bluuebunny/crossref_metadata_2025 huggingface dataset:
Response of nitrogen on yield and seed quality of Boro rice
Authors: Khatun Amina , Bhuiya MSU , Saleque MA
Published: April 2015

Nitrogen (N), the most limiting nutrient in Bangladesh, for rice has been studied most rigorously, but its contribution to rice seed production remained relatively unexplored. An experiment was conducted during   season (November-April) in 2009-10 at the Bangladesh Rice Research Institute experimental farm, Gazipur, Bangladesh, to evaluate the effect of N fertilizer on seed yield and its quality. The experiment included BRRI dhan28 and BRRI dhan29 and 0, 50, 100, 150, 200 and 250 kg ha-1 N rates. Seed yield increased significantly in a quadratic fashion with the increase of N rate both in BRRI dhan28 and BRRI dhan29. Application of N fertilizer increased seed yield by about 3-4 t ha-1 compared to control. The highest yield of 5.15 and 6.34 t ha-1 was obtained with 150 kg N ha-1 in BRRI dhan28 and BRRI dhan29 respectively. However, the predicted economic optimum doses of N appeared as 156 and 158 kg ha-1 for BRRI dhan28 and BRRI dhan29 respectively. Nitrogen application to rice seed crop did not impair seed quality in terms of germination, viability, vigour and seed color. The seed N concentration ranged from 0.94 to 1.31% in BRRI dhan28 and 0.85 to 1.07% in BRRI dhan29 among different N rates. The seed phosphorus concentration varied from 0.30 to 0.41% in BRRI dhan28 and 0.28 to 0.36% in BRRI dhan29 among different N rates. The seed K varied from 0.23 to 0.27% and 0.20 to 0.23% in BRRI dhan28 and BRRI dhan29 respectively, among different N rates. The average seed protein of BRRI dhan28 (6.59%) was significantly higher than that of BRRI dhan29 (5.68%). Seed N and protein content slightly increased with the increase of N rate. Nitrogen application did not influence phosphorus and magnesium content in rice seed. However, seed potassium slightly decreased with the N application.Bangladesh Rice j. 2014, 18(1&2): 24-32
Evaluation of a Binary Semi-supervised Classification Technique for Probabilistic Record Linkage
Authors: Stausberg J. , Nasseh D.
Published: April 2015

Background: The process of merging data of different data sources is referred to as record linkage. A medical environment with increased preconditions on privacy protection demands the transformation of clear-text attributes like first name or date of birth into one-way encrypted pseudonyms. When performing an automated or privacy preserving record linkage there might be the need of a binary classification deciding whether two records should be classified as the same entity. The classification is the final of the four main phases of the record linkage process: Preprocessing, indexing, matching and classification. The choice of binary classification techniques in dependence of project specifications in particular data quality has not extensively been studied yet.

Objectives: The aim of this work is the introduction and evaluation of an automatable semi-supervised binary classification system applied within the field of record linkage capable of competing or even surpassing advanced automated techniques of the domain of unsupervised classification.

Methods: This work describes the rationale leading to the model and the final implementation of an automatable semi-supervised binary classification system and the comparison of its classification performance to an advanced active learning approach out of the domain of unsupervised learning. The performance of both systems has been measured on a broad variety of artificial test sets (n = 400), based on real patient data, with distinct and unique characteristics.

Results: While the classification performance for both methods measured as F-measure was relatively close on test sets with maximum defined data quality, 0.996 for semi-supervised classification, 0.993 for unsupervised classification, it incrementally diverged for test sets of worse data quality dropping to 0.964 for semi-supervised classification and 0.803 for unsupervised classification.

Conclusions: Aside from supplying a viable model for semi-supervised classification for automated probabilistic record linkage, the tests conducted on a large amount of test sets suggest that semi-supervised techniques might generally be capable of outperforming unsupervised techniques especially on data with lower levels of data quality.
Patient-Expressed Perceptions of Wait-Time Causes and Wait-Related Satisfaction
Authors: Mathews M. , Ryan D. , Bulman D.
Published: April 2015

Background: This study set out to identify patterns in the causes of waits and wait-related satisfaction. Methods: We conducted qualitative interviews with urban, semi-urban, and rural patients (n = 60) to explore their perceptions of the waits they experienced in the detection and treatment of their breast, prostate, lung, or colorectal cancer. We asked participants to describe their experiences from the onset of symptoms to the start of treatment at the cancer clinic and their satisfaction with waits at various intervals. Interview transcripts were coded using a thematic approach. Results: Patients identified five groups of wait-time causes: (1) Patient-related (beliefs, preferences, and non-cancer health issues); (2) Treatment-related (natural consequences of treatment); (3) System-related (the organization or functioning of groups, workforce, institution, or infrastructure in the health care system); (4) Physician-related (a single physician responsible for a specific element in the patient’s care); (5) Other causes (disruptions to normal operations of a city or community as a whole). With the limited exception of physician-related absences, the nature of the cause was not linked to overall satisfaction or dissatisfaction with waits. Conclusions: Causes in themselves do not explain wait-related satisfaction. Further work is needed to explore the underlying reasons for wait-related satisfaction or dissatisfaction. Although our findings shed light on patient experiences with the health system and identify where interventions could help to inform the expectations of patients and the public with respect to wait time, more research is needed to understand wait-related satisfaction among cancer patients.
Acute Toxicity of Hypofractionated Intensity-Modulated Radiotherapy for Prostate Cancer
Authors: Drodge C.S. , Boychak O. , Patel S. , Usmani N. , Amanie J. , Parliament M.B. , Murtha A. , Field C. , Ghosh S. , Pervez N.
Published: April 2015

