Hétérogénéité des aciers de construction et calcul aux états-limites

1983 ◽  
Vol 10 (3) ◽  
pp. 350-361
Author(s):  
P. Dumonteil
Keyword(s):  
Yield Stress ◽  
Bending Strength ◽  
Mean Value ◽  
Test Results ◽  
Stress Tests ◽  
Column Tests ◽  
Performance Factors ◽  
The Mean ◽  
Stub Column ◽  
Testing Speed

Proceeding from yield stress tests on ductile structural steels, the article studies the various factors influencing the ultimate strength of beams in plastic bending. The influence of the testing speed is briefly reviewed. The heterogeneity with the cross section of rolled shapes is then examined to bring out the fundamental importance of the ratio of flange yield stress to web yield stress. The mean value of this ratio is of the order of 0.87 and its coefficient of variation approximately 0.06.The influence of thickness is studied to show the desirability of systematic testing.The data supplied by AISI surveys permit the investigation of longitudinal heterogeneity and its impact on bending strength test results. It is then shown why tests on redundant beams and frames are more useful than those on determinate beams.Combining the two types of heterogeneities, longitudinal and transversal, the approximate values of the performance factors may be calculated and compared with the values published until now.Finally, the aspect of quality control is examined and some remarks made on stub column tests. The conclusion is offered that, in accordance with logic, test coupons should no longer be taken in the web, but rather in the flanges of rolled shapes.

scholarly journals PHYSICAL AND MECHANICAL PROPERTIES OF BLACK WOOD (EBONY) AS A CONSTRUCTION MATERIAL

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Fengky Satria Yoresta
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Strength Class ◽  
Construction Material ◽  
Physical And Mechanical Properties ◽  
Mean Value ◽  
Building Structures ◽  
Test Results ◽  
The Mean ◽  
Heavy Construction

This research is aimed to determine physical and mechanical properties of Ebony wood as a construction material. The physical and mechanical properties test is conducted based on ASTM D 143-94 code. The mean value of moisture content and specific gravity of Ebony wood is obtained 12,90% and 0,92 gr.cm-3 respectively. Meanwhile MOE, bending strength, compressive strength parallel to grain, shear strength, and tensile strength parallel to grain are 180.425,87 kg.cm-2; 1656,22 kg.cm-2; 861,55 kg.cm-2; 119,61 kg.cm-2; dan 2.319,03 kg.cm-2 respectively. Based on the test results, it can be concluded that Ebony wood is classified to Strength Class I due to PKKI 1961, so it can be recommended for use in heavy construction such as bridge and building structures Penelitian ini bertujuan menentukan sifat fisis dan mekanis kayu  Ebony sebagai material konstruksi. Pengujian sifat fisis dan mekanis dilakukan berdasarkan standar ASTM D 143-94. -3Nilai kadar air rata-rata kayu Ebony diperoleh sebesar 12,90% dan berat jenis 0,92 gr.cm . Sementara nilai rata-rata MOE, kuat lentur, kuat tekan sejajar serat, kuat geser, dan kuat tarik -2 -2 -2sejajar serat berturut-turut adalah 180.425,87 kg.cm ; 1656,22 kg.cm ; 861,55 kg.cm ; -2 -2119,61 kg.cm ; dan 2.319,03 kg.cm . Berdasarkan hasil penelitian dapat disimpulkan bahwa kayu Ebony tergolong kelas kuat I menurut PKKI 1961, sehingga dapat direkomendasikan untuk digunakan pada konstruksi-konstruksi berat seperti jembatan dan struktur bangunan.

scholarly journals Research on Intelligent Compaction Technology of Subgrade Based on Regression Analysis

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Ziyi Hou ◽  
Xiao Dang ◽  
Yezhen Yuan ◽  
Bo Tian ◽  
Sili Li
Keyword(s):  
Resilient Modulus ◽  
Single Point ◽  
Mean Value ◽  
Test Results ◽  
Intelligent Compaction ◽  
One Dimensional ◽  
Remote Monitoring System ◽  
The Mean ◽  
The One ◽  
Compaction Degree

