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Journal articles on the topic "Duo mei ti"
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Shi, Hong, Minghui Liu, Lin Cong, and Lizhong Wang. "A study on preparation and mechanism of Ni based ternary alloy." Materials Express 9, no. 6 (September 1, 2019): 681–85. http://dx.doi.org/10.1166/mex.2019.1540.
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In this paper, the preparation of Ni–Ti–Nb amorphous alloy materials made by mechanical alloying method has been studied. The Ni–Ti–Nb mixed powders obtained by different mechanical alloying times have been analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the Ni–Ti–Nb mixed powders can be mechanically alloyed after milling for 10 hours, and retained with ball milling. Continuously, Ni, Ti and Nb alloy powders diffuse with each other. When the diffusion rate increases to a certain extent, it is too late to form an ordered structure and form a Ni–Ti–Nb amorphous alloy. The stress and displacement curves are obtained by testing the tensile strength at room temperature. The stress changes of the restrained curves are relatively stable when the displacement is 6–18 mm, and the stress changes of the unconstrained curves show a distinct upward trend when the displacement is 6–18 mm, indicating that the strength of the specimens treated with restraint is higher than that of the specimens treated with restraint. This is due to the high internal stress of the material caused by the restraint and the decrease in the tensile strength of the alloy material.
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Tomczak, Yoann, Kjell Knapas, Markku Leskelä, and Mikko Ritala. "In situ reaction mechanism studies on the Ti(NMe2)2(OiPr)2-D2O and Ti(OiPr)3[MeC(NiPr)2]-D2O atomic layer deposition processes." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 32, no. 1 (January 2014): 01A121. http://dx.doi.org/10.1116/1.4843496.
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Liao, Yu-Chin, Po-Sung Chen, Chao-Hsiu Li, Pei-Hua Tsai, Jason Jang, Ker-Chang Hsieh, Chih-Yen Chen, et al. "Development of Novel Lightweight Dual-Phase Al-Ti-Cr-Mn-V Medium-Entropy Alloys with High Strength and Ductility." Entropy 22, no. 1 (January 6, 2020): 74. http://dx.doi.org/10.3390/e22010074.
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A novel lightweight Al-Ti-Cr-Mn-V medium-entropy alloy (MEA) system was developed using a nonequiatiomic approach and alloys were produced through arc melting and drop casting. These alloys comprised a body-centered cubic (BCC) and face-centered cubic (FCC) dual phase with a density of approximately 4.5 g/cm3. However, the fraction of the BCC phase and morphology of the FCC phase can be controlled by incorporating other elements. The results of compression tests indicated that these Al-Ti-Cr-Mn-V alloys exhibited a prominent compression strength (~1940 MPa) and ductility (~30%). Moreover, homogenized samples maintained a high compression strength of 1900 MPa and similar ductility (30%). Due to the high specific compressive strength (0.433 GPa·g/cm3) and excellent combination of strength and ductility, the cast lightweight Al-Ti-Cr-Mn-V MEAs are a promising alloy system for application in transportation and energy industries.
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Yamamoto, Kotaro, Masahiro Yasutake, Zhiyun Noda, Stephen Matthew Lyth, Junko Matsuda, Masamichi Nishihara, Akari Hayashi, and Kazunari Sasaki. "Metallic Gas Diffusion Layers for Polymer Electrolyte Fuel Cells." ECS Meeting Abstracts MA2022-02, no. 40 (October 9, 2022): 1490. http://dx.doi.org/10.1149/ma2022-02401490mtgabs.
