scholarly journals Research of multisensor characteristics based on optical fiber

Doklady BGUIR ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 70-78
Author(s):  
A. O. Zenevich ◽  
S. V. Zhdanovich ◽  
H. V. Vasilevski ◽  
A. A. Lagutik ◽  
T. G. Kovalenko ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Minimum Distance ◽  
Optical Radiation ◽  
Radiation Power ◽  
Optical Loss ◽  
Single Mode ◽  
Optical Reflectometry ◽  
Optimal Values ◽  
The Impact ◽  
To Receive

The research results of multisensors based on optical fiber, the principle of which is to change the conditions of propagation of optical radiation in the optical fiber in the places where macro-bends are formed at the points of impact, are presented in the paper. The formation of macro-bends leads to an additional attenuation of the power of optical radiation propagating through the optical fiber. A single-mode optical fiber was used with the parameters, which are supported by numerous manufacturers and comply with the recommendations of ITU-T G.655. The measurements were carried out for four wavelengths of optical radiation (1310, 1490, 1550, 1625 nm), corresponding to the transparency windows of the optical loss spectrum of the optical fiber. Using optical reflectometry methods, it was determined that the amount of attenuation of optical radiation of each macro-bend formed at the point of action of the multisensor does not depend on the number of simultaneously formed macro-bends and also does not depend on the location of the point of action along the length of the multisensor. The dependences of the attenuation of the optical radiation power introduced by the macro-bends of the optical fiber on the radius, length, or angle of the macro-bends formed at the multisensory impact points are determined experimentally. The obtained dependences also allow one to determine the optimal parameters of the formed macro-bends of the multisensor to obtain the maximum range of attenuation change for each value of the wavelength. The values of the minimum distance between the impact points, the maximum number of impact points and the optimal values of the radius and angle of the optical fiber macro-bend at the impact points are determined. The results obtained provide opportunities to continue the development of multisensors that allow us to receive information about parameters from several impact points, that are located on a single optical fiber, simultaneously.

High-Sensitivity Sensor Using Frequency Sweeping Generated Ringing Effect in Single-Mode Fiber-Loops

2013 ◽  
Vol 284-287 ◽  
pp. 2766-2770
Author(s):  
Yun Dong Zhang ◽  
Ying Wang ◽  
Yu Long Gai ◽  
Xue Nan Zhang ◽  
Ping Yuan
Keyword(s):  
Optical Fiber ◽  
Environmental Changes ◽  
Optical Loss ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Frequency Domain Method ◽  
Simple Method ◽  
Ringing Effect ◽  
Frequency Sweeping

In this article, we present propose a simple method to detect the minor fluid-environmental changes using ringing phenomenon generated by frequency sweeping in a single mode optical fiber resonator. The method is based on the fact that the insertion loss of the optical fiber resonator is determined by the environmental changes alone, which leads to the changes of cavity ringdown time of the fiber resonator. The method has several conspicuous advantages over the frequency-domain method, using which the minimal detectable optical loss is in the order of .We also show that the sensing system is insensitive to the temperature drifting, which overcome the main defect of fiber loop resonator, that it is extremely sensitive to temperature changes. The structure of the sensor is compact and stable due to the characteristic of optical fiber resonator, and it is easy to apply because the structure is not delicate and is easy to construct.

scholarly journals Testing of a Polarimetric Current Sensor in the Frequency Domain

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3008
Author(s):  
Sławomir Andrzej Torbus ◽  
Jacek Andrzej Michalski
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Measurement Errors ◽  
Scientific Research ◽  
Single Mode ◽  
Market Potential ◽  
Current Sensor ◽  
Industrial Property ◽  
Measuring Coil ◽  
The Impact

This paper proposes an original model of a polarimetric current sensor, in which the measuring coil was made of a single mode telecommunication optical fiber ITU-T G.652, G.653, G.655, and G.657. This sensor was subjected to the commercialization process, which was carried out by a company combining the functionality of a technology transfer center with the capabilities of the Startit Fund Sp. z o.o. The published results included the analysis of the implementation readiness, the analysis of the market potential, the valuation of the industrial property rights of the invention and indicated further directions of scientific research on the sensor, which include the frequency analysis of measurement signals. This prompted the conduct of relevant scientific research. In this paper, the idea of measurement of current using polarimetric current sensor with optical fiber coil has been briefly characterized. It shows the definition and basic properties of the Discrete Fourier Transform (DFT). It discusses the technique of determining the value of each harmonic of signal at the input and output of polarimetric current sensor. The value of measurement errors and total harmonic distortion (THD) have been calculated. The general conclusions for disturbances in the processing realized in polarimetric current sensor have been formulated. In addition, the impact of the molar concentration of the dopant GeO2 in the core of the single mode telecommunication optical fibers and the impact of the number of turns of the measuring coil on the distortion accompanying the process of processing have been determined. Therefore, it can be concluded that the key result obtained during the research is the confirmation of the fact that single mode telecommunication optical fibers can be used to build the measuring coil of a polarimetric sensor used for measuring alternating currents. This means that the considered sensor, when measuring this type of currents, does not introduce additional distortions and distortions of their waveforms.

