ADS-B Anomaly Data Detection Model Based on Deep Learning and Difference of Gaussian Approach

Due to the influence of terrain structure,meteorological conditions and various factors,there are anomalous data in automatic dependent surveillance-broadcast(ADS-B)message.The ADS-B equipment can be used for positioning of general aviation aircraft.Aim to acquire the accurate position information of aircraft and detect anomaly data,the ADS-B anomaly data detection model based on deep learning and difference of Gaussian(DoG)approach is proposed.First,according to the characteristic of ADS-B data,the ADS-B position data are transformed into the coordinate system.And the origin of the coordinate system is set up as the take-off point.Then,based on the kinematic principle,the ADS-B anomaly data can be removed.Moreover,the details of the ADS-B position data can be got by the DoG approach.Finally,the long short-term memory(LSTM)neural network is used to optimize the recurrent neural network(RNN)with severe gradient reduction for processing ADS-B data.The position data of ADS-B are reconstructed by the sequence to sequence(seq2seq)model which is composed of LSTM neural network,and the reconstruction error is used to detect the anomalous data.Based on the real flight data of general aviation aircraft,the simulation results show that the anomaly data can be detected effectively by the proposed method of reconstructing ADS-B data with the seq2seq model,and its running time is reduced.Compared with the RNN,the accuracy of anomaly detection is increased by 2.7%.The performance of the proposed model is better than that of the traditional anomaly detection models.

Mechanism of Solid State Fermentation in Reducing Free Gossypol in Cottonseed Meal and the Effects on the Growth of Broiler Chickens

[Objective] This study aims to reduce the free gossypol(FG) and improve utilization rate of cottonseed meal(CSM) by solid state fermentation(SSF). [Method]Bacillus subtilis GJ00141 and Saccharomyces cerevisiae GJ00079 were applied for the SSF and the optimal carbon source, nitrogen source, inorganic salt, moisture content, inoculum level, fermentation temperature, and fermentation time were investigated. The detoxifying effects of different products of GJ00141 were examined with gossypol as substrate. A total of 90 one-day-old broilers were randomized into group A [control, basal diet with 36% soybean meal(SM)], group B(basal diet with 18% SM and 18% CSM), and group C [basal diet with 18% SM and 18% fermented CSM(FCSM)] and thereby the influence of FCSM on the growth of broilers was explored. [Results] The maximum reduction rate(59%) of FG was achieved under the following fermentation conditions: solid medium composed of 96% CSM, 1%glucose, 1% ammonium sulfate, and 2% corn grits, 45% moisture content, 20%inoculum, fermentation at 30 °C for 60 h. Both the viable and inactivated cells of GJ00141 can reduce the content of gossypol, but the reduction rates were only about 20% after 72 h of incubation. Cellular contents and supernatant demonstrated strong detoxifying activity, which achieved the reduction rates of about 95% after 48 h, and the removal was free from the influence of proteinase K, heat, or EDTA. In the 42 d feeding experiment on broilers, the ratios of feed to gain were insignificantly different between the group C and group A. [Conclusion] This method achieved high rate of removing FG in CSM. The reason was the likelihood that the stable compounds in the cellular contents and supernatant of GJ00141 adsorb or bind to FG. Broilers grew well with the FCSM. Thus, it was an efficient detoxifying method for CSM.

Enhancement Dataset for Low Altitude Unmanned Aerial Vehicle Detection

In recent years,the number of incidents involved with unmanned aerial vehicles(UAVs)has increased conspicuously,resulting in an increasingly urgent demand for developing anti-UAV systems. The vast requirements of high detection accuracy with respect to low altitude UAVs are put forward. In addition,the methods of UAV detection based on deep learning are of great potential in low altitude UAV detection. However,such methods need high-quality datasets to cope with the problem of high false alarm rate(FAR)and high missing alarm rate(MAR)in low altitude UAV detection,special high-quality low altitude UAV detection dataset is still lacking. A handful of known datasets for UAV detection have been rejected by their proposers for authorization and are of poor quality. In this paper,a comprehensive enhanced dataset containing UAVs and jamming objects is proposed. A large number of high-definition UAV images are obtained through real world shooting, web crawler, and data enhancement.Moreover,to cope with the challenge of low altitude UAV detection in complex backgrounds and long distance,as well as the puzzle caused by jamming objects,the noise with jamming characteristics is added to the dataset. Finally,the dataset is trained,validated,and tested by four mainstream deep learning models. The results indicate that by using data enhancement,adding noise contained jamming objects and images of UAV with complex backgrounds and long distance,the accuracy of UAV detection can be significantly improved. This work will promote the development of anti-UAV systems deeply,and more convincing evaluation criteria are provided for models optimization for UAV detection.

