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The US central government enactment of the 1866 Post Roads Act preempted state and municipal telegraph franchise entry barriers. Like present-day telecommunication companies, local franchise regulations were an entry barrier to US telegraph companies. These pre-1866 state and municipal telegraph laws were barriers of both entry and trade between states. Barriers that would of reduced the benefits of a common market if the barriers had not been preempted by the 1866 Post Roads Act. I document what laws were preempted by the 1866 Post Roads Act, explain how these laws increased entry barriers, provide evidence that preemption was enforced, and use two counterfactuals to calculate rough estimates of the decrease in entry costs from enforcement of the act.

THE main working documents for an inspector are specifications and drawings. Among criticisms made at the Natural Rubber Producers' Research Association symposium last year, was that there are too many specifications and I think most of us would agree. However, I think we could improve this situation considerably as far as materials are concerned, if we accepted and really worked in accordance with the fundamental principle laid down in Av.P.970 Chap. 400. This can be summarised as: ‘Specifications for critical materials need approval by D.Mat/Aviation — non‐critical materials do not need such approval’. A rider is added to the effect that non‐critical materials do not need to be inspected to such tightly drawn specifications as critical materials and in some instances commercial quality materials may be used. If one can decide therefore, which materials are critical and which are not, and this is by no means easy, we can simplify inspection procedures and possibly reduce the number of specifications. Obviously critical applications will always call for special quality specifications but it is wasteful to use such materials where they are not necessary. One docs, however, notice a tendency among specification writers to over specify and to classify specifications too highly, i.e. to seek special approval when it is not necessary. It is our view that A.I.D. supervision should be concentrated on critical materials and components and that comparatively little effort should be devoted to non‐critical items, this being left to the purchaser who would probably order standard engineering materials or even commercial quality.

The following address has been sent to the President of the French Republic :—

Create and share a MATLAB library that performs data augmentation algorithms for audio data. This study aims to help machine learning researchers to improve their models using the algorithms proposed by the authors.

The authors structured our library into methods to augment raw audio data and spectrograms. In the paper, the authors describe the structure of the library and give a brief explanation of how every function works. The authors then perform experiments to show that the library is effective.

The authors prove that the library is efficient using a competitive dataset. The authors try multiple data augmentation approaches proposed by them and show that they improve the performance.

A MATLAB library specifically designed for data augmentation was not available before. The authors are the first to provide an efficient and parallel implementation of a large number of algorithms.

The number of people with special needs, including citizens and military personnel, has increased as a result of terrorist attacks and challenging conditions in Iraq and other countries. With almost 80% of the world’s amputees having below-the-knee amputations, Iraq has become a global leader in the population of amputees. Important components found in lower limb prostheses include the socket, pylon (shank), prosthetic foot and connections.

There are two types of prosthetic feet: articulated and nonarticulated. The solid ankle cushion heel foot is the nonarticulated foot that is most frequently used. The goal of this study is to use a composite filament to create a revolutionary prosthetic foot that will last longer, have better dorsiflexion and be more stable and comfortable for the user. The current study, in addition to pure polylactic acid (PLA) filament, 3D prints test items using a variety of composite filaments, such as PLA/wood, PLA/carbon fiber and PLA/marble, to accomplish this goal. The experimental step entails mechanical testing of the samples, which includes tensile testing and hardness evaluation, and material characterization by scanning electron microscopy-energy dispersive spectrometer analysis. The study also presents a novel design for the nonarticulated foot that was produced with SOLIDWORKS and put through ANSYS analysis. Three types of feet are produced using PLA, PLA/marble and carbon-covered PLA/marble materials. Furthermore, the manufactured prosthetic foot undergoes testing for dorsiflexion and fatigue.

The findings reveal that the newly designed prosthetic foot using carbon fiber-covered PLA/marble material surpasses the PLA and PLA/marble foot in terms of performance, cost-effectiveness and weight.

To the best of the author’s knowledge, this is the first study to use composite filaments not previously used, such as PLA/wood, PLA/carbon fiber and PLA/marble, to design and produce a new prosthetic foot with a longer lifespan, improved dorsiflexion, greater stability and enhanced comfort for the patient. Beside the experimental work, a numerical technique specifically the finite element method, is used to assess the mechanical behavior of the newly designed foot structure.

The purpose of this paper is to evaluate the mechanical properties of photopolymer/CB (carbon black) nanocomposite when applied in a visible-light rapid prototyping (RP) machine.

The mechanical properties of the samples such as hardness and tensile strength along with thermal stability were analyzed. The curing time behavior of the photopolymer/CB nanocomposites was tested by using a rigid-body pendulum rheometer. The shrinkage property and dimensional stability were also analyzed using the technique according to ASTM D2566 and ASTM D1204, respectively.

The results showed that the prototype fabricated from pristine photopolymer tended to exhibit poor mechanical properties and low thermal stability. However, after adding the photopolymer with various concentrations of nano-CB and dispersant in appropriate composition, the photopolymer/CB nanocomposite prototype not only reduced its curing time but also enhanced its mechanical properties, thermal stability and dimensional stability.

