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Improve Strategy for Transient Power Angle Stability Control of VSG Combining Frequency Difference Feedback and Virtual Impedance

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Energy Engineering 2025年第2期122卷 651-666页

作者： Dianlang Wang Qi Yin Haifeng Wang Jing Chen Hong Miao Yihan Chen Substation Management office Qujing Bureau of CSG EHV Power Transmission CompanyQujing655000China College of Electrical Engineering SichuanUniversityChengdu610065China

As the penetration rate of distributed energy increases,the transient power angle stability problem of the virtual synchronous generator(VSG)has gradually become *** view of the situation that the grid impedance ratio(R/X)is high and affects the transient power angle stability of VSG,this paper proposes a VSG transient power angle stability control strategy based on the combination of frequency difference feedback and virtual *** improve the transient power angle stability of the VSG,a virtual impedance is adopted in the voltage loop to adjust the impedance ratio R/X;and the PI control feedback of the VSG frequency difference is introduced in the reactive powervoltage link of theVSGto enhance the damping ***-orderVSGdynamic nonlinearmodel considering the reactive power-voltage loop is established and the influence of different proportional integral(PI)control parameters on the system balance stability is ***,the impact of the impedance ratio R/X on the transient power angle stability is presented using the equal area *** the simulations,during the voltage dips with the reduction of R/X from 1.6 to 0.8,Δδ_(1)is reduced from 0.194 rad to 0.072 rad,Δf_(1)is reduced from 0.170 to 0.093 Hz,which shows better transient power angle *** results verify that compared with traditional VSG,the proposedmethod can effectively improve the transient power angle stability of the system.

关键词： Transient synchronous stability virtual synchronous generator impedance ratio

Substrate topography as a powerful tool to modify glial cell biology and interactions

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Neural Regeneration Research 2025年第5期20卷 1390-1391页

作者： Pascal Achenbach Haktan Altinova Gary A.Brook Institute of Neuropathology RWTH Aachen University Hospital Department of Neurosurgery RWTH Aachen University Hospital Aachen Germany Berlin State office for Health and Social Affairs(LAGeSo) BerlinGermany

Traumatic injuries to the central nervous system(CNS) result in disruption of the intricate network of axons which connect functionally related neurons that are widely distributed throughout the brain and spinal *** normal conditions,maintenance of this complex system is structurally and functionally supported by astrocytes (ACs)and other glial cells,the processes of which form a framework surrounding neuronal cell bodies,dendrites,axons,and synapses.

关键词： injuries topography system

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Integrating machine learning and human use experience to identify personalized pharmacotherapy in Traditional Chinese Medicine:a case study on resistant hypertension

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Journal of Traditional Chinese Medicine 2025年第1期45卷 192-200页

作者： CHE Qianzi LIU Dasheng XIANG Xinghua TIAN Yaxin XIE Feibiao XU Wenyuan LIU Jian WANG Xuejie WANG Liying BAI Weiguo HAN Xuejie YANG Wei Department of Medical Statistics Institute of Basic Research in Clinical MedicineChina Academy of Chinese Medical Sciences Department of Science and Education Medical Statistics Teaching and Research OfficeInstitute of Basic Research in Clinical MedicineChina Academy of Chinese Medical Sciences Computer Department Xiyuan Hospital of the China Academy of Chinese Medical Sciences Traditional Chinese Medicine Standards Research Center Medical Statistics Teaching and Research OfficeInstitute of Basic Research in Clinical MedicineChina Academy of Chinese Medical Sciences

OBJECTIVE: To enhance the understanding of identifying personalized pharmacotherapy options in Traditional Chinese Medicine(TCM), and further support the registration of new TCM drugs. METHODS: Generalized Boosted Models and XGBoost were employed to construct a classification model to identify the bad prognosis factors in resistant hypertension(RH) patients. Furthermore, we used association analysis to explore the rules of "symptomsyndrome" and "symptom-herb" for the major influencing factors, in order to summarize prescription pattern and applicable patients of TCM. RESULTS: Patients with major adverse cardiac events mostly have complex symptoms of phlegm, stasis, deficiency and fire intermingled with each other, and finally summarized the human experience of using Chinese herbal medicine to precisely intervene in some symptoms of RH patients on the basis of conventional Western medical treatment. CONCLUSIONS: Machine learning algorithms can make full use of human use experience and evidence to save clinical trial resources and accelerate the development of TCM varieties.

