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Two-stage robust optimization of power cost minimization problem in gunbarrel natural gas networks by approximate dynamic programming

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Petroleum Science 2022年第5期19卷 2497-2517页

作者： Yi-Ze Meng Ruo-Ran Chen Tian-hu deng Department of Industrial Engineering Tsinghua UniversityBeijing100084China

In short-term operation of natural gas network,the impact of demand uncertainty is not *** address this issue we propose a two-stage robust model for power cost minimization problem in gunbarrel natural gas *** demands between pipelines and compressor stations are uncertain with a budget parameter,since it is unlikely that all the uncertain demands reach the maximal deviation *** solving the two-stage robust model we encounter a bilevel problem which is challenging to *** formulate it as a multi-dimensional dynamic programming problem and propose approximate dynamic programming methods to accelerate the *** results based on real network in China show that we obtain a speed gain of 7 times faster in average without compromising optimality compared with original dynamic programming *** results also verify the advantage of robust model compared with deterministic model when facing *** findings offer short-term operation methods for gunbarrel natural gas network management to handle with uncertainties.

关键词： Natural gas Gunbarrel gas pipeline networks Robust optimization Approximate dynamic programming

Complex genesis of multiperiod fractures in the Middle Triassic Leikoupo Formation in the Pengzhou gas field, western Sichuan Basin, China

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Petroleum Science 2023年第1期20卷 161-176页

作者： Xiao-Fei hu hu-Cheng deng Jian-hua He Zhong-Min Shen Xian-Feng Peng College of Energy Chengdu University of TechnologyChengduSichuan 610059China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Chengdu University of Technology) ChengduSichuan 610059China

The cumulative expression of multistage deformation is complex multiperiod fractures,which are commonly seen in tectonic *** Middle Triassic Leikoupo Formation in the western Sichuan Basin Depression,China,is a typical marine carbonate reservoir with natural fractures caused mainly by tectonic *** to outcrops,drill cores,image logging,and fluid inclusions,the fracture characteristics,types of natural fractures,and interactions of fractures are *** total,419 natural fractures in 493.2 m of cores from 7 wells are investigated,which are mainly shear and tensile fractures with a small number of weathering generated ***,the results of the stable isotope analysis of δ13C and δ18O,as well as the flow fluid inclusion data,reveal four tectonic periods of fractures with different *** on the history of regional tectonic evolution,indicating one period of weathering fractures ascribable to stratal uplift and three periods of structural fractures related to the sequential tectonic movements of the Longmenshan fault *** analyzing the interaction relationships of fractures,three types of fracture interaction relationships are observed:cutting,restraining,and *** four stages fractures are chronologically assigned to(1)the early Indosinian N-S trending compression,(2)the late Indosinian NW-SE compression,(3)the middle Yanshanian NE-SE compression,and(4)the early Himalayan E-W *** influence of natural fractures on gas migration and well production in marine carbonates is discussed,and indicates that tectonic fractures could provide seepage channels for gas migration and accumulation from near or distant hydrocarbon source rocks into the Middle Triassic Leikoupo *** study utilizes a pragmatic approach for understanding the fracture genesis mechanism in oil and gas field with multiperiod fractures.

关键词： Multiperiod fractures Interaction relationships Genesis mechanism Gas migration Leikoupo formation Sichuan basin

Synthesis of spherical CoAl_2O_4 pigment particles with high reflectivity by polymeric-aerosol pyrolysis

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Rare Metals 2007年第3期26卷 236-241页

作者： hu Guorong deng Xinrong CAO Yanbing PENG Zhongdong School of Metallurgical Science and Engineering Central South University Changsha 410083 China

Spherical cobalt blue particles with good reflectivity characteristics were synthesized by spray pyrolysis. Two different spray solutions were prepared to investigate the differences in the morphology and the reflectivity properties of cobalt blue particles. One was an aqueous solution, and the other was a polycation solution that was obtained by chemically modifying the aqueous solution with NH4OH. The cobalt blue particles prepared with the aqueous solution had an irregular morphology after heat treatment at 1000~C for 2 h. On the contrary, spherical and dense particles were obtained from the polycation solution. The spherical and dense cobalt blue particles showed remarkable improvement in reflectivity compared with that of irregular morphology particles as well as the commercial.

