Journal articles on the topic 'Bowtie method'
To see the other types of publications on this topic, follow the link: Bowtie method.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Bowtie method.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
de Ruijter, A., and F. Guldenmund. "The bowtie method: A review." Safety Science 88 (October 2016): 211–18. http://dx.doi.org/10.1016/j.ssci.2016.03.001.
2
Turner, Claire, W. I. Hamilton, and Martyn Ramsden. "Bowtie diagrams: A user-friendly risk communication tool." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 231, no. 10 (November 2017): 1088–97. http://dx.doi.org/10.1177/0954409716675006.
Abstract:
The rail infrastructure controller in Great Britain recognised that more work was required to allow a robust and consistent demonstration that appropriate health and safety risk assessments are being undertaken throughout each stage of the contracting process. In response to this requirement, the authors were engaged to assist the rail infrastructure client with the development of a new risk-based contractor management and assurance process. Bowtie diagrams were selected as a key component of this process to represent: Key safety risks associated with rail construction projects; Potential causes and consequences of unwanted events; Good practice in risk barriers/controls. To test the suitability of Bowties for risk communication to contractors, three key hazards were identified for Bowtie analysis. These and the specific top events selected were as follows: Hazard: Working at height – from scaffold, ladders, mobile elevating working platforms, mobile towers or ledges; Top event: Falls from height – to surface; Hazard: Working in vicinity of uninsulated conductors and supply points; Top event: Contact with live/charged equipment >60 V; Hazard: Working on or near the line; Top event: Personnel in path of oncoming train. A one-day Bowtie development workshop was held for each of the hazards selected. These were attended by client personnel with the required knowledge and expertise of the hazard and associated barrier measures, ensuring the necessary levels of input and consultation. Feedback to date on the Bowtie approach has been positive, both within the client and contractor organisations. Bowties provide a method of communicating the client’s expectations about levels of protection to infrastructure project contractors and address the following key requirements: Allow contractors to understand risk management requirements in detail and to price jobs accordingly; Enable identification of gaps in the barrier of key risks and facilitate implementation of best practice; Can be used by the client as a project safety assurance tool to check the risk management measures in place against those defined in the Bowtie; Demonstrate to the regulator that the client is communicating a clear ‘safety story’ throughout a project. This paper describes the Bowtie development process in accordance with Ten Golden Rules including how human factors can be incorporated in a systematic and meaningful way. It will demonstrate how the Bowties developed within this project represent in a clear and accessible manner what constitutes industry best practice with regard to controlling important safety risks in construction projects.
3
Aust, Jonas, and Dirk Pons. "A Systematic Methodology for Developing Bowtie in Risk Assessment: Application to Borescope Inspection." Aerospace 7, no. 7 (June 29, 2020): 86. http://dx.doi.org/10.3390/aerospace7070086.
Abstract:
Background—Bowtie analysis is a broadly used tool in risk management to identify root causes and consequences of hazards and show barriers that can prevent or mitigate the events to happen. Limitations of the method are reliance on judgement and an ad hoc development process. Purpose—Systematic approaches are needed to identify threats and consequences, and to ascertain mitigation and prevention barriers. Results—A new conceptual framework is introduced by combining the Bowtie method with the 6M structure of Ishikawa to categorise the threats, consequences and barriers. The method is developed for visual inspection of gas turbine components, for which an example is provided. Originality—Provision of a more systematic methodology has the potential to result in more comprehensive Bowtie risk assessments, with less chance of serious omissions. The method is expected to find application in the broader industry, and to support operators who are non-risk experts but have application-specific knowledge, when performing Bowtie risk assessment.
4
Zamree Amin and Roslina Mohammad. "Bowtie analysis for risk assessment of confined space at sewerage construction project." Progress in Energy and Environment 24, no. 1 (March 27, 2023): 22–34. http://dx.doi.org/10.37934/progee.24.1.2234.
Abstract:
This paper aims to investigate the issues related to safety in confined space at the sewerage treatment plant construction project in the Hulu Langat district and to provide a solution by proposing a substantial approach to mitigating risk during confined space entry due to an ineffective risk assessment and poor compliance by project management. The methods used were site visit observation and survey, followed by an analysis of the selected risk assessment method. The site visit to the sewerage treatment plant project investigated the compliance of confined space risk assessment documents to established requirements such as OSHA 1994, FMA 1967, ICOP 2010, HIRARC Guidelines 2008, Quebec Regulation 2015, ISO 31010, HSE UK, and BCGA UK. The selected risk assessment method was analyzed with Bowtie Risk Assessment by referring to the preventive approach concept or barrier analysis. Next, additional information relevant to risk assessment from journals was included. Evaluation of Bowtie Risk Assessment was conducted through a focus group discussion (FGD), which plays an essential role in developing the Bowtie risk assessment graphical framework. The proposed Bowtie Risk Assessment graphical framework provides a sewerage treatment plant construction project with a holistic technique for preventing confined space accidents. It also provides a safe work system, manages hazards and risks effectively, promotes good leadership practices, improves company reputation, and significantly reduces accident costs. The framework is also helpful as a reference model for other industry players.
5
Twumasi, Baidenger Agyekum, and Jia-Lin Li. "Numerical simulation study on bowtie antenna-based time reversal mirror for super-resolution target detection." Journal of Electrical Engineering 70, no. 3 (June 1, 2019): 236–43. http://dx.doi.org/10.2478/jee-2019-0032.
Abstract:
Abstract Bowtie antenna-based time reversal mirror (TRM), incorporating with randomly distributed and arbitrarily shaped wire metamaterials medium, is proposed to realize super-resolution target detection. The achieved performance for standard and scatterer bowtie antenna TRM is compared and discussed. The dual-band bowtie antennas resonate at 2.45 GHz and 5.2 GHz and a super-resolution of 0.0817 of the free-space wavelength at 2.45 GHz has been achieved. For the first time, studies show that the TRM with microstructure perturbations (namely scatterers) can enhance the resolution in some cases. Proposing a method of super-resolving transmission of electromagnetic waves is very important to realize multi-independent channels in a compact space for the related applications.
6
Astles, Karen, and Roland Cormier. "Implementing Sustainably Managed Fisheries Using Ecological Risk Assessment and Bowtie Analysis." Sustainability 10, no. 10 (October 12, 2018): 3659. http://dx.doi.org/10.3390/su10103659.
Abstract:
Determining the effectiveness of a management system to enable fisheries to harvest sustainably is a key challenge. To fully assess the likelihood that a fishery management system will not achieve its sustainability objectives, the assessment needs to include the whole pathway that leads to the consequences for management objectives. A crucial aspect of the pathway is the inclusion of management controls. Effectiveness of these management controls determines whether the effects of human pressures on ecological components and their impacts are reduced to a level that will not impede management achieving their objectives. Ecological risk assessments do not provide sufficient information to make decisions about what to change specifically in a management system to ensure a fishery is sustainably managed. Bowtie analysis (BTA) is a method that logically connects the relationships between management objectives, management controls, threats, potential impacts of threats on the fishery resource and the consequences of those impacts on achieving the management objectives. The combination of bowtie analysis and ecological risk assessment enables managers, scientists and stakeholders to evaluate different management controls and research options in response to risk factors and track the effectiveness of the management system. We applied a three-step method of bowtie analysis stage 1, quantitative ecological risk assessment and bowtie analysis stage 2 to evaluate fisheries management and science. We demonstrate these steps using a case study of a commercially fished species in New South Wales, Australia.
7
Bhayangkara, Anugraha Hari, Ary Setyawan, and Fajar Sri Handayani. "ANALISIS KECELAKAAN KERJA PADA STRUKTUR BAWAH BLENDING SILO PROYEK “EPC TALAVERA” TUBAN MENGGUNAKAN METODE BOWTIE." Jurnal Riset Rekayasa Sipil 7, no. 1 (September 29, 2023): 40. http://dx.doi.org/10.20961/jrrs.v7i1.79202.
