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On q-n-gonal Klein Surfaces

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Acta Mathematica Sinica,English Series 2007年第10期23卷 1833-1844页

作者： b.estrada R.A.HIDALGO E.MARTINEZ Departamento de Matemáticas Fundamentales UNEDPaseo Senda del Rey 928040 MadridSpain Departamento de Matemática Universidad Técnica Federico Santa MaríaCasilla 110-V ValparaisoChile

We consider proper Klein surfaces X of algebraic genus p ≥ 2, having an automorphism φ of prime order n with quotient space X/（φ） of algebraic genus q. These Klein surfaces axe called q-n-gonal surfaces and they are n-sheeted covers of surfaces of algebraic genus q. In this paper we extend the results of the already studied cases n ≤ 3 to this more general situation. Given p ≥ 2, we obtain, for each prime n, the （admissible） values q for which there exists a q-n-gonal surface of algebraic genus p. Furthermore, for each p and for each admissible q, it is possible to check all topological types of q-n-gonal surfaces with algebraic genus p. Several examples are given： q-pentagonal surfaces and q-n-gonal bordered surfaces with topological genus g = 0, 1.

关键词： Klein surfaces Riemann surfaces automorphism groups non-Euclidean crystallographic groups

Prospects for ASEAN-China Free Trade Area:A Qualitative and Quantitative Analysis

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China & World Economy 2009年第4期17卷 104-120页

作者： Donghyun Park Innwon Park Gemma Esther b.estrada Economic and Research Department Asian Development Bank Division of International Studies Korea University

The current global financial and economic crisis is giving new life to initiatives that promote closer economic integration among East Asian countries. A significant example is the ASEAN- China Free Trade Area （.4 CFTA）, which is set to come into effect around 2010..4CFTA aims to boost trade between two economies that are partners as well as competitors： ASEAN and China. In the present paper, we use insights from customs union theory in a qualitative analysis considering whether,4CFTA would benefit both sides. We also apply a computable general equilibrium model to perform a quantitative analysis of the same issue. both our qualitative and quantitative analyses provide grounds for guarded optimism regarding A CFTA ＇s prospects as a vehicle for strengthening the economic partnership between ASEAN and China.

关键词： ASEAN China computable general equilibrium model economic integration free trade area

AIdeal:Sentience and Ideology

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Journal of Social Computing 2023年第4期4卷 275-325页

作者： Daniel estrada the Department of Humanities and Social Sciences New Jersey Institute of TechnologyNewarkNJ 07102USA

This paper addresses a set of ideological tensions involving the classification of agential kinds,which I see as the methodological and conceptual core of the sentience ***,I consider ideals involved in the classification of biological and artifactual kinds,and ideals related to agency,identity,and *** ideals frame the background against which sentience in Artificial Intelligence(AI)is theorized and debated,a framework I call the *** make this framework explicit,I review the historical discourse on sentience as it appears in ancient,early modern,and the 20th century philosophy,paying special attention to how these ideals are projected onto artificial agents.I argue that tensions among these ideals create conditions where artificial sentience is both necessary and impossible,resulting in a crisis of *** past this crisis does not require a satisfying resolution among competing ideals,but instead requires a shift in focus to the material conditions and actual practices in which these ideals *** Charles Mills,I sketch a nonideal approach to AI and artificial sentience that seeks to loosen the grip of ideology on the ***,I propose a notion of participation that deflates the sentience discourse in AI and shifts focus to the material conditions in which sociotechnical networks operate.

