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Guidelines for rational design of high-performance absorbents:A case study of zeolite adsorbents for emerging pollutants in water

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Green Energy & Environment 2017年第4期2卷 363-369页

作者： Xiaoxuan Wei Ya Wang arturo j.Hernndez-maldonado Zhongfang Chen Department of Chemistry Institute for Functional Nanomaterials University of Puerto Rico Rio Piedras Campus Department of Chemical Engineering Institute for Functional Nanomaterials University of Puerto Rico Mayagüez Campus

Rational design is important to achieve high-performance sorbents used to remove the contaminants of emerging concern(CECs) from ***, it is hard to propose effective design guidelines due to the lack of a clear understanding of the interaction mechanisms. By means of systematic quantum chemical computations, as a case study, we investigated the interactions between zeolite X/M^(n+)-zeolite X(Si/Al=1,M^(n+)=Cu^(2+) and Ni^(2+)) and three commonly used CECs(namely salicylic acid, carbamazepine and ciprofloxacin) in water to clarify the adsorption mechanisms. Our computations found that anionic salicylic acid cannot be adsorbed by neither zeolite X nor M^(n+)-zeolite X in neutral water due to the high electrostatic repulsion. In comparison, carbamazepine and ciprofloxacin have favorable binding energies with both zeolite X and M^(n+)-zeolite X, and their interactions with M^(n+)-zeolite X are stronger due to the joint effects of H-bond, metal complexation and electrostatic interaction. The adsorption loading of ciprofloxacin, which has a large molecular size, on M^(n+)-zeolite X is limited due to the steric hindrance. In general, steric hindrance, electrostatic interaction, H-bond and metal complexation are dominant factors for the examined systems in this study. Thus, for the design of high-performance absorbing materials, we should fully consider the molecular properties of pollutants(molecular size, surface electrostatic potential and atomic type, etc.), and properly enhance the favorable effects and avoid the unfavorable factors as much as possible under the guidance of the interaction mechanisms.

关键词： Adsorption mechanism Adsorbent design guidelines Quantum chemical computations Contaminants of emerging concern Zeolite X

Rapid and robust slope failure appraisal using aerial photogrammetry and 3D slope stability models

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International journal of Mining Science and Technology 2020年第5期30卷 651-658页

作者： Neil Bar Michael Kostadinovski Michael Tucker Glen Byng Rully Rachmatullah arturo maldonado Markus Pötsch Andreas Gaich Alison McQuillan Thamer Yacoub BHP PerthWA 6000Australia 3GSM GmbH 8010 GrazStyriaAustria Rocscience Inc. Toronto M5T 1V1Canada

Slope failures are an inevitable aspect of economic pit slope designs in the mining *** open pit guidelines and industry standards accept up to 30%of benches in open pits to collapse provided that they are controlled and that no personnel are at *** ground control measures including real time monitoring systems at TARP(trigger-action-response-plan)protocols are widely utilized to prevent personnel from being exposed to slope failure *** and computing capability are rapidly *** photogrammetry techniques using UAV(unmanned aerial vehicle)enable geotechnical engineers and engineering geologists to work faster and more safely by removing themselves from potential line-of-fire near unstable *** stability modelling software using limit equilibrium(LE)and finite element(FE)methods in three dimensions(3D)is also becoming more accessible,user-friendly and faster to *** key components enable geotechnical engineers to undertake site investigations,develop geotechnical models and assess slope stability faster and in more detail with less exposure to fall of ground hazards in the *** paper describes the rapid and robust process utilized at BHP Limited for appraising a slope failure at an iron ore mine site in the Pilbara region of Western Australia using a combination of UAV photogrammetry and 3D slope stability models in less than a shift(*** than 12 h).

关键词： Slope stability 3D limit equilibrium analysis Aerial imagery Photogrammetry Open pit mining

DIFFERENTIAL OPERATORS OF INFINITE ORDER IN THE SPACE OF RAPIDLY DECREASING SEQUENCES

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Acta Mathematica Scientia 2016年第2期36卷 325-333页

作者： M.maldonado j.PRADA M.j.SENOSIAIN Department of Mathematics Salamanca University

We consider the space of rapidly decreasing sequences s and the derivative operator D defined on it. The object of this article is to study the equivalence of a differential operator of infinite order; that is φ（D） =^∞∑k=0φkD^k.φk constant numbers an a power of ***, meaning, is there a isomorphism X （from s onto s） such that Xφ（D） = D^nX？. We prove that if φ（D） is equivalent to Dn, then φ（D） is of finite order, in fact a polynomial of degree n. The question of the equivalence of two differential operators of finite order in the space s is addressed too and solved completely when n = 1.

