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Based on an extensive literature review on passive building designs for tropical climates, seven energy-efficient building design principles for tropical climate areas were deduced. These are: 1. To orientate a building design in such a direction that it protects from excessive solar radiation; 2. To accommodate for indoor natural ventilation; 3. That it makes maximal use of indirect instead of direct natural light; 4, That it reduces the amount of heat transmission through the roof as much as possible by natural ventilation between roof and ceiling and by lowering the roof surface temperature; 5. By preventing the use of high thermal mass materials; 6. By reducing through the exterior walls as much as possible heat transmission by e.g., preventing direct sunlight on the external walls and applying reflective paints on the external walls and; 7. By creating outdoor and transition spaces such as balconies, terraces atriums and corridors. The insights from the literature review were used as input to conduct a field study to evaluate the practice of applying passive building design principles. To this end, for 626 buildings on the Caribbean island Curaçao, it was investigated to what extent the recommended passive design principles for tropical climates were actually applied. Based on the results of the field study, several recommendations are made to improve the practice of applying passive building principles.

Kenyan river basin governance underwent a pioneering reform in the Water Act of 2002, which established new community water-management institutions. This article focuses on community water projects in the Likii Water Resource Users Association in the Upper Ewaso Ng’iro River basin on Mount Kenya, and the extent to which their features are consistent with Ostrom’s design principles of natural resource management. Although the projects have developed solid institutional structures, pressures such as hydroclimatic change, population growth, and water inequality challenge their ability to manage their water resources. Institutional homogeneity across the different water projects and congruence with the design principles is not necessarily a positive factor. Strong differences in household water flows within and among the projects point to the disconnection between apparently successful institutions and their objectives, such as fair and equitable water allocation.

Ostrom’s Design Principles (DPs) are believed to be a set of the best practical guidance for governing natural resources, but applying the DP theory should consider the local context, especially the political context, which has been examined little so far. Using the Institutional Analysis and Development (IAD) framework as a conceptual and analytical lens, this paper examines the impact of authoritarian context on self-governance in China. Based on the results of Barnard’s test and Crisp-set Qualitative Comparative Analysis (csQCA), our comparative analysis of nine Water Users Association cases provides consistent evidence that supports the DP theory generally on all outcome dimensions. But self-governance under authoritarianism has unique characteristics and its operation depends on proper design of institutional configuration in accordance with context. Our analysis highlights the influence of resource intervention and leadership intervention. It sheds new insights for understanding the significant impacts of the authoritarian context on institutional design of common-pool resources.

Reconfigurable robots have the potential to perform complex tasks by adapting their morphology to different environments. However, designing optimal morphologies for these robots is challenging due to the large design space and the complex interactions between the robot and the environment. An in-house robot named Smorphi, having four holonomic mobile units connected with three hinge joints, is designed to maximize area coverage with its shape-changing features using transformation design principles (TDP). The reinforcement learning (RL) approach is used to identify the optimal morphologies out of a vast combination of hinge angles for a given task by maximizing a reward signal that reflects the robot’s performance. The proposed approach involves three steps: (i) Modeling the Smorphi design space with a Markov decision process (MDP) for sequential decision-making; (ii) a footprint-based complete coverage path planner to compute coverage and path length metrics for various Smorphi morphologies; and (iii) pptimizing policies through proximal policy optimization (PPO) and asynchronous advantage actor–critic (A3C) reinforcement learning techniques, resulting in the generation of energy-efficient, optimal Smorphi robot configurations by maximizing rewards. The proposed approach is applied and validated using two different environment maps, and the results are also compared with the suboptimal random shapes along with the Pareto front solutions using NSGA-II. The study contributes to the field of reconfigurable robots by providing a systematic approach for generating optimal morphologies that can improve the performance of reconfigurable robots in a variety of tasks.

The sharp increase in the price and production of quinoa between 1990 and 2014 has had important impacts in Bolivia’s southern Altiplano region, previously considered one of the poorest regions in the country. The socio-economic status of most inhabitants improved significantly as a result of the “quinoa boom”. However, it also caused severe disturbances in socio-ecological systems and posed challenges to resource governance by traditional indigenous institutions. This article focuses on the role of farmer cooperatives, in particular, and examines how their production rules may have mitigated some of the challenges associated with the quinoa boom. We assess the activities of cooperatives with the help of Elinor Ostrom’s Institutional Analysis and Development (IAD) framework and analytic tools such as the ADICO grammar (Attribute, Deontic, aIm, Condition, Or else) and the eight design principles. The key production rules of cooperatives are examined and compliance with these rules is estimated based on semi-structured interviews and a survey conducted with quinoa producers (n=305). We argue that the cooperatives successfully contributed to alleviate pressures on resources in a context where traditional authorities were challenged by new tasks associated with land grabbing and the crowding out of diversified agricultural activities. In conclusion, we argue that collaboration between traditional authorities and farmer cooperatives holds great potential for improving the governance and sustainability of socio-ecological systems in the region.

