基于在线监测设备的全水管理系统的设计与实现

重点分析了钢铁行业现阶段水管理系统现状和亟待解决的问题,介绍了基于在线监测设备的全水管理系统。通过增加在线监测设备、升级现有算法、分析实际案例经济效益,以及运用全水管理系统,能够确保水系统处于安全和平衡的最佳状态,减少维修次数和运行成本,提升工作效率,延长设备使用寿命,进而达到节水节能的环保工作目标。

海水源变频模块化冷热水机组在船舶中的应用

本文介绍了一种新型海水源变频模块化冷热水机组在某船舶中的应用,包括项目概况、负荷计算过程、机组比选和方案介绍等。并列出了全船空调整系统的原理图。

家庭空调方案选择的探讨

本文就家用中央空调在目前阶段的可行性作了简要的分析，并举例说明如何经济的选配中央空调和分体机。

浅析高层建筑暖通空调设计

一引言在经济、科技高速发展的现代社会,城市地价高昂,城市内部寸土寸金,文体场馆、宾馆酒店、写字大楼等无一不是以高层建筑的形式出现的,而且建设高层建筑已经成为了一种常态。越来越多的高层建筑拔地而起的同时,人们对生活、工作环境的舒适要求也对高层建筑的暖通空调设计带来了新的挑战。

Optimization of environmental maintenance system used in a refuge chamber

Mine refuge chambers are used to shield miners who fail to escape from the mine when incidents occur. Environment maintaining system plays a key role in stabilizing thermal environment of a mine refuge chamber against heat emitted from metabolism and transferred from outside. The safety and comfort of refugees are closely related to the environment maintaining system design. In order to improve the comfort of refugees, optimization on the environment maintaining system has been done based on the previous work. To evaluate the environment of the chamber, eight volunteers were involved into the experiment. Under close observation and safety protection, they lived in a heat-isolated test chamber for 106 hours. The volunteers were asked to maintain low level of activities to simulate refugees＇ situation. It shows that the environment maintaining system worked well and the temperature, relative humidity and emitted harmful air content such as CO2 and CO were all kept in the safety level, and no discomfort was felt by volunteers at all.

医院地下室冷暖空调方案设计

通过将天津市第三医院住院部地下室改造成为医疗行政办公室的工程实例，简要介绍“风冷式冷水机组＋风机盘管＋机械排风”空调方案的设计过程。该方案实施后，取得了院方满意、空调专业检测达标的效果，证实本设计方案技术先进，经济实用，具有推广使用价值。

Effect of Solving Models on Euler Vectors

In the process of solving Euler vectors based on GNSS horizontal movement field,the number of estimated parameters can affect Euler vector results. This issue is analyzed through theoretical deduction and practical example in this paper. Firstly,the difference between the results of Euler vectors in different solving models is deduced. Meanwhile, based on GNSS horizontal movement field in the Chinese mainland from 2004 to 2007,two common models( RRM and REHSM) are used to discuss the impact of solving models on Euler vectors and the follow-up study. The result shows that the maximum value of the difference in a block's entire rotation can reach 2. 6mm /a,and should not be ignored. Therefore,the results of horizontal movement are different using different kinematic block models,and this should be paid more attention in the analysis of crustal horizontal movement.

Experiment on Driving Precipitable Water Vapor from Ground-Based GPS Network in Chengdu Plain

The estimates of total zenith delay are derived using Bernese GPS Software V4. 2 based on GPS data every 30 s from the first measurement experiment of a ground-based GPS network in Chengdu Plain of Southwest China during the period from July to September 2004. Then the estimates of 0.5 hourly precipitable water vapor （PWV） derived from global positioning system （GPS） are obtained using meteorological data from automatic weather stations （AWS）. The comparison of PWV derived from GPS and those from radiosonde observations is given for the Chengdu station, with RMS （root mean square） differences of 3.09m. The consistency of precipitable water vapor derived from GPS to those from radiosonde is good. It is concluded that Bevis＇ empirical formula for estimating the weighted atmospheric mean temperature can be applicable in Chengdu area because the relationship of GPS PWV with Bevis＇ formula and GPS PWV with radiosonde method shows a high correlation. The result of this GPS measurement experiment is helpful both for accumulating the study of precipitable water vapor derived from GPS in Chengdu areas located at the eastern side of the Tibetan Plateau and for studying spatial-temporal variations of regional atmospheric water vapor through many disciplines cooperatively.