Ecological Benefit Evaluation of Agricultural Heritage System Conservation——A Case Study of the Qingtian Rice-Fish Culture System

In order to better understand the developmental conditions and trends of the biodiversity at agricultural heritage sites,the structure and function of the ecosystem and ecological environment in Qingtian Rice-Fish Culture System is examined in the decade since the implementation of the GIAHS project.Through the collection of historical data and sample-plot survey,this study collates the data from 2005 to 2013 related to the heritage site to evaluate the ecological benefit of the Agricultural Heritage System conservation.The results show that:(1)Since the implementation of heritage conservation,the variety of traditional rice grown at the heritage sites basically remains stable,the varieties of other crops basically remain unchanged and the varieties of fruit trees and medicinal plants have developed at faster rates.As the ecological environment at the heritage sites gradually improved,the species and richness of the biodiversity in the ecosystem have increased,especially the increasing growth of egrets and boars.(2)From 2005 to 2013 in the Fangshan Town of Qingtian County,the ecosystem areas identified as river,forest,urban and bare land have increased.The increased area of the urban ecosystem is the largest one of them,which is up to 20.30 ha;while the area of the forest ecosystem has increased to 7.29 ha.The areas of wetland,reservoir,farmland and grassland have been reduced,and the area of grassland ecosystem has been reduced the most with a reduction of 28.87 ha.From the changes in the values of the ecosystem services of different ecosystem types,the values of forest ecosystem services have achieved the most growth,reaching up to 92000 yuan yr-1 and the growth of the river and bare land ecosystem service values are not obvious.(3)Over nearly a decade,the soil nutrients and the water quality of rice fields at the heritage site have not obviously changed and the plant diseases and insect pests in the rice fields have not been aggravated.The monitoring indexes are far better than the standard values.With the great support of the local government,the production and living conditions and the living environments of farmers in the villages of the heritage sites have been greatly improved through road reconstruction,water improvement,toilet enhancements and the greening,brightness and beautification of the villages.

Ten Years of GIAHS Development in Japan

Approximately ten years have passed since Globally Important Agricultural Heritage Systems(GIAHS)was introduced to Japan in 2011,with 11 GIAHS sites designated so far.The Japan Nationally Important Agricultural Heritage Systems(J-NIAHS),which considers resilience,multi-stakeholder participation and sixth industrialization,was subsequently established in 2016,and has designated 15 J-NIAHS sites.GIAHS sites can be classified into three major types:Landscape,farming method,and genetic resource conservation types,and most Japanese GIAHS sites are of the landscape type.Since there is almost no national subsidy for GIAHS or J-NIAHS,designated sites are expected to secure funding for conservation from their own efforts.For this reason,a voluntary network of the Japanese GIAHS sites has been active in promoting cooperation on GIAHS conservation.The priorities of the Japanese GIAHS have focused on raising public awareness about GIAHS and J-NIAHS,improving livelihoods,as well as fostering the international exchange of experience and knowledge regarding Agricultural Heritage Systems,especially among Japan,China and Korea.

Design and Application of the Annual Report of Globally Important Agricultural Heritage Systems(GIAHS)Monitoring

