检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

我国幼儿园体育课程探究

体育文化导刊 2024年第6期 102-110页

作者：谷长伟谢慧松首都师范大学学前教育学院北京100048 北京体育大学中国田径运动学院北京100084

运用文献资料、个案分析、专家访谈等方法,探究我国幼儿园体育课程的价值、困境及实施路径。价值:培养幼儿核心素养,促进幼儿基本动作技能发展,实现体育课程内容幼小衔接。困境:目标相对明确,但实践性较差;内容选择随意性大,资源库建设... 详细信息

运用文献资料、个案分析、专家访谈等方法,探究我国幼儿园体育课程的价值、困境及实施路径。价值:培养幼儿核心素养,促进幼儿基本动作技能发展,实现体育课程内容幼小衔接。困境:目标相对明确,但实践性较差;内容选择随意性大,资源库建设意识薄弱;课程评价不够完善,体育课程的“学前性”不足。实施路径:细化课程目标,突出实践性;整体建构课程内容,加强资源库建设;引入课程审议,探索综合评价。

关键词：体育教育体育课程幼儿园

Pr,Yb,Ho:GdScO_(3)晶体生长及光谱性能

在线全文

学校读者我要写书评

暂无评论

物理学报 2024年第5期73卷 369-374页

作者：孙贵花 †张庆礼罗建乔王小飞谷长江中国科学院合肥物质科学研究院安徽光学精密机械研究所安徽省光子器件与材料重点实验室合肥230031 先进激光技术安徽省实验室合肥230031

2.7-3.0μm波段激光在很多领域具有重要应用,为探索和发展该波段新型晶体材料,本文采用提拉法生长出Pr,Yb,Ho:GdScO_(3)晶体,通过共掺入Pr3+离子以达到衰减Ho^(3+):^(5)I_(7)能级寿命的目的.采用X射线衍射测试得到了晶体的粉末衍射数据... 详细信息

2.7-3.0μm波段激光在很多领域具有重要应用,为探索和发展该波段新型晶体材料,本文采用提拉法生长出Pr,Yb,Ho:GdScO_(3)晶体,通过共掺入Pr3+离子以达到衰减Ho^(3+):^(5)I_(7)能级寿命的目的.采用X射线衍射测试得到了晶体的粉末衍射数据,测量了拉曼光谱,并对晶体的拉曼振动峰进行指认,对Pr,Yb,Ho:GdScO_(3)晶体的透过光谱、发射光谱和荧光寿命进行表征.Yb^(3+)的最强吸收峰在966 nm,吸收峰半峰宽为90 nm;2.7-3.0μm波段最强发射峰在2850 nm,半峰宽为70 nm;Ho^(3+):^(5)I_(6)和^(5)I_(7)能级寿命分别为1094μs和56μs.与Yb,Ho:GdScO_(3)晶体相比,Yb^(3+)的吸收峰和2.7-3.0μm的发射峰半峰宽明显展宽,同时下能级寿命显著减小,计算表明Ho^(3+):^(5)I_(7)与Pr^(3+):^(3)F_(2)+^(3)H_(6)能级之间能实现高效的能量传递.以上结果表明Pr,Yb,Ho:GdScO_(3)晶体是性能更优异的2.7-3.0μm波段激光材料.

关键词： 2.7—3.0μm激光 Pr,Yb,Ho:GdScO_(3)晶体晶体生长光谱性能

维普期刊数据库博看期刊

Mastering lanthanide energy states for next-gen photonic innovation

在线全文

学校读者我要写书评

暂无评论

中国科学:化学英文版 2023年第9期66卷 2460-2479页

作者： Yuyang gu chang gu Yuxiang Zhang Zhen Mu Xiaogang Liu Department of Chemistry National University of SingaporeSingapore 117543Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and ResearchSingapore 138634Singapore

Lanthanide-based photonic materials have been extensively explored for use in laser crystals,lighting,fiber-optic communications,bioimaging,diagnostics,and many other *** recent years,they have enabled numerous breakthroughs in areas such as single-particle spectroscopy,super-resolution imaging,micro-lasing,lifetime multiplexing,and ***,we summarize recent advances in lanthanide photonic materials from an energy state perspective,focusing on the interplay between energy state manipulation and advanced photonic *** then discuss the challenges and prospects for controlling energy states at the single-particle *** wish to highlight the importance of quantifying and understanding the energy states of lanthanides for future innovations.

