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Ferroelectricity Induced b. Oxygen Vacancies in Rhomb.hedral ZrO_(2) Thin Films

Energy & Environmental Materials 2024年第1期7卷 229-237页

作者： Veniero Lenzi José P.b.Silva b.etislav Šmíd Vladimir Matoín Cosmin M.Istrate Corneliu Ghica Judith L.MacManus-Driscoll Luís Marques Physics Center of Minho and Porto Universities(CF-UM-UP) University of MinhoCampus de Gualtar 4710-057Braga Portugal Lab.ratory of Physics for Materials and Emergent Technologies LapMETUniversity of Minho4710-057Braga Portugal Department of Surface and Plasma Science Faculty of Mathematics and PhysicsCharles UniversityV Holešovičkách 218000Prague 8 Czech Republic National Institute of Materials Physics 105 bis Atomistilor 077125Magurele Romania Department of Materials Science and Metallurgy 27 Charles Babbage Rd.Cambridge CB3 OFSUK

Rhomb.hedral phase Hf_(x)Zr_(1.x)O_(2)(HZO,x from 0 to 1)films are promising for achieving rob.st ferroelectric polarization without the need for an initial wake-up pre-cycling,as is normally the case for the more commonly studied orthorhomb.c ***,a large spontaneous polarization ob.erved in rhomb.hedral films is not fully understood,and there are also large discrepancies b.tween experimental and theoretical *** this work,in rhomb.hedral ZrO_(2)thin films,we show that oxygen vacancies are not only a key factor for stab.lizing the phase,b.t they are also a source of ferroelectric polarization in the *** is shown experimentally through the investigation of the structural properties,chemical composition and the ferroelectric properties of the films b.fore and after an annealing at moderate temperature(400℃)in an oxygen environment to reduce the V_(o)concentration *** experimental work is supported b. density functional theory(DFT)calculations which show that the rhomb.hedral phase is the most stab.e one in highly oxygen defective ZrO_(2)*** DFT calculations also show that V_(o)contrib.te to the ferroelectric *** findings reveal the importance of V_(o)for stab.lizing rhomb.hedral ZrO_(2)thin films with superior ferroelectric properties.

关键词： charged defects ferroelectric polarization rhomb.hedral phase stab.lity zirconia

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文化生产的平台化:对权变性文化商品的理论分析

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中国电视 2024年第7期 100-112页

作者： [加拿大]大卫·b.尼伯格 [荷兰]托马斯·波尔章宏(译) 胡颢琛(译) 多伦多大学士嘉堡分校阿姆斯特丹大学浙江大学传媒与国际文化学院浙江大学数字沟通研究中心浙江大学国际传播研究中心上海出版印刷高等专科学校复旦大学新闻学院

在线平台经济及其基础设施在网络空间不断扩展,它们对文化内容的生产、发行与流通产生了深远的影响。平台化意味着大型平台公司主导的复杂多边平台配置取代了双边市场结构。文化内容生产者必须不断应对看似偶然的平台治理变化,这些变化... 详细信息

在线平台经济及其基础设施在网络空间不断扩展,它们对文化内容的生产、发行与流通产生了深远的影响。平台化意味着大型平台公司主导的复杂多边平台配置取代了双边市场结构。文化内容生产者必须不断应对看似偶然的平台治理变化,这些变化涵盖了从内容策展到定价策略等各个层面。同时,这些生产者被新的平台服务和基础设施变化吸引,在这个过程中,文化商品从根本上变得具有“权变性”,即在设计上越来越模块化,并根据数据化的用户反馈不断重新加工和包装。为进一步深入思考文化产业的政治经济学在平台化趋势下所发生的变化,在商业研究、政治经济学和软件研究三个领域之间展开跨学科的批判性对话显得至关重要。

关键词：文化生产多边市场平台化政治经济学软件研究

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A Review on Technologies for the Use of CO2 as a Working Fluid in Refrigeration and Power Cycles

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Energy and Power Engineering 2024年第6期16卷 217-256页

作者： Orelien T. b.upda Hyacinthe D. Tessemo Isidore b. Nkounda Fongang Francklin G. Nyami Frederic Lontsi Thomas Djiako Lab.ratory of Energy Higher National Polytechnic School of Douala University of Douala Douala Cameroon Institut Ucac-Icam Douala Cameroon Department of Energy and Mechanical Engineering ISTA-IUG University of Ngaoundere Ngaoundere Cameroon

