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Exploring commercial water electrolyser systems:a data-based analysis of product characteristics

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Clean Energy 2024年第1期8卷 126-133页

作者： Xin Jin Shi You Marianne Petersen Jonathan Riofrio Soumya Thakur Chresten Træholt Zhijian Feng Department of Wind and Energy Systems Technical University of Denmark2800 Kgs.LyngbyDenmark Siemens gamesa Renewable Energy A/S 7330 BrandeDenmark

The urgency for energy transition is evident through the increasing demand for new technologies such as water electrolysers(WEs),which have the potential to generate green hydrogen using renewable *** paper aims to provide a comprehensive overview of the technical capabilities of commercially available WE system *** analysis is based on publicly accessible data gathered from 28 WE manufacturers worldwide with a total of 186 products,focusing on technology types and various technical characteristics of each WE system,including capacity,footprint,hydrogen output pressure,hydrogen purity and conversion *** analysis reveals that the current WE system solutions in the market exhibit diverse and varied ***,there is a lack of standardized product specifications adopted by *** underscores the urgent need for the development of frameworks and *** such standards is crucial for enhancing clarity and understanding,facilitating efficient comparisons and selection processes,and supporting the future advancement of WE technologies and WE-enabled Power-to-X applications on a global scale.

关键词： data analysis hydrogen Power-to-X standards water electrolyser system

Oral fluoroquinolones and the risk of Achilles tendon rupture

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Journal of Sport and Health Science 2024年第6期13卷 749-750页

作者： Peter Vibe Rasmussen Jarl Emanuel Strange Anders holt Department of Cardiology Herlev-Gentofte University HospitalCopenhagen 2730Denmark Department of Cardiology Bispebjerg-Frederiksberg University HospitalCopenhagen 2400Denmark Department of Cardiology Rigshospitalet University HospitalCopenhagen 2100Denmark

Dear editor,Fluoroquinolones(FQs)are a class of antibiotics used to treat bacterial infections,such as lower respiratory,gastrointestinal,and urinary tract *** to its broad-spectrum action and wide availability,it is ... 详细信息

关键词： prescribed spectrum action

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电子调速器的最新发展

国外内燃机车 1988年第1期 30-39页

作者： g.holt 石海涛

1.导言 70年代中期,机械液压调速器广泛用于以柴油机或煤气机为动力的发电机组或船用柴油机。随着节能的需要,人们明显地看到当时市场上传统的液压调速器再也不能满足理想的调节要求。因此需要有一种新的调节方法,而当时的技术所能提... 详细信息

1.导言 70年代中期,机械液压调速器广泛用于以柴油机或煤气机为动力的发电机组或船用柴油机。随着节能的需要,人们明显地看到当时市场上传统的液压调速器再也不能满足理想的调节要求。因此需要有一种新的调节方法,而当时的技术所能提供的最佳方法就是全电子调速器这种调速器可以调节少则2或3kW,多则几MW的汽油机和柴油机。

关键词：电子调速器柴油机厂执行机构增压压力转速传感器船用柴油机输出轴柴油机转速给定值柴油机运转

New insights into calcium,dairy and colon cancer

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World Journal of gastroenterology 2008年第28期14卷 4429-4433页

作者： Peter R holt Senior Research Associate Rockefeller UniversityProfessor of Medicine (Emeritus)Columbia UniversityNew YorkNY10065United States

This paper is to review recent information about the relationship of calcium and dairy foods to colon cancer. The review focuses on primary prevention, discusses the potential components in dairy foods that might be anti-neoplastic, reviews the epidemiologic information and describes intervention studies demonstrating efficacy of calcium and vitamin D in reducing colorectal polyp recurrence. Since vitamin D is important in cancer prevention, pertinent data is discussed and potential mechanisms of actions presented. Calcium and vitamin D are important agents for the primary prevention of colorectal neoplasia.

