densityaltitude的简单介绍
关于太空的资料(英文)
Outer space

"Deep space" redirects here. For the NASA space probes, see Deep Space 1 and Deep Space 2.
Layers of Atmosphere - not to scale (NOAA)Outer space, also simply called space, refers to the relatively empty regions of the universe outside the atmospheres of celestial bodies. Outer space is used to distinguish it from airspace (and terrestrial locations). Contrary to popular understanding, outer space is not completely empty but contains a low density of particles, predominantly hydrogen gas as well as electromagnetic radiation.
Earth's boundary
There is no discrete boundary between the Earth's atmosphere and space as the atmosphere gradually attenuates with increasing altitude. If the atmosphere had a constant temperature, its pressure would decrease exponentially from a sea-level value of 100 kPa (1 bar) toward its final value of zero. The Federation Aeronautique Internationale has established the Kármán line at an altitude of 100 km (62 miles) as a working definition for the boundary between atmosphere and space. The United States designates people who travel above an altitude of 50 miles (80 km) as astronauts. During re-entry, 400,000 feet (75 miles or 120 km) marks the boundary where atmospheric drag becomes noticeable.
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Solar System
Outer space within the solar system is called interplanetary space, which passes over into interstellar space at the heliopause. The vacuum of outer space is not really empty; it is sparsely filled with several dozen organic molecules discovered to date by microwave spectroscopy. According to the Big bang theory,2.7 K blackbody radiation was left over from the 'big bang' and the origin of the universe, and co**ic rays, which include ionized atomic nuclei and various subatomic particles. There is also gas, pla**a and dust, and **all meteors and material left over from previous manned and unmanned launches that are a potential hazard to spacecraft. Some of this debris re-enters the atmosphere periodically.
The absence of air makes outer space (and the surface of the Moon) ideal locations for astronomy at all wavelengths of the electromagnetic spectrum, as evidenced by the spectacular pictures sent back by the Hubble Space Telescope, allowing light from about 14 billion years ago, back almost to the time of the Big Bang to be observed. Pictures and other data from unmanned space vehicles have provided invaluable information about the planets, asteroids and comets in our solar system.
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Pressure variance
Going from sea level to outer space produces a pressure difference of only about 15 lbf/sq in, equal to surfacing from an underwater depth of about 34 ft (10 m).
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Vacuum
Contrary to popular belief a person suddenly exposed to the vacuum would not explode, but it would take a matter of milliseconds for a person to freeze to death. Water vapor would start to boil off from exposed areas such as the cornea of the eye, and along with oxygen, from membranes inside the lungs. Here is NASA's explanation.
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Satellites
There are many artificial satellites orbiting the Earth, including geosynchronous communication satellites 35,786 km (22,241 miles) above mean sea level at the Equator. Their orbits never "decay" because there is almost no matter there to exert frictional drag. There is also increasing reliance, for both military and civilian uses, of satellites which enable the Global Positioning System (GPS). A common misconception is that people in orbit are outside Earth's gravity because they are obviously "floating". They are floating because they are in "free fall": the force of gravity and their linear velocity is creating an inward centripetal force which is stopping them from flying out into space. Earth's gravity reaches out far past the Van Allen belt and keeps the Moon in orbit at an average distance of 384,403 km (238,857 miles). The gravity of all celestial bodies drops off toward zero with the inverse square of the distance.
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Milestones on the way to space
Sea level - 100 kPa (1 atm; 1 bar; 760 mm Hg; 14.5 lbf/in²) of atmospheric pressure
4.6 km (15,000 ft) - FAA requires supplemental oxygen for aircraft pilots and passengers.
5.0 km (16,000 ft) - 50 kPa of atmospheric pressure
5.3 km (17,400 ft) - Half of the Earth's atmosphere is below this altitude.
8.8 km (29,035 ft) - Summit of Mount Everest, the highest mountain on Earth
16 km (52,500 ft) - Pressurized cabin or pressure suit required.
18 km (59,000 ft) - Boundary between troposphere and stratosphere
20 km (65,600 ft) - Water at room temperature boils without a pressurized container. (The popular notion that bodily fluids would start to boil at this point is false because the body generates enough internal pressure to prevent it.)
24 km (78,700 ft) - Regular aircraft pressurization systems no longer function.
32 km (105,000 ft) - Turbojets no longer function.
34.7 km (113,740 ft) - Altitude record for manned balloon flight
45 km (148,000 ft) - Ramjets no longer function.
50 km (164,000 ft) - Boundary between stratosphere and mesosphere
80 km (262,000 ft) - Boundary between mesosphere and thermosphere
100 km (328,084 ft) - Kármán line, defining the limit of outer space according to the Fédération Aéronautique Internationale. Aerodynamic surfaces no longer function from lack of significant atmospheric density.