Abstract:
The "EPC Talavera" Tuban Project is one of the major projects located in Tuban. Given that the construction of the Blending Silo is being built at a considerable height and certainly requires a large foundation structure, the construction of the Blending Silo carries a relatively high risk of workplace accidents. The purpose of this research is to identify workplace accident risks and evaluate the causes, impacts, and risk responses to accidents during the construction of the substructure of the Blending Silo in the "EPC Talavera" project. To determine the dominant workplace accident risks, risk assessment is performed using probability and severity calculations based on the Risk Management Standard AS/NZ 4360:1999, resulting in an Importance Index value. The method used to evaluate the causes, impacts, and risk responses to workplace accidents is the Bowtie Analysis Method. The results of this research indicate that the most dominant workplace accident risks are the risk of workers being pierced by sharp equipment, the risk of fingers getting caught in the bar bender machine, and the risk of workers being shocked/electrocuted by electrical currents. Based on the bowtie method, the most dominant causes of workplace accidents are scattered sharp equipment, careless/inattentive/unhealthy workers, inadequate equipment, poor bar bender machine conditions, bar bender machine operating methods, exposed welding tool cables, rainy/extreme weather conditions, and electrical current leaks in welding tool bodies. The most dominant impacts of workplace accidents are minor injuries, serious injuries/death, fires, and damage to the bar bender machine. Using the bowtie method, risk responses or controls for the most dominant workplace accident risks are also analyzed, along with an analysis of escalation factors and their controls.
8
Shi, Hualiang, Ya Yan Lu, and Qiang Du. "Analyzing bowtie structures with sharp tips by a vertical mode expansion method." Optics Express 26, no. 24 (November 21, 2018): 32346. http://dx.doi.org/10.1364/oe.26.032346.
9
Putri, Ezmeyralda, Mona Lestari, Novrikasari Novrikasari, Desheila Andarini, Anita Camelia, Poppy Fujianti, and Titi Nurhaliza. "Bowtie Method: Study of Occupational Health and Safety Risks in Cement Production Process." Media Kesehatan Masyarakat Indonesia 17, no. 4 (December 31, 2021): 124–33. http://dx.doi.org/10.30597/mkmi.v17i4.17948.
Abstract:
The kiln area is an area that has a very complex hazard potential in the cement production process. This study aimed to assess the risks of occupational safety and health during the production process in the kiln area of PT. X uses the bowtie method. This study used a qualitative descriptive design. The informants used were three managers of the clinker production department, one safety manager, and one field operator. Research data were collected through interviews and observations. The data were analyzed qualitatively using the bowtie method. The study results stated that hot dust could be dangerous if it comes out of the system caused by positive pressure, such as the Induced Draft Fan (IDF) turning off, causing losses such as burns to workers. Heat can be dangerous if it experiences a significant increase due to excess fuel, causing losses, such as health-related illnesses. Preventive controls were carried out such as routine inspections. Mitigation controls were carried out such as light signals. Escalation factors can thwart hot dust and heat control, such as the deformation of raw meals. Escalation factor control, such as the implementation of work instructions. PT. X has carried out control in the kiln area, but additional controls are needed.
10
Mubarok, Ahmad, Yuni Trio Anggoro, Hadi Prayitno, and Arief Rusdyansyah. "Risk Assessment of Aircraft Refueling Activities at the Indonesian Flight Academy Banyuwangi Using the Bowtie Method and Shell Model Human Factor." Journal of Mechanical, Civil and Industrial Engineering 5, no. 1 (January 19, 2024): 09–15. http://dx.doi.org/10.32996/jmcie.2024.5.1.2.
Abstract:
This study aims to assess the risks involved in aircraft refueling activities at the Indonesian Pilot Academy in Banyuwangi, using the Bowtie method and the SHELL Model Human Factor. The study adopts a qualitative descriptive approach to understand the emerging risks and human factors associated with the activity. Based on the research findings, fire risk emerges as the most dominant. These risks are then analyzed using the Bowtie method and the SHELL Model Human Factor to gain a comprehensive understanding of the causes and consequences of fire risk. Several identified causes of fire risk include non-compliance with procedures, absence of fuel flow measuring devices and fuel drum handling equipment, visual impairment due to sunlight, and inadequate temporary fuel storage conditions. Potential impacts include fire and significant damage to the aircraft. This research makes an important contribution to enhancing safety by providing relevant safety recommendations for aircraft refueling activities at the Indonesian Pilot Academy in Banyuwangi.
11
Aust and Pons. "Bowtie Methodology for Risk Analysis of Visual Borescope Inspection during Aircraft Engine Maintenance." Aerospace 6, no. 10 (October 2, 2019): 110. http://dx.doi.org/10.3390/aerospace6100110.
Abstract:
Background—The inspection of aircraft parts is critical, as a defective part has many potentially adverse consequences. Faulty parts can initiate a system failure on an aircraft, which can lead to aircraft mishap if not well managed and has the potential to cause fatalities and serious injuries of passengers and crew. Hence, there is value in better understanding the risks in visual inspection during aircraft maintenance. Purpose—This paper identifies the risks inherent in visual inspection tasks during aircraft engine maintenance and how it differs from aircraft operations. Method—A Bowtie analysis was performed, and potential hazards, threats, consequences, and barriers were identified based on semi-structured interviews with industry experts and researchers’ insights gained by observation of the inspection activities. Findings—The Bowtie diagram for visual inspection in engine maintenance identifies new consequences in the maintenance context. It provides a new understanding of the importance of certain controls in the workflow. Originality—This work adapts the Bowtie analysis to provide a risk assessment of the borescope inspection activity on aircraft maintenance tasks, which was otherwise not shown in the literature. The consequences for maintenance are also different compared to flight operations, in the way operational economics are included.
12
Chorsi, Hamid T., and Stephen D. Gedney. "Efficient high-order analysis of bowtie nanoantennas using the locally corrected Nyström method." Optics Express 23, no. 24 (November 24, 2015): 31452. http://dx.doi.org/10.1364/oe.23.031452.
13
Setianingsih, Dika, and Hasyim Asyari. "Hazard Identification Using Task Risk Assessment Method and Bowtie Analysis (Case Study: PT. Varia Usaha Beton)." Jurnal Sistem Teknik Industri 26, no. 1 (January 29, 2024): 103–12. http://dx.doi.org/10.32734/jsti.v26i1.14417.
Abstract:
PT. Varia Usaha Beton is a subsidiary of PT. Semen Indonesia Beton, which produces various types of products. PT Varia Usaha Beton (BSP Purwokerto) has an open work area where there are potential hazards such as physical factors, chemical factors and ergonomic factors. The aim of this research is to identify hazards, assess risks and control risks in the production process of ready-mixed concrete so that workplace accidents can be minimized. The methods used in this research are task risk assessment and bowtie analysis. Based on the research results, it was found that 1 risk belonged to the low category, 27 risks belonged to the medium category, and 11 risks belonged to the high category. Based on the bow-tie method, the major risks are exposure to fly ash and cement dust, risk of diesel spills, and risk of electric shock. The main causes of workplace accidents are pipe leaks and improper diesel filling. The main risk effects of workplace accidents are worker injury, and fire. The bowtie analysis method determines that the risk of electric shock is due to a damaged cable and the existing protective barrier is intended to replace the damaged cable. This risk has consequences, namely injuries to workers.
14
Moulay, Mohammed, Mehadji Abri, and Hadjira Abri Badaoui. "Quad-Band Bowtie Antenna Design for Wireless Communication System Using an Accurate Equivalent Circuit Model." International Journal of Microwave Science and Technology 2015 (January 22, 2015): 1–7. http://dx.doi.org/10.1155/2015/637607.
Abstract:
A novel configuration of quad-band bowtie antenna suitable for wireless application is proposed based on accurate equivalent circuit model. The simple configuration and low profile nature of the proposed antenna lead to easy multifrequency operation. The proposed antenna is designed to satisfy specific bandwidth specifications for current communication systems including the Bluetooth (frequency range 2.4–2.485 GHz) and bands of the Unlicensed National Information Infrastructure (U-NII) low band (frequency range 5.15–5.35 GHz) and U-NII mid band (frequency range 5.47–5.725 GHz) and used for mobile WiMAX (frequency range 3.3–3.6 GHz). To validate the proposed equivalent circuit model, the simulation results are compared with those obtained by the moments method of Momentum software, the finite integration technique of CST Microwave studio, and the finite element method of HFSS software. An excellent agreement is achieved for all the designed antennas. The analysis of the simulated results confirms the successful design of quad-band bowtie antenna.
15
Yousif, Bedir B., and Ahmed S. Samra. "Modeling of Optical Nanoantennas." Physics Research International 2012 (November 8, 2012): 1–10. http://dx.doi.org/10.1155/2012/321075.
