摘要:Saw about the effect of killing E. coli or TBC using either chlorine or chlorine dioxide and the effect when they were used together using the water collocated as the subject to study. The character of combination action was demonstrated by the Beranbaum formula. The result showed that 106. 18 of E. coli could be inactivated by 30 min action of 2. 00 mg/ L chlorine, 107. 18 of E. coli could be inactivated by 15 min action of 0. 30 mg/L chlorine dioxide, 10 min action of 1.50 mg/L chlorine and 0.20 mg/L chlorine dioxide; 100% TBC could be inactivated by 30 min action of 2. 00 mg/L chlorine, 15 min action of 0. 30 mg/L chlorine dioxide, 10 min action of 1. 50 mg/L chlorine and 0. 20 mg/L chlorine dioxide . The concentration ratio chlorine to chlorine dioxide when used together to kill E. coli was 0. 39 calculating with the Beranbaum formula, it was 0. 85 for the TBC. So the character of combination action of killing E. coli or TBC was cooperated.%以配置的水样为研究对象考察了氯与二氧化氯单独及联合灭活大肠杆菌和细菌总数的效果,用Berenbaum公式判断了两种消毒剂联合作用的性质.结果表明,氯2.00mg/L作用30 min可灭活试验水样中大肠杆菌6.18个数量级,二氧化氯0.30 mg/L作用15 min、1.50 mg/L氯和0.20 mg/L二氧化氯联合作用10 min可以灭活试验水样中大肠杆菌7.18个数量级(100%灭活);2.00 mg/L氯单独作用30 min、0.30 mg/L二氧化氯单独作用15 min、1.50 mg/L氯和0.20 mg/L二氧化氯联合作用10min可将水样中的细菌100%灭活.用Berenbaum公式计算得出氯与二氧化氯联合消毒灭活水样中大肠杆菌时质量浓度比为0.39,灭活水样中细菌总数时的质量浓度比为0.85,因此氯与二氧化氯联合消毒对大肠杆菌和细菌总数具有协同灭活作用.
摘要:利用小扰动飞行动力学方程和参数敏感性分析方法,研究了某非圆截面导弹在典型气动条件下的开环飞行稳定特性.对该导弹在不同静、动导数条件下的飞行稳定性进行了研究,得到了影响系统稳定性的主要因素以及出现较优横侧向稳定性的参数取值区间,这些结论为同类型导弹气动布局和控制系统的设计提供可靠的借鉴.%This paper discussed on the open-loop stability of a non-circular missile, with small-disturbance and parameter sensitivity analysis method. Researches were carried out on the flight stability of this missile at different static and dynamic derivative conditions. From these researches , the main influencing factors of the aircraft stability and parameter sections in which the aircraft have better lateral stability could be found. These results could offer reference for the aerodynamic layout and control system design of missiles of the same type.
摘要:The concept of nonlinear output frequency response functions was introduced to detect cracks in reactor coolant pump rotor using frequency domain information. Mathematical models of reactor coolant pump crackle failure are built in this method, and then using two sinusoidal excitation signals with different amplitude, frequency responses of vibration signals are got from nonlinear output frequency response functions, results of tests locate the failure position by calculating the failure eigenvalue of system frequency domain. Simulation indicated that this method performs well using Matlab program and Simulink toolbox; so that the method can be used for the detection of cracks fault diagnosis in reactor coolant pump.%针对非线性系统的故障诊断问题,采用非线性频率特性分析的故障监测方法,对主冷却剂泵转子的开裂纹故障进行定位识别.该方法建立主泵开裂纹故障的数学模型后,使用两个幅值不同正弦信号激励系统,从非线性输出频率响应函数得到主泵振动信号的频率响应,通过计算系统频域的故障特征值,定位出了裂纹故障的位置.使用Matlab和Simulink的仿真工具验证了该方法的有效性,因此该方法可以应用于主泵裂纹故障诊断的研究之中.
