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A switched MPC approach of hybrid system for demand side management 36

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A switched MPC approach of hybrid system for demand side man...

Preparation and characterization of polystyrene-based monolith with ordered macroporous structure

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作者： Xu Han Nian Ao zhou wu College of Automation Chongqing University

ISBN: (纸本)9781538629185

The grid-connected photovoltaic-battery hybrid system is widely used in modern *** on the hybrid system,customers’ energy demand can be satisfied by renewable energy or battery,then their electricity cost can be *** disturbances on solar energy and load demand occurred,pre-designed control strategy cannot fit system requirements in terms of optimality and *** this paper,model predictive control（MPC） is proposed as a closed-loop control approach to achieve real time *** with the open-loop control approach,MPC has great performance improvement in terms of stability and efficiency.

关键词： hybrid system open-loop control MPC disturbances

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Chinese Chemical Letters 2012年第4期23卷 474-477页

作者： Quan zhou wu Jian Feng He Ji Ming Ou College of Chinese Materia Medica Guangzhou University of Chinese MedicineGuangzhou 510006China

In this paper,polystyrene-based monoliths with highly ordered macroporous structure were synthesized by using SiO_2 colloidal crystal as *** observation shows that the macropores are highly ordered and are interconnected by small *** BET surface area of PS monolith is about 36.17 m^2/*** polymer monoliths can resist 5 MPa pressure,showing high mechanical and compressive strength.

关键词： Monolith Polystyrene Polymer Ordered macropore

Metformin alleviates spinal cord injury by inhibiting nerve cell ferroptosis through upregulation of heme oxygenase-1 expression

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Neural Regeneration Research 2024年第9期19卷 2041-2049页

作者： Zhihua Wang wu zhou Zhixiong Zhang Lulu Zhang Meihua Li Department of Neurosurgery The First Affiliated Hospital of Nanchang UniversityNanchangJiangxi ProvinceChina Postdoctoral Innovation Practice Base The First Affiliated Hospital of Nanchang UniversityNanchangJiangxi ProvinceChina Department of Nephrology Nanchang People’s Hospital Affiliated to Nanchang Medical CollegeNanchangJiangxi ProvinceChina

Previous studies have reported upregulation of heme oxygenase-1 in different central nervous system injury *** oxygenase-1 plays a critical anti-inflammatory role and is essential for regulating cellular redox *** is a classic drug used to treat type 2 diabetes that can inhibit *** studies have shown that,when used to treat cardiovascular and digestive system diseases,metformin can also upregulate heme oxygenase-1 ***,we hypothesized that heme oxygenase-1 plays a significant role in mediating the beneficial effects of metformin on neuronal ferroptosis after spinal cord *** test this,we first performed a bioinformatics analysis based on the GEO database and found that heme oxygenase-1 was upregulated in the lesion of rats with spinal cord ***,we confirmed this finding in a rat model of T9 spinal cord compression injury that exhibited spinal cord nerve cell *** intraperitoneal injection of metformin for 14 days was found to both upregulate heme oxygenase-1 expression and reduce neuronal ferroptosis in rats with spinal cord ***,we used a lentivirus vector to knock down heme oxygenase-1 expression in the spinal cord,and found that this significantly reduced the effect of metformin on ferroptosis after spinal cord *** together,these findings suggest that metformin inhibits neuronal ferroptosis after spinal cord injury,and that this effect is partially dependent on upregulation of heme oxygenase-1.

关键词： acyl-CoA synthetase long-chain family member 4 ferroptosis glutathione peroxidase 4 heme oxygenase-1 inflammation iron lipid peroxidation metformin neuroprotection spinal cord injury

3D particle streak velocimetry by defocused imaging

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Particuology 2023年第1期72卷 1-9页

作者： Xiangrui Dong Xiaoxiao Wang wu zhou Fangting Wang Xinran Tang Xiaoshu Cai School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer for Power Engineering Shanghai 200093China

Particle streak velocimetry (PSV) has become one of the important branches of flow filed measurements. It extracts velocity information from particle trajectories captured by single frame long exposure images. Since the defocus of moving particle is inevitable during a long exposure time and under a large magnification, a novel three-dimensional (3D) velocity measurement method named defocusing particle streak velocimetry (DPSV) is proposed in this paper. On the one hand, an extension from two-dimensional (2D) to 3D velocity measurement with a monocular system is carried out. The depth information of the particle, which reflects the position in the third dimension, is indicated by the defocusing degree (characteristic parameter σ) of the particle images. The variation of σ along the trajectory is recognized by surface fitting of the gray value distribution of particle images, assuming that σ varies linearly along the trajectory. On the other hand, based on the linear fitting for the straight trajectory, an arc fitting model is developed for curved trajectories which are commonly captured in turbulent flow. The relationship between σ and the particle depth position z is experimentally calibrated using a LED light and a diaphragm. Finally, the DPSV method is verified in a submerged jet flow field as well as in a microchannel flow field to obtain the 3D velocity field with single monocular system.

