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文章对光纤拉曼放大器系统应用于NZ-DSF（非零色散位移光纤）中存在的泵浦与噪声之间的FWM（四波混频）现象进行了理论分析和实验证明。在理论分析中推断出第4束光出现的位置,并且在实验中加以证明。由此基础上提出,在光纤拉曼放大器系统中应用NZ-DSF时,泵浦波长应当远离零色散位移点,避免FWM效应的产生。

Since the 21st century, Japan's economy has been in a downturn, but its outward foreign direct investment has shown a growing trend, and its spatial pattern and its relationship with Japanese exports have also shown different characteristics from those of the 1990s. This article analyzed the global pattern of Japan's outward foreign direct investment since the 21st century based on the flow and stock data of Japan's outward foreign direct investment; and took three main regions of Japanese OFDI destinations as examples, this article conducted a Granger causality test on the relationship between Japan's OFDI and its exports. The results are as follows: ①From 2000 to 2022, the global pattern of Japan's OFDI underwent three stages: "Asia rising and Europe falling", "Europe and America rebounding and Asia stabilizing", and "North America rising and Europe Asia falling"; The U. S. had been the biggest destination in attracting Japanese OFDI; China's Japanese OFDI had experienced fast increase for nearly twenty years, but its increase rate had slowed down; ② Granger causality test shows that there are regional differences between Japan's outward foreign direct investment and its exports: Japan's direct investment in East Asia and Southeast Asia has a promoting effect on its exports; Japan's direct investment in Europe has a substitute effect on its exports; There is no causal relationship between direct investment in North America and Japan's export to this region; ③ The differences in industrial structure of Japan's direct investment in the three major regions and the procurement sources of Japanese overseas enterprises in the three regions can explain the differences in the Granger causality test in the three regions. The study of the relationship between Japan's outward foreign direct investment and export trade can provide reference for China to formulate outward foreign direct investment policies. [ABSTRACT FROM AUTHOR]

本文针对ZJ118卷烟机MAX在线喷胶系统的水位控制问题进行了详细的分析和改进. 由于水位控制单元 的先天设计缺陷, 导致生产过程中出现多种问题, 如停机后水位过高、长时间停机导致的水渍问题以及水位过低引起 的喷胶头堵塞. 为解决这些问题, 提出了一系列操作方法, 包括同步观察、及时排水、设备清理和注水等措施. 通过 这些改进, 设备运行效率得到提升, 停机时间减少, 产量增加, 同时保证了产品质量. 此外, 通过班组间的沟通和操 作方法的分享, 提高了整体的操作水平和对品质的追求. [ABSTRACT FROM AUTHOR]

In order to study the influence of temperature change on the strength and deformation of silty clay in natural state and saturated state, the silty clay widely distributed in typical seasonal frozen area was taken as the research object. The triaxial test of unsaturated soil in natural state and saturated silty clay under different temperature conditions was carried out by global digital system (GDS) unsaturated soil triaxial test system and GDS temperature-controlled static / dynamic triaxial test system. The experimental results show that the stress-strain curves of unsaturated and saturated silty clay show the characteristics of strain hardening. The cohesion of unsaturated silty clay increases with the decrease of temperature, while the internal friction angle decreases with the decrease of temperature, but the overall change trend is small. The cohesive force of saturated soil is the same as that of unsaturated soil. With the decrease of temperature, the cohesive force increases gradually, but the cohesive force is smaller than that of unsaturated soil at the same temperature, and the internal friction angle decreases first and then increases. When there is no vertical pressure, the axial deformation of unsaturated and saturated silty clay increases with the decrease of temperature under the same confining pressure, and the axial deformation of both decreases with the increase of confining pressure under the same temperature. The test results can provide theoretical basis for the design and construction of silty clay stratum engineering in seasonal frozen area. [ABSTRACT FROM AUTHOR]

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