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

大企业:高效扩展本地创新

企业家信息 2024年第1期 92-93页

作者：沙里亚尔·帕尔瓦兰德克里斯汀·科莱拉大卫·邓肯贾慧娟(翻译) 不详成长战略咨询公司

规模效应的商业优势是公认的,但大型全球企业在创新方面往往没有充分认识到这一点。一个地区或业务部门开发的创新,即受客户欢迎的新产品、吸引和留住人才的新人力资源政策、提高效率的新生产流程,这些往往都停留在这个区域或部门,而不... 详细信息

规模效应的商业优势是公认的,但大型全球企业在创新方面往往没有充分认识到这一点。一个地区或业务部门开发的创新,即受客户欢迎的新产品、吸引和留住人才的新人力资源政策、提高效率的新生产流程,这些往往都停留在这个区域或部门,而不是在整个企业中传播。

关键词：人力资源政策规模效应吸引和留住人才生产流程提高效率业务部门商业优势创新

SnapshotPrune: A Novel Bitcoin-Based Protocol Toward Efficient Pruning and Fast Node Bootstrapping

维普期刊数据库人大复印报刊资料评论

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2024年第4期29卷 1037-1052页

作者： Pengfei Huang Xiaojun Ren Teng Huang Arthur Sandor Voundi Koe duncan S Wong Hai Jiang Institute of Artificial Intelligence and Blockchain Guangzhou UniversityGuangzhou 510006China Institute of Artificial Intelligence and Blockchain Guangzhou UniversityGuangzhou 510006Chinaand also with Pazhou LabGuangzhou 510330China

Node synchronization is essential for the stability of the Bitcoin network. Critics have raised doubts about the ability of a new node to quickly and efficiently synchronize with the Bitcoin network and alleviate the storage pressure from existing full nodes to stockpile new data. Basic pruning and other techniques have been explored to address these concerns but have been insufficient to reduce node synchronization delay and effectively suppress the growth of synchronized data. In this study, we propose SnapshotPrune, a novel pruning and synchronization protocol that achieves fast node bootstrapping in the Bitcoin blockchain. Real Bitcoin historical data are leveraged to measure the synchronization time and monitor the network traffic during node bootstrapping. The protocol requires data downloads that are 99.70% less than Bitcoin Core, 81% less than CoinPrune, and 60% less than SnapshotSave, thereby saving 97.23% of download time. Findings show that the proposed design enhances the storage efficiency and reduces the node synchronization delay compared with existing techniques. We hypothesize that the efficiency of this protocol increases with the block height.

关键词： synchronization blockchain Unspent Transaction Output(UTXO)pruning snapshot fast bootstrapping

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

大脑神秘之旅

环境 2009年第8期 82-83页

作者： david Ewing duncan 晓惠

人,就是这个世界上最大的秘密。近日,研究学者们利用核磁共振的手段,对人类的大脑思想进行了一次紧密追踪,发现了人们大脑中的一些"秘密"。就让我们跟随其中一名参加实验者——作家david Ewing duncan的娓娓而谈,来窥望一下主宰人类喜... 详细信息

人,就是这个世界上最大的秘密。近日,研究学者们利用核磁共振的手段,对人类的大脑思想进行了一次紧密追踪,发现了人们大脑中的一些"秘密"。就让我们跟随其中一名参加实验者——作家david Ewing duncan的娓娓而谈,来窥望一下主宰人类喜怒哀乐、生死存亡的大脑中,都藏着哪些不为人知的秘密吧:

关键词：大脑核磁共振人类

在线全文

学校读者我要写书评

暂无评论

窃密风云:谁偷了你的基因?

疯狂英语（阅读版） 2014年第8期 10-14页

作者： david Ewing duncan 铖铖

轰动全球的＂斯诺登泄密事件＂已经过去一年,但对于美国政府对外国元首、民众以及本国人民的监听、窃密行为,人们依然大为愤慨。网络时代,个人信息的泄露、窃取,甚至盗用现象已是屡见不鲜。随着科技的发达,代表我们生命特征的基因密码... 详细信息

轰动全球的＂斯诺登泄密事件＂已经过去一年,但对于美国政府对外国元首、民众以及本国人民的监听、窃密行为,人们依然大为愤慨。网络时代,个人信息的泄露、窃取,甚至盗用现象已是屡见不鲜。随着科技的发达,代表我们生命特征的基因密码也正逐步成为个人信息的一部分,那是否预示着我们终将陷入DNA的失守危机呢？

关键词：基因个人信息泄密事件外国元首美国政府网络时代生命特征 DNA

Cannabinoids and endocannabinoids as therapeutics for nervous system disorders:preclinical models and clinical studies

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第4期19卷 788-799页

作者： R.Scott duncan Sean M.Riordan Matthew C.Gernon Peter Koulen Department of Ophthalmology School of MedicineUniversity of Missouri Department of Biomedical Sciences School of MedicineUniversity of Missouri

Cannabinoids are lipophilic substances derived from Cannabis sativa that can exert a variety of effects in the human *** have been studied in cellular and animal models as well as in human clinical trials for their therapeutic benefits in several human *** of these include central nervous system(CNS)diseases and dysfunctions such as forms of epilepsy,multiple sclerosis,Parkinson’s disease,pain and neuropsychiatric *** addition,the endogenously produced cannabinoid lipids,endocannabinoids,are critical for normal CNS function,and if controlled or modified,may represent an additional therapeutic avenue for CNS *** review discusses in vitro cellular,ex vivo tissue and in vivo animal model studies on cannabinoids and their utility as therapeutics in multiple CNS *** addition,the review provides an overview on the use of cannabinoids in human clinical trials for a variety of CNS *** and endocannabinoids hold promise for use as disease modifiers and therapeutic agents for the prevention or treatment of neurodegenerative diseases and neurological disorders.

