Search

In order to analyze the mean random chord length of convex sets under different kinds of random processes, we take circles, equilateral triangles, rectangles, and squares as examples. Their mean values are obtained using definition method. Then the extreme values of the mean chord length of convex sets are discussed by means of the chord power integrals and their inequalities. Furthermore, some inequalities about these mean values are established, and two conjectures are proposed.(为研究在不同随机意义下平面凸域内的平均随机弦长问题，以圆域、正三角形域、矩形域、正方形域为例，用定义法得到这些凸域内的各平均随机弦长。用弦幂积分及其不等式，讨论了任意凸域内5种平均随机弦长的极值问题，并建立了相应的不等式。在此基础上，提出了2个猜想。)

为研究轴对称凸域的包含测度，以等腰梯形域为例，采用直线的广义法式方程，给出了等腰梯形域的广义支持函数与限弦函数的解析式。采用限弦函数法，得到了等腰梯形域的包含测度，并取消了“等腰梯形的高不超过梯形的最短底边长”这一限制条件。

Copyright of Journal of Silk is the property of Zhejiang Sci-Tech University Magazines 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 Food Safety & Quality is the property of Journal of Food Safety & Quality 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 Anhui Agricultural Sciences is the property of Journal of Anhui Agricultural Sciences 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 Anhui Agricultural Sciences is the property of Journal of Anhui Agricultural Sciences 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 Kunming Medical University / Kunming Yike Daxue Xuebao is the property of Kunming Medical Journal 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 Xinjiang Agricultural Sciences is the property of Xinjiang Agricultural Sciences 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 Shipin Kexue/ Food Science is the property of Food Science 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 Coal Science & Technology (0253-2336) is the property of Coal 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 Chinese Journal of Geological Hazard & Control is the property of China Institute of Geological Environmental Monitoring (CIGEM) 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.)

In order to ensure the subsequent stability of the composite repaired structure, it is required to use nonlinear ultrasonic Lamb wave to detect the health of the repaired area. Experimental and simulation studies of tensile damage in composite plate before and after adhesively-bonded repaired composite plates were conducted using nonlinear ultrasonic Lamb wave higher harmonic response technique. Finite element modeling was performed by ABAQUS software, the Hashin criterion was used to predict the tensile damage evolution of the matrix, and a smoothing analysis step was introduced in the tensile process. Finally, the propagation process of Lamb wave was simulated by applying displacement loads. On the basis of experimental verification of the feasibility of the simulation model, the relationship between higher harmonic response of nonlinear Lamb wave and tensile displacement, as well as the influence of different tensile damage degrees on the nonlinear parameters were investigated. The results show that compared with the unrepaired structure, the damage area, the second and third nonlinearity parameters in the adhesively-bonded repaired structure after stretching are significantly reduced. It indicates that this method can evaluate the effectiveness of engineering adhesively-bonded repair. With the increase of the tensile displacement, the second and third harmonic amplitudes and nonlinearity parameters first increase and then decrease, and reach the maximum at the tensile displacement of 1 mm. The nonlinear Lamb wave high order harmonic technology can effectively predict the tensile damage of composite before and after repair. [ABSTRACT FROM AUTHOR]

Copyright of Acta Geoscientica Sinica is the property of Acta Geoscientica Sinica 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 Acta Geoscientica Sinica is the property of Acta Geoscientica Sinica 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 Storage & Process is the property of Tianjin Academy 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.)

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.)

To determine the reasonable stope structural parameters for the sublevel drilling stage open stope and subsequent filling mining method in Hongling Lead Zinc Mine, numerical simulation was employed to study 16 different scenarios with roof thicknesses of 3 m, 5 m, 7 m, and 10 m, and stope lengths of 20 m, 30 m, 40 m, and 60 m, respectively. The stress, displacement, and plastic zone distribution of each scenario with a roof thickness of 3 m were compared. The results indicate that the stability of the stope in Hongling Lead Zine Mine is fairly good when the roof thickness is 3 m and the stope length is 35 m for the sublevel drilling stage open stope and subsequent filling mining method. [ABSTRACT FROM AUTHOR]

Copyright of Fire Safety Science is the property of Fire Safety Science 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 Fire Safety Science is the property of Fire Safety Science 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 Storage & Process is the property of Tianjin Academy 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.)

