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Effect of Ca:Mg ratio and high ammoniacal nitrogen on characteristics of struvite precipitated from waste activated sludge digester effluent

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Journal of Environmental Sciences 2019年第12期31卷 65-77页

作者： Chathurani Moragaspitiya jay Rajapakse Graeme J.Millar Science and Engineering Faculty Queensland University of Technology (QUT)

This study revealed the relationship between the presence of calcium impurities and ammoniacal nitrogen concentration upon crystallization of *** research hypothesis was that the presence of both calcium and high concentrations of ammoniacal nitrogen(328–1000 mg/L)in waste activated sludge may influence the struvite quality and acid ***,we studied the impact of Ca:Mg ratio upon morphology,particle size,purity and dissolution of struvite,in the presence of varying levels of excess ammoniacal nitrogen.X-ray diffraction revealed that up to 31.4%amorphous material was made which was assigned to *** the ammoniacal nitrogen concentration and elevation of the Mg:Ca ratio maximized the presence of *** particle size was also increased by ammoniacal nitrogen as was twinning of the *** with dilute solutions of organic acid revealed the sensitivity of struvite dissolution to the physical characteristics of the *** particles(21.2μm)dissolved at higher rates than larger particles(35.86μm).However,struvite dissolved rapidly as the p H was further reduced irrespective of the physical ***,addition of struvite to low p H soils was not viewed as beneficial in terms of controlled nutrient ***,this study revealed that waste activated sludge effluent with high ammoniacal nitrogen was prospective for synthesis of high quality struvite material.

关键词： Struvite Purity Calcium Ammoniacal nitrogen Waste activated sludge

A practical approach to improve alarm system performance: Application to power plant

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Chinese Journal of Chemical Engineering 2019年第5期27卷 1094-1102页

作者： jay Sompura Amit Joshi Babji Srinivasan Rajagopalan Srinivasan Department of Electrical Engineering Indian Institute of Technology GandhinagarIndia Department of Chemical Engineering Indian Institute ofTechnology GandhinagarIndia Department of Chemical Engineering Indian Institute ofTechnology MadrasIndia

Process safety in chemical industries is considered to be one of the important goals towards sustainable development. This is due to the fact that, major accidents still occur and continue to exert significant reputational and financial impacts on process industries. Alarm systems constitute an indispensable component of automation as they draw the attention of process operators to any abnormal conditi on in the plant. Therefore, if deployed properly, alarm systems can play a critical role in helping plant operators ensure process safety and profitability. How-ever, in practice, many process plants suffer from poor alarm system configuration which leads to nuisance alarms and alarm floods that compromise safety. A vast amount of research has primarily focused on developing sophisticated alarm management algorithms to address specific issues. In this article, we provide a simple, practical, systematic approach that can be applied by plant engineers (i.e., non-experts) to improve industrial alarm system performance. The proposed approach is demonstrated using an industrial power plant case study.

关键词： Chattering alarm Correspondence analysis Density based clustering Duplicate alarms Combined-cycle power plant Association rule mining

ASSERT:attack synthesis and separation with entropy redistribution towards predictive cyber defense

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Cybersecurity 2019年第1期2卷 253-270页

作者： Ahmet Okutan Shanchieh jay Yang Computer Engineering Rochester Institute of TechnologyRochesterNYUSA

The sophistication of cyberattacks penetrating into enterprise networks has called for predictive defense beyond intrusion detection,where different attack strategies can be analyzed and used to anticipate next malicious actions,especially the unusual ***,traditional predictive analytics or machine learning techniques that require training data of known attack strategies are not practical,given the scarcity of representative data and the evolving nature of *** paper describes the design and evaluation of a novel automated system,ASSERT,which continuously synthesizes and separates cyberattack behavior models to enable better prediction of future *** takes streaming malicious event evidences as inputs,abstracts them to edge-based behavior aggregates,and associates the edges to attack models,where each represents a unique and collective attack *** follows a dynamic Bayesian-based model generation approach to determine when a new attack behavior is present,and creates new attack models by maximizing a cluster validity *** generates empirical attack models by separating evidences and use the generated models to predict unseen future *** continuously evaluates the quality of the model separation and triggers a re-clustering process when *** the use of 2017 National Collegiate Penetration Testing Competition data,this work demonstrates the effectiveness of ASSERT in terms of the quality of the generated empirical models and the predictability of future actions using the models.

