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25th AIAA/CEAS Aeroacoustics Conference

作者： Ito, Yasushi Yokokawa, Yuzuru Takaishi, Takehisa Yamamoto, Kazuomi hirai, Tohru Ueno, Yosuke Isotani, Kazuhide Hayama, Kenji Shimada, Akihisa Kumada, Toshiyuki Hayashi, Kensuke Japan Aerosp Explorat Agcy Aeronaut Technol Directorate Mitaka Tokyo 1810015 Japan Ryoyu Syst Co Ltd Aerosp Engn Solut Div Minato Ku Nagoya Aichi 4550024 Japan Kawasaki Heavy Ind Co Ltd Dev Technol Dept Aerosp Syst Co Kakamigahara Gifu 5048710 Japan Sumitomo Precis Prod Co Ltd Engn & Dev Dept Aerosp Amagasaki Hyogo 6600891 Japan Mitsubishi Aircraft Corp Aircraft Integrat Dept Komaki Aichi 4800287 Japan

ISBN: (数字)9781624105883

ISBN: (纸本)9781624105883

To reduce noise from regional jet two-wheel main landing gear, a 10% scale wind tunnel model was fabricated and tested in a low-speed anechoic wind tunnel. Six types of noise reduction devices were prepared: a porous-plate cover around the tire axle and the lower half part of the strut, a plate between the mid door and strut, a plate on the side brace, wheel holes sealed with aluminum tape, a wind deflector and porous material with open cells affixed to the inner surfaces of the inboard gear door. In the wind tunnel test, significant noise reduction was achieved with the combination of the noise reduction devices except the wind deflector. Computational fluid dynamics simulations were also performed to see if they were able to predict the effect of the noise reduction devices with a reasonable amount of computational time, and to deepen understanding of their effect. Although the effect of the noise reduction in the computational result with the devices is smaller than the experimental result, their qualitative trends in the difference of the lowest noise configuration from the baseline configuration in sound pressure level and the polar directivity patterns at the mid-frequency range are similar.

关键词： Landing Gear Sound Pressure Level Wind Tunnel Models Computational Fluid Dynamics Simulation Porous Materials Flight Test Vehicle Japan Aerospace Exploration Agency Band Pass Filter Accelerating Flow Aircraft Noise

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Learning materials of natural science of characters-based problems on light and optical concept 4

Learning materials of natural science of characters-based pr...

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4th Annual Applied Science and Engineering Conference (AASEC)

作者： Tirmayasari, T. Jufri, A. W. Harjono, A. Univ Mataram Magister Program Sci Educ 62 Majapahit St Mataram Indonesia Univ Mataram Dept Biol 62 Majapahit St Mataram Indonesia Univ Mataram Dept Phys 62 Majapahit St Mataram Indonesia

Problem-based learning (PBL) is one of the recommended teaching materials model in the 2013 curriculum. The purpose of this research was to develop learning materials of natural science of characters-based problems on light and optical concept in junior high School four east Praya. research and development study refering to Dick & Carey model. Validaton by three experts (media, content, and language). The results of the first validation obtained an average of 3.6 and second validation obtained an average of 4.1, this indicates that learning materials are feasible and relevant to be used as learning resources for class VIII. The results of the reading level by Kincaid readability showed that out of 76 pages there were 40 pages of text that corresponded to the junior high school class VIII with a percentage of 52.6%, while the noncompliant text contained 36 pages with a percentage of 47%. The results of a limited trial showed that responses from students by 28% with categories quite interesting, 36% interesting, and 36% very interesting. In conclusion, learning materials of natural science of characters-based problems on light and optical concept was feasible to be applied in science learning processes.

