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Ultrahigh-sensitive optical coherence elastography

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Light(Science & Applications) 2020年第1期9卷 1470-1479页

作者： Yan Li Sucbei Moon jason Jchen Zhikai Zhu Zhongping chen Beckman Laser Institute University of CaliforniaIrvineIrvineCA 92612USA Department of Biomedical Engineering University of CaliforniaIrvineIrvineCA 92617USA Department of Physics Kookmin UniversitySeoul 02707South Korea

The phase stability of an optical coherence elastography(OCE)system is the key determining factor for achieving a precise elasticity measurement,and it can be affected by the signal-to-noise ratio(SNR),timing jitters in the signal acquisition process,and fluctuations in the optical path difference(OPD)between the sample and reference *** this study,we developed an OCE system based on swept-source optical coherence tomography(SS-OCT)with a common-path configuration(SS-OCECP).Our system has a phase stability of 4.2 mrad without external stabilization or extensive post-processing,such as *** phase stability allows us to detect a displacement as small as~300 pm.A common-path interferometer was incorporated by integrating a 3-mm wedged window into the SS-OCT system to provide intrinsic compensation for polarization and dispersion mismatch,as well as to minimize phase fluctuations caused by the OPD *** wedged window generates two reference signals that produce two OCT images,allowing for averaging to improve the ***,the electrical components are optimized to minimize the timing jitters and prevent edge collisions by adjusting the delays between the trigger,k-clock,and signal,utilizing a high-speed waveform digitizer,and incorporating a high-bandwidth balanced *** validated the SSOCECP performance in a tissue-mimicking phantom and an in vivo rabbit model,and the results demonstrated a significantly improved phase stability compared to that of the conventional *** the best of our knowledge,we demonstrated the first SS-OCECP system,which possesses high-phase stability and can be utilized to significantly improve the sensitivity of elastography.

关键词： optical interferometer polarization

Naval derusting wastewater containing high concentration of iron, treated in UV photo-Fenton-like oxidation

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Journal of Environmental Sciences 2010年第7期22卷 991-997页

作者： Daeik Kim jason Kou-Chaw chen Teh Fu Yen Sonny Astani Department of Civil and Environmental Engineering Viterbi School of Engineering University of Southern California BooKang Tech. Inc. Korea Building

The UV photooxidation with Fe（Ⅲ） and H2O2 was employed to treat a naval derusting wastewater, which contains the high COD （chemical oxygen demand） and various metal concentrations exceptionally with high concentrations of citric acid and iron. Because of its iron containment, the Fenton-like reaction automatically took place with the added amount of H2O2. The decomposition rate was found in a sequence of： UV/HEOE/Fe（Ⅲ）〉 UV/H2O2 〉 Fe（Ⅱ）/H2O2. Two H2O2 injection methods, single and multiple points, were evaluated. The multiple-point H2O2 injection was more efficient to decompose the citric acid. The decomposition of the synthetic citric acid and the real derusting citric acid wastewater was also compared. The 93% COD reduction of the derusting wastewater was achieved using the UV/HEOE/Fe（Ⅲ） treatment.

关键词： naval derusting wastewater citric acid UV photooxidation Fenton-like

Neuroendocrine differentiation of prostate cancer

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Asian Journal of Andrology 2013年第3期15卷 328-332页

作者： Zhen Li Clark J chen jason K Wang Elaine Hsia Wei Li Jill Squires Yin Sun Jiaoti Huang Departments of Pathology and Urology Jonsson Comprehensive Cancer Center and Broad Center for Regenerative Medicine and Stem Cell Research David Geffen School of Medicine at UCLA Los Angeles CA 90095-1732. USA

Benign prostate and prostatic adeno- carcinoma contain rare quiescentneuroendocrine cells while small cell neu- roendocrine carcinoma （SCNC）, a variant form of prostate cancer, contains highly proliferative neuroendocrine tumor cells. We provide evidence that IL-8-CXCR2- P53 pathway keeps the NE cells in a quiescent state normally. P53 mutation inactivates this pathway, resulting in hyper-proliferation and aggressive beha- vior of the NE cells in SCNC. Therefore, we have identified potential cells of origin and a molecular target for prostatic SCNC that are different from those of adenocarci- noma, which explains SCNC＇s distinct bio- logy and the clinical observation that it does not respond to hormonal therapy.

