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Online since: April 2014
Authors: Li Wei Zhang
For aggregate selection , was elected with fineness of the sand and gravel , the concrete increases with the amount of water it will , because water consumption increases , leading to concrete shrinkage increases, resulting in concrete cracking , was elected with mud large aggregates , as the clay content increases, the concrete shrinkage also increases the tensile strength decreased, resulting in concrete cracking .
Commodity concrete components than traditional concrete has undergone great changes: water-cement ratio and smaller, the amount of cement per unit volume increasing , decreasing cement fineness , new early strength cement production applications , including efficient water reduction agents , including the application of various chemical additives , ground admixtures , especially the use of silica fume .
Admixture requirement.Unless there are special requirements , in principle, to use the early strength agent and expanders, early strength agent when using expanders , there must be professional and technical personnel meansGuide and strengthen concrete curing .
Strict control of the sodium content of superplasticizer.Should be strictly controlled in the sodium content of water-reducing agent , unless there early strength requirements, generally do not make excessive growth of concrete strength .
Chaimo , cast slab structure template and supporting premature removal , likely to cause cracking slab structure , so the construction team should be based on professional units before form removal or construction unit with its own conditions of indwelling concrete block , concrete offers instars strength , in strict accordance with regulatory requirements guiding form removal .
Online since: November 2012
Authors: Zhi Dong Guo, Jia Liu, Cang Bo Li
Professional persons organize staff to sweep the old pavement, the old pavement pothole is filled up with 80% 1-3cm stones and 20% lime soil fill with 12% lime.
Recycling machine must be followed with professionals who check recycling depth, cement content and water rate at any time, and coordinate the machine operator to adjust the machine.
In the process of rolling, surface of the recycled mixture should always be wet, in the condition of its rapid evaporation, should spray water in time.
Rolling forming section should close traffic and water curing in time.
The marching speed of watering car keeps 20 kilometers per hour and can not turn over and brake and stay in curing section, besides that the curing time should not be less than 7d.
Online since: December 2010
Authors: Jan Karlshøj, Anne Dederichs
The six subjects were: Design (including fire strategy), Structural (including structural fire safety), Building Services (energy), Soil and Water mechanics, Urban planning/ Construction Management/ Facility Management, and Design Manager/ ICT Coordinator.
Multidisciplinary teaching - Engineering course in advanced building design, Journal of Professional Issues in Engineering Education and Practice, accepted for publication, 2010
Educating the 21st century construction professionals, Journal of professional issue in engineering education and practice, 2002
Online since: October 2011
Authors: Yue Feng Zhang, Guang Can Zhu, Xi Wu Lu
Besides, in those areas, the technology strength is incomplete, so are professionals of sewage treatment facilities, operation and management.
The tank of water-dropping aeration biological contact oxidation is to oxidize ammonia nitrogen to nitrate.
The sewage is then sprayed in the pulse composite filter media biological filter by an automatic siphon water distributor.
The self-purification capacity of water is fully mobilized relying on algae and bacteria symbiotic theory.
Geenens: Water Science and Technology Vol. 41 (2000), p. 21 [3] USEPA.
Online since: January 2014
Authors: Jun Li, Yu Hua Fan, Bin Xiao
The Chinese government attaches great importance to urban disasters , the Ministry of Construction and the State Environmental Protection Agency to develop a plan of urban disaster prevention and control objectives.Strengthening urban crisis embankment, dam reinforcement project risk , and to Shanghai , Linfen , Baoji three cities as a pilot area for disaster reduction , mitigation efforts to promote the launch of cities across the country , and the establishment of urban information system prediction and mitigation management systems and emergency systems, college established the natural disaster , in some universities have opened mitigation and professional courses , a number of research institutes as the main subject of disaster reduction , various forms of insurance business being conducted , have introduced a number of mitigation laws and regulations, and improve the anti- disaster agency[2].
City of geological disasters , including earthquakes , volcanoes ; collapses, landslides, mudslides ; land subsidence , ground subsidence, ground fissures ; mine water inrush , bumps, stomach roof,coal and gas outburst; coal burn white hot underground engineering harm;mine earthquake,loess liquefaction;soil erosion, desertification, salinization,land swamp;reservoir bank collapse,reservoir sedimentation volume , reservoir leakage , water flooded ; swelling melting ice , rising sea levels , sea people dip , coastal erosion , sea slump ; solid pollution, radioactive pollution categories[2].
Highway geological disaster prevention measures Ground subsidence disaster prevention.In most parts of China , mainly due to land subsidence mining underground freshwater resources are in excess.In view of this , the relevant departments need to do water work to alleviate the status of groundwater overexploitation .Under the National Water Diversion background, step outside basin of water, rational management of foreign water resources, efficient use of water resources and optimize the allocation of control due to over- exploitation of groundwater and land subsidence caused by the disaster .For areas of land subsidence has occurred , you can take steps to pressurized water aquifers , and mitigate or prevent ground subsidence .For a very large amount of land subsidence areas , should immediately stop or reduce the exploitation of groundwater to control land subsidence .At the same time , under the conditions allow artificial recharge , improve the water table , thereby preventing the further
By drainage, dewatering landslide water or reduce rain, snow , etc. into landslide , landslide fell reduce the force .Drainage including groundwater and surface water exclusion exclusion .Support can be excluded using the blind ditch landslide body of shallow groundwater ;Landslide external construction closure drains, surface water slide can be pooled , excluded.When surface drainage needs to be taken to avoid the occurrence of seepage , if necessary, can be used to perform masonry gully and ditch protection[7].