关键词： Education computing

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Water incubation-induced fluctuating release of heavy metals in two smelter-contaminated soils

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Journal of Environmental Sciences 2019年第8期31卷 14-23页

作者： Bin Yang Yunzhe Cao Jie Ren Mei Wang Huilong Luo Fasheng Li College of Water Science Beijing Normal University State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences School of Ecology and Environment Inner Mongolia University

The soil moisture regime can affect the release of heavy metals in soil. In the previous studies, slightly polluted soils or artificially contaminated soil samples were considered to investigate the effect of soil moisture. We used highly smelter-contaminated and aged soils to study the release of typical heavy metals(Cu, Zn, Cd and Pb) induced by water incubation in batch experiments with characterization via speciation and X-ray diffraction analyses(XRD). The results show that the leachable concentrations of the heavy metals increased slightly in the first 30 days, decreased drastically between 30 and 90 days, and immobilized relatively constant thereafter. The fluctuation was ascribed to the changes of soil Eh and pH, the reductive dissolution of crystalline iron oxides, the formation of new amorphous iron oxides, the absorption of dissolved organic matter and the precipitation of metal sulfide. Speciation analysis indicated that a proportion of the soil heavy metals was transformed from an exchangeable fraction to a less labile fraction after water incubation. And the presence of a lead iron oxide phase and the peak increasing of zinc sulfide were observed via XRD analyses. Finally, water incubation restrained the release of heavy metals after 180 days of incubation, and reduced the leachability of Cu, Zn, Cd and Pb by as much as 1.61%–7.21% for soil A and 0.43%–3.36% for soil B, respectively. The study findings have implications for the formulation of risk control and management strategies for heavy metals in smelter-contaminated soils.

关键词： Smelter-contaminated soil Heavy metals Water incubation Release Fraction

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Towards Bimanual Vein Cannulation: Preliminary Study of a Bimanual Robotic System With a Dual Force Constraint Controller

Towards Bimanual Vein Cannulation: Preliminary Study of a Bi...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： He, Changyan Ebrahimi, Ali Yang, Emily Urias, Muller Yang, Yang Gehlbach, Peter Iordachita, Iulian Beihang Univ Sch Mech Engn & Automat Beijing 100191 Peoples R China Johns Hopkins Univ LCSR Baltimore MD 21218 USA Johns Hopkins Univ Hosp Wilmer Eye Inst Baltimore MD 21287 USA

ISBN: (纸本)9781728173955

Retinal vein cannulation is a promising approach for treating retinal vein occlusion that involves injecting medicine into the occluded vessel to dissolve the clot. The approach remains largely unexploited clinically due to surgeon limitations in detecting interaction forces between surgical tools and retinal tissue. In this paper, a dual force constraint controller for robot-assisted retinal surgery was presented to keep the tool-to-vessel forces and tool-to-sclera forces below prescribed thresholds. A cannulation tool and forceps with dual force-sensing capability were developed and used to measure force information fed into the robot controller, which was implemented on existing Steady Hand Eye Robot platforms. The robotic system facilitates retinal vein cannulation by allowing a user to grasp the target vessel with the forceps and then enter the vessel with the cannula. The system was evaluated on an eye phantom. The results showed that, while the eyeball was subjected to rotational disturbances, the proposed controller actuates the robotic manipulators to maintain the average tool-to-vessel force at 10.9 mN and 13.1 mN and the average tool-to-sclera force at 38.1 mN and 41.2 mN for the cannula and the forcpes, respectively. Such small tool-to-tissue forces are acceptable to avoid retinal tissue injury. Additionally, two clinicians participated in a preliminary user study of the bimanual cannulation demonstrating that the operation time and tool-to-tissue forces are significantly decreased when using the bimanual robotic system as compared to freehand performance.

关键词： Controllers

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Boundary Lubrication in Transient Elliptical Contact: Part 1-Theoretical Formulation and Results

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INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING 2019年第4期20卷 609-617页

作者： Xu, Di-Chu Zhang, Qi Wang, Jiu-Gen Zhejiang Univ Sch Mech Engn Hangzhou 310027 Zhejiang Peoples R China Shuanghuan Driveline Co Ltd Hangzhou 317600 Zhejiang Peoples R China

