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Статті в журналах з теми "Open Rigid Barriers"
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Choy, Yat Sze, Wang Zhibo, and Yang Waiping. "Noise reduction of Parallel barrier integrated with compact flexible panel device." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 3 (August 1, 2021): 2961–72. http://dx.doi.org/10.3397/in-2021-2268.
Повний текст джерелаАнотація:
Erection of parallel barriers to control environmental noise such as traffic noise and construction noise is commonly seen in community. Owing to the formation of multiple reflection waves between the parallel barriers, their performance may be worse than a single barrier. To improve the performance of parallel barriers, a small piece of flush-mounted panels backed by a slender cavity in an otherwise rigid wall of barriers is proposed. With the excitation of the incident wave from a sound source inside parallel barriers, the flexible panel vibrates and sound is radiated out to undergo acoustics interference with sound field between the parallel barriers so that the sound intensity in this space and diffraction wave at the barrier top edge is reduced over a broadband in the low-frequency regime. The use of the panel provides flexibility in controlling range of stopband with high insertion loss by varying mass and bending stiffness. A semi-analytical model for dealing with vibroacoustic coupling between the open cavity and vibrating panel in a two-dimensional configuration is established in order to understand the sound suppression mechanism within the shadow zone. With the optimal structural properties of the panel, the extra averaged insertion loss of about 5dB in the frequencies ranging from 50 to 1000 Hz is reached for the parallel barrier.
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GUPTA, SHUCHI, KEYA DHARAMVIR, and V. K. JINDAL. "STRUCTURE AND DYNAMICS OF CARBON NANOTUBES IN CONTACT WITH GRAPHITE SURFACE AND OTHER CONCENTRIC NANOTUBES." International Journal of Modern Physics B 18, no. 07 (March 20, 2004): 1021–41. http://dx.doi.org/10.1142/s0217979204024513.
Повний текст джерелаАнотація:
Rigid carbon nanotubes in single and double walled formations, placed on a graphite surface, are bounced, rotated, slid and rolled. Various features associated with these motions are studied by assuming a 6-exp form of interaction (Van der Waal's attraction and Born–Mayer repulsion) among the C-atoms. Calculations reported here are for tubes of diameter around 14 Å, for which rigid tube approximation is known to work well. The oscillatory motion corresponding to rolling has the softest mode, whereas the one with highest frequency corresponds to bouncing. The energy barriers corresponding to these motions are also reported in this paper. The rotational and translational energy barriers for the movement of one nanotube with respect to the other one, in a double walled nanotube, have also been studied and it turns out that these tubes rotate and slide freely at room temperature. The translational energy barrier, in case of zigzag tubes, is interestingly, an order of magnitude higher than that of armchair tubes. In case of rotation, the case is reverse. Furthermore, it turns out that any drag of a concentric nanotube along the long axis direction is coupled with rotation, indicating easy screw motion instead of a simple drag. We also describe the dynamics of translational telescopic motion of a multiwalled nanotube assembly where a core oscillates within an open ended outer shell assembly.
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Marchelli, Maddalena, and Valerio De Biagi. "Dynamic effects induced by the impact of debris flows on protection barriers." International Journal of Protective Structures 10, no. 1 (September 12, 2018): 116–31. http://dx.doi.org/10.1177/2041419618798378.
Повний текст джерелаАнотація:
Debris flow is a transient phenomenon that causes large disasters. Retaining systems, whose design is still nowadays a crucial issue, can mitigate this risk. Multiple surges can arise during this phenomenon; thus, an accurate analysis might consider the impact force time histories rather than only its maxima. The aim of this work is to analyze the effects of the interaction between the debris and the barrier during one surging phenomenon. A discrete element model models the granular motion and the interaction between the debris and a rigid open barrier set at the end of the channel. The estimated interaction force time history is then used as input impact force for the dynamic structural analyses of the piles. A total of 12 different structural sections are adopted and the internal forces at the base are critically compared. It results that the first mode vibration period is the parameter that largely affects the behavior of the piles.
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Joshy, Nixon, Kamini Prakash, and Komal Ramdey. "Social Taboos and Menstrual Practices in the Pindar Valley." Indian Journal of Gender Studies 26, no. 1-2 (February 2019): 79–95. http://dx.doi.org/10.1177/0971521518811171.
Повний текст джерелаАнотація:
Menstruating women in remote villages of the Himalayas still practise segregation due to the belief that menstrual blood is impure. They are confined to the cowshed ( goth) and are not allowed to interact with others. Although Bageshwar district has been declared as open defecation free and every household has a toilet, menstruating women continue to defecate in the open because they are not allowed to use sanitation facilities used by others. Menstrual taboos have an impact on the mobility, health, education and self-esteem of women and adolescent girls. This article looks at the taboos that exist in the Pindar Valley and how women and adolescent girls cope when they have their period. What is the impact of these taboos on the women and girls? How do men and women perceive these taboos? What are the key barriers to changing these practices? How have women negotiated this change given the rigid traditions that have been handed down the centuries?
