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液相色谱-质谱分析中的基质效应 被引量:213
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作者 向平 沈敏 卓先义 《分析测试学报》 CAS CSCD 北大核心 2009年第6期753-756,共4页
介绍了液相色谱-质谱(LC-MS)分析中基质效应的产生机制、来源、评定方法和消除措施。基质效应由共流出的分析物和基质的竞争以及影响接口的离子化效率所致,主要来源于生物样品中的内源性组分和样品处理后引入的杂质。不同批次的生物样品... 介绍了液相色谱-质谱(LC-MS)分析中基质效应的产生机制、来源、评定方法和消除措施。基质效应由共流出的分析物和基质的竞争以及影响接口的离子化效率所致,主要来源于生物样品中的内源性组分和样品处理后引入的杂质。不同批次的生物样品,其基质效应存在差异,可通过柱后注射法和提取后添加法2种方法评定基质效应。实例介绍了基质效应、提取回收率和整个方法过程效率的具体计算方法。基质效应可能影响LC-MS方法的灵敏度、准确度和精密度,通过样品前处理、氘代内标的使用、色谱分离、质谱分析等过程的优化可有效消除基质效应。 展开更多
关键词 液相色谱-质谱 基质效应 评定 消除
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地黄连作障碍因素及解除措施研究 被引量:78
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作者 刘红彦 王飞 +1 位作者 王永平 鲁传涛 《华北农学报》 CSCD 北大核心 2006年第4期131-132,共2页
盆栽试验结果表明,地黄根系的分泌物,地黄叶和块茎中均含有对地黄块茎生长抑制的物质,其中以根系分泌物的抑制作用最突出,其次是地黄叶,这些是造成地黄不能连作的主要因素,重茬土高温来菌处理和加入活性炭、抗坏血酸处理,可有效地解除... 盆栽试验结果表明,地黄根系的分泌物,地黄叶和块茎中均含有对地黄块茎生长抑制的物质,其中以根系分泌物的抑制作用最突出,其次是地黄叶,这些是造成地黄不能连作的主要因素,重茬土高温来菌处理和加入活性炭、抗坏血酸处理,可有效地解除地黄连作障碍,但在大田实用效果需要进一步研究。 展开更多
关键词 地黄 连作障碍 解除
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Machine learning in materials informatics:recent applications and prospects 被引量:69
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作者 Rampi Ramprasad Rohit Batra +2 位作者 Ghanshyam Pilania Arun Mannodi-Kanakkithodi Chiho Kim 《npj Computational Materials》 SCIE EI 2017年第1期1-13,共13页
Propelled partly by the Materials Genome Initiative,and partly by the algorithmic developments and the resounding successes of data-driven efforts in other domains,informatics strategies are beginning to take shape wi... Propelled partly by the Materials Genome Initiative,and partly by the algorithmic developments and the resounding successes of data-driven efforts in other domains,informatics strategies are beginning to take shape within materials science.These approaches lead to surrogate machine learning models that enable rapid predictions based purely on past data rather than by direct experimentation or by computations/simulations in which fundamental equations are explicitly solved.Data-centric informatics methods are becoming useful to determine material properties that are hard to measure or compute using traditional methods—due to the cost,time or effort involved—but for which reliable data either already exists or can be generated for at least a subset of the critical cases.Predictions are typically interpolative,involving fingerprinting a material numerically first,and then following a mapping(established via a learning algorithm)between the fingerprint and the property of interest.Fingerprints,also referred to as“descriptors”,may be of many types and scales,as dictated by the application domain and needs.Predictions may also be extrapolative—extending into new materials spaces—provided prediction uncertainties are properly taken into account.This article attempts to provide an overview of some of the recent successful data-driven“materials informatics”strategies undertaken in the last decade,with particular emphasis on the fingerprint or descriptor choices.The review also identifies some challenges the community is facing and those that should be overcome in the near future. 展开更多
关键词 overcome SUBSET PROPERLY
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Molecular principles of metastasis: a hallmark of cancer revisited 被引量:38
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作者 Jawad Fares Mohamad Y.Fares +2 位作者 Hussein H.Khachfe Hamza A.Salhab Youssef Fares 《Signal Transduction and Targeted Therapy》 SCIE CSCD 2020年第1期2197-2213,共17页
