JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa)最新文献

Growth and Yield of Brassica oleracea in Response to Phosphorus Fertilizer Application 施用磷肥对甘蓝生长和产量的影响

JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa) Pub Date : 2022-03-17 DOI: 10.17758/iicbe3.c0322262

N. Mfeka, M. Tanga, Adewole T Adetunji, F. Lewu

引用次数: 0

Thermal Processing of Sodium sulphate to Sodium carbonate 硫酸钠制取碳酸钠的热加工

JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa) Pub Date : 2022-03-17 DOI: 10.17758/iicbe3.c0322248

Lehlogonolo Mashigwana, J. Maree, Lizzy Monyatse, A. Adeniyi, Maurice, Onyango

{"title":"Thermal Processing of Sodium sulphate to Sodium carbonate","authors":"Lehlogonolo Mashigwana, J. Maree, Lizzy Monyatse, A. Adeniyi, Maurice, Onyango","doi":"10.17758/iicbe3.c0322248","DOIUrl":"https://doi.org/10.17758/iicbe3.c0322248","url":null,"abstract":" Abstract — Mine water is environmentally toxic due to high metal concentrations. Strict legislation is enforced. Water of drinking quality needs to be produced and zero waste should be left at the mine site. The ROC (Reverse osmosis/Cooling) process can meet these requirements. In the ROC process, Na 2 CO 3 is used in the pre-treatment stage for selective recovery of metal compounds, such as Fe(OH) 3 at pH3.5, followed by reverse osmosis for recovery of drinking water and brine containing 90 g/L Na 2 SO 4 . In the sub-sequent cooling stage, Na 2 SO 4 .10H 2 O is removed through cooling, due to its low solubility of 45 g/L at 0°C. The purpose of this investigation was to investigate the thermal conversion of the product, Na 2 SO 4 .10H 2 O, to the raw material, Na 2 CO 3 . It was found that (i) Na 2 SO 4 .10H 2 O can be converted to Na 2 SO 4 though heating between 60°C and 100°C, (ii) Na 2 SO 4 cannot be converted directly to Na 2 S, as the raw material, Na 2 SO 4 , melts in the same temperature region where the reduction takes place, namely above 860°C, (iii) Na 2 S can be produced via CaS (indirect method) (Pyrusim simulation studies) and (iv) Na 2 S can be converted to NaHS, NaHCO 3 and Na 2 CO 3 (OLI simulation","PeriodicalId":426472,"journal":{"name":"JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124669933","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}

引用次数: 0

Volatile Oil Composition of Burdock Root (Arctium lappa L.) in Response to Mineral Fertilizer Application 牛蒡根挥发油成分对矿肥施用的响应

JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa) Pub Date : 2022-03-17 DOI: 10.17758/iicbe3.c0322255

M. Tanga, F. Lewu, A. Oyedeji, O. Oyedeji

{"title":"Volatile Oil Composition of Burdock Root (Arctium lappa L.) in Response to Mineral Fertilizer Application","authors":"M. Tanga, F. Lewu, A. Oyedeji, O. Oyedeji","doi":"10.17758/iicbe3.c0322255","DOIUrl":"https://doi.org/10.17758/iicbe3.c0322255","url":null,"abstract":" Abstract — This study was undertaken to determine the changes that occur in volatile oil composition of cultivated burdock root as influenced by mineral fertilizer application in the Wine Land Region of the Western Cape province of South Africa. Harvested dry roots from different treatments was used for oil extraction by hydro distillation and the composition of the oil from the different treatments was determined by GC/MS. In total, T 7 recorded the highest number of compounds (20) with 7 of the compounds of peak% over 5. While T 3 had 19 compounds with 6 of the compounds of peak% over 5. However, T 4 , T 5 , T 6 and T 8 , recoded 14 compounds. Nevertheless, T 1 and T 2 had the least number of compounds with 5 compounds of peak % over 5 for T 1 and 4 compounds for T 2. Overall, the two treatments T 3 and T 7 with the highest number of compounds were treatments with less supplementary 1058 P 280 K 315 ) Kg/ha. Fertilizer treatments for the experiments were split into two equal doses at seedling transplant and at four weeks after transplant. Irrigation and weeding were conducted as required throughout the cultivation period with all protocol diligently","PeriodicalId":426472,"journal":{"name":"JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa)","volume":"30 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120873337","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}

