Search results

Thus, humanity is at risk especially as current studies reveal that the entombment of plastic waste engenders water, soil, and air pollution, as microplastics and nano-plastics manifest the propensity to disperse in the atmosphere [22].
In the dissolution stage, alkaline activators (M+(aq) + OH-(aq), where M = Na or K) dissolve the solid alumino-silicate material in the presence of water to form silicate and aluminate ions under a controlled pH.
The ion species then migrate to an equilibrium position with the elimination of a small amount of water and they interact by undergoing gelation/coagulation to form an aluminosilicate gel (Gel 1).
In summary, an optimal mixture was identified with a 6 % alkali dosage, a silicate modulus of 1.6, and a water-to-binder (W/B) ratio of 0.3, taking into account both mechanical properties and environmental considerations [37].
Educating and training construction professionals is essential to foster understanding and confidence in the use of geopolymer concrete.

Except the utilization of water, electricity, solar energy and biogas, other new energy has a poor technology level, without the self-development ability.
Energy-saving service companies (EMC) is a kind of professional company with the purpose of making money and is based on the operation of energy management contract mechanism.
This is a kind of professional energy service companies for the purpose to make profits.

As a result, management personnel shows different levels of professional knowledge and becomes disqualified for managing large-scale and complicated engineering projects, which brings the whole work efficiency of management organization down to a new low level.
(6) Backward management theories and methods Although the renovation project management of shanty towns sets up project management procedures and divides renovation project into several stages, the management at each stage is still limited to traditional administrative management in practical operation as a result of the deficiency in project managers’ qualities and professional knowledge, and the nine fields of knowledge regarding project management fail to be fully utilized.
The construction of such public infrastructures as road, water, power and gas supply, and drain of renovation project of shanty towns should be listed into the key project plans of investment that very year and organized to implement preferentially.

Southern area is rich for hydropower and the peak load is approximately equal to installed capacity, therefore it will send out power in high water season.
It opens a window for power system related professionals to understand the annual stability checking work in a real power system.

The Causal tree with possible injury factors for an incident, which may occur at a stationary welding point (Т1 - machine injury, Т2 - metal fume fever, T3 - burn, Т4 - gas cylinder explosion, Т5 - electrical hazards, Т6 - trip hazards of welding parts and structures, Т7 - sharp edges and surface roughness of welding structures, Т8 - sharp edges and surface roughness of equipment and tools, Т9 – machinery rotating and moving parts) To identify causes of each event an in-depth study of safety standards, technical documentation for welding works, safety guidelines for welders and feedback from qualified professionals in the field of welding were used.
To exclude backflash, while welding torch is hissing, it is necessary to do the following sequence of actions: close a propane valve, close an oxygen valve, cool a welding torch in clean water and clean a welding tip

It is opportune and economic in urban areas and isolates sites for several applications, including water pumping, electrical generation, batteries charging and other uses.
The reference [10] offers an easy presentation of the professional modelling and simulation of industrial structures using the SolidWorks software.
Kurowski, Enginering Analysis with CosmosWorks Professional (Finite Element Analysis with CosmosWorks), USA, Schroff Development Corporation, 2005

Construction Process is following: Measuring unreeling Installation template Crossed positioning Binding bottom reinforced and rib reinforced lay down the thin walled tube Binding stirrup reinforced Professional pipeline embedded Upper bound reinforced Concrete casting Concrete curing form removal The steel and thin hollow tubes are difficult to install.
Within 12h after pouring of concrete, the continuous wet water conservation should be kept for 24h. 2 layer sacks should be paved on the concrete, while protecting the surface by pouring water, and the curing time should not less than 14d.
The cast-in-situ concrete hollow floor system not only overcomes the traditional defects of precast concrete hollow floor system, such as short of integrity, span is small, easy to crack, water leakage, poor insulation, but also makes significant effort in the field of span.

O3 concentration were continuously monitored by O3 analyzers (S-900 Aeroqual, New Zealand), and were controlled by computers, using a professional program for O3 dispensing and monitoring.
Keep the experiment at uniform water and fertilizer, no other constraints such as pests and weeds.
Stoma of leaves is a channel exchanging material with the atmosphere, which controls two main processes of plant physiological－the balance of absorbing CO2 molecules in photosynthesis and the loss of water in transpiration.
It is conducted that O3 stress reduced the chloroplast photochemical reflection of soybean leaves, slowed down Hill reaction, reduced the photolysis and oxygen of water and the electronic efficiency of PSⅡ, eventually weakened photosynthesis.

But when uses the water coupling measurement, the stratum must be complete and can storage water .
When the working face is pushed to the monitoring point nearby, the coal body often is fragmentation, and it is unable to use water coupling measurement.
However, grouting reinforcement cause roadway supporting complex process to a certain extent, and the interference to production, and the production period is prolonged, and the strong technology need professional grouting and grouting equipment operation team.

The advantages and benefits provided by AE system over conventional, hydraulic based systems for subsea application have been proved by onshore and offshore tests and professional performance evaluation[1].
This system has a wide application, especially for oil and gas development in deep water.
With the increase of water depth, the requirements of safety and stability have improved.
Although water-based hydraulic oil is utilized, the affect on environment caused by emission and leakage of hydraulic system cannot be ignored.