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In-depth analysis of soil management and farmers’perceptions of related risks in two olive grove areas in southern Spain

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International Soil and Water Conservation Research 2021年第3期9卷 461-473页

作者： José A.Gòmez Ana Sanchez Montero gema.guzman Marfa-Auxiliadora Soriano a Institute for Sustainable Agriculture CSICCordobaSpain Agronomy Department University of CordobaCordobaSpain

This manuscript presents a questionnaire-based study aimed to provide a detailed analysis on the different soil management carried out by olive farmers in two representative olive-growing areas in southern Spain(Cordoba and Estepa),their perceptions on cover crop use and the possible influence of the different types of farms and farmers’typologies on these *** results show a relatively large variability of soil management,with fourteen options,as a result of a combination of different alternatives for bare soil and cover crops with the use or not of pruning residues,but with a great similarity between both *** results indicate a high adoption of soil conservation measures in the two study areas,with 63%of farmers using cover crops and 80%a mulch of pruning residues,higher than that reported in previous studies in Southern Spain,and a trend of lower use of these techniques by less experienced and younger *** high penetration of soil conservation measures resulted in a significant reduction of soil erosion risk,as indicated by the relatively low values for the cover and management factor(C)of RUSLE,also calculated and presented in this study,but also the possibility of focusing further efforts on fanners with less *** results indicate the persistence of a minor,but relevant,percentage of farmers using bare soil management(37%)and no mulching(20%),with a moderate concern on the impact of soil erosion on soil degradation and provision of ecosystem *** suggests the need to concentrate efforts also on this cluster of farmers to enhance the success of what seems to be a remarkable expansion of the use of soil conservation measures in recent decades in Southern Spain,but also in similar areas in the Mediterranean basin.

关键词： Tillage Cover crops Olive yield Erosion risk Irrigation Questionnaire

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Harmonic functions with boundary values on Herz spaces

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Frontiers of Mathematics in China 2013年第6期8卷 1265-1274页

作者： Martha guzman-PARTIDA Departamento de Matematicas Universidad de Sonora Rosales y Luis Encinas HermosilloSonora 83000 Mexico

We discuss continuity of the Poisson transform on Herz spaces Bp as well as its action on weighted versions of these sets. We also consider Banach- valued versions of Herz spaces and study some of their properties.

关键词： Herz space Poisson transform

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EXTRACTING BEHAVIOURAL MODELS FROM 2010FIFA WORLD CUP

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Journal of Systems Science & Complexity 2013年第1期26卷 43-61页

作者： MENNDEZ Héctor BELLO-ORGAZ gema CAMACHO David Department of Computer Science Universidad Autnoma de Madrid

The FIFA World Cup^(TM) is the most profitable worldwide *** FIFA publishes global statistics of this competition which provide global data about the players and teams during the *** work is focused on the extraction of behavioural patterns for both,players and teams strategies,through the automated analysis of this *** knowledge and models extracted in this work could be applied to soccer leagues or even it could be oriented to sport ***,the main contribution is related to the study on several automatic knowledge extraction techniques,such as clustering methods,and how these techniques can be used to obtain useful behavioural models from a global statistics *** information provided by the clustering algorithms shows similar properties which have been combined to define the models,making the human interpretation of these statistics ***,the most successful teams strategies have been analysed and compared.

关键词： Behavioural patterns clustering FIFA World Cup football soccer web mining.

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A Note on Expanding Planar Real Cellular Automata

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Acta Mathematica Sinica,English Series 2018年第9期34卷 1371-1378页

作者： Jairo guzman Neptali ROMERO Universidad del Atldntico Facultad de Ciencias Bdsicas Departamento de Matematicas Km 7 antigua via Puerto Colombia Barranquilla Colombia Universidad Centroccidental Lisandro Alvarado Decanato de Ciencias y Tecnologia Departamento de Matematica Nucleo Obelisco Barquisimeto Venezuela

In this paper, we deal with one-parameter families of real cellular automata in R2. We prove that for a wide class of block functions from R2 to R, the corresponding real cellular automaton is expanding when the value... 详细信息

关键词： Real cellular automata block function expanding map

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Tropical Cyclones in Nicaragua:Historical Impact and Contemporary Exposure to Disaster Risk

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International Journal of Disaster Risk Science 2024年第4期15卷 579-593页

作者： gema Velásquez‑Espinoza Irasema Alcántara‑Ayala Faculty of Sciences and Engineering National Autonomous University of Nicaragua14172 Unan-ManaguaNicaragua Postgraduate Programme in Geography National Autonomous University of Mexico(UNAM)04510 Mexico CityMexico Institute of Geography National Autonomous University of Mexico(UNAM)04510 Mexico CityMexico

