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Competitive role of nitrogen functionalities of N doped GO and sensitizing effect of Bi_(2)O_(3)QDs on TiO_(2)for water remediation

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Journal of Environmental Sciences 2021年第10期33卷 107-119页

作者： saima noor Shamaila Sajjad Sajjad Ahmed Khan Leghari Cristina Flox Saeed Ahmad International Islamic University Islamabad 44000Pakistan Department of Chemistry and Materials Science Aalto UniversityEspoo 16100Fl-00076Finland Pakistan Institute of Engineering and Applied Sciences Islamabad 44000Pakistan Department of Applied Physics Aalto UniversityEspoo 15100Fl-00076Finland

The promising solar irradiated photocatalyst by pairing of bismuth oxide quantum dots(BQDs)doped TiO_(2)with nitrogen doped graphene oxide(NGO)nanocomposite(NGO/BQDs-TiO_(2))was *** was used for degradation of organic pollutants like 2,4-dichlorophenol(2,4-DCP)and stable dyes,*** B and Congo Red.X-ray diffraction(XRD)profile of NGO showed reduction in oxygenic functional groups and restoring of graphitic crystal *** characteristic diffraction peaks of TiO_(2)and its composites showed crystalline anatase TiO_(2).Morphological images represent spherical shaped TiO_(2)evenly covered with BQDs spread on NGO *** surface linkages of NO-O-Ti,C-O-Ti,Bi-O-Ti and vibrational modes are observed by Fourier transform infrared spectroscopy(FTIR)and Raman *** and NGO modified TiO_(2)results into red shifting in visible region as studied in diffused reflectance spectroscopy(DRS).NGO and BQDs in TiO_(2)are linked with defect centers which reduced the recombination of free charge carriers by quenching of photoluminescence(PL)intensities.X-ray photoelectron spectroscopy(XPS)shows that no peak related to C-O in NGO/BQDs-TiO_(2)is *** indicated that doping of nitrogen into GO has reduced some oxygen functional *** functionalities in NGO and photosensitizing effect of BQDs in ternary composite have improved photocatalytic activity against organic *** byproducts during photo degradation process of 2,4-DCP were studied through high performance liquid chromatography(HPLC).Study of radical scavengers indicated that O_(2)^(·-) has significant role for degradation of 2,*** investigations propose that fabricated nanohybrid architecture has potential for degradation of environmental pollutions.

关键词： Bi_(2)O_(3)quantum dots Nitrogen doped graphene oxide Nitrogen defects TiO_(2) 2,4-Dichlorophenol Water treatment

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用时空CE/SE方法求解微溶一维间歇结晶模型(英文)

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Chinese Journal of Chemical Engineering 2015年第2期23卷 337-341页

作者： saima noor Shamsul Qamar Department of Mathematics COMSATS Institute of Information Technology

This article is concerned with the numerical investigation of one-dimensional population balance models for batch crystallization process with fines *** batch crystallization,dissolution of smaller unwanted nuclei below some critical size is of vital importance as it improves the quality of *** crystal growth rates for both size-independent and size-dependent cases are considered.A delay in recycle pipe is also included in the *** space–time conservation element and solution element method,originally derived for non-reacting flows,is used to solve the *** scheme has already been applied to a range of PDEs,mainly in the area of fluid *** numerical results are compared with those obtained from the Koren scheme,showing that the proposed scheme is more efficient.

关键词：间歇结晶平衡模型一维空时求解晶体生长速率临界尺寸数值结果

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A Secure Image Steganography Using Advanced Encryption Standard and Discrete Cosine Transform

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Journal of Information Security 2019年第3期10卷 117-129页

作者： Ashraful Tauhid Maisha Tasnim saima Arifin noor Nuruzzaman Faruqui Mohammad Abu Yousuf Information & Communication Engineering Bangladesh University of Professionals Dhaka Bangladesh Institute of Information Technology Jahangirnagar University Dhaka Bangladesh

Cryptography and Steganography are two prominent techniques to obtain secure communication over the shared media like the Internet. Steganography is slightly ahead of cryptography because of its stealthy characteristics. In this paper, a new method has been proposed which combines cryptography and steganography to ensure even more secure communication. The Advanced Encryption Standard (AES) in spatial domain of the carrier/cover image and Least Significant Bit (LSB) replacement in the transformed domain of the same image has been used after performing a Discrete Cosine Transform (DCT) on the pixels. An additional layer of security has been introduced by applying XOR operation on the AES encrypted message with the pixel values of the carrier image. The Peak Signal to Noise Ratio (PSNR) of the proposed algorithm is better than most of the similar algorithms. With better PSNR, the proposed method depicts a three layer of security of the information and error free decryption.

关键词： Cryptography Steganography Security Encryption Decryption

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A Secure Image Steganography Using Advanced Encryption Standard and Discrete Cosine Transform

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Journal of Information Security（信息安全） 2019年第3期

作者： Ashraful Tauhid Maisha Tasnim saima Arifin noor Nuruzzaman Faruqui Mohammad Abu Yousuf

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Milk phospholipids-based nanostructures functionalized with rhamnolipids and bacteriocin:Intrinsic and synergistic antimicrobial activity for cheese preservation

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Food Bioscience 2022年第3期47卷 371-382页

作者： Ayesha Sardar Khalid Taskeen Niaz Bina Zarif saima Shabbir Tayyaba noor Ramla Shahid Muhammad Imran Department of Biosciences Faculty of SciencesCOMSATS University IslamabadPark RoadIslamabad45550Pakistan Department of Materials Science and Engineering Institute of Space TechnologyIslamabad44000Pakistan School of Chemical and Materials Engineering (SCME) National University of Science and Technology (NUST)IslamabadPakistan

Milk fat globule membrane (MFGM) phospholipids-based nanostructures were developed and their functionalization with rhamnolipids (RLs) was carried out to enhance the preservation of cheese against resistant foodborne pathogens i.e.,Listeria monocytogenes and Escherichia coli .Void (without nisin) and nisin-loaded RLs functionalized MFGM nanostructures (RLs-MFGM-NS) were fabricated by ultrasonication-assisted self-assembly *** morphology of void and loaded RLs-MFGM-NS and pristine MFGM nanostructures (MFGM-NS) was observed under scanning electron microscopy (SEM),which indicated uniform size ranging from 43 nm (void RLs-MFGM-NS) to 194 nm (loaded RLs-MFGM-NS).FTIR analyses confirmed the electrostatic interaction,predominantly H-bonding and linkage of carboxyl ester group of MFGM with C–H group in RLs after functionalization of ***,quantitative antimicrobial assay on cheese slices confirmed the broad-spectrum potential of intrinsically active nanostructures (due to RLs) having synergistic activity with nisin against *** and *** .Hence,nisin-loaded RLs-MFGM-NS can be applied as promising bioactive additives for sustained preservation of cheese.

关键词： Rhamnolipids Nisin MFGM Functionalized nanostructures Foodborne pathogens

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