关键词： lanthanide nanomaterials super-resolution lifetime lasing

在线全文

学校读者我要写书评

暂无评论

混联支路并联腿运动学分析与尺度综合

机械设计与制造 2024年第3期 94-99页

作者：顾昌利赵佳毅饶晓波高建设郑州大学机械与动力工程学院河南郑州450001

针对步行机器人在核环境下作业时,动力源分散,不便于防护的问题,提出一种动力源集中布置,可用于构建步行机器人的四自由度混联支路并联腿部机构。运用螺旋理论分析其自由度数目、性质及机构特性。建立了运动学反解模型,并分别推导出驱... 详细信息

针对步行机器人在核环境下作业时,动力源分散,不便于防护的问题,提出一种动力源集中布置,可用于构建步行机器人的四自由度混联支路并联腿部机构。运用螺旋理论分析其自由度数目、性质及机构特性。建立了运动学反解模型,并分别推导出驱动空间和关节空间的速度雅克比矩阵。以两个雅克比矩阵条件数为基础,提出了一种带权重的混合条件数,用于综合评价机构的力传递与运动传递性能。以混合条件数最小为尺度综合目标,先通过单调性分析得到结构参数的取值区间,再应用粒子群优化算法获得一组最优结构参数,为样机加工和其他混联支路并联机构尺度综合提供参考。该新型腿部机构动力源统一后置,便于集中防护,驱动空间具有驱动置换功能和半解耦特性,便于实现位姿控制,在核辐射、高温等恶劣环境下有着良好的应用前景。

关键词：核机器人混联支路运动学分析尺度综合步行机器人

Adoptability and limitation of cancer treatment guidelines： a Chinese oncologist＇s perspective

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2012年第5期125卷 725-727页

作者： DU chang-zheng gu Jin Department of Colorectal Surgery Peking University School of Oncology Beijing Cancer Hospital and Institute Beijing 100142China

In recent years, great progress has been made in the treatment of cancer; one of the significant reasons isthe wide adaptation and implementation of standardized treatment based on high-level clinical evidence. Undoubtedly, the advent of guidelines that represent the achievement of the latest and highest quality clinical studies made a significant contribution to the improvement of cancer treatment and management. Aside from cancer patient care, guidelines have also been widely used as standards diagnosis and treatment or primary references in the of other diseases. Numerous guidelines are being enacted each year by a variety of guideline-makers, including national, regional and international academic organizations, medical associations, as well as research institutions and hospitals.

关键词： cancer treatment guideline Chinese

钙(Ⅱ)和铜(Ⅱ)吡嗪-2-甲酸配合物的合成、结构和性能研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

化学研究与应用 2024年第8期36卷 1851-1860页

作者：陈美娟郭铭成谷长生郝晓敏广东海洋大学化学与环境学院广东湛江524088

配体吡嗪-2-甲酸将其与CaCl_(2)和CuSO_(4)·5H_(2)O在水溶液中反应得到了两个新的单核钙和铜配合物。并通过X-射线单晶衍射、红外和元素分析表征了其晶体结构。配合物1为一个Ca(Ⅱ)离子与二个配体和四个配位水分子形成的单核结构,配合... 详细信息

配体吡嗪-2-甲酸将其与CaCl_(2)和CuSO_(4)·5H_(2)O在水溶液中反应得到了两个新的单核钙和铜配合物。并通过X-射线单晶衍射、红外和元素分析表征了其晶体结构。配合物1为一个Ca(Ⅱ)离子与二个配体和四个配位水分子形成的单核结构,配合物2为一个Cu(Ⅱ)离子与一个配体和一个配位水分子形成的单核结构,单核结构之间通过O—H…H、N—H…H氢键作用组装成三维超分子网络结构。测试了配合物的紫外可见光和荧光吸收及配合物2非均相类Fenton试剂的催化性质。测试结果表明,两个配合物在不同溶剂中紫外可见吸收峰均在268 nm,配合物1固态荧光发射峰在414 nm和441 nm及配合物1和2在不同溶剂中荧光发射峰均为364 nm。含Cu(Ⅱ)的配合物2对甲基橙(MO)溶液可以达到81.76%的降解率,显示了良好的类Fenton催化性质,表明其是一种潜在的催化降解有机污染物材料。

