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The Social Identity Approach to Effective Leadership： An Overview and Some Ideas on Cross-Cultural Generalizability

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Frontiers of Business Research in China 2016年第3期10卷 363-384页

作者： Rolf van dick Rudolf Kerschreiter Department of'Psychology Goethe University 60323 Frankfurt Germany Work ResearchInstitute (AFI) Oslo Norway Department of Education and Psychology Freie Universitat Berlin 14195 Berlin Germany

When employees identify with the groups and organizations they work for, this typically has positive implications for work-related attitudes and behaviors. The present paper provides a focused overview of the social identity approach to leadership and some ideas on its cross-cultural generalizability. To this end, we will first outline the basic tenets of the social identity approach and summarize the relations of organizational identification with work-related variables. Then, we will discuss the role of social identity-related concepts for effective leadership. In particular, we will present empirical studies on the following three aspects：（1） the transfer of leader identification onto their followers, （2） the role of leader prototypicality, and （3） the ways for leaders to actively manage the identities of the groups they lead. Finally, we will provide some suggestions on how to implement the principles of identity management into practice and offer suggestions for future research, with a special focus on China.

关键词： social identity theory leadership identity management socialidentity model of leadership leader-identity-transfer model

Tailor made concrete structures : +New solutions for our society / +Edited by Joost C. Walraven, dick Stoelhorst.

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Tailor made concrete structures : +New solutions for our soc...

考虑随机模型精化的精密GPS动态定位新方法(英文)

1000年

作者： Edited by Joost C. Walraven dick Stoelhorst.

Includes index.

ISBN: (纸本)041547535X (hbk.) :;9780415475358 (hbk.) :

Includes index.

关键词： Technology. Structural engineering.

来源：畅想之星图书光盘版（南... 评论

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测绘学报 2003年第4期32卷 293-300页

作者：柳响林 DEJONG Cornelis dick 武汉大学研究中心湖北武汉430079 代尔夫特理工大学数学大地测量与空间定位系

GPS动态定位要求建立函数模型和随机模型。函数模型描述的是观测值和待估参数之间的物理和几何关系,随机模型描述了GPS观测值的统计特征,并通过观测值的方差协方差给定了每个观测值对最后的定位结果的贡献。正确给定函数模型和随机模型... 详细信息

GPS动态定位要求建立函数模型和随机模型。函数模型描述的是观测值和待估参数之间的物理和几何关系,随机模型描述了GPS观测值的统计特征,并通过观测值的方差协方差给定了每个观测值对最后的定位结果的贡献。正确给定函数模型和随机模型对于GPS定位结果的估计和观测值的粗差探测均至关重要。由于有各种误差存在于伪距和载波相位观测值中,一般GPS动态定位模型均采用双差观测值来构建函数模型。有时候,仔细地使用单差观测值,较之双差观测值有更多的优点,给出了选用单差观测值的理由。但是单差观测值给函数模型带来了接收机钟差,如果直接使用单差观测方程,设计矩阵是奇异的。为了解决这个问题,将伪距观测值中接收机钟差项和接收机延迟项合并为一个新的未知参数。至于载波相位观测值,首先选定一个参考卫星,然后在观测方程的右端同时增加一正一负的参考卫星单差整周模糊度,将正项与接收机钟差项和接收机延迟项合并为一个新的未知参数,将负项和原观测方程中的单差整周模糊度项合并为双差整周模糊度,而参考卫星观测方程的模糊度项则为零,这样无须组建双差观测值,软件实现较容易,也可以直接使用LAMBDA法求整周模糊度,最终也解决了观测方程奇异的问题。准确理解观测值的统计特征是建立GPS随机模型的基础。

关键词：随机模型精化 GPS 动态定位单差信噪比

Antimalarial potency of the leaf extract of Aspilia africana(Pers.) ***

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Asian Pacific Journal of Tropical Medicine 2012年第2期5卷 126-129页

