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排序方式: 共有74条查询结果,搜索用时 15 毫秒
1.
Abbas Syed Zeeshan Ibrahim Haroon Khan Majid 《Multimedia Tools and Applications》2021,80(17):26069-26091
Multimedia Tools and Applications - In this article, we have designed a new information confidentiality mechanism based on the combination of Blowfish encryption algorithm along with Henon and Chen... 相似文献
2.
Musrat Ali Urooj Haroon Maria Khizar Hassan Javed Chaudhary Muhammad Farooq Hussain Munis 《Microscopy research and technique》2021,84(1):101-110
Citrus is the leading fruit crop of Pakistan and exported to different parts of the world. Due to suitable weather condition, this crop is affected by different biotic factors which seriously deteriorate its quality and quantity. During the months of November 2018 to January 2019, citrus brown rot symptoms were recurrently observed on sweet oranges in National Agricultural Research Centre (NARC), Islamabad. Causal agent of citrus brown rot was isolated, characterized, and identified as Fusarium oxysporum. For environment‐friendly control of this disease, leaf extract of Azadirachta indica was used for the green synthesis of iron oxide (Fe2O3) nanoparticles. These nanoparticles were characterized before their application for disease control. Fourier transform infrared spectroscopy (FTIR) of these synthesized nanoparticles described the presence of stabilizing and reducing compounds like alcohol, phenol, carboxylic acid, and alkaline and aromatic compounds. X‐Ray diffraction (XRD) analysis revealed the crystalline nature and size (24 nm) of these nanoparticles. Energy dispersive X‐Ray (EDX) analysis elaborated the presence of major elements in the samples. Scanning electron microscopy (SEM) confirmed the spinal shaped morphology of prepared nanoparticles. Successfully synthesized nanoparticles were evaluated for their antifungal potential. Different concentrations of Fe2O3 nanoparticles were used and maximum mycelial inhibition was observed at 1.0 mg/ml concentration. On the basis of these findings, it could be concluded that Fe2O3 nanoparticles, synthesized in the leaf extract of A. indica, can be successfully used for the control of brown rot of sweet oranges. 相似文献
3.
Area-wide surface topography is continuously monitored with the moiré technique, i.e. measurement of patterns formed by superposition of the warped image of a line grating on a similar reference grating. A simple method for reconstructing liquid film profiles from moirfringe patterns is developed. The method is tested with a known specimen, a convex lens. Leveling of an uneven liquid film by gravity and capillary force is followed and film profiles are measured at intervals of time. Waves flowing down an inclined plate and disturbances in a liquid curtain are viewed, as are small disturbances caused by the impingement of tiny surface-active particles. Possible application to control of coating operations is pointed out. 相似文献
4.
阿拉伯胶/白色玫瑰茄提取物复合涂膜对低温贮藏蓝莓保鲜效果的影响 总被引:1,自引:0,他引:1
为改善低温贮藏蓝莓果实易于腐败的问题,探讨一种可以改善蓝莓贮藏品质的保鲜处理方法。实验以‘兔眼’蓝莓品种为试材,在(4.0±0.5)℃、相对湿度75%的贮藏条件下,采用100 mg/mL阿拉伯胶+体积分数1.5%甘油(M1)、100 mg/mL阿拉伯胶+体积分数1.5%甘油+体积分数1.5%白色玫瑰茄提取物(white roselle extract,WRE)(M2)、100 mg/mL阿拉伯胶+体积分数1.5%甘油+体积分数2.5% WRE(M3)3 种可食性涂膜液对蓝莓样品进行涂膜处理,通过分析果实理化性质、抗氧化酶活力和抗氧化物质含量等指标的变化,探讨复合涂膜对低温贮藏蓝莓保鲜效果的影响。结果表明:在低温贮藏的条件下,阿拉伯胶复合涂膜可以显著减缓蓝莓果实质量损失、降低腐烂率和延缓硬度降低(P<0.05),并能维持果实较高的总酚、花色苷含量和较好的感官品质,显著抑制多酚氧化酶(polyphenol oxidase ,PPO)活力和降低果实表面褐变程度(P<0.05);且M3涂膜剂在抑制低温贮藏蓝莓果实PPO活力、维持果实总酚和花色苷含量、改善感官品质方面具有最佳效果。综合分析各项指标可得出,M3涂膜剂对低温贮藏蓝莓的保鲜效果最好。 相似文献
5.
