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The impact of raw material properties and process conditions on the color of a powdered formulated detergent product
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作者 Mohamed S. Manga David Willis +1 位作者 Nurafiqah M. Ali David W. York 《颗粒学报:英文版》 SCIE EI CAS CSCD 2019年第4期35-41,共7页
The appearance of deterge nt powder plays an importa nt role in con sumer perception of powder effectiveness for cleaning applications. In this study, we investigated the influence of numerous formulation and processi... The appearance of deterge nt powder plays an importa nt role in con sumer perception of powder effectiveness for cleaning applications. In this study, we investigated the influence of numerous formulation and processing conditions on product discoloration. Product color was scrutinized using the L*a*b* color space, and in particular, L* and b*. Particle size, the method for introducing the optical brightener, and the raw material grade were very important in con trolling the optical properties of detergent granules. As the particle size decreased, the light reflected to the observer appeared brighter and bluer. This was observed as increased whiteness from L*= 84.03 with a particle size of >841 μm to L*= 90.59 with a particle size of <250 μm. Reducing the level of impurities found in the raw materials by changing the material source also improved color definition. A key finding is that the optical brightener should be applied by spraying and prepared by dispersion rather than dissolution. This improves the distribution within the granules and increases the whiteness when compared with pouring the brightener into the agglomeration vessel. Additional spray applications highlighted that brightener on the granule surface influenced whiteness more than embedded brightener. In addition, we report on the effects of the drying temperature and mixer impeller speed on powder color. 展开更多
关键词 DETERGENT POWDER POWDER processing POWDER DISCOLORATION Optical BRIGHTENER Characterization
Mechanical Properties of Reactive Powder Concretes Produced Using Pumice Powder
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作者 Abdurrezzak BAKIS Ercan ISIK +1 位作者 Alev Akilli EL MustafaüLKER 《武汉理工大学学报:材料科学英文版》 SCIE EI CAS 2019年第2期353-360,共8页
We examined the applicability of the pumice aggregate on the concrete formed by considering the reactive powder concrete mixture ratios, for the rigid superstructure concrete road pavement and building construction. T... We examined the applicability of the pumice aggregate on the concrete formed by considering the reactive powder concrete mixture ratios, for the rigid superstructure concrete road pavement and building construction. The natural pumice aggregate in fibrous and non-fibrous concrete samples was used in the production of concrete by fracturing in 0.1-0.6 mm dimensions in rotor mill. The concreted formed in this way is named after the pumice powder concrete(PPC). The PPC samples produced were taken 7 days as 20 ℃ standard water cure, 28 days as 20 ℃ standard cure and 9 different types of combined cures. The combined cures were applied different temperatures in different durations. PPC samples were subjected to some pressure and flexural tests at the end of the standard water and combined cures. The highest compressive and flexural strengths of PPC samples were obtained after the combined cures: 3 days in 20 ℃ as standard water curing + 2 days in 180 ℃ in drying-oven. The highest compressive strength of PPC samples without any fiber was found to be 47.27 MPa, as for the highest flexural strength, it is found to be 5.23 MPa, in the end of the study. The highest compressive strength of fibrous PPC samples was 51.12 MPa, while flexural strength was 6.57 MPa. 展开更多
关键词 reactive POWDER CONCRETE (RPC) PUMICE POWDER CONCRETE (PPC) combined CURE compressive STRENGTH FLEXURAL STRENGTH
