The Copernicus Surface Velocity Platform drifter with Barometer and Reference Sensor for Temperature (SVP-BRST): Genesis, design, and initial results

Abstract. To support calibration and validation of satellite Sea-Surface Temperature (SST) retrievals, over 60 High Resolution SST (HRSST) drifting buoys were deployed at sea between 2012 and 2017. Their data record is reviewed here. It is confirmed that sea-state and immersion depth play an important role in understanding the data collected by such buoys and that the SST sensors need adequate insulation. In addition, calibration verification of three recovered drifters suggests that the sensor drift is low, albeit negative at around −0.01 K/year. However, the statistical significance of these results is limited, and the calibration procedure could not be exactly reproduced, introducing additional uncertainties into this drift assessment. Based on lessons learnt from these initial buoys, a new-generation drifter was designed to serve calibration of SST retrievals by European Union's Copernicus satellites. The novel drifter includes an HRSST sensor calibrated by a metrology laboratory. The sensor includes a pressure probe to monitor immersion depth in calm water, and acquires SST data at 1 Hz over a 5-minute interval every hour. This enables the derivation of mean SST as well as several percentiles of the SST distribution. The HRSST sensor is calibrated with an uncertainty better than 0.01 K. Analysis of the data collected by two prototypes deployed in the Mediterranean Sea shows that the buoys are able to capture small-scale SST variations. These variations are found to be smaller when the sea-state is well-mixed, and when the buoys are located within eddy cores. This affects the drifter SST data representativeness, which is an aspect of importance for optimal use of these data.

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The Copernicus Surface Velocity Platform drifter with Barometer and Reference Sensor for Temperature (SVP-BRST): genesis, design, and initial results

Ocean Science ◽

10.5194/os-15-199-2019 ◽

2019 ◽

Vol 15 (1) ◽

pp. 199-214 ◽

Cited By ~ 4

Author(s):

Paul Poli ◽

Marc Lucas ◽

Anne O'Carroll ◽

Marc Le Menn ◽

Arnaud David ◽

...

Keyword(s):

Statistical Significance ◽

Calibration Procedure ◽

Immersion Depth ◽

Surface Velocity ◽

Small Scale ◽

Pressure Probe ◽

The Novel ◽

Sea State ◽

Calm Water ◽

Sensor Package

Abstract. To support calibration and validation of satellite sea surface temperature (SST) retrievals, over 60 high-resolution SST (HRSST) drifting buoys were deployed at sea between 2012 and 2017. Their data record is reviewed here. It is confirmed that sea state and immersion depth play an important role in understanding the data collected by such buoys and that the SST sensors need adequate insulation. In addition, calibration verification of three recovered drifters suggests that the sensor drift is low, albeit negative at around −0.01 K year−1. However, the statistical significance of these results is limited, and the calibration procedure could not be exactly reproduced, introducing additional uncertainties into this drift assessment. Based on lessons learnt from these initial buoys, a new sensor package for the Surface Velocity Platform with Barometer (SVP-B) was designed to serve calibration of SST retrievals by European Union's Copernicus satellites. The novel sensor package includes an HRSST sensor calibrated by a metrology laboratory. The sensor includes a pressure probe to monitor immersion depth in calm water and acquires SST data at 1 Hz over a 5 min interval every hour. This enables the derivation of mean SST as well as several percentiles of the SST distribution. The HRSST sensor is calibrated with an uncertainty better than 0.01 K. Analysis of the data collected by two prototypes deployed in the Mediterranean Sea shows that the buoys are able to capture small-scale SST variations. These variations are found to be smaller when the sea state is well mixed and when the buoys are located within eddy cores. This affects the drifter SST data representativeness, which is an aspect of importance for optimal use of these data.