Limitation of optical radiation power by organic molecules: II. Porphyrins and phthalocyanines

2004 ◽  
Vol 34 (2) ◽  
pp. 139-146 ◽  
Author(s):  
Rimma T Kuznetsova ◽  
T N Kopylova ◽  
G V Mayer ◽  
L G Samsonova ◽  
Valerii A Svetlichnyi ◽  
...  
Keyword(s):  
Optical Radiation ◽  
Organic Molecules ◽  
Radiation Power

58 Use of Abdominal Wall or Sucutaneous Drain to Reduce the Risk of Surgical Site Infections

2021 ◽  
Vol 108 (Supplement_2) ◽  
Author(s):  
H Mistry ◽  
B Woolner ◽  
A John
Keyword(s):  
Surgical Site Infection ◽  
Open Cholecystectomy ◽  
Surgical Site Infections ◽  
Standard Operating Procedure ◽  
Site Infection ◽  
Infection Rates ◽  
Local Evidence ◽  
Audit Data ◽  
The Impact ◽  
To Receive

Abstract Introduction Open abdominal surgery confers potentially greater risk of surgical site infections, and local evidence suggests use of drains can reduce this. Our objectives were: Assessing local rates and risk factors of infections and if use of drains can reduce the rates of infections. Method Retrospectively looking from 01/01/2018 to 31/12/2018, at patients following laparotomy or open cholecystectomy. Data collection on demographics, smoking/alcohol status, heart, respiratory or renal disease or diabetes, steroid use and CEPOD status, as well as use of drain and the outcome of infection using inpatient and online patient records. Results 84 patients included, 25 had drains inserted. There were 13 documented cases of surgical site infection, all of whom had no drain post-op. Other parameters shown to be most prevalent in the patients with a surgical site infection include being current/ex-smoker (8/13), having heart disease (9/13), and elective procedures. Conclusions Aiming to reduce the risk of surgical site infections can improve morbidity and potentially mortality outcomes. Our audit data showed that there appears to be a benefit of inserting intra-abdominal or subcutaneous drains. We will create a standard operating procedure of all patient to receive drains post-op and then re-audit to assess the impact this has on infection rates.

scholarly journals Ethnicity and outcomes in patients hospitalised with COVID-19 infection in East London: an observational cohort study

BMJ Open ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. e042140
Author(s):  
Vanessa J Apea ◽  
Yize I Wan ◽  
Rageshri Dhairyawan ◽  
Zudin A Puthucheary ◽  
Rupert M Pearse ◽  
...  
Keyword(s):  
Premature Death ◽  
Hospital Length ◽  
Hospital Length Of Stay ◽  
Organ Support ◽  
Invasive Ventilation ◽  
Black Patients ◽  
Hospitalised Patients ◽  
Observational Cohort ◽  
The Impact ◽  
To Receive

