Abstract:In response to the hot issues involved in the laser cutting technology research such as the cutting system innovation ,cutting process simulation ,cutting efficiency and quality control etc .,this paper , on the basis of the principle and classification of laser cutting technology ,reviewed and analyzed the re‐search progress of the key generic technologies in such aspects as the laser cutting system ,the numerical simulation of temperature field/stress field ,the planning and optimization of cutting path ,and the predic‐tion and control of cutting quality .It also pointed out the current problems and the development trend in the future .

Abstract:To the rational distribution of rideshare sites in the pattern of "Internet + Traffic",the cus‐tom layout and bus stops were determined while excluded outlier reservation requests with density‐based outlier detection method and K‐means clustering analysis and coverage formula .Cases validation of analyti‐cal results show that the method is applicable to optimize the layout of rideshare sites of customized shuttle bus .

Abstract:With the trend of high-speed train development,the performance and reliability of bearing,a key component of high-speed train,are attracting more and more attention.This article introduces the development process of high-speed train and the primary application of railway bearing in trains,and predicts the development trend of high-speed railway bearing,which will better satisfy future demand for rail vehicles bearing.Parts manufacturers need to design new products to further improve the performance of the vehicle bearing and to expand the range of operating conditions and environment.

Abstract:Two common quantitative analysis methods on ethanol content,including gas chromatograpy（GC） method and potassium dichromate colorimetric method,are compared when they are applied to analyze the standard solution with certain ethanol concentration and fermentation liquor with unknown ethanol concentration.The analysis results show the GC method is more accurate and comes up with higher cost in quantitatively analyzing the ethanol concentration of fermentation liquor;and that the potassium dichromate colorimetric method can be applied as a cheaper alternative method to GC method in batch quantity analysis on ethanol contents of fermentation liquors.

Abstract:A comparative study has done on the purification efficacy and characteristics of tw o parallel biological aerator filters (BAFs) from campus septic tank effluent .The experimental results indicated that both of the two parallel biological aerated filter (BAF) could remove nutriuents (N and P) from septic tank effluent effectively ,and the NH4+-N ,TN and TP removal rate of one biological aerator filter (BAF) with two hybrid carriers reached 89 .5% 、90 .5% 、93 .7% ,while the corresponding removal rate was only 78 .7% 、81 .8% 、84 .4% by using one biological aerator filter (BAF) with one carrier .The mechanisms in‐volved that :1)the more complex biological system was created by a complex surface pore structure on hy‐brid carriers ;2) filamentous bamboo could be decomposed during the experiment and some microorganisms were reduced to a certain degree .

Abstract:Shallow geothermal energy,being a renewable and environmentally friendly energy and part of the geothermal resource,are gathering more and more attention,and has been put into use commonly in central heating and cooling as a good and clean substitute energy source.This paper introduces the utilization ways and points out that the proper exploitation of it can bring about a win-win both in economic benefits and in environmental gains.

Abstract:Removal of COD and ammounia-N from municipal wastewater by using an internal loop bio- reactor with ceramic honeycomb biocarriers is under study, and the article investigated the effect of hy- draulic load on the pollutants removal efficiency and characteristics. The results demonstrated that the COD removal ratio was decreased by 31.90% as hydraulic load increased from 0. 5 m3/(m2·h) to 1.5 m3/ (m2·h), but the ammonia-N removal ratio was deceased by 70.92% under the same conditions; the re- moval ratio of COD was 37.99% when hydraulic load was 1 m 3/(m2·h), with a removal load of 1.85 kg/ (m3·d) ; the removal ratio of NH3-N was 44.15%, and the volumetric load of ammonia-N was 0.83 kg/ (ma·d). And the indicative microorganism on ceramic honeycomb bioearriers displays regular changes with the increase in hydraulic load from 0.5 m3/(m2·h) to 1.5 m3/(m2· h).

Abstract:In order to solve the issue that the delivery service of the third party courier company and the self‐distribution system of electricity supplier cannot meet the requirements of consumers ,this paper ana‐lyzed the factors restricted the development of joint distribution model of community terminal express ,de‐fined its connotation and constructed its operational body and process as well as its collection and delivery system .It is crucial important on only in improving the operational efficiency and benefits of terminal dis‐tribution but also in promoting the information standardization ,operation regionalization ,and service cen‐tralization of express delivery .