Safe design of a thermally unstable solid storage container: Natural convection effects on thermal ignition

A numerical simulation of the convection process in a thermally unstable solid storage container has been carried out. The obtained results show that natural convection shifts the thermal ignition to higher induction times. Beyond a critical Rayleigh number, natural convection can prevent the system against thermal ignition. Temperature and velocity fields are calculated. The influence of the dependence of Biot numbers on temperature and the radius/height ratios on the induction times for thermal ignition has been also examined.     

Is There A “New” Internal Rate of Return Literature?

Recent writing in various real estate journals appears to have become interested in an issue which a number of other journals have treated previously. Specifically, the concept known as the internal rate of return (IRR) has been examined extensively by the literatures of business finance, management science, and economic theory. This paper surveys and reviews the literature by problem, journal and date. The paper concludes that this demonstration suggests the necessity of an understanding of literature in related disciplines as well as our own.     

A note on “minimizing a weighted quadratic function of job lateness in the single machine system”

A set of jobs is to be scheduled on a single machine where an idle time is allowed to be inserted before the processing of the first job begins. The objective is to find an optimal sequence that minimizes the weighted sum of a quadratic function of job lateness. Sen et al. [Sen, T., Dileepan, P., Lind, M.R., 1995. Minimizing a weighted quadratic function of job lateness in the single machine system. International Journal of Production Economics 42(3), 237–243] presented a branch-and-bound algorithm for the problem; however, as shown in this note, their algorithm does not work because the branching rule for adjacent jobs is not applicable to non-adjacent jobs.     

A Study of the Performativity of the “Ambidextrous Organizations” Theory: Neither Lost in nor Lost before Translation

Ambidextrous organizations succeed both in incremental and discontinuous innovation. However, there is little direct empirical evidence on how managers implement the principles of the “ambidextrous organizations” theory to dynamically align the structure and culture of ambidextrous organizations. Our study does not focus on analyzing the factors that give rise to organizational ambidexterity but focuses on analyzing whether the factors suggested by prior theorizing on “ambidextrous organizations” are implemented by managers in their daily practice as suggested by prior theorizing. Accordingly, this study does not investigate the traditionally conceptualized gap between academic theorizing and managerial practice since “ambidextrous organizations” theory can be characterized as rigorous and relevant. We investigate whether the “ambidextrous organizations” theory is implemented as suggested by prior theorizing and whether successful implementation is subject to managing in the way that scholars' prior theorizing suggests. Based on qualitative and quantitative data from two longitudinal case studies, we find that managers overlooked the process dimension in evaluating the required degree of ambidexterity. Furthermore, the organizational structure and culture for incremental innovation did not differ from the structure and culture for discontinuous innovation alongside the expected dimensions. Finally, the discontinuous innovation business unit had to be reintegrated to ensure sustained growth. During the reintegration processes, organizational capabilities mutated. We linked our findings on the processes and performativity of ambidextrous organizing to extant theories and developed the rationale for the observed novel phenomena of innovation myopia, second‐order competency traps, and capability mutations.     

“To Own or Not to Own?” A Study on the Determinants and Consequences of Alternative Intellectual Property Rights Arrangements in Crowdsourcing for Innovation Contests

Firms are increasingly engaging in crowdsourcing for innovation to access new knowledge beyond their boundaries; however, scholars are no closer to understanding what guides seeker firms in deciding the level at which to acquire rights from solvers and the effect that this decision has on the performance of crowdsourcing contests. Integrating property rights theory and the problem‐solving perspective while leveraging exploratory interviews and observations, we build a theoretical framework to examine how specific attributes of the technical problem broadcast by firms affect the seekers’ choice between alternative intellectual property rights (IPR) arrangements that call for acquiring or licensing‐in IPR from external solvers (i.e., with high and low degrees of ownership, respectively). Each technical problem differs in the knowledge required to be solved as well as in the stage of development of the innovation process and seeker firms pay great attention to such characteristics when deciding about the IPR arrangement they choose for their contests. In addition, we analyze how this choice between acquiring and licensing‐in IPR, in turn, influences the performance of the contest. We empirically test our hypotheses analyzing a unique dataset of 729 challenges broadcast on the InnoCentive platform from 2010 to 2016. Our results indicate that challenges related to technical problems in later stages of the innovation process are positively related to the seekers’ preference toward IPR arrangements with a high level of ownership, while technical problems involving a higher number of knowledge domains are not. Moreover, we found that IPR arrangements with a high level of ownership negatively affect solvers’ participation and that IPR arrangement play a mediating role between the attributes of the technical problem and the solvers’ self‐selection process. Our paper contributes to the open innovation and crowdsourcing literature and provides practical implications for both managers and contest organizers.     