The transient elliptical contacts in boundary lubrication widely exist in modern mechanical systems with high durability. However, little attention has been paid to the squeeze effect of fluid film in this condition. A deterministic model which combines the contact mechanics with the pure squeeze lubrication model has been developed with the aim of understanding the squeeze effect of fluid film under the transient boundary lubrication. The leakage coefficient was introduced to capture the fluid leakage of rough surfaces. The squeeze effect of trapped fluid film was confirmed through comparing the fluid film stiffness in boundary lubrication with that of the elastohydrodynamic lubrication. Additionally, the effects of fluid film entrapment/leakage on the boundary lubrication performance were numerically analyzed during transients. The load capacity of the squeeze films is built up due to the trapped fluid film in the micro-valleys, which can be significantly affected by the interfacial shear coefficient of the boundary films. The simulation results show a good agreement with the experiments and justify the present numerical model is feasible in the boundary lubrication regime.

关键词： Boundary lubrication Squeeze film effect Junction growth Leakage

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A roadmap to a columnar visual cortical prosthetic

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CURRENT OPINION IN PHYSIOLOGY 2020年 16卷 68-78页

作者： Roe, Anna Wang Chen, Gang Xu, Augix Guohua Hu, Jiaming Zhejiang Univ Affiliated Hosp 2 Interdisci Plinary Inst Neurosci & Technol Sch MedDept Neurol Hangzhou Peoples R China Zhejiang Univ Minist Educ Key Lab Biomed Engn Hangzhou Zhejiang Peoples R China Oregon Hlth & Sci Univ Oregon Natl Primate Res Ctr Div Neurosci Beaverton OR 97239 USA

Visual blindness affects many millions globally and severely impacts quality of life. One approach to overcome visual blindness is the direct electrical microstimulation of brain circuits normally engaged in visual function. Attempts to do so with traditional brain-machine interfaces (BMI) in monkeys and humans have evoked percepts (phosphenes) described as crude featureless spots of light. Here, we propose to qualitatively enhance these percepts by recruiting submillimeter units of cortical representation (cortical columns) which encode rich visual features such as color, motion, shape, and faces. A three step roadmap is proposed, comprising: (1) the mapping of column-based networks (columnar connectomes), (2) connectome-guided studies of circuitry and perception, and (3) column-targeted design of optical BMIs. We predict this approach will increase the specificity and sophistication needed for realistic, vibrant visual perception.

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Cocoonase is indispensable for Lepidoptera insects breaking the sealed cocoon

Cocoonase is indispensable for Lepidoptera insects breaking ...

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中国蚕学会2021年学术年会

作者： Tingting Gai Xiaoling Tong Minjin Han Chunlin Li Chunyan Fang Yunlong Zou Hai Hu Hui Xiang Zhonghuai Xiang Cheng Lu Fangyin Dai State Key Laboratory of Silkworm Genome Biology Key Laboratory of Sericultural Biology and Genetic BreedingMinistry of Agriculture and Rural AffairsCollege of BiotechnologySouthwest University Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology Institute of Insect Science and TechnologySchool of Life SciencesSouth China Normal University

Many insects spin cocoons to protect the pupae from unfavorable environments and *** emerging from the pupa,the moths must escape from the sealed *** works identified cocoonase as the active enzyme loosening the cocoon to form an ***,using bioinformatics tools,we show that cocoonase is specific to Lepidoptera and that it probably existed before the occurrence of lepidopteran insects spinning cocoons.

关键词： Cocoonase is indispensable for Lepidoptera insects breaking the sealed cocoon

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Additive manufacturing of TRIP-assisted dual-phases Fe₅₀Mn₃₀Co₁₀Cr₁₀ high-entropy alloy: Microstructure evolution, mechanical properties and deformation mechanisms

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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 2021年 814卷 141264-141264页

作者： Niu, Pengda Li, Ruidi Fan, Zhiqi Yuan, Tiechui Zhang, Zhijiang Cent South Univ State Key Lab Powder Met Changsha 410083 Peoples R China