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Different dose of new generation proton pump inhibitors for the treatment of Helicobacter pylori infection: A meta-analysis

International Journal of Immunopathology and Pharmacology ◽

10.1177/20587384211030397 ◽

2021 ◽

Vol 35 ◽

pp. 205873842110303

Author(s):

Wenwen Gao ◽

Xiang Zhang ◽

Yanhui Yin ◽

Shuwen Yu ◽

Lu Wang

Keyword(s):

Helicobacter Pylori ◽

Proton Pump Inhibitors ◽

Proton Pump ◽

Eradication Rate ◽

Standard Dose ◽

Statistical Significance ◽

High Dose ◽

Clarithromycin Resistance ◽

H Pylori ◽

New Generation

The evidence on whether high-dose new generation proton pump inhibitors (PPIs) including rabeprazole and esomeprazole achieve a higher eradication rate of Helicobacter pylori has not been assessed. The primary comparison was eradication and adverse events (AEs) rate of standard (esomeprazole 20 mg bid, rabeprazole 10 mg bid) versus high-dose (esomeprazole 40 mg bid, rabeprazole 20 mg bid) PPIs. Sub-analyses were performed to evaluate the eradication rate between Asians and Caucasians, clarithromycin-resistance (CAM-R) strains, and clarithromycin-sensitivity (CAM-S) strains of different dose PPIs. We conducted a literature search for randomized controlled trials comparing high-with standard-dose esomeprazole and rabeprazole for H. pylori eradication and AEs. A total of 12 trials with 2237 patients were included. The eradication rate of high-dose PPIs was not significantly superior to standard-dose PPIs regimens: 85.3% versus 84.2%, OR 1.09 (0.86–1.37), P = 0.47. The high dose induced more AEs than those of the standard dose, but didn’t reach statistical significance (OR 1.25, 95% CI: 0.99–1.56, P = 0.06). Subgroup analysis showed that the difference in eradication rate of PPIs between high- and standard-dose groups were not statistically significant both in Asians (OR 0.99, 95% CI 0.75–1.32, P = 0.97) and Caucasians (OR 1.27, 95% CI 0.84–1.92, P = 0.26). Furthermore, there were similar eradication rates in CAM-S (OR 1.2; 95% CI 0.58–2.5; P = 0.63) and CAM-R strains (OR 1.08; 95% CI 0.45–2.56; P = 0.87) between the standard-and high-dose groups. High and standard dosages of new generation of the PPIs showed similar H. pylori eradication rates and AEs as well as between Asian versus Caucasian populations, with or without clarithromycin-resistance. However, further studies are needed to confirm.

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Monitoring Lakes Surface Water Velocity with SAR: A Feasibility Study on Lake Garda, Italy

Remote Sensing ◽

10.3390/rs13122293 ◽

2021 ◽

Vol 13 (12) ◽

pp. 2293

Author(s):

Marina Amadori ◽

Virginia Zamparelli ◽

Giacomo De Carolis ◽

Gianfranco Fornaro ◽

Marco Toffolon ◽

...

Keyword(s):

Surface Water ◽

Wind Waves ◽

Test Site ◽

Water Velocity ◽

Surface Velocity ◽

Medium Size ◽

Small Scale ◽

Lake Garda ◽

Marine Applications

The SAR Doppler frequencies are directly related to the motion of the scatterers in the illuminated area and have already been used in marine applications to monitor moving water surfaces. Here we investigate the possibility of retrieving surface water velocity from SAR Doppler analysis in medium-size lakes. ENVISAT images of the test site (Lake Garda) are processed and the Doppler Centroid Anomaly technique is adopted. The resulting surface velocity maps are compared with the outputs of a hydrodynamic model specifically validated for the case study. Thermal images from MODIS Terra are used in support of the modeling results. The surface velocity retrieved from SAR is found to overestimate the numerical results and the existence of a bias is investigated. In marine applications, such bias is traditionally removed through Geophysical Model Functions (GMFs) by ascribing it to a fully developed wind waves spectrum. We found that such an assumption is not supported in our case study, due to the small-scale variations of topography and wind. The role of wind intensity and duration on the results from SAR is evaluated, and the inclusion of lake bathymetry and the SAR backscatter gradient is recommended for the future development of GMFs suitable for lake environments.

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Candybots: CANDYBOTS: A New Generation of 3D‐Printed Sugar‐Based Transient Small‐Scale Robots (Adv. Mater. 52/2020)

Advanced Materials ◽

10.1002/adma.202070388 ◽

2020 ◽

Vol 32 (52) ◽

pp. 2070388

Author(s):

Simone Gervasoni ◽

Anastasia Terzopoulou ◽

Carlos Franco ◽

Andrea Veciana ◽

Norman Pedrini ◽

...

