The Investigation of the Effect Caused by Deposition Velocity on Bonding Degree within the Structure of FDM

2018 ◽  
Vol 764 ◽  
pp. 142-155 ◽  
Author(s):  
Jie Li ◽  
Hong Bin Li ◽  
Jing Chuan Dong ◽  
Tai Yong Wang ◽  
Hai Tao Zhang
Keyword(s):  
Finite Element ◽  
Deposition Velocity ◽  
Quantitative Relationship ◽  
Optimal Temperature ◽  
Bonding Quality ◽  
Building Process ◽  
First Time ◽  
Area Deposition ◽  
Printing Method

In this paper, the effect of deposition velocity on bonding degree is studied in the aspects of experiment and theory. The experimental results show that the bonding quality of the adjacent filaments is weakened with increasing of deposition velocity. In addition, on the premise of guaranteeing every point in the building process to remain at the optimal temperature, the quantitative relationships between interval and filled area, deposition velocity are investigated by using the technique of deactivate and reactivate element of finite element. On the base of the quantitative relationships, the variable deposition velocity printing method is proposed for the first time. Namely, to reap the best bonding quality of filaments the time of completing one layer can be determined according to the filled area, and then, the optimal deposition velocity can be obtained according to the quantitative relationship between the interval and the deposition velocity. Printing the model at this speed can obtain the part with the best bonding quality between adjacent layers.

Building reputations

2018 ◽  
Author(s):  
Conor Lucey
Keyword(s):  
Primary Source ◽  
Real Estate Market ◽  
Architectural Drawings ◽  
Lower Tier ◽  
Building Process ◽  
The Social ◽  
The Status ◽  
Building Typology ◽  
First Time

This book advances an innovative look at a well known, if arguably often misunderstood, historic building typology: the eighteenth-century brick terraced (or row) house. Created for the upper tier of the social spectrum, these houses were largely designed and built by what is customarily regarded as the lower tier of the architectural hierarchy; that is, by artisan communities of bricklayers, carpenters, plasterers and related tradesmen. From London and Dublin to Boston and Philadelphia, these houses collectively formed the streets and squares that became the links and pivots of ‘enlightened’ city plans, and remain central to their respective historic and cultural identities. But while the scenographic quality of Bath and the stuccoed interiors of Dublin have long enjoyed critical approbation, the ‘typical’ house is understood less in terms of design and more in terms of production: consequently, historians have emphasized the commercial motivations of this artisan class at the expense of how they satisfied the demands of an elite, and taste-conscious, real estate market. Drawing on extensive primary source material, from property deeds and architectural drawings to trade cards and newspaper advertising, this book rehabilitates the status of the house builder by examining his negotiation of both the manual and intellectual dimensions of the building process. For the first time, Building Reputations considers the artisan as both a figure of building production and an agent of architectural taste.

scholarly journals Clarifying some assumptions of coastal management: Analysis of values and uncertainties embedded in beach quality indexes

2018 ◽  
Author(s):  
Briana Bombana ◽  
Eduard Ariza
Keyword(s):  
User Satisfaction ◽  
Scientific Data ◽  
Online Questionnaire ◽  
Resource Limitations ◽  
Building Process ◽  
Weak Points ◽  
First Time ◽  
Operational Development ◽  
Quality Indexes

For the first time, this research addresses the assessment of the quality of knowledge embedded in beach quality indexes from a socioecological perspective. We took the most widespread beach quality indexes and identified, selected and assessed the most important existing assumptions. We scored the robustness of these assumptions, using an inclusive methodology (stakeholder meeting, four focus groups and an online questionnaire). The NUSAP criteria for assessing the value-ladenness of scientific studies (Influence of resource limitations, (Im) Plausibility, Choice space, Agreement among peers, Analysts’ subjectivity and Influence on global results) were contrasted and discussed. A final list of the 10 weakest assumptions was presented and discussed. Most of these assumptions are fairly robust, but attention should mainly focus on their influence on global outcomes and (im) plausibility, as the weakest scored criteria. The choice space scores revealed the possibility of including new alternatives to the assumptions, when necessary. Assumptions loaded with framing concepts are weaker than those linked to more concrete objectives. We detected dissociation between the discourse and the operational development of the indexes, in which the narratives prioritizing user satisfaction are predominant and scientific data analysis is often decontextualized. We therefore suggest that science should be opened up throughout the building process of indexes: from the identification of problems to the reporting of results and related un- certainties. The NUSAP method proved to be useful for identifying weak points in beach quality indexes.