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Reid, John D., Ronald K. Faller, Jim C. Holloway, John R. Rohde, and Dean L. Sicking. "New Energy-Absorbing High-Speed Safety Barrier." Transportation Research Record: Journal of the Transportation Research Board 1851, no. 1 (January 2003): 53–64. http://dx.doi.org/10.3141/1851-06.
Повний текст джерелаАнотація:
For many years, containment for errant racing vehicles traveling on oval speedways has been provided through rigid, concrete containment walls placed around the exterior of the track. However, accident experience has shown that serious injuries and fatalities may occur through vehicular impacts into these nondeformable barriers. Because of these injuries, the Indy Racing League and the Indianapolis Motor Speedway, later joined by the National Association for Stock Car Auto Racing (NASCAR), sponsored the development of a new barrier system by the Midwest Roadside Safety Facility at the University of Nebraska–Lincoln to improve the safety of drivers participating in automobile racing events. Several barrier prototypes were investigated and evaluated using both static and dynamic component testing, computer simulation modeling with LS-DYNA (a nonlinear finite element analysis code), and 20 full-scale vehicle crash tests. The full-scale crash testing program included bogie vehicles, small cars, and a full-size sedan, as well as Indy Racing League open-wheeled cars and NASCAR Winston Cup cars. A combination steel tube skin and foam energy-absorbing barrier system, referred to as the SAFER (steel and foam energy reduction) barrier, was successfully developed. Subsequently, the SAFER barrier was installed at the Indianapolis Motor Speedway in advance of the running of the 2002 Indianapolis 500 race. From the results of the laboratory testing program as well as analysis of the accidents into the SAFER barrier occurring during practice, qualification, and the race, the SAFER barrier has been shown to provide improved safety for drivers impacting the outer walls.
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Mokibelo, Eureka. "Communication Challenges in the Military Institution." International Journal of Language and Literary Studies 1, no. 3 (January 6, 2020): 138–51. http://dx.doi.org/10.36892/ijlls.v1i3.89.
Повний текст джерелаАнотація:
This paper examines communication challenges within the military institution in Botswana. There seems to be rigid ways of delivering messages which in the end impede smooth communication practices between senior personnel and their subordinates within the institution. This study adopted the qualitative analysis to interrogate issues underlying communication practices from military classrooms for three years. The target group was middle ranking officers in institution who take Communication and Study Skills course as a requirement for their study at the University of Botswana. Data were collected using open ended questionnaires, interviews and group discussions in the classrooms. The model of communication process and new media were used to benchmark the practices within the institution against what the concepts say. The findings indicated that indeed communication processes were marred with problems that hinder smooth transition of messages from the sender to the receiver and ended up frustrating the subordinates. The study concluded that revamping and sanitizing communication practices within the military institution was necessary through educating the leadership to address the barriers encountered.
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SINGH, JASDEEP KAUR DARSAN, NURZATIL SHARLEEZA MAT JALALUDDIN, NEETI SANAN-MISHRA, and JENNIFER ANN HARIKRISHNA. "CHALLENGES TO THE ADOPTION OF MODERN CROP BIOTECHNOLOGY: INSIGHTS FROM INDIAN AND MALAYSIAN GM REGULATORY FRAMEWORKS." Malaysian Applied Biology 49, no. 5 (December 31, 2020): 1–9. http://dx.doi.org/10.55230/mabjournal.v49i5.1632.
Повний текст джерелаАнотація:
The emerging use of genetic engineering technology led to the establishment of the Cartagena Protocol on Biosafety in 2001. India and Malaysia are signatories to the Protocol, having established regulatory measures governing the use of biotechnological genetic modification including regulation of genetically engineered crops from research to open cultivation and post-market surveillance. India and Malaysia have developed biosafety policies that display some similarities but also many differences, consequently impacting the practicalities of applying the technology to development and deployment of new crop varieties. The objective of this paper is to compare biosafety policies and regulatory frameworks that India and Malaysia have in place for the use of modern biotechnology. We highlight the implications of imposing rigid requirements as well as lacking harmonized policies on the approval process and trade flows, identifying these as potential barriers to the optimal use of modern crop biotechnology. We also briefly discuss how current interpretations of Living Modified Organisms and Genetically Modified Organisms in India and Malaysia will influence the pace of crops developed from new plant breeding techniques and propose options to regulate these technologies based on experience from other countries.