Background: Dose-escalated hypofractionated radiotherapy (hfrt) using intensity-modulated radiotherapy (imrt), with inclusion of the pelvic lymph nodes (plns), plus androgen suppression therapy (ast) in high-risk prostate cancer patients should improve patient outcomes, but acute toxicity could limit its feasibility. Methods: Our single-centre phase ii prospective study enrolled 40 high-risk prostate cancer patients. All patients received hfrt using imrt with daily mega-voltage computed tomography imaging guidance, with 95% of planning target volumes (ptv68 and ptv50) receiving 68 Gy and 50 Gy (respectively) in 25 daily fractions. The boost volume was targeted to the involved imrt and the prostate (minus the urethra plus 3 mm and minus 3 mm from adjacent rectal wall) and totalled up to 75 Gy in 25 fractions. Acute toxicity scores were recorded weekly during and 3 months after radiotherapy (rt) administration. Results: For the 37 patients who completed rt and the 3-month follow-up, median age was 65.5 years (range: 50–76 years). Disease was organ-confined (T1c–T2c) in 23 patients (62.1%), and node-positive in 5 patients (13.5%). All patients received long-term ast. Maximum acute genitourinary (gu) and gastrointestinal (gi) toxicity peaked at grade 2 in 6 of 36 evaluated patients (16.6%) and in 4 of 31 evaluated patients (12.9%) respectively. Diarrhea and urinary frequency were the chief complaints. Dose–volume parameters demonstrated no correlation with toxicity. The ptv treatment objectives were met in 36 of the 37 patients. Conclusions: This hfrt dose-escalation trial in high-risk prostate cancer has demonstrated the feasibility of administering 75 Gy in 25 fractions with minimal acute gi and gu toxicities. Further follow-up will report late toxicities and outcomes.
Access to Oncology Consultation in a Cancer Cohort in Northeastern Ontario
Authors: Conlon M. , Hartman M. , Ballantyne B. , Aubin N. , Meigs M. , Knight A.
Published: April 2015

Background: To enhance cancer symptom management for residents of Sudbury–Manitoulin District, an ambulatory palliative clinic (pac) was established at the Northeast Cancer Centre of Health Sciences North. The pac is accessed from a medical or radiation oncology consultation. The primary purpose of the present population-based retrospective study was to estimate the percentage of cancer patients who died without ever having a medical or radiation oncology consultation. A secondary purpose was to determine factors associated with never having received one of those specialized consultations. Methods: Administrative data was obtained through the Ontario Cancer Data Linkage Project. For each index case, we constructed a timeline, in days, of all Ontario Health Insurance Plan billing codes and associated service dates starting with the primary cancer diagnosis and ending with death. Results: Within the 5-year study period (2004–2008), 6683 people in the area of interest with a valid record of primary cancer diagnosis died from any cause. Most (n = 5988, 89.6%) had 1 primary cancer diagnosis. For that subgroup, excluding those with a disease duration of 0 days (n = 67), about 18.4% (n = 1088) never had a consultation with a medical or radiation oncologist throughout their disease trajectory. Patients who were older or who resided in a rural area were significantly less likely to have had a consultation. Conclusions: Specific strategies directed toward older and rural patients might help to address this important access-to-care issue.
Secular Trends in the Survival of Patients with Laryngeal Carcinoma, 1995–2007
Authors: MacNeil S.D. , Liu K. , Shariff S.Z. , Thind A. , Winquist E. , Yoo J. , Nichols A. , Fung K. , Hall S. , Garg A.X.
Published: April 2015

Background: Recent reports suggest a decline over time in the survival of patients newly diagnosed with laryngeal cancer in spite of developments in treatment practices. Our study set out to determine whether the survival of patients with laryngeal cancer in Ontario has changed over time. Methods: This population-based cohort study of patients diagnosed with laryngeal cancer in the province of Ontario between 1995 and 2007 used data extracted from linked provincial administrative and registry databases. Its main outcomes were overall survival, laryngectomy-free survival, and survival ratio relative to an age- and sex-matched general population. Results: The 4298 patients newly diagnosed with laryngeal cancer during the period of interest were predominantly men (n = 3615, 84.1%) with glottic cancer (n = 2787, 64.8%); mean age in the group was 66 years (interquartile range: 59–74 years). Patient demographics did not significantly change over time. Overall, 5-year survival was 57.4%; laryngectomy-free survival was 45.4%. Comparing patients from three eras (1995–1998, 1999–2003, 2004–2007) and adjusting for age, sex, and comorbidity status, we observed no differences in overall survival or laryngectomy-free survival over time. The 5-year relative survival ratio for patients with laryngeal cancer compared with an age- and sex-matched group from the general population was 81.1% for glottic cancer and 44.5% for supraglottic cancer. Conclusions: In patients with a new diagnosis of laryngeal cancer, overall and laryngectomy-free survival have remained unchanged since the mid-1990s. New methods to improve survival and the rate of laryngeal preservation in this patient population are needed.
Management of egfr tki—Induced Dermatologic Adverse Events
Authors: Melosky B. , Leighl N.B. , Rothenstein J. , Sangha R. , Stewart D. , Papp K.
Published: April 2015

