Journal of Chemistry: Education Research and Practice最新文献

{"title":"Process for Concentration of Low Grade Copper Ore – A Process Design","authors":"","doi":"10.33140/jcerp.07.01.04","DOIUrl":"https://doi.org/10.33140/jcerp.07.01.04","url":null,"abstract":"The paper deals with the results of characterisation and flotation studies carried out on a low grade and complex copper ore sample with a view to design process for its concentration. Flotation studies were carried out under varying conditions of process parameters. Effects of granulometry of the feed, dosage of sodium iso-propyl xanthate as collector, pH and gangue depressant/dispersant were studied. Sulphidization technique and use of potassium octyl hydroxamate as auxiliary collector for flotation of oxidised minerals were observed to enhance copper recovery. Use of sodium silicate as depressant/dispersant for siliceous gangues helped in improving grade of copper concentrate. Rougher followed by multi-stage cleaning were found necessary to produce a high grade copper concentrate. Based on the studies undertaken the process was designed for concentration of the low grade copper ore sample.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133908074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ab Initio Determination of Molecular Geometry and Vibrational Frequencies of Benzotrifluoride","authors":"A. Kushwaha, R. Prasad, R. Yadav","doi":"10.33140/jcerp.07.01.03","DOIUrl":"https://doi.org/10.33140/jcerp.07.01.03","url":null,"abstract":"Using Gaussian 05 Revision C.02 version of the quantum chemical program ab initio computations has been carried out to compute optimized geometry, harmonic vibrational frequencies along with intensities in IR and Raman spectra and atomic charges at rhf / 6–31+g*, b3lyp / 6–31++g** and b3lyp / 6–311++g** levels. The optimized molecular structure is found to possess Cs point group symmetry with the plane of symmetry passing through the C atom, to which the CF3 group is attached, the centrally opposite C atom and the C atom of the CF3 group and perpendicular to the phenyl ring plane. One of the three F atoms of the CF3 group is found to be on one side of the ring plane and is situated on the plane of the symmetry while the other two F atoms are found to be on the other side of the ring plane placed symmetrically on either side of the symmetry plane. Vibrational assignments for the normal modes have been reviewed. To make vibrational assignments for the normal modes of vibration the Gauss View software was used. The CF3 group has the characteristic frequencies in the 340, 768, 1072, 1152 and 1318 cm-1 which are due to the modes δs (CF3), Vs (CF3 ), Vas(CF3) (a’), Vas(CF3) (a”) and V(C–CF3 ) respectively. The torsional frequency of the CF3 group is found to be 16 cm-1 which would lead to barrier height of ~ 0.5 kJ / mol for the torsional motion of the CF3 group.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131974055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Art of Writing Flowchart in Organic Chemistry Practicals Induces Logical Thinking in Chemistry Students","authors":"","doi":"10.33140/jcerp.07.01.02","DOIUrl":"https://doi.org/10.33140/jcerp.07.01.02","url":null,"abstract":"In this article we present an art of writing flowcharts in organic chemistry preparation practicals. We divided students into two groups. One group of students was trained to write procedural flowchart and the other group of students was educated to write chemical flowchart for the preparation of p-nitroacetanilde from acetanilde and preparation of hippuric acid from glycine. The procedural flowchart simply represents the steps involved in an organic preparation. While, chemical flowchart describes chemical species involved in each step of preparation. We found that students educated to write chemical flowchart have gained superior knowledge in chemistry over the students who were trained to write procedural flowchart.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"179 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132531629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of Epoxy/Graphite Nanocomposite Based TiO2 and ZnO Nanoparticles as Bipolar Plate for PEMFC","authors":"","doi":"10.33140/jcerp.07.01.01","DOIUrl":"https://doi.org/10.33140/jcerp.07.01.01","url":null,"abstract":"In this study, a polymer/graphite nanocomposite bipolar plate was prepared through bulk molding process. Nanoparticles of metal oxide such as zinc oxide (ZnO) and titanium dioxide (TiO2 ) were added to composite as secondary fillers. Epoxy resin was chosen because of its low cost and easy fabrication through bulk molding. In these nanocomposites, the percentage of resin was constant while graphite and nanoparticles were variable. The conductivity and mechanical properties of these composite were studied by standard test methods. The obtained results showed that the nanocomposites prepared with a high percentage of nanoparticles have the highest flexural strength. Scanning electron microscopy (SEM) showed that fillers disperse well in the