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Copyright of Acta Edulis Fungi is the property of Acta Edulis Fungi 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 Chemical Engineering (China) / Huaxue Gongcheng is the property of Hualu Engineering Science & Technology Co 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.)

Copyright of Journal of Beijing University of Technology is the property of Journal of Beijing University of Technology, Editorial Department 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 Beijing University of Technology is the property of Journal of Beijing University of Technology, Editorial Department 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] The aim of this study is to clarify the temporal and spatial status of ecological environment quality and the main driving factors of its evolution under the continuous promotion of urbanization in Shandong Province, which is of great importance for recognizing the status quo of ecological environment in Shandong Province and formulating reliable protection strategies and systems in the later stage. [Methods] Based on remote sensing ecological index: a comprehensive index from 1991 to 2021, with the help of Sen trend method, coefficient of variation method, Hurst index method and geographical detector, the characteristics and driving factors of ecological environment quality change in Shandong Province were explored. [Results] (1) From 1991 to 2000, the ecological environment quality in Shandong Province showed the decreasing trend and the change was relatively stable. From 2001 to 2010, RSEI showed the increasing trend, mainly stable change trend. From 2011 to 2021, RSEI changes in most areas showed the stable state, and RSEI in woodland and cultivated land areas showed the increasing trend, while other land use types showed the decreasing trend. (2) RSEI will mainly increase in the future period, and the change trend of different land use types in the future period is opposite to that in the past 31 years. (3) Land use change had the greatest impact on the spatial distribution of RSEI in Shandong Province during 1990—2000 and 2001—2010, and the spatial distribution of RSEI during 2011—2021 was greatly affected by humidity change and land use change, and the interaction between land use and other factors had a greater impact on RSEI. [Conclusion] There are significant differences in the sensitivity of ecological environment quality to environmental factors at different periods in Shandong Province, which is caused by the differences in the intensity and mode of human activities in different regions and the vulnerability of ecological environment in different regions. The visual expression of ecological environment quality can reflect the temporal and spatial evolution characteristics of ecological environment quality, and provide important reference information for the decision making of maintaining human-ecological environment balance. [ABSTRACT FROM AUTHOR]

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department 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 Southeast University / Dongnan Daxue Xuebao is the property of Journal of Southeast University 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 Urban Architecture & Development 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.)

Copyright of Atomic Energy Science & Technology is the property of Editorial Board of Atomic Energy 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 Biomass Chemical Engineering is the property of Editorial Office of Biomass Chemical 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 Irrigation & Drainage is the property of Journal of Irrigation & Drainage 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 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.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of 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.)

At present, the state has issued a series of policies to encourage and support migrant workers to return to their hometowns to find jobs or start businesses. The situation of migrant workers returning to their hometowns for employment and entrepreneurship is improving, but there are still many problems. Based on 56 questionnaires collected from 9 cities in Hebei Province in July 2021, this paper analyzes the basic situation and employment situation of returnees, and explores their employment choices and influencing factors after returning to their hometowns. The study finds that the returnees are mostly engaged in agriculture, service industry and manufacturing, and their employment and entrepreneurship choices are mostly influenced by migrant work experience. Their human capital, family factors, capital constraints, and policy support for entrepreneurship and employment also affect their choice of entrepreneurship and employment. According to the research results, this paper puts forward some policy suggestions to promote the employment and entrepreneurship of returnees, such as increasing skills training, developing rural industries, lowering the financing threshold and increasing policy support. [ABSTRACT FROM AUTHOR]