摘要:采用MTT法检测高三尖杉酯碱对HepG2细胞体外培养的抑制作用.将常规用96孔板培养的HepG2细胞作为空白组,其余分11个剂量的给药组,相应处理24、48、72 h.与空白组对照后,HepG2细胞的增殖被各给药组不同程度的抑制,并随着给药剂量的增加其抑制率也增加.高三尖杉酯碱在体外可有效的抑制人肝癌细胞的活性和细胞增殖.%This paper investigated the inhibition of homoharringtonine which effected on human hepatoma HepG2 cells by MTT, in vitro. 11 treatment groups of homoharringtonine (24, 48, 72 h) was designed to explore inhibition . Compared with control group, the inhibition rate was increased with the increase of homoharringtonine. The results indicated that homoharringtonine could inhibit the proliferation of HepG2 in vitro.
摘要:沸石分子筛因其特殊的结构特性对氨氮具有较高的吸附性能.将天然斜发沸石在250℃下高温改性,并用于含氨氮溶液的等温吸附处理,获得了在不同氨氮初始质量浓度下的改性沸石等温吸附曲线.根据朗格缪尔吸附理论拟合得到改性沸石的等温吸附方程1/qe=7.58986/Ce+0.13739,并求得其对氨氮的理论最大吸附量qm为7.278 6 mg/g.通过对沸石曝气生物滤池系统在不同水力负荷和气水比条件下的运行研究,总结出改性斜发沸石作为曝气生物滤池工艺的最佳水力负荷为0.15 ~0.25m3/(m2·h),气水比为20∶1.%Because of special structure characters, zeolite has high adsorption rate of ammonia nitrogen. The natural clinoptilolite was modified under 250℃ high temperature and used in isothermal adsorption of ammonia nitrogen contained solutions. Much isothermal adsorption curves were got in terms of different ammonia nitrogen initial concentrations. According to Langmuir adsorption theory, the Langmuir adsorption isotherm equation was that 1/qe =7. 589 86/Ce +0.137 39, which the most theoretical adsorption capacity qm was 7. 278 6 mg/ g. Through the operation of the zeolite biological aerated filter system under different hydraulic load rates and gas-water rate, the optimum operational parameters were given out with hydraulic load rates of 0. 15 ~0. 25 m3/m2·h and gas-water rate of 20:1.
摘要:根据质量守恒定律和化学方程式左右两边的原子构成建立数学模型,将化学方程式的配平问题转化为最优化求解问题.采用差异演化算法对其进行求解,给出基于差异演化算法的化学方程式配平的具体操作过程.通过对仿真实例的计算,结果表明差异演化算法能有效地确定出任意一化学方程式各物质前的最简系数,完成化学方程式的配平,为任意一化学方程式的配平问题提供了行之有效的方法.%According to the theme of mass conservation and basing on the atomic through the two side of the chemical equation, the mathematical model was established, transform the problem of balancing chemical equation to be the optimized solution question. Differential e-volution was used to balance the chemical equation and the detailed realization of the algorithm was illustrated. The result of the experiment indicate that differential evolution can determine the most predigest positive integer coefficient which was in front of arbitrary chemical equation' s each materials effectively, balance chemical equation, and put forward a new effective method to balance arbitrary chemical equation.
摘要:In this paper, the conditions of unipotent of the free group of rank two were discussed. The sufficient conditions of unipotent were given when group could be mapped into matrix group of rank eight.%研究了二元生成自由群的幂单性,在其可以映入八阶矩阵群时,给出了其幂单的充分条件.
摘要:In order to better monitor the status of work leaves, research on leaf temperature is necessary. Based on analysis of leaf temperature data collected in the temperature trends in the work, this paper summarized the changes in the peak period. Using equally spaced single leaf blade segmentation algorithm to extract the data collection, the mathematical model of temperature distribution was established to provide the basis for the detection of leaf temperature.%为了更好的监测叶片的工作状况,对工作叶片温度分布特征进行研究.根据采集的温度数据分析叶片在工作中温度的变化趋势,总结周期与峰值的变化.采用等间距的叶片分割算法提取单一叶片的采集数据,建立温度分布的数学模型,为叶片温度的检测提供依据.
