300W型LED集鱼灯光学特性及其节能效果分析

高效节能型新光源集鱼灯的应用研究是光诱渔业研究的重要内容之一.使用高光谱剖面仪Hyperspectral profiler Ⅱ对所研制的国产300 W型LED集鱼灯的光学特性进行测量,并与1 kW型、1.5 kW型、2 kW型金属卤化物集鱼灯进行比较,表明国产LED集鱼灯具有良好的水中穿透性,能够满足渔业生产需要.根据...     

日本鳗鲡早期幼苗趋光性及视觉发育特征

研究了出膜后第1～9 d的日本鳗鲡(Anguilla japonica)早期幼苗,在不同光强度下趋光性分布及视觉发育组织学特征。结果显示:在8900 lux的强光条件下,日本鳗鲡早期幼苗随着发育,表现出明显的负趋光性。到9 d时,占存活幼苗52.2%的幼苗都集中在最暗的110 lux区域;而在2300 lux的弱光条件下,表现出趋弱光性。到9 d时,占存活幼苗44.6%的幼苗都集中在25 lux区域。视网膜发育的组织学观察发现,日本鳗鲡幼苗的视网膜发育首先出现的是外界膜和内界膜,最后出现的是外丛层。幼苗的整个视网膜结构到9 d时,发育为9亚层结构。视网膜中最发达的是外核层,由3种细胞构成。发育最快的是内核层,由2种细胞构成。结果表明,与日本鳗鲡早期幼苗趋光性有关的因素包括视网膜分层、视网膜厚度、内核层细胞数等多种因素。另外,本研究还探讨了日本鳗鲡幼苗在自然界可能生存的水深和光环境。     

OBS网络的拥塞控制汇聚算法分析

传统OBS网络汇聚算法没有综合考虑边缘节点汇聚算法和核心节点的数据调度算法二者之间的相互联系，其通信性能受限。在分析OBS网络边缘节点汇聚算法对核心节点数据调度的影响后，提出了一种新的边缘节点汇聚算法——基于OBS网络的拥塞控制汇聚算法（CCAA）。该算法通过分析边缘节点汇聚参数对数据调度的影响，调整汇聚算法实现对核心节点调度成功率的影响，最终实现了提高核心节点数据调度的成功概率。     

基于扩展光学模型的电磁信号传播系统设计与实现

电磁信号传播系统的建模在复杂环境下有十分重要的意义，并且对模拟系统的准确性和快速性有一定的要求。本文基于扩展光学模型，以Java为平台开发语言，以射线追踪为核心算法，实现基于扩展光学模型的电磁信号传播系统的设计。通过与AREPS（高级折射效应预测系统）比较，证明本系统建模的准确性和很快的速度响应。     

基于MCD19-A2数据和GWR模型的2011－2020年中国大气PM2.5质量浓度反演

为探究MODIS高时空分辨率气溶胶产品数据在长时间序列下对于反演中国陆地PM_2.5质量浓度的适用性和准确性。该研究基于MCD19-A2数据研究2011-2020年中国陆地气溶胶光学厚度(aerosol optical depth,AOD)的时空分布特征，以降水、风速等8个气象要素为辅助变量建立反演PM_2.5的地理加权回归模型(geographically weighted regression,GWR)并分析中国陆地PM_2.5的空间分布。结果表明：1)2011-2020年中国陆地气溶胶时空分布基本符合“西低东高、逐年下降”的规律且10 a间AOD值存在较大季节差异，春季(0.294)>夏季(0.262)>冬季(0.223)>秋季(0.194)。2)利用方差膨胀系数(variance expansion coefficient,VIF)对变量进行多重共线性检验，建立并分析2011-2020年GWR模型，发现建模集决定系数均大于0.760，验证集决定系数均大于0.740，且均方根误差均小于7.070μg/m...     

Using rainfall simulation to guide planning and management of rehabilitated areas: Part II. Computer simulations using parameters from rainfall simulation

This paper reports computer simulations carried out using data from a rainfall simulator study on a steeply sloping revegetated area (a soundbund) at the NorthParkes Mine, near Parkes in New South Wales, Australia. Simulations of slope stability used a combination of daily time‐step models to consider soil water balances and runoff, growth of grass/legume pasture and soil erosion. Simulations indicated that long‐term erosion rates on the soundbund would be low (1·01–1·27 t ha⁻¹ yr⁻¹) due to low runoff rates and good vegetative cover. The simulations highlighted that peak vegetative growth occurred prior to the period of peak erosion hazard, with carry‐over dry matter being crucial for erosion control during the period of peak rainfall erosivity. This, in turn, indicated that grazing during the periods of peak growth and peak erosion hazard should be avoided (to avoid loss of dry matter). It also indicated that there was value in establishing grass species that would give greater growth during summer months, and that may produce dry matter that is more persistent through time. Simulations of stormwater flows in channels draining various lifts on the soundbund compared a range of alternatives with respect to channel length, gradient and roughness. The simulations indicated little effect of channel length on peak flow rates or depths once channel lengths exceeded 250 m and also showed little effect of vegetative roughness on peak flow rates or depths once Manning's n values exceeded 0·05. Implications of these results for design of drainage channels and drop structures on the soundbund are discussed. Copyright © 2000 John Wiley & Sons, Ltd.     

Two is not necessarily better than one: A double lens in a pre-metamorphic adult axolotl (Ambystoma mexicanum)

An 8-year-old female pre-metamorphic axolotl (Ambystoma mexicanum) was examined for a suspected anterior lens luxation. Slit-lamp biomicroscopy revealed two lens-like structures in the anterior chamber of the right eye (OD), each with cataractous change. Ultrasound biomicroscopy and optical coherence tomography (OCT) were performed without sedation, and revealed small lenticular structures each with distinct nuclei and cortices. Although a distinct connection of the two lenticular structures could not be definitively ruled out, the structures appeared separate. Each of the lenticular structures was closely associated with its respective iris leaflet. This report demonstrates application of advanced imaging for diagnostic use in axolotl ophthalmology, showing that imaging of the lens can be performed without sedation, topical anesthetic, nor contact gel with high diagnostic quality. Although two distinct lenses were diagnosed with no historical evidence of trauma, the small sizes of each lenticular structure, with no detectable connection between them, are suggestive of a possible regenerative abnormality. This report opens discussion for the regenerative capabilities of the pre-metamorphic adult axolotl and possible implementations of their use in regenerative medicine research for the development of future therapies.