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A concise review on surface and structural modification of porous zeolite scaffold for enhanced hydrogen storage

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Chinese Journal of Chemical Engineering 2024年第6期70卷 33-53页

作者： B.A.Abdulkadir R.s.R.Mohd Zaki A.T.Abd Wahab s.N.Miskan Anh-Tam Nguyen Dai-Viet N.Vo H.D.setiabudi Centre for Research in Advanced Fluid&Processes Universiti Malaysia Pahang Al-Sultan AbdullahLebuh Persiaran Tun Khalil YaakobGambangPahang 26300Malaysia Faculty of Chemical&Process Engineering Technology Universiti Malaysia Pahang Al-Sultan AbdullahLebuh Persiaran Tun Khalil YaakobGambangPahang 26300Malaysia Center of Excellence for Green Energy and Environmental Nanomaterials(CE@GrEEN) Nguyen Tat Thanh University300A Nguyen Tat ThanhDistrict 4Ho Chi Minh City 755414Viet Nam

Investigating zeolites as hydrogen storage scaffolds is imperative due to their porous nature and favorable physicochemical ***,the storage capacity of the unmodified zeolites has been rather unsatisfactory(0.224%-1.082%(mass))compared to its modified ***,the contemporary focus on enhancing hydrogen storage capacities has led to significant attention towards the utilization of modified zeolites,with studies exploring surface modifications through physical and chemical treatments,as well as the integration of various active *** enhanced hydrogen storage properties of zeolites are attributed to the presence of aluminosilicates from alkaline and alkaline-earth metals,resulting in increased storage capacity through interactions with the charge density of these ***,there is a great demand to critically review their role such as well-defined topology,pore structure,good thermal stability,and tunable hydrophilicity in enhanced hydrogen *** article aimed to critically review the recent research findings based on modified zeolite performance for enhanced hydrogen *** of the factors affecting the hydrogen storage capacities of zeolites that can affect the rate of reaction and the stability of the adsorbent,like pressure,structure,and morphology were studied,and ***,future perspectives,recommendations,and directions for modified zeolites were discussed.

关键词： Zeolites Hydrogen storage surface modification Adsorption Active metal

Tree growth is more limited by drought in rear-edge forests most of the times

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Forest Ecosystems 2021年第2期8卷 330-344页

作者： J.Julio Camarero Antonio Gazol Gabriel sangüesa-Barreda Marta Vergarechea Raquel Alfaro-sánchez Nicolás Cattaneo sergio M.Vicente-serrano Instituto Pirenaico de Ecología(IPE-CsIC) Avda.Montañana 1005E-50192 ZaragozaSpain Ei FAB-iu FOR University of ValladolidCampus Duques de SoriaE-42004 SoriaSpain NIBIO Norwegian Institute of Bioeconomy ResearchPostboks 155NO-1431ÅsNorway Department of Biology Wilfrid Laurier UniversityN2L 3C575 Univ.Avenue WWaterlooOntarioCanada

Background:Equatorward,rear-edge tree populations are natural monitors to estimate species vulnerability to climate *** to biogeographical theory,exposition to drought events increases with increasing aridity towards the equator and the growth of southern tree populations will be more vulnerable to drought than in central ***,the ecological and biogeographical margins can mismatch due to the impact of ecological factors(topography,soils)or tree-species acclimation that can blur large-scale geographical imprints in trees responses to drought making northern populations more drought ***:We tested these ideas in six tree species,three angiosperms(Fagus sylvatica,Quercus robur,Quercus petraea)and three gymnosperms(Abies alba,Pinus sylvestris and Pinus uncinata)by comparing rear-edge tree populations subjected to different degrees of *** used dendrochronology to compare the radial-growth patterns of these species in northern,intermediate,and southern tree populations at the continental rear *** and conclusions:We found marked variations in growth variability between species with coherent patterns of stronger drought signals in the tree-ring series of the southern populations of ***,***,and *** was also observed in species from cool-wet sites(*** and ***),despite their limited responsiveness to ***,in the case of *** the intermediate population showed the strongest relationship to *** drought-sensitive species as *** and ***,southern populations presented more variable growth which was enhanced by cool-wet conditions from late spring to *** found a trend of enhanced vulnerability to drought in these two *** response of tree growth to drought has a marked biogeographical component characterized by increased drought sensitivity in southern populations even within the species distribution rear ***,the relationship

关键词： Climate change Dendroecology Latitudinal gradient Mediterranean forests standardized evapotranspiration precipitation index(sPEI)

Pharmacological approach to restoring steroid sensitivity in respiratory diseases

