检索结果-南通市图书馆

Prediction of rock fragmentation in a fiery seam of an open-pit coal mine in India

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 2879-2893页

作者： mukul sharma Bhanwar Singh Choudhary Autar K.Raina Manoj Khandelwal Saurav Rukhiyar Department of Mining Engineering Indian Institute of Technology(ISM)Dhanbad826004India CSIR-Central Institute of Mining and Fuel Research Nagpur Research Center(Mining Technology)Nagpur440006India Institute of Innovation Science and SustainabilityFederation University AustraliaBallaratVIC3350Australia

Spontaneous combustion of coal increases the temperature in adjoining overburden strata of coal seams and poses a challenge when loading *** condition,known as hot-hole blasting,is dangerous due to the increased possibility of premature explosions in loaded ***,it is crucial to load the blastholes with an appropriate amount of explosives within a short period to avoid premature detonation caused by high temperatures of ***,it will help achieve the desired fragment *** study tried to ascertain the most influencial variables of mean fragment size and their optimum values adopted for blasting in a fiery *** on blast design,rock mass,and fragmentation of 100 blasts in fiery seams of a coal mine were collected and used to develop mean fragmentation prediction models using soft computational *** coefficient of determination(R^(2)),root mean square error(RMSE),mean absolute error(MAE),mean square error(MSE),variance account for(VAF)and coefficient of efficiency in percentage(CE)were calculated to validate the *** indicates that the random forest algorithm(RFA)outperforms the artificial neural network(ANN),response surface method(RSM),and decision tree(DT).The values of R^(2),RMSE,MAE,MSE,VAF,and CE for RFA are 0.94,0.034,0.027,0.001,93.58,and 93.01,*** parametric sensitivity analyses(MPSAs)of the input variables showed that the Schmidt hammer rebound number and spacing-to-burden ratio are the most influencial variables for the blast fragment *** analysis was finally used to define the best blast design variables to achieve optimum fragment size from *** optimum factor values for RFA of S/B,ld/B and ls/ld are 1.03,1.85 and 0.7,respectively.

关键词： Fiery seam Rock fragmentation Response Surface Method(RSM) Artificial Neural Network(ANN) Random Forest Algorithm(RFA) Multiple Parametric Sensitivity Analysis (MPSA)

Chemical composition, antibacterial and antifungal activities of Saudi Arabian Mentha longifolia L. essential oil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Coastal Life Medicine 2017年第10期5卷 441-446页

作者： Nagarjuna Reddy Desam Abdul Jabbar Al-Rajab mukul sharma Mary Moses Mylabathula Ramachandra Reddy Gowkanapalli Albratty Mohammed Center for Environmental Research and Studies Jazan UniversityJazanSaudi Arabia Department of Biotechnology College of ScienceKrishna UniversityMachilipatnamA.P.India Department of Polymer science and Technology College of ScienceAnatapuramA.P.India Department of Pharmaceutical Chemistry Faculty of PharmacyJazan UniversityJazanSaudi Arabia

Objective: To investigate the chemical composition, in vitro antibacterial and antifungal activity of Mentha longifolia L. essential oils using aqueous extract. Methods: Mentha longifolia L. essential oils were extracted using hydrodistillation with Clevenger apparatus for 3 h and the yield of the essential oil was calculated. Essential oils were qualitatively and quantitatively analyzed with gas chromatography and gas chromatography-mass spectrometer. For these essential oils, antibacterial and antifungal activity against human pathogens were evaluated. Results: Nineteen chemical constituents representing 99.72% of the essential oil were found, comprising menthone (39.55%), isopulegone (30.49%), eucalyptol (10.38%), and α-terpineol (3.15%);these were major components, and others were minor components. The essential oil showed strong antibacterial activity against Staphylococcus aureus [(35.24 ± 0.13) mm], Enterococcus faecalis [(32.12 ± 0.12) mm] and Bacillus cereus [(30.06 ± 0.04) mm], as well as antifungal activity against Aspergillus flavus [(38.02 ± 0.06) mm], Alternaria alternaria [(35.26 ± 0.12) mm], and Penicillum spp ((34.14 ± 0.02) mm)Conclusions: It seems that the essential oils derived from the Mentha longifolia L. species could be used as a natural source of antimicrobial agents.

关键词： Chemical composition Essential oil Antibacterial Antifungal Mentha longifolia L. Menthone Isopulegone Eucalyptol

页岩中未支撑裂缝导流能力实验研究——分析研究了压裂液的pH值、黏土稳定剂、页岩矿物成分和循环应力对未支撑裂缝导流能力的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

世界石油工业 2017年第6期24卷 61-68页

作者： Weiwei Wu Pratik Kakkar Junhao Zhou Rodney Russell mukul M. sharma 得克萨斯大学

页岩水力压裂过程会产生大量次生未支撑裂缝，对这些未支撑裂缝导流能力的影响因素进行研究，得出以下结论：闭合应力为5000psi时，未支撑裂缝的导流能力比支撑裂缝的导流能力低5～4个数量级；闭合应力降低，未支撑裂缝的导流能力下降... 详细信息

