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Survey of 3D modeling using depth cameras

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Virtual Reality & Intelligent Hardware 2019年第5期1卷 483-499页

作者： Hantong xu jiamin xu Weiwei xu State Key Lab of CAD&CG Zhejiang UniversityHangzhou 310058China

Three-dimensional(3D)modeling is an important topic in computer graphics and computer *** recent years,the introduction of consumer-grade depth cameras has resulted in profound advances in 3D *** with the basic data structure,this survey reviews the latest developments of 3D modeling based on depth cameras,including research works on camera tracking,3D object and scene reconstruction,and high-quality texture *** also discuss the future work and possible solutions for 3D modeling based on the depth camera.

关键词： 3D Modeling Depth camera Camera tracking Signed distance function Surfel

Influence of Pd deposition pH value on the performance of Pd-CuO/SiO_(2) catalyst for semi-hydrogenation of 2-methyl-3-butyn-2-ol(MBY)

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Chinese Chemical Letters 2022年第1期33卷 349-353页

作者： jiamin xu Xiaowen Guo Yejun Guan Peng Wu Shanghai Key Laboratory of Green Chemistry and Chemical Processes East China Normal UniversityShanghai 200062China

The selective hydrogenation of C≡C to C=C bonds is an important step,yet remains to be a great challenge in chemical *** this study,we have revealed the influence of Pd deposition pH value on the catalytic performance of Pd-CuO/SiO_(2)catalyst for the semi-hydrogenation of 2-methyl-3-butyn-2-ol(MBY).Trace amount of Pd(about 500 ppm)was loaded via deposition-reduction method on CuO/SiO_(2)support by using H_(2)PdCl_(4) solution as precursor and NaBH_(4)as reductant,*** pH value at which Pd was deposited was adjusted to about 5 and 7 by adding NaOH *** obtained catalysts were characterized by several techniques including XRD,TEM,H_(2)-TPR,*** the case of pH value of 5,the CuO was partially dissolved during the deposition and then co-reduced with Pd^(2+)by NaBH_(4),forming PdCu alloy structure in *** contrast,no PdCu alloy structure was observed when pH value was *** kinetics of MBY semi-hydrogenation over both catalysts were *** former PdCu alloy catalyst showed very high selectivity towards the semi-hydrogenation of MBY due to its low activity in hydrogenation of C=C bond in 2-methyl-3-buten-2-ol(MBE).The results herein demonstrated that the pH value where Pd was deposited played a crucial role in determining the catalytic performance of PdCu catalyst.

关键词： Alkynols Palladium Semi-hydrogenation Alloy Copper

Advancing microarray fabrication:One-pot synthesis and highresolution patterning of UV-crosslinkable perovskite quantum dots

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Nano Research 2024年第9期17卷 8600-8609页

作者： Linfeng Yuan Dejian Chen Kun He jiamin xu Kunyuan xu Jie Hu Sisi Liang Haomiao Zhu CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China University of Chinese Academy of Sciences Beijing 100049China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Research Center of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021China

The development of highly efficient,solution-processable,and environmentally stable perovskite quantum dots(PQDs)is crucial for their accurate high-resolution patterning and subsequently enabling the practical deployment of PQD based emissive display *** study presents an innovative strategy for integrating all-inorganic PQDs and ultraviolet(UV)crosslinkable acrylate polymer at a structural and functional *** achievement is accomplished by meticulous design and one-pot synthesis of UV-crosslinkable CsPbX_(3)(X=Cl,Br,I)PQDs solution,which exhibit outstanding environmental *** the solution-processable characteristics of the resulting UV-crosslinkable PQDs,precise patterning of high-resolution(2μm,7608 pixels·in.^(-1))and colorful PQDs microarrays can be readily achieved through inkjet printing and high-throughput photolithography(~2μm in pitch line/space patterning).The UV cross-linked process guarantees a homogeneous distribution of PQDs,effectively mitigating coffee ring effect and improving the overall quality of stereoscopic *** photo-cured PQDs film,which undergoes free radical photopolymerization,displays an impressive photoluminescence quantum yield(PL QY)of up to 89.2%,reaching 98%of the value observed in the solution *** approach outlined in this research is both cost-effective and pragmatic,exhibiting tremendous promise for diverse system-level integrated optoelectronic devices,such as ultra-high-resolution micro-light-emitting device(micro-LED)displays.

