Global Dynamic Responses and Progressive Failure of Submerged Floating Tunnel Under Cable Breakage Conditions

The Submerged Floating Tunnel(SFT)relies on a tensioned mooring system for precise positioning.The sudden breakage of a single cable can trigger an immediate alteration in the constraint conditions of the tube,inducing a transient heave response within the structure along with a transient increase in cable tension experienced by adjacent cables.In more severe cases,this may even lead to a progressive failure culminating in the global destruction of the SFT.This study used ANSYS/AQWA to establish a numerical model of the entire length SFT for the hydrodynamic response analysis,and conducted a coupled calculation of the dynamic responses of the SFT-mooring line model based on Orca Flex to study the global dynamic responses of the SFT at the moment of cable breakage and the redistribution of cable internal forces.The most unfavorable position for SFT cable breakage was identified,the influence mechanism of cable breakage at different positions on the global dynamic response was revealed,and the progressive chain failure pattern caused by localized cable breakage are also clarified.

A Global Responsibility

China plays a bigger role in international peacekeeping efforts By increasing and diversifying its involvement in UN peacekeeping I missions, China is fulfilling its obli-gations as a responsible and peaceful power in the world community. In providing critically needed aid in some of

基于全局响应面算法的Q235B钢的Johnson-Cook模型参数最优

This study investigates the mechanical properties of Q235B steel through quasi-static tests at both room temperature and elevated temperature.The initial values of the Johnson-Cook model parameters are determined using a fitting method.The global response surface algorithm is employed to optimize and calibrate the Johnson-Cook model parameters for Q235B steel under both room temperature and elevated temperature conditions.A simulation model is established at room temperature,and the simulated mechanical performance curves for displacement and stress are monitored.Multiple optimization algorithms are applied to optimize and calibrate the model parameters at room temperature.The global response surface algorithm is identified as the most suitable algorithm for this optimization problem.Sensitivity analysis is conducted to explore the impact of model parameters on the objective function.The analysis indicates that the optimized material model better fits the experimental values,aligning more closely with the actual test results of material strain mechanisms over a wide temperature range.

The Response of Climatic Jump in Summer in North China to Global Warming

To reveal climatic variation over North China, the climatic jumps in summer in Beijing are analyzed using the data of precipitation of summer (June, July, August) during the period of 1841-1993, in which those missed before 1950 were reconstructed by the stepwise regression method with minimum forecast error. The climatic jumps at different scales are analyzed using different diagnostic methods with different decade (10-100 years) windows. Some new methods and ideas are proposed. The variance difference, the linear tendency difference, and the difference of power spectral distribution between the samples before and after the period at the moving point in the center of the series are compared with other methods (for example, Mann—Kendall test, t— test, and accumulative anomaly etc.). Considering the differences among the statistics above, a synthetic jump index is also proposed in order to get the definite jump points in the moving series. The results show that the climatic jumps in the area occurred in the 1890s, the 1910s and the 1920s, and mostly in the 1920s, which suggests that the local climatic jumps in North China have a simultaneous response to the global warming in the hundred-year scales. Key words Climatic jump - New diagnostic statistics - Synthetic jump index - Response to global warming This Study was supported by the “ National Key Programme for Developing Basic Sciences” G1998040901-1.

A METROD PREDICTING RESPONSE OF SEDIMENT YIELD TO POSSIBIE CHANGE OF PRECIPITATION DUE TO GLOBAL GREENHOUSE WARMING:AN EXAMPIE FROM NORTH FRINGE OF THE LOESS PLATEAU, CHINA

Starting from the supposition of time-space substitution, the Langbein-Schumm's Law was applied to deal with response of fluvial erosion System to the changes in mean annual Precipitation induced by global green-house warming. As a result, a simple method was put forward to predict change in sediment yield, with Ningxia Hui Autonomous Region in the northern fringe of the Loess Plateau of China as an example. Results show that, even the change in mean annual precipitation is the same, the direction and magnitude of the resultant chang in sediment yteld would be quite different in fferent physico-geographical zones. When mean annual precipitation is increased, sediment yield in arid or semi-arid areas with a mean anntal Peripitation of less than 400 mm will be increased, while sediment yield in sub-humid or humid areas with a mean annual precipitation of more than 400 mm will be decreased.Additionally, the complex response of fluvial erosion system in time series due to the lag of change in vegetation behind the changn in precipitation has also been qualitatively discussed in this paper.

