of Biotechnology Southwest University Chongqing China Departmentof Biological Sciences National University of Singapore Singapore Singapore College of Life Sciences Hunan Normal UniversityChangsha China College of Life Sciences Hubei University Wuhan China

Tarantula venoms provide a model system for studying toxin selectivity, structure-activity relationships and molecular evolution ofpeptide toxins. Previous studies have identified a large number of peptide toxins in the venom of the Chinese bird spider Haplopelma hainanum, generally regarded as a highly venomous spider. However, the lack of available RNA-seq transcriptomic and genomic data is an obstacle to understanding its venom at the molecular level. In this study, we investigated the venom gland transcriptome of/-/, hainanum by RNA-seq, in the absence of an available genomic sequence. We identi- fied 201 potential toxins among 57 18 l de novo assembled transcripts, including knottins, Kunitz-type toxins, enzymes and other proteins. We systematically identified most of the knottins and Kunitz-type toxins, some of which showed strongly biased expression in the venom gland, including members of the huwentoxin-1, huwentoxin-2 and magi-1 families. We also discovered several novel potential toxins. These data demonstrate the high molec- ular and structural diversity in the venom toxins ofH. hainanum. This study offers a useful strategy for exploring the complex components of spider venoms.

关键词： diversity Haplopelma hainanum tarantula venom toxin transcriptome

Effects of Biostimulation-Bioaugmentation on Coastal Microbial Community in an in situ Mesocosm System

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 Ocean University of China 2024年第1期23卷 233-246页

作者： YUAN Fangzheng ZHAO yangyong dai Yulai yang wen ZHU Jinyong College of Marine Science Ningbo UniversityNingbo 315800China Zhejiang Easytest Environmental Technology Co. Ltd.Ningbo 315800China Hangzhou Academy of Agricultural Sciences Hangzhou 310024China

Globally,various types of pollution affect coastal waters as a result of human *** and biostimulation are effective methods for treating water ***,few studies have explored the response of coastal prokaryotic and eukaryotic communities to bioaugmentation and ***,a 28-day outdoor mesocosm experiment with two treatments(bioaugmentation-A and combined treatment of bioaugmentation and biostimulation-AS)and a control(untreated-C)were carried *** experiment was conducted in Meishan Bay to explore the composition,dynamics,and co-occurrence patterns of prokaryotic and eukaryotic communities in response to the A and AS using 16S rRNA and 18S rRNA gene amplicon *** treatment,Gammaproteobacteria and Epsilonproteobacteria were significantly increased in group AS compared to group C,while Flavobacteriia and Saprospirae were significantly *** was significantly reduced in AS compared to C,while Chrysophyta was significantly reduced in both AS and *** to C,the principal response curve analyses of the prokaryotic and eukaryotic communities both showed an increasing trend followed by a decreasing trend for ***,the trends of prokaryotic and eukaryotic communities in group A were similar to those in group AS compared with group C,but AS changed them more than A *** to the species weight table on principal response curves,a significant increase was observed in beneficial bacteria in prokaryotic communities,such as Rhodobacterales and Oceanospirillales,along with a decrease in autotrophs in eukaryotic communities,such as Chrysophyta and *** properties of network analysis reveal that A and AS complicate the interactions between the prokaryotic and eukaryotic ***,these findings expand our understanding of the response pattern of the bioaugmentation and biostimulation on coastal prokaryotic and eukaryotic communities.

关键词： prokaryotic community eukaryotic community bioaugmentation biostimulation coastal waters

State of the art of lightweight aggregates used in lightweight refractories for working lining of high-temperature furnaces

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第6期31卷 1320-1343页

作者： Wei Zhang wen-yong dai Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina Research and Development Department AGC Plibrico(Dalian)Industries Inc.Dalian 116600LiaoningChina

Lightweight refractories for the working lining of high-temperature furnaces play an important role in the smelting of advanced steels and *** prepare lightweight refractories for the working lining of high-temperature furnaces,the synthesis of lightweight aggregates is the ***,the research on the synthesis of lightweight aggregates with high service temperature,low thermal conductivity,high strength,and good slag resistance has received widespread *** available literature on the synthesis of lightweight aggregates was summarized,including corundum,mullite,mullite-corundum,spinel,corundum-spinel,cordierite,cordierite-mullite,calcium hexaluminate,corundum-calcium hexaluminate,bauxite,magnesia,magnesia-based,and forsterite-based ***,the future development trend of lightweight aggregates was proposed.