Grain boundary and microstructure engineering of Inconel 690 cladding on stainless-steel 316L using electron-beam powder bed fusion additive manufacturing
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作者 I.A. Segura L.E. Murr +7 位作者 C.A. Terrazas D. Bermudez J. Mireles V.S.V. Injeti K. Li B. Yu R.D.K.Misra R.B. Wicker 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第2期351-367,共17页
This research explores the prospect of fabricating a face-centered cubic(fcc) Ni-base alloy cladding(Inconel 690) on an fcc Fe-base alloy(316 L stainless-steel) having improved mechanical properties and reduced sensit... This research explores the prospect of fabricating a face-centered cubic(fcc) Ni-base alloy cladding(Inconel 690) on an fcc Fe-base alloy(316 L stainless-steel) having improved mechanical properties and reduced sensitivity to corrosion through grain boundary and microstructure engineering concepts enabled by additive manufacturing(AM) utilizing electron-beam powder bed fusion(EPBF). The unique solidification and associated constitutional supercooling phenomena characteristic of EPBF promotes[100] textured and extended columnar grains having lower energy grain boundaries as opposed to random, high-angle grain boundaries, but no coherent {111} twin boundaries characteristic of conventional thermo-mechanically processed fcc metals and alloys, including Inconel 690 and 316 L stainless-steel.In addition to [100] textured grains, columnar grains were produced by EPBF fabrication of Inconel 690 claddings on 316 L stainless-steel substrates. Also, irregular 2–3 μm diameter, low energy subgrains were formed along with dislocation densities varying from 108 to 109 cm2, and a homogeneous distribution of Cr23C6 precipitates. Precipitates were formed within the grains(with 3 μm interparticle spacing),but not in the subgrain or columnar grain boundaries. These inclusive, hierarchical microstructures produced a tensile yield strength of 0.527 GPa, elongation of 21%, and Vickers microindentation hardness of 2.33 GPa for the Inconel 690 cladding in contrast to a tensile yield strength of 0.327 GPa, elongation of 53%, and Vickers microindentation hardness of 1.78 GPa, respectively for the wrought 316 L stainlesssteel substrate. Aging of both the Inconel 690 cladding and the 316 L stainless-steel substrate at 685?C for50 h precipitated Cr23C6 carbides in the Inconel 690 columnar grain boundaries, but not in the low-angle(and low energy) subgrain boundaries. In contrast, Cr23C6 carbides precipitated in the 316 L stainless-steel grain boundaries, but not in the low energy coherent {111} twin boundaries. Consequently, the Inconel6 展开更多
关键词 Additive manufacturing ELECTRON-BEAM powder bed FUSION (EPBF) INCONEL 690 CLADDING 316L stainless steel Grain boundary engineering Materials characterization Mechanical properties
Laser additive manufacturing of Zn porous scaffolds;Shielding gas flow, surface quality and densification
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作者 Peng Wen Yu Qin +4 位作者 Yanzhe Chen Maximilian Voshage Lucas Jauer Reinhart Poprawe Johannes Henrich Schleifenbaum 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第2期368-376,共9页
Zn based metals have exhibited promising prospects as a structural material for biodegradable applications. Pure Zn porous scaffolds were produced by laser powder bed fusion(LPBF) based on data files of designing and ... Zn based metals have exhibited promising prospects as a structural material for biodegradable applications. Pure Zn porous scaffolds were produced by laser powder bed fusion(LPBF) based on data files of designing and CT scanning. Massive Zn evaporation during laser melting largely influenced the formation quality during LPBF of Zn metal. The metal vapor in processing chamber was blown off and suctioned out efficiently by an optimized gas circulation system. Numerical analysis was used to design and testify the performance of gas flow. The surface of scaffolds was covered