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1 |
A pressure- or velocity-dependent acceleration rate law for the shock-to-detonation transition process in PBX 9502 high explosive
قانون میزان شتاب فشار یا وابسته به سرعت برای روند انتقال شوک به انفجار در مواد منفجره PBX 9502-2020 Shock-to-detonation transition profiles of PBX 9502 explosive are analyzed to develop a rate law for shock acceleration. The shock motion profiles are seen to follow a common trend in the shock acceleration–velocity frame, aside from an early time transient that is dependent on the initiating shock strength. The duration of the early time transient is seen to correlate with the initial shock strength. The com- mon shock acceleration profile is seen to be Arrhenius-like with respect to the local particle velocity or pressure. A dual-rate pressure-dependent Arrhenius-type rate law is developed with the duration of the early rate set by the initial shock strength. The rate law is able to predict the shock motion for all tests well in both particle velocity and pressure space. In addition to directly measuring commonalities in the acceleration profiles of the experimental shock motion, this work provides insight into the functional form of the reaction rate laws for this TATB-based high explosive. The rate law also supports the concept that shock-driven reaction in heterogenous high explosives is driven by localized ignition and growth of hotspots. Keywords: Detonation | Shock-to-detonation | transition SDT | Detonation reaction rate | High explosive |
مقاله انگلیسی |
2 |
The future is in the past: A framework for the Marketing-Entrepreneurship Interface (MEI)
آینده در گذشته است: چارچوبی برای رابط بازاریابی-کارآفرینی (MEI)-2020 In this article, we review milestones in the 30+ year history of conceptualizations of the Marketing- Entrepreneurship Interface (MEI) in order to develop an overdue unified framework. This framework finally achieves the original mission of the “Charleston Summit” - to create a research framework for the MEI. We update the 4-perspectives view proposed by Hansen and Eggers (2010). In particular, we retain the first per- spective, which is the commonalities between the domains of marketing and entrepreneurship, as is. In updating the perspectives, we define the fourth perspective as entrepreneurial and SME marketing and we combine the second and third perspectives into a single framework. We review some major concepts within the two domains and provide numerous suggestions for future research that emerge from the framework. Our conceptualization of the MEI creates a vast array of research possibilities for MEI scholars old and new. Keywords: Marketing – Entrepreneurship Interface | MEI history | MEI models/frameworks | MEI domain |
مقاله انگلیسی |
3 |
Identification of drivers, benefits, and challenges of ISO 50001 through case study content analysis
شناسایی درایورها ، مزایا و چالشهای ISO 50001 از طریق تجزیه و تحلیل محتوای موردی-2020 An expanding body of research is defining drivers, benefits, and challenges of adopting ISO 50001 energy
management systems. The Clean Energy Ministerial’s Energy Management Leadership Awards program requires
ISO 50001-certified organizations to develop case studies of their implementation experience. 72 recent case
studies spanning multiple economic sectors provide a unique global look at implementation from certified organizations’
perspectives. This dataset was investigated through content analysis of phrases related to motivations
and goals, the role of management and the organization, benefits achieved, keys to success, and challenges.
This paper presents findings from this quantitative analysis of “codes” assigned to phrases that capture their
meaning. While organizations adopted ISO 50001 for different motives and saw myriad benefits beyond energy
savings and associated greenhouse gas emissions reductions, commonalities exist. The most frequently identified
drivers are existing values and goals, environmental sustainability, and government incentives or regulations.