关键词： Cyber security Dynamic bayesian classifier Clustering KL divergence

Feature mapping and state estimation for highly automated vehicles

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Journal of Control and Decision 2015年第1期2卷 1-25页

作者： Anh Vu jay A.Farrell Department of Electrical and Computer Engineering University of California-RiversideRiversideCAUSA

The past decade has witnessed an acceleration of autonomous vehicle research and development,with technological advances contributed by academia,government,and the industrial and consumer *** advancements hold the potential to improve society by enhancing transportation safety and throughput,where decreased congestion saves time and reduces vehicle *** of the key technologies to enable vehicle infrastructure interaction,advanced traffic management,and automated vehicles are automated roadway mapping and reliable vehicle state *** this paper,we present an overview and new methods for the problems automated roadway mapping plus a discussion of the extension of these methods to the problem of vehicle state *** from the application of these methods to feature mapping and state estimation are presented.

关键词： automated precise mapping vehicle state estimation Bayesian estimation vehicle infrastructure interaction advanced driver assistance systems autonomous driving

Optical enhancement effects of plasmonic nanostructures on organic photovoltaic cells

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Chinese Chemical Letters 2015年第4期26卷 419-425页

作者： Hui Joon Park L.jay Guo Division of Energy Systems Research Ajou University Department of Electrical Engineering and Computer Science University of Michigan

In this article, the optical enhancement effects of plasmonic nanostructures on OPV cells were reviewed as an effective way to resolve the mismatch problems between the short exciton diffusion length in organic semiconductors （around 10 nm） and the large thickness required to fully absorb sunlight （e.g. hundreds of nanometers）. Especially, the performances of OPVs with plasmonic nanoparticles in photoactive and buffer layers and with periodic nanostructures were investigated. Furthermore, nanoimprint lithography-based nanofabrication processes that can easily control the dimension and uniformity of structures for large-area and uniform I^lasmonic nanostructures were demonstrated.

关键词： Organic photovoltaicPlasmonic nanostructureNanoparticleNanogratingNanoimprint lithography

Carbene chemistry for unnatural biosynthesis

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Science China(Life Sciences) 2024年第1期67卷 204-207页

作者： Jing Huang jay D.Keasling Department of Chemical and Biomolecular Engineering University of CaliforniaBerkeley 94720USA Joint BioEnergy Institute Lawrence Berkeley National LaboratoryEmeryville 94608USA Biological Systems and Engineering Division Lawrence Berkeley National LaboratoryBerkeley 94720USA Novo Nordisk Foundation Center for Biosustainability Technical University of DenmarkKongens Lyngby 2800Denmark Department of Bioengineering University of CaliforniaBerkeley 94720USA Synthetic Biochemistry Center Institute for Synthetic BiologyShenzhen Institutes for Advanced TechnologiesShenzhen 518055China

Previously,chemists working in synthesis were jealous of biologists since the enzymes found in nature usually exhibited great catalytic properties(e.g.,high catalytic efficiency,excellent selectivity such as substrate selectivity,regioselectivity and stereoselectivity).However,biological systems lack many counterparts of reactions widely used in chemical synthesis.