with numerous particles in different sizes. Processing pores occurred near the outline contour of struts. The average grain size in width was8.5m, and the hardness was 43.8 HV. Chemical plus electrochemical polishing obtained uniform and smooth surface without processing pores, but the diameter of struts reduced to 250 αm from the design value 300 m. The poor surface quality and processing pores were resulted by the splashing particles included spatters and powders due to the recoil force of evaporation, and the horizontal movement of liquid metal due to overheating and wetting. The insufficient melting at the outline contour combined with good wetting of Zn liquid metal further increased the surface roughness and processing pores. 展开更多
关键词 ADDITIVE manufacturing Powder bed fusion LASER Porous SCAFFOLD ZN
High mechanical strengths and ductility of stainless steel 304L fabricated using selective laser melting
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作者 Q.B. Nguyen Z. Zhu +3 位作者 F.L. Ng B.W. Chu S.M.L. Nai J. Wei 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第2期388-394,共7页
Achieving not only high mechanical strengths but also high ductility is recently established using an additive manufacturing technique called selective laser melting. In the present study, stainless steel 304 L fully ... Achieving not only high mechanical strengths but also high ductility is recently established using an additive manufacturing technique called selective laser melting. In the present study, stainless steel 304 L fully dense samples were successfully printed using the 3 D systems – ProX 300 printing machine. The ductility and tensile yield strength were almost two and three times higher compared to those of ASTM cast’s alloy. Honey comb like nano-cellular structure with different orientation was observed in the fine grains(~4μm) due to fast cooling rate. In addition, the formation of martensite phase in random grains is also a contributor to the strengths. Furthermore, negative residual stresses in the build and horizontal directions were detected and assisted further increase in the tensile strength. Fractography revealed the ductile feature of plastic deformation and the crack openings at unmelted particles or pores. 展开更多
关键词 ADDITIVE manufacturing STAINLESS steel POWDER Selective laser MELTING
Ultra‐low cost Ti powder for selective laser melting additive manufacturing and superior mechanical properties associated 预览
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作者 Yuhang Hou Bin Liu +5 位作者 Yong Liu Yinghao Zhou Tingting Song Qi Zhou Gang Sha Ming Yan 《光电进展(英文)》 2019年第5期10-17,共8页
One of the bottleneck issues for commercial scale-up of Ti additive manufacturing lies in high cost of raw material, i.e. the spherical Ti powder that is often made by gas atomization. In this study, we address this s... One of the bottleneck issues for commercial scale-up of Ti additive manufacturing lies in high cost of raw material, i.e. the spherical Ti powder that is often made by gas atomization. In this study, we address this significant issue by way of powder modification & ball milling processing, which shows that it is possible to produce printable Ti powders based on ultra- low cost, originally unprintable hydrogenation-dehydrogenation (HDH) Ti powder. It is also presented that the as-printed Ti using the modified powder exhibits outstanding mechanical properties, showing a combination of excellent fracture strength (~895 MPa) and high ductility (~19.0% elongation). 展开更多
关键词 selective laser melting POWDER modification hydrogenation-dehydrogenation (HDH) TI ball MILLING additive manufacturing
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Effect of TiB2 content on microstructure and properties of in situ Ti–TiB composites 预览
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作者 Harshpreet Singh Muhammad Hayat +2 位作者 Hongzhou Zhang Raj Das Peng Cao 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第7期915-924,共10页