HPR1000： Advanced Pressurized Water Reactor with Active and Passive Safety

HPR1000 is an advanced nuclear power plant(NPP)with the significant feature of an active and passive safety design philosophy,developed by the China National Nuclear Corporation.On one hand,it is an evolutionary design based on proven technology of the existing pressurized water reactor NPP;on the other hand,it incorporates advanced design features including a 177-fuel-assembly core loaded with CF3 fuel assemblies,active and passive safety systems,comprehensive severe accident prevention and mitigation measures,enhanced protection against external events,and improved emergency response capability.Extensive verification experiments and tests have been performed for critical innovative improvements on passive systems,the reactor core,and the main equipment.The design of HPR1000fulfills the international utility requirements for advanced light water reactors and the latest nuclear safety requirements,and addresses the safety issues relevant to the Fukushima accident.Along with its outstanding safety and economy,HPR1000 provides an excellent and practicable solution for both domestic and international nuclear power markets.

Determination of the Absolute Rate of Sea Level by Using GPS Reference Station and Tide Gauge Data

The absolute rate of mean sea level of Xiamen area is derived from the data of Xiamen tide gauge station and Xiamen GPS fiducial station of crustal movement observation network of China（CMONC）. The height variation is discussed deeply in this paper, h is shown that height has periodic variations. So the rate of vertical land movement can not be precisely obtained only from several GPS campaigns. It is pointed out that the vertical crustal movement of tide gauge station should be monitored by using long-term continuous GPS observations.

Literature Review of Multi-illar Multi-level Old-age Security System

Since the 1970s, according to the international pension system reform trend for old-age social security system, no single institutional arrangement can ensure the functions of endowment security system to achieve the optimal.Therefore,how to based on the present situation of development, and to accurately, thus promote the resources integration, comprehensive build multi-level old-age security system, has important policy and practice significance.

Observation on Height Changes of Chinese Tide Gauges by GPS

The height changes of tide gauges directly influence sea level observation. For research of sea level variation in large region or globe, the land vertical displacement must be considered. Two sessions of GPS and absolute gravity observations in 2001 and 2003 are used to determine the horizontal and vertical motion of China coast in ITRF2000 and Eurasia frame. The difference between results of continuous observation and periodic observation is discussed.

Vulnerability assessment of water resources to climate change in Chinese cities

Climate change is an inevitable trend,which challenges security of water resources in China,especially in cities.Assessing vulnerability of water resource to climate change in cities has important role for policy makers. The paper constructs a vulnerability function,including exposure,sensitivity and adaptive capacity,according to the vulnerability concept proposed by IPCC,establishes an assessment indicators system of water resources to climate change in cities,and analyzes vulnerability features of Chinese cites based on 655 cities＇data in 2006.The vulnerability assessment results show that there are distinctive differences among all the cities,between east,central and west cities,between ordinary,big and mega cities,while there is no statistical significant difference between north and south cities.Based on the research,the paper suggests that strategic emphasis should focus on the central cities and ordinary cities

Design of High Precision Horizontal Control Network for Large-Scale Hydropower Project

A new solution of combination network of GPS and high precise distance measurements with EDM is proposed. Meanwhile, it’s inadvisable only using GPS network without distance measurements. Three schemes: terrestrial network, GPS network and combination network are discussed for horizontal control network design of Xiangjiaba Dam in view of precision, reliability, coordinate and outlay in detail.

Seepage characteristics of collapse column fillings

With concealment and hysteresis,water-inrush from Karst collapse column has become an important security hazard of lower group coal mining in North China.Based on the MTS8 15.02 seepage test system,we analyzed the impact of consolidation pressure,initial moisture content and confining pressure on the permeability of fillings in order to study the seepage characteristics of collapse column fillings.The results show that:(l)The permeability of collapse column fillings is of the order of 10^(-16)-10^(-15) magnitude and decreases with an increase in consolidation pressure and decrease in initial moisture content.(2) The essence of filling seepage law change is the change in porosity,and a power function relationship exists between the permeability ratio and porosity ratio.(3) With increasing confining pressure,the permeability of fillings decreases.However,under low confining pressure(1.2-4 MPa),the change of confining pressure has no obvious influence on the permeability.

