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Highly Concentrated,Conductive,Defect-free graphene Ink for Screen-Printed Sensor Application

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Nano-Micro Letters 2021年第6期13卷 17-30页

作者： Dong Seok Kim Jae-Min Jeong Hong Jun Park Yeong Kyun Kim Kyoung g.Lee Bong gill Choi Department of Chemical Engineering Kangwon National UniversitySamcheokGangwon-do 25913Republic of Korea Resources Utilization Research Center Korea Institute of Geoscience and Mineral ResourcesDaejeon 34132Republic of Korea Center for Nano Bio Development National Nanofab CenterDaejeon 34141Republic of Korea

Conductive inks based on graphene materials have received significant attention for the fabrication of a wide range of printed and flexible ***,the application of graphene fillers is limited by their restricted mass production and the low concentration of their *** this study,a highly concentrated and conductive ink based on defect-free graphene was developed by a scalable fluid dynamics process.A high shear exfoliation and mixing process enabled the production of graphene at a high concentration of 47.5 mg mL^(−1)for graphene *** screen-printed graphene conductor exhibits a high electrical conductivity of 1.49×10^(4)S m^(−1)and maintains high conductivity under mechanical bending,compressing,and fatigue *** on the as-prepared graphene ink,a printed electrochemical sodium ion(Na^(+))sensor that shows high potentiometric sensing performance was ***,by integrating a wireless electronic module,a prototype Na^(+)-sensing watch is demonstrated for the real-time monitoring of the sodium ion concentration in human sweat during the indoor exercise of a *** scalable and efficient procedure for the preparation of graphene ink presented in this work is very promising for the low-cost,reproducible,and large-scale printing of flexible and wearable electronic devices.

关键词： graphene ink Fluid dynamics Screen printing Ion sensor Real-time monitoring

Widefield optical coherence tomography of foveal dragging in retinopathy of prematurity

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International Journal of Ophthalmology(English edition) 2019年第7期12卷 1219-1223页

作者： Victor M.Villegas Stephen g.Schwartz Audina M.Berrocal Timothy g.Murray Harry W. Flynn Jr. Bascom Palmer Eye Institute University of Miami Miller School of Medicine Miami Florida 33136 USA Murray Ocular Oncology and Retina Miami Florida 33143USA

Dear Editor,Despite substantial advances in neonatal medicine, retinopathy of prematurity (ROP) continues to be a serious therapeutic challenge⑴.Visual acuity loss in patients with ROP has been associated with structural retinal abnormalities (including retinal detachment, retinal folds, and pigmentary retinopathy), cataract, glaucoma, and amblyopia due to refractive error or strabismus[2].

关键词： retinopathy of prematurity(ROP) foveal dragging structural retinal abnormalities

Real-time 850 nm multimode VCSEL to 1 550 nm single mode VCSEL data routing for optical interconnects

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Optoelectronics Letters 2019年第4期15卷 297-301页

作者： g.M.Isoe A.W.R.Leitch T.B.gibbon Centre for Broadband Communication Nelson Mandela University

Short-reach optical interconnects among massive serves in data centers have attracted extensive research recently. Increasing capacity, cost and power efficiency as well as wavelength switching between data center network nodes are still key challenges for current optical interconnects. In this work, we experimentally demonstrate the real-time intermode optical wavelength switching technique, for high-speed wavelength flexible data center interconnects. A10 gbit/s 1 550 nm single mode vertical cavity surface emitting laser(VCSEL) is optically injected and used to control a 10 gbit/s multimode VCSEL carrier at 850 nm. Results show that a clearly open eye diagram is achieved at back-to-back analysis, implying a successful wavelength switch and error-free operation at 10 gbit/s. A fully optical wavelength conversion of a multimode VCSEL operation at 850 nm using a single mode VCSEL subject to external optical injection at 1 550 nm is reported. This work opens new perspectives towards the development of a cost effective high-speed real-time inter-band wavelength switching technique between servers and network devices operating at different transmission windows at network nodes, for current and future optical interconnects.

关键词： VCSEL optical interconnects data centers

Cardiac diagnostics before oral propranolol therapy in infantile hemangioma: retrospective evaluation of 234 infants

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World Journal of Pediatrics 2018年第3期14卷 254-258页

作者： giovanni Frongia Ji-Oun Byeon Raoul Arnold Arianeb Mehrabi Patrick günther Division of Pediatric Surgery Department of GeneralVisceral and Transplantation SurgeryUniversity Hospital of HeidelbergIm Neuenheimer Feld 11069120 HeidelbergGermany Department of Pediatric Cardiology Center for Pediatrics and Adolescent MedicineUniversity Hospital of HeidelbergHeidelbergGermany Department of general Visceral and Transplantation SurgeryUniversity Hospital of HeidelbergHeidelbergGermany