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1. Introduction Various carbon materials are currently used in PEFCs.1,2 In particular, relatively expensive porous carbon materials such as carbon fiber cloth and carbon paper with a thickness of around 0.2 mm are commonly used as the gas diffusion layers (GDLs), which ensure gas flow, electron transport, and water management in fuel cells.3,4 However, electrical conductivity of these carbon materials could be lower than that of metallic materials. Another technical issue is the reduction of GDL thickness to achieve higher power density per cell stack volume, which could however lead to a decrease in mechanical strength of GDLs.5 Here in this study, we evaluate and compare several types of metallic materials to apply as GDLs. Using such alternative metallic GDLs, current-voltage (I-V) characteristics were measured and overvoltages were separated. The purpose of this study is to examine possibilities of using metallic GDLs for PEFCs, by varying materials, thickness, porosity, and preparation conditions. 2. Experimental Ti fiber sheets and stainless steel mesh sheets were used as GDL substrates, and Sn coating was made on the sheets. Then, current-voltage characteristics of the cells using these GDLs were evaluated. Five types of porous metallic sheets were used as GDLs: (i) Ti fiber sheet with a porosity of 70% and thickness of 100 μm, (ii) Ti fiber sheet with Sn plating layer (Sn/Ti sheet), (iii) Ti fiber sheet with Pt nanoparticles and Sn plating layer (Sn/Pt/Ti sheet), (iv) SUS316 mesh with a porosity of 60% and thickness of 32 μm, and (v) SUS316 mesh with porous Sn layer. For all the evaluations, the electrocatalyst layers were prepared by dispersing Pt/C (Pt 46.5%, TEC10E50E, Tanaka Kikinzoku Kogyo Corp., Japan), 99.5% ethanol, pure water, and 5% Nafion solution using an ultrasonic homogenizer. The dispersions were printed on the electrolyte membrane (Nafion 212) using a spray printer (C-3 J, Nordson). The electrode area was 1.0 cm2 (1.0 cm × 1.0 cm), and the Pt loading on both electrodes was 0.3 mg-Pt cm-2. The metallic GDL was used for the cathode, and a carbon paper (EC-TPI-060T) was used as the standard GDL for the anode. In the electrochemical characterization of this study, electrochemical impedance spectroscopy (EIS, 1255WB, Solatron) was applied to measure the current-voltage characteristics and to separate overvoltages. 3. Results and discussion I-V characteristics of the cells with the MEAs (i) to (v) are shown in Figure 1. Decrease in cell performance was mainly caused by an increase in ohmic losses. Comparing the MEA (i) and the MEA (iv), Ti fiber sheet showed higher electrical conductivity than stainless steel mesh sheet. Comparing the MEA (i) and the MEA (ii), it was confirmed that the Sn plating on the Ti fiber contributed to a reduction of ohmic loss and concentration overvoltage. Furthermore, the current-voltage curve of the MEA (iii) indicates higher conductivity than that of the MEA (ii), suggesting that the Pt coating promoted the Sn plating or acted as catalysts on the electrocatalyst layer side during the operation of the cell. When the SUS316 mesh sheet was used for the MEA (iv), the concentration overvoltage tended to fluctuate in each measurement. For the MEA (v), a decrease in cell performance was observed. These could be caused by, e.g., degradation of stainless steel due to strong acidity, and contact resistance between the Sn porous layer and the mesh sheet. Further study is in progress to improve I-V characteristics of MEAs by optimizing materials and structure of metallic GDLs. Acknowledgement Financial support from New Energy and Industrial Technology Development Organization (NEDO) is gratefully acknowledged (Contract No. 20001214-0). References Takahashi, T. Ikeda, K. Murata, O. Hotaka, S. Hasegawa, Y. Tachikawa, M. Nishihara, J. Matsuda, T. Kitahara, S. M. Lyth, A. Hayashi, and K. Sasaki, J. Electrochem. Soc., 169, 044523 (2022). Larminie, and A. Dicks, Fuel Cell Systems Explained, John Wiley & Sons, (2006). Kitahara, T. Konomi, H. Nakajima, and J. Shiraishi, kikaib, 76(761), 101 (2010). A. Reiser, L. Bregoli, T. W. Patterson, J. S. Yi, D. Yang, M. L. Perry, and T. D. Jarvi, Electrochem. Solid-State Lett., 8, A273 (2005). N. Hussain, E. V. Steen, S. Tanaka, and P. Levecque, J. Power Sources, 337, 18 (2017).
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Kim, Je-Deok, and Akihiro Ohira. "Water Electrolysis Using a Porous IrO2/Ti/IrO2 Catalyst Electrode and Nafion Membranes at Elevated Temperatures." Membranes 11, no. 5 (April 30, 2021): 330. http://dx.doi.org/10.3390/membranes11050330.
