Combined Optimal Dispatch of Thermal Power Generators and Energy Storage Considering Thermal Power Deep Peak Clipping and Wind Energy Emission Grading Punishment

Peak load and wind energy emission pressure rise more as wind energy penetration keeps growing,which affects the stabilization of the PS(power system).This paper suggests integrated optimal dispatching of thermal power generators and BESS(battery energy storage system)taking wind energy emission grading punishment and deep peak clipping into consideration.Firstly,in order to minimize wind abandonment,a hierarchical wind abandonment penalty strategy based on fuzzy control is designed and introduced,and the optimal grid-connected power of wind energy is determined as a result of minimizing the peak cutting cost of the system.Secondly,considering BESS and thermal power,the management approach of BESS-assisted virtual peak clipping of thermal power generators is aimed at reducing the degree of deep peak clipping of thermal power generators and optimizing the output of thermal power generators and the charging and discharging power of BESS.Finally,Give an example of how this strategy has been effective in reducing abandonment rates by 0.66% and 7.46% individually for different wind penetration programs,and the daily average can reduce the peak clipping power output of thermal power generators by 42.97 and 72.31 MWh and enhances the effect and economy of system peak clipping.

基于CLIP模型和知识数据库的零样本动作识别

零样本动作识别旨在从已知类别的动作样本数据中学习知识,并将其迁移到未知的动作类别上,从而实现对未知动作样本的识别和分类.现有的零样本动作识别模型依赖有限的训练数据,可学习到的先验知识有限,难以将视觉特征准确地映射到语义标签上,是限制零样本学习性能提升的关键因素.针对上述问题,本文提出了一种引入外部知识数据库和CLIP模型的零样本学习框架,利用多模态CLIP模型通过自监督对比学习方式积累的知识,来扩充零样本动作识别模型的先验知识.同时,设计了时序编码器,以弥补CLIP模型时序建模能力的欠缺.为了使模型学习到更丰富的语义特征,缩小视觉特征和语义标签之间的语义鸿沟,本文扩展了已知动作类别的语义标签,用更为详细的描述语句代替简单的文本标签,丰富了文本表示的语义信息;在此基础上,在模型外部构建了一个知识数据库,在不增加模型参数规模的条件下为模型提供额外的辅助信息,强化视觉特征与文本特征表示之间的关联关系.最后,本文遵循零样本学习规范,对模型进行微调,使其适应零样本动作识别任务,提高了模型的泛化能力.所提方法在HMDB51和UCF101两个主流数据集上进行了广泛实验,实验数据表明,该方法的识别性能相比目前的先进方法在上述两个数据集上分别提升了3.8%和2.3%,充分体现了所提方法的有效性.

Study on the Effect of Magnetic Pole Clipping Angle on the Eddy Current Loss of Permanent Magnets in the Rotor of Magnetically Levitated Permanent Magnet Synchronous High-Speed Electric Spindles

Aiming at the problem of high temperature and even demagnetization failure of permanent magnet (PM) due to PM eddy current loss in PM synchronous high-speed motors, this paper proposes a technique to lessen PM eddy current loss by cutting the angle of PM poles to change the shape of PM structure. Firstly, an analysis is conducted on the mechanism of PM synchronous high-speed motor eddy current loss production, the theoretical analytical model of PM eddy current loss is deduced, and it is theoretically proved that the magnetic pole shaving angle can reduce PM eddy current loss. Then, a 25 KW surface-type PM synchronous high-speed motor as an object, using two-dimensional time-step finite element method (FEM) to model and analyze PM eddy current loss. The results show that the smaller the PM pole shaving angle, the less its eddy current loss will be, it is possible to minimize the pole shaving angle of eddy current loss by 9.8% compared to the unshaved angle. Finally, the temperature field of the PM is calculated using a finite element method, and the outcomes demonstrate that the maximum temperature of the PM with a magnetic pole shaving angle can be reduced by about 5% compared with the unshaved angle.