Targeting the epidermal growth factor receptor (EGFR) pathway has become standard practice for the treatment of advanced non-small-cell lung cancer. Compared with chemotherapy, EGFR tyrosine kinase inhibitors (TKIS) have been associated with improved efficacy in patients with an EGFR mutation. Together with the increase in efficacy comes an adverse event (AE) profile different from that of chemotherapy. That profile includes three of the most commonly occurring dermatologic AES: acneiform rash, stomatitis, and paronychia. Currently, no randomized clinical trials have evaluated the treatments for the dermatologic AES that patients experience when taking EGFR TKIS. Based on the expert opinion of the authors, some basic strategies have been developed to manage those key dermatologic AES. Those strategies have the potential to improve patient quality of life and compliance and to prevent inappropriate dose reductions.
Determination of Economic Indicators in the Context of Corporate Sustainability Performance
Authors: Pavláková Dočekalová Marie , Kocmanová Alena , Koleňák Jiří
Published: April 2015

This article is focused on determination of the most significant economic indicators influencing corporate sustainability performance. Corporate sustainability performance is a multidimensional concept based on the original idea of sustainable development, replacing the traditional understanding of corporate performance only as capital appreciation for owners (shareholders). Compared to the original concept of sustainable development which consists of environmental, social and economic performance, the so-called triple-bottom-line, it is broaden to the responsibilities and the impact of Corporate Governance on the corporate performance. The basic set of economic indicators has been constructed from a synthesis of resources developed by international organizations (Global Reporting Initiative, International Federation of Accountants) and research among manufacturing companies in the Czech Republic. The basic set of twenty-five key indicators is divided into seven groups: Costs, Investments, Economic Results, Asset and financial resources utilization, Suppliers reliability, Penalties and RandD expenses. Basic set of indicators was presented to 23 top-managers who quantified the potential effect of each indicator to the success and sustainability of their companies. Through the methods of descriptive statistics knowledge of the particularities of each indicator was obtained. Correlation analysis and factor analysis were applied in order to eliminate information duplicity and dimensionality reduction. The result is a reduction in the number of economic indicators, so that the loss of information on the influence of the original indicators on the corporate sustainability is minimized. Corporate sustainability indicators are a tool for measuring and managing progress towards sustainability goals and environmental, social and economic impacts.
Social Networks and their Importance in Job Searching of College Students
Authors: Potkány Marek , Hajduková Alexandra
Published: April 2015

At present, in every sphere of human activity, using modern ICT is considered as a matter of course. Several human resources management institutions are aware of the potential of social networks in estabilishing and building relationships with their target groups. It is a trend to create job portals in social networks. These are currently an integrated part of communication with target audience and therefore also an objects of attention and reflexions. It is also the topic of this paper. The goal of this research is to determine the level of use of social networks by college students in Slovakia. Part of the research is also to discover the effect of social networks on job searching of a selected sample of students. The research was conducted on a sample of 407 slovak students. A questioning method in form of an online questionnaire was used. The obtained results were processed using methods of descriptive and test statistics. We studied the significance of gender on the frequency of using the internet to search for job opportunities via social networks, as well as the ability to apprehend the importance of personal presentation on social networks. The statistical testing did not prove any significant difference between men and women in the question of frequency of using internet to search for job opportunities, nor in the ability to apprehend the importance of personal presentation on social networks. A statistically significant difference in gender was proven only in case of using social networks in job searching. Women tend to use social networks to find jobs more often than men. These statements are proved by the results of tests of significance of mean changes at the 5% significance level, which means that they are valid with 95% probability.
The implementation of social responsiveness initiatives: case of Lithuania
Authors: Navickas Valentinas , Kontautienė Rima
Published: April 2015

A concept of social responsibility reflects public concerns and issues for a specific time, and these change with time. Various stakeholders as consumers, customers, employees, trade unions, communities, non-governmental organizations, foundations, donors, investors are more and more interested in the activities of companies (organizations), and influence on them in a variety of ways. Companies, for their part, also look for ways to meet the expectations of the public in the area of social responsibility. Corporate social responsiveness is an ability of business to respond to social pressure. The article analyzes the implementation of social responsiveness initiatives as organizational programs. Social responsiveness is understood as action dimension of corporate social responsibility. The paper deals with implementation of social responsiveness initiatives in Lithuania. Researched the socially responsiveness initiatives as organizational programs, the authors found that an active development of corporate social responsiveness positively influences on businesses and society relationship and contribute to sustainable development of region or country.
Creep Behavior of a 4.5% Re Nickel-Base Single Crystal Superalloy at High Temperature
Authors: Shu De Long , Tian Su Gui , Ding Xin , Wu Jing , Li Qiu Yang , Jiang Chong Liang
Published: April 2015

