5,738 research outputs found
Математическое моделирование в прогнозировании валового регионального продукта с помощью HM-сетей
No full textDunets A. Yu. Mathematical modeling in forecasting gross regional product using HM network
Oxygen isotope and trace element compositions of peridotite xenolitlis from Nushan volcano, SE China and implications for mantle metasomatism
No full textOxygen isotopic compositions and trace element contents of minerals from 9 peridotite xenoliths hosted by Cenozoic basalts\ in Nushan, SE China have been obtained by laser fluorination method and LA-ICP-MS respectively. Some samples dont show oxygen isotope equilibrium between pyroxene and olivine with the lowest Delta(Cpx)(18)O ( = delta(18)O(Cpx)-delta(18)O(OI)) of -0.5 parts per thousand. Clinopyroxenes from the amphibole-bearing xenoliths are enriched in LILE (Sr, Th, LREE) and depleted in HFSE (Nb, Zr, Ti). Oxygen isotope data suggest that the Nushan upper mantle experienced metasomatism by oceanic fluids from the subducted plate. Based on the negative correlation between Delta(Cpx-01)(18)O and formation depth of Nushan xenoliths, we propose an "ascending + buffering" model for mantle metasomatism in Nushan. The degree of oxygen isotopic disequilibrium is not related with LILE enrichment and HFSE depletion, suggesting at least two metasomatic events happened in the Nushan mantle, one was responsible to LILE enrichment/HFSE depletion and another to oxygen isotopic disequilibrium
Traffic-related air pollution, climate, and prevalence of eczema in Taiwanese schoolchildren.
No full text[[alternative]]Population dynamics of Faunis eumeus Drury
No full text[[abstract]]An exotic butterfly in Keelung, Faunis eumeus, was studied for its distribution and population dynamics. The study was progressed between July, 2000 and April, 2002. Twelve study areas were set up and two of them, HM and HY, were selected for counting population size of adults and tracing survival rate of eggs or larvae.
In the study, the distribution of F. eumeus was stable but the population size in HM and HY was not stable, namely, the population size in HM decline straightly and in HY the population size first increased but later decline as soon as HM in 2001. However, the population size in HM and HY increase in the 2002’s spring. The dispersal of F. eumeus was not obvious but did happen in the marginal areas, such as SD and PK. The reason that made the population size decline obviously was one species of small wasps that lay eggs in the eggs of F. eumeus and causing hosts death. The insufficient source of food plants was also one reason that causing larvae death but not the main cause that decreased the population size. One new host plant was recorded, Calculigo capitulat. However, the female laid eggs whether on C. capitulata or not seemed to depend on population size of F. eumeus. The female preferred the initial host plant, Heterosmilax japonica and the larvae ate it had higher survival rate and higher emerging rate than those ate C. capitulata.
Descriptions of the larvae of Huosoma Guan, Dumont, Yu, Han & Vierstraete 2013 from China (Odonata: Coenagrionidae)
No full textYang, Guo-Hui, Orr, Albert G., Zhang, Hao-Miao (2022): Descriptions of the larvae of Huosoma Guan, Dumont, Yu, Han & Vierstraete 2013 from China (Odonata: Coenagrionidae). Zootaxa 5134 (3): 426-434, DOI: https://doi.org/10.11646/zootaxa.5134.3.
An assessment of the impact of possible CAP reform scenarios on Romanian agriculture
No full textUsing a simplified model, with key-variable the prices of two different possible scenarios of CAP reform after 2013 (moderate and radical), this paper present a comparison between the price effects of implementation of each reform scenario at 2015 horizon on Romanian agriculture. This short analysis shows that, under the presented hypotheses, the net welfare effect, due to the price changes, for the selected products, is positive in both reform scenarios, yet greater in the case of the radical reform. Integrated in the large context of Romanian development, it seems that the influence of CAP reform upon agriculture and rural areas will be most likely a gradual one: an interpenetration between the two scenarios is foreseeable, starting with the moderate reform that will dominate the period around 2013, the reform measures acquiring a more radical character afterwards.CAP reform, Romania, welfare effects, Agricultural and Food Policy,
Aeroacoustic investigation of active base blowing applied to a structured porous cylinder
No full textThe influence of local blowing (LB) through a structured porous-coated cylinder (SPCC) as a hybrid method (HM) for vortex-induced noise suppression of a circular cylinder was investigated experimentally. The air blowing was applied at the base of the cylinder from the front stagnation point (���� = 180○) over a long span length (seven times the outer diameter of the cylinder). To better understand the underlying noise reduction mechanism of HM compared to the other methods tested here (i.e., SPCC and LB without SPCC at ���� = 180○), near-field pressure was synchronised with far-field noise measurements. In addition, planar particle image velocimetry measurements were carried out to visualise the flow field and wake development back of the cylinder under the influence of different methods. The results showed that HM causes a significant reduction in the tonal and broadband noises produced by the baseline, specifically relative to LB at ���� = 180○, yet the HM performance was very similar to that of the SPCC. The coherence between near- and far-field pressure demonstrated that the surface pressure fluctuations imposed at the shoulders of the cylinder (approximately in the pre- and post-separation regions) at the fundamental vortex shedding frequency have the most contribution to the tonal noise produced by the baseline. It was observed that SPCC and HM suppress vertical velocity fluctuations close to the cylinder significantly with a very similar delay in rolling up the shear layers into vortex structures and pushing the recirculation bubbles further downstream in comparison to the baseline and LB at ���� = 180○. In these cases, the energy content of surface pressure fluctuations is reduced as a result of vertical flow movement during vortex shedding, and the acoustic pressure field cannot propagate as sound waves to the far-field
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