The resent application and progress of non- quenched and tempered steel is reviewed. The mechanism of strength and toughness and the method to improve them are discussed. Some new research processes are presented，which include strengthening equation，solid solubility product equation of micro alloying elements，strengthening by intragranular ferrite （IGF），controlled rolling and cooling technology of non-quenched and tempered steel. The typical applications of various non-quenched and tempered steels in automotive industry are 1isted. The problems for the production and application of non-quenched and tempered steel in China are also analyzed. Some suggestions for enlarging future manufacture and applications in automotive industry are also put forward.
δ- transformation induced plasticity（TRIP） steel has performed high strength combined with excellent ductility，which satisfy the requirements for the third generation advance steels for automotive application. In addition，it could to be spot welded. It’s high potential to be industrialized for both manufacture and automotive application. The development of δ-TRIP，microstructure and mechanical properties，transformation and microstructure evolution，strength and toughness mechanism will be reviewed. The process and physical metallurgy for resistance spot welding will be discussed as well.
With the development of petroleum industry in China，undersea oil and gas development has gradually extended from shallow of the continental shelf to deep waters，therefore， high strength and high toughness and excellent resistance to lamellar tearing are the properties which heavy-gauge offshore platform steel must have in the future. This paper presents the research progress on high performance offshore platform steel at home and abroad in recent years，and the key technical problems of such steel production also be mentioned. Research work and engineering applications of high- strength plates in The State Key Laboratory of Rolling and Automation，such as Ultra Fast Cooling（UFC）and γ+α quenching technique，are finally reviewed.
This paper introduces the development status and existing problems of hot rolled dual-phase steel，and points out that the development and application of low-cost hot rolled dual-phase steel，F-B hot rolled dual- phase steel and high strength hot rolled dual- phase steel would promote the development of hot rolled dual phase steel and the process of replacement of cold rolled products by hot rolled ones in automobile industry. Strengthening mechanism and process control principle of hot rolled dual-phase steel strengthened by ferrite matrix with fine precipitates are also discussed. And the hot rolling experiments were carried out at laboratory.The hot rolled dual-phase steel strengthened by ferrite matrix with fine precipitates has been developed. This steel contains martensite islands and ferrite matrix distributing a large number of supersaturated precipitates and interphase precipitation of finer nano-sized TiC，whose tensile strength reaches up to 770~830 MPa with the yield ratio of less than 0.75.
In the present study，the production technology of transformation induced plasticity（TRIP）steel was firstly introduced in the steel tube manufacture field. The TRIP steel tubes with a microstructure of ferrite，bainite，retained austenite and a little martensite were successfully fabricated with both of the two-stage heat treatment technique and continuous heat treatment technique using a cold drawn steel tube. The ring tensile test and cold bending process were carried out to study the formability of the newly developed TRIP seamless steel tube. The results showed that the TRIP seamless steel tubes have a good cold formability，and they are available to be used in the tube hydroforming process. In addition，the equipment of continuous heat treatment developed in the current study can be used to produce TRIP steel tube and it may serve as an important reference for the industrial production of TRIP steel tube.
The tensile properties，impact toughness and hardness of the welded joints of DP590 low-cost hot rolled dual phase steel using appropriate welding wire，flux and reasonable welding process was studied. The excellent softening resistance，cold bending formability and low hardening tendency of the test steels was shown. Experimental results showed that the DP590 low- cost hot rolled dual phase steel with good welding performance was suitable for welding car wheels and beams，etc.
Numerical simulation and calculation were performed on the gas-phase flow field of the straight tangential cyclone with single entry，straight tangential cyclone with double entries， bias tangential cyclone with single entry，bias tangential cyclone with double entries，bias tangential helicoidal cyclone with single entry，bias tangential helicoidal cyclone with double entries by using RSM model. Results showed that，the pressure field and velocity field of the cyclone with double entries had better symmetry and stability；only changing the inlet angle had a limited influence on the pressure field and velocity field. When the tangential velocity distribution were similar in the six kinds of cyclone studied in this article，compared with other cyclones’， the pressure drop of the bias tangential helicoidal cyclone decreased about 25 %；the inlet total pressure needed was about 17 % lower；the energy consumption dropped about 17 %. Moreover，bias tangential helicoidal cyclone with double entries（XS-L type）had a better energy efficiency ratio，and its performance was the most excellent.
