搜索结果: 1-15 共查到“理学 Trap”相关记录66条 . 查询时间(0.109 秒)
Picture two children playing on swings in a playground. One is a daredevil, launching themselves high off the ground in big arcs. The other daydreams, swinging gently.
比较双层叠帐法和BG-trap诱捕器法2种媒介伊蚊监测方法在登革热疫点的捕蚊效果，为科学开展监测提供参考。方法 2017年9－10月，选择杭州市12个区（县）的160个住宅区，包括核心区、警戒区及监控区，同时使用双层叠帐法和BG-trap诱捕器法对居民区及其周围环境进行媒介伊蚊应急监测，2种方法设置间隔100 m以上，监测30 min，分别计算叮咬指数（只/h）和诱蚊指数（只/h）。采用单因素方差...
The sand trap:Demand outpaces caution–and knowledge（图）
sand trap Demand outpaces caution knowledge
2017/9/20
Sand, spanning miles of beaches, carpeting vast oceans and deserts, is a visual metaphor for limitless resources. Yet researchers in this week’s journal Science seize another metaphor – sand in an ho...
Scientists discover spring-loaded mechanism in unusual species of trap-jaw ant（图）
scientists spring-loaded mechanism trap-jaw ant
2017/9/19
Researchers reveal how a group of trap-jaw ants can snap their jaws shut at speeds of up to 50 miles per hour – just fast enough to capture their elusive prey.
They report their findings in the Journ...
Camera-trap research paves the way for global monitoring networks
Camera-trap research global monitoring networks
2017/7/24
Biodiversity loss is one of the driving factors in ecosystem change, on par with climate change and human development. When one species, especially a large predator, disappears from an area, other pop...
Trap and neutralize:A new way to clean contaminated groundwater
Trap neutralize clean contaminated groundwater
2016/4/25
A team of researchers from Washington University in St. Louis have helped discover a new chemical method to immobilize uranium in contaminated groundwater, which could lead to more precise and success...
Estimation of useful life of a reservoir using sediment trap efficiency
reservoir sedimentation trap efficiency Te
2015/8/13
The most important practical and critical problem related to the performance of reservoirs is the estimation of storage capacity loss due to sedimentation process. The problem to be addressed is to es...
Trap-jaw ants jump with their jaws to escape the antlion's den
Trap-jaw ants jump escape the antlion's den
2015/5/25
Some species of trap-jaw ants use their spring-loaded mandibles to hurl themselves out of harm’s way when an ant-trapping predator stalks, researchers report in the journal PLOS ONE. This dramatic man...
Trap Crop Systems for Striped Cucumber Beetle Control in Winter Squash
Striped Cucumber Beetle Contro Winter Squash
2015/1/22
Striped cucumber beetle, Acalymma vittatum F., is the primary insect pest of cucurbit crops in the Northeastern United States. Adult beetles colonize squash crops from field borders, causing feeding d...
Estimation of useful life of a reservoir using sediment trap efficiency
reservoir sedimentation trap efficiency Te capacity inflow ratio C/I useful life of reservoir Brune (1953) method Gill (1979) method
2015/1/7
The most important practical and critical problem related to the performance of reservoirs is the estimation of storage capacity loss due to sedimentation process. The problem to be addressed is to es...
Quantum-Monte-Carlo Calculations for Bosons in a Two-Dimensional Harmonic Trap
Bose system the boson harmonic trap condensate oil fractions super fluid density gas condensate
2014/12/22
Path-Integral-Monte-Carlo simulation has been used to calculate the properties of a two-dimensional (2D) interacting Bose system. The bosons interact with hard-core potentials and are confined to a ha...
Quantum-Monte-Carlo calculations for Bosons in a two-dimensional harmonic trap
Simulation of the bose system bosons harmonic trap the fluid density
2014/12/22
Path-Integral-Monte-Carlo simulation has been used to calculate the properties of a two-dimensional (2D) interacting Bose system. The bosons interact with hard-core potentials and are confined to a ha...
利用Needle trap集现场采样、无溶剂提取和热解吸进样等多功能为一体的特点,针对密闭的20 mL顶空样品瓶(10 mL样品),通过优化提取温度、样品平衡时间、注射器推杆循环抽拉体积、加盐量及现场采样保存时间等条件,确定了Needle trap吸附提取地下水中7种苯系物的最佳条件,用顶空进样气相色谱法测定,方法加标回收率为84.27%~115.03%,检出限为0.06~0.09 μg/L,精密...
Ground state sideband cooling of an ion in a room temperature trap with a sub-Hertz heating rate
Ground state sideband ion sub-Hertz heating rate Atomic Physics
2012/5/29
We demonstrate resolved sideband laser cooling of a single 40Ca+ ion in a macroscopic linear radio frequency trap with a radial diagonal electrode spacing of 7 mm and an rf drive frequency of just 3.7...
On the Rigorous Derivation of the 3D Cubic Nonlinear Schr鰀inger Equation with A Switchable Quadratic Trap
Gross-Pitaevskii Hierarchy Switchable Quadratic Trap Collapsing Estimate Klainerman-Machedon Board Game and Space-time Bound
2012/4/17
We consider the dynamics of the 3D N-body Schr\"odinger equation in the presence of a switchable quadratic trap. We assume the pair interaction potential is N^{3{\beta}-1}V(N^{{\beta}}x). We justify t...