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Fluidization and Transport of Vibrated Granular Matter:A Review of Landmark and Recent contributions

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Fluid Dynamics & Materials Processing 2024年第1期20卷 1-29页

作者： Peter watson Sebastien Vincent Bonnieu Marcello Lappa Department of Mechanical and Aerospace Engineering University of StrathclydeGlasgowUK European Space Agency European Space Research and Technology CentreNoordwijkNetherland

We present a short retrospective review of the existing literature about the dynamics of(dry)granular matter under the effect of *** main objective is the development of an integrated resource where vital information about past findings and recent discoveries is provided in a single *** attention is paid to those works where successful synthetic routes to as-yet unknown phenomena were *** landmark results are analyzed,while smoothly blending them with a history of the field and introducing possible categorizations of the prevalent *** no classification is perfect,and it is hard to distillate general properties out of specific observations or realizations,two possible ways to interpret the existing results are defined according to the type of forcing or the emerging(ensuing)regime of *** particular,first results concerning the case where vibrations and gravity are concurrent(vertical shaking)are examined,then the companion situation with vibrations perpendicular to gravity(horizontal shaking)is *** classes are introduced as follows:(1)Regimes where sand self-organizes leading to highly regular geometrical“pulsating”patterns(thin layer case);(2)Regimes where the material undergoes“fluidization”and develops an internal multicellular convective state(tick layers case);(3)Regimes where the free interface separating the sand from the overlying gas changes inclination or develops a kind a patterned configuration consisting of stable valleys and mountains or travelling waves;(4)Regimes where segregation is produced,i.e.,particles of a given size tend to be separated from the other grains(deep containers).Where possible,an analogy or parallelism is drawn with respect to the companion field of fluid-dynamics for which the assumption of“continuum”can be applied.

关键词： Granular materials vibrations fluidization flowability symmetry breaking

Examining the effect of speed, roadside features, and roadway geometry on crash experience along a rural corridor

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Journal of Modern Transportation 2014年第2期22卷 84-95页

作者： Donald c. watson Jr. Ahmed Al-Kaisy Nathan D. Anderson 289 North Lake Lulu Drive Winter Haven FL 33880 USA Western Transportation Institute Montana State University 213Cobleigh Hall Bozeman MT 59717 USA

This paper presents a current investigation into crash experience along a 15.7-mile rural corridor in southwest Montana with the aim of better understanding crash causal factors along the corridor. The study utilized ten years of crash data, geometric data, and observed freeflow speed data along the corridor. A systematic approach was used where every tenth of a mile was described in term of the crash experience, speed, alignment, and roadside features. Using bivariate and multivariate statistical anal-yses, the study investigated the crash experience along the corridor as well as some of the underlying relationships which could explain some of the crash causal factors. Results show a strong association between crash rates and horizontal curvatures even for flat curves that can be negotiated at speeds above the posted speed limit, per the highway design equations. Higher crash rates were also found to be associated with the difference between the observed free-flow speeds and the speed dictated by the curve radius or sight distance as per the design equations. Further, results strongly support the safety benefits of guardrails as evidenced by the lower crash rates and severities. The presence of fixed objects and the steepness of side slopes were also found to have an effect on crash rates and severities.

关键词： crashes Rural Analysis Alignment Speed Roadside

calorimetry is not *** insights on association processes in surfactant-polymer mixtures derived from calorimetric experiments

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中国科学：化学 2012年第1期42卷 123-124页

作者： LOH watson BRINATTI cesar Institute of chemistry Universidade Estadual de Campinas(UNICAMP)

This comment will review and discuss recent results obtained with the use of calorimetry in assessing molecular information from complex phenomena such as association in surfactant/polymer *** examples were selected to support the view that it is possible to ally the great sensitivity of modern calorimeters with carefully planned experiments and,sometimes,ancillary techniques in order to derive detailed information on molecular interactions.