Abstract:
The optical properties of plasmonic nanoantennas are investigated in detail using the finite integration technique (FIT). The validity of this technique is verified by comparison to the exact solution generalized Mie method (GMM). The influence of the geometrical parameters (antenna length, gap dimension, and shapes) on the antenna field enhancement and spectral response is discussed. Localized surface plasmon resonances of Au (gold) dimers nanospheres, bowtie, and aperture bowtie nanoantennas are modeled. The enhanced field is equivalent to a strong light spot which can lead to the resolution improvement of the microscopy and optical lithography, thus increasing the optical data storage capacity. Furthermore, the sensitivity of the antennas to index changes of the environment and substrate is investigated in detail for biosensing applications. We confirm that our approach yields an exact correspondence with GMM theory for Au dimers nanospheres at gap dimensions 5 nm and 10 nm but gives an approximation error of less than 1.37% for gap dimensions 1 nm and 2 nm with diameters approaching 80 nm. In addition, the far-field characteristics of the aperture bowtie nanoantenna such as directivity and gain are studied. The promising results of this study may have useful potential applications in near-field sample detection, optical microscopy, and so forth.
16
Tan, Chunjian, Shaogang Wang, Huiru Yang, Qianming Huang, Shizhen Li, Xu Liu, Huaiyu Ye, and Guoqi Zhang. "Hydrogenated Boron Phosphide THz-Metamaterial-Based Biosensor for Diagnosing COVID-19: A DFT Coupled FEM Study." Nanomaterials 12, no. 22 (November 16, 2022): 4024. http://dx.doi.org/10.3390/nano12224024.
Abstract:
Recent reports focus on the hydrogenation engineering of monolayer boron phosphide and simultaneously explore its promising applications in nanoelectronics. Coupling density functional theory and finite element method, we investigate the bowtie triangle ring microstructure composed of boron phosphide with hydrogenation based on structural and performance analysis. We determine the carrier mobility of hydrogenated boron phosphide, reveal the effect of structural and material parameters on resonance frequencies, and discuss the variation of the electric field at the two tips. The results suggest that the mobilities of electrons for hydrogenated BP monolayer in the armchair and zigzag directions are 0.51 and 94.4 cm2·V−1·s−1, whereas for holes, the values are 136.8 and 175.15 cm2·V−1·s−1. Meanwhile, the transmission spectra of the bowtie triangle ring microstructure can be controlled by adjusting the length of the bowtie triangle ring microstructure and carrier density of hydrogenated BP. With the increasing length, the transmission spectrum has a red-shift and the electric field at the tips of equilateral triangle rings is significantly weakened. Furthermore, the theoretical sensitivity of the BTR structure reaches 100 GHz/RIU, which is sufficient to determine healthy and COVID-19-infected individuals. Our findings may open up new avenues for promising applications in the rapid diagnosis of COVID-19.
17
Alani, S. H. N., and A. M. R. Mahjoob. "Corruption Risk Analysis at the Project Planning Stage in the Iraqi Construction Sector using the Bowtie Methodology." Engineering, Technology & Applied Science Research 11, no. 3 (June 10, 2021): 7223–27. http://dx.doi.org/10.48084/etasr.4060.
Abstract:
In this paper, the bowtie method was utilized by a multidisciplinary team in the Federal Board of Supreme Audit (FBSA)for the purpose of managing corruption risks threatening the Iraqi construction sector. Corruption in Iraq is a widespread phenomenon that threatens to degrade society and halt the wheel of economic development, so it must be reduced through appropriate strategies. A total of eleven corruption risks have been identified by the involved parties in corruption and were analyzed by using probability and impact matrix and their priority has been ranked. Bowtie analysis was conducted on four factors with high score risk in causing corruption in the planning stage. The number and effectiveness of the existing proactive measures to prevent threats from resulting in corruption and were examined for each threat.
18
Althuwayb, Ayman A. "MTM- and SIW-Inspired Bowtie Antenna Loaded with AMC for 5G mm-Wave Applications." International Journal of Antennas and Propagation 2021 (January 29, 2021): 1–7. http://dx.doi.org/10.1155/2021/6658819.
Abstract:
This paper investigates a feasible configuration of slotted bowtie antenna based on MTM and SIW properties for 5G millimeter-wave applications. To realize the proposed slotted bowtie antenna in a compact dimension with high performances, the MTM and SIW concepts are implemented by applying the trapezoidal slots on the top surface of the antenna and metallic via holes through the substrate layer connecting the top surface to the ground plane. The antenna has been fed with a simple microstip-line which is connected to a waveguide-port. It is shown that the slotted bowtie antenna with a small dimension of 30 × 16 × 0.8 mm3 operates over a measured wideband of 32–34.6 GHz with the fractional bandwidth, average gain, and radiation efficiency of 7.8%, 3.2 dBi, and 50%, respectively. To improve the antenna's performance, the artificial magnetic conductor (AMC) properties have been employed on the ground plane by loading vertical and linear slots with various lengths. The AMC slots are aligned under the trapezoidal slots on the top surface to transfer the maximum electromagnetic signals to them for optimum radiation. The proposed method enlarges the antenna’s effective aperture area, keeping constant its physical dimensions. The proposed AMC-loaded antenna covers wider frequency range of 30–37 GHz in measurement, which corresponds to 21% fractional bandwidth. The average experimental gain and radiation efficiency have been increased to 5.5 dBi and 66.5%, respectively, which illustrate the effectiveness of the proposed AMC-loaded antenna. The results confirm that the proposed slotted bowtie antenna with advantages of compact dimension, wide bandwidth, high gain and efficiency, low profile, being cost-effective, simple design, and easy fabrication process, which makes it applicable for mass production, can be a good candidate for 5G millimeter-wave applications.
19
Liu, Jingyi, Lianchun Long, and Yang Yang. "Modeling of Enhanced Polar Magneto-Optic Kerr Effect by Surface Plasmons in Au Bowtie Arrays." Nanomaterials 13, no. 2 (January 6, 2023): 253. http://dx.doi.org/10.3390/nano13020253.
Abstract:
The weak magneto-optical (MO) signal of traditional MO materials is indeed an important issue for their further practical applications. Although many strategies have been proposed to improve the MO effect, hybridization with noble metal nanostructures is a promising route in recent years due to the high localized-surface plasmon resonances (LSPR) effect. A new magneto-optical surface plasmon resonance (MOSPR) structure hybrid with Au bowtie arrays is proposed to increase the measuring range of the polar magneto-optical Kerr effect (PMOKE) and the quality factor through the LSPR effect. It is verified by a numerical simulation of the finite element method (FEM). The optimized parameters were found by modulating the shape and geometric dimensions. Owing to the significant LSPR from the Au bowties, a PMOKE amplification signal spectrum with narrow linewidth, and a high amplitude with high-sensing performance was achieved. Compared with the bare magnetic film alone, by optimizing the relevant parameters of the LSPR structure, the maximum signal increases 3255 times, and the quality factor can be greatly improved, which would provide important guidance and help for the practical application of MO devices.
20
Pettinari, Giorgio, Loris Angelo Labbate, Mayank Shekhar Sharma, Silvia Rubini, Antonio Polimeni, and Marco Felici. "Plasmon-assisted bandgap engineering in dilute nitrides." Nanophotonics 8, no. 9 (April 5, 2019): 1465–76. http://dx.doi.org/10.1515/nanoph-2019-0025.
Abstract:
AbstractThe inherent ability of plasmonic bowtie nanoapertures (NAs) to localize the electromagnetic field at a subwavelength scale was exploited to engineer the H removal process in dilute nitrides at the nanometer level. Dilute nitride semiconductor alloys (e.g. GaAsN with a small percentage of nitrogen) are characterized by peculiar optoelectronic properties and, most importantly, by an even more peculiar response to hydrogen incorporation. In this class of materials, it is indeed possible to tune post-growth the alloy bandgap energy by a controlled incorporation of hydrogen atoms. The formation of N-H complexes neutralizes all the effects N has on the host matrix, among which is the strong narrowing of bandgap energy. In the present work, bowtie NAs resonant to the N-H complex dissociation energy were numerically modeled by finite element method simulations, realized by a lithographic approach, and characterized by scanning probe microscopy and resonant scattering spectroscopies. The conditions to get the maximum field enhancement at a specific position below the metal/semiconductor interface, namely at the dilute nitride quantum well position, were identified, demonstrating the ability to achieve a plasmon-assisted spatially selective hydrogen removal in a GaAsN/GaAs quantum well sample. Hydrogen removal through bowtie NAs turns out to be way more efficient (approximately two orders of magnitude) than through the plain surface, thus indicating that bandgap engineering through plasmonic nanostructures can be optimized for future efficient realization of site-controlled single-photon emitters and for their deterministic integration in plasmonic devices.