作者： Akuodor Godwin Christian Amos Grace Mfon Essien Augustine dick Essien David-Oku Akpan Joseph Linus Ezeokpo Basil Chukwuma Department Pharmacology College of Medical SciencesUniversity of CalabarNigeria Department of Pharmacology and Toxicology National Institute for Pharmaceutical Research and Development(NIPRD)AbujaNigeria Department of Biochemistry College of Medical SciencesUniversity of CalabarNigeria Department of Pharmacology and Therapeutics Faculty of Clinical MedicineEbonyi State UniversityAbakalikiNigeria

Objective:To investigate the antimalarial activity of ethanol extract of Aspilin africana (***) ***:The ethanol extract of *** leaf(100-400 mg/kg) was screened for blood schizonticidal effect against chloroquine-sensitive Plasmodium berghei(P. berghei) in mice both in early and established models of antimalarial ***:The leaf extract exhibited significant(P<0.05) antiplasmodial activity in 4-day early infection and in established infection tests with a considerable mean survival time comparable to that of standard drug,chloroquine(10 mg/kg).Conclusions:The findings show thai ethanol extract of *** leaf possesses potent antiplasmodial activity which justify the use in ethnomedicine and can be developed in malaria therapy.

关键词： Aspilia africana Herbal medicine Plasmodium berghei Mice

In vivo antiplasmodial activity of Bombax buonopozense root bark aqueous extract in mice infected by Plasmodium berghei

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Journal of Traditional Chinese Medicine 2017年第4期37卷 431-435页

作者： Akuodor Godwin Christian Ezeonu Chinonyelum Thecla Essien Augustine dick Asika Ebere Chile Chilaka Kingsley Chimsorom Nwachukwu Daniel Ckukwu Nwobodo Ndubuisi Nwobodo Department of Pharmacology and Therapeutics Faculty of Medicine Ebonyi State UniversityAbakaliki P.M.B. 053 Nigeria Department of Paediatrics Faculty of Medicine Ebonyi State University Abakaliki RM.B.053 Nigeria Department of Pharmacology College of Medical Sciences University of Calabar Calabar P.M.B. 1115 Nigeria Department of Pharmacology and Therapeutics College of Health Sciences Nnamdi Azikiwe University Awka P.M.B. 5025 Nigeria Department of Physiology College of Medicine University of Nigeria Enugu P.M.B. 1011 Nigeria

OBJECTIVE: To evaluate the in vivo antiplasmodial activity and the oral acute toxicity of the Bombax buonopozense root bark aqueous ***: The in vivo antiplasmodial activity of the root bark aqueous extract of Bombax buonopozense against early and established rodent malaria infections in chloroquine sensitive Plasmodium berghei strain in mice was investigated, and oral acute toxicity of the aqueous root bark extract of Bombax buonopozense was also evaluated in ***: The findings of this study revealed significant(P < 0.05) and dose dependent decrease in parasitaemia in the parasitized groups treated with varying doses of the extract(50-200 mg/kg p.o.) in both suppressive and curative tests. There was also significant decrease in parasitaemia density in the chloroquine treated group. The aqueous extract was found no toxicity in mice and the oral LD50 was determined to be greater than 5000 mg/***: Bombax buonopozense root bark aqueous extract possesses potent antiplasmodial activity and may therefore, serve as potential sources of new antimalarial agents.