关键词： human clinical experience machine learning new drugs registration personalized pharmacotherapy

Implement the Guiding Principles of the Third Plenary Session of the 20th CPC Central Committee and Ensure High-Quality Development through High-Level Security

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Contemporary International Relations 2025年第1期35卷 4-27页

作者： Yang Mingjie Chen Xiangyang Chen Qinghong Han Yafeng President of China Institutes of Contemporary International Relations(CICIR) office of the Center for Studies on a Holistic Approach to National Security

As a major principle underlying the Communist Party of China's(CPC)governance in the new era and a core piece of its holistic approach to national security,ensuring both development and security emphasizes comprehensive governance from a long-term perspective and influences the world with its global *** keeps pace with the times by prioritizing innovative areas and is of great theoretical and practical *** the new journey ahead,we must firmly ensure both development and *** importantly,we must ensure both high-quality development and high-level security,safeguarding the former through the *** is an urgent requirement we face in today's world,which has entered a period of turbulence and transformation characterized by increasing *** with the formidable tasks of promoting reform and development while maintaining stability at home and the grave challenges brought about by international turbulence and changes,we must earnestly implement the guiding principles of the 20th CPC National Congress and the third plenary session of the 20th Party Central *** should ensure secure and sustainable development,accelerate efforts to modernize China's national security system and capacity,foster high-level security,and improve the mechanisms for preserving national security in foreign-related *** short,we should strive to achieve a positive interplay between high-quality development and high-level security,so as to effectively safeguard Chinese modernization.

关键词： ensure both development and security high-level security Central Committee new quality combat capabilities third plenary session of the 20th CPC Central Committee

Investigation of spatiotemporal distribution and formation mechanisms of ozone pollution in eastern Chinese cities applying convolutional neural network

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Journal of Environmental Sciences 2025年第2期148卷 126-138页

作者： Qiaoli Wang Dongping Sheng Chengzhi Wu Xiaojie Ou Shengdong Yao Jingkai Zhao Feili Li Wei Li Jianmeng Chen 无 College of Environment Zhejiang University of TechnologyHangzhou 310032China Key Laboratory of Biomass Chemical Engineering of the Ministry of Education Institute of Industrial Ecology and EnvironmentCollege of Chemical and Biological EngineeringZhejiang University(Zijingang Campus)Hangzhou 310027China Trinity Consultants Inc.(China office)Hangzhou 310012China Zhejiang University of Science&Technology Hangzhou 310023China

Severe ground-level ozone(O_(3))pollution over major Chinese cities has become one of the most challenging problems,which have deleterious effects on human health and the sustainability of *** study explored the spatiotemporal distribution characteristics of ground-level O_(3) and its precursors based on conventional pollutant and meteorological monitoring data in Zhejiang Province from 2016 to ***,a high-performance convolutional neural network(CNN)model was established by expanding the moment and the concentration variations to general ***,the response mechanism of O_(3) to the variation with crucial influencing factors is explored by controlling variables and interpolating target *** results indicated that the annual average MDA8-90th concentrations in Zhejiang Province are higher in the northern and lower in the *** the wind direction(WD)ranges from east to southwest and the wind speed(WS)ranges between 2 and 3 m/sec,higher O_(3) concentration prone to *** different temperatures(T),the O_(3) concentration showed a trend of first increasing and subsequently decreasing with increasing NO_(2) concentration,peaks at the NO_(2) concentration around 0.02mg/m^(3).The sensitivity of NO_(2) to O_(3) formation is not easily affected by temperature,barometric pressure and dew point ***,there is a minimum IRNO_(2) at each temperature when the NO_(2) concentration is 0.03 mg/m^(3),and this minimum IRNO_(2) decreases with increasing *** study explores the response mechanism of O_(3) with the change of driving variables,which can provide a scientific foundation and methodological support for the targeted management of O_(3) pollution.

