Academic literature on the topic 'WI 810'
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Journal articles on the topic "WI 810":
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Campbell, Tyler A., Benjamin R. Laseter, W. Mark Ford, Richard H. Odom, and Karl V. Miller. "Abiotic Factors Influencing Deer Browsing in West Virginia." Northern Journal of Applied Forestry 23, no. 1 (March 1, 2006): 20–26. http://dx.doi.org/10.1093/njaf/23.1.20.
Abstract:
Abstract We present a comparison of woody browse availability and white-tailed deer (Odocoileus virginianus) use among clearcut interiors, skidder trail edges, and mature forest and an evaluation of the relative importance of aboitic factors in predicting browsing pressure within regenerating clearcuts in the central Appalachians of West Virginia. We sampled 810 1-m2 plots in or adjacent to nine regenerating clearcuts (8–19 ha) during the summer of 2001. Availability and use of woody browse did not differ between clearcut interior and skidder trail plots for any species observed. Plots in the adjacent mature forest had less woody browse availability and higher utilization. Overall use of available woody browse in clearcuts was >15%. Combining all woody species, elevation (wI = 0.618) and distance to mature forest (wI = 0.379) were more important than landform index, plot surface shape, aspect, and slope in predicting deer browsing pressure in regenerating clearcuts. We believe that without management activities aimed at reducing deer browsing, in many parts of this region the ability of forest managers to regenerate stands will be jeopardized and the forested ecosystem will be compromised.
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Hakim, M. L., T. Alam, M. H. Baharuddin, and M. T. Islam. "Frequency Integration of Dual-band Hexagonal Metamaterial Resonator antenna for Wi-Fi and 5G Wireless Communication." Journal of Physics: Conference Series 2250, no. 1 (April 1, 2022): 012001. http://dx.doi.org/10.1088/1742-6596/2250/1/012001.
Abstract:
Abstract The integration of 5G mm-wave and Wi-Fi frequency bands becomes significant for upcoming 5G wireless applications for providing a large frequency ratio. This work presents a frequency reconfigurable hexagonal metamaterial resonator (HMR) antenna for Wi-Fi and a 5G mm-wave frequency band. A PIN diode is utilized to link up a microstrip patch antenna (MPA) with HMR to achieve integration of the Wi-Fi frequency band. The resonant frequency of the proposed antenna is 5 GHz (Wi-Fi) and 27.87 GHz with peak gain 2.33 dB and 7.12 dB, respectively. The operating bandwidth of the proposed antenna is 800 MHz (4.5-5.3 GHz) and 1020 MHz (27.35-28.37 GHz). The rogers RT5880 substrate with thickness 0.508 mm, dielectric constant 2.2, and loss tangent 0.009 has been used for designing the antenna. The overall size of the antenna is 30×23×0.508 mm3.
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Chen, Hongkai, Sirajum Munir, and Shan Lin. "RFCam." Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies 6, no. 2 (July 4, 2022): 1–29. http://dx.doi.org/10.1145/3534588.
Abstract:
As cameras and Wi-Fi access points are widely deployed in public places, new mobile applications and services can be developed by connecting live video analytics to the mobile Wi-Fi-enabled devices of the relevant users. To achieve this, a critical challenge is to identify the person who carries a device in the video with the mobile device's network ID, e.g., MAC address. To address this issue, we propose RFCam, a system for human identification with a fusion of Wi-Fi and camera data. RFCam uses a multi-antenna Wi-Fi radio to collect CSI of Wi-Fi packets sent by mobile devices, and a camera to monitor users in the area. With low sampling rate CSI data, RFCam derives heterogeneous embedding features on location, motion, and user activity for each device over time, and fuses them with visual user features generated from video analytics to find the best matches. To mitigate the impacts of multi-user environments on wireless sensing, we develop video-assisted learning models for different features and quantify their uncertainties, and incorporate them with video analytics to rank moments and features for robust and efficient fusion. RFCam is implemented and tested in indoor environments for over 800 minutes with 25 volunteers, and extensive evaluation results demonstrate that RFCam achieves real-time identification average accuracy of 97.01% in all experiments with up to ten users, significantly outperforming existing solutions.
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Ancans, Guntis, Vjaceslavs Bobrovs, Arnis Ancans, and Evaldas Stankevicius. "Analysis on Interference Impact of Wi-Fi on Digital Terrestrial Television Broadcasting." International Journal of Interdisciplinary Telecommunications and Networking 8, no. 1 (January 2016): 35–44. http://dx.doi.org/10.4018/ijitn.2016010104.