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中国药理学与毒理学杂志 2018年第4期32卷 242-243页

作者： W.s. Fred WONG Department of Pharmacology Yong Loo Lin School of Medicine National University Health System 117600 Singapore Immunology Program Life Science Institute National University of Singapore 117456 Singapore singapore-HUJ Alliance for Research a

Inhaled corticosteroid is the first-line controller for asthma and ***,about 10% of the asthmatics(severe/refractory asthma) and most of the COPD patients are resistant to the beneficial effects of *** is a pressing unmet medical need to develop novel therapeutic agents to restore corticosteroid efficacy in affected *** have been reports showing the promise of theophylline and rapamycin in reversing steroid resistance in *** laboratory has demonstrated that andrographolide,a bioactive diterpenoid lactone isolated from the plant Andrographis paniculata,is an effective anti-inflammatory and anti-oxidative compound in both asthma and COPD experimental *** a severe asthma mouse model using combined IFN-γ/LPs exposure,production of IL-27 and methacholine-induced airway hyperresponsiveness(AHR) were found to be *** was found to restore the anti-inflammatory effect of dexamethasone in LPs/IFN-γ-induced IL-27 levels in bronchoalveolar lavage(BAL) fluid and AHR in ***/IFN-γ markedly reduced the nuclear level of histone deacetylase-2(HDAC2),an essential epigenetic enzyme that mediates corticosteroid anti-inflammatory *** significantly restored nuclear HDAC2 levels and diminished total HAT/HDAC activity ratio in mouse lungs exposed to LPs/IFN-γ,probably via suppression of PI3K/Akt/HDAC2 phosphorylation and up-regulation of the antioxidant transcription factor Nrf2 *** a cigarette smoke(Cs)-induced COPD model,andrographolide markedly restored dexamethasone actions in inhibiting Cs-induced lung *** addition,andrographolide facilitated dexamethasone actions to suppress BAL fluid IL-6,IL-1b,KC and IL-17 *** lung lysates,andrographolide markedly restored total nuclear HDAC *** complete steroid re-sensitization mechanism of andrographolide remains to be ***,our existing data strongly implicate a potentially novel steroid re

关键词：皮质类固醇治疗方法药物治疗哮喘

用于紫外光下氰化物光催化氧化的含硫纳米复合材料的制备和表征(英文)

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催化学报 2015年第5期36卷 698-704页

作者： E.s.Baeissa Chemistry Department Faculty of Science King Abdulaziz University

A sol-gel method was used to prepare TiO_2 and sulfur-TiO_2(s-TiO_2) nanocomposites, which were characterized by N_2 adsorption-desorption, X-ray diffraction, X-ray photoelectron spectroscopy, photoluminescene, ultraviolet visible and transmission electron microscopy measurements. The photocatalytic performance of TiO_2 and s-TiO_2 nanocomposites, with respect to the photocatalytic oxidation of cyanide under visible light irradiation, was determined. The results reveal that s is well dispersed on the surface of TiO_2 nanoparticles. Additionally, the surface area of the s-TiO_2 nanocomposites was observed to be smaller than that of the TiO_2 nanoparticles because of blocked pores caused by doping with s. The s-TiO_2 nanocomposite(0.3 wt% s) exhibited the lowest band gap and the highest photocatalytic activity in the oxidation of cyanide. The photocatalytic performance of s-TiO_2(0.3 wt% s) nanocomposites was stable, even after the fifth reuse of the nanoparticles for the oxidation of cyanide.

关键词：二氧化钛纳米颗粒纳米复合材料可见光照射光催化氧化氧化特性氰化物 X射线光电子能谱透射电子显微镜

Investigation of seismotectonics and seismicity in south of Caspian sea

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地学前缘 2009年第S1期16卷 52-53页

作者： Z.s.Riazi-Rad Chaloos Branch Islami Azad University

In this study region,those fault-lines with northwestern -southeastern trend are the oldest structures of the region,whose formation is believed to date back to orogeny phase of *** the mentioned trend the northwestern southwestern trends also had outcrop in the studied region and recent seismic data indicate that in the studied region the active presence of North Firouzabad transpressional fault-line causes formation of fault scarps and very deep valleys

关键词： seismotectonics seismicity Caspian sea risk

Manual and alternative therapies as non-pharmacological interventions for pain and stress control in newborns:a systematic review

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World Journal of Pediatrics 2023年第1期19卷 35-47页

作者： Leva A.shayani Vera Regina F.da s.Maraes University of Brasilia BrasiliaBrazil