matrix","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130705303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Studying the Effect of Propionibacterium and Acetic Acid on Candida Albicans Contaminating Chicken Fillet in Chilling Conditions","authors":"","doi":"10.33140/jcerp.06.02.15","DOIUrl":"https://doi.org/10.33140/jcerp.06.02.15","url":null,"abstract":"Raw meat spoilage by yeasts is a significant problem that is a consequence of many yeast species growth in the product including Candida albicans. Candida albicans utilizes food components and are transformed into many metabolic end products leading to sensory, chemical and physical properties changes with especial reference to the health impacts on the consumer's health. Therefore, the current experimental study aimed to investigate the inhibitory effect of two vital food additives (Propionibacterium and acetic acid) at four different concentrations (0.5, 1.0, 2.5 and 5%) on C. albicans including recording their impact on the sensory characters of the treated chicken fillet samples in chilling conditions (4±1OC): After physical and microbial examination for nine days of storage, results showed significant improvement in the sensory characters of the treated samples, especially with increasing the concentration of the tested additives when compared with the control untreated samples which was spoiled at the 9th day of inoculation. Regarding with the anti-C. albicans effect of the tested materials, in general, C. albicans showed higher reduction percent with increasing the concentration of the inoculated additives; furthermore, the treated samples with 2.5% and 5.0% acetic acid, after nine days of inoculation, showed more reduction in C. albicans counts (70.7% and 87.2%, respectively) than the treated samples with Propionibacterium of the same concentration (41.4 and 52.7%, respectively): Referring to the obtained results, Propionibacterium and acetic acid of the 2.5% and 5.0% concentration could be considered a good choice for preservation and enhancing quality of chilled chicken fillet, and may be recommended for its usage in chicken fillet preservation as safe and easy applied food additives.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"177 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133720015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Digital Model of Mechanical Interaction and its Application","authors":"","doi":"10.33140/jcerp.06.02.14","DOIUrl":"https://doi.org/10.33140/jcerp.06.02.14","url":null,"abstract":"A digital model of mechanical interaction is proposed, in which the motion of virtual objects in one-dimensional space is determined by their information content. The correspondence of the mathematical description of motion in the digital model to the physical laws is shown. Using a digital model of mechanical interaction, a method for calculating the reaction to the interaction in reflex intelligent systems is proposed. A brief description of the response to the interaction of reflex intelligent systems created using the method of calculation is given. Their effectiveness in solving problems of natural language communication, forecasting, management, expert evaluation, etc. is shown.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"472 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127124085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sources, Microbial Interaction and Available Strategies for Remediation of Heavy Metals","authors":"","doi":"10.33140/jcerp.06.02.05","DOIUrl":"https://doi.org/10.33140/jcerp.06.02.05","url":null,"abstract":"High concentrations of heavy metals (Cadmium, Arsenic, Chromium, Lead, Mercury, Copper, Cobalt, Zinc, Nickel, and Selenium) in soil are threat to the ecosystem, human health, food safety, animal health. Heavy metal contaminants are increasing rapidly due to industrialization especially automobile industry. Previously, various techniques were developed and improved over time like encapsulation, surface capping, landfilling, soil washing, soil flushing, electro kinetic extraction, solidification, stabilization, phytoremediation, and bioremediation. These techniques minimize the contaminants by utilizing immobilization, containment and removal mechanisms. Bioremediation is a promising technique that utilizes the capability of plants and microbial resources for decontamination of ecosystem from heavy metal contaminants. Microbes have shown capability to utilize heavy metal remediation and assist plant tolerance for heavy metal accumulation. Earlier published studies have not yet completely evaluated proficiencies to large scale however, in the present review, critical analysis of reported techniques focusing on the bioremediation have been discussed. In depth analysis for the heavy metal remediation is of paramount importance of heavy metal contaminant emerging issue of soil pollution.