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Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

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1

Awang Saifudin, Awang Raisudin, and Nurul Musfirah Mazlan. "Computational Exploration of a Two-Spool High Bypass Turbofan Engine's Component Deterioration Effects on Engine Performance." Applied Mechanics and Materials 629 (October 2014): 104–8. http://dx.doi.org/10.4028/www.scientific.net/amm.629.104.

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Aircraft engines are exposed to degradation due to several factors such as environmental air pollution, fuel content and ageing or degradation of engine’s components, which are experienced within specified time. While the turbofan in operation, its components deteriorate and consequently affect its performance. This study is aimed to computationally investigate the effect of components degradation on engine performance. A high bypass turbofan engine operated at cruise is selected for this evaluation and the simulation was performed using the Gas Turbine Simulation Program (GSP). The affected components considered are turbines and compressors with deterioration rate ranging from 0% to 5%. The effect of selected deterioration rate on engine thrust and thrust specific fuel consumption (TSFC) is studied. Results obtained show an agreement with literature where reduction in engine thrust and TSFC are observed. Turbine’s fouling has been found to be more severe than erosion in terms of power and efficiency losses. However, in terms of the overall performance, the erosion effect is more severe than fouling.

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2

LEKVEISHVILI, MARIAM, and HANS KLOMPEN. "Phylogeny of infraorder Sejina (Acari: Mesostigmata)." Zootaxa 629, no. 1 (September 3, 2004): 1. http://dx.doi.org/10.11646/zootaxa.629.1.1.

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Phylogenetic relationships among the families in the infraorder Sejina and the position of Sejina relative to other infraorders of Mesostigmata are re-examined based on molecular and morphological data. Data sets included DNA sequence data for complete 18S, EF-1 , partial CO1genes, and 69 morphological characters. The two families of Heterozerconina consistently group within Sejina, and we propose to synonymize Heterozerconina with Sejina (Sejina s.l). Microgyniina is not the closest relative of Sejina. Rather, Sejina s.l. most often groups with Gamasina. Uropodellidae and Ichthyostomatogasteridae are sister groups and this lineage forms the sister group to Discozerconidae plus Heterozerconidae. Overall, we recognize 5 families within Sejina: Uropodellidae, Ichthyostomatogasteridae, Sejidae, Discozerconidae, and Heterozerconidae.

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3

He, Yi Qiang, Bin Qiao, Jian Ming Yang, and Li Chao Feng. "Research Status and Developing of Metal Injection Molding." Advanced Materials Research 629 (December 2012): 100–104. http://dx.doi.org/10.4028/www.scientific.net/amr.629.100.

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Metal injection molding(MIM) is a high efficient and near net shape manufacturing technology, which is appropriate for parts of small size and complex shape. MIM provides a viable method to fabricate metal and metal matrix composites with discontinuous reinforcements, and micro metal injection molding (μMIM) is applied to manufacturing products at micro scale. The status of the research and development of MIM and μMIM are reviewed. Processes including mixing, injection molding and subsequent debinding and sintering are summarized. And technical characteristic, injection processing and application of μMIM are introduced. The disadvantages in mixing, injection molding and debinding processes limit MIM to fabricating components with small size, low precision and mechanical properties, and it is necessary to prevent the powder from reuniting and avoid any oxidation and impurity during μMIM process. Further investigations in these areas will give rise to being explored of full potential of MIM technology.

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4

He, Yi Qiang, Jian Ming Yang, Bin Qiao, and Li Chao Feng. "Microstructure and Mechanical Properties of Metal Injection Molded SiC_P/ Cu Composites." Advanced Materials Research 629 (December 2012): 105–9. http://dx.doi.org/10.4028/www.scientific.net/amr.629.105.

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SiCP/Cu composite was prepared by metal injection molding process. Microstructure, mechanical properties, fracture surface, and wear resistance of SiCP/Cu composite were investigated in this study. The research results show that SiCP/Cu were sintered sucessfully by the sintering process with hydrogen protection and high temperature of 1050°C. The tensile strength of the composites depends on the fraction and distribution of SiC particles which is resulted from microcracks nucleate in the matrix between SiC particles because of SiC particle aggregation. The tensile strengths of 5vol.%, 10vol.%, and15vol.%SiCP/Cu are 254MPa, 291MPa and 278MPa separately. SiC particles are contribute to enhance the abrasive resitance of the composite when particle volume fraction increase from 10% to 15%.

