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Optimization and modeling of coagulation-flocculation to remove algae and organic matter from surface water by response surface methodology

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Frontiers of Environmental Science & Engineering 2019年第5期13卷 115-127页

作者： Ziming Zhao Wenjun Sun Madhumita Bray ajay k ray Tianyin Huang Jiabin Chen School of Environment Tsinghua UniversityBeijing 100084China Department of Chemical and Biochemical Engineering Western UniversityLondon Ontario N6A 5B9Canada Research Institute for Environmental Innovation(Suzhou) Tsinghua UniversitySuzhou 215163China School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China

Seasonal algal blooms of Lake Yangcheng highlight the necessity to develop an effective and optimal water treatment process to enhance the removal of algae and dissolved organic matter (DOM). In the present study, the coagulation performance for the removal of algae, turbidity, dissolved organic carbon (DOC) and ultraviolet absorbance at 254 nm (UV254) was investigated systematically by central composite design (CCD) using response surface methodology (RSM). The regression models were developed to illustrate the relationships between coagulation performance and experimental variables. Analysis of variance (ANOVA) was performed to test the significance of the response surface models. It can be concluded that the major mechanisms of coagulation to remove algae and DOM were charge neutralization and sweep flocculation at a pH range of 4.66–6.34. The optimal coagulation conditions with coagulant dosage of 7.57 mg Al/L, pH of 5.42 and initial algal cell density of 3.83 × 106 cell/mL led to removal of 96.76%, 97.64%, 40.23% and 30.12% in term of cell density, turbidity, DOC and UV254 absorbance, respectively, which were in good agreement with the validation experimental results. A comparison between the modeling results derived through both ANOVA and artificial neural networks (ANN) based on experimental data showed a high correlation coefficient, which indicated that the models were significant and fitted well with experimental results. The results proposed a valuable reference for the treatment of algae-laden surface water in practical application by the optimal coagulation-flocculation process.

关键词： Algae Coagulation-flocculation Response surface methodology Artificial neural networks

Layered Potassium Titanium Niobate/Reduced Graphene Oxide Nanocomposite as a Potassium‑Ion Battery Anode

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Nano-Micro Letters 2024年第1期16卷 1-16页

作者： Charlie A.F.Nason ajay Piriya Vijaya kumar Saroja Yi Lu Runzhe Wei Yupei Han Yang Xu Department of Chemistry University College London20 Gordon StreetLondon WC1H 0AJUK

With graphite currently leading as the most viable anode for potassium-ion batteries(kIBs),other materials have been left relatively *** metal oxides are among these,with many positive attributes such as synthetic maturity,longterm cycling stability and fast redox ***,to address this research deficiency we report herein a layered potassium titanium niobate kTiNbO5(kTNO)and its rGO nanocomposite(kTNO/rGO)synthesised via solvothermal methods as a high-performance anode for *** effective distribution across the electrically conductive rGO,the electrochemical performance of the kTNO nanoparticles was *** potassium storage performance of the kTNO/rGO was demonstrated by its first charge capacity of 128.1 mAh g^(−1) and reversible capacity of 97.5 mAh g^(−1) after 500 cycles at 20 mA g^(−1),retaining 76.1%of the initial capacity,with an exceptional rate performance of 54.2 mAh g^(−1)at 1 A g^(−1).Furthermore,to investigate the attributes of kTNO in-situ XRD was performed,indicating a low-strain ***-situ X-ray photoelectron spectra further investigated the mechanism of charge storage,with the titanium showing greater redox reversibility than the *** work suggests this lowstrain nature is a highly advantageous property and well worth regarding kTNO as a promising anode for future high-performance kIBs.