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Ridlo, Aflakhur. "Analisis Kelembagaan dalam Monitoring Kualitas Air Sungai Ciliwung di Wilayah Provinsi DKI Jakarta." Jurnal Wacana Kinerja: Kajian Praktis-Akademis Kinerja dan Administrasi Pelayanan Publik 20, no. 2 (May 7, 2018): 89. http://dx.doi.org/10.31845/jwk.v20i2.23.
Повний текст джерелаАнотація:
Institutional research and policy analysis of water quality monitoring of the Ciliwung River has been conducted since the year 2015. This activity is the result of cooperation between the Ministry of Environment and Forestry of Indonesia and the Agency for Assessment and Application of Technology. Due to the complexity of the Ciliwung River flows and water quality problem that passed the administrative authority of DKI Jakarta, the methodology of this study was emphasized in depth interviews to stakeholders in the management of the Ciliwung River. The plan to install some online system of river water quality monitoring is expected to run well and in accordance with existing laws and regulations. In addition, the readiness of the operationalization of this monitoring system to run well. Institutional strengthening forms and open method of coordination can be adopted to reduce communication and coordination barriers that are rigid and Weberian. From this study it is concluded that Jakarta Environmental Management Agency is the strongest candidate as one of the managers of online monitoring system of Ciliwung river water quality. Institutionally public intervention on river management in general can suppress water quality pollution which can threat n the health of people living around Jakarta area. Online Mortitoring system can be utilized by preparing a reliable institutional arrangements
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Vlahović, Ana. "Challenges to the Implementation of a New Framework for Safeguarding Financial Stability." Journal of Central Banking Theory and Practice 3, no. 3 (September 1, 2014): 19–52. http://dx.doi.org/10.2478/jcbtp-2014-0014.
Повний текст джерелаАнотація:
Abstract There is probably no single economic concept that has attracted more attention and intrigued scientific and professional circles than financial stability. For over a decade now that have been efforts to establish the starting point in explaining this condition or characteristic of the financial system since some find that the key to defining financial stability lies in stability and others argue in favour of the opposite, instability. Unfortunately, no agreement has been reached on a universal definition that would be widely accepted at the international level. Consequently, this gave rise to open discussions on systemic risk, creating a framework for preserving financial stability, and the role of central banks in this process. This article analyses the results achieved in the development of a theoretical concept of financial stability and its practical implementation. A consensus has been reached on the necessity of removing rigid barriers between macro and prudential policies and on the necessity of their coordinated actions. The primary objectives of monetary and fiscal stability have been shifted towards preserving financial stability. The isolated macroprudential principle rightfully got the epithet of an archaic approach. Coordinated micro and macroprudential policies have definitely prevailed and become reality in many countries, including Montenegro. Created institutional frameworks for safeguarding financial stability at all levels - national, Pan-European and global - represent a challenge for further comparative studies.
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Battisti, Enrico, Fabio Creta, and Nicola Miglietta. "Equity crowdfunding and regulation: implications for the real estate sector in Italy." Journal of Financial Regulation and Compliance 28, no. 3 (January 10, 2020): 353–68. http://dx.doi.org/10.1108/jfrc-08-2018-0109.
Повний текст джерелаАнотація:
Purpose This paper gathers initial evidence about the nature and features of the equity crowdfunding model in Italy, especially in terms of regulations. The purpose of this study is to examine how equity crowdfunding might support the real estate sector in Italy. Design/methodology/approach To explore the recent initiatives in the development of FinTech in Italy, especially referring to equity crowdfunding’s instrument, a qualitative perspective is used. In particular, this paper relies on primary data from regulations and secondary data from the public domain, which are examined in relation to the current literature. Findings The results of this study show that equity crowdfunding represents a funding method that is rapidly increasing in Italy, despite rather rigid regulation. Among the various sectors involved, the real estate sector could benefit from the crowdfunding models and, specifically, from the equity one. The development of new real estate equity crowdfunding portals that allow diversification of investment (by reducing the typical entry barriers for real estate investment) could guarantee greater investment transparency and simplicity. Practical implications Real estate crowdfunding can be a simple way to invest in the real estate industry. Thanks to the use of technology, specifically internet-based platforms, this type of crowdfunding allows for small investors, as well as professional investors, to access an asset class otherwise not open to small investment tickets and improve the diversification of investments. Originality/value Although recent literature has examined the concept of crowdfunding and highlighted different models, aspects and campaigns, no prior studies, to the authors’ knowledge, have explicitly and jointly investigated, also based on the state of art of regulation, the equity crowdfunding model and the real estate sector in Italy.
Частини книг з теми "Open Rigid Barriers"
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van der Laan, Luke, and Liz Neary. "Equity and Access as Keys for Opening Open Learning." In Open Learning and Formal Credentialing in Higher Education, 263–90. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-8856-8.ch014.