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5

Li, Wei Dong, Gang Liu, Xue Feng An, and Xiao Su Yi. "Effects of Z-Direction Flowing RTM Technology on Distribution of Composites Fiber Volume Fraction and Thermoplastic Toughener." Advanced Materials Research 629 (December 2012): 110–14. http://dx.doi.org/10.4028/www.scientific.net/amr.629.110.

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In this paper, a novel Z-direction flowing RTM technology using an in-mold resin distributor has been applied to the “Ex-situ” composites and the process feasibility was evaluated. The effect of injection type on distribution of fiber volume fraction and thermoplastic toughener in the composite were investigated. The results showed that perfect internal quality composite panels could be fabricated via the novel RTM technology and the injection type has some effects on distribution of fiber volume fraction along the thickness direction of the panels. After the injection and curing cycle, the typical bicontinuous phase structures were mainly observed at the interlaminar and also slightly spreading into the fibre beam.

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6

Ma, Qiang, and Jun Zhi Cui. "Second-Order Two-Scale Analysis Method for the Quasi-Periodic Structure of Composite Materials under Condition of Coupled Thermo-Elasticity." Advanced Materials Research 629 (December 2012): 160–64. http://dx.doi.org/10.4028/www.scientific.net/amr.629.160.

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The second-order two-scale asymptotic expansions of the increment of temperature and the displacement for the quasi-periodic structure of composite materials under coupled thermo-elasticity condition are derived formally in this paper. The characteristic of the asymptotic model is the coupling between macroscopic scale and microscopic scale. Numerical examples including different coefficients are presented illustrating the efficiency and stability of the computational strategy. They show that the expansions to the second terms are necessary to obtain the thermal and mechanical behavior precisely, and the local and global oscillation of the increment of temperature and displacement are dependent on the microscopic and macroscopic part of the coefficients respectively.

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7

Shen, Xian Feng, Wen Hua Teng, Wen Rong Huang, and Chao Xu. "Gas-Jet-Assisted Keyhole Laser Welding of Q235 Mild Steel." Advanced Materials Research 629 (December 2012): 180–86. http://dx.doi.org/10.4028/www.scientific.net/amr.629.180.

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Increases in the penetration depth of laser welding has gained undoubted interest, especially in the aerospace, power station, ship building, and other heavy industries. Gas-jet-assisted keyhole laser welding is a prospective method for improving the penetration of conventional laser welding. A series of experiments using this method were conducted with different parameters of the assisted gas jet and the welding speed. The microstructures of weld joints were observed using optical microscopy, and microhardness was also measured. The investigation results showed that the penetration depth of this laser welding increased by more than 20%, with a maximum increase of approximately 26%, at different welding speeds, while the weld width was significantly reduced compared with that of conventional laser welding. The key factor affecting the penetration increase is the interaction between the assisted gas jet and the plasma. The penetration increase was determined by the distribution and amplitude of the assisted gas jet at the position of the keyhole orifice. The grain in the heat-affected zone (HAZ) and weld seam of gas-jet-assisted keyhole laser welding was finer, and the number of columnar grains was also significantly reduced. The microhardness of the HAZ for the assisted gas jet was much lower, and more pearlite and less martensite were observed this zone. This was caused by the reduced maximum temperature of the molten pool, reduced high-temperature residence time, increased cooling rate, and diminished temperature gradient with the introduction of the assisted gas jet.

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8

Xiang, Jun Ting, Jӧrg Uwe Schlüter, and Fei Duan. "CFD Validation and Analysis of a Single-Stage Axial Compressor." Applied Mechanics and Materials 629 (October 2014): 109–18. http://dx.doi.org/10.4028/www.scientific.net/amm.629.109.

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The knowledge about changes of flow field properties during axial compressor operationat high and relatively low speed is limited. This work provides a numerical approach to addressthese problems. Validations about the numerical scheme and the test of compressor performance at various operating speeds are conducted. The results show that computational fluid dynamics (CFD)is capable in predicting the compressor performance. Flow property changes during the compressoroperation are discussed and explanations are proposed. This work reinforces the understanding of compressor operation and provides valid results for future reference.

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9

Burston, Martin T., Roberto Sabatini, Reece Clothier, Alessandro Gardi, and Subramanian Ramasamy. "Reverse Engineering of a Fixed Wing Unmanned Aircraft 6-DoF Model for Navigation and Guidance Applications." Applied Mechanics and Materials 629 (October 2014): 164–69. http://dx.doi.org/10.4028/www.scientific.net/amm.629.164.

