853 research outputs found
Stress and strain analysis and induced seismicity in geological gas storage (Yela, Spain)
Geologic gas storage is a sustainable strategy to store energy in underground reservoirs in order to be used under demand. Injection and withdrawal gas operations could trigger induced seismicity according to the tectonic constrains of the reservoir. The study of the active stress/strain fields shows the properties of the fault patterns that can be involved in induced seismicity. In our work, we have determined the strain/stress field in the Yela underground gas storage, an Upper Cretaceous carbonate reservoir located in central Spain. Slickensides on fault planes were measured from Cretaceous, Miocene and Quaternary rocks. Results show a strain field with ey (maximum horizontal shortening) oriented NW-SE. This field was compressional during the early Miocene, switching off to extensional from late Miocene to present-day. Our results suggest that NNW-SSE and NW-SE oriented faults could act as an effective pathway for gas leakage and prone to trigger induced seismicity. Moreover, 141 small earthquakes (Mmax 2.3) were recorded during underground operations in Yela. Peaks of earthquakes appear seasonally from November to February, in coincidence with the injection operations prior to the winter withdrawal. Working at its maximum gas storage volume, earthquake peaks decreased in intensity and magnitude from 2017 to 2021, and show a time lag of 3 months from the month of maximum volume injection to the earthquake occurrenc
CaracterĂsticas das ondas de desenvolvimento folicular em novilhas Bos taurus indicus prĂŠ-pĂşberes de dois tamanhos diferentes
The purpose of this study was to evaluate in a period of 42 days prior to the onset of puberty (PB), the effects of size (small size and large size) of prepubertal Brahman heifers (BHM) on; age, characteristics of follicular dynamics, and body composition parameters. In addition, the frame score (body structure) was calculated as an additional estimator of height. We defined PB as the first ovulation preceded by the observation of estrus and followed by the formation of a corpus luteum (CL) of normal duration. Prepubertal BHM (10) heifers were used. The feeding was individual with corn silage and commercial concentrate to obtain similar weight gains. Measurements of weight and body condition score (BCS) were performed every 14 d. Ovulation and the formation of the CL were confirmed according to the monitoring of the ovarian structures by ultrasonography. Statistically, correlation analysis and analysis of variance were performed with the GLM procedure of SAS. A significant effect of size on the total number of follicles at PB was found, where small-sized heifers had 16 follicles, while those of large size had 12 follicles at PB (P < 0.0001). The frame score of the undersized animals was 10 % higher than that of the oversized heifers (P < 0.0001). Likewise, the frame score had a significant effect (P < 0.0001) on the total number of follicles in the PB. In conclusion, the effect of height in prepubertal animals is a complex characteristic, associated with body composition parameters, which affects some of the characteristics of follicular dynamics, and is worth further study in Zebu cattle.En un periodo de 42 dĂas previos al inicio de la pubertad (PB), se estudiaron los efectos de la talla (talla chica y talla grande) de vaquillas prepĂşberes de la raza Brahman (BHM) sobre; la edad, caracterĂsticas de la dinĂĄmica folicular y parĂĄmetros de composiciĂłn corporal. AdemĂĄs, se calculĂł el frame score (estructura corporal) como estimador adicional de la talla. La PB fue definida como la primera ovulaciĂłn precedida por la observaciĂłn del estro y seguida por la formaciĂłn de un cuerpo lĂşteo de duraciĂłn normal. Se utilizaron 10 vaquillas BHM. La alimentaciĂłn fue individual con ensilado de maĂz y concentrado comercial para obtenciĂłn de ganancias de peso similares. Se realizaron pesajes y se midiĂł la condiciĂłn corporal (CC) cada 14 d. De acuerdo al monitoreo ultrasonogrĂĄfico de las estructuras ovĂĄricas se confirmĂł la ovulaciĂłn y la formaciĂłn del cuerpo lĂşteo (CL). EstadĂsticamente se realizĂł un anĂĄlisis de correlaciĂłn y anĂĄlisis de varianza con el procedimiento GLM del SAS. Se encontrĂł efecto