Background supporting therapies that provide stress and pain control of preterm and term newborns infants contribute positively to the neuropsychomotor ***-pharmacological interventions that involve manual techniques are described,considering protocols that can be reproduced by physical therapists,with positive and negative outcomes *** sources systematic review follows PRIsMA 2020 statements *** and specific health sciences databases(science Direct,Pubmed,scielo,Embase and scopus)were consulted between October 2021 and May *** con-sidered were clinical trials,randomized or not,that included descriptions of the type of intervention as non-pharmacological and that studied the following outcomes:"pain"and"stress".Results Fifteen articles were selected for analysis,reaching a methodological quality of at least 3 on the Jadad scale for the Quality of Researched *** non-pharmacological therapies most applied in isolation were massage,swaddling or wrapping,gentle touch and kinesthetic stimulation,and the combined therapies were non-nutritive sucking and swad-dling,oral sucrose and swaddling,sensory stimulation and familiar odors,and sensory *** outcomes found were relaxation,pain,and stress reduction after the application of painful *** behavioral changes included crying,grimacing,yawning,sneezing,jerky arm or leg movements,startles,and finger *** vital signs included heart rate,blood oxygen saturation level,and pulse *** Combined techniques lead to better results in controlling neonatal pain when compared to isolated *** can be applied both in preterm and term infants in a safe way and are reproducible in any health unit in a simple and economical way.

关键词： Newborn Non-pharmacological interventions Pain Premature neonate stress

Potentials of GaP as millimeter wave IMPATT diode with reference to si,GaAs and GaN

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红外与毫米波学报 2019年第4期38卷 395-402页

作者： Janmejaya Pradhan s K swain s R Pattnaik G N Dash College of Engineering Bhubaneswar Bhubaneswar Odisha 752024 India National Institute of science and Technology Berhampur Odisha 761008 India school of Physics Sambalpur University Sambalpur Odisha 768019 India

This paper presents the simulation results of DC,small-signal and noise properties of GaP based Double Drift Region( DDR) Impact Avalanche Transit Time( IMPATT) diodes. In simulation study we have considered the flat DDR structures of IMPATT diode based on GaP,GaAs,si and GaN( wurtzite,wz) material. The diodes are designed to operate at the millimeter window frequencies of 94 GHz and 220 GHz. The simulation results of these diodes reveal GaP is a promising material for IMPATT applications based on DDR structure with high break down voltage( V_B) as compared to si and GaAs IMPATTs. It is also encouraging to worth note GaP base IMPATT diode shows a better output power density of 4. 9 × 10~9 W/m^2 as compared to si and GaAs based IMPATT diode. But IMPATT diode based on GaN( wz) displays large values of break down voltage,efficiency and power density as compared to si,GaAs and GaP IMPATTs.

关键词： lmpact avalanche transit time(IMPATT) GaP GaN microwave and millimetre wave

The transition from backarc extension to Andean growth:Insights from geochronologic,sedimentologic,and structural studies of Mesozoic and Cenozoic sedimentary and volcanic rocks in south-central Chile(36°s)

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Geoscience Frontiers 2024年第5期15卷 93-117页

作者： Alfonso Encinas Nicolás Henríquez Daniel Castro Darío Orts Diego Kietzmann Franco Iovino Paulo Vásquez Andrés Folguera Victor Valencia Facundo Fuentes Departamento de Ciencias de la Tierra Facultad de Ciencias QuímicasUniversidad de ConcepciónVíctor Lamas 1290Concepción 4030000Chile Universidad Nacional de Río Negro.Instituto de Investigación en Paleobiología y Geología.General Roca Río NegroArgentina Instituto de Investigación en Paleobiología y Geología(IIPG).CONICET.Av.J.A.Roca 1242 8332 General RocaRío NegroArgentina Universidad de Buenos Aires Facultad de Ciencias Exactas y NaturalesDepartamento de Ciencias GeológicasCiudad UniversitariaPabellón ⅡIntendente Güiraldes 2160C1428EHA Ciudad Autónoma de Buenos AiresArgentina CONICET-Universidad de Buenos Aires Instituto de Geociencias BásicasAmbientales y Aplicadas de Buenos Aires(IGeBA)Ciudad UniversitariaPabellón ⅡIntendente Güiraldes 2160C1428EHA Ciudad Autónoma de Buenos AiresArgentina Instituto de Estudios Andinos“Don Pablo Groeber”(IDEAN) CONICET-Universidad de Buenos AiresBuenos AiresArgentina Facultad de Ciencias Exactas y Naturales Universidad de Buenos AiresBuenos AiresArgentina Washington state University School of the EnvironmentPullmanUSA Yacimientos Petrolíferos Fiscales(YPF)s.A. Buenos AiresArgentina