A remote monitoring system with the intelligent compaction index CMV as the core is designed and developed to address the shortcomings of traditional subgrade compaction quality evaluation methods. Based on the actual project, the correlation between the CMV and conventional compaction indexes of compaction degree K and dynamic resilient modulus E is investigated by applying the one-dimensional linear regression equation for three types of subgrade fillers, clayey gravel, pulverized gravel, and soil-rock mixed fill, and the scheme of fitting CMV to the mean value of conventional indexes is adopted, which is compared with the scheme of fitting CMV to the single point of conventional indexes in the existing specification. The test results show that the correlation between the CMV and conventional indexes of clayey gravel and pulverized gravel is much stronger than that of soil-rock mixed subgrades, and the correlation coefficient can be significantly improved by fitting CMV to the mean of conventional indexes compared with single-point fitting, which can be considered as a new method for intelligent rolling correlation verification.

Effect of Incorporating Zirconia Powder into a Primer on the Resin Bond Strength to Zirconia Ceramic

2020 ◽  
Vol 20 (9) ◽  
pp. 5575-5578
Author(s):  
Eunkyung Lee ◽  
Yangho Lee ◽  
Young Kyung Kim ◽  
Chan Ho Park ◽  
Tae-Yub Kwon
Keyword(s):  
Bond Strength ◽  
Resin Composite ◽  
Mean Value ◽  
Zirconia Ceramic ◽  
Test Results ◽  
Zirconia Powder ◽  
Scanning Calorimetry ◽  
The Mean ◽  
Ftir Spectrophotometry

The adhesion property of zirconia powder-incorporated primers was investigated in vitro with the aim of enhancing the resin bond strength to zirconia ceramic. A commercial zirconia primer was modified through the addition of 0 (control), 5, 10, 25, and 50 wt% of a zirconia powder (codes: ZP0, ZP5, ZP10, ZP25, and ZP50, respectively). Prior to primer modification, the powder was characterized via differential scanning calorimetry (DSC) and Fourier-transform infrared (FTIR) spectrophotometry. The surfaces of dental zirconia ceramic discs were air-abraded and treated with one of the five primers. One resin composite cylinder (diameter: 2.38 mm) was bonded on one specimen surface (n = 12/group). The bonded specimens were all stored for 24 h in distilled water at 37 °C and subjected to 5000 thermal cycles prior to shear bond strength (SBS) testing. The DSC and FTIR analyses confirmed that the zirconia powder contained an organic binder. The SBS test results showed that the groups could be arranged as follows, ZP25 > ZP10 > ZP5 > ZP0, i.e., in descending order of the mean value. The lowest SBS value was obtained for the ZP50 group. The results suggest that the incorporation of a zirconia powder into a primer represents a promising modification method for improving the resin bond strength to zirconia ceramic.

Research on the Calculation Method for Bending Rigidity of Recycled Concrete Beams

2014 ◽  
Vol 919-921 ◽  
pp. 1396-1399
Author(s):  
Bin Lei ◽  
Hui Wu ◽  
Yu Song Yan ◽  
Chun Hua Rao
Keyword(s):  
Calculation Method ◽  
Concrete Beams ◽  
Mean Value ◽  
Recycled Concrete ◽  
Experimental Results ◽  
Variation Coefficient ◽  
Bending Test ◽  
Test Results ◽  
Bending Rigidity ◽  
The Mean

The comparison between the experimental results of bending rigidity of recycled concrete collected from the bending test carried out by domestic and overseas researchers and the calculated results by formulas from available codes is done. The results show that formulations of from available codes are not suitable for recycled concrete beams. Then, based on the factors that influence the bending rigidity of recycled concrete beams, the formulation of bending rigidity for recycled concrete beams is proposed by theory. The experimental results by this the formulation and the test results is very close, the mean value and variation coefficient of the ratio of experimental value and calculated value for recycled concrete beams is respectively 1.01 and 0.16.Keywords: recycled concrete beams;bending rigidity; deflection; formulation

scholarly journals The Effectiveness of Patient Safety Cultural Training with Mirror Method and Case Study on Nurse Understanding About Application of Patient Safety at Hospital Pekanbaru