关键词： inorganic compounds optical materials spray pyrolysis polymeric aerosol

Role of Epstein-Barr Virus Encoded Latent Membrane Protein 1 in the Carcinogenesis of Nasopharyngeal Carcinoma

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Cellular & Molecular Immunology 2007年第3期4卷 185-196页

作者： hui Zheng Lili Li Duosha hu Xiyun deng Ya Cao Cancer Research Institute Xiangya School of Medicine Central South University Changsha Hunan China

Epstein-Barr virus （EBV）-encoded latent membrane protein 1 （LMPI） has been known to have oncogenic properties during latent infection in nasopharyngeal carcinoma （NPC）. Our studies focused on the role of LMP1 in NPC, and showed that LMP1 triggers the NF-κB, AP-1 and STAT signaling pathways. Strikingly, LMP1 was found to mediate the formation of a new heterodimer between c-Jun and JunB. Also, we have identified JAK/STAT and PI-PLC-PKC activation triggered by LMP1 through upregulating the expression of JAK3 and enhancing the phosphorylation of STATo The constitutive activation of these signaling cascades explains LMP1＇s ability to induce such a diverse array of morphological and phenotypic effects in cells and provides insight into how LMP1 may induce cell transformation, in which multihit targeted genes in the downstream play an essential role. All signaling cascades triggered by LMP1 ultimately lead to the disruption of the cell cycle： the acceleration of G1/S phase and the arrest of G2/M phase. We also found that LMP1 induced the expression of hTERT and promoted cell immortalization. Importantly, by intervening physical intracellular signal transduction pathways and disturbing the progression of the cell cycle, LMP1, an important oncoprotein encoded by EBV, is thought to be a key modulator in the pathogenesis of NPC. Interfering LMP1 signaling could be a promising strategy to target the malignant phenotype of NPC. Cellular ＆ Molecular Immunology.

关键词： latent membrane protein 1 nasopharyngeal carcinoma signal transduction

Multi-stage Virtual Over-sample Digital Hystersis Control

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中国电机工程学报 2012年第36期32卷 I0001-I0022,21页

作者： hu Yihua deng Yan LIU Quanwei TAO Yong Zhejiang University

并网电流控制是分布式发电系统中的技术难点。在分析传统滞环控制策略的基础上，针对不对称多电平拓扑研究了一种分段式虚拟过采样并网滞环控制策略。通过将母线电压按正弦波形分段的方法，可以有效分配开关管开关频率，降低输出电流的... 详细信息

并网电流控制是分布式发电系统中的技术难点。在分析传统滞环控制策略的基础上，针对不对称多电平拓扑研究了一种分段式虚拟过采样并网滞环控制策略。通过将母线电压按正弦波形分段的方法，可以有效分配开关管开关频率，降低输出电流的谐波含量。在真实采样点之间插入虚拟采样点的虚拟过采样方法，解决了滞环控制中环宽失效问题。利用仿真软件对多种滞环控制策略进行对比分析，搭建实验平台对提出的算法进行实验验证。仿真与实验结果都验证了所提控制算法的正确性。

关键词：滞环控制采样数滞环电流控制分布式发电系统虚拟多级无差拍控制单周期控制

Dynamics of structural systems with various frequency-dependent damping models

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Frontiers of Mechanical Engineering 2015年第1期10卷 48-63页

作者： Li LI Yujin hu Weiming deng Lei LU Zhe DING School of MechaniCs alcience and Technology Science and Engineerinwu ghan 430074 ChinaHuazhang University of

The aim of this paper is to present the dynamic analyses of the system involving various damping models. The assumed frequency-dependent damping forces depend on the past history of motion via convolution integrals over some damping kernel functions. By choosing suitable damping kernel functions of frequency-dependent damp- ing model, it may be derived from the familiar viscoelastic materials. A brief review of literature on the choice of available damping models is presented. Both the mode superposition method and Fourier transform method are developed for calculating the dynamic response of the structural systems with various damping models. It is shown that in the case of non-deficient systems with various damping models, the modal analysis with repeated eigenvalues are very similar to the traditional modal analysis used in undamped or viscously damped systems. Also, based on the pseudo-force approach, we transform the original equations of motion with nonzero initial conditions into an equivalent one with zero initial conditions and therefore present a Fourier transform method for the dynamics of structural systems with various damping models. Finally, some case studies are used to show the application and effectiveness of the derived formulas.