关键词： SMALL-CELL CARCINOMA ANDROGEN-INDEPENDENT GROWTH MOLECULAR CHARACTERIZATION CXCR2 RECEPTOR MOUSE MODEL TRANSDIFFERENTIATION ADENOCARCINOMA INTERLEUKIN-8 PHENOTYPE LNCAP

基于TROPOMI NO_(2)、CO及HCHO重构数据的近地面O_(3)浓度估算研究

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遥感学报 2024年第9期28卷 2348-2361页

作者：陈小娟秦凯 Cohen jason 何秦中国矿业大学环境与测绘学院徐州221116

以TROPOMI大气成分产品为代表的卫星遥感数据在近地面臭氧(O_(3))浓度估算中表现出很好的潜力。由于云及反演算法局限性等原因,TROPOMI的大气成分产品存在一定的数据缺失,使得基于此的近地面O_(3)浓度估算数据覆盖度较低。为此,本文采... 详细信息

以TROPOMI大气成分产品为代表的卫星遥感数据在近地面臭氧(O_(3))浓度估算中表现出很好的潜力。由于云及反演算法局限性等原因,TROPOMI的大气成分产品存在一定的数据缺失,使得基于此的近地面O_(3)浓度估算数据覆盖度较低。为此,本文采用经验正交函数分解插值法(DINEOF)对TROPOMI NO_(2)、CO、HCHO原始数据产品进行缺失像元重构,并基于重构数据产品采用极限梯度提升算法(XGBoost)估算了中国大陆地区2019年—2021年高覆盖度的日最大8 h平均O_(3)浓度(MDA8 O_(3))。对比研究了DINEOF方法对TROPOMI NO_(2)、CO、HCHO原始数据产品的缺失像元进行重构后再建模估算O_(3)的方法(方案1),使用TROPOMI NO_(2)、CO、HCHO原始数据产品并对其缺失像元赋空值并输入其他特征变量来建模估算O_(3)的方法(方案2),有TROPOMI NO_(2)、CO、HCHO原始数据产品的建模结果和无TROPOMI NO_(2)、CO、HCHO原始数据产品,只有其他特征变量的建模结果相结合的方法(方案3),均可提升O_(3)模型估算结果的覆盖度。实验表明:方案1的结果最好,其十折交叉验证R^(2)=0.86,RMSE=15.86μg/m^(3),模型精度和方案2基本一致且高于方案3,在重构区域的模型精度最高(训练集R^(2)=0.82,RMSE=15.57μg/m^(3)),且当重构区域出现O_(3)重污染时(浓度大于160μg/m^(3)),能明显改善模型高值低估现象,结果的空间分布更合理。方案1估算的2019年—2021年近地面MDA8 O_(3)的平均覆盖度从33.6%提升到97.2%,使用TROPOMI NO_(2)、CO、HCHO重构数据产品建模估算O_(3)可提升模型性能和模型结果的覆盖度。

关键词：遥感近地面O_(3) TROPOMI DINEOF XGBoost 数据重构

Developmental and Condition-Related Changes in the Prefrontal Cortex Activity during Rest

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Journal of Behavioral and Brain Science 2016年第12期6卷 485-497页

作者： Ling-Yin Liang Jia-Jin jason chen Patricia A. Shewokis Nancy Getchell Department of Physical Therapy University of Evansville Evansville IN USA Institute of Biomedical Engineering National Cheng Kung University Taiwan Department of Nutrition Sciences College of Nursing & Health Professions & School of Biomedical Engineering Drexel University Philadelphia PA USA Department of Kinesiology & Applied Physiology Biomechanics and Movement Science Program University of Delaware Newark DE USA

