17 research outputs found

    Design and implementation of Construction Site Management and Monitoring System for Haikou City

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    在建筑工程施工现场,人员、材料、机械等要素共同存在。对于一些施工技术复杂,材料堆放分散的施工场地,需要对现场环境数据和机械设备参数进行定时采集。从而能够较精准的了解作业现场的实时动态,保证工程施工进度正常,工艺流程安全可靠。在以往的技术经验中,传统的监控系统不能实现多点联动监控,在数据传送方面也不够及时,可靠度亟待加强。而本文所研究的基于3G的建筑工程远程监控系统可以在上述问题的解决中,将系统与目前发展较为先进成熟的3G网络与监控技术结合起来,成功地把施工现场监控数据高效、可靠、实时地传送至监控中心,却不必考虑实际距离限制,从而实现了工程现场人材机的统一管理和作业现场环境的远程监控。 基于3...In the construction site, personnel, materials, machinery and other elements exist together. For the complex construction technology, materials stacked scattered construction site and need to collect on-site environmental data and mechanical parameters of the equipment in time. In the experience of previous techniques, the traditional monitoring system can not realize multipoint linkage monitoring...学位:工程硕士院系专业:软件学院_软件工程学号:X201323186

    C3 植物稳定碳同位素组成与盐分的关系

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    :植物在盐生环境中δ13C值的改变可能包含两个成分:一个是盐分对CO2的扩散、传递或光合速率的影响而引起的δ13C值 的改变;另一个是光合途径的转换引起的δ13C值的变化,δ13 C值的大小与诱导发生CAM或C4代谢的程度有关。植物组织的 δ13C值随盐度的变化趋势除了与植物本身固有的耐盐性有关以外,盐度和胁迫时间是影响植物δ13C的重要因素。根据盐生条 件下同位素分馏特点可知,盐生植物与非盐生植物的δ13C随盐度的变化趋势有所不同。对非盐生植物而言,在低盐度和短期 的盐处理下,随盐度的增加和胁迫时间的延长植物的δ13C值增大,这个阶段限制光合作用的主要因素是气孔导度;但是如果盐 度过低,δ13C变化很小,则难以表现出应有的相关性;随着胁迫的加强,当限制光合作用的非气孔因素成为主导因素时,由于光 合作用受到强烈抑制(光合结构遭到破坏) ,δ13C将随之降低。对盐生植物而言,其δ13C与最适盐度有关。最适盐度下,植物的 δ13C低于其它盐度条件下的δ13C值。盐生条件下,有些C3植物可能发生光合途径的转换,无论诱导发生的是C4代谢还是CAM 代谢,δ13C值均趋于增大。但是,一般情况下,盐处理诱导的光合途径的改变对植物组织整体的δ13 C的影响很小。在密闭环境 中或郁闭林地,植物和土壤呼吸释放的CO2再次参与光合作用,也会改变植物的δ13C值。为了更加全面地考察植物δ13 C与盐 度的关系,需要设置较大的盐度范围和进行长期的胁迫处理,才能够获得相对充分的数据,才有利于全面分析植物δ13 C值与耐 盐性的关系

    秋茄幼苗叶片单宁、可溶性糖和脯氨酸含量对Cd胁迫的响应

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    在温室条件下,采用土壤盆栽技术研究了红树植物秋茄的幼苗在不同浓度的Cd(0~50 mg·kg - 1 ) 胁迫下叶片单宁、可溶性 糖和脯氨酸的含量变化。研究表明:秋茄幼苗叶片中的单宁、可溶性糖和脯氨酸含量均随着Cd 胁迫浓度的增加出现不同程度 先升后降的趋势,这表明秋茄幼苗对低浓度的Cd 有一定的抵抗能力,但在高浓度的Cd 胁迫下则受到伤害;单宁、可溶性糖和脯 氨酸的含量分别在土壤Cd 处理浓度为30mg·kg - 1 、20mg·kg- 1 、40mg·kg- 1 时达到最高,相应地,单宁、可溶性糖和脯氨酸浓度最 高分别达到6612 mg·g- 1 、10510mg·g- 1和12122mg·g- 1 ; Cd 胁迫对脯氨酸含量的影响极显著,因此可以作为秋茄对Cd 污染的检 测指标

    Relationship between salinity and stable carbon isotope composition of C_3 plants