6.
Khan Haroon Jan Mian Ahmad Alam Muhammad Dghais Wael 《Mobile Networks and Applications》2019,24(4):1306-1316
Mobile Networks and Applications - In Wireless Sensor Networks (WSNs), energy-efficient routing is required to conserve the scarce resources of these networks. Various energy-efficient routing... 相似文献
7.
8.
Haroon Ur Rasheed Xiaomeng Lv Suyun Zhang Wei Wei Nabi ullah Jimin Xie 《Advanced Powder Technology》2018,29(12):3305-3314
Today’s world, tetracycline hydrochloride (TC) is considered as a Compounds of Emerging Concern (CECs). Metal-organic frameworks MOFs with a microporous structure and holding larger pores indicating potential applications in the fields of environmental purification. Recently, carbon aerogel (CA) has also aroused great interest due to its larger specific surface area, low density, thermal stability, and non-toxicity. Herein, MIL-100(Fe) was synthesized under low temperature and combined with Fe3O4 and CA, respectively. The obtained MIL-100(Fe), MIL-100(Fe)@Fe3O4, MIL-100(Fe)@CA and MIL-100(Fe)@Fe3O4/CA were investigated as a photocatalyst for removal of TC from the water. The results indicated that the MIL-100(Fe)@Fe3O4/CA degrade TC up to 85%, which is much higher than MIL-100(Fe)@Fe3O4 (c.a. 42%), due to its high surface area 389?m2?g?1, smaller pore size and pore volume 2.4?nm and 0.319?m3?g?1, high separation of electron and hole, and lower band gap of 1.76?eV. The coupling of CA with MIL-100(Fe)@Fe3O4 considerably accelerate the transfer of photo-generated charge carriers and enhanced 1.6 times the performance of MIL-100(Fe)@Fe3O4. Furthermore, the stability and recyclability were enhanced due to the addition of Fe3O4, facilitating the environmentally friendly water purification processes. 相似文献
9.
Ahsan Nazir Haojie Yu Li Wang Muhammad Haroon Raja Summe Ullah Shah Fahad Kaleem-ur-Rahman Naveed Tarig Elshaarani Amin Khan Muhammad Usman 《Journal of Materials Science》2018,53(12):8699-8719
With the development in the modern technologies such as telecommunication instruments and scientific electronic devices, large amount of the electromagnetic radiations are produced, which lead to harmful effect on the highly sensitive electronic devices as well as on the health of human beings. To minimize the effect of electromagnetic radiations produced by different technologies, more efficient shielding materials are required which must be cost-effective, lightweight and good corrosion resistive. In this review, we focused on the shielding materials based on composites of carbon nanotubes and graphene. The typical surface modification of carbon nanotubes and graphene to optimize their interactions with polymers matrix has also summarized. It was found that the composites based on these carbon fillers were more efficient for electromagnetic interference shielding due to their unique properties (i.e., superior electrical, mechanical and thermal) together with lightweight, easy processing. Hence, the carbon nanotubes and graphene-based composites are excellent shielding materials against the electromagnetic radiations. 相似文献
10.
Carbon fibre–phenolic matrix (CF–P) composites containing graphene nanoplatelets (GNPs) were manufactured for improved mechanical and thermal properties. For comparison, micrometer-size pyrolytic graphite powder (GP) was also incorporated in CF–P composites. The loading of carbon fibres was kept constant at 60?wt-% while the quantity of GNPs was varied from 0.1?wt-% to 0.3?wt-% and GP from 1.0?wt-% to 3.0?wt-%. Only GNPs were functionalised by ultraviolet-ozone treatment to improve their dispersion in the matrix while all the composites were manufactured by hand layup method and characterised by scanning electron microscopy, impact, flexural, thermogravimetry and ablation tests. The composite containing 0.3?wt-% GNPs showed considerable improvement in ablation, flexural and impact testing as compared to CF-P composites containing GP. Finally, the ablation mechanisms of post-ablated composites were discussed in the light of available data in the literature. 相似文献