页岩水力压裂过程会产生大量次生未支撑裂缝，对这些未支撑裂缝导流能力的影响因素进行研究，得出以下结论：闭合应力为5000psi时，未支撑裂缝的导流能力比支撑裂缝的导流能力低5～4个数量级；闭合应力降低，未支撑裂缝的导流能力下降得更快；页岩暴露于水基压裂液中时，其未支撑裂缝的导流能力将降低一个数量级；碱性压裂液导致裂缝导流能力降低程度比中性盐水大得多，酸性盐水可使未支撑裂缝导流能力降低；胺基黏土稳定剂通过减少粘土细粉的产出来提高未支撑裂缝导流能力，但效果不理想；较高的粘土含量和较低的石英和碳酸盐含量降低了未支撑裂缝导流能力；页岩矿物成分通过控制裂缝的力学性质和流体与页岩之间的相互作用来影响支撑裂缝的导流能力；未支撑裂缝导流能力对循环应力敏感，在一个闭合应力周期后，未支撑裂缝导流能力下降80％。

关键词：页岩未支撑裂缝导流能力影响因素影响程度

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

钻井液和完井液中粒径的筛选

国外油田工程 2002年第3期18卷 22-22页

作者： Ajay Suri mukul M.sharma 刘国华华北油田分公司采油工艺研究院

为了使钻井液和完井液引起的地层损害最小化 ,桥堵剂体积必须足够大 ,使得钻井液和完井液不被挤入岩石中 ,同时桥堵剂体积也必须足够小 ,使之能够形成泥饼 ,将进入地层的泥浆中的钻屑和聚合物过滤出来。原文介绍了一种预测由钻井液和完... 详细信息

为了使钻井液和完井液引起的地层损害最小化 ,桥堵剂体积必须足够大 ,使得钻井液和完井液不被挤入岩石中 ,同时桥堵剂体积也必须足够小 ,使之能够形成泥饼 ,将进入地层的泥浆中的钻屑和聚合物过滤出来。原文介绍了一种预测由钻井液和完井液中存在的粒径大小不同的岩屑引起的地层受损深度和程度的数学模型。泥浆侵入和回流后 ,该模型对地层受损深度和渗透率损失进行了计算。

关键词：油井钻井液完井液桥堵剂粒径选择地层损害

炭纤维/氨基化多壁碳纳米管/环氧树脂复合材料力学性能的分子模拟( 英文)

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

新型炭材料 2014年第2期29卷 132-142页

作者： Kamal sharma mukul Shukla Mechanical Engineering Department Motilal Nehru National Institute of Technology Allahabad Uttar Pradesh 211004 India Department of Mechanical Engineering Technology University of Johannesburg Johannesburg South Africa

采用分子动力学模拟(MD)分析炭纤维/氨基化多壁碳纳米管/环氧树脂复合材料的力学性能。采用碳纳米管作为环氧树脂的主要增强材料以期提高三相复合材料的力学性能。建立固化的环氧树脂模型以提高碳纳米管和基体间的粘结强度。炭纤维体积... 详细信息

采用分子动力学模拟(MD)分析炭纤维/氨基化多壁碳纳米管/环氧树脂复合材料的力学性能。采用碳纳米管作为环氧树脂的主要增强材料以期提高三相复合材料的力学性能。建立固化的环氧树脂模型以提高碳纳米管和基体间的粘结强度。炭纤维体积分数设定为60%,碳纳米管体积分数为0.25%-5%。结果表明,碳纳米管体积分数从0.25%增加至5%时,沿炭纤维方向上的杨氏模量由92GPa提高至224.4GPa,抗张强度由1.35GPa提高至2.85GPa。

关键词：炭纤维分子模拟三相碳纳米管力学性能

A review on re-emerging bacteriophage therapy in the era of XDR

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

生物细胞(英文) 2023年第9期47卷 1915-1930页

作者： POOJA BHADORIYA RICHA sharma REKHA MEHROTRA SIMRAN KAUR ISHA SRIVASTAVA mukul JAIN PRASHANT KAUSHIK Department of Microbiology Shaheed Rajguru College of Applied Sciences for WomenUniversity of DelhiVasundhara EnclaveNew Delhi110096India Lab-209 Cell&Developmental biology labCenter of Research for DevelopmentParul UniversityVadodara391760GujaratIndia Instituto de Conservacióny Mejora de la Agrodiversidad Valenciana Universitat Politècnica de ValènciaValencia46022Spain

In the present medicine world antibiotic resistance is one of the key threats to universal health *** continue to work hard to combat this global health *** therapy,an age-old practice during the early twentieth century,was outshined by the discovery of *** the advent of widespread antibiotic resistance,phage therapy has again redeemed itself as a potential alternative owing to its adeptness to target bacteria *** side effects,the ability to migrate to different body organs,a distinct mode of action,and proliferation at the infection site,make phages a profitable candidate to replace conventional *** progressive outcome of numerous in vitro studies and case reports has validated the clinical efficacy of phage *** bright perspective of using phages to treat bacterial infections has fueled enormous medical research to exploit their potential as *** gaps in the information about phages and the lack of consent for clinical trials is major hurdle for consideration of phage *** phage therapy as a reality in medicine requires a coordinated effort from different *** this review,we aim to emphasize the importance of phage therapy in modern *** review explains their historical journey,basic phage biology,cross-talk with the host immunity,obstacles with phage therapy,and their possible *** data on the various significant clinical trials of phage therapy has been *** evaluated the efficacy of antibiotics and phage therapy in part and in combination,along with recent progress and future perspectives of phage therapy.

关键词： Bacteriophages Antibiotic resistance Phage biology Phage therapy Phage therapy clinical trials Phage therapy in India