微耕机是指配套发动机标定功率不大于6.5kW、直接用驱动轮轴驱动旋转工作部件,以旋耕为主要功能,用于旱田耕整作业的步行操纵式机械,又称微型耕耘机.为减轻劳动强度,有必要降低微耕机振动对人体造成的伤害.影响微耕机振动的主要因素有:发动机的往复运动质量,发动机转速,微耕机质量,微耕机刚度,微耕机阻尼,被切屑土壤性质等.降低微耕机振动的主要方式有:阻断振动传递和扶手架自身属性的改变.微耕机在工作状态时,扶手架是人体与微耕机接触的唯一位置.因此微耕机扶手架的振动检测是整台微耕机振动检测的重中之重.

Microbial fuel cells(MFCs) were introduced in this paper in respects of their composition and structure.The principles and affecting factors of power generation and wastewater treatment related to MFCs were assessed,and the application of MFC technology was analyzed.Finally,the problems concerning the development of MFC technology were summed up.

The influencing factor of anaerobic fluidized bed microbial fuel cell(AFB-MFC) system for simultaneous carbon nitrogen removal and electricity generation were investigated.The results indicated that NH+4-N can not be removed by AFB-MFC,the voltage drop of AFB-MFC system was caused by the decrease of organic substrate concentration.Feeding enough electron donor to AFB-MFC system without adding NO-3-N,the increase of COD/TN was benefited for electricity generation of AFB-MFC system;AFB-MFC presented perfect performance for COD,NO-2-N and NO-3-N removal when 3 inorganic nitrogen were coexistence in AFB-MFC and C/N less than 1.37;AFB-MFC could achieve stable output voltage and power density when influent C/N ranged 1.37-2.50.Fixing the inlet C/N of AFB-MFC system,the NO-2-N,NO-3-N,COD removal efficiency of the system was still desirable even under high carbon nitrogen load,while NH+4-N removal efficiency was not satisfactory.The output voltage and power density of AFB-MFC system had not obvious change when increasing the carbon nitrogen load.Fixing the inlet organic substrate,the plenty of electron donor in AFB-MFC system could ensure the high NO-3-N,COD removal efficiency.The output voltage and power density of AFB-MFC system was increased to a stable value and then decreased with extension the operation time.

It was difficult to treat refractory and high-concentration chemical industrial wastewater effectively by single bio-chemical process.Fenton oxidation process was very effective in reducing the quantity of refractory compounds,so it could be used as pretreatment process in the chemical industrial wastewater treatment system.Series of Fenton treatment runs were performed on chemical industrial wastewater to determine the effects of pH,the proportion of chemicals,chemicals-feeding quantity and reaction time on the treatment efficiency.Orthogonal experiment results showed that the optimum treatment conditions were pH=3.5,chemicals proportion(FeSO4·7H2O/H2O2) of 125.0 mg/mL,chemicals-feeding quantity was 1.6 mL of 50% H2O2 and 200.0 mg of FeSO4·7H2O to per 100.0 mL wastewater.Under these optimum conditions,59.0% of COD and 37.4% of NH3-N could be removed in only 5 min.The results indicated that after pretreated by Fenton oxidation,the biodegradability of refractory chemical industrial wastewater was greatly improved and benefit to subsequent wastewater treatment.

Experimental Study has been conducted to investigate the impacts on the growth of Chlorella vulgaris from, phosphorus and nitrogen respectively. Specially, the Kse and KSN , which represent growth effects from phosphorus and nitrogen, were obtained by using the Monod Equation based on experimental results. The study suggests that impacts from TP overtake that from TN, with KSN 〉Ksp. While the level of Chlorella vulgaris peaks when the ratio of N/P reach 60.

A voxelization algorithm based on projection volume and octree is proposed.The projection volume of polygonal meshes on a voxel is used as a judging rule to decide its state:inside the body,outside the body.The calculation of the projection volume on a voxel is simplified by only considering the polygonal meshes that satisfy these two conditions:first,the projection area of the polygonal mesh intersects with the projection area of the voxel;second,the polygonal mesh locates on top of the voxel.A voxel in the octree structure is encoded with a "pedigree",which denotes its position in the octree and can be used for neighbor voxels finding.In this way,an area of inside voxels can be decided exclusively based on 6-neighborhood relationship as soon as an inside voxel is found.By checking the status of all voxels in an octree,all inside voxels can be found.The tests on some polygonal mesh models show that this algorithm is accurate and efficient,thus can be applied in GIS,geosciences modeling,CAD and other volume graphics related fields.

The research of MEMS fuze mechanism is getting practical access,and how to assemble these mechanisms has become a key technology.The appropriate assembly method can make the production efficiency of fuze MEMS mechanisms increased,and production costs decreased,thus the reliability and safety of fuze system ensured.In this paper,we analyze the necessities of studying micro-assembly of fuze MEMS mechanisms,discuss the status and development trend,and give proposals on developing micro-assembly of fuze MEMS mechanisms.

On the conditions that the general utility small gasoline engine's original main dimensions remain almost unchanged,and that its carburetor's original main dimensions remain a little changed,three measures can help to reduce fuel consuming rate.They are changing the carburetor's main metering orifice size to control oil mass,changing foam pipe's fuel road size to supercharge the fuel,and adopting multi-orifice sparging technical measures to fuel on the foam pipe's top.