Bronchopleural fistula following application of Hem-o-lock clip at bronchial stump after lobectomy:A case report

BACKGROUND Hem-o-lock clip,a versatile and reliable non-absorbable tissue clip,has gained widespread acceptance in laparoscopic surgeries for vessel ligation and tissue approximation.Its efficacy and safety have been well-documented.CASE SUMMARY This case report describes the occurrence of a bronchopleural fistula following the application of the Hem-o-lock clip for the treatment of a lobar bronchial stump after lobectomy.CONCLUSION This case underscores the importance of exercising caution when using the Hem-o-lock clip for the management of non-vascular tissues during thoracic surgery.

Clip-stone and T clip-sinus post laparoscopic biliary surgery:Two case reports and review of the literature

BACKGROUND Laparoscopic cholecystectomy(LC)and laparoscopic common bile duct exploration(LCBDE)are widely used in gallbladder and biliary tract diseases.During these procedures,vessels or tissues are commonly ligated using clips.However,postoperative migration of clips to the common bile duct(CBD)or Ttube sinus tract is an overlooked complication of laparoscopic biliary surgery.Previously,most reported cases of postoperative clip migration involved metal clips,with only a few cases involving Hem-o-lok clips and review of the literature.CASE SUMMARY This report describes two cases in which Hem-o-lok clips migrated into the CBD and the T-tube sinus tract following laparoscopic surgery.Case 1 is a 68-year-old female admitted due to abdominal discomfort,and two Hem-o-lok clips were found to have migrated into the CBD 17 months after LC and LCBDE with T-tube drainage,and were removed using a stone extraction balloon.The patient was discharged smoothly after recovery.Case 2 is a 74-year-old male who underwent LC and LCBDE with T-tube drainage and laparoscopic biliary tract basket stone extraction.Nine weeks postoperatively,following T-tube removal,a Hem-o-lok clip was found in the sinus tract,and was extracted from the T-tube sinus tract.The patient recovered smoothly postoperatively.This study also reviews the literature from 2013 to July 2024 on using Hem-o-lok clips in LC and/or LCBDE treatment of gallbladder and biliary diseases and the postoperative migration of these clips into the CBD,T-tube sinus tract,or duodenum.CONCLUSION In patients with a history of LC and/or LCBDE,clip migration should be considered as a differential diagnosis.

关于平面Clipping随机场的若干性质

讨论了平面随机场关于水平 μ 的 clipping 随机场的各向同性,齐性,独立性和可分性的若干结果.

脉冲噪声环境中基于clipping方法的鲁棒LPFT及其重排算法

为了更好地处理脉冲噪声环境中的时变信号,本文提出了基于clipping方法的鲁棒局部多项式傅里叶变换(LPFT)及其重排算法。首先利用clipping方法对信号中掺杂的脉冲噪声进行抑制,得到较好的信号时频分布表示,然后将重排算法与该鲁棒LPFT相结合,以提高信号的时频聚集性。通过实验仿真可以看出,与基于中值滤波器的鲁棒LPFT相比,基于clipping方法的鲁棒LPFT同样能对被脉冲噪声干扰的信号给出较好的时频表示,而且其瞬时频率估计的最小均方误差(MSE)较低,计算量较小。并且,本文在基于clipping方法的鲁棒LPFT对掺杂脉冲噪声的信号进行处理的基础上,利用重排算法与其结合,有效增强了信号的时频聚集性。因此基于clipping方法的鲁棒LPFT及其重排算法是一种高效的处理脉冲噪声干扰信号及提高信号时频聚集性的方法。

用于降低OFDM系统峰均功率比的PTS-Clipping联合算法

基于IEEE 802.16d协议的OFDM传输系统,研究了峰均功率比(PAPR)较高的原因,在现有PARR降低算法的基础上,深入研究了算法之间的最佳联合准则,比较了两种可行的联合算法PTS-Clipping和Clipping-PTS之间的性能差异,得出了算法联合时的最佳级联顺序。Matlab仿真结果表明,PTS-Clipping是较优的联合算法,能够最大限度地利用现有算法的优势,在很好地降低PAPR的同时,又不会引入很大的计算量和限幅噪声。另外,本文得出的最佳联合准则具有通用性,适用于其他PAPR降低算法之间的联合。