光纤布拉格光栅(FBG)温度传感器增敏封装技术

介绍了光纤布拉格光栅(FBG)传感器测温的基本原理和封装方法,提出了一种新型的FBG温度传感器的封装技术,包括封装结构的设计及封装材料的合理选择,目的是提高FBG的温度敏感系数和消除应力的交叉影响。通过实验对裸光纤和封装后的光纤的温度特性、应力影响等进行了对比,结果表明:采用此法封装后的FBG对温度具有很好的线性度和重复性,基本上消除了应力的影响,可以准确监测温度,测温范围为-15~200℃,精度达到±0.05℃。     

Teledemocracy from the top

Teledemocracy, the use of new communications and information technology to widen the scope of the public's political participation, is a hot topic. Over the past few years a number of wide-scale teledemocratic experiments have taken place, for example in New Zealand, the State of Washington, and Hawaii, and the idea is being increasingly discussed in the scholarly as well as popular literature.¹ The reasoning behind, and justification for, teledemocracy has been expounded before.² This Comment, however, attacks the problem from a new perspective - where do politicians fit into such a system, and why should they nurture its development?     

火电厂锅炉微油点火技术的经济性分析

针对火电厂锅炉启动点火及低负荷助燃工况下耗油量大的问题,介绍了微油点火技术的特点及其在锅炉改造中的应用,对锅炉启动、低负荷运行的经济性进行计算和分析。通过分析可以看出,微油点火技术在火电厂锅炉上应用有很好的经济效益。     

Thermal stability and deflagration of ethylene oxide

Some initiating causes of ethylene oxide decomposition are examined. Experimental data are presented for thermal decomposition limits, autoignition temperature and minimum ignition energy. It is shown that flame propagation through liquid filled lines may occur via decomposition of a vapor pocket. Insulation fires are discussed in terms of a series of exothermic reactions initiated by low tempertaure formation of polyethylene glycols. Some case histories are reviewed.     

Perceptions of Industrial Design: The “Means” and the “Ends”

It is widely accepted that industrial design can play an important role in the development of innovative products, but integrating design‐thinking into new product development (NPD) is a challenge. This is because industrial designers have very different perspectives and goals than the other members of the NPD team, and this can lead to tensions. It has been postulated that the communications between NPD managers and industrial designers are made more difficult because each group uses very different language. This research made the first empirical investigation of the language used by designers and managers in describing “good” and “poor” industrial design. In‐depth interviews were conducted with a sample of 19 managers and industrial designers at five leading companies. Multiple sources of data were utilized, including the repertory grid technique to elicit the key attributes of design, from the perspective of managers and designers. Using a robust, systematic coding approach to maximize the validity and reliability of qualitative data analysis, it was established that managers and industrial designers do not use a completely different vocabulary as previously supposed. Rather, it was found that managers and industrial designers use some common terms augmented by additional terms that are specific to each group: managers are commercially orientated in the “ends” they want to achieve and designers perceive more antecedents (“means”) necessary to achieve their “ends”—iconic design. This research led to a grounded conceptual model of the role of design, as perceived by managers and industrial designers. The implications of the results achieved are wide: they indicate how managers and designers can interact more productively during NPD; they highlight the need for more research on the language of designers and managers; and they point to issues that need to be covered in the education of industrial designers. Finally, this work suggests how managers and designers can engage in a more fruitful dialogue that will help to make NPD more productive.     

太阳能热发电用双层壁蓄热单元数值模拟

利用FLUENT软件中的凝固/熔化模型,对采用双层壁圆筒内填充相变材料(PCM)蓄热的太阳能热发电高温相变蓄热单元的蓄热过程进行了数值模拟研究,在保证蓄热量的前提下,得到了在第3类边界条件下不同管径蓄热单元内相变材料熔化过程中温度和液相率曲线及液相率的分布云图,并对结果进行了分析,掌握了太阳能热发电高温相变蓄热单元相变过程的规律,为太阳能热发电高温相变蓄热器的优化设计提供了重要参考价值和理论依据。     

Context matters: Diversity's short‐ and long‐term effects in fortune's “best companies to work for”

Research summary: Previous research has examined the racial diversity‐productivity relationship in corporations with an evident high commitment to minority programs, Fortune's “Best Companies for Minorities.” To assess generalizability, we replicate this research using a different context of high organizational‐employee value congruence, Fortune's “Best Companies to Work For.” We are not able to find evidence for the curvilinear relationships previously found, but do uncover a linear negative relationship between racial diversity and short‐run performance. Managerial summary: Using Fortune's “Best Companies for Minorities,” previous research found that racial diversity affected both firm productivity and Tobin's q. To see if we could find these results in a different group of firms, we replicate this research using a sample drawn from Fortune's “Best Companies to Work For.” The former sample is distinguished by high commitment to minority programs, while the one used here stresses high congruence of values between the organization and all its employees. We are unable to replicate the relationships previously found, however, but do find that increasing racial diversity had a negative effect on firm productivity. Copyright © 2016 John Wiley & Sons, Ltd.     