关键词： synthesis selectivity catalytic

An improvised in vitro vegetative propagation technique for Bambusa tulda： influence of season, sterilization and hormones

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Journal of Forestry Research 2018年第4期29卷 1059-1064页

作者： Deepti Bhadrawale jay Prakash Mishra Yogeshwar Mishra Tropical Forest Research Institute P.O.-R.F.R.C. Mandla Road Jabalpur Madhya Pradesh 482021 India

Season and concentration of sterilizing agents play a significant role for establishment of aseptic in vitro shoot cultures and sprouting of nodal explants from field growing culms of bamboo species. In the present investigation the nodal segment explants of Bambusa tulda Roxb collected in different seasons and treated with various concentrations of HgC12 showed significant variation in aseptic culture establishment and bud break. The rainy season （July-August） recorded with highest of 78% aseptic culture establishment whereas autumn recorded with lowest 46%. Summer and winter seasons emerged to be the best period, registering 〉 60% in vitro bud break. On the other hand, the autumn season had the lowest value for bud break, i.e. 42%. Among different doses of sterilizing agent tried, HgC12 0.1% found to be suitable for maximum aseptic culture establishment （66%） as well as bud break （59%）. However, among the interactions, summer season and the dose of 0.1% HgC12 exhibited maximum of 73% response for both aseptic culture establishment and bud break. MS medium （liquid） enriched with 5.0 μM BA ＋5.0 μM Kn [Kinetin （N6-Furfuryladenine）] with additional supplementation of 100 μM glutamine ＋ 0.1 μM IAA supported a maximum in vitro shoot multiplication of 4.75 fold. The proliferated shoots were successfully rooted on MS medium （liquid） supplemented 40 μM coumarin. The plantlets transferred to the polythene bags showed 98% survival.

关键词： Aseptic culture Bambusa tulda Roxb Bud sprouting Season

Addressing e-cigarette health claims made on social media amidst the COVID-19 pandemic

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World Journal of Pediatrics 2021年第1期17卷 3-5页

作者： Nilanga Aki Bandara jay Herath Vahid Mehrnoush University of British Columbia Faculty of Education 6081 University BlvdVancouverBC V6T 1Z1Canada University of British Columbia Faculty of Medicine 317-2194 Health Sciences MallVancouver V6T 1Z3BCCanada

We are in a global pandemic that is responsible for more than 73.6 million confirmed cases and over 1.64 million *** evidence highlights that electronic cigarette(e-cig)use by young people has a strong association with COVID-19 diagnosis[1].The e-cig industry has successfully utilized social media platforms to market e-cigs to adolescents[2].The industry typically posts on various social media sites,such as Ins-tagram and Reddit,frequented by adolescents.

关键词： media typically utilized

Numerical investigation of velocity ratio effect in combined wall and offset jet flows

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Journal of Hydrodynamics 2018年第6期30卷 1105-1119页

作者： Nidhal Hnaien Salwa Marzouk Habib Ben Aissia Jacques jay Unité de Métrologie et des systèmes énergétiques Ecole National d'ingénieurs de Monastir Tunisie Centre de Thermique de Lyon (CETHIL-UMR CNRS 5008) INSA de Lyon France

In the present work, we propose to numerically study a combined turbulent wall and offset jet flow(this combination will be denoted WOJ). Several turbulence models were tested in this study: the standard k-w, SST k-w, standard k-ε, RNG, and realizable k-ε model. A parametric study was performed to determine the effect of offset ratio H and the velocity ratio r on the longitudinal and transverse positions of the merge point(MP), the combined point(CP), the upper vortex center(UVC) and the lower vortex center(LVC). Correlations that predict the position of these characteristic points of the WOJ flow as a function of H and r have been provided. Results show that any increase in the velocity ratio causes a displacement of the MP, CP, UVC and LVC further upstream along the longitudinal direction. Concerning the transverse positions, the increase of velocity ratio results in a deviation of the merge point(MP) and the lower vortex center(LVC) toward the strong jet(LWJ) whereas the transverse position of combined point(CP) and the upper vortex center(UVC) is almost independent of the velocity ratio.

关键词： Finite volume combined point merge point offset jet velocity ratio