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一种基于模糊图像处理的透镜快速测焦方法

光学学报 2015年第2期35卷 107-115页

作者：陈荣军谭洪舟谭伟清熊文婷朱雄泳中山大学信息科学与技术学院广东广州510006 中山大学南方学院广东广州510970 广东第二师范学院计算机科学系广东广州510000

焦距的精确测量直接关系到光学仪器的正常使用和技术性能的充分发挥。基于光学离焦成像模型,结合模糊图像处理快速算法,提出了一种新的实用性强的快速自动测焦方法。根据光学成像原理提出模糊图像条件下测焦原理的数学模型,运用最小二... 详细信息

焦距的精确测量直接关系到光学仪器的正常使用和技术性能的充分发挥。基于光学离焦成像模型,结合模糊图像处理快速算法,提出了一种新的实用性强的快速自动测焦方法。根据光学成像原理提出模糊图像条件下测焦原理的数学模型,运用最小二乘法拟合圆的图像处理算法计算模糊图像中两弥散光斑间的距离,利用这个距离值计算出透镜焦距。实验证明该方法能够以较高的精度估计出弥散光斑间的距离值,从而实现精准且快速的自动测焦。该方法只需一幅模糊图像,相对于传统的测焦方法,减少了计算量,提高了速度和可靠性,降低了系统的复杂度。

关键词：图像处理成像系统自动测焦模糊图像处理前景提取

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水合碳酸钬与碳酸铒晶体的合成

稀有金属材料与工程 2006年第A02期35卷 406-408页

作者：柳松马荣骏华南理工大学广东广州510640 长沙矿冶研究院湖南长沙410012

以碳酸氢铵为沉淀剂合成了水合碳酸钬与碳酸铒晶体。化学分析的结果表明,制备的碳酸钬与碳酸铒是水合正碳酸盐。运用X射线衍射、扫描电子显微镜、热重和红外吸收光谱研究了碳酸钬与碳酸铒的结构与性质。碳酸钬与碳酸铒是由许多微晶聚集... 详细信息

以碳酸氢铵为沉淀剂合成了水合碳酸钬与碳酸铒晶体。化学分析的结果表明,制备的碳酸钬与碳酸铒是水合正碳酸盐。运用X射线衍射、扫描电子显微镜、热重和红外吸收光谱研究了碳酸钬与碳酸铒的结构与性质。碳酸钬与碳酸铒是由许多微晶聚集而成的球状晶体:其晶体结构与文献中的水菱钇石型稀土碳酸盐结构相类似:红外吸收光谱数据显示其晶胞中存在着非等价的碳酸根离子,即双齿配位与单齿配位的碳酸根;其热分解过程中,没有稳定的中间产物。

关键词：碳酸钬碳酸铒晶体碳酸氢铵合成

The marriage of sealant agent between structure transformable silk fibroin and traditional Chinese medicine for faster skin repair

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Chinese Chemical Letters 2022年第3期33卷 1599-1603页

作者： rongjun Zhang Youbin Zheng Tianqing Liu Ning tang Lianzhi Mao Lihan Lin Jiahui Ye Luoyijun Xie Wenwen Hu Weiwei Wu Wenzhen Liao Miaomiao Yuan The Eighth Affiliated Hospital Sun Yat-sen UniversityShenzhen 518033China Institute of Molecular Medicine(IMM) Renji HospitalShanghai Jiao Tong University School of MedicineShanghai 200240China Department of Chemical Engineering and Russell Berrie Nanotechnology Institute Technion-Isr1ael Institute of TechnologyHaifa 3200003Israel School of Advanced Materials and Nanotechnology Interdisciplinary Research Center of Smart SensorsXidian UniversityXi'an 710126China Department of Nutrition and Food Hygiene School of Public HealthSouthern Medical UniversityGuangzhou 510515China

Fast skin repair is critical for less infection, less pain and high quality of life, which is still limited with undesirable rehabilitation speed and side effects. Currently, laser-activated silk sealant agent without suture and gauze has been demonstrated promising for fast skin repair taking advantage of its structural transformation after heating. Nevertheless, more efficient healing effects and less side effects of laseractivated silk sealant agent remains challenging due to absence of suitable photo-thermal materials and robust/biomimetic protein materials. In this work, the marriage between silk protein and Rehmanniae radix preparata(a kind of the traditional Chinese herb) has been demonstrated as a novel and effective way to achieve an excellent healing effect for skin repair. The non-toxicity, high photothermal conversion efficiency and healing mechanism are systematically studied and proved. This new methodology might shed a new light for combining dark traditional Chinese medicine and silk fibroin for advanced wound healing technology.