The Global Science of Integrated Water Governance

Abstract： This study discusses the benefits of establishing a broader discipline of water science, based on the organizing mechanism of PES-W （payments for ecosystem services on the watershed scale）. PES-W is derived from an extension of governance analyses of 163 watershed-based PES （payments for ecosystem services） programs, and from the integrative decision mechanism of IPES （integrated payments for ecosystem services） to generalize the PES approach. PES-W reflects three interrelated perspectives fundamental to the global science of integrated water governance： （1） the ecological and economic perspective to integrate human incentives for integrated water resources governance; （2） the sociological and ecological perspective to form partnerships for meta-monitoring and recta-funding for integrated watershed governance; and （3） the scientific and sociological perspective to develop organizing botmdaries based on technology, lifestyle, entrepreneurship and organizing infrastructure for integrated aquatic ecosystem governance. This study is intended to communicate with the international scientific communities for establishing an advanced, academic, and practical multidisciplinary field of the global science of integrated water governance as a critical condition for sustainable development in human societies.

Discussion on Selection of Pulverizer and Moisture of Pulverized Coal for Lignite Boilers

In China,the abrasion index and the free moisture are regarded as the criteria for determining whether the medium-speed pulverizer or the fan pulverizer could be selected.Based on comprehensive studies on foreign methods for choosing the pulverizing system for lignite boilers,it is suggested that the particle size of coal,the drying time,the drying temperature and the humidity should be taken into account when measuring the free moisture of lignite,and the total moisture could also be the principle for type selection of pulverizer for lignite boilers.Furthermore,the determination of pulverized-coal moisture has great influence on the running of pulverizing systems.The actual moisture of certain pulverized coals is compared with that calculated with different methods and a feasible method for determining the moisture of the pulverized coal is suggested.

Utilizing of Methane from Polish Hard Coal Mines

The methane capturing and its utilization is of great importance for the safety in Polish coal mines. The present study deals with methods which are used to capture and utilize it in hard coal mines. It is of great importance to know that at present, ethane recovered in operating mines is obtained only through drainage systems whose implementation is enforced by health and safety regulations. Because of the fact that the amount of methane released in hard coal mines is expected to rise in years to come, as the methane content of coal seams increases with depth, heavy emphasis should be placed on methane recovery and the practical applications of the captured gas. If mine gas was officially recognised as a primary source for producing ＂environmentally friendly electricity＂, would open the perspectives of increasing methane utilization. In addition, the mining industry would gain an incentive to intensify methane recovery. It would be possible to carry out additional work focused on methane drainage from excavations which are not operated. Also, the costs of methane drainage could be included in the costs of energy production, which would undoubtedly have a positive effect on the profitability of mining companies.

A global empirical model for mapping zenith wet delays onto precipitable water vapor using GGOS Atmosphere data

The importance of water vapor in research of global climate change and weather forecast cannot be over emphasized; therefore substantial efforts have been made in exploring the optimal methods to measure water vapor. It is well-established that with a conversion factor, zenith wet delays can be mapped onto precipitable water vapor （PWV）. However, the determination of the exact conversion factor depends heavily on the accurate calculation of a key variable, weighted mean temperature of the trop- osphere （Tin）. AS a critical parameter in Global Positioning System （GPS） meteorology, Tm has recently been modeled into a global grid known as GWMT. The GWMT model only requires the location and the day of year to calculate Tm. Despite the advantages that the GWMT model offers, anomalies still exist in oceanic areas due to low sampling resolution. In this study, we refine the GWMT model by incorporating the global Tm grid from Global Geodetic Observing System （GGOS） and obtain an improved model, GWMT-G. The results indicate that the GWMT-G model successfully addresses the anomaly in oceanic areas in the GWMT model and significantly improves the accuracy of Tm in other regions.

Risk analysis for a cascade reservoir system using the brittle risk entropy method

The principal means of conserving water and utilizing hydropower in China is to exploit the use of a series of reservoirs in a cascade. This method and its inherent engineering safety problems are receiving increasing attention nowadays. In the field of engineering safety analysis, much work has focused on single reservoir projects in the past few years, but there is little research available on the safety risk analysis of cascade reservoirs, either within China or internationally. Therefore, a framework for risk analysis on the cascade reservoir system based on the theory of system engineering is constructed in this article. A cascading failure model is established and the connection degree factor discussed. In addition, the importance degree of the subsystem, which can be calculated by combining the analytical hierarchy process and the entropy weight method, is explained. According to brittleness theory of a complex system, brittle risk entropy is proposed as a performance index for measuring the collapse uncertainty of the cascade reservoir system. In addition, the brittle risk of the cascade reservoir system is predicted, which provides a reference for safety analysis in water conservation and hydropower construction projects in China.