This essay derives a schema for specifying design principles for information technology-based artifacts in sociotechnical systems. Design principles are used to specify design knowledge in an accessible form, but there is wide variation and lack of precision across views regarding their formulation. This variation is a sign of important issues that should be addressed, including a lack of attention to human actors and levels of complexity as well as differing views on causality, on the nature of the mechanisms used to achieve goals, and on the need for justificatory knowledge. The new schema includes the well-recognized elements of design principles, including goals in a specific context and the mechanisms to achieve the goal. In addition, the schema allows: (1) consideration of the varying roles of the human actors involved and the utility of design principles, (2) attending to the complexity of IT-based artifacts through decomposition, (3) distinction of the types of causation (i.e., deterministic versus probabilistic), (4) a variety of mechanisms in achieving aims, and (5) the optional definition of justificatory knowledge underlying the design principles. We illustrate the utility of the proposed schema by applying it to examples of published research.

High altitude rangeland and livelihood systems in Bhutan are undergoing changes in resource availability, population and user rights. This paper explores the existing governance structures of high altitude rangelands in Bhutan using Ostrom’s design principles as a framework for analysis. Qualitative interviews and focus group discussions were used to capture perceptions of 151 herders, sedentary livestock farmers and government officials across three case study sites. The research showed that most high altitude rangelands in the three case study sites have clear boundaries using natural and manmade landmarks along with a list of eligible users (design principle 1). Herders and livestock farmers have developed customary norms and rules to enforce and engender collective choice agreements for governance of high altitude rangeland (design principle 3). Community guards, appointed on a rotational basis, guarded communal pastures against infringement (design principle 4). Herders and livestock farmers have developed a graduated penalty system (design principle 5) and they were generally able to resolve most conflicts locally, however some were resolved through district courts (design principle 6). However, rights to organise (design principle 7) and a nested enterprise approach (design principle 8) did not feature explicitly in local governance discourses and narratives. Incongruence between provision and appropriation activities under existing governance structures of high altitude rangeland in the case study sites may be attributed to the assignment of incomplete property rights (e.g. lack of management rights) in the bundle of rights. The research demonstrated assigning management rights in the bundle of rights and conformance to design principle 2 are inextricably linked, and vital for sustainable governance of high altitude rangeland. One way to institutionalise Ostrom’s design principles into natural resource governance is formalising and codifying them in the form of a written group constitution and by-laws. The role of government policies, acts and laws that inform and constrain high altitude rangeland management are explored and changes suggested for improving the current governance system of high altitude rangeland in Bhutan.

As finfish fisheries increasingly shrink due to overexploitation, management and industry have shifted their attention to the world’s squid fisheries. The emergence of squid fisheries in the global seafood market calls for well-designed and effective management strategies if they are to remain viable. This study assesses the efficacy of squid governance from a social-ecological perspective in three fisheries. This analysis uses an evidence-based approach to characterize the social-ecological system variables that contribute to each fishery management system meeting its stated goals. To do so, I test the hypothesis that the presence of the ten institutional design principles formulated by common pool resource theory leads to more effective squid fishery management. I measure five outcome variables (governance system effect, commons condition trend, basin switch, user group well-being, compliance) to assess governance effectiveness from social and ecological perspectives. This is the first attempt to examine the design principles and operationalize Ostrom’s Social-Ecological System framework to compare globally competitive squid fisheries. Results indicate that each of the three analyzed squid governance systems has met its specified management goals and is associated with positive social and ecological outcomes. Using the Socio-Ecological Systems Meta-Analysis Database (SESMAD), I used secondary data supplemented with semi-structured interviews with key informants to find a strong presence of the design principles in each case. Findings suggest effective squid governance is associated with user-involvement in system operations and contextually appropriate policies, rather than a single overarching squid based strategy.

Although broadly admired for its aesthetic qualities, the art of origami is now being recognized also as a framework for mechanical metamaterial design. Working with the Miura-ori tessellation, we find that each unit cell of this crease pattern is mechanically bistable, and by switching between states, the compressive modulus of the overall structure can be rationally and reversibly tuned. By virtue of their interactions, these mechanically stable lattice defects also lead to emergent crystallographic structures such as vacancies, dislocations, and grain boundaries. Each of these structures comes from an arrangement of reversible folds, highlighting a connection between mechanical metamaterials and programmable matter. Given origami's scale-free geometric character, this framework for metamaterial design can be directly transferred to milli-, micro-, and nanometer-size systems.

After four decades of research and development on language in mathematics classrooms, there is consensus that enhancing language is crucial for promoting students’ mathematics learning. After briefly sketching the theoretical contexts for work on this topic, in this paper we present six design principles for instruction that enhances language for mathematics learning. We then review the research that provides an empirical foundation for these principles, (a) concerning the design of learning environments to enhance language for mathematics learning and (b) on teaching practices (including teacher moves and classroom norms) involved in the enactment of those designed learning environments. Without claiming completeness, this review of the state of development and research shows that some aspects of design and instruction that enhance language for mathematics learning have been well researched, whereas research gaps for other aspects persist.