Investigating the histological and structural properties of tendon gel as an artificial biomaterial using the film model method in rabbits

Purpose This study aimed to evaluate the properties of tendon gel by investigating the histological and structural differences among tendon gels under different preservation periods using a rabbit model. Methods Forty mature female rabbits were divided into four groups, each containing ten rabbits, on the basis of in-vivo preservation periods of tendon gels (3, 5, 10, and 15 days). We created the Achilles tendon rupture models using the film model method to obtain tendon gels. Tensile stress was applied to the tendon gel to promote maturation. Histological and structural evaluations of the tendon gel were performed before and after applying the tensile force, and the results obtained from the four groups were compared. Results Although the day-3 and day-5 tendon gels before applying tensile stress were histologically more immature than the day-10 and day-15 gels, type I collagen fibers equivalent to those of normal tendons were observed in all groups after the tensile process. Based on the surface and molecular structural evaluations, the day-3 tendon gels after the tensile process were molecularly cross-linked, and thick collagen fibers similar to those present in normal tendons were observed. Structural maturation observed in the day-3 tendon gels caused by traction was hardly observed in the day-5, -10, and -15 tendon gels. Conclusions The day-3 tendon gel had the highest regenerative potential to become a normal tendon by applying a traction force.

Markov chain model probability of dry, wet of rainy wet weeks during moonson period over Andhra Pradesh

For agricultural planning, it is important to know the sequence of dry, wet periods. For this purpose a week period may be taken as the optimum length of time. The success or failure of crops particularly under rainfed conditions is closely linked with the rainfall patterns. In this study the Markov chain model method has been applied to know the probability of having a dry or a wet week and consecutive dry or wet periods of 2 or 3 weeks during monsoon period over Andhra Pradesh.

Design Model As a Means of Thinking in Architectural Practice and Theory of Renaissance

Состояние проблемы. Реконструкция исторической эволюции архитектурного проектирования сегодня становится актуальной необходимостью. Причины, условия, процессы формирования базовых представлений и методов, легших в основу проектного типа мышления и действия, до сих пор довольно мало изучены, особенно в критическом аспекте. Между тем немалая часть сегодняшних проблем и затруднений, как становится понятно, берет начало в эпохе зарождения профессионального проектного метода, в событиях Нового времени. Центром этого метода стало моделирование, вопросы эволюции которого рассмотрены в настоящей работе. Результаты. Рассмотрен этап становления проектирования в архитектурной деятельности в Ренессансе, прежде всего методологический вклад Л. Б. Альберти. Показана трансформация традиционного модельного способа зодческой работы в Раннем Возрождении, связанная с обособлением креативных действий, персонализацией замысла, изменениями в цеховых коммуникациях. Ремесленный способ работы зодчего вступает в профессиональную эру, что ведет к кардинальному изменению характера и места архитектурных моделей. Выводы. Требуется переосмысление, даже переоценка значения моделирования в эволюции проектирования: на место привычной картины безоблачного прогресса должна прийти критическая и проблематизирующая теория, дающая основания для инструментального отношения к моделированию как одному из методов, не лишенному недостатков. Statement of the problem. Reconstruction of the historical evolution of architectural designing is becoming an urgent need today. The reasons, conditions, processes for the formation of basic ideas and methods that formed the basis of the designing type of thinking and action are still quite poorly understood, especially in a critical aspect. Meanwhile, a considerable part of today's problems and difficulties, as it becomes clear, originates in the era of the emergence of the professional method of designing, in the events of the Modernity. The center of this method is modeling, the evolution of which is considered in this work. Result. The stage of development of design in architectural activity in the Renaissance is considered, most importantly, the methodological contribution of L. B. Alberti. The transformation of the traditional model method of architectural work in the Early Renaissance is shown associated with the isolation of creative actions, personalization of the concept, changes in craft's communications. The craftsman's way of working enters the professional era, which results in a radical change in the nature and place of architectural models. Conclusions. Rethinking, even a reassessment of the importance of modeling in the evolution of designing is required instead of the usual picture of cloudless progress, a critical and problematizing theory should come providing foundations for an instrumental attitude to modeling as one of the methods that is not devoid of shortcomings.

