protection

摘要： Heritage Ark team, established in 2012 under the auspices of the Institute of Cultural Heritage Study at Zhejiang University, has worked in the field of digital protection for 10 years.

摘要： At present, the protection of the legend of Ding Lan Carved Wood is declining and fails to give full play to its function of building filial culture. Combined with the examination of the contemporary inheritance and protection of the legend of Ding Lan Carved Wood, we make full use of the existing resources of the legend of Ding Lan Carved Wood in urban areas and unite the cities of Xuzhou, Xingping, and Jiaozuo to put forward practical and favorable suggestions for development and inheritance, and jointly promote the exploration of the development and inheritance path of the filial culture of the legend of Ding Lan Carved Wood.

摘要： Over time,the traditional house in central Iran,which Tehran geographically belongs to,has undergone deep physical and morphological changes as a result of technological,social and economic transformations,passing from the characteristics of an introverted house enclosed by walls overlooking an inner courtyard to the multi-storey condominium with an extroverted outlook.Here the façade becomes a key element:it is a threshold between urban and private,outdoor and indoor.The article shows a mosaic of patterns and materials of the new mid-rise residential building façades via photographs and diagrams to emphasize the strict connection between contemporary design and local tradition.

摘要： 电离辐射防护与和辐射源安全基本标准(basic standards for protection against ionizing radiation and for the safety of radiation sources):既对电离辐射防护又对辐射源安全规定其基本安全要求的标准。它是电离辐射防护和辐射源安全有关标准中最高层次的标准,是制定有关电离辐射防护和辐射源安全的其它标准的基本依据。有关国际组织和我国早先制定的是辐射防护的基本安全标准,它主要对电离辐射防护规定其基本安全要求。

摘要： China’s landmark achievements and historic rise on the global stage in the past decade are destined to be deeply etched in Chinese people’s living memory and highlighted in the nation’s history.The contribution of China’s economy to the global growth has stood at around 30 percent for years,making it the largest engine of global economic growth.Beyond the economic front,China’s impressive progress can also be found in ecological protection,cultural development and protection,science and technology,and many other areas.As China becomes more integrated with the world by expanding and deepening its opening-up,more and more foreigners have made their way to China,partaking in its development or engaging in exchange and cooperative activities with the country.

摘要： Software-defined network(SDN)becomes a new revolutionary paradigm in networks because it provides more control and network operation over a network infrastructure.The SDN controller is considered as the operating system of the SDN based network infrastructure,and it is responsible for executing the different network applications and maintaining the network services and functionalities.Despite all its tremendous capabilities,the SDN face many security issues due to the complexity of the SDN architecture.Distributed denial of services(DDoS)is a common attack on SDN due to its centralized architecture,especially at the control layer of the SDN that has a network-wide impact.Machine learning is now widely used for fast detection of these attacks.In this paper,some important feature selection methods for machine learning on DDoS detection are evaluated.The selection of optimal features reflects the classification accuracy of the machine learning techniques and the performance of the SDN controller.A comparative analysis of feature selection and machine learning classifiers is also derived to detect SDN attacks.The experimental results show that the Random forest(RF)classifier trains the more accurate model with 99.97%accuracy using features subset by the Recursive feature elimination(RFE)method.

摘要： The coastal strip of the Nile delta has been vulnerable to environmental hazards. Field surveys, interpretation of Landsat enhanced thematic mapper imageries (ETM), and hydrochemistry analysis of the water samples was used as methods and materials to detect the hazards associated with climate change which threaten some natural protection coastal areas of the central part of the Nile Delta and assess its magnitude. The invasion of seawaters is the main hazard due to the impacts of global warming phenomena. Elimination of the coastal dunes which act as natural defenses has been accelerating the negative impacts that have been appearing clearly on low-lying lands. Planting that protected areas of the coastal strip are considered the most suitable ecosystem-based and most beneficial solution should be authorized and adopted by the local administration to preserve those areas and adapt to these disasters.

摘要： China has continually worked on space debris research,complying with the White Paper“China’s Space Program:A 2021 Perspective”.This paper aims to clarify China’s research and application progress from 2020 to 2021 in space debris observation,prediction,protection,and mitigation.In this context,it also summarizes the space debris mitigation efforts made by the Chinese government and provides the expectation of future direction for the work.

摘要： From a new vision of the theory of soil and water ecology,it is discussed that soil and water ecology is the core issue of contemporary biodiversity protection.First,soil and water ecology constitutes the habitat for biological survival,and is the premise and foundation of biodiversity.Second,soil and water ecology is the material and energy source of biological survival and the prerequisite of biodiversity.Human beings are the beneficiaries and operators of soil and water ecology,which is related to the future and destiny of biodiversity on the earth.It should protect and restore the original,diverse,complete and clean soil and water ecology on the earth from three aspects of protecting pure natural soil and water ecology,protecting and restoring natural soil and water ecology,and building and regenerating artificial soil and water ecology,so as to fundamentally achieve biodiversity protection.

摘要： A decade of China’s awakening to environmental protection I have been working in the wildlife conservation and environmental protection field for nearly 40 years.From 2013 to before the outbreak of the COVID-19 pandemic,I visited China for one or two months every year,working with my Chinese colleagues,and visiting and learning from NGO peers.

摘要： In recent years, with the development of communications, communications grid including the formation of digital microwave, fiber optic, wireless and other means of communication has formed. Optical fiber communication with the communication long distance relay, confidentiality, transmission loss, showedtremendous advantages in the communications field, which has become the one of the main pillars of moderncommunication. However, the growing capacity of optical fiber transmission network and increasing bearerservices bring challenges for maintenance of communications cable. The emergence of optical line automaticprotection system made maintenance easier. This article describes the optical protection program, principles,processes, networking, features and advantages, and so on.