Keyword(s):

Small Scale ◽

3D Printed ◽

New Generation

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Surface kinetic energy transfer in surface quasi-geostrophic flows

Journal of Fluid Mechanics ◽

10.1017/s0022112008001110 ◽

2008 ◽

Vol 604 ◽

pp. 165-174 ◽

Cited By ~ 68

Author(s):

XAVIER CAPET ◽

PATRICE KLEIN ◽

BACH LIEN HUA ◽

GUILLAUME LAPEYRE ◽

JAMES C. MCWILLIAMS

Keyword(s):

Kinetic Energy ◽

Surface Velocity ◽

Small Scale ◽

Surface Dynamics ◽

Spectral Flux ◽

Advection Term ◽

Wide Range ◽

Geostrophic Flows ◽

Scale Range ◽

Density Variance

The relevance of surface quasi-geostrophic dynamics (SQG) to the upper ocean and the atmospheric tropopause has been recently demonstrated in a wide range of conditions. Within this context, the properties of SQG in terms of kinetic energy (KE) transfers at the surface are revisited and further explored. Two well-known and important properties of SQG characterize the surface dynamics: (i) the identity between surface velocity and density spectra (when appropriately scaled) and (ii) the existence of a forward cascade for surface density variance. Here we show numerically and analytically that (i) and (ii) do not imply a forward cascade of surface KE (through the advection term in the KE budget). On the contrary, advection by the geostrophic flow primarily induces an inverse cascade of surface KE on a large range of scales. This spectral flux is locally compensated by a KE source that is related to surface frontogenesis. The subsequent spectral budget resembles those exhibited by more complex systems (primitive equations or Boussinesq models) and observations, which strengthens the relevance of SQG for the description of ocean/atmosphere dynamics near vertical boundaries. The main weakness of SQG however is in the small-scale range (scales smaller than 20–30 km in the ocean) where it poorly represents the forward KE cascade observed in non-QG numerical simulations.

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seNorge2 daily precipitation, an observational gridded dataset over Norway from 1957 to the present day

Earth System Science Data ◽

10.5194/essd-10-235-2018 ◽

2018 ◽

Vol 10 (1) ◽

pp. 235-249 ◽

Cited By ~ 37

Author(s):

Cristian Lussana ◽

Tuomo Saloranta ◽

Thomas Skaugen ◽

Jan Magnusson ◽

Ole Einar Tveito ◽

...

Keyword(s):

High Resolution ◽

Daily Precipitation ◽

Spatial Scales ◽

National Level ◽

Calibration Procedure ◽

Geographical Information ◽

Optimal Interpolation ◽

Small Scale ◽

Meteorological Forcing ◽

Atmospheric Sciences

Abstract. The conventional climate gridded datasets based on observations only are widely used in atmospheric sciences; our focus in this paper is on climate and hydrology. On the Norwegian mainland, seNorge2 provides high-resolution fields of daily total precipitation for applications requiring long-term datasets at regional or national level, where the challenge is to simulate small-scale processes often taking place in complex terrain. The dataset constitutes a valuable meteorological input for snow and hydrological simulations; it is updated daily and presented on a high-resolution grid (1 km of grid spacing). The climate archive goes back to 1957. The spatial interpolation scheme builds upon classical methods, such as optimal interpolation and successive-correction schemes. An original approach based on (spatial) scale-separation concepts has been implemented which uses geographical coordinates and elevation as complementary information in the interpolation. seNorge2 daily precipitation fields represent local precipitation features at spatial scales of a few kilometers, depending on the station network density. In the surroundings of a station or in dense station areas, the predictions are quite accurate even for intense precipitation. For most of the grid points, the performances are comparable to or better than a state-of-the-art pan-European dataset (E-OBS), because of the higher effective resolution of seNorge2. However, in very data-sparse areas, such as in the mountainous region of southern Norway, seNorge2 underestimates precipitation because it does not make use of enough geographical information to compensate for the lack of observations. The evaluation of seNorge2 as the meteorological forcing for the seNorge snow model and the DDD (Distance Distribution Dynamics) rainfall–runoff model shows that both models have been able to make profitable use of seNorge2, partly because of the automatic calibration procedure they incorporate for precipitation. The seNorge2 dataset 1957–2015 is available at https://doi.org/10.5281/zenodo.845733. Daily updates from 2015 onwards are available at http://thredds.met.no/thredds/catalog/metusers/senorge2/seNorge2/provisional_archive/PREC1d/gridded_dataset/catalog.html.