Background The indication and extent of cardiac screening before oral propranolol therapy (OPT) in patients with infantile hemangioma (IH) has been challenged. In this study, we evaluated pre-OPT cardiac diagnostics in a pediatric IH cohort in our department. Methods Retrospective chart review of infants ≤ 12 months old with IH undergoing OPT. The diagnostics prior to OPT, occurrence of complications, and outcome were recorded. Results A total of 234 patients were evaluated. The mean age at the onset of OPT was 4.2 ± 0.3 months, the average dura-tion of OPT was 6.1 ± 0.1 months, and the average follow-up was 12.3 ± 0.7 months. Echocardiograms and electrocardio-grams were performed prior to OPT in all patients. One hundred and three (44.0%) echocardiograms revealed pathological findings, 19 (8.1%) of which were minor (including atrial septal defects, pulmonary stenosis, and patent ductus arteriosus). Pathological findings were observed in 17 (7.3%) of electrocardiograms, only one (0.4%) of which was minor (suspected cardiac arrhythmia, subsequently excluded by long-term electrocardiogram analysis). These findings did not contraindicate OPT and no severe adverse events associated with OPT occurred during the follow-up period. Conclusions Routine cardiac screening by electrocardiogram and echocardiogram before OPT is debatable and not routinely indicated in children with IH. Further studies are necessary to draw definite conclusions on the reasonable indication and extent of this diagnostic approach.

关键词： Cardiac diagnostics Echocardiogram Electrocardiogram Hemangioma Propranolol

氯化氢共振多光子电离光谱:F^1△_2态的光谱微扰分析

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物理学报 2013年第16期62卷 107-114页

作者：龙精明王华胜 Kvaran gúst 冰岛大学自然科学研究所

通过共振多光子电离-飞行时间法,记录了氯化氢分子在84800—85700cm-1范围内,F1△2(v′=1)里德堡态以及V1Σ+(v′=13,14)离子对态的电离产物H+,35Cl+,H35Cl+及其同位素的光谱数据.由于受离子对态V1Σ+的作用,F1△2(v′=1)态呈现出明显... 详细信息

通过共振多光子电离-飞行时间法,记录了氯化氢分子在84800—85700cm-1范围内,F1△2(v′=1)里德堡态以及V1Σ+(v′=13,14)离子对态的电离产物H+,35Cl+,H35Cl+及其同位素的光谱数据.由于受离子对态V1Σ+的作用,F1△2(v′=1)态呈现出明显的近共振相互作用特性.为了分析F1△2与V1Σ+态之间存在的光谱微扰,基于光解离电离通道的分析,并针对F1△2(v′=1)态离子信号比的变化,将离子信号二能级作用模型优化到三能级的作用模型,计算得到了微扰强度值为0.6cm-1,预解离系数γ为0.025.此外,对于F1△2(v′=1)与V1Σ+(v′=13,14)态的三个振动能级的光谱峰位置,采用光谱解微扰法拟合,同样得到了类似的微扰强度和去微扰后的各光谱参数.研究表明,激发至F1△2(v′=1)态得到的H+,Cl+离子主要是该态通过与离子对态耦合作用而产生,而F1△2(v′=1)态光谱位置偏移不仅受离子对态而且还受其他里德堡态作用的影响.同时,非零γ值证实了F1△2态预解离的存在.

关键词：光解离电离里德堡态离子对态光谱微扰

载体对其负载的Cu-Co双金属催化剂上5-羟甲基糠醛氢解选择性生成2,5-二甲基呋喃的影响（英文）

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Chinese Journal of Catalysis 2017年第4期38卷 699-709页

作者： Sanjay Srivastava g.C.Jadeja Jigisha Parikh 萨达尔瓦拉巴伊国立技术研究所化工系

碳-氧键氢解是生物质呋喃基化合物制备交通燃料常见的模型反应,其中5-羟甲基糠醛(HMF)转化为汽油添加剂2,5-二甲基呋喃(DMF)尤为引人关注.本文采用CeO_2,ZrO_2和Al_2O_3负载的Cu-Co双金属催化剂用于HMF选择性氢解制DMF的反应中.采用X射... 详细信息

碳-氧键氢解是生物质呋喃基化合物制备交通燃料常见的模型反应,其中5-羟甲基糠醛(HMF)转化为汽油添加剂2,5-二甲基呋喃(DMF)尤为引人关注.本文采用CeO_2,ZrO_2和Al_2O_3负载的Cu-Co双金属催化剂用于HMF选择性氢解制DMF的反应中.采用X射线衍射、N_2吸附-脱附、投射电镜、H_2-程序升温还原、氨-程序升温脱附和元素分析表征了新鲜的和使用过催化剂的结构,并将其与催化活性相关联.Cu-Co/CeO_2催化剂通过在大的Cu颗粒上还原C=O键生成了最多的2,5双(羟甲基呋喃)(BHMF).但Cu-Co/Al_2O_3催化剂具有高度分散的Cu,Cu-Co复合氧化物和大量的弱酸位,因而生成DMF的选择性最高.Cu-Co/ZrO_2催化剂则由于存在强酸位,DMF选择性较低,生成了各种过度氢解产物,如2,5而甲基四氢呋喃和5,5-二(亚甲基)双(2-甲基呋喃).因此,考察了Cu-Co/Al_2O_3催化剂上的反应路径,以及温度、氢气压力和时间等操作条件的影响,使其具有较优的HMF转化率和DMF选择性.