关键词： perovskite quantum dots microarrays cross-linking strategy Inkjet printing photolithography

Seasonal Characteristics of Forecasting Uncertainties in Surface PM_(2.5)Concentration Associated with Forecast Lead Time over the Beijing-Tianjin-Hebei Region

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Advances in Atmospheric Sciences 2024年第5期41卷 801-816页

作者： Qiuyan DU Chun ZHAO Jiawang FENG Zining YANG jiamin xu Jun GU Mingshuai ZHANG Mingyue xu Shengfu LIN Deep Space Exploration Laboratory/School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Comparative Planetology University of Science and Technology of ChinaHefei 230026China

Forecasting uncertainties among meteorological fields have long been recognized as the main limitation on the accuracy and predictability of air quality ***,the particular impact of meteorological forecasting uncertainties on air quality forecasts specific to different seasons is still not well *** this study,a series of forecasts with different forecast lead times for January,April,July,and October of 2018 are conducted over the Beijing-Tianjin-Hebei(BTH)region and the impacts of meteorological forecasting uncertainties on surface PM_(2.5)concentration forecasts with each lead time are *** increased lead time,the forecasted PM_(2.5)concentrations significantly change and demonstrate obvious seasonal *** general,the forecasting uncertainties in monthly mean surface PM_(2.5)concentrations in the BTH region due to lead time are the largest(80%)in spring,followed by autumn(~50%),summer(~40%),and winter(20%).In winter,the forecasting uncertainties in total surface PM_(2.5)mass due to lead time are mainly due to the uncertainties in PBL heights and hence the PBL mixing of anthropogenic primary *** spring,the forecasting uncertainties are mainly from the impacts of lead time on lower-tropospheric northwesterly winds,thereby further enhancing the condensation production of anthropogenic secondary particles by the long-range transport of natural *** summer,the forecasting uncertainties result mainly from the decrease in dry and wet deposition rates,which are associated with the reduction of near-surface wind speed and precipitation *** autumn,the forecasting uncertainties arise mainly from the change in the transport of remote natural dust and anthropogenic particles,which is associated with changes in the large-scale circulation.

关键词： PM_(2.5) forecasting uncertainties forecast lead time meteorological fields Beijing-Tianjin-Hebei region

Complement Factor H Displays Opposite Expression Patterns Under Two Situations of Methamphetamine Administration:Acute Exposure and Chronic Dependence

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Neuroscience Bulletin 2020年第12期36卷 1558-1562页

作者： Ming Lin jiamin xu Zhimin Liu Liang Qin Xiaodong Wang Xiaoping Pu National Key Research Laboratory of Natural and Biomimetic Drugs Peking UniversityBeijing 100191China Department of Molecular and Cellular Pharmacology School of Pharmaceutical SciencesPeking UniversityBeijing 100191China National Institute on Drug Dependence Peking UniversityBeijing 100191China Centre for Imaging and Systems Biology Minzu University of ChinaBeijing 100081China College of Life and Environmental Sciences Minzu University of ChinaBeijing 100081China

Dear Editor,Methamphetamine(METH)is a highly addictive central nervous system stimulant that has severe physical and psychological side-effects,including loss of appetite,hyperactivity,dysphoria,and depression[1].Due to its illegal production,distribution,sale,and possession it has become a worldwide *** is directly toxic to dopaminergic and serotoninergic neurons,resulting in excitotoxicity,oxidative stress,and other processes[2].Research on biomolecules associated with these processes will be useful for identifying potential markers,exploring the mechanism of METH dependence,and even developing prevention and treatment strategies.

关键词： prevention identifying burden

Self-assembled hydrolyzed gelatin nanoparticles from silver carp spine bones for Pickering emulsion stabilization

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Food Bioscience 2022年第4期48卷 87-97页

作者： Wenjuan Wu jiamin xu Lili Yang Mengyang Yang Ting Zhang Xichang Wang Jian Zhong National R&D Branch Center for Freshwater Aquatic Products Processing Technology(Shanghai) Integrated Scientific Research Base on Comprehensive Utilization Technology for By-Products of Aquatic Product ProcessingMinistry of Agriculture and Rural Affairs of the People’s Republic of ChinaShanghai Engineering Research Center of Aquatic-Product Processing and PreservationCollege of Food Science&TechnologyShanghai Ocean UniversityShanghai201306China Xinhua Hospital Shanghai Institute of Pediatric ResearchShanghai Key Laboratory of Pediatric Gastroenterology and NutritionSchool of MedicineShanghai Jiao Tong UniversityShanghai200092China