The experiment was to study the effect of artificial combined diet and fresh diet on growth performance, muscle nutrient composition and digestive enzyme activity of Siniperca chuatsi. A total of 6 000 Siniperca chuatsi with an average body weight of 42.90 g were randomly divided into two groups, with three replicates in each group and 1 000 Siniperca chuatsi in each replicate. Each group was fed artificial diet and fresh diet, respectively, for 200 d of culture comparative test. The results showed that there was no significant difference in weight gain rate, specific growth rate, fatness and hepatobody ratio between Siniperca chuatsi of artificial diet and fresh diet (P>0.05). There was no significant difference in moisture and protein contents of fish body (P>0.05). The ∑TAA content of fresh diet group was extremely higher than that of artificial diet group (P<0.01). The EAA/TAA of two groups were 36.41% and 37.20%, EAA/NEAA were 66.85% and 69.52%, respectively, which met FAO/WHO standards. According to AAS, Val was the first limiting amino acid in muscle of both groups. The first limiting amino acid was Met+Cys in muscle of both groups when evaluated by CS. The content of EPA and DHA in artificial diet group were extremely higher than those in fresh diet group (P<0.01). There was no significant difference in the activity of amylase and lipase in liver and intestine between two groups (P>0.05). The study indicates that Siniperca chuatsi with high nutritional value can be cultivated with both kinds of diets, different diets have no obvious effect on growth and digestive enzyme activitiy of Siniperca chuatsi. [ABSTRACT FROM AUTHOR]

In order to improve the efficiency of water and fertilizer, and guide the scientific watering and fertilization of the poplar, using Populus deltoides Bartr. Huashi 2 as the material, the growth and photosynthetic characteristics were compared and analyzed in different water gradient and fertilizer amount. The two-factor analysis of variance of water and fertilization showed significant difference in seedling height and ground diameter between different soil water (P<0.05), significant difference in ground diameter between different fertilizer amount (P<0.05), but no significant difference in seedling height. The growth of A4B4 was the worst, and the growth of A2B2 was the best. No matter different fertilizer amount or soil water, the numbers of leaves were significantly different (P<0.05), the numbers of leaves in A4B1 were the least, the mean value was 17.67, while the numbers of leaves in A1B2 were the largest, with an average value of 39.00. It was found that the treatments with lower chlorophyll content were mainly those with less fertilizer amount (B4), while the treatments with higher chlorophyll content were mainly those with higher fertilizer amount (B1,B2). The maximum light saturation point (PLS) was A1B1(1961.59 μmol·m-2·s-1), and the maximum net photosynthetic rate (Pnmax) of A2B1 was the highest (24.75 μmol·m-2·s-1). There was no significant difference and regularity about the light compensation point (PLC) and dark respiration rate (Rd). To improve the quality of poplar seedlings, water and fertilizer were not the more the better. Keeping soil water as 80%-85% of field water holding capacity and applying compound fertilizer 15 g with one plant from May to July could effectively increase the number of leaves, enhance the ability of leaf to adapt to strong light and photosynthetic potential, and enhance the growth advantage. [ABSTRACT FROM AUTHOR]

Copyright of Qing History Journal is the property of Renmin University of China, Institute of Qing History 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.)

针对无人机组网通信的需求,利用MIMO（多输入多输出）技术可以获得分集增益、提高通信质量的优势,构建了一个无人机协作通信系统模型。提出了一种解决MIMO协作传输的组簇算法,对通信传输过程的信干噪比情况进行了理论分析,得知协作传输相比单节点传输可以有效提高信干噪比。在构建的模型下进行了仿真,验证了分析结果的正确性。同时对组簇算法中嵌入的同步技术进行了仿真,可以有效地解决码间串扰问题。

针对Ad Hoc网络中的节点位置估计和路由控制问题,在基于OLSR（最优链路状态路由）协议的基础上提出了一种能够同时实现路由和定位的综合协议OLSR-P（最优链路状态路由和定位）。该协议对OLSR协议进行了改进,能够将路由开销和定位有效结合,并对数据包结构进行改良,利用原协议的路由开销实现定位。仿真实验结果表明:OLSR-P协议不仅能够同时实现路由和定位,还能有效地控制开销。

Copyright of China Tropical Medicine is the property of China Tropical Medicine 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 Journal of International Obstetrics & Gynecology is the property of TianJin Medical Information Center 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.)

