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Short-term Optimal Scheduling Model for Hydropower Stations Considering Peak Shaving of Local and HVDC Receiving Power Grids
Published 2024-01-01“…In the face of the increasingly severe peak shaving pressure on both sending and receiving power grids of the high voltage direct current (HVDC) of large-scale hydropower stations,a short-term optimal scheduling model that takes into account peak shaving of local and HVDC receiving power grids of the cascade hydropower stations has been established.The model aims to minimize the maximum value of residual load in multiple power grids,not only considering the conventional hydraulic and power constraints of the cascade hydropower stations and the complex operation constraints of the HVDC transmission lines but also introducing coupled operation constraints between the HVDC transmission line and the hydropower stations.In the model-solving phase,the original model is transformed into a mixed-integer linear programming model by introducing auxiliary variables to linearize the objective function,hydraulic operation constraints,and HVDC operation constraints and using the big M method to linearize the bi-directional interval coupled constraints between the HVDC transmission line and the hydropower stations.Typical winter and summer days in a large-scale hydropower system in southwestern China are taken as examples,and the results show that the peak-valley difference of the sending power grid has decreased by up to 100%,while the decrease in the peak-valley difference in the receiving end power grid is 28.1% and 31.6%,respectively.It shows that the proposed model can share the flexibility of hydropower through HVDC transmission lines,achieve peak shaving in multiple power grids,and ensure safe operation of the HVDC transmission lines,which can provide a reference for short-term multi-grid peak shaving of large-scale cascade hydropower stations.…”
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3023
Optimal D-STATCOM placement and sizing using a novel bird swarm operated exploitation of elephant herd algorithm
Published 2025-04-01“…The proposed Hybrid Algorithm, named Bird Swarm Operated Exploitation of Elephant Herd (BSOEEH), is tested under four different scenarios to determine its effectiveness compared to traditional optimization methods. …”
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3024
Comparative Analysis of Gut Microbiota Diversity Across Different Digestive Tract Sites in Ningxiang Pigs
Published 2025-03-01“…However, the diversity and functional roles of microbiota in different nutrient absorption tissues remain underexplored. …”
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3025
An analysis of the quality differences in black tea produced from various Oolong tea tree cultivars
Published 2025-06-01“…The non-volatile components and sensory quality of each tea sample were analysed using determination methods, such as high-performance liquid chromatography (HPLC), along with other relevant analytical evaluations. …”
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3026
Optimal Scheduling of Electric Vehicles for Peak Load Regulation: A Multi-Time Scale Approach with Comprehensive Evaluation and Feedback
Published 2025-04-01“…Simulations on the IEEE 33-node system demonstrate that the proposed model effectively optimizes EV load profiles, reducing the peak-to-valley difference rate from 41.74% to 35.19%. …”
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3027
Women’s Improvements in Cardiorespiratory Fitness Following Cardiac Rehabilitation Differ by Body Mass Index Category
Published 2025-04-01“…Background: Improving women’s cardiovascular outcomes requires optimizing cardiorespiratory fitness (CRF), as higher CRF predicts improved mortality in people with cardiovascular disease (CVD). …”
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3028
Coverage intensity of optimal sensors for common, isolated, and integrated steel structures using novel approach of FEM-MAC-TTFD
Published 2019-08-01“…The geometric configuration of sensors must be optimized based on coverage intensity with proper objectives. …”
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Optimal imaging time for Tc-99m phytate lymphoscintigraphy for sentinel lymph node mapping in patients with breast cancer
Published 2019-01-01“…In addition, patients with axillary lymph node metastasis had a higher percentage of SLN image mapping failure, with a marginally significant difference. Conclusion: Based on our study, 30 min after Tc-99m phytate injection is the optimal time for lymphoscintigraphy and delayed imaging beyond 30 min is not necessary. …”
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3032
Simultaneous Determination of Phenolic Acids, Anthraquinones, Flavonoids, and Triterpenes of Cynomorii Herba in Different Harvest Times by LC-MS/MS
Published 2020-01-01“…In conclusion, the validated method was successfully applied to analyze the change regularity of the twelve components of Cynomorii herba in different harvest times. …”
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A modification design method for the angular misalignment of the spline drum shaping
Published 2025-07-01“…ObjectiveTo address the edge contact and uneven load distribution caused by angular misalignment in involute spline pairs, an efficient optimal design method based on contact mechanical characteristics was proposed, overcoming the limitations of the low efficiency in traditional trial-and-error crowning modification approaches.MethodsFocusing on angular misaligned involute spline pairs, analytical prediction formulas for tooth contact regions under different modification amounts were established through analysis of contact extrusion deformation characteristics in drum-shaped splines. …”
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Dynamic Optimization of Bus Line Schedule in Commuter Corridor Based on Bus IC Card Data
Published 2022-01-01“…To solve the model, a dynamic departure interval optimization method based on improved Genetic Algorithm (GA) was designed under different decision preferences. …”
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3036
Biomechanical analysis of elastic fixation for lisfranc injuries with finite elements method
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3037
Prediction of clinical pregnancy after frozen embryo transfer based on ultrasound radiomics: an analysis based on the optimal periendometrial zone
Published 2025-04-01“…We determined the radiomics characteristics based on the ROIs of the endometrium and PEZ, then compared the different sizes of PEZ to determine the optimal PEZ. …”
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Optimal resistance training parameters for improving bone mineral density in postmenopausal women: a systematic review and meta-analysis
Published 2025-05-01“…Methods We systematically searched PubMed, Embase, Web of Science, and the Cochrane Library for studies evaluating the impact of resistance training programs on BMD in postmenopausal women, covering all records up to March 2025. …”
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Identification and Validation of Four Serum Biomarkers With Optimal Diagnostic and Prognostic Potential for Gastric Cancer Based on Machine Learning Algorithms
Published 2025-03-01“…ABSTRACT Background Gastric cancer (GC) is considered a highly heterogeneous disease, and currently, a comprehensive approach encompassing molecular data from various biological levels is lacking. Methods This study conducted different analyses, including the identification of differentially expressed genes (DEGs), weighted correlation networks (WGCNA), single‐cell RNA sequencing (scRNA‐seq), mRNA expression‐based stemness index (mRNAsi), and multiCox analysis, utilizing data from Gene Expression Omnibus (GEO) and The Cancer Genome Atlas (TCGA) databases. …”
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New Donor Selection Criteria Result in Optimal Outcomes of Kidneys from Uncontrolled Donation After the Circulatory Determination of Death
Published 2025-05-01“…Normothermic regional perfusion was the preservation method in uDCDD cases. Results. The study included 43 kidney recipients from uDCDD donors and 80 controls. …”
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