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Tracking of velocity variations at depth in the presence of surface velocity fluctuations

Geophysics ◽

10.1190/geo2012-0071.1 ◽

2013 ◽

Vol 78 (1) ◽

pp. U1-U8 ◽

Cited By ~ 4

Author(s):

Benoit de Cacqueray ◽

Philippe Roux ◽

Michel Campillo ◽

Stefan Catheline

Keyword(s):

Surface Waves ◽

Body Waves ◽

Surface Velocity ◽

Small Scale ◽

Beam Forming ◽

Near Surface ◽

Velocity Fluctuations ◽

Wave Separation ◽

Double Beam ◽

Velocity Variations

We tested a small-scale experiment that is dedicated to the study of the wave separation algorithm and to the velocity variations monitoring problem itself. It handles the case in which velocity variations at depth are hidden by near-surface velocity fluctuations. Using an acquisition system that combines an array of sources and an array of receivers, coupled with controlled velocity variations, we tested the ability of beam-forming techniques to track velocity variations separately for body waves and surface waves. After wave separation through double beam forming, the arrival time variations of the different waves were measured through the phase difference between the extracted wavelets. Finally, a method was tested to estimate near-surface velocity variations using surface waves or shallow reflection and compute a correction to isolate target velocity variations at depth.

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Evaluation of edna: arts and dance for older people

Working with Older People ◽

10.1108/wwop-08-2015-0016 ◽

2016 ◽

Vol 20 (1) ◽

pp. 46-56 ◽

Cited By ~ 1

Author(s):

Ann Skingley ◽

Stephanie De'Ath ◽

Luci Napleton

Keyword(s):

Quality Of Life ◽

Mixed Methods ◽

Older People ◽

Statistical Significance ◽

Small Scale ◽

Control Group ◽

Life Questionnaire ◽

Content Type ◽

Art Forms

Purpose – The purpose of this paper is to evaluate the impact on health and well-being of participation in dance and arts activities by older people living in the community. Design/methodology/approach – A small-scale, mixed methods research design comprising pretest-posttest evaluation of a three month dance and arts programme. Two groups of older people underwent physical measures and completed a self-report quality of life questionnaire. Written comments and interview data were also gathered. Findings – Physical tests (n=14) demonstrated improvements in posture, shoulder mobility and balance in both groups following the intervention, with some measures reaching statistical significance. Quality of life evaluations (n=21) also showed improvement, with the mental health subscale reaching statistical significance. Qualitative data showed that participants enjoyed the programme and felt physical, psychological and social benefits. Research limitations/implications – The research involved only a small sample of volunteers and a limited programme length which limits its generalisability. The absence of a control group means that causality cannot be inferred. Future research should extend recruitment to a wider geographical area and a longer intervention which includes a control group. Practical implications – Future arts interventions for older people should include consultation prior to, and throughout the project. Commissioners should consider supporting arts for health projects, building in additional funding for evaluative work. Originality/value – This study has added to the evidence base through combining art forms within a mixed methods framework, illustrating the interplay between the art forms, the outcomes and the potential role of social context.

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Experiments on the stability and transition of wind-driven water surfaces

Journal of Fluid Mechanics ◽

10.1017/s0022112001005638 ◽

2001 ◽

Vol 446 ◽

pp. 25-65 ◽

Cited By ~ 76

Author(s):

FABRICE VERON ◽

W. KENDALL MELVILLE

Keyword(s):