Urbanization is the carrier of urban informal economy development and one of the important factors affecting informal employment. This paper adopts the inter-provincial panel data from 2006 to 2017, and uses the adjacent-matrix and geographical distance matrix to con‐ struct the Spatial Durbin Model (SDM), and empirically analyzes the impact of urbanization de‐ velopment on informal employment and its mechanism. It is found that urbanization can signifi‐ cantly promote informal employment through direct effect and spatial spillover effect. Among them, the direct effect mainly through agglomeration effect, space effect and investment effect to directly promote the informal employment in the region. At the same time, the urbanization development of synergies between neighborhood, which makes the regional urbanization devel‐ opment of informal employment has a significant positive spillover effects. Compared with the border region, the spillover effect of geographically close regions is stronger. Further research shows that government competition between provinces plays a strong mediating role in the spa‐ tial spillover effect of urbanization development on informal employment and is an important factor that produces such spatial spillover effect. [ABSTRACT FROM AUTHOR]

Copyright of Acta Edulis Fungi is the property of Acta Edulis Fungi 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 Acta Edulis Fungi is the property of Acta Edulis Fungi 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.)

Copyright of Feed Research is the property of Editorial Board of Feed Research 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.)

目的 探讨2型糖尿病患者并发微血管病变与血管内皮功能及血压的相关性。方法　选取2型糖尿病患 者92例，根据是否并发微血管病变分为单纯2型糖尿病组 (对照组) 45例和2型糖尿病合并微血管病变组 (观察组) 47例。测定两组血管循环内皮细胞 (CEC) 数量和血清内皮素-1 (ET-1) 水平、肱动脉血流介导性舒张率 (FMD) 及平 均动脉压 (MAP) 。观察组给予苯磺酸左旋氨氯地平片治疗24周，比较治疗前后患者CEC、ET-1、MAP及FMD变化。 采用 Pearson相关分析法分析微血管病变指标与内皮功能及血压的相关性。结果 观察组 CEC、ET-1及 MAP均高 于对照组，FMD低于对照组 (P均<0. 05); 观察组给予苯磺酸左旋氨氯地平片治疗24周后，患者CEC、ET-1及MAP水 平下降，FMD 水平上升 (P 均<0. 05) 。CEC、ET-1 与 FMD 呈负相关 (r 分别为－0. 413、－0. 486，P 均<0. 05) ，与 MAP 呈正相关 (r分别为0. 507、0. 516，P均<0. 05) 。结论　血管内皮功能受损及血压升高与2型糖尿病并发微血管病变 存在明显的相关性，二者共同参与2型糖尿病患者并发微血管病变的发生及发展。 [ABSTRACT FROM AUTHOR]

To enhance the performance of image classification and improve the accuracy and efficiency of copy detection, this paper proposed an image hash algorithm based on QBFM moments and three-dimensional structure. Firstly, it used normalization to process the color image, and obtained the Gaussian fusion image and Laplace fusion image through multi-scale fusion, then extracted the QBFM features of two fusion images. At the same time, it directly extracted gradient information of the Gaus-sian fusion image in the RGB color space and constructed a three-dimensional model, used the concave convex point information of peak and valley curve of gradient from different perspectives to obtain the three-dimensional local structure features. Then, it disposed the three-dimensional model of gradient image by equidistant segmentation, Counted the number of pixels and variance of each section as the three-dimensional global structure features. Finally, it combined the QBFM features and three-dimensional features of the image and scrambled to form the final hash sequence. Experimental results show that the algorithm has a better balance between robustness and discrimination. Compared with the existing hash algorithms, it has good image classification performance. In the copy detection experiment, the algorithm has the best recall and precision. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Physical Education / Tiyu Xuekan is the property of Journal of Physical Education 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 Journal of Shaanxi University of Science & Technology is the property of Journal of Shaanxi University of Science & Technology Editorial Department 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.)