检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

直流网光伏系统多时间尺度调度算法

电力建设 2024年第1期45卷 125-137页

作者：叶清泉倪佳华吴旭光陈伟吴明启项基国网浙江省电力有限公司平阳县供电公司浙江省温州市325400 浙江大学电气工程学院杭州市310015 平阳县昌泰电力实业有限公司浙江省温州市325400 浙江大学工程师学院杭州市310027

随着光伏渗透率的增加,从电网经济性和稳定性的角度考量,调度光伏的需求也愈发强烈。然而,传统电网调度都是基于可用容量固定的发电设备,对于光伏的调度则需要考虑实际可用容量不确定性变化带来的影响。目前的调度算法都是将光伏可用容... 详细信息

随着光伏渗透率的增加,从电网经济性和稳定性的角度考量,调度光伏的需求也愈发强烈。然而,传统电网调度都是基于可用容量固定的发电设备,对于光伏的调度则需要考虑实际可用容量不确定性变化带来的影响。目前的调度算法都是将光伏可用容量的不确定性量化为概率函数或可放缩的变量处理,或是用训练后的模型自适应光伏波动,无法实现对光伏功率偏差的准确响应。因此,提出了一种多时间尺度的光伏调度算法,在长时间尺度上,用集中式算法根据最优潮流模型求解网损最小和平均电压最小的光伏调度策略;在短时间尺度上,用分布式一致性算法实现功率偏差在各光伏电源之间的平均分担,以备用功率补足功率偏差。给出了集中式算法的潮流模型及其基于二阶锥松弛的凸优化模型,以及分布式算法的实现原理和伪代码。最后,在标准IEEE-5节点和IEEE-14节点系统上进行了功能验证。

关键词：光伏调度多时间尺度直流系统集中式调度分布式调度

An niR photothermal-responsive hybrid hydrogel for enhanced wound healing

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2022年第10期7卷 162-172页

作者： Lin Jin Xiaoqing Guo Di Gao Yan Liu jiahua ni Zhiming Zhang Yiqiao Huang Guibin Xu Zhe Yang Xingcai Zhang Xianhan Jiang Department of Urology The Fifth Affiliated Hospital of Guangzhou Medical UniversityGuangzhou510700PR China International Joint Research Laboratory for Biomedical Nanomaterials of Henan Zhoukou Normal UniversityZhoukou466001PR China The Key Laboratory of Biomedical Information Engineering of Ministry of Education School of Life Science and TechnologyXi’an Jiaotong UniversityXi’an710049PR China School of Engineering and Applied Sciences Harvard UniversityCambridgeMA02138USA School of Engineering Massachusetts Institute of TechnologyCambridgeMA02139USA Research Institute of Xi’an Jiaotong University HangzhouZhejiang311200PR China

Moderately regulating vascularization and immune microenvironment of wound site is necessary to achieve scarless wound healing of the ***,we have prepared an angiogenesis-promoting and scar-preventing band-aid with a core-shell structure,that consists of MXene-loaded nanofibers(MNFs)as the core and dopamine-hyaluronic acid hydrogel(H)as the shell(MNFs@V-H@DA)to encapsulate a growth factor(vascular endothelial growth factor,VEGF,abbreviated as V)and H2S donor(diallyl trisulfide,DATS,abbreviated as DA).The continuous release of DA from this system produced H2S,which would successfully induce macrophages to polarize into M2-lile phenotype,regulating the immune microenvironment and inhibiting an excessive inflammatory response at the wound *** is conducive to the proliferation of skin cells,facilitating the wound *** addition,an appropriate amount of VEGF can be released from the MXene nanofibrous skeleton by adjusting the time of near-infrared(niR)light exposure,preventing excessive neovascularization and extracellular matrix deposition at the wound ***,this niR photothermal-responsive band-aid achieved scarless wound healing through gradient-controlled vascularization and a related immune sequential reaction of damaged skin tissue.

