217 research outputs found
Design and Amelioration for a Marketing Stimulation Platform
营销学是一门研究如何把产品变为商品的学问,近几十年来,随着科学技术的进步,生产力的提高,造成生产能力的严重过剩。如何用市场营销观念来指导企业的生产和经营,提高质量,降低成本就显得越来越重要。在这样的环境下,越来越多的学校成立了专门的市场营销科系或者专业,但是相应的教学手段、实验环境、教学科研的工具却有待加强和丰富。存在理论与实践难以结合,学生所学知识仅限于书本,缺乏实际操作经验的问题。 国外绝大多数的营销相关课程在教授过程中都使用了配套的营销模拟教学软件、在学生毕业设计的时候都可以利用专业的市场营销调查和分析软件包作为工具。作为本人所在高职高专院校,其学生教育更应面向实际应用和实践能力的培养...Marketing is an ology which is to investigate how to convert products into commodity. In the recent half century, along with the advancement of technology and the improvement of productivity, the produce capability is extremely surplus. How to utilize the Marketing concept to instruct the production and management of the enterprises to improve the quality and lower the cost is more and more import...学位:工程硕士院系专业:信息科学与技术学院自动化系_控制工程学号:X20033102
Photosynthetic capacity of three common species of macroalgae and the application in coral aquarium
利用水下饱和脉冲调制叶绿素荧光仪(dIVIng-PAM)测定了珊瑚养殖水处理中3种常见大型海藻石莼(ulVA lACTuCA)、条浒苔(EnTErOMOrPHA ClATHrATA)和羽状蕨藻(CAulErPA MEXICAnA)光能转化效率(fV/fM),快速光曲线(rlC)相关参数和非光化学淬灭(nPQ)。结果表明:石莼和条浒苔的fV/fM分别为0.808±0.004和0.816±0.009,显著高于羽状蕨藻。最大相对电子传递速率rETrMAX(17.52±2.92和19.59±4.43μMOl E·M-2·S-1)、半饱和光强Ik(53.41±8.18和59.71±13.52μMOl PHOTOnS·M-2·S-1)也明显高于羽状蕨藻(rETrMAX和Ik分别为13.72±5.41μMOl E·M-2·S-1和32.67±14.06μMOl PHOTOnS·M-2·S-1),表明石莼和条浒苔有着比羽状蕨藻更高的光合能力和对强光的耐受能力,光保护能力更强;羽状蕨藻较高的rlC初始斜率α表明其在弱光下拥有更强的光捕获能力,弱光下光合效率更高;随光照的增强(0~373μMOl PHOTOnS·M-2·S-1),羽状蕨藻nPQ的增幅有限(0~0.2),最大值仅为条浒苔和石莼的38.1%和62.5%,表明这种藻类更容易受到强光的抑制。因此,在珊瑚养殖的水处理中,可以根据不同的光照选择适宜的藻种或藻种组合并根据光梯度进行布局,反之也可以根据藻种来选择合适的光源,以达到最佳的处理效率。This study investigated the difference of photosynthetic capacity in three macroalgae species( Ulva lactuca,Enteromorpha clathrata,and Caulerpa mexicana) commonly used for nutrient removal in coral aquariums.The photochemical efficiency( Fv/Fm),parameters relevant to rapid light curve( RLC) and non-photochemical quenching( NPQ) in the macroalgae were measured by underwater saturation pulse modulated chlorophyll fluorometer( Diving-PAM).The results showed that Fv/Fmwas 0.808 ± 0.004 for U.lactuca and 0.816 ± 0.009 for E.clathrata,which were higher than that for C.mexicana.Higher maximum relative electron transfer rates( rETRmax)( 17.52 ±2.92 and 19.59 ±4.43 μmol e·m- 2·s- 1) and half-starved value of light intensities( Ik)( 53.41 ±8.18 and 59.71 ±13.52 μmol photons·m- 2·s- 1) were observed in U.lactuca and E.clathrata than that in C.mexicana( 13.72 ± 5.41 μmol e·m- 2·s- 1for rETRmaxand 32.67 ± 14.06 μmol photons·m- 2·s- 1for Ik),indicating that U.lactuca and