关键词： Potassium-ion batteries Intercalation Transition metal oxides Anodes Nanocomposite

Comprehensive analysis of uncertainty quantification for the^(58)Ni(n,p)^(58)Co reaction cross section

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Chinese Physics C 2024年第9期48卷 170-175页

作者： Mahesh Choudhary Aman Sharma Namrata Singh Mahima Upadhyay Punit Dubey A.Gandhi Akash Hingu G Mishra Sukanya De L.S.Danu ajay kumar R.G.Thomas Saurav Sood Sajin Prasad S.Mukherjee I.N.Ruskov Yu.N.kopatch A.kumar Department of Physics Banaras Hindu UniversityVaranasi 221005India Horia Hulubei National Institute of Physics and Nuclear Engineering-IFIN-HH Bucharest 077125Romania Department of Physics The Maharaja Sayajirao University of BarodaVadodara 390002India Nuclear Physics Division Bhabha Atomic Research CentreMumbai 400085India Health Physics Division Bhabha Atomic Research CentreMumbai 400085India Department of Electrical Power Engineering Brno University of TechnologyBrno 61600Czech Republic Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of SciencesSofia 1784Bulgaria Joint Institute for Nuclear Research(JINR) Dubna 141980Russia

In this study,we measured the^(58)Ni(n,p)^(58)Co reaction cross section with neutron energies of 1.06,1.86,and 2.85 *** cross section was measured using neutron activation techniques andγ-ray spectroscopy,and it was compared with cross section data available in the ***,we calculated the covariance matrix of the measured cross section for the aforementioned nuclear *** uncertainties of the theoretical calculation for^(58)Ni(n,p)^(58)Co reaction cross section were calculated via Monte Carlo *** this study,we used uncertainties in the optical model and level density parameters to calculate uncertainties in the theoretical cross *** theoretical calculations were performed by using *** this study,we aim to analyze the effect of uncertainties of the nuclear model input as well as different experimental variables used to obtain the values of reaction cross section.

关键词： ^(58)Ni(n p)^(58)Co reaction γ-ray spectroscopy uncertainty quantification of cross section covariance analysis

Investigation of 58Ni(n, p)58Co reaction cross-section with covariance analysis

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Chinese Physics C 2024年第2期48卷 78-90页

作者： Akash Hingu S.Mukherjee Siddharth Parashari Arora Sangeeta A.Gandhi Mahima Upadhyay Mahesh Choudhary Sumit Bamal Namrata Singh G.Mishra Sukanya De Saurav Sood Sajin Prasad G.Saxena ajay kumar R.G.Thomas B.k.Agrawal k.katovsky A.kumar Department of Physics Faculty of ScienceThe M.S.University of BarodaVadodara 390002India Faculty of Electrical Engineering and Communication Brno University of TechnologyBrnoCzech Republic Department of Physics Faculty of ScienceUniversity of ZagrebBijenička c.32Zagreb 10000Croatia Department of Physics University Institute of SciencesChandigarh UniversityGharuanMohali 140413PunjabIndia Department of Physics Banaras Hindu UniversityVaranasi 221005India Horia Hulubei National Institute for Physics and Nuclear Engineering Măgurele 077125Romania Nuclear Physics Division Bhabha Atomic Research CentreMumbai 400085India Health Physics Division Bhabha Atomic Research CentreMumbai 400085India Department of Physics(H&S) Government Women Engineering CollegeAjmer 305002India Saha Institute of Nuclear Physics Kolkata 700064India Homi Bhabha National Institute Anushakti NagarMumbai 400094India

The excitation function of the 58Ni(n,p)58Co reaction was measured using the well-established neutron activation technique andγ-ray *** in the energy range of 1.7 to 2.7 MeV were generated using the 7Li(p,n)*** neutron flux was measured using the standard 115In(n,n’)115mIn monitor *** results of the neutron spectrum averaged cross-section of 58Ni(n,p)58Co reactions were compared with existing cross-section data available in the EXFOR data library as well as with various evaluated data libraries such as ENDF/B-VIII.0,JEFF-3.3,JENDL-4.0,and *** calculations were performed using the nuclear reaction code *** nuclear level density(NLD)models were tested,and their results were compared with the present *** NLDs were also obtained through the spectral distribution method(SDM).The cross-section results,along with the absolute errors,were obtained by investigating the uncertainty propagation and using the covariance *** forγ-ray true coincidence summing,low-energy background neutrons,andγ-ray self attenuation were *** experimental cross-section obtained in the present study is consistent with previously published experimental data,evaluated libraries,and theoretical calculations carried out using the TALYS code.