关键词： Defocusing particle streak velocimetry Curve trajectory Three-dimensional velocity Gray value distribution

Reconstruction of particle distribution for tomographic particle image velocimetry based on unsupervised learning method

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Particuology 2024年第10期93卷 349-363页

作者： Duanyu Zhang Haoqin Huang wu zhou Mingjun Feng Dapeng Zhang Limin Gao School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer for Power Engineering University of Shanghai for Science and TechnologyShanghai200093China National Key Laboratory of Aerodynamic Design and Research Northwestern Polytechnical UniversityXi'an710072China

The development of deep learning has inspired some new methods to solve the 3D reconstruction problem for Tomographic Particle Image Velocimetry (Tomo-PIV). However, the supervised learning method requires a large number of data with ground truth as training information, which is very difficult to gather from experiments. Although synthetic datasets can be used as alternatives, they are still not exactly the same with the real-world experimental data. In this paper, an Unsupervised Reconstruction Technique based on U-net (UnRTU) is proposed to reconstruct volume particle distribution explicitly. Instead of using ground truth data, a projection function is used as an unsupervised loss function for network training to reconstruct particle distribution. The UnRTU was compared with some traditional algebraic reconstruction algorithms and supervised learning method using synthetic data under different particle density and noise level. The results indicate that UnRTU outperforms these traditional approaches in both reconstruction quality and noise robustness, and is comparable to the supervised learning methods AI-PR. For experimental tests, particles dispersed in cured epoxy resin are moved by an electric rail with a certain speed to obtain the ground truth data of particle velocity. Compared with other algorithms, the reconstructed particle distribution by UnRTU has the best reconstruction fidelity. And the accuracy of the 3D velocity field estimated by UnRTU is 12.9% higher than that from the traditional MLOS-MART algorithm. It demonstrates significant potential and advantages for UnRTU in 3D reconstruction of particle distribution. Finally, UnRTU was successfully applied to the high-speed planar cascade airflow field, demonstrating its applicability for measuring complex fluid flow fields at higher particle density.

关键词： Tomographic particle image velocimetry 3D reconstruction Unsupervised learning Convolutional neural network

STATISTICAL PROPERTY OF THRESHOLD-CROSSING FOR ZERO-MEAN-VALUED, NARROW-BANDED GAUSSIAN PROCESSES

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Applied Mathematics and Mechanics(English Edition) 2001年第6期22卷 701-710页

作者： HE wu-zhou(贺五洲) YUAN Ming-shun(苑明顺) Department of Hydraulic and Hydropower Engineering Tsinghua University Beijing 100084 P R China Department of Hydraulic and Hydropower Engineering Tsinghua University Beijing 100084 P R China

Based on a comprehensive discussion of the calculation method for the threshold-crossing statistics of zero mean valued, narrow banded Gaussian processes of various practical engineering problems, including the threshold-crossing probability, average number of crossing events per unit time, mean threshold-crossing duration and amplitude, a new Simple numerical procedure is proposed for the efficient evaluation of mean threshold-crossing duration. A new dimensionless parameter, called the threshold-crossing intensity, is defined as a measure of the threshold-crossing severity, which is equal to the ratio of the product of average number of crossing events per unit time and mean threshold-crossing duration and amplitude over the threshold. It is found, by the calculation results for various combinations of stochastic processes and different thresholds, that the threshold-crossing intensity, irrelevant of the threshold and spectral density of the process, is dependent only on the threshold-crossing probability.

关键词： stochastic process threshold-crossing statistical property

Spectrophotometric Determination of Trace Chromium(VI) in Mass Chromium(III)

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Chinese Chemical Letters 2001年第7期12卷 635-636页

作者： Zi Gang XU Xian Hong WEN Qing zhou wu Center of Analysis&Testing Zhejiang UniversityHangzhou 310027

The method for the sepration and determination of trace Cr(VI) exiting in mass Cr(III) has been researched. The method is highly sensitive and less interference, but is simple and useful for analysis trace Cr(VI).

关键词： Spectrophotometric Cr(VI) Cr(III) diphenyl carbazide(DPC) 4-methyl-benzene sulfonic acid

Mathematic Model of SEN Clogging During Continuous Casting of Steel

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Journal of Iron and Steel Research International 2010年第8期17卷 6-9页

作者： wu Su-zhou ZHANG Jiong-ming LI Zhi-zheng School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The SEN clogging is a serious problem for continuous casting operation and steel *** kinetics mathematic model of SEN clogging during steel continuous casting is *** fluid flow and inclusions motion are calculated by means of mathematic *** of diameters of inclusions,roughness of nozzle,diameter of nozzle and casting speed on the entrapment probability are calculated and *** result shows that inclusions are more easily to attach to the nozzle by the following condition：smaller inclusion size,larger roughness of the wall and the smaller bulk velocity in the nozzle.

关键词： nozzle clogging mathematic model inclusion motion

A coordinated consistency voltage stability control method of active distribution grid

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Journal of Modern Power Systems and Clean Energy 2018年第1期6卷 85-94页

作者： Xi YE Jian LE Yongyan LIU wu zhou Kaipei LIU College of Electrical Engineering Wuhan University

The presence of distributed generators(DGs)with high penetration poses new challenges in the management and operation of electrical *** to the local character of DGs,they could in principle be used in emergency situations to prevent a voltage instability event of the *** this paper,a certain method is proposed to coordinate the operation of virtual power plant(VPP)and conventional voltage regulation device to improve the static voltage stability of distribution network with the multi-agent *** concept and the general framework of this coordinated control system is introduced,and the voltage instable nodes are determined based on the voltage instability *** voltage coordinated control model of the distribution system is established according to the multi-agent consistency control theory and the coordinated controllers for agents are designed by solving a problem with bilinear matrix inequality *** suggested method is implemented on an IEEE 33 nodes test system and the simulation results show its efficiency and validity.

关键词： Virtual power plant Distributed generation Coordinated consistency control Static voltage stability