Abstract:
Transition from Analogue Terrestrial Television Broadcasting to Digital Terrestrial Television Broadcasting (DTTB) in the 470-862 MHz band made available amount of spectrum so-called digital dividend for other services i.e. 790-862 MHz band (800 MHz) to mobile service. Recently the 694-790 MHz band (700 MHz) was also allocated to mobile service in ITU Region 1. Spectrum allocated to a broadcasting service but not used locally is called as TV white spaces (TVWS). It is possible to introduce TVWS services in 470-790 MHz band under the condition that other services in this band already operating, or planned in the country and in neighboring countries, are adequately protected and this use does not violate the current ITU Radio Regulations. TVWS under some conditions locally could be used for mobile communication systems e.g. unlicensed Wireless Fidelity (Wi-Fi) using cognitive radio. As TVWS are located in the UHF band, the use of TVWS can provide significantly better coverage and wall penetration inside buildings than 2.4 GHz and 5 GHz range Wi-Fi frequencies. The exact amount of available spectrum for TVWS at any location will be dependent upon each country national situation e.g. DTTB planning configuration, other services use in the band. In case of deploying Wi-Fi in the TVWS the interference impact of Wi-Fi on DTTB has to be taken into account. The aim of this paper is to analyze the interference impact of Wi-Fi on DTTB. In this paper the interference occurring probability in DTTB receiver was evaluated by using Spectrum Engineering Advanced Monte-Carlo Analysis Tool (SEAMCAT).
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Shur, Pavel Z., Darya N. Lir, Vadim B. Alekseev, Anastasiya O. Barg, Ilia V. Vindokurov, and Ekaterina V. Khrushcheva. "Work intensity and work modification amid implementation of anti-epidemic activities." Hygiene and sanitation 102, no. 10 (November 20, 2023): 1069–77. http://dx.doi.org/10.47470/0016-9900-2023-102-10-1069-1077.
Abstract:
Introduction. Assessment of work intensity (WI) is challenged by several methodical complications. It may involve certain underestimation of an actual hazard category of working conditions and fails to consider work modification.
Materials and methods. The study relies on using analytical, sociological, and statistical methods. To test the selected approach, a sample was created from workers with mostly mental work (n=137, 77% females). Their average age was 43.9±8.0 years; average work experience was 14.5±3.7 years.
Results. In this article, we suggest certain approaches to assessing WI. They include self-assessment of a factor using a specifically designed questionnaire; they clarify indicators that describe WI; when assessing working conditions, they rely on matrices of interrelated indicators. This procedure makes it possible to estimate levels of individual components and create an integral WI profile as well as identify contributions made by various intensity types to its overall structure. When testing the procedure, we established workers with mostly mental work to tend to have harmful working conditions as per WI factor (the hazard category 3.1 in 24.8% of the cases; 3.2, 56.9% of the cases; and the hazard category 3.3 in 17.5% of the cases). Mental (28.6±6.1%) and sensory (24.0±7.0%) loads are limiting components. Amid implementation of anti-epidemic activities, work regime was established as the most sensitive WI component (its contribution grew from 11.1±6.0 to 16.0±5.7%, p<0.05). Working conditions moved to a higher hazard category for 35.8% workers.
Limitations. Assessment of working conditions uses threshold values introduced more than 30 years ago and can be adjusted for the existing employment conditions. The testing was accomplished on a rather small sample, which was biased as per gender and included workers with different occupations and positions.
Conclusion. The suggested approaches offer wider opportunities to assess working conditions as per WI with respect to some occupations. This may substantiate a list of indicators that should be regulated by the existing sanitary legislation. Investigation of possible modification of factors during the pandemic makes it possible to describe eligibility of anti-epidemic activities without any deterioration of working conditions.
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Lee, Seungeun, So-Yeon Lee, Joon-Yong Jung, Yoonho Nam, Hyeon Jun Jeon, Chan-Kwon Jung, Seung-Han Shin, and Yang-Guk Chung. "Ensemble learning-based radiomics with multi-sequence magnetic resonance imaging for benign and malignant soft tissue tumor differentiation." PLOS ONE 18, no. 5 (May 31, 2023): e0286417. http://dx.doi.org/10.1371/journal.pone.0286417.