关键词： nuclear reactions (n,p)reaction cross-section measurement covariance analysis nuclear level density

Genetic polymorphism in CD14 gene, a co-receptor of TLR4 associated with non-alcoholic fatty liver disease

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World Journal of Gastroenterology 2016年第42期22卷 9346-9355页

作者： Shweta kapil ajay Duseja Bal krishan Sharma Bhupesh Singla Anuradha Chakraborti Ashim Das Pallab ray Radha k Dhiman Yogesh Chawla Department of Hepatology Postgraduate Institute of Medical Education and Research Experimental Medicine and Biotechnology Postgraduate Institute of Medical Education and Research Histopathology Postgraduate Institute of Medical Education and Research Microbiology Postgraduate Institute of Medical Education and Research

AIM To evaluate the pathogenic role of toll-like receptor(TLR) gene polymorphisms in patients with nonalcoholic fatty liver disease(NAFLD).METHODS Two hundred and fifty subjects(NAFLD = 200, healthy volunteers = 50) underwent polymerase chain reaction and restriction fragment length polymorphism to assess one polymorphism in the toll-like receptor 2(TLR2) gene(A753G), two polymorphisms in the TLR4 gene(TLR4 Asp299 Gly and Thr399 Ile allele), and two polymorphisms in the cluster of differentiation 14(CD14)(C-159 T and C-550T) gene, a co-receptor of TLR4. Association of TLR gene polymorphisms with NAFLD and its severity was evaluated by genetic models of *** On both multiplicative and recessive models of gene polymorphism association, there was significant association of CD14 C(-159) T polymorphism with NAFLD; patients with TT genotype had a 2.6 fold increased risk of developing NAFLD in comparison to CC genotype. There was no association of TLR2 Arg753 Gln, TLR4 Asp299 Gly, Thr399 Ile, and CD14 C(-550) T polymorphisms with NAFLD. None of the TLR gene polymorphisms had an association with histological severity of *** Patients with CD14 C(-159) T gene polymorphism, a co-receptor of TLR4, have an increased risk of NAFLD development.

关键词： Non-alcoholic steatohepatitis Nonalcoholic fatty liver disease Toll-like receptors Obesity Cirrhosis Insulin resistance Bacterial overgrowth

Hello,can you hear me?Orthopaedic clinic telephone consultations in the COVID-19 era-a patient and clinician perspective

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World Journal of Orthopedics 2021年第1期12卷 24-34页

作者： Anuhya Vusirikala David Ensor ajay k Asokan Alvin JX Lee Ravi ray Dimitrios Tsekes John Edwin Department of Trauma and Orthopaedics Basildon University HospitalBasildon SS165NLEssexUnited Kingdom Medical Oncology UCL Cancer InstituteLondon WC1E 6BTUnited Kingdom

BACkGROUND The coronavirus disease 2019(COVID-19)pandemic has resulted in seismic changes in healthcare *** a result of this,hospital footfall required to be reduced due to increased risk of transmission of *** ensure patients can safely access healthcare,we introduced orthopaedic clinic telephone consultations in our busy district general *** To investigate patients’and clinicians’perspective of telephone consultations during COVID-19,and whether this method of consultation could be a viable option in the post-pandemic *** This is a single centre,prospective study conducted in a busy National Health Service district general *** May 2020,100 non-consecutive adult patients were contacted by independent investigators within 48 h of their orthopaedic clinic telephone consultation to complete a telephone satisfaction *** questions assessed satisfaction regarding various aspects of the consultation including overall satisfaction and willingness to use this approach long *** and perspective of 25 clinicians conducting these telephone consultations was also assessed via an online survey *** 93%of patients were overall satisfied with telephone consultations and 79%were willing to continue this method of consultation *** found telephone consultations to reduce personal cost and inconvenience associated with attending a hospital appointment.72%of clinicians reported overall satisfaction with this service and 80%agreed that telephone consultations should be used in the *** majority found it less laborious in time and administration in comparison to face to face *** and clinicians expressed their desire for video consultations as a method of further improving their experience with remote *** Our study has shown that telephone consultations are a safe and rapid method of adaptation to the COVID-19 pandemic,achieving the aim of reduci

关键词： COVID-19 Telephone consultation Orthopaedic clinic Patient satisfaction Patient perspective Clinician perspective

NiCo2O4 decorated PANI–CNTs composites as supercapacitive electrode materials

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Journal of Energy Chemistry 2017年第1期26卷 175-181页