Metastasis is the hallmark of cancer that is responsible for the greatest number of cancer-related deaths.Yet,it remains poorly understood.The continuous evolution of cancer biology research and the emergence of new p... Metastasis is the hallmark of cancer that is responsible for the greatest number of cancer-related deaths.Yet,it remains poorly understood.The continuous evolution of cancer biology research and the emergence of new paradigms in the study of metastasis have revealed some of the molecular underpinnings of this dissemination process.The invading tumor cell,on its way to the target site,interacts with other proteins and cells.Recognition of these interactions improved the understanding of some of the biological principles of the metastatic cell that govern its mobility and plasticity.Communication with the tumor microenvironment allows invading cancer cells to overcome stromal challenges,settle,and colonize.These characteristics of cancer cells are driven by genetic and epigenetic modifications within the tumor cell itself and its microenvironment.Establishing the biological mechanisms of the metastatic process is crucial in finding open therapeutic windows for successful interventions.In this review,the authors explore the recent advancements in the field of metastasis and highlight the latest insights that contribute to shaping this hallmark of cancer. 展开更多
关键词 METASTASIS overcome visited
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Deep learning in holography and coherent imaging 被引量:26
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作者 Yair Rivenson Yichen Wu Aydogan Ozcan 《Light(Science & Applications)》 SCIE EI CAS CSCD 2019年第1期437-444,共8页
Recent advances in deep learning have given rise to a new paradigm of holographic image reconstruction and phase recovery techniques with real-time performance.Through data-driven approaches,these emerging techniques ... Recent advances in deep learning have given rise to a new paradigm of holographic image reconstruction and phase recovery techniques with real-time performance.Through data-driven approaches,these emerging techniques have overcome some of the challenges associated with existing holographic image reconstruction methods while also minimizing the hardware requirements of holography.These recent advances open up a myriad of new opportunities for the use of coherent imaging systems in biomedical and engineering research and related applications. 展开更多
关键词 COHERENT HOLOGRAPHIC overcome
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Advanced liquid crystal devices for augmented reality and virtual reality displays:principles and applications 被引量:17
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作者 Kun Yin En-Lin Hsiang +6 位作者 Junyu Zou Yannanqi Li Zhiyong Yang Qian Yang Po-Cheng Lai Chih-Lung Lin Shin-Tson Wu 《Light(Science & Applications)》 SCIE EI CAS CSCD 2022年第7期1344-1365,共22页
Liquid crystal displays(LCDs)and photonic devices play a pivotal role to augmented reality(AR)and virtual reality(VR).The recently emerging high-dynamic-range(HDR)mini-LED backlit LCDs significantly boost the image qu... Liquid crystal displays(LCDs)and photonic devices play a pivotal role to augmented reality(AR)and virtual reality(VR).The recently emerging high-dynamic-range(HDR)mini-LED backlit LCDs significantly boost the image quality and brightness and reduce the power consumption for VR displays.Such a light engine is particularly attractive for compensating the optical loss of pancake structure to achieve compact and lightweight VR headsets.On the other hand,high-resolution-density,and high-brightness liquid-crystal-on-siilicon(LCoS)is a promising image source for the see-through AR displays,especially under high ambient lighting conditions.Meanwhile,the high-speed LCoS spatial light modulators open a new door for holographic displays and focal surface displays.Finally,the ultrathin planar diffractive LC optical elements,such as geometric phase LC grating and lens,have found useful applications in AR and VR for enhancing resolution,widening fiield-of-view,suppressing chromatic aberrations,creating multiplanes to overcome the vergence-accommodation conflict,and dynamic pupil steering to achieve gaze-matched Maxwellian displays,just to name a few.The operation principles,potential applications,and future challenges of these advanced LC devices will be discussed. 展开更多
关键词 CRYSTAL PRINCIPLES overcome
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农村居民医疗保障“逆向”收入再分配效应形成机制及克服——以江苏省为例 被引量:18