E.clathrata have stronger photosynthetic capacities,photo-protection capacities and tolerance to higher intense light than C.mexicana.A significantly lower RLC initial slope α in C.mexicana implied that this algal species has a higher photosynthetic capacity under weak light condition.With increasing the light intensity( 0- 373 μmol photons·m- 2·s- 1),however,C.mexicana had a limited increase of NPQ( 0- 0.2),the maximum of which was equivalent to 38.1% of that in U.lactuca and 62.5% of that in E.clathrata.These results indicate that the photosynthesis of E.clathrata may be more easily limited by intense light.Our study suggests that the selection of algal species for nutrient removal in a coral aquarium should be adapted to the light intensity.Single species or the combination of different species of macroalgae can be selected according to the illumination of the coral aquarium in order to maximize the efficiency of nutrient removal.国家海洋局第三海洋研究所基本科研业务项目(海三科2011033); 厦门海洋研究开发院共建项目; 海洋公益性行业科研项目(201105012)资
Community of benthic macrofauna on sandy intertidal zone in Chinese Horseshoe Crab Reserve in Pingtan island,China
2015年7月底,在平潭岛中国鲎(Tachypleus; tridentatus)保护区沙质潮间带进行了大型底栖动物调查。结果表明,在山岐澳和坛南湾沙质潮间带未发现鲎的幼体和成体,证实中国鲎在山岐澳和坛; 南湾已经面临濒危的境况。山岐澳潮间带的大型底栖动物物种数、物种多样性指数(H')、均匀度指数(J)和丰度指数(d)均高于坛南湾潮间带的大型底栖动; 物物种数、物种多样性指数、均匀度指数和丰度指数,而山岐澳潮间带的大型底栖动物栖息密度和生物量低于坛南湾潮间带的大型底栖动物栖息密度和生物量。两个; 海湾大型底栖动物群落的差异与肋(虫昌)螺(Umbonium; costatum)分布有关,坛南湾潮间带栖息着高密度的肋虫昌螺,而在山岐澳潮间带肋(虫昌)螺很少。AZTI's海洋生物指数(AMBI)和多变量海; 洋底栖生物指数(M-AMBI)值证实山歧澳和坛南湾沙质潮间带生态环境均属于受轻度扰动状态。山岐澳主要受海水养殖的影响,吊养的生物和浮筒减缓了水动; 力,导致山岐澳潮间带低洼区表层为泥质沉积物。坛南湾是旅游区,潮间带受人为踩踏较多。At the end of July 2015 , the benthic macrofauna were investigated in; sandy intertidal zone in Chinese Horseshoe Crab Reserve in Pingtan; island. The results showed that both the larvae and adult of Chinese; horseshoe crab were not found in sandy intertidal zone in Shanqi bay and; Tannan bay. It was confirmed that Tachypleus tridentatus stayed in an; endangered situation in the two bays. The species number, species; diversity index (H'),evenness index (J) and a-bundance index (d) of; benthic macrofauna in Shanqi bay were all higher than those in Tannan; bay,while the density and biomass of benthic macrofauna in the; intertidal zone of Shanqi bay were lower than those in Tannan bay. The; difference of benthic macrofaunal community between Shanqi bay and; Tannan bay was related to the distribution of Umbonium costatum . The; density of Umbonium costatum was high in Tannan bay,but it was few in; Shanqi bay. The values of AZTI' s Marine Biotic