Abstract:
Many previous studies focused on differentiating between benign and malignant soft tissue tumors using radiomics model based on various magnetic resonance imaging (MRI) sequences, but it is still unclear how to set up the input radiomic features from multiple MRI sequences. Here, we evaluated two types of radiomics models generated using different feature incorporation strategies. In order to differentiate between benign and malignant soft tissue tumors (STTs), we compared the diagnostic performance of an ensemble of random forest (R) models with single-sequence MRI inputs to R models with pooled multi-sequence MRI inputs. One-hundred twenty-five STT patients with preoperative MRI were retrospectively included and consisted of training (n = 100) and test (n = 25) sets. MRI included T1-weighted (T1-WI), T2-weighted (T2-WI), contrast-enhanced (CE)-T1-WI, diffusion-weighted images (DWIs, b = 800 sec/mm2) and apparent diffusion coefficient (ADC) maps. After tumor segmentation on each sequence, 100 original radiomic features were extracted from each sequence image and divided into three-feature sets: T features from T1- and T2-WI, CE features from CE-T1-WI, and D features from DWI and ADC maps. Four radiomics models were built using Lasso and R with four combinations of three-feature sets as inputs: T features (R-T), T+CE features (R-C), T+D features (R-D), and T+CE+D features (R-A) (Type-1 model). An ensemble model was built by soft voting of five, single-sequence-based R models (Type-2 model). AUC, sensitivity, specificity, and accuracy of each model was calculated with five-fold cross validation. In Type-1 model, AUC, sensitivity, specificity, and accuracy were 0.752, 71.8%, 61.1%, and 67.2% in R-T; 0.756, 76.1%, 70.4%, and 73.6% in R-C; 0.750, 77.5%, 63.0%, and 71.2% in R-D; and 0.749, 74.6%, 61.1%, and 68.8% R-A models, respectively. AUC, sensitivity, specificity, and accuracy of Type-2 model were 0.774, 76.1%, 68.5%, and 72.8%. In conclusion, an ensemble method is beneficial to incorporate features from multi-sequence MRI and showed diagnostic robustness for differentiating malignant STTs.
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Rubio, Leticia, Ramona Díaz-Vico, Inés Smith-Fernández, Aníbal Smith-Fernández, Juan Suárez, Stella Martin-de-las-Heras, and Ignacio Santos. "Spectrophotometric Color Measurement to Assess Temperature of Exposure in Cortical and Medullar Heated Human Bones: A Preliminary Study." Diagnostics 10, no. 11 (November 20, 2020): 979. http://dx.doi.org/10.3390/diagnostics10110979.
Abstract:
Heated-bone color changes may provide information about temperature of exposure, with interest for anthropologists and forensic experts. The aim of this study was to assess heat-induced color changes by spectrophotometry in cortical and medullar human bones heated at different temperatures and times. CIELAB (International Commission on Illumination-LAB) color parameters (L*, a*, and b*) and whiteness (WI) and yellowness (YI) indexes were obtained by spectrophotometry in the cortical and medullar zones of 36 bone sections exposed at 200, 400, 600, and 800 °C for 30 and 60 min. The accuracy of color-based temperature estimations was evaluated by Receiver Operating Characteristics (ROC) analysis. Chromaticity a* showed the best significant discrimination power with the area under the ROC curve (AUC) values ranged from 0.9 to 1.0 in cortical zones and 0.7 to 1.0 in medullar zones for all temperatures of exposures and both time of exposures. Chromaticity b*, and WI and YI indexes showed an AUC of 1.0 at 400, 600, and 800 °C for 30 and 60 min in the cortical and medullar zones. The spectrophotometric color parameters provided a highly accurate estimation of the temperature of exposure to discriminate between temperatures and exposure times in the cortical and medullar zones. Spectrophotometric bone color measurement in cortical and medullar zones can be an objective and reproducible method to estimate the temperature of exposition, and it can be considered useful for forensic and anthropological purposes.
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Bhawiyuga, A., R. A. Sabriansyah, W. Yahya, and R. E. Putra. "A Wi-Fi based Electronic Road Sign for Enhancing the Awareness of Vehicle Driver." Journal of Physics: Conference Series 801 (January 2017): 012085. http://dx.doi.org/10.1088/1742-6596/801/1/012085.
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Sulistiyadi, Akhmad Haris, Ari Suwondo, and Sugiyanto Sugiyanto. "Optimalisasi Informasi Citra T1 W1 Post-Contrast Dengan Fat Saturation dan Pengaturan Time Repetition: Studi pada Pemeriksaan Magnetic Resonance Imaging Brain dengan Kasus Tumor." Jurnal Imejing Diagnostik (JImeD) 1, no. 1 (July 2, 2015): 36–43. http://dx.doi.org/10.31983/jimed.v1i1.3149.