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作者 詹长春 郑珊珊 《农业经济问题》 CSSCI 北大核心 2018年第10期85-93,共9页
医疗保障作为社会保障的重要组成部分,也具有一定调节收入再分配的能力。然而,由于目前农村居民医疗保障在制度设计上存在的某些缺陷,以及财政补助存在的某些偏差,致使农村居民医疗保障呈现出"逆向"的收入再分配效应。这种效应在农村... 医疗保障作为社会保障的重要组成部分,也具有一定调节收入再分配的能力。然而,由于目前农村居民医疗保障在制度设计上存在的某些缺陷,以及财政补助存在的某些偏差,致使农村居民医疗保障呈现出"逆向"的收入再分配效应。这种效应在农村居民医疗保障筹资阶段具有一定程度的表现,但表现并不十分明显,而在补偿环节却显得尤为突出。本文结合江苏省农村居民医疗保障"逆向"收入再分配效应的表现状况,分析这种效应的形成机制,并就如何克服这种效应提出相关政策建议。 展开更多
关键词 农村居民 医疗保障 “逆向”收入再分配效应 克服
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走出“技术性贸易壁垒”的认识误区 被引量:8
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作者 邓竞成 《财贸研究》 北大核心 2003年第6期18-21,共4页
客观全面地解读技术性贸易壁垒,走出某些认识的误区,切实提高各类产品的质量、技术和环保的标准,生产出达到甚至超过国外“技术标准”的产品,从根本上“跨越”国外的技术性贸易壁垒,才能拥有更大的国际贸易“领地”。
关键词 技术性贸易壁垒 国际贸易 技术标准 世界贸易组织 贸易保护
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Therapeutic targets and biomarkers of tumor immunotherapy:response versus non-response 被引量:16
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作者 Dong-Rui Wang Xian-Lin Wu Ying-Li Sun 《Signal Transduction and Targeted Therapy》 SCIE CSCD 2022年第10期3784-3810,共27页
Cancers are highly complex diseases that are characterized by not only the overgrowth of malignant cells but also an altered immune response.The inhibition and reprogramming of the immune system play critical roles in... Cancers are highly complex diseases that are characterized by not only the overgrowth of malignant cells but also an altered immune response.The inhibition and reprogramming of the immune system play critical roles in tumor initiation and progression.Immunotherapy aims to reactivate antitumor immune cells and overcome the immune escape mechanisms of tumors.Represented by immune checkpoint blockade and adoptive cell transfer,tumor immunotherapy has seen tremendous success in the clinic,with the capability to induce long-term regression of some tumors that are refractory to all other treatments.Among them,immune checkpoint blocking therapy,represented by PD-1/PD-L1 inhibitors(nivolumab)and CTLA-4 inhibitors(ipilimumab),has shown encouraging therapeutic effects in the treatment of various malignant tumors,such as non-small cell lung cancer(NSCLC)and melanoma.In addition,with the advent of CAR-T,CAR-M and other novel immunotherapy methods,immunotherapy has entered a new era.At present,evidence indicates that the combination of multiple immunotherapy methods may be one way to improve the therapeutic effect.However,the overall clinical response rate of tumor immunotherapy still needs improvement,which warrants the development of novel therapeutic designs as well as the discovery of biomarkers that can guide the prescription of these agents.Learning from the past success and failure of both clinical and basic research is critical for the rational design of studies in the future.In this article,we describe the efforts to manipulate the immune system against cancer and discuss different targets and cell types that can be exploited to promote the antitumor immune response. 展开更多
关键词 IMMUNOTHERAPY PRESCRIPTION overcome
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高校速度轮滑教学中学生畏惧心理的消除方法 被引量:17
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作者 刘雪凯 刘文礼 陈忠 《冰雪运动》 2006年第5期35-36,41,共3页
针对在速度轮滑教学中学生畏惧心理的表现,分析了畏惧心理产生的原因,认为应从加强学生的思想品德、组织纪律教育,培养良好的学习动机、意志品质和个性特征,教会学生自我保护,按人体机能变化规律进行教学等几个方面消除学生的畏惧心理。
关键词 速度轮滑 畏惧心理 消除
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Hybrid laser precision engineering of transparent hard materials:challenges,solutions and applications 被引量:16
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作者 Huagang Liu Wenxiong Lin Minghui Hong 《Light(Science & Applications)》 SCIE EI CAS CSCD 2021年第9期1607-1629,共23页
