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北京理工大学学报 2024年

作者：广田薰周政 mersha bemnet wondimagegnehu 戴亚平北京理工大学自动化学院北京理工大学唐山研究院

借助于人工智能（artificial intelligent,AI）技术，实现教室环境下课堂教学质量的机器自动评估，是一项富有挑战性的工作。针对教学质量AI机器评估问题，介绍传统的教学质量评估方法，分析机器评估使用的相关AI技术；并以不同的评估... 详细信息

借助于人工智能（artificial intelligent,AI）技术，实现教室环境下课堂教学质量的机器自动评估，是一项富有挑战性的工作。针对教学质量AI机器评估问题，介绍传统的教学质量评估方法，分析机器评估使用的相关AI技术；并以不同的评估技术为主线，对教室环境下的AI机器评估研究进展进行详细归纳与分析，指出目前机器评估面临的挑战。

关键词：人工智能课堂教学质量评估机器评估深度学习

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我爱中华文化,我爱“一带一路”

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丝路百科 2021年第10期 36-38页

作者： [埃塞俄比亚]梅尔沙·贝姆内特·旺迪马格涅胡不详

我来自美丽的埃塞俄比亚,我叫梅尔沙·贝姆内特·旺迪马格涅胡。目前,我已经在北京留学两年了。我第一次了解中国是在我自己的国家。当时,中国正在"一带一路"倡议下帮助埃塞俄比亚建立各种基础设施,包括工业设施、环形道路、灌溉设施和... 详细信息

我来自美丽的埃塞俄比亚,我叫梅尔沙·贝姆内特·旺迪马格涅胡。目前,我已经在北京留学两年了。我第一次了解中国是在我自己的国家。当时,中国正在"一带一路"倡议下帮助埃塞俄比亚建立各种基础设施,包括工业设施、环形道路、灌溉设施和水电大坝等。由于这种密切的关系,我决定到中国北京攻读自动化专业的研究生。

关键词：水电大坝基础设施埃塞俄比亚自动化专业一带一路中华文化研究生环形道路

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Evaluation of water and ethanol extracts of Schinus molle *** immature Culex quinquefasciatus Say(Diptera:Culicidae)

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Journal of Coastal Life Medicine 2014年第6期 471-477页

作者： Kidanemariam Girmay bemnet Fikre Atsede Asmelash Biskut Getachew Emebet Tekle Nagappan Raja Department of Biology College of Natural and Computational SciencesUniversity of GondarPost Box 196GondarEthiopia

Objective:To evaluate larvicidal and pupicidal activities of aqueous and ethanol extract of different parts of Schinus molle against filarial vector,Culex quinquefasciatus(***)in the ***:The mortality rate of third,fourth instar larvae and pupal stages were tested at 20,40,60,80 and 100 mg/L of plant extract using WHO standard protocol with *** mortality rate was recorded continuously for 24,48 and 72 h post exposure period and percentage mortality was ***:Maximum percentage mortality of third instar was 83.3%in ethanol extract of mature fruit at 100 mg/L after 24 h exposure *** 48 h exposure period,93.3%percentage mortality was recorded in ethanol extract of immature fruit at 100 mg/*** 72 h exposure period,100%mortality was recorded in water extract of leaf at 100 mg/*** fourth instar larvae,maximum percentage mortality of 63.3%was recorded in water extract of mature fruit and ethanol extract of immature and mature fruit at 100 mg/L after 24 h exposure *** 48 h exposure period 86.6%mortality was recorded in ethanol extract of mature fruit at 100 mg/*** 72 h exposure period,93.3%mortality was recorded in ethanol extract of mature fruit at 100 mg/*** general immature ***,percentage mortality was increased with increase in exposure time and concentration of the plant extracts ***:From this laboratory study,Schinus molle plant parts were proved to have larvicidal and pupicidal activity against immature ***.

关键词： Schinus molle Culex quinquefasciatus Larvicidal Pupicidal Water Ethanol Extracts

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Perturbation of Wood Cellulose Synthesis Causes Pleiotropic Effects in Transgenic Aspen

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Molecular Plant 2011年第2期4卷 331-345页

作者： Chandrashekhar R Joshi Shivegowda Thammannagowda Takeshi Fujino Ji-Qing Gou Utku Avci Candace H. Haigler Lisa M. McDonnell Shawn D. Mansfield bemnet Mengesha Nicholas C. Carpita Darby Harris Seth DeBolt Gary F. Peter Biotechnology Research Center School of Forest Resources and Environmental Sciences Michigan Technological University Houghton MI 49931 USA Department-of Bioenergy Science and Technology Chonnam National University Buk-Gu Gwangju 500-757 Korea Department of Crop Science North Carolina State University 4405 Williams Hall Raleigh NC 27695 USA Department of Plant Biology North Carolina State University 4405 Williams Hall Raleigh NC 27695 USA Department of Wood Science University of British Columbia 4030-2424 Main Mall Vancouver BC V6T 1Z4 Canada Purdue University Botany and Plant Pathology 915 West State Street West Lafayette IN 47907 USA Department of Horticulture N-318 Agricultural Sciences Center University of Kentucky Lexington KY 40546 USA School of Forest Resources and Conservation 326 Newins-Ziegler Hall PO Box 110410 University of Florida Gainesville FL 32611 USA

Genetic manipulation of cellulose biosynthesis in trees may provide novel insights into the growth and development of trees. To explore this possibility, the overexpression of an aspen secondary wall-associated cellulose synthase （PtdCesAS） gene was attempted in transgenic aspen （Populus tremuloides L.） and unexpectedly resulted in silencing of the transgene as well as its endogenous counterparts. The main axis of the transgenic aspen plants quickly stopped growing, and weak branches adopted a weeping growth habit. Furthermore, transgenic plants initially developed smaller leaves and a less extensive root system. Secondary xylem （wood） of transgenic aspen plants contained as little as 10% cellulose normalized to dry weight compared to 41% cellulose typically found in normal aspen wood. This massive reduction in cellulose was accompanied by proportional increases in lignin （35%） and non-cellulosic polysaccharides （55%） compared to the 22% lignin and 36% non-cellulosic polysaccharides in control plants. The transgenic stems pro- duced typical collapsed or ＇irregular＇ xylem vessels that had altered secondary wall morphology and contained greatly reduced amounts of crystalline cellulose. These results demonstrate the fundamental role of secondary wall cellulose within the secondary xylem in maintaining the strength and structural integrity required to establish the vertical growth habit in trees.

关键词： Aspen cellulose synthesis transgenic trees xylem development cell wall lignin irregular xylem growth crystallinity.

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