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Aerodynamic characteristics of co-flow jet wing with simple high-lift devices

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Chinese Journal of Aeronautics 2022年第10期35卷 67-83页

作者： Zhenhao ZHU Tianhang XIAO Haolin ZHI Shuanghou deng Yujin lu College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Numerical investigations are conducted to explore the aerodynamic characteristics of three-dimensional Co-Flow Jet(CFJ) wing with simple high-lift devices during low-speed takeoff and landing. Effects of three crucial parameters of CFJ wing, i.e., angle of attack, jet momentum and swept angle, are comprehensively examined. Additionally, the aerodynamic characteristics of two CFJ configurations, i.e., using open and discrete slots for injection, are compared. The results show that applying CFJ technique to a wing with simple high-lift device is able to generate more lift,reduce drag and enlarge stall margin with lower energy expenditure due to the super-circulation effect. Increasing the jet intensity can reduce the drag significantly, which is mainly contributed by the reaction jet force. The Oswald efficiency factor is, in some circumstances, larger than one,which indicates the potential of CFJ in reducing induced drag. Compared with clean wing configuration, using CFJ technique allows the aerodynamic force variation less sensitive to the swept angle, and such phenomenon is better observed for small swept angle region. Eventually, it is interesting to know that the discrete slotted CFJ configuration demonstrates a promising enhancement in aerodynamic performance in terms of high lift, low drag and efficiency.

关键词： Active flow control Co-flow jet Continuous injection Discrete injection slot Simple high-lift device

Aerodynamic performance enhancement of co-flow jet airfoil with simple high-lift device

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Chinese Journal of Aeronautics 2021年第9期34卷 143-155页

作者： Haolin ZHI Zhenhao ZHU Yujin lu Shuanghou deng Tianhang XIAO College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The present study performed a numerical investigation to explore the performance enhancement of a co-flow jet(CFJ)airfoil with simple high-lift device configuration,with a specific goal to examine the feasibility and capability of the proposed configuration for low-speed take-off and *** have been accomplished by an in-house-programmed Reynoldsaveraged Navier-Stokes solver enclosed by k-ωshear stress transport turbulence *** crucial geometric parameters,viz.,injection slot location,suction slot location and its angle were selected for the sake of revealing their effects on aerodynamic lift,drag,power consumption and equivalent lift-to-drag *** show that using simple high-lift devices on CFJ airfoil can significantly augment the aerodynamic associated lift and efficiency which evidences the feasibility of CFJ for short take-off and landing with small angle of *** injection and suction slot locations are more influential with respect to the aerodynamic performance of CFJ airfoil compared with the suction slot *** injection location is preferable to be located in the downstream of the pressure suction peak on leading edge to reduce the power expenditure of the pumping system for a relative higher equivalent lift-to-drag *** concluded criterion is that the suction slot should be oriented on the trailing edge flap for achieving more aerodynamic gain,meanwhile,carefully selecting this location is crucial in determining the aerodynamic enhancement of CFJ airfoil with deflected flaps.

关键词： Airfoil Co-flow jet Flow control Aerodynamic performance enhancement Simple high-lift device

Challenges and opportunities of using stereotactic body radiotherapy with anti-angiogenesis agents in tumor therapy

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Chinese Journal of Cancer Research 2018年第1期30卷 147-156页

作者： Xiaowen Sun Lei deng You lu Department of Thoracic Oncology Cancer Center and State Key Laboratory of Biotherapy West China Hospital Sichuan University

Microvessels promote proliferation of tumor cells by delivering oxygen and nutrients, but rapid growth of tumors results in unmet demands for oxygen and nutrients, thereby creating a hypoxia microenvironment. Under hypoxic conditions, vascular endothelial cells（ECs） initiate the formation of immature and abnormal microvasculature. This results in leakage and tortuosity that facilitates tumor cell invasion, metastasis and resistance to cytotoxic ***（RT） is a vital tumor treatment modality. Currently, more than 60% of patients with malignant tumors receive RT at certain points during their treatment. Hypoxia induced by abnormal microvessels can hamper the cytotoxic effect of ionizing radiation, particularly, stereotactic body radiotherapy（SBRT）. Anti-angiogenesis（AA） agents are known to reduce and renormalize microvessels in tumors, and hence alleviate hypoxia. The combination of AA agents with SBRT may have a synergistic role in inhibiting the growth of tumors. On the contrary, large doses of irradiation may affect tumor microvessels itself. In this review, we aim to clarify the relationship between SBRT and microvessel formation in tumors. In addition, we provide a retrospective analysis of the combination therapy involving SBRT and AA agents in preclinical and clinical practice to define its role in antitumor treatment.