2019 ◽  
Vol 1 (1) ◽  
pp. 11-17
Author(s):  
Awaliyah Ulfah Ayudytha Ezdha ◽  
Silvia Nora Anggreini ◽  
Dwi Elka Fitri
Keyword(s):  
Patient Safety ◽  
Standard Deviation ◽  
Mean Value ◽  
P Value ◽  
Test Results ◽  
Cultural Training ◽  
Lecture Method ◽  
The Mean

Quality development in hospitals has led to efforts to improve quality oriented towards patient safety. The purpose of this study was to compare what methods were most effective between lectures and case studies to improve nurses' understanding of the application of patient safety. The design of the research used is a mix method that is qualitative and quantitative. This research was carried out at Hospital in Pekanbaru with a sample of the study were all nurses who served at the hospital as many as 60 people. The results obtained from the study showed that the mean value of nurses 'understanding of patient safety habit after the lecture method training was 67.47 with a standard deviation of 8.320 while the mean value of nurses' understanding of the HABIT of patient safety after training in the case study method was 73.97 with a standard deviation of 6.835. The independent t test results obtained p value = 0.002. The results of this study are expected in addition to improving the understanding of nurses as well as the hospital can apply the most appropriate method so that the goals of the patient's safety goals are the quality of service can be achieved.

scholarly journals Difference in clinical crown length of maxillary central incisors and gingival display at rest and during smiling based on gender

2013 ◽  
Vol 25 (1) ◽  
Author(s):  
Nadia Atina Zaini ◽  
Rasmi Rikmasari ◽  
Lisda Damayanti
Keyword(s):  
Mean Value ◽  
Test Results ◽  
Upper Lip ◽  
Maxillary Central Incisor ◽  
Crown Length ◽  
Anterior Teeth ◽  
Incisal Edge ◽  
Occlusal Wear ◽  
The Mean ◽  
Digital Caliper

Introduction: The aim of the present study was to investigate the effect of gender on the degree of maxillary central incisors and associated gingival display when the lips are at rest and during smiling. Methods: A total of 65 subjects (40 females [61.5%]; 25 males [38.5%]) of Malaysian Malay community studied in UNPAD were included in the study. All of the subjects had all natural anterior teeth present with no caries, extreme occlusal wear, restorations, extrusion, obvious deformities, or tooth mobility. The visible portions of the maxillary central incisor, and associated gingival at rest and smiling were measured vertically from the lower border of the upper lip to the incisal edge of the incisors. The measurements were measured using an electronic digital caliper and repeated three times. The mean value was calculated and statistical analyses were performed by Student t test. Results: Outcome of the study indicated that there is marked difference statistically (p < 0.05) with the clinical crown length display at rest (CCLR). However, the clinical crown length display during smiling (CCLS) and gingival display during smiling (GD) differences is non significant (p > 0.05) between these two genders. Conclussion: Females displayed more clinical crown length of maxillary central incisors than males at rest. During smiling, no gender differences in maxillary central incisors display were recorded, however, females displayed more maxillary gingival than males.

scholarly journals EFEKTIVITAS PERSUASIF MELALUI NARASI DAN BUKTI STATISTIK TERHADAP PENGAMBILAN KEPUTUSAN MEMILIH PRODUK HANDPHONE

2017 ◽  
Vol 2 (1) ◽  
pp. 25-32
Author(s):  
Alwinansyah Farnas ◽  
Gumgum Gumelar
Keyword(s):  
Decision Making ◽  
Experimental Studies ◽  
Mean Value ◽  
Statistical Evidence ◽  
T Test ◽  
Test Results ◽  
Independent Test ◽  
The Mean ◽  
The Difference