120 km (400,000 ft) - First noticeable atmospheric drag during re-entry from orbit
200 km - Lowest possible orbit with short-term stability (stable for a few days)
350 km - Lowest possible orbit with long-term stability (stable for many years)
690 km - Boundary between thermosphere and exosphere
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Regions of outer space
Cislunar space
Interplanetary space
Interstellar medium
Intergalactic space
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Space does not equal orbit
To perform an orbital space flight, a spacecraft must go higher and faster than for a sub-orbital space flight. A spacecraft has not made orbit until it is circling the Earth at a sufficiently great speed such that the weight of the spacecraft is exactly equal to the centripetal acceleration required to keep it in a circular orbit (see circular motion). It must not only rise above the atmosphere, but must also achieve a sufficient orbital speed (angular velocity). For a low Earth orbit, this is about 7.9 km/s (18,000 mph). Konstantin Tsiolkovsky was the first to realize that, given the energy available from any available chemical fuel, a several-stage rocket would be required. The escape velocity to pull free of Earth’s gravitational field altogether and move into interplanetary space is about 40,000 km/h (25,000 mph or 11,000 m/s). The energy required to reach velocity for low Earth orbit (32 MJ/kg) is about twenty times the energy required simply to climb to the corresponding altitude (10 kJ/(km·kg)).
There is a major difference between sub-orbital and orbital space flights. Minimal altitude for a stable orbit around the Earth, without excessive atmospheric drag, begins at around 350 km (220 miles) above mean sea level. A common misunderstanding about the boundary to space is that orbit occurs simply by reaching this altitude. Achieving orbital speed can theoretically occur at any altitude, although atmospheric drag precludes an orbit that is too low. At sufficient speed, an airplane would need a way to keep it from flying off into space, but at present, this speed is several times greater than anything within reasonable technology.
雪豹的英语介绍
外貌
The snow leopard is a moderately large cat native to the mountain ranges of South Asia and Central Asia. The classification of this species has been subject to change and its exact taxonomic position will not be resolved until further studies are conducted.
Snow leopards live between 3,000 and 5,500 metres (9,800 and 18,000 ft) above sea level in the rocky mountain ranges of Central Asia. Their secretive nature means that their exact numbers are unknown, but it has been estimated that between 3,500 and 7,000 snow leopards exist in the wild and between 600 and 700 in zoos worldwide.
Snow leopards are **aller than the other big cats but, like them, exhibit a range of sizes, generally weighing between 27 and 54 kilograms (60 and 120 lb). Body length ranges from 75 to 130 centimetres (30 to 50 in), with the tail adding an additional 75 to 90 percent of that length.
Snow leopards have long thick fur, whose base colour varies from **oky grey to yellowish tan, with whitish underparts. They have dark grey to black open rosettes on their body with **all spots of the same color on their heads and larger spots on their legs and tail. Unusually among cats, their eyes are pale green or grey in colour.
Snow leopards show several adaptations for living in a cold mountainous environment. Their bodies are stocky, their fur is thick, and their ears are **all and rounded, all of which help to minimize heat loss. Their paws are wide, which distributes their weight better for walking on snow, and have fur on their undersides to increase their grip on steep and unstable surfaces; it also helps to minimize heat loss. Snow leopards' tails are long and flexible, helping them to maintain their balance which is very important in the rocky terrain they inhabit; the tails are also very thick due to storage of fats, and are very thickly covered with fur which allows them to be used like a blanket to protect their faces when asleep.
The snow leopard has a short muzzle and domed forehead, containing unusual large nasal cavities that help the animal breathe the thin cold air of their mountainous environment.
Snow leopards cannot roar, despite possessing some ossification of the hyoid bone. This ossification was previously thought to be essential for allowing the big cats to roar, but new studies show that the ability to roar is due to other morphological features, especially of the larynx, which are absent in the snow leopard. Snow leopard vocalizations include hisses, chuffing, mews, growls, and wailing.
Population and protected areas 现状
The total wild population of the snow leopard was estimated at only 4,080 to 6,590 individuals by McCarthy et al. 2003 (see table below). Many of these estimates are rough and outdated.
In 1972 the International Union for Conservation of Nature (IUCN) placed the snow leopard on its Red List of Threatened Species as globally "Endangered"; the same threat category was applied in the asses**ent conducted in 2008.
There are also 600-700 snow leopards in zoos around the world.(现存数量参见附图)
Conservation 保护
There are numerous agencies working to conserve the snow leopard and its threatened mountain ecosystems. These include the Snow Leopard Trust, the Snow Leopard Conservancy, the Snow Leopard Network, and the Panthera Corporation. These groups and numerous national governments from the snow leopard's range, non-profits and donors from around the world recently worked together at the 10th International Snow Leopard Conference in Beijing. Their focus on research, community programs in snow leopard regions and education programs are aimed at understanding the cat's needs as well as the needs of the villagers and herder communities impacting snow leopards' lives and habitat.
