浅谈汉语－哈萨克语化学教学策略和改进

采取问卷调查法、课堂观察法、访谈等方法对新疆乌鲁木齐市达坂城区阿克苏乡中学的双语（汉语－哈萨克语）学生学习化学的障碍进行数据分析及成因分析,研究消除语言因素导致的化学学习障碍,探讨双语教学策略和改进措施．     

Comparison of distribution and habitat characteristics between an endemic and a wide-ranging cryptic species of Peromyscus on the Baja California Peninsula

Peromyscus eva and Peromyscus fraterculus are 2 morphologically similar species of the Peromyscus eremicus group occurring on the Baja California Peninsula. Due to the similarity between these 2 species, their ranges have been greatly confused; consequently, the specific habitat characteristics for each group are not well known. The goal of this study was to assess distribution ranges and characteristics of preferred habitats for P. eva and P. fraterculus in more detail. We identified taxonomy of individuals by evaluating genetic patterns produced by restriction fragment length polymorphisms (RFLPs). We evaluated the banding pattern generated by Alu I and Bam HI restriction enzymes in an 850-bp cytochrome b fragment. Consistent differences in number and size of fragments allowed for discrimination of individuals to species. The heterogeneity and evenness indexes showed that the microhabitat of P. fraterculus contained less-diverse soil types and is more homogeneous than the microhabitat of P. eva. In the state of Baja California Sur, P. eva occurs exclusively in the flat areas along the Pacific coast from the Vizcaino Desert to the south, including Margarita Island, with one small population in the Loreto area adjacent to Carmen Island. The habitats occupied by P. eva were heterogeneous (areas with friable, soft sandy soil and a low percentage of small stones). Peromyscus fraterculus occurs mostly in Baja California Norte, with some populations distributed in Baja California Sur, particularly in the western areas of the Vizcaino Desert along the mountain range, in the gulf side of the peninsula south of the city of La Paz, and in a small area on the eastern side of Sierra de Las Cruces. This species was mostly found on hard soil with high medium-size stone content.     

利用同伦微扰法和Adomian分解法求解捕食生态模型

给出了同伦微扰法和Adomian分解法的计算过程,利用同伦微扰法和Adomian分解法求解Bazykin捕食生态模型和一类带有HollingⅡ功能反应和食饵具有似Allee效应的捕食生态模型.数值仿真结果表明,与经典的Rung-Kutta法进行对比,这2种方法可用于近似求解所给模型.     

怎样成为天才?

别误会——是的,我是耶鲁大学教授,但我不是天才.当我第一次对四个已成年的孩子说起,我将要开授一门关于天才的新课程时,他们认为这是他们听到过的最滑稽的事情."你,你压根不是天才!"是的,他们说得没错.那么,为什么在十几年后的今天,我还在教授"天才课程".我新出版的著作《天才成功的隐秘》(2020)还入围了亚马逊年度精选....     

对波普尔的滥用

如果你问具有哲学头脑的研究人员——至少在英语世界是这样——为什么科学有效,他们几乎总是指向哲学家卡尔?波普尔(1902—1994)的辩护. 他们解释说,科学并不能为任何问题提供最终答案,而是满足于试图证伪事物.波普尔主义者声称,科学是摧毁谎言的无情机器.     

UFO陷阱

UFO可能很有趣,譬如51区附近名为外星公路的官方标志;UFO可能很怪异,譬如外星人会用科幻通信设备给母星打电话;但是,UFO可能也事关国家安全,譬如政府项目、阴谋与科技等等.而最终,都与人类有关.     

Recent advances in magnetic electrospun nanofibers for cancer theranostics application

Cancer theranostics is a recent concept that aims to combine in the same device diagnostic and therapeutic features. Magnetic nanoparticles(m NPs) are commonly used as a critical part of these systems due to their ability to respond to an external magnetic field. Consequently, m NPs can generate heat when an alternating magnetic field is applied and enhance image contrast in magnetic resonance. However, direct administration of m NPs intravenously or directly in the tumor can lead to undesired s...     

WHO总干事谭德塞面临挑战

<正>2019年1月2日,谭德塞(Tedros Adhanom Ghebreyesus)面临着一个生死攸关的决定。这位世界卫生组织(WHO)总干事在刚果民主共和国的布尼亚度过了除夕夜,以提高工作人员的士气——他们正对抗着有史以来第二大的埃博拉疫情。在谭德塞登上飞往乌干达的直升机,去跟乌干达常驻联合国代表鲁贡达·鲁哈卡纳(Ruhakana Rugunda)会面之前,他还必须要做一个决定——是否带走一个名叫查尔斯·卢旺加-基韦瓦(Charles Lwanga-Kikwaya)的刚果小伙子。     

紫罗兰恋爱了

<正>许多科幻作品中都会出现图灵测试。按照维基百科上的定义,图灵测试是图灵于1950年提出的一个关于判断机器是否能够思考的著名思想实验,测试某机器是否能表现出与人等价或无法区分的智能。然而,人之所以为人,不单单是靠智能来定义,还有情感这个重要元素。如果用"具不具备近似于人的情感"为标准来考核人工智能会怎样呢?下面这篇由定居在美国的印度裔女作家吉檀迦利·迪格创作的小说提出了一种设想。     

泥土的起源

<正>在地球的大部分历史中,陆地上几乎不存在任何带有泥土的东西。大约4.58亿年前,泥土终于开始堆积起来,永久改变了地球上的生命。数年前,地质学家尼尔·戴维斯(Neil Davies)前往玻利维亚,在成堆的鱼类化石中寻找答案。他想进一步了解当地那条古老海岸线的信息,这些鱼类在大约4.6亿年前曾沿着那条海岸线畅游,他想了解这些鱼是如何死亡的。