Influence of erosional unloading on the state of stress for low amplitude single-layer buckle folds - implications for tensile fracture occurrence

The existence of fractures associated to buckle folds is related to the strain distribution of the fold. The erosional unloading process can amplify the remnant strain in the folded layer. Two-dimensional plane strain Finite Element Analysis (FEA) is used to investigate the influence of the erosional unloading step on both the evolution of the state of stress and the associated failure patterns in low amplitude buckle folds. Sensitivity analyses on different input parameters, including viscosity, shortening ratio, and overburden pressure, are performed. Based on the simulation results, tensile stress can be initiated both in the crest and in the limb of low amplitude buckle folds in high permeability models during the elastic erosional unloading process. Tensile failure can be initiated perpendicular to the bedding in the top of the fold crest. The type of fracture in the limb depends on the strength of the rock. Tensile failure is initiated in the fold limb more likely for strong rocks while shear failure is initiated more likely for weak rocks. The orientation of both the stresses and the subsequent fractures in low amplitude folds is not affected by the erosional unloading process. In summary, the initiation of both the tensile stress and the subsequent fractures depends on rock properties and strain history --Abstract, page iii

Seismic loss assessment of typical RC frame-core tube tall buildings in China and US using the FEMA P-58 procedure

Reinforced concrete (RC) frame-core tube buildings are widely constructed both in China and the United States (US). Their seismic performances greatly influence the economic loss of earthquakes. This study aims to compare the seismic losses of two typical RC frame-core tube tall buildings designed following the Chinese and the US seismic design codes. The prototype building is originally designed using the US seismic design codes, provided by the Tall Building Initiative (TBI) Project. Then the prototype building is redesigned according to the Chinese seismic design codes with the same design conditions and seismic hazard level. Detailed nonlinear finite element (FE) models are established for both designs. These models are used to evaluate their seismic responses at different earthquake intensities, including the service level earthquake (SLE), the design based earthquake (DBE) and the maximum considered earthquake (MCE). In addition, the collapse fragility functions of these two buildings are established using the incremental dynamic analysis (IDA). Subsequently, the seismic loss consequences (repair costs, repair workload, and casualties) of these two designs are calculated using the procedure proposed by FEMA P-58. The comparison shows that the Chinese design exhibits better seismic performances in most cases with smaller total repair cost, shorter repair time and a smaller number of casualties, except slightly longer repair time at the MCE level. For both designs, the repair cost of nonstructural components accounts for the majority of the total cost. The ceilings and elevators are the major causes of casualties at the MCE level

Performance Analysis of Sparse Traffic Grooming in WDM Mesh Networks

Sparse traffic grooming is a practical problem to be addressed in heterogeneous multi-vendor optical WDM networks where only some of the optical cross-connects (OXCs) have grooming capabilities. Such a network is called as a sparse grooming network. The sparse grooming problem under dynamic traffic in optical WDM mesh networks is a relatively unexplored problem. In this work, we propose the maximize-lightpath-sharing multi-hop (MLS-MH) grooming algorithm to support dynamic traffic grooming in sparse grooming networks. We also present an analytical model to evaluate the blocking performance of the MLS-MH algorithm. Simulation results show that MLSMH outperforms an existing grooming algorithm, the shortest path single-hop (SPSH) algorithm. The numerical results from analysis show that it matches closely with the simulation. The effect of the number of grooming nodes in the network on the blocking performance is also analyzed

An exploration of changing identity, linguistic challenges and cultural surprises -- a case study of a UK University group of diverse Chinese language students studying abroad