The correlation of exploration，mining，ore blending，processing and smelting sectors，which are considered to be series- coupled in mine engineering，is considered to be principal for mines. The corresponding geological grade，mining grade，milling grade，concentrate grade，charged grade all plays an important role in the general economical benefits of mines. Based on Five Grades Ganged（FGG）theory，an economic effectiveness model for mining grade benefits was established. The proposed model obeys the principle of ore conservation and metal conservation. Grade-profit activity index was proposed and analyzed via an example. The grade of optimization of a certain metal mine was obtained and the proposed model would establish a foundation for further study of the management mode in mining enterprises.
Through the indoor free load swelling rate test，Yichang City，a section of a highway reconstruction project of expansive soil were studied. Key analysis free load swelling rate of a non-load time，the proportion of mixed sand，the relationship between the initial dry density， experimental studies have shown that：Free load swelling rate is mainly divided into rapid expansion，slow expansion and eventually stabilize in three stages；during the initial dry density is constant，weathered sand soil free load swelling rate will increase the proportion of sand mixed with the rapid decrease slowly after the first lower，weathered sand soil modified free load swelling rate is not sensitive to the amount of sand mixed；in the same mixed sand ratio， weathered sand soil free load swelling rate increases with increasing initial dry density increases rapidly between them have a good linear correlation，expansive soil subgrade construction in progress when control of the initial dry density，to help reduce its swelling deformation，ensuring the stability of embankment.
Offshore wind farm is the latest direction of the wind power technology，with the further development of offshore wind farms technology，it is inevitable that future trend of offshore wind farms from offshore to deep sea. With increasing of sea- water depth，the cost of wind farm construction increased. The technology of floating wind turbine is an effective way to solve this problem. This paper systematically describes that early history，current situation and latest research of deep- sea floating wind turbine in the foreign academics，focuses on its theoretical analysis，simulation and hydrodynamic experimental，further refers to the shortcomings of that studies，accordingly propose some new research directions and ideas.
The dimensional effect of mortar cubic compressive strength was investigated through compression experiments on mortar cubic specimens with the strength grade M30, M50 and M80 and specimen side length of 70 mm,100 mm,150 mm and 200 mm. The relationship between the strength grade and dimensional effect was built in this paper. Furthermore, the computational equations of dimensional effect were proposed. Finally，good agreements were found between tested data and the computational equations.
The micrographs of diesel oil soot particles were achieved by transmission scanning electron microscope with and without water mist applied. It was seen by statistical analysis that the average diameter of soot particle increased and the surface density of soot particle decreased with water mist applied. The experimental results show that water mist washes out smoke mainly by dynamics effect，cloud physics effect and transportation mechanism of Steffen flow. This paper provides scientific references for water mist technology using in smoke scrubbing of computer room fires.
The existence of small packets in embedded Internet lead to low bandwidth efficiency and even congestion. The Nagle algorithm was applied by standard transmission control protocol（TCP）protocol to reduce the number of small packets. The paper builds embedded Internet network based on ARM7 32 bits micro control unit（MCU）and personal computer（PC）， analyses the principle and working mechanism of Nagle，and suggests an approach to resolve the temporary“deadlock”created by the interaction between the Nagle algorithm and the delayed ACK policy without modifying the Nagle algorithm through improving sampling frequency or filling the buffer in embedded system. The experimental results indicate that this approach is effective and reliable.
Combined with the cases of the track settlement led by non- engineering factor，the paper analyzed the reason and its hazard to the high speed railway track which are over the design and code standard，then concluded the correlation question type and gave out the suggestion and opinion，hoping to help solve the similar questions.