scholarly journals Optimization of Cement-Based Mortar Containing Oily Sludge Ash by Response Surface Methodology

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6308
Author(s):  
Mubarak Usman Kankia ◽  
Lavania Baloo ◽  
Nasiru Danlami ◽  
Wan Nurliyana Samahani ◽  
Bashar S. Mohammed ◽  
...  
Keyword(s):  
Experimental Study ◽  
Numerical Optimization ◽  
Absorption Rate ◽  
Oily Sludge ◽  
P Value ◽  
The Novel ◽  
Manufacturing Method ◽  
Economic Issues ◽  
Sludge Ash ◽  
Petroleum Extraction

In the industries of petroleum extraction, a large volume of oily sludge is being generated. This waste is usually considered difficult to dispose of, causing environmental and economic issues. This study presented the novel experimental method of manufacturing mortar used in civil construction by cement and oily sludge ash (OSA). The defined method was described with a logical experimental study conducted to examine a feasible manufacturing method for casting cement-based mortars by partially replacing cement with OSA. Replacement concentrations for OSA ranged from 0 to 20 percent by cement weight, while the water-to-cement (w/c) ratio was varied from 0.4 to 0.8, and the amount of sand was kept constant. The strengths and absorption rate of the mortar were monitored for 28 days. The OSA contains a crystalline structure with packs of angular grains. Because of OSA in the cement-based mortar mixtures and water-to-cement ratios, the mechanical strength was improved significantly. However, the water absorption trend increased linearly. Using variance analysis, the influence of OSA and w/c ratio on the behavior of mortar was acquired. The developed models were significant for all p-value reactions of <5%. Numerical optimization results showed that the best mixture can be obtained by replacing 8.19 percent cement with OSA and 0.52 as a ratio of w/c.

Experimental study of thermohydraulic characteristics and irreversibility analysis of novel axial corrugated tube with spring tape inserts

2020 ◽  
Vol 92 (3) ◽  
pp. 30901
Author(s):  
Suvanjan Bhattacharyya ◽  
Debraj Sarkar ◽  
Ulavathi Shettar Mahabaleshwar ◽  
Manoj K. Soni ◽  
M. Mohanraj
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Thermal Performance ◽  
Working Fluid ◽  
The Novel ◽  
Heat Exchanger Tube ◽  
Heat Transfer Augmentation ◽  
Corrugated Tube ◽  
The Impact ◽  
Exchanger Tube

The current study experimentally investigates the heat transfer augmentation on the novel axial corrugated heat exchanger tube in which the spring tape is introduced. Air (Pr = 0.707) is used as a working fluid. In order to augment the thermohydraulic performance, a corrugated tube with inserts is offered. The experimental study is further extended by varying the important parameters like spring ratio (y = 1.5, 2.0, 2.5) and Reynolds number (Re = 10 000–52 000). The angular pitch between the two neighboring corrugations and the angle of the corrugation is kept constant through the experiments at β = 1200 and α = 600 respectively, while two different corrugations heights (h) are analyzed. While increasing the corrugation height and decreasing the spring ratio, the impact of the swirling effect improves the thermal performance of the system. The maximum thermal performance is obtained when the corrugation height is h = 0.2 and spring ratio y = 1.5. Eventually, correlations for predicting friction factor (f) and Nusselt number (Nu) are developed.

scholarly journals Design and manufacture of the novel drum worm pair

2020 ◽  
Vol 103 (4) ◽  
pp. 003685042098122
Author(s):  
Jingzi Zhang ◽  
Jin’ge Wang ◽  
Kai Wang
Keyword(s):  
Contact Stresses ◽  
Primary Objective ◽  
Structure Design ◽  
Worm Gear ◽  
The Novel ◽  
Bending Stress ◽  
Manufacturing Method ◽  
Design And Manufacture ◽  
Maximum Contact ◽  
Worm Drive