关键词： Ordinary differential operators sequence spaces operators on function spaces

Gas exchange and water relations of young potted loquat *** under progressive drought conditions

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journal of Integrative Agriculture 2018年第6期17卷 1360-1368页

作者： A.Stellfeldt M.A.maldonado j.j.Hueso j.Cuevas Department of Agronomy University of AlmeriaceiA3 Almeria 04120Spain Experimental Station of Cajamar Las Palmerillas ceiA3 Almeria 04710Spain

Relationships between plant water status and gas exchange parameters at increasing levels of water stress were determined in Algerie loquats which grown in 50 I pots. Changes in soil water content and stem water potential and their effects on stomatal conductance （Gs ） and net photosynthesis （Pn） rate were followed in control plants and in plants without irrigation until the latter reached near permanent wilting point and some leaf abscission took place. Then, the irrigation was restarted and the comparison repeated. Soil water content and stem water potential gradually diminished in response to drought reaching the minimum values of 0.9 mm and -5.0 MPa, respectively, 9 days after watering suspension. Compromised plant water status had drastic effects on Gs values that dropped by 97％ in the last day of the drought period. Pn was diminished by 80％ at the end of the drought period. The increasing levels of water stress did not cause a steady increase in leaf temperature in non-irrigated plants. Non-irrigated plants wilted and lost some leaves due to the severity of the water stress. However, all non-irrigated plants survived and reached similar Pn than control plants just a week after the irrigation was restarted, confirming drought tolerance of loquat and suggesting that photosynthesis machinery remained intact.

关键词： Eriobotrya japonica deficit irrigation stem water potential net photosynthetic rate stomatal conductance

Multi-Sectoral Reflections and Efforts in Strengthening Partnerships to Reduce Disaster Risk in Mexico:The First MuSe-IDRiM Conference

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International journal of Disaster Risk Science 2020年第5期11卷 686-691页

作者： Irasema Alcantara-Ayala Daniel Rodriguez-Velazquez Ricardo j Garnica-Pena Alejandra maldonado-Martinez Institute of Geography National Autonomous University of Mexico(UNAM)04510 Mexico CityMexico National School of Social Work.National Autonomous University of Mexico(UNAM) 04510 Mexico CityMexico Disaster Risk Reduction Consultant 04700 Mexico CityMexico

Notwithstanding the high societal impact of disasters in Mexico,there is a lack of integrated efforts to establish a sound policy for reducing disaster risk to counterbalance the existing concentrated endeavors in disaster *** the face of such segmentation,the science and technology community has advocated for a change of perspective,from civil protection to integrated disaster risk *** first Multi-Sectoral Conference towards Integrated Disaster Risk Management in Mexico:Building a National Public Policy(MuSe-IDRiM Conference)was held in Mexico City at National Autonomous University of Mexico,21-24 October *** support of the implementation of the Sendai Framework for Disaster Risk Reduction 2015-2030,the conference aimed at enhancing the dialogue between the scienee and technology community,citizens,civil society organizations,private and public sectors,and the federtil,state,and municipal governments to foster the process of transforming the current National Civil Protection System into a national public policy oriented towards integrated disaster risk management(DRM).Barriers and challenges to the implementation of integrated DRM were *** of integrated DRM challenges current socioeconomic structures and encourages all releva nt stakeholders to think,decide,and act from a different perspective and within and across spatial,temporal,jurisdictional,and institutional *** disaster risk from an integrated approach,learning skills that authorities have not learned or used,and hence,strengthening disaster risk governance are prerequisites to effectively manage disaster risk.

关键词： Disaster risk reduction Integrated disaster risk management Mexico Science-based policy making SINAPROC

Hybrid solar cells constructed of macroporous n-type GaP coated with PEDOT:PSS

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Chinese Chemical Letters 2015年第4期26卷 469-473页

作者： Zhijie Wang Elizabeth S.Brown Stephen maldonado Department of Chemistry University of Michigan Program in Applied Physics University of Michigan

Hybrid organic-inorganic solar cell devices were fabricated utilizing macroporous n-type GaP and poly（3,4-ethylenedioxythiophene）：poly（4-styrene sulfonate）（PEDOT：PSS）. The high-aspect ratio structures of the macroporous GaP resulted in higher photocurrent and external quantum yield as a function of wavelength. Photocurrent-voltage measurements as a function of light intensity revealed information on the dependence of short-circuit current （jsc） and open-circuit voltage （Voc） on light intensity. Under 1.0 Sun illumination, hybrid macroporous GaPjPEDOT：PSS devices showed jsc of 2.34 mA cm 2, Voc of 0.95 V, fill factor of 0.54, and overall efficiency of 1.21%. The extent of the influence of dopant density of GaP on hybrid device performance was probed with current density-voltage measurements. The addition of a gold nanoparticle coating on macroporous GaP prior to PEDOT：PSS coating showed increased device performance, with overall efficiency of 1.81%. Gold-modified planar GaPjPEDOT：PSS showed decreased jsc and Voc values and lower external quantum yield over all wavelengths,