The prefrontal cortex (PFC) plays an important role in cognitive process related to executive function, but is also active during resting states. Quantifying prefrontal cortex activity during resting states provides a baseline for interpreting task-induced brain activity. Researchers commonly use resting conditions where participants are prompted to stare at a screen (eyes open) or close their eyes (eyes closed). Are these two conditions equivalent representations of a baseline resting state? Further, does prefrontal cortex activity during these conditions change as a function of development? The aim of this study was to examine differences in prefrontal cortex activity between eyes open and eyes closed conditions during resting states in children and adults to provide a rationale of proper selection of baseline condition in future research. Thirty-six participants in 3 age groups were recruited in this study including twenty-four adults, five 12 - 15 years old children, and seven 8 - 11 years old children. Relative changes in concentrations of oxygenated hemoglobin (Δoxy-Hb) and deoxygenated hemoglobin (Δdeoxy-Hb) were obtained by using functional Near-Infrared Spectroscopy (fNIRS) in eyes closed (EC) and eyes open (EO) conditions, 3 minutes each. Contrasts were tested to compare the differences of Δoxy-Hb and Δdeoxy-Hb between eyes open and eyes closed conditions. The EC condition had significantly higher Δoxy-Hb than EO when all groups were combined (t (17.268) = 3.021, p = .008, Cohen’s d = –0.72). When comparing Δoxy-Hb between eyes conditions within each group, the younger group had significantly higher Δoxy-Hb in EC than EO (t (9.459) = 2.734, p = 0.022, Cohen’s d = –1.46). Based on these results, the EO condition may be a better baseline condition, particularly in studies with younger children, since it has less activity in the PFC that could interfere with interpretations of task-induced activity.

关键词： Functional Near-Infrared Spectroscopy (fNIRS) Developmental Changes Resting Conditions Eyes Open (EO) Eyes Closed (EC)

Study on the Degradation and Synergistic /antagonistic Antioxidizing Mechanism of Phenolic /aminic Antioxidants and Their Combinations

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润滑油 2014年第3期29卷 45-55页

作者： Vincent J.Gatto Alfonso Ortiz Charles Zha jason chen Jeffrey Wang Albemarle Corporation Baton Rouge Albemarle Corporation(Shanghai)

Oxidation stability of lubricating oil is critical for the smooth operation of industrial equipment such as *** formation is a major issue in turbine ***,the turbine oil industry employs antioxidants,especially,the combination of aminic and phenolic antioxidants,as the key additives to reduce sludge *** amines,primarily PANA,are considered as the most effective antioxidants in terms of oxidation induction time(OIT)measured by the RPVOT ***,PANA is also a sludge *** antioxidants are normally used in combination with the aminic *** is widely believed that there exists a synergistic effect between the phenolic and aminic *** the interaction mechanism between the two types of antioxidants,it is generally accepted that phenolics act as a hydrogen donor to help regenerate the consumed aminic *** mechanism can only explain some of the phenomena observed in field practice,but there are many other questions remaining unanswered including the antagonistic effect between PANA and *** this study,we used HPLC,FTIR and LC-MS to monitor the degradation products of the oil systems that were formulated with various aminic and phenolic *** the APANA alone system,we identified the formation of dimers and trimers of *** the PANA alone system,we identified the formation of dimers and *** dimers,trimers,and tetramers of PANA have very limited *** findings therefore help explain why PANA is a sludge *** oligomerizations(dimerization,trimerization,etc.)regenerate the N-H functionality,thus explaining why the PANA as well as other amines are very effective *** the PANA/phenolic system,the oligomers of PANA were greatly ***,we identified species that were formed by the recombination of the PANA radicals,or the PANA oligomeric radicals with the phenolic ***,to our knowledge,has not been reporte

关键词：石油产品副产品石油原油

Construction of a novel six-gene signature to predict tumour response to induction chemotherapy and overall survival in locoregionally advanced laryngeal and hypopharyngeal carcinoma

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Genes & Diseases 2024年第3期11卷 148-150页

作者： chen Tan Lingwa Wang Yifan Yang Shizhi He George G.chen jason YK.Chan Michael CF.Tong C.A.van Hasselt Wenbin Xu Ling Feng Ru Wang Jugao Fang Department of Otolaryngology Head and Neck Surgery Beijing Tongren HospitalCapital Medical UniversityBeijing 100730China Key Laboratory of Otolaryngology Head and Neck Surgery(Ministry of Education of China) Beijing Institute of OtolaryngologyBeijing 100730China Department of Otorhinolaryngology Head and Neck SurgeryThe Chinese University of Hong KongPrince of Wales HospitalHongKong SAR999077China Department of Medical Genetics Institute of Basic Medical ScienceChinese Academy of Medical Science&Peking Union Medical CollageBeijing 100730China

