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2021年2月,在甘肃省民勤县西渠镇半固定沙漠区(38°57’54.8″ N,103°27’0.4″ E)和内蒙古自治区阿拉善右旗沙生植物园(39°12’47.3″ N,101°38’58.8″ E)记录到冬季集群觅食的白冠攀雀(Remiz coronatus),确认其为两省区鸟类分布新纪录。通过样线调查,描述了白冠攀雀的生境特征和分布模式,分析了形态鉴别特征、分类地位的变迁以及在两省区的记录现状等,初步认为该鸟种群数量稀少,为孤立隔离的片段化或点状孤立分布,繁殖和扩散状况还需进一步监测。

为探索绿孔雀的夜宿地选择模式及其成因,笔者于2007年3～4月和10～11月,在云南元江上游石羊江河谷绿孔雀的分布区内,采用样线法和样方法调查了绿孔雀的夜宿地生境,测定了19个生态因子。生态因子比较结果表明,夜宿地利用样方的坡度、乔木盖度、乔木胸径、落果密度、藤本密度与对照样方存在显著差异; 夜宿地的海拔高度显著高于觅食地。判别分析结果表明,绿孔雀夜宿地和对照样地之间存在着明显的分化。逻辑斯蒂回归分析结果表明,绿孔雀选择坡度大、落果多、乔木的盖度和胸径大的地区作为夜宿地。隐蔽条件和食物等关键性生态因子的配置和可获得性决定了绿孔雀的夜宿地选择行为,而人为干扰压缩了其可利用的适宜生境,降低了生境的利用程度。

很多研究表明,野生动物非法贸易是威胁野生动物生存和导致物种灭绝的原因之一。野生生物资源的消费与野生动植物保护息息相关,对野生动物的过度利用直接导致野生动物濒危。因此,有必要结合消费者行为学,研究影响野生动物消费行为和导致野生动物非法贸易的心理和社会因素,从而提出有针对性的保护策略。本文在总结前人研究成果的基础上,综述了影响野生动物贸易、野生动物消费行为和消费心理的因素,明确了消费者行为的改变策略和未来的研究方向。

Copyright of Laser Technology is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Research of Soil & Water Conservation is the property of Institute of Soil & Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of Vibration, Measurement & Diagnosis is the property of Nanjing Hangkong Daxue and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of Hebei University of Science & Technology is the property of Hebei University of Science & Technology, Journal of Hebei University of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Science Research & Application is the property of Omniscient Pte. Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Chinese Journal of High Pressure Physics is the property of Chinese Journal of High Pressure Physics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Food Science & Technology & Economy is the property of Grain Science & Technology & Economy Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION ENGINEERING and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Modern Medicine & Health is the property of Journal of Modern Medicine & Health and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To investigate the short-term mortality of transcatheter arterial chemoembolization(TACE) in patients with primary liver cancer, and explore the possible causes of death and countermeasures. Methods All patients who underwent TACE at the Department of Interventional Radiology, First Affiliated Hospital of Soochow University from January 2015 to December 2020 were studied, but those with metastatic liver cancer or receiving combined treatment were excluded. The clinical and imaging data of all patients were collected before and 30 days after TACE, and the clinical characteristics of the patients with short-term postoperative death were analyzed. Death within 30 days after TACE was defined as short-term death. Results A total of 1466 TACE in 741 patients with primary liver cancer were included. Ten patients(10/741, 1.35%) died within 30 days after TACE, with a mortality rate of 0.68% for all TACE. The mortality rate of d-TACE and c-TACE was 1.62%(3/185) and 0.55 %(7/1281), respectively. The mortality rates of patients at China Liver Cancer Staging Ⅰ, Ⅱ, and Ⅲ stages were 0.45%(2/448), 0.33%(2/599), and 1.43%(6/419), respectively. The mean diameter of the largest lesion in death cases was 10.1±0.8 cm. The possible causes of death were liver failure(4 cases), rupture bleeding(3 cases), myelotoxicity(1 case), pulmonary embolism(1 case), and heart failure(1 case). Conclusion The mortality rate after TACE in patients with primary liver cancer is low, with occasional short-term postoperative deaths. The death cases are characterized by a large tumor volume, and the most common causes of short-term death are liver failure and rupture bleeding. [ABSTRACT FROM AUTHOR]