Laser has been demonstrated to be a mature and versatile tool that presents great flexibility and applicability for the precision engineering of a wide range of materials over other established micromachining techniqu... Laser has been demonstrated to be a mature and versatile tool that presents great flexibility and applicability for the precision engineering of a wide range of materials over other established micromachining techniques.Past decades have witnessed its rapid development and extensive applications ranging from scientific researches to industrial manufacturing.Transparent hard materials remain several major technical challenges for conventional laser processing techniques due to their high hardness,great brittleness,and low optical absorption.A variety of hybrid laser processing technologies,such as laser-induced plasma-assisted ablation,laser-induced backside wet etching,and etching assisted laser micromachining,have been developed to overcome these barriers by introducing additional medium assistance or combining different process steps.This article reviews the basic principles and characteristics of these hybrid technologies.How these technologies are used to precisely process transparent hard materials and their recent advancements are introduced.These hybrid technologies show remarkable benefits in terms of efficiency,accuracy,and quality for the fabrication of microstructures and functional devices on the surface of or inside the transparent hard substrates,thus enabling widespread applications in the fields of microelectronics,bio-medicine,photonics,and microfluidics.A summary and outlook of the hybrid laser technologies are also highlighted. 展开更多
关键词 TRANSPARENT VERSATILE overcome
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Deep-learning-powered photonic analogto-digital conversion 被引量:13
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作者 Shaofu Xu Xiuting Zou +3 位作者 Bowen Ma Jianping Chen Lei Yu Weiwen Zou 《Light(Science & Applications)》 SCIE EI CAS CSCD 2019年第1期611-621,共11页
Analog-to-digital converters(ADCs)must be high speed,broadband,and accurate for the development of modern information systems,such as radar,imaging,and communications systems;photonic technologies are regarded as prom... Analog-to-digital converters(ADCs)must be high speed,broadband,and accurate for the development of modern information systems,such as radar,imaging,and communications systems;photonic technologies are regarded as promising technologies for realizing these advanced requirements.Here,we present a deep-learning-powered photonic ADC architecture that simultaneously exploits the advantages of electronics and photonics and overcomes the bottlenecks of the two technologies,thereby overcoming the ADC tradeoff among speed,bandwidth,and accuracy.Via supervised training,the adopted deep neural networks learn the patterns of photonic system defects and recover the distorted data,thereby maintaining the high quality of the electronic quantized data succinctly and adaptively.The numerical and experimental results demonstrate that the proposed architecture outperforms state-ofthe-art ADCs with developable high throughput;hence,deep learning performs well in photonic ADC systems.We anticipate that the proposed architecture will inspire future high-performance photonic ADC design and provide opportunities for substantial performance enhancement for the next-generation information systems. 展开更多
关键词 thereby DEEP overcome
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Ultrathin monolithic 3D printed optical coherence tomography endoscopy for preclinical and clinical use 被引量:12
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作者 Jiawen Li Simon Thiele +8 位作者 Bryden C.Quirk Rodney W.Kirk Johan W.Verjans Emma Akers Christina A.Bursill Stephen J.Nicholls Alois M.Herkommer Harald Giessen Robert A.McLaughlin 《Light(Science & Applications)》 SCIE EI CAS CSCD 2020年第1期753-762,共10页