This study determined the optimal concentration of titanium diboride (TiB2) particles for the development of in situ titanium– titanium boride (Ti–TiB) metal matrix composites (MMCs) prepared by a conventional powde... This study determined the optimal concentration of titanium diboride (TiB2) particles for the development of in situ titanium– titanium boride (Ti–TiB) metal matrix composites (MMCs) prepared by a conventional powder metallurgy route to be used for industrial applications. The effect of concentration of TiB2 particles was studied by reinforcing TiB2 powder in different mass fractions (2wt%, 5wt%, 10wt%, and 20wt%) into pure Ti powder during the fabrication process. The MMCs were sintered at high temperatures under vacuum. The transmission electron microscopy (TEM) results revealed the formation of needle-shaped TiB whiskers, indicating that in situ reaction occurred during vacuum sintering of the powder compacts. All the composite samples had a high sintered density, and the hardness of the composites increased with an increase in the mass fraction of reinforcement. Mechanical and tribological properties such as flexural strength, impact, and wear properties were determined and found to be dependent on the mass fraction of the reinforcement. However, the mechanism for the in situ reaction needs further investigation by high-energy in situ X-ray diffraction techniques. 展开更多
关键词 titanium matrix COMPOSITES powder METALLURGY X-ray DIFFRACTION mechanical properties wear
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聚丙烯装置产生细粉的影响形成原因及改善措施 预览
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作者 孙志明 李开贵 +1 位作者 宿相泽 李宏冰 《当代化工》 CAS 2019年第9期2098-2101,共4页
阐述了双环管液相本体法合成聚丙烯树脂工艺,环管反应器内的丙烯在催化剂作用下迚行聚合反应生产聚丙烯,随着反应的迚行系统中生成一定量的聚丙烯粉末。分析了聚丙烯粉末对装置安全稳定生产造成的影响和粉末产生的主要原因。提出了相应... 阐述了双环管液相本体法合成聚丙烯树脂工艺,环管反应器内的丙烯在催化剂作用下迚行聚合反应生产聚丙烯,随着反应的迚行系统中生成一定量的聚丙烯粉末。分析了聚丙烯粉末对装置安全稳定生产造成的影响和粉末产生的主要原因。提出了相应的改善措施,降低装置粉末的生成量,保证聚丙烯装置安全稳定长周期运行。 展开更多
关键词 反应 粉末 生产 控制
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粉料微量给料装置研究现状 预览
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作者 邱格 董晓萌 +3 位作者 宋楠 曲婷婷 童瑄 李全来 《机电工程技术》 2019年第1期24-26,共3页
在粉末冶金、精细陶瓷、制药等行业中,常需要使用给料装置定量输送细粉。介绍现有粉料定量给料装置的结构组成、特点、优劣之处以及当前的研究现状,分析粉料定量给料装置的发展趋势,为细粉料定量给料装置的研发提供参考。
关键词 粉料 定量 给料器 研究现状
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The Influence of Third-party Evaluation on the Development of Detergent Products in China 预览
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作者 Shi Rongying Shi Aiqin 《日用化学品科学(英文版)》 2019年第2期24-30,共7页
The development and function of the third-party testing platform and the evaluation of detergent products by domestic professional third-party evaluation organizations were summarized. The evaluation methods and index... The development and function of the third-party testing platform and the evaluation of detergent products by domestic professional third-party evaluation organizations were summarized. The evaluation methods and indexes of hand washing dish detergent and fabric detergent by different third-party evaluation organizations were also concluded. The influence of third-party evaluation on the development of detergent products in China is presented. 展开更多
关键词 DISH DETERGENT LAUNDRY DETERGENT LAUNDRY POWDER third-party evaluation
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Influence of Precursor Powder Fabrication Methods on the Superconducting Properties of Bi-2223 Tapes
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作者 崔利军 张平祥 +7 位作者 闫果 冯勇 刘向宏 李建峰 潘熙锋 张胜楠 马小波 李金山 《中国物理快报:英文版》 SCIE CAS CSCD 2019年第2期59-63,共5页