Many studies propose a significant shift in the tectonic and paleogeographic evolution of the Andes in south-central Chile and Argentina during the Late *** has been proposed that the preceding Jurassic-Early Cretaceous extensional regime that resulted in a low-relief volcanic arc and the backarc Neuquén basin came to an end,giving way to shortening and Andean growth from the Late Cretaceous ***,there are disagreements regarding the timing and nature of this transition to Andean *** address these issues,we conducted geochronologic(U-Pb and^(40)Ar/&(39)Ar),sedimentologic,and structural studies on Mesozoic-Cenozoic sedimentary and volcanic rocks in the Río Maule area(Principal Cordillera,Chile,36°s).From our findings and prior analyses,we propose the following tectono-stratigraphic evolution of the region.(1)Marine deposition of the Tithonian-Hauterivian Baños del Flaco Formation took place in an extensional backarc basin.(2)After a~40 Myr hiatus,fluvial deposits of the Colimapu Formation and volcanic rocks of the Plan de los Yeuques Formation accumulated during the *** the Colimapu Formation displays evidence of syndepositional shortening,the Plan de los Yeuques Formation exhibits synextensional growth *** to other studies,our results suggest that the Chilean part of the Principal Cordillera was largely a zone of active deposition rather than an elevated fold-thrust belt during the Late *** propose that sedimentation occurred within a series of relatively stable intermontane subbasins generated by shortening,followed by extension.(3)After a~20 Myr hiatus,middle Eocene to early Miocene(Lutetian-Aquitanian)accumulation of a thick succession of andesitic lavas and minor clastic sediments of the Abanico Formation occurred in an intraarc extensional basin.(4)Finally,major shortening and uplift of previously deposited Mesozoic-Cenozoic rocks took place throughout the *** phase constitu

关键词： Andes south-central Chile Backarc basin Foreland basin Fold-thrust belt

Tree clusters migration into alpine tundra,siberia

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Journal of Mountain science 2022年第12期19卷 3426-3440页

作者： KHARUK Viacheslav I. PETROV II'ya A. IM sergei T. GOLYUKOV Alexey s. DVINsKAYA Maria L. sHUsHPANOV Alexander s. sukacheu Institute of Forest Federal Scientific CenterRussian Academy of ScienceSiberian BranchAcademgorodok 50/28Krasnoyarsk 660036Russia siberian Federal University Svobodny str.79Krasnoyarsk 660041Russia Reshetneu siberian state University of science and Technology Krasnoyarsky rabochy str.31Krasnoyarsk 66014Russia Tomsk state University Leninastr.36Tomsk 634050Russia

We hypothesize that in mountain windy habitat trees formed clusters(hedges)as adaptive structures for seedlings’rooting,survival,and tress’upslope *** studied hedges formed by siberian pine(Pinus sibirica du Tour)and larch(Larix sibirica Ledeb.)within the treeline ecotone in southern siberian Mountains,investigated hedges formation,evolution,habitat amelioration,and analyzed tree’s growth index(GI)dependence on the eco-climate variables(air temperature,precipitation,soil moisture,wind speed)and relief features(elevation,aspect,slope steepness,and terrain curvature).We conducted a ground survey,measured biometrical parameters of trees and hedges,determined species composition and tree physiognomy,soil types and nutrient contents,and sampled wood cores and applied dendrochronology for trees’GI *** high-resolution satellite scenes for hedge detection and upslope migration,we found that winter winds and soil moisture are the main constraints of trees’settlement and *** formation always links with wind-sheltered microtopography features(boulders,local depressions or felled trees).Once the first tree is established,a positive feedback is aroused that facilitates seedling rooting and in-hedge habitat *** form a streamlined dense“common crown”that mitigates adverse winter wind *** always orient along the prevailing winds,and trees’uphill migration occurs by seedlings establishment within the leeward hedge *** growth facilitates soil formation and *** concentration of nutrients(K,P,N and s)within hedges exceeds the background by 1.5-5.5 *** extension leads to increased snow accumulation that mitigates the influence of desiccation and snow abrasion and mitigates seasonal water *** the extremely harsh windy habitat,inhedge trees present in mat,prostrate or krummholz *** warming,tree stems and even twigs turn *** that GI dependence on the wind speed is insignificant unt

关键词： Treeline Timberline Hedges Tree migration siberian pine Larch Tree growth siberian mountain forests Wind stress Moisture stress