21
Wierman, John C. "Equality of the Bond Percolation Critical Exponents for Two Pairs of Dual Lattices." Combinatorics, Probability and Computing 1, no. 1 (March 1992): 95–105. http://dx.doi.org/10.1017/s0963548300000092.
Abstract:
The substitution method is used to show that the percolative behaviour of the triangular and hexagonal lattices bond percolation models are similar near their critical probabilities. As a consequence, if the limits defining the critical exponents β and γ exist, these lattices have the same values of β and γ. Similarly, the method also shows equality of the β and γ values for bond percolation models on the bowtie lattice and its dual.
22
Silva, Gustavo F. O., Augusto Borella, Rodrigo Chamusca Machado, Carlos Aberto Almeida, Luiz Penido, Renan Carvalho, Andre Mengatti, and Luciana J. Alcantara. "Dynamic Risk Advisor – real time bowtie risk assessment monitoring system." APPEA Journal 62, no. 1 (May 13, 2022): 92–105. http://dx.doi.org/10.1071/aj21120.
Abstract:
This paper describes the development of a Dynamic Risk Advisor to improve safety of operations in fleet marine construction and production oil and gas vessels, well, and subsea equipment in process safety management, providing rig management onshore and offshore tools to assess health, safety, and environment (HSE) performance in real time. This tool uses the bowtie methodology, and provides a useful framework to present a risk ‘picture’ and to satisfy management of health and safety at work regulations. The focus of the methodology is the relationship between safeguards (control systems/equipment, process controls, and human factors) and an overview of the safety process monitoring in a simple and visual form. As facilities and equipment age, those safeguards may become less effective or degraded (different from the condition at the moment of risk assessment creation/revision), risks may increase and that is why they must be monitored using an effective, continuous, and temporal-aware method. Ocyan and Viasat/Intelie created a solution to identify and analyse the hazards dynamically (in real time) using the LIVE streaming data platform, providing an interface that allows the client to manage the current risk profile of their assets using a bowtie diagram. Additionally, this also provides a way for the user to assess the effect of degraded safeguards on complex operations in real time, by monitoring the actual residual risk. The study started in 2019 and was developed together with the Ocyan HSE team and was extended to all fleet due to the positive results. The tool can be accessed from mobile phones and tablets.
23
Lin, Xin, Weihai Zhuo, Haikuan Liu, and Tianwu Xie. "Potential of Fluid Dynamic Bowtie Filter for Dose Reduction and Image Quality Improvement of Cone-Beam CT." Applied Sciences 12, no. 18 (September 18, 2022): 9346. http://dx.doi.org/10.3390/app12189346.
Abstract:
Reducing radiation dose to patients without compromising imaging quality has been an important issue in the medical use of X-ray computed tomography (CT). In this study, based on the conceptual designs of different types of attenuation filters, the radiation doses to patients who undergo a typical head, thorax and abdomen scan using a cone-beam CT with different scanning protocols were simulated using the Monte Carlo method, and the isotropy of the noise power spectrum (NPS) of the reconstructed images was also calculated. Compared to the scanning protocol without attenuation and tube current modulation (TCM), the results showed that the fluid dynamic bowtie filter (FDB) combined with the TCM technique reduced the average organ dose by 70%, 34% and 60% for a typical head, thorax and abdomen scan, respectively, and the NPS isotropy of the reconstructed images was also significantly improved. Compared to most currently used static bowtie filters, the FDB has a higher potential to reduce the dose for patients undergoing CT scans. Further efforts are warranted to make the FDB technique clinically useful.
24
Ku, Yun-Cheng, Mao-Kuen Kuo, and Jiunn-Woei Liaw. "Streamlines of the Poynting Vector and Chirality Flux around a Plasmonic Bowtie Nanoantenna." Nanomaterials 14, no. 1 (December 25, 2023): 61. http://dx.doi.org/10.3390/nano14010061.
Abstract:
The streamlines of the energy flux (Poynting vectors) and chirality flux as well as the intensity of the electric field around various plasmonic nanostructures (nanocube, nanocuboid, nanotriangle, hexagonal nanoplate and bowtie nanoantenna) induced by a circularly polarized (CP) or linearly polarized (LP) light were studied theoretically. The boundary element method combined with the method of moment was used to solve a set of surface integral equations, based on the Stratton–Chu formulation, for analyzing the highly distorted electromagnetic (EM) field in the proximity of these nanostructures. We discovered that the winding behavior of these streamlines exhibits versatility for various modes of the surface plasmon resonance of different nanostructures. Recently, using plasmonic nanostructures to facilitate a photochemical reaction has gained significant attention, where the hot carriers (electrons) play important roles. Our findings reveal a connection between the flow pattern of energy flux and the morphology of the photochemical deposition around various plasmonic nanostructures irradiated by a CP light. For example, numerical results exhibit vertically helical streamlines of the Poynting vector around an Au nanocube and transversely twisted-roll streamlines around a nanocuboid. Additionally, the behaviors of the winding energy and chirality fluxes at the gap and corners of a plasmonic bowtie nanoantenna, implying a highly twisted EM field, depend on the polarization of the incident LP light. Our analysis of the streamlines of the Poynting vector and chirality flux offers an insight into the formation of plasmon-enhanced photocatalysis.
25
Muhamad Nadzir, Norsaidah, Mohamad Kamal A. Rahim, Farid Zubir, and Huda A. Majid. "UHF RFID Antenna Tag Design and Analysis for Antenna Miniaturization." ELEKTRIKA- Journal of Electrical Engineering 18, no. 2 (August 31, 2019): 49–54. http://dx.doi.org/10.11113/elektrika.v18n2.164.
Abstract:
This paper proposes four designs of UHF RFID antenna tag with two different radiating element, copper and aluminum, for antenna miniaturization. The main contribution of this work is the unique design that involves a meander line traced in a variety shape of a bowtie antenna. The UHF RFID band is achieved by reshaping a 900 MHz straight line dipole antenna into the form of a bowtie, thus reducing the size of the antenna significantly while maintaining the operating frequency. The effectiveness of the method is tested in multiple steps. First, the antenna tag designs are run through CST software simulations and optimized to achieve desired outcome. Next, the designs are transferred to Silhouette Studio software to be fabricated using a cutting machine, and finally measured using a vector network analyzer. The comparison between the measurement result of the reflection coefficient and the radiation pattern to their respective simulation results shows that they have a good agreement between each other. With further research and improvements, the size of the antenna tag could be further reduced while maintaining or even improving the performance of the antenna tag.
26
Putra, I. Gede Swastama, Iman Basriman, and Sugiarto Sugiarto. "Implementasi Manajemen Risiko Penularan Covid-19 terhadap Perawat Indonesia di Kuwait melalui Metode Bowtie." Jurnal Pemberdayaan Ekonomi 2, no. 2 (August 2, 2023): 101–19. http://dx.doi.org/10.35912/jpe.v2i2.2347.
Abstract:
Purpose: The purpose of this service is to obtain an overview of the implementation of COVID-19 transmission risk management for Indonesian nurses working in Kuwait through the Bowtie method. Methodology: This research is quantitative in nature using a scientific approach to the implementation of risk management for the transmission of COVID-19 in Indonesian nurses working in Kuwait where these nurses work in various health services in Kuwait. This research was conducted using a descriptive analytic method using a cross-sectional study design. Result: The results of the study found that: 1) The application of risk management (risk control or mitigation) in handling COVID-19 in various health services in Kuwait such as the implementation of hospitalization for staff who were confirmed positive and the existence of a COVID-19 vaccination program had a significant effect on the transmission of COVID-19 -19 in Indonesian Nurses working in Kuwait. 2) The level of knowledge about the importance of preventing and transmitting COVID-19 to Indonesian nurses in Kuwait has a very significant influence on the transmission of COVID-19. 3) The level of compliance of Indonesian nurses with infection prevention control measures or health protocols has a significant effect on the transmission of COVID-19 in Indonesian nurses working in various health services in Kuwait.