Bi-2223 precursor powders are prepared by both oxalate co-precipitation(CP) and spray pyrolysis(SP) methods.The influence of fabrication methods on the superconducting properties of Bi-2223 tapes are systematically st... Bi-2223 precursor powders are prepared by both oxalate co-precipitation(CP) and spray pyrolysis(SP) methods.The influence of fabrication methods on the superconducting properties of Bi-2223 tapes are systematically studied. Compared to the CP method, SP powder exhibits spherical particle before calcination and smaller particle size after calcinations with more uniform chemical composition, which leads to a lower reaction temperature during calcination process for Bi-2223 tapes. Meanwhile, the non-superconducting phases in SP powder are more uniformly distributed with smaller particle sizes. These features result in finer homogeneity of critical current in large-length of Bi-2223 tape, higher density of filaments and better texture after heat treatment. Therefore,the SP method could be considered as a better route to prepare precursor powder for large-length Bi-2223 tape fabrication. 展开更多
关键词 PRECURSOR POWDER FABRICATION Methods SUPERCONDUCTING Properties BI-2223 TAPES
中药散剂研究的现状 预览
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作者 周欣欣 罗贤强 +3 位作者 张俊清 张旭光 李秀敏 赖伟勇 《海南医学》 CAS 2019年第3期392-394,共3页
散剂是中药的传统剂型,具有易吸收、起效快、制作工艺简单等特点。在我国用药历史上有着不可替代的优势。本文检索了近年来国内外学者对散剂研究的文献,对散剂研究的现状进行了综述,介绍了散剂的新形式与新技术。
关键词 散剂 煮散颗粒 中药分散片 超微粉碎 中药粒子设计
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大豆异黄酮纳米粉体的反溶剂法制备及表征 预览
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作者 张晓南 普楠 +5 位作者 张潇元 吴长玲 施珩 王中江 江连洲 杨秋萍 《中国食品学报》 EI CAS CSCD 北大核心 2019年第9期103-108,共6页
以二甲基亚砜作为溶剂,丙酮为反溶剂制备大豆异黄酮纳米粉体。通过正交试验设计法,以大豆异黄酮粒径为指标,对各个影响因素和水平进行研究,得到最佳的试验条件。结果:大豆异黄酮的纳米粒径与溶液体积比、匀浆器转速、溶液浓度呈反比,与... 以二甲基亚砜作为溶剂,丙酮为反溶剂制备大豆异黄酮纳米粉体。通过正交试验设计法,以大豆异黄酮粒径为指标,对各个影响因素和水平进行研究,得到最佳的试验条件。结果:大豆异黄酮的纳米粒径与溶液体积比、匀浆器转速、溶液浓度呈反比,与反应时间呈正比。大豆异黄酮的最佳试验条件为:溶液质量浓度300mg/mL,转速1200r/min,溶剂与反溶剂的体积比1∶6,反应时间3min。在该条件下得到的纳米大豆异黄酮粒径为98nm。通过扫描电镜(SEM)观测粒子外观,并用粉体堆密度方法统计。通过红外光谱(FT-IR)、差热扫描(DSC)等方法对制备的粉体进行物理化学性质表征。结果表明:制备前、后大豆异黄酮的粉体化学性质没有发生改变,纳米大豆异黄酮颗粒分布均匀,粒径显著减小。 展开更多
关键词 大豆异黄酮 微细粉体 反溶剂 表征 粒径
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Comparison of Hemospray■ and Endoclot^TM for the treatment of gastrointestinal bleeding 预览
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作者 Francesco Vitali Andreas Naegel +5 位作者 Raja Atreya Steffen Zopf Clemens Neufert Juergen Siebler Markus F Neurath Timo Rath 《世界胃肠病学杂志:英文版》 SCIE CAS 2019年第13期1592-1602,共11页
BACKGROUND Gastrointestinal (GI) bleeding is a common indication for endoscopy. For refractory cases, hemostatic powders (HP) represent “touch-free” agents. AIM To analyze short term (ST-within 72 h-) and long-term ... BACKGROUND Gastrointestinal (GI) bleeding is a common indication for endoscopy. For refractory cases, hemostatic powders (HP) represent “touch-free” agents. AIM To analyze short term (ST-within 72 h-) and long-term (LT-within 30 d-) success for achieving hemostasis with HP and to directly compare the two agents Hemospray (HS) and Endoclot (EC). METHODS HP was applied in 154 consecutive patients (mean age 67 years) with GI bleeding. Patients were followed up for 1 mo (mean follow-up: 3.2 mo). RESULTS Majority of applications were in upper GI tract (89%) with following bleeding sources: peptic ulcer disease (35%), esophageal varices (7%), tumor bleeding (11.7%), reflux esophagitis (8.7%), diffuse bleeding and erosions (15.3%). Overall ST success was achieved in 125 patients (81%) and LT success in 81 patients (67%). Re-bleeding occurred in 27% of all patients. In 72 patients (47%), HP was applied as a salvage hemostatic therapy, here ST and LT success were 81% and 64%, with re-bleeding in 32%. As a primary hemostatic therapy, ST and LT success were 82% and 69%, with re-bleeding occurring in 22%. HS was more frequently applied for upper GI bleeding (P = 0.04) CONCLUSION Both HP allow for effective hemostasis with no differences in ST, LT success and re-bleeding. 展开更多
关键词 Hemostatic POWDER GASTROINTESTINAL BLEEDING Hemospray Endoclot HAEMOSTASIS
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More Benefits of Oral Administration of Arsenic-containing Qinghuang Powder Compared with Decitabine for High/Very-high Risk Myelodysplastic Syndrome 预览
