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风电场经柔性直流并网存在几赫兹至几百赫兹频率范围的振荡风险。首先，为复现宽频域振荡特征，基于频率扫描的测量方法，建立双馈风电场孤岛接入柔性直流的振荡分析模型。然后，采用网络阻尼稳定性判据并结合时域仿真，剖析互联系统在次/超同步频率范围和中高频范围的振荡机理。之后，考虑风机、柔性直流控制参数以及风速和并网风机台数的变化，分别针对次/超同步频段、中频段、高频段的振荡情况分析系统阻抗特性，利用阻抗聚合法量化评估各个影响因素与系统潜在振荡风险的关系，给出不同影响因素的变化对系统振荡频率的影响。最后，总结了双馈风电场经柔性直流并网系统在不同频段范围发生振荡的关键影响因素，为宽频域振荡控制提供指导思路。

柔性直流输电技术在大规模风电送出中应用越来越广泛，但存在因风电和柔直各自电力电子设备控制相互作用而引发系统振荡风险。首先，为从物理意义上解释振荡机理，以阻抗分析法为基础，推导基于等效电路阻尼的互联系统稳定性判据。然后，基于此判据和时域仿真结果，分析风机网侧变流器、锁相环和柔性直流换流器的控制带宽与振荡风险的关系，指出系统振荡频率随控制参数改变的变化规律。最后，分析风速和并网风机台数对风电经柔性直流送出系统的等效电路阻尼特性影响，提出振荡稳定性约束的控制参数设计要求。

This paper summarized the traditional Chinese Medicine nursing measures for a patient with lymphoedema of the lower limbs after radical hysterectomy for cervical cancer. Nurses had taken the comprehensive risk assessment, medication guidance and other routine nursing interventions. Based on the syndrome differentiation, Traditional Chinese Medicine nursing techniques including acupoint application, collateral-pricking and cupping treatment, in combination with interventions of improving microcirculation of limb tissues and skin hygiene, were carried out to relieve the edema of the lower limbs and improve the activity of daily living. (本文总结1例宫颈癌术后双下肢淋巴水肿患者的中医特色护理经验。基于辨证分型, 在完善护理评估、用药指导等常规护理的基础上, 采用穴位贴敷、刺络拔罐等中医特色护理措施, , 积极改善微循环, 加强皮肤护理, 减轻患者水肿程度, 促进患者日常活动能力恢复。)

This paper summarized the nursing experience in a case of chronic renal insufficiency treated with combination of Traditional Chinese Medicine (TCM) enema and Baduanjin exercise, mainly including nursing assessment, routine nursing, procedures of TCM enema and Baduanjin exercise, and matters need attention in the treatment. The combination treatment of TCM enema and Baduanjin exercise was effective to relieve the symptoms of constipation and fatigue. (本文总结中药灌肠联合健身八段锦治疗1例慢性肾功能不全患者的护理经验, 主要包括护理评估、常规护理、中药灌肠及八段锦操作方法和注意事项等, 通过开展中西医结合干预措施, 能够有效改善了患者便秘、乏力等症状。)

This paper summarized and analyzed the clinical efficacy of electric plum-blossom needle tapping and needling in the treatment of 1 case of juvenile mild myopia. Under the guidance of Traditional Chinese Medicine syndrome differentiation and nursing theory, electric plum-blossom needle tapping and needling was adopted. Interventions such as nutrition support and psychological care were carried out during the treatment, in order to improve the recovery of the patient with juvenile myopia. (本文总结1例采用电梅花针治疗轻度近视患者的护理经验, 基于中医辨证施护理论, 针对性取穴, 采取电梅花针叩刺治疗, 同时配合饮食、情志等护理措施, 能有效改善患儿视力。)

This paper summarized the nursing interventions for a child with Tourette's syndrome treated with intradermal acupuncture. Scientific assessment on disease and patient conditions was conducted before treatment. Under the guidance of TCM theory, intradermal acupuncture and TCM syndrome differentiation nursing were carried out. Routine nursing and emotional care were also performed to ensure the physiological and mental status of the patient. (本文总结1例运用皮内针治疗小儿多发性抽动症的护理经验。干预前需要科学评估患儿, 在中医理论的指导下, 基于中医辨证施护, 合理取穴进行皮内针治疗。同时还应做好患儿的一般护理和情志护理, 确保患儿保持良好的生理状态, 帮助患儿树立积极的治疗心态。)

Objective To analyze the effect of training for medical caregivers, and provide reference for the standard training for medical caregivers. Methods A training group was established to formulate the teaching and training program, teaching objectives, management requirements, training items, teaching conditions, training forms and assessment rules. The training program was carried out according to the implementation plan of Strengthening the Training and Standardized Management of Medical Care Worker in Beijing. Results Medical caregivers were satisfied with the contents of training and related theory teaching and practice provided during the period. The pass rate of the final assessment was 100%. Conclusion The training course for medical caregivers is reasonable and has achieved good results, which is a beneficial attempt to carry out standardized training of medical nurses in the future. (目的 探讨医疗护理员培训实践效果, 为更规范开展医疗护理员培训工作提供参考。方法 成立医疗护理员培训小组, 制定教学培训大纲及教学目标、管理要求、培训项目、教学条件、培训形式及考核等细则, 按照规范对11名护理员开展培训。结果 11名采用培训的护理员对培训内容、理论授课、操作培训、实践安排均表示满意, 均认同该培训模式, 学员考核通过率100. 00%。结论 通过成立规范的培训小组、设置合理的培训内容和课程, 有助于提升培训效果。)

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group 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.)