关键词： 5-羟甲基糠醛加氢氢解铜-钴双金属生物燃料

Testing of Lightning Protective System of a Residential Structure： Comparison of Data Obtained in Rocket-triggered Lightning and Current Surge generator Experiments

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高电压技术 2008年第12期34卷 2575-2582页

作者： g. Maslowski V.A. Rakov S. Wyderka J. Bajorek B.A. DeCarlo J. Jerauld g.H. Schnetzer J. Schoene M.A. Uman K.J. Rambo D.M. Jordan W. Krata Rzeszow University of Technology Rzeszow 35-959 Poland University of Florida Gainesville 32611 USA

We present a comparison of data obtained during testing of lightning protective system of a residential structure in rocket-triggered lightning experiment at the International Center for Lightning Research and Testing(ICLRT)at Camp Blanding,Florida,and current surge generator experiment at Rzeszow University of Technology in *** different configurations of LPS were tested in Poland with the dc grounding resistances of the entire system 4.09 Ω(LPS 1a),1.65 Ω(LPS 1b),and 2.88 Ω(LPS 2).For LPS 1a with three ground rods the value of the peak current entering the electrical circuit neutral was about 56% of the injected current peak,and for LPS 1b with two additional ground rods and two 5 m long buried horizontal conductors it was about 16%.For LPS 2 with five ground rods interconnected by a buried loop conductor this ratio was 21%.The current waveshapes in the ground rods differed from the injected current waveshapes and the current waveshapes in other parts of the test system,especially,for poorer-grounding LPS *** surge-generator results are consistent with those of triggered-lightning experiments at Camp Blanding,Florida(DeCarlo et al.,2008 [2]).

关键词：居民区雷电保护系统试验电流冲击发生器

VCSEL polarization modulation for pulse-per-second clock signal transfer in optical frequency distribution systems

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Optoelectronics Letters 2018年第5期14卷 376-379页

作者： g.M.Isoe A.W.R.Leitch and T.B.gibbon Centre for Broadband Communication Nelson Mandela UniversityPort Elizabeth 6031South Africa

In this paper, a novel vertical cavity surface emitting laser(VCSEL) polarization modulation technique based on polarization switching due to thermal heating in a single transverse mode class 10 g VCSEL at 1 310 nm is demonstrated experimentally. The inherent orthogonal polarization switching of the VCSEL carrier with changing bias is exploited in the transmission of pulse-per-second(PPS) timing clock signal. Experimental results show that PPS pulse widths of 9.97 μs and 9.98 μs are measured for back-to-back analysis and over 3.21 km of g 652 urban fibre transmission, respectively. This work provides a novel alternative for adoption in optical frequency and time transfer applications.

关键词： VCSEL 极化调整光频率分发系统信号热切换试验性 PPS

Collective migrations in an epithelial-cancerous cell monolayer

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Acta Mechanica Sinica 2021年第5期37卷 773-784,I0001页

作者： Jian‑Qing Lv Peng‑Cheng Chen Liu‑Yuan guan Wojciech T.góźdź Xi‑Qiao Feng Bo Li Institute of Biomechanics and Medical Engineering Applied Mechanics LaboratoryDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084China Institute of Physical Chemistry Polish Academy of SciencesKasprzaka 44/5201‑224 WarsawPoland

Collective cell migration is extensively observed in embryo development and cancer *** these processes,the interactions between cells with distinct identities and fates are of importance for boundary formation and host defense against *** this paper,we explore the collective dynamics of a two-dimensional cell mixing monolayer consisting of non-tumorigenic mammary epithelial cells and breast cancer *** show that the epithelial-cancerous cell mixing system displays unique sorting *** epithelial cells aggregate to form scattered clusters,which perform random motion with simultaneous translation and rotation,strikingly distinct from the classical persistent random walk of individual migratory *** motility of cancer cells is markedly promoted by the epithelial clusters,exhibiting remarkable contact enhancement of locomotion.A discrete model based on the Johnson-Kendall-Roberts contact mechanics is proposed to identify the influence of intercellular interactions,active migration forces and cell-substrate friction forces on the collective cell *** findings could advance our understanding of many biological processes,such as cancer metastasis and tissue morphogenesis.

关键词： Collective cells Cell mixing Dynamics Cell-cell interaction