Preclinical and clinical diagnostics increasingly rely on techniques to visualize internal organs at high resolution via endoscopes.Miniaturized endoscopic probes are necessary for imaging small luminal or delicate or... Preclinical and clinical diagnostics increasingly rely on techniques to visualize internal organs at high resolution via endoscopes.Miniaturized endoscopic probes are necessary for imaging small luminal or delicate organs without causing trauma to tissue.However,current fabrication methods limit the imaging performance of highly miniaturized probes,restricting their widespread application.To overcome this limitation,we developed a novel ultrathin probe fabrication technique that utilizes 3D microprinting to reliably create side-facing freeform micro-optics(<130μm diameter)on single-mode fibers.Using this technique,we built a fully functional ultrathin aberration-corrected optical coherence tomography probe.This is the smallest freeform 3D imaging probe yet reported,with a diameter of 0.457 mm,including the catheter sheath.We demonstrated image quality and mechanical flexibility by imaging atherosclerotic human and mouse arteries.The ability to provide microstructural information with the smallest optical coherence tomography catheter opens a gateway for novel minimally invasive applications in disease. 展开更多
关键词 smallest utilize overcome
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Review of computer-generated hologram algorithms for color dynamic holographic three-dimensional display 被引量:11
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作者 Dapu Pi Juan Liu Yongtian Wang 《Light(Science & Applications)》 SCIE EI CAS CSCD 2022年第9期1962-1978,共17页
Holographic three-dimensional display is an important display technique because it can provide all depth information of a real or virtual scene without any special eyewear.In recent years,with the development of compu... Holographic three-dimensional display is an important display technique because it can provide all depth information of a real or virtual scene without any special eyewear.In recent years,with the development of computer and optoelectronic technology,computer-generated holograms have attracted extensive attention and developed as the most promising method to realize holographic display.However,some bottlenecks still restrict the development of computer-generated holograms,such as heavy computation burden,low image quality,and the complicated system of color holographic display.To overcome these problems,numerous algorithms have been investigated with the aim of color dynamic holographic three-dimensional display.In this review,we will explain the essence of various computer-generated hologram algorithms and provide some insights for future research. 展开更多
关键词 HOLOGRAPHIC DYNAMIC overcome
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众筹融资信息披露问题探析 被引量:12
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作者 雷华顺 《开放导报》 CSSCI 北大核心 2015年第2期49-52,共4页
众筹融资过程中存在的诸多信息失灵问题,造成交易双方在判断能力、谈判能力等方面不对等,不仅违反"意思自治、平等和诚信"等基本原则,更可能因逆向选择和道德风险引发"劣币驱逐良币"效应,导致众筹市场的消亡。市场... 众筹融资过程中存在的诸多信息失灵问题,造成交易双方在判断能力、谈判能力等方面不对等,不仅违反"意思自治、平等和诚信"等基本原则,更可能因逆向选择和道德风险引发"劣币驱逐良币"效应,导致众筹市场的消亡。市场自身无法解决信息失灵问题,需要制度克服,路径包括公权力的强制介入,对双方权利、义务和责任重新分配,实现双方地位的实质平等,或者通过冷静期、担保等制度设计达到上述目的。 展开更多
关键词 众筹 信息失灵 克服 制度设计
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Anti-scattering light focusing by fast wavefront shaping based on multi-pixel encoded digital-micromirror device 被引量:11
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作者 Jiamiao Yang Qiaozhi He +4 位作者 Linxian Liu Yuan Qu Rongjun Shao Bowen Song Yanyu Zhao 《Light(Science & Applications)》 SCIE EI CAS CSCD 2021年第8期1527-1535,共9页
Speed and enhancement are the two most important metrics for anti-scattering light focusing by wavefront shaping(WS),which requires a spatial light modulator with a large number of modulation modes and a fast speed of... Speed and enhancement are the two most important metrics for anti-scattering light focusing by wavefront shaping(WS),which requires a spatial light modulator with a large number of modulation modes and a fast speed of response.Among the commercial modulators,the digital-micromirror device(DMD)is the sole solution providing millions of modulation modes and a pattern rate higher than 20 kHz.Thus,it has the potential to accelerate the process of anti-scattering light focusing with a high enhancement.Nevertheless,modulating light in a binary mode by the DMD restricts both the speed and enhancement seriously.Here,we propose a multi-pixel encoded DMD-based WS method by combining multiple