Locoregionally advanced laryngeal and hypopharyngeal cancers(LA-LHCs)are traditionally treated with surgery followed by postoperative radiotherapy,which impairs speech and swallowing functions and reduces the quality of life.^(1,2)The use of induction chemotherapy(IC)as a larynxpreserving approach for LA-LHCs has been verified and refined.^(3)However,the short-term tumor response to IC varies,non-responders usually show poor survival and little benefit.

关键词： chemotherapy laryngeal surgery

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工长口头沟通影响工人的不安全行为研究

工长口头沟通影响工人的不安全行为研究

作者：陈昌涛（jason chen）清华大学

学位级别：硕士

由于中国是一个正在转型中以及人口密度高的国家，在可持续发展的方针下，建设发展成为了不可或缺的元素。中国的建筑行业已经开始于世界其他国的相同领域接轨，在施工安全政策和方针都以借鉴的方式学习并完善国内对施工安全的管理机制... 详细信息

由于中国是一个正在转型中以及人口密度高的国家，在可持续发展的方针下，建设发展成为了不可或缺的元素。中国的建筑行业已经开始于世界其他国的相同领域接轨，在施工安全政策和方针都以借鉴的方式学习并完善国内对施工安全的管理机制。但在中国建筑行业工人的安全绩效似乎还是落后于其他国家。由于大量的建筑工人来自中国的农村地区，这一群人的共同特点通常是文化水平较低和职业技能较低，导致在作业时不能完全遵循工地的安全规范。因工人无法在作业时合理的判断所在的施工环境，可能导致作业时误判危险环境形成工人最终选择危险性行为。这一问题对于实现“零事故”将是一个很大地挑战。同时，管理者的沟通风格和模式也能影响工人对施工安全的认识和对不安全环境的判断。本文将以认知科学的角度对管理者的口头沟通风格、模式以及工人对施工安全的认知和行为作为主要研究方向，并试图找出在中国建筑市场现有的普遍现象和对应的解决方法。通过以工长的沟通方式来进一步了解工人对安全的认知失效与他们不安全行为之间的影响，本研究采用了Input–Process–Output (IPO)模型来关联研究中不同的变量因子。利用经历抽样法(Experience Sampling Method)和实地取样的方法来收取相关的数据。本研究在两个不同的工地收取89名建筑工人关于工长与他们的沟通和工人的安全认知的数据，以及现场工人的不安全行为数据。结果表明，了解工人不安全行为的根本原因可能可以协助工长更有效地管理现场的工人。试验结果发现工长的口头沟通方式很有可能直接影响到工人对安全的认知，从而导致工人在现场施工安全行为。本文进行了一项实验，以中国的两个建筑工地作为试验案例，以钢筋建筑工人作为核心的试验对象。该实验设计是基于文献回顾和专家访谈而建立的。实验的主要重点包括：1）建立工长的口头沟通、工人的安全认知以及工人现场的不安全行为之间的关联机理模型，和2）利用案例研究的方式验证相关的关联点。本研究发现工长的口头沟通方式会影响到工人施工时的不安全行为。虽然两组的工长与他们的工人对安全的交流力度非常相似，但是两组工人最终的安全行为比例却有些不同。工人的安全意识很可能被他们的工长的沟通方式影响。在认知工程学的角度来看，工长采用合适的沟通方式将能更有效地提高工人对安全的认知以减少工人在现场的施工时的不安全行为。

关键词：工长口头沟通安全环境认知失效工人的观点不安全行为

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中东呼吸综合征

中华流行病学杂志 2013年第10期34卷 1043-1044页

作者：陈敬贤周妍吴东美国哥伦比亚大学医学院病理与细胞生物学系 NY10032

2012年9月埃及病毒学家Zaki报告从沙特阿拉伯（沙特）一名60岁急性肺炎并发急性肾功能衰竭的男性患者中分离出一株新型冠状病毒。

关键词：中东呼吸综合征冠状病毒流行病学