The effect of process parameters in fused deposition modelling on bonding degree and mechanical properties

2018 ◽  
Vol 24 (1) ◽  
pp. 80-92 ◽  
Author(s):  
Hongbin Li ◽  
Taiyong Wang ◽  
Jian Sun ◽  
Zhiqiang Yu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Layer Thickness ◽  
Deposition Velocity ◽  
Quantitative Relationship ◽  
Interface Bonding ◽  
Content Type ◽  
Work Mechanism ◽  
Predict Model ◽  
First Time

Purpose The purpose of this paper is to study the effects of these major parameters, including layer thickness, deposition velocity and infill rate, on product’s mechanical properties and explore the quantitative relationship between these key parameters and tensile strength of the part. Design/methodology/approach A VHX-1000 super-high magnification lens zoom three-dimensional (3D) microscope is utilized to observe the bonding degree between filaments. A temperature sensor is embedded into the platform to collect the temperature of the specimen under different parameters and the bilinear elastic-softening cohesive zone model is used to analyze the maximum stress that the part can withstand under different interface bonding states. Findings The tensile strength is closely related to interface bonding state, which is determined by heat transition. The experimental results indicate that layer thickness plays the predominant role in affecting bonding strength, followed by deposition velocity and the effect of infill rate is the weakest. The numerical analysis results of the tensile strength predict models show a good coincidence with experimental data under the elastic and elastic-softened interface states, which demonstrates that the tensile strength model can predict the tensile strength exactly and also reveals the work mechanism of these parameters on tensile strength quantitatively. Originality/value The paper establishes the quantitative relationship between main parameters including layer thickness, infill rate and deposition velocity and tensile strength for the first time. The numerically analyzed results of the tensile strength predict model show a good agreement with the experimental result, which demonstrates the effectiveness of this predict model. It also reveals the work mechanism of the parameters on tensile strength quantitatively for the first time.

Copper Oxide Direct Bonding of 200mm CMOS Wafers: Morphological and Electrical Characterization

2015 ◽  
Vol 2015 (1) ◽  
pp. 000594-000597
Author(s):  
Celso Cavaco ◽  
Lan Peng ◽  
Koen De Leersnijder ◽  
Stefano Guerrieri ◽  
Deniz S. Tezcan ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Cross Section ◽  
Electrical Characterization ◽  
Sem Images ◽  
Acoustic Microscope ◽  
Bonding Quality ◽  
Metal Levels ◽  
First Time ◽  
Resistance Value

We show for the first time complete data on 200mm wafer to wafer copper oxide direct bonding of two metal levels. Both surface acoustic microscope (SAM) and cross-section scanning electron microscope (X-SEM) images taken across the bonded wafer pairs confirm the good direct bonding quality of the resulting interface. Daisy chains with up to 3200 copper to copper bonded pads and of about 50mOhm/pad, are shown to be connected successfully and its resistance value to match a target value, as well as to scale linearly with the increase of connections in the chain.