关键词：聚合物混合物表面活性剂量热实验颜色进程关联热法研究成果

Longitudinal assessment of liver stiffness by transient elastography for chronic hepatitis c patients

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World Journal of clinical cases 2022年第17期10卷 5566-5576页

作者： Anya Mezina Arunkumar Krishnan Tinsay A Woreta Kevin B Rubenstein Eric.watson Po-Hung chen carla Rodriguez-watson Department of Medicine Johns Hopkins School of MedicineBaltimoreMD 21287United States Division of Gastroenterology and Hepatology Johns Hopkins School of MedicineBaltimoreMD 21231United States Mid-Atlantic Permanente Research Institute Kaiser Permanente Mid-Atlantic StatesRockville 20852United States Department of Health Policy and Management Bloomberg School of Public HealthJohns Hopkins UniversityBaltimoreMD 21287United States Innovation in Medical Evidence Development and Surveillance(IMEDS)Program Reagan-Udall Foundation for the FDAWashington20036United States

BAcKGROUND Liver fibrosis is a common pathway of liver injury and is a feature of most chronic liver *** progression varies markedly in patients with hepatitis c virus(HcV).Liver stiffness has been recommended as a parameter of fibrosis progression/regression in patients with *** To investigate changes in liver stiffness measured by transient elastography(TE)in a large,racially diverse cohort of United States patients with chronic hepatitis c(cHc).METHODS We evaluated the differences in liver stiffness between patients treated with direct-acting antiviral(DAA)therapy and untreated *** had≥2 TE measurements and no prior DAA *** used linear regression to measure the change in liver stiffness between first and last TE in response to treatment,controlling for age,sex,race,diabetes,smoking status,human immunodeficiency virus status,baseline alanine aminotransferase,and baseline liver *** regression models analyzed the change in liver stiffness as measured by kPa,stratified by cirrhosis *** Of 813 patients,419(52%)initiated DAA *** liver stiffness was 12 kPa in 127(16%).Median time between first and last TE was 11.7 and 12.7 mo among treated and untreated patients,*** was no significant change in liver stiffness observed over time in either the group initiating DAA treatment(0.016 kPa/month;cI:-0.051,0.084)or in the untreated group(0.001 kPa/mo;cI:-0.090,0.092),controlling for covariates.A higher baseline kPa score was independently associated with decreased liver *** DAA treatment was not associated with a differential change in liver stiffness over time in patients with cHc compared to untreated patients.

关键词： chronic hepatitis c Liver stiffness cirrhosis Transient elastography Direct-acting antiviral therapy

creeping fat and gut microbiota in crohn’s disease

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World Journal of Gastroenterology 2025年第1期31卷 16-23页

作者： Ana EV Quaglio Daniéla O Magro Marcello Imbrizi Ellen cS De Oliveira Luiz c Di Stasi Ligia Y Sassaki Verum Ingredients Botucatu Technology ParkBotucatu 18605-525São PauloBrazil Department of Surgery Faculty of Medical SciencesState University of CampinasCampinas 13083-970São PauloBrazil Department of Gastroenterology Faculty of Medical SciencesUniversity of CampinasCampinas 13083-970São PauloBrazil Department of Internal Medicine Medical SchoolSão Paulo State UniversityBotucatu 18618-686São PauloBrazil Department of Biophysics and Pharmacology Institute of BiosciencesSão Paulo State UniversityBotucatu 18618-689São PauloBrazil

In this article,we explored the role of adipose tissue,especially mesenteric adipose tissue and creeping fat,and its association with the gut microbiota in the pathophysiology and progression of crohn’s disease(cD).cD is a form of inflammatory bowel disease characterized by chronic inflammation of the gastrointestinal tract,influenced by genetic predisposition,gut microbiota dysbiosis,and environmental *** microbiota plays a crucial role in modulating immune response and intestinal inflammation and is associated with the onset and progression of ***,visceral adipose tissue,particularly creeping fat,a mesenteric adipose tissue characterized by hypertrophy and fibrosis,has been implicated in cD pathogenesis,inflammation,and *** bacteria from the gut microbiota may translocate into mesenteric adipose tissue,contributing to the formation of creeping fat and influencing cD *** creeping fat may be a protective barrier against bacterial invasion,its expansion can damage adjacent tissues,leading to *** gut microbiota through interventions such as fecal microbiota transplantation,probiotics,and prebiotics has shown potential in managing ***,more research is needed to clarify the mechanisms linking gut dysbiosis,creeping fat,and cD progression and develop targeted therapies for microbiota modulation and fat-related complications in patients with cD.

