Results 51 to 60 of about 489,650 (137)
Zhongguo youzhi旨在为油脂中卤代甲烷的测定提供技术支撑，建立了顶空-气相色谱法对油脂中的4种卤代甲烷（三氯甲烷、四氯化碳、二氯一溴甲烷和一氯二溴甲烷）进行快速测定的方法。2.5 g样品在95 ℃下加热平衡30 min，自动顶空进样（进样时间4 s，进样量250 μL），目标物经CD-5石英毛细管色谱柱(30 m×0.32 mm，0.25 μm)分离，使用电子捕获检测器进行测定。4种卤代甲烷的空白基质曲线在2~200 μg/kg范围内呈良好线性关系，决定系数在0.998 3~0.999 9之间，方法检出限和定量限分别为0.
梁美宜， 莫锡乾， 曾绮莹， 黄静娴 LIANG Meiyi, MO Xiqian, ZENG Qiying, HUANG Jingxian
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Intact coastal nursery rearing amid climate‐driven phenological shifts in threatened salmon
Conservation Biology, EarlyView.Abstract Literature linking phenology to climate has proliferated in recent decades and shows that climate change has reorganized seasonal opportunities worldwide. However, this literature often quantifies changes in point measures of timing (e.g., beginnings and peaks) without context about duration (e.g., rearing season length) or performance (e.g ...
Stuart H. Munsch +8 more
wiley +1 more source
, 2016 本发明公开了一种高速航体的阻力测量装置和测量方法，该装置包括：高速航体入水系统，用以将航体样品加速到40~400m-s；航体初速度测量系统，用以测量航体样品入水前的速度；航体水下运动速度及流体场测量系统，用以测量航体样品水下运动的速度以及流体场的变化；水箱，用以提供航体样品水下运动的场所。本发明测量装置结构简单，使用方便，测量方法简单易操作，结果准确，可以将现有航体阻力评价手段由低速航体扩展到高速航体，突破了现有低速航体阻力测试的局限 ...
乌学东 +5 more
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Subspecies taxonomy reflects social and geographic patterns of taxonomic effort in tetrapods
Conservation Biology, EarlyView.Abstract Subspecies have been used in conservation biology to account for intraspecific patterns in genetic diversity, which is crucial to long‐term population viability. Although over 3200 subspecies are currently assessed by the International Union for Conservation of Nature Red List, their biological relevance remains controversial.
Jhonny J. M. Guedes +3 more
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Haiyang yu huzhao全氟辛酸(perfluorooctanic acid, PFOA)是一种具有多系统毒性的新污染物，对双壳贝类可产生一定的免疫毒性效应，损害机体的正常免疫功能。益生菌作为一种安全无毒的食品级制剂，已被应用于水产养殖行业，用以提高水生生物的免疫防御能力。然而，益生菌对贝类中新污染物所引发的生物毒性是否有消减作用，目前尚不可知。据前期研究，新污染物PFOA在水生生物尤其贝类中存在较高的蓄积量，具有潜在的生态和健康风险。因此，探索经济贝类中益生菌对PFOA免疫毒性的消减作用具有重要意义 ...
周 扬 +6 more
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, 2017 本发明属于联合收割机田间产量检测技术领域，具体涉及一种联合收割机谷物流量检测装置和测量方法，检测装置安装在收割机升运器出口处，主要用于收割机在田间作业时对谷物流量进行实时检测。本装置主要由PVDF压电薄膜、承接板、调节架、固定架、电荷放大器、采集模块组成。当谷物冲击PVDF压电薄膜上时，使PVDF压电薄膜的两极产生电荷。电荷放大器将这种电荷进行放大以标准电压输出。采集模块实时采集电荷放大器输出的电压，经转换处理得到谷物流量值，并将结果以数字通信方式输出。本发明测量精度高，抗干扰能量强 ...
张天 +5 more
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Methodology to identify ecologically matching areas and its applications in conservation planning
Conservation Biology, EarlyView.Abstract Identifying ecologically matching areas is both challenging and critical for understanding spatial patterns of biodiversity and advancing conservation planning. However, existing approaches often lack spatial flexibility, overlook shape and size constraints, or rely on limited environmental parameters, reducing their effectiveness in real ...
Pietro Milanesi +7 more
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, 2013 本发明涉及一种光学系统波前测量装置及测量方法，该光学系统波前测量装置包括激光器、小透镜阵列、成像透镜阵列、CCD阵列以及采集控制计算机；小透镜阵列、成像透镜阵列以及CCD阵列依次设置在激光器的出射光路上；CCD与采集控制计算机电性相连 ...
陈永权 +6 more
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Learning Styles, Engagement and Anxiety in AI‐Mediated Writing: A Multimodal Feedback Study
International Journal of Applied Linguistics, EarlyView.ABSTRACT Artificial intelligence (AI) tools now permeate English academic writing. However, evidence on how feedback modalities align with student differences and with psychological mechanisms remains limited. Prior work often reduced learning styles to simple matches with delivery modes and treated learning engagement and writing anxiety as peripheral.
Yi Ren +3 more
wiley +1 more source
, 2010 本发明公开了一种多功能传感器及高温下测量热流与温度的方法，其中多功能传感器包括外壳和热流测头，外壳上设置热流测头，热流测头包括热流探头和热沉，热沉与热流探头相连容置在外壳内部与热流探头组成热电偶，所述外壳内还设置有用于冷却热流测头的冷却装置和用于测量热沉温度的另一热电偶，两热电偶与检测仪相连，通过测量出两热电偶的电压信号实现热流和温度的检测。本发明公开的测量方法通过测量低温的温度，建立数学模型推导得出高温处的所测温度。本发明的多功能热传感器能够在高温环境下测量热流和温度 ...
王晶, 李龙, 范学军, 仲峰泉
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