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文章提出了一种利用偏振移位键控（PolSK）信号光,基于半导体光放大器（SOA）中的四波混频（FWM）效应的超快全光比较器方案。该方案由于采用了功率恒定的PolSK信号光,可以消除SOA中的码型效应。通过数值模拟,研究了两输入信号光功率、SOA注入电流以及有源区长度对超快全光比较器输出特性的影响。

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Taking the school-local cooperation of the agricultural major of Yichun University to service rural revitalization as the starting point, with the cultivation of innovation and entrepreneurship ability of undergraduate students in agriculture major as the research object, the measures were taken such as clarifying the purpose of innovation and entrepreneurship education in agriculture major, improving the curriculum system, strengthening the innovation and entrepreneurship ability construction of professional teaching staff, strengthening the operation mechanism construction of practical bases, and optimizing assessment indicators of practice innovation and entrepreneurship ability in agriculture major, to improve the innovation and entrepreneurship abilities of undergraduate students in agriculture major and formulate the cultivation model of agricultural undergraduates, so as to provide references for the reform of talent cultivation mode for undergraduate students in agriculture major. [ABSTRACT FROM AUTHOR]

Effects of straw returning with inorganic improver on the soil properties of coastal saline soils were assessed, and the improvement of saline-alkali soil quality was elucidated. Moderately saline soil originating from the Yellow River Delta was used as the experimental soil. The soil column test was used to study the effects of different straw-returning methods and their combination with inorganic improver on soil salinity and physicochemical properties. Straw mulching or tilling combined with inorganic improver promoted salt leaching and increased the total salt and salt ion contents in the leaching solution. Straw mulching and inorganic improver combined with straw mulching reduced salt content in the soil; the combination of straw and improver resulted in higher salt content in the leaching solution than straw mulching alone and inorganic improver alone. The soil salinity content was decreased in the soil layer from the surface to approximately 40 cm. The desalination rate was as high as 70.76%-83.94%, in soil of 0 cm to <20 cm,the soil organic matter increased by 10.96% and 11.96%, ammonium nitrogen increased by 23.77% and 24.01%, soil bulk weight decreased by 10.19% and 11.53%, percentage of water-stable agglomerates measuring 0.25 mm to <2 mm increased by 59.38% and 63.95%. In soil of 20 cm to <40 cm, the soil organic matter increased by 21.07% and 22.15%, ammonium nitrogen increased by 22.86% and 27.99%, soil bulk weight decreased by 7.20% and 8.13%, percentage of water-stable agglomerates measuring 0.25 mm to <2 mm increased by 39.54% and 32.67%. Straw mulching and tilling with the integrated use of inorganic improvers performed was effective for salt reduction and soil modification. The integrated strategy is the optimal modification technology to decrease soil salt and improve soil quality of coastal saline soils. [ABSTRACT FROM AUTHOR]

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Immobilization is an effective method to reduce the toxicity of heavy metals in soil. The ability of modified biochar to immobilize heavy metals has achieved remarkable results, and it has been widely a concern in soil remediation. However, the comprehensive mechanism of immobilizing heavy metals in contaminated soil by modified biochar needs further exploration. Therefore, CiteSpace data analysis software was used to analyze the mechanism of fixing heavy metals in soil by modified biochar・ Oxygernanionic heavy metals As and cationic heavy metals Cd were taken as examples to analyze the mechanism of immobilizing heavy metals in soil by modified biochar・ The mechanisms of redox, surface coprecipitation, complexation, ion exchange, and electrostatic attraction were reviewed・ The reasons and methods of different mechanisms of modified biochar enhancing immobilized soil heavy metal were summarized, and the prospect of its treatment of heavy metal pollution in soil was prospected, which provided a refierence for the application of modified biochar in the treatment of heavy metal pollution in soil. [ABSTRACT FROM AUTHOR]

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