ObjectiveTo describe outcomes within different ethnic groups of a cohort of hospitalised patients with confirmed COVID-19 infection. To quantify and describe the impact of a number of prognostic factors, including frailty and inflammatory markers.SettingFive acute National Health Service Hospitals in east London.DesignProspectively defined observational study using registry data.Participants1737 patients aged 16 years or over admitted to hospital with confirmed COVID-19 infection between 1 January and 13 May 2020.Main outcome measuresThe primary outcome was 30-day mortality from time of first hospital admission with COVID-19 diagnosis during or prior to admission. Secondary outcomes were 90-day mortality, intensive care unit (ICU) admission, ICU and hospital length of stay and type and duration of organ support. Multivariable survival analyses were adjusted for potential confounders.Results1737 were included in our analysis of whom 511 had died by day 30 (29%). 538 (31%) were from Asian, 340 (20%) black and 707 (40%) white backgrounds. Compared with white patients, those from minority ethnic backgrounds were younger, with differing comorbidity profiles and less frailty. Asian and black patients were more likely to be admitted to ICU and to receive invasive ventilation (OR 1.54, (95% CI 1.06 to 2.23); p=0.023 and OR 1.80 (95% CI 1.20 to 2.71); p=0.005, respectively). After adjustment for age and sex, patients from Asian (HR 1.49 (95% CI 1.19 to 1.86); p<0.001) and black (HR 1.30 (95% CI 1.02 to 1.65); p=0.036) backgrounds were more likely to die. These findings persisted across a range of risk factor-adjusted analyses accounting for major comorbidities, obesity, smoking, frailty and ABO blood group.ConclusionsPatients from Asian and black backgrounds had higher mortality from COVID-19 infection despite controlling for all previously identified confounders and frailty. Higher rates of invasive ventilation indicate greater acute disease severity. Our analyses suggest that patients of Asian and black backgrounds suffered disproportionate rates of premature death from COVID-19.

scholarly journals Use of Anti-Cytokine Therapy in Kidney Transplant Recipients with COVID-19

2021 ◽  
Vol 10 (8) ◽  
pp. 1551
Author(s):  
Marta Bodro ◽  
Frederic Cofan ◽  
Jose Ríos ◽  
Sabina Herrera ◽  
Laura Linares ◽  
...  
Keyword(s):  
Kidney Transplant ◽  
Ordinal Scale ◽  
Transplant Recipients ◽  
Kidney Transplant Recipients ◽  
Kidney Recipients ◽  
Secondary Infections ◽  
Statistical Effect ◽  
Randomized Control ◽  
The Impact ◽  
To Receive

In the context of the coronavirus disease 2019 (COVID-19) pandemic, we aimed to evaluate the impact of anti-cytokine therapies (AT) in kidney transplant recipients requiring hospitalization due to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. This is an observational retrospective study, which included patients from March to May 2020. An inverse probability of treatment weighting from a propensity score to receive AT was used in all statistical analyses, and we applied a bootstrap procedure in order to calculate an estimation of the 2.5th and 97.5th percentiles of odds ratio (OR). outcomes were measured using an ordinal scale determination (OSD). A total of 33 kidney recipients required hospitalization and 54% of them received at least one AT, mainly tocilizumab (42%), followed by anakinra (12%). There was no statistical effect in terms of intensive care unit (ICU) admission, respiratory secondary infections (35% vs. 7%) or mortality (16% vs. 13%) comparing patients that received AT with those who did not. Nevertheless, patients who received AT presented better outcomes during hospitalization in terms of OSD ≥5 ((OR 0.31; 2.5th, 97.5th percentiles (0.10; 0.72)). These analyses indicate, as a plausible hypothesis, that the use of AT in kidney transplant recipients presenting with COVID-19 could be beneficial, even though multicenter randomized control trials using these therapies in transplanted patients are needed.

scholarly journals PSVIII-35 Late-Breaking Abstract: Administration of an appeasing substance at castration improves performance of pre-conditioned beef crossbred steers

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 347-348
Author(s):  
Kelsey Schubach ◽  
Bruno I Cappellozza ◽  
Marcos Renato Burim ◽  
André Velasco ◽  
Fernando Sagrado ◽  
...  
Keyword(s):  
Feed Efficiency ◽  
Minimum Distance ◽  
Descriptive Analysis ◽  
Bos Indicus ◽  
Experimental Unit ◽  
Water Restriction ◽  
Improve Performance ◽  
Treatment Groups ◽  
Improved Performance ◽  
To Receive