Scientific and effective heritage monitoring can not only realize the conservation of the heritage itself and the maintenance of its values,but it can also realize the sustainable development of the heritage site.In order to promote the conservation and management of Globally Important Agricultural Heritage Systems(GIAHS),this study proposed a design for the annual report of GIAHS monitoring under the overall framework of the GIAHS monitoring system,and explored the application of the annual report in the first GIAHS site in China:the Qingtian Rice-Fish Culture System.In the design scheme of this study,the GIAHS annual monitoring report is composed of 24 monitoring items,with each of them logically related.It is to be filled in by the bureaus of the heritage site and reported through the GIAHS dynamic monitoring system.The results of an analysis of the annual reports of Qingtian Rice-Fish Culture System for four years showed that Qingtian County has taken a series of conservation and development measures which have reduced the area of abandoned paddy,enhanced the unit benefit of agri-products,and increased the farmers’income.At the same time,the heritage site is faced with various challenges and threats,such as the weakening of the tourism attraction,the aging of the heritage practitioners,and the limitation of the heritage-themed agri-products and tourism income,which need to be addressed with proper measures.The results can also provide guidance for other GIAHS based on indications that heritage sites should improve the development of cultural products,the construction of social organization and the cultivation of spontaneous publicity,and an exchange and learning mechanism should be established among them in the future.The design and application of the GIAHS annual monitoring reports can not only provide specific guidance for conducting the GIAHS monitoring,but also lay the foundation for evaluating the effectiveness of GIAHS conservation and management.This study is expected to help enrich the theory of GIAHS monitoring,further promote China’s GIAHS monitoring work,and also provide China’s experience for the benefit of international GIAHS monitoring efforts.

Progresses and Perspectives of the Resource Evaluation Related to Agri-cultural Heritage Tourism

The scientific evaluation of tourism resources is not only an important prerequisite for the development of agri-cultural heritage tourism(AHT),but it can also promote the conservation and management of Important Agricultural Heritage Systems(IAHS).With the goal of providing scientific support for the sustainable management of tourism resources,this review systematically analyzes the overall situation,research regions,developmental timeline trends,key fields and hot topics of resource evaluation research related to AHT over 2005–2020.With a comprehensive perspective that incorporates both traditional literature review and quantitative literature review,the study revealed four important aspects of AHT research.(1)Relevant articles could be divided into two phases,a development-oriented period(2005–2012)and a conservation-oriented period(2013–2020).(2)GIAHS accounts for the absolute majority(about 66.7%)of relevant studies.In particular,Longji Terraces System,Hani terraces system and Dong’s Rice-Fish-Duck System were the research hotspots IAHS,and Yunnan,Zhejiang and Guangxi were the research hotspot provinces.(3)Terraced landscapes and tea culture were the most popular themes in tourism resource evaluation,while sports tourism,tea culture tourism and study tours are becoming the new trends in IAHS sites.(4)Research methods have undergone a shift from qualitative to quantitative approaches,and a combination of these two in an interdisciplinary manner is becoming a new research trend.By reviewing and prospecting the relevant literature,this study not only makes a unique contribution to the tourism resource evaluation of IAHS,but also helps to enrich the relevant evaluation theories and further promote the sustainable development of heritage tourism from theoretical and methodological perspectives.

Conservation of the Important Agricultural Heritage Systems in the Economically Developed Area:Experiences,Problems and Solutions——A Case Study of Zhejiang Province

Zhejiang Province,located in the Yangtze River Delta region,is representative of China’s economically developed areas.It enjoys superior natural conditions and a long history of agriculture,and is a comprehensive agricultural area with integrated development of agriculture,forestry,animal husbandry and fishery.It has nurtured the farming culture represented by Hemudu culture and Liangzhu culture,which have given rise to numerous precious Agricultural Heritage Systems.At present,Zhejiang Province has three of the world’s Globally Important Agricultural Heritage Systems(GIAHS)and 12 China Nationally Important Agricultural Heritage Systems(China-NIAHS),so it not only has the largest number of heritages in China,but it has also attained remarkable achievements in heritage conservation.Taking Zhejiang Province as an example in combination with the rural revitalization strategy,this paper summarizes the achievements in the protection of Important Agricultural Heritage Systems(IAHS)in Zhejiang Province during the past 15 years from the aspects of increasing farmers’income,cultural Inheritance and industrial upgrading,as well as the conservation experiences in government promotion,community initiative,enterprise participation,technology driving and social linkage.Further,in view of the problems that exist in the current heritage protection,such as imperfect management of heritage sites,low participation of community residents,lack of special protection funds,and imperfect provincial management system,the following countermeasures and suggestions are put forward:(1)Improve the management mechanism for the conservation and development of Agricultural Heritage Systems;(2)Develop regional public branding of agricultural products in Agricultural Heritage System sites;(3)Increase the Agricultural Heritage System science education as well as cultural and creative product development;(4)Carry out the evaluation and recognition of IAHS at the provincial level;and(5)Provide substantial support and input to the conservation and utilization of IAHS.This study can provide some guidance for the conservation of IAHS in Zhejiang Province and it provides important reference for IAHS in the economically developed areas in China.