关键词： Lightweight aggregate Lightweight refractory Working lining Apparent porosity Closed porosity Thermal conductivity Pore-forming approach

Identification and immune analysis of antimicrobial peptides from the cigarette beetle(Lasioderma serricorne)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2024年第4期31卷 1121-1134页

作者： Yue Zhang Yi Yan Guy Smagghe Hong yang Ren-huai dai wen-jia yang Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region Institute of EntomologyGuizhou UniversityGuiyangChina Guizhou Provincial Key Laboratory for Rare Animal and Economic Insect of the Mountainous Region College of Biology and Environmental EngineeringGuiyang UniversityGuiyangChina

Antimicrobial peptides(AMPs)in insects are endogenous peptides that are effector components of the innate defense system of the *** may serve as antimicrobial agents because of their small molecular weight and broad-spectrum antimicrobial *** this study,we performed transcriptome analysis of cigarette beetle(Lasioderma serricorne)larvae,parasitized by the ectoparasitic wasp,Anisopteromalus *** AMP genes were significantly upregulated following *** parasitism,postulating the hypothesis that the parasitization enhanced the host's resistance against pathogenic microorganisms through the regulation of host AMP ***,3 AMP genes(LsDef1,LsDef2,and LsCole)were significantly upregulated and we studied their immune function in *** challenge and functional analysis showed that LsCole was responsible for the immune response against Gram-negative and Gram-positive bacteria,while LsDef1 and LsDef2 were involved in insect defense against Gram-positive *** recombinant LsCole exhibited antimicrobial activities against the Gram-negative bacterium Escherichia coli and the Gram-positive bacterium Staphylococcus ***2 showed an antibacterial effect against *** and LsDef2 exhibited antibiofilm activity against *** 2 AMPs disrupted cell membranes and caused leakage of *** cell *** results indicated that the 3 AMPs in *** are involved in the innate immunity of this pest *** AMPs may have potential as antimicrobial agents for bacterial infection ***,data are discussed in relation to new control strategies with greater biosafety against pest insects with use of microbial biocontrol agents in combination with RNA interference against the insect's defensive AMP genes.

关键词： antimicrobial activity antimicrobial peptides innate immune response Lasioderma serricorne RNA interference

Structure,bioavailability and physicochemical properties of icariin-soymilk nanoparticle

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第2期13卷 972-981页

作者： Jinping Wang Lingrong wen Yueming Jiang Hong Zhu Weizheng Sun Guangyi dai Bao yang Guangdong Provincial Key Laboratory of Applied Botany Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic ImprovementSouth China Botanical GardenChinese Academy of SciencesGuangzhou 510650China South China National Botanical Garden Guangzhou 510650China College of Food Science and Engineering Jilin Agricultural UniversityChangchun 130118China University of Chinese Academy of Sciences Beijing 100049China School of Food Sciences and Engineering South China University of TechnologyGuangzhou 510640China

Soymilk is a natural ***,the performance of flavonoid-soymilk nano-complex remains *** this work,icariin-soymilk nano-complexes(ISNCs)were successfully fabricated and *** effects of high-pressure homogenization(HPH)treatment on structure and physicochemical properties of soymilk and nano-complexes were *** treatment could significantly improve the surface hydrophobicity and interfacial activity of *** soymilk with HPH treatment could significantly improve the water solubility(20 folds),thermal stability and bioavailability of *** highest encapsulation efficiency(93.28%),loading capacity(39.09μg/mg),ζ-potentia(absolute value,31.20 mV)and bioavailability(72.14%)were observed in HSI-200(200 bar of homogenization pressure).While HSI-500(500 bar of homogenization pressure)showed the smallest particle size(183.73 nm).ISNCs showed a rougher surface and an irregular lamellar structure with large amount of fine particles by using Cryo-SEM,suggesting that icariin was encapsulated in *** data supplied a novel strategy to improve the performance of icariin in functional foods.