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124037841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating the Impact of Modern Energy Access on the Social-Economic Situation of Households in Turkey","authors":"","doi":"10.33140/jcerp.06.02.04","DOIUrl":"https://doi.org/10.33140/jcerp.06.02.04","url":null,"abstract":"This study investigated the correlation between access to modern energy systems and the socioeconomic condition of families in Turkey. For this purpose, a survey was prepared for the urban residents. Based on statistical calculations, the sample size found to be 214 households with an acceptable error rate of 6.7% and a confidence level of 95%. The survey asked questions such as education level, income level, monthly consumed electrical energy, and natural gas consumption of the people living in the household. The results show that the level of access to modern energy systems varies according to the income levels and education levels of the households living in urban areas. It was observed that in the city center, where access to electricity is not lacking, the inadequacy of households' access to electricity was only due to income differences. In addition, a direct correlation revealed that fossil fuels and their derivatives are consumed more by low-income and low-education households.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123933213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of Factors Affecting Practice Towards HIV/AIDS Among In-School Youth in the West Guji Zone, South Ethiopia, 2021","authors":"","doi":"10.33140/jcerp.06.02.01","DOIUrl":"https://doi.org/10.33140/jcerp.06.02.01","url":null,"abstract":"Back Ground: Human immune deficiency virus was a worldwide pandemic, yet there is no proven medicine and vaccine to cure or prevent it. Prevention is only the mainstay to control the spread of the virus. Thus, continuously assessing factors affecting prevention practice towards HIV among young populations is relevant. Methods: This cross sectional study design was conducted from December 01/2020 To January 01/2021. The multistage sampling technique was used and a total of 615 participants were enrolled. Epi-Data version 4.4.3.1 for data entry and SPSS Version 25 for analysis was used in this study. Descriptive statistics; frequency, percent and inferential statistics were needed. Statically significance cut point settled at p < 0.05 with 95% confidence intervals. Results: Out of the 615 participants, 586 were completed the questionnaires in which 95.3% of respondents rate. The overall scores of poor knowledge, unfavorable attitude, and unsafe practice in the current study were 25.1%, 27.5%, and 24.2%. Of all study subjects; 38.7% were undifferentiated HIV from AIDS and 20.1% of them were wrongly reported as HIV/AIDS was a curable disease. Slightly more than half 51.5%, 28.2%, and 19.3% of the respondents were misbelieved that HIV transmitted by mosquito bit, eating food cooked by HIV positive person, and handshaking respectively. Early practice sexual activity at age < 15 years old was reported by 70(50.4%) and mean age for the first sex was (15.68 + 2.13SD). Females were 71.6% time more likely protect AOR = 0.284, 95% CI = 0.18-0.43), Age group 15-19 (AOR = 4.69, 95%CI =2.33-9.42), singles in marital status (AOR= 7.03, 95%CI =3.19-15.52), Visiting sexual related video (AOR= 0.202, 95CI = 0.11-0.38) and sharing sharp (AOR= 0.089, 95%CI = 0.04-1.21) were factors significantly associated. Conclusion: Misbelieve regarding ways of HIV transmission, level of knowledge, and practice gap were identified in this study. Being male, age group 15-19, single, visiting sexual related video, and sharing sharp materials were factors affecting practices towards HIV. As a result, continuous age-appropriate youth-friendly health services emphasized HIV risk behavior reduction should be given to the youth. In addition, all stakeholders including health care institutions, education institutions, and mass-medias give strong concern to alleviate misconceptions around HIV/AIDS.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125832220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Investigation on the Effect of Deep Cryogenic Treatment on 100Cr6 Bearing Steel","authors":"","doi":"10.33140/jcerp.06.02.13","DOIUrl":"https://doi.org/10.33140/jcerp.06.02.13","url":null,"abstract":"Cryogenic treatment is the process of cooling a material to extremely low temperatures to generate enhanced mechanical and physical properties. The present investigation examines the effect of deep cryogenic treatment on the enhancement of mechanical properties, such as wear resistance, corrosion resistance, tensile strength and impact strength of the plunger material 100Cr6 bearing steel. The improvement in the wear resistance, corrosion resistance, tensile strength and impact strength of the deep cryogenically treated samples over the conventionally heat-treated ones, is 50%, 26%, 13% and 27% respectively. This study suggests that the formation of very small carbides dispersed in the tempered martensite structure, can be the main reason for the enhancement of certain mechanical properties, along with the retained austenite transformations.","PeriodicalId":262953,"journal":{"name":"Journal of Chemistry: Education Research and Practice","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127289661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}