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A method for deriving the parameters of a six-degree-of-freedom (6-DoF) aircraft dynamics model by adopting reverse engineering techniques is presented. The novelty of the paper is the adaption of the 6-DoF Aircraft Dynamics Model (ADM) as a virtual sensor integrated in a low-cost navigation and guidance system designed for small Unmanned Aircraft (UA). The mass and aerodynamic properties of the JAVELIN UA are determined with the aid of an accurate 3D scanning and CAD processing. For qualitatively assessing the calculated ADM, a trajectory with high dynamics is simulated for the JAVELIN UA and compared with that of a published 6-DoF model of the AEROSONDE UA. Additionally, to confirm the validity of the approach, reverse engineering procedures are applied to a published CAD model of the AEROSONDE UA aiding to the calculation of the associated 6-DoF model parameters. A spiral descent trajectory is generated using both the published and calculated parameters of the AEROSONDE UA and a comparative analysis is performed that validates the methodology. The accurate knowledge of the ADM is then utilized in the development of a virtual sensor to augment the UA navigation and guidance system in case of primary navigation sensor outages.

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10

Jo, Hudyjaya Siswoyo, Mark Tee Kit Tsun, and Carmella Sim Lee Yoong. "Development of Blimp Platform for Aerial Photography." Applied Mechanics and Materials 629 (October 2014): 170–75. http://dx.doi.org/10.4028/www.scientific.net/amm.629.170.

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This paper presents the development of a semi-automated blimp platform for aerial photography. The blimp can be tele-operated from a ground station and is capable of autonomously holding its heading and altitude when the pilot releases control. The blimp consists of a helium-filled envelope to achieve the buoyancy and a pair of propellers to drive the blimp in the desired direction. A basic control algorithm and sensing system are also proposed to control and maintain the heading and altitude of the blimp.

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11

Ding, Kun Ying, Peng Cheng Lu, and Zhen Sun. "Nanoindentation Behaviors of HVOF WC-10Co-4Cr Coating after Heat Treatment." Advanced Materials Research 629 (December 2012): 14–18. http://dx.doi.org/10.4028/www.scientific.net/amr.629.14.

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WC-10Co-4Cr cermet coatings were deposited on low carbon steel using the HVOF technique, then heat treated by different process (300 °C × 3 hours, 400 °C × 3 hours, and 500 °C × 3 hours). The influences of heat treatment on microhardness, elasticity modulus of coatings were studied by nanoindentation method in this paper. The results show that the microhardness increased with the heat-treated temperature increasing, but the tendency of elasticity modulus was opposite. In the case of 500 °C × 3 hours heat-treated coating, the microhardness increased by approximately 30% and elasticity modulus decreased by approximately 15% in comparison with that of as-sprayed coating.

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12

Liu, Ying Xiang, Jun Kao Liu, Wei Shan Chen, and Sheng Jun Shi. "Design and Analysis of a Cylindrical Traveling Wave Ultrasonic Motor Using Composite Transducer." Materials Science Forum 628-629 (August 2009): 103–8. http://dx.doi.org/10.4028/www.scientific.net/msf.628-629.103.

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A cylindrical type traveling wave ultrasonic motor using composite transducer is proposed in this paper. A composite transducer is attached to the cylinder on its outer surface to excite two degenerate flexural vibration modes spatially and temporally orthogonal to each other in the cylinder. In this new design, a single transducer can excite the flexural traveling wave in the cylinder. Thus, an elliptical motion is achieved at the particle on the tooth. And the driving force is the frictional force between rotor and teeth. The working principle of proposed motor is analyzed. The cylinder and transducer are designed with FEM. The sensitive parameters of resonance frequencies of transducer and cylinder are gained with modal analysis. The resonance frequencies of two vibration modals of stator are degenerated, and the motion trajectories of nodes on the teeth are analyzed. The result of transient analysis shows that the trajectory of node on the tooth is nearly an ellipse. The results of this paper could guide the development of this new type of motor.

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13

Zhou, Wan Chun, Tong Zhou, and Dong Wang. "The Innovative Design of Folding Umbrellalike Mechanism." Materials Science Forum 628-629 (August 2009): 109–12. http://dx.doi.org/10.4028/www.scientific.net/msf.628-629.109.

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The innovation of mechanism is essential to the creative mechanical design. The innovative design of mechanism not only has important theoretical academic values, but also has greater economic and social benefits. In this paper, we have conducted an innovative design on folding umbrellalike mechnism by using regenerated kinematic chain. This creative design is feasibile in technology, and is meaningful to improve the self-design of our mechanical products, the ability of innovation and internation空al competitiveness.