关键词： Ozone Spatiotemporal distribution Convolutional neural network Ozone formation rules Incremental reactivity

Can patients with mild non-neoplastic lesions diagnosed at baseline screening be safely exempt from surveillance: evidence from multicenter community-based cohorts

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Science China(Life Sciences) 2025年第1期68卷 263-271页

作者： Siyi He Zhiyi Zhang Guohui Song Zhenhai Wang Chunyun Dai Shipeng Yan Kun Jiang Bingbing Song He Li Maomao Cao Dianqin Sun Fan Yang Xinxin Yan Shaoli Zhang Yi Teng Qianru Li Changfa Xia Wanqing Chen office of Cancer Screening National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China Department of Gastroenterology Gansu Wuwei Tumor HospitalWuwei 730000China Cixian Cancer Institute Handan 056500China Linzhou Cancer Hospital Linzhou 456550China Center for Disease Control and Prevention of Sheyang County Yancheng 224499China Department of Cancer Prevention and Control Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of MedicineCentral South UniversityChangsha 410029China Luoshan Center for Disease Control and Prevention Xinyang 464299China office for Cancer Control and Research Affiliated Cancer Hospital of Harbin Medical UniversityHarbin 150081China

Surveillance recommendations for gastric cancer(GC)in current guidelines focused on advanced precancerous lesions and were based on precise diagnosis of severity/extent of baseline *** aimed to develop a less endoscopy-related equipment-dependent risk-stratification tool,and assessed whether mild-precursor-lesion patients can be safely exempt from *** the multicenter communitybased cohort,75,051 participants receiving baseline endoscopy were enrolled during 2015–2017 and followed-up until *** incidence rates(CIRs)of GC for precancerous-conditions were calculated by Kaplan-Meier method and compared by Log-rank *** Cox regression models were used to detect potential factors for progression towards GC.A risk score was calculated as counts of selected *** independent cohort,including 26,586 participants was used for external *** a median follow-up of 6.25 years,CIRs of GC were 0.302%,0.436%,and 4.756%for normal group,non-neoplastic(atrophic gastritis/intestinal metaplasia)and neoplastic lesions(low-grade/high-grade dysplasia),respectively(Ptrend<0.001).Four predictors,including male,≥60 years,smoking,and limited vegetable consumption,were selected for ***-risk patients(≥3 risk factors)with non-neoplastic lesions showed higher GC risks(adjusted HR=7.73,95%CI:4.29–13.92),and their four-year CIR reached the one-year CIR of neoplastic *** categorizing non-neoplastic lesions by histological grade,both patients with moderate-to-severe lesions(aHR=3.07,95%CI:1.67–5.64)and high-risk patients with mild lesions(aHR=7.29,95%CI:3.58–14.86)showed higher *** trends were observed in validation ***-risk mild-precursor-lesion patients should receive surveillance within 3–5 years after baseline *** study provides evidence on supplementing current guideline recommendations.

关键词： stomach neoplasms precancerous conditions cancer screening cumulative incidence risk stratification

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Novel Low-Carbon Optimal Operation Method for Flexible Distribution Network Based on Carbon Emission Flow

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Energy Engineering 2025年第2期122卷 785-803页

作者： Chao Gao Kai Niu Wenjing Chen Changwei Wang Yabin Chen Rui Qu Guangdong-Hong Kong-Macao Greater Bay Area Construction Promotion office of Guangdong Power Grid Co. Ltd.Guangzhou510030China School of Electrical Engineering Northeast Electric Power UniversityJilin132012China School of Electrical Engineering Fuzhou UniversityFuzhou350116China