Copyright of Journal of Zhejiang University (Science Edition) is the property of Journal of Zhejiang University (Science Edition) 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 New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials 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 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 Coal Geology & Exploration is the property of Xian Research Institute of China Coal Research Institute 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.)

针对远距离的激光接收对准问题，文章提出利用大面积雪崩光电二极管的激光网桥系统，用作广域网的延长以及局域网之间的连接。激光网桥系统的软件需要一台计算机作为服务器进行信息处理，硬件连接是经过交换机及电光转换，通过放置在两幢楼的两台双向激光镜头进行发射接收。这个系统采用1 550 nm的近红外光，两幢大楼之间的距离约为1 km，而激光在这个条件下的几何损耗约为26 dB/km，调节两台激光器的相对位置直到两幢大楼接收的光功率在-30 dBm以内时，成功达到了两端视频通信所需的阈值光功率，因而可以进行双向视频通信。

Agriculture has played a vital role in the development of the national economy and social stability. However, there is ever-increasing pressure on agricultural production, due to the rapid growth of population and urbanization. Chemical fertilizers, antibiotics, and feeds have also been widely used to cause serious pollution in large-scale production. Furthermore, the competition between humans and animals for grain resources (such as corn and soybeans) has increasingly come to the forefront under the rapid advancements in the livestock and poultry industry. Additionally, the fish meal can serve as a vital component in the protein and essential nutrients in aquatic feeds. Yet some challenges have posed sufficient production and safety concerns in aquaculture. Thus, new technologies are very necessary to support sustainable agriculture. Among them, microalgae have been widely used to assimilate pollutants (such as nitrogen and phosphorus), as well as contain some nutrients and bioactive substances that promote the growth of animals and plants, and the quality of agricultural products. This review aims to first summarize the current applications of microalgae and its biochar in the planting industry. Some nutrients were slowly released to enhance the physical and chemical properties of the soil, thus facilitating plant growth. Additionally, the bioactive substances derived from microalgae were used to mitigate the threats from the biotic and abiotic factors to crops, which was also used to directly stimulate plant growth and metabolism. Secondly, the recent advancements were summarized on the microalgae for livestock wastewater treatment and feed additives. Both pollutant removal and nutrient recovery were effectively achieved by utilizing the microalgae in the treatment of livestock and poultry wastewater. However, further investigations were necessary to enhance the economic viability and practicality of microalgae-based livestock and poultry wastewater treatment. The efficiency of microalgae was also enhanced to remove the pollutants from undiluted livestock and poultry wastewater. Microalgae also served as an exceptional feed additive, providing a wealth of benefits for livestock and poultry. Abundant reserves were offered for the proteins, polysaccharides, dietary fibers, and vitamins. Microalgae were also incorporated into the diets of ruminant animals, pigs, and poultry, in order to enhance the immune systems, intestinal microbial communities, and ultimately growth. Moreover, the inclusion of microalgae as a feed additive also significantly promoted the nutritional value of their products in the livestock and poultry industry. This review also provided a comprehensive overview of the research progress on the application of microalgae in aquaculture. A similar role of microalgae was achieved in aquaculture and livestock and poultry industries. In terms of agriculture wastewater treatment, the combination of bacteria and microalgae (known as the bacterial-algal symbiotic system) showed great potential for future application. Furthermore, some techniques were required to detoxify the harmful microalgae, in order to reduce the bioaccumulation of pollutants in microalgae for the safety of microalgae feed additives. Additionally, it was very necessary to evaluate the toxic behaviors of wastewater and flue gas-cultured microalgae. Furthermore, the microalgae was applied to yield significant environmental and economic benefits, according to the life cycle assessment and techno-economic analysis. Future research should be given to optimize the cultivation mode of microalgae, in order to improve their efficiency in pollutant removal and harvesting cost saving. Moreover, it is also important to clarify the toxic effects of various pollutants on microalgae and their subsequent utilization. Additionally, systematic evaluations should be conducted on the economic viability and sustainability of microalgae in agricultural applications. The finding can also provide a theoretical basis for the large-scale application of microalgae in sustainable agriculture. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Kunming Medical University / Kunming Yike Daxue Xuebao is the property of Kunming Medical Journal 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 Modern Preventive Medicine is the property of Modern Preventive 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.)