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Objective To understand the female college students' cognition of breast cancer knowledge, and provide scientific basis for health education in colleges and universities in the future. Methods Based on the existing questionnaire, female college students were taken as the research objects, The questionnaire was distributed randomly and the survey was conducted online. Results Totally 550 questionnaires were distributed and 500 were valid, with effective recovery rate of 90. 91%. There was a relatively low awareness rate of breast cancer knowledge among female college students. Female college students majored in Medical science were more knowledgeable in prevention of breast cancer compared with those who were not majored in Medical science. Conclusion Female college students have a low cognition level of breast cancer, it is necessary for colleges and universities to carry out relevant publicity and education, especially for non-medical professional students and low-grade professional students, to improve the self-health awareness of female college students, actively take correct preventive measures to reduce the incidence of breast cancer (目的 了解在校女大学生对乳腺癌相关知识的认知情况, 以为高校今后开展乳腺癌疾病健康教育提供科学依据。方法 自行设计调查问卷, 通过“问卷网”在线问卷调查平台对多所大学的在校女大学生进行线上问卷调查。结果 共发放问卷550份, 回收有效问卷500份, 有效回收率90. 91%。在校女大学生的乳腺癌相关知识掌握率偏低, 医学专业的女大学生乳腺癌预防相关知识的整体掌握情况优于非医学专业的女大学生。结论 在校女大学生的乳腺癌相关知识掌握情况不容乐观。高校应加强相关宣传教育, 尤其针对非医学专业的女大学生要开展更深入的宣教, 从而提高在校女大学生的自我保健意识, 采取正确的预防措施, 降低乳腺癌的发病率。)

Copyright of Journal of Atomic & Molecular Physics (1000-0364) is the property of Journal of Atomic & Molecular Physics 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.)

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Aiming at the source of farmland backwater and the characteristics of farmland retreat water pollution, this paper summarizes the domestic and international source control measures and ecological purification technology that can be used to treat farmland retreat water. After years of development and application, source control measures can reduce the amount of receding water and receding water pollution load at the source, which is a key strategy to control retreat water・ Ecological treatment technology has become the best retreat water treatment method available in rural areas because of its ecological benefits, construction costs and other advantages・ This paper summarizes the existing non-point pollution treatment modes, and provides a kind of ecological retention and purification of farmland retreat water treatment ide-血, and finally looks forward to the future development direction of farmland receding water treatment technology and provides reference for the future management of farmland retreat water. [ABSTRACT FROM AUTHOR]

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Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering 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.)

A residual analysis method for mefentrifluconazole in banana and mango was established using ultra high performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) detection technology. The field trial was conducted in banana and mango at six sites during one year according to NY/T 788-2018 the "Guideline for the Testing of Pesticide Residues in Crops" to study the degradation dynamics and residual distribution of mefentrifluconazole. After the application of the formulation of mefentrifluconazole 400 g/L suspension concentration (SC) on banana and mango crops, fruit samples were extracted with acetonitrile, purified with combined adsorbents of GCB and C18, and analyzed by UPLC-MS/MS. The results showed that at four spiked levels of 0.001-1 mg/kg, the average recovery of mefentrifluconazole in whole banana and flesh was 83%-93% with the relative standard deviation (RSD) 2.3% to 5.9%, and the average recovery of mefentrifluconazole in whole mango and flesh was 82%-91% with the RSD 2.9% to 6.0%, respectively; and the limit of quantification (LOQ) was 0.001 mg/kg. The field trials in banana showed that, under the condition of applying mefentrifluconazole 400 g/L SC at dosage of 133.3 mg/kg for 3 times with application interval of 7-10 days, the residues of mefentrifluconazole at 21 and 28 days after the last application were 0.03-0.09 mg/kg in whole banana and <0.001-0.004 mg/kg in the flesh. In the field trials of mango, under the condition of applying mefentrifluconazole 400 g/L SC at dosage of 160 mg/kg for 3 times with application interval of 7-10 days, residues of mefentrifluconazole were 0.04-0.28 mg/kg in whole mango and 0.001-0.003 mg/kg in the flesh at 14 and 21 days after the last application. The research results can provide a reference for guiding the scientific and rational use of mefentrifluconazole in banana and mango, as well as for the establishment of its maximum residue limit (MRL) values. [ABSTRACT FROM AUTHOR]

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As oil and gas wells are drilled deeper and deeper, higher formation pressures need to be balanced with high density drilling fluids, and this leads to another problems: the treatment of more and more high density waste muds. Waste muds are generally treated with chemical flocculants and problems such as high treatment cost, poor universality and potential secondary pollution are the norm. In a study an electric field was applied to treat a high density waste mud. Based on the results of a singlefactor experiment, the effects of three factors, i.e., current intensity, time of gel breaking and the distance between two electrodes, as well as the interaction of the three factors on the Zeta potential and particle size distribution of the drilling fluid were studied using response surface methodology (RSM). It was found that an optimum gel breaking can be obtained when the electric current intensity = 8 A, the time of gel breaking = 10 min, and the distance between two electrodes = 3 cm. After gel breaking, the Zeta potential of the drilling fluid was increased by 38.29%, reaching −26.2 mV, and the particle size distribution factor D90 reached 562.5 μm, indicating that the gel stability of the waste drilling fluid was broken, and this provided a powerful support to the subsequent recovery of the useful mud components as well as the treatment of the waste portion of the waste drilling fluid. [ABSTRACT FROM AUTHOR]

Copyright of Electric Power Automation Equipment / Dianli Zidonghua Shebei is the property of Electric Power Automation Equipment Press 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.)

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Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural 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.)