F^(-)掺杂ZrO_(2)粉体的水热合成及光催化性研究

采用水热合成法以HF为矿化剂制备了具有较高光催化性的F-掺杂ZrO_(2)纳米材料,系统研究F-对ZrO_(2)纳米粉体相组成、形貌、晶体生长及光催化性能的影响。结果表明:F^(-)的引入促进四方相ZrO_(2)向单斜相的相转化。矿化剂HF掺杂浓度的增加,促进单斜相ZrO_(2)初始生长基元晶粒的生长以及二次颗粒的长大。F^(-)在ZrO_(2){001}晶面上的吸附使ZrO_(2)的初始棒状晶粒趋向于沿[001]方向生长,同时也促进棒状晶粒在{001}晶面定向附生形成纺锤状三维颗粒。在60 min的光照条件下,所有F^(-)掺杂的ZrO_(2)粉末对甲基橙的降解效率均可达到80%以上。0.04 F/ZrO_(2)催化剂的光催化性能最高,在60 min内甲基橙的降解率可达91.7%。

Statistical properties of ideal photons in a two-dimensional dye-filled spherical cap cavity

Within the framework of quantum statistical mechanics,we have proposed an exact analytical solution to the problemof Bose-Einstein condensation(BEC)of harmonically trapped two-dimensional(2D)ideal photons.We utilize this analyticalsolution to investigate the statistical properties of ideal photons in a 2D dye-filled spherical cap cavity.The resultsof numerical calculation of the analytical solution agree completely with the foregoing experimental results in the BEC ofharmonically trapped 2D ideal photons.The analytical expressions of the critical temperature and the condensate fractionare derived in the thermodynamic limit.It is found that the 2D critical photon number is larger than the one-dimensional(1D)critical photon number by two orders of magnitude.The spectral radiance of a 2D spherical cap cavity has a sharppeak at the frequency of the cavity cutoff when the photon number exceeds the critical value determined by a temperature.

An Integrated Use of Advanced T2 Statistics and Neural Network and Genetic Algorithm in Monitoring Process Disturbance

Integrated use of statistical process control (SPC) and engineering process control (EPC) has better performance than that by solely using SPC or EPC. But integrated scheme has resulted in the problem of “Window of Opportunity” and autocorrelation. In this paper, advanced T2 statistics model and neural networks scheme are combined to solve the above problems: use T2 statistics technique to solve the problem of autocorrelation;adopt neural networks technique to solve the problem of “Window of Opportunity” and identification of disturbance causes. At the same time, regarding the shortcoming of neural network technique that its algorithm has a low speed of convergence and it is usually plunged into local optimum easily. Genetic algorithm was proposed to train samples in this paper. Results of the simulation ex-periments show that this method can detect the process disturbance quickly and accurately as well as identify the dis-turbance type.

Statistically Convergent Double Sequence Spaces in 2-Normed Spaces Defined by Orlicz Function

The concept of statistical convergence was introduced by Stinhauss [1] in 1951. In this paper, we study con- vergence of double sequence spaces in 2-normed spaces and obtained a criteria for double sequences in 2-normed spaces to be statistically Cauchy sequence in 2-normed spaces.

Statistical Downscaling Retrieval of Land Surface Temperature in an Area with Complex Landforms in the Eastern Qinling Mountains of China Based on Sentinel-2/3 Satellite Data

The study of land surface temperature(LST)is of great significance for ecosystem monitoring and ecological environmental protection in the Qinling Mountains of China.In view of the contradicting spatial and temporal resolutions in extracting LST from satellite remote sensing(RS)data,the areas with complex landforms of the Eastern Qinling Mountains were selected as the research targets to establish the correlation between the normalized difference vegetation index(NDVI)and LST.Detailed information on the surface features and temporal changes in the land surface was provided by Sentinel-2 and Sentinel-3,respectively.Based on the statistically downscaling method,the spatial scale could be decreased from 1000 m to 10 m,and LST with a Sentinel-3 temporal resolution and a 10 m spatial resolution could be retrieved.Comparing the 1 km resolution Sentinel-3 LST with the downscaling results,the 10 m LST downscaling data could accurately reflect the spatial distribution of the thermal characteristics of the original LST image.Moreover,the surface temperature data with a 10 m high spatial resolution had clear texture and obvious geomorphic features that could depict the detailed information of the ground features.The results showed that the average error was 5 K on April 16,2019 and 2.6 K on July 15,2019.The smaller error values indicated the higher vegetation coverage of summer downscaling result with the highest level on July 15.