摘要:Heilongjiang province is an important grain producing areas in China and has a special strategic position in the protection of food security. Heilongjiang province has conducted the food engineering in recent years. The grain production achieves one hundred billion, reaching 501. 3 billion kilograms in 2010. Food commodity rate and adjustments are all ranking the first of the country. But grain production advantages do not simply transformed into economic advantages. There are many reasons and the agricultural product processing industry are not advanced, besides a short chain of agricultural industries and the ability of appreciation is so weak should not be ignored. Based on the analysis of the present agricultural product processing industry situation in Heilongjiang, this paper put forward the development of countermeasures about the processing of agricultural products such as create the good policy environment and go a "green"way.%黑龙江省是我国重要的商品粮基地,在保障中国粮食安全问题上具有特殊的战略地位.近年来,黑龙江省实施千亿斤粮食工程,2010年粮食总产达到501.3亿kg,粮食商品率与调出量均居全国首位.然而黑龙江省粮食生产优势却没能转化成经济优势,其原因固然是多方面的,但农产品加工业滞后,农业产业链条短,增值能力弱却是不容忽视的问题.在分析黑龙江省农产品加工业现状基础上,针对黑龙江省农产品加工业发展存在的主要问题,提出了创造良好的政策环境、打“绿色牌”走特色路等加快黑龙江省农产品加工业发展的对策建议.
摘要:研究发现在临床上磷酸川芎嗪的各种剂型里使用最多的是注射给药.相关报道中注射用磷酸川芎嗪在使用时经常与其他药物配合使用,且联合用药时易发生配伍变化.对这些配伍变化进行归纳总结,旨在提醒广大医药工作者在研究和使用磷酸川芎嗪注射液时应给予重视.%Ligustrazine phosphate was used in injection in clinical. In the relevant reports, injection of ligustrazine phosphate was in conjunction with other drug and prone to changing compatibility. In order to remind the medical workers, in this paper, many changes of compatibility were summarized.
摘要:Using fsodium alginate, sodium transglutaminase, amylase, locust bean gum, gum artemisia, diacetyl tartaric acid single ( double) glycerol, sucrose fatty acid ester SE - 13 , sucrose fatty acid ester SE — 11, gum arabic, poly glutamic acid by single factor experimental methods,this paper studied on the affection that significantly improve the characteristics of frozen dough. The results showed that effective ones are sucrose fatty acid ester SE - 13, locust bean gum, diacetyl tartaric acid single (double) glycerol on the sensory quality of frozen bread, followed by sodium alginate, sodium transglutaminase amylase, artemisia gum, sucrose fatty acid ester SE - 11, gum arabic, poly glutamic acid.%采用海藻酸钠、谷氨酰胺转胺钠、淀粉酶、刺槐豆胶、沙蒿胶、双乙酰酒石酸单(双)甘油酯、蔗糖脂肪酸酯SE-13、蔗糖脂肪酸酯SE-11、阿拉伯胶、聚谷氨酸,通过单因的实验方法,研究各个改良剂对冷冻面团的改善效果、研究结果表明.蔗糖脂肪酸酯SE-13、刺槐豆胶、双乙酰酒石酸单(双)甘油酯对冷冻面包感官品质的影响最大,其次是海藻酸钠、谷氨酰胺转胺钠、淀粉酶、沙蒿胶、蔗糖脂肪酸酯SE-11、阿拉伯胶、聚谷氨酸.
摘要:With the rapid development of computer technology, virtualization is playing an important role in computer system, wherein memory virtualization is an essential aspect. Recent advance in hardware technology enables MMU (Memory Management Unit) integrated in processor, which is of significance to lower the overhead of memory virtualization. In this paper , MMU virtualization mechanism in terms of hypervisor for SPARC T2 multi - core was investigated in great details. In - depth analysis reveals that hypervisor APIs and TLB missed related exceptions become the important overhead factors. Experiment results demonstrated that data_real_translation_miss, IMMU_miss_HWTW and mmu_ map_addr become the primary sources of overhead for MMU virtualization, confirming that MMU virtualization incurs negligible overhead.%虚拟化技术在计算系统中的作用日益重要.越来越多处理器内集成了MMU内存管理单元为内存虚拟化提供支持.基于SPARC平台,对hypervisor MMU虚拟化机制进行深入探讨,并对虚拟化代价进行分析:MMU虚拟化代价主要来自于Guest OS对MMU操作时的hypercall调用以及访存异常的处理代价.实验表明:data_real_translation_miss,IMMU_miss_HWTW和mmu_ map_addr等hypervisor API和异常处理成为MMU虚拟化代价的重要因素,MMU支持下hypervisor虚拟化引入了很小的性能开销.
