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An implantable wireless powered light source

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Optoelectronics Letters 2020年第2期16卷 81-86页

作者： LI ya-min PEI Wei-hua TANG jun WANG Yu-guang yaO Zhao-lin LIU Zhi-duo CHEN Hong-da State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China University of Chinese Academy of Sciences Beijing 100049China CAS Center for Excellence in Brain Science and Intelligence Technology Shanghai 200000China Peking University Hospital of Stomatology Beijing 100083China

A wireless powered small volume light source composed of light emitting diode(LED) array is developed for implantation. According to the volt-ampere characteristics of LED and the load characteristics of coil coupling power supply, the light power and work distance of implant LED-array are optimized by changing the number and series-parallel connection mode of LEDs in receiver. The wireless powered implant can provide 5.4 m W light. The entire implant is seamlessly packaged within parylene, a biocompatible material, coating by chemical vapor depositing. The volume of the implant is 9 mm×4 mm×3 mm, the weight of which is only 0.25 g. The device can work continuously for more than three weeks in 0.9% saline and the prime prototype of the device has been validated by animal implantation.

关键词： wireless light source

GNSS techniques for real-time monitoring of landslides:a review

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Satellite Navigation 2023年第1期4卷 214-223,I0006页

作者： Guanwen Huang Shi Du duo Wang College of Geology Engineering and Geomatics Chang’an UniversityXi’an 710054ShannxiChina Key Laboratory of Ecological Geology and Disaster Prevention Ministry of Natural ResourcesXi’an 710054ShannxiChina

Currently,Global Navigation Satellite System(GNSS)Real-Time Kinematic positioning(RTK)and Precise Point Positioning(PPP)techniques are widely employed for real-time monitoring of ***,both RTK and PPP monitoring techniques have their limitations,such as limited service coverage or long convergence ***-RTK technique which integrates RTK and PPP is a novel approach for monitoring landslides with the advantages of rapid convergence,high-precision,and a wide service *** study summarizes the limitations of RTK,PPP,and PPP-RTK monitoring techniques and suggests some improved *** performances are compared and analyzed using real monitoring *** experiment results demonstrate that RTK is the best option for small-scale(the baseline distance<15 km)and real-time landslide monitoring without considering the *** technique converges to centimeter-level accuracy in tens of minutes,only suitable for the stability analysis of reference *** a large area(the baseline distance<100 km),PPP-RTK can provide excellent horizontal accuracy and adapt the service range in response to the demand for monitoring accuracy,as the vertical accuracy is signifcantly impacted by the service range and elevation ***,the characteristics of three techniques are integrated to form a comprehensive landslide monitoring technique that considers intelligence,robustness,and real-time.

关键词： Landslide geohazards RTK PPP PPP-RTK Monitoring

Conditional Quadratic Semidefinite Programming:Examples and Methods

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Journal of the Operations Research Society of China 2014年第2期2卷 143-170页

作者： Hou-duo Qi School of Mathematics The University of SouthamptonHighfieldSouthampton SO171BJUK

The conditional quadratic semidefinite programming(cQSDP)refers to a class of matrix optimization problems whose matrix variables are required to be positive semidefinite on a subspace,and the objectives are *** chief purpose of this paper is to focus on two primal examples of cQSDP:the problem of matrix completion/approximation on a subspace and the Euclidean distance matrix *** the latter problem,we review some classical contributions and establish certain links among ***,we develop a semismooth Newton method for a special class of cQSDP and establish its quadratic convergence under the condition of constraint *** also include an application in calibrating the correlation matrix in Libor market *** hope this work will stimulate new research in cQSDP.