引用次数: 0

The Effect of Cut-off Grade and Mine Value Optimization on Mining Projects in South African Mines: A Mini-review 边界品位和矿山价值优化对南非矿山开采项目的影响:一个小回顾

JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa) Pub Date : 2022-03-17 DOI: 10.17758/iicbe3.c0322209

Ofentse Ramphore, E. Fosso-Kankeu, H. Grobler

引用次数: 0

The Effects of Varying pH and Shading on Antioxidant Content-and -capacity of Tulbaghia violacea Cultivated Hydroponically under Greenhouse Conditions 不同pH和遮荫条件对温室水培紫杜鹃抗氧化含量和抗氧化能力的影响

JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa) Pub Date : 2022-03-17 DOI: 10.17758/iicbe3.c0322257

W. Ncise, C. Daniels, N. G. Etsassala, F. Nchu

{"title":"The Effects of Varying pH and Shading on Antioxidant Content-and -capacity of Tulbaghia violacea Cultivated Hydroponically under Greenhouse Conditions","authors":"W. Ncise, C. Daniels, N. G. Etsassala, F. Nchu","doi":"10.17758/iicbe3.c0322257","DOIUrl":"https://doi.org/10.17758/iicbe3.c0322257","url":null,"abstract":" Abstract — Environmental stress factors such as high or low soil pH, water deficit, high temperature, and shade may induce accumulation of reactive oxygen species in plants, which may lead to oxidative stress when in excess. The effects of varying the environmental variables such as pH and light intensity on secondary metabolite contents and the antioxidant capacity of extracts of T. violacea under greenhouse conditions, with the aim of improving the hydroponic cultivation of T. violacea , were assessed. In this study, six weeks old seedlings of T. violacea were separately exposed to two levels of light intensity and two levels of pH (4 and 8) in a greenhouse. The total polyphenol, alkaloid, and flavonol contents and antioxidant activities in the leaf and bulbous root extracts were determined using spectrophotometric methods. The total polyphenol contents of the leaves were significantly higher (df = 1, 4; P < 0.05) in plants under 40% shading and pH 8 compared with 0% shading and pH 4, respectively. Although generally, higher total polyphenol and flavonol contents occurred in the roots than in the leaves, the roots had a significantly (P < 0.05) reduced flavonol content compared with the leaves of plants in the 40% shade treatment. The antioxidant activity was more pronounced in the leaf extract from plants maintained under 40% shade or pH 8 than 0% shade or pH 4, respectively. In conclusion, 40% shading and high pH (pH 8) correlated with a high accumulation of antioxidants and antioxidant activities in T. violacea","PeriodicalId":426472,"journal":{"name":"JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125789759","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}

引用次数: 0

Evaluating the Effect of Beauveria bassiana on Secondary Metabolite Contents and Green Peach aphid (Myzus persicae) Infestation Level on lettuce (Lactuca sativa L.) 球孢白僵菌对生菜次生代谢物含量及青桃蚜侵染水平的影响

JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa) Pub Date : 2022-03-17 DOI: 10.17758/iicbe3.c0322258

