Results 71 to 80 of about 1,217,548 (163)
在多速率BPSK/DBPSK软件解调中多普勒频偏矫正的一种方法
四川大学学报. 自然科学版, 2001 介绍了用于多速率ＢＰＳＫ／ＤＢＰＳＫ软件化解调中的一种多普勒频偏矫正方法．该方法综合利用频率扫描和ＡＦＣ环及ＰＬＬ等频偏矫正方法，能有效估计和矫正达几十倍甚至几百倍码速的频偏，并能兼顾不同的码速和ＢＰＳＫ，ＤＢＰＳＫ两种不同的调制方式，从而解决了在多速率ＢＰＳＫ／ＤＢＰＳＫ信号软件化整体解调过程中多普勒频偏的矫正问题．将该方法用于多速率ＢＰＳＫ／ＤＢＰＳＫ信号软件化整体解调的计算机仿真实验，收到了良好的效果．
王素玉, 王永德, 李辉, 郭恩远
doaj
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Lithium‐rich manganese‐based cathodes (LRM) deliver high discharge capacities beyond 250 mAh g−1, but their practical deployment is restricted by irreversible oxygen redox, structural reconstruction, sluggish kinetics and unstable cathode‐electrolyte interfaces (CEI). Here, we develop a colloid‐assisted anchoring‐diffusion engineering strategy
Jia‐Nan Hao +13 more
wiley +1 more source
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT The pollution caused by antibiotics to aquatic ecosystems is becoming increasingly serious, thus more effective treatment methods are urgently required. Although the photocatalytic degradation behavior of tetracycline (TC) is relatively well understood, sulfamethoxazole (SMZ), an emerging pollutant originating from large‐scale livestock ...
Yihang Yang +6 more
wiley +1 more source
四川大学学报. 自然科学版, 1984 把5/121表成三个单位分数的和,即求方程 5/121=1/x+1/y+1/z的正整数解问题,Blericher得到一组解为(x,y,z)=(25,759,208725)。但是,Bleri-cher不知道三项展开式能否具有一个小于208725的最大分母,这个问题容易解决。看来更有意义的问题是:(1)是否有max(x,y,z)>208725的解。本文得到(1)的全部解共21组,其中max(x,y,z)>208725的解一组。从而解决了以上问题。
刘元章
doaj
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Sodium‐ion batteries (SIBs) offer a promising, cost‐effective alternative for large‐scale energy storage due to the abundance of sodium. However, their practical deployment is challenged by sluggish interfacial kinetics and unstable interphase formation, which severely limit performance across wide temperature ranges. Here, we demonstrate that
Mingxing Zhang +10 more
wiley +1 more source
, 2006 对能够求解一系列线性常微分方程组边值问题的数值计算方法--离散正交法(DOM)进行了离散点的正交分析,给出了计算机实现数值计算的程序设计原理与计算流程图,指出了该方法能够克服传统计算方法由于所求函数的快速增长所引起的边界效应和局部效应的缺点,给出了得到稳定计算过程的可能性.为了推广应用,文中介绍了离散正交法的基本原理、实现方法和求解过程,讨论了采用离散正交法来求解非线性问题的处理方法.并且以承受均布载荷的环形板为例 ...
白象忠, 田振国
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具有时滞的周期Lotka-Volterra系统的持久性与渐进稳定性(英文)
四川大学学报. 自然科学版, 2004 研究了具有反馈的Lotka Volterra方程,给出了其正解具有持久性的充分条件.并利用Horn不动点定理,得到其正周期解的存在性.
曾永福, 徐道义
doaj
Risks of concealing environmental degradation
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract Current practice seeks to conceal the visual impact of land‐use change (i.e., development). Six percent of development impact assessments in Australia and 14% of the World Bank's assessments recommend visual impact mitigation. This mitigation results in, for example, vegetated buffer strips alongside cleared agricultural areas and earthen ...
Matt W. Hayward +8 more
wiley +1 more source
, 2013 环己烷液相氧化制备环己醇与环己酮（K/A 油）是重要的石油化工过程。其中，环己基过氧化氢（CHHP）是环己烷氧化的重要中间体，CHHP分解是环己烷氧化的关键步骤之一。目前工业分解CHHP的方法为碱分解法，该方法K/A油的总选择性较低，而且反应过程中消耗大量NaOH，产生的废碱渣对环境污染严重。如何实现无碱高效分解CHHP，对节约资源，降低生产成本，实现清洁生产和环境保护，具有重要的科学意义和应用价值。 论文首次对氮正离子-过渡金属均相催化CHHP分解的性能进行研究 ...
郑玺
core