摘要:In view of the sub-prime crisis, the effect of the US financial crisis on China is being more and more , China' s stock market has been more serious impacted. This paper used ARCH family of models to analysis the logarithmic return level and the risk level of Shanghai A -share before and after the financial crisis. The results showed that; the level of return was 0.002 533 before the financial crisis, the level of return reducese to -0.003 049 after the financial crisis, a significant reduction in return level, the risk level was 0.051 759 before the financial crisis, the level of risk is 0.058 045 after the financial crisis, the level of stock market return level was reduced and risk level was increased after the financial crisis.%鉴于次贷危机的爆发,中国受到美国金融危机影响的持续时间在扩大,中国的股票市场受到了较为严重的冲击.我们有必要利用ARCH族模型在金融危机发生前后对上证A股的对数收益水平和风险水平进行实证分析.分析结果表明,金融危机前收益水平为0.002 533,金融危机后收益水平降低到-0.003 049,收益水平降低的幅度较大.金融危机前风险水平为0.051 759,金融危机后风险水平为0.058 045,金融危机发生后股市收益水平降低,风险水平增加.
摘要:Circulated sintering experiments were conducted with the hot air generating device for pot sintering. The effect of oxygen content and temperature on the circulating sintering was analyzed. And the result showed that the increase of oxygen content had little effect on the improvement of sintering process when the oxygen content was over 18%. However, when 100 ~ 250 ℃ hot air exhaust circulating sintering method was combined with the improvement of lime quality, it could significantly meet the technical standards of tumbler index and also reduce the fuel consumption per unit.%利用项目研制的烧结锅热风发生装置,进行了循环烧结的实验.研究了含氧量、温度对循环烧结的影响,研究结果表明含氧量大于18%时,含氧量的提高对烧结过程的改善不显著,而在加入部分生石灰后采用100~250℃热废气循环烧结,不仅可以改善转鼓强度等技术指标,还能有效的降低燃料单耗.
摘要:homoharringtonine; MTT; anticancer ; HepG2 cellsThis paper studied on the antitumor effect of Scutellaria barbata D. Don polyaccha-rides( SBP) on mice bearing S180 tumor. The effect of SBP on tumor growth and IL -2 INF -content were detected by ELISA detection method. The result showed that SBP could inhibit the growth of S180 and the effect of middle dose group was the best. Meanwhile, SBP could improve IL -2 and INF - a activity. This indicated that SBP could inhibit tumor S180 growth.%探讨半枝莲多糖对体内S180肉瘤肿瘤抑制作用及相关机制.采用动物移植性肿瘤实验观察半枝莲多糖对小鼠体内肿瘤细胞生长的影响,ELISA法检测对荷瘤小鼠外周血血清中白细胞介素-2和干扰素-α质量浓度的影响.结果显示,半枝莲多糖对S180肉瘤生长的抑制率以中剂量为佳;各剂量组均对脾脏指数有显著性差异,能够提高S180荷瘤小鼠外周血血清中白细胞介素-2及干扰素-α的质量浓度,但中剂量最为显著,表明半枝莲多糖在小鼠体内具有抑制S180肉瘤的作用.
摘要:建立胃舒康片含中芍药苷量的测定方法.采用高效液相色谱法定量分析含芍药苷量,使用Alltima-C18(5μm,4.6 mm×250 mm)色谱柱,流动相为甲醇-水-冰醋酸(25∶75∶0.2),流速为1mL/min;进样量为10 μL,检测波长为230 nm.经过系统性研究,测得平均回收率为100.42%,RSD为1.05%(n=6).该方法操作简易,专属性及重现性好,可有效地控制胃舒康片的质量.%To establish a method for the determination of paeoniflorin in weishukang tablets. Conducted determination of paeoniflorin in this drug by HPLC. Chromatogram condition; Selected Alltima - C18(5 μm,4.6 mm×250 mm), mobile phase; methanol - water - acetic acid(25: 75- 0.2) , speed of flow was 1.0 mL/min. The injection volume was 20 μL and the detected wavelength was 230 nm. The average recovery was 100. 42% ,RSD was 1.05% ( n = 6). This method was simple, rapid, accurate and reliable .