基于CLIP和交叉注意力的多模态情感分析模型

针对多模态情感分析中存在的标注数据量少、模态间融合不充分以及信息冗余等问题,提出了一种基于对比语言-图片训练(CLIP)和交叉注意力(CA)的多模态情感分析(MSA)模型CLIP-CA-MSA。首先,该模型使用CLIP预训练的BERT模型、PIFT模型来提取视频特征向量与文本特征;其次,使用交叉注意力机制将图像特征向量和文本特征向量进行交互,以加强不同模态之间的信息传递;最后,利用不确定性损失特征融合后计算输出最终的情感分类结果。实验结果表明:该模型比其他多模态模型准确率提高5百分点至14百分点,F1值提高3百分点至12百分点,验证了该模型的优越性,并使用消融实验验证该模型各模块的有效性。该模型能够有效地利用多模态数据的互补性和相关性,同时利用不确定性损失来提高模型的鲁棒性和泛化能力。

Analysis of wave clipping effects of plain reservoir artificial islands based on MIKE21 SW model

Plain reservoirs are shallow, and have low dams and widespread water surfaces.Therefore, wind-wave-induced damage to the dam is one of the important factors affecting the safety of the reservoir.To improve upon unsatisfactory plain reservoir wave-clipping schemes, a numerical method is proposed to predict and analyze waves in the reservoir in the presence of artificial islands, constructed from dredged sediment.The MIKE21 SW model is applied to a specific plain reservoir for finding the optimal artificial island parameters.The simulated wave height attenuation results are seen to agree well with empirically predicted values.Thus, the validity and reliability of the numerical model are established.Artificial islands at suitable locations in the reservoir can attenuate the wave heights by approximately 10%e30%, which justifies the efficacy of the clipping scheme making use of dredging and island construction.

Role of endoscopic clipping in the treatment of oesophagealperforations

With advances in endoscopic technologies,endoscopic clips have been used widely and successfully in the treatment of various types of oesophageal perforations,anastomosis leakages and fistulas. Our aim was to summarize the experience with two types of clips: The through-the-scope(TTS) clip and the over-the-scope clip(OTSC). We summarized the results of oesophageal perforation closure with endoscopic clips. We processed the data from 38 articles and 127 patients using PubM ed search. Based on evidence thus far,it can be stated that both clips can be used in the treatment of early(< 24 h),iatrogenic,spontaneous oesophageal perforations in the case of limited injury or contamination. TTS clips are efficacious in the treatment of 10 mm lesions,while bigger(< 20 mm) lesions can be treated successfully with OTSC clips,whose effectiveness is similar to that of surgical treatment. However,the clinical success rate is significantly lower in the case of fistulas and in the treatment of anastomosis insufficiency. Tough prospective randomized multicentre trials,which produce the largest amount of evidence,are still missing. Based on experience so far,endoscopic clips represent a possible therapeutic alternative to surgery in the treatment of oesophageal perforations under well-defined conditions.

Applications of multislice CT angiography in the surgical clipping and endovascular coiling of intracranial aneurysms

Prompt diagnosis and therapy of aneurysms are critical for patients with nontraumatic subarachnoid hemorrhage （SAH）.The aim of our study was to assess the clinical usefulness of multislice computed tomography angiography （CTA） in the surgical and endovascular treatment of intracranial aneurysms.A total of 195 cases with 206 intracranial aneurysms underwent CTA.Fifty （24%） aneurysms underwent surgical clipping while 156 （76%） aneurysms underwent endovascular coiling.In the five missed aneurysms at digital substraction angiography and the nine aneurysms with mass intracerebral hematomas,surgical treatment was successfully performed based on 16-slice CTA alone,and the other 36 aneurysms were clipped on the main basis of the CTA.The intraoperative findings correlated well with the CTA findings and all aneurysms were clipped successfully.Sixteen-slice CTA image information has been shown to determine the choice of aneurysm therapy and assist the surgical and endovascular treatment of intracranial aneurysms.