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14

Kadlečík, O., R. Kasarda, and L. Hetényi. "Genetic gain, increase in inbreeding rate and generation interval in alternatives of Pinzgau breeding program." Czech Journal of Animal Science 49, No. 12 (December 13, 2011): 524–31. http://dx.doi.org/10.17221/4340-cjas.

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The aim of this paper was to analyse alternatives of Pinzgau breeding program. Alternatives were optimised for genetic gain of selection index composed of parameters of milk efficiency traits and increase in inbreeding per generation. A scheme using the mating of 70% old proven sires led to a lower increase in inbreeding per generation from 0.248% to 1.903% than a young sires scheme with 0.313–2.177% or 0.303–2.18% without MOET when 2, 5, 10 and 20 proven sires were used in the population. Schemes using 70% mating of young sires resulted in a shorter generation interval of 3.46 years in comparison with proven sires scheme with 4.06 years. Young sires breeding program yielded lower genetic gain from 420.1 SKK per year when 20 proven sires were used to 578.44 SKK per year when 2 proven bulls were selected in the population. Proven sires breeding program led to higher genetic gain from 400.17 SKK (with 20 proven bulls) to 629.72 SKK (2 proven bulls). In a group with 20 proven bulls young sires breeding program with MOET resulted in genetic gain 466.38 SKK comparable to young sires breeding program without MOET with 10 proven sires. In groups with 10 or 5 proven bulls this alternative led to the highest genetic gain 515.45 SKK and 565.25 SKK, respectively. A group with 2 proven bulls in MOET scheme achieved similar genetic gain (629.14 SKK) like the proven sires scheme.  

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15

Roumier, Mathilde, Louis Terriou, Mohamed Hamidou, Antoine Dossier, Anne Sophie Morin, Virginie Zarrouk, Mickael Ebbo, et al. "A Multicenter Study Evaluating the Safety of Romiplostim at Maximal Dosage for Emergency Bleeding Situations in Immune Thrombocytopenia." Blood 128, no. 22 (December 2, 2016): 2541. http://dx.doi.org/10.1182/blood.v128.22.2541.2541.

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Abstract Introduction: The serious consequences of severe, life-threatening bleeding in immune thrombocytopenia (ITP) justify the use of several regimens, including platelet transfusions, high-dose parenteral glucocorticoid and intravenous immunoglobulins. The goal of such treatments is to rapidly elevate the platelet count to a level where the risk of severe bleeding is minimized. We lack experience with the use of thrombopoetin receptor agonists (Tpo-RAs) in this situation of emergency. The aim of this study was to evaluate the safety of the use of romiplostim at maximal dosage in patients with severe bleeding manifestations, who have previously failed to respond to corticosteroids (CST) and intravenous immunoglobulin (IVIg). Patients and Methods: We carried out a multicenter retrospective study in France. We included ITP patients with platelet count < 30 x 109/L.and severe bleeding manifestations, who have failed to respond to corticosteroids and IVIg, and have received a rescue therapy with romiplostim at maximal dosage (ie., 10 mg/kg body weight per week). Failure to treatment was defined according to standardized international criteria and severe bleeding manifestations as a score >8 according to the bleeding score previously reported by our group that take into account cutaneous, mucosal and visceral bleeding. Physicians were interviewed and patients' medical charts collected using the standardized form of the Referral Center for Adult ITP. Complete response (CR) and Response (R) were defined according to standardized international criteria: platelet count > 30x109/L with at least a doubling of the baseline value or >100 x109/L. Non-response (NR) was defined as the absence of platelet count increase >30 x109/L with at least a doubling of the baseline count. Results: Fifteen patients (8 men/7 women) were included in the study. The median age was 68 ± 20.9 years [range 17-92]. Two patients presented secondary ITP according to the international definition criteria. Eleven were newly diagnosed ITP, and 4 chronic ITP. Severe bleeding symptoms were the manifestation of ITP in all cases, with a median bleeding score of 16 [9-28], including 4 intracranial hemorrhage, 2 metrorrhagia, 1 macroscopic hematuria, 3 gastrointestinal bleeding and 1 haemoperitoneum. The median platelet count was 1 [0-4]. All patients had received corticosteroids (1mg/bw/day) including 12 pulses of methylprednisolone and IVIg (median dose 2 g/bw). Twelve have also received 8 mg of vinblastine (1 to 3 injections). Nine received platelet transfusions and 4 received blood tranfusions. One patient had received anti-CD20 therapy (rituximab) the same day as TPO-RA therapy, and another hydroxychloroquine before starting TPO-RA therapy. Romiplostim was started 12 days [range 6-32] in median after the first bleeding episode. At that time bleeding symptoms were severe (>8), and the median platelet count was 4 [1-47]. All received 10 mg/kg body weight of romiplostim (including 3 escalating dose). At day 7 after TPO-RA initiation, 9 patients achieved a CR, 1 patient achieved a R and 5 were still non-responder. At days 14, 10 patients achieved a CR and 5 were still non-responder. During the first month of follow-up, the maximal platelets count among the responders was 590 [range: 312-1169], 9 patients experienced a platelet count > 500 x 109/L. One 51 years old patient, bed bound for a muscular hematoma, experienced a deep vein thrombosis with asymptomatic pulmonary embolism, 13 days after IVIg and 5 days after TPO-RA initiation, with a platelet count of 629.109/L. One patient presented superficial thromboembolism of the arm, 14 days after IVIg and 9 days after TPO-RA initiation with a platelet count of 162.109/L. They were both treated with anticoagulation without complication. After a median follow-up of 10 months, no other TPO-RA-related side effects were observed, TPO-RA was discontinuated in 10 patients. Conclusion: Our study demonstrated the relative safety and the interest of the use of romiplostim at the maximal dose in emergency bleeding situation in patients with failure of conventional therapy. However, risk of venous thromboembolism should be carrefully assess in this situation. Disclosures Terriou: amgen: Consultancy; Novartis: Consultancy.

