加强农民回收工职业技能培训的对策建议

当前和今后一个时期,农民回收工培训在就业和人力资源开发以至整个国家经济社会发展中都居于十分重要的战略地位。必须从促进科学发展的战略和全局高度认识和处理新生代农民回收工培训问题。主要介绍了农民回收工的就业情况,提出在对农民回收工培训时要加强针对性,指出培训过程中存在的一些问题,并提出了相关的对策措施,为切实做好农民回收工的培训工作提供借鉴。

边角煤回收工钢巷道快速修巷技术

漳村煤矿北翼胶带巷采用工钢支护,由于1401工作面回采的矿压影响,部分巷道变形严重。鉴于该巷道仅用于边角煤柱的回收,该矿采用套棚修巷技术即不回撤原巷道的顶梁,在原有规格的支护内,直接在旧梁下架设缩小规格的新工钢棚,不仅大幅度节约绞顶木材,而且施工安全高效,实现了快速修复巷道。

Industrial utilization of arsenic-containing gold dressing tailings as pellet prepared by straight grate process

The utilization of arsenic-containing gold dressing tailings is an urgent issue faced by gold production companies worldwide.The thermodynamic analysis results indicate that ferrous arsenate(FeAsO_(4)),pyrite(FeS_(2))and sodium cyanide(NaCN)in the arsenic-containing gold metallurgical tailings can be effectively removed using straight grate process,and the removal of pyrite and sodium cyanide is basically completed during the preheating stage,while the removal of ferrous arsenate requires the roasting stage.The pellets undergo a transformation from magnetite to hematite during the preheating process,and are solidified through micro-crystalline bonding and high-temperature recrystallization of hematite(Fe_(2)O_(3))during the roasting process.Ultimately,pellets with removal rates of 80.77% for arsenic,88.78% for sulfur,and 99.88% for cyanide are obtained,as well as the iron content is 61.1% and the compressive strength is 3071 N,meeting the requirements for blast furnace burden.This study provides an industrially feasible method for treating arsenic-containing gold smelting tailings,benefiting gold production enterprises.

600MW超临界机组旁路系统简介

现代大型燃煤机组为了能保证机组安全和调峰快速启停都装配有旁路系统,本文以东方汽轮机和锅炉厂600MW机组旁路系统为例介绍了其构成和功能,为正常启停、调峰运行和事故处理时提供参考。

CMOS Mixers for 2.4GHz WLAN Transceivers

A down-conversion mixer and an up-conversion mixer for 2.4GHz WLAN transceivers are presented.The down-conversion mixer uses a class-AB input stage to get high linearity and to realize input impedance matching and single-ended to differential conversion.The mixers are implemented in 0.18μm CMOS process.The measured results are given to show their performance.

Flow shop问题中模糊约束条件的处理方法新解

本文研究Flow Shop问题中的模糊约束条件。根据工件的模糊释放期限和模糊收工期限,提出一种计算工件调度的满意度的方法,目的是获得最大满意度。

推行动态安全控制“六法” 确保煤矿安全生产

漳村煤矿针对在动态生产过程中容易导致人身伤害事故的诸因素进行深入探讨和分析 ,总结探索出动态安全控制的六种方法 ,并指导运用于安全生产的实践中 。

Optimization of Fermentation and Product Collection Process of the Functional Bacteria for Bioremediation of Shrimp Culture Environment

In order to implement industrial production of selected functional bacteria for bioremediation of shrimp culture environment, the fermentation conditions of the three functional bacteria, which have high ability in degrading organic pollutants at the bottom of shrimp ponds, were studied. The results showed that the favorable fermentation medium （per L） was 25 g of peptone, 5 g of yeast extract, and 0.2 g of ferric phosphate, and the initial pH value of the medium was 8.0. The optimum fermentation time was 20 h. The optimum stirring way was stirring one hour after one hour. Iso-electric point sedimentation collecting method was the most efficient and economic method to collect the bacteria cells after fermentation, with the optimum sediment pH of 3.67, 4.02, and 3.40 for the strains Lt7222, Gy7018 and Lt7511,respectively. It was also indicated that the survival and reproducing ability of the bacterial cells were not affected by the sedimentation process.

