58 research outputs found
Geomechanics and Geotechnical Engineering Problems in the Design and Construction of Underground Buildings
No full textThis Reprint aims to showcase the recent advances in research related to geomechanics and geotechnical engineering problems in the design and construction of underground buildings and present some scientific issues and solutions encountered in tunnel engineering, foundation pit engineering, subway construction and other projects. As the geotechnical problems of underground engineering remain persistent throughout the entire process and are relevant to environmental protection, it is essential to consider the mechanical characteristics of geotechnical engineering and its interaction with structure when solving related engineering problems such as underground building structures. The contributions of this collection explore issues in geotechnical engineering related to different types of building structures. The topics include the seismic response of induced joints in subway stations; the shock absorption and energy dissipation effects of improved foundations, the stability, support effects, and seismic response laws of tunnels in different rock and soil masses; the stability and support methods of deep foundation pits in different environments; and the mechanical characteristics of different types of rock and soil foundations, etc. This Reprint provides valuable resources for researchers and practitioners for the design and construction of underground building structures
Zheng jiao de cheng shen jiao yi yu Bate shen xue: Orthodox doctrine of deification and Barth's theology.
No full text由於歷史和神學的複雜原因，自二十世紀後半葉至今的數十年時間里，正教神學經歷了一場十分可觀的復興，使得正教神學在國際學術界得到廣泛重視和熱烈的討論，其中尤為引人注目的是一嚮被視作正教特有的古老教義──成神論。它一經現代學者關注，便迅速發展成為普世教會對話的重要論題，為更多來自西方基督教傳統的神學家所研究。而現時，關於成神論的一個研究熱點就是發掘西方傳統中重要神學家思想中的成神論因素，或是探討其思想與成神論的關係。本研究關注的正是巴特（Karl Barth, 1886-1968）與成神論的關係。現有對於巴特神學與成神論進行比較研究的文獻數量極少，而且存在著一個重要問題，即沒有能夠展現一個在規模上和深度上相當的成神論綜述，作為與巴特神學進行比較的參照。為解決這一問題本文選擇了洛斯基（VladimirLossky, 1903-1958）、茲茲奧拉斯（John Zizioulas）與斯塔尼萊（Dumitru Stăniloae,1903-1993）三位現代正教神學大家為代表，通過他們三人的神學來展現正教成神論的一個較為全面的風貌。在這三位神學家中，洛斯基的神學主要繼承了聖帕拉瑪（St. Palamas,1296-1359）的思想，著力闡發上帝的神聖能力與神聖本質相區分的傳統教義，以此為進路通嚮成神論；茲茲奧拉斯則是以卡帕多西亞教父的論述的"位格"概念為核心，逐漸擺脫了神聖能力與神聖本質相區分的既定格局，發展出一種通過人與上帝的位格相遇而實現的成神論；斯塔尼萊作為一位集大成的正教神學家，在其巨著《正教教義神學》中系統展現了正教神學的全貌，說明了以人論、基督論、拯救論為主要支點的成神論，其實是正教教義神學的終極歸宿和總目標。在考察過三位正教神學家的成神論思想后，轉入巴特的神學。針對與成神論關係密切相關的論題，著重考察巴特的基督論、人論，以及基於這二者的救贖論，並與東正教相對應問題的比較。通過比較最終發現，雖然兩者間在某些論題確實存在著難以抹殺的分歧，但巴特神學以基督論為基礎建構起的人論則與東正教傳統有著顯著的親和力，尤其在對罪觀的闡述上，已然突破了東西傳統之間的壁壘，形成了具有普世意義的教義理論，說明巴特的拯救觀已然超出了傳統西方的救贖論模式，與正教成神論有趨同之勢。最後，在對整個研究做出總結的基礎上，闡明本研究的內在動機和現實意義，即進一步推進漢語學界對東正教神學的了解和認識，進而改善因了解的片面性造成的、在漢語學界仍然存在的對基督宗教的成見。並通過說明東正教神學思想與中國傳統思想的親和性，展現東正教神學研究對於建構漢語神學的積極意義。Due to both historical and theological reasons, the Orthodox theological tradition underwent a significant revival during the past several decades. Some themes in the Orthodox tradition drew the attention of international academia. Among them, the ancient doctrine of deification is unquestionable the most attractive one, which quickly became an important topic in the ecumenical dialogue. Nowadays, one of the hot issues concerning the study of deification is the comparison between the Orthodox and Western understandings of theosis or deification. In this thesis, the relation between Karl Barth(1886-1968)'s theology and the Orthodox doctrine of deification will be explored.There are only a small number of existing studies dedicated to the comparison between Barth and the Orthodox doctrine of deification, and they focused rather exclusively on Christology. In order to give a comprehensive and extensive comparison between Barth and the Orthodox doctrine of deification, this thesis choose three masters of modern Orthodox theology as the reference points for comparison, and they are V. Lossky(1903-1958), John Zizioulas, and D.Stăniloae(1903-1993).Following St. Palamas(1296-1359), Lossky based his theology of deification on the distinction between divine energy and essence. Zizioulas inherited Cappadocian Fathers' thought, and explained deification in terms of personal encounter. Staniloae articulated a comprehensive Orthodox dogmatic theology with deification as the centre or key of the whole system, and took theological anthropology, Christology, and Soteriology as the three pillars of the doctrine of deification.After exploring these three orthodox theologians' thought, the discussion will turn to Barth’s theology, especially his Christology, anthropology, and doctrine of salvation. We will find that Barth’s theological anthropology, which is oriented by his Christology, shows certain similarities to the anthropology in Eastern Orthodox theology, and they share similar understanding of unio hypostatica and communicatio