Findings also include: obtaining and sustaining top management support is critical; top benefits mentioned are
cost savings, productivity, and operational improvements; and the primary barrier is lacking a culture of energy
management. Policymakers and others looking to accelerate ISO 50001 uptake can use these findings to highlight
benefits and incentives that will resonate with corporate decisionmakers worldwide Keywords: Energy management | ISO 50001 | Content analysis | Energy savings | Greenhouse gas emissions |
مقاله انگلیسی |
4 |
Bringing an entrepreneurial focus to sustainability education: A teaching framework based on content analysis
ایجاد تمرکز کارآفرینی بر آموزش پایداری: چارچوبی برای آموزش مبتنی بر تحلیل محتوا-2020 Research on sustainability education has neglected to integrate entrepreneurial skills into other relevant competences such as foresight, complex problem-solving, and interdisciplinarity. Previous research highlights possible convergences between sustainability education and entrepreneurship education; however, it does not address how to achieve this integration in practice. To address the gap between the literature and practice, this paper tackles the question: How can entrepreneurial competences be taught in sustainability education programs in higher education? We introduce a teaching framework based on a bibliometric method that combines topic-modeling with a content-analysis of selected articles. The focus of the analysis is the commonalities of both educational fields. Our results introduce a program for entrepreneurial-oriented sustainability education, providing a description of the educational focus, teaching-learning approaches, main themes, and external collaboration. The framework proposes educational for sustainable development across educational programs while implicitly addressing complex community problems through the development of solutions that can change the ways business and consumers relate with sustainability issues. These results contribute to the sustainability education literature by integrating the development of entrepreneurship competences into interdisciplinary pro- grams. The framework could also be used as a practical guide for designing courses, at both the undergraduate and graduate level, that integrate both sustainability and entrepreneurship.© 2019 Elsevier Ltd. All rights reserved.
Keywords: Bibliometric | Sustainability education | Entrepreneurship education | Sustainable development goals | Teaching framework | Higher education |
مقاله انگلیسی |
5 |
Piecing together a puzzle—A review and research agenda on internationalization and the promise of exaptation
درهم آمیختن یک پازل - یک برنامه بررسی و تحقیق در مورد بین المللی سازی و وعده آزادی-2020 The development of wings on dinosaurs is an example of a discontinuous developmental shift, an exaptation. This complements adaptive behaviour, and both are Darwinian concepts used in organizational behaviour theories. Organizational behaviour also forms the basis of internationalization theories, and exaptation has been suggested to provide a theoretical tool for understanding disruptive development in internationalization. Together with adaptation, the concept illustrates a joint framework for understanding both disruptive and non-disruptive development in internationalization. However, a systematic assessment of the theory’s potential is missing. This manuscript builds on the TCCM review protocol, illustrating the commonalities between research agendas in the internationalization process, and provides a starting point for subsequent theory development utilizing exaptation in predicting internationalization. Thus, the review contributes to the field of international business by offering a conceptual framework to combine internationalization theories by including non-linear, discontinuous and novel events more tightly to the existing foundations of internationalization. Keywords: Exaptation | Adaptation | Internationalization | Entrepreneurship | Organizational learning |
مقاله انگلیسی |
6 |
اهمیت تاثیرات تقویم در بازار برق
سال انتشار: 2019 - تعداد صفحات فایل pdf انگلیسی: 8 - تعداد صفحات فایل doc فارسی: 28 چگونگی هماهنگی عرضه و تقاضا تبدیل به یک سوال طولانی مدت در بازار برق شده است، و ناهنجاری های مرتبط با اشکالات تقویم عوامل بحرانی برای تخصیص منابع هستند. این مقاله یک روش ارزیابی اهمیت تمام تاثیرات ممکن در فرکانس های زمانی متفاوت معرفی میکند. ما روش تست خودمان را در بزرگ ترین پلت فرم معاملات برق در ایالات متحده پیاده سازی میکنیم. با استفاده از اطاعات معاملات روزانه فرکانس بالا، تاثیرات تقویم در فرکانس های زمانی متفاوت (روز-از-هفته، ساعت-از-روز، ماه-از-سال، روز-از-ماه و فصل) را ارزیابی میکنیم. نتایج ما وجود تاثیرات تقویم در هر بعد از فرکانس زمانی، و مخصوصا آن تاثیرات تقویم با اهمیت آماری را تایید می کند. علاوه بر آن، این مطالعه وجوه اشتراک بین بازارهای برق و بازار های پولی که امکان درخواست مدیریت بازار های پولی به بازار های برق را کشف میکند. در کنار آن، تاثیرات شناسایی شده تقویم الگو های دوره ای تعادل بازار و تسهیل پیاده سازی راه حل های فنی صحیح در بازار های برق را شرح میدهد.