In this work,enzymatic hydrolysis modification was combined with silver carp spine bone gelatin extraction process to obtain pepsin enzyme hydrolyzed gelatins(PEHGs)for emulsion *** pepsins at ratios of 6-24 U/g of silver carp vertebrae,PEHGs were obtained with molecular weights of mainly<5 KDa and the production yields were 12.6%-13.3%.The obtained PEHGs at different pepsin/vertebrae ratios showed similar secondary structure *** could self-assembled into pH-stable *** had higher fat-binding capacity values(16.2-21.5 g of oil/g of PEHG)and higher emulsion stabilization ability(creaming index values<11%after 28-day storage at 4℃)than silver carp scale gelatins,bovine bone gelatin,cold-water CFG and tilapia skin *** the decrease of pepsin/vertebrae ratios in the PEHG preparation process,the nanoparticle numbers and sizes increased,the turbidities of PEHG solutions increased,the gel strengths(164-314 g)of PEHG gels increased,the initial droplet sizes of Pickering emulsions decreased,and creaming stability of Pickering emulsions *** work provided useful information to analyze the effect of enzymatic hydrolysis modification on the structural,functional,and emulsifying properties of a *** also provided an efficient way to prepare protein self-assembly nanoparticles from animal tissues.

关键词： Extraction Enzymatic hydrolysis Fish oil-loaded Pickering emulsion Gelatin nanoparticles Silver carp spine bone

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浅谈隧道工程的动态设计与信息化施工

现代隧道技术 2013年第5期50卷 1-5页

作者：徐加民北京市市政工程设计研究总院北京100082

隧道工程是处在各种地质环境中的地下结构物,地质环境的不可预知性决定了隧道工程的高风险性和复杂性。由于现行隧道设计理论尚不成熟,多采用工程类比和经验设计,同时强调动态设计与信息化施工;而现实中设计和施工又分属于两个不同的单... 详细信息

隧道工程是处在各种地质环境中的地下结构物,地质环境的不可预知性决定了隧道工程的高风险性和复杂性。由于现行隧道设计理论尚不成熟,多采用工程类比和经验设计,同时强调动态设计与信息化施工;而现实中设计和施工又分属于两个不同的单位,往往不能做到很好的结合,因此酿成事故或造成浪费时有发生。文章针对这一问题进行了分析,并指出应从管理机制上促进设计和施工一体化,建立动态设计和信息化施工体系,以形成对项目的投资效率和效益的整体、综合的评价机制。

关键词：隧道工程动态设计信息化施工管理机制

Preparation of Carboxymethyl Sulfochitosans with Differentially Substituted Regions

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Journal of Ocean University of Qingdao 2003年第1期2卷 69-74页

作者： ZHAO Xia LV Zhihua xu jiamin YU Guangli Insititute of Marine Drug and Food Ocean University of ChinaQingdao 266003P..R.China

Five kinds of carboxymethyl sulfochitosans with different regions such as N-carboxymethyl-O-sulfochitosan, O-carboxymethyl-N-sulfochitosan, O-carboxymethyl chitosan sulfate, N-carboxymethyl chitosan-6-sulfate, and N,O-carboxymethyl -N,O-sulfochitosan were prepared respectively by using differential carboxymethylation and sulfation methods, and their IR spectrum and 13C-NMR spectrum were measured.

关键词： chitosan carboxymethyl chitosan chitosan sulfate preparation

模拟冷链温度波动对CdTe量子点荧光淬灭性能的影响

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农业工程学报 2017年第18期33卷 291-297页

作者：杨加敏胥义钮怡清上海理工大学医疗器械与食品学院上海200093

为了探索CdTe量子点在冷链储运过程中的荧光淬灭性能,分别研究了贮藏温度(25、4、-5和-20℃)、温度波动幅度(4℃波动至25℃和40℃)以及波动频率(每30min和60min波动)等因素对其的影响程度。研究结果表明,贮藏温度及时间对量子点荧光淬... 详细信息

为了探索CdTe量子点在冷链储运过程中的荧光淬灭性能,分别研究了贮藏温度(25、4、-5和-20℃)、温度波动幅度(4℃波动至25℃和40℃)以及波动频率(每30min和60min波动)等因素对其的影响程度。研究结果表明,贮藏温度及时间对量子点荧光淬灭有显著影响(P<0.05),贮藏温度越高,量子点荧光淬灭速度越快;冷链环境模拟试验发现冷链温度波动幅度越大、波动频率越高,量子点荧光淬灭速度越快,这与食品品质变化特点极其相似;且贮藏温度、温度波动幅度和频率对量子点HSV值有显著影响。研究结论表明,CdTe量子点在食品冷链储运监控方面具有一定的应用潜力。

关键词：温度荧光淬灭冷链模拟 CdTe量子点