Abstract:
Background: Fat saturation is an alternative technique to improve image information in T1 WI post contrast MRI of brain tumor. It can increase lesion conspituity by suppressing normal tissue’s signal. To optimize image information by using fat saturation, selection of Fat Saturation type and Time Repetition (TR) value are important.Objectives: to analyze the differences in T1 WI post-contrast image information in MRI of brain tumor in various type of Fat Saturation and TR value.Methods: Experimental study with factorial design conducted in Telogorejo Hospital-Semarang. Nine combinations (9 groups) of three Fat Saturation types (none, weak, and strong) by three TR values (700 ms, 750 ms, and 800 ms) were given to 12 patients of MRI brain tumor. Image informations were assessed by measuring SNR (white matter, gray matter, lesions, surrounding tissue), CNR (white matter- gray matter, white matter-CSF, gray matter-CSF, lesion- surrounding tissue), lesion conspituity, artifacts, and contrast image in general.Results: The results showed that there were significant differences in SNR of white matter, gray matter, and in surrounding tissue (p 0.05); CNR of white matter-CSF, gray matter-CSF, lesion-tissue surrounding tissue (p 0.05); and lesion conspituity (p 0.05) between groups with no sat fat, weak fat sat, and strong fat sat. There were significant differences in SNR of white matter, gray matter, and surrounding tissue (p 0.05); and CNR of white matter-CSF, gray matter-CSF, and lesion- surrounding tissue (p 0.05) between group TR 700 ms, TR 750 ms, and TR 800 ms.Conclusion: Combination of strong fat saturation and TR 700 ms can produce the most optimal image information.
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Dzierzbicka-Glowacka, L., A. Lemieszek, M. Kalarus, and I. M. Żmijewska. "Modelling the population dynamics of <i>Temora longicornis</i> in the Basin Gdańsk (southern Baltic Sea)." Biogeosciences Discussions 10, no. 7 (July 22, 2013): 12347–84. http://dx.doi.org/10.5194/bgd-10-12347-2013.
Abstract:
Abstract. The ecosystem model 3-D CEMBS connected with the population model, described in this paper, was used to determine the temporal distributions of T. longicornis in the Gdańsk Basin (the southern Baltic Sea) divided into the coastal zone P2 (the Gulf of Gdańsk) and the open sea P1 (Gdańsk Deep). The population model for T. longicornis consists of twelve equations for twelve states of variables, six for the mass Wi and six for the abundance Zi, i.e. two states of variables Wi and Zi, for each of the six model stages of the development; the stages were grouped as follows: eggs – Egg, stages not taking food – NI–NII, subsequent stages of nauplii – NIII–NVI, two copepodid stages – CI–CIII and CIV–CV and the last stage of adult organisms – CVI. Seasonal dynamics of T. longicornis is described by average changes in the total biomass as a sum of biomass of the examined ontogenesis stages, which are the sum of the products of the mass Wi and the abundance Zi of individual organisms at a given stage. The empirical verification of the population model based on in situ data obtained from the analysis of biological material collected in 2010–2011 in the region of Gdańsk Deep (P1) and in the western part of Gdańsk Bay (P2), and in 2006–2007 – only in Gdańsk Bay (P2). The highest values of the modelled T. longicornis biomass occurred in the period of high temperatures, i.e. in summer, in June 2010 and July 2011 in the Bay of Gdańsk – at station P2, and between late June and early July, and for almost the whole summer in Gdańsk Deep – at station P1, and amounted to respectively ca. 5200 mgw.w. m–2 and 6300 mgw.w. m–2 at station P2 and 24 500 mgw.w. m–2 and 27 800 mgw.w. m–2 at station P1. In 2006 and 2007 at station P2 the highest numerical values were recorded between late July and early August, exactly at the same time as environmental data, and amounted to 4300 mgw.w. m–2 and 5800 mgw.w. m–2, respectively. The results determined from the model are 0.25–2 times higher compared to in situ data. The most similar values were obtained for 2007.
Dissertations / Theses on the topic "WI 810":
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Monnien, Franck. "Biomarqueurs histopronostiques de l'adénocarcinome canalaire du pancréas : évaluation d’un panel immunohistochimique intégrant les trois compartiments tumoraux épithéliaux, fibroblastiques et immunitaires." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2023. http://www.theses.fr/2023UBFCE021.