关键词： Colorectal cancer Dairy foods Calcium Vitamin D Colorectal polyp recurrence Colon cancer prevention

Ionospheric longitudinal variations at midlatitudes: Incoherent scatter radar observation at Millstone Hill

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Science China(Technological Sciences) 2012年第5期55卷 1153-1160页

作者： COSTER Anthea holt John FOSTER John ERICKSON Phil MIT Haystack Observatory Off Route 40 Westford MA 01866 USA

Incoherent scatter radar （ISR） extra-wide coverage experiments during the period of 1978-2011 at Millstone Hill are used to investigate longitudinal differences in electron density. This work is motivated by a recent finding of the US east-west coast difference in TEC suggesting a combined effect of changing geomagnetic declination and zonal winds. The current study pro- vides strong supporting evidence of the longitudinal change and the plausible mechanism by examining the climatology of electron density Ne on both east and west sides of the radar with a longitude separation of up to 40% for different heights within 300-450 kin. Main findings include： 1） The east-west difference can be up to 60% and varies over the course of the day, being positive （East side Ne 〉 West side Ne） in the late evening, and negative （West side Ne 〉 East side Ne） in the pre-noon. 2） The east-west difference exists throughout the year. The positive （relative） difference is most pronounced in winter; the negative （relative） difference is most pronounced in early spring and later summer. 3） The east-west difference tends to enhance toward decreasing solar activity, however, with some seasonal dependence; the enhancements in the positive and negative differences do not take place simultaneously. 4） Both times of largest positive and largest negative east-west differences in Ne are earlier in summer and later in winter. The two times differ by 12-13 h, which remains constant throughout the year. 5） Variations at different heights from 300-450 km are similar. Zonal wind climatology above Millstone Hill is found to be perfectly consistent with what is expected based on the electron density difference between the east and west sides of the site. The magnetic declination-zonal wind mechanism is true for other longitude sectors as well, and may be used to understand longitudinal variations elsewhere. It may also be used to derive thermospheric zonal winds.

关键词： midlatitude ionosphere geomagnetic declination thermospheric zonal winds longitudinal variation incoherent scatterradar

Noninvasive ventilation for pediatric interfacility transports:a retrospective study

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World Journal of Pediatrics 2020年第4期16卷 422-425页

作者： Samantha Holbird Tanya holt Adam Shaw gregory Hansen College of Medicine University of SaskatchewanSaskatoonSKCanada Division of Pediatric Critical Care Jim Pattison Children’s Hospital103 Hospital DriveSaskatoonSKS7N 0W8Canada

Background To characterize pediatric patients supported with continuous positive airway pressure and bilevel positive airway pressure(CPAP/BiPAP)or high-flow nasal cannula(HFNC)during interfacility transport(IFT).Methods A retrospective study with a provincial pediatric transport team from a tertiary hospital pediatric intensive care *** patients aged 28 days togh a transport registry and were included in the *** A total of 118(26.7%)patients received CPAP/BIPAP or HFNC support for *** most common respiratory diagnosis was bronchiolitis(46%).These patients were placed on respiratory support,31.4 minutes after the transport team’s *** required intubation during their IFT,despite mean transport times of 163 *** This study may provide important information for programs with large catchment areas,in which large distances and transport times should not be barriers to NIV implementation.

关键词： Children Critical illness Intubation Noninvasive ventilation Transportation of patients

Data-driven approaches for cyber defense of battery energy storage systems

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能源与人工智能(英文) 2021年第3期5卷 379-387页

作者： Nina Kharlamova Seyedmostafa Hashemi Chresten Træholt Technical University of Denmark CopenhagenDenmark

Battery energy storage system(BESS)is an important component of a modern power system since it allows seamless integration of renewable energy sources(RES)into the grid.A BESS is vulnerable to various cyber threats that may influence its proper operation,which in turn impacts negatively the BESS and the electric *** potential failure of a BESS can cause economic issues and physical damage to its *** ensure cyber-secure and reliable BESS operation in grid-connected or islanded modes of the BESS operation,a cyber-defense strategy is ***,a comprehensive review on the requirements for the BESS design as well as the attack detection and mitigation methods is *** this paper,we review state-of-the-art attack detection and mitigation methods for various BESS applications focusing on machine learning(ML)and artificial intelligence(AI)-based *** addition,the state-of-the-art methods for designing and operating a cyber-secure BESS are *** on the literature review,we identified gaps in the current research,defined the possible cyberattacks against the BESS that have not been considered before,and suggested the potential approaches to detect them.