By means of heat treatment and creep property measurement, an investigation has made into the creep behaviors of a containing 4.5% Re nickel-base single crystal superalloy at high temperature. Results show that the elements W, Mo and Re are enriched in the dendrite arm regions, the elements Al, Ta, Cr and Co are enriched in the inter-dendrite region, and the segregation extent of the elements may be obviously reduced by means of heat treatment at high temperature. In the temperature ranges of 1070--1100 °C, the 4.5% Re single crystal nickel-based superallloy displays a better creep resistance and longer creep life. The deformation mechanism of the alloy during steady state creep is dislocations slipping in the γ matrix and climbing over the rafted γ′ phase. In the later stage of creep, the deformation mechanism of alloy is dislocations slipping in the γ matrix, and shearing into the rafted γ′ phase, which may promote the initiation and propagation of the micro-cracks at the interfaces of γ/γ′ phases up to the occurrence of creep fracture.
Numerical Simulation and Experimental Study on the Contact Pressure between Bipolar Plate and GDL in a PEM Fuel Cell
Authors: Han Xue Mei , Tan Jin Zhu , Liu Yong Chang , Li Peng , Pan Long
Published: April 2015

Both assembly force and temperature play an important role in the proton exchange membrane (PEM) fuel cell performance. In this paper, contact pressure between bipolar plate and gas diffusion layer (GDL) in a PEM fuel cell under various assembly forces and at different temperatures was studied numerically. Considering the coupling effects of assembly force and operating temperature on contact pressure, a three-dimensional finite element model of the PEM fuel cell was established and the contact pressure between the GDL and the bipolar plate was studied using commercial code ABAQUS. In order to verify the simulated results, the experimental study was conducted to investigate the contact pressure distribution between the bipolar plate and the GDL. The experimental results are in good agreement with the finite element method (FEM) results. The simulated and experimental results reveal that the contact pressure increased with the increase of assembly force and temperature. It is found that the contact pressure distribution between the bipolar plate and the GDL had the best uniformity under the applied torque of 3.0N·m and at the operating temperature of 80 °C in this work.
Atomistic Simulation of Fatigue Crack Growth in α-Fe under High Temperature
Authors: Liu Tong , Liu Min Shan
Published: April 2015

The crack growth behaviors loaded in mode I under strain and stress control at different temperatures were presented in α-Fe by atomistic simulations using LAMMPS code. The interatomic bonds of atoms were characterized using the embedded atom method interatomic potential. The simulation models were built with initial edge crack subjecting to cyclic uniaxial constant strain rate and constant stress. A temperature range from 100 K to 1200 K was considered to probe the influence of the temperature on crack growth. The crack growth mechanism and the radial distribution function (RDF) during crack growth were investigated. The results indicated that the crack propagation mechanisms were sensitive to temperature and the boundary conditions. By proposed image adjusting technology the dislocation slip bands can be more clearly displayed on screen. In order to include the effect of temperature on crack growth, a temperature factor defined as a function of temperature in exponential form was introduced to modify the theoretical expressions based on thermal activation theory. Its coefficient and index can be determined by the RDF peak value obtained from atomistic simulations. For cyclic loading the crack growth process was dependent on both temperature and cyclic loading period in terms of simulations.
Numerical Analysis of Constraint and Strength Mismatch Effects on Local Fracture Resistance of Bimetallic Joints
Authors: Fan Kai , Wang Guo Zhen , Yang Jie , Xuan Fu Zhen , Tu Shan Tung
Published: April 2015

In this paper, the finite element method (FEM) based on GTN model was used to investigate the in-plane/out-of-plane constraint and strength mismatch effects on local fracture resistance of A508/Alloy52Mb bimetallic joint. TheJ-resistance curves, crack growth paths and local stress-stain distributions in front of crack tips were calculated for cracks with different constraints and strength mismatches. The results show that the local fracture resistance of the interface crack in this joint is sensitive to constraint and strength mismatch effects. With increasing in-plane constraint (crack deptha/W), out-of-plane constraint (specimen thicknessB) and strength mismatch degree, the plastic strain and stress triaxiality around crack tip increase, and the corresponding crack growth resistance decreases. The crack with strength mismatch factorM=1 displays a markedly higher crack growth resistance than the other cracks withM>1 andM<1. It also has been found that there is an interaction between in-plane/out-of-plane constraint and strength mismatch for the bimetallic joint. With increasing in-plane/out-of-plane constraint, strength mismatch effect on fracture toughness becomes weaken. For accurate and reliable safety design and failure assessment of the bimetallic joint structures, the effects of constraint and strength mismatch on local fracture resistance need to be considered.
Resistance Spot Weldability of Hot-Formed Ultra High Strength Steel Based on Virtual and Physical Experiment
Authors: Yu Zhi Shui , Dong Wan Peng , Ma Chun Wei , Ren Jiang Wei , Li Bi Hao , Ji Yu Rong
Published: April 2015