Conclusion First, the combination of highway geological disasters and ITS basic framework, make a key highway geological disaster prevention of intelligent transportation system; Second, analyzed the China mainly face the following kinds of highway geological disasters, ground subsidence, landslides, landslide and collapse, etc.; Third, recognizing the highway geological disaster to our country highway transportation has caused negative influence, in order to eliminate these effects, promote the stable development of highway traffic, combined with geological disaster prevention and control of professional advanced technology puts forward some measures of prevention and control.
Online since: December 2014
Authors: Paula Bajdor, Agnieszka Ulfik, Stefan Nowak
On the other hand, measures which affect economic development professionals, are processes of supply chains, which are easiest to measure in terms of their effectiveness and efficiency, as well as, these activities, traditionally, are the most important part of the business.
Below are some described solutions, that are used by companies to transform their traditional supply chain into a Sustainable Supply Chain: - water stewardship – the company shall endeavor to efficient use of water.
Due to the fact that several of the surveyed enterprises in their production processes use water, first they use the water of the highest quality, second, they treat water as a finite natural resource.
One of the innovative solution, such as the use of high-efficiency water reclamation system equipped with a specialized membrane bioreactor, has enabled the company to achieve the rate of water recovery on 75%, - emissions and energy use – all companies are aware that conducting their business, requires large amounts of energy, but also generates a high level of emissions of pollutants into atmosphere.
Online since: October 2013
Authors: Xiao Li Liu, Jun Deng
To ensure sufficient release of the nutrients in the pitaya seeds, the homogenizing operation was performed until no black pitaya seeds are observable. 1.2.2.2 Preparation of ingredients Water is added to citric acid and castor sugar, making them dissolved to such an extent that a solution of a specified concentration is prepared.
Hot water (approx. 60℃) was added to Xanthan gum and pectin to form a mixture, which is then stirred at a high speed before homogenization with a homogenizer. 1.2.2.3 Concentration by heating and preparation The pitaya pulp is concentrated by heating and well stirred in the thermostatic water bath for 10 min.
Finally, cold water is used to cool all the bottles thoroughly. 1.2.3 Optimization experiment of the formula Based on the concept of a single factor experiment, a four-factor, three-level orthogonal test (L9(34)) was conducted for the pitaya jam in terms of pitaya jam amount, sugar amount, citric acid amount and thickener amount. 1.2.4 Sensory evaluation The pitaya jam was stored for 6 weeks and submitted to 10 well-experienced professionals for sensory evaluation in terms of color, smell, fluidity and taste.
Effect of Citric Acid Amount on Jam Sensory Quality Citric acid amount, % 0.04 0.06 0.08 0.10 0.12 Sensory evaluation Cloyingly sweet and no sour taste Very sweet and light sour Moderately sour and sweet; good pitaya smell Slightly too sour and a light sweet taste Sharply sour and no sweet taste 2.1.4 Effect of thickening compound on lam’s sensory quality In jam production, as sugar content drops, jam gel will have deteriorating water retention capacity, which leads to water content loss and seriously affects product appearance.
The jam made under these conditions is featured by a grayish color, shininess, homogeneous texture, sourness & sweetness, palatability, consistent fragrance, softness flavor, no bad smell, a gelatineous form, no fluidity and no water content.
Online since: September 2013
Authors: Jin Suo Lu, Bo Zhang, Xu Zhang
The cluster analysis method was employed to explore the relationship between the outflowing water quality of the reservoir and the water quality of each longitudinal water layer to provide technical solutions for predicting the outflowing water quality of the reservoir and reducing the cost of water purification in the water plants effectively.
Their forecasts are more accurate, but their method is complicated, and it is difficult for non-professional personnel to operate.
Case Study of reservoir and its water quality The Jinpen Reservoir is the main source of water supply of drinking water in Xi'an.
Samples of the water layer above the water intake outlet, the water layer below the water intake outlet (the depth of water intake to be determined according to the actual on-site conditions), the water layer directly at the water intake outlet as well as the confluence pool of the Jinpen Reservoir are also taken and kept in 500mL polyethylene plastic bottles for laboratory monitoring and analysis.
Therefore, for the deepwater Jinpen Reservoir, when the water quality indicators of each water layer are divided into 3 clusters, the outflow water quality of the reservoir water supply can be predicted more accurately.
Online since: February 2007
Authors: Róbert Márkus, Oszkár Grega
Besides these, there are professional groups prepare practical propositions they can apply on federal level.
Further slag treatment takes place in the rest-bed by water spraying.
The primary goal of these test was to examine the interaction of slag and water.
We provided a stable amount of water through the system with the help of a pump.
After some time elapsed we took slag samples from the tubs and water samples from the rinsing water which we analyzed.
Online since: May 2013
Authors: Li Ping Sun, Jun Feng Yin
The adobe bricks and the timber are the local materials, and the houses are built no professionals involved in design.
Solar energy water heater should be installed in the slope roof.
With the help of the solar panels, solar heat can be collected to heat cold water stored by the water storage tank.
Through the pipeline, the heating water will be transported to toilet and kitchen, which can ensure enough warm water for use at ordinary times.
According to the lack of water resources in some part of this region, we should consider the design of rainwater recycling.
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