自考英语二下册单词电子版
自考英语二高频词汇(打印版)(1).pdf
链接:
?pwd=a22i 提取码: a22i
英文中文对照
A
abandoned w ell 废井
absorption isotherm 等温吸附
abundance 丰度
acceptance probability 接受概率
acid mine drainage 酸性矿坑排水
acid rain 酸雨
acidity 酸度
acid 酸
active ( inactive) node 活动( 不活动) 结点
activity 活度
activity coefficient 活度系数
adhesive force 吸附力
adsorption 吸收,吸附
advection-diffusion equation 对流 - 扩散方程
advection-dispersion equation 对流 - 弥散方程
aerobic biodegradation 好氧生物降解
age dating of groundw ater 地下水定年
air pressure 气压
alkalinity 碱度
alluvial apron 冲积裙
alluvial fan 冲积扇
alluvial valley 冲积谷地
alluvium 冲积层( 物)
altitude effect 高程效应
aluminum silicate 铝硅酸盐
amplitude 幅度
anaerobic biodegradation 厌氧生物降解
****ytical method / approach 解析法
****ytical solution 解析解
angle of internal friction 内摩擦角
anhydration 脱水
anhydrite 硬石膏
anisotropy 各向异性
aqueous chemistry 水化学
aquiclude 隔水层
aquifer 含水层
aquifer system 含水层系统
aquifuge 不透水层
aquitard 弱透水层
arid region 干旱地区
arithmetic mean 算术平均
artesian aquifer 自流含水层
artesian w ell 自流井
artificial recharge 人工补给
atmospheric pressure 大气压力
autocorrelation function 自相关函数
B
backfill soil 回填土
background concentration 背景浓度
bandw idth 带宽
bar chart 条形图
barometric pressure 大气压力
base flow 基流
Bayes theorem 贝叶斯理论
bedrock 基岩
benchmark 基准
best linear unbiased estimate 最优线性无偏估计
bicarbonate 重碳酸根
biodegradation 生物降解
biological degradation 生物降解
bioremediation 生物修复
blind drainage area 内流区
blind valley 盲谷
boiling spring 沸泉
borehole geochemical probe 钻孔地球化学探头
borehole geophysics 钻孔地球物理
boring 钻孔
boundary condition 边界条件
boundary of specified head 给定水头边界
brackish w ater 微咸水
braided river / stream 辫状河
breakthrough curve 穿透曲线
brine 卤水
bromide / chloride ratio Br / Cl 比
bulk density 体积密度
buried karst 隐伏岩溶
C
Ca / Mg ratio Ca / Mg 比
calcite 方解石
calcium 钙
calcium carbonate 碳酸钙
calibrated model 校正模型
calibration 校准,校正
Cambrian-Ordovician aquifer 寒武 - 奥陶系含水层
capillarity 毛细现象
capillary w ater 毛细水
capillary zone / fringe 毛细水带
capture zone 捕获区
carbon cycle 碳循环
carbon dioxide 二氧化碳
carbon fixation 碳固定
carbon - 14 碳 - 14
carbon - 14 dating 碳 - 14 测年
carbonate rock 碳酸盐岩
case study 实例研究
casing 套管
cation exchange 阳离子交换
cation-anion balance 阴阳离子平衡
Cauchy boundary condition 柯西( 混合) 边界条件
chloride 氯化物,氯离子
chlorine - 36 氯 - 36
clastic rock 碎屑岩
clastic sedimentary rock aquifer 碎屑 沉积岩含水层
clay 粘土
clay soil 粘性土
clogging 堵塞
closed system 闭系统
closure criterion 收敛标准
coastal aquifer 滨海含水层
coefficient of compressibility 压缩系数
coefficient of leakage 越流系数
coefficient of permeability 渗透系数
coefficient of skew ness 偏斜系数
coefficient of variation 变差系数
cohesive soil 黏结性土壤
collapse 塌陷
column experiment 柱实验
compressibility 压缩性
concentration gradient 浓度梯度
conceptual model 概念模型
concrete dam 混凝土坝
condensation 浓缩
conditional ( unconditional) simulation 条件( 非条件) 模拟
conditional distribution 条件分布
cone of depression 降落漏斗
confidence interval 置信区间
confidence limit 置信限
confined aquifer 承压含水层
confining layer 隔水层
connate w ater 同生水
conservative pollutant 非降解污染物
consolidation 固结
consolidation of soil 土壤固结
constant head boundary 定水头边界
constant temperature zone 恒温带
constraint 约束( 条件)
contact spring 接触泉
contaminant plume 污染羽
contaminant transport modeling 污染 物 运移模拟
contamination source 污染源