In this study, virtual and physical experimental investigations were performed on the resistance spot weldability of hot-formed ultra high strength steels (UHSS). The sheets were joined by the resistance spot welding as lap or cross joint. The mechanical properties were assessed in terms of cross tension strength (CTS) and tensile shear strength (TSS). The micro structural profile and weld nugget diameter were also investigated. Both virtual and physical methods yielding results are in good agreement. The results are discussed in the light of earlier work published in the literature and contribute to a better understanding on the evaluation of resistance spot weldability.
Study on Mechanical Behavior of Plastic Pipe Reinforced Cross-Winding Steel Wire Subjected to Non-Axis Line Symmetric Surface Load on Soil
Authors: Li Xiang , Li Wei Feng , Xu Liu Yun
Published: April 2015

Plastic pipe reinforced by cross helically wound steel wires (PSP) is a new plastic-matrix steel composite pipe developed in China recently. To deeply understand the mechanical properties of buried PSPs, a finite element model of PSP subjected to non-axis symmetric load is proposed. The model is verified by replacing the parameters of PSP by those of steel pipe. A good agreement shows that the model can be used to analyze mechanical behavior of buried PSP. Finally, the influences of internal pressure, properties of soil, geometry parameters of PSP and magnitude of load, etc. are discussed.
Finite Element Simulation of the Creep Behavior of 2.25Cr-1Mo-0.25V Steel Based on Continuum Damage Mechanics
Authors: Zhou Yu , Chen Xue Dong , Fan Zhi Chao , Han Yi Chun
Published: April 2015

The creep behavior of 2.25Cr-1Mo-0.25V ferritic steel was investigated using a set of physically-based creep damage constitutive equations. The material constants were determined according to the creep experimental data, using an efficient genetic algorithm. The user-defined subroutine for creep damage evolution was developed based on the commercial finite element software ANSYS and its user programmable features (UPFs), and the numerical simulation of the stress distribution and the damage evolution of the semi V-type notched specimen during creep were studied. The results showed that the genetic algorithm is a very efficient optimization approach for the parameter identification of the creep damage constitutive equations, and finite element simulation based on continuum damage mechanics can be used to analyze and predict the creep damage evolution under multi-axial stress states.
Influence of the Residual Stress on Mechanical Properties of Ductile Materials by Simulating Small Punch Test
Authors: Wang He Hui , Zhang Shao Jie , Wang Yao Gang , Guan Kai Shu
Published: April 2015

This paper describes an approach to identify the influence of mechanical properties of the materials under the condition of containing residual stress. The numerical method of simulating small punch test (SPT) is used to determine the material response under loading. The simulated material behavior of the specimen is based on the ductile elastoplastic damage theory of Gurson, Tvergaard and Needleman (GTN). The residual stress can be prefabricated on the specimen by loading and unloading. By comparing the original specimen with the specimen contains residual stress, the change of the mechanical properties of the materials can be studied. The results of simulation indicate that the material properties decrease with the increase of the residual stress.
Three-Dimensional Leak before Break Analysis of Nuclear Pipes Containing Cracks
Authors: Liang Wen Fu , Liu Tong , Liu Min Shan
Published: April 2015

Three-dimensional crack behavior simulation analysis and anti-fracture design have been a main subject in fracture theory and engineering application. Piping system is a key part of nuclear power engineering. Utilizing the three-dimensional finite element analysis software ANSYS and the specialized crack analysis programs Franc3D, three-dimensional crack behavior and leak before break (LBB) case were simulated and evaluated of a pipe with a crack in waste heat exhaust system of China Experimental Fast Reactor ( CEFR ). In fast reactor, the piping is working under a high temperature. Therefore, the code RCC-MR.A16 was adopted that is suitable for materials and structural safety design at high temperature. Material used in this article is modified 9Cr1Mo-T91/P91. The analysis model of pipe section was built in three-dimensional entity structure containing a cracks and the high temperature and creep effects were considered. The simulation results show that creep contributes more effect on crack growth than fatigue. The evaluation results on LBB of studied T91 steel pipe with a crack-like defect can satisfy the need of LBB design guidelines. The research results can be referenced in pipe material choose, safety assessment and structural integrity evaluation of a pipe containing defects at high temperature in a fast reactor design.
All Set Theory in the Fuzzy-Random Creep Fracture Model
Authors: Wang Wei , Zhong Wan Li , Liu Chang Hong , Xuan Fu Zhen
Published: April 2015

According to the all set theory, a fuzzy-random creep fracture model was presented in this work. To deal with the function, the following steps were taken. First, the steady state creep coefficient (A) and steady state creep exponent (n) were considered in the fuzzy-random variables, then the C*-integral was considered in a fuzzy-random variable. Finally, with the interval analysis, the result of the fuzzy-random creep fracture model was given.
The Strain-Based Failure Assessment Diagram for Commercially Pure Titanium TA2
Authors: Sun Bin , Zhou Chang Yu , He Xiao Hua
Published: April 2015

