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排序方式: 共有159条查询结果,搜索用时 21 毫秒
21.
T Goldman AL Hallin CM Hoffman LE Piilonen D Preston RD Bolton MD Cooper JS Frank PA Heusi GE Hogan FG Mariam HS Matis RE Mischke VD Sandberg GH Sanders U Sennhauser R Werbeck RA Williams D Grosnick SC Wright SL Wilson R Hofstadter EB Hughes MW Ritter VL Highland J McDonough 《Canadian Metallurgical Quarterly》1987,36(5):1543-1546
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Lakshmanaperumal Sundarabharathi Mahendran Chinnaswamy Deepalekshmi Ponnamma Hemalatha Parangusan Mariam Al Ali Al-Maadeed 《Journal of the American Ceramic Society》2019,102(1):144-157
Dual doped calcium apatite has been widely focused as it enhances the osteoconductive property for the possible applications in orthopedic and dental implants. In this work, we investigate the antimicrobial and bioactive properties of cerium/strontium (Ce3+/Sr2+) co-substituted hydroxyapatite (HA) nanoparticles synthesized by sol-gel assisted precipitation method. The structure, morphology, functional groups, photoluminescence, and thermal stability of the developed systems are examined. The comparative studies performed among the pure HA, Sr2+, and Ce3+-substituted HA nanoparticles illustrate higher antibacterial activity with lowered apatite-forming ability and biocompatibility for the Ce3+-substituted HA. However, the Ce3+/Sr2+co-substituted HA exhibits better biocompatibility, apatite-forming ability, and good antimicrobial properties. Sr2+ ion inclusion leads to better biological properties and compromise the cytotoxic nature of the Ce3+-HA. In addition, the Ce3+/Sr2+-HA nanoparticles prevent thermal decomposition up to 700°C, pointing also toward the possibility of this co-substituted HA in bone implant applications. 相似文献
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24.
Kiran Mariam Wang Cong Papadimitriou George Mandal Anirban Deelman Ewa 《Machine Learning》2020,109(5):1127-1143
Machine Learning - Large-scale scientific workflows rely heavily on high-performance file transfers. These transfers require strict quality parameters such as guaranteed bandwidth, no packet loss... 相似文献
25.
Fumed SiO2 nanoparticle reinforced biopolymer blend nanocomposites with high dielectric constant and low dielectric loss for flexible organic electronics
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Kalim Deshmukh M. Basheer Ahamed Kishor Kumar Sadasivuni Deepalekshmi Ponnamma Mariam Al‐Ali AlMaadeed Rajendra R. Deshmukh S. K. Khadheer Pasha Anji Reddy Polu K. Chidambaram 《应用聚合物科学杂志》2017,134(5)
In the present study, fumed silica (SiO2) nanoparticle reinforced poly(vinyl alcohol) (PVA) and poly(vinylpyrrolidone) (PVP) blend nanocomposite films were prepared via a simple solution‐blending technique. Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–vis), X‐ray diffraction (XRD), and scanning electron microscopy (SEM) were employed to elucidate the successful incorporation of SiO2 nanoparticles in the PVA/PVP blend matrix. A thermogravimetric analyzer was used to evaluate the thermal stability of the nanocomposites. The dielectric properties such as dielectric constant (?) and dielectric loss (tan δ) of the PVA/PVP/SiO2 nanocomposite films were evaluated in the broadband frequency range of 10?2 Hz to 20 MHz and for temperatures in the range 40–150 °C. The FTIR and UV–vis spectroscopy results implied the presence of hydrogen bonding interaction between SiO2 and the PVA/PVP blend matrix. The XRD and SEM results revealed that SiO2 nanoparticles were uniformly dispersed in the PVA/PVP blend matrix. The dielectric property analysis revealed that the dielectric constant values of the nanocomposites are higher than those of PVA/PVP blends. The maximum dielectric constant and the dielectric loss were 125 (10?2 Hz, 150 °C) and 1.1 (10?2 Hz, 70 °C), respectively, for PVA/PVP/SiO2 nanocomposites with 25 wt % SiO2 content. These results enable the preparation of dielectric nanocomposites using a facile solution‐casting method that exhibit the desirable dielectric performance for flexible organic electronics. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44427. 相似文献
26.
Kalim Deshmukh M. Basheer Ahamed Kishor Kumar Sadasivuni Deepalekshmi Ponnamma Rajendra R. Deshmukh Ajinkya M. Trimukhe S. K. Khadheer Pasha Anji Reddy Polu Mariam Al-Ali AlMaadeed K. Chidambaram 《Journal of Polymer Research》2017,24(2):27
The recent surge in graphene research has stimulated interest in the investigation of various two-dimensional (2D) nanomaterials, including 2D boron nitride (BN) nanostructures. Among these, hexagonal boron nitride nanosheets (h-BNNs; also known as white graphene, as their structure is similar to that of graphene) have emerged as potential nanofillers for preparing thermally conductive composites. In this work, hexagonal boron nitride nanoparticles (h-BNNPs) approximately 70 nm in size were incorporated into a polyvinylidene fluoride (PVDF) matrix with different loadings (0–25 wt.%). The PVDF/h-BNNP nanocomposites were prepared by a solution blending technique and characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), polarized optical microscopy (POM) and scanning electron microscopy (SEM). In addition, the thermal conductivity and dielectric properties of the nanocomposites were investigated. The incorporation of h-BNNPs in the PVDF matrix resulted in enhanced thermal conductivity. The highest value, obtained at 25 wt.% h-BNNP loading, was 2.33 W/mK, which was five times that of the neat PVDF (0.41 W/mK). The thermal enhancement factor (TEF) at 5 wt.% h-BNNP loading was 78%, increasing to 468% at 25 wt.% h-BNNP loading. The maximum dielectric constant of approximately 36.37 (50Hz, 150 °C) was obtained at 25 wt.% h-BNNP loading, which was three times that of neat PVDF (11.94) at the same frequency and temperature. The aforementioned results suggest that these multifunctional and high-performance nanocomposites hold great promise for application in electronic encapsulation. 相似文献
27.