Sustainable or Not?Tourism Development in Agricultural Heritage Sites

Tourism is often considered as one of the dynamic conservation and adaptive management approaches in Agricultural Heritage Sites.It has been over 15 years since the GIAHS programme was initiated in China,and tourism developed quickly in the Agricultural Heritage Sites,to some extent because many researchers consider tourism as a significant engine of the local economy.However,this is contrary to the original intention of agricultural heritage tourism as it was proposed in the first place.Apparently,there are some overt problems during the tourism development process,which are mainly as follows:Some threats to Agricultural Heritage Systems are ubiquitous;The tourism development mode in Agricultural Heritage Sites is questionable;Community involvement is difficult to implement;And the negative environmental impacts are easy to overlook.Under the context of global development,the UNWTO sustainable tourism criteria provide some guidance for agricultural heritage tourism.Based on the Global Sustainable Tourism Criteria,combined with previous survey experiences and related researches,this paper analyzes the tourism sustainability of all the 15 GIAHS sites in China,and explores the current sustainable tourism development level.On this basis,an agricultural heritage sustainable tourism development framework was built in an attempt to find the road to sustainability for agricultural heritage tourism.The framework in the global and local contexts is trying to connect all the important elements related to agricultural heritage tourism according to the UNWTO sustainable tourism criteria.

Study of Ecological Compensation for Paddy Fields: Oriented towards Eco-environmental Restoration

Agricultural land provides not only food and fiber（an important element of food security）, but also serves as a non-market commodity with characteristic externalities and public services. However, there are also many negative impacts on environment of the paddy production. Thus, Payments for paddy ecosystem services encourage farmers to engage in ecological or organic agricultural practices and agro-ecological/environmental supply. However, compared with forest, wetland, and pasture, the eco-function and ecosystem services of paddy fields have gotten insufficient attention. It is necessary to establish an eco-compensation mechanism for paddy fields that boosts behavior that protects farms to benefit the ecosystem. Based on a review of eco-compensation for paddy fields, this paper proposes the policy game framework of eco-compensation for paddy fields, which is oriented to ecological restoration. Secondly, this paper introduces methods for determination of compensation standards, including the cost the farmers＇ willingness to accept, and the ecological benefits of adopting environmental friendly farming practices. And finally, this paper puts forward policy recommendations for eco-compensation for paddy ecosystems.

Ecological Theory and Practice in Tourism Research in the New Era

With the development of tourism, the number of tourists and the scope of tourism activities are increasing, and the impact of tourism on the ecological environment is gradually revealed. The ecological environment is the foundation of sustainable tourism development. Some tourist destinations lack systematic and scientific evaluation and the proper planning of tourism resources, which makes it difficult for local areas to cope with the influx of a large number of people. In these destinations, the internal system is perturbed by a series of disturbances, which leads to bad effects on the local ecological environment. In addition to endangering the development of tourism, the quality of life of local residents is also threatened. Consequently, the issues between tourism and environment have become a hot topic in the field of tourism research. Through the collection of domestic and foreign tourism literature related to ecological theories since 1990 to 2020, the status of the application of various ecological theories in the field of tourism is revealed, such as life cycle theory, landscape ecology theory, carrying capacity theory, biodiversity, ecological niche theory and ecological footprint theory. This analysis found that the application of these theories to tourism mainly focuses on empirical research, and there are few studies on the basic theories related to it. In the empirical research, innovation of the research methods is basically absent. Therefore, future research should pay more attention to the theoretical research of ecological theory in the field of tourism,and combine modern science and technology in the practical application to strengthen the innovation of research methods. In addition, the prospect of applying ecological theories in future tourism research is discussed.

小朋友发生争执应该怎么办？

我是学学前教育的。前不久，我去一个幼儿园参加面试，有名考官问我：小朋友打架或者挣抢玩具你会怎么处理？——我都懵了，不知道该怎么回答了。请问，这种问题应该怎样回答？