近日,兰博基尼与苹果(Apple)合作,通过其增强现实(AR)技术,在线上正式发布Huracan EVO RWD Spyder,售价279.40万元(中国)。据悉,新车基于Huracan 打造而来,采用了软顶帐篷设计,动力上搭载610匹的V10自然吸气发动机,预计于2020年夏季正...近日,兰博基尼与苹果(Apple)合作,通过其增强现实(AR)技术,在线上正式发布Huracan EVO RWD Spyder,售价279.40万元(中国)。据悉,新车基于Huracan 打造而来,采用了软顶帐篷设计,动力上搭载610匹的V10自然吸气发动机,预计于2020年夏季正式交付。展开更多
近10多年来,全球学术论文大规模撤稿现象日益突出,分析撤稿论文特征,总结撤稿现象背后的规律性问题,有助于了解、识别和防范学术不端行为。基于RWD数据库,对能源学科的撤稿论文进行文献计量学研究,分析撤稿论文的整体趋势、撤稿时滞、...近10多年来,全球学术论文大规模撤稿现象日益突出,分析撤稿论文特征,总结撤稿现象背后的规律性问题,有助于了解、识别和防范学术不端行为。基于RWD数据库,对能源学科的撤稿论文进行文献计量学研究,分析撤稿论文的整体趋势、撤稿时滞、国家分布、主体类型、撤稿原因等多方面特征,对比中国、印度、美国在学术不端行为方面的差异,提出要正确认识撤稿现象,各种科研主体应协同防范和治理学术不端,重视和合理评价人工智能时代的AIGC论文等建议。研究结果为我国能源学科科研活动全流程监管提供预警信息,为学术不端行为的识别、防范和治理提供参考。In recent 10 years, the phenomenon of large-scale retractions of academic papers has become increasingly prominent worldwide. Analyzing the characteristics of retracted papers and summarizing the regularity behind the phenomenon will help to understand, identify and prevent academic misconduct. Based on RWD database, this paper conducts a bibliometric research on retracted papers in energy discipline, analyzes the overall trend, time lag, country distribution, subject types, reasons for retractions and other characteristics of retractions, compares the differences in academic misconduct in China, India and the United States, and proposes to correctly understand the retractions phenomenon. Various scientific research bodies should cooperate to prevent and control academic misconduct, attach importance to and reasonably evaluate AIGC papers and other suggestions in the era of artificial intelligence. The research results provide early warning information for the whole process supervision of energy scientific research activities in China, and provide reference for the identification, prevention and management of academic misconduct.展开更多
随钻扩眼钻井技术可在全面钻进的同时实现裸眼井段的扩径,能有效减少起下钻次数、提高钻井效率。随钻扩眼过程中领眼钻头和扩眼器上钻压、扭矩的分配与地层岩石性质、钻井参数、钻具结构等多种因素有关,因此提出能反映实际随钻扩眼过程...随钻扩眼钻井技术可在全面钻进的同时实现裸眼井段的扩径,能有效减少起下钻次数、提高钻井效率。随钻扩眼过程中领眼钻头和扩眼器上钻压、扭矩的分配与地层岩石性质、钻井参数、钻具结构等多种因素有关,因此提出能反映实际随钻扩眼过程的理论或试验方案是钻压分配规律研究的关键。为了在室内试验环境下模拟实际随钻扩眼过程,设计并进行了全尺寸随钻扩眼破岩试验。设计加工了ø215.9 mm PDC领眼钻头和扩眼直径可调(242、260 mm)的试验用扩眼器,在钻头试验台架上进行了全尺寸破岩试验,研究了随钻扩眼过程中的钻压分配规律及其受岩石类型、钻压、转速及扩眼直径的影响。试验结果表明:钻压比和扭矩比随总钻压的增大而增大,随岩石强度的减小而增大,但基本不受钻速的影响;扩眼器刀翼切削区域攻击性越强,相应的钻压比越大。所得结论可为随钻扩眼作业的钻井参数和钻具组合优化提供依据。展开更多
如果觉得四驱的车型太过安逸,无法享受后轮滑走的乐趣的话,眼前这辆来自意大利的兰博基尼Huracan EVO RWD绝对可以让你感受到肾上腺素飙升的快感.相比于普通版本的Huracan EVO来说,RWD版本可以让你在外观上就能简单的将它们区分开来。...如果觉得四驱的车型太过安逸,无法享受后轮滑走的乐趣的话,眼前这辆来自意大利的兰博基尼Huracan EVO RWD绝对可以让你感受到肾上腺素飙升的快感.相比于普通版本的Huracan EVO来说,RWD版本可以让你在外观上就能简单的将它们区分开来。在前脸上,最为明显的差异就是前保险杠的设计了.展开更多
文摘近10多年来,全球学术论文大规模撤稿现象日益突出,分析撤稿论文特征,总结撤稿现象背后的规律性问题,有助于了解、识别和防范学术不端行为。基于RWD数据库,对能源学科的撤稿论文进行文献计量学研究,分析撤稿论文的整体趋势、撤稿时滞、国家分布、主体类型、撤稿原因等多方面特征,对比中国、印度、美国在学术不端行为方面的差异,提出要正确认识撤稿现象,各种科研主体应协同防范和治理学术不端,重视和合理评价人工智能时代的AIGC论文等建议。研究结果为我国能源学科科研活动全流程监管提供预警信息,为学术不端行为的识别、防范和治理提供参考。In recent 10 years, the phenomenon of large-scale retractions of academic papers has become increasingly prominent worldwide. Analyzing the characteristics of retracted papers and summarizing the regularity behind the phenomenon will help to understand, identify and prevent academic misconduct. Based on RWD database, this paper conducts a bibliometric research on retracted papers in energy discipline, analyzes the overall trend, time lag, country distribution, subject types, reasons for retractions and other characteristics of retractions, compares the differences in academic misconduct in China, India and the United States, and proposes to correctly understand the retractions phenomenon. Various scientific research bodies should cooperate to prevent and control academic misconduct, attach importance to and reasonably evaluate AIGC papers and other suggestions in the era of artificial intelligence. The research results provide early warning information for the whole process supervision of energy scientific research activities in China, and provide reference for the identification, prevention and management of academic misconduct.
文摘随钻扩眼钻井技术可在全面钻进的同时实现裸眼井段的扩径,能有效减少起下钻次数、提高钻井效率。随钻扩眼过程中领眼钻头和扩眼器上钻压、扭矩的分配与地层岩石性质、钻井参数、钻具结构等多种因素有关,因此提出能反映实际随钻扩眼过程的理论或试验方案是钻压分配规律研究的关键。为了在室内试验环境下模拟实际随钻扩眼过程,设计并进行了全尺寸随钻扩眼破岩试验。设计加工了ø215.9 mm PDC领眼钻头和扩眼直径可调(242、260 mm)的试验用扩眼器,在钻头试验台架上进行了全尺寸破岩试验,研究了随钻扩眼过程中的钻压分配规律及其受岩石类型、钻压、转速及扩眼直径的影响。试验结果表明:钻压比和扭矩比随总钻压的增大而增大,随岩石强度的减小而增大,但基本不受钻速的影响;扩眼器刀翼切削区域攻击性越强,相应的钻压比越大。所得结论可为随钻扩眼作业的钻井参数和钻具组合优化提供依据。