关键词： Cyber security Artificial intelligence Battery energy storage system False data injection attack Cyberattack Machine learning

Importance of sperm morphology during sperm transport and fertilization in mammals

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Asian Journal of Andrology 2016年第6期18卷 844-850页

作者： Francisco A garcia-Vazquez Joaquin gadea Carmen Matas William V holt Department of Physiology Faculty of Veterinary Science International Excellence Campus for Higher Education and Research 'Campus Mare Nostrum' University of Murcia Murcia 30100 Spain Institute for Biomedical Research of Murcia (IMIB-Arrixaca) Murcia Spain Department of Human Metabolism Academic Unit of Reproductive and Developmental Medicine Sheffield S10 2SF UK

After natural or artificial insemination, the spermatozoon starts a journey from the site of deposition to the place of fertilization. However, only a small subset of the spermatozoa deposited achieves their goal： to reach and fertilize the egg. Factors involved in controlling sperm transport and fertilization include the female reproductive tract environment, cell-cell interactions, gene expression, and phenotypic sperm traits. Some of the significant determinants of fertilization are known （i.e., motility or DNA status）, but many sperm traits are still indecipherable. One example is the influence of sperm dimensions and shape upon transport within the female genital tract towards the oocyte. Biophysical associations between sperm size and motility may influence the progression of spermatozoa through the female reproductive tract, but uncertainties remain concerning how sperm morphology influences the fertilization process, and whether only the sperm dimensions per se are involved. Moreover, such explanations do not allow the possibility that the female tract is capable of distinguishing fertile spermatozoa on the basis of their morphology, as seems to be the case with biochemical, molecular, and genetic properties. This review focuses on the influence of sperm size and shape in evolution and their putative role in sperm transport and selection within the uterus and the ability to fertilize the oocyte.

关键词： CASA-Morph female reproductive tract flagellum morphometry sperm competition sperm head sperm selectionsperm size

Immersion in the Design: Design-for-assembly of Cable Harnesses

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厦门大学学报（自然科学版） 2002年第S1期41卷 205-206页

作者： J E L Simmons J M Ritchie P O'B holt g T Russell Manufacturing Systems Research group Manufacturing Systems Research Group Image Systems Engineering LaboratoryHeriot-Watt UniversityImage Systems Engineering LaboratoryHeriot-Watt University Edinburgh UKEdinburgh UK

Approaches to efficiency in manufacturing and assem bl y over the past 100 years have concentrated frequently on the twin themes of div iding jobs done by people into defined segments and to automating as many of tho se segments as possible. This approach to manufacturing engineering may be char acterised as one of deconstruction and replacement so far as the role of the hum an being is concerned. More recently design engineering has been approached in a similar light with research into ’intelligent’ methods involving, for example, expert systems or genetic algorithms to handle an increasing proportion of desi gn tasks. Expert systems are predicated on the idea that it is possible to capture and systemise significant amounts of professional knowledge: a task that has proved with experience to be much more difficult than when such systems wer e first proposed. genetic algorithms, notwithstanding considerable research eff ort, have yet to make significant inroads into the practise of design and manufa cture. This paper will draw on new and previous experimental work carried out with supp ort from industry to propose an alternative approach that is enabled by the prod ucts of modern information technology. In this paradigm it is recognised that t he involvement of the human design expert is, for the time being at least, inevi table. Rather than seeking to reduce or even eliminate the " expert" with his or her tacit knowledge, the aim is to provide the expert with interactive to ols including immersive virtual reality so that implicit, human expertise can be applied effectively in the design cycle. The proposed approach is considered in the context of a particularly costly and difficult task, namely the design and planning for manufacture and assembly of c able harnesses for use in electro-mechanical artefacts. The efficient and reli able manufacture of cabling systems for many such products in the aerospace, aut omotive and IT sectors provides diverse challenges to des

关键词： Immersion in the Design