The presented results can be used in a visible-light RP machine.

The mechanical and thermal properties of photopolymer are improved with nano-CB additives for a RP system.

This narrative inquiry examines teachers' influences on undergraduate/graduate students who enrolled in STEM programs and intended to enter STEM careers. Three National Science Foundation (NSF) scholarship grants sat in the backdrop. Narrative exemplars were crafted using the interpretative tools of broadening, burrowing, storying and restorying, fictionalization, and serial interpretation. Three diverse students' narratives constituted the science education cases: one from teacher education, another about cybertechnology, and a third involving cybersecurity. The influence of the university students' former teachers cohered around five themes: (1) same program-different narratives, (2) in loco parentis, (3) counterstories, (4) learning in small moments, and (5) the importance of the liberal arts in STEM education. The students' narratives form instructive models for their siblings and other students pursuing STEM degrees/careers. Most importantly, the multiperspectival stories of experiences capture the far-reaching impact of “unsung teachers” whose long-term influence is greatly underestimated by the public.

In this interview, Dr. Nancy J. Adler describes her career trajectory, motivation, and the passion that have guided her interests and choices. Asking big questions that matter in her own research and encouraging others in the field of international management to do the same is one of her guiding principles. Dr. Adler details the startling career impact that resulted from her pioneering research on women who are global leaders in the 1990s. Given her groundbreaking research, her attempts to influence what scholars study and how they are evaluated, and her calls to action as a global consultant, speaker, and thought leader, she is one of academe's most well-known and respected global leaders.

Dr. Adler is the S. Bronfman Professor Emerita in Management at McGill University in Montreal, Canada. She is a graduate of the University of California at Los Angeles (UCLA), having received her BA in Economics, MBA, and PhD in Management. As one of the most widely cited international management scholars, she has authored more than 175 publications and received numerous teaching and research awards, including the Academy of Management's (AMLE) Outstanding Article Award and Decade Award and the Sage Award for Scholarly Contributions in Management. She is a Fellow of the Academy of International Business, the Academy of Management, and the International Academy of Management. In addition, she was honored as one of Canada's top university professors and inducted into the Royal Society of Canada.

Her work has also been widely recognized beyond academia. She received the Prix du Quebec, Doctor Honoris Causa from Slovenia's IEDC Bled, Queen Elizabeth II Diamond Jubilee Medal, Center for Creative Leadership's Applied Research Award, the World Federation of People Management Associations' Georges Petitpas Award, ASTD's International Leadership Award, SIETAR's Outstanding Senior Interculturalist Award, the International Leadership Association's Lifetime Achievement Award, and the YWCA's Femme de Mérite Award.

Although retired from the university setting after 40 years at McGill, Dr. Adler continues to consult and speak around the world. However, she now devotes more time to her art. She is a visual artist known for her paintings, monotype prints, and ceramic artworks. Her “Serendipity Suite” and “Reality in Translation: Art Transforming Apathy into Action” exhibitions were held at the Banff Centre, and her “Going Beyond the Dehydrated Language of Management” exhibition opened in Montreal in conjunction with the Academy of Management Meeting. Dr. Adler's artwork is held in private collections worldwide.

Relationships between long-distance exchange, especially of luxury goods, and the centralization of political power represent a fundamental dimension of political and economic organization. Precolumbian American societies, outside familiar European contexts that have shaped analytical perspectives, provide a broadened comparative field with the potential for more nuanced analysis.

Analysis focuses on four cases that vary in political centralization, institutional complexity, and geographic scale: Ulúa societies without political centralization; small Maya states; Aztec; and Inka empires. Emphasis on relationships between principals and agents highlights the potential of social practices to perform the functions often associated with state institutions

In the Ulúa region, commerce flourished in the absence of states and their concomitants. The very wealth of Ulúa societies and the unusually broad dispersion of prosperity across social segments impeded the development of states by limiting the ability of local lords to intensify their status and convert it to political power. Intensity of market activity and long-distance exchange does not correlate well with the florescence of states. Less centralized and non-centralized political systems may in fact facilitate mercantile activity (or impede it less) in comparison with states.

These cases frame a useful perspective on the organizational configuration of long-distance trade. Informal social mechanisms and practices can be an alternative to state institutions in structuring complex economic relations. The implications for understanding trajectories of societal change are clear: the development of states and centralized political organization is not a prerequisite for robust long-distance commerce.

THIS number will appear at the beginning of the Leeds Conference. Although there is no evidence that the attendance will surpass the record attendance registered at the Birmingham Conference, there is every reason to believe that the attendance at Leeds will be very large. The year is one of importance in the history of the city, for it has marked the 300th anniversary of its charter. We hope that some of the festival spirit will survive into the week of the Conference. As a contributor has suggested on another page, we hope that all librarians who attend will do so with the determination to make the Conference one of the friendliest possible character. It has occasionally been pointed out that as the Association grows older it is liable to become more stilted and formal; that institutions and people become standardized and less dynamic. This, if it were true, would be a great pity.