continental drift 大陆漂移
continental effect 大陆效应
continuity equation 连续性方程
contour map 等值线图
convection 对流
coordinate system 坐标系
correlation length 相关长度
corrosion 腐蚀
covariance 协方差
critical depth 临界深度
crystalline rock 结晶岩
cumulative frequency function 累积频率函数
current meter 流量计
curve-matching procedure 配线法
D
Darcian velocity 达西流速
Darcy's law 达西定律
data assimilation 数据融合
datum level 基准面
dead carbon 死碳
dead-end pore 死端孔隙
debris flow 泥石流
decay constant 衰变常数
decay equation 衰变方程
decision variable 决策变量
declustering 去丛
deep sedimentary w ater 深层沉积水
density-dependent flow 变密度流
depletion 消耗
depositional sequence 沉积序列
depression 洼地,坳陷
depression spring 下降泉,洼地泉
deterministic model 确定性模型
deuterium 氘
deuterium excess 氘盈余( 过剩)
dew point 露点
dew ater 排水,疏干
diffusion 扩散
digital elevation model 数字高程模型
dimensionless variable 无量纲变量
direction of maximum continuity 最大连续性方向
Dirichlet condition 狄里克莱边界条件
discharge 排泄
discharge area 排泄区
discharge of w ell 井的涌水量
discretization 剖分,离散
dispersion 弥散
dispersion coefficient 弥散系数
dissolution and precipitation 溶解与沉淀
dissolved oxygen 溶解氧
distributed pollutant source 分布式( 面) 污染源
distributed sink / source 分 布 式 ( 面 ) 汇 /源
diurnal change 昼夜变化
dolomite 白云岩
dolomitization 白云石( 岩) 化
drainage 排水
draw dow n cone 降落漏斗
draw dow n curve 降深曲线
drinking w ater standard 饮用水标准
dual problem 对偶问题
dune 沙丘
Dupuit assumption / hypothesis 裘布依假设
duration curve 历时曲线
dynamic equilibrium 动态平衡
E
earthquake 地震
earth tide 固体潮
effect of barometric pressure 气压效应
effective porosity 有效孔隙度
effective stress 有效应力
effluent river 地下水补给的河流
electrical conductance 电导
electrical conductivity 电导率
electrical sounding 电测深
elevation effect 高程效应
elevation head 位置水头
enclosed ( non-enclosed) basin 闭合( 不闭合) 流域
endorheic basin 内流( 陆) 盆地
enthalpy 焓
entropy 熵
environmental isotope 环境同位素
equilibrium constant 平衡常数
equilibrium w eight 当量
equipotential line / surface 等势线 / 面,等水头线/面
equivalent 当量
ergodicity 各态历经,遍历性
erosion 侵蚀
error of estimate 估计误差
error tolerance 容许误差
Eularian approach 欧拉法
eustatic sea-level change 全球性海平面变化
evaporation 蒸发
evaporite 蒸发岩( 盐)
evapotranspiration 蒸发蒸腾
expected value 期望值
explicit method 显式法
exploitation and management of water resources水资源开发与管理
exposure 露头
extraction w ell 开采井
F
fault 断裂 / 断层
fault spring 断层泉
feasible solution 可行解
Fick's law 费克定律
field capacity 田间持水量
finite difference method 有限差分法
finite element method 有限单元法
first law of thermodynamics 热力学第一定律
first order irreversible reaction 一级不可逆反应
fissure 裂隙
fit 拟合
flow equation 流动方程
flow line 流线
flow net 流网
flow meter 流量计
fluvial deposit 河流堆积,冲积物
flux boundary 流量边界
forecasting problem 预报问题
forw ard problem 正演问题
fossil w ater 化石水
Fourier transform 傅里叶变换
fractionation 分馏
fracture 裂隙
fracture spring 裂隙泉
free-surface 自由面
fresh w ater-salt w ater interface 咸淡水界面
fully penetrating w ell 完整井
fundamental equation for flow 基本流动方程
G
gaining stream 潜水补给河,盈水河
Galerkin method 迦辽金法
general head boundary 通用水头边界
geologic map 地质图
geometric mean 几何平均
geophysical method 地球物理方法
geostatistical model 地质统计模型
geothermal anomaly 地温( 热) 异常
geothermal energy 地热能
geothermal field 地热田
geothermal gradient 地温梯度
geothermal reservoir 热储
geothermal w ater 地下热水
