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Research on windmill starting characteristics of MTE-d micro turbine engine

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Chinese Journal of Aeronautics 2013年第4期26卷 858-867页

作者： Xia Chen fu Xin Wan Zhaoyun Huang Guoping Chen Jie College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics

Micro turbine engine （MTE） is an important kind of propulsion system for miniature unmanned aircraft or missiles, because of its better high-speed performance （than propeller propulsion） and higher propulsion efficiency （obviously than rockets）. Windmill start is a common air-starting mode used in micro turbine engine. The windmill starting characteristics are important to the practical use of micro turbine engine. In this paper, the windmill starting characteristics research for a 12 cm diameter （MTE-d） micro turbine engine is carried out by experiment and numerical simulation. The characteristic of rotor mechanical losses at low-speed condition is stud- ied, and the engine common working line of windmill starting process is obtained. Based on the engine windmill characteristics, the propane ignition characteristics under different inflow conditions are researched, and the envelope of propane ignition and propane flameout is determined. The experimental research of fuel supply and ignition characteristics is completed, and the envelope of fuel supply and ignition is obtained. The windmill stage, propane ignition stage, fuel ignition stage and acceleration process from idling-speed to 80% full speed of MTE-d micro turbine engine is optimized, and the optimization windmill starting parameters are collected. The successful wind-mill starting experiment under this condition with engine speed up to 80% full speed indicates that these starting parameters are reasonable. All the starting parameters of MTE-d micro turbine engine obtained in this work are dimensionless parameters, and the conclusions obtained in this study have some reference to other micro turbine engines with the similar structural form and starting process.

关键词： Flameout boundary Ignition characteristics Low speed characteristics Micro turbine engine Windmill starting

Mechanistic insights into the novel glucose-sensitive behavior of P(NIPAM-co-2-AAPBA)

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Science China Chemistry 2020年第3期63卷 377-385页

作者： Qingxian Wang Mian fu Ying Guan Tony d.James Yongjun Zhang Key Laboratory of functional Polymer Materials and State Key Laboratory of Medicinal Chemical Biology Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China department of Chemistry University of BathClaverton DownBath BA27AYUK

A glucose-sensitive polymer,poly(N-isopropylacrylamide-co-2-acrylamidophenylboronic acid)(P(NIPAM-co-2-AAPBA)),was synthesized by reversible addition fragmentation chain transfer(RAFT)*** of glucose results in reduced solubility and hence increased turbidity,rather than the normal increase in solubility(decreased turbidity)observed for other PBA-based glucose-sensitive *** novel glucose-sensitive behavior is explained by a new mechanism,in which glucose acts as an additive and depresses the lower critical solution temperature(LCST)of the polymer,instead of increasing solubility by increasing the degree of ionization of the PBA *** and theoretic analysis for the influence of glucose on the thermal behavior of P(NIPAM-co-2-AAPBA)reveals that glucose depresses the LCST of P(NIPAM-co-2-AAPBA)copolymers in a two-stage manner,a fast decrease at low glucose concentrations followed by a slow decrease at high glucose *** low glucose concentrations,the binding of glucose with PBA groups on the polymer chain increases the number of glucose molecules proximal to the polymer which influences the thermal behavior of the polymer,causing a rapid decrease in ***,the transition occurs at a glucose concentration equal to the reciprocal of the binding constant between PBA and glucose,thus providing a novel method to determine the binding *** saccharides,including mannose,galactose and fructose,also depress the LCST of P(NIPAM-co-2-AAPBA)copolymer in the same way.