Surface Current ◽

Field Measurements ◽

Surface Flow ◽

Transition To Turbulence ◽

Surface Velocity ◽

Small Scale ◽

Gas Transfer ◽

Water Surfaces ◽

Langmuir Circulations ◽

The Stability

We present the results of laboratory and field measurements on the stability of wind-driven water surfaces. The laboratory measurements show that when exposed to an increasing wind starting from rest, surface current and wave generation is accompanied by a variety of phenomena that occur over comparable space and time scales. Of particular interest is the generation of small-scale, streamwise vortices, or Langmuir circulations, the clear influence of the circulations on the structure of the growing wave field, and the subsequent transition to turbulence of the surface flow. Following recent work by Melville, Shear & Veron (1998) and Veron & Melville (1999b), we show that the waves that are initially generated by the wind are then strongly modulated by the Langmuir circulations that follow. Direct measurements of the modulated wave variables are qualitatively consistent with geometrical optics and wave action conservation, but quantitative comparison remains elusive. Within the range of parameters of the experiments, both the surface waves and the Langmuir circulations first appear at constant Reynolds numbers of 370 ± 10 and 530 ± 20, respectively, based on the surface velocity and the depth of the laminar shear layer. The onset of the Langmuir circulations leads to a significant increase in the heat transfer across the surface. The field measurements in a boat basin display the same phenomena that are observed in the laboratory. The implications of the measurements for air–sea fluxes, especially heat and gas transfer, and sea-surface temperature, are discussed.

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THE ELABORATION OF A THERAPEUTIC COMPLEX FOR UNSTABLE STENOCARDIA WITH THE TYPE II DIABETES MELLITUS BACKGROUND WITH ACCOMPANYING HYPERVENTILATIVE SYNDROME: ANALYSIS OF CLINIC-CARDIOLOGY AND RESPIRATORY-METABOLICPARAMETERS

СИСТЕМНЫЙ АНАЛИЗ И УПРАВЛЕНИЕ В БИОМЕДИЦИНСКИХ СИСТЕМАХ ◽

10.36622/vstu.2021.20.4.006 ◽

2021 ◽

pp. 38-46

Author(s):

Никита Игоревич Воронин ◽

Дмитрий Сергеевич Кузнецов

Keyword(s):

Diabetes Mellitus ◽

Traditional Approach ◽

Statistical Significance ◽

Type Ii Diabetes Mellitus ◽

Original Research ◽

Hyperventilation Syndrome ◽

Practical Development ◽

Concomitant Condition ◽

High Level ◽

New Generation

В статье представлены данные оригинального исследования по созданию терапевтического комплекса, направленного на улучшение интенсивного лечения нозологической ассоциации «нестабильная стенокардия (в качестве основного заболевания) + сахарный диабет второго типа (в качестве фоновой патологии) + гипервентиляционный синдром (в качестве сопутствующего состояния)». Разработанный комплекс основан на контролируемом изменении вспомогательной респираторной оксигенации «в сторону уменьшения» при условии обязательного дополнения базисной фармакотерапии сбалансированной комбинацией препаратов антигипоксического действия и дезагрегантом нового поколения. Проведено сравнительное исследование двух групп тематических пациентов - с применением разработанного комплекса и с использованием «традиционного подхода». Изучены ключевые параметры клинического кардиологического и респираторно-метаболического статуса пациентов. При использовании разработанного терапевтического комплекса по сравнению с «традиционным подходом» установлено принципиальное улучшение параметров клинико-кардиологического статуса при сохранении параметров респираторно-метаболического статуса в пределах адаптивных и безопасных значений. Полученные результаты имеют высокий уровень статистической значимости. Это доказало достаточную обоснованность авторской научно-практической разработки. Представленные в статье данные отличает новизна и практическая применимость, что позволяет рекомендовать их к дальнейшему использованию в практике специалистов клиники внутренних болезней The article presents the data of the original research on the creation of a therapeutic complex aimed at improving the intensive treatment of the nosological association «unstable angina pectoris (as the main disease) + type 2 diabetes mellitus (as a background pathology) + hyperventilation syndrome (as a concomitant condition)». The developed complex is based on a controlled change in auxiliary respiratory oxygenation «downward», provided that basic pharmacotherapy must be supplemented with a balanced combination of antihypoxic drugs and a new generation of antiaggregants. A comparative study of two groups of thematic patients was carried out - using the developed complex and using the «traditional approach». The key parameters of the clinical cardiological and respiratorymetabolic status of patients were studied. When using the developed therapeutic complex in comparison with the «traditional approach», a fundamental improvement in the parameters of the clinical and cardiological status was established while maintaining the parameters of the respiratory and metabolic status within the adaptive and safe values. The results obtained have a high level of statistical significance. This proved the sufficient validity of the author's scientific and practical development. The data presented in the article are distinguished by novelty and practical applicability, which makes it possible to recommend them for further use in the practice of specialists in the clinic of internal diseases

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