关键词： Rehmanniae radix preparata Silk fibroin Sealant agent Photo-thermal effect Skin repair

Numerical simulation of liquid core reduction in thin-slab continuous casting

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Baosteel Technical Research 2009年第1期3卷 15-21页

作者： WANG Yingchun ZHANG Li XU rongjun XU Hongwei Metallurgical Process Division Baosteel Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China

Thin-slab continuous casting and rolling technology is a process integrating casting and plastic deformation. In this study,targeting actions such as slab deformation and liquid core flows during the process of liquid core reduction on thin-slab continuous casting, suggests the fluid-solid coupling method should be used to research the characteristic and patterns of slab deformation during the liquid core reduction process, as well as research liquid core backflows. A material model of the slab shell was obtained through the high-temperature compression test of the cast steel. The analysis of the fluid-solid coupling simulation for liquid core reduction shows that slab deformation concentrates on the narrow side due to the existence of the liquid core. Meanwhile,the stress and strain increases with the increase of the reduction rate and slab thickness. The changing trends of stress and strain are identical under various conditions. The results demonstrate that using greater reduction at the upper part of the slab, which has a higher temperature and thinner slab,is beneficial to the quality of the slab. Moreover,the liquid core is extruded as the reduction is implemented. The quantity of the extrusion increases with the increase of reduction rate and the thickness of thinner shell, which leads to fluctuation of the mould level, making the operation more difficult.

关键词： thin-slab casting liquid core reduction fluid-solid coupling slab deformation liquid core backflow

Isolation and characterization of two marine algicidal bacteria against the Phaeocystis globosa

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Isolation and characterization of two marine algicidal bacte...

Full-polarization angular spectrum modeling of scattered light modulation

International Conference on Environmental Pollution and Public Health(EPPH 2012) Vol1

作者： rongjun Yan Pinghe Yin College of Chemical Engineering and Materials Zhejiang University of Technology Institute of Hydrobiology Jinan University

During a red tide survey of the Zhuhai Estuary in southern China, we isolated two bacteria strain, designated Y01 and Y04, which had potent algicidal effects on harmful algal bloom （HAB） species Phaeocystis globosa. Genetic identification was achieved by polymerase chain reaction amplification and sequence analysis of 16SrDNA. Sequence analysis showed that the most probable affiliation of Y01 and Y04 were to the genus Bacillus. Bacterial isolate Y01 and Y04 showed algicidal activity through a contact attack. This is the first report of algicidal bacteria against *** and the founding certain bacteria could play an important role in regulating the onset and development of HAB.

关键词： Phaeocystis globosa Algicidal bacteria 16S rDNA Bacillus Harmful algal blooms

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Photonics Research 2024年第3期12卷 485-490页

作者： rongjun SHAO CHUNXU DING YUAN QU LINXIAN LIU QIAOZHI HE YUEJUN WU JIAMIAO YANG School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Institute of Marine Equipment Shanghai Jiao Tong UniversityShanghai 200240China School of Automation and Software Engineering Shanxi UniversityTaiyuan 030006China

The exact physical modeling for scattered light modulation is critical in phototherapy,biomedical imaging,and free-space optical *** particular,the angular spectrum modeling of scattered light has attracted considerable attention,but the existing angular spectrum models neglect the polarization of photons,degrading their ***,we propose a full-polarization angular spectrum model(fpASM)to take the polarization into *** model involves a combination of the optical field changes and free-space angular spectrum diffraction,and enables an investigation of the influence of polarization-related factors on the performance of scattered light *** establishing the relationship between various model parameters and macroscopic scattering properties,our model can effectively characterize various depolarization *** a demonstration,we apply the model in the time-reversal data transmission and anti-scattering light *** method allows the analysis of various depolarization scattering events and benefits applications related to scattered light modulation.

