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目的了解后新冠疫情时代背景下疾病预防控制机构工作人员离职意愿现状并探讨其离职意愿的影响因素，为维护我国疾病预防控制机构人才队伍的稳定以及促进卫生健康事业稳步发展提供政策建议和参考依据。方法采用“问卷星”电子问卷的方式，于2023年1~2月，对1 508名深圳市疾病预防控制机构工作人员进行问卷调查。通过Logistic逐步回归分析方法，分析疾病预防控制机构工作人员离职意愿的影响因素。结果1 508名调查对象中有离职意愿的工作人员为583人（38.66%）。Logistic逐步回归分析结果显示，工作安排、薪酬水平、职称晋升制度、职业意志、工作前景担忧的得分情况与离职意愿的产生有关联［OR 95%CI分别为：0.783（0.643，0.952）；0.531（0.452，0.623）；0.738（0.614，0.887）；0.605（0.520，0.703）；0.614（0.529，0.714）］，此外职称、年龄、学历也都与离职意愿的产生有关联，P

为使滇西北送广东±800 kV特高压直流输变电工程投运后尽快满送功率，在送端电厂机组长期处于开机量较小的情况下，需云南主网增加外送滇西北直流功率。针对送端小开机方式下直流被动进入孤岛后的系统过电压展开了风险分析，提出了提升直流输送能力的过电压抑制措施并进行了现场调试验证。计算表明：若以传统的过电压保护策略，送端电厂开2机和5机情况下直流输送功率极限分别为1500 MW和3300 MW；采取直流被动进入孤岛后采用先全切交流滤波器组、切断成功后延时闭锁直流的过电压抑制措施后，可以将直流输能力提升至额定功率，并使系统过电压水平满足要求。

针对光伏逆变器并网电流谐波较大的问题，首先对三电平逆变器的主电路结构进行了分析，得出了网侧输出电流的数学模型，并分析了该模型下逆变器谐波产生的机理。在分析了传统的PI+重复控制的基础上，针对传统PI与重复控制相互耦合容易导致等效重复控制对象不稳定的问题，提出了一种双PI+重复控制（double proportional integral + repetitive control，DPI+RC）的控制策略。采用PI补偿，在保证了传统PI+重复控制系统跟踪的快速性和准确性前提下，确保了系统的稳定性。最后，通过仿真和试验分析，验证了该控制策略对谐波抑制的有效性和可行性。

以一维 EQC码为例 ,研究了“不同时片不同波长”的二维码字结构的特点 ,分析了实现这种二维码字编码的光纤光栅编解码技术及其特点 ,并叙述了实现这种 OCDMA系统的星形拓扑结构

目的　观察早产儿出生时及1月龄时骨代谢标志物、营养评价指标、生长发育评价指标水平变化，并分析 其相关性。方法 257例新生儿根据胎龄分为极早产儿组 (36例)、晚期早产儿组 (73例)、足月儿组 (148例)，比较各 组骨代谢标志物｛血清25-羟维生素D［3 25 (OH)D3 ］、钙、磷、碱性磷酸酶 (ALP)、骨特异性碱性磷酸酶 (BAP)、甲状旁 腺激素 (PTH)｝、营养评价指标［血清球蛋白、白蛋白、前白蛋白］、生长发育评价指标［身长、体质量、头围］水平，分析 早产儿1月龄时骨代谢标志物、营养评价指标变化与生长发育评价指标增长的相关性。结果　与同组出生时比较， 3组1月龄时血清钙、磷、25 (OH)D3水平升高，血清ALP、BAP、PTH水平降低 (P均<0. 05)；与足月儿组比较，其余两 组出生时和 1月龄时血清钙、磷、25 (OH)D3水平降低，血清 ALP、BAP、PTH水平升高 (P均<0. 05)；与晚期早产儿组 比较，极早产儿组出生时和 1 月龄时血清钙、磷、25 (OH)D3水平降低，血清 ALP、BAP、PTH 水平升高 (P 均<0. 05)。 与同组出生时比较，3组1月龄时血清球蛋白、白蛋白、前白蛋白水平升高 (P均<0. 05)；与足月儿组比较，其余两组 出生时和 1月龄时血清球蛋白、白蛋白、前白蛋白水平降低 (P均<0. 05)；与晚期早产儿组比较，极早产儿组出生时 和1月龄时血清球蛋白、白蛋白、前白蛋白水平降低 (P均<0. 05)。与同组出生时比较，3组1月龄时身长、体质量、头 围增加 (P均<0. 05)；与足月儿组比较，其余两组出生时和1月龄时身长、体质量、头围减少 (P均<0. 05)；与晚期早产 儿组比较，极早产儿组身长、体质量、头围减少 (P 均<0. 05)。血清钙升高与新生儿体质量增长速度呈正相关 (r= 0. 549，P<0. 05)；血清球蛋白、白蛋白、前白蛋白水平升高与新生儿身长增长、头围增长及体质量增长速度均呈正相 关 (r分别为0. 361、0. 389、0. 316；0. 302、0. 358、0. 385；0. 339、0. 371、0. 366，P均<0. 05)；血清BAP、PTH水平升高与 新生儿身长增长、体质量增长速度呈负相关 (r分别为－0. 486、－0. 237、－0. 515、－0. 287，P均<0. 05)。结论　早 产儿随胎龄、日龄的增加，身长、体质量、头围均呈增长趋势，血清钙、磷、25 (OH)D3、球蛋白、白蛋白、前白蛋白水平 呈递增趋势，血清ALP、BAP、PTH水平呈下降趋势；血清钙升高与新生儿体质量增长速度呈正相关，血清球蛋白、白 蛋白、前白蛋白水平升高与新生儿身长增长、头围增长及体质量增长速度均呈正相关，血清BAP、PTH水平升高与新 生儿身长增长、体质量增长速度呈负相关。早期监测早产儿血清骨代谢标志物及营养评价指标变化，并有针对性的 采取更科学完善的营养方案，对促进早产儿健康生长发育具有重要临床意义. [ABSTRACT FROM AUTHOR]