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Porous IrO2/Ti/IrO2 catalyst electrodes were obtained by coating IrO2 on both sides of three types of porous Ti powder sheets (sample 1, sample 2, and sample 3) using different surface treatment methods, and a hydrogen evolution catalyst electrode was obtained by coating Pt/C on carbon gas diffusion layers. A Nafion115 membrane was used as an electrolyte for the membrane electrode assemblies (MEA). Water electrolysis was investigated at cell temperatures up to 150 °C, and the electrical characteristics of the three types of porous IrO2/Ti/IrO2 catalyst electrodes were investigated. The sheet resistance of sample 1 was higher than those of samples 2 and 3, although during water electrolysis, a high current density was observed due to the nanostructure of the IrO2 catalyst. In addition, the structural stabilities of Nafion and Aquivion membranes up to 150 °C were investigated by using small angle X-ray scattering (SAXS). The polymer structures of Nafion and Aquivion membranes were stable up to 80 °C, whereas the crystalline domains grew significantly above 120 °C. In other words, the initial polymer structure did not recover after the sample was heated above the glass transition temperature.
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Zhang, Xiangkai, Hanting Ye, Jacob C. Huang, Taiyou Liu, Pinhung Lin, Yaocheng Wu, Mintsang Tsai, Yuchin Liao, and Jason S. C. Jang. "Nano-Scaled Creep Response of TiAlV Low Density Medium Entropy Alloy at Elevated Temperatures." Materials 13, no. 1 (December 20, 2019): 36. http://dx.doi.org/10.3390/ma13010036.
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A low density, medium entropy alloy (LD-MEA) Ti33Al33V34 (4.44 g/cm3) was successfully developed. The microstructure was found to be composed of a disordered body-centered-cubic (BCC) matrix and minor ordered B2 precipitates based on transmission electron microscopy characterization. Equilibrium and non-equilibrium modeling, simulated using the Calphad approach, were applied to predict the phase constituent. Creep behavior of {110} grains at elevated temperatures was investigated by nanoindentation and the results were compared with Cantor alloy and Ti-6Al-4V alloy. Dislocation creep was found to be the dominant mechanism. The decreasing trend of hardness in {110} grains of BCC TiAlV is different from that in {111} grains of face-centered-cubic (FCC) Cantor alloy due to the different temperature-dependence of Peierls stress in these two lattice structures. The activation energy value of {110} grains was lower than that of {111} grains in FCC Cantor alloy because of the denser atomic stacking in FCC alloys. Compared with conventional Ti-6Al-4V alloy, TiAlV possesses considerably higher hardness and specific strength (63% higher), 83% lower creep displacement at room temperature, and 50% lower creep strain rate over the temperature range from 500 to 600 °C under the similar 1150 MPa stress, indicating a promising substitution for Ti-6Al-4V alloy as structural materials.
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Du, Yajie, Zhaoxi Li, Jiangtao Xiong, Yipeng Chen, Shiwei Li, Jinglong Li, and Jihong Dong. "Diffusion Bonding of FGH 98 and CoCrNi-Based Medium-Entropy Alloy: Microstructure Evolution and Mechanical Tests." Crystals 11, no. 10 (September 23, 2021): 1158. http://dx.doi.org/10.3390/cryst11101158.
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The superalloy FGH98 was successfully diffusion bonded (DB) with medium-entropy alloy (MEA) Al3Ti3(CrCoNi)94 using pure Ni as the interlayer at a temperature range of 1050–1170 °C for 1 h under 5 MPa. The microstructure and mechanical properties of joints were investigated. The diffusion bonding seam was composed of an interlayer zone (IZ) and two diffusion-affected zones (DAZ). The IZ and DAZ beside the FGH98 consisted of cubic Ni3(TiAl)-type γ′ phases due to the diffusion of Ti and Al atoms. Meanwhile, the DAZ adjacent to the MEA consisted of spherical γ′ phases. Both of the γ′ phases with different morphology kept the coherent relationship with the matrix. Moreover, increase of bonding temperature led to the morphology of interlayer γ′ phase to transform from sphere to cube. Due to the strengthening effect of a mass of γ′ phase distributed evenly in IZ and the DAZ beside the FGH98, the microhardness and Young’s modulus of these two zones were higher than that of DAZ near the MEA. The maximum shear strength of DB joint, 592 MPa, was achieved in the joint bonded by 1150 °C, which was the typical ductile fracture feature confirmed by the shear dimples.