Strain-based failure assessment methods have been usually used in recent years to propose the fitness-for-service flaws. In this paper, the stress-based and strain-based failure assessment diagram (SB-FAD) approaches were reviewed firstly. Then, SB-FAD approach was used to the material commercially pure titanium TA2 with high strain-hardening coefficient. Several failure assessment curves obtained from strain-based method for four typical specimens, i.e., CCP (center-cracked plate), DECP (double edge cracked plate), SECP (single edge cracked plate) and CT (compact tension) were proposed. It was found that the geometries and crack sizes had obvious effects on the failure assessment curves. By comparing with the stress-based failure assessment curves, the traditional strain-based failure assessment curves could lead to more conservatism in the stage after yielding. However, the SB-FAD modified by Ainsworth can be used.
A Vibro Acoustic Method for Non Destructive Test of Composite Sandwich Structures
Authors: de Avelar Gomes Márcio H. , Bonifácio Paulo R.O. , de Carvalho Mário O.M. , de Deus Hilbeth Parente Azikri
Published: April 2015

The present work describes an investigation into a vibro-acoustic method to check the existence of superficial flaws in composite sandwich structures, based in a technique inspired in the well known Tap Test. In this case, however, a non-impulsive excitation is provided by an especial transducer and the acoustic response is captured with a microphone. A deconvolution technique is used in order to assess the system's impulse response and generate a “failure” map after post-processing the results. Post-processed parameters evaluated are: Loudness, Sharpness and a discrepancy indicator for the transfer function (named TFDI). Results suggest that Loudness and TFDI potentially indicate the existence of a damaged core and the lack of adhesive tape.
Study on the Fractal Dimension of Rock Fracture Surface after Different Temperatures
Authors: Xu Xiao Li , Chen Lin , Zhu Xue Wei
Published: April 2015

In order to study the relationship between the fractal dimension of rock fracture surface and temperature, uniaxial compression experiments on the granite rock and scanning electron microscopy experiments on the rock fracture surface were carried out after different temperatures. The fractal dimension was calculated by using scanning electron microscopy images. The results are as following: (1) The cracks show intergranular damage like rock candy, rivers and so on at the temperature from 25°C to 200°C. The fractal dimension are volatile, the fractal dimension reach the maximum at 200 °C, it can be inferred that the granite rock burst the most energy consumption at 200 °C; (2) From 200°C to 800°C, the cracks transform from stepped cleavage, intergranular fracture gradually to grain crushing, transgranular cracking damage with the rise of temperature. When the temperature is above 800 °C, the cracks transform from the transgranular cracks, shear slip bands gradually to dimples and microporous points. The cracks of rock surface transform from irregular crack structure to homogeneous pore structure gradually at high temperature, the weakening of rock heterogeneity is the basic reason for the decrease of fractal dimention of rupture surface, the fractal dimension is reduced from 1.634 at 200 °C to 1.595 at 1200 °C, the margin of reduction is 2.39%. At the same time, the energy consumption of rock rupture decreases with the rise of temperature, rock transforms from brittle to plastic gradually.
Dynamic Buckling of Elastic Cylindrical Shells under Axial Step Load
Authors: Wang Jia Qun , Han Zhi Jun , Lu Guo Yun
Published: April 2015

Considering the effect of stress wave, the dynamic buckling of circular cylindrical shells under an axial step load is discussed using the classical shell theories and the state-space technique in the paper. Based on the Hamilton’s principle, the dynamic buckling governing equations of shells are derived and solved with the Rayleigh-Ritz method. If the linear homogeneous equations have a non-trivial solution, the determinant of the coefficient matrix must be equal to zero, so the expression of the critical load on the dynamic buckling is got. The relationship between the critical load and length is obtained by using MATLAB software. The influences of boundary conditions, thickness, the number of circumferential waves and the number of axial waves on the dynamic buckling loads are discussed based on numerical computation.
Research on the Dynamic Buckling of Composite Laminated Plates with One Edge Fixed and Three Edges Simply-Supported
Authors: Li Nan , Han Zhi Jun , Lu Guo Yun
Published: April 2015

Taking into account the effects of stress wave and the moment of inertia, the governing equations of composite laminated plate under the axial step load are derived by using Hamilton principle. Based on Variable Separation Method, the analytical expression of the critical dynamic buckling load for symmetry composite laminated plates with one edge fixed and three edges simply-supported can be deduced by considering the characteristics of the buckling solution, and the buckling mode is also acquired. Using MATLAB software, the relationship between the critical load and length can be obtained. The influences of different layer parameters and the order of the mode on the dynamic buckling are discussed.
Estimation of THIV for Car Crash against Attachable Roadside Barriers Made of the High Strength Steel
Authors: Jung Woo Young , Noh Myung Hyun , Lee Sang Youl
Published: April 2015

A finite element simulation study was performed to gain the theoretical head impact velocity about the crash test details. Accuracy of the simulation was verified using qualitative and quantitative comparisons. Based on in-depth examination of crash simulation recordings, energy distributions occurred in the barrier against the car are determined. In this paper, the existing finite element crash analysis of barriers using the LS-DYNA program is further extended to study the dynamic response of the barrier with module structures connected by anchor bolt inserted through concrete bridge decks. The numerical results for various parameters are verified by comparing different models with or without the high strength steel such as HS800.
Enhanced Heat Transfer in Square Duct Fitted Diagonally with Double-Sided V-Ribbed Tapes
Authors: Kaewkohkiat Ying Yong , Tamna Sombat , Promvonge Pongjet
Published: April 2015