关键词： Body radiotherapy stereotactic radiation effect microvessel agents anti-angiogenetic

Higher Order Triangular Mixed Finite Element Methods for Semilinear Quadratic Optimal Control Problems

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Numerical Mathematics(Theory,Methods and Applications) 2011年第2期4卷 180-196页

作者： Kang deng Yanping Chen Zuliang lu School of Mathematical Sciences Hunan University of Science and TechnologyXiangtan 411201P.R.China School of Mathematical Sciences South China Normal UniversityGuangzhou 510631P.R.China College of Mathematics and Computer Sciences Chongqing Three Gorges UniversityChongqing 404000P.R.China College of Civil Engineering and Mechanics Xiangtan UniversityXiangtan 411105P.R.China

In this paper,we investigate a priori error estimates for the quadratic optimal control problems governed by semilinear elliptic partial differential equations using higher order triangular mixed finite element *** state and the co-state are approximated by the order k Raviart-Thomas mixed finite element spaces and the control is approximated by piecewise polynomials of order k(k≥0).A priori error estimates for the mixed finite element approximation of semilinear control problems are ***,we present some numerical examples which confirm our theoretical results.

关键词： a priori error estimates semilinear optimal control problems higher order triangular elements mixed finite element methods

Why Terrestrial Stable Carbon-isotope Stratigraphy Works: a Review

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Acta Geologica Sinica(English Edition) 2014年第5期88卷 1603-1613页

作者： FANG Linhao lu Yuanzheng deng Shenghui State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Department of Earth Sciences University of Oxford Research Institute of Petroleum Exploration and Development Petro China

Carbon-isotope stratigraphy launched since the early technological development of carbon- isotope measurement in 1950s, however, the emergence and advance of terrestrial carbon-isotope stratigraphy took quite a long way. At early stage the exploration of carbon-isotope stratigraphy based on the marine biological shell carbonates was verified by repeatable carbon-isotope stratigraphic data, laboratory chemical experiments and the later laboratory foraminiferal culture experiments. The breakthrough for testifying the fundamentals of terrestrial carbon-isotope stratigraphy lies on the synchronous fluctuations between the carbon-isotope stratigraphic curves derived from marine biological shell carbonates and those derived from terrestrial C3 plants. The character that carbon-isotope stratigraphic curves can be globally synchronously correlated over the marine and terrestrial/atmospheric reservoir mainly excludes the potential biasing factors, such as diagenetic bias, carbon-isotope variations in intra/inter individual plant in same species or between species, ecological changes, changes in aridity, changes in source input and representative sampling. Therefore, the fundamentals of terrestrial carbon-isotope stratigraphy based on C3 plant successfully established. The terrestrial carbon-isotope stratigraphy can be used for global stratigraphic correlation, reconstructing the evolution of atmospheric CO2 and can further verify the published global carbon-cycle models. The terrestrial carbon-isotope stratigraphy based on the compound specific biomarkers and single-grained pollen may be a promising perspective in future.

关键词： terrestrial stratigraphic correlation carbon-isotope stratigraphy diagenesis carbon cycles

Effect of frugivorous birds on the establishment of a naturally regenerating population of Chinese yew in ex situ conservation

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Integrative Zoology 2008年第3期3卷 186-193页

作者： Changhu lu Qiongqiong ZHU Qingshan deng College of Forestry Resource and Environment Nanjing Forestry UniversityNanjing 210037China

The Chinese yew Taxus chinensis is catalogued as an endangered species in China because of the small size andsenescent status of most populations. Its lack of natural regeneration is the most important reason for its endangeredstatus. We investigated the regeneration of an ex-situ conservation population, which was introduced intothe Nanjing Botanical Garden Memorial Sun Yat-Sen in the 1950s, and evaluated the role of frugivorous birds on theestablishment of this regenerating population. Two hundred and thirteen individual yew seedlings and saplingswere found on the hillside in 2006, and the nearest seedling was found more than 10 m away from mother trees. Thespatial pattern of all seedlings and saplings occurred as a clumped distribution, which is typical for vertebratedispersedplants. Six bird species were seen ingesting whole “fruits” at yew trees in the present study and 745 visitsby avian frugivores were recorded. Red-billed blue magpie (Urocissa erythrorhyncha), Chinese bulbul (Pycnonotussinensis) and azure-winged magpie (Cyanopica cyana) were the most frequent visitors over the two years of thestudy. Comparing the flights of departure and perching habitats of the three main bird species, we inferred that *** would be the most important disperser. This regeneration population has had good developmentover the past 20 or more years;frugivorous birds have removed seeds to the hillside every year until now, and seedgermination and seedling growth continue to develop well under natural conditions. We suggest that the conservationsystem of the Chinese yew should be composed of yews, avian dispersers and habitats for seed germinationand seedling growth.