Although a significant amount of research on robot joint reducer was conducted, there are few systematic investigations on a novel joint reducer adopting inner worm-gear plane enveloping drum worm drive. To satisfy the development of modular robot joint, the primary objective of this paper was to systematically investigate the drum worm drive adopted in the novel joint reducer with integrated structure of drive, transmission, and support in the following aspects: meshing theory, design, analysis, and manufacture. According to the gear meshing theory, mechanical design method, classical mechanics, finite element method, and machining principle of virtual center distance, the systematic investigations around the drum worm pair applied in the novel joint reducer were conducted including the macro and micro meshing theory, structure design, mechanical and contact properties analyses, and manufacturing method. The novel joint reducer’s integrated structure was designed, and the drum worm pair’s mechanical and contact properties analyses were conducted, which showed: (1) the worm’s bending stress and deflection, worm-gear teeth’s shear stress and bending stress as well as the maximum contact stresses were all below their corresponding allowable values; (2) the maximum contact stresses appeared at the engage-in position of the worm pair opposing to the engaging-out position where the largest contact areas appeared. Then the manufacturing of drum worm’s spiral tooth was conducted via the modified 4-axis linkage CNC grinder according to the conjugate motion. Finally the novel joint reducer’s industrial prototype was assembled. The novel joint reducer with integrated structure of drive, transmission and support was designed and manufactured for the first time. The flowchart of design and manufacture of the reducer’s drum worm pair in this process was formulated, which provides a new insight on the research of joint reducers as well as other fields.

scholarly journals PENINGKATAN PENGETAHUAN DAN SIKAP IBU PRAKONSEPSI MELALUI EDUKASI SERIBU HARI PERTAMA KEHIDUPAN: STUDI KUASI-EKSPERIMENTAL Enhancing Knowledge and Attitude of Preconception Mother through the First Thousand Days of Life Education: a Quasi-Experimental Study

2021 ◽  
Vol 16 (2) ◽  
pp. 96
Author(s):  
Betty Yosephin Simanjuntak ◽  
Anang Wahyudi
Keyword(s):  
Experimental Study ◽  
Exclusive Breastfeeding ◽  
Health Sector ◽  
P Value ◽  
Breastfeeding Initiation ◽  
Knowledge And Attitudes ◽  
Pocket Book ◽  
Quasi Experimental ◽  
Book Group ◽  
Knowledge And Attitude

Stunting is one of nutritional problem in children which the manifestation started since preconception period. Sensitive intervention is a program outside the health sector that can accelerate the improvement of nutrition, especially stunting. The purpose of this study was to increase the knowledge and attitudes of the preconception period of women regarding the fi rst 1000 days of life in order to prevent stunting. This research was a quasi-experimental study with two intervention groups. The sample was registered women, consisted of 60 women who were given education on 1000 days of life using leafl et media and 60 women using pocket book. Education was carried out by offi cers at 6 Religious Aff airs Offi ce. Women knowledge in leafl et group showed no signifi cant diff erences before and after education, especially in topics of chronic energy defi ciency (p = 0.791), anemia (p = 0.503), early breastfeeding initiation (p = 0.581), exclusive breastfeeding (p = 0.832), complementary feeding (p = 1.000), and stunting in children (p = 0.327). Among pocket book group, the increament of knowledge was better compared to leafl et group, especially in the topic of anemia (p <0.001), early breastfeeding initiation (p = 0.002), exclusive breastfeeding (p = 0.021), and stunting in children (p = 0.05). Meanwhile, the increase in attitude for all educational materials using pocket books increased with p value <0.05. Conclusion of this study was the increase in knowledge and attitudes of preconception is better in the pocket book group.

scholarly journals Short-Term Memory Comparison Of Students Of Faculty Of Medicine Pelita Harapan University Batch 2015 Between The Handwriting And Typing Method

Medicinus ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 108
Author(s):  
Caroline Widjaja ◽  
Stefanus Satria Sumali
Keyword(s):  
Experimental Study ◽  
Short Term Memory ◽  
P Value ◽  
Short Term ◽  
Typing Method ◽  
Term Memory ◽  
New Information ◽  
Study Population ◽  
The Right ◽  
Experimental Study Design

<p>Introduction : A lot of research has been done to determine if handwriting or typing note influenced short-term memory, however, the results obtained are still controversial. Therefore this study is structured to see the effect of note taking methods by handwriting and typing on short-term memory.</p><p>Aim : The aims of this study were to increase the performance of students in Faculty of Medicine Pelita Harapan University as well as providing the right and effective method of taking notes.<strong></strong></p><p>Method : Experimental study design was chosen in this study. Study population is students of faculty of medicine Pelita Harapan University batch 2015. 40 samples will be divide randomly into two, one group will take a note by handwriting and another by typing. Each group is required to watch a video about 15 minutes long.  The results were analyzed statistically using T-test.</p><p>Result : The average of  new information that can be remembered by group that take a note by handwriting significantly (p&lt;0,05) higher than group than take a note by typing with a p-value of 0,009.</p><p>Conclusion : Take a note by handwriting allows people to remember more new information than typing.</p>

scholarly journals Tensile and transverse strength of novel copolymers for denture base.

