Material characterization of structural adhesives in the lap shear mode

A general method for characterizing structual adhesives in the bonded lap shear mode is proposed. Two approaches in the form of semiempirical and theoretical approaches are used. The semiempirical approach includes Ludwik's and Zhurkov's equations to describe respectively, the failure stresses in the constant strain rate and constant stress loading modes with the inclusion of the temperature effects. The theoretical approach is used to describe adhesive shear stress-strain behavior with the use of viscoelastic or nonlinear elastic constitutive equations. Two different model adhesives are used in the single lap shear mode with titanium adherends. These adhesives (one of which was developed at NASA Langley Research Center) are currently considered by NASA for possible aerospace applications. Use of different model adhesives helps in assessment of the generality of the method

Spatial updating of objects after rotational and translational body movements in virtual environments

Cataloged from PDF version of article.Spatial reasoning in architectural design can be better understood by considering the factors that affect the spatial updating process of the individual in an environment. This study focuses on the issue of spatial updating of viewed and imagined objects after rotational and translational body movements in a virtual environment (VE). Rotational and translational movements based on an egocentric frame of reference where there is no control of the user are compared in a desktop VE. Moreover, preference in architectural drawing medium and gender are analyzed as the factors that affect the spatial updating of objects in each body movement type. The results indicated that translational movement was more efficient than the rotational movement in judgment of relative directions in viewed objects. Furthermore, the viewed objects were more correctly spatially updated than the imagined ones both in translational and rotational body movements. In comparison of hand, computer and both as the drawing media, findings indicated that preference in computer medium in architectural design drawings was an effective one in spatial updating process in a VE. Contrary to the previous studies, it is found that there was no significant difference between gender and movement types. © 2008 Elsevier Ltd. All rights reserved

An analysis of shoe within the context ofsocial history of fashion

Thesis (Master)--Izmir Institute of Technology, Industrial Design, Izmir, 2006Includes bibliographical references (leaves: 98-101)Text in English; Abstract: Turkish and Englishviii, 101 leavesThis research explores the many paradoxes inherent in shoes in collecting, consuming, fashioning, representing, and wearing them. It aims to capture the cultural significance of shoes in history, fashion, sociology, psychology, sexuality and dance

Curious Exploration via Structured World Models Yields Zero-Shot Object Manipulation

It has been a long-standing dream to design artificial agents that explore their environment efficiently via intrinsic motivation, similar to how children perform curious free play. Despite recent advances in intrinsically motivated reinforcement learning (RL), sample-efficient exploration in object manipulation scenarios remains a significant challenge as most of the relevant information lies in the sparse agent-object and object-object interactions. In this paper, we propose to use structured world models to incorporate relational inductive biases in the control loop to achieve sample-efficient and interaction-rich exploration in compositional multi-object environments. By planning for future novelty inside structured world models, our method generates free-play behavior that starts to interact with objects early on and develops more complex behavior over time. Instead of using models only to compute intrinsic rewards, as commonly done, our method showcases that the self-reinforcing cycle between good models and good exploration also opens up another avenue: zero-shot generalization to downstream tasks via model-based planning. After the entirely intrinsic task-agnostic exploration phase, our method solves challenging downstream tasks such as stacking, flipping, pick & place, and throwing that generalizes to unseen numbers and arrangements of objects without any additional training.Comment: NeurIPS 2022 camera-ready versio

The effects of molecular weight on the single lap shear creep and constant strain rate behavior of thermoplastic polyimidesulfone adhesive

The bonded shear creep and constant strain rate behaviors of zero, one, and three percent endcapped thermoplastic polyimidesulfone adhesive were examined at room and elevated temperatures. Endcapping was accomplished by the addition of phthalic anhydrides. The primary objective was to determine the effects of molecular weight on the mechanical properties of the adhesive. Viscoelastic and nonlinear elastic constitutive equations were utilized to model the adhesive. Ludwik's and Crochet's relations were used to describe the experimental failure data. The effects of molecular weight changes on the above mentioned mechanical behavior were assessed. The viscoelastic Chase-Goldsmith and elastic nonlinear relations gave a good fit to the experimental stress strain behavior. Crochet's relations based on Maxwell and Chase-Goldsmith models were fit to delayed failure data. Ludwik's equations revealed negligible rate dependence. Ultimate stress levels and the safe levels for creep stresses were found to decrease as molecular weight was reduced