Copyright of Ordnance Industry Automation is the property of Editorial Board for Ordnance Industry Automation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Basic Sciences Journal of Textile Universities / Fangzhi Gaoxiao Jichu Kexue Xuebao is the property of Basic Sciences Journal of Textile Universities and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Acta Agronomica Sinica is the property of Crop Science Society of China and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electric Power Automation Equipment / Dianli Zidonghua Shebei is the property of Electric Power Automation Equipment Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Aiming at the problem of improving the performance of electromagnet components in thread cartridge solenoid valve, taking an electromagnetic directional valve as an example, the main structure affecting the magnetic circuit was analyzed and improved. By using the principle of magnetic circuit, the structural factors which affected the magnetic circuit and suction characteristics were analyzed. The Maxwell finite clement analysis modd of the valve was established. Based on the model, the influence of coil shell thickness, magnetic breaking thickness, armature angle and magnetic ring on the electromagnetic suction characteristics were simulated. The influence of each structural parameter on the suction of the maximum working air gap m1d stroke force curve was mainly analyzed. According to the simulation results, each structural parameter w,L~ analyzed and improved ., and a comprehensive improved model was proposed. The results indicate that the comprehensive model improves the suction charm, teristics of the electromagnet in thread cartridge solenoid valve, not only increases the suction at the maximum working air gap by about 30%,, hut also reduces the suction at the closing position by ahem! 50%·, which improves the phenomenon of rapid increase of suction during dosing, makes the reversing process of the directional valve more stable, and better meets the working requirements of the directional valve. [ABSTRACT FROM AUTHOR]

Copyright of Yellow River is the property of Editorial Board of Yellow River and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

BACKGROUND: Osteonecrosis of the femoral head is a common disabling disease in orthopedics. The development of the disease is difficult to be reversed, and improper treatment methods can easily lead to the collapse of the femoral head, leading to the partial or complete loss of hip function, which seriously affects the life of patients. OBJECTIVE: To summarize the methods of collapse assessment and prediction, and to propose that the combination of them can provide more accurate evidence for the selection of treatment. METHODS: PubMed was searched with the key words of “staging and classification, ONFH, collapse prediction, assessment”. CNKI and Wanfang database were retrieved using the key words of “staging classification, femoral head necrosis, collapse prediction”. The search time was from January 1991 to January 2020. Articles unrelated with the research and repetitive one were excluded, and finally 62 articles met the criteria for review. RESULTS AND CONCLUSION: (1) The classification and staging of osteonecrosis of the femoral head can effectively evaluate the existence and degree of collapse, but still have their limitation on prediction of collapse occurrence. (2) The combined application of collapse prediction method can improve the accuracy of the evaluation. The specific combination effect still needs further studies. [ABSTRACT FROM AUTHOR]

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Surfactant Detergent & Cosmetics (1001-1803) is the property of China Surfactant Detergent & Cosmetics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In view of the use of Floyd-Warshall algorithm, the large-scale ontology evaluation had higher time complexity and higher space complexity and didn't consider the association between versions in the ontology evolution process, this paper proposed the calculation of the ripple effect optimized by the SPF A ( shortest path faster algorithm) algorithm based on the adjacency list. The algorithm not only had the advantage of computational efficiency in large-scale ontology calculation, but also could simplify the calculation process of the ripple effect in the iterative process. The experimental results show that the SPFA has a certain time advantage in calculating the ontology ripple effect compared with the adjacency matrix based method, and this advantage gradually increases with time. In the ontology evolution ripple effect calculation time, the calculation time of the evolved version is about the original method, which proves the effectiveness of the optimization calculation. [ABSTRACT FROM AUTHOR]

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)