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作者 朱千赜 肖海燕 +9 位作者 刘为易 全日城 唐旭东 吕妍 刘驰 李柳 王洪志 郭小青 麻柔 胡晓梅 《世界中西医结合杂志(英文)》 2019年第2期11-19,共9页
OBJECTIVE: To evaluated the benefits of oral administration of arsenic-containing Qinghuang Powder(QHP)compared with decitabine for patients with high/very-high(H/VH) risk myelodysplastic syndrome(MDS) according to th... OBJECTIVE: To evaluated the benefits of oral administration of arsenic-containing Qinghuang Powder(QHP)compared with decitabine for patients with high/very-high(H/VH) risk myelodysplastic syndrome(MDS) according to the Revised International Prognostic Score System. METHODS: The OS(mOS) rate, annual OS rate and progression to acute myeloid leukemia(AML) in patients with H/VH MDS treated with QHP(QHP group, n = 27) and decitabine(decitabine group, n = 20) were retrospectively analyzed. The effects of prognostic factors of age, proportion of bone marrow blast,peripheral blood cell count, karyotype and Charlson Comorbidity Index(CCI) on OS were further analyzed. RESULTS: The m OS rate of QHP group(29 months) was signi?cantly longer than that of the decitabine group(18 months)(P = 0.043). The OS rates of 1, 2, and 3 years were signi?cantly higher in the QHP group(88.9%, 59.3%, 29.6%) than that in the decitabine group(70%, 25%, and 5%)(P = 0.01). There was no signi?cant difference of 5-year OS rate between the 2 groups(P = 0.133).The effects of prognostic factors on mOS were further analyzed, and it was found that there was no signi?cant difference of m OS rate between the QHP group(29 months) and the decitabine group(21 months) in the patients with age 65 years old(P = 0.673). The mOS rate was signi?cantly longer in QHP group(28.5 months) than that in decitabine group(18 months) in the patients with age of < 65 years old(P = 0.04). The proportions of bone marrow blast cells with 10% or < 10% had no signi?cant effects on the mOS rate of patients in the 2 groups(P = 0.429, P = 0.183). In patients with HGB 80 g/L, mOS rate was signi?cantly longer in the QHP group(57 months) than that in the decitabine group(21 months)(P = 0.047), while in patients with HGB < 80 g/L, there was no signi?cant difference of mOS rate between the 2 groups(P = 0.265). In the patients with PLT < 50×10~9/L, the mOS rate was signi?cantly longer in the QHP group(33 months) than that in the decitabine group(16 months)(P = 0.028). In the patients wi 展开更多
关键词 MYELODYSPLASTIC syndrome Qinghuang Powder REALGAR ARSENIC DECITABINE Survival period
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Constructing two-scale network microstructure with nano-Ti5Si3 for superhigh creep resistance
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作者 Y.Jiao L.J.Huang +4 位作者 S.L.Wei H.X.Peng Q.An S.Jiang L.Geng 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第8期1532-1542,共11页
The improvement of mechanical properties must be achieved by designing and constructing more suitable microstructure,such as hierarchical microstructure.In order to significantly enhance the creep resistance of titani... The improvement of mechanical properties must be achieved by designing and constructing more suitable microstructure,such as hierarchical microstructure.In order to significantly enhance the creep resistance of titanium matrix composites(TMCs),two-scale network microstructure was constructed including the first-scale network(<150μm)with micro-TiB whisker(TiBw)reinforcement and the second-scale network(<30μm)with nano-Ti5Si3 reinforcement by powder metallurgy and in-situ synthesis.The results showed that the creep rate of the composite was remarkably reduced by an order of magnitude compared with the Ti6Al4V alloy at 550℃,600℃,650℃ under the stresses between 100 MPa and 350 MPa.Moreover,the rupture time of the composite was increased by 20 times,compared with that of the Ti6Al4 Valloy at 550℃/300 MPa.The superior creep resistance could be attributed to the hierarchical