摘要:This paper studied on the determination influence of lycopene content in unpurified extract by different testing methods. Lycopene was extracted in dark by acetone, ethyl acetate and hexane in the low temperature. Lycopene was scanned in 300 ~ 600 nm by UV - vis spectrophotometer and detected content by HPLC. The spectra of acetone unpurified extract in 300 ~ 600 nm was a wide peak form, but UV - visible spectra of ethyl acetate and hexane were similar to the spectra of lycopene standard substance. It was proved that acetone unpurified extract contained lycopene by HPLC. lycopene contents in the same acetone unpurified extract were 4.76 mg/mL and 2. 19 mg/mL, detected by UV spectrophotometry and HPLC respectively. The extraction method did not influence the UV - visible spectra of acetone unpurified extract. Lycopene content in acetone unpurified extract cannot be detected by UV spectrophotometry.%研究不同测定方法对番茄红素粗提液质量浓度测定的影响.以丙酮、乙酸乙酯和正己烷在低温、避光条件下提取番茄红素,并在300~600 nm区间进行紫外可见光谱扫描,再用HPLC法测定粗提液中番茄红素质量浓度.丙酮粗提液300~600 nm区间的紫外可见吸收光谱图呈一宽峰,而乙酸乙酯和正己烷粗提液的紫外可见吸收光谱与番茄红素标准品相似.HPLC法证明丙酮粗提液中确实含有番茄红素.用紫外分光光度法和HPLC法测定同一丙酮粗提液中番茄红素质量浓度分别为4.76 mg/mL和2.19 mg/mL.番茄红素丙酮粗提液的紫外吸收光谱图呈一宽峰并非受浸提方法的影响,可能与浸提溶剂有关,因此番茄红素的丙酮粗提液不能用紫外分光光度法进行质量浓度测定.
摘要:通过分析硝化细菌的硝化性能及种属类别,研究了高铁酸盐与高锰酸盐预氧化对后续生物活性炭工艺中硝化细菌微生物特性的影响.研究结果表明,预氧化作用并没有改变后续生物活性炭工艺中硝化细菌的种属类别,但可通过提高硝化细菌的硝化性能,改善生物活性炭工艺的除氮效能.%By analyzing the nitrification and species of nitrifying bacteria, the effect on nitrifying bacteria characteristics in BAC process followed with the preoxidation of potassium permanganate and potassium ferrate was conducted. The results showed that the species of nitrifying bacteria on the carbon did not change, and the effect of nitrogen removal in BAC process was enhanced by preoxidation.
摘要:Nanoporous titania powder was prepared under sol - gel hydrothermal conditions by employing EO20PO70EO20(P123) as template, and characterized by means of FT-IR,XRD, UV diffuse reflection and N2 adsorption - sorption. The effect of the pH value on the crystal phase was discussed, and the photocatalytic performance of TiO2 powder was evaluated using rhodamine B (RhB) as a model pollutan. The results showed that the nanoporous anatase titania powders with particle size 12. 7 nm, most probable pore size 17. 8 nm, a wide pore size distribution from 5 to 35 nm and specific surface area up to 68 m /g were prepared under the acid condition, and the powder had the best photocatalytic activity, however, porous titanium dioxide powder with the mixed anatase and the brookite was prepared under the base condition.%以EO20PO70EO20 (P123)为模板剂,采用溶胶-凝胶-水热法,制备介孔TiO2纳米粉体.利用红外、X射线衍射、紫外漫反射、氮气吸附脱附等手段对样品进行了测试.研究了体系的pH值对材料的晶型的影响,并以染料罗丹明B(RhB)作为模型污染物,考察粉体的光催化能力.结果表明,在酸性条件下可获得粒径为12.7 nm,平均孔径为17.8 nm,孔径分布较宽(5~35 nm),比表面积为68 m2/g的纯锐钛矿型介孔TiO2纳米粉体;而碱性条件下,可获得锐钛矿相和板钛矿相混晶介孔二氧化钛粉体;并且酸性条件下制备的粉体光催化效果较好.