On Factors behind the Reasonable Failure Mode of Concrete-Filled Circular Steel Tubular Composite Frame

As the most basic structure, the concrete-filled steel tubular (CFST) frame has been widely used in various structures and systems. Compared with conventional reinforced concrete structures and steel structures, CFST structures in strong earthquake showcase more complicated strength and deformation behavior because there are many factors underlying the failure mode. Furthermore, according to the specifications at home and abroad, the corresponding design method to achieve reasonable failure modes for CFST structures has not been clarified. Based on a destructive test on steel beam-CFST plane frames under constant axial load and lateral load, the fiber mode method and solid element model method are adopted to simulate the failure process of the test frames. Based on finite element model simulations and tests, the fiber model method is proposed to carry out the pushover analysis on the CFST frame structures. The factors behind the reasonable failure mode of steel beam-concrete-filled circular steel tubular (CFCST) frame structures are analyzed. Furthermore, the law and influencing factors behind the ratio of flexural capacity of column to beam, the ratio of line stiffness of beam to column, and the ratio of axial compression on the deformation, bearing capacity, and failure modes of the structure are discussed. Some suggestions on the design of reasonable failure mode of steel beam-concrete-filled circular steel tubular (CFCST) frame structures are proposed.

Preface

The 1st International Conference on Physics Issues (ICoPIs2021) Universitas Tadulako, Palu, Indonesia 28 August 2021 The International Conference of Physics Issues (ICoPIs) is an international conference held by the Department of Physics Education, Faculty of Teacher Training and Education, Tadulako University. The 1st International Conference on Physics Issues (ICoPIs2021) was a virtual conference organized by the Department of Physics Education in the Faculty of Teacher Training and Eucation, Tadulako University on 28th August 2021. This conference covered a variety of works, including the works on 1) learning strategy, model, method, media and learning evaluation in physics education; 2) nanoscience and nanomaterials; 3) research result of physics; 4) strategy, model, method, media and evaluation in natural science education; and 5) general education. The conference offered extraordinary opportunities for educators, teachers, researchers, administrators and decision-makers to exchange and gain new insights on the ongoing research works and an opportunity to collaborate with like-minded researchers from across the world. Theme of the conference was “Bounce Back Better: Enhancing Innovative Thinking Through Independent Campus-Freedom to Learn (MBKM) during Pandemic Era”. This event took the theme of “bounce back better” as an attempt to be resilient during the current pandemic situation. This conference was a forum for discussing and gaining knowledge and ideas from educational practitioners and experts. Accordingly, we hope that through this information exchanges, we will be more prepared for unprecedented situations in the future. On behalf of the committee, we would like to thank the Chancellor of Universitas Tadulako, Dean of the Teacher Training and Education Faculty, Head of the Mathematics and Natural Sciences Department, advisory board, steering committee, all committee members, reviewers, presenters, and participants. Recognition should go to the ICoPIs2021 Team members who have all worked extremely hard for the details of important aspects of the conference programs and social activities. Special thanks are also given to the Proceedings of the IOP Conference. We, on behalf of the ICoPIs 2021 committee, would like to thank all parties for their participation in supporting this publication. We hope to see you all at the next conference. Kind regards Dr. Nurjannah, M.Pd. Chair of the ICoPIs 2021 List of Organizing Committee, Photographs are available in this pdf.

Identification of radiant source in an enclosure by reduced model

We propose an original method to recover from a few measurement points the integrity of the temperature field of a furnace heated by a radiant thermal source. The radiant thermal source is first identified via a low order reduced model based on based on AROMM (Amalgam Reduced Order Modal Model) method which preserves the integrity of the geometry. The minimization is performed via a trust-region reflective least squares algorithm implemented in MATLAB “lsqcurvefit” function. From that identified heat flux, the integrity of the thermal field is then recovered by direct simulation thanks to a reduced model of higher rank to have a better precision. The treated application is a complex titanium piece heated by two radiant panels placed in a furnace. With four measuring points, the temperature of the whole thermal scene is retrieved at all times with an average error around 1 K on the studied object.