基于CLIP与注意力机制的跨模态哈希检索算法

针对传统无监督跨模态检索算法提取样本内部与样本之间的关联语义不充分,导致检索准确率低的问题,提出一种基于CLIP与注意力融合机制的无监督跨模态哈希检索算法CAFM_Net。将多模态预训练模型CLIP运用到样本特征提取阶段,从不同维度挖掘数据的相似信息;使用注意力融合机制对提取的特征进行处理,加强显著区域的权重;引入对抗学习的思想设计模态分类器,生成更趋于语义一致性的跨模态数据哈希编码。与现有的代表性哈希方法相比,CAFM_Net在多模态检索任务上准确率提升至少11%与9%。

Clipping Alters the Response of Biomass Production to Experimental Warming: A Case Study in an Alpine Meadow on the Tibetan Plateau, China

Predicting how human activity will influence the response of alpine grasslands to future warming has many uncertainties.In this study, a field experiment with controlled warming and clipping was conducted in an alpine meadow at three elevations（4313 m, 4513 m and 4693 m） in Northern Tibet to test the hypothesis that clipping would alter warming effect on biomass production.Open top chambers（OTCs） were used to increase temperature since July,2008 and the OTCs increased air temperature by approximately 0.9o C ~ 1.8o C during the growing in2012.Clipping was conducted three times one year during growing season and the aboveground parts of all live plants were clipped to approximately 0.01 m in height using scissors since 2009.Gross primary production（GPP） was calculated from the Moderate-Resolution Imaging Spectroradiometer GPP algorithm and aboveground plant production was estimated using the surface-measured normalized difference vegetation index in 2012.Warming decreased the GPP, aboveground biomass（AGB） and aboveground net primary production（ANPP） at all three elevations when clipping was not applied.In contrast, warming increased AGB at all three elevations, GPP at the two lower elevations and ANPP at the two higher elevations when clipping was applied.These findings show that clipping reduced the negative effect of warming on GPP, AGB and ANPP, suggesting that clipping may reduce the effect of climate warming on GPP, AGB and ANPP in alpine meadows on the Tibetan Plateau, and therefore, may be a viable strategy for mitigating the effects of climate change on grazing and animal husbandry on the Tibetan Plateau.

A new hemostatic clip for endoscopic surgery that can maintain blood flow after clipping

AIM: To develop a new hemostatic device for endoscopic surgery that can control the bleeding without completely occluding the bleeding vessel.

Reduction of the Clipping Noise for OFDM/OQAM System

Orthogonal frequency division multiplex/offset QAM (OFDM/OQAM) has been proven to be a promising multi-carrier modulation (MCM) technique for the transmission of signals over multipath fading channels. However, OFDM/OQAM has also the intrinsic disadvantage of high peak-to-average-power ratio (PAPR) that should be alleviated. This paper focuses on the reduction of the clipping noise and out-of band radiation caused by the clipping process. The basic principle is to estimate the clipping noise and then eliminate it from the received signal. Analysis and simulation results show that, with one time iteration, the proposed method can effectively improve the bit error ratio (BER) performance.

Clipping prevents perforation in large, flat polyps

AIM To determine if prophylactic clipping of post-polypectomy endoscopic mucosal resection(EMR) mucosal defects of large,flat,right sided polyps prevents perforations.METHODS IRB approved review of all colonoscopies,and prospective data collection of grasp and snare EMR performed by 2 endoscopists between January 1,2010 and March 31,2014 in a community ambulatory endoscopy center.The study consisted of two phases.In the first phase,all right-sided,flat polyps greater than or equal to 1.2 cm in size were removed using the grasp and snare technique.Clipping was done at the discretion of the endoscopist.In the second phase,all mucosal defects were closed using resolution clips.Phase 2 of the study was powered to detect a statistically significant difference in perforation rate with 148 EMRs,if less than or equal to 2 perforations occurred.RESULTS In phase 1 of the study,2121 colonoscopies were performed.Seventy-five patients had 95 large polyps removed.There were 4 perforations in 95 polypectomies(4.2%).The perforations occurred in polyps ranging in size from 1.5 cm to 2.5 cm.In phase 2,there were 2464 colonoscopies performed.One hundred and sixteen patients had 151 large polyps removed,and all mucosal defects were clipped.There were no perforations(P=0.0016).There were no post-polypectomy hemorrhages in either phase.An average of 2.15 clips were required to close the mucosal defects.The median time to perform the polypectomy and clipping was 13 min,and the median procedure duration was 40 min.Five percent of all patients undergoing colonoscopy in our community based,ambulatory endoscopy center had flat,right sided polyps greater than or equal to 1.2 cm in size.CONCLUSION Prophylactic clipping of the mucosal resection defect of large,right-sided,flat polyps reduces the incidence of perforation.