Abstract:
La recherche d’abords thérapeutiques innovants est particulièrement d’actualité dans l’adénocarcinome canalaire du pancréas (ACP) tant le pronostic de ce cancer, dont l’incidence augmente, reste redoutable. Une des voies d’exploration réside dans la compréhension des mécanismes entrainant l’importante réaction stromale habituellement constatée dans l’ACP et prédisant la résistance à la chimiothérapie. Cette réorganisation tissulaire ou desmoplasie, résulte de l’activation de cellules normales présentes dans le tissu conjonctif de l’organe touché par les cellules tumorales d’origine épithéliale. Se développe ainsi un terreau fertile pour l’expansion des cellules cancéreuses, dont les fibroblastes activés sont un des acteurs prépondérants. Afin de mieux appréhender les interactions entre ces fibroblastes associés au cancer (CAF), les cellules tumorales et le reste du microenvironnement tumoral, l’étude de leur(s) mode(s) d’activation apparaît comme un préalable et pourrait permettre une stratification des patients dans leur orientation thérapeutique. L’identification d’un panel d’anticorps pertinent utilisable in situ en immunohistochimie (IHC) est donc un des enjeux pour la prise en charge future des patients atteints d’ACP et constitue l’objectif de ce travailThe search for innovative therapeutic approaches is particularly topical in pancreatic ductal adenocarcinoma (PDAC), as its prognosis remains daunting. One of the avenues of exploration lies in the understanding of the mechanisms leading to the important stromal reaction usually observed in PDAC predicting resistance to chemotherapy. This tissue reorganization or desmoplasia results from the activation of normal cells present in the connective tissue of the organ affected by tumor cells of epithelial origin. A fertile breeding ground for the expansion of cancer cells develops, of which activated fibroblasts are one of the most important players. In order to better understand the interactions between these cancer-associated fibroblasts (CAF), tumor cells and the rest of the tumor microenvironment, their characterization appears as a prerequisite and could allow stratification of patients in their therapeutic orientation. The identification of a relevant antibody panel that can be used in situ in immunohistochemistry (IHC) is therefore an issue for the future management of patients with PDAC and is the objective of this work
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Dunya, Sadif. "Einsatz von Bacillus subtilis und Lactobacillus-Stämmen zur Entwicklung und Gestaltung technischer Vegetationssysteme für die Gleisbett-Naturierung." Doctoral thesis, Humboldt-Universität zu Berlin, Landwirtschaftlich-Gärtnerische Fakultät, 2005. http://dx.doi.org/10.18452/15243.
Abstract:
Das Ziel der Arbeit war die Entwicklung einer Begrünungsmethode für Gleisbette mit schneller Vegetationsentwicklung. Zur Begrünung wurden Sedumpflanzen verwendet, die durch den Einsatz von Bacillus subtilis, Lactobacillus und Nährsubstrat (allein und kombiniert) in verschiedenen Vegetationssystemen auf dem nährstoffarmen Standort Gleisbett etabliert werden sollten. Die Aktivität der inokulierten Mikroorganismen wurde indirekt über den Einfluss auf die Vegetationsleistung ermittelt. Der Einsatz von B. subtilis und Lactobacillus bewirkte eine signifikante Wachstumsförderung der oberirdischen Pflanzenteile. Die Anwendung von Nährsubstrat als Bodenhilfsmittel war ebenfalls für das Pflanzenwachstum besonders wirksam, sowohl allein appliziert als auch in Kombination mit den Bakterien. Darüber hinaus führte die Applikation der Bakterien und des Nährsubstrates zu einem reduzierten Trockenstress auf Geotextilmatten. Die Wahl des Substrates war entscheidend für die Wirksamkeit der Bakterieninokulation. Jedoch hatten höhere Versuchstemperaturen und pH-Werte ebenfalls eine positive Wirkung auf das Pflanzenwachstum. Diese Einflüsse waren in Kombination mit Ziegelbruchsubstrat wesentlich stärker als mit den anderen getesteten Substrattypen. Das Ziegelbruchsubstrat kombiniert mit einer Bakterien- und Nährsubstratbehandlung bewährte sich als günstiges, umweltschonendes Begrünungsverfahren von Gleisbettanlagen.The aim of the present study was to develop and improve existing methods for the remediation of rail tracks using soil borne bacteria. Through the use of Bacillus subtilis and Lactobacillus ssp. alone and in combination with a nutrient solution three different growth substrates were tested. The substrates were brick chips, textile mats, and mineral wool mats. Brick chips were tested along railway tracks in Munich but all three substrates were tested along an artificial rail track on the experimental station at the Humboldt University-Berlin. Plants selected for remediation belong to the genus Sedum, which is relatively tolerant to dry conditions. The use of Bacillus subtilis and Lactobacillus in combination with a nutrient solution improved plant growth significantly. Plants inoculated with bacteria showed increased growth during the first three months but after four months there was no longer any significant difference between treatments. The addition of nutrient solution alone improved plant growth. Plant growth was significantly different on all three substrates, whereas brick chips were the best substrate. The results of this study indicate that the quality of the substrate is the most important factor for remediation and greening of rail tracks. Both bacteria tested had only a limited effect. High temperature and pH resulted in larger Sedum plants in the open field. Brick chips are a cheap substrate which can be used for rail track greening. The rapid growth of plants can be influenced by the application of an additional nutrient solution as well as inoculation with Lactobacillus and/or B. subtilis.