27
Putra, I. Gede Swastama, Iman Basriman Basriman, and Sugiarto Sugiarto. "Implementasi Manajemen Risiko Penularan Covid-19 terhadap Perawat Indonesia di Kuwait melalui Metode Bowtie." Yumary: Jurnal Pengabdian kepada Masyarakat 4, no. 1 (September 12, 2023): 27–45. http://dx.doi.org/10.35912/yumary.v4i1.2386.
Abstract:
Purpose: The purpose of this service is to obtain an overview of the implementation of COVID-19 transmission risk management for Indonesian nurses working in Kuwait through the Bowtie method. Methodology: This research is quantitative in nature using a scientific approach to the implementation of risk management for the transmission of COVID-19 in Indonesian nurses working in Kuwait where these nurses work in various health services in Kuwait. This research was conducted using a descriptive analytic method using a cross-sectional study design. Result: The results of the study found that: 1) The application of risk management (risk control or mitigation) in handling COVID-19 in various health services in Kuwait such as the implementation of hospitalization for staff who were confirmed positive and the existence of a COVID-19 vaccination program had a significant effect on the transmission of COVID-19 -19 in Indonesian Nurses working in Kuwait. 2) The level of knowledge about the importance of preventing and transmitting COVID-19 to Indonesian nurses in Kuwait has a very significant influence on the transmission of COVID-19. 3) The level of compliance of Indonesian nurses with infection prevention control measures or health protocols has a significant effect on the transmission of COVID-19 in Indonesian nurses working in various health services in Kuwait.
28
Fedosov, A. V., N. Kh Abdrakhmanov, A. S. Guseva, and R. R. Akhmetyanov. "Possibility of using the results of non-destructive testing for assessing occupational risks in the labor protection management system." Safety of Technogenic and Natural System, no. 1 (March 2, 2022): 4–8. http://dx.doi.org/10.23947/2541-9129-2022-1-4-8.
Abstract:
Introduction. The paper discusses the methods for occupational risks assessment of workers within the framework of the labor protection management system. To date, there is no legally approved methodology for occupational risks assessment. Numerous well-known methods of ORS are advisory in nature. Their main weak point is the influence of the human factor and, consequently, the relative subjectivity of the final conclusions.Problem Statement. The main objective of this work is to study the possibility of occupational risks assessment of workers by the "Bow tie" method in the occupational safety management system.Theoretical Part. The method of risk assessment "Bow tie" was adopted as a basis. The main components of this method are considered. Approbation has been carried out. It is proposed to introduce an additional barrier into the "Bowtie" risk assessment method, which is called "Non-destructive control".Conclusions. As a result, a technique for occupational risks assessment was proposed, taking into account the results of non-destructive testing. The positive aspects of the proposed approach are also identified.
29
Goran, Petrus Kerowe, and Eka Setia Nugraha. "Asymmetric-Slit Method on WiFi Antenna with 2.4 GHz and 5 GHz Frequency." IJITEE (International Journal of Information Technology and Electrical Engineering) 4, no. 2 (September 16, 2020): 53. http://dx.doi.org/10.22146/ijitee.55811.
Abstract:
Wireless Fidelity (WiFi) devices are often used to access the internet network, both for working and in information searching. Accessing the internet can be administered anywhere provided that the area is within the WiFi devices range. A WiFi device uses 2.4 GHz and 5 GHz operating frequencies. There were several methods employed in the previous studies so that an antenna design could work in two different frequencies, i.e., winding bowtie method, Sierpinski method, and double-circular method. This paper employed a simple method, the slit method. The objective of this paper is to discover a simple antenna model that works on 2.4 GHz and 5 GHz frequencies. This paper employed a square patch microstrip antenna with a slit method. The dimensions of the designed square patch microstrip antenna were 42.03 mm × 27.13 mm × 0.035 mm. The antenna worked at 2.4 GHz and 5 GHz frequencies. The obtained simulation results after the optimization showed that the square patch microstrip antenna using the slit method acquired a value of S11 (return loss) of -10.15 dB at a frequency of 2.4 GHz and -37.315 dB at a frequency of 5 GHz.
30
Uchroński, Piotr. "Analysis of the Operation of the Ground Handling Agent in the Aspect of Safety." Journal of KONBiN 50, no. 1 (March 1, 2020): 319–39. http://dx.doi.org/10.2478/jok-2020-0019.
Abstract:
AbstractThe role of the human factor in aviation is a critical element for the safety of flight operations. It is described by methods such as SHELL and BowTie, which propose solutions to minimize the risk of occurrence of aviation events. The work presents the development of these concepts by introducing the method of testing the predisposition of airport staff using a specialized system which is the Polipsychograph - a system dedicated to designing and carrying out psychological tasks testing human mental, cognitive and motor skills in connection with the assessment of his professional capabilities. The work contains the results of 40 tests performed on employees dealing with airport ground handling on a daily basis. Research has shown that the employee’s predisposition depends on the quality of work entrusted to him. The paper presents a method of assessing the psychophysical predisposition of an employee allowing him to be directed to work corresponding to his qualifications.
31
SMOCZYŃSKI, Piotr, Adrian GILL, Adam KADZIŃSKI, Martin LAUR, and Tambet ÕUN. "APPLICATION OF AN IMPROVED BOWTIE METHOD IN A CSM-COMPLIANT RISK ASSESSMENT OF A CHANGE INTRODUCED IN THE EU RAILWAY SYSTEM." Transport Problems 17, no. 2 (June 30, 2022): 127–36. http://dx.doi.org/10.20858/tp.2022.17.2.11.
Abstract:
The issue of managing the risk associated with introducing changes to the railway system is very important from the point of view of safety management, as any change can significantly reduce the level of safety of a railway system. For this reason, such changes are regulated at the European Union (EU) level through a dedicated legal act known as the Common Safety Method for risk assessment (CSM). The example presented in this paper is a portion of the analysis carried out for an Estonian freight carrier with a bowtie method, which we improved so that it fully complies with the CSM requirements. This analysis concerns a change consisting of allowing the possibility of a freight train being driven by one person (with no assistant driver). The case study presented in the paper, although limited due to confidentially issues, allows a full description of how to use the proposed method in real-world applications.
32
Park, Jihye, Sae Jung Na, Jung Sook Yoon, Seoree Kim, Sang Hoon Chun, Jae Jun Kim, Young-Du Kim, Young-Ho Ahn, Keunsoo Kang, and Yoon Ho Ko. "MicroRNA Profiling of Fresh Lung Adenocarcinoma and Adjacent Normal Tissues from Ten Korean Patients Using miRNA-Seq." Data 8, no. 6 (May 25, 2023): 94. http://dx.doi.org/10.3390/data8060094.
Abstract:
MicroRNA transcriptomes from fresh tumors and the adjacent normal tissues were profiled in 10 Korean patients diagnosed with lung adenocarcinoma using a next-generation sequencing (NGS) technique called miRNA-seq. The sequencing quality was assessed using FastQC, and low-quality or adapter-contaminated portions of the reads were removed using Trim Galore. Quality-assured reads were analyzed using miRDeep2 and Bowtie. The abundance of known miRNAs was estimated using the reads per million (RPM) normalization method. Subsequently, using DESeq2 and Wx, we identified differentially expressed miRNAs and potential miRNA biomarkers for lung adenocarcinoma tissues compared to adjacent normal tissues, respectively. We defined reliable miRNA biomarkers for lung adenocarcinoma as those detected by both methods. The miRNA-seq data are available in the Gene Expression Omnibus (GEO) database under accession number GSE196633, and all processed data can be accessed via the Mendeley data website.
33
Africa, Aaron Don Munsayac, Benjamin Emmanuel Uy, and Bianca Clarisse Tan. "Simulations on the effects of an optimized bowtie dipole antenna with an adaptive FIR filter." Bulletin of Electrical Engineering and Informatics 12, no. 3 (June 1, 2023): 1550–59. http://dx.doi.org/10.11591/eei.v12i3.4406.
Abstract:
In the evolution of technology through the years, antennas are use in varying wireless systems have been in demand. Antennas play a great role in transmitting and receiving signals. As its application is heavily used in many days to day activities, it is important to create a cost-efficient and quick way to analyze its performance, characteristics, and relationship to different variables. As many radiation pattern acquisition devices are expensive, this simulation proposes a quick, reliable, and cost-friendly way to simulate 2D patterns in the E-plane and H-plane of a bowtie dipole antenna with an adaptive finite impulse response (FIR) filter. Through this study, the software MATLAB will be utilized to successfully simulate the radiation patterns of antennas with varying lengths. With the use of MATLAB toolboxes, the researchers aim to be able to compare different antenna lengths and determine the relationship and effect of it in the obtained 2D radiation pattern. If this method is successful various antenna applications may be implemented in the future with the use of 2D radiation pattern results.
