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An Improved Power Flow Method to Cope with Non-smooth Constraints of Integrated Energy Systems

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CSEE Journal of Power and Energy Systems 2022年第6期8卷 1784-1793页

作者： Yuntao Ju jiankai wang Zifeng Zhang College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China

Integrated energy system applications can significantly improve energy *** this paper,we establish an integrated energy system containing heat,electricity and *** existing power flow(PF)calculation method applied to integrated energy systems(IESs)does not consider non-smooth constraints,such as the piecewise pipeline friction coefficient and generator buses reactive power limits,*** integer nonlinear programming(MINLP)is conventionally used to deal with piecewise pipeline friction coefficients in gas network parts,but it is both complex and ***,we develop a piecewise linear function-based fitting method that can reduce the number of integer variables and enhanced the computational *** the electric network part,if the reactive power of the PV bus violates limits,it will be converted into a PQ bus,which is a non-differentiable and non-smooth *** complementarity problems are conventionally introduced to represent the PV-PQ buses type switching relationship and are addressed by the Newton-Raphson(NR)***,the above method is sensitive to the initial ***,we introduce a robust projected Levenberg-Marquardt(PLM)algorithm to cope with this *** demonstrate the advantages of our method and validate it both in a small-scale system and largescale network test cases.

关键词： Complementarity constraints integrated energy system non-smooth constraints piecewise linear function-based fitting method

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结合图像纹理的自适应透射率修正去雾算法

数据采集与处理 2024年第2期39卷 395-405页

作者：孙景荣陈哲哲王健凯宋诗斌赵静西安电子科技大学空间科学与技术学院西安710071 近地面探测技术重点实验室无锡214000 山东科技大学电气与自动化工程学院青岛266590 中咨泰克交通工程集团有限公司北京100083

图像去雾算法在户外智能监控及交通导航等领域普遍应用,通过去雾后提高图像的清晰度以提高目标的识别效果。暗通道及其改进算法在天空等景深灰色较亮区域的透射率估计存在偏差,易导致图像失真、细节模糊等问题,对智能交通领域图像识别... 详细信息

图像去雾算法在户外智能监控及交通导航等领域普遍应用,通过去雾后提高图像的清晰度以提高目标的识别效果。暗通道及其改进算法在天空等景深灰色较亮区域的透射率估计存在偏差,易导致图像失真、细节模糊等问题,对智能交通领域图像识别有严重影响。本文提出了自适应透射率去雾方法对透射率进行补偿,采用对数变换获得对数补偿算子调节景深区域透射率,根据图像信息丰富程度计算出暗通道的置信度,结合图像纹理信息构造出纹理补偿算子,通过自适应透射率补偿参数调整灰色亮部区域的初始透射率,可有效改善图像去雾后失真等问题。本算法的平均梯度、信噪比、信息熵等客观指标较其他去雾算法均有所提高,图像中灰色亮部区域透射率补偿效果良好,复原图像细节清晰自然、亮度适中,有效提升了图像质量。

关键词：透射率对数变换图像纹理信息图像去雾图像处理

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古龙页岩油勘探开发进展及发展对策

大庆石油地质与开发 2024年第4期43卷 125-136页

作者：崔宝文王瑞白云风刘立峰刘鑫王建凯刘召吕建才张红丽中国石油大庆油田有限责任公司黑龙江大庆163458 中国石油大庆油田有限责任公司勘探开发研究院黑龙江大庆163712 多资源协同陆相页岩油绿色开采全国重点实验室黑龙江大庆163712 中国石油勘探开发研究院北京100083

古龙页岩油是继常规油之后最为现实的接替资源,目前已经成为大庆油田增储上产的主要领域。通过系统阐述古龙页岩油勘探开发历程和分区带落实资源潜力,为古龙页岩油未来发展制定合理规划。结果表明:古龙页岩油主要经历了勘探评价、先导... 详细信息

