Study on the Optimization of Internal Control and Camera Distortion Parameters Method Based on Matlab

为了提高相机标定结果的准确度,文中就相机内参和畸变参数的优化方法进行了研究。在建立准确的相机成像及标定模型基础上,根据模型参数估计的具体推导步骤,利用最大似然估计法对得到的参数进行结果优化,然后通过修改镜头畸变模型重新计算参数得到最终结果。实验证明,应用文中提出的流程求解相机内参和畸变参数,简单快速、准确度高且实用性强。Study on the optimization method of camera internal and distortion parameters is conducted in order to improve the accuracy of the results for camera calibration. On the basis of camera imaging and calibration model,we optimize the parameters by the method of maximum likelihood following the specific steps,and get the final result by recalculating parameters through the lens distortion model. Experiment results show that application of the proposed process to solve the camera internal and distortion parameters,simple and fast,with high accuracy and strong practicability

厌氧条件在不同Fe( II) 浓度测定方法中必要性的比较研究

厌氧是目前Fe(II)测定方法中常选择的处理方式,但是不可避免会给实验操作带来不便。为了方便、准确地测定铁还原体系中的Fe(II)浓度,对比研究了厌氧条件对草酸—草酸铵和盐酸两种典型浸提方法测定Fe(II)浓度的影响。结果表明:对于草酸—草酸铵浸提法,厌氧条件是必须的,以防止提取液中的Fe(II)被氧化,而且样品浸提1 h 便可用于Fe(II)的测定;然而对于盐酸浸提法,厌氧条件却并不是必须的,对Fe(II)浓度测定基本不产生影响。因此,为简化实验操作或在没有厌氧条件的情况,可利用盐酸浸提法测定铁还原体系中Fe(II)浓度

表面负载聚苯胺纳米线聚合物复合微球的制备及其防腐性能研究

采用分散聚合和\"受限聚合-原位生长\"法分别制备了聚甲基丙烯酸缩水甘油酯(PGMA)微球和PGMA@PANI(聚苯胺)复合微球,通过改变聚乙烯基吡咯烷酮(PVP)含量以及甲基丙烯酸缩水甘油酯(GMA)浓度实现对PGMA微球粒径和分散度的调控。在此基础上,通过改变苯胺(An)/PGMA、CTAB/An的比例、正戊醇的添加来调控PGMA@PANI复合微球的形貌。结果表明,在0.10g/mL GMA、10%(wt,质量分数,下同)PVP、50%十六烷基三甲基溴化铵(CTAB)和30%An条件下,可得到均匀负载PANI纳米线的聚合物复合微球。以复合微球为防腐助剂制备环氧型防腐涂料的测试结果显示:PGMA@PANI复合微球的添加量为4.5%时,防腐涂层耐盐雾时间为816h,耐盐水时间为960h,展现了较好的防腐性能和机械性能。福建省科技创新平台(2014H2006,2014I2005);;\n厦门市科技重大专项(3502Z20171002);;\n石墨烯技术研发和产业发展专项项目;;\n福建省科技重大专项(2018HZ0001-1

对价支付影响因素的理论和实证分析

我国上市公司股权分置改革成功与否关系我国证券市场未来的发展。本文根据财务理论,结合国情构建6个研究假设,并以330家实施股权分置改革的上市公司为样本,应用实证研究方法,探讨非流通股东的对价送出率及流通股东的对价送达率的影响因素。研究发现股改工作中所采用的市场化博弈机制可在一定程度上保障对价方案的合理性和两类股东的利益,但仍存在诸如机构投资者未发挥议价能力等问题

STUDY ON ADSORPTION OF A BACILLUS STRAIN TO CADMIUM AND COPPER

从土壤中分离并纯化获得1株芽孢杆菌(Bacillus)。通过该菌菌液对Cd2+和Cu2+的吸附实验,探讨了该菌株对上述2种重金属离子的吸附特性。结果表明:该菌株对2种重金属离子都有较强的吸附能力,但对Cu2+的吸附能力比对Cd2+强;其吸附行为可以用Langmu ir和Freund lich吸附方程描述,但更符合Freund lich吸附方程。与此同时,研究还考察了吸附条件的影响,并获得了最佳的吸附实验条件。A bacteria strain was separated and purified from the soil and identified as Bacillus.In an adsorption experiment,its biosorption characteristics to Cd~(2+) and Cu~(2+) were studied.The strain was shown to have a strong adsorptive capacity to the above two metal ions,with a stronger adsorptive capacity to copper ions than to cadmium ions.Its adsorption behavior could be described by either the Langmuir adsorption equation or the Freundlich adsorption equation,the latter equation being the better.The effect of experimental conditions on adsorption was examined and the optimum experimental conditions were identified

Facile synthesis of a interleaved expanded graphite-embedded sulphur nanocomposite as cathode of Li-S batteries with excellent lithium storage performance