关键词： Chinese yew ex-situ conservation frugivorous birds natural regeneration Taxus chinensis

lutarjet-limit unique coracoid osteotomy Latarjet(With video)

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Burns & Trauma 2022年第1期10卷 504-512页

作者： Zhenhan deng Zeling Long Wei lu Department of Sports Medicine The First Affiliated Hospital of Shenzhen UniversityShenzhen Second People’s HospitalShenzhenGuangdong518035China

Background:The Latarjet procedure is an effective technique for the treatment of recurrent anterior shoulder dislocation with glenoid bone ***,the inevitable destruction of the coracoacromial arch may result in humeral head *** aim of the study is to introduce a modified Latarjet technique with coracoacromial arch preservation as well as its short term clinical ***:We propose a novel individualized flexible arthroscopic suture button fixation Latarjet technique called‘lutarjet’with *** measurements of the coracoid process,glenoid deficiency and osteotomy plane were made *** three arthroscopic portals were needed and limit unique coracoid osteotomy was performed with coracoacromial arch *** mini window splitting of the subscapularis was performed from the posterior to the anterior direction and the split window was as small as 8-10 mm in ***:A total of 27 patients(25.6±5.4 years)were included in the *** average surgical durationwas 55.6±6.3 min and the mean follow-up timewas 8.1±1.5 *** functional score was significantly improved at the last *** evidence showed that the bone graft healing was placed in the desired *** complications were ***:We present a fast,easy,accurate,safe arthroscopic‘lutarjet’technique called FEAST that can simplify the arthroscopic Latarjet process and achieve a satisfactory bone graft position and satisfactory short-term clinical *** of evidence:IV,case series.

关键词： Latarjet Recurrent anterior shoulder dislocation Glenoid bone loss Suture button fixation Coracoacromial archBackground

Synthesis of Highly Regioregular, Head-to-Tail Coupled Poly(3-octylesterthiophene) via C―H/C―H Coupling Polycondensation

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Chinese Journal of Polymer Science 2018年第9期36卷 1019-1026页

作者： Qiang Zhang Yue-Feng Li lu-Di deng Lin-Lin Zhao Chen-Xi Li Yan lu Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science & Engineering Tianjin University of Technology Key Laboratory of Functional Polymer Materials State Key Laboratory of Elemento-Organic Chemistry College of Chemistry Nankai University

Highly regioregular, head-to-tail coupled poly（3-octylesterthiophene） was synthesized by the Pd-catalysed oxidative C--H/C--H coupling polycondensation. The regioregularity of polymer products was confirmed by the 1H-NMR technique. Furthermore, the effects of various reaction factors including polymerization temperature, solvents and catalysts etc. on the yield, molecular weight and structural regioregularity of the resultant polymers were systematically studied. The optical, electrochemical and crystallization properties of the resultant P3OET with different HT regioregularities in solution and film state were studied by UV-Vis and fluorescent spectroscopy, cyclic voltammetry and X-ray diffraction （XRD）, resepectively.

关键词： C--H/C--H coupling polymerization Pd catalysed oxidative Poly(thiophene)s

Minimum distances of three families of low-density parity-check codes based on finite geometries

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Frontiers of Mathematics in China 2016年第2期11卷 279-289页

作者： Yanan FENG Shuo deng lu WANG Changli MA College of Mathematics and Information Science Hebei Normal University Shijiazhuang 050024 China School of Mathematics and Science Shijiazhuang University of Economics Shijiazhuang 050031 China Department of Mathematics and Computer Science Hengshui University Hengshui 053000 China

Three families of low-density parity-check （LDPC） codes are constructed based on the totally isotropic subspaces of symplectic, unitary, and orthogonal spaces over finite fields, respectively. The minimum distances ... 详细信息

关键词： low-density parity-check (LDPC) code minimum distance,symplectic unitary orthogonal