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16

Kim, Mi Hye, Ji Yeon Seo, Mi Kyung Han, Hye Ryung Kang, Seong Soon Kim, Bo Ram Kim, Alexandra Zakharova, Ji Eun Woo, and Jong‐Sang Kim. "Chronic administration of Artemisia annua L. attenuates oxidative stress induced by D‐galactose in mice (629.10)." FASEB Journal 28, S1 (April 2014). http://dx.doi.org/10.1096/fasebj.28.1_supplement.629.10.

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17

Young, Bridget E., Ardythe L. Morrow, Barbara S. Davidson, Sheela R. Geraghty, and Nancy F. Krebs. "Inflammatory cytokines in human milk are inter‐correlated and may be related to infant growth characteristics and maternal weight status." FASEB Journal 27, S1 (April 2013). http://dx.doi.org/10.1096/fasebj.27.1_supplement.629.10.

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18

Hinde, Katie, Heather Drought, Michelle Wechsler, and Robin Bernstein. "Bioactive factors in the milk of a non‐human primate biomedical model." FASEB Journal 27, S1 (April 2013). http://dx.doi.org/10.1096/fasebj.27.1_supplement.629.14.

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19

Altman, Robin, and Kellie Whited. "Collaborative PhUn Week Program Engages Elementary School Children in Physiology Learning and Jumpstarts Year‐Long Physiology Curriculum." FASEB Journal 32, S1 (April 2018). http://dx.doi.org/10.1096/fasebj.2018.32.1_supplement.629.10.

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20

Walton, Kristen LW. "“It's Complex”: Student Preconceptions about the Difficulty of Physiology Courses." FASEB Journal 32, S1 (April 2018). http://dx.doi.org/10.1096/fasebj.2018.32.1_supplement.629.14.

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21

Cagle, Patrice, Tonisha Coburn, Ade Shofoluwe, and Patrick Martin. "Rosehip ( Rosa canina ) Extracts Prevent Cell Proliferation and Migration in Triple Negative Breast Cancer Cells." FASEB Journal 29, S1 (April 2015). http://dx.doi.org/10.1096/fasebj.29.1_supplement.629.14.

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22

Kim, Do Hyung, Zhe Lu, Qun Lu, Michael Shea, and Yan‐Hua Chen. "Dual Roles of Claudin‐7 in Human Lung Cancer Cell Growth and Metastasis." FASEB Journal 29, S1 (April 2015). http://dx.doi.org/10.1096/fasebj.29.1_supplement.629.10.

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23

Racine, Elizabeth F., Qingfang Wang, Sarah B. Laditka, Christina Wilson, and Allison Mignery. "Associations between Food Types, the Concentration of SNAP Approved Stores and Community Health." FASEB Journal 26, S1 (April 2012). http://dx.doi.org/10.1096/fasebj.26.1_supplement.629.10.

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