CHINA'S VEGETATION/ECOSYSTEM RESPONSE TO GLOBAL CHANGE: RESEARCH PROGRESS & PROSPECTS

This paper presents the latest developments in the re search progress on mechanisms by which natural plants and crops respond to the doubled concentration of CO2 in the atmosphere, resultant climatic change and the modeling of vegetation and eco-systems in China. In addition, it points out that the future study on global change and terrestrial ecosystems should stress m(?)iti-disciplinary teamwork and inter-discipline penetration. Finally, the paper emphasizes 10 research realms in the field to be enhanced in the future.

Special Issue on "Response of Polar Organisms and Natural Environment to Global Changes"

High altitude and high latitude regions on Earth are experiencing rapid changes in climate, with impacts on polar organisms and the environment. The persistent cold and sometimes inhospitable conditions create unique ecosystems and habitats for polar organisms.

Inviting Contributions to a Special Issue on "Response of Polar Organisms and Natural Environment to Global Changes"

Dear Colleagues, We would like to invite you to submit manuscripts to a special issue of the journal Advances in Polar Science （APS） on ＂Response of Polar Organisms and Natural Environment to Global Changes＂.

The Impact of Global Financial Crisis on China Chemical Fiber Industry and Response Strategies (Part Ⅱ)

Prospects of Global Financial Crisis and Economic Crisis The widely spreading global financial crisis has halted the fast growth of world economy in five consecutive years,and heavily stricken the financial and economic sectors worldwide.It’s second only to the "Great Depression" in the 1930’s.Governments

Harmonic balance method with alternating frequency/time domain technique for nonlinear dynamical system with fractional exponential

Comparisons of the common methods for obtaining the periodic responses show that the harmonic balance method with alternating frequency/time （HB-AFT） do- main technique has some advantages in dealing with nonlinear problems of fractional exponential models. By the HB-AFT method, a rigid rotor supported by ball bearings with nonlinearity of Hertz contact and ball passage vibrations is considered. With the aid of the Floquet theory, the movement characteristics of interval stability are deeply studied. Besides, a simple strategy to determine the monodromy matrix is proposed for the stability analysis.

Mooring Truncation Design of a Deepwater SPAR

To solve the dimensional limitations of physical models in tests, an equivalent water depth truncated design for a classical SPAR working in 913 m water was investigated. The water depth was reduced to 736m and then to 552m. As this was done, the mooting line lengths, EA value, and mass per meter were adjusted. Truncation rules and formulas for parameters and truncation factors were proposed. SPAR static characteristics were made to be consistent with those at full water depth. Then further time-domain coupled analysis was carried out for the SPAR when the mooting system experienced waves. The mooring lines were simulated by quasi-static method. Global responses and mooring line forces were found to agree well with test results for a prototype at that water depth. The truncation method proved to be robust and reliable.

Corporate Governance, Sustainable Development and Value Creation Some Evidences From Italian Listed Companies

Modern corporate situations, characterized by the globalisation of the markets and of the information, highlight the need to link the potential of a not transient growth to the adequate reconciliation of all the expectations converging around the entrepreneurial formula and not only of those attributable to shareholders. In such a defined context, corporate governance tends to evolve from a situation of primary care for the expectations of shareholders （shareholder＇s view） and for the correlated financial responsibility, to a wide consideration of all the stakeholders （stakeholder＇s view） and related responsibilities （financial, environmental, social, administrative）. The correct carrying out of governance processes requires, therefore, a clear focus on sustainable development and on the related assumption of a concept of global responsibility. The decisions made by the governing bodies must be driven by the purpose to create value in the long term according to conditions of fairness and sustainable development. To sum up, this research aims to deepen the existing connections between corporate governance, sustainable development and value creation on the basis of the empirical analysis of a limited number of listed Italian companies afferent to the public utilities sector. The paper, based on a deductive approach, is composed of two distinct but strictly connected parts： the first theoretical and the second empirical. The empirical research consists of a content analysis of the most recent documents （sustainability reports and annual reports） worked out by the selected companies. The results obtained about the degree respect of sustainable development conditions by each company are linked to the related value dimension （social, economic, competitive and environmental performance） aimed at verifying if the assumption of a corporate governance approach inspired by sustainability is susceptible of favouring the company development in a medium long term. From the delivered research it emerges how public utilities that promote behaviours in line with the sustainability conditions are marked out by stable growth paths. Conversely, the companies that assume a vision mainly addressed to the economic dimension, neglecting the other areas are generally compromised in the performance realized.