关键词： Plasmodium berghei Bombax Plant extracts Phytochemicals Toxicity tests, acute

VLES Modelling with the Renormalization Group

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Journal of Thermal Science 2003年第4期12卷 328-331页

作者： Chris De Langhe rug.ac.be Bart Merci rug.ac.be Koen Lodefier rug.ac.be Erik dick rug.ac.be Ghent University Dept. of Flow Heat and Combustion Mechanics Sint-Pietersnieuwstraat 41 B-9000 Gent Belgium

In a Very-Large-Eddy Simulation (VLES), the filterwidth-wavenumber can be outside the inertial range, and simple subgrid models have to be replaced by more complicated (''RANS-like'') models which can describe the transport of the biggest eddies. One could approach this by using a RANS model in these regions, and modify the lengthscale in the model for the LES-regions. The problem with these approaches is that these models are specifically calibrated for RANS computations, and therefore not suitable to describe inertial range quantities. We investigated the construction of subgfid viscosity and transport equations without any calibrated constants, but these are calculated directly form the Navier-Stokes equation by means of a Renormalization Group (RG) procedure. This leads to filterwidth dependent transport equations and effective viscosity with the right limiting behaviour (DNS and RANS limits).

关键词： very-large-eddy simulation subgrid modellig k-εmodel.

Synergistic effects of magnesium ions and simvastatin on attenuation of high-fat diet-induced bone loss

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Bioactive Materials 2021年第8期6卷 2511-2522页

作者： Bingyang Dai Xu Li Jiankun Xu Yuwei Zhu Le Huang Wenxue Tong Hao Yao dick Ho-kiu Chow Ling Qin Musculoskeletal Research Laboratory of Department of Orthopedics&Traumatology and Innovative Orthopaedic Biomaterial&Drug Translational Research Laboratory Li Ka Shing Institute of Health SciencesThe Chinese University of Hong KongHong KongChina Department of Chemistry The Chinese University of Hong KongNew TerritoriesHong KongChina

Introduction:Magnesium(Mg)has a prophylactic potential against the onset of *** to statin,Mg is recommended as lipid-lowering medication for hypercholesterolemia and concomitantly exhibits an association with increased bone *** combination of statin with Mg ions(Mg^(2+))may be able to alleviate the high-fat diet(HFD)-induced bone loss and reduce the side-effects of *** study aimed to explore the feasibility of combined Mg^(2+)with simvastatin(SIM)for treating HFD-induced bone loss in mice and the involving *** and methods:C57BL/6 male mice were fed with a HFD or a normal-fat diet(NFD).Mice were intraperitoneally injected SIM and/or orally received water with additional Mg^(2+)until ***-linked immunosorbent assay was performed to measure cytokines and cholesterol in serum and liver *** mineral density(BMD)and microarchitecture were assessed by micro-computed tomography(μCT)in different *** adipogenesis in palmitate pre-treated HepG2 cells was performed under various ***:μCT analysis showed that the trabecular bone mass was significantly lower in the HFD-fed group than that in NFD-fed group since week *** cortical thickness in HFD-fed group had a significant decrease at week 24,as compared with NFD-fed *** combination of Mg^(2+)and SIM significantly attenuated the trabecular bone loss in HFD-fed mice via arresting the osteoclast formation and bone ***,such combination also reduced the hepatocytic synthesis of cholesterol and inhibited matrix metallopeptidase 13(Mmp13)mRNA expression in ***:The combination of Mg^(2+)and SIM shows a synergistic effect on attenuating the HFD-induced bone *** current formulation may be a cost-effective alternative treatment to be indicated for obesity-related bone loss.

关键词： Obesity Bone loss Magnesium Simvastatin Trabecular bone Cholesterol

Human Brain Slice Culture: A Useful Tool to Study Brain Disorders and Potential Therapeutic Compounds

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Neuroscience Bulletin 2019年第2期35卷 244-252页

作者： Xin-Rui Qi Ronald W.H.Verwer Ai-Min Bao Rawien A.Balesar Sabina Luchetti Jiang-Ning Zhou dick F.Swaab Center for Translational Neurodegeneration and Regenerative Therapy Shanghai Tenth People's Hospital Affiliated to Tongji University School of Medicine Department of Neuropsychiatric Disorders Netherlands Institute for NeuroscienceAn Institute of the Royal Netherlands Academy of Arts and Sciences Department of Neurobiology Institute of NeuroscienceNHC and CAMS Key Laboratory of Medical NeurobiologyZhejiang University School of Medicine Key Laboratory of Brain Function and Diseases School of Life SciencesUniversity of Science and Technology of ChinaChinese Academy of Sciences