关键词： creeping fat Mesenteric adipose tissue Gut microbiota crohn’s disease Inflammatory bowel disease

The moderating effect of physical activity on the relationship between bullying and mental health among sexual and gender minority youth

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Journal of Sport and Health Science 2023年第1期12卷 106-115页

作者： Sally J.Kirklewski Ryan J.watson carolyn Lauckner Department of Health Promotion and Behavior University of GeorgiaAthensGA 30602USA Human Development and Family Sciences University of ConnecticutStorrsCT 06269 USA Department of Behavioral Science University of Kentucky College of MedicineUniversity of KentuckyLexingtonKY 40506USA

Background:Sexual and gender minority youth frequently experience bullying,which often contributes to higher depressive symptoms and lower *** that physical activity(PA)can mitigate depressive symptoms and improve self-esteem,we examined the moderating effect of PA on the relationship between bullying and mental health among sexual and gender minority ***:Data from the Lesbian,Gay,Bisexual,Transgender,and Queer National Teen Survey(n=9890)were *** regression analyses examined the influence of history and frequency of being bullied,PA,and the interaction of these variables on depressive symptoms and *** slopes analyses were used to probe significant ***:Results indicated the importance of accounting for bullying history when examining effects of PA on mental *** was negatively related to depression(t=-4.18,pcy was positively related to depression(t=19.35,pcant interaction between bullying frequency and PA for depression(t=4.45,pc analyses suggested that the positive effects of PA on mental health may be limited to those not bullied because it had a negligible effect on those who were ***:Results suggest that sexual and gender minority youth exercise interventions aiming to improve mental health should first address bullying history;otherwise,their effectiveness may be limited to those who have been bullied.

关键词： Bullying Depression Exercise LGBTQ Self-esteem Youth

Ultra‑Transparent and Multifunctional IZVO Mesh Electrodes for Next‑Generation Flexible Optoelectronics

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Nano-Micro Letters 2025年第1期17卷 293-309页

作者： Kiran A.Nirmal Tukaram D.Dongale Atul c.Khot chenjie Yao Nahyun Kim Tae Geun Kim School of Electrical Engineering Korea UniversityAnam‑ro 145Seongbuk‑guSeoulRepublic of Korea computational Electronics and Nanoscience Research Laboratory School of Nanoscience and BiotechnologyShivaji UniversityKolhapur 416004India

Mechanically durable transparent electrodes are essential for achieving long-term stability in flexible optoelectronic ***,they are crucial for applications in the fields of energy,display,healthcare,and soft *** meshes represent a promising alternative to traditional,brittle,metal oxide conductors due to their high electrical conductivity,optical transparency,and enhanced mechanical *** this paper,we present a simple method for fabricating an ultra-transparent conducting metal oxide mesh electrode using selfcracking-assisted *** this method,we produced an electrode with ultra-transparency(97.39%),high conductance(Rs=21.24Ωsq^(−1)),elevated work function(5.16 eV),and good mechanical *** also evaluated the effectiveness of the fabricated electrodes by integrating them into organic photovoltaics,organic light-emitting diodes,and flexible transparent memristor devices for neuromorphic computing,resulting in exceptional device *** addition,the unique porous structure of the vanadium-doped indium zinc oxide mesh electrodes provided excellent flexibility,rendering them a promising option for application in flexible optoelectronics.