【Objective】Functional strains with multiple biological activities were excavated from the forest rhizosphere soil of Wuliangshan National Nature Reserve, and their potential for development and application was explored.【Method】The 25 rhizosphere soil samples from different regions and plants in Wuliangshan National Nature Reserve were collected. The active strains with functions such as phosphate dissolution, nitrogen fixation, zinc dissolution, and antibacterial activity were isolated and identified using selective culture medium. The biological activities of these strains, such as secreted siderophore, ACC deaminase, and indoleacetic acid, were tested while verifying their effectiveness in promoting tomato seed germination and plant growth.【Result】70 phosphorus-dissolving bacteria, 27 nitrogen-fixing bacteria, 8 potassium-dissolving bacteria, and 51 antibacterial bacteria were isolated and identified. Among them, YIM B08401 and YIM B08402 were identified as Burkholderia alba and Pseudomonas qingdaonensis based on morphological, physiological, biochemical characteristics, and 16S rDNA sequencing. The two strains both had the activities of phosphate lysis, nitrogen fixation, zinc lysis and siderophore secretion. Their maximum soluble phosphorus content was（455.63±59.65）mg/L and（878.95±64.78）mg/L. The results of seed germination promotion tests of the two strains were similar, and the germination rates of the two strains were maintained at 82%-93% after applying the fermentation supernatant diluted 10 times, 102 times and 103 times, which was significantly higher than 56% and 49% in the control group. The length of the treatment group with the fermentation liquid of the strain significantly increased compared with the blank control group. Pot experiment showed that the above ground length, fresh weight, dry weight, stem diameter, root length, fresh weight and dry weight of the two strains in the treatment group with the most obvious growth promotion effect were significantly better than that in the control group. Compared with the control group, the above indexes of YIM B08401 significantly increased by 89%, 495%, 268%, 62%, 53%, 385% and 469%, and the above indexes of YIM B08402 significantly increased by 118%, 528% and 477%, 55%, 37%, 413% and 747%, respectively. In addition, strain YIM B08401 also had activities of antagonizing pathogenic bacteria and secreting ACC deaminase, and YIM B08402 also had the activity of secreting indoleacetic acid. 【Conclusion】The rhizosphere soil in the forest of Wuliang National Nature Reserves contained a variety of strains with biological activity. B. alba YIM B08401 and P. qingdaonensis YIM B08402 demonstrates the potential for the development and application of new microbial fertilizers [ABSTRACT FROM AUTHOR]

[Objective] The aims are to study the characteristics of precipitation, runoff and sediment transport in typical tributaries of Kongdui, quantify the impact of climate change and human activities on water and sediment changes, so as to reveal the driving mechanism of water and sediment evolution in Kongdui area, and to explore the reasons for the reduction of sediment transferring to Yellow River through Kongdui. [Methods] Based on annual precipitation, runoff and sediment discharge data from 1980 to 2018 in the Hantaichuan Basin, a typical tributary of the 10 Kongdui in the Yellow River Basin, the causes of water and sediment changes were investigated by means of linear trend method, Mann-Kendall trend test, Pettitt catastrophe test and double accumulation curve. [Results] Precipitation and runoff in Hantaichuan watershed showed a non-significant upward trend, while sediment discharge showed a significant downward trend (p＜0.05). The annual runoff and annual sediment discharge both changed abruptly in 1998. After the abrupt change, the annual average runoff decreased by 38.61% compared with that before the abrupt change, while the sediment discharge significantly decreased by 80.61% compared with that before the abrupt change. [Conclusion] Human activities are the main factors contributing to the decrease of runoff and sediment discharge in the Hantaichuan Basin, with the contribution rates of 60.38% and 59.73%, respectively, while the contribution rates of precipitation change are 39.62% and 40.27%, respectively. [ABSTRACT FROM AUTHOR]

Copyright of Command Control & Simulation / Zhihui Kongzhi yu Fangzhen is the property of Command Control & Simulation 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 Mine Automation is the property of Industry & Mine Automation 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 Food Safety & Quality is the property of Journal of Food Safety & Quality 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 the Chinese Society of Rare Earths is the property of Editorial Department of Journal of the Chinese Society of Rare Earths 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 Sichuan Mental Health is the property of Sichuan Mental Health 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.)

Copyright of Modern Food Science & Technology is the property of Editorial Office of Modern Food 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 Journal of Synthetic Crystals is the property of Journal of Synthetic Crystals 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 Brewing is the property of China Brewing 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 Research & Development is the property of Food Research & Development 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 Food Research & Development is the property of Food Research & Development 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 Food & Machinery is the property of Food & Machinery 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.)