古龙页岩油是继常规油之后最为现实的接替资源,目前已经成为大庆油田增储上产的主要领域。通过系统阐述古龙页岩油勘探开发历程和分区带落实资源潜力,为古龙页岩油未来发展制定合理规划。结果表明:古龙页岩油主要经历了勘探评价、先导试验和扩大试验3个勘探开发阶段;富有机质页岩具有面积广、厚度大、生油能力强等特点,页岩油富集的物质基础雄厚;古龙页岩油纵向上主要富集于下油组(Q_(1)―Q_(4)油层)和上油组的Q_(9)油层,平面上具有全盆地分布的特征,在古龙凹陷深凹区地质条件最为优越;按照轻质油带核心区―斜坡区―稀油带―低熟页岩油的规划,逐步对古龙页岩油实施勘探研究及开发动用;基于原生源储的富集规律,建立了原位成藏理论,古龙页岩油提交了12.68×10^(8)t的预测地质储量及2.04×10^(8)t的探明地质储量,指导了国家级示范区及全国重点实验室建设;应用体积法估算轻质油带Q9油层资源量为9.6×10^(8)t,轻质油带Q_(2)―Q_(8)油层整体资源量为38.8×10^(8)t,三肇地区稀油带资源量达11×10^(8)t以上,能够有效支撑古龙页岩油革命行动目标。通过加强理论研究,推动技术进步,推进管理创新,实现降本增效,古龙页岩油必将成为大庆油田资源接续和百年油田建设的重要领域。

关键词：古龙页岩油研究进展形成条件分布特征资源潜力发展对策

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Instance segmentation from small dataset by a dual-layer semantics-based deep learning framework

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Science China(Technological Sciences) 2024年第9期67卷 2817-2833页

作者： CHEN YiMing LI JianWei HU XiaoBing LIU YiRui MA jiankai XING Chen LI JunJie wang ZhiJun wang JinCheng State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

Efficient and accurate segmentation of complex microstructures is a critical challenge in establishing process-structure-property(PSP) linkages of materials. Deep learning(DL)-based instance segmentation algorithms show potential in achieving this ***, to ensure prediction reliability, the current algorithms usually have complex structures and demand vast training *** overcome the model complexity and its dependence on the amount of data, we developed an ingenious DL framework based on a simple method called dual-layer semantics. In the framework, a data standardization module was designed to remove extraneous microstructural noise and accentuate desired structural characteristics, while a post-processing module was employed to further improve segmentation accuracy. The framework was successfully applied in a small dataset of bimodal Ti-6Al-4V microstructures with only 112 samples. Compared with the ground truth, it realizes an 86.81% accuracy IoU for the globular αphase and a 94.70% average size distribution similarity for the colony structures. More importantly, only 36 s was taken to handle a 1024 × 1024 micrograph, which is much faster than the treatment of experienced experts(usually 900 s). The framework proved reliable, interpretable, and scalable, enabling its utilization in complex microstructures to deepen the understanding of PSP linkages.

关键词： instance segmentation dual-layer semantics deep learning small dataset Ti-6Al-4V

Attribution of Biases of Interhemispheric Temperature Contrast in CMIP6 Models

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Advances in Atmospheric Sciences 2024年第2期41卷 325-340页

作者： Shiyan ZHANG Yongyun HU jiankai ZHANG Yan XIA Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking UniversityBeijing 100871China College of Atmospheric Sciences Lanzhou UniversityLanzhou 730000China School of Systems Science Beijing Normal UniversityBeijing 100875China

One of the basic characteristics of Earth's modern climate is that the Northern Hemisphere(NH) is climatologically warmer than the Southern Hemisphere(SH). Here, model performances of this basic state are examined using simulation results from 26 CMIP6 models. Results show that the CMIP6 models underestimate the contrast in interhemispheric surface temperatures on average(0.8 K for CMIP6 mean versus 1.4 K for reanalysis data mean), and that there is a large intermodel spread, ranging from -0.7 K to 2.3 K. A box model energy budget analysis shows that the contrast in interhemispheric shortwave absorption at the top of the atmosphere, the contrast in interhemispheric greenhouse trapping, and the crossequatorial northward ocean heat transport, are all underestimated in the multimodel mean. By examining the intermodel spread, we find intermodel biases can be tracked back to biases in midlatitude shortwave cloud forcing in AGCMs. Models with a weaker interhemispheric temperature contrast underestimate the shortwave cloud reflection in the SH but overestimate the shortwave cloud reflection in the NH, which are respectively due to underestimation of the cloud fraction over the SH extratropical ocean and overestimation of the cloud liquid water content over the NH extratropical *** that underestimate the interhemispheric temperature contrast exhibit larger double ITCZ biases, characterized by excessive precipitation in the SH tropics. Although this intermodel spread does not account for the multimodel ensemble mean biases, it highlights that improving cloud simulation in AGCMs is essential for simulating the climate realistically in coupled models.