The aim of this study was to determine whether there is a difference to the effectiveness of persuasion toward narrative and statistical evidence in making decisions selecting mobile products in adolescents. The study was conducted from September to January 2013. This study uses a method of controlled experimental studies labolatory. Analysis using t-test of the difference independent test samples from the test results obtained values F = 1461, p = 0231> 0.05 (not significant), meaning that there is no difference in the effectiveness of persuasion through narrative and statistical evidence on decision making in adolescents choose mobile products . Comparison of average (mean) persuasive narrative and persuasive statistical evidence obtained mean value 62.12 for the narrative and the mean value for the statistical proof of 60.06. Based on the results of this analysis rejected the hypothesis that there is no difference in the effectiveness of persuasion through narrative and statistical evidence for making decisions on choosing mobile products in teens. The implication of this research is to use both types of persuasive in influencing a person's decision-making in the absence of differences in effectiveness between the two.

The quantitation of thioredoxin 1 from serum as a novel means to detect breast cancer (BC).

2020 ◽  
Vol 38 (15_suppl) ◽  
pp. 557-557
Author(s):  
Kyoung Hoon Suh
Keyword(s):  
Breast Cancer ◽  
Histological Grade ◽  
Accurate Method ◽  
Mean Value ◽  
Test Results ◽  
Thioredoxin 1 ◽  
The Mean ◽  
Normal Women ◽  
Detect Breast Cancer ◽  
One Way Anova

557 Background: Breast cancer (BC) is the most common cancer and the second leading cause of cancer death in women. Enormous effort has been conducted without success to develop a means to detect BC using the blood. We have reported that the level of thioredoxin 1 (Trx1) in serum could be a novel standard to evaluate the risk of BC. Therefore, we have investigated the clinical utility of Trx1 as a biomarker to detect BC by testing sera from normal women, women with BC, women with five other types of cancer. Methods: We have developed an ELISA kit that quantitates Trx1 in sera. The level of Trx1 was determined in each serum from normal healthy women (n = 114), as well as patients with BC (n = 106), cervical cancer (n = 17), lung cancer (n = 14), stomach cancer (n = 9), and thyroid cancer (n = 4). BC patients were recruited according to their age and cancer stage. Each test was duplicated more than three times, and test results were analyzed by ROC analysis, one-way ANOVA tests, and unpaired t-tests. Results: The mean value of Trx1 from normal women was 5.60±4.39(±SD) and that from BC was 22.25±7.07. The Trx1 level was effective to distinguish BC serum from healthy serum with a sensitivity of 94.3% and specificity of 93.9% (AUC 0.985, p< 0.001). The levels of Trx1 from BC patients were higher than the cut-off value of 14.13 U/ml regardless of age, stage, histological grade, type, ER/PR/HER2 expression profile, and proliferation activity of BC cells. The levels of Trx1 from the other five types of cancers (2.34±1.82 - 3.64±2.99) were low enough to be distinguishable from BC. Especially, Trx1 levels could rescue patients whose mammography resulted in a false judgement. Conclusions: These results indicated that the blood level of Trx1 is an effective and accurate method to detect breast cancer, and particularly as a complement to mammography.

scholarly journals PENGEMBANGAN MEDIA PEMBELAJARAN BIOLOGI BERBASIS POWTOON PADA MATERI SEL

2021 ◽  
Vol 3 (2) ◽  
pp. 295
Author(s):  
Aswar Akbar ◽  
Ahmad Ali ◽  
Salahuddin Salahuddin
Keyword(s):  
Learning Style ◽  
Learning Outcome ◽  
Mean Value ◽  
Learning Activities ◽  
Test Results ◽  
Average Value ◽  
Biology Learning ◽  
The Mean ◽  
Student Test ◽  
Biological Learning