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    植物在盐生环境中δ13C值的改变可能包含两个成分:一个是盐分对CO2的扩散、传递或光合速率的影响而引起的δ13C值的改变;另一个是光合途径的转换引起的δ13C值的变化,δ13C值的大小与诱导发生CAM或C4代谢的程度有关。植物组织的δ13C值随盐度的变化趋势除了与植物本身固有的耐盐性有关以外,盐度和胁迫时间是影响植物δ13C的重要因素。根据盐生条件下同位素分馏特点可知,盐生植物与非盐生植物的δ13C随盐度的变化趋势有所不同。对非盐生植物而言,在低盐度和短期的盐处理下,随盐度的增加和胁迫时间的延长植物的δ13C值增大,这个阶段限制光合作用的主要因素是气孔导度;但是如果盐度过低,δ13C变化很小,则难以表现出应有的相关性;随着胁迫的加强,当限制光合作用的非气孔因素成为主导因素时,由于光合作用受到强烈抑制(光合结构遭到破坏),δ13C将随之降低。对盐生植物而言,其δ13C与最适盐度有关。最适盐度下,植物的δ13C低于其它盐度条件下的δ13C值。盐生条件下,有些C3植物可能发生光合途径的转换,无论诱导发生的是C4代谢还是CAM代谢,δ13C值均趋于增大。但是,一般情况下,盐处理诱导的光合途径的改变对植物组织整体的δ13C的影响很小。在密闭环境中或郁闭林地,植物和土壤呼吸释放的CO2再次参与光合作用,也会改变植物的δ13C值。为了更加全面地考察植物δ13C与盐度的关系,需要设置较大的盐度范围和进行长期的胁迫处理,才能够获得相对充分的数据,才有利于全面分析植物δ13C值与耐盐性的关系。There are two components of variation in carbon isotope composition(expressed as the ratio of stable carbon isotope relative to PDB,denoted δ13C)of plant tissues under salinity conditions:one is the effect of physiological processes;the other is the high salinity-induced switch from C3-photosynthesis to Crassulacean acid metabolism or C4-photosynthesis.The former is a main factor affecting plant δ13C values,whereas the later generally has no significant effect on whole tissue δ13C.The relationship between δ13C and salinity is relevant to intrinsic salt-tolerance,salinity level and the period when plants grow under saline conditions.Non-halophyte and halophytes have different response patterns in δ13C to salinity in terms of the mechanism of carbon isotope discrimination.For non-halophytes,δ13C values will increase with increasing salinity when the stomatal closure is the major factor in restricting photosynthesis.As non-stomatal limitation becomes the key factor with the stress intensified,however,the values of plant δ13C may decline.It should be noted that the correlationship between δ13C and salinity is not exhibited by mild stress treatment.For halophytes,the lowest δ13C occurs at a favourable salinity,and the values increase when the salinity is lower or higher than the optimum level.In dense woodlands,the CO2 derived from respiration recaptured by leaves using photosynthesis may alter their plant's δ13C due to the different δ13C from that of the air.So,further investigations are necessary covering a large range of salinity and duration of treatment,to explore the response of plant δ13C to salinity,and the salt-tolerance of species.国家自然科学基金资助项目(3047030130530150、40673064、30710103908);; 福建省高校创新团队培育计划资助项目~

    Investigation on The Circadian Action Factor of RGB White LEDs

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    采用司辰节律因子模型,通过计算三基色白光LED光源在不同工作电流下的司辰节律因子,对可调色温的三基色白光LED光源进行非视觉效应研究。为了获取与自然光非视觉效应类似的LED白光,建立了司辰节律因子和相关色温分别相对于工作电流的关系模型,从而已知自然光的司辰节律因子和相关色温,就可以确定三基色LED的工作电流。通过测试一天内不同时刻的自然光光谱,根据上述模型推算出了三基色LED的工作电流。在所推算的三基色电流下,测试了白光LED光谱参数并计算了相应的司辰节律因子。与自然光司辰节律因子的对比结果表明,理论值和实验值的误差在1.1%以内,证实该方法具有可行性。本文所呈现的方法对于利用三基色白光LED模拟自然光具有一定的指导意义。The circadian action factor( CAF) model was adopted to study the non-visual biological effects for the three-primary color-tunable white LEDs by calculating CAFs at various driving currents. In order to obtain the white light similar to the natural light according to non-visual biological effects,the models of CAF versus current and CCT versus current were generated. Therefore,the driving currents of three-primary LEDs could be determined after the CAF and the CCT of the natural light were known. Based on aforementioned models,and after the natural light at different times in a day was tested,the driving currents of three-primary LEDs were deduced. Then,driven by these currents,white LEDs were tested and their CAFs were calculated. A comparison between calculated values and experimental counterparts shows that the difference lies within 1. 1%,suggesting the feasibility of this approach. This work appears meaningful for mimicking the natural light by using three-primary white LEDs.科技部国际合作项目(2015DFG62190);; 国家自然科学基金(61504112);; 福建省产学合作重大专项(2013H6024);; 福建省自然科学基金(2016R0091);; 科技部港澳台科技合作专项(2015DFT10120)资助项