significativo de la talla sobre el nĂşmero total de folĂculos a la PB, en donde las vaquillas de talla chica registraron 16 folĂculos, mientras que las de talla grande tuvieron 12 folĂculos a la PB (P < 0.0001). El frame score de los animales de talla chica fue 10 % mayor que la de las vaquillas de talla grande (P < 0.0001). AsĂ mismo, se observĂł que el frame score tuvo un efecto significativo (P < 0.0001) sobre el nĂşmero total de folĂculos a la PB. Se concluye que el efecto de la talla en animales prepĂşberes una caracterĂstica compleja, que estĂĄ asociada con los parĂĄmetros de composiciĂłn corporal y que afecta algunas de las caracterĂsticas de la dinĂĄmica folicular y que ademĂĄs vale la pena seguir estudiando en el ganado CebĂş.Em um perĂodo de 42 dias antes do inĂcio da puberdade (PB), os efeitos do tamanho (pequeno e grande porte) de novilhas Brahman prĂŠ-pĂşberes (BHM) sobre; idade, caracterĂsticas da dinâmica folicular e parâmetros de composição corporal. AlĂŠm disso, a pontuação do quadro (estrutura corporal) foi calculada como um estimador adicional de altura. BP foi definido como a primeira ovulação precedida pela observação do estro e seguida pela formação de um corpo lĂşteo de duração normal. Foram utilizadas 10 novilhas BHM. A alimentação foi individual com silagem de milho e concentrado comercial para obtenção de ganhos de peso semelhantes. Pesagens foram realizadas e a condição corporal (CC) foi medida a cada 14 dias. De acordo com o acompanhamento ultrassonogrĂĄfico das estruturas ovarianas, foi confirmada a ovulação e a formação do corpo lĂşteo (CL). Estatisticamente, uma anĂĄlise de correlação e anĂĄlise de variância foram realizadas com o procedimento GLM do SAS. Um efeito significativo do tamanho sobre o nĂşmero total de folĂculos no BP foi encontrado, onde novilhas de pequeno porte tiveram 16 folĂculos, enquanto as de grande porte tiveram 12 folĂculos no BP (P < 0,0001). O escore estrutural dos animais subdimensionados foi 10% maior do que o das novilhas superdimensionadas (P < 0,0001). Da mesma forma, observou-se que o frame score teve efeito significativo (P < 0,0001) sobre o nĂşmero total de folĂculos no PB. Conclui-se que o efeito da altura em animais prĂŠ-pĂşberes ĂŠ uma caracterĂstica complexa, que estĂĄ associada a parâmetros de composição corporal e que afeta algumas das caracterĂsticas da dinâmica folicular, e que tambĂŠm merece um estudo mais aprofundado em zebuĂnos
Endurecimiento por precipitaciĂłn en aleaciones al-4%cu-0.5%mg modificadas con ag
El estudio del endurecimiento por precipitaciĂłn en la aleaciĂłn Al-4%Cu- 0.5%Mg con adiciones de 0.5-4%Ag se realizĂł mediante microscopĂa electrĂłnica de transmisiĂłn (MET) y microdureza Vickers. Las aleaciones fueron homogeneizadas a 525°C durante 7 dĂas y templadas. Los tratamientos de precipitaciĂłn se realizaron a 150, 200 y 250°C por diferentes tiempos. La adiciĂłn de hasta 3%Ag promueve un aumento en dureza para todos los tratamientos de envejecido. Adicionalmente, los resultados muestran que la coexistencia de las fases θâ y Ί son las responsables de promover el aumento en dureza. Por otra parte, los anĂĄlisis de MET confirman que la fase Ί tiene una estructura fcc, es coherente con la matriz, y su morfologĂa es hexagonal con intercaras alineadas en las direcciones [311]Îą, [022]Îą y [111]Îą. Finalmente, la disminuciĂłn en la dureza de las aleaciones se atribuye a la desapariciĂłn de la fase θâ y al engrosamiento de la fase Ί
Home Garden as Socio-Environmental Sustainability Option
El artĂculo tiene como objetivo analizar la estrategia âhuertas caserasâ como opciĂłn de sostenibilidad socio-ambiental, tomando como referente contextual la expe-riencia de acciones solidarias de seguridad alimentaria con familias del Municipio de Tenza (BoyacĂĄ, Colombia). La metodologĂa se aborda desde tres fases: 1) DiagnĂłs-tica, orientada al reconocimiento de la comunidad inter-venida, a travĂŠs de una ficha de caracterizaciĂłn socioÂdemogrĂĄfica, ambiental y de seguridad alimentaria; 2) DiseĂąo de un plan estratĂŠgico con acciones solidarias para la atenciĂłn de las necesidades encontradas en el diagnĂłstico. 