Book chapters on the topic "WI 810":
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Dingli, Alexiei, and Dylan Seychell. "Using RFID and Wi-Fi in Healthcare." In Healthcare Administration, 771–88. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-6339-8.ch039.
Abstract:
Europe faces a considerable challenge in providing good quality health care in the forthcoming future as the aging population increases. The phenomenon also results in a considerable cost on society due to the dependency on the public health sector particularly because such individuals would not be able to contribute to the economy. On the other hand, younger persons would need to make alternative arrangements to assist their elderly parents or relatives, potentially affecting productivity. The project PervasIve Nursing And docToral Assistant (PINATA) seeks to tackle this matter through the merging of Ambient Intelligence (AmI) and semantic web technologies. PINATA utilises pervasive devices to aid doctors and nurses to focus on the patient and thus improve the quality of healthcare services. This project proves the significant importance of using wireless technology in healthcare. This paper focuses on the use of Wi-Fi and RFID in an effort to enable continuous and intelligent monitoring of patients' conditions remotely. Results show that the detection system performs well (over 80%) accuracy on fall detection and the manual readings mapped 100% with the results collected by the system over the Wi-Fi infrastructure discussed in this paper.
Conference papers on the topic "WI 810":
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Yakoot, Mostafa Sa'eed, Adel Mohamed Salem Ragab, and Omar Mahmoud. "Multi-Class Taxonomy of Well Integrity Anomalies Applying Inductive Learning Algorithms: Analytical Approach for Artificial-Lift Wells." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206129-ms.
Abstract:
Abstract Well integrity has become a crucial field with increased focus and being published intensively in industry researches. It is important to maintain the integrity of the individual well to ensure that wells operate as expected for their designated life (or higher) with all risks kept as low as reasonably practicable, or as specified. Machine learning (ML) and artificial intelligence (AI) models are used intensively in oil and gas industry nowadays. ML concept is based on powerful algorithms and robust database. Developing an efficient classification model for well integrity (WI) anomalies is now feasible because of having enormous number of well failures and well barrier integrity tests, and analyses in the database. Circa 9000 dataset points were collected from WI tests performed for 800 wells in Gulf of Suez, Egypt for almost 10 years. Moreover, those data have been quality-controlled and quality-assured by experienced engineers. The data contain different forms of WI failures. The contributing parameter set includes a total of 23 barrier elements. Data were structured and fed into 11 different ML algorithms to build an automated systematic tool for calculating imposed risk category of any well. Comparison analysis for the deployed models was performed to infer the best predictive model that can be relied on. 11 models include both supervised and ensemble learning algorithms such as random forest, support vector machine (SVM), decision tree and scalable boosting techniques. Out of 11 models, the results showed that extreme gradient boosting (XGB), categorical boosting (CatBoost), and decision tree are the most reliable algorithms. Moreover, novel evaluation metrics for confusion matrix of each model have been introduced to overcome the problem of existing metrics which don't consider domain knowledge during model evaluation. The innovated model will help to utilize company resources efficiently and dedicate personnel efforts to wells with the high-risk. As a result, progressive improvements on business, safety, environment, and performance of the business. This paper would be a milestone in the design and creation of the Well Integrity Database Management Program through the combination of integrity and ML.
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Hall, Freeman F. "Cirrus cloud transmittance and backscatter measured with an infrared CO2 lidar." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.mz5.
Abstract:
We have measured the transmittance of cirrus clouds at 10.59-μm wavelength with a CO2 lidar using two independent methods. The first method used backscatter from the calibration target El Chichon stratospheric cloud that was present over Boulder during 1982 and 1983. The second method used conical lidar scans at different zenith angles when uniform cirrus decks were present during the 1986 FIRE intensive observations in Oshkosh, WI. Extinction coefficients from both methods average 0.1 km−1 for thin cirrus, 0.5 km thick to 0.6 km−1 for cirrus several kilometers thick. There is a wide standard deviation in extinction values. Extinction to backscatter ratios vary from ~800 sr for thin clouds to 2600 sr for thick clouds.
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Aba, NorFarah Diana, Mohd Shamsul Farid Samsudin, Muzdalifah Zakaria, Azmi Mohammed Nor, Russell Varley, and Jane Zhang. "A New Sustainable Self-Healing System; Autonomous Repair for Glass Reinforced Epoxy Liner for Water Injector Tubing." In SPE Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210767-ms.