关键词： interhemispheric temperature contrast energy balance shortwave cloud forcing ITCZ CMIP6 AGCM

HF-VHF NEMS resonators enabled by 2D semiconductor ReSe2

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Science China(Information Sciences) 2024年第10期67卷 393-394页

作者： Jie TANG Ziluo SU Shuang CAI Yalan wang Luming wang Jiaqi WU Jiaze QIN jiankai ZHU Bo XU Juan XIA Zenghui wang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China

Two-dimensional（2D） semiconductors offer a plethora of new opportunities for constructing novel *** them, rhenium diselenide(ReSe2, crystal structure in Figure 1（a）) stands out due to its unique interlayer couplin...

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中国现当代文学作品英译的出版传播及研究方法刍议

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外语教学理论与实践 2012年第3期 15-22,7页

作者：王建开复旦大学

本文尝试以中国现当代作品英译的出版为对象,对其中若干重要事件给以概述和简评。具体从英译作品的出版发行与传播、销售与影响、不同读者群体的反应与接受、中外合作出版新模式等四个方面进行观察,力图显示大致的轨迹及得失。英译作品... 详细信息

本文尝试以中国现当代作品英译的出版为对象,对其中若干重要事件给以概述和简评。具体从英译作品的出版发行与传播、销售与影响、不同读者群体的反应与接受、中外合作出版新模式等四个方面进行观察,力图显示大致的轨迹及得失。英译作品的研究是对我国翻译史研究的有益补充,应大力加强,同时也要继续深入研究外来文学的译入。本文也试图以英译作品出版传播的得失,为英译作品的研究提示应关注的方面。这一研究正成为国内的学术新热点,有着很好的学术前景,但要做的工作还很多,尤其是要拓宽视野和途径,采用多元方法探究英译作品的接受境况。

关键词：中国现当代文学英译出版传播研究方法

文学翻译:西方观念影响近现代中国社会的媒介

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外国语 2019年第4期42卷 9-12页

作者：王建开复旦大学上海外国语大学贤达经济人文学院

一、引语清末民初,国人放眼看世界,西学东渐日盛(熊月之2011),引发翻译热潮,外国文学译介是其中重要一支。在清末民初的三四十年间,出版了近2000余部(篇)外国文学译作(刘树森1997:36)。进入现代,各国文学译介更加迅猛,达到4000多部(《... 详细信息

一、引语清末民初,国人放眼看世界,西学东渐日盛(熊月之2011),引发翻译热潮,外国文学译介是其中重要一支。在清末民初的三四十年间,出版了近2000余部(篇)外国文学译作(刘树森1997:36)。进入现代,各国文学译介更加迅猛,达到4000多部(《民国时期总书目(外国文学分册)1911-1949》),若以五四为界,1919-1949年间出版的各国文学译作至少4499部(王建开2003:64-65),并引起巨大反响(部振环1996)。因此,这段时期的文学译介一直是翻译史的研究重点。

关键词：文学翻译中国社会西方观念近现代媒介文学译介外国文学清末民初

母语者还是外语者:中国文学对外传播的译者资格之争——兼谈高校英语教师的能力转型

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外国语文 2016年第3期32卷 80-88页

作者：王建开复旦大学外文学院上海200433

当前,国内学术界有关中国文学走出去的讨论涉及到译者资格的重要问题。有意见认为,英语母语者有语言优势,应由他们担任中国文学对外传播之责。对此,本文分析了中外译者各自的长短,指出中国译者具有在语言理解和文化把握上的双重优势。并... 详细信息

当前,国内学术界有关中国文学走出去的讨论涉及到译者资格的重要问题。有意见认为,英语母语者有语言优势,应由他们担任中国文学对外传播之责。对此,本文分析了中外译者各自的长短,指出中国译者具有在语言理解和文化把握上的双重优势。并且,目前文学英译的大规模实施不仅要求数量庞大的译者加入,还需国家机构的资助和组织,这些是中国译者的独特环境,也是汉学家所不具备的。高校英语教师是丰富的译者资源,应发挥他们的专业能力,要从英译汉转到汉译英方向上来,为文学走出去的事业出力,为国家战略的需要服务。

关键词：中国文学英译母语译者短板中国译者优势英语教师转型