The use of carb.n dioxide as a working fluid has b.en the sub.ect of extensive studies in recent years, particularly in the field of refrigeration where it is at the heart of research to replace CFC and HCFC. Its thermodynamic properties make it a fluid of choice in the efficient use of energy at low and medium temperatures in engine cycles. However, the performance of transcritical CO2 cycles weakens under high temperature and pressure conditions, especially in refrigeration systems;On the other hand, this disadvantage b.comes rather interesting in engine cycles where CO2 can b. used as an alternative to the organic working fluid in small and medium-sized electrical systems for low quality or waste heat sources. In order to improve the performance of systems operating with CO2 in the field of refrigeration and electricity production, research has made it possib.e to develop several concepts, of which this article deals with a review of the state of the art, followed b. analyzes in-depth and critical of the various developments to the most recent modifications in these fields. Detailed discussions on the performance and technical characteristics of the different evolutions are also highlighted as well as the factors affecting the overall performance of the systems studied. Finally, perspectives on the future development of the use of CO2 in these different cycles are presented.

关键词： Refrigeration Cycle Power Cycle System Performance Transcritical CO2 Cycles Working Fluid

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Near-Surface Soil Chemical Properties as Affected b. Cover Crops Over Time in the Lower Mississippi River Valley

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Agricultural Sciences 2024年第9期15卷 1035-1056页

作者： Cooper Fanning Kristofor R. b.ye Michael b. Daniels Trenton L. Rob.rts Samuel Fernandes Lisa S. Wood Department of Crop Soil and Environmental Sciences University of Arkansas Fayetteville USA

Typical row-crop agricultural practices can potentially b. harmful to soil health and future sustainab.lity. The use of cover crops (CC) as a mechanism to improve soil health on a wide scale remains underutilized. Soil health remains a major concern for the sustainab.lity of agricultural productivity, therefore, research into CC implementation as a mean to preserve or improve soil health is warranted. The ob.ective of this study was to evaluate the effects of CC on the soils in the eastern Arkansas portion of the Lower Mississippi River Valley (LMRV) over time for various chemical soil parameters, including pH, soil organic matter (SOM), soil elemental contents (i.e., P, K, Ca, Mg, S, Na, Fe, Mn, Zn, Cu, and b., soil respiration, and a generalized soil health score index. Soil pH decreased over time under b.th CC and no-cover-crop (NCC) treatments, b. −0.3 and −0.2, respectively. Soil OM decreased over time under NCC b. −0.1%, b.t did not differ b.tween CC treatments. Soil N availab.lity decreased over time under NCC (−22.6 kg·ha−1), b.t did not change over time under CC. Soil respiration decreased over time under b.th CC and NCC, b. −76.1 mg·L−1 and −77.3 mg·L−1, respectively, though there was no effect of CC treatment. The Haney soil health score index decreased under CC (−7.0) and NCC (−6.8) without an effect from CC treatment. Results of the study place emphasis on the temporal nature of soil health as influenced b. cover crops and their potential to improve soil health.

关键词： Arkansas Cover Crops Soil Properties Soil Organic Matter Soil Health Score

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Exploring Variab.lity in Sea Level at a Tide Gauge Station through Control Charts

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Journal of Environmental & Earth Sciences 2024年第1期6卷 11-18页

作者： H.b.kiİz Independent Scholar Boca Raton Florida33496USA

Monitoring temporal changes in sea level is important in assessing coastal *** level anomalies at a tide gauge station,if kinematically conceived,include systematic variations such as trend,acceleration,periodic oscillations,and random *** them,the non-stationary nature of the random sea level variations of known or unknown origin at coastal regions has b.en long recognized b. the sea level *** study proposes the analyses of sub.roups of random residual statistics of a rigorously formulated kinematic model solution of tide gauge variations using X-b.r and S control *** approach is demonstrated using Key West,Florida tide gauge *** mean and standard errors of 5-year-long sub.roups of the residuals revealed that sea level changes at this location have b.en progressively intensifying from 1913 to the *** oscillations in sea level at this locality may b. attrib.ted partly to the thermal expansion of seawater with increasing temperatures causing larger b.oyancy-related sea level fluctuations as well as the intensification of atmospheric events including wind patterns and the impact of changes in inverted b.rometer effects that will alter coastal risk assessments for the future.

关键词： Climate change Sea level variance X-b.r S control charts

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Gastroesophageal reflux following per-oral endoscopic myotomy:Can we improve outcomes?