Investigating the pathophysiological mechanisms underlying brain disorders is a priority if novel therapeutic strategies are to be developed. In vivo studies of animal models and in vitro studies of cell lines/primary cell cultures may provide useful tools to study certain aspects of brain disorders. However, discrepancies among these studies or unsuccessful translation from animal/cell studies to human/clinical studies often occur, because these models generally represent only some symptoms of a neuropsychiatric disorder rather than the complete disorder. Human brain slice cultures from postmortem tissue or resected tissue from operations have shown that, in vitro, neurons and glia can stay alive for long periods of time, while their morphological and physiological characteristics, and their ability to respond to experimental manipulations are maintained. Human brain slices can thus provide a close representation of neuronal networks in vivo, be a valuable tool for investigation of the basis of neuropsychiatric disorders, and provide a platform for the evaluation of novel pharmacological treatments of human brain diseases.A brain bank needs to provide the necessary infrastructure to bring together donors, hospitals, and researchers who want to investigate human brain slices in cultures of clinically and neuropathologically well-documented material.

关键词： Alzheimer’s disease Brain bank Brain-derived neurotrophic factor Depression Electrical activity Human brain slice culture Neuropsychiatric disorders Organotypic culture Postmortem human brain tissue Resected human brain tissue

慢速扩张脊下的复杂熔-岩相互作用:来自大西洋北纬14°97′区段洋中脊含铬铁矿纯橄岩的记录

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地质学报 2022年第12期96卷 4242-4256页

作者：周翔郑建平熊庆刘文龙 Henry J B dick 中国地质大学(武汉)地球科学学院地质过程与矿产资源国家重点实验室湖北武汉430074 美国伍兹霍尔海洋研究所地质与地球物理系美国马萨诸塞伍兹霍尔02540

在大西洋洋中脊北纬14°97′附近贫岩浆型慢速扩张脊区段的洋底岩石调查中,拖网取样及洋底钻探均发现蛇纹石化地幔岩石中有脉状纯橄岩。纯橄岩中的铬铁矿粒度以毫米级为主,个别颗粒直径接近厘米级别,成分上显示中等程度的铬值与镁值(Cr#... 详细信息

在大西洋洋中脊北纬14°97′附近贫岩浆型慢速扩张脊区段的洋底岩石调查中,拖网取样及洋底钻探均发现蛇纹石化地幔岩石中有脉状纯橄岩。纯橄岩中的铬铁矿粒度以毫米级为主,个别颗粒直径接近厘米级别,成分上显示中等程度的铬值与镁值(Cr#=52.2~56.1;Mg#=44.6~51.5)较高的TiO_(2)含量(0.60%~0.91%)。铬铁矿内部包裹体中大量出现韭闪石+金云母组合,并发现自形磷灰石包裹体。这些特征与“俯冲带型铬铁矿”的成分特征及矿物包裹体组合非常类似。本文的样品观察说明在洋中脊下方的熔体通道内,高度演化的熔体可以形成小体积的富水岩浆并参与铬铁矿的形成。拖网调查与钻探研究证实,研究区的纯橄岩、异剥橄榄岩、富橄榄石橄长岩、辉石岩、辉长岩及橄榄辉长岩等均以脉体形式产于难熔的大洋岩石圈橄榄岩质地幔中。这些脉状岩石共同记录了洋中脊玄武质熔体向上迁移过程中与围岩方辉橄榄岩间的熔-岩反应,属于“交代橄榄岩”的范畴,揭示了慢速扩张洋脊之下熔体迁移诱发的复杂熔-岩相互作用。

关键词：洋中脊铬铁矿大西洋熔-岩作用