Strategy tools‐in‐use: A framework for understanding “technologies of rationality” in practice

In response to critiques of strategy tools as unhelpful or potentially dangerous for organizations, we suggest casting a sociological eye on how tools are actually mobilized by strategy makers. In conceptualizing strategy tools as tools‐in‐use, we offer a framework for examining the ways that the affordances of strategy tools and the agency of strategy makers interact to shape how and when tools are selected and applied. Further, rather than evaluating the correct or incorrect use of tools, we highlight the variety of outcomes that result, not just for organizations but also for the tools and the individuals who use them. We illustrate this framework with a vignette and propose an agenda and methodological approaches for further scholarship on the use of strategy tools. Copyright © 2014 John Wiley & Sons, Ltd.     

Entry and Prices: Evidence from the Supermarket Sector

The purpose of this paper is to investigate the effect on prices of the entry of a large supermarket into a given location. We use a panel with data from fifteen cities in Chile for the period 1998:I–2004:IV. We correct for the potential simultaneity problem derived from the fact that entry can be a response to price differentials. We find that the entry of a hypermarket to a given city reduces relative prices in that local market by 7–11%. Most interestingly, we also find that part of this effect takes place the year before the supermarket actually opens for business.      

“Am I Getting It or Not?” The Practices Involved in “Trying to Consume” a New Technology

In recent years, high rates of failure of technology‐based products have spurred interest in understanding the psychological and sociological barriers to consumer learning of technological innovations. The main focus of this research was to examine the learning process and consumers’ coping mechanisms when they encounter technological innovations. A study was designed to understand the learning process in real time as consumers engaged in a set of activities associated with the novel interface. The goal was to investigate how consumers cope with high levels of complexity during their initial interactions with a technology‐based product and how their coping strategies may hinder the learning process. Verbal protocol measures were used in order to understand the consumer's learning process as he or she interacts with a technology‐based product in real time. They were told that they would have to think aloud while performing certain tasks and that their thoughts would be recorded for further analysis. The personal digital assistant (PDA) with handwriting recognition as its interface was chosen for this study. The main task for the participants was to learn how to use Graffiti writing—i.e., the product's handwriting recognition software. We proceeded to a thematic analysis in which interpretations were generated by the researchers going back and forth between the transcribed texts, the developing interpretation, the new interface itself, and also the relevant literature. The results suggest that the new product's interface serves to structure the consumer's learning process even as he or she responds in relatively unstructured ways. The findings identify three basic factors that interfere with the learning process during consumers’ initial interactions with a technological innovation: interface and functionality practices, social influence, and causal attributions. Specifically, the results suggest that in designing technology‐based products there is a gap between the levels of know‐how between the manufacturer and the user. The challenge for manufacturers is to understand the consumer's learning experience and coping strategies and provide mechanisms that would make the transition easy and intuitive. This could be achieved by incorporating into the new interface some degree of flexibility that will allow consumers to modify tasks based on their preferences, or by including indicators that will provide feedback to the user. Furthermore, in the context of communication strategies, in order to minimize the negative impact that prior knowledge and social influence may have on learning, marketers could communicate specific steps describing how to use the new interface.     

Shared knowledge, “glitches,” and product development performance

Much recent thought in strategy has stressed the importance of organizational integration for competitive advantage. Empirical studies of product development have supported this emphasis by correlating integrating practices and superior performance. We propose, from a resource‐based or capability view, that this correlation results from integration leading to patterns of shared knowledge among firm members, with the shared knowledge constituting a resource underlying product development capability. To explore this connection, we examine the product development efforts of a scientific software company. We define the ‘glitch’ as a costly error possible only because knowledge was not shared, and measure the influence of glitches on firm performance. At this company, gaps in shared knowledge did cause the company to incur significant excess costs. We also identify a set of ‘syndromes’ that can lead to glitches, and measure the relative importance of these syndromes. The glitch concept may offer a general tool for practical measurement of the marginal benefits of shared knowledge. Copyright © 1999 John Wiley & Sons, Ltd.     