摘要:利用有穷自动机理论对“企业车辆管理”的生命周期状态转化进行了形式化描述.通过分析车辆管理的流程,得到了车辆管理所涉及的各项业务流程,并对各项业务进行了说明,使得车辆管理的业务流程更加清晰.%In this paper, the state transformations of the life cycle of the corporate vehicle management were described by finite automata. By analyzing the process of vehicle management , various business processes could be got and be described, which were more clearly to business processes of the vehicle management.
摘要:Burning of combustible forest material basis, fuel moisture changes to a certain extent determines the formation of a fire, so the fuel moisture model for the study of changes in fuel moisture is very helpful; this is through the establishment of fuel moisture model to of fuel moisture changes. Considered the meteorological factors on the time lag fuel moisture conditions , the results showed that fuel moisture by the impact of meteorological factors, and meteorological factors as changes. On the basis of the correlation analysis of meteorological factors,the fuel moisture model could predict the humidity changes in an hour.%可燃物是森林燃烧的物质基础,可燃物的湿度变化一定程度上决定着火灾的形成,所以可燃物湿度模型对研究可燃物湿度变化有很大的帮助,通过建立可燃物湿度模型,来研究可燃物湿度的变化情况.在研究中充分考虑了气象因子对可燃物湿度的时滞情况,研究结果表明可燃物湿度受到气象因子的影响,并随着气象因子的变化而变化.在对气象因子进行相关性分析的基础上,在考虑气象因子的影响的情况下可燃物湿度模型基本可以预测1 h后可燃物湿度的变化情况.
摘要:With the development of differential dynamics, as an important tool of studying practical issues, differential dynamics has already penetrated into all fields, especially the field of biochemistry. A class of biochemical reaction model was studied by the qualitative theory of differential equations, the classification of singular points and the existence and nonexistence of the limit cycles around the singular points about the sufficient conditions were given. And the differential dynamic system qualitative analysis was improved.%随着微分动力学的发展,其作为一种研究实际问题的一种重要工具,已经渗透到各个领域,特别是生物化学领域.应用微分方程定性理论研究一类生化反应模型,对奇点进行了分类,给出了奇点周围极限环的不存在性存在性的充分条件.完善了此类微分动力系统的定性分析.
摘要:To demonstrate theoretical feasibility of pile foundation as one mean to reinforce fairy castle hydropower station. It is necessary to calculate pile foundation bearing capacity. Establish finite element models with ANSYS as an example to analyze three water levels and three pile lengths to 3# river sluice. The results reveled that the change rule of the settlements and stresses under the three water levels were similar. Settlements and stresses under check flood level were the largest of all, the second was normal storage level and the smallest was design flood level. Settlements under nature foundation were larger than the standard ones. Besides, vertical stresses on soleplate were larger than the nature foundation' s. Therefore it is quite necessary to reinforcement the nature foundation. Based on project,this paper carried on deep research on the settlements and stresses caused by large and deep o-verburden layer and obtained some valuable achievements, which could provide some advices for other similar projects.%为了论证桩基作为仙女堡水电站地基加固手段的理论的可行性,有必要计算桩基础承载力.以3#控河闸为例采用ANSYS建立了有限元模型,将三种水位与三种桩长组合成3种工况.计算结果表明三种水位工况下的变位及应力变化规律一致,且校核工况下变位及应力水平最高,其次为正常蓄水位,最次之为设计洪水位.天然工况下的地基沉降均超出了规范允许值,闸底板下游右侧铅直应力超过地基承载力,从理论上得出地基加固必要性.根据工程实际,对深厚覆盖层引起闸室的沉降、应力进行深入的研究,分析资料详细,可为类似工程提供借鉴经验.