geothermal w ell 地热井
geothermics 地热学
geothermometer 地热温标
geyser 间歇喷泉
Ghyben-Herzberg relation 吉本 - 赫兹伯格公式
glacial deposit 冰川堆积,冰碛物
glacial meltw ater 冰川融水
gobis 戈壁
governing equation 控制方程
granite 花岗岩
gravitational w ater 重力水
gravity dam 重力坝
gravity drainage 重力排水
greenhouse effect 温室效应
grey system 灰色系统
grid 格点,网格
ground penetrating radar 探地雷达
ground temperature 地温
groundw ater 地下水
groundw ater monitoring 地下水监测
groundw ater basin 地下水盆地
groundw ater composition 地下水组分
groundw ater divide 地下水分水岭( 线)
groundw ater management 地下水管理
groundw ater quality 地下水水质
groundw ater quantity 地下水水量
groundw ater regime under exploitation 地下水开采动态
grout curtain 灌浆帷幕
gypsum 石膏
H
half-life 半衰期
hardness 硬度
harmonic mean 调和平均
head loss 水头损失
headw ater ( 河流) 源头
heat capacity 热容
heat conductivity 热导率
heat exchange 热交换
heat flow 热流
heat pump 热泵
heat storage 蓄热
heterogeneity 非均质
histogram 柱状图
history matching 历史匹配
homogeneity 均质
hot dry rock 干热岩
hot spring 温泉,热泉
humic acid 腐殖酸
humidity 湿度
hydraulic conductivity 水力传导系数
hydraulic connection 水力联系
hydraulic contact 水力联系
hydraulic gradient 水力梯度
hydraulic head 水头
hydraulic head field mapping 流场绘制
hydrodynamic dispersion 水动力弥散
hydrodynamics 水动力学
hydrogen 氢
hydrograph 水文过程线
hydrologic cycle 水文循环
hydrologic map 水文图
hydrostatic pressure 静水压力
hydrostratigraphic unit 水文地层单元
hysteresis 滞后现象
I
ice core 冰心
identification of aquifer parameter 含 水 层
参数识别
igneous rock 火成岩
image w ell 虚拟井( 映像井)
immiscible flow 不混溶流
impervious fault 不透水断层
impervious formation 不透水层
implicit method 隐式法
in situ 原位
induced recharge 诱发( 导) 补给,激发补给
infiltration 入渗
infiltration capability 下渗能力
influence radius 影响半径
influent river 补给地下水的河流
initial condition 初始条件
injection w ell 注水井
injection-withdrawal system 抽 - 注水系统
interface 分界面
interfacial tension 界面张力
intermediate zone 过渡带
intermittent stream 间歇性河流
International Atomic Energy Agency 国际原子能机构
interpolation 内插法
interpretation 解译,解释
inverse problem 逆问题
ion 离子
ion activity product 离子活度积
ion exchange 离子交换作用
ionic strength 离子强度
ionization constant 电离常数
irregular mesh 不规则网格
irreversible process 不可逆过程
isothermal condition 等温条件
isotope 同位素
isotope exchange 同位素交换
isotope separation factor 同位素分馏因子
isotropy 各向同性
iteration 迭代
J
joint 节理
juvenile w ater 初生水
K
karst 岩溶
karst aquifer 岩溶含水层
karst collapse 岩溶塌陷
karstification 岩溶化
Kriging method 克里格法
L
lacustrine deposit 湖积物
lag 滞后
Lagrangian approach 拉格朗日法
laminar flow 层流
land subsidence 地面沉降
landfill 垃圾填埋场
landslide 滑坡
Laplace equation 拉普拉斯方程
latitude effect 纬度效应
law of conservation of mass 质量守恒定律
leakage 越流
leakage confined aquifer 越流承压含水层
leakage factor 越流因子
leakage formation 越流层
leakage phreatic aquifer 越流潜水含水层
leakance 越流系数
lens 透镜体
limestone 灰岩
limited resource 有限资源
line sink / source 线汇 / 源
lineament 轮廓
linear interpolation 线性插值
linear programming 线性规划
linear regression 线性回归
local flow system 局域( 部) 流动系统
loess 黄土
lognormal distribution 对数正态分布
longitudinal dispersion 纵向弥散
losing stream 亏水河,补给潜水河
lost river 流失河,失水河
low er confining bed 隔水底板
lumped parameter model 集中参数模型
M
macrodispersion 宏观弥散
macroscopic and larger scale study 宏观大尺度研究
macroscopic level 宏观水平( 尺度)
macroscopic value 宏观值
magmatic w ater 岩浆水
magnesium 镁