Why strategic factor markets matter: “New” multinationals' geographic diversification and firm profitability

This study examines firm profitability differences among “new” multinational enterprises (NMNEs) pursuing geographic diversification into two distinct types of geographic locations based on the development of strategic factor markets. Building on strategic factor markets theory, we propose that firm‐specific advantages of NMNEs contribute differentially to firm profitability because they evolve differently given strategic factor market differences in host compared to home countries. Using a sample of Korean manufacturing MNEs during the 1993–2003 period, we find that geographic diversification into resource‐poorer host countries has a positive relationship with firm profitability, whereas geographic diversification into resource‐richer host countries has a U‐shaped relationship with firm profitability. Our study demonstrates why strategic factor markets—an important and often overlooked contextual factor—matter in exploring rationales for geographic diversification. Copyright © 2014 John Wiley & Sons, Ltd.     

Modified Stage‐Gate® Regimes in New Product Development*

The purpose of this research was to explore the nature of the Stage‐Gate^®process in the context of innovative projects that not only vary in new product technology (i.e., radical versus incremental technology) but that also involve significant new product development technology (i.e., new virtual teaming hardware‐software systems). Results indicate that firms modify their formal development regimes to improve the efficiency of this process while not significantly sacrificing product novelty (i.e., the degree to which new technology is incorporated in the new offering). Four hypotheses were developed and probed using 72 automotive engineering managers involved in supervision of the new product development process. There was substantial evidence to creatively replicate results from previous benchmarking studies; for example, 48.6% of respondents say their companies used a traditional Stage‐Gate^®process, and 60% of these new products were considered to be a commercial success. About a third of respondents said their companies are now using a modified Stage‐Gate^®process for new product development. Auto companies that have modified their Stage‐Gate^®procedures are also significantly more likely to report (1) use of virtual teams; (2) adoption of collaborative and virtual new product development software supporting tools; (3) having formalized strategies in place specifically to guide the new product development process; and (4) having adopted structured processes used to guide the new product development process. It was found that the most significant difference in use of phases or gates in the new product development process with radical new technology occurs when informal and formal phasing processes are compared, with normal Stage‐Gate^®usage scoring highest for technology departures in new products. Modified Stage‐Gate^®had a significant, indirect impact on organizational effectiveness. These findings, taken together, suggest companies optimize trade‐offs between cost and quality after they graduate from more typical stage‐process management to modified regimes. Implications for future research and management of this challenging process are discussed. In general, it was found that the long‐standing goal of 50% reduction in product development time without sacrificing other development goals (e.g., quality, novelty) is finally within practical reach of many firms. Innovative firms are not just those with new products but also those that can modify their formal development process to accelerate change.     

Explosive decomposition of ethylene oxide

The purpose of this work was to obtain data on explosive limits for ethylene oxide (EtO) in nitrogen beyond the published data range. Tests were conducted at temperatures from 60°-190°C and pressures in the range 10 to 80 psig. Initial measurements showed that the limits for the EtO/N₂ system are unusually dependent on the details of the ignition source. Hot wire ignition gave very erratic responses. Induction coil sparks were not satisfactory due to inadequate energy and uncertain gap breakdown at elevated pressure. However, high-energy capacitive discharge across an exploding bridge element tuned to the ignitive process gave responses that were reproducible and judged to be true and conservative. Graphite filament was used as the exploding bridge “wire” to avoid contamination of the test mixture. (Carbon is a product of EtO explosions.) The data from this study show the EtO explosive range becomes wider with increasing pressure at the low end of the temperature range examined than previously understood from literature data. At modest pressures, the directly-measured limits at elevated temperature agree with extrapolations of earlier reported data. Because of the pressure nonlinearity, the system is deemed safer at 80 psig and high temperature than had been predicted from the linear treatment.     

Response to Vuori and Vuori's commentary on “Heuristics in the strategy context”

We recently introduced a research program on how firms can effectively capture fleeting opportunities using heuristics. Heuristics, we advocate, are the essence of strategy, especially in unpredictable markets where opportunities are often numerous, fast moving, and uncertain. Our emphasis on heuristics invites comparison with prominent research programs in cognitive psychology. We address this opportunity by comparing our “simple rules” heuristics approach with “heuristics‐and‐biases” and “fast‐and‐frugal” heuristics research. Collectively, the three approaches offer a rich understanding of heuristics. Copyright © 2014 John Wiley & Sons, Ltd.