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国内一般就是C.P.U.精品店跟Birkenstock专卖店有卖的，价位肯定比国外要贵一点，但绝对保证是正品，这个大可以放心，反正我是不太相信代购，因此经常是在实体店购买。价位的话，穿了多年勃肯了，也...
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Birkenstock（勃肯）是一个世界知名的德国凉鞋品牌，拥有超过二百多年的历史。品牌始祖名叫“Johann Adam Birkenstock”，根据...
MOXA推出无线AP与APClient设备
MOXA推出无线AP与APClient设备
MOXA推出户外用工业级无线产品，即为包括无线网络桥接器（accesspoint／bridge）与AP客户端设备（APClient）的AWK．1200系列。此系列的两项产品分别具备IP68及IP67防护等级的设计，可抵挡任何剧烈的环境天候。AWK-1200系列提供完整的功能与弹性的网络规划方式，使其成为户外工业应用部署无线网络的良好选择。AWK-1200系列产品不仅完全与IEEE802．11g／b兼容，且具有能够保护其不受尘土和水分影响的完整机构设计，同时，其两项产品亦符合IEEES02．3af以太网络供电（PoE，power-over-Ethemet）协议，使户外应用的电力来源更易于规划。
实验室少量制法为电解水，或是在二氧化锰(MnO2)作催化剂的条件下加热氯酸钾(KClO3)。
元素符号: O 英文名: Oxygen 中文名: 氧
相对原子质量: 15.9994 常见化合价: -2,-1 电负性: 3.5
外围电子排布: 2s2 2p4 核外电子排布: 2,6
同位素及放射线: O-15[122.2s] *O-16 O-17 O-18
电子亲合和能: 141.5 KJ·mol-1
第一电离能: 1314 KJ·mol-1 第二电离能: 3388 KJ·mol-1 第三电离能: 5300 KJ·mol-1
单质密度: 0.001429 g/cm3 单质熔点: -218.4 ℃ 单质沸点: -183.0 ℃
原子半径: 0.65 埃 离子半径: 1.32(-2) 埃 共价半径: 0.73 埃
常见化合物: H2O CO2 H2O2各种氧化物
发现人: 舍勒、普利斯特里、拉瓦锡 时间: 1774 地点: 英格兰/瑞典
名称由来:
希腊文:oxys和genes(形成酸的元素)。
元素描述:
无色无臭无味的气体，冷凝为淡蓝色液体。在宇宙中含量第三，是地壳中含量最丰富的元素，形成了大气的21%。
元素来源:
主要通过分馏液态空气获得。实验室少量制法为电解水，或是在二氧化锰(MnO2)作催化剂的条件下加热氯酸钾(KClO3)。
元素用途:
用于炼钢、焊接和维持生命。大气上层的天然臭氧层为地球阻挡了紫外线辐射。
Preface
Chapter 1．Streams and Rivers
1 General
2 Point Source Dilution
3 Discharge Measurement
4 Time of Travel
5 Dissolved Oxygen and Water Temperature
6 Biochemical Oxygen Demand Analysis
7 Streeter—Phelps Oxygen Sag Formula
8 BOD Models and Ki Computation
9 Determination of Reaeration Rate Constant K2
10 Sediment Oxygen Demand
11 Organic Sludge Deposits
12 Photosynthesis and Respiration
13 Natural Self—Purification in Streams
14 SOD of DO Usage
15 Apportionment of Stream Users
16 Velz Reaeration Curve （a Pragmatic Approach）
17 Stream DO Model （a Pragmatic Approach）
18 Bioloaical Factors
References
Chapter 2．Lakes and Reservoirs
1 Lakes and Impoundment Impairments
2 Lake Morphometry
3 Water Quality Models
4 Evaporation
5 The Clean Lakes Program
References
Chapter 3．Groundwater
1 Definition
2 Hydrogeologic Parameters
3 Steady Flows in Aquifers
4 Anisotropic Aquifers
5 Unsteady （Nonequilibrium） Flows
6 Groundwater Contamination
7 Setback Zones
References
Chapter 4．Fundamental and Treatment Plant Hydraulics
1 Definitions and Fluid Properties
2 Water Flow in Pipes
3 Pumps
4 Water Flow in Open Channels
5 Flow Measurements
References2100433B
Preface
上册
Chapter 1.Streams and Rivers
1 General
2 Point Source Dilution
3 Discharge Measurement
4 Time of Travel
5 Dissolved Oxygen and Water Temperature
6 Biochemical Oxygen Demand Analysis
7 Streeter—Phelps Oxygen Sag Formula
8 BOD Models and Ki Computation
9 Determination of Reaeration Rate ConstantK2
10 Sediment Oxygen Demand
11 Organic Sludge Deposits
12 Photosynthesis and Respiration
13 Natural Self—Purification in Streams
14 SOD of DO Usage
15 Apportionment of Stream Users
16 Velz Reaeration Curve （a Pragmatic Approach）
17 Stream DO Model （a Pragmatic Approach）
18 Bioloaical Factors
References
Chapter 2.Lakes and Reservoirs
1 Lakes and Impoundment Impairments
2LakeMorphometry
3 Water Quality Models
4 Evaporation
5 The Clean Lakes Program
References
Chapter 3.Groundwater
1 Definition
2 Hydrogeologic Parameters
3 Steady Flows in Aquifers
4 Anisotropic Aquifers
5 Unsteady （Nonequilibrium） Flows
6 Groundwater Contamination
7 Setback Zones
References
Chapter 4.Fundamental and Treatment Plant Hydraulics
1 Definitions and Fluid Properties
2 Water Flow in Pipes
3 Pumps
4 Water Flow in Open Channels
5 Flow Measurements
References
中册
Chapter 5.Public Water Supply
1 Sources and Quantity of Water
2 Population Estimates
3 Water Requirements
4 Regulations for Water Quality
5 Water Treatment Processes
6 Aeration and Air Stripping
7 Solubility Equilibrium
8 Coagulation
9 Flocculation
10 Sedimentation
11 Granular Media Filtration
12 Membrane Processes
13 Water Softening
14 Ion Exchange
15 Iron and Manganese Removal
16 Activated Carbon Adsorption
17 Residualfrom Water Plant
18 Disinfection
19 Water Fluoridatinn
References
下册
Chapter 6.Wastewater Engineering
1 What Is Wastewater？
2 Characteristics of Wastewater
3 Sewer Systems
4 Quantity of Wastewater
5 Urban Stormwater Management
6 Design of Storm Drainage Systems
7 Precipitation and Runoff
8 Stormwater Quality
9 Sewer Hydraulics
10 Sewer Appurtenances
11 Pumping Stations
12 Sewer Construction
13 Wastewater Treatment Systems
14 Screening Devices
15 Comminutors
16 Grit Chamber
17 Flow Equalization
18 Sedimentation
19 Primary Sedimentation Tanks
20 Biological （Secondary）Treatment Systems
21 Activated—Sludge Process
22 Trickling Filter
23 Rotating Biological Contactor
24 Dual BiologicaI Treatment
25 Stabilization Ponds
26 Secondary Clarifier
27 Effluent Disinfection
28 Advanced Wastewater Treatment
29 Sludge （Residuals） Treatment and Management
30 Wetlands
References
Appendix A.Illinois Environmental Protection Agency's Macroinvertebrate Tolerance List
Appendix B.Well Function for Confined Aquifers
Appendix C.Solubility Product Constants for Solution at or near Room Temperature
Appendix D.Freundlich Adsorption lsotherm Constants for Toxic Organic Compounds
Appendix E.Factors for Conversion
Index 2100433B
Oxygen概述