关键词： Encapsulation efficiency Flavonoid High pressure homogenization Loading capacity Nano-complex

The Influence of the Sun and Moon on the Observation of Very High Energy Gamma-ray Sources Using EAS Arrays

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第6期24卷 245-252页

作者： Tao wen Songzhan Chen Benzhong dai School of Physics and Astronomy Yunnan UniversityKunming 650091China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Tianfu Cosmic Ray Research Center Chengdu 610000China

With great advance of ground-based extensive air shower arrays,such as LHAASO and HAWC,many very high energy(VHE)gamma-ray sources have been discovered and are being monitored regardless of the day and the ***,the Sun and Moon would have some impacts on the observation of gamma-ray sources,which have not been taken into account in previous *** this paper,the influence of the Sun and Moon on the observation of very high energy gamma-ray sources when they are near the line of sight of the Sun or Moon is *** tracks of all the known VHE sources are scanned and several VHE sources are found to be very close to the line of sight of the Sun or Moon during some *** absorption of very high energy gamma rays by sunlight is estimated with detailed method and some useful conclusions are *** main influence is the block of the Sun and Moon on gamma rays and the shadow on the cosmic ray *** influence is investigated considering the detector angular resolution and some strategies on data analysis are proposed to avoid the underestimation of the gamma-ray emission.

关键词： astroparticle physics Sun:general methods:observational Sun:UV radiation

Study on a conical bearing for acceleration-sensitive equipment

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2024年第1期23卷 103-128页

作者： Pang Hui Xu wen dai Junwu Jiang Tao Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementHarbin 150080China School of Civil Engineering and Transportation Beihua UniversityJilin 132013China

Seismic isolation effectively reduces seismic demands on building structures by isolating the superstructure from ground vibrations during ***,isolation strategies give less attention to acceleration-sensitive systems or ***,as the isolation layer’s displacement grows,the stiffness and frequency of traditional rolling and sliding isolation bearings increases,potentially causing self-centering and resonance *** a result,a new conical pendulum bearing has been selected for acceleration-sensitive equipment to increase self-centering capacity,and additional viscous dampers are incorporated to enhance system ***,the theoretical formula for conical pendulum bearings is supplied to analyze the device’s dynamic parameters,and shake table experiments are used to determine the proposed device’s isolation efficiency under various *** to the test results,the newly proposed devices have remarkable isolation performance in terms of minimizing both acceleration and displacement ***,a numerical model of the isolation system is provided for further research,and the accuracy is demonstrated by the aforementioned experiments.

关键词： seismic isolation acceleration-sensitive equipment the conical pendulum bearing shake table tests isolation performance,numerical model

Epidemiology of congenital diaphragmatic hernia among 24 million Chinese births:a hospital-based surveillance study

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2024年第7期20卷 712-722页

作者： Zhi-Yu Chen Jing Tao wen-Li Xu Yu-yang Gao wen-Yan Li Zhen Liu Jia-Yuan Zhou Li dai National Center for Birth Defects Monitoring West China Second University HospitalSichuan UniversityNo.17 Section 3 RenminnanluChengdu 610041China The Joint Laboratory for Pulmonary Development and Related Diseases West China Institute of Women and Children’s HealthWest China Second University HospitalSichuan UniversityChengduChina Key Laboratory of Birth Defects and Related Diseases of Women and Children Ministry of EducationSichuan UniversityChengduChina NHC Key Laboratory of Chronobology Sichuan UniversityChengduChina Med‑X Center for Informatics Sichuan UniversityChengduChina

Background The prevalence of congenital diaphragmatic hernia(CDH)varies across countries,with limited information available on its epidemiology in *** study aimed to investigate the prevalence,time trends,and perinatal outcomes of CDH in China,as well as its associated malformations and potential associations with maternal and infant *** This study included all birth and CDH cases from the Chinese Birth Defects Monitoring Network between 2007 and 2019,with CDH cases classified as either isolated or *** employed the joinpoint regression model to calculate the trends of prevalence and the annual percent change,with Poisson regression used for adjusted prevalence rate ratios.A P value≤0.05 was considered statistically *** A total of 4397 CDH cases were identified among 24,158,029 births in the study period,yielding prevalence rates of 1.82,1.13 and 0.69 per 10,000 for overall,isolated,and associated CDH,*** prevalence of each type of CDH increased over *** prevalence of overall CDH varied significantly by infant sex(male ***,1.91/10,000 vs.1.63/10,000),maternal residence(urban ***,2.13/10,000 vs.1.45/10,000),maternal age(<20 years,1.31/10,000;20-24 years,1.63/10,000;25-29 years,1.80/10,000;30-34 years,1.87/10,000;≥35 years,2.22/10,000),and geographic region(central,1.64/10,000;east,2.45/10,000;west,1.37/10,000).Cardiovascular anomalies were the most common malformations associated with *** with associated CDH had a higher risk of premature birth and perinatal death than those with isolated *** The increasing prevalence and high perinatal mortality rate of CDH highlight the need for further etiological,epidemiological,and clinical studies among the Chinese population.

关键词： China Congenital diaphragmatic hernia Epidemiology Prevalence