کلید واژه ها: تاثیرات تقویم | بازار برق PJM | قیمت برق | نوسان قیمت |
مقاله ترجمه شده |
7 |
The future is in the past: A framework for the Marketing-Entrepreneurship Interface (MEI)
آینده در گذشته است: چارچوبی برای رابط بازاریابی و کارآفرینی (MEI)-2019 In this article, we review milestones in the 30+ year history of conceptualizations of the Marketing-
Entrepreneurship Interface (MEI) in order to develop an overdue unified framework. This framework finally
achieves the original mission of the “Charleston Summit” - to create a research framework for the MEI. We
update the 4-perspectives view proposed by Hansen and Eggers (2010). In particular, we retain the first perspective,
which is the commonalities between the domains of marketing and entrepreneurship, as is. In updating
the perspectives, we define the fourth perspective as entrepreneurial and SME marketing and we combine the
second and third perspectives into a single framework. We review some major concepts within the two domains
and provide numerous suggestions for future research that emerge from the framework. Our conceptualization of
the MEI creates a vast array of research possibilities for MEI scholars old and new. Keywords: Marketing – Entrepreneurship Interface | MEI history | MEI models/frameworks | MEI domain |
مقاله انگلیسی |
8 |
Enhanced digital chaotic maps based on bit reversal with applications in random bit generators
نقشه های دیجیتال آشوب آور بهبود یافته بر اساس معکوس کردن بیت با برنامه های کاربردی در ژنراتورهای بیت تصادفی-2019 Digital chaotic maps are becoming increasingly popular in the area of cryptography due to commonalities but have drawbacks which adversely effect security strength. Thus, enhanc- ing digital chaotic maps in terms of their chaoticity and statistical properties contributes towards the improvement of chaos-based cryptography. This paper proposes a bit rever- sal approach to address these issues. The proposed method modifies chaotic state values (represented as fixed point numbers) by reversing the order of their fractional bits. Exper- imental verification indicates that chaotic maps modified by the proposed approach depict better chaotic performance, have higher complexity and larger chaotic parameter range. These results exceed those of existing digital chaotic maps and other chaotification meth- ods. The simplicity of the proposed bit reversal approach and the use of fixed point rep- resentation makes it easy to implement on any computing platform. This approach is also highly flexible as it does not require any external inputs, making it a universal method for enhancing any digital chaotic map. As a proof-of-concept, a pseudorandom bit generator (PRBG) was designed based on cascading chaotic maps modified by the proposed method. Simulation and security analysis indicate that the proposed PRBG is statistically random, has a uniform data distribution and high key sensitivity. Keywords: Digital chaotic map| Logistic map | Henon map | Pseudorandom bit generator | Fixed point arithmetic | Chaotification |
مقاله انگلیسی |
9 |
Dealing with dealers: Sovereign CDS comovements
مواجهه با دلال ها: هم حرکتی های CDS حاکم-2018 We show that sovereign CDS that have common dealers tend to be more correlated, especially when the dealers display similar quoting activity in those contracts over time. This commonality in dealers’ activity is a powerful driver of CDS return comovements, over and above fundamental similarities between countries, including default, liquidity, and macro factors. We posit that the mechanism causing the excess correlation is the buying pressure faced by CDS dealers for credit enhancements and regulatory capital reliefs. An instrumental variable analysis helps alleviate the endogeneity concerns in our analysis
keywords: Sovereign CDS |Comovements |Commonalities |Dealers |
مقاله انگلیسی |
10 |
Mining data in a dynamic PRA framework
داده های معدن در یک چارچوب PRA پویا-2018 Computational, also known as Dynamic, Probabilistic Risk Assessment (PRA) methods employ system simulation
codes coupled with stochastic analysis tools in order to determine probabilities of certain outcomes such as
system failure. In contrast to Classical PRA methods (i.e., Event-Tree and Fault-Tree) in which timing and se
quencing of events is set by the analyst, accident progression is dictated by the system control logic and its
interaction with the system temporal evolution. Due to the nature of the problem, Dynamic PRA methods can be
expensive form a computational point of view since a large number of accident scenarios is simulated.
Consequently, they also generate a large amount of data (database storage may be on the order of gigabytes or
higher). We investigate and apply several methods and algorithms to analyze these large time-dependent data
sets. The objective is to present a broad overview of methods and algorithms that can be used to improve data
quality and to analyze and extract information from large data sets containing time dependent data. In this
context, “extracting information” means constructing input-output correlations, finding commonalities, and
identifying outliers.
Keywords: Data mining ، Dynamic PRA ، Probabilistic risk assessment ، Clustering |
مقاله انگلیسی |