2019 ◽  
Vol S (1) ◽  
pp. 7-10
Author(s):  
Ahmed Asim Saeed Al-Ali ◽  
◽  
Ammar k. Al-Noori ◽  
Amer A. Taqa ◽  
◽  
...  
Keyword(s):  
Acrylic Resin ◽  
P Value ◽  
Transverse Strain ◽  
The Novel ◽  
Denture Base ◽  
Transverse Strength ◽  
Base Materials ◽  
Propenoic Acid ◽  
Significant Difference ◽  
Transverse Strains

Objectives: Compare tensile and transverse strength of new copolymers for denture base. Materials and methods: The specimens were prepared from heat cured acrylic resin with three types of additives: Acryester B, Ethoxycarbonylethylene, and Propenoic acid at a percentage of 5% and 10%. The tensile and transverse strains were tested, recorded and compared. Results: The analysis of variance display statistically significant difference. The p-value was 0.001 for each of tensile and transverse strain tests. Conclusions: The tensile strength of the novel copolymers increased. The transverse strength of some of the novel copolymers increased.

scholarly journals Efektivitas Tindakan Skeling terhadap Perawatan Gingivitis di Rumah Sakit Gigi dan Mulut Universitas Sam Ratulangi Manado

e-GIGI ◽  
2019 ◽  
Vol 7 (2) ◽  
Author(s):  
Febri Korompot ◽  
Krista V. Siagian ◽  
Damajanty H. C. Pangemanan ◽  
Johanna Khoman
Keyword(s):  
Experimental Study ◽  
Inflammatory Response ◽  
Periodontal Disease ◽  
Sampling Technique ◽  
P Value ◽  
Test Design ◽  
Gingival Index ◽  
Paired Sample ◽  
Before And After ◽  
Post Test

Abstract: The most common periodontal disease is gingivitis which is caused by biofilm accumulation on plaque around the gingival margin and inflammatory response to bacteria. Scaling is used to eliminate bacterial and calculus deposits that cause gingivitis. This study was aimed to determine the effectiveness of scaling in gingivitis treatment. This was a pre-experimental study with one group pre and post test design. Samples were obtained by using total sampling technique. There were 30 patients aged 17-45 years that had scaling performed on them at RSGM in 2019. Gingivitis was observed before and after scaling using the modified gingival index (MGI). The results showed that before scaling, there were mild gingivitis 23.30%, moderate gingivitis 70%, and severe gingivitis 6.70%. Two days after scaling, mild gingivitis and moderate gingivitis were observed 50% each. The paired sample t-test showed a p-value of 0.000. In conclusion, scaling is effective in gingivitis treatment based on the assessment using the modified gingival index.Keywords: gingivitis, scaling, modified gingival index Abstrak: Penyakit periodontal yang paling sering dijumpai yakni gingivitis (peradangan gingiva). Gingivitis disebabkan oleh akumulasi biofilm pada plak di sekitar margin gingiva dan respon peradangan terhadap bakteri. Tindakan untuk menghilangkan deposit bakteri dan kalkulus yang menyebabkan gingivitis salah satunya ialah tindakan skeling. Tujuan penelitian ini untuk mengetahui efektivitas tindakan skeling terhadap perawatan gingivitis. Jenis penelitian ialah pra eksperimental dengan one grup pre and post test design. Pengambilan sampel menggunakan teknik total sampling terhadap pasien yang berusia 17-45 tahun yang dilakukan tindakan skeling di RSGM pada tahun 2019 berjumlah 30 orang. Penelitian ini dilakukan dengan melihat gingivitis sebelum skeling dan setelah skeling melalui pengukuran keparahan gingiva menggunakan modified gingival index (MGI). Hasil penelitian menunjukkan bahwa sebelum skeling gingivitis ringan 23,30%, gingivitis sedang 70%, gingivitis berat 6,70%. Dua hari pasca skeling didapatkan gingivitis ringan dan gingivitis sedang sama besar yaitu masing-masing 50%. Hasil uji t berpasangan menunjukkan nilai p=0,000. Simpulan penelitian ialah tindakan skeling efektif terhadap perawatan gingivitis berdasarkan penilaian modified gingival index.Kata kunci: gingivitis, skeling, modified gingival index