Neo Macuphe, N. G. Etsassala, E. Akinpelu, O. Oguntibeju, Felix, Nchu

{"title":"Evaluating the Effect of Beauveria bassiana on Secondary Metabolite Contents and Green Peach aphid (Myzus persicae) Infestation Level on lettuce (Lactuca sativa L.)","authors":"Neo Macuphe, N. G. Etsassala, E. Akinpelu, O. Oguntibeju, Felix, Nchu","doi":"10.17758/iicbe3.c0322258","DOIUrl":"https://doi.org/10.17758/iicbe3.c0322258","url":null,"abstract":" Abstract — Endophytic fungus play a crucial role in protecting food crops against phytophagous insects through endophytism. In this greenhouse study, two sets of potted lettuce plants were inoculated with one of four fungal conidial concentrations: 0, 1 × 10 6 , 1 × 10 7 , and 1 × 10 8 conidia mL -1 . The first set of plants was used to test the effect of B. bassiana inoculation on aphid infestation levels on lettuce in meshed boxes. The second set of plants was used for assessing the effects of fungal inoculation on secondary metabolite contents. The results showed that the fungus did not significantly (P > 0.05) affect insect infestation levels. However, total polyphenol contents varied significantly with conidial concentrations. The GC-MS analysis detected a wide range of volatile compounds, with two well-known insect repellents, 3-octanol and 2,4-di-tert-butyl-phenol, occurring at significantly (P < 0.01) higher concentrations in the fungus-treated plants than the control plants. In conclusion, B. bassiana inoculation significantly enhanced polyphenol content and the quantities of some volatile","PeriodicalId":426472,"journal":{"name":"JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133297442","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}

引用次数: 0

Carbon Dioxide Hydrate Inhibition and Energy Requirements in Systems Relevant to Gas Hydrate-based Fruit juice Concentration 与天然气水合物果汁浓度相关的系统中的二氧化碳水合物抑制和能量需求

JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa) Pub Date : 2022-03-17 DOI: 10.17758/iicbe3.c0322277

引用次数: 0

Blue Energy from Southern African Water Bodies : State -of-the-art, Challenges and Opportunities 来自南部非洲水体的蓝色能源:最新技术、挑战和机遇

JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa) Pub Date : 2022-03-17 DOI: 10.17758/iicbe3.c0322269

K. Tumba

{"title":"Blue Energy from Southern African Water Bodies : State -of-the-art, Challenges and Opportunities","authors":"K. Tumba","doi":"10.17758/iicbe3.c0322269","DOIUrl":"https://doi.org/10.17758/iicbe3.c0322269","url":null,"abstract":"— In Southern Africa, the energy sector is characterised by the extensive use of coal fired power plant as well as fossil fuels. This causes environmental pollution and increased greenhouse gas emissions thereby contributing to global warming. Although solar and wind energy have emerged as major contributors to the renewable energy mix in Southern Africa, it is still necessary to diversify energy sources, with emphasis on those offering advantages beyond efficiency and renewability. Salinity gradient energy (SGE) or blue energy is one such form. Blue energy of which reverse electrodialysis (RED) represents the most attractive form is a type of marine or oceanic energy generated by mixing two water streams of different salinities. It involves the use of ion exchange membranes in an electrochemical process. The aim of the present article is to evaluate progress made in Southern Africa in the production of electricity by reverse electrodialysis. After providing some background information on RED, challenges and opportunities associated with future electricity generation in Southern Africa by RED at industrial scale were also examined. The findings revealed the inexistence of a single RED-based power plant in Southern Africa. However, it is important to mention the huge potential in blue energy provided by the numerous rivers, streams, lakes and oceans found in this region. It is concluded that future studies should focus on applying the technology to the region by training a critical mass of local researchers, a more accurate evaluation of the potential of each country to use blue energy and innovation related to the use of blue power as well as the socio-economic evaluation of integrating electricity production with some processes such as wastewater treatment, desalination and sodium hydroxide production.","PeriodicalId":426472,"journal":{"name":"JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133287117","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}

引用次数: 0

Growth Traits and Carcass Characteristics of Broiler Birds Fed Brewer’s Spent Grain 啤酒废粮饲喂肉仔鸡的生长性状和胴体特性

JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa) Pub Date : 2022-03-17 DOI: 10.17758/iicbe3.c0322261

C. Oyeagu, E. A. Akuru, Lilian Ugwuanyi, Adewole T Adetunji, F. Lewu

引用次数: 0

A Biopolymer-based Nanocomposite as a Multifunctional Sustainable Material for Water Pollutants Degradation 生物聚合物基纳米复合材料作为水污染物降解的多功能可持续材料

JCBEE-22 Mar. 17-18, 2022 Johannesburg (South Africa) Pub Date : 2022-03-17 DOI: 10.17758/iicbe3.c0322245

Anny Leudjo Taka, Sandra Ngningone Obiang, X. Mbianda, M. Klink, F. Mtunzi

引用次数: 0