关键词： Ca(Ⅱ)配合物 Cu(Ⅱ)配合物吡嗪羧酸催化降解

Entrainment range affected by the heterogeneity in the amplitude relaxation rate of suprachiasmatic nucleus neurons

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第1期28卷 663-668页

作者： chang-gui gu Ping Wang Hui-Jie Yang Business School University of Shanghai for Science and Technology

Adaption of circadian rhythms in behavioral and physiological activities to the external light–dark cycle is achieved through the main clock, i.e., the suprachiasmatic nucleus(SCN) of the brain in mammals. It has been found that the SCN neurons differ in the amplitude relaxation rate, which represents the rigidity of the neurons to the external amplitude disturbance. Thus far, the appearance of that difference has not been explained. In the present study, an alternative explanation based on the Poincare′ model is given which takes into account the effect of the difference in the entrainment range of the SCN. Both our simulation results and theoretical analyses show that the largest entrainment range is obtained with suitable difference in the case that only a part of SCN neurons are sensitive to the light information. Our findings may give an alternative explanation for the appearance of that difference(heterogeneity) and shed light on the effects of the heterogeneity in the neuronal properties on the collective behaviors of the SCN neurons.

关键词： amplitude relaxation rate entrainment range heterogeneity

在线全文

学校读者我要写书评

暂无评论

Intraocular lymphoma

International Journal of Ophthalmology(English edition) 2017年第8期10卷 1301-1307页

作者： Li-Juan Tang chang-Lin gu Ping Zhang Department of Ocular Pathology State Key Laboratory of Ophthalmology Zhongshan Ophthalmic Center Sun Yat-sen University Guangzhou 510060 Guangdong Province China Department of Traditional Chinese Medicine the Second Health Service Center of Tangxia Tianhe District Guangzhou510665 Guangdong Province China

Intraocular lymphoma （IOL） is a rare lymphocytic malignancy which contains two main distinct forms. Primary intraocular lymphoma （PIOL） is mainly a sub- type of primary central nervous system lymphoma （PCNSL）. Alternatively, IOL can originate from outside the central nervous system （CNS） by metastasizJng to the eye. These tumors are known as secondary intraocular lymphoma （SlOL）. The IOL can arise in the retina, uvea, vitreous, Bruch＇s membrane and optic nerve. There are predominantly of B-cell origin; however there are also rare T-cell variants. Diagnosis remains challenging for ophthalmologists and pathologists, due to its ability to masquerade as noninfectious or infectious uveitis, white dot syndromes, or occasionally as other metastatic cancers. Laboratory tests include flow cytometry, immunocytochemistry, interleukin detection （IL-10： IL-6, ratio 〉1）, and polymerase chain reaction （PER） amplification. Methotrexate-based systemic chemotherapy with external beam radiotherapy and intravitreal chemotherapy with methotrexate are useful for controlling the disease, but the prognosis remains poor. Therefore, it is important to make an early diagnose and treatment. This review is focused on the clinical manifestations, diagnosis, treatment and prognosis of the IOL.

关键词： intraocular lymphoma central nervous system diagnosis treatment prognosis

Ratio Between Sensitive Strength to Light Information and Coupling Strength Affects Entrainment Range of Suprachiasmatic Nucleus

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2018年第12期69卷 771-776页

作者： chang-gui gu Hui-Jie Yang Man Wang Business School University of Shanghai for Science and Technology School of Foreign Languages and Literature Shandong University

The suprachiasmatic nucleus(SCN), an endogenous clock in the brain of the mammals, regulates the physiological and behavioral activities according to the natural 24 h light-darkness cycle. Animals can also entrain themselves to non 24 h light-darkness cycles. The range of the periods which the animal can entrain to is called entrainment range. Previous studies have found that the entrainment range depends on the coupling strength and the sensitive strength to the light for the SCN neurons. However, the effect of the interplay between these two strengths on the entrainment range has not been examined. In the present study, we examine the effect of the ratio of the sensitive strength to the coupling strength on the entrainment range. We find that there is a parabolic-like relationship between the entrainment range and the ratio, and the largest entrainment range is obtained with a suitable ratio. Interestingly,the value of this suitable ratio is related to the comparison in the intrinsic amplitudes between the light information sensitive neurons and the light information insensitive neurons. Our finding will shed light on the interplay between the sensitive strength to the light information and the coupling strength, and the understanding for the diversity of the entrainment range among various species.

关键词： biological rhythms neuronal network nonlinear dynamics entrainment range