In order to clarify the connotation and governance path of metaverse safety & security and further enrich the theory of metaverse safety & security，the concept of metaverse safety & security was put forward based on a large safety & security pattern，and the basic features of metaverse safety & security were analyzed. Moreover，the governance path of metaverse safety & security was proposed. The results show that metaverse safety & security refers to the state or ability of the metaverse to reshape spatial and temporal stability，social civilization advancement and human well-being enhancement from the influence of unfavorable factors，and it has eight basic characteristics，namely，relativity，complexity，vibration，extensiveness，immediacy，relevance，publicity，and multidimensionality. Metaverse safety & security governance should integrate the development and safety & security of the metaverse，adhere to the principle of joint consultation and sharing，build a "technology-rule-society" trinity of governance models，and strive to enhance the digital safety & security capacity of the metaverse.

In order to improve the safety efficiency of heavy construction machinery installation and lifting operation and improve the visibility of installation and lifting operation personnel，a multi-agent visual accessibility BIM simulation method based on the visual cone method was proposed. The multi-agent visual task of the heavy construction machinery was obtained through the decomposition of the visual task of heavy construction machinery. Taking the installation and dismantling operation of the wk-35 electric shovel as the research object，the multi-agent visual task of hoisting driver，signal operator and cable operator was analyzed，and the multi-agent visual BIM simulation scene of installation，dismantling and hoisting operation was constructed by using Computer Aided Three-dimensional Interactive Application (CATIA) human factor simulation module. The visual cone method was used to calculate the multi-agent visual accessibility value in the process of installation and lifting. The process parameters of the BIM model were adjusted，the trend of multi-agent vision was deduced，and the multi-agent visual accessibility of installation，disassembly and hoisting was evaluated. The simulation results show that the visual accessibility of the lifting driver is poor in the process of lifting and descending，but good in the process of translation. The position of the signal operator and cable man is closely related to their visual accessibility. The visual accessibility of the signal operator is best when the visual field of view just covers the lifting driver and cable man. The cable man needs to constantly adjust his position to achieve the best visual accessibility.

In order to clarify the mechanism of safety and security incident causation from a safety and security intelligence perspective，and to consolidate the theoretical foundation for the investigation，analysis and prevention，and control of safety and security incidents from a safety and security intelligence perspective，research on safety and security incident causation model from a safety and security intelligence perspective was conducted. Firstly，according to the model for safety and security intelligence-safety and security behavior double loops，this paper analyzed the causes of safety and security incidents from a safety and security intelligence perspective. Secondly，the safety and security incident causation model from a safety and security intelligence perspective was constructed and explained. Finally，this paper analyzed the application of the safety and security incident causation model from a safety and security intelligence perspective with a safety and security incident on Line X of a city metro. The research shows that the safety and security incident causation model from a safety and security intelligence perspective is a safety and security incident causation system consisting of a safety and security intelligence loop and a safety and security behavior loop. According to this model，safety and security intelligence failures in the safety and security intelligence loop can lead to the disruption and collapse of the safety and security behavior loop of the system，resulting in a safety and security incident in the system.

In order to explore the influence of initiation sequence on the crushing effect of open steps and the surrounding environment，the LS-DYNA simulation software was used to calculate the step blasting model under different initiation sequences. First，the physical and mechanical characteristics of the model under different initiation orders were analyzed. Then，the field test was conducted to verify the simulation results and study the influence of the initiation sequence on the blasting vibration strength and rock crushing degree. The results show that the stacking effect，which changes the stress wave，shows the breaking effect and blasting vibration strength. The hole-by-hole blasting technology can effectively reduce the blasting vibration so as to reduce the adverse effects on the surrounding environment，but the rock-crushing effect is not ideal; the rock passing rate is 81.52%. Compared with the hole-by-hole blasting，the passing rate of wave sequential blasting gravel is increased by 11.68%，and the amount of single-hole collapse is increased by 16.8% when the hole net parameter is increased to 3 m×7 m，which effectively reduces the explosive consumption and reduces the comprehensive cost. However，it produces a large blasting vibration strength，which needs to pay attention to the impact on the surrounding environment.

In order to improve the construction of undergraduate curriculum settings in the field of safety engineering，a total of 68 outstanding undergraduate theses (designs) from 38 universities in 2021 were collected and organized in this study. CiteSpace software was used to perform cluster analysis on the keywords of the theses，and the current research topics of undergraduate theses (designs) were clarified. Subsequently，the industry background of safety engineering in the 38 universities was investigated，and the differences of curriculums between representative Chinese and foreign universities in safety-related disciplines were statistically analyzed. The results show that the high-frequency keywords in the 68 theses are mainly related to the following aspects: "numerical simulation"，"disaster warning"，"safety management system" and "resilience". Based on the investigation results of the industry background of universities，among the 68 theses(designs)，the number of theses in the direction of public safety accounts for 45.6%，and the number of papers on mine safety accounts for 8.82%，but nearly 40% of the 38 universities take mine safety as a key service area，which showed that the research directions of safety disciplines theses has shifted from focus on industry safety to "general safety science". However，the characteristic curriculums still primarily focus on industry safety，with some repetition in the content of basic curriculums. Furthermore，there is a lack of numerical simulation curriculums. These factors make it difficult for the currently offered curriculums to support students in conducting their graduation projects. Additionally，compared with safety-related disciplines in foreign universities，it was found that the number of basic curriculums in safety engineering in China is relatively high，whereas the practical curriculums show the opposite condition.