关键词： anandamide cannabidiol cannabinoid endocannabinoid epilepsy multiple sclerosis neurodegeneration neuroprotection tetrahydrocannabinol

在线全文

学校读者我要写书评

暂无评论

尿布背后的男人

疯狂英语（阅读版） 2007年第5期 28-31页

作者： david C.duncan 雪桐

我真的很努力地做“家庭主父”。我修剪草坪,给汽车加油。这一切都做得很好。然而让我感到沮丧的是,我妻子一日三餐都不做饭,也真的不清楚自己有何责任。

关键词：尿布男人主父家庭收入妻子调味品工作蛋黄酱家务朋友

Olympic Games and 24-hour movement behaviors:A match worth making

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2024年第6期13卷 728-731页

作者： Mark S.Tremblay Nicholas Kuzik Markus J.duncan Diego Augusto Santos Silva CHEO Research Institute OttawaON K1H 8L1Canada Department of Pediatrics University of OttawaOttawaON K1H 8L1Canada Federal University of Santa Catarina FlorianopolisSanta Catarina 88040-900Brazil

*** The Olympic motto,"Faster,Higher,Stronger-Together",represents the pursuit of athletic excellence,united as a global community."Excellence,respect and friendship"are the Olympic *** the motto and values are multifaceted and holistic in nature,and all-encompassing in their reach while recognizing no single entity rises above the ***,these foundational statements anchor the Olympic movement in its quest to build a better world through sport.

关键词： movement Together pursuit

Towards precision 24-hour movement behavior recommendations—The next new paradigm?

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2024年第6期13卷 743-748页

作者： Mark S.Tremblay Markus J.duncan Nicholas Kuzik Diego Augusto Santos Silva Valerie Carson CHEO Research Institute OttawaON K1H 8L1Canada Department of Pediatrics University of OttawaOttawaON K1H 8L1Canada Federal University of Santa Catarina Santa Catarina 88040900Brazil Faculty of Kinesiology Sportand RecreationUniversity of AlbertaEdmontonAB T6G 2H9Canada

*** The importance of physical activity(PA)for health is unequivocal.^(1)Accordingly,population-based recommendations for exercise,and more recently public health guidelines for PA,have been developed and released by authoritative groups for many decades.^(2)Such guidelines emerged with leadership from the exercise physiology discipline and were rooted in,and loyal to,the importance of moderate-to-vigorous intensity PA(MVPA)or exercise.

关键词： movement behavior exercise

Understanding the catalysis of chromium trioxide added magnesium hydride for hydrogen storage and Li ion battery applications

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第3期12卷 1117-1130页

作者： D.Pukazhselvan IhsanÇaha Catarina de Lemos Sergey M.Mikhalev Francis Leonard Deepak duncan Paul Fagg Department of Mechanical Engineering TEMA-Centre for Mechanical Technology and AutomationUniversity of AveiroAveiro 3810-193Portugal LASI-Intelligent Systems Associate Laboratory Guimarães 4800-058Portugal Nanostructured Materials Group International Iberian Nanotechnology Laboratory(INL)Avenida Mestre Jose VeigaBraga 4715-330Portugal

This study explores how the chemical interaction between magnesium hydride(MgH_(2))and the additive CrO_(3) influences the hydrogen/lithium storage characteristics of MgH_(2).We have observed that a 5 wt.%CrO_(3) additive reduces the dehydrogenation activation energy of MgH_(2) by 68 kJ/mol and lowers the required dehydrogenation temperature by 80℃.CrO_(3) added MgH_(2) was also tested as an anode in an Li ion battery,and it is possible to deliver over 90%of the total theoretical capacity(2038 mAh/g).Evidence for improved reversibility in the battery reaction is found only after the incorporation of additives with MgH_(2).In depth characterization study by X-ray diffraction(XRD)technique provides convincing evidence that the CrO_(3) additive interacts with MgH_(2) and produces Cr/MgO *** free energy analyses confirm the thermodynamic feasibility of conversion from MgH_(2)/CrO_(3) to MgO/Cr,which is well supported by the identification of Cr(0)in the powder by X ray photoelectron spectroscopy(XPS)*** high resolution transmission electron microscopy(HRTEM)and energy dispersive spectroscopy(EDS)we found evidence for the presence of 5 nm size Cr nanocrystals on the surface of MgO rock salt *** is also convincing ground to consider that MgO rock salt accommodates Cr in the *** observations support the argument that creation of active metal–metal dissolved rock salt oxide interface may be vital for improving the reactivity of MgH_(2),both for the improved storage of hydrogen and lithium.

关键词： Hydrogen storage Rechargeable batteries Binary hydrides Metal oxides Catalytic mechanism.