With the development of the internationalisation of China and Chinese universities as well as China’s increasing prominence economically, there are increasing numbers of international students who choose Chinese studies as their major and come to China to learn the Chinese language. However, nowadays, in the research field of teaching and learning Chinese as a second language, few researchers concentrate on the beliefs, perspectives and sense of self of these students of Chinese during their Study Abroad experiences. Therefore, this research focuses on investigating the identity challenges, cultural engagement and linguistic opportunities of students of Chinese in one Higher Education institution during this important transitional experience, before, during and after studying Chinese in Mainland China. Drawing on poststructuralist perspectives to establish a theoretical position and narrative identity theory as a key conceptual frame, an instrumental case study formed the approach to data collection. The case study involved diverse learners of Chinese as a second language on courses at a UK higher university and with experience of studying abroad in China or other Chinese-speaking jurisdictions. Interviews were used as a means of gaining rich data and insights into personal experiences and conflicting interactions as the students attempted to develop linguistically but also tried to negotiate a sense of belonging within this new environment. The results are reported using different narrative strands of the Chinese language (CL) learners and how they defined and redefined the concept of who they were and who they were becoming as they experienced Chinese language interactions and Chinese culture during their experiences abroad and on their return. The findings concluded with three main narrative strands: i) Linguistic self: after studying in China, Chinese language learners (CLL) believed that they were ‘not afraid to speak Chinese’ and felt a sense of achievement as they engaged in diverse interactions and gradually achieved some degree of acceptance as new Chinese speakers. ii) Social and cultural self: The acculturation process was very much shaped by individuals’ unique choices and experiences. The desire to speak Chinese, the acceptance of and engagement with Chinese culture, and native speakers’ approval of their efforts, helped them to develop a sense of belonging, creating a shift in CLLs’ socio-cultural identity. iii) Hybrid self: Their original cultural identity, whether monocultural or intercultural as part of the learner’s background, played an important role in influencing the learner’s sense of self in the target language community. Most of the CLLs believed that they came through this transcultural journey with a more nuanced cultural hybrid identity after living in China, but they always had some degree of still feeling like an ‘‘outsider’’

A hybrid single-mode laser based on slotted silicon waveguides

An InGaAsP-Si hybrid single-mode laser based on etched slots in silicon waveguides was demonstrated operating at 1543 nm. The InGaAsP gain structure was bonded onto a patterned silicon-on-insulator wafer by selective area metal bonding method. The mode-selection mechanism based on a slotted silicon waveguide was applied, in which the parameters were designed using the simulation tool cavity modeling framework. The III-V lasers employed buried ridge stripe structure. The whole fabrication process only needs standard photolithography and inductively coupled plasma etching technology, which reduces cost for ease in technology transfer. At room temperature, a single mode of 1543-nm wavelength at a threshold current of 21 mA with a maximum output power of 1.9 mW in continuous-wave regime was obtained. The side mode suppression ratio was larger than 35 dB. The simplicity and flexibility of the fabrication process and a low cost make the slotted hybrid laser a promising light source

A04: A Pilot Study on the Persistence of Children\u27s Online Sports Games

Purpose: In the post-epidemic era, children\u27s physical activity has decreased sharply, and smart sports at home have gradually emerged, making online sports games an important path for children\u27s sports participation. This pilot study was to explore the persistence of children\u27s online sports game participation through exercise frequency recording and provided guidance for online sports game intervention programs. Methods: A total of 29 primary school children were enrolled, including 24 boys and 5 girls. Participants exercise autonomously through motion software. In this study, the movement of each participant was recorded through the background of the software system and exported to Excel. Two-week period was used as one stage and a total of six stages were analyzed. After preliminary collation of the data, one-way ANOVA using SPSS23.0 was performed. Results: By analyzing the motion records of the 12 weeks of online exercise, overall trend of the first five stages is linear decreasing, and the trend of the fifth and sixth stages is flat; There was no significant difference between the first stage and the fourth stage (p \u3e 0.05). The first and fifth and sixth stages showed that the differences (p \u3c 0.01). The difference between the second and sixth stages was significant (p \u3c 0.05), and the difference between the second and fifth phases was very significant (p \u3c 0.01). Conclusions: Online sports games have a certain attraction to children, ensuring the frequency of children\u27s early sports participation, but this attraction is difficult to last for a long time. Children\u27s interest in sports will decline to varying degrees with time. It is recommended to further improve and stabilize the persistence of children\u27s participation by formulating external behavioral intervention strategies and adjusting internal intervention programs