Index ( AMBI) and; Multivariate Marine Benthic Index (M-AMBI) showed that the ecological; and environmental status both in Shanqi bay and Tannan bay were slightly; disturbed. The mariculture was the key factor in Shanqi bay,because the; suspending aquatic organisms and floats retarded hydrodynamic force led; to muddy sediment in lower intertidal zone in Shanqi bay. Tannan bay is; a tourism region, where has more artificial tread than Shanqi bay.海洋公益项目; 国家自然科学基金面上项目; 厦门大学2015年大创资助项
经下腔静脉肝内穿刺介入操作的临床应用
【目的】探讨经下腔静脉(IVC)肝内穿刺介入操作, 包括肝静脉造影、第二肝门重建术(RSHH)和直接肝内门腔
分流术(DIPS)的临床应用。【方法】回顾性分析11 例经IVC 肝内穿刺介入操作, 评价临床疗效。【结果】11 例成功行经IVC
内穿刺操作, ①经IVC 肝内穿刺肝静脉造影及第二肝门重建术:其中7 例行第二肝门重建术, 术后门脉高压症状明显改善5
例, 轻度改善2 例;1 例IVC 阻塞症状轻度改善;4 例消化道出血患者中, 3 例术后8 个月~ 3 年均再无发生, 1 例术后1 个月再
发急性出血;另2 例只行肝静脉造影;②直接肝内门腔分流术:共2 例, 术后门脉高压症状均明显改善, 分别于术后2 年及4 年
内未发生消化道出血。【结论】①经IVC 肝内穿刺肝静脉造影可准确评价肝静脉和门静脉系统血流动力学状况;②经IVC 途
径的第二肝门重建术穿刺安全, 成功率高。重建通道效果明确, 术后狭窄少;③DIPS 优点是穿刺安全简便, 分流效果好。保护
正常肝静脉, 减少胆道损伤, 术后狭窄少
MySQL密码认证算法的FPGA优化实现
My SQL数据库软件被广泛地应用于WEB项目中,因此它的安全性极为重要。本文针对My SQL密码认证算法的FPGA实现以及应用进行研究,利用并行化、流水线架构实现My SQL认证算法。提出一种基于BRAM的SHA-1算法流水线架构并对其流水线级数进行优化,从而实现高性能。同时利用多模块并行,多密码验证算法,以提高硬件运行速度和计算资源的利用效率。通过优化,高性能实现了基于FPGA硬件的My SQL认证算法,单块芯片的口令恢复速度为18亿个口令密码每秒,多个FPGA构成子板的认证速度为72亿/秒,比采用GPU GTX 690平台的速度提高了5倍。本研究项目获得集成电路设计与测试分析福建省高校重点实验室建设资金.厦门市科技局科技专项经费以及2017年厦门大学教学改革研究项目资金的支持
500kV直流断路器快速机械开关典型故障特性及可靠性提升方法研究
直流断路器是构建柔性直流电网不可或缺的关键设备。快速机械开关是直流断路器中承载电流、实现快速分合闸、耐受分闸恢复电压的核心组件,其结构复杂、动作速度快、电气应力严酷、可靠性要求高,因而设计研制难度大,任一环节出现问题均会影响直流断路器乃至柔直电网的安全可靠运行。然而,目前快速机械开关由于存在设计选型不合理、工艺管控不严格、试验考核不完善等问题,导致在实际工程应用中故障率较高。针对已应用于张北柔性直流电网试验示范工程的500 kV直流断路器,分析了直流断路器研制、调试、运行过程中快速机械开关典型故障的特性及原因。在此基础上,围绕快速机械开关典型故障从设计选型、生产制造、试验考核等方面入手,有针对性地提出可靠性提升措施,为500 kV直流断路器快速机械开关设计研制和运维检修提供了指导和依据
雷帕霉素对血管平滑肌细胞增殖影响的实验研究
【目的】观察雷帕霉素(rapamycin)对体外培养的大鼠胸主动脉平滑肌细胞(SMC)增殖的作用。【方法】组织贴块法体外原代培养大鼠胸主动脉平滑肌细胞,取对数生长期细胞(第6-10代)用作实验,MTr法检测不同浓度雷帕霉素对平滑肌细胞增殖的效果,并用RT-PCR法检测其对平滑肌细胞增殖细胞核抗原(proliferating cell nuclear antigen,PCNA)mRNA表达情况的影响。【结果】①MTT法检测显示雷帕霉素呈剂量依赖性抑制体外培养的大鼠平滑肌细胞增殖,各组吸光值似)分别为:对照组0.902±0.106;0.1ng/mL组0.873±0.079;1ng/mL组0.797±0.046;10ng/mL组0.692±0.061;100ng/mL组0.624±0.075。方差分析差异有显著性。F=28.85,P〈0.001;两两比较1ng/mL以上浓度组与对照组间差异均有显著性,不同浓度间差异显著。0.1ng/mL组与对照组相比差异无显著性。②RT-PCR显示雷帕霉素以浓度依赖模式抑制大鼠平滑肌细胞PCNA-mRNA合成。各组校正后光密度值分别为:对照组219.35±7.20;0.1ng/mL组212.39±6.56;1ng/mL组113.15±10.09;10ng/mL组97.17±12.25;100ng/mL组84.38±8.66。方差分析F=195.49,P〈0.001。两两比较与MTT检测相同。【结论】雷帕霉素呈剂量依赖性显著抑制大鼠平滑肌细胞的增殖,1ng/mL时即可明显起效。雷帕霉素有望成为治疗内支架术后再狭窄的理想药物之一
福建省和溪南亚热带雨林下木层植物的滴水叶尖和滴水大小