关键词： Angiogenesis promotion niR response Hydrogel Nanofibers Scarless wound healing

Evaluation of channel-like porous-structured titanium in mechanical properties and osseointegration

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第9期44卷 160-170页

作者： Dong Wang Guo He Ye Tian ning Ren jiahua ni Wei Liu Xianlong Zhang School of Mechanical and Electrical Engineering Henan University of TechnologyZhengzhou 450001China Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Orthopaedics Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai 200233China

The porous titanium with a channel-like pore structure fabricated by infiltration casting followed by selectively dissolving the precursor woven three dimensional(3D)structure technique was comprehensively investigated by means of mechanical tests,in vitro and in vivo *** porous structure exhibited superiority in compressive,tensile strength and *** 40%porosity,the average compressive and tensile strength reached about 145MPa and 85 MPa,which was superior to that of other porous titanium,e.g.,Selective Laser Melting or powder sintered ones,and was comparable to that of the human cortical *** any bioactive surface treatment,this porous titanium exhibited good cell adhesion,rapid cell proliferation and excellent *** on the study,the 0.4mm pore size resulted in the most rapid cell proliferation and the maximal BV/TV ratio and trabecular bone number of the new bone that ingrew into the porous *** balance the excellent osseointegration and adequate mechanical properties,the optimal structural parameters were 0.4mmpore size with 40%*** porous titanium is very promising for orthopedic applications where compressive and tensile load-bearing is extremely important.

关键词： IC-SDPS technique Porous titanium implants Tensile strength Biocompatibility Osseointegration

Controlled release of hydrogen by implantation of magnesium induces P53-mediated tumor cells apoptosis

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2022年第3期7卷 385-396页

作者： Rui Zan Hao Wang Weijie Cai jiahua ni Berengere J.C.Luthringer-Feyerabend Wenhui Wang Hongzhou Peng Weiping Ji Jun Yan Jiazeng Xia Yang Song Xiaonong Zhang State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Institute of Metallic Biomaterials Department of Biological CharacterisationHelmholtz-Zentrum Geesthacht(HZG)Geesthacht21502Germany Department of General Surgery and Translational Medicine Center Wuxi No.2 People’s HospitalAffiliated Wuxi Clinical College of Nantong UniversityJiangsu214002China Orthopaedic Department Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai200233China Department of General Surgery Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai200233China Suzhou Origin Medical Technology Co.Ltd. Suzhou215513China

Hydrogen has been used to suppress tumor growth with considerable *** of hydrogen gas and oral ingestion of hydrogen-rich saline are two common systemic routes of hydrogen *** have developed a topical delivery method of hydrogen at targeted sites through the degradation of magnesium-based ***,the underlying mechanism of hydrogen’s role in cancer treatment remains ***,we investigate the mechanism of tumor cell apoptosis triggered by the hydrogen released from magnesium-based *** find that the localized release of hydrogen increases the expression level of P53 tumor suppressor proteins,as demonstrated by the in vitro RNA sequencing and protein expression ***,the P53 proteins disrupt the membrane potential of mitochondria,activate autophagy,suppress the reactive oxygen species in cancer cells,and finally result in tumor *** anti-tumor efficacy of magnesium-based biomaterials is further validated in vivo by inserting magnesium wire into the subcutaneous tumor in a *** also discovered that the minimal hydrogen concentration from magnesium wires to trigger substantial tumor apoptosis is 91.2μL/mm^(3)per day,which is much lower than that required for hydrogen *** together,these findings reveal the release of H2 from magnesium-based biomaterial exerts its anti-tumoral activity by activating the P53-mediated lysosome-mitochondria apoptosis signaling pathway,which strengthens the therapeutic potential of this biomaterial as localized anti-tumor treatment.

关键词： Biodegradable magnesium Hydrogen Tumor apoptosis Underlying mechanism P53

Site-Dependent Osseointegration of Biodegradable High-Purity Magnesium for Orthopedic Implants in Femoral Shaft and Femoral Condyle of New Zealand Rabbits

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2016年第9期32卷 883-888页

作者： Pengfei Cheng Changli Zhao Pei Han jiahua ni Shaoxiang Zhang Xiaonong Zhang Yimin Chai Orthopaedic Department Shanghai Jiao Tong University Affiliated Sixth People's HospitalShanghai 200233China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai fiao Tong UniversityShanghai 200240China Suzhou Origin Medical Technology Co.Ltd. Suzhou 215513China