idiomatum. Furthermore, Barth’s understanding of sin together with salvation is not only quite far away from the hamartiology prevalent in western theological tradition, which is focused on original sin and its redemption, but also comes closer to the Orthodox theological tradition. Though there are undeniable differences between Barth and Orthodox theology, there are also significant affinities between them on the issue of deification.To the end of this study, this thesis will discuss the significance of the studies of Orthodox theology for the Chinese academica. It is foreseeable that a careful study of Orthodox theology will clear some of the misunderstandings of or even biases against Christianity prevalent in the Chinese-speaking world. Meanwhile, the studies of Orthodox theology can also contribute a lot to the construction of Sino-Christian Theology due to the similarities between Orthodox theology and traditional Chinese religious-philosophical thought.Detailed summary in vernacular field only.Detailed summary in vernacular field only.Detailed summary in vernacular field only.Detailed summary in vernacular field only.Detailed summary in vernacular field only.張少博.Parallel title from added title page.Thesis (Ph.D.) Chinese University of Hong Kong, 2015.Includes bibliographical references (leaves 131-137).Abstracts also in English.Zhang Shaobo
Numerical Simulation of Impact Effect on Stability of Transmission Tower Foundation
No full textThe impact effect can cause structural damage to a transmission tower’s foundation and affect its overall stability. In order to study the influence of the impact effect on the stability of transmission tower foundations, a three-dimensional finite element numerical simulation method was used to investigate the variations in the extent of damage, displacement, and inclination degree of a transmission tower foundation under different impact velocities, impact durations, impactor shapes, and impact locations. The results show that as the impact velocity increases, the damage value of the transmission tower foundation continuously increases, and the damaged area expands. The lateral displacement value increases continuously with the duration of the impact effect, and the variation in lateral displacement follows a linear function distribution. The inclination degree of the transmission tower foundation increases continuously with increased impact duration and can lead to overturning failure. A smaller impact contact area results in a larger compressive damage value for the transmission tower foundation, and different impact contact areas lead to different modes of failure for the transmission tower foundation. The damage value and damaged area of the transmission tower foundation vary with the location of the impact. By comparing the deformation of the transmission tower foundation before and after reinforcement, it is evident that the reinforcement design can significantly improve the deformation resistance and anti-overturning capacity of the transmission tower foundation
Orbital shadowing for 3-flows
No full textWe call that a flow has the orbital shadowing property if for any 8 > 0 there is d > 0 such that, for any d-pseudo orbit g (t) there exists an orbit Orb(x) satisfying dist(H)<(g(t))over bar> <(Orb(x)))over bar> < epsilon. In this paper, we show that the C-1-interior of the set of 3-dimensional flows having the orbital shadowing property is contained in the set of S2-stable 3-flows. (C) 2017 Elsevier Inc. All rights reserved.973 project [2011CB808002]; NSFC [11025101, 11231001, 11201244, 11571188]; SRFDP [20120031120024]SCI(E)ARTICLE105022-505126
Generation of Sub-900-μJ Supercontinuum With a Two-Octave Bandwidth Based on Induced Phase Modulation in Argon-Filled Hollow Fiber
No full textWe succeeded in generating 860-μJ pulses spanning the range from 270 to 1000 nm, the highest energy two-octave pulses demonstrated to date, by utilizing not only self-phase modulation but also induced phase modulation based on nonlinear co-propagation of fundamental and second-harmonic femtosecond pulses in a pressure gradient Ar-gas-filled hollow fiber. This corresponds to 1.5-fs, 0.3-TW, 0.65-cycle transform-limited pulses at a 1-kHz repetition rate, which serves as an optical source for ultrafast ultrabroadband spectroscopy and quantum control as well as attosecond science and technology
Numerical Study of Ground Vibrations Caused by Cylindrical Wave Propagation in a Rock Mass with a Structural Plane