The metastable dual-phase non-equiatomic Fe50Mn30Co10Cr10 high entropy alloy (HEA) was successfully prepared via laser melting deposition (LMD) technique. The phase composition, microstructure and mechanical performance were systematically characterized at different sections of LMDed HEA samples. The as-printed HEA specimens were dominated by FCC ? phase, plate and needle-like HCP ? phase, and high density stacking faults and dislocations were observed at high magnification. The as-printed samples exhibited anisotropic mechanical properties, together with the maximum ultimate tensile strength of 760 MPa and maximum elongation of 28%. The fracture surface along X and Z directions exhibit smooth curve shape, while the fracture surface along Y direction shows saw tooth shape, indicating the boundary of melt pool is weakly bounded. After deformation, the deformation bands were observed in the FCC matrix, showing that the plastic strain was controlled by FCC ? phase. In addition, stacking faults, dislocation increase significantly owing to the formation of stacking fault is caused by sliding of Shockeley partial dislocation, and the stacking fault is the core of HCP martensite nucleation.

关键词： high entropy alloy Additive manufacturing Mechanical properties Deformation mechanism

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Antimicrobial hydrogels with controllable mechanical properties for biomedical application

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JOURNAL OF MATERIALS research 2019年第11期34卷 1911-1921页

作者： Chen, Si-Hao Li, Zhi Liu, Zu-Lan Cheng, Lan Tong, Xiao-Ling Dai, Fang-Yin Southwest Univ State Key Lab Silkworm Genome Biol Chongqing 400715 Peoples R China Southwest Univ Coll Text & Garment Chongqing Engn Res Ctr Biomat Fiber & Modern Text Chongqing 400715 Peoples R China Southwest Univ Coll Biotechnol Minist Agr Key Lab Sericultural Biol & Genet Breeding Chongqing 400715 Peoples R China

The antibacterial hydrogels can be widely used in the biomedical area owing to their excellent properties. The main limitation of antibacterial hydrogels is their poor mechanical strength. In this study, the novel hydrogels were fabricated with a mixture of silk fibroin (SF), chitosan (CH), agarose (AG), and silver nanoparticles (SNPs) via facile reaction condition without inorganic substances. The mechanical property of these fabricated hydrogels can be modulated by the concentration of SF or AG. The rheological studies demonstrated enhanced elasticity of CH-doped hydrogels. Because of the presence of CH and Ag in hydrogels, the antimicrobial property against gram-positive and gram-negative bacteria was exhibited. Cytocompatibility test proved the very low toxic nature of the hydrogels. In addition, these composite hydrogels have a smaller porosity, higher swelling ratio, and good compatibility, indicating their great potential for biomedical application.

关键词： biomedical composite Ag porosity

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Molecular basis of the silkworm mutant rel causing red egg color and embryonic death

Molecular basis of the silkworm mutant rel causing red egg c...

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中国蚕学会2021年学术年会

作者： Jiangwen Luo Erxia An Yaru Lu Ling Yang Tingting Gai Songzhen He SongYuan Wu Hai Hu Chunlin Li Cheng Lu Xiaoling Tong Fangyin Dai State Key Laboratory of Silkworm Genome Biology Key Laboratory of Sericultural Biology and Genetic BreedingCollege of BiotechnologySouthwest University

The coloration and hatchability of insect eggs can affect individual and population ***,few genetic loci have been documented to affect both traits,and the genes involved in regulating these two traits are *** silkworm recessive mutant rel shows both red egg color and embryo *** studied the molecular basis of the rel phenotype *** genetic analysis,gene screening and sequencing,we found that two closely linked genes,BGIBMGA003497(Bm-re) and BGIBMGA003697(BmSema1a),control egg color and embryo mortality,*** base pairs of the Bm-re gene are deleted in its open reading frame,and BmSema1a is expressed at abnormally low levels in mutant ***1a gene function verification was performed using RNAi and CRISPR/*** of the BmSema1a gene can cause the death of silkworm *** study revealed the molecular basis of silkworm rel mutant formation and indicated that the Sema1a gene is essential for insect embryo development.

关键词： BmSema1a CRISPR/Cas9 embryonic mortality red egg silkworm

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