通讯作者地址: Huang, L (通讯作者),Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 2. Xiamen Univ, Sch Energy Res, Xiamen 361005, Peoples R China 3. Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia 电子邮件地址: [email protected]; [email protected] paper reports the facile synthesis of a unique interleaved expanded graphite-embedded sulphur nanocomposite (S-EG) by melt-diffusion strategy. The SEM images of the S-EG materials indicate the nanocomposites consist of nanosheets with a layer-by-layer structure. Electrochemical tests reveal that the nanocomposite with a sulphur content of 60% (0.6S-EG) can deliver the highest discharge capacity of 1210.4 mAh g(-1) at a charge-discharge rate of 280 mA g(-1) in the first cycle, the discharge capacity of the 0.6S-EG remains as high as 957.9 mAh g(-1) after 50 cycles of charge-discharge. Furthermore, at a much higher charge-discharge rate of 28 A g(-1), the 0.6S-EG cathode can still deliver a high reversible capacity of 337.5 mAh g(-1). The high sulphur utilization, excellent rate capability and reduced over-discharge phenomenon of the 0.6S-EG material are exclusively attributed to the particular microstructure and composition of the cathode.NSFC 2093110426 21003102 21021002 20833005 973 program 209CB22010

基于异常识别与有损压缩的无线AP数仓构建方法

针对近年来电气和电子工程师协会（IEEE）802.11所定义的无线网络通信标准的全面普及，设备使用量和物联（IoT）数据激增，网络传输压力大，数据管理难，数据安全风险大等问题，基于多年的WiFi无线访问接入点（AP）管理以及数据仓库实施经验，文章实现了基于异常识别与有损压缩的无线AP数仓的构建。仿真结果表明，通过对无线AP重复性较高数据的异常识别以及有损压缩，能够切实解决网络设备重复和数据量过大导致的分布式数据仓库存储压力大及通信拥堵问题，大大降低了企业构建物联网数据仓库的成本

地膜覆盖对农田 N 2 O 排放影响的研究现状

地膜覆盖通过改善土壤环境，进而影响作物产量和农田土壤 N 2 O 的产生与释放。综述了地膜覆盖对农田 N 2 O 排放影响的研究 现状。针对目前研究中存在的问题提出建议，并对该领域的研究方向进行展望。</p

栽培模式、施氮量对旱作春玉米农田 矿质氮和产量的影响

&nbsp;研究了旱地不同栽培模式(全膜双垄沟和传统种植模式)和施氮量(0、170、200、230 kg&middot;hm －2 )对春玉 米生长期间矿质氮和产量的影响。结果表明:不同处理条件下，硝态氮主要分布在 0 ～40 cm 土层，施氮量越高土壤 中硝态氮的含量也就越高，随土层深度增加硝态氮含量降低;不同栽培模式对土壤中硝态氮的分布有明显影响，全膜 双垄沟模式有助于玉米植株高效吸收利用土壤中的氮素，施氮量为 0、170、200、230 kg&middot;hm －2 处理的吸氮量分别提高 了 89． 3%、51． 1%、66． 6%和 102． 8%，所有处理的吸氮量平均提高 77． 4%，从而减少土壤硝态氮的残留，而传统种植 模式的玉米植株利用土壤氮素效率低，易造成硝态氮残留在土壤中，当遇到强降雨时硝态氮的淋洗现象严重，将硝态 氮迁至作物无法吸收利用的土壤深度，造成资源浪费;而铵态氮在土壤中不易迁移，施氮量、栽培模式及玉米不同生 育时期对铵态氮在土壤剖面中的分布几乎没有影响;玉米的植株吸氮量与玉米产量成正比，施氮处理植株吸氮量与 产量显著高于不施氮处理，但是不同施氮处理间的差异不显著。全膜双垄沟模式下春玉米的最佳施氮量为 200 kg&middot; hm －2 ，而传统种植模式下的最佳施氮量为 170 kg&middot;hm －2 ，且在干旱地区宜采用全膜双垄沟栽培模式种植春玉米。</p

A Study on Chinese Companies' Acquisitions of Sensitive Assets Abroad

近年来中国企业海外并购的步伐不断加快,但不少并购却因无法通过他国的外资并购安全审查而遇阻。本文研究中国企业并购涉及国家安全的敏感性海外资产对并购成败及并购绩效的影响。结果表明,相比地方国企和民企,中央国企更可能到海外并购敏感性资产。相比其他并购,敏感性资产并购的成功概率较低,但市场反应较好,有利于提升股东价值。国企实施敏感性资产并购对股东价值的正面影响显著弱于民企。综上,作者认为企业在实施"走出去"战略时,应注意减少并购的政治风险,实现国家、市场和企业利益多赢的局面。In recent years, the pace of Chinese companies＇ cross-border mergers and acquisitions has been accelerating, but many of them were obstructed by foreign countries＇ security censorship. Using a sample of 543 cross-border mergers and acquisitions made by China＇s listed companies between 2000 and 2014, this paper examines how the acquisition of foreign sensitive assets, which may threat foreign countries＇ national security, affects the likelihood of acquisition completion and peribrmance. We find that central state-owned enterprises are more likely to acquire sensitive assets than private-owned and local state- owned enterprises. Meanwhile, the sensitive acquisitions are less likely to be completed than others. The market reaction of acquisition announcements is significantly greater for sensitive acquisitions than for other acquisitions, suggesting that sensitive acquisitions help increase shareholders＇ wealth. Last but not least, we show that the positive effect of sensitive acquisitions on shareholders＇ wealth is stronger for private-owned enterprises than for state-owned enterprises. Overall, our findings suggest that China＇s companies should re- duce the political risks of cross-border acquisitions and try to achieve a win-win situation for the nation, the market and enterprises while implementing ＂go-out＂ strategy.国家自然科学基金青年项目(71272082、71232005、71402156、71532012)；教育部哲学社会科学研究重大课题攻关项目(15JZD019)；福建省社科规划项目(2014C123)；福建省软科学项目(2013R0094)的资助