In tropical regions such as Nicaragua, the population's vulnerability to hazards has escalated in recent decades. This increase in vulnerability has led to a surge in disasters, particularly those triggered by intense hurricanes. The implications at the national level are still poorly understood. The aim of this article has, therefore, been two-fold. First, to present a historical review of the direct effects of tropical cyclones on society in Nicaragua from 1852 to 2020. Second, to analyze the statistical probabilities of future hurricane-spawned high winds over Nicaragua. Data on cyclones hitting Nicaragua's coasts were collected, including direct effects, wind speed, pressure, category, direction, and time of landfall. A database was created to classify intensity based on wind speed and frequency. Between 1852 and 2020, Nicaragua experienced 58 tropical cyclones with varying degrees of intensity between September and November. The trajectories of six past hurricanes were considered here regarding the areas that might have been under potential threat. Three zones of influence were delimited along each trajectory according to three wind intensities and the trajectory of these hurricanes. The consequent exposure of each Nicaraguan department and autonomous region was established. The findings are essential to delimitating priority areas for attention regarding the likely impact of tropical cyclones, mainly category 4 and 5 hurricanes. Public officials and the general public can use these data to identify the pressing need for enhanced strategies to mitigate disaster risk and avoid potential disasters.

关键词： Exposure Historical impact Hurricanes Nicaragua Tropical cyclones Vulnerability

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Inhibition of p53 inhibitors:progress,challenges and perspectives

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Journal of Molecular Cell Biology 2019年第7期11卷 586-599页

作者： gema Sanz Madhurendra Singh Sylvain Peuget Galina Selivanova Department of Microbiology Tumor and Cell BiologyBiomedicum 8CKarolinska InstituteSE17165Sweden

p53 is the major tumor suppressor and the most frequently inactivated gene in cancer.p53 could be disabled either by mutations or by upstream negative regulators,including,but not limited to MDM2 and MDMX.p53 activity is required for the prevention as well as for the eradication of *** of p53 activity in mouse models leads to the suppression of established tumors of different *** findings provide a strong support to the anti-cancer strategy aimed for p53 *** this review,we summarize recent progress in the development of small molecules,which restore the tumor suppressor function of wild-type p53 and discuss their clinical *** discuss different aspects of p53-mediated response,which contribute to suppression of tumors,including non-canonical p53 activities,such as regulation of immune *** targeting p53 inhibitors is a very promising approach,there are certain limitations and concerns that the intensive research and clinical evaluation of compounds will hopefully help to overcome.

关键词： p53 tumor suppression anti-cancer therapy targeted drugs transcription factor immune response

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Technical reports and theoretical studies about the structural behaviour of masonry domes in the 18th century

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Frontiers of Architectural Research 2023年第1期12卷 42-66页

作者： gema M.Lopez-Manzanares Department of Architecture Universidad de AlcalaAlcala´de HenaresSpain

The development of the scientific theory on the stability of vaulted structures was driven mainly during the 18th century based on applying the laws of Mechanics and the knowledge of the properties of *** the specific case of structures such as domes,the development of the theory is closely related to the theory of arches and ***,the main contributions are made in technical reports on the construction,stability,and repair of domes,such as the dome of Saint Peter’s in Rome and Sainte-Genevie`ve or Pantheon in *** article,therefore,analyses the relationship between theory and practice and the development achieved in the specific subject of masonry domes during the 18th century from the point of view of the Limit Analysis of Masonry *** a more general sense,the objective of this research is to study in greater depth the theory of Limit Analysis itself,that is,to learn from the work carried out in the 18th century by mathematicians,architects,and engineers,who,although unaware of the existence of the theoretical framework of Limit Analysis as such,moved within it.

关键词： Structural analysis Masonry structures Limit analysis Technical reports Pathology Reinforcement Iron rings Domes

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Spatial variability of soil organic carbon stock in an olive orchard at catchment scale in Southern Spain

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International Soil and Water Conservation Research 2023年第2期11卷 311-326页

作者： Jose A.Gòmez gema Guzmán Tom Vanwalleghem Karl Vanderlinden Institute for Sustainable Agriculture.Spanish National Research Council(IAS-CSIC) Alameda del Obispo S/N14004CordobaSpain Department of Agronomy University of CordobaCampus de Rabanales14071CordobaSpain Centro IFAPA Alameda del Obispo 14004CordobaSpain