Multivariate adaptive regression splines based simulation optimization using move-limit strategy

This paper makes an approach to the approximate optimum in structural design,which combines the global response surface（GRS） based multivariate adaptive regression splines（MARS） with Move-Limit strategy（MLS）.MARS is an adaptive regression process,which fits in with the multidimensional problems.It adopts a modified recursive partitioning strategy to simplify high-dimensional problems into smaller highly accurate models.MLS for moving and resizing the search sub-regions is employed in the space of design variables.The quality of the approximation functions and the convergence history of the optimization process are reflected in MLS.The disadvantages of the conventional response surface method（RSM） have been avoided,specifically,highly nonlinear high-dimensional problems.The GRS/MARS with MLS is applied to a high-dimensional test function and an engineering problem to demonstrate its feasibility and convergence,and compared with quadratic response surface（QRS） models in terms of computational efficiency and accuracy.

"Forever chemicals":a sticky environmental problem

The discovery and widespread use of per-and poly-fluoroalkyl substances(PFAS)have exemplified the beneficial role of chemistry in modern life,yet they.have also underscored significant environmental and health concerns.Termed "forever chemicals"due to their remarkable persistence,PFAS present formidable challenges in terms of contamination and toxicity.Efforts to address these challenges have led to the development of innovative degradation technologies,such as hydrothermal alkali treatment(HALT),low-temperature mineralization,and mechanochemical degradation,offering promising solutions to PFAS remediation.However,these advancements must be accompanied by robust investment in research,collaboration among stakeholders,and global responsibility to ensure effective management of PFAs contamination and mitigate its adverse impacts on ecosystems and humanhealth.

Global Development Equity： Its Ethical Nature and Historical Construction--With a Discussion of the Essence and Problems of the ＂Theory of China＇s Neo-colonialism＂

Global development equity is a concrete unity of the ethics of rights and responsibilities, modern and historical ethics, subject-centered and ecological ethics, and individual and collective ethics. Its construction requires prolonged effort and a comprehensive grasp of modernity, the laws of social development and the overall logic of social development, as well as an all-around readjustment of concepts, institutions and behaviors. Within the concrete and historical unity of rights and responsibilities, ＂the unity of limited global rights and limited global responsibilities＂ is an important principle for constructing global development equity. Declarations that China is practicing neo-colonialism are in fact inherently associated with Eurocentrism. The peaceful, joint and comprehensive development of China and other developing countries and China＇s historical advancement of global development equity are practical refutations of such assertions.

Conscious Business——the Future of Doing Business Responsibly in a Globalized World

Conscious capitalism consists of four interconnectedand mutually reinforcing key pillars.These are higher purpose, stakeholder integration,conscious leadership, and conscious culture.In the future, it will be much harderfor businesses to hire and keep employees ifwork doesn’t have anything to offer that creates not onlythe product or the service but a higher purpose.

Relationship between local damage and structural dynamic behavior

Damage in the structures alters the structural dynamic behavior. Damage generally occurs locally in the components of structures, and its effect often exhibits in the changes of both local and global characteristics of structures. Better understanding of this relationship helps to monitor and assess the condition of structures and develop dynamics-based structural health monitoring techniques. In this study, the relationship between the local damage and structural dynamic behavior is investigated. To validate the concept, an experiment of a three-dimensional (3-D) steel frame structure with different magnitudes of local damage is illustrated. The experimental results indicate that the change of global resonant response between the intact and damage structure is not obvious. The change of local resonant responses measured near the location of saw-cut crack damage is quite significant. The experimental study conducted indicates that the local resonant responses at the low order resonance can be used as an effective damage identification method to detect and quantify the local damage in the 3D frame structures.