micromirrors into a single modulation unit to overcome the drawbacks of binary modulation.In addition,to efficiently optimize the wavefront,we adopted separable natural evolution strategies(SNES),which could carry out a global search against a noisy environment.Compared with the state-of-the-art DMD-based WS method,the proposed method increased the speed of optimization and enhancement of focus by a factor of 179 and 16,respectively.In our demonstration,we achieved 10 foci with homogeneous brightness at a high speed and formed W-and S-shape patterns against the scattering medium.The experimental results suggest that the proposed method will pave a new avenue for WS in the applications of biomedical imaging,photon therapy,optogenetics,dynamic holographic display,etc. 展开更多
关键词 mirror light overcome
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Targeting epigenetic regulators to overcome drug resistance in cancers 被引量:7
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作者 Nan Wang Ting Ma Bin Yu 《Signal Transduction and Targeted Therapy》 SCIE CSCD 2023年第3期1070-1093,共24页
Drug resistance is mainly responsible for cancer recurrence and poor prognosis.Epigenetic regulation is a heritable change in gene expressions independent of nucleotide sequence changes.As the common epigenetic regula... Drug resistance is mainly responsible for cancer recurrence and poor prognosis.Epigenetic regulation is a heritable change in gene expressions independent of nucleotide sequence changes.As the common epigenetic regulation mechanisms,DNA methylation,histone modification,and non-coding RNA regulation have been well studied.Increasing evidence has shown that aberrant epigenetic regulations contribute to tumor resistance.Therefore,targeting epigenetic regulators represents an effective strategy to reverse drug resistance.In this review,we mainly summarize the roles of epigenetic regulation in tumor resistance.In addition,as the essential factors for epigenetic modifications,histone demethylases mediate the histone or genomic DNA modifications.Herein,we comprehensively describe the functions of the histone demethylase family including the lysine-specific demethylase family,the Jumonji C-domain-containing demethylase family,and the histone arginine demethylase family,and fully discuss their regulatory mechanisms related to cancer drug resistance.In addition,therapeutic strategies,including small-molecule inhibitors and small interfering RNA targeting histone demethylases to overcome drug resistance,are also described. 展开更多
关键词 EPIGENETIC drug overcome
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高校学生冰上课心理障碍的产生与克服 被引量:11
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作者 张力 王贵成 杨香坤 《冰雪运动》 2010年第1期78-80,共3页
根据冰上课教学的特殊性、复杂性,对高校学生冰上课心理障碍产生的原因进行分析,从提高教师自身素质和培养学生正确学习动机入手,注重抓好冰上课主要环节的教学,合理选择分层、分组教学方法和手段,坚持循序渐进、因材施教的教学原... 根据冰上课教学的特殊性、复杂性,对高校学生冰上课心理障碍产生的原因进行分析,从提高教师自身素质和培养学生正确学习动机入手,注重抓好冰上课主要环节的教学,合理选择分层、分组教学方法和手段,坚持循序渐进、因材施教的教学原则。加强对学生自我保护和课堂纪律教育,使学生能够努力克服冰上课心理障碍,学会滑冰的技术、提高技能,确保冰上课的教学质量。 展开更多
关键词 高校学生 冰上课 心理障碍 克服
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克服速度滑冰运动员赛前状态焦虑的方法 被引量:10
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作者 李军 蒙猛 《冰雪运动》 2008年第3期64-66,共3页
采用文献资料、专家访谈等方法探究速度滑冰运动员克服赛前状态焦虑的方法,为增强速度滑冰运动员赛前心理准备提供理论依据。针对速度滑冰运动员在比赛前产生的状态焦虑现象,通过运用控制应激源法、表象调节法、自我暗示调节法、培养瓦... 采用文献资料、专家访谈等方法探究速度滑冰运动员克服赛前状态焦虑的方法,为增强速度滑冰运动员赛前心理准备提供理论依据。针对速度滑冰运动员在比赛前产生的状态焦虑现象,通过运用控制应激源法、表象调节法、自我暗示调节法、培养瓦伦达心态、预防Choking现象、建立心理准备程序等方法进行调节,减少赛前焦虑对运动员产生的不良影响,以促进运动员在比赛中取得优异的运动成绩。 展开更多
关键词 克服 速度滑冰运动员 赛前状态焦虑 方法 探究
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拳击训练中克服运动员恐惧心理的途径与对策研究 被引量:10
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作者 白永刚 哈达巴特尔 《齐齐哈尔师范高等专科学校学报》 2012年第4期33-34,共2页
在拳击训练中,运动员的恐惧心理时有产生,如果不缓解和消除这种恐惧心理,会对训练的效果产生不良的影响。基于此,本文过运动员在拳击训练中产生恐惧心理的原因进行调查分析,并提出相应的缓解于消除其恐惧心理的途径与对策,目的在于为提... 在拳击训练中,运动员的恐惧心理时有产生,如果不缓解和消除这种恐惧心理,会对训练的效果产生不良的影响。基于此,本文过运动员在拳击训练中产生恐惧心理的原因进行调查分析,并提出相应的缓解于消除其恐惧心理的途径与对策,目的在于为提高拳击训练的效果,促进运动员拳击运动水平的健康发展,提供必要的借鉴与参考。 展开更多
关键词 拳击训练 克服 恐惧心理 途径 对策
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