关键词： damping viscoelasticity dynamic analysis,mode superposition method Fourier transform method

Colorectal cancer lymph node staining by activated carbon nanoparticles suspension in vivo or methylene blue in vitro

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World Journal of Gastroenterology 2012年第42期18卷 6148-6154页

作者： Hong-Ke Cai Hai-Fei He Wei Tian Mei-Qi Zhou Yue hu Yong-Chuan deng Department of Surgical Oncology SecondAffiliated Hospital Zhejiang University College of MedicineHangzhou 310009 Zhejiang Province China

AIM:To investigate whether activated carbon nanoparticles suspension(ACNS) or methylene blue(MB) can increase the detected number of lymph nodes in colorectal ***:Sixty-seven of 72 colorectal cancer patients treated at our hospital fulfilled the inclusion criteria of the study which was conducted from December 2010 to February *** patients refused to ***,60 patients were included,and randomly assigned to three groups(20 in each group):ACNS group(group A),MB group(group B) and non-stained conventional surgical group(group C).In group A,patients received subserosal injection of 1 mL ACNS in a 4-quadrant region around the *** group B,the main artery of specimen was identified and isolated after the specimen was removed,and 2 mL MB was slowly injected into the isolated,stretched and fixed *** group C,no ACNS and MB were *** the mesentery lymph nodes were isolated and removed systematically by visually inspecting and palpating the adipose ***:No difference was observed among the three groups in age,gender,tumor location,tumor diameter,T-stage,degree of differentiation,postoperative complications and peritoneal drainage retention *** total number of detected lymph nodes was 535,476 and 223 in the three groups,*** mean number of detected lymph nodes per patient was significantly higher in group A than in group C(26.8 ± 8.4 vs 12.2 ± 3.2,P < 0.001).Similarly,there were significantly more lymph nodes detected in group B than in group C(23.8 ± 6.9 vs 12.2 ± 3.2,P < 0.001).However,there was no significant difference between group A and group *** were 50,46 and 32 metastatic lymph nodes dissected in 13 patients of group A,10 patients of group B and 11 patients of group C,without significant differences among the three *** of the 60 patients had insufficient number of detected lymph nodes(< 12).Only one patient with T 4a rectal cancer had 10 lymph nodes detected in group B,the othe

关键词： Nanotechnology Activated carbon nanoparticles suspension Methylene blue Lymph nodes Colorectal cancer

The Variation and Stability Analysis of Wheat Dough Stability Time

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Agricultural Sciences in China 2007年第2期6卷 143-149页

作者： TIAN Ji-chun hu Rui-bo deng Zhi-ying WANG Yan-xun Key Laboratory of Crop Biology of Shandong Province~Group of Quality Wheat Breeding Shandong Agricultural University Taian271018 P.R.China

Farinograph dough stability time is an important index for classifying wheat, and it often indicates the most appropriate end use for the wheat cultivars. This study aimed at the problem of large fluctuations in dough stability time that occurs during the commercial wheat production. The variations in the dough stability time and its consistency across locations and years were analyzed using 12 principal high-quality wheat cultivars （varieties） obtained from Shandong Province, China, which were grown at nine different locations for three successive years. The results showed that the coefficient of variation for the dough stability time ranged from 24.29 to 49.60% across different varieties, locations, and years. Additive main effects and multiplicative interaction （AMMI） analysis indicated that there were significant interactions for the dough stability time between the varieties, the growth locations, and the years. The genotype effect was the most noticeable, followed by the interaction of the genotype and the environment. The environmental effect was the least significant. The interactions between the varieties and the locations differ considerably, however, each cultivar （variety） apparently has a specific adaptability to the growth location. Therefore, for the successful commercial scale production of the high-quality wheat varieties, both the selection of proper cultivars and its most suitable growth locations to meet the desired requirements for the dough mixing stability time are important.

关键词： Chinese wheat (Ttiticum aestivum) dough stability time genotype and environment stability analysis

Peak compression technique in high-performance liquid chromatography

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Chinese Science Bulletin 2009年第16期54卷 2805-2809页

作者： WEI YuXia WANG Lin XIAO ShengYuan QING Hong Zhu Yong hu GaoFei deng YuLin School of Life Science and Technology Beijing Institute of Technology Beijing 100081 China

Peak compression technique based on the difference of the solute migration velocity in two different mobile phases was described theoretically and confirmed using benzaldehyde and 4-hydroxyquinoline (4-HQ) as model compounds. After peak compression, the peak compression factors (the ratio of peak width at half-height under non-compression and that under compression condition) of benzaldehyde and 4-HQ were 0.19 and 0.13, respectively. By this application of the peak compression technique to the mixture, both enhanced peak height and good separation were obtained in one run cycle. This peak compression technique was introduced to determine benzaldehyde from semicarbazide-sensitive amine oxidase-catalyzed enzymetic reaction in order to illustrate the applicability of this technique to the real sample. As a result, the peak was compressed effectively, and 4.94-fold, 19.3-fold and 5.74-fold enhancement in peak height, plate number and signal to noise ratio were also achieved, respectively.

关键词：压缩技术高效液相色谱模型化合物脲甲醛迁移速度羟基喹啉压缩条件运行周期