An experimental study on heat transfer enhancement in a heat exchanger square-duct fitted diagonally with 45° V-ribbed tapes has been conducted. The tested duct has a square section and uniform heat-fluxed walls and the flow rate of air used as the test fluid is presented in terms of Reynolds number from 4000 to 25,000. The insertion of the V-ribbed tape is performed with a rib-pitch to duct-height ratio, (P/H=PR=0.75 and 2) at the rib attack angle of 45° with respect to the main flow direction. The V-ribbed tape inserted diagonally in the duct is expected to generate a longitudinal vortex flow pair in each tape side through the heated duct. Influences of four rib-to-duct height ratios (e/H=BR=0.1, 0.15, 0.2 and 0.25) on the heat transfer and pressure drop in terms of respective Nusselt number and friction factor are investigated. The experimental result indicates that the BR and PR of the V-ribs provide a significant effect on the thermal performance of the test duct. The results reveal that at smaller PR, the V-rib with BR=0.25 provides the highest heat transfer and friction factor but the one with BR=0.2, PR=0.75 yields the best thermal performance.
Preliminary Analysis of Unprotected Loss of Heat Sink in Small Long Life Gas Cooled Fast Reactor
Authors: Zaki Su'ud , Trianti Nuri , Indah Rosidah M.
Published: April 2015

The failure of the secondary side in Gas Cooled Fast Reactor system, which may contain co-generation system, will cause loss of heat sink (LOHS) accident. In this study accident analysis of unprotected loss of heat sink due to the failure of the secondary cooling system has been investigated. The thermal hydraulic model include transient hot spot channel model in the core, steam generator, and related systems. Natural circulation based heat removal system is important to ensure inherent safety capability during unprotected accidents. Therefore the system similar to RVACS (reactor vessel auxiliary cooling system) is also plays important role to limit the level of consequence during the accident. As the results some simulations for small 60 MWt gas cooled fast reactors has been performed and the results show that the reactor can anticipate the failure of the secondary system by reducing power through reactivity feedback and remove the rest of heat through natural circulations based decay heat removal (RVACS system).
Application of the Method of Galerkin to Non Linear Problem Stochastic Heat Conduction One-Dimensional
Authors: da Silva Claudio Roberto Ávila , Azikri de Deus Hilbeth Parente , Kozlik Antonio , Garcia Oscar S.
Published: April 2015

The Galerkin method is applied in the non-linear stochastic diffusion problem. The uncertainty is present in the coefficients of diffusion equation. The uncertainty is modeled by random variables. The chaos polynomials is used to approximate the stochastic behavior of the problem. The approximate solutions obtained through Galerkin method are compared with Monte Carlo simulation in terms of the statistical moments of random variables generated by the random field solution.
Oxidation Characteristics of Cr2O3-La2O3 and NiAl-La2O3 Coated on Ferritic Stainless Steel by Thermal Spray Method
Authors: Ramdan Raden Dadan , Setiawan Asep Ridwan , Suratman Rochim
Published: April 2015

The present works concerns in evaluating thermal oxidation characteristic of composite coating on ferritic stainless steel at high temperature application. SUS430 ferritic stainless steel was used as the substrate material whereas Cr2O3-La2O3 and NiAl-La2O3 were used as the coating material. Thermal spray has been used as the deposition method, whereas thermal oxidation at temperature of 750°C for 24, 48 and 96 hours has been employed on the coated material in the atmosphere environment. From the weight meausurement before and after thermal oxidation, it was observed insignificant weight losses, whereas this condition is stable for all the applied oxidation period. However weight losses is more on the NiAl-La2O3 as compared with Cr2O3-La2O3 samples, which is due to the morphological characteristic of the former layer as observed by scanning electron microscope (SEM) characterization. From X-ray diffraction (XRD) characterization, it was observed the formation of stable layer Cr2O3 for Cr2O3-La2O3 coated samples, whereas formation of NiO observed for the case of NiAl-La2O3 sample.
Efficiency of Agricultural Wastes for the Removal of Gasoline from Water
Authors: Kudaibergenov Kenes , Tulepov Marat , Ongarbayev Yerdos , Mansurov Zulkhair
Published: April 2015

In this work, we report polyurethane foam, sunflower husk and rice husk ash prepared via a thermal treatment process used as oil sorbents for oil spill cleanup. The oil sorbent was studied on the basis of microstructure and morphology using optical digital microscopy and scanning electron microscopy (SEM). The results of the SEM and optical microscopy studies strongly indicate that thermal treatment is a suitable method to improve structure of husk particles regarding porosity compared to virgin samples. The dependence of the sorption capacity of the sorbents on the amount of sorbent, sorption time and the thickness of the oil film, as well as the number of cycles of the sorbents were investigated.
A Numerical Approach on New Constitutive Model for Thixotropic Substances
Authors: Pinto Silva Thales Augusto Barbosa , de Deus Hilbeth Parente Azikri , Ribeiro Negrão Cezar Otaviano
Published: April 2015