Abstract Alternatives that alleviate stress-related responses and improve performance of the beef cattle herd are imperative and deserve further investigation. In previous trials, administration of the bovine appeasing substance (BAS) has improved performance of newly-weaned and feedlot received beef animals, as well as reduced the risk of dark, firm, and dry (DFD) cuts in carcass obtained from Bos indicus cattle. Therefore, this study was designed to evaluate the effects of BAS administration at castration on pre-conditioning performance of crossbred beef animals. On day 0, 390 crossbred Angus × Nellore animals were ranked by initial shrunk BW (255 ± 21.1 kg) and assigned to receive or not (CON) 5 mL/head of BAS (SecureCattle; Nutricorp, Araras, SP, Brazil) immediately before castration. From d 0 to 30, animals within treatments were maintained in 2 feedot pens with a minimum distance (300 m) to avoid contact between treatment groups and received a grass hay-based diet (70:30 roughage:concentrate ratio) ad libitum. On day 30, animals were individually weighed following 16 hours of feed and water restriction. Hence, a descriptive analysis was performed to evaluate pen dry matter intake (DMI) and feed efficiency (FE). Animal was considered the experimental unit and all data were analyzed using the PROC MIXED procedure of SAS (version 9.4; SAS Inst. Inc., Cary, NC). Bovine appeasing substance administration at castration improved ADG and BW change (P &lt; 0.0001) compared with CON cohorts (0.983 vs. 1.155 kg/d and 29.5 vs. 34.6 kg for ADG and BW change, respectively). Total DMI was similar among treatments when reported as kg/d (6.70 vs. 6.75 kg) or % of BW (2.48 vs. 2.48%), whereas FE was dramatically improved in BAS-administered animals (146 vs. 172 g/kg for CON and BAS, respectively). In summary, BAS administration improved performance of crossbred beef animals for 30 days post-castration.

scholarly journals Impact of COVID-19: Considerations for individuals with developmental disabilities across major life domains

2020 ◽  
pp. 1-9
Author(s):  
Kathy Sheppard-Jones ◽  
Lauren Avellone ◽  
Phillip Rumrill ◽  
Hannah Seward
Keyword(s):  
Developmental Disabilities ◽  
Educational Goals ◽  
Life Domains ◽  
Health Work ◽  
Educational Settings ◽  
Major Life ◽  
Global Crisis ◽  
The Impact ◽  
To Receive

BACKGROUND: The impact of COVID-19 and other health pandemics disproportionately affects individuals with developmental disabilities (DD) across a multitude of life domains including health, work, and education. OBJECTIVE: The purpose of this article is to review some of the factors contributing to the unique impact of pandemics on individuals with DD. Not only are individuals with DD at a heightened risk of contracting a pandemic illness but are also more likely to receive inequitable care and thus the potential to experience more fatal outcomes if contracted. Challenges in receiving equitable services in times of a global crisis are observed in business and educational settings, as well. Many individuals with DD require individualized supports to meet learning and vocational needs. If the quality and continuity of those services are disrupted, individuals with DD risk termination from jobs or slowed progress in meeting educational goals. CONCLUSION: Strategies for addressing concerns related to the impact of a pandemic on different life domains for individuals with DD are discussed.

scholarly journals Acceptability of COVID-19 Vaccines and Protective Behavior among Adults in Taiwan: Associations between Risk Perception and Willingness to Vaccinate against COVID-19

2021 ◽  
Vol 18 (11) ◽  
pp. 5579
Author(s):  
Feng-Jen Tsai ◽  
Hsiu-Wen Yang ◽  
Chia-Ping Lin ◽  
Jeffrey Zen Liu
Keyword(s):  
Risk Perception ◽  
Final Analysis ◽  
Personal Health ◽  
College Level ◽  
Protective Behavior ◽  
Protective Behaviors ◽  
Cross Sectional ◽  
Vaccine Acceptance ◽  
The Impact ◽  
To Receive

This study aims to evaluate acceptance of COVID-19 vaccines and the impact of risk perception on vaccine acceptance and personal health protective behaviors in Taiwan. A nationwide cross-sectional study was conducted from 19 to 30 October 2020; 1020 participants were included in the final analysis; chi-square and logistic regression analyses were conducted. In total, 52.7% of participants were willing to receive COVID-19 vaccines, 63.5% perceived the severity of COVID-19 in Taiwan as “not serious”, and nearly 40% were worried about COVID-19 infection. Participants with higher perceived severity of COVID-19 had significantly higher odds of refusing the vaccine (OR = 1.546), while those worried about infection had lower odds of poor health protective behaviors (OR = 0.685). Vaccine refusal reasons included “the EUA process is not strict enough” (48.7%) and “side effects” (30.3%). Those who had previously refused other vaccinations were 2.44 times more likely to refuse the COVID-19 vaccines. Participants’ age had an influence on COVID-19 vaccine acceptance. In general, the Taiwanese public’s acceptance of the vaccine was lower than that in other high-income countries. Elderly participants and those with college-level education and above who had previously refused vaccines had lower willingness to receive a COVID-19 vaccine. Risk perception was positively associated with personal health protective behaviors but negatively associated with COVID-19 vaccine acceptance.

Sign in / Sign up

Export Citation Format

Share Document