Results 61 to 70 of about 621,014 (218)
, 2012 本发明涉及一种联合变换相关像移测量方法，该方法包括：1）在构造参考图像fr(x,y)和被测图像ft(x,y)时在两幅图像之间引入一个固定的错位量a；2）参考图像和被测图像按照像元强度值或灰度值对应相加，形成相关输入图像i(x,y)；3）进行傅里叶计算，并对计算结果模的平方进行傅里叶逆变换后得到其相关输出；4）对互相关峰位置进行检测和计算，并对计算结果扣除固定错位量a得到两幅图像间的实际错位信息。本发明提供了一种在不影响测量性能的基础上可有效降低联合变换相关方法的计算量 ...
李旭阳, 陈茜, 贺天兵, 易红伟
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Conservation Biology, EarlyView.Abstract Robust estimates of the magnitude of protected species bycatch are essential for effective fisheries management and marine conservation. Existing bycatch estimation methods typically struggle to accurately and precisely estimate the bycatch of rare species as a result of the statistical assumptions necessary to overcome infrequent encounters ...
Christopher Long +3 more
wiley +1 more source
Risk reduction, rangeland use, and the future of human–carnivore coexistence
Conservation Biology, EarlyView.Abstract Efforts to reduce livestock losses to large carnivores are widely regarded as essential for promoting human–carnivore coexistence. Predator‐proof enclosures, compensation programs, improved livestock guarding, and real‐time predator alert systems can reduce depredation and retaliatory killing while enhancing pastoralist livelihoods.
Craig Packer
wiley +1 more source
四川大学学报. 自然科学版, 1980 这是熟知的,两个相互等价的(即可经行列式为±1的整系数齐次线性变换互变的)实系数n元二次型f和g,对变元的所有整数值来说,表数相同(即凡能由f以整变元表出之数均可由型g以整变元表出,反之亦真).但是,相反的结论是否能够成立呢?亦即是否表数相同的二次型一定是等价的呢?这是基本而古老的问题.1830年,Legendre曾未加证明地断言,表数相同的二元恒定二次型必等价.1895年,Bauer曾就有相同行列式的真本原整系数恒定二元二次型这一特殊情形证明了Legendre的断言.
柯召, 郑德勋
doaj
A framework for integrating resilience indicators into risk assessments
Conservation Biology, EarlyView.Abstract Globally, ecosystems are increasingly threatened by climate change and human pressures, yet ecosystem risk assessments predominantly emphasize exposure to stressors while overlooking intrinsic ecosystem resilience—the capacity to absorb and recover from disturbances.
Benoît Pichon +4 more
wiley +1 more source
, 1995 采用Ｂｕｄｉａｎｓｋｙ等人提出的相交增韧陶瓷材料的体膨胀本构关系，利用渐近解法得到该材料平面应变Ⅰ型定常扩展裂纹尖端附近的应力、速率沿角度的分布情况 ...
叶裕恭, 张浠
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四川大学学报. 自然科学版, 1985 用倒扭摆法测试了18 Ni马氏体时效钢的低频内耗.发现在降温中于165℃附近出现正马氏体相变内耗峯.在升温中于700℃附近出现反马氏体相变内耗峯.内耗峯的高度与T/f(T—温度变化速率,f—振动频率)成线性关系,恒温测量时,相变内耗降为背景值.还观察到相变过程中,切变模量发生软化.我们认为这个内耗是由外加切应力促进或加速接近临界的马氏体胚芽的界面位错滑移所引起.
何思明 +3 more
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, 2014 本发明涉及一种相变控温防晒薄膜及其制备方法。其特征在于相变控温防晒薄膜是以微胶囊复合相变材料为智能控温成分，采用氧化锌、二氧化钛、银、氧化铝等纳米颗粒作为抗紫外线材料，以PVC、PET、PE等薄膜为基体材料塑化复合而成。本发明首先将基体材料的树脂粉，塑料助剂通过高速搅拌混炼成均匀稳定的增塑糊，然后加入微胶囊复合相变材料和纳米颗粒，继续搅拌混合均匀，最后通过涂敷成形、高温固化制备出具有较好相变储能特性和较高抗紫外线性能的新型相变控温防晒薄膜，该薄膜在可见光区的透过率可达65%，在紫外光区的透过率仅为10%
徐芬 +4 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
相对性原理及其对自然界定律的协变性要求：机械能守恒定律协变性疑难的解
, 2000 阐明狭义相对性原理的准确含义，批出它并不要求自然界每条定律都单独协变，但要求每条定律至少属于一个协变集合，给出最小协变集的求法。表明机械能守恒定律满足狭义相对性原理及其对自然界定律的协变性要求，还指出一切社会科学定律也都满足狭义相对性原理。阐明狭义相对性原理的准确含义，批出它并不要求自然界每条定律都单独协变，但要求每条定律至少属于一个协变集合，给出最小协变集的求法。表明机械能守恒定律满足狭义相对性原理及其对自然界定律的协变性要求 ...
朱如曾
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