management of a groundw ater system 地下水系统管理
management problem 管理问题
marginal distribution 边缘( 际) 分布
mass spectrometer 质谱仪
mass transport equation 溶质运移方程
match 拟合,匹配
mathematical model 数学模型
maximum permissible concentration 最大容许浓度
mean residence time 平均滞留时间
measurement error 测量误差
median 中位数
mesh 网格
metamorphic rock 变质岩
meteoric and original formation w ater 大气降水与原生水
meteoric origin 大气水起源
meteoric w ater line 大气降水线
method of finite element 有限单元法
method of image 映( 镜) 像法,反映法
microscopic level 微观水平( 尺度)
microscopic scale study 微观( 小) 尺度研究
mineral spring 矿泉
minimum 最小值
model identification 模型识别
model parameter 模型参数
model w ith distributed parameter 分布参数模型
moisture content 含水率( 量)
molecule 分子
monsoon 季风
Monte-Carlo method 蒙特卡罗法
montmorillonite-illite transformation 蒙 脱石 - 伊利石转化
mountainous terrain 山区
multi-aquifer system 多含水层系统
multi-objective optimization technology 多目标优化技术
multiphase flow 多相流
multiple objective decision 多目标决策
multiple w ell systems 多井系统
N
natural boundary condition 自然边界条件
natural-attenuation 自然衰减
Neuman condition 纽曼( 流量) 边界
nitrate 硝酸盐
nitrogen 氮
noble gas 惰性气体
no-flow boundary 隔水边界
no-flux boundary 零通量边界
nonaqueous phase liquid 非水相液体
nonlinear equation 非线性方程
nonrenew able resource 不可再生资源
nonsteady flow 非稳定流
nuclear w aste repository 核废物处置库
nugget effect 块金效应
numerical dispersion 数值弥散
numerical method 数值法
numerical simulation 数值模拟
numerical solution 数值解
O
objective function 目标函数
observation w ell 观测井
observation w ell placement 观测井布置
one-dimensional consolidation 一维固结
one-dimensional flow 一维流
optimal solution 最优解
optimal yield 最优开采量
optimization problem 最优化问题
ordinary Kriging 普通克里格
organic compound 有机物
outcrop 露头
over-exploitation 过量开采
overland flow 坡面漫流
oxidation-reduction reaction 氧化还原反应
oxygen - 18 氧 - 18
P
paleoclimate 古气候
palaeokarst 古岩溶
parameter estimation 参数估计
parameter identification 参数识别
partial differential equation 偏微分方程
partially penetrating w ell 非完整井
particle tracking 粒子跟踪
path line 迹线
pellicular w ater 薄膜水
perched aquifer 上层滞水含水层
percolation 渗流
perennial stream 常年河
permeability tensor 渗透率张量
permafrost 永冻层
permeability 渗透率
permeable boundary 透水边界
permissible draw dow n 允许降深
pervious strata 透水层
phreatic aquifer 潜水含水层
phreatic surface 潜水面
piedmont 山前地带
piezometric head 测压水头
piezometric surface 测压水面
Piper diagram 派珀图
point source 点源
polar coordinate 极坐标
pollution of groundw ater 地下水污染
pollution source 污染源
polygon 多边形
polynomial 多项式
ponor 落水洞
porosity 孔隙度
positive definiteness 正定
postprocessor 后处理程序
potentiometric map 测压水位图
potentiometric surface 测压水面
precipitation 降水( 量)
prediction 预测
preferential flow path 优先流路径
preprocessor 前处理程序
pressure aquifer 承压含水层
pressure head 压力水头
primary porosity 原生孔隙
prior estimate 先验估计
probabilistic model 概率模型
probability density function 概率密度函数
profile 剖面
propagation 传播
protection zone 保护带
pump and treat system 抽出处理系统
pumping scheme 开采方案
pumping test 抽水试验
pumping w ell 抽水井
pyrite 黄铁矿
Q
qualitative ****ysis 定性分析
quantitative ****ysis 定量分析
quartz 石英
R
radioactive decay 放射性衰变
radioactive isotope 放射性同位素
radioisotope 放射性同位素
radius of influence 影响半径
rainfall 降雨
random process 随机过程
random variable 随机变量
random w alk method 随机行走法
