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1.
Arnaldo Belluigi 《Pure and Applied Geophysics》1960,45(1):65-96
Riassunto Viene qui enunciato un effetto d'elettroplasticità nelle sue essenziali consistenze qualitativa e quantitativa, con esemplificazioni. L'A. mostra inoltre come quest'effetto possa essere rimosso o meno, introducendo idonei dispositivi elettrici e adeguate manovre geocircuitali. Alla nota prassi dell'elettrodrenaggio si viene con ciò ad aggiungere quella dell'elettroridistribuzione dell'acqua tellurica d'impregnazione, con finalità opposte nei due casi, di rassodamento e di plastizzazione.
Summary This paper states an electro-plastic effect taking into account by means of examplification its qualitative and quantitative essential characteristics. Furthermore it is shown how this effect by means of adapt electrical devices and adequate manoeuvring of the geo-circuits may be increased or decreased. Therefore to the well known electro-dewatering praxis is added that of electro-distribution of permeating groundwater, with opposite ends in the two cases, i.e.: in order to consolidate or render plastic the soil.相似文献
2.
Prof. Arnaldo Belluigi 《Pure and Applied Geophysics》1958,39(1):65-71
Riassunto Cfr. Geofisica pura e applicata, Vol. 37, 1957, p. 90–102. 相似文献
3.
旋转扰动流体中壁面湍流不稳定及其拟序结构研究Ⅱ：数值模式 总被引：1，自引：1，他引：0
对第一部分的实验结果进行了讨论,指出局地最大、最小涡度的存在与所谓的正压不稳定和大气中经常观测到的滚动涡有关。速度廓线中的拐点和涡度极大值点对应不稳定发展的位置。另外,为了改进湍流的模拟,根据“准正则”近似,发展了一个三阶闭合模式。这个模型已被证明可以描述与湍流过程有关的流体动力学变量的趋势。 相似文献
4.
Claudio Cassardo ;Nicola Loglisci ;Min Wei Qian ;Silvia Ferrarese ;Arnaldo Longhetto ;Gianpaolo Balsamo 《气象与减灾研究》2008,31(2):6-13
对1999年圣诞期间发生在欧洲中西部的圣诞节风暴进行了分析,认为4个主要的低气压系统中的第二个给法国北部带来了强风暴雨,巴黎的Orly机场阵风速度〉47m／s;第四个低压系统沿法国西海岸产生相似的恶劣天气,并在西班牙的北部海岸及地中海沿岸国家造成了毁灭性的破坏。在法国中部风暴最剧烈的时候,最大阵风〉41m／s;在法国和德国之间的区域,达55m／s。圣诞节风暴造成欧洲国家大约140人死亡,其他损失包括树木、街道和房屋被毁,电力系统和电话中断时间长达数天,受影响的人数大约为1000万,财产损失大约为80亿美元。由于风暴的极端强度和快速发展速度,欧洲大多数国家的数值预报中心没有对这次剧烈天气提供足够的预警。为此,利用中尺度数值预报系统（RAMS）模拟圣诞节风暴,并与ECMWF分析资料以及实况观测资料进行了对比分析。结果表明,RAMS模式能够准确模拟风暴的主要特性、低气压的演变和位置移动、发展的关键时间点、风暴演化期间的平均风场;模拟的平均风场和气象观测网的观测结果相一致;模拟的风暴移动时间和主要新闻媒体的报道相吻合;模式计算的一些特定地区平均风速的时间趋势显示,在阿尔卑斯山脉地区,无论是上风区还是下风区,风暴的时间都被准确地预测;模拟的第一次风暴最低气压值较实际值偏低。 相似文献
5.
Arnaldo Belluigi 《Pure and Applied Geophysics》1962,51(1):120-141
Riassunto L'A. ha qui escogitato una equivalenza bisol-monosol, realizzabile sul terreno, per instaurare «elettrodiaframmi», «elettroparatie» a qualsiasi distanza dagli iniettori di legante. Ne studia gli aspetti fenomenologici principali, corredandoli di grafici utili all'impiego del metodo.
Summary This paper deals with the devising of an equivalence bisol-monosol, which can be performed into soil, in order to carry into effect «electro-diaphragm» and «electro-pilings» at any distance from binding-solution electro-injectors. Principal aspects of phenomena are studied, and graphs useful for applyng the method are given.相似文献
6.
Effects of mining wastes on a seagrass ecosystem: metal accumulation and bioavailability, seagrass dynamics and associated community structure 总被引：1，自引：0，他引：1
Marín-Guirao L Atucha AM Barba JL López EM Fernández AJ 《Marine environmental research》2005,60(3):317-337
Two different Cymodocea nodosa (Ucria) Ascherson beds growing in mining-contaminated sediments were compared with two reference beds in the Mar Menor coastal lagoon. The accumulation of Zn, Pb and Cd in different fractions of the plant, the sediment parameters that regulate the availability of metals, the seabed structure and dynamics of each seagrass bed and its associated macroinvertebrate community were studied. C. nodosa accumulates metals from the sediments and reflects their bioavailability for this seagrass. At each station, the metal content of the rhizomes was lower than that of leaves and roots. The concentration of acid-volatile sulfides does not seem to influence the availability of metals to the seagrass, possibly due to oxygen transport to underground tissues. The highest metal concentration in all the contaminated stations was found in the leaf-biofilm, due to the formation of complexes between metals and the extracellular polymeric substances that form the biofilm. All the seagrass beds were seen to be undergoing expansion, those growing in contaminated sediments accumulating great quantities of metals and showing highest photosynthetic leaf surface area and highest leaf biomass. However, these structural parameters were not seen to be responsible for the differences in the faunal composition observed between contaminated and reference beds. Moreover, the multivariate analysis identified the metal content of leaves, biofilm and sediments as important variables that may be responsible for these differences in faunal composition. In this study we have demonstrated that both the seagrass C. nodosa and the biofilm on the plant leaves may be used as environmental tools in the Mar Menor lagoon. The former is an useful indicator of sediment contamination, whereas the latter seems to be a good sentinel of water quality. 相似文献
7.