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Based on the demand for the construction of the “Four New Disciplines”, the multidisciplinary characteristics of Shandong University, and the development trend of cross-fertilization between chemistry majors and various disciplines, the Chemistry Experimental Teaching Center has constructed a comprehensive open and innovative chemistry experimental teaching system with multidisciplinary fusion. The center has also restructured its management framework and explored various aspects of laboratory construction and management, as well as the development of experimental technology teams. These efforts have yielded significant positive outcomes. [ABSTRACT FROM AUTHOR]

目的: 评估脑电图 (electroencephalogram, EEG)在心肺复苏 (cardiopulmonary resuscitation, CPR) 后昏迷患者早期 神经功能预后中的预测价值。 方法: 本研究前瞻性地收集了自2018 年1 月—2022 年12 月期间在首都医科大学宣武医院就诊的CPR后昏迷患者, 所有患者在CPR后48—72h 内接受床旁EEG监测。本研究将EEG结果分为6 种模式: 慢波增多模式 (有反应性或 无反应性), 三相波, 爆发抑制模式 (癫痫样放电或非癫痫样放电), α/β/θ/δ/纺锤波昏迷, 癫痫样放电 (局灶性或广泛 性)和全面抑制模式。预后随访采用6 个月内格拉斯哥-匹兹堡脑功能分级 (cerebral performance categories, CPC), 结果分为良好 (CPC 1—2)或不良 (CPC 3—5)。 结果: 本研究共纳入54 例患者, 其中女性29 例, 男性25 例, 预后良好20 例, 占37.04%。EEG分级预测CPR后昏迷患 者预后的ROC曲线下面积为0.798 (95% CI 0.675—0.921, P<0.01), 其中慢波增多与良好结局相关 (P<0.05)；爆发 抑制 (有癫痫样活动), 癫痫样放电 (局灶性和广泛性)、全面抑制模式与不良结局相关。 结论: EEG分级能够客观反映CPR后昏迷患者的脑损伤严重程度并且可能有助于临床早期预测这类重症患者的神 经功能预后。 [ABSTRACT FROM AUTHOR]

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This paper describes some of the problems in the teaching of organic chemistry laboratory, and introduces the exploration and practice of improving the teaching quality. In the decades, we have continuously innovated the teaching methods of organic chemistry laboratory from the aspects of strengthening students' preview, strengthening teachers' skill training, emphasizing the collective lesson preparation, strengthening the teachers' guidance of the experimental process, and strengthening the evaluation and reflection after class. [ABSTRACT FROM AUTHOR]