With the widespread implementation of distributed generation(DG)and the integration of soft open point(SOP)into the distribution network(DN),the latter is steadily transitioning into a flexible distribution network(FDN),the calculation of carbon flow distribution in FDN is more *** this end,this study constructs a model for low-carbon optimal operations within the FDN on the basis of enhanced carbon emission flow(CEF).First,the carbon emission characteristics of FDNs are scrutinized and an improved method for calculating carbon flow within these networks is ***,a model for optimizing low-carbon operations within FDNs is formulated based on the refined CEF,which merges the specificities of DG and intelligent ***,this model is scrutinized using an upgraded IEEE 33-node distribution system,a comparative analysis of the cases reveals that when DG and SOP are operated in a coordinated manner in the FDN,with the cost of electricity generation was reduced by 40.63 percent and the cost of carbon emissions by 10.18 *** findings indicate that the judicious optimization of areas exhibiting higher carbon flow rates can effectively enhance the economic efficiency of DN operations and curtail the carbon emissions of the overall network.

关键词： Flexible distribution network carbon emission flow distributed generation soft open points

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Guide for Authors

Chinese Journal of Aeronautics 2025年第1期38卷 F0003-F0003页

作者： Editorial office of Chinese Journal of Aeronautics Editorial office of Chinese Journal of Aeronautics 2025

About Journal Chinese Journal of Aeronautics (CJA) is a comprehensive academic journal dealing with the fields of aeronautics and *** reports researches concerning the two fields in China and abroad to promote the academic *** in 1988 and sponsored by the Chinese Society of Aeronautics and Astronautics and Beihang University, CJA publishes papers monthly.

关键词： dealing journal concerning

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Effects of temperature and salinity on the seed germination of Limonium strictissimum(Salzm.)Arrigoni in the Mediterranean Basin

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Journal of Arid Land 2025年第2期17卷 259-270页

作者： Ludovica DESSÌ Alba CUENA-LOMBRAÑA Lina PODDA Marco PORCEDDU Mauro FOIS Lillia FAUSTI Carole PIAZZA Gianluigi BACCHETTA Sardinian Germplasm Bank(BG-SAR) Centre for Conservation of Biodiversity(CCB)Department of Life and Environmental SciencesUniversity of CagliariCagliari 09123Italy National Botanical Conservatory of Corsica Office of the Environment of CorsicaCorte F-20250France

Salt stress might be an important factor that decreases the emergence of seedlings and reduces plants'growth,causing their endangered ***,the effects of salt stress on the germination of the Mediterranean species are less *** strictissimum(Salzm.)Arrigoni,part of the group related to Limonium articulatum(Loisel.)Kuntze,is a Cyrno-Sardinian endemism,which is included in the International Union for Conservation of Nature(IUCN)Red Lists as Endangered(EN).Fresh seeds of *** harvested from the only known population in Sardinia and a population in southeastern Corsica were used with the aims to study the effects of temperature and salinity on the seed germination and to evaluate the ability to recover their germination after exposure to salt *** both populations,empty fruits with a lower percentage were observed in Sardinia than in *** seeds showed a high germination capacity,which was not influenced by temperature and did not even differ between the two *** with non-saline condition,the presence of salt in the substrate,independently of the concentration tested,inhibited seed germination in both populations,with germination percentages never exceeding 40%.The Sardinian population showed a recovery capacity after exposure to high salt stress,always above 50%regardless of the salt concentration and incubation temperature *** seeds previously exposed to 125 mM NaCl at 30℃ had the lowest recovery percentage(56%),while the highest recovery percentage(84%)was recorded at 25℃ with a concentration of 250 mM ***,the Corsican population recorded a higher recovery percentage(54%)in seeds previously exposed to 500 mM NaCl at 20℃,while for the concentration of 125 mM NaCl,the best recovery percentage(11%)was recorded at 30℃.The ability of *** to recover germination after salt exposure can be interpreted as an adaptation to the coastal habitats in which it *** study provides n

关键词： Limonium Mill. Mediterranean vascular flora NaCl recovery phase salt stress endemic species threatened species