Communication Sciences and Disorders PhD Graduates' Perceptions of Their PhD Program

2020 ◽  
Vol 5 (2) ◽  
pp. 463-478
Author(s):  
Elizabeth Crais ◽  
Melody Harrison Savage
Keyword(s):  
Detailed Examination ◽  
Career Expectations ◽  
Doctoral Preparation ◽  
Creative Solutions ◽  
Phd Education ◽  
Doctor Of Philosophy ◽  
First Time ◽  
Students Success ◽  
Phd Program

Purpose The shortage of doctor of philosophy (PhD)–level applicants to fill academic and research positions in communication sciences and disorders (CSD) programs calls for a detailed examination of current CSD PhD educational practices and the generation of creative solutions. The intended purposes of the article are to encourage CSD faculty to examine their own PhD program practices and consider the perspectives of recent CSD PhD graduates in determining the need for possible modifications. Method The article describes the results of a survey of 240 CSD PhD graduates and their perceptions of the challenges and facilitators to completing a PhD degree; the quality of their preparation in research, teaching, and job readiness; and ways to improve PhD education. Results Two primary themes emerged from the data highlighting the need for “matchmaking.” The first time point of needed matchmaking is prior to entry among students, mentors, and expectations as well as between aspects of the program that can lead to students' success and graduation. The second important matchmaking need is between the actual PhD preparation and the realities of the graduates' career expectations, and those placed on graduates by their employers. Conclusions Within both themes, graduate's perspectives and suggestions to help guide future doctoral preparation are highlighted. The graduates' recommendations could be used by CSD PhD program faculty to enhance the quality of their program and the likelihood of student success and completion. Supplemental Material https://doi.org/10.23641/asha.11991480

Towards Predicting Relative Belt Edge Endurance With the Finite Element Method

1990 ◽  
Vol 18 (4) ◽  
pp. 216-235 ◽  
Author(s):  
J. De Eskinazi ◽  
K. Ishihara ◽  
H. Volk ◽  
T. C. Warholic
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
The Finite Element Method ◽  
Shear Deformations ◽  
Element Analysis ◽  
Vertical Loading ◽  
Predicted Values ◽  
Element Method

Abstract The paper describes the intention of the authors to determine whether it is possible to predict relative belt edge endurance for radial passenger car tires using the finite element method. Three groups of tires with different belt edge configurations were tested on a fleet test in an attempt to validate predictions from the finite element results. A two-dimensional, axisymmetric finite element analysis was first used to determine if the results from such an analysis, with emphasis on the shear deformations between the belts, could be used to predict a relative ranking for belt edge endurance. It is shown that such an analysis can lead to erroneous conclusions. A three-dimensional analysis in which tires are modeled under free rotation and static vertical loading was performed next. This approach resulted in an improvement in the quality of the correlations. The differences in the predicted values of various stress analysis parameters for the three belt edge configurations are studied and their implication on predicting belt edge endurance is discussed.

Resveratrol: A new potential therapeutic agent for melanoma?

2019 ◽  
Vol 26 ◽  
Author(s):  
Mohamad Hossein Pourhanifeh ◽  
Kazem Abbaszadeh-Goudarzi ◽  
Mohammad Goodarzi ◽  
Sara G.M. Piccirillo ◽  
Alimohammad Shafiee ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Therapeutic Agent ◽  
Current Knowledge ◽  
Treatment Resistance ◽  
Anti Cancer ◽  
Apoptosis Inducer ◽  
Life Threatening ◽  
First Time

: Melanoma is the most life-threatening and aggressive class of skin malignancies. The incidence of melanoma has steadily increased. Metastatic melanoma is greatly resistant to standard anti-melanomatreatments such as chemotherapy, and 5-year survival rate of cases with melanoma who have metastatic form of disease is less than 10%. The contributing role of apoptosis, angiogenesis and autophagy in the pathophysiology of melanoma has been previously demonstrated. Thus, it is extremely urgent to search for complementary therapeutic approachesthat couldenhance the quality of life of subjects and reduce treatment resistance and adverse effects. Resveratrol, known as a polyphenol component present in grapes and some plants, has anti-cancer properties due to its function as an apoptosis inducer in tumor cells, and anti-angiogenic agent to prevent metastasis. However, more clinical trials should be conducted to prove resveratrol efficacy. : Herein, for first time, we summarize current knowledge of anti-cancerous activities of resveratrol in melanoma.

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