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Desboeufs, Karine, Franck Fu, Matthieu Bressac, Antonio Tovar-Sánchez, Sylvain Triquet, Jean-François Doussin, Chiara Giorio, et al. "Wet deposition in the remote western and central Mediterranean as a source of trace metals to surface seawater." Atmospheric Chemistry and Physics 22, no. 4 (February 18, 2022): 2309–32. http://dx.doi.org/10.5194/acp-22-2309-2022.
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Abstract. This study reports the only recent characterization of two contrasted wet deposition events collected during the PEACETIME (ProcEss studies at the Air–sEa Interface after dust deposition in the MEditerranean Sea) cruise in the open Mediterranean Sea (Med Sea) and their impact on trace metal (TM) marine stocks. Rain samples were analysed for Al, 12 TMs (Co, Cd, Cr, Cu, Fe, Mn, Mo, Ni, Pb, Ti, V and Zn) and nutrient (N, P, dissolved organic carbon) concentrations. The first rain sample collected in the Ionian Sea (Rain ION) was a typical regional background wet deposition event, whereas the second rain sample collected in the Algerian Basin (Rain FAST) was a Saharan dust wet deposition event. Even in the remote Med Sea, all background TM inputs presented an anthropogenic signature, except for Fe, Mn and Ti. The concentrations of TMs in the two rain samples were significantly lower compared to concentrations in rains collected at coastal sites reported in the literature, due to the decrease in anthropogenic emissions during the preceding decades. The atmospheric TM inputs were mainly dissolved forms, even in dusty Rain FAST. The TM stocks in the mixed layer (ML, 0–20 m) at the FAST station before and after the event showed that the atmospheric inputs were a significant supply of particulate TMs and dissolved Fe and Co for surface seawater. Even if the wet deposition delivers TMs mainly in soluble form, the post-deposition aerosol dissolution could to be a key additional pathway in the supply of dissolved TMs. At the scale of the western and central Mediterranean, the atmospheric inputs were of the same order of magnitude as ML stocks for dissolved Fe, Co and Zn, highlighting the role of the atmosphere in their biogeochemical cycles in the stratified Med Sea. In case of intense dust-rich wet deposition events, the role of atmospheric inputs as an external source was extended to dissolved Co, Fe, Mn, Pb and Zn. Our results suggest that the wet deposition constitutes only a source of some of dissolved TMs for Med Sea surface waters. The contribution of dry deposition to the atmospheric TM inputs needs to be investigated.
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Tubb, Erev E., Emmanuel C. Besa, Aristoteles Giagounidis, and Gustavo A. Fonseca. "Delayed Response to Lenalidomide in International Prognostic Scoring System (IPSS) Low Risk Myelodysplastic Syndrome (MDS)." Blood 110, no. 11 (November 16, 2007): 1447. http://dx.doi.org/10.1182/blood.v110.11.1447.1447.
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Abstract Lenalidomide was approved by the US Food and Drug Administration in December of 2005 for the treatment (tx) of transfusion-dependent anemia (TDA) in patients (pts) with MDS and chromosome 5q deletions (del5q). In the trial that secured the approval, 67% of 148 pts achieved red blood cell (RBC) transfusion independence (TI) with a median time to TI of 44 weeks. 90% of pts who achieved TI did so by completion of 3 months of therapy. In a companion study (MDS-002) pts lacking del5q the frequency of TI was only 26%. We report three cases of IPSS Low risk myelodysplasia MDS with a delayed response to lenalidomide. The patient characteristics are outlined in Table 1. Following a 6 to 11 month trial of lenalidomide for TDA in IPSS Low risk MDS delayed TI can occur 1 to 4 months after discontinuation of lenalidomide. Delayed TI was not associated with a cytogenetic response. The duration of response can last from 11 months to 16 months. Lenalidomide, a thalidomide analogue, is an immunomodulatory agent with anti-angiogenic and anti-neoplastic properties. Effects