Experimental study on pollutant emissions in the novel combined porous-free flame burner

Energy ◽  
2018 ◽  
Vol 162 ◽  
pp. 517-525 ◽  
Author(s):  
Seyed Amin Ghorashi ◽  
Seyed Abdolmehdi Hashemi ◽  
Seyed Mohammad Hashemi ◽  
Mahdi Mollamahdi
Keyword(s):  
Experimental Study ◽  
Pollutant Emissions ◽  
The Novel ◽  
Flame Burner

Potential genes and pathways along with immune cells infiltration in the progression of atherosclerosis identified via microarray gene expression dataset re-analysis

Vascular ◽  
2020 ◽  
Vol 28 (5) ◽  
pp. 643-654 ◽  
Author(s):  
Jing Xu ◽  
Yuejin Yang
Keyword(s):  
Differentially Expressed Genes ◽  
Immune Cells ◽  
Interaction Network ◽  
Wilcoxon Test ◽  
Differentially Expressed ◽  
P Value ◽  
The Novel ◽  
Microarray Gene Expression ◽  
Progression Of Atherosclerosis ◽  
Geo Database

Objective Atherosclerosis is a chronic inflammatory process characterized by the accumulation and formation of lipid-rich plaques within the layers of the arterial wall. Although numerous studies have reported the underlying pathogenesis, no data-based studies have been conducted to analyze the potential genes and immune cells infiltration in the different stages of atherosclerosis via bioinformatics analysis. Methods In this study, we downloaded GSE100927 and GSE28829 from NCBI-GEO database. Gene ontology and pathway enrichment were performed via the DAVID database. The protein interaction network was constructed via STRING. Enriched hub genes were analyzed by the Cytoscape software. The evaluation of the infiltrating immune cells in the dataset samples was performed by the CIBERSORT algorithm. Results We identified 114 common upregulated differentially expressed genes and 22 common downregulated differentially expressed genes. (adjust p value < 0.01 and log FC ≥ 1). A cluster of 10 genes including CYBA, SLC11A1, FCER1G, ITGAM, ITGB2, CD53, ITGAX, VAMP8, CLEC5A, and CD300A were found to be significant. Through the deconvolution algorithm CIBERSORT, we analyzed the significant alteration of immune cells infiltration in the progression of atherosclerosis with the threshold of the Wilcoxon test at p value <0.05. Conclusions These results may reveal the underlying correlations between genes and immune cells in atherosclerosis, which enable us to investigate the novel insights for the development of treatments and drugs.

scholarly journals Channa striata (Ikan Gabus) Extract and the Acceleration of Tuberculosis Treatment: A True Experimental Study

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Isa Ma’rufi ◽  
Khaidar Ali ◽  
Ign Arya Sedemen ◽  
P. Purwanto ◽  
Abu Khoiri
Keyword(s):  
Experimental Study ◽  
Intervention Group ◽  
International Health ◽  
Tuberculosis Treatment ◽  
Control Group ◽  
P Value ◽  
Chi Square ◽  
Chi Square Test ◽  
Channa Striata ◽  
True Experiment

Tuberculosis is international health problem, which is classified in Global Emergency disease since 1992. The objective of the study is to determine the effect of Channa striata extract toward the acceleration of tuberculosis treatment. The study used true experiment, in which the intervention of the study was Channa striata supplementation to respondent. In addition, Chi-square was used to analyze the data with SPSS version 22. The result is the proportion of respondent classified in negative category in intervention group within week 0, week 1, week 2, week 3, and week 4 being 10.7%, 35.9%, 56.3%, 70.9%, and 90.3%, respectively. Besides, the proportion of respondent classified in negative category in control group within week 0, week 1, week 2, week 3, and week 4 was 13.4%, 23.7%, 37.1%, 49.5%, and 68%, respectively. Based on Chi-square test, the P value of Channa striata supplementation toward the acceleration of tuberculosis treatment week 1, week 3, and week 4 is 0.045, 0.019, and 0.005 (P< α; α=0.05), respectively. It means that there were differences between Channa striata supplementation and acceleration of tuberculosis treatment among respondent. Therefore, Channa striata treatment was significantly related to the acceleration of tuberculosis recovery.

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