34
Ryecroft, Samuel, Andrew Shaw, Paul Fergus, Patryk Kot, Khalid Hashim, Adam Moody, and Laura Conway. "A First Implementation of Underwater Communications in Raw Water Using the 433 MHz Frequency Combined with a Bowtie Antenna." Sensors 19, no. 8 (April 16, 2019): 1813. http://dx.doi.org/10.3390/s19081813.
Abstract:
In 2016, there were 317 serious water pollution incidents in the UK, with 78,000 locations where businesses discharge controlled quantities of pollutants into rivers; therefore, continuous monitoring is vital. Since 1998, the environment agency has taken over 50 million water samples for water quality monitoring. The Internet of Things has grown phenomenally in recent years, reaching all aspects of our lives, many of these connected devices use wireless sensor networks to relay data to internet-connected nodes, where data can be processed, analyzed and consumed. However, Underwater wireless communications rely mainly on alternative communication methods such as optical and acoustic, with radio frequencies being an under-exploited method. This research presents real world results conducted in the Leeds and Liverpool Canal for the novel use of the 433 MHz radio frequency combined with a bowtie antenna in underwater communications in raw water, achieving distances of 7 m at 1.2 kbps and 5 m at 25 kbps.
35
McLeod, Ronald, Wendy Russell, Marjorie Stewart, Mark Prentice, and Paul Bowie. "Preliminary case report study of training and support needed to conduct bowtie analysis in healthcare." BMJ Open Quality 10, no. 2 (June 2021): e001240. http://dx.doi.org/10.1136/bmjoq-2020-001240.
Abstract:
BackgroundThere is limited engagement in healthcare with the kinds of proactive approaches to risk assessment used in other industries. Bowtie analysis (BTA) has previously been shown to have potential as a straightforward approach to proactively assessing risk in healthcare. The visual nature of BTA diagrams can aid communication of the essential elements of a complex risk management system. The aim of this small case report study was to investigate the training and support likely to be needed for existing healthcare professionals to conduct BTA in compliance with recognised industry best-practice.MethodOf 17 volunteers who attended training, 3 completed an analysis of significant healthcare risks in the study period: misadministration of gentamicin; unknown development of acute kidney injury and disposal of medical devices containing patient identifiable information (PII). Subjective assessments of the quality of the analyses were made against indicators of BTA best-practice.ResultsUse of the BTA method led to a deeper understanding of the issues and a more thorough understanding of the risks and what was needed to control them than would have been the case if ‘normal practice’ had been followed. Classroom-based training supported by written guidance; however, do not appear adequate to support development of competence to carry out a quality BTA in a healthcare setting.ConclusionsBTA seems to have potential though further evaluation of its application and utility is necessary. The most cost-effective and productive approach is likely to be to train a small number of people to develop deeper skills and experience in BTA. In addition to training and user guidance, the opportunity to facilitate at least one analysis, with some specialist/trainer support, appears to be essential in developing BTA competence.
36
Lamhamdi, Mohamed, Ali Esmaeili, Kiyan Layes, Zakaria El Maaroufi, Georg Rose, Andreas Brensing, and Bernd Schweizer. "Determining of Ablation Zone in Ex Vivo Bovine Liver Using Time-Shift Measurements." Cancers 15, no. 21 (October 31, 2023): 5230. http://dx.doi.org/10.3390/cancers15215230.
Abstract:
This study presents a measurement principle for determining the size of the ablation zone in MWA, which could ultimately form an alternative to more expensive monitoring approaches like CT. The measurement method is based on a microwave transmission measurement. A MWA is performed experimentally on ex vivo bovine liver to determine the ablation zone. This setup uses a custom slot applicator performing the MWA at an operating frequency of 2.45 GHz and a custom bowtie antenna measuring the waves transmitted from the applicator. Furthermore, a custom measurement probe is used to determine the dielectric properties. A time-shift analysis is used to determine the radial extent of the ablation zone. Several measurements are carried out with a power of 50 W for 10 min to show the reproducibility. The results show that this method can provide reproducible outcomes to determine the ablation zone with a maximum error of 4.11%.
37
Chou Chau, Yuan-Fong. "Boosting Second Harmonic Generation Efficiency and Nonlinear Susceptibility via Metasurfaces Featuring Split-Ring Resonators and Bowtie Nanoantennas." Nanomaterials 14, no. 8 (April 11, 2024): 664. http://dx.doi.org/10.3390/nano14080664.
Abstract:
This work investigates a metasurface design to achieve remarkable second harmonic generation (SHG) conversion efficiency and enhance effective nonlinear susceptibility using the finite element method. The elements of the designed structure are composed of a rectangular split-ring resonator Ag film, a bowtie-shaped Ag nanoantenna, and a pair of Bi bars that induce nonlinear optical phenomena due to the nonuniform distribution of the electric and magnetic fields within the device surface. The simulation results agree perfectly with the theory and demonstrate outstanding achievements in terms of SHG conversion efficiency (η) and effective nonlinear susceptibility (χeff(2)). Specifically, the metasurface reaches a peak η value of 4.544×10−8 and an effective nonlinear susceptibility of 3.4×104 pm/V. This work presents a novel and versatile design to achieve high η and χeff(2) in an SHG metasurface.
38
Movazzafgharehbagh, Sanam, and Faruk Karadağ. "Non-Destructive Testing Using Transmission Line-Based Microwave Sensors." Journal of Advanced Applied Sciences 2, no. 2 (December 18, 2023): 73–82. http://dx.doi.org/10.61326/jaasci.v2i2.109.
Abstract:
In this study, some types of antennas and metamaterial structures have been designed and produced with the aim of determining and detecting ionized chlorine of sea sand in concrete. The first structure has a Loop-like resonator with the sample, the second structure has a Bowtie-shaped resonator with the sample and the third structure has double loop resonators on both sides of concrete samples also non-destructive method is applied for all structures. Different samples of concrete are produced with different proportions of ionized sea sand. Electrical properties of concrete samples for all structures are investigated in the frequency range of 1-9 GHz. The structures are designed in the CST Microwave Studio program. Also, the simulation study of the designed structures shows that the most important resonance frequency changes, considering the dielectric constant of concrete samples, for the Loop-like structure occur in the 1-8 GHz, Bowtie-shaped structure in 1-4 GHz and double Loop structure in 1-9 GHz of frequency band. The important point in this study is the changes of the waveform at the resonance frequency. The output waveform (reflection coefficient S11/ transmission coefficient S12) should change in linear form by considering the dielectric coefficient. We have used copper for the resonators and also the material with ℇ value of 3 as the substrate layers of the structures. We have simulated three types of designed structures with CST Microwave Software and then achieve the results and evaluate them. Both numerical and experimental tests have given approximately same results and are in good agreement with each other. These proposed structures can be used in many applications where it is necessary to determine the rate of ionized sea sand in cement-based composites such as concrete.
39
Dhuha, Syamsud, and I. Putu Artama Wiguna. "Risk Analysis of the Mempawah-Sungai Duri National Road Relocation Development Project in West Kalimantan Using the Bow Tie Analysis Method." Journal of Social Research 2, no. 9 (August 22, 2023): 3246–59. http://dx.doi.org/10.55324/josr.v2i9.1387.
Abstract:
The National Road Relocation Development Project in Mempawah, West Kalimantan, functions as a substitute for a national road that will later be affected by the construction of the Kijing International Port in Mempawah Regency, West Kalimantan Province. Current conditions in the field have found several problems that impede the achievement of progress, which poses several risks. This study aims to analyze the highest level of risk from several identified risks. This is why it is important to conduct a risk analysis study on the National Road Relocation Project. This research method uses a qualitative and quantitative approach, starting with the identification of risks in similar projects, then proceeding to test the relevance of risks that may occur and the impact of those risks. Data collection methods were carried out by distributing questionnaires, conducting focus group discussions, and conducting interviews. Furthermore, quantitative analysis was carried out with response scenarios and Bowtie analysis. The results of this study identified the six highest risks: conditions and field data not in accordance with the design, design changes during the project, land for work that has not been acquired, bad weather disturbances, cost overruns, and material price increases. Contingency costs incurred amount to Rp. 15,757,472,740, or 8.34% of the project value, which is Rp. 188,909,724,300.