To effectively identify and assess different types of risk events in the risk zoo，and compare the difference of different risk metaphor events，based on theory of complex system thinking and vulnerability，risk metaphor events were identified and analyzed from 6 dimensions of risk certainty，universality，periodicity，stability，tolerance and reversibility. An assessment model of risk metaphor events was constructed based on the theory of the public safety triangle. The results show that through complex system thinking，we summarize and classify the general characteristics of risk metaphor events，and establish a multi-dimensional quantitative assessment model of risk metaphor events，which provides the application ideas and method logic for the control of risk metaphor events and ensure the scientific and reasonable establishment of risk metaphor events. Finally，the 4P (Prohibit，Suspend，Postpone，Prevent) strategy of risk prevention is proposed for the different cognitive characteristics of risk metaphor events，which provides a reference for organizations to carry out risk event control.

The association between MHO and HUA and whether liver enzyme abnormalities could modify this association were studied. The cross-sectional study was conducted using 6，868 steelworkers in Hebei Iron and Steel Company who participated in occupational medical examinations as the study population. The data were analyzed using logistic regression models and interaction effect model. The results show that，in a multiple adjusted logistic model，the risk of HUA is increased 2.13-fold (odds ratio (OR)=2.13，95% confidence interval (CI): 1.08-4.21) for metabolically healthy generalized obesity (MHGO). The risk of HUA is increased 2.25-fold (OR=2.25，95%CI: 1.14-4.45) for metabolically healthy abdominal obesity (MHAO). In stratified analysis，in the group with elevated liver enzymes，the prevalence of HUA in steelworkers with MHO(MHGO and MHAO) is significantly higher than that in the group with normal liver enzymes，and the interaction between obesity phenotypes and liver enzyme levels has a statistically significant effect on HUA (P<0.05). MHO is associated with a high prevalence of HUA. Liver enzyme levels may alter the relationship between MHO and HUA.

To mitigate the long-term impact of horizontal loads (such as wind，waves and currents) on offshore wind turbines，a finite element model for the ultimate bearing capacity of heterogeneous clay single-pile foundations was developed using ABAQUS software. Temperature was employed as a virtual variable to reflect the relationship between shear strength of heterogeneous soil and depth. The Model Change technique was employed to achieve geostatic equilibrium，and the obtained results regarding the variation in horizontal loads on single-pile foundations were compared with centrifuge test outcomes to validate accuracy. Combining the failure modes of soil under horizontal ultimate loads for both rigid and rigid-flexible piles，the influence of parameters such as aspect ratio，soil elastic modulus coefficient and pile-soil friction coefficient on the horizontal ultimate bearing capacity of single pile foundations was analyzed. The findings indicate that with an increase in pile embedment depth，the pile transitions from a rigid state to a rigid-flexible state，and the soil failure mode shifts from wedge and rotational failure to wedge，full-flow and rotational failure. The soil elastic modulus coefficient has a minor impact on the horizontal ultimate bearing capacity of single-pile foundations，while the aspect ratio and pile-soil friction coefficient exert a significant influence.

In order to investigate the mechanical response of sandstone under cyclic stress from the energy perspective，the loading and unloading tests conducted along three cyclic paths which included an incremental step-by-step increase in initial peak stress at 10 MPa，an incremental step-by-step increase in initial peak stress at 80 MPa，and a constant peak stress maintained at 100 MPa. Subsequently，we analyzed the evolution characteristics of each energy component of sandstone based on the stress-strain curve and energy calculation results，taking into account the number of cycles and peak stress. The results show that as the number of cycles and peak stress increase，the hysteresis loop migrated to the direction of strain increase obviously only in the second cycle at the initial peak stress of 80 and 100 MPa. Different stress cycle paths make the unit volume dissipated energy shows different stage evolution characteristics. The energy values of sandstone change from a quadratic to a linear growth law as the peak stress increases in the hierarchical cyclic loading and unloading way，while in the constant amplitude cyclic loading and unloading way with the peak stress constant at 100 MPa，the unit volume energy and unit volume elastic energy of sandstone show an open downward quadratic decrease trend and the unit volume dissipative energy shows an exponential decrease trend. The effect of cyclic paths on the energy of sandstone in different stress ranges is quite different. In a comparison of the single and the hierarchical cyclic loading and unloading way，the energy difference is less than 10% when the peak stress is 80 MPa，while the energy difference is 22.74%-62.58% when the peak stress is 100 MPa.

In order to better develop and sustainably utilize saferesources (which is newly created composite word that means the resources on safety & security in this paper)，the disciplinary theory and its embryonic form of saferesourcesology (which is newly created composite word that means the science of resources of safety & security in this paper) were investigated，based on the new prospect that safety & security was a type of extremely popular and important resource. The whole study stood at the height of the science of science and viewed from the perspective of interdisciplinary science，and adopted the research methods of survey research，innovative thinking，theoretical analysis，logical induction and prediction method. Then，the definition and connotation of saferesources and saferesourcesology，the nature and classification of saferesources，the research objects and contents of saferesourcesology，the basic principles and research methods of saferesourcesology，the research directions and prospects of saferesourcesology，etc，were systematically investigated. The results show that saferesources have both the main characteristics of safety & security and resources. The characteristics of saferesources can be divided into two categories: social characteristics and their own characteristics. Eight aspects of main research contents of saferesourcesology are given from different perspectives and levels. Ten basic principles of saferesourcesology are condensed from the fundamental level of the discipline. Typical research methods of saferesourcesology are summarized based on the interdisciplinary nature. The above research results have formed the core foundational theory and disciplinary framework of saferesourcesology，which has references and guides for the follow-up research of the specific contents of saferesourcesology and the acceleration of the formation of an independent new discipline of saferesourcesology.