3) ImplementaciĂłn del plan propuesto en las comunidades objeto de estudio. Los resultados evidencian como el modelo de huerta casera y el aprovechamiento de residuos sĂłlidos orgĂĄnicos, resultan opciones estratĂŠgicas pertinentes para generar en la comunidad una iniciativa de reflexiĂłn sobre la seguridad alimentaria y la sosteni-bilidad socioambiental. Se concluye de esta forma como al contar con una mejor oferta alimenticia para la poblaciĂłn, se podrĂĄ garantizar una Ăłptima ingesta de nutrientes, mejorando los niveles de bienestar y estado de salud en sus habitantesThe objective of this article is to analyze the "home gardens" strategy as an option for socio-environmental sustainability, taking as a contextual reference the ex-perience of food security solidarity actions with fami-lies in the Municipality of Tenza (BoyacĂĄ, Colombia). The methodology is approached from three phases: 1) Diagnosis, oriented to the recognition of the intervened community, through a sociodemographic, environmen-tal and food security characterization file; 2) Design of a strategic plan with solidary actions for the attention of the needs found in the diagnosis. 3) Implementation of the proposed plan in the communities under study. The results show how the home-garden model and the use of solid organic waste are relevant strategic op-tions to generate in the community an initiative for reflection on food security and socioÂenvironmental sustainability. It is concluded in this way that by hav-ing a better food supply for the population, it will be possible to guarantee an optimal intake of nutrients, improving the levels of welfare and health status of its inhabitants
AnĂĄlisis arqueosismolĂłgico del conjunto arqueolĂłgico romano de Mulva- Munigua (Sevilla, EspaĂąa). Resultados preliminares
El conjunto arqueolĂłgico romano de Mulva-Munigua (Sevilla, EspaĂąa) presenta daĂąos en las edificaciones
que pueden ser interpretadas como resultado de la ocurrencia de un evento sĂsmico (Efectos ArqueolĂłgicos de los
Terremotos: EAEs) a finales del siglo III A.D., fecha coincidente con el inicio del periodo de declive econĂłmico de este
asentamiento romano. Para intentar establecer el posible origen sĂsmico de las deformaciones, se ha procedido al
inventario y anĂĄlisis de las estructuras deformadas presentes en el yacimiento. No obstante, algunas de estas
deformaciones tambiĂŠn se pueden interpretar como resultado de procesos gravitaciones asociados a la ladera Este de la
colina sobre la que se sitĂşa parte del yacimiento. Las direcciones de mĂĄxima deformaciĂłn (ey) obtenidas del anĂĄlisis de
EAEs indica dos direcciones preferentes de la deformaciĂłn (o movimiento preferente del terreno): NNO-SSE y ENEOSO.
Aunque los datos presentan una dispersiĂłn importante, se puede establecer que la orientaciĂłn principal NNO-SSE
es compatible con un evento sĂsmico situado en el borde norte del Valle del Guadalquivir. La orientaciĂłn ENE-OSO
podrĂa relacionarse con un evento posterior, o mĂĄs seguramente con procesos de ladera de carĂĄcter cosĂsmico o no.The Roman archaeological site of Mulva-Munigua (Sevilla, Spain) displays building damage features
suggesting a seismic origin (Earthquake Archaeological Effects: EAEs). The proposed seismic event could be
tentatively dated in the late 3rd century AD, coinciding with the beginning of the economic fall of the Roman Empire at
Iberia. However, some of the recorded EAEs can be also interpreted as a result of intervening slope movements in the
eastern hillslope of this roman site. The inventory and analysis of the proposed EAEs make possible to discern between
seismic oriented damage and other causes. In spite of the data show a significant dispersion, their analysis result in two
different orientations of maximum deformation (ey) or preferential ground movement: NNW-SSE and ENE-WSW. The
main ey orientation (NNW-SSE) can be tentatively related to a seismic event occurred in the environs of the northern
border of the Guadalquivir Depression. The secondary orientation (ENE-WSW) can be interpreted as a consequence of
latter slope movements triggered (or not) by other ancient earthquakes
Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV
The performance of muon reconstruction, identification, and triggering in CMS
has been studied using 40 inverse picobarns of data collected in pp collisions
at sqrt(s) = 7 TeV at the LHC in 2010. A few benchmark sets of selection
criteria covering a wide range of physics analysis needs have been examined.