关键词： scattered angular spectrum

Oxidation Performance of Ytterbium Disilicate/Silicon Environmental Barrier Coating via Optimized Air Plasma Spraying

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Journal of Materials Science and Chemical Engineering 2021年第4期9卷 19-26页

作者： Yingjie Jian Yanfei Wang rongjun Liu Fan Wan Science and Technology on Advanced Ceramic Fibers and Composites Laboratory National University of Defense Technology Changsha China

Environmental barrier coatings (EBCs) play a critical role in mitigating the degradation of SiCf/SiC ceramic matrix composites (CMCs) in complex combustion environment, and improve the service life of thermal engine components. In this paper, by adjusting the parameters of atmospheric plasma spraying (APS), the spraying process of ytterbium disilicate (Yb2Si2O7) under a lower power has been optimized. A two-layer EBC system consisting of ytterbium disilicate and silicon is prepared on the SiCf/SiC composite substrate by using optimized technological parameters. The thermal resistance and water oxygen corrosion resistance of such two-layer EBC system are investigated. The results indicate that the current ytterbium disilicate/silicon EBC system exhibits good phase stability, excellent water vapor and oxygen corrosion resistance. However, the exposed silicon bonding layer tends to generate an excessive thermal growth oxide (TGO) layer known as SiO2, leading to an early spallation of the coating.

关键词： Environmental Barrier Coating Air Plasma Spraying Ytterbium Disilicate SiCf/SiC Composites

Normalization of ventral tegmental area structure following acupuncture in a rat model of heroin relapse

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Neural Regeneration Research 2014年第3期9卷 301-307页

作者： rongjun Zhang Xinghui Cai Xiaoge Song Chaoyang Dong Xiaorong Hou Lei Lv Anhui University of Chinese Medicine Anhui Academy of Medical Sciences

Drugs can cause obvious damage to the brain. To verify the relationship between acupuncture, neurotrophic factor expression and brain cell structural changes, this study established a rat model of heroin relapse using intramuscular injection of increasing amounts of heroin. During the detoxification period, rat models received acupuncture at Baihui （DU20） and Dazhui （DU14）. Electron microscopy demonstrated that the structure of the ventral tegmental area in heroin relapse rats gradually became normalized after acupuncture treatment. Immunohistochem- ical staining exhibited that the expression of brain-derived neurotrophic factor and glial cell line-derived neurotrophic factor increased in the ventral tegmental area following acupuncture. Moreover, the effects were similar to that of methadone, a type of medicine called an opioid. Results suggested that acupuncture at Baihui and Dazhui protected brain neurons against injury in rats with heroin relapse by promoting brain-derived neurotrophic factor and glial cell line-de-rived neurotrophic factor expression.

关键词： nerve regeneration acupuncture and moxibustion heroin relapse rats neurotrophic fac-tor nerve cell ultrastructure acupuncture midbrain Dazhui (DU14) Baihui (DU20) NSFC grant neural regeneration

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全地形车车架的动态性能分析与减振研究

中国机械工程 2008年第12期19卷 1508-1511页

作者：朱茂桃蔡炳芳束荣军谭建华江苏大学镇江212013 江苏圆通运动车业有限公司镇江212325

通过建立全地形车车架的有限元模型,进行模态分析,得到车架振动的固有频率,结合发动机的运行特性,分析其振动对车架动态性能的影响,并由谐响应分析得到车架各部位的振动情况,提出避免发动机与车架共振的方案,分析计算得到橡胶减振器的参... 详细信息

通过建立全地形车车架的有限元模型,进行模态分析,得到车架振动的固有频率,结合发动机的运行特性,分析其振动对车架动态性能的影响,并由谐响应分析得到车架各部位的振动情况,提出避免发动机与车架共振的方案,分析计算得到橡胶减振器的参数,对比减振前后的车架位移响应幅值,结合道路试验证明了该减振方案的合理性。

关键词：全地形车车架模态分析谐响应分析动态性能减振