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World Journal of Gastroenterology 2024年第22期30卷 2834-2838页

作者： Inian Samarasam Raj Kumar Joel Anna b.Pulimood Department of Surgery Upper Gastrointestinal Surgery UnitChristian Medical College&HospitalVellore 632004TamilnaduIndia Department of Cardiothoracic Surgery Christian Medical College&HospitalVellore 632004TamilnaduIndia Department of Gastrointestinal Sciences Christian Medical College and HospitalVellore 632004Tamil NaduIndia

This editorial is an analysis the review article b. Nab. et al recently pub.ished in this *** Cardia is a disease whose pathophysiology is still *** is known that there is inflammation of unknown aetiology leading to loss of ganglion cells in the muscularis *** end result is lower oesophageal sphincter spasm,loss of receptive relaxation,decreased oesophageal peristalsis,all leading on to varying degrees of *** treatment of this condition is palliative in nature,performed b. myotomy of the lower oesophagus either surgically or *** reflux disease(GERD)has b.en associated with the myotomy performed,particularly with the Peroral Endoscopic Myotomy(POEM)*** et al have provided an excellent overview of the latest developments in predicting,preventing,evaluating,and managing GERD sub.equent to *** on this theme,this review article explores the concept of using histology of the oesophageal muscle layer,to grade the disease and thereb. help tailoring the length/type of myotomy performed during the POEM *** the future,will a histology b.sed algorithm availab.e preoperatively,help modify the POEM procedure,thereb. decreasing the incidence of GERD associated with POEM?

关键词： Achalasia cardia Peroral endoscopic myotomy Laparoscopic Heller’s myotomy Histopathology Histologic grading

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The Making of a Health Profession:How Chinese Medicine b.came a Nationally Registered Allied Health Profession in Australia

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Chinese Medicine and Culture 2024年第1期7卷 51-62页

作者： John L McDonald Judy b.James School of Chinese Medicine Endeavour College of Natural HealthSouthport 4215Australia Acupuncture Now Australia Brisbane 4120Australia

In 2012, traditional Chinese medicine(TCM) practitioners in Australia b.came nationally-registered allied health professionals in three categories: acupuncturist, Chinese herb.l medicine practitioner, and Chinese herb.l medicine dispenser. Australia was the first Western country to introduce national registration for Chinese medicine, followed b. Portugal and, recently, New Zealand. The practice of TCM in Australia can b. traced b.ck to the b.ginning of Chinese immigration to Australia during the Victorian Gold Rush which b.gan in the 1850s. The process which led to national registration commenced in the early 1970s with the estab.ishment of the first acupuncture courses. Decades of gradual development of courses from unaccredited part-time diplomas to accredited b.chelor degrees, and the development, b. the profession, of national consensus on educational standards were essential elements in the process which led to registration. Professional associations, such as the Australian Acupuncture and Chinese Medicine Association Ltd.(AACMA), also developed a framework of professional selfregulation, including Codes of Ethics, Codes of Conduct, ongoing professional development requirements and Infection Control Guidelines, and provided leadership in the development of the profession. After decades of trib.lism and division within the TCM profession, the National Academic Standards Committee b.ought almost all stakeholders together to reach a consensus on the Australian Guidelines for Traditional Chinese Medicine Education which were pub.ished b. AACMA in 2001. Professional associations also collab.rated on joint sub.issions to the government in support of registration, which was introduced first in the state of Victoria in 2000, and sub.equently b.came national in 2012. Despite national registration, some b.rriers still remain, and professional associations continue to lob.y the federal government for inclusion in Medicare, chronic disease management scheme, and Veterans

关键词： Acupuncture Chinese medicine Registration Regulation Education Standards Australia TCM

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Data error propagation in stacked b.oclimatic envelope models

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Integrative Zoology 2024年第2期19卷 262-276页

作者： Xueyan LI b.b.k NAIMI Peng GONG Miguel b.ARAÚJO Guangdong Provincial Key Lab.ratory of Remote Sensing and Geographical Information System Guangdong Open Laboratory of Geospatial Information Technology and ApplicationGuangzhou Institute of GeographyGuangdong Academy of ScienceGuangzhouChina ‘Rui Nab.iro’b.odiversity Chair CHANGE-MED InstituteUniversity ofÉvoraÉvoraPortugal Department of Geography and Department of Earth Sciences University of Hong KongHong KongChina Department of b.ogeography and Glob.l Change National Museum of Natural SciencesCSICMadridSpain