Abstract:
Abstract Often in the water injector (WI) system with liners, the "unseen" damage such as micro scratch is very difficult to be detected, and these micro scratches, when not detected will eventually become a major damage. Employing self-healing technology in the liner will ensure that the minor damage will be healed autonomously during operation, subsequently preventing further major damage. The in-situ healing of the damages is one of the amazing criteria offered by this technology. The integrity of the WI system is eventually assured, prolonging the service life of the materials and avoiding unnecessary expensive inspection and maintenance. In this present work, self-healing technology has been developed for the epoxy-based materials used in glass-reinforced (GRE) liner system for WI tubing. The novel self-healing additives were synthesized using a facile synthesis method and have been proven to be able to potentially replace the expensive rare-earth based catalyst, hence making the commercial step viable. The metal-organic frameworks (MOFs) microcapsules self-healing in the epoxy-based liner system demonstrated successful autonomous healing efficiency at elevated temperatures as examined using a 3D-profilometer, with a healing efficiency of more than 80%. The system with the self-healing additives was able to recover the barrier performance of the liner, up to 98% efficiency as shown by the electrochemical impedance spectroscopy (EIS) assessment. In addition to that, within 2 hours of healing activation by temperature, the samples with the self-healing additives were able to autonomously heal, reaching more than 50% healing efficiency. Moreover, this self-healing system was able to heal a damage width of up to 700µm, for more than 80% healing efficiency. It is worth mentioning that the healing ability remained functional even though the samples had been exposed to harsh conditions for 1000 hours. The healing agent particularly contained in the microcapsules remains intact and stable throughout the stability study, hence suggesting a robust self-healing system. This finding shows the possibility of this technology to provide a sustainable production of self-healing additives for a liner in water injector's well, hence potentially improving the integrity of the materials.
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Feiner, Leonhard, Florian Canzek, and Johannes Fottner. "Evaluation of the Usability and Intuitiveness of a Teleoperated Forklift." In 15th International Conference on Applied Human Factors and Ergonomics (AHFE 2024). AHFE International, 2024. http://dx.doi.org/10.54941/ahfe1005417.
Abstract:
Forklifts are still one of the most popular transport vehicles in intralogistics. However, the number of inexperienced employees increases. Due to innovations in technologies like steer-by-wire and data transfer via Wi-Fi or 5G, teleoperated machines are constantly evolving. This possibility can solve many challenges in intralogistics. Still, there is also a risk that teleoperation reduces intuitiveness due to the lack of feedback from the machine's status, such as occurring accelerations. The paper presents a study to compare a teleoperation concept with a conventional forklift control concept. In the present study, no difference in perceived usability, stress load and intuitiveness could be determined. Both control concepts were rated with an SUS value of 80 for the conventional control and 74 for the teleoperated control in the range of "good" to "excellent". The raw NASA TLX and QUESI values showed promising results for both concepts.
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Woods, A. I., and M. A. Lazzari. "ASPIRIN FAILURE TO INHIBIT THE RELEASE OF PLASMINOGEN ACTIVATORS-INHIBITORS BY HUMAN PLATELETS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643126.
Abstract:
Platelet-PA-Inhibitors can be released by thrombin, Col laaen( Col) and others.If they are physiologically important,inhibition of their release might facilitate thrombolysis.Intrinsic PA were tested in euclobulins (eug)of PPP and PPP+Washed platelets(WP) ,with and without aspirinf ASA) .treated with UK,SK and Col(20 atfd l2uo/ml) Results(mm2)were:euaPPP:232+78;+3×106WP/ul:217+71;+10%7ul:188+/5 +2×106MP/ul: 157+69:With UK:eugPPP:283+76;+3×l0517P/ul :234+69;+106 WP/ul :172+55;+2×l(PWP/ul :154+48; With SK:euoPPP:303+99;+3×l05WP/ul 252+65;+1067P/ul:203+68;+2×106UP/ul: 174+85;Wi th Col (20ug/ml) :eur PPP:234+97;+3×105WP/ul:160+63;+106WP/ul:141+73;+2×l06WP/ul:129+81; +2×106WP/ul+ASA: 105+31;Wi th Col uc/ml) :euaPPP:230+56;+3×l05NP/ul: 160+52;+106WP/ul:139+44;+2×106wp/ul:126+21;+2×106WP/ul+ASA:118+28. EugPPP+l/P showed lower lysis area.Col induced more decrease of lysis area in euc with WP.ASA did not modify this effect.UK and SK produced higher lysis area only in euoPPP.No difference was observed between high and low doses of Col-effect upon WP.Combined treatment of eucPPP+WP+Col, with UK and SK showed:(mm2):UK-treated eugPPP+2×106WP/ul+Col(29ug/ml):134+25;+ASA and Col(20ug/ml):115+65;+Col(2uc/ml):157+50;+ASA and Col(2uo/ml):133+49; SK-treated eupPPP+2×106WP/ul:+Col(20uo/ml):144+49;+ASA and Col(20ug/ml):128+ 60;+Co1(2ug/ml):173+66;+ASA and Col(2ug/ml):142+36.Col (20ug/ml) produced slight lower lysis area of UK and SK-treated eugPPP+WP. (p:ns). ASA did not modify this effect.Col (2uc/ml) did not produce changes in lysis area of UK and SK-treated eupPPP +WP. ASA produced slight lower lysis area(p:ns).Conclusion: high dosis of Col could release anti UK,anti SK and intrinsic PA-inhibitors from platelets;low dosis of Col could only release fntrinsic PA-inhibi tors. It suggests that anti UK and anti SK release might be triggered by stronger stimuli than intrinsic PA inhibitors.ASA could not inhibit any inhibitors release.We must consider that PA-inhibi tors could be released by different metabolic pathways other than cyclooxygenase pathway.