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Water quality monitoring is of great significance to maintaining human health, environmental protection and sustainable economic development. Much attention has also been drawn to water quality safety in recent years. Among them, the concentration of chlorophyll-a is one of the most important indicators of water quality in the fields of aquaculture, fishery management, and environmental protection. Multi-point deployment and continuous monitoring are then required to accurately assess the overall evolution of water quality in large-scale water areas. However, the current instruments of chlorophyll detection are limited for the implementation of large-scale water body monitoring, due to the high price and low degree of automation. In this study, a monitoring device was designed to detect the water chlorophyll-a concentration using laser-induced fluorescence technology. An ambient light correction and data processing were also proposed for the real-time monitoring of chlorophyll-a concentration. The laser light was emitted with a wavelength of 440 nm into the water body, in order to induce and excite chlorophyll-a for the fluorescence with a central wavelength of 680 nm. The concentration of chlorophyll-a was then monitored using the visible light sensor in the device, indicating the 680 nm fluorescence intensity excited by chlorophyll-a. There was a low overall manufacturing cost of the device. Low-power device design introduced the standby and serial port wake-up modes for online automatic monitoring. The two-way communication module was used to realize the data interaction. Data processing was evaluated to reduce the influence of the non-uniform distribution of chlorophyll-a in the water body on the measurement using statistical analysis. The mean value was calculated in time and space. A stable and accurate measurement was achieved in the instrument. An ambient light correction was proposed to reduce the impact of ambient light changes on the instrument measurement. A similar corrected value of the 680 nm light intensity was obtained in the water body chlorophyll-a with the same concentration under 6 groups of ambient light. Experiments show that this device effectively reduced the interference of ambient light on the measurement. The instrument stability test was carried out to observe the power supply circuit of the laser module and the 440 nm light intensity value, where the standard deviation coefficients were both 0.001 after 4 minutes, and the Pearson correlation coefficient was 0.84. It indicated that the laser output was controlled by the current intensity. A short time was obtained for the laser module power supply current to reach a stable state after precisely controlling the current, further reducing the overall power consumption of the instrument. 20 groups of water samples were configured with different chlorophyll-a concentrations using Chlorella chlorophyll in the instrument calibration test, referring to the range of chlorophyll-a concentration under different water bloom levels. The fitting model was established using the linear relationship between the fluorescence value at 680nm and the concentration of chlorophyll-a, where the coefficient of determination R² was 0.99. In the performance verification test, the green algae Chlorella and Microcystis aeruginosa were used to prepare 6 groups of water samples to be tested with different dominant algae species. The average measurement error of the instrument was within 5.48% under 2 groups of different light intensities. The test results show that the instrument performed stably to effectively detect the samples to be tested. There was no significant effect of the chlorophyll content in the water samples on the detection, due to the different types of algae, indicating the high detection accuracy. The finding can provide more convenient, cost-effective equipment support in the field of water quality monitoring, in order to realize all-weather monitoring chlorophyll-a concentration. [ABSTRACT FROM AUTHOR]

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A two-year phytoremediation demonstration project of slightly cadmium-contaminated farmland soil was carried out with two cropping systems, i.e., Amaranthus hypochondriacus monoculture and A.hypochondriacus-Bletilla erhizoma intercropping. The results showed that the equivalent yield of A.hypochondriacus was increased by 17.3% and the Cd concentration of each parts was reduced by 14.9% to 26.6% under the intercropping system, but there was no significant reduction in the phytoremediation efficiency; intercropping reduced the Cd concentration of the tuber of B.erhizoma by 29.5%, providing extra economic income during phytoremediation. Furthermore, a cost-benefit and popularization ability analysis over a ten-year lifetime was conducted. The benefits of intercropping would offset the total cost in 5 years.A.hypochondriacus-B.erhizoma intercropping system had more application and promotion value. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of Shenzhen University Science & Engineering is the property of Editorial Department of Journal of Shenzhen University Science & 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.)

[ObjectiveH The response characteristics of soil, crops and microorganisms at the fracture zone of the subsidence area was studied in order to provide a theoretical basis for ecological damage reduction and self-repair in the subsidence area. Methods] The coal mining subsidence area of Shendong was taken as the research site, the response characteristics of soil, crops and microorganisms at the fracture edge of the subsidence area within 1 5 days from LFC to LFW were studied by using field monitoring and indoor analysis. [Results] The surface soil moisture content within the depth of 10 cm was completely lost and could not be recovered after 3 days of subsidence and fracture generation, soil moisture was also affected within the depth of 20 cm, but not significantly. The development of fracture in the subsidence area had a disturbing effect on soil physicochemial indexes and enzyme activities, but it was not significant. The development of fracture in the subsidence area caused disturbance to soil microorganisms, which reduced the uniformity and relative abundance of soil microbial communities, the dominant phyla of bacteria with a relative abundance greater than 1 % were lacked of Armatimonadetes and Firmicutes, the dominant phyla of fungi with a relative abundance greater than 1 % was lacked of Blastocladiomycota. RDA analysis showed that soil T, ()M, AK, AI}, pH, and AN were the critical factors driving the changes of soil microbial community structure. Pearson correlation analysis showed that the crops at the fracture edge of the subsidence area were significantly stressed by soil water and temperature, and the contents of SS, SOD, SI〉and MAT) in the crops increased significantly, and the stress degree was corn >• cabbage > potato, Conclusion] Fracture development in the area of the subsidence is the source driver of the linkage response of soil environmental factors, microbial communities and crops in the fracture margin zone. [ABSTRACT FROM AUTHOR]