关键词： glucose-sensitive mechanism phenylboronic acid thermosensitive binding constant lower critical solution temperature polymers

Vertical 3d Printed Pd/TiO_(2) Arrays for High Efficiency Photo-assisted Catalytic Water Treatment

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Chemical Research in Chinese Universities 2023年第6期39卷 891-901页

作者： fu Chenhao LI dan ZHANG Jianwei GUO Wei YANG He ZHAO Bo CHEN Zhaomin fu Xin LIANG Zhiqiang JIANG Lin Institute of functional Nano and Soft Materials Laboratory(fuNSOM)and Jiangsu Key Laboratory for Carbon-Based.functional Materials and devices Soochow UniversitySuzhou 215123P.R.China Shanghai Institute of Satellite Engineering Shanghai 200240P.R.China

Catalytic degradation of organic contaminants is at the frontier of water treatment due to its selectivity,energy savings,and ability to convert harmful contaminants into harmless or even valuable chemical products for ***,achieving sufficiently high performance in the catalytic removal of organic contaminants for practical application is still extremely ***,we report a Pd-decorated TiO_(2)(Pd/TiO_(2))hierarchical vertical array for fast and efficient catalytic water *** a forest-like Pd/TiO_(2) vertical array demonstrates the following distinct advantages over conventional planar or bulk catalytic systems:1)abundant anchoring sites for nanocrystals loading;2)high sunlight absorption;3)efficient mass transfer channels for the reactants and *** a proof of concept,the Pd/TiO_(2) array demonstrated rapid and efficient photo-assisted catalytic reduction of high concentrations of 4-nitrophenol wastewater(2 g/L,ca.14.38 mmol/L)and its feasibility for continuous flow wastewater *** turnover frequency(TOF)value of the Pd/TiO_(2) array was up to 8.00 min^(-1),which was approximately 4.2 times that of planar Pd/TiO_(2) film with the same area(1.91 min^(-1)).Our strategy of incorporating nanocatalysts with a hierarchical vertical array provides a promising approach to boosting the catalytic performance of catalysts for different chemical reactions.

关键词： 3d printing TiO_(2) Hierarchical vertical array Catalytic water treatment 4-Nitrophenol

Specificity-preserving RGB-d saliency detection

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Computational Visual Media 2023年第2期9卷 297-317页

作者： Tao Zhou deng-Ping Fan Geng Chen Yi Zhou Huazhu fu School of Computer Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China Key Laboratory of System Control and Information Processing Ministry of EducationShanghaiChina Computer Vision Lab ETH Z¨urichZ¨urichSwitzerland School of Computer Science and Engineering Northwestern Polytechnical UniversityXi’anChina School of Computer Science and Engineering Southeast UniversityNanjingChina Inception Institute of Artificial Intelligence Abu DhabiUnited Arab Emirates

Salient object detection(SOd)in RGB and depth images has attracted increasing research *** RGB-d SOd models usually adopt fusion strategies to learn a shared representation from RGB and depth modalities,while few methods explicitly consider how to preserve modality-specific *** this study,we propose a novel framework,the specificity-preserving network(SPNet),which improves SOd performance by exploring both the shared information and modality-specific ***,we use two modality-specific networks and a shared learning network to generate individual and shared saliency prediction *** effectively fuse cross-modal features in the shared learning network,we propose a cross-enhanced integration module(CIM)and propagate the fused feature to the next layer to integrate cross-level ***,to capture rich complementary multi-modal information to boost SOd performance,we use a multi-modal feature aggregation(MFA)module to integrate the modalityspecific features from each individual decoder into the shared *** using skip connections between encoder and decoder layers,hierarchical features can be fully *** experiments demonstrate that our SPNet outperforms cutting-edge approaches on six popular RGB-d SOd and three camouflaged object detection *** project is publicly available at https://***/taozh2017/SPNet.