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Peronto, John, Jordan Komp, and Alejandro Fernandez. "Tall Mass Timber Present and Future – 2 Case Studies." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.0655.
Abstract:
<p>According to the 2018 UN Global Status Report, “buildings construction and operations accounted for 36% of global final energy use and nearly 40% of energy-related carbon dioxide (CO2) emissions in 2017”. [1] In a society leaning towards sustainable practices and efficiency, the improved structural properties of mass timber compared to traditional wood construction present a unique opportunity to add a sustainable material to the designer’s palette. This paper will focus on three subject areas:</p> <ul> <li>Current code challenges and developments related to the IBC</li> <li>Ascent, a 21-story mass timber tower currently underway in Milwaukee, WI. Upon completion, Ascent would be the tallest timber building in the Western Hemisphere. In addition to discussing the structural engineering principals behind the tower design, the team will elaborate on the current challenges associated with a project of this magnitude.</li> <li>River Beech, a research project centered on an 80-story all timber tower that pushes the limits of mass timber construction to pinpoint technical challenges that require future research. River Beech incorporates a high level of prefabrication and modularization, and utilizes a high degree of automation common to the mass timber construction fabrication process.</li> </ul> <p>The authors, based on their experience during the design of the case studies referenced above, will present an innovative technology capable of addressing the urban challenges related to building in a 21st century metropolis, while incorporating a sustainable and accessible material.</p>
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Robinson, Brian S., and M. Keith Sharp. "Space Cooling Potentials for Ambient Energy Sources Across the US." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54419.
Abstract:
While solar energy provides a source for passive space heating across a variety of climates, other ambient energy sources may be more appropriate for passive space cooling. These ambient resources include ambient air at dry-bulb and wet-bulb temperatures, ground temperature at locations where the soil is cooler than the indoor comfort temperature, and night-sky radiant temperature, which is substantially lower than ambient air in most climates. The focus of this study was on comparing these sources to cooling loads across climates in the US. Using a degree-day approach, annual cooling potentials were calculated for over 800 TMY3 locations. Color-themed maps for each ambient source at several indoor comfort temperature ranges were constructed as visual references for design purposes. In addition, eight US cities (Denver, CO, Los Angeles, CA, Louisville, KY, Madison, WI, Miami, FL, New Orleans, LA, Phoenix, AZ and Washington DC) were selected to represent a range of climate characteristics, including seasonal ambient temperature, diurnal temperature swings, humidity and sky clearness. For each city, an ambient potential to cooling load ratio (ALR) was calculated, with the potential based on an indoor comfort temperature range of 68°F – 72°F and the load calculated with a base temperature of 65°F. ALR, which neglects phase lags between source and load and the associated need for thermal storage, exceeded one for dry-bulb air and for ground temperature for all locations except Miami, New Orleans and Phoenix. Wet-bulb ALR exceeded one for all locations except Miami, and sky ALR exceeded one for all locations. Finally, the effect of limited thermal storage was estimated by calculating daily ambient source fraction, fas, which is the daily ambient cooling potential divided by the daily cooling load. fas thus approximates the cooling potential of systems with one day’s worth of thermal storage, and has an upper limit of one. Fas, the annual sum of fas, equaled one for ground temperature for Los Angeles and Madison and for sky temperature for Denver and Los Angeles. Fas for ground temperature was above 0.9 for all locations except Miami, New Orleans and Phoenix. Fas for sky temperature exceeded 0.6 for all locations. By utilizing all possible combinations of ambient sources, half of the selected locations attained Fas equal to one and the minimum for all locations still exceeded 0.65.