关键词： Matrix optimization Conditional semidefinite programming Euclidean distance matrix Semismooth Newton method

Fatigue resistance of ProTaper gold exposed to high-concentration sodium hypochlorite in double curvature artificial canal

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Bioactive Materials 2019年第1期4卷 245-248页

作者： Fahda Algahtani Xiangya Huang Markus Haapasalo Zhejun Wang Ahmed Hieawy duo Zhang Jolanta Aleksejuniene ya Shen Department of Oral Biological and Medical Sciences Faculty of DentistryThe University of British ColumbiaVancouverCanada College of Dentistry Princess Nourah Bint Abdulrahman UniversitySaudi Arabia Department of Conservative Dentistry and Endodontics Guanghua School of StomatologySun Yat-Sen UniversityGuangzhouChina

This study aimed to evaluate and compare the fatigue resistance of ProTaper Gold(PTG)and ProTaper Universal(PTU)in artificial single and double curvature canals in 5%sodium hypochlorite(NaOCl)at body temperature(37℃).PTG and PTU files(size F1)were subjected to fatigue tests in two different artificial ceramic *** single curvature model had a 60°curvature angle with a 5mm *** double curvature model had a 60°curvature angle with a 5mm radius and a second 30°curvature with a 2mm radius.A file segment was introduced into the artificial canal and immersed in water or 5%NaOCl at 37℃.The total number of cycles to fracture(NCF)was *** were analyzed using t-test and linear regression *** NCF of all files was significantly influenced by the type of NiTi metal alloy(P<.01),canal curvatures(P<.01),and the environmental conditions(P<.05).PTG had higher fatigue resistance than PTU files in both single and double curvature canals(P<.05).The NCF of PTU files in 5%NaOCl was shorter than that in water(P<.05).The mean length of broken PTG was significantly shorter than those of PTU files in both single and double curvature canals(P<.01).The fatigue performance of PTG is better than that of PTU in both single and double *** conditions may affect the fatigue behavior of PTU files with single curvature.

关键词： Body temperature Corrosion Double curvature Fatigue resistance ProTaper Gold

Projective Bundles and Blowing-Ups Ⅱ

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Algebra Colloquium 2024年第1期31卷 57-62页

作者： duo Li School of Mathematics(Zhuhai) Sun Yat-Sen University ZhuhaiGuangdong 519082China

We study the blowing-up X of a smooth projective variety X along a smooth center B that is equipped with a projective bundle structure over a variety *** the Picard number p(X)is 1 and dim X is at most 4,we classify a... 详细信息

关键词： blowing-up projective bundle Fano bundle

Hot deformation behavior and microstructure features of FeCrAl-ODS alloy

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Journal of Iron and Steel Research International 2022年第9期29卷 1455-1463页

作者： Di-jun Long Shao-yu Qiu Wen-bo Liu Yong-duo Sun Wei Luo Hui-qun Liu Rui-qian Zhang Nuclear Power Institute of China Chengdu 610213SichuanChina School of Materials Science and Engineering Central South UniversityChangsha 410083HunanChina

The hot deformation behavior of FeCrAl-ODS alloys at temperatures of 1050-1200℃ and strain rates of 0.001-1 s^(-1),*** peak stress of FeCrAl-ODS alloy during hot deformation decreased with increasing temperature and decreasing strain *** addition,the stress-strain curves show a dynamic softening phenomenon according to the shape of the flow *** on the Arrhenius-type model,a constitutive equation and processing map of FeCrAl-ODS alloy were ***,we proposed optimum processing parameters of 1200℃ and 0.001 s^(-1)based on the processing *** with FeCrAl alloys,there was no significant phenomenon of grain coarsening during hot deformation in FeCrAl-ODS *** the electron backscattered diffraction images,both recrystallized and recovered grains were observed in the matrix under dfferent deformation *** fraction of dynamically recrystallized grains in the matrix under the deformation of 1100 C/0.001 s^(-1)(42.5%)was significantly higher than that at 1200℃/0.001 s^(-1)(10.6%),which was consistent with the stress-strain curves.

