环境噪声

Present noise study and preliminary abatement design at public hearing as part of environmental document.

噪声的研究现状和公开听证会的初步设计，减少对环境文档的一部分。

The function of afforestation in city has many effects on environment.

城市绿化对环境的作用是多方面的，本文主要研究绿化对噪声的减弱作用以及各种绿地产生的不同效果。

Measurements and Analyses of the Vertical Distribution of Ocean Ambient Noise.

海洋噪声环境垂直分布测试和分析［J］。

The maximum speed is only limited by the material intensity of the rotor. So the AMB fits some execrably environments, such as high speed, vacuum super clean, etc.

磁轴承的功耗和噪声极低，能适用于多种复杂的应用环境，特别适合在高速、真空、超洁净等环境中使用。

Gestures (or visual languages, includes hand gestures and facial expressions) as a kind of assistant communication ways among human, are valid only in some special cases (such as in the very noisy surroundings or related to deaf mutes).

形体语言（或称视觉语言，包括手势和面部表情等）是人和人信息交互的一种辅助方式，仅在特定环境下（例如，噪声较大的环境以及涉及聋哑人的交互）才有独立功能。

Article 41 The Contractor shall take actions to control and handle environmental pollution or hazard caused by dust, exhaust gas, waste water, solid waste, noise or vibration, in compliance with applicable legislations and regulations of environmental protection and safety production.

第四十一条建筑施工企业应当遵守有关环境保护和安全生产的法律、法规的规定，采取控制和处理施工现场的各种粉尘、废气、废水、固体废物以及噪声、振动对环境的污染和危害的措施。

The paper investigates both block-type pilot linear minimum mean square error algorithm and IEEE802.16 OFDM channel estimation analysis. Simulation results confirm the block-type pilot structure is more suitable for IEEE802.16 system. An optimal pilot setting algorithm, based on space frequency domain, is explored and the pilot chart is presented. The proposed algorithm finds its application in MIMO-OFDM. Simulation results show the algorithm presents a good approximation to the perfect channel state information curve, with about 2dB difference in SNR. The simulation results also demonstrate the algorithm achieves fairly high stability in the environment of fast fading, performance of the proposed algorithm is better that of pilot training channel estimation.3. Taking into account the characteristics of IEEE802.16 OFDM system, OFDM system simulation platform is constructed in Matlab, exploiting simulink as a tool. OFDM modulation and demodulation simulation system are configured on LabVIEW platform. All the system signal processing is simulated, including defining system parameters, designing modulation model, and verifying all the proposed algorithms under different environments, such as white Gaussian noise, multi-path fading, with or without guard interval etc. Bit error performance is evaluated. The research provides valid theoretical basis for practical OFDM system performance evaluation.4. Taking advantage of software radio, the paper designs a hardware platform with both 256-IFFT/FFT and 512-IFFT/FFT OFDM schemes co-existing in one platform. You can predetermine one from the two schemes to carry out almost the same model function with different system performance and parameter setting.5. Referring to IEEE802.16 standard, the paper proposes a design method for generating signals and frames suitable for laboratory investigations implemented in laboratory environment.6. Based on 6701evm digital evaluation card, combined with analogy front-end, the paper designs a DSP software model to deal with baseband signal processing. An overall OFDM scheme, with modulation and demodulation function, is accomplished.

讨论分析了MIMO-OFDM中一种基于空频域的最优导频设置算法，给出了导频图案，通过仿真实验表明，该算法与理想的信道状态信息曲线非常接近，信噪比差距约在2dB左右，并且在快衰落条件下具有较好的稳定性，其性能要优于基于前导训练的信道估计方法。3、根据IEEE802.16OFDM系统特点，论文分别在Matlab中应用Simulink工具构建OFDM系统仿真平台、在LabVIEW平台上实现了OFDM调制解调仿真系统，模拟了整个系统的信号流程，进行了OFDM仿真系统参数的选择和调制模块的仿真设计、论证各算法性能，并根据各种不同的条件：例如高斯噪声、多径衰落、有无保护间隔等，对系统的误码特性进行了评估，为正确评价实际OFDM系统的性能提供了有效的理论依据。4、论文以软件无线电思想作为指导，提出了以256点IFFT／FFT为核心和以512点IFFT／FFT为核心的两种OFDM算法模式并存于同一个硬件平台、且可预选的方案，它们在参数选取和性能指标上有所差异，均实现了相似的模块和功能。5、论文参考IEEE 802.16无线网络标准的参数设置，针对本设计系统的应用环境和系统硬件的性能速率，提出了一种应用于实验室环境的信号结构、帧格式等参数设计。6、论文基于TI公司的6701evm数字评估板卡，结合模拟前端搭建数字中频平台，设计了基带处理的DSP软件模块并进行系统调试，基本实现了一套完整的OFDM调制解调方案。

Supply Taiwan 3 assist energy-saving axis sheds import environmental protection fan FP-108K brand: 3 assist dimension: 2220 × of 20 × 60mm voltage: AC230V wind force: 360CFM power: 46/40W revolution: 2850/3400RPM noise: 50/53DB producing area: Material of the casing outside Taiwan is qualitative: Aluminium alloy motor: Overspread extremely motor structure; Frame: Die-casting of aluminium alloy of the black lacquer that bake is anticorrosive, water-vapor proof structure; Wind leaf: High temperatu

供给中国台湾三协入口环境保护节省能源轴流风机FP-108K品牌：三协大小：220×220×60mm电压：AC230V风力：360CFM码率：46/40W转数：2850/3400RPM噪声：50/53DB生产地方：中国台湾外框材料：铝合金发动机：罩极发动机构架；范围：黑烤漆铝合金压铸防止腐败、防湿构架；风叶：耐温高塑胶扇叶；轴承：高细度、长命命双滚珠轴承；绝缘：漆包线使用B级绝缘，耐温高80慑氏度；绝缘电诅：800兆欧以上；耐电压：泻走电流0.5mA，耐电压2300V/1分钟；运行温度：-25慑氏度到+55慑氏度周围的环境温度40度时课接连着工作3200钟头储存温度：-25慑氏度到+55慑氏度

For example, green environment can improve the environment, release more oxygen, reduce niose, decrease the temperature, block the sand storm, and give everyone a good emtion.

例如绿化可以美化环境，释放氧气，减弱噪声，降低气温，阻挡风沙、改良环境，还可以保持人们的好心情。

The environmental impacting problems caused by 1000kV power transmission equipments such as audible noise, radio interference and electrostatic induction are more serious than those caused by 500kV power transmission equipments; meanwhile, due to the higher height of gravity centers of 1000kV equipments, the aseismic property of these equipments deteriorates, thus decreasing the influence on environment and intensifying the aseismic property of 1000kV power transmission equipments configured in Southeast Shanxi substation become the key points in the design of them.

相对于500 kV配电装置，1 000 kV装置可听噪声、无线电干扰及静电感应等环境影响问题更为突出，且设备安装高度及设备重心更高，使抗震性能降低。因此，降低环境影响、提高抗震性能成为晋东南1 000 kV配电装置设计的关键问题。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。