The thixotropic substances can be found in different industrial sectors, such as chemical, biomedical, manufacturing and oil. These substances show a rheological time-dependent behavior, dependent of their structural level. Generally, a constitutive model for the thixotropic substances is composed by a pair of coupled equations: the constitutive equation (based on viscoelastic models) and the rate equation (that describes the structural evolution). In many works presented in the specialized literature, the shear modulus and viscosity dependencies with the structural nature are not formally considered in the dynamical principles from that the constitutive equation is originated. In the present work, a new, thermodynamically consistent, constitutive model for thixotropic substances, where such dependences are considered, is presented and some rheological tests are analyzed in a numerical simulation point of view (code developed in MATLAB). The constitutive model is based on Jeffreys’ model and the coagulation theory of Smoluchowsky.
The Design of Pneumatic Visual Servo Positioning System
Authors: Zhu Li Kai , Zhao Dean , Ji Wei , Chen Yu
Published: April 2015

In view of the slowing expansion problem for the past harvesting robot’s electric push rod joint.This paper will adopt pneumatic draw stem instead of the original electric putter to improve the rapidity of servo system. Using VFW(Video for Windows) image acquisition system to access to the video buffer without generating the intermediate files,which can ensure high real-time performance. By monocular vision system to realize cylinder tracking control experiments for the fruit center position. Experiments verified the quickness and accuracy of the pneumatic servo positioning system.
Home Patient Sensor and Monitor System Using IPhone
Authors: Subpratatsavee Puchong , Promjun Tanabat
Published: April 2015

Health-care situations in present have pass to be a technology-based. In addition to handheld devices like a mobile phone and their habit has risen abundant in current period. This research presents the design and implementation of application on IPhone for patient health-care. A physique zone network is a WIFI of biomedical sensors that are around to a man body. The aim of wireless body area network is to assist the progress of continuous recording and monitoring of a person’s health circumstances and transfer it over a long-distance exchanging network. The parameters sensed by the distinctive devices are to be moved onto a mobile phone or a tablet using wireless network. This information is then assembled, stored, check for threshold and then sent to the doctor for constant monitoring of the patient’s health condition. The doctor can thus access the patient’s health status on the go and this will help the patient to get suddenly attention in life-threatening situations.
Object Movement Computation from Two Images
Authors: Park Ji Hun , Park Sung Hun
Published: April 2015

This paper presents a new object movement computation method using ray vectors generated from two cameras. We compute camera's internal and external parameters of the input images using computed values from partially overlapping input image frames which has the same corresponding fixed feature points. This is achieved by computing fixed points in the environment, camera distortion values and internal and external parameters from stationary objects. Ray vectors cast from each camera to feature points keep camera external parameter values. Using computed camera external parameters, a tracked object's rigid object movement is estimated using maximum likelihood estimation by setting projected intersection points between ray vectors as a part of objective function. Our method is demonstrated and the results are compared to our another movement computation algorithm.
The Measurement of the Voltage Distribution along High Voltage Suspension Porcelain (5-6-7 Insulator)/String in Case of Clean Condition
Authors: Tonmitr Norrawit , Kaneko Eiji , Tonmitr Kittipong , Kaewrawang Arkom , Suksri Amnart
Published: April 2015

The operational voltage or the voltage distribution along porcelain insulator string is affected by stray capacitances, which causes a non-uniform voltage distribution. The recital of insulator sometimes depends on the amount of insulator/string. In order to explain these activities and phenomena clearly in this research, an equivalent circuit that takes the insulator material properties and the stray capacitances is implemented in the TINA program package to analyze the voltage distribution along the insulator string with and without guard ring under power frequency voltage. Finally, the simulation results of voltage distribution have been compared with experimental results, which were obtained in the KKU High Voltage Research Laboratory. To investigate the voltage along across each (5, 6, 7) insulator/string in clean condition, the string efficiency has been measured by sphere gap method. From the simulation results, the voltage across (5, 6, 7 clean and contaminated insulator/string) with and without guard ring were simulated by the TINA program. From this simulation results, we found that the string efficiency of clean string insulator condition which the insulator consists of 5, 6, 7 insulator/string without guard ring equals 66.92, 58.45 and 53.71%, respectively. The string efficiency which the insulator consists of 5, 6, 7 insulator/string with guard ring equals 90.42, 87.03 and 78.35%, respectively. In the experiment, the sphere gap was used to measure the voltage along insulation string. In case of the clean string insulator condition, the string efficiency which the insulator consists of 5, 6, 7 insulator/string without guard ring equals 69.12, 62.67 and 57.04%, respectively. The string efficiency which the insulator consists of 5, 6, 7 insulator/string with guard ring equals 76.36, 66.69 and 59.76%, respectively.
Thermodynamic Approach for Identifying Oxidative Processes Insulation Breakdown
Authors: Dubyago Marina N. , Poluyanovich Irina A. , Poluyanovich Nikolay K.
Published: April 2015

Problematic issues insulation of power cable systems (PCS) based on the design and development of non-destructive methods are considered in the paper. The basic components of the PCS, destroying the insulation, are determined. The analytical method for assessing the oxidation processes of cellulose with the definition of the most probable is proposed. The approach for identifying the main processes of destruction of the insulation allows more detail to present background to the development of partial discharges (PD) in insulation and to identify measures for minimizing processes that lead to the destruction of the insulation PCS.