关键词： FeCrAl-ODS steel Oxide dispersion strengthening High-temperature deformation Processing map

Isolated interrupted aortic arch in an adult:A case report

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World Journal of Clinical Cases 2021年第4期9卷 992-998页

作者： Shu-Wen Dong duo-duo Di Guan-Xun Cheng Medical Imaging Department Peking University Shenzhen HospitalShenzhen 518000Guangdong ProvinceChina Medical Imaging Department Anhui Medical UniversityHefei 230000Anhui ProvinceChina

BACKGROUND Interrupted aortic arch(IAA)is a rare congenital heart disease defined by an interruption of the lumen and anatomical continuity between the ascending and descending major *** is usually found within a few hours or days of *** surgery,the chances of survival are *** IAA patients have an effective collateral circulation established,they can survive into ***,IAA in adults is extremely rare,with few reported *** SUMMARY A 27-year-old woman presented with a 6-year history of progressively worsening shortness of breath and chest tightness on *** had cyanotic lips and clubbing of the fingers.A transthoracic echocardiogram revealed an enlarged heart and dilation of the main pulmonary *** was an abnormal 9 mm passage between the descending aorta and pulmonary *** ventricular septal outflow tract had a 14 mm *** ultrasound suggested a patent ductus arteriosus and computed tomographic angiography showed the absence of the aortic *** diagnoses were ventricular septal defect,patent ductus arteriosus,and definite interruption of the aortic *** surgical correction was recommended,the patient declined due to the surgical risks and was treated with medications to reduce pulmonary artery pressure and treat heart *** condition has been stable for 12 mo of *** Although rare,IAA should be considered in adults with refractory hypertension or unexplained congestive heart failure.

关键词： Interrupted aortic arch Diagnostic imaging Multimodal imaging Patent ductus arteriosus Ventricular septal defect Case report

SCRaMbLE drive application of synthetic yeast genome

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Frontiers of Chemical Science and Engineering 2018年第4期12卷 832-834页

作者： Jin Jin Yuan Ma duo Liu Key Laboratory of Systems Bioengineering (Ministry of Education) School of Chemical Engineering and TechnologyTianjin University Tianjin 300072China

The Synthetic Yeast Genome Project (Sc2.0) consortium has recently published a collection of seven reports on the development of Synthetic Chromosome Rearrangement and Modification by LoxP-Mediated Evolution (SCRaMbLE) system that set the stage for the application of synthetic yeast genome. Scientists of synthetic genomics have worked on de novo genome synthesis from viruses, bacteria to eukaryote [1–12]. What can we do with these synthetic genomes? The JCVI-syn3.0 contains 473 genes with 531 kbp which minimized from 1079 kbp synthetic genome of Mycoplasma mycoides JCVI-syn1.0. This minimal bacterial genome will be a new platform for investigating the core function of cell [3]. The ***-57 project aims to synthetize a 3.97 Mbp 57-codon Escherichia coli genome which could produce a virus-resistant, biocontained bacterium for industrial applications, though only individually recoded segments were tested [4]. In a collection of seven papers [13–19], members of Sc2.0 consortium answer the question with several new developed methods and strategies of synthetic yeast genome rearrangement, exhibiting the powerful applications of SCRaMbLE to accelerate phenotypic evolution.

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Improved Performance of Solid-State Gratzel Solar Cell by Cosensitization of Quantum Dot and Dye

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Chinese Physics Letters 2004年第7期21卷 1391-1393页

作者： LIBin WANGLi-duo LIJiang-Wei QIUYong DepartmentofChemistry TsinghuaUniversityBeijing100084 KeyLabofOrganicOptoelectronics&MolecularEngineeringofMinistryofEducation Beijing100084

We report a new cosensitization utilizing quantum dot (QD) PbS and Cis-(SCN)2Bis(2,2"-bipyridyl-4,4"-dicarboxylate) ruthenium (N3) dye on the nanoporous TiO2 film. Solid-state Gratzel solar cells with the cosensitized films show an improved overall efficiency by 200% relative to the cells assembled with only N3 sensitization and an extremely high open-circuit voltage of 840 mV, and a fill factor of 70.5%. Back reaction characteristics of the above cells are also investigated, demonstrating a great suppression of recombination due to cosensitization. It seems that the cosensitization also facilitates the electron injection into the conduction band of TiO2.

关键词： Solar cells