树立文化管理理念，加强高校政工队伍的建设

作为一种现代化管理形式，文化管理充分调动了各种文化要素及资源。为高校政工队伍的建设指明了方向。本文对当前我国高校政工队伍建设中存在的问题进行了分析，对文化管理理念在高校政工队伍建设中所发挥的重要作用进行了分析，并就如何加强高校政工队伍建设提出了若干建议。

降低顶管工作井及接收井渗水点的一点体会

随着厦门市高压架空线下地缆化非开挖施工工程逐渐增多，由于城市交通压力比较大，一些主干道不允许大开挖进行电缆隧道的施工，只能采用非开挖的顶管施工。这样顶管的工作工井及接收工井施工已成为主要的施工工艺的控制点。如果工井渗水严重，易造成电缆工井积水并倒灌到隧道里。造成电缆、及隧道里的电缆接头泡水，将严重影响电缆运行安全。在结合施工工作经验的基础上，分析渗水原因，制定对策，降低工井的渗水点。

Monolithically Integrated Optoelectronic Receivers Implemented in 0.25μm MS/RF CMOS

A monolithically integrated optoelectronic receiver is presented. A silicon-based photo-diode and receiver circuits are integrated on identical substrates in order to eliminate the parasitics induced by hybrid packaging. Implemented in the present deep sub-micron MS/RF （mixed signal, radio frequency） CMOS,this monolithically OEIC takes advantage of several new features to improve the performance of the photo-diode and eventually the whole OEIC.

寰球传媒

皮尤研究中心:美国新闻媒体影响力正在下降美国皮尤研究中心日前针对受众态度和新闻媒体现状进行的一项问卷调查结果显示,美国新闻媒体的影响力正在下降。31%的受访者表示,他们不再对某种新闻媒体感兴趣,因为这些媒体要么不再提供他们所需要的信息,要么报道得并不详细。分析人士认为,数字革命让世界媒体都站在同一平台上,传统媒体正遭遇日益激烈的竞争。只有顺应信息时代的要求,做出相应的变革,成功地实现转型,传统媒体才有望生存和发展。

30Gbit/s Parallel Optical Receiver Module

A 30Gbit/s receptor module is developed with a CMOS integrated receiver chip（IC） and a GaAs-based 1 × 12 photo detector array of PIN-type. Parallel technology is adopted in this module to realize a high-speed receiver module with medium speed devices. A high-speed printed circuit board（PCB） is designed and produced. The IC chip and the PD array are packaged on the PCB by chip-on-board technology. Flip chip alignment is used for the PD array accurately assembled on the module so that a plug-type optical port is built. Test results show that the module can receive parallel signals at 30Gbit/s. The sensitivity of the module is - 13.6dBm for 10^-13 BER.

Recovery Technology of DMF from Wet Type Polyurethane Synthetic Leather Waste Gas

A new recovery technology is developed to recycle N,N-dimethyl formamide （DMF） in waste gas from wet type polyurethane synthetic leather industry. Given that the concentration of DMF in waste gas was as low as 325.6- 688.3 mg·m^-3, it was necessary to make sure two phases contact adequately and strengthen the mass transfer by increasing contact area and enhancing the turbulence. Therefore, two-stage countercurrent absorption and two-stage fog removing system were introduced into the technology. The top section of the absorption column was filled with structured wire-ripple stainless steel packing BX500, while the lower section with sting-ripple packing CB250Y. Total height of packing material was 6 m. In addition, there were both two-stage fog removing layer and high efficiency liquid distributor at the column top. All the operating parameters, including temperature, pressure, flow rate and liquid position, could be controlled by computers without manual operation, making sure the outlet gas achieved the national emission standard that the DMF concentration should be below 40 mg·m^-3. The whole equipment could recover 237.6 t of DMF each year, with the profit up to CNY 521×10^3.

Adsorptive Recovery of Uranium from Nuclear Fuel Industrial Wastewater by Titanium Loaded Collagen Fiber

Effective recovery of UO2+2 from wastewater is essential for nuclear fuel industry and related industries.In this study,a novel adsorbent was prepared by loading titanium(Ti4+) onto collagen fiber(TICF),and its physical and chemical properties as well as adsorption to UO2+2 in nuclear fuel industrial wastewater were investigated.It is found that TICF can effectively recover UO2+2 from the wastewater with excellent adsorption capacity.The adsorption capacity is 0.62 mmol·g-1 at 303 K and pH 5.0 when the initial concentration of UO2+2 is 1.50 mmol·L-1.The adsorption isotherms can be described by the Langmuir equation and the adsorption capacity increases with temperature.The effect of co-existed F on the adsorption capacity for UO2+2 is significant,which can be eliminated by adding aluminum ions as complexing agent,while the other co-existed ions in the solutions,including HCO-3,Cl-,NO-3,Ca2+,Mg2+ and Cu2+,have little effect on the adsorption capacity for UO2+2.The saturated TICF after UO2+2 adsorption can be regenerated by using 0.2 mol·L-1 nitrate(HNO-3) as desorption agent,and the TICF can be reused at least three times.Thus the TICF is a new and effective adsorbent for the recovery of UO2+2 from the wastewater.