摘要:提出一种新型的物料水分测量传感器——缝隙阵分裂式圆柱谐振腔.对带缝隙阵的分裂式圆柱谐振腔进行了大量分析与研究,验证了缝隙阵分列式圆柱谐振腔的可行性.通过对缝隙阵分裂式圆柱谐振腔和非缝隙阵分裂式圆柱谐振腔的比较分析,证明缝隙阵结构可使整个谐振腔的磁场分布得更均匀,可以避免因为物料局部水分不均而产生误报,从而使得利用缝隙阵分裂式圆柱谐振腔测量测物料水分的测量值更准确.而且缝隙阵分裂式圆柱谐振腔的驻波比更好,功率损耗更小,节约能源;缝隙阵结构能保证谐振腔谐振在TE011模式,确保测量更精确.%This paper presented a new sensor for material moisture measurement — the split cylinder resonator with slot array. The resonator with slot array was simulated and analyzed; also the feasibility was verified. The advantages of the new structure were evaluated by comparing between resonator with slot array and no — slot. It could be seen that the magnetic field distribution of the resonator with slot array was more uniform than that of resonator with no - slot resonator, avoiding errors caused by the material' s local uneven moisture, making moisture measurement value more accurate than other sensors. With the slot array, VSWR of the split cylinder resonator became better, the transmission loss got smaller and the power was reduced. Slot array structure ensured the cavity resonant work in the situation of the TE011 mode to get a more accurate measurement value.
摘要:The advanced treatment efficiency of petrochemical wastewater by combined catalysis of microwave and granular activated carbon ( GAC) was investigated in this paper. According to single factor experiments, the COD removal rate of petrochemical wastewater can get above 70% when GAC dosage, microwave radiation time and microwave radiation power were determined reasonably. At the same time, it was found that pH value has little impact on COD removal efficiency. Through orthogonal tests, the sequence of impact on COD removal efficiency of factors was that microwave radiation time > activated dosage > microwave radiation power. In order to make effluent wastewater COD below 50 mg/L, the optimum program of this treatment process regarding the economic and technical conditions was that activated carbon dosage of 6g per 100ml wastewater, microwave radiation power of 700W, microwave radiation time of 6 min and no adjustment of pH value.%对微波/活性炭组合催化用于石化废水的深度处理效果进行了研究.通过单因素实验分析,合理选取活性炭用量、微波辐射时间、微波辐射功率可使废水COD的去除率达到70%以上,同时也表明,水样pH值对组合处理过程中COD去除效果影响不大.根据正交试验实验结果表明,各因素对COD去除率影响的作用大小为:微波辐射时间>活性炭用量>微波辐射功率.为使废水处理后COD低于50 mg/L综合考虑经济与技术条件,确定最佳组合方案为:活性炭用量为6 g(每100 mL水样),微波辐射功率为700 W,微波辐射时间为6 min,水样pH值保持原始数值.
摘要:The content and speciation of 8 heavy metals in surface sediments from the 6 rivers located in upper Three Gorges, southwest China, were investigated. Furthermore, the risks of heavy metals were discussed. With the 8 metal levels all close to their background values in soil environment in upper rivers of Three Gorges, the light pollutions were occurred in these rivers. Among of the 8 metals, Cd, Cu and Hg were to some extent accumulated in these riverine sediments. These 8 metals distributed with different speciation in riverine sediments. The percent of the form of available speciation was found largest in Cd in sediments, followed by Zn, Ni and Cr. The percentages for strong, moderate and light ecological risks were calculated to 5% , 37% and 58% , respectively, suggest a safe status for heavy metals in this zone.%调查了三峡上游长江干流、长江一级支流岷江、沱江和嘉陵江、二级支流渠江和涪江河流表层沉积物中8种重金属的质量比及其不同形态组成,并探讨了沉积物重金属污染的生态风险.研究结果表明,沉积物中8种重金属质量比与三峡上游区域土壤背景值相近,污染程度较轻,其中Cd、Cu和Hg有一定程度污染.沉积物中不同重金属形态分布迥异,Cd的生物可利用态质量比最高,其次为Zn、Ni和Cr.三峡上游区域内重金属污染为强度、中度和轻度生态危害水平的区域分别占5%、37%和58%,表明内河流沉积物中其他重金属的污染程度不高,处于较安全的状态.