Recently a simple method was used for preparing nanowires MxV2O5 + ε·nH2O (MMg, Mn). It consists of mixing a boiling solution of vanadium oxide with the corresponding metal nitrate. In the present paper, this method was explored for preparing other nanowires layered MxV2O5 + ε·nH2O compounds (MTi, Cr, Fe, Co, Ni, Cu, and Zn). The results obtained show that If the precipitates are formed immediately after mixing the two solutions, such in case of titanium, chromium and iron, the structure and particles shape of the products are different from the layered compound MxV2O5 + ε·nH2O. However, if the precipitates start to appear only after several minutes of stirring, such in case of cobalt, nickel, copper and zinc, the phases obtained are similar to layered nanowires MxV2O5 + ε·nH2O. The amount of the metal inserted “M” was found to be lower than 25 at.% in all as-prepared samples. Nickel containing sample shows the highest inserted amount. 相似文献
28.
衬底温度对NiO:Cu/ZnO异质pn结的光电性能影响 总被引:1,自引:1,他引:0
利用磁控溅射方法改变衬底温度,制备了一系列Ni O:Cu/ZnO异质pn结。实验结果表明,当衬底温 度从室温升高到300℃时,NiO:Cu/ZnO异质pn结的整流特性明显得到 改善;与此同时,NiO:Cu/ZnO异质 pn结的光学透过率也从40%增大到80%。这可能是由于NiO:Cu薄膜结晶质量改善,薄膜内 缺陷减少所致。 继续增加衬底温度至400℃,异质结的整流特性有所削弱,这可能是 由于生长在异质结下层 的NiO:Cu薄膜影响了其上ZnO薄膜的生长,进而影响到异质结的整流特性。这一结论,得到 X射线衍射(XRD)、原子力显微镜(AFM)和紫外(UV)谱测试结果的支持。 相似文献
29.
Francesca Fanini Erika Bandini Meropi Plousiou Silvia Carloni Petra Wise Paolo Neviani Mariam Murtadha Flavia Foca Francesco Fabbri Ivan Vannini Muller Fabbri 《International journal of molecular sciences》2021,22(24)
Background: Non-small cell lung cancer (NSCLC) is the leading cause of cancer death worldwide. Chemotherapy, the treatment of choice in non-operable cases, achieves a dismal success rate, raising the need for new therapeutic options. In about 25% of NSCLC, the activating mutations of the KRAS oncogene define a subclass that cannot benefit from tyrosine kinase inhibitors (TKIs). The tumor suppressor miR-16 is downregulated in many human cancers, including NSCLC. The main objectives of this study were to evaluate miR-16 treatment to restore the TKI sensitivity and compare its efficacy to MEK inhibitors in KRAS-mutated NSCLC. Methods: We performed in vitro and in vivo studies to investigate whether miR-16 could be exploited to overcome TKI resistance in KRAS-mutated NSCLC. We had three goals: first, to identify the KRAS downstream effectors targeted by mir-16, second, to study the effects of miR-16 restoration on TKI resistance in KRAS-mutated NSCLC both in vitro and in vivo, and finally, to compare miR-16 and the MEK inhibitor selumetinib in reducing KRAS-mutated NSCLC growth in vitro and in vivo. Results: We demonstrated that miR-16 directly targets the three KRAS downstream effectors MAPK3, MAP2K1, and CRAF in NSCLC, restoring the sensitivity to erlotinib in KRAS-mutated NSCLC both in vitro and in vivo. We also provided evidence that the miR-16–erlotinib regimen is more effective than the selumetinib–erlotinib combination in KRAS-mutated NSCLC. Conclusions: Our findings support the biological preclinical rationale for using miR-16 in combination with erlotinib in the treatment of NSCLC with KRAS-activating mutations. 相似文献
30.
Liubov Shtykova Mariam Masuda Carina Eriksson Kristina Sjödin Elisabeth Marling Fredrik Schlyter Magnus Nydén 《Progress in Organic Coatings》2008
Latex-based coatings for protection of tree seedlings against pest insect feeding are evaluated with respect to surface-, mechanical-, and release properties and antifeedant activity. The latex dispersion Eudragit copolymer (EC) was used to form the coatings, 2,6-di-tert-butyl-4-methylphenol (BHT) and cis-dihydropinidine (Alk) as antifeedants, and a thickener and a alkylglucoside based nonionic surfactant were used as additives to optimize the release- and mechanical properties of coatings. Coating characterization was performed with respect to surface morphology (atomic force microscopy, AFM) and surface wetting (contact angle), as well as to mechanical (tensile stress- and tensile strain at break) properties. Surface smoothness and wettability as well as elasticity increased with addition of the surfactant. The optimized coatings were found to be elastic and water resistant at 3–6 wt.% of BHT and 3 wt.% of surfactant. BHT was released into SDS/water at very low rates. Several formulations of BHT and Alk were efficient in preventing the feeding on conifer bark by a pine insect, Hylobius abietis both in laboratory (no-choice) and in field (3 months) tests. 相似文献