关键词： salient object detection(SOd) RGB-d cross-enhanced integration module(CIM) multi-modal feature aggregation(MFA)

Construction of Toxicology CRO Platform for New Product R & d

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毒理学杂志 2005年第A3期19卷 244-245页

作者： Lijie fu Next Century Incorporated USA 19711

As the race to develop innovative medicine gets tougher, the demand for contract research is reaching an alltime high. In 2001, the revenue for the worldwide contract research organization (CRO) market was $ 9.8 billi... 详细信息

关键词：毒理学 CRO 药物研究代谢产物

8周运动预适应增强脂肪干细胞治疗心肌梗死大鼠的效果

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中国组织工程研究 2025年第7期29卷 1363-1370页

作者：娄国张敏付常喜江苏经贸职业技术学院江苏省南京市211168 南京旅游职业学院江苏省南京市211100 徐州工程学院体育学院江苏省徐州市221008

背景:干细胞移植是心肌梗死的崭新疗法,然而梗死区域极其恶劣的微环境造成干细胞存活率低下并导致远期疗效甚微。运动预适应是一种通过运动诱导机体产生内源性保护效应的方式,可作为心脏康复预防与治疗的新策略。目的:评估运动预适应是... 详细信息

背景:干细胞移植是心肌梗死的崭新疗法,然而梗死区域极其恶劣的微环境造成干细胞存活率低下并导致远期疗效甚微。运动预适应是一种通过运动诱导机体产生内源性保护效应的方式,可作为心脏康复预防与治疗的新策略。目的:评估运动预适应是否能够增强大鼠心肌梗死后脂肪干细胞移植的心脏保护效应,探讨血管生成在其中的作用机制。方法:6周龄雄性Sd大鼠随机分为对照组、造模组、干细胞组以及干细胞运动组。利用冠状动脉闭塞术制作急性心肌梗死模型,对照组同期行假手术;干细胞运动组于造模前进行8周有氧运动,造模后30 min进行脂肪干细胞移植;干细胞组仅进行脂肪干细胞移植。干细胞移植后1 d和7 d,利用免疫印迹法测定心肌总Akt(t-Akt)、磷酸化Akt(p-Akt)、血管内皮生长因子(VEGF)、总内皮型一氧化氮合酶(t-eNOS)和磷酸化内皮型一氧化氮合酶(p-eNOS)蛋白表达量,计算p-Akt/t-Akt和p-eNOS/t-eNOS比值;4周后利用彩色多普勒超声诊断系统检测心脏结构与功能以及心肌血流量,TTC染色法检测心肌梗死面积,Masson染色法检测心肌间质胶原沉积,免疫荧光染色法测定心肌毛细血管密度,TUNEL染色法评估心肌细胞凋亡。结果与结论:(1)干细胞移植后4周:与对照组比较,造模组左心室缩短分数、左心室射血分数、心肌毛细血管密度和心肌血流量下降(Pd:与对照组比较,造模组t-Akt、p-Akt、VEGF、t-eNOS、p-eNOS蛋白表达量以及p-Akt/t-Akt、p-eNOS/t-eNOS比值均无显著性变化(P>0.05);与造模组比较,干细胞组上述指标均无显著性变化(P>0.05),干细胞运动组磷酸化p-Akt蛋白表达量以及p-Akt/t-Akt比值上调(Pd:与对照组比较,造模组p-Akt、VEGF、p-eNOS蛋白表达量以及p-Akt/t-Akt、p-eNOS/t-eNOS比值下降(P0.05),干细胞运动组p-Akt、VEGF、p-eNOS蛋白表达量以及p-Akt/t-Akt、p-eNOS/t-eNOS比值升高(P<0.05)。结果表明:运动预适应可增强脂肪干细胞对心肌梗死大鼠心脏重塑的治疗效果,其机制与促进心肌血管生成并增加血流灌注有关。

关键词：干细胞脂肪干细胞运动预适应心肌梗死血管生成心脏重塑血流灌注

Why choose 3d bioprinting? Part I: a brief introduction of 3d bioprinting for the beginners

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Bio-design and Manufacturing 2019年第4期2卷 221-224页

作者： Yong He Mingjun Xie Qing Gao Jianzhong fu State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China

Graphic abstract Concept of 3d bioprinting 3d printing,also called additive manufacturing,is a layerby-layer manufacturing method,and it has been implemented in a wide variety of areas.3d printing could be treated as the reverse process of potato cutting,automatically assembling the chips or slicing into a potato[1].When this simple idea is met with biomedical engineering,3d bioprinting is born.