microstructure.The micro-TiBw reinforcement in the first-scale network boundary contributed to creep resistance primarily by blocking grain boundary sliding,while the nano-Ti5Si3 particle in the second-scale network boundary mainly by hindering phase boundary sliding.In addition,the nano-Ti5Si3 particle was dissolved,and precipitated with smaller size than the primary Ti5Si3.This phenomenon was attributed to Si element diffusion under high temperature and external stress,which could further continuously enhance the creep resistance.Finally,the creep rate during steady-state stage was significantly decreased,which manifested superior creep resistance of the composite. 展开更多
关键词 Titanium matrix composite TWO-SCALE NETWORK MICROSTRUCTURE Nano-Ti5Si3 Creep Powder METALLURGY
Development of a Powder Extruder System for Dual-pore Tissue-engineering Scaffold Fabrication
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作者 Nae-Un Kang Myoung Wha Hong +2 位作者 Young Yul Kim Young-Sam Cho Seung-Jae Lee 《仿生工程学报:英文版》 SCIE EI CSCD 2019年第4期686-695,共10页
In this study,we developed a powder extruder system that can extrude and deposit powder mixtures to overcome the reported limitations of conventional dualpore scaffold manufacturing methods.To evaluate the extrusion a... In this study,we developed a powder extruder system that can extrude and deposit powder mixtures to overcome the reported limitations of conventional dualpore scaffold manufacturing methods.To evaluate the extrusion and deposition capability of the powder extruder system,3D tissue-engineering scaffolds with dual-pore characteristics were fabricated with a PCL/PEO/NaCl(polycaprolactone/polyethylene oxide/sodium chloride)powder mixture.In addition,to evaluate the fabricated scaffolds,their compressive modulus,morphology,and in-vitro cell activity were assessed.Consequently,it was confirmed that the proposed powder extruder system can fabricate dual-pore scaffolds with well-interconnected pores as well as arbitrary 3D shapes shown by the fabrication of a 3D femur-shape scaffold similar to the femur model.The results of the cell proliferation and Cell Counting Kit-8(CCK-8)assays,DNA content analysis and viability assays confirm that the dual-pore scaffold fabricated by the powder extruder system improves cell attachment,proliferation,and viability. 展开更多
关键词 dual-pore SCAFFOLD POWDER EXTRUDER system polycaprolactone 3D TISSUE-ENGINEERING SCAFFOLD
Manufacturing cost constrained topology optimization for additive manufacturing
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作者 Jikai LIU Qian CHEN +1 位作者 Xuan LIANG Albert C.TO 《机械工程前沿:英文版》 CSCD 2019年第2期213-221,共9页
This paper presents a manufacturing cost constrained topology optimization algorithm considering the laser powder bed additive manufacturing process.Topology optimization for additive manufacturing was recently extens... This paper presents a manufacturing cost constrained topology optimization algorithm considering the laser powder bed additive manufacturing process.Topology optimization for additive manufacturing was recently extensively studied,and many related topics have been addressed.However,metal additive manufacturing is an expensive process,and the high manufacturing cost severely hinders the widespread use of this technology.Therefore,the proposed algorithm in this research would provide an opportunity to balance the manufheturing cost while pursuing the superior structural perfonnance through topology optimization.Technically,the additive manufacturing cost model for laser powder bed-bascd process is established in this paper and real data is collected to support this model.Then,this cost model is transformed into a level set function-based expression,which is integrated into the level set topology optimization problem as a constraint.Therefore,by properly developing the sensitivity result,the metallic additive manufocturing part can be optimized with strictly constrained manufacturing cost.Effectiveness of the proposed algorithm is proved by numerical design examples. 展开更多