of lenalidomide such as increased production of interleukin-2 and interferon-γ have been linked to the appearance of lymphoid aggregates of a mixture of B and T cells in the BM specimens of responders. TI has previously been correlated with suppression of the del5q clone. In our patients, TI was achieved after discontinuation of lenalidomide following a reasonable ineffective trial and no apparent suppression of the del5 clone. A similar phenomenon was described by Raza, et al. in a single MDS patient treated with thalidomide. Interestingly, one patient had lymphoid aggregates of B and T cells throughout treatment, raising the possibility that the immune stimulatory effects of lenalidomide may be a variable against the del5q clone. The transient response may be due to immunomodulatory effects but persistence of the del5q clone in two of our patients and and dysplasia in the other, is responsible for the relapse after the immune response has waned. Re-treatment with lenalidomide in our patient did not prolong or re-induce another response. References Giagounidis AAN, Germing U, Aul C: Biologic and prognostic significance of chromosome 5q deletions in myeloid malignancies. Clin Cancer Res 2006, 12:5–10. List A, Kurtin S, Roe DJ, et al.: Efficacy of lenalidomide in myelodysplastic syndromes. N Engl J Med. 2005, 352:549–557. List A: Recent advances in the treatment of MDS. Clin Advances in Hematology. Oncology. 2007, Supp 10, Vol 5, Issue 7: 4–5 Raza A, Meyer P, Dutt D, et al. Thalidomide produces transfusion independence in long-standing refractory anemias of patients with myelodysplastic syndromes. Blood. 2001 Aug 15, 98(4):958–65.
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Santini, Valeria, Antonio Almeida, Aristoteles Giagounidis, Stephanie Gröpper, Anna Jonasova, Norbert Vey, Ghulam J. Mufti, et al. "Efficacy and Safety of Lenalidomide (LEN) Versus Placebo (PBO) in RBC-Transfusion Dependent (TD) Patients (Pts) with IPSS Low/Intermediate (Int-1)-Risk Myelodysplastic Syndromes (MDS) without Del(5q) and Unresponsive or Refractory to Erythropoiesis-Stimulating Agents (ESAs): Results from a Randomized Phase 3 Study (CC-5013-MDS-005)." Blood 124, no. 21 (December 6, 2014): 409. http://dx.doi.org/10.1182/blood.v124.21.409.409.
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Abstract Background: Treatment options for RBC-TD pts with lower-risk MDS without del(5q) who are unresponsive or refractory to ESAs are very limited. In a previous phase 2 study, MDS-002 (CC-5013-MDS-002), LEN was associated with achievement of RBC-transfusion independence (TI) ≥ 56 days in 26% of pts with IPSS Low/Int-1-risk MDS without del(5q) (Raza et al. Blood 2008;111:86-93). This international phase 3 study (CC-5013-MDS-005) compared the efficacy and safety of LEN versus PBO in RBC-TD pts with IPSS Low/Int-1-risk MDS without del(5q) unresponsive or refractory to ESAs. Methods: This multicenter, randomized, double-blind, parallel-group phase 3 study included RBC-TD pts (≥ 2 units packed RBCs [pRBCs]/28 days in the 112 days immediately prior to randomization) with IPSS Low/Int-1-risk MDS without del(5q), who were unresponsive or refractory to ESAs (RBC-TD despite ESA treatment with adequate dose and duration, or serum erythropoietin [EPO] > 500 mU/mL). Pts were randomized 2:1 to oral LEN 10 mg once daily (5 mg for pts with creatinine clearance 40–60 mL/min) or PBO. Pts with RBC-TI ≥ 56 days or erythroid response by Day 168 continued double-blind treatment until erythroid relapse, disease progression, unacceptable toxicity, or consent withdrawal. The primary endpoint was RBC-TI ≥ 56 days (defined as absence of any RBC transfusions during any 56 consecutive days). Secondary endpoints included time to RBC-TI, duration of RBC-TI, RBC-TI ≥ 168 days, progression to acute myeloid leukemia (AML; WHO criteria), overall survival (OS), and safety. Baseline bone marrow gene expression profiles were evaluated according to the Ebert signature (PloS Med 2008;5:e35) identified as predictive of LEN response. Clinical trial identifier: CT01029262. Results: The intent-to-treat