For all considered selections, the efficiency to reconstruct and identify a
muon with a transverse momentum pT larger than a few GeV is above 95% over the
whole region of pseudorapidity covered by the CMS muon system, abs(eta) < 2.4,
while the probability to misidentify a hadron as a muon is well below 1%. The
efficiency to trigger on single muons with pT above a few GeV is higher than
90% over the full eta range, and typically substantially better. The overall
momentum scale is measured to a precision of 0.2% with muons from Z decays. The
transverse momentum resolution varies from 1% to 6% depending on pseudorapidity
for muons with pT below 100 GeV and, using cosmic rays, it is shown to be
better than 10% in the central region up to pT = 1 TeV. Observed distributions
of all quantities are well reproduced by the Monte Carlo simulation.Comment: Replaced with published version. Added journal reference and DO
Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV
The performance of muon reconstruction, identification, and triggering in CMS
has been studied using 40 inverse picobarns of data collected in pp collisions
at sqrt(s) = 7 TeV at the LHC in 2010. A few benchmark sets of selection
criteria covering a wide range of physics analysis needs have been examined.
For all considered selections, the efficiency to reconstruct and identify a
muon with a transverse momentum pT larger than a few GeV is above 95% over the
whole region of pseudorapidity covered by the CMS muon system, abs(eta) < 2.4,
while the probability to misidentify a hadron as a muon is well below 1%. The
efficiency to trigger on single muons with pT above a few GeV is higher than
90% over the full eta range, and typically substantially better. The overall
momentum scale is measured to a precision of 0.2% with muons from Z decays. The
transverse momentum resolution varies from 1% to 6% depending on pseudorapidity
for muons with pT below 100 GeV and, using cosmic rays, it is shown to be
better than 10% in the central region up to pT = 1 TeV. Observed distributions
of all quantities are well reproduced by the Monte Carlo simulation.Comment: Replaced with published version. Added journal reference and DO
Azimuthal anisotropy of charged particles at high transverse momenta in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
The azimuthal anisotropy of charged particles in PbPb collisions at
nucleon-nucleon center-of-mass energy of 2.76 TeV is measured with the CMS
detector at the LHC over an extended transverse momentum (pt) range up to
approximately 60 GeV. The data cover both the low-pt region associated with
hydrodynamic flow phenomena and the high-pt region where the anisotropies may
reflect the path-length dependence of parton energy loss in the created medium.
The anisotropy parameter (v2) of the particles is extracted by correlating
charged tracks with respect to the event-plane reconstructed by using the
energy deposited in forward-angle calorimeters. For the six bins of collision
centrality studied, spanning the range of 0-60% most-central events, the
observed v2 values are found to first increase with pt, reaching a maximum
around pt = 3 GeV, and then to gradually decrease to almost zero, with the
decline persisting up to at least pt = 40 GeV over the full centrality range
measured.Comment: Replaced with published version. Added journal reference and DO
Search for a W' boson decaying to a bottom quark and a top quark in pp collisions at sqrt(s) = 7 TeV
Results are presented from a search for a W' boson using a dataset
corresponding to 5.0 inverse femtobarns of integrated luminosity collected
during 2011 by the CMS experiment at the LHC in pp collisions at sqrt(s)=7 TeV.
The W' boson is modeled as a heavy W boson, but different scenarios for the
couplings to fermions are considered, involving both left-handed and
right-handed chiral projections of the fermions, as well as an arbitrary
mixture of the two. The search is performed in the decay channel W' to t b,
leading to a final state signature with a single lepton (e, mu), missing
transverse energy, and jets, at least one of which is tagged as a b-jet. A W'
boson that couples to fermions with the same coupling constant as the W, but to
the right-handed rather than left-handed chiral projections, is excluded for
masses below 1.85 TeV at the 95% confidence level. For the first time using LHC
data, constraints on the W' gauge coupling for a set of left- and right-handed
coupling combinations have been placed. These results represent a significant
improvement over previously published limits.Comment: Submitted to Physics Letters B. Replaced with version publishe
Search for the standard model Higgs boson in the H to ZZ to 2l 2nu channel in pp collisions at sqrt(s) = 7 TeV
A search for the standard model Higgs boson in the H to ZZ to 2l 2nu decay
channel, where l = e or mu, in pp collisions at a center-of-mass energy of 7
TeV is presented. The data were collected at the LHC, with the CMS detector,
and correspond to an integrated luminosity of 4.6 inverse femtobarns. No
significant excess is observed above the background expectation, and upper
limits are set on the Higgs boson production cross section. The presence of the
standard model Higgs boson with a mass in the 270-440 GeV range is excluded at
95% confidence level.Comment: Submitted to JHE
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