关键词 TOPOLOGY optimization MANUFACTURING COST ADDITIVE MANUFACTURING powder BED
Study on the Cutting Propagation Technique of Himalayan Leycesteria formosa Wall. Twigs 预览
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作者 Xuesen LIU Yi GAO +1 位作者 Yu HUANG Zhen XING 《药用植物研究(英文版)》 2019年第4期76-79,共4页
[Objectives] The study aimed to protect the good germplasm resources of Himalayan Leycesteria formosa Wall. and produce a large number of L. formosa plants used in Tibetan garden landscape.[Methods] In the intelligent... [Objectives] The study aimed to protect the good germplasm resources of Himalayan Leycesteria formosa Wall. and produce a large number of L. formosa plants used in Tibetan garden landscape.[Methods] In the intelligent solar greenhouse, the effects of different concentrations of ABT2 rooting powder on the cutting propagation of L. formosa twigs were studied, and the effects of different matrices on the growth of the cutting seedlings were analyzed.[Results] The effect of different concentrations of ABT2 rooting powder on the rooting rate of L. formosa is as follows: 200 mg/L>300 mg/L>100 mg/L, and the rooting rate is as follows: 61%>59%>57%. The rooting rate of L. formosa in the control group (CK) was 54%. The average number of roots and the average length of main root of L. formosa in the three treatments with ABT2 rooting powder were significantly different, while the average number of primary roots, average number of new branches, and average number of new leaves of L. formosa treated with 100 mg/L ABT2 rooting powder had no significant difference. There were significant differences between 200 and 300 mg/L ABT2 root powder treatments in the three growth indicators of L. formosa , and the promotion effects of 200 mg/L ABT2 rooting powder on the five indicators of L. formosa cuttings were better. The effects of different transplanting matrices on the indoor survival rate of L. formosa cutting seedlings were very obvious, and the survival rate of L. formosa cutting seedlings in matrix C was the highest, up to 96%. Different substrates had different effects on the growth of ground diameter of L. formosa cutting seedlings, and the promotion effect of matrix C was better.[Conclusions] In the rapid cutting propagation of good L. formosa , 200 mg/L ABT2 rooting powder can be selected. For indoor transplanting, matrix C (sandy soil+perlite+humus soil) should be used. 展开更多
关键词 Leycesteria formosa Wall. ABT2 ROOTING powder Matrix CUTTING PROPAGATION
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Earthworms: A Source of Protein 预览
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作者 Siyun Ding Xiting Lin Sanger He 《食品科学与工程:英文版(美国)》 2019年第5期159-170,共12页
Earthworms are important invertebrates that have been widely used as food and traditional medicine sources for thousands of years. Not only have researchers proven that earthworms are rich in proteins and other nutrie... Earthworms are important invertebrates that have been widely used as food and traditional medicine sources for thousands of years. Not only have researchers proven that earthworms are rich in proteins and other nutrients, they have also taken a keener interest in their unique pharmaceutical properties. Recent research has successfully discovered some beneficial functional components of earthworms due to the rapid development of biological technologies in the past decades. Therefore, earthworms could be a novel dietary supplement for human consumption. This review aims to summarize the current research about nutritional and therapeutic values of earthworms;and present a matured earthworm-derived product from Bocom Pharmaceuticals (USA) Corp as an example of its incorporation into a dietary supplement. 展开更多
关键词 EARTHWORM PROTEIN EARTHWORM POWDER Bocom.
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