Human Nail Clippings as a Source of DNA for Genetic Studies

Blood samples have traditionally been used as the main source of DNA for genetic analysis. How-ever, this source can be difficult in terms of collection, transportation, and long-term storage. In this study, we investigated whether human nail clippings could be used as a source of DNA for SNP genotyping, null-allele detection, and whole-genome amplification. From extracted nail DNA, we achieved amplicons up to a length of ~400 bp and >96% concordance for SNP genotyping and 100% concordance for null-allele detection compared to DNA derived from matched blood sam-ples. For whole-genome amplification, OmniPlex performed better than Multiple Displacement Amplification with a success rate of 89.3% and 76.8% for SNP genotyping and null-allele detection, respectively. Concordance was ~98% for both methods. When combined with OmniPlex whole-genome amplification, human nail clippings could potentially be used as an alternative to whole blood as a less invasive and more convenient source of DNA for genotyping studies.

The Line Clipping Algorithm Basing on Affine Transformation

A new algorithm for clipping line segments by a rectangular window on rectangular coordinate system is presented in this paper. The algorithm is very different to the other line clipping algorithms. For the line segments that cannot be identified as completely inside or outside the window by simple testings, this algorithm applies affine transformations (the shearing transformations) to the line segments and the window, and changes the slopes of the line segments and the shape of the window. Thus, it is clear for the line segment to be outside or inside of the window. If the line segments intersect the window, the algorithm immediately (no solving equations) gets the intersection points. Having applied the inverse transformations to the intersection points, the algorithm has the final results. The algorithm is successful to avoid the complex classifications and computations. Besides, the algorithm is effective to simplify the processes of finding the intersection points. Comparing to some classical algorithms, the algorithm of this paper is faster for clipping line segments and more efficient for calculations.

Outcomes of early physiotherapy in patients with cerebral aneurysms treated by surgical clipping or endovascular embolization

Early physiotherapy was given to 124 patients with ruptured or unruptured cerebral aneurysms who were treated by surgical clipping or endovascular embolization.Patients were divided into four groups according to their Hunt and Hess grade at admission and aneurysm treatment modality： Group 1,Hunt and Hess grade≤II and surgical clipping;Group 2,Hunt and Hess grade≤II and endovascular embolization;Group 3,Hunt and Hess grade≥III and surgical clipping;Group 4,Hunt and Hess grade≥III and endovascular embolization.Level of consciousness was evaluated using the Glasgow Coma Scale,functional status using the Glasgow Outcome Scale,level of the mobility using the Mobility Scale for acute stroke patients,and independence in activities of daily living using the Barthel Index.After early physiotherapy,the level of consciousness and functional status improved significantly in Groups 1,3,and 4;mobility improved significantly in all groups;and independence in activities of daily living improved significantly in Groups 1 and 3.At discharge, Groups 1 and 2 had better functional status than Groups 3 and 4.Level of consciousness,functional status,mobility and independence in activities of daily living improved after early physiotherapy. These findings suggest that early physiotherapy improved the prognosis of patients with cerebral aneurysms who were treated by surgical clipping or endovascular embolization.Patients with a worse clinical status at presentation had a poorer functional status at discharge.The outcome of physiotherapy was not affected by whether surgical clipping or endovascular embolization was chosen for treatment of the aneurysm.