Повний текст джерелаАнотація:
This chapter adopts a critical perspective of how open education (OE), based on the principles of equity and access, aligns with the mega-drivers of contemporary higher education. These include key drivers of OE such as lifelong learning, self-directed career development and credentialing. The process of synthesising learning, work and transition within what is described as the ‘conceptual age' of work, is daunting to the majority of members of the workforce globally. A combination of regulation, academic dogma underpinning traditional university models and rigid assumptions as to the nature of knowledge frustrate the promotion of OE. This case study explores a work-based learning (WBL) university program designed to broaden access and equity to universities within the context of mega-drivers shaping higher education demand. The model complements rather than competes with traditional university offerings and represents a pragmatic response to the barriers to participation and OE principles.
Тези доповідей конференцій з теми "Open Rigid Barriers"
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Baumer, Timothy, Mark A. Rapo, Jessica M. Wong, Brian J. Powell, Brett D. Juhas, Philemon C. Chan, and James F. MacKiewicz. "Blast Overpressure Measured on a Bare vs. Helmeted Rigid Headform." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63260.
Повний текст джерелаАнотація:
There is significant concern that blast overpressure can cause mild traumatic brain injury (mTBI). An accurate understanding of the blast flow and overpressure event as well as it’s interaction with the head and helmet system is a necessary first step in establishing loading conditions to the head. It also provides a means for model validation and other predictive capabilities. A custom-designed Blast Overpressure Bust (BOB) containing 22 surface pressure sensors was rigidly mounted in a live-fire blast event. The blast field tests were conducted in an open field using 4 lbs. of cylindrical C4 charges suspended 48″ above the pad. The BOB was mounted to a torso surrogate and positioned 92″ from the hanging charge. The BOB was oriented at blast impact angles of 0 (front-facing), 45, 90, and 180 degrees. The BOB was tested in both bare and helmeted configurations. Data recorded across a bare headform at each angle established a baseline for the pressure trace at each sensor location. Two helmeted cases were investigated: Advanced Combat Helmet (ACH) with the sling suspension system and ACH with Team Wendy pads. Results showed peak pressures on exposed surfaces normal to the blast were ∼1200kPa with side-on pressures of ∼400kPa. The addition of a helmet did not alter the peak normal pressures, but showed slight to moderate increases in pressure beneath the helmet based on the amount of cushioning present. The sling suspension, which leaves an open gap between the head and helmet, resulted in several recorded amplification points beneath the helmet with the peaks reaching ∼800kPa. The Team Wendy pads trials, which effectively fill the gap between the head and helmet, showed amplifications with peaks of ∼500kPa. An additional set of tests was conducted using an ingress barrier positioned between the head and helmet at the brim. Results showed pressures under the helmet that were lower than the bare headform trials. While it was shown that adding a helmet did in fact increase pressures relative to the bare headform case, these amplifications were still far less than the peak pressure exerted on the exposed surfaces of the headform. The data presented herein is the most robust data set to date for pressures exerted on a helmeted headform and is considered applicable to the first 3–5ms of an unconstrained system, during which time motion is minimal.
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Patel, Harshkumar, and Saeed Salehi. "Comparative Evaluation of Elastomer Seal Energization in Conventional and Expandable Hanger Assembly." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96776.
Повний текст джерелаАнотація:
Abstract Elastomer seals are extensively used in various wellhead and casing/liner hanger equipment as barriers for isolating fluids. Seal assemblies have been identified as one of the major cause of well control incidents. Majority of hangers utilize conventional weight- or mechanical-set slip-and-seal assembly. The objective of this paper is to conduct detailed investigation of seal energization in conventional and relatively newer expandable type hanger seal assembly. To achieve the objective, finite element modeling approach was employed. Three dimensional computer models consisting of concentric casings and annular elastomer seal element were constructed. Seal energization process was modelled by manipulating boundary conditions. Conventional seal energization was mimicked by applying rigid support at the bottom of elastomer element and compressing it from the top. Expandable hanger type seal energization was modelled by radially displacing the inner pipe to compress annular seal element. Seal quality was evaluated in terms of contact stress values and profile along the seal-pipe interface. Different amount of seal energization were simulated. Both types of seal energization processes yielded different contact stress profiles. For the same amount of seal volumetric compression, contact stress profiles were compared. In case of conventional seal energization, contact stress profile decreases from the compression side towards support side. The seal in expandable hanger generates contact stress profile that peaks at the center of contact interface and reduces towards the ends. Convectional seal assembly has more moving parts, making it more prone to failure or under-energization. FEA Models were validated using analytical equations. Good match was obtained. Majority of research related to elastomer seal is focused on material properties evaluation. Limited information is available in public domain on functional design and assessment of seal assembly. This paper adds novel information by providing detailed assessment of advantages and limitations of two different seal energization process. This opens doors for further research in functional failure modes in seal assembly.