population comprises 239 pts (LEN, n = 160; PBO, n = 79). Baseline characteristics were comparable across treatment groups; median age 71 years (range 43–87), 67.8% male, and median time from diagnosis 2.6 years (range 0.1–29.6). Pts received a median of 3.0 pRBC units/28 days (range 1.5–9.8) and 83.7% received prior therapy, including ESAs (78.7%). Significantly more LEN pts achieved RBC-TI ≥ 56 days versus PBO (26.9% vs 2.5%; P < 0.001; Table). The majority (90%) of pts with RBC-TI ≥ 56 days responded within 16 weeks of treatment. Median duration of RBC-TI ≥ 56 days was 8.2 months (range 5.2–17.8). Baseline factors significantly associated with achievement of RBC-TI ≥ 56 days with LEN were: prior ESAs (vs no ESAs; P = 0.005), serum EPO ≤ 500 mU/mL (vs > 500 mU/mL; P = 0.015), < 4 pRBC units/28 days (vs ≥ 4 pRBC units/28 days; P = 0.036), and female sex (vs male; P = 0.035). RBC-TI ≥ 168 days was achieved in 17.5% and 0% of pts in the LEN and PBO groups, respectively. The incidence of AML progression (per 100 person-years) was 1.91 (95% CI 0.80–4.59) and 2.46 (95% CI 0.79–7.64) for LEN and PBO pts, respectively, with median follow-up 1.6 and 1.3 years. Death on treatment occurred in 2.5% of pts on either LEN or PBO. The follow-up period was insufficient to permit OS comparison between the 2 groups. Myelosuppression was the main adverse event (AE); in the LEN versus PBO groups, respectively, grade 3–4 neutropenia occurred in 61.9% versus 11.4% of pts, and grade 3–4 thrombocytopenia in 35.6% versus 3.8% of pts. Discontinuations due to AEs were reported in 31.9% LEN and 11.4% PBO pts; among the 51 LEN pts who discontinued due to AEs, 14 discontinuations were due to thrombocytopenia and 8 due to neutropenia. In the subset of pts evaluated for the Ebert signature (n = 203), the predictive power of the signature was not confirmed. Conclusions: LEN therapy was associated with a significant achievement of RBC-TI ≥ 56 days in 26.9% of pts with a median duration of RBC-TI of 8.2 months; 90% of pts responded within 16 weeks of treatment. These data were consistent with response rates seen in the MDS-002 trial. The overall safety profile was consistent with the known safety profile of LEN and these data suggest LEN can be safely and effectively used in this patient population. Figure 1 Figure 1. Disclosures Santini: Celgene Corporation: Honoraria; Janssen: Honoraria; Novartis: Honoraria; Glaxo Smith Kline: Honoraria. Off Label Use: Trial of Lenalidomide in non-del5q MDS. Almeida:Celgene Corporation: Consultancy, Speakers Bureau. Giagounidis:Celgene Corporation: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees. Vey:Celgene: Honoraria. Mufti:Celgene: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding. Buckstein:Celgene: Research Funding. Mittelman:Celgene: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding, Speakers Bureau. Platzbecker:Celgene: Research Funding. Shpilberg:Celgene Corporation: Consultancy, Honoraria. del Canizo:Celgene Corporation: Consultancy, Research Funding. Gattermann:Celgene: Honoraria, Research Funding; Novartis: Honoraria, Research Funding. Ozawa:Celgene: Consultancy, not specified Other. Zhong:Celgene: Employment, Equity Ownership. Séguy:Celgene: Employment, Equity Ownership. Hoenekopp:Celgene: Employment, Equity Ownership. Beach:Celgene: Employment, Equity Ownership. Fenaux:Novartis: Research Funding; Janssen: Research Funding; Celgene: Research Funding.
Books on the topic "Duo mei ti"
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ke, Wang, and Yin jing qi. Duo mei ti ji shu. Bei jing: Ji xie gong ye chu ban she, 2006.
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bin, Li shao, Song yan yan, and Yuan wen biao. Duo mei ti ying yong ji shu. Bei jing: Qing hua ta xue chu ban she, 2011.
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chuan, Zhang xiao, and Shao gui fang. Duo mei ti shi yong ji shu. Bei jing: Dian zi gong ye chu ban she, 2005.
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Ruyu, Song, ed. Duo mei ti Hua yu jiao xue. Xianbei Shi: Zheng zhong shu ju gu fen you xian gong si, 2011.