40
Coombe, Ashley Helvig, LisaMarie Wands, Shannon Stevenson, and Rowena W. Elliott. "Evolving Licensure Examination: Assessing Student Confidence and Accuracy With Next Generation NCLEX." Journal of Nursing Education 63, no. 4 (April 2024): 252–55. http://dx.doi.org/10.3928/01484834-20240207-10.
Abstract:
Background: The Next Generation NCLEX (NGN) includes new item types. Little is known about nursing students' confidence and accuracy in answering these questions. Method: A descriptive comparative study examined prelicensure nursing students' confidence and accuracy in answering NGN-style items versus multiple-choice questions (MCQs) of the same content via a 12-item quiz. Results: Less than one third of students ( n = 194; 32.1%) reported feeling confident in answering NGN questions. Students' confidence levels had no relationship on scores with NGN items. When comparing NGN-style items to MCQs, students' ( n = 221) scores on NGN-style items were lower with bowtie or a select-all-that-apply questions but higher with highlight table or matrix multiple-choice questions. Conclusion: Students' lack of confidence with certain item types suggests faculty should incorporate these item types into classroom activities or course assignments. NGN test-taking strategies also should be incorporated and frequently reinforced throughout the curriculum. [ J Nurs Educ . 2024;63(4):252–255.]
41
Iftimie, N., R. Steigmann, and G. S. Dobrescu. "Ground penetrating radar for real time surveying of soil as bioremediation precursor." IOP Conference Series: Materials Science and Engineering 1235, no. 1 (March 1, 2022): 012060. http://dx.doi.org/10.1088/1757-899x/1235/1/012060.
Abstract:
Abstract GPR is a non-destructive method based on the emission and reception of electromagnetic waves generated by a bowtie antenna, of 400 MHz, in our case. The soil conductivity influences the propagation of electromagnetic waves, thus any inhomogeneity as water lens, chemical pollution, soil texture, buried objects modify the signal scattered on them and recorded by GPR tools. One of the potential advantages of GPR is that it is able to quickly analyses the presence in the underground of various inhomogeneities without having to come into contact with the ground and measures the time interval between pulse generation and reception, the results being presented in B-scan and linescan representation. Combining and processing the received signals, the results show as a map with emphasized watering regions. This paper presents the results of a case study where it was determined the effectiveness of GPR technology in detecting water content as well as the presence of water holes in airport runway draw. Further investigations will include the use of GPR together with electromagnetic induction method in order to make data fusion and increase the probability of detection.
42
Yang, Le, Xiaorong Hong, Jiafang Li, Chang-Yin Ji, Yu Han, Shanshan Chen, Hanqing Jiang, Wei-Li Song, Hao-Sen Chen, and Daining Fang. "Rechargeable Metasurfaces for Dynamic Color Display Based on a Compositional and Mechanical Dual-Altered Mechanism." Research 2022 (October 19, 2022): 1–11. http://dx.doi.org/10.34133/2022/9828757.
Abstract:
Dynamic color display can be realized by tunable optical metasurfaces based on the compositional or structural control. However, it is still a challenge to realize the efficient modulation by a single-field method. Here, we report a novel compositional and mechanical dual-altered rechargeable metasurface for reversible and broadband optical reconfiguration in both visible and near-infrared wavelength regions. By employing a simple fabrication and integration strategy, the continuous optical reconfiguration is manipulated through an electro-chemo-mechanical coupled process in a lithium ion battery, where lithiation and delithiation processes occur dynamically under a low electric voltage (≤1.5 V). By controlling the phase transformation from Si to LixSi, both structural morphology and optical scattering could be rapidly and dramatically tailored within 30 s, exhibiting high-contrast colorization and decolorization in a large-area nanofilm and showing long cyclic stability. Significant wide-angle reconfiguration of high-resolution structural colors in bowtie metasurfaces is demonstrated from anomalous reflection. The results provide a multifield mechanism for reconfigurable photonic devices, and the new platform can be introduced to the multidimensional information encryption and storage.
43
Aust, Jonas, and Dirk Pons. "Methodology for Evaluating Risk of Visual Inspection Tasks of Aircraft Engine Blades." Aerospace 8, no. 4 (April 19, 2021): 117. http://dx.doi.org/10.3390/aerospace8040117.
Abstract:
Risk assessment methods are widely used in aviation, but have not been demonstrated for visual inspection of aircraft engine components. The complexity in this field arises from the variety of defect types and the different manifestation thereof with each level of disassembly. A new risk framework was designed to include contextual factors. Those factors were identified using Bowtie analysis to be criticality, severity, and detectability. This framework yields a risk metric that describes the extent to which a defect might stay undetected during the inspection task, and result in adverse safety outcomes. A simplification of the framework provides a method for go/no-go decision-making. The results of the study reveal that the defect detectability is highly dependent on specific views of the blade, and the risk can be quantified. Defects that involve material separation or removal such as scratches, tip rub, nicks, tears, cracks, and breaking, are best shown in airfoil views. Defects that involve material deformation and change of shape, such as tip curl, dents on the leading edges, bents, and battered blades, have lower risk if edge views can be provided. This research proposes that many risk assessments may be reduced to three factors: consequence, likelihood, and a cofactor. The latter represents the industrial context, and can comprise multiple sub-factors that are application-specific. A method has been devised, including appropriate scales, for the inclusion of these into the risk assessment.
44
Anes, Vitor, António Abreu, Ana Dias, and João Calado. "A Reputational-Risk-Based Match Selection Framework for Collaborative Networks in the Logistics Sector." Sustainability 14, no. 7 (April 6, 2022): 4329. http://dx.doi.org/10.3390/su14074329.
Abstract:
Collaborative networks in the logistics sector have proven to be a solution that both meets environmental footprint reduction goals and addresses the impact of rising fuel prices on logistics companies, especially for small- and medium-sized enterprises. Despite these benefits, these collaborative networks have not received the desired amount of participation due to reputational risk. This paper develops a framework for assessing and managing reputational risk to encourage logistics companies’ participation in collaborative networks. To this end, customer satisfaction factors were correlated with logistics operations, and this correlation was then modeled using the Bowtie method, fault trees, event trees, reliability theory, and the Monte Carlo model. The results show that it is possible to implement a structured model that can be easily put into practice. Using an illustrative case study, it is also possible to prioritize three companies according to their reputational risk as assessed by the proposed model. The developed model can promote the sustainability of collaborative networks in the logistics industry by assessing and consistently reducing reputational risk, thus supporting the strengthening of the relationship between suppliers, logistics service providers, and end customers.
45
Tušer, Irena, and Alena Oulehlová. "Risk Assessment and Sustainability of Wastewater Treatment Plant Operation." Sustainability 13, no. 9 (May 3, 2021): 5120. http://dx.doi.org/10.3390/su13095120.
Abstract:
Water and water management, which also includes wastewater treatment plants (WWTPs), are considered essential elements critical infrastructure. A disruption of their operation can result in the discharge of wastewater into the environment without having been adequately treated. This can cause health problems, contamination of soil, groundwater and surface water, etc. In order to provide operational safety and sustainability of WWTP operation, it is necessary to establish protection against potential risk activation, together with risk minimization and enhanced preparedness to address the risks. The article deals with the application of risk management stages on the selected object of the municipal WWTP facility in the form of a case study. The risk identification phase consisted of the identification of assets and risks. The assets were grouped together due to the complexity of the WWTP operation. A combination of methods, a safety audit, a checklist and semi-structured interviews were used to identify the risks in three iterations. A risk register was created as a result of the risk identification phase. Subsequently, a risk analysis was carried out, in which the scenarios of the risk impact on the assets were examined, the index levels of probability and impacts were determined, and the risk estimate was performed. The Bowtie Analysis Method was used to illustrate the causes and consequences for one of the critical risks. The result of the study is the risk evaluation identified undesirable and unacceptable risks for which risk management methods were proposed
46
Hamza Alsisi, Rayan, Arshad Karimbu Vallappil, and Hafiz Abdul Wajid. "A dual-band high gain complementary splitring resonator (CSRR) loaded hexagonal bowtie antenna with enhanced bandwidth for Vehicleto- Vehicle (V2V) communication applications." International journal of electrical and computer engineering systems 13, no. 10 (December 21, 2022): 839–48. http://dx.doi.org/10.32985/ijeces.13.10.1.