作者： Gunjana Chaudhary Ashok k.Sharma Preetam Bhardwaj kamal kant Indu kaushal ajay k.Mishra Thin Film Laboratory Department of Materials Science and NanotechnologyDeenbandhu Chhotu Ram University of Science and TechnologyMurthal 131039India Nanotechnology and Water Sustainability Research Unit College of ScienceUniversity of South AfricaUnisa Science CampusJohannesburgSouth Africa

Hierarchical Ni CoO/PANI/CNTs hybrid composites were designed and fabricated having a layer of Ni CoOon the surface of PANI encapsulated CNTs with different morphologies. Physicochemical attributes of the synthesized composites were examined by FTIR, UV–visible and X-ray diffraction（XRD）techniques. Morphological aspects were evaluated by field-emission scanning microscopy（FESEM）,electron diffraction spectroscopy（EDS）, high resolution transmission electron microscopy（HRTEM） and selected area electron diffraction（SAED） studies. Electrochemical measurements revealed an improved specific capacitance of 2250 F/g at a scan rate of 5 m V/s and 2000 F/g at a current density of 1 A/g with good rate capability using a three-electrode system. These enhanced features are achieved from the well designed nanostructure and the synergistic contributions of individual components in the electrode material.

关键词： Polyaniline Carbon nanotubes Nickel cobaltite Supercapacitor

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

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Acta Metallurgica Sinica(English Letters) 2015年第7期28卷 847-857页

作者： ajay kumar Behera N.k.Mohanty S.k.Satpathy Banarji Behera P.Nayak Materials Research Laboratory School of PhysicsSambalpur University

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5（Bi LaxFe1-xO3）–0.5（Pb Ti O3）（x = 0.05,0.10,0.15,0.20）（BLxF1-x-PT） were prepared by mixed oxide *** characterization was performed by X-ray diffraction and shows a tetragonal structure at room *** lattice parameter c/a ratio decreases with increasing of La（x = 0.05–0.20） concentration of the *** effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range（102–106Hz） at different *** nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the *** electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the *** ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures（200–300 ℃）.

关键词： X-ray diffraction Composite materials Impedance spectroscopy Modulus studies Activation energy Relaxation phenomena

Comparative evaluation for catalytic gasification of petroleum coke and asphaltene in subcritical and supercritical water

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Journal of Energy Chemistry 2019年第4期28卷 107-118页

作者： Rachita Rana Sonil Nanda Aimee Maclennan Yongfeng Hu Janusz A.kozinski ajay k.Dalai Department of Chemical and Biological Engineering University of Saskatchewan Department of Chemical and Biochemical Engineering University of Western Ontario Soft X-ray Micro-Characterization Beamline Canadian Light Source Inc. New Model in Technology & Engineering

Subcritical and supercritical water gasification of petroleum coke and asphaltene was performed at variable temperatures(350–650°C),feed concentrations(15–30 wt%)and reaction times(15–60 min).Nickel-impregnated activated carbon(Ni/AC)was synthesized as a catalyst for enhancing syngas yields at optimal gasification conditions(650°C,15 wt%and 60 min).Structural chemistry of precursors and chars developed at different gasification temperatures was studied using physicochemical and synchrotronbased approaches such as carbon–hydrogen–nitrogen–sulfur(CHNS)analysis,thermogravimetric and differential thermogravimetric analysis(TGA/DTA),scanning electron microscopy(SEM),Fourier-Transform Infrared spectroscopy(FTIR),Raman spectroscopy,X-ray diffraction(XRD)and X-ray absorption spectroscopy(XAS).Asphaltene testified to be a better precursor for catalytic hydrothermal gasification leading to 11.97 mmol/g of total gas yield compared to petroleum coke(8.04 mmol/g).In particular,supercritical water gasification using 5 wt%Ni/AC at 650°C with 15 wt%feed concentration for 60 min resulted in 4.17 and 2.98 mmol/g of H_2from asphaltene and petroleum coke,*** the same conditions,the respective CH_4yields from catalytic gasification of asphaltene and petroleum coke were 2.54and 1.07 mmol/***,asphaltene also seemed to an attractive feedstock for the production of highly aromatic chars through hydrothermal gasification.

关键词： Asphaltene Petroleum coke Subcritical water Supercritical water Gasification Char