AbstrakPendidikan pada bangku persekolahan terkadang tidak bisa diterima secara totalitas oleh semua peserta didik, dikarenakan peserta didik mempunyai gaya belajar masing-masing sehingga memunculkan sebuah permasalahan dalam proses pembelajarannya, khususnya seorang guru kadang dalam proses mengajar di kelas masih sering menggunakan media papan tulis dan metode ceramah hingga membuat peserta didik merasa bosan dan tidak mampu memahami materi yang disampaikan oleh gurunya. Penelitian ini bertujuan untuk mengembangkan media pembelajaran biologi berbasis PowToon yang valid, praktis, dan efektif. Penelitian ini mengadaptasi model pengembangan 4-D yang meliputi empat tahap yakni define (pendefenisian), design (perancangan), develop (pengembangan), dan disseminate (penyebaran). Berdasarkan hasil penelitian, diketahui tingkat kevalidan media pembelajaran biologi berbasis PowToon berada pada kategori sangat valid dengan nilai rerata sebesar 3,66. Tingkat kepraktisan media pembelajaran biologi berbasis PowToon berada pada kategori sangat praktis dengan nilai rerata sebesar 3,53. Hasil tes peserta didik dikategorikan sangat efektif karena mencapai rata-rata hasil belajar 83,54 dengan interval >80). Sehingga media pembelajaran biologi berbasis PowToon layak digunakan karena memenuhi tiga kriteria yakni kevalidan, kepraktisan serta keefektifan. Media pembelajaran biologi berbasis PowToon diharapkan dapat diimplementasikan pada kegiatan pembelajaran di kelas. AbstractEducation in school is sometimes not acceptable in totality by all learners, because learners have their own learning style so that it raises a problem in the learning process, especially a teacher sometimes in the process of teaching in the classroom still often uses whiteboard media and lecture methods to make learners feel bored and unable to capture the material delivered by their teachers. This research aims to develop a valid, practical, and effective PowToon-based biological learning medium. This research adapts the 4-D development model which includes four stages namely define (defining), design (design), develop dessiminate. Based on the results of the study, it is known the the level of validity of the PowToon based biology learning media is in the valid category and the mean value is 3.66. The level of practicality of the PowToon based biology learning media is in the very practical category with an average value of 3.53 student test results are categorized as very effective because they achieve an average learning outcome of 83.54 with intervals (>80). So that the PowToon based biology learning media is feasible to use because it meets three criteria, namely validity, practicality and effectiveness. PowToon based biology learning media is expected to be implemented in classroom learning activities.

scholarly journals Peningkatan Pengetahuan Ibu-Ibu Rumah Tangga Dalam Perilaku Pengobatan Sendiri Untuk Penatalaksanaan Demam Dengan Metode Cara Belajar Ibu Aktif

2018 ◽  
Vol 1 (1) ◽  
pp. 27-30
Author(s):  
Rezqi Handayani
Keyword(s):  
Treatment Group ◽  
Mean Value ◽  
Pharmacological Therapy ◽  
Control Group ◽  
Test Results ◽  
Self Medication ◽  
Treatment Groups ◽  
Significant Difference ◽  
Level Of Knowledge ◽  
The Mean

Pharmacological therapy in fever patients is to provide Antipyretic drugs, can be done by using a doctor's prescription or by self-treatment. The condition that occurs in the community is self-medication conducted in the category of irrational treatment therapy because it is not in accordance with the condition of the patient. So, it is necessary to do education using Active Mother�s Ways of Learning Method to the housewives about rational fever self-treatment. The sample in this study were 40 housewives in the Flamboyant Bawah, divided into two major groups namely the control and treatment groups. Each group was given a pretest and posttest in a questionnaire of fever management. In the treatment group, fever drug education given before posttest by used CBIA method. The results showed an increase in knowledge of housewives from before education and after education was seen from the acquisition of grades. The mean pretest value in the control group was 74.38 and the treatment group was 69.69. Statistical test results show there was no significant difference in the mean value between the control group and the treatment group. The mean posttest value in the control group was 77.81 and the treatment group was 87.50. There was a significant difference between the mean value of the control group and treatment group. From the results of the statistical analysis showed that the level of knowledge of the treatment group given education by used the CBIA method produced a higher value than the control group that was not given education.

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