摘要:With the raw water of low temperature and low turbidity in Harbin Mopanshan Reservoir as the study object, an Al-Ferron timed complex colorimetric method was employed to measure the content of different hydrolytic-polymeric aluminum species in polyaluminium chloride. Lab-scale tests and pilot-scale tests were carried out to investigate the effect of different aluminum hydrolysis-polymerization species on the coagulation of low temperature and low turbidity water. The lab-scale experimental results indicated that, with the increasing of the basicity of PAC, the content of Ala kept decreasing while the Alc increasing. When the content of Ala was high, the floe produced by the coagulation was not easy to sediment. This will increase the turbidity of the water and reduce the pH value, while could effectively remove some macromolecular organic substances. Alb and Alc at high concentration can both enhance the coagulation effect effectively, with less influence on pH. At the same dosage, Alb had a better effect on the removal of organic substances than that of Alc, but Alb was more likely to make generated complex floe stable. The pilot-scale tests results corresponded with the lab-seale tests results.%以磨盘山水库低温低浊水为研究对象,利用Al-Ferron逐时络合比色法测定聚合氯化铝(PAC)中Al的不同水解聚合形态,确定Al形态分布情况;通过烧杯实验和中试试验,考察铝的不同水解聚合形态对低温低浊水混凝效果的影响.烧杯实验结果表明,随着PAC盐基度的增加Ala浓度不断减少,Alc浓度不断增加;Ala浓度高时混凝形成的絮体不易沉降,会增加原水浊度,降低pH值,可以有效去除水中大部分大分子有机物;Alb和A1c浓度高时水处理效果均较好,对pH的影响较小,相同投药量下Alb对有机物的去除效果优于A1c,但Alb更容易使生成的絮体复稳.中试实验结果与烧杯实验结果相符.
摘要:由于物流管理体系的不完善,形成了配送颈瓶,制约了B2C业务的发展.提出了基于现实路网和实时路况信息的情况下,多目标客户服务的动态配送算法,在路网状况不发生变化的时候,该算法能够和普通算法一样求出最优路径,但是随着路网状况变化的加剧,该算法比普通算法能更好地求出最优配送路径,这对我国动态路径优化问题的研究具有重要的借鉴价值.%B2C is hindered by imperfect logistic systems, for which this article proposes an algorithm based upon real - lime traffic information. This paper put forward dynamic distribution algorithm which could reach the same optimal delivery route as other algorithms do when traffic networks were fixed, the proposed algorithm could find better delivery route when traffic networks were changeable. Dynamic distribution algorithm for multi - objective customer service had important reference value for dynamic path optimization problems.
摘要:针对六足机器人非结构化地形稳定步行问题,研究了基于足力分布的位姿调整策略.通过力学分析建立了机器人任意步态模式下的足力分布模型,获得足底受力的平衡关系;采用重心位置调整策略实现了机器人步行过程中的位姿优化,来提高步行稳定性;并且建立了虚拟悬挂模型,采用足力补偿的方法对外界的扰动进行抑制,进一步提高机器人步行的稳定性.通过仿真验证了该调整策略对提高机器人步行稳定裕度的有效性.%This paper proposed a posture control strategy based on force distribution for the purpose of keeping the posture stability of six - legged robot when the robot was walking on irregular terrain. This strategy considered of establishing the force distribution model on any gait patterns to obtain the balance relationship of plantar forces, and adjusted COG (center of gravity) to achieve optimal posture control. Applied force compensation on the basis of a virtual suspension model to achieve disturbance rejection. This strategy could effectively improve the walking stability of robot on irregular terrain. Adams simulations verified the effectiveness of the control strategy to improve the robot walking stability margin.
摘要:Enhanced fingerprint is the key step of the finger identification system, the effect of the enhanced quality plays an important role in the fingerprint identification system. This paper used the method of Sober operator to get the direction figure, and Sober operator was improved. Based on the direction of filter for fingerprint image enhancement, designed a set of filter to realize the enhancement of fingerprint image, and solved the problem of rotating o-verflow successful through the extended filter. The experimental results proved that the method of improving the quality of the fingerprint was quite effective.%指纹增强是指纹识别系统中的关键一步,增强效果的好坏对整个指纹识别系统有着至关重要的作用.采用基于Sobel算子的方法求取方向图,并且对Sobel算子进行了补充和改进.然后基于方向滤波的指纹图像增强方法,设计一组滤波器来实现指纹图像的增强,并且通过滤波器扩展成功解决了旋转溢出问题.实验证明,该方法的对改善指纹质量十分有效.