Magnesium （Mg） has been widely accepted as osteoconductive biomaterial, but osseointegration of Mg device at different implantation sites is still unclear. In the present study, high-purity magnesium （HP Mg） pins were implanted into femoral shaft and condyle of New Zealand rabbits concurrently. 2, 8, 12 and 16 weeks after surgery, rabbit femurs were harvested for micro-computed tomography （micro-CT） scanning and subsequent histological examinations. HP Mg pins were retrieved for scanning electron microscope and energy dispersive spectrum （SEM/EDS） analyses. HP Mg pins at both implantation sites performed stable corrosion with mineral deposition and bone incorporation on surface. However, difference in distribution of contact osteogenesis centers and biological properties of peri-implant bone tissues was detected between femoral shaft and femoral condyle. In femoral condyle, contact osteogenesis centers originated from both periosteum and cancellous bones and the whole HP Mg pin was encapsuled in trabecular bone at 16 weeks. Meanwhile, bone volume to total bone volume （BV/TV） and bone mineral density （BMD） of peri-implant bone tissues were above those of normal bone tissues. In femoral shaft, contact osteogenesis centers were only from periosteum and direct bone contact was confined in cortical bone, while BV/TV and BMD kept lower than normal. Furthermore, new formation of peri-implant bone tissues was more active in femoral condyle than in femoral shaft at 16 weeks. Therefore, although HP Mg performed good biocompatibility and corrosion behavior in vivo, its bioadaption of osseointegration at different implantations sites should be taken into consideration. Bone metaphysic was suitable for Mg devices where peri-implant bone tissues regenerated rapidly and the biological properties were close to normal bone tissues.

关键词： Osseointegration High-purity magnesium Site-dependent Femoral shaft and condyle Bioadaption

在线全文

学校读者我要写书评

暂无评论

直流微网下的光伏可调度下垂控制方法

电网技术 2023年第11期47卷 4619-4628页

作者：倪佳华项基李艳君赵波浙江大学电气工程学院浙江省杭州市310014 浙江大学城市学院浙江省杭州市310014 国网浙江省电力有限公司电力科学研究院浙江省杭州市310014

为了提升光伏调度的灵活性,并解决传统基于U-I下垂的光伏控制方法中的过载问题,提出了以U-dp/du下垂控制为第1层,以调度指令跟踪为第2层的分层可调度下垂控制方法。在不同的时间尺度上,实现了不同的控制目标。在短时间尺度上,U-dp/du下... 详细信息

为了提升光伏调度的灵活性,并解决传统基于U-I下垂的光伏控制方法中的过载问题,提出了以U-dp/du下垂控制为第1层,以调度指令跟踪为第2层的分层可调度下垂控制方法。在不同的时间尺度上,实现了不同的控制目标。在短时间尺度上,U-dp/du下垂控制可以在光伏电源之间分担瞬态功率波动;在长时间尺度上,跟踪调度指令以实现电压控制或功率调节。而且,以dp/du作为控制变量实现了光伏运行模式的无缝切换,不仅避免了过载问题,还能作为调度中的功率裕量指标。最后,在硬件在环实验中验证了所提算法的有效性。

关键词：光伏系统可调度分层控制下垂控制直流微网

Study of Cell Behaviors on Anodized TiO_2 Nanotube Arrays with Coexisting Multi-Size Diameters

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2016年第1期8卷 61-69页

作者： Yifan Chen jiahua ni Hongliu Wu Ruopeng Zhang Changli Zhao Wenzhi Chen Feiqing Zhang Shaoxiang Zhang Xiaonong Zhang State Key Laboratory of Metal Matrix Composites School of Material Science and Engineering Shanghai Jiao Tong University Suzhou Origin Medical Technology Co. Ltd.