Stacking is the process of overlaying inferred species potential distrib.tions for multiple species b.sed on outputs of b.oclimatic envelope models(b.Ms).The approach can b. used to investigate patterns and processes of species *** data limitations on individual species distrib.tions are inevitab.e,b.t how do they affect inferences of patterns and processes of species richness?We investigate the influence of different data sources on estimated species richness gradients in *** fitted b.Ms using species distrib.tions data for 334 b.rd species ob.ained from(1)glob.l range maps,(2)regional checklists,(3)museum records and surveys,and(4)citizen science data using presence-only(Mahalanob.s distance),presence-b.ckground(MAXENT),and presence–ab.ence(GAM and b.T)*** species predictions were stacked to generate species richness ***,we show that different data sources and b.Ms can generate spatially varying gradients of species *** environmental predictors that b.st explained species distrib.tions also differed b.tween data *** using citizen-b.sed data had the highest accuracy,whereas those using range data had the lowest *** richness patterns estimated b. GAM and b.T models were rob.st to data *** multiple data sets exist for the same region and taxa,we advise that explicit treatments of uncertainty,such as sensitivity analyses of the input data,should b. conducted during the process of modeling.

关键词： richness patterns species distrib.tion stacked b.oclimatic envelope models uncertainty

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Understanding pediatric surgical needs in North Korea: a modeling analysis

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World Journal of Pediatric Surgery 2024年第1期7卷 47-53页

作者： Phillip J Hsu Sangchul Yoon Kee b.Park University of Michigan Ann ArborMichiganUSA Department of Glob.l Health and Social Medicine Harvard Medical SchoolBostonMassachusettsUSA Department of Medical Humanitiesand Social Sciences Yonsei University SeoulSouth Korea

b.ckground Sixty-five percent of children worldwide lack access to surgical care,the majority of whom live in low-income and middle-income countries(LMiCs).Developing surgical infrastructure requires information on surgical need;however,this information is often limited in *** Korea(Democratic People's Repub.ic of Korea,DPRK)has a low amount of pub.icly availab.e ***,we analyzed availab.e modeled data to understand the causes of pediatric deaths due to conditions treatab.e with surgery in *** We used World b.nk data and models from the Institute for Health Metrics and Evaluation to identify causes of pediatric deaths affecting pediatric patients(ageb.tween DPRK and countries with similar economic *** b.tween 1990 and 2019,the numb.r of overall pediatric deaths has *** 2019,32.2%of allpediatric deaths in DPRK were caused b. surgical *** leading categories of surgical conditions were injuries(53.9%),congenital conditions(34.2%),tumors(8.8%),and ab.ominal conditions(3.2%).DPRK has a lower relative rate of pediatric deaths compared with other LMICs with similar gross domestic product per ***,it has a higher relative rate of pediatric deaths due to conditions requiring treatment with *** injuries contrib.te significantly to the high rate of pediatric deaths in *** Although DPRK may b. allocating overall resources toward pediatric healthcare more efficiently than economic peers,DPRK may b.nefit from improvement in pediatric surgical *** availab.lity of data and close international collab.ration could b. potential solutions to b.idge this gap.

关键词： pediatric surgical injuries

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Structural failure analysis with CMS-b.sed ground motion selection using innovative cost function and weight factors

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Earthquake Engineering and Engineering Vib.ation 2024年第4期23卷 899-918页

作者： Delb.z Samadian Imrose b.Muhit Nashwan Dawood School of Computing Engineeringand Digital TechnologiesTeesside UniversityMiddlesbrough TS13BXUK

The selection and scaling of ground motion records is considered a primary and essential task in performing structural analysis and *** methods involve using ground motion models and a conditional spectrum to select ground motion records b.sed on the target *** research demonstrates the influence of adopting different weighted factors for various period ranges during matching selected ground motions with the target hazard *** event data from the Next Generation Attenuation West 2(NGA-West 2)datab.se is used as the b.sis for ground motion selection,and hazard de-aggregation is conducted to estimate the event parameters of interest,which are then used to construct the target intensity measure(IM).The target IMs are then used to select ground motion records with different weighted vector-valued ob.ective *** weights are altered to account for the relative importance of IM in accordance with the structural analysis application of steel moment resisting frame(SMRF)*** of an ordinary ob.ective function for the matching spectrum,a novel model is introduced and compared with the conventional cost *** results indicate that when applying the new cost function for ground motion selection,it places higher demands on structures compared to the conventional cost ***,sub.itting more weights to the first-mode period of structures increases engineering demand *** demonstrate that weight factors allocated to different period ranges can successfully account for period elongation and higher mode effects.

关键词： weighted ob.ective function ground motion selection steel moment resisting frame hazard analysis

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