关键词： Self-cracking template Vanadium-doped indium zinc oxide mesh Organic solar cells Organic light-emitting diodes Flexible transparent memory

miR-200 family expression is downregulated upon neoplastic progression of Barrett's esophagus

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World Journal of Gastroenterology 2011年第8期17卷 1036-1044页

作者： cameron M Smith David I watson Mary P Leong George c Mayne Michael Z Michael Bas PL Wijnhoven Damian J Hussey Department of Surgery Flinders University Bedford Park Department of Gastroenterology and Hepatology Flinders University Bedford Park Department of Surgery Erasmus Medical Centre

AIM: To investigate miR-200 family expression in Barrett's epithelium, gastric and duodenal epithelia, and esophageal adenocarcinoma. METHODS: Real-time reverse transcriptase-polymerase chain reaction was used to measure miR-200, ZEB1 and ZEB2 expression. Ingenuity Pathway Analysis of miR-200 targets was used to predict biological outcomes. RESULTS: Barrett's epithelium expressed lower levels of miR-141 and miR-200c than did gastric and duodenal epithelia (P co analysis indicated roles for the miR-200 family in molecular pathways that distinguish Barrett's epithelium from gastric and duodenalepithelia, and which control apoptosis and proliferation. All miR-200 members were downregulated in adenocarcinoma (P c expression was also downregulated in non-invasive epithelium adjacent to adenocarcinoma (P c cell lines than in a cell line derived from benign Barrett's epithelium. We observed signif icant inverse correlations between miR-200 family expression and ZEB1 and ZEB2 expression in Barrett's epithelium and esophageal adenocarcinoma (P cONcLUSION: miR-200 expression might contribute to the anti-apoptotic and proliferative phenotype of Barrett's epithelium and regulate key neoplastic processes in this epithelium.

关键词： miRNA Barrett’s esophagus Esophageal adenocarcinoma miR-200 Epithelial to mesenchymal transition Apoptosis Proliferation Epithelium

PM_(2.5) and PM_(10-2.5) chemical composition and source apportionment near a Hong Kong roadway

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Particuology 2015年第1期13卷 96-104页

作者： Yan cheng Shuncheng Lee Zhaolin Gu Kinfai Ho Yunwei Zhang Yu Huang Judith c.chow John G.watson Junji cao Renjian Zhang Department of Environmental Science and Technology School of Human Settlements and Civil EngineeringXi'an Jiaotong University State Key Laboratory of Loess Quaternary Geology Institute of Earth and EnvironmentChinese Academy of Sciences Department of civil and Structural Engineering Research Center for Environmental Technology and ManagementThe Hong Kong Polytechnic University School of Public Health and Primary care The Chinese University of Hong Kong Division of Atmospheric Sciences Desert Research Institute Key Laboratory of Regional climate-Environment Research for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of Sciences

Twenty-four-hour PM2.5 and PM10 samples were collected simultaneously at a highly trafficked road-side site in Hong Kong every sixth day from October 2004 to September 2005. The mass concentrations of PM2.5, PMlo-2.5 （defined as PM10 - PM2.5）, organic carbon （Oc）, elemental carbon （Ec）, water-soluble ions, and up to 25 elements were determined. Investigation of the chemical compositions and potential sources revealed distinct differences between PM2.5 and PM10-2.5. The annual average mass concentrations were 55.5 ＋ 25.5 and 25.9±15.7μg/m^3 for PM2.5 and PM10-2.5, respectively. Ec, OM （OM = Oc × 1.4）, and ammonium sulfate comprised over -82% of PM2.5, accounting for -29%, -27%, and -25%, respectively, of the PM2.5 mass. Low Oc/Ec ratios （less than 1） for PM2.5 suggested that fresh diesel-engine exhaust was a major contributor. Seven sources were resolved for PM2.5 by positive matrix factorization （PMF） model, including vehicle emissions （-29%）, secondary inorganic aerosols （-27%）, waste incinera- tor/biomass burning （-23%）, residual oil combustion （-10%）, marine aerosols （-6%）, industrial exhaust （-4%）, and resuspended road dust （-1%）. Ec and OM comprised only -19% of PM10-2.5. The average Oc/Ec ratio of PM10-2.5 was 7.8± 14.2, suggesting that sources other than vehicular exhaust were important contributors. The sources for PM10-2.5 determined by the PMF model included -20% traffic-generated resuspension （e.g., tire dust/brake linear/petrol evaporation）, -17% locally resuspended road dust, -17% marine aerosols, -12% secondary aerosols/field burning, and -11% vehicle emissions.

关键词： PM2.5 PM10-2.5 Roadside chemical composition Source apportionment Hong Kong