关键词： sentience agency artifacts artificial intelligence ideology nonideal theory natural kinds participation

Neuroinflammation revisited through the microglial lens

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Neural Regeneration Research 2025年第7期20卷 1989-1990页

作者： Renato Socodato João b.Relvas Institute of Research and Innovation in Health(i3S)and Institute for Molecular and Cell biology(IbMC) University of PortoPortoPortugal Department of biomedicine Faculty of Medicine of the University of Porto(FMUP)PortoPortugal

Neuroimmunology is emerging as a pivotal field,shedding light on the intricate dialogues between the central nervous system(CNS)and the immune *** exploration is particularly significant in understanding microglia,the CNS’s innate immune cells,beyond the conventional conflation of“neuroinflammation”and“microglial activation.”This conflation has clouded the true complexity of these processes,potentially stalling scientific progress and the development of new *** challenge the long-standing perspectives that have oversimplified these interactions,advocating for a deeper exploration of the dynamic relationship between neuroinflammation and microglial *** dissecting specific molecular pathways,we aim to illuminate their elaborate roles in neuroinflammatory responses,especially in the context of Alzheimer’s disease(AD).Here,neuroinflammation is not merely a passive observer or a direct antagonist but a complex agent in the disease’s *** article calls for a significant paradigm shift towards an integrative,multi-omics approach to *** such a comprehensive framework is crucial for advancing our understanding of neuroinflammatory conditions and paving the way for targeted therapeutic strategies for brain diseases.

关键词： inflammation simplified activation

Clinical outcomes with a new microincisional diffractive multifocal IOL

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Eye and Vision 2015年第1期2卷 7-15页

作者： Jorge L Alió Alfredo Vega-estrada Ana b Plaza-Puche Vissum Corporation AlicanteSpain Division of Ophthalmology Universidad Miguel HernándezAlicanteSpain Avda de Denia s/n Edificio Vissum03016 AlicanteSpain

background:To evaluate the refractive outcomes and the optical performance as well as the quality of life in patients implanted with a new diffractive multifocal intraocular lens(IOL).Methods:Prospective,clinical study including 41 cases of patients who underwent cataract surgery and were divided in two groups:group 1,including 20 eyes implanted with the multifocal IOL SeeLens MF(Hanita Lenses,Israel);group 2,21 eyes implanted with the Acrysof SA60AT *** acuity,defocus curve,intraocular aberrations,contrast sensitivity function and quality of life were assessed during a follow up period of 6 ***:Significant improvement was observed in the uncorrected distance visual acuity(UDVA)and corrected distance visual acuity(CDVA)in both groups(pbetter results in terms of uncorrected near visual acuity(UNVA)and distance-corrected near visual acuity(DCNVA)(pboth groups showed better visual acuities for the multifocal IOL group in defocus levels from-3.0 D to-1.50 D(p≤0.01).At 6 months,there was a significant reduction of the internal higher order aberrations(p≤0.04).A significant increase in scotopic contrast sensitivity was detected for 6 cycles/°spatial frequency during follow up(p=0.04),but no significant changes were observed for the rest of spatial frequencies(p≥0.06).Visual Functioning Index(VF-14)questionnaire showed that patients reported high levels of satisfaction when performing daily ***:The SeeLens MF IOL is able to successfully restore distance,near and intermediate visions after cataract *** also provides functional intermediate vision with optimal intraocular optical quality.

关键词： Visual visual IOL

Gorenstein injective sheaves

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Frontiers of Mathematics in China 2017年第1期12卷 87-95页

作者： Sergio estrada Alina IACOb Departamento de Matem~ticas Universidad de Murcia Murcia 30100 Spain Department of Mathematical Sciences Georgia Southern University Statesboro GA 3O460 USA

We define Gorenstein injective quasi-coherent sheaves, and prove that the notion is local in case the scheme is Gorenstein. We also give a new characterization of a Gorenstein scheme in terms of the total acyclicity o... 详细信息

关键词： Gorenstein injective Noetherian scheme

Study of branes with Variable Tension

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Communications in Theoretical Physics 2017年第11期67卷 595-599页

作者： Rodrigo Aros Milko estrada Departamento de Ciencias Fisicas Universidad Andres Bello Department of Physics Universidad de Antofagasta Instituto de Matematica Fisica y Estadistica Universidad de las Americas

In this work we study a brane world model with variable tension, which gives rise to four-dimensional cosmologies. The brane worlds obtained correspond to E?tv?s branes whose(internal) geometry can be casted as either a four-dimensional(A)dS_4 or a standard radiation period cosmology. The matter dominated period is discussed as well.