No full textStress wave which is caused either by an explosion in a borehole or by an accidental explosion in a tunnel is supposed to be considered under certain circumstances when it propagates through the surrounding rock masses which contain holes in cylindrical form. Studying the ground motion induced by the cylindrical wave propagation is of practical significance for underground rock engineering and underground energy exploitation. The current study presents a numerical study on the ground motion caused by cylindrical P-wave propagation across a rock mass with a structural plane using a discrete element numerical method, UDEC. Firstly, the accuracy and validity of the cylindrical wave propagation simulation in UDEC and of the induced ground vibration are confirmed by comparison with the theoretical results for a special case that there is no structural plane in a rock mass. Secondly, cylindrical wave propagation across a rock mass with a structural plane is simulated, and then, the particle velocity on the ground surface is subsequently obtained. Finally, parametric researches are carried out on the influence of the monitoring point’s position, the structural plane stiffness, and the frequency of incident wave on the peak particle velocities (PPVs) of the ground vibrations
Settlement Prediction of High Fill Subgrade in Loess Areas Based on Variational Mode Decomposition and Particle Swarm Optimization of Long Short-Term Memory Networks
No full text[Purposes] This research is conducted to achieve accurate prediction of settlement trends for high fill subgrades in loess areas. [Methods] In this work, a Variational Mode Decomposition (VMD) and Particle Swarm Optimization (PSO) optimized Long Short-Term Memory (LSTM) network prediction model was proposed, referred to as VMD-PSO-LSTM model. This model was designed to learn high-level features of the settlement data for high fill subgrade and predict their developmental trends. To validate the effectiveness of the proposed model, an engineering case study was conducted. [Results] The results clearly indicate that the VMD-PSO-LSTM model performs well in predicting the settlement curves of high fill subgrade. Moreover, its accuracy surpasses that of the Back Propagation Neural Network (BP) model, the standard LSTM model, and the LSTM model optimized solely by PSO (PSO-LSTM), suggestings that the proposed VMD-PSO-LSTM model not only provides enhanced predictive accuracy but also demonstrates increased robustness and wider applicability
The Star Systems X* and a Proof of the C1Ω-stability Conjecture for Flows
No full textAbstractIn this paper we give a new proof for the C1Ω-stability conjecture for flows. Our approach is considerably different from that of Hayashi or Wen, and a good deal of Liao's obstruction sets theory is used
Reelin Signaling Inactivates Cofilin to Stabilize the Cytoskeleton of Migrating Cortical Neurons
No full textNeurons are highly polarized cells. They give rise to several dendrites but only one axon. In addition, many neurons show a preferred orientation. For example, pyramidal neurons of the cerebral cortex extend their apical dendrites toward the cortical surface while their axons run in opposite direction toward the white matter. This characteristic orientation reflects the migratory trajectory of a pyramidal cell during cortical development: the leading process (the future apical dendrite) extends toward the marginal zone (MZ) and the trailing process (the future axon) toward the intermediate zone (IZ) while the cells migrate radially to reach their destination in the cortical plate (CP). In this review article, we summarize the function of Reelin, an extracellular matrix protein synthesized by Cajal-Retzius cells in the MZ, in the development of the characteristic orientation of the leading processes running perpendicular to the cortical surface. Reelin promotes migration toward the cortical surface since late-generated cortical neurons in the reeler mutant are unable to reach upper cortical layers. Likewise, Reelin is important for the orientation and maintenance of the leading processes of migrating neurons since they are misoriented in the developing reeler cortex, as are the apical dendrites of pyramidal cells in the mature mutant. Reelin-induced phosphorylation of cofilin, an actin-associated protein, is crucial since pyramidal neurons transfected by in utero electroporation (IUE) with a non-phosphorylatable form of cofilin (cofilinS3A) show severe migration defects reminiscent of those in the reeler mutant. Remarkably, migration of neurons in the cortex of reeler mice was partially rescued by transfecting them with LIM kinase 1 (LIMK1), the kinase that induces phosphorylation of cofilin at serine3, or with a pseudo-phosphorylated cofilin mutant (cofilinS3E). Together these results indicate that Reelin-induced phosphorylation of cofilin is an important component in the orientation and directed migration of cortical neurons and in their correct lamination
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