Rayleigh distillation 瑞利分馏
Rayleigh effect 瑞利效应
reaction rate 反应速率
recession curve 衰减曲线
recharge w ell 补给井
recovery curve 恢复曲线
recovery test 恢复试验
regenerated w ater 再生水
regional groundwater flow 区域地下水流动
regression 回归
relaxation 松弛
remote sensing 遥感
renew able resource 可再生资源
replenishment 补充,补给
reservoir 水库
residence time 滞( 停) 留时间
residual draw dow n 残余降深
resistivity 电阻率
retaining w all 挡土墙
retardation factor 滞后因子
return flow 回归水流
Reynold's number 雷诺数
rift 裂谷
river bed 河床
rose diagram 玫瑰花图
rotation of coordinate 坐标旋转
S
safe yield 安全开采量
saline soil 盐渍土
saline w edge 盐水楔
saline-w ater encroachment 咸水入侵
saline-w ater interface 咸水界面
salinity 含盐量,盐度
salt dome 盐丘
sandstone 砂岩
saturated flow 饱和水流
saturation index 饱和指数
scale effect 尺度效应
scatterplot 散点图
Schoeller diagram Schoeller 图
screen 滤水管,筛管
screen diameter 滤水管直径
sea w ater intrusion 海水入侵
seasonal effect 季节效应
seasonal variation 季节变化
secondary interstice / porosity 次生孔隙
sediment 沉积物
sedimentary rock 沉积岩
sedimentation 沉积作用
seepage beneath a dam 坝下渗流
seepage velocity 渗流速度
sei**icity 地震强度
semiarid region 半干旱地区
semi-confining stratum 半承压层
semipervious layer 弱透水层
sensitivity ****ysis 敏感性分析,灵敏度分析
sew age disposal system 污水处理系统
shaft 竖井
shale 页岩
shallow dug w ell 浅井
shallow geothermal energy 浅层地温( 热) 能
sharp interface 突变界面
silicate 硅酸盐
sill 基台( 值)
simplex method 单纯形法
sink ( point) 汇( 点)
sinkhole 落水洞
sinter 泉华
sodium 钠
sodium bicarbonate w ater 重碳酸钠型水
sodium-adsorption ratio 钠吸附比
soil moisture 土壤湿度
soil moisture potential 水土势,土水势
solid solubility 固体溶解度
solid w aste 固体废物
solubility product 溶度积
soluble salt 可溶盐
solute 溶质
solution cavern 溶蚀洞穴
solution channel 溶蚀通道
solvent 溶剂
sorption isotherm 等温吸附线
source ( point) 源( 点)
source of pollution 污染源
source of w ater 水源
source / sink term 源汇项
specific discharge 单位流量
specific draw dow n 单位降深
specific heat 比热
specific retention 持水度
specific storage 比弹性给水度
specific surface area 比表面
specific w ell discharge 井的单位涌水量
specific yield 给水度
spring 泉
spring discharge 泉流量
stable isotope 稳定同位素
stagnation zone 停滞区
stalactite 石钟乳
stalagmite 石笋
standard deviation 标准差
state variable 状态变量
stationarity 平稳
steady flow 稳定流
step-draw dow n test 阶梯( 分级) 降深试验
Stiff diagram Stiff 图
stone forest 石林
storage coefficient 储水系数
storativity 储水系数
stream function 流函数
stream runoff 河川径流
streamline 流线
stress period 应力期
subcrop 地下露头,隐伏露头
subduction 俯冲作用
submarine spring 海底泉
subsurface w ater 地下水
sulfate 硫酸盐,硫酸根
sulfur - 34 硫 - 34
superposition 叠加
supersaturation 过饱和
surface runoff 地表径流
surface tension 表面张力
surface w ater 地表水
sustainability 可持续性
sustained yield 持续开采量
T
temperature effect 温度效应
tension 张力
tensor 张量
terminal lake 终端湖
terminology 术语
Theis equation 泰斯公式
thermal conductivity 热导率
thermal contamination 热污染
thermal reservoir 热储( 层)
thermal spring 温泉
Thiem equation 蒂姆公式
three-dimensional flow 三维流动
threshold pressure 临界压力
thrust fault 逆冲断层
tidal effect 潮汐效应
tidal efficiency 潮汐系数( 效率)
tide 潮汐
time lag 时间滞后
time step 时间步长
topography 地形( 学)
total dissolved solids 可溶性总固体,总溶解固体
total hardness 总硬度
tow er karst 塔状岩溶
trace element 痕量元素
trace metal 痕量金属
tracer 示踪剂
tracer test 示踪试验
transient flow 非稳定流
transition zone 过渡带
tran**issivity 导水系数