Abstract:
A highly reliable and efficient communication system is needed for a vehicle to navigate and drive to the destination without human control (known as an autonomous or self-driving vehicle). In this work, we consider various parameters for the antenna design, ensuring reliable communication amongst vehicles and infrastructure. Specifically, we consider the type of antenna, the method used, operating frequency, substrate type (with thickness and permittivity), size and shape, gain, and bandwidth. An optimal threshold value or range of these parameters is identified. Moreover, a complementary split-ring resonator (CSRR) metamaterial (MTM) based hexagonal bowtie antenna for a high gain V2V communication environment is presented. This antenna covers sub- 6 GHz fifth generation (5G) bands (3.15-3.95 GHz) and Wi-Fi band 2.4GHz. Printing was done on a low-cost FR4 substrate for the radiating patch. Antenna Bandwidth is enhanced using a partial ground plane. The radiating layer is based on hexagonal patches printed on the double side of the substrate, and the CSSR structure is etched from patches to enrich antenna gain and bandwidth. More importantly, the proposed CSRR employed antenna provides gain and bandwidth of 1.6dBi / 6 dBi and 100MHz/ 8000MHz at 2.4GHz /3.5GHz, respectively. A highly known software, CST microwave studio, simulates the proposed antenna. Simulated and measured results make this arrangement a potential candidate for 5G high gain V2V communication.
47
Naghavi, Amir H., Hamid R. Hassani, and Daniel Oloumi. "Improving the Probability of Stroke Detection inside the Human Head Using Wideband Polarimetric Synthetic Aperture Radar Imaging." International Journal of RF and Microwave Computer-Aided Engineering 2023 (March 16, 2023): 1–9. http://dx.doi.org/10.1155/2023/5644220.
Abstract:
This paper presents an imaging system based on ultrawideband microwave radars for the detection of bleeding regions and strokes inside the human head. The proposed system is portable and focuses on revealing bleeding areas with unpredictable shapes using polarimetric data acquisition. A custom-designed dual-polarized bowtie patch antenna capable of pumping the UWB pulses inside the patient’s head is designed and presented as the biomedical sensor for the system. The antenna dimensions are 25 × 25 m m 2 . It mitigates the mismatch between the air and skin needles of any coupling liquid, resulting in safe SAR levels below 0.5 W/kg and wideband operating bandwidth that covers 1.2-4.5 GHz with unidirectional radiations. To collect the raw polarimetric data, an elliptical array of the proposed antenna is formed around the patient’s head model that includes 16 elements in direct contact with the phantom. The performance of the proposed method is validated through an imaging scenario with two nonuniform bleeding areas inside the patient head model. The whole structure is simulated with a Gaussian pulse as the excitation using CST Microwave Studio tools. To produce 2D images of the voxel model, the time-domain elliptical synthetic aperture radar (ESAR) imaging algorithm is applied. Accurately detecting the presence and shape of anomalies in reconstructed images using the proposed method demonstrates the efficiency of the proposed system and determines its advantages over single-polarization systems.
48
Kwon, Taejoon. "Benchmarking Transcriptome Quantification Methods for Duplicated Genes in Xenopus laevis." Cytogenetic and Genome Research 145, no. 3-4 (2015): 253–64. http://dx.doi.org/10.1159/000431386.
Abstract:
Xenopus is an important model organism for the study of genome duplication in vertebrates. With the full genome sequence of diploid Xenopus tropicalis available, and that of allotetraploid X. laevis close to being finished, we will be able to expand our understanding of how duplicated genes have evolved. One of the key features in the study of the functional consequence of gene duplication is how their expression patterns vary across different conditions, and RNA-seq seems to have enough resolution to discriminate the expression of highly similar duplicated genes. However, most of the current RNA-seq analysis methods were not designed to study samples with duplicate genes such as in X. laevis. Here, various computational methods to quantify gene expression in RNA-seq data were evaluated, using 2 independent X. laevis egg RNA-seq datasets and 2 reference databases for duplicated genes. The fact that RNA-seq can measure expression levels of similar duplicated genes was confirmed, but long paired-end reads are more informative than short single-end reads to discriminate duplicated genes. Also, it was found that bowtie, one of the most popular mappers in RNA-seq analysis, reports significantly smaller numbers of unique hits according to a mapping quality score compared to other mappers tested (BWA, GSNAP, STAR). Calculated from unique hits based on a mapping quality score, both expression levels and the expression ratio of duplicated genes can be estimated consistently among biological replicates, demonstrating that this method can successfully discriminate the expression of each copy of a duplicated gene pair. This comprehensive evaluation will be a useful guideline for studying gene expression of organisms with genome duplication using RNA-seq in the future.
49
Samanta, Soumitra, Steve O’Hagan, Neil Swainston, Timothy J. Roberts, and Douglas B. Kell. "VAE-Sim: A Novel Molecular Similarity Measure Based on a Variational Autoencoder." Molecules 25, no. 15 (July 29, 2020): 3446. http://dx.doi.org/10.3390/molecules25153446.
Abstract:
Molecular similarity is an elusive but core “unsupervised” cheminformatics concept, yet different “fingerprint” encodings of molecular structures return very different similarity values, even when using the same similarity metric. Each encoding may be of value when applied to other problems with objective or target functions, implying that a priori none are “better” than the others, nor than encoding-free metrics such as maximum common substructure (MCSS). We here introduce a novel approach to molecular similarity, in the form of a variational autoencoder (VAE). This learns the joint distribution p(z|x) where z is a latent vector and x are the (same) input/output data. It takes the form of a “bowtie”-shaped artificial neural network. In the middle is a “bottleneck layer” or latent vector in which inputs are transformed into, and represented as, a vector of numbers (encoding), with a reverse process (decoding) seeking to return the SMILES string that was the input. We train a VAE on over six million druglike molecules and natural products (including over one million in the final holdout set). The VAE vector distances provide a rapid and novel metric for molecular similarity that is both easily and rapidly calculated. We describe the method and its application to a typical similarity problem in cheminformatics.
50
Morris, Victoria, Y. Zhou, R. Yun, J. Thompson, B. Khan, B. Bolling, SC Weaver, and AL Routh. "224 Ends of Endemics: Capturing Viral UTRs in Clinically Relevant Arbovirus Samples." Journal of Clinical and Translational Science 6, s1 (April 2022): 36. http://dx.doi.org/10.1017/cts.2022.122.
Abstract:
OBJECTIVES/GOALS: Whole-genome viral sequencing is vital to inform public health and study evolution. Arboviruses evolve in vectors, reservoir hosts, and humans, and require surveillance at all points. We developed a new rigorous method of sequencing that captures whole viral genomes in field-collected and clinical samples. METHODS/STUDY POPULATION: ClickSeq is a novel method of Next Generation Sequencing (NGS) library synthesis using azido-nucleotides to terminate reverse transcription. The cDNA generated can be ligated to sequencing and indexing primers at room temperature using copper (Cu I) and vitamin C. With this approach, we designed primers located ~250 bp apart along the genomes of the arboviruses Chikungunya 37797, Zika Dakar, Yellow Fever Asibi, Dengue serotype 2, West Nile 385-99, and St. Louis Encephalitis Virus (SLEV) clade II. We tested this method with varying viral titers: lab-infected mosquito pools, field-collected mosquito pools from a Texas West Nile and SLEV outbreak, and patient isolates from a Pakistani CHIKV outbreak. The cDNA was sequenced in the UTMB NGS Core and aligned using bowtie. RESULTS/ANTICIPATED RESULTS: The use of a single protocol to capture whole viral genomes including UTRs for multiple viruses from different sample collection styles is ideal for arboviruses. Primers for multiple viruses were pooled and used to sequence mosquito pools. The Tiled ClickSeq method captured whole viral genomes without the need for host depletion. UTRs were captured even when the viral strain used for primer design differed from the resulting strain. Discreet variants were captured in both the hypervariable nsP3 region and the UTR in the patient isolates from the CHIKV outbreak compared to the 2017 outbreak. Texas WNV and SLEV outbreaks are now defined from the 2020 outbreak and can be further tracked to update public health measures and understand viral evolution. DISCUSSION/SIGNIFICANCE: UTRs impact both human and mosquito fitness, leading to further outbreaks. Tiled ClickSeq aims to capture whole viral genomes with a method and cost that can be implemented by public health researchers to understand disease evolution as it happens to update both public health and basic virology to the effects of evolution on arboviruses.