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Duo mei ti dian nao ru men. Taibei Shi: Ji feng zi xun gu fen yu xian gong si, 1994.
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Duo mei ti ji shu ying yong. 4th ed. Dalian: Da lian li gong da xue chu ban she, 2014.
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Li and Shi yuan chun. Duo mei ti ji shu jiao cheng. Bei jing: Ji xie gong ye chu ban she, 2007.
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Yixin, Mao. Duo mei ti ji shu yu ying yong. Beijing: Ren min you dian chu ban she, 2007.
Find full textConference papers on the topic "Duo mei ti"
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Silva, Gabriel Afonso Pantoja da, Raimundo Viégas Junior, and Antonilson da Silva Alcantara. "Uma Proposta de Gamificação para Avaliação Contínua na Graduação em Cursos de Tecnologia da Informação (TI)." In Anais Estendidos do Simpósio Brasileiro de Games e Entretenimento Digital. Sociedade Brasileira de Computação, 2021. http://dx.doi.org/10.5753/sbgames_estendido.2021.19719.
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Este artigo foca em propor uma gamificação para estimar o grau de aprendizagem dos alunos, por meio de um estilo híbrido misturando tabuleiro e quiz game. Esta abordagem incorpora o mecanismo clássico utilizado em gamificação conhecido como PBL (Points, Medals and Leaderboards). Esperamos que este projeto implementando os mecanismos da gamificação melhorem substancialmente aspectos como: participação, contribuição, colaboração e obtenção do conhecimento no processo de aprendizagem, e por fim, no futuro realizar testes em ambiente real nas turmas de disciplinas dos cursos de Ciência da Computação e Sistemas de Informação de uma Universidade Pública Federal.
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Lelis, Claudio, Lourenço Pereira, and Cesar Marcondes. "Uma abordagem de detecção de atividade maliciosa em ambientes hospitalares." In Anais Principais do Simpósio Brasileiro de Computação Aplicada à Saúde. Sociedade Brasileira de Computação - SBC, 2020. http://dx.doi.org/10.5753/sbcas.2020.11529.
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A complexidade do ambiente hospitalar e os recursos escassos constituem desafios enfrentados pelos gestores de TI e de segurança cibernética. O setor da Saúde vem recebendo cada vez mais atenção, sofrendo com atividades maliciosas que levam a violação de dados sensíveis. Este artigo apresenta uma abordagem para detectar atividade maliciosa em ambiente hospitalar por meio de classificador baseado em Árvore de Decisão. O modelo foi treinado com dados de simulações executadas a partir da dinâmica de sistemas de ambiente hospitalar. Foram conduzidos experimentos de avaliação, utilizando o f1-score como métrica, com resultados satisfatórios onde o classificador tende a convergir a partir de 100 réplicas de simulação.
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He, Yuhao, Drew Burkhalter, David Durocher, and James M. Gilbert. "Solid-Lattice Hip Prosthesis Design: Applying Topology and Lattice Optimization to Reduce Stress Shielding From Hip Implants." In 2018 Design of Medical Devices Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/dmd2018-6804.
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The goal of this study was to construct a design methodology for a prosthesis which causes less stress shielding and meets fatigue requirements. Stress shielding is the reduction in bone stresses due to the introduction of an implant. Implants may become loose when stress shielding is present because bone resorption occurs as the bone adapts to the reduced bone stresses. Topology and lattice optimization were performed using OptiStruct to design a hip prosthesis where stress shielding and prosthesis fatigue were considered. The optimized design reduced stress shielding by 50+% when compared to a conventional generic implant, and the fatigue life met the ISO standards. Additionally, manufacturability was considered in the design process and a Ti-6Al-4V prototype was printed with an EOS selective laser melting machine.
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Haque, Mohammad Shafinul, Edel Arrieta, Jorge Mireles, Cesar Carrasco, Calvin M. Stewart, and Ryan B. Wicker. "Mechanical Behavior and Microstructure of Electron Beam Melted Ti-6Al-4V Using Digital Image Correlation." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66178.