Orchards have a high potential for carbon ***,little research is available on the spatial variability at catchment scale and on the difference between the tree area and the *** analyzed theik spatial variability of soil organic carbon stock,SOCstock at 90 cm depth in an 8-ha catchment in Southern Spain with olives on a vertic *** showed higher soil organic carbon concentration,SOC,in the tree area as compared to the lane up to 60 cm depth,but its impact on SOCstock was negligible since it was compensated by the higher soil bulk density in the *** at different depths was correlated with that in the top 0-5 *** overall SOCstock of the orchard was 4.14 kg m^(-2),ranging between 1.8 and 6.0 kg m^(-2).This SOCstock is in the mid-lower range of values reported for olive orchards,measured at smaller scale,and similar to those other intensive field crops and agroforestry under comparable rainfall *** spatial variability in SOCstock was correlated to several geomorphological variables:elevation,cumulative upstream area,topographic wetness index,sediment transport index,and tillage *** in SOC and SOCstock are driven by the sediment redis-tribution downslope,mainly by tillage erosion,and higher soil water availability in lower areas allowing higher biomass *** topographic indexes and the correlation between SOC in the topsoil and SOCstock up to 90 cm should be further explored in other typology of olive orchards for facilitating the mapping of SOC_(stock).

关键词： Carbon sequestration Mediterraneancrops Catchment Spatial variability Vertic soils

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Preliminary Optimization and Kinetics of SnCl_(2)-HCl Catalyzed Hydrothermal Conversion of Microcrystalline Cellulose to Levulinic Acid

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Journal of Renewable Materials 2021年第1期9卷 145-162页

作者： Dexby de guzman Rizalinda de Leon Fuels Energy and Thermal Systems LaboratoryDepartment of Chemical EngineeringUniversity of the PhilippinesQuezon City1101Philippines

Levulinic acid(LA)is a platform biorefinery chemical from biomass which can be converted to green solvents,plasticizers,polymer precursors,biobased cleaning agents,fuels and fuel *** study assessed the potential of SnCl_(2)-based mixed acid systems as catalyst in the hydrothermal conversion of microcrystalline cellulose to levulinic *** LAyield of 36.2 mol%was achieved using 0.2 M SnCl_(2) concentration at test conditions of 3 h,180℃ and 1%w/v cellulose *** reduce precipitate formation and further improve LA yield,the strategy employed was to combine SnCl_(2)(a Lewis acid)with conventional mineral acids(Bronsted acids).Evaluation of the catalytic performance of SnCl_(2)-HCl,SnCl_(2)-H_(2)SO_(4),SnCl_(2)-HNO_(3),and SnCl_(2)-H_(3)PO_(4)(1:1 molar ratio,0.2 M total acid concentration)were done with highest LA yield of 47.0 mol%obtained using the SnCl_(2)-HCl system at same test *** surface methodology optimization employing Box-Behnken design generated a quadratic model with a high coefficient of determination(r2)of 0.964.A maximum LA yield of 63.5 mol%can be achieved at 0.17 M catalyst concentration,198℃,and 5.15 h reaction *** constants were estimated using nonlinear regression,while activation energies were determined using Arrhenius *** hydrolysis was determined to be the rate-limiting step in the overall *** activation energy of 63.3 kJ/mol for glucose dehydration to hydroxymethylfurfural supports the action of SnCl_(2) as Lewis acid in the mixed-acid *** yield simulations for plug flow reactor(PFR)and continuous stirred tank reactor(CSTR)were done suggesting a similar PFR-CSTR configuration with the established Biofine ***,a reaction scheme was presented to explain the synergy between SnCl_(2) and HCl in LA production from cellulose.

关键词： Levulinic acid tin(II)chloride cellulose optimization kinetics

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Does wetland watershed land use influence amphibian larval development? A relevant effect of agriculture on biota

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Journal of Oceanology and Limnology 2019年第1期37卷 160-168页

作者： GARCíA-MU?OZ Enrique GUERRERO Francisco ARECHAGA Garbi?e PARRA gema Departamento de Biología Animal Biología Vegetal y Ecología Campus de las Lagunillas Centro de Estudios Avanzados en Ciencias de la Tierra Campus de las Lagunillas Departamento de Ciencias de la Salud Campus de las Lagunillas

Agriculture practices have been widely proposed as the major cause of amphibian population decline. However, the majority of these results have been based on laboratory experiments. The present study was conducted to test the repercussion of wetland sediment provenance on amphibian larval *** bufo larvae were used in two dif ferent treatments in an outdoor experiment, the ?rst one using sediment from one wetland surrounded by intensive agricultural practices, and the second using sediment with no record of agrochemical uses. A negative ef fect was observed in the agricultural treatment, from subcellular to individual level. The results showed that the sediment from agricultural practices watershed generates a reduction in survival. Furthermore, individuals that developed under this treatment showed a lower total length and a delay in the time necessary to complete metamorphosis; these features are connected with recruitment success. In the same way, biochemical analysis showed high values of lipid peroxidation in metamorphs developing in sediments from an agricultural area. Finally, the results obtained highlight the importance of considering the sediments, not only the water, as origin treatment, allowing us to understand the consequences on amphibian populations that inhabit areas af fected by intensive agriculture.

关键词： amphibian decline Bufo bufo survival ecotoxicology agricultural practices

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