关键词： printing additive potato

Nest predators, nest-site selection and nest success of the Emei Shan Liocichla(Liocichla omeiensis), a vulnerable babbler endemic to southwestern China

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Chinese Birds 2016年第3期7卷 161-166页

作者： Yiqiang fu Benping Chen Simon d.dowell Zhengwang Zhang Sichuan Institute Key Laboratory for Protecting Endangered Birds in the Southwest Mountains College of Life Sciences Leshan Normal University Laojunshan National Nature Reserve Administration North of England Zoological Society Chester Zoo Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering College of Life Sciences Beijing Normal University

Background: The Emei Shan Liocichla(Liocichla omeiensis) is a globally vulnerable babbler, endemic to southwestern China. We investigated its nest predators, nest-site selection and nest success at the Laojunshan National Nature Reserve in Sichuan, China in order to identify the precise nesting-habitat requirements of the species, and to test whether the nest-site-selection cues, preferred by the Emei Shan Liocichla, are positively associated with nest ***: We used infrared cameras to determine nest predators. We compared the microhabitat attributes between nest and random sites, as well as successful and failed nests. We used Binary Logistic Regression to determine the most important variables affecting nest-site selection of the Emei Shan Liocichla. We used the nest survival analysis in Program MARK to estimate daily nest survival rates(dSR). Nest success was calculated using the Mayfield ***: In total 56 nests were found. The dSR for all nests that contained at least one egg was 0.9564 ± 0.0091(95 % CI 0.9346–0.9711)(n = 40), while the total nest success was 27.5 %. We identified four categories of predators in 10 nest predation events, i.e. squirrels(n = 5), snakes(n = 3), raptors(n = 1) and wasps(n = 1). We found that:(1) nest predation was the primary reason for nest failure of the Emei Shan Liocichla,(2) tree cover, bamboo cover, liana abundance and distance to forest edge or gap were the most important variables affecting nest-site selection of this species, and(3) the nest-site-selection variables we measured appeared not to be positively associated with nest ***: Our findings suggest that the Emei Shan Liocichla tended to select nest sites near forest edges or gaps with good concealment and that nest-site selection by this species was nonrandom but not necessarily adaptive. Reducing forest-edge development and protecting bamboo stands should be effective for conservation of this species.

关键词： Nest predator Nest-site selection Nest success Liocichla omeiensis Laojunshan Nature Reserve

Computing parallel/coincident phase d-brane superpotentials and Type-Ⅱ/F-theory duality

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Chinese Physics C 2018年第9期42卷 37-46页

作者： Xiao-Tian Jiang fu Zhong Yang University of Chinese Academy of Sciences Beijing 100049China

In this paper we study the parallel phase and the coincident phase of d-brane systems with the compactification of one closed modulus. d-brane systems with two phases are described by different 4-folds in terms of Type-Ⅱ/F-theory duality, and the phase transitions are related by the blow-up from a 4-fold with singularities to a 4-fold without. In terms of gauge theory, the phase transition corresponds to the enhancement of gauge group U（1）×U（1）→U（2） connecting the Coulomb branch and the Higgs branch. For the sextic and octic with two d-branes,using mirror symmetry and Type-Ⅱ/F theory duality, A-model superpotentials are obtained from the B-model side for the two phases, and the U（1） Ooguri-Vafa invariants for the parallel phase and U（2） Ooguri-Vafa invariants for the coincident phase are extracted from the A-model superpotential. The difference between the invariants of the two phases is evidence of the phase transition between the Coulomb branch and the Higgs branch.

关键词： Ooguri-Vafa invariants TypeⅡ/F-theory duality phase transition