José R.M. de Sousa Carlos Magluta Ney Roitman Gilberto B. Ellwanger Edison C.P. Lima Arnaldo Papaleo 《Applied Ocean Research》2009,31(3):157-170
Even though hydraulic collars are largely used to install flexible risers, neither the loads imposed by this equipment nor the response of the risers to these loads have been previously studied. Hence, this paper presents a three-dimensional nonlinear finite element (FE) model to predict the response of flexible risers to loads imposed by hydraulic collars and also provides a set of equations to predict these loads. The FE model relies on an analogy between helical tendons and orthotropic shells to simulate the inner carcass and the pressure armour of flexible risers. Shell elements are used to represent the polymeric layers and three-dimensional beam elements simulate the wires of the tensile armours. Material, geometric and contact nonlinearities are addressed. Contact interactions between the layers of the riser are handled by surface to surface contact elements with a contact detection algorithm based on the pinball technique and contact forces evaluated with the augmented Lagrangian method. A 9.5″ flexible riser is analyzed and the numerical results are compared to those from the experimental tests. The agreement between all results indicates that the proposed FE model is an efficient approach to predict the response of flexible risers to loads imposed by hydraulic collars and, moreover, may be used to analyze the response of such structures to other types of loads. 相似文献
8.
Arnaldo Belluigi 《Pure and Applied Geophysics》1958,41(1):107-124
Riassunto Dalle correlazioni da noi evidenziate tra portate elettrogeosmotiche e pressioni geoidrostatiche si passa alle norme della regolazione dell'elettroprocesso. Correlazioniamo inoltre le portate idriche con le correnti e tensioni applicate nonchè con le correnti e tensioni critiche o di soglia. Si analizza a fondo il rendimento elettrogeosmotico, calcolando il massimo, il minimo, quelli parziali o polari. Si deduce un principio di mescolamento elettrodico e altre prassi d'interesse applicativo.
Summary After having brought into evidence the relationships between electrogeo-osmotic flow and geo-hydrostatic pressure, the A. shows the regulation rules of electro-process. Besides, the A. relates hydraulic flows to currents and tensions, as well as to critical, or threshold currents and tensions. The A. analyses to the narrow electro-osmotic efficiency, by calculating the highest and lowest efficiences, and the partial or polar ones. It can be derived a multi-electrode pattern, and several other application processes.相似文献
9.
Modelling techniques for dynamic inelastic response analysis of coupled wall structures are investigated. Emphasis is placed on effects of parameters defining the force-displacement hysteresis loop. Specifically, effects of axial force-moment interaction, strength reduction, shear yielding, pinching, reloading and unloading branches of hysteresis loops are considered. Effects of modelling parameters on selected response quantities are investigated and discussed in detail. A 20-storey coupled wall structure was selected for dynamic analysis. Ranges of parameters characterizing force-displacement hysteresis loops were obtained from laboratory tests under slowly reversed static loading. Previously recorded strong motion accelerograms were used as input motions. Results indicate that wall axial forces and beam strength reduction can have significant effects on response envelopes. Moderate variations in unloading and reloading branches of hysteresis loops and pinching appear to have little effect on dynamic response. 相似文献
10.
Prof. Dr. Arnaldo Belluigi 《Pure and Applied Geophysics》1957,37(1):90-102
Riassunto Si pongono le equazioni fondamentali della elettrosmosi tridimensionale. Quindi si danno le soluzioni generali in termini capacitivi e in termini resistivi, con relativa discussione. Si chiude questa prima Parte con un cenno sulla economia dell'impianto elettrogeosmotico.
Relazione presentata il 23 Aprile 1957 alla Quinta Assemblea Generale della Società Italiana di Geofisica e Meteorologia (Genova, 23–25 April 1957). 相似文献
Summary There are layed down the fundamental equations of the tridimensional electrosmosis. Then there are given the general solutions in capacitive terms and in resistive terms with relating discussion. This first part of the work is concluded referring to economy of the electrosmotic plant.
Zusammenfassung Es werden die Grundgleichungen der dreidimensionalen Elektrosmose aufgestellt. Daraufhin werden die allgemeinen Lösungen in Form von Kapazitätsgrössen und in Form von Widerstandsgrössen aufgestellt und besprochen. Dieser erste Teil der Arbeit wird mit einem Hinweis auf die Wirtschaftlichkeit der elektrosmotischen Anlage abgeschlossen.
Relazione presentata il 23 Aprile 1957 alla Quinta Assemblea Generale della Società Italiana di Geofisica e Meteorologia (Genova, 23–25 April 1957). 相似文献