研究福建省南靖县和溪南亚热带雨林下木层植物滴水叶尖的发育情况以及滴水大小.该森林滴水叶尖发育程度中等,离叶尖端3mm处的叶宽平均为2.37mm,粗叶木的最小,为0.95mm,瓜馥木的最大,为4.95mm.水滴大小平均为0.044g,日本五月茶的最小,平均为0.023g,瓜馥木的最大,平均为0.078g.水滴大小与滴水叶尖宽度存在极显著的正相关(p<0.001),滴水叶尖越发达,下落的水滴越小.滴水叶尖的作用首先是迅速、有效地排除叶面上的积水,此外可能与对土壤类型的适应有一定的关系
锂离子电池三元层状氧化物正极材料失效模式分析
镍钴锰三元层状氧化物(NCM)正极材料由于其优越的综合性能在动力/储能电池系统(ESS)领域得到广泛应用。虽然Ni含量的增加可提高三元材料的比容量及电池的能量密度,但相关电池体系的容量保持率和安全性将会变差。如何有效解决该矛盾是此类NCM电池所面临的关键问题。本文从NCM电池体系循环过程中常见的体相结构破坏和正极-电解液界面组成改变两方面失效现象出发,结合近年来国内外对NCM失效模式研究中所提出的新理论、方法、应用,从机械破坏、结构演变、电化学极化、化学副反应、正负极协同效应等多个角度对NCM材料的衰退机理提出见解,对指导电池用户合理制定充放电协议、缓解电动汽车(EV)里程焦虑乃至材料设计本身均有重要的指导及借鉴意义。国家重点研发计划资助(2018YFB0104400,2018YFB0905400
Evaluation on difference of therapeutic efficacy of Jiawei Xiaoyao Granules and Pills in treatment of emotional disorder during perimenopause based on Greene Climacteric Scale
目的:在前期加味逍遥丸治疗围绝经期情绪障碍具有比较优势的基础上,基于grEEnE量表探讨其颗粒剂和丸剂不同剂型间疗效差异。方法:经筛选后患有情绪障碍的围绝经期女性75例随机等分为A、b、C3组,分别对应采用帕罗西汀、加味逍遥丸和加味逍遥颗粒剂治疗8周。所有患者在治疗前后各进行1次grEEnE及其子因子评定,并在观察期结束时进行TESS评定。结果:grEEnE总分差及其焦虑、抑郁因子分差:3种治疗方法均能改善,且相互间无显著差异;grEEnE性因子和血管因子分差:后二组均优于A组(P<0.01);TESS评分:与A组比较,b、C组均有统计学意义(P<0.01),评分均小于A组,且后二组间无显著差异。结论:加味逍遥的2种剂型间疗效无显著差异,考虑到帕罗西汀的不良反应,治疗该病加味逍遥的2种剂型都值得推荐。Objective: To investigate the difference in therapeutic efficacy between Jiawei Xiaoyao Granules and pills based on the preliminary research of treating emotional disorder during perimenopause with Jiawei Xiaoyao Pills and Greene Climacteric Scale.Methods: 75 female patients with emotional disorder during perimenopause were slected and randomly divided into 3 groups as group A, B and C.Patients in the 3 groups were treated with paroxetine, Jiawei Xiaoyao Pills and Jiawei Xiaoyao Granules respectively for 8 weeks.Greene and Greene factors assessment were carried out in all the patients before and after treatment, and the TESS assessment was carried out at the end of the observation period.Results: The three therapies all could improve the gap in total score of Greene and its factors as anxiety and depressed, and the difference among these three groups was no significant.The factors of Greene and gap in score of vascular factors of group B and C was better than that of group A(P<0.01).The difference in TESS score between group A and group B and C was significant(P<0.01), while the difference between group B and group C was not significant.Conclusion: The difference in curative effect between the two formulations was not significant.Because of the adverse reactions of paroxetine, in the treatment of emotional disorder during perimenopause, the two formulations of Jiawei Xiaoyao Powder were worth to be recommended.国家自然科学青年基金项目(No.81302960)~
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