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The reputation of additive manufacturing technology has increased dramatically in recent years due to its freedom of design, customization, and waste minimization. The growing demand for complex profile components to achieve more economic and strength-to-weight efficient aero-engine components can be met by additive manufacturing technology. In this study, electron beam melting (EBM), a powder bed additive layer manufacturing process, is used to manufacture Ti-6Al-4V tensile specimens. The Ti-6AL-4V alloy has excellent corrosion and high temperature resistance with a high strength-to-weight ratio. It is widely used in the power generation, aerospace, and medical industries. An Arcam Ti-6Al-4V prealloyed powder with particle sizes ranging from 45μ–100μ is used in an Arcam A2 machine to manufacture three specimens at zero degree manufacturing orientation. The zero degree manufacturing orientation is expected to exhibit a higher strength over other orientations. The EBM manufacturing parameters were set at 15mA current and 4530 mm/sec beam speed. Tensile tests were performed at room temperature (25.5°C) under a strain rate of 0.003 mm/mm/min according to the ASTM E8 standard for strain-rate sensitive materials. Stress-strain curves are plotted and discussed. Tensile test results indicate a tensile strength of 1.2 GPa and an elongation of 8% approximately. Three Dimensional Digital Image Correlation (3D-DIC) is used to measure the full strain field and deformation evolution on the surface of the specimens. The 3D-DIC system compares digital photographs (taken at two different angles simultaneously) of the surface of a specimen and calculates the deformation and strain fields. Using the strain fields the mechanical properties are determined by the relationships in the strain tensor. The tensile test results show that for a zero degree manufacturing orientation, the yield strength (YS) and ultimate tensile strength (UTS) are higher than that typically reported for wrought products. Fractography using optical microscopy (OM) and Scanning Electron Microscopy (SEM) were conducted. Micrographs of transverse section of the specimen were obtained to identify and analyze the failure mechanism that took place during testing. The built direction, presence of voids, manufacturing defects, and unmelted particles are observed from the SEM views. Surface roughness and microstructure were observed in the OM. A comparison of the obtained results with the literature for additively manufactured Ti-6Al-4V and possible causes are discussed.
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Eiselt, Charles C., David T. Hoelzer, Yann de Carlan, Hieronymus Hein, Marta Serrano, Pascal Diano, Herbert Schendzielorz, and Andreas Seubert. "Comparison of Fracture Toughness Properties of Advanced Ferritic ODS-Alloys Based on 0.2T C(T) Specimen Tests." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63455.
Full textAbstract:
Based on the good experiences gained by using small specimens made of ferritic RPV materials, the Master Curve fracture toughness approach was applied to determine the fracture mechanical properties of oxide dispersion strengthened (ODS-) materials. A ferritic ODS-alloy (Fe-14Cr-1W-Ti-Y2O3) has been produced through the powder metallurgical production path via hot extrusion and hot isostatic pressing (HIP). Optimized oxide dispersion strengthened (ODS)-alloys have a promising potential to meet the foreseen requirements of components in future Gen IV power plants due to their high creep strength and swelling resistance under irradiation at elevated operational temperatures. The fracture toughness was characterized with mini 0.2T C(T) specimens in different material orientations (R-L / L-R) in the ductile-brittle and upper shelf region in the un-irradiated state, accounting especially for the ODS-material’s anisotropy as one key effect of manufacturing. Despite all tests were performed in orientation required by ASTM standards E 1921 and E 1820 not all validity criteria (e.g. height of yield strength, evenness of the crack, admissible K during testing or admissible stable crack growth) were met by the ODS-material: consequently, a valid T0 value and a standard-compliant Master Curve could not be determined for the ODS-material in the transition region especially in the respective R-L orientation, also due to a comparably low fracture toughness over the whole evaluated temperature range. Promising fracture toughness properties were obtained in the crack growth direction perpendicular to the prior main deformation (extrusion) direction, where a KJQ value of 196 MPa√m at T = 22°C was measured. Within the ductile regime, only a JQ = J0.2BL technical initiation toughness value could be calculated and at T = 22°C, a comparably large JQ of 137kJ/m2 is obtained for specimens with crack growth direction perpendicular to the extrusion direction, while in extrusion direction the toughness is again low. In addition two further ODS-materials (14YWT and PM2000) were tested and compared to the alloys above. Non-conformances of ODS relating to the material requirements in ASTM standards E1921 and E1820 were finally detected and explained.