|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Development of a questionnaire to measure the level of reflective thinking显示文摘 | Kember D D.Leung A.Jones A.Y.Loke L.Mckay K.Sinclair H.Tse C.Webb F.Wong M.Wong & E.Yeung | | 0，，： | 1 |
| 2 | 用以测量战区弹道导弹距离的红外被动式传感器的机载验证显示文摘单筒被动式测距方法(MPR)采用单个多色红外传感器以被动方式测量处于助推段的战区弹道导弹(TBM)的距离。机载主动式测距传感器,如雷达和光雷达,会引来反辐射导弹(ARM),因而只能在远离目标的地方进行深测。因此,机载雷达和光雷达不能在适当的位置上给出导弹发射的早期告警、估计导弹发射位置、或者预计弹着点。地面雷达看不到地平线以下的目标。比较起来,单筒被动式测距传感器可部署到敌方领土附近或者深入敌方领土,并且保持隐蔽以便在战区弹道导弹刚发射时就能对其进行观察、识别和跟踪,及时精确地报告其发射位置,预测其飞行路线和弹着点。被动式传感器可以封装在小盒子内,其重量轻,功耗小,成本比较低,容易适应飞机和卫星等平台。本文讨论一个机载数据采集计划,计划的目标是验证实用单筒被动式测距装置在测量助推段战区弹道导弹时所能达到的精度。同时也讨论工程设计与传感器性能方面的权衡折衷以及测距误差预算。 | Dennis L.Mckay 顾聚兴 | 2001 | 红外2001，22，11： | 0 |
| 3 | Early onset of a microcystin-producing cyanobacterial bloom in an agriculturally-influenced Great Lakes tributary显示文摘In late May 2016, a cyanobacterial harmful algal bloom(cHAB) was detected in the Maumee River, the largest tributary to Lake Erie, the southernmost lake of the Laurentian Great Lakes system. Testing on 31 May identified Planktothrix agardhii as the dominant cyanobacterium with cell abundance exceeding 1.7×10~9 cells/L and total microcystins(MC) reaching 19 μg/L MC-LR equivalents, a level over 10-fold higher than the 2015 revised U.S. Environmental Protection Agency(EPA) national health advisory levels for drinking water exposure to adults. Low river discharge coincident with negligible precipitation through the latter half of May coincided with an 80% decline in river turbidity that likely favored bloom formation by a low-light adapted P. agardhii population. Also contributing to the c HAB were high initial nutrient loads and an increase of the river temperature from 13℃ to 26℃ over this same period. The bloom persisted through 5 June with microcystins exceeding 22 μg/L MC-LR equivalents at the bloom peak. By 6 June, the river had returned to its muddy character following a rain event and sampling on 7 June detected only low levels of toxin(<0.6 μg/L) at public water systems located near the bloom origin. The elevated toxin production associated with this early onset bloom was without precedent for the Maumee River and an unique attribute of the c HAB was the high proportion of potentially-toxic genotypes. Whereas Planktothrix spp. is common in lotic environments, and has been previously detected in the Maumee, blooms are not commonly reported. This early onset, microcystin-producing c HAB provided a rare opportunity to glean insights into environmental factors that promote bloom development and dominance by Planktothrix in lotic environments. | Robert Michael L.McKAY Taylor TUTTLE Laura A.REITZ George S.BULLERJAHN William R.CODY Adam J.McDOWELL Timothy W.DAVIS | 2018 | Journal of Oceanology and Limnology2018，36，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员