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关键词： 农业机械   机械工程   机电一体化系统  

摘要： 在当今社会经济与科学技术的协同发展下,机电一体化系统已经在机械工程中得到了广泛应用。而在农业机械工程中,机电一体化系统更是发挥着十分显著的应用优势。通过该系统的应用,不仅让农业机械实现了运行效率的显著提升,同时也使其更具稳定性,让农业机械操作故障率得以显著降低。基于此,本文就对农业机械工程中的机电一体化系统应用策略进行分析,以此来为该系统的应用与农业机械工程发展提供科学参考。

关键词： 机械工程   自动化设备   安装技术  

摘要： 这些年,我国的机械工程自动化水平不断提高,智能化与自动化在我国发展的许多方面愈发凸显。这既体现出了我国机械工程自动化的重要性,也增强了我国人民对机械工程自动化的关注。因此,相关的工作人员需要积极推动我国机械工程自动化技术与现代发展相融合,加强对机械工程自动化的管理,积极以运行数据作为对机械工程自动化使用情况的参考。同时,相关的工作人员还要积极推动相关的法律法规的建立,为机械工程自动化的应用提供保障。

关键词： 机械工程  

ISBN: (纸本)9787576301847

摘要： 本书共分5章，内容包括：绪论，控制系统的数学模型，控制系统的时域分析，控制系统的时域分析，控制系统的综合与校正。

关键词： 机械工程  

ISBN: (纸本)9787302582656

摘要： 本书共12章，主要包括刚性体建模、运动副与驱动、施加载荷、动力传动子系统(齿轮、皮带、链条、轴承、电机和绳素)、柔性体建模、仿真计算与结果后处理、ADAMS/View中的函数、数据元素与系统元素、参数化设计与优化分析、建立控制系统、振动仿真分析等内容。

关键词： 一带一路   机械专业留学生   机械工程概论   全英文教学  

摘要： 机械设计制造及其自动化专业留学生课程《机械工程概论》来源并延伸于机械设计制造及其自动化专业的中国学生课程《机械工程专业英语》。这是留学生进入这个专业领域的第一门课，重点在于通过学习这门课程，对本专业领域和前沿的发展有一定了解，并产生专业兴趣。为后续的专业学习做铺垫。课本里的所有内容对于留学生来说是全新的，他们刚接触机械工程这个领域，对于这个领域没有任何相关的认识，不了解任何专业词汇。对留学生，必须对每一篇课文里出现的有关专业知识点展开来讲述，甚至对课文里出现的每一个相关的机械工程专业词汇进行详细解释。另外留学生的这门课程必须将理论讲授和实践结合起来，即带领留学生到相关企业和工厂进行参观实习。

关键词： metabolism   engineering   fatty alcohols   gene expression regulation   genes   genome   oncogenes   pichia   recombination   genetic   yeasts   genetics   crispr-cas9   genome editing  

摘要： The industrial yeast Pichia pastoris has been harnessed extensively for production of proteins, and it is attracting attention as a chassis cell factory for production of chemicals. However, the lack of synthetic biology tools makes it challenging in rewiring P pastoris metabolism. We here extensively engineered the recombination machinery by establishing a CRISPR-Cas9 based genome editing platform, which improved the homologous recombination (HR) efficiency by more than 54 times, in particular, enhanced the simultaneously assembly of multiple fragments by 13.5 times. We also found that the key HR-relating gene RAD52 of P pastoris was largely repressed in compared to that of Saccharomyces cerevisiae. This gene editing system enabled efficient seamless gene disruption, genome integration and multiple gene assembly with positive rates of 68-90%. With this efficient genome editing platform, we characterized 46 potential genome integration sites and 18 promoters at different growth conditions. This library of neutral sites and promoters enabled two-factorial regulation of gene expression and metabolic pathways and resulted in a 30-fold range of fatty alcohol production (12.6-380 mg/I). The expanding genetic toolbox will facilitate extensive rewiring of P. pastoris for chemical production, and also shed light on engineering of other non-conventional yeasts.

摘要： This study investigates the use of multiword constructions in published and student research articles in mechanical engineering and manufacturing (ME), a discipline characterized by a large population of second language users of English and a paucity of academic writing guidance for apprentice writers. Using the pattern grammar-based approach to constructions, a wide range of multiword constructions are examined from four perspectives: grammar patterns, key lexical components of grammar patterns, multiword constructions (operationalized as grammar pattern-meaning pairings) and construction-rhetorical function associations. This approach provides a complementary perspective to existing phraseological constructs, effectively extends the scope of construction grammar research, and reveals certain form-function associations in academic written *** on a corpus of published research articles and a corpus of student research articles in ME, the study compiles a genre- and discipline-specific list of commonly-used grammar patterns with words most strongly associated with the patterns, makes a comparative analysis of the use of multiword constructions in published and student research articles, and explores the variations in the use of multiword constructions across English as a first language (L1-English), English as a second language (ESL) and English as a foreign language (EFL) graduate students. The effects of token frequency, rhetorical strategy and language acquisition context on the use of multiword constructions in academic writing are discussed. Pedagogical applications, methodological values and the development of academic English constructicon are also considered.