Updating spatial orientation in virtual environments

Cataloged from PDF version of article.Spatial reasoning in architectural design can be better understood by considering the factors that are affecting the spatial updating of the individual in an environment. This study focuses on the issue of spatial updating during rotational and translational movements in a virtual environment (VE). Rotational and translational movements based on an egocentric frame of reference via optic flow are compared separately in order to find the movement that is more efficient in spatial updating. Alignment of the objects with the viewer, different media utilized in architectural design drawings and gender are considered as factors that affect the spatial updating within the movement types. The results indicated that translational movement was more efficient in the judgment of relative directions. Furthermore, questions related to the objects that were aligned with the viewer were more correctly answered than on the misaligned ones. In comparison of hand, computer and both as drawing media, findings indicated that computer usage in architectural design drawings was the most effective medium in spatial updating process in a VE. Contrary to the previous studies, there was no significant difference between gender and movement types.Sancaktar, İpekM.S

End-to-End Pixel-Based Deep Active Inference for Body Perception and Action

We present a pixel-based deep active inference algorithm (PixelAI) inspired by human body perception and action. Our algorithm combines the free-energy principle from neuroscience, rooted in variational inference, with deep convolutional decoders to scale the algorithm to directly deal with raw visual input and provide online adaptive inference. Our approach is validated by studying body perception and action in a simulated and a real Nao robot. Results show that our approach allows the robot to perform 1) dynamical body estimation of its arm using only monocular camera images and 2) autonomous reaching to "imagined" arm poses in the visual space. This suggests that robot and human body perception and action can be efficiently solved by viewing both as an active inference problem guided by ongoing sensory input

Newly married and long time married people whose marital problem solving skill levels relationship between subjecti̇ve well-being and marital satisfaction levels

Bu araştırma evli çiftlerin evlilik süresine bağlı olarak evlilikte karşılaştıkları problemlere yönelik çözüm becerilerinin, mutluluk (öznel iyi oluş) ve evlilik doyumuna olan etkisini incelemek amacıyla gerçekleştirilmiştir. Bunun yanı sıra, evlilikte problem çözme becerileri düzeyleri, öznel iyi oluş ve evlilik doyumu bazı demografik değişkenler açısından incelenmiştir. Araştırmaya İstanbul ilinde yaşayan, gönüllülük esasına göre rastlantısal olarak seçilen 100 evli birey katılmıştır. Araştırmada veri toplamak amacıyla "Evlilik Doyumu Ölçeği", "Öznel İyi Oluş Ölçeği", "Evlilikte Problem Çözme Ölçeği" uygulanmış ve ''Kişisel Bilgi Formu'' kullanılmıştır. Verilerin analizinde SPSS 20.0 paket programı kullanılmıştır. Yapılan değerlendirme ve analizler sonucuna göre; yeni evli çiftlerin evlilik doyumu uzun süreli evli olan çiftlere göre daha yüksektir. Böylelikle ana hipotezlerden biri desteklenmiştir. Ayrıca evlilik doyumu ile gelir düzeyi arasında da anlamlı bir ilişki olduğu sonucuna ulaşılmıştır. Buna ek olarak, evlilikte problem çözme ile yaş ve öğrenim durumu arasında anlamlı bir ilişki belirlenmiştir. Öznel iyi oluş ile çeşitli değişkenlerin bağlantılarına bakıldığında ise çocuk sayısı ve yaş değişkenlerinin, öznel iyi oluş ile anlamlı bir ilişki olduğu sonucuna ulaşılmıştır. Anahtar Kelimeler : Evlilik, Evlilik Doyumu, Evlilikte Problem Çözme Becerisi,Öznel İyi OluşThis study aimed to show that effects of problem solving skills in the marriage on martial satisfaction and subjective well being depending on duration of the marriage. Besides, problem solving skill level, marital satisfaction, subjective well being was observed in terms of some demographic variables. 100 married people who live in İstanbul, willing to help and had beed choosen randomly attended to the study. Marital satisfaction scale, subjective well being scale, problem solving skill in the marriage scale had beed used for collecting data for the study. The datas of study had been analized by SPSS 20.0 program. According to the results of the assesment and analysis, it was found that newly married people's marriage satisfaction was higher than long time married people's. Thereby one of the main hypothesis was supported. Besides, it was found that there was a significiant connection among problem solving in marriage, age and education level when it was observed relationship between subjective well being and various variables, it was found that there was relationship among subjective well being, the number of children and age variables. Key Words : Marriage, Marital Satisfaction, Subjective Well Being,Marital Problem Solving Skil