    海峡西岸经济区对台科技交流与合作现况——厦门与台湾科技交流与合作的地位、优势及进展

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    厦门与台湾一直有地缘、人文的紧密联系,随着海峡西岸经济区建设的逐渐推进,厦门的经济、科技实力都呈现出加快发展的势头,厦门与台湾科技交流与合作也取得新进展,成为海峡两岸科技交流的重要组成部分。如何发挥厦门在对台科技交流

    Application of a new type of mesh density basket in cleaning and disinfection of small dental equipment (新型密纹篮筐在牙科小器械清洗消毒中的应用)

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    Objective To investigate the application value of a new type of mesh density basket in cleaning and disinfection of small dental equipment. Methods Totally 120 root canal files were randomly divided into the observation group and control group, with 120 files in each group. The stainless steel mesh cup was used in cleaning and disinfection of small dental equipment in the control group, while a new type of mesh density basket was used in the observation group. The quality of cleaning was measured, and the sharp instrument injuries were retrospectively analyzed within 1 year. Results The rate of qualified cleaning was 98. 33%(59/60) in the observation group, which was higher than 85. 00%(51/60) in the control group(P<0. 01). In terms of structural performance of small dental equipment after cleaning, a good performance rate of 100 percent was achieved in the observation group, higher than 80. 00%(48/60) in the control group. The occurrence of sharp instrument injuries has dropped form 26 times to 8 time with 1 year after use of new type of mesh density basket. Conclusion The new type of mesh density basket is effective to improve the quality of cleaning small dental equipment, and reduce the risk of injuries caused by sharp instruments. (目的 探讨新型密纹篮筐在牙科小器械清洗中的应用效果。方法 选取120支待清洗消毒的口腔根管锉随机分为观察组和对照组, 各60支。对照组采用不锈钢网状杯装载清洗, 观察组采用新型双层密纹篮筐装载清洗。评估两组清洗质量, 分析新型双层密纹篮筐使用前后1年内锐器伤发生情况。结果 观察组器械清洗合格率为98. 33%(59/60), 高于对照组的85. 00%(51/60), 差异有统计学意义(P<0. 01)。观察组器械清洗后结构性能均完好, 对照组器功能完好率80. 00%(48/60)。新型密纹篮筐使用前1年内科室发生锐器伤26人次, 使用后的1年内仅发生锐器伤8人次, 有效降低了锐器伤发生风险。结论 新型密纹篮筐装载牙科小器械可有效提高器械清洗质量, 降低工作人员锐器伤发生风险。

    徽水河宽鳍鱲的年龄、生长和繁殖

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    认识鱼类的生活史特征及其对生态环境变化的响应,是鱼类物种保护与资源合理利用的基础。于2009年5月至2010年4月研究了黄山地区徽水河中宽鳍鱲(Zacco platypus)的年龄、生长和繁殖。共采集标本352尾,雌雄性比为0.49∶1,与1∶1差异显著。以鳞片为年龄鉴定材料,雌、雄个体的最大寿命均为3龄;年轮主要形成于3月份。全长和体重呈幂函数关系,两性间无显著性差异,关系式表达为W=6×10–6L3.10;全长和鳞径呈线性关系,且两性间差异显著,关系式分别表达为L♀=29.58R+38.84和L♂=33.17R+34.99;2龄个体的退算全长在雌、雄两性间无显著性差异。繁殖时间为4—7月份;2龄时达50%初次性成熟,其个体全长为98.22(雌)和105.69 mm(雄);绝对繁殖力为(758±362)卵粒,相对繁殖力为(77.38±22.15)卵粒/g。同已有的少量研究资料相比较,徽水河宽鳍鱲的年龄结构较北京地区种群的相对简单,个体生长较同为黄山地区的浦溪河种群相对快速,这种生活史特征差异可能是生态环境空间异质性的作用结果,但有关宽鳍鱲各生活史特征之间的权衡及其对生态环境的响应还有待于进一步研究
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