关键词： Gallium phosphideOrganic-inorganic solar cellMacroporous

Laser diode stacks:pulsed light power for nuclear fusion

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High Power Laser Science and Engineering 2016年第2期4卷 29-36页

作者： Martin Wlz Agnieszka Pietrzak Alex Kindsvater jens Meusel Klaus Stolberg Ralf Hlsewede jrgen Sebastian Valentin Loyo-maldonado jenoptik Laser GmbH jenoptik Diode Lab GmbH

Laser drivers are an enabling factor to inertial confinement fusion, because laser diodes must be used instead of flash lamps. We discuss the limitations of laser diode arrays and show what steps the industry is taking. The pump power requirements of large-scale projects such as LIFE or Hi PER are within reach of semiconductor laser diode *** light output powers per laser bars have been around 300 W per bar, as in the jenoptik 940 nm bars previously used for pumping the Yb:YAG slabs in the Di POLE project. By redesigning the semiconductor laser structures 500 W per bar is now commercially available for 808, 880 and 940 nm pump wavelengths. The construction of one inertial fusion power plant will require an amount of semiconductor laser chips in excess of the current annual production by two orders of magnitude. This adds to the engineering task of improving the device characteristics a challenge to production *** the industry benefits from the recent boost in solid-state lighting that acts as a technology driver, cooperation between manufacturers will be imperative, and to this end we propose standardization efforts.

关键词： diode pumped DPSSL high-energy class IFE inertial fusion energy laser diode solid-state-laser

Behavioral aspects and the transmission of Monkeypox:A novel approach to determine the probability of transmission for sexually transmissible diseases

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Infectious Disease Modelling 2023年第3期8卷 842-854页

作者： G.D.Fernandes Victor maldonado Mechanical Engineering Department Texas Tech UniversityUSA

Motivated by the 2022 worldwide Monkeypox(MPox)outbreak,a compartmental model is proposed to predict the evolution of the *** models have been proposed for infectious diseases so far,although the number of variables makes it difficult to establish causation relations between individual factors and transmission *** order to evaluate the reaction of susceptible people to avoid infection during the outbreak,the rate of transmission is modeled through a unique phenomenological probabilistic approach,allowing the expression of the rate of generation of new cases in terms of two charac-teristics of the susceptible group:the frequency of sexual encounters and the probability of transmission given that there is a sexual *** rates are obtained and compared for the *** several other *** show reductions of up to 71%in the transmissibility parameter,which may be combined with variations in the frequency of sexual encounters(obtained through behavioral research)to determine the changes in the probability of transmission during an outbreak in a much more convenient way than current *** framework presents a valuable tool to health authorities in the understanding of future sexually transmissible disease outbreaks.

关键词： approach convenient determine

Two rare cancers of the exocrine pancreas: to treat or not to treat like ductal adenocarcinoma?

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journal of Cancer Metastasis and Treatment 2023年第1期9卷 342-367页

作者： Nebojsa Skorupan Shadin Ghabra jAlberto maldonado Yang Zhang Christine Alewine Laboratory of Molecular Biology NCI Center for Cancer ResearchBethesdaMD 20892USA Medical Oncology Program NCI Center for Cancer ResearchBethesdaMD 20892USA Surgical Oncology Program NCI Center for Cancer ResearchBethesdaMD 20892USA Medical Research Scholars Program NCI Center for Cancer ResearchBethesdaMD 20892USA Gastrointestinal Pathology Joint Pathology CenterSilver SpringMD 20910USA

Pancreatic cancer is an aggressive malignancy with increasing *** ductal adenocarcinoma(PDAC)accounts for>90%of pancreatic cancer diagnoses,while other exocrine tumors are much *** this review,we have focused on two rare cancers of the exocrine pancreas:adenosquamous carcinoma of the pancreas(ASCP)and pancreatic acinar cell carcinoma(PACC).The latest findings regarding their cellular and molecular pathology,clinical characteristics,prognosis,and clinical management are *** genetic and transcriptomic data suggest that ASCP is related to or overlaps with the basal transcriptomic subtype of *** tumors are highly aggressive and driven by activated KRAS and MYC *** outcomes remain poor and effective treatments are *** has no morphologic or genetic resemblance to PDAC and more favorable *** stage PACC patients have improved survival with surgical resection and patients with advanced disease benefit most from platinum-or fluoropyrimidine-containing *** of actionable genetic mutations is high in this disease and case reports suggest good outcomes when matched therapy is *** clinical studies examining ASCP and PACC are limited and difficult to *** research is needed to define optimal clinical management for these rare diseases.

关键词： Adenosquamous carcinoma of the pancreas acinar cell carcinoma of the pancreas rare exocrine pancreatic cancer