关键词： Randall–Sundrum brane world de Sitter hierarchy problem brane tension

Risk factors connected to gastrointestinal parasites in mantled Alouatta palliata mexicana and black howler monkeys Alouatta pigra living in continuous and in fragmented rainforests in Mexico

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Current Zoology 2012年第3期58卷 375-383页

作者： Genoveva TREJO-MACIAS Alejandro estrada Estacien de biologfa Tropical Los Tuxtlas Instituto de BiologiaUNAMCircuito Exterior junto a Jardfn BotainicoM6xicoDEMexico

In this study we document the prevalence of gastrointestinal parasites （helminths and protozoans） found in fecal samples of populations of Alouatta palliata mexicana and ofA. pigra in Los Tuxtlas and in Palenque, southeast Mexico, and its re- lation to habitat condition, sex/age and season. Nineteen parasite morphotypes were detected in the fecal samples from populations of the two howler monkeys, of which 58% were shared by both species. When considering all parasite species, populations of the two howler species were more likely to be parasitized in fragmented habitat compared to continuous habitat. Individuals of both howler monkey species that lived in fragmented habitat had a higher prevalence of Controrchis biliophilus. A. p. mexicana individuals had a higher prevalence of Trypanoxyuris minutus than A. pigra, probably the result of the larger group sizes found in the former species, and T. minutus was more likely to be found in A. palliata individuals that lived in fragmented habitat. Adult A. p. mexicana males had a higher risk of being parasitized compared to adult females, but these differences were not detected in A. pigra, Parasite species such as Entamoeba sp., Nematoda sp. 28, Nematoda sp. b and Parabronema sp. where only found during the wet season in both howler monkey species. Populations of both howler monkey species had a higher prevalence of Nematoda sp. A in the wet season and Ascaridae eggs were only detected during the wet season in A. pigra. Other parasites detected displayed no clear seasonal pattern [Current Zoology 58 （3）： 375-383, 2012].

关键词： Gastrointestinal parasites Habitat fragmentation Seasonality Alouatta palliata mexicana Alouatta pigra Mexico

Acyclic Complexes and Gorenstein Rings

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Algebra Colloquium 2020年第3期27卷 575-586页

作者： Sergio estrada Alina Iacob Holly Zolt Departamento de Matematicas Universidad de MurciaMurcia 30100Spain Department of Mathematical Sciences Georgia Southern University StatesboroGA 30460-8093USA

For a given class of modules A,let A be the class of exact complexes having all cycles in A,and dw(A)the class of complexes with all components in *** by GL the class of Gorenstein injective *** prove that the following are equivalent over any ring R:every exact complex of injective modules is totally acyclic;every exact complex of Gorenstein injective modules is in every complex in dw(GL)is dg-Gorenstein *** analogous result for complexes of flat and Gorenstein flat modules also holds over arb计rary *** the ring is n-perfect for some integer n≥0,the three equivalent statements for flat and Gorenstein flat modules are equivalent with their counterparts for projective and projectively coresolved Gorenstein flat *** also prove the following characterization of Gorenstein *** R be a commutative coherent ring;then the following are equivalent:(1)every exact complex of FP-injective modules has all its cycles Ding injective modules;(2)every exact complex of flat modules is F-totally acyclic,and every R-modulc M such that M^(+)is Gorenstein flat is Ding injective;(3)every exact complex of injectives has all its cycles Ding injective modules and every R-module M such that is Gorenstein flat is Ding *** R has finite Krull dimension,statements(1)-(3)are equivalent to(4)R is a Gorenstein ring(in the sense of Iwanaga).

关键词： totally acyclic complex Gorenstein injective module Gorenstein projective module Gorenstein flat module Ding injective module