It has been revealed that the different morphologies of anodized TiO_2 nanotubes, especially nanotube diameters, triggered different cell behaviors. However, the influence of TiO_2 nanotubes with coexisting multi-size diameters on cell behaviors is seldom reported. In this work, coexisting four-diameter TiO_2 nanotube samples, namely,one single substrate with the integration of four different nanotube diameters(60, 150, 250, and 350 nm), were prepared by repeated anodization. The boundaries between two different diameter regions show well-organized structure without obvious difference in height. The adhesion behaviors of MC3T3-E1 cells on the coexisting fourdiameter TiO_2 nanotube arrays were investigated. The results exhibit a significant difference of cell density between smaller diameters(60 and 150 nm) and larger diameters(250 and 350 nm) within 24 h incubation with the coexistence of different diameters, which is totally different from that on the single-diameter TiO_2 nanotube arrays. The coexistence of four different diameters does not change greatly the cell morphologies compared with the singlediameter nanotubes. The findings in this work are expected to offer further understanding of the interaction between cells and materials.

关键词： Coexisting multi-size TiO2 nanotubes Repeated anodization MC3T3-E1 cells Cell adhesion behaviors Cell-material interaction

Doping inorganic ions to regulate bioactivity of Ca–P coating on bioabsorbable high purity magnesium

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2014年第5期24卷 479-485页

作者： Hongliu Wu Ruopeng Zhang Xiao Li jiahua ni Changli Zhao Yang Song Jiawei Wang Shaoxiang Zhang Yufeng Zheng Xiaonong Zhang State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Department of Mechanical Engineering The University of Hong Kong Suzhou Origin Medical Technology Co. Ltd. 4. State Key Laboratory for Turbulence and Complex System Department of Materials Science and EngineeringCollege of EngineeringPeking University

Performance of biomaterials was strongly affected by their surface properties and could be designed artificially to meet specific biomedical requirements. In this study, F(F), Si O2 4(Si), or HCO 3(C)-doped Ca–P coatings were fabricated by biomimetic deposition on the surface of biodegradable high-purity magnesium(HP Mg). The crystalline phases, morphologies and compositions of Ca–P coatings had been characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM) and energy-dispersive spectroscopy(EDS). The biomineralization and corrosion resistance of doped Ca–P coatings had also been investigated. The results showed that the Ca–P coating with or without doped elements mainly contained the plate-like dicalcium phosphate dehydrate(DCPD) phase. The doped F, Si, or C changed the surface morphology of Ca–P coatings after mineralization. Doped F enhanced the mineralization of Ca–P coating, and doped Si retarded the mineralization of Ca–P ***, H2 evolution of HP Mg discs with different Ca–P coatings was close to 0.4–0.7 ml/cm2 after two-week immersion. That meant that the corrosion resistance of the Ca–P coatings with different or without doped elements did not change significantly.

关键词： Calcium phosphate coating Adjustable bioactivity Magnesium Biomimetic deposition In vitro

Research of a novel biodegradable surgical staple made of high purity magnesium

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Bioactive Materials 2016年第2期1卷 122-126页

作者： Hongliu Wu Changli Zhao jiahua ni Shaoxiang Zhang Jingyi Liu Jun Yan Yigang Chen Xiaonong Zhang State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Suzhou Origin Medical Technology Co.Ltd. Jiangsu 215513China Department of General Surgery Shanghai Jiao Tong University Affiliated Sixth People's HospitalShanghai200233China Department of General Surgery Wuxi No.2 People's HospitalNanjing Medical UniversityWuxi214002China

Surgical staples made of pure titanium and titanium alloys are widely used in gastrointestinal *** the Ti staple cannot be absorbed in human body and produce artifacts on computed tomography(CT)and other imaging examination,and cause the risk of incorrect *** bioabsorbable staple made from polymers that can degrade in human body environment,is an *** the present study,biodegradable high purity magnesium staples were developed for gastric anastomosis.U-shape staples with two different interior angles,namely original 90and modified 100,were *** element analysis(FEA)showed that the residual stress concentrated on the arc part when the original staple was closed to B-shape,while it concentrated on the feet for the modified staple after *** in vitro tests indicated that the arc part of the original staple ruptured firstly after 7 days immersion,whereas the modified one kept intact,demonstrating residual stress greatly affected the corrosion behavior of the HP-Mg *** in vivo implantation showed good biocompatibility of the modified Mg staples,without inflammatory reaction 9 weeks *** Mg staples kept good closure to the Anastomosis,no leaking and bleeding were found,and the staples exhibited no fracture or severe corrosion cracks during the degradation.

关键词： Biodegradable staple High purity magnesium Finite element analysis Corrosion In vivo