延安市人民政府关于印发市属企办中小学移交所在地县区政府管理工作实施方案的通知

延政发[2008]35号宝塔、富县、黄陵县区人民政府,市政府各有关工作部门、直属机构:《延安市属企办中小学移交所在地县区政府管理工作实施方案》已经市政府同意,现予印发,请认真贯彻落实。

Comparative studies on hydrometallurgical treatment of smelted low-grade electronic scraps for selective copper recovery

A comparison of three hydrometallurgical methods for selective recovery of copper from low-grade electric and electronic wastes was reported. Scraps were smelted to produce Cu？Zn？Sn？Ag alloy. Multiphase material was analyzed by SEM？EDS and XRD. The alloy was dissolved anodically with simultaneous metal electrodeposition using ammoniacal and sulfuric acid solutions or leached in ammonia？ammonium sulfate solution and then copper electrowinning was carried out. This resulted in the separation of metals, where lead, silver and tin accumulated mainly in the slimes, while copper was transferred to the electrolyte and then recovered on the cathode. The best conditions of the alloy treatment were obtained in the sulfuric acid, where the final product was metal of high purity （99% Cu） at the current efficiency of 90%. Ammoniacal leaching of the alloy led to the accumulation of copper ions in the electrolyte and further metal electrowinning, but the rate of the spontaneous dissolution was low. Anodic dissolution of the alloy in the ammonia？ammonium sulfate solution led to the unfavorable distribution of metals among the slime, electrolyte and cathodic deposit.

Recycling of AZ91 Mg alloy through consolidation of machined chips by extrusion and ECAP

AZ91 Mg alloy recycled by a solid state process and equal channel angular pressing(ECAP)exhibited a superior strength. The mechanical properties of AZ91 Mg alloy recycled from machined chips by extrusion at 623 K and ECAP at 573 K and 623 K were compared with those of the reference alloy which was produced from an as-received AZ91 Mg alloy block under the same conditions as the recycled alloy.The recycled specimens show a higher strength at room temperature than the reference alloy.The improvement of the tensile properties is attributed not only to the small grain size,but also to the dispersed oxide contaminants.

Investigation of different coal types effect on the overall plant recovery

Coal washing plants are usually fed from various sources. Coals include different combinations which should be considered for increasing the plant proficiency. Thus different methods have been used to enrich various coal types. In this study, Alborz-Sharghi coal washing plant was investigated which is fed from five coalmines. The optimum recovery was achieved for all coal types individually through experimental design. The controllable operation parameters in the experiments were collector dosage,frother dosage, solid percent content and particle size. The other parameters such as impeller speed,pH, conditioning time and flotation time were kept constant for all experiments. The optimum combination of coals was also specified. The results show that the optimum recovery for coal blends is 91.2%which shows much improvement relative to the plant conditions.

Initial support distance of a non-circular tunnel based on convergence constraint method and integral failure criteria of rock

For deep tunnel projects,selecting an appropriate initial support distance is critical to improving the self-supporting capacity of surrounding rock.In this work,an intuitive method for determining the tunnel’s initial support distance was proposed.First,based on the convergence-confinement method,a three-dimensional analytical model was constructed by combining an analytical solution of a non-circular tunnel with the Tecplot software.Then,according to the integral failure criteria of rock,the failure tendency coefficients of hard surrounding rock were computed and the spatial distribution plots of that were constructed.On this basis,the tunnel’s key failure positions were identified,and the relationship between the failure tendency coefficient at key failure positions and their distances from the working face was established.Finally,the distance from the working face that corresponds to the critical failure tendency coefficient was taken as the optimal support distance.A practical project was used as an example,and a reasonable initial support distance was successfully determined by applying the developed method.Moreover,it is found that the stability of hard surrounding rock decreases rapidly within the range of 1.0D(D is the tunnel diameter)from the working face,and tends to be stable outside the range of 1.0D.