transverse dispersion 横向弥散
travertine 钙华
trial and error procedure 试算法,逐次逼近法
trilinear diagram 三线图
tritium 氚
tritium unit 氚单位
truncation error 截断误差
tufa 钙华
turbulent flow 紊流
tw o-dimensional flow 二维流
U
uncertainty 不确定性
unconfined aquifer 潜水含水层
unconfined flow 非承压水流
underground river 地下河,暗河
underlying surface 下垫面
United States Environmental Protection
Agency 美国环境保护局
unsaturated flow 非饱和流
unsaturated zone 非饱和带
unsteady flow 非稳定流
upconing 升锥
uplift 隆升( 起)
upper confining bed 隔水顶板
V
vadose w ater 渗流水
vadose zone 渗流带
variance 方差
variogram 变异图
vertical cross section 垂向剖面
void ratio 孔( 空) 隙比
volcanic rock 火山岩
W
w ater balance / budget 水均衡
w ater capacity 容水率
w ater content 含水量
w ater divide 分水岭( 线)
w ater level 水位
w ater pollution 水污染
w ater quality model 水质模型
w ater resources 水资源
w ater sampling method 采( 水) 样方法
w ater supply 供水
w ater table 潜水面
w ater table aquifer 潜水含水层
w ater-bearing zone 含水带
w ater-level fluctuation 水位波动
w ater-rock interaction 水 - 岩作用
w atershed 流域
w eathering 风化
w eighted function 权函数
w eir 堰
w ell function 井函数
w ell hydraulics 井水力学
w ell location 井位
w ell log 钻孔岩性记录
w ell loss 井损
w etland 湿地
w ettability 可湿性
w etting 湿润
Z
zone of aeration 包气带
zone of saturation 饱水带
python数据分析综合项目--空气质量指数分析
近年来,我国的环境问题比较严重,很多城市出现了雾霾天气,当然也有很多城市空气依旧清新,为了研究具体的空气环境城市分布,我们采用了假设检验以及线性回归的思想对AQI(空气质量指数)进行分析和预测,其中AQI的值越大,表示空气质量越差,AQI值越小,表明空气质量越好。
1.列出空气质量优秀/较差的五个城市
2.全国空气质量分布情况
3.临海城市和内陆城市的空气质量对比
4.影响空气指数的因素
5.空气质量均值验证
City 城市名
AQI 空气质量指数
Precipitation 降雨量
GDP 城市生产总值
Temperature 温度
Longitude 经度
Latitude 纬度
Altitude 海拔高度
PopulationDensity 人口密度
Coastal 是否沿海
GreenCoverageRate 绿化覆盖率
Incineration(10,000ton) 焚烧量(10000吨)
在进行数据分析之前,我们对数据集进行观察并对其中的缺失值、重复值、异常值进行处理
我们发现降雨量数据中包含了4个缺失值,为了保证数据的精确,我们查一下降雨量的数据分布
很明显的呈现右偏分布,因此采用平均数来替代缺失值并不妥,我们这里用中位数来代替
GDP属性中检测出8条异常值,我们这里采取用极端值替换的方式,将异常值替换成最大值
数据集处理完毕之后,我们开始进行数据分析
按照AQI降序排列,选出排名前五以及后五的城市,进行可视化,结果如下
结论:空气质量较好的城市为韶关市、南平市、梅州市、基隆市、三明市,空气质量堪忧的城市分别为焦作市、锦州市、保定市、朝阳市、北京市
这里我们将AQI指数分为六个等级,并根据等级统计全国空气质量的等级情况
我们再用散点图绘制下全国的空气质量分布
结论:我国城市的空气质量集中在一级、二级和三级,高污染城市比例较低;从地理位置来看,西部城市空气质量优于东部城市,南部城市优于北部城市。
根据上面的结论我们发现,仿佛临海城市的空气质量普遍高于内陆地区,那么这个结论是否是真的呢?还需要进一步验证。
首先,我们来统计下不同地理环境的城市数量
第二步,绘制临海和内陆城市的AQI分布图
我们发现内陆城市AQI集中分布在50-100区间内,而沿海城市AQI集中分布在0-50区间,在此样本中,沿海的AQI分布低于内陆城市,但是这毕竟是样本,无法推测出总体分布情况,还需进一步探测。
第三步,统计AQI均值并绘制分布密度图
第四步,差异检验,查看内陆沿海AQI均值分布是否显著
我们先假设内陆城市和沿海城市的平均值相同
结果得出支持的概率为0.006,远低于0.05,因此我们否定原假设,选择备择假设,即内陆城市和沿海城市的平均值不相同
结论:经过分析,我们发现有超过99%的概率可以证明临海城市空气质量优于内陆城市的空气质量。
为了探究影响空气质量的具体因素,我们需要计算出两个变量之间的相关系数,以此进行判断,这里采用热力图进行可视化操作。
结论:从显示结果看出,AQI主要受降雨量和纬度的影响,其中降雨量越多,空气质量越好(0.4);纬度越低,空气质量越好(-0.55)
当然,从整个图片来看,也能发现很多变量之间的关系,比如GDP与焚烧量的正相关系数达到了0.9,温度与纬度的负相关系数达到了-0.81等。
传闻空气质量均值在71左右,这个消息是否是准确的呢?我们进行一次验证。
首先计算样本的均值
结果显示为75.334
那么总体的均值是否为71呢?这里先假设总体的均值为71,进行t检验
结论:可以看出,偏离均值1.81倍的标准差,而且p值大于0.05,我们接受原假设(即空气质量均值在71左右)另外,我们还可以计算出在置信度为95%时,空气质量均值的置信区间为70-80。
HAD是什么意思
had的意思:v. 有;吃;得到(动词have的过去式和过去分词);aux. 已经(用于过去完成时和过去完成进行时)。
读音:英 [həd; əd; hæd];美 [həd,əd,hæd]
短语
had problems 有问题
had told 去完成时
had doing 过去完成进行时
had finished 去完成时 ; 已完成 ; 完成了
反义词
lack
英 [læk] 美 [læk]
n. 缺乏;无
v. 缺乏;不足
例句:Her decision seems to show a lack of political judgement.
翻译:她的决定似乎显示出缺乏政治判断力。
短语:lack absolutely 绝对缺乏