Eu原子4f^76p_(1/2)ns自电离过程的动力学特性

采用孤立实激发与速度影像技术相结合的方法,研究了Eu原子4f^76p_(1/2)ns(n=7,9)自电离过程的动力学特性,包括弹射电子的角分布和向各离子态衰变的分支比.首先,采用孤立实激发技术将Eu原子分步从基态4f^76s^2经中间态4f^76s6p激发至4f^76sns Rydberg态,并通过第三步跃迁4f^76s^+→4f^76p_(1/2)^+。将其激发至4f^76p_(1/2)ns自电离态.其次,运用速度影像技术对上述自电离过程进行探测,并通过一系列数学变换计算出该过程的弹射电子的能量分布和角向分布本文不仅分析和比较了各个态自电离衰变的分支比和各向异性参数随光子能量的变化规律,还深入讨论了它们与自电离光谱之间的对应关系.最后,依据自电离衰变的分支比,探讨了实现Eu离子粒子数反转的可能性。

基于空间域和频率域傅里叶变换F^2的光纤模式成分分析

针对高功率光纤激光光束质量诊断的需求,提出了双傅里叶变换F^2法来测量光纤模式成分,该方法侧重于对光纤输出激光的空间域和时间域的傅里叶变换谱进行测量,得到群时延图,给出模式在空间频谱域的分布,以及各个模式的功率占比,与己有的S^2方法相比,该方法大大减小了对移动平台的移动精度要求,适合于测量高功率光纤激光器输出光的模式成分.

Eu原子4f^76p_(3/2)ns自电离态的光谱的研究(英文)

采用孤立实激发技术,对铕原子4f^76p_(3/2)ns(n=7,8)自电离态的光谱进行了系统的研究,同时是首次在不同激光偏振组合下进行的研究。首先,用前两束激光分步将铕原子从基态4f^76s^2经中间4f^76s6p态激发至4f^76sns里德堡态,然后再用第三束激光通过离子实4f^76s^+→4f^76p^+_(3/2)的跃迁将其进一步激发至4f^76p_(3/2)7s自电离态或4f^76p_(3/2)8s自电离态。对铕原子4f^76p_(3/2)ns(n=7,8)自电离态复杂的光谱分别给出了详细的解释,从中我们可以获得一些重要的光谱信息,比如自电峰的能级位置和线宽等,同时还可以观察到收敛于不同离子限的自电离系列之间的组态相互作用。最后,通过比较不同激光偏振组合下的自电离光谱,确定了一些自电离态的总角动量的值。

类F^＋2心色心激光器

介绍了类Ｆ２＋心的产生、热光稳定性及激光性能。

Insights into the enhanced structure stability and electrochemical performance of Ti^(4+)/F^(-) co-doped P2-Na_(0.67)Ni_(0.33)Mn_(0.67)O_(2) cathodes for sodium ion batteries at high voltage

P2-Na_(0.67)N_(i0.33)Mn_(0.67)O_(2)is considered as a promising cathode material for sodium-ion battery (SIBs)because of its high capacity and discharge potential.However,its practical use is limited by Na^(+)/vacancy ordering and P2-O2 phase transition.Herein,a Ti^(4+)/F^(-) co-doping strategy is developed to address these issues.The optimal P2-Na_(0.67)Ni_(0.33)Mn_(0.37)Ti_(0.3)O_(1.9)F_(0.1) exhibits much enhanced sodium storage performance in the high voltage range of 2.0–4.4 V,including a cycling stability of 77.2%over 300cycles at a rate of 2 C and a high-rate capability of 87.7 m Ah g^(-1) at 6 C.Moreover,the P2-Na_(0.67)Ni_(0.33)Mn_(0.37)Ti_(0.3)O_(1.9)F_(0.1) delivers reversible capacities of 82.7 and 128.1 m Ah g^(-1) at-10 and 50℃ at a rate of 2 C,respectively.The capacity retentions over 200 cycles at-10℃ is 94.2%,implying more opportunity for practical application.In-situ X-ray diffraction analysis reveals that both P2-O2 phase transitions and Na^(+)/vacancy ordering is suppressed by Ti^(4+)/F^(-) co-doping,which resulting in fast Na^(+) diffusion and stable phase structure.The hard carbon//P2-Na_(0.67)Ni_(0.33)Mn_(0.37)Ti_(0.3)O_(1.9)F_(0.1) full cell exhibits a high energy density of 310.2 Wh kg^(-1) and remarkable cyclability with 82.1%retention after 300 cycles at 1 C in the voltage range of 1.5–4.2 V.These results demonstrate that the co-doping Ti^(4+)/F^(-) is a promising strategy to improve the electrochemical properties of P2-Na_(0.67)Ni_(0.33)Mn_(0.67)O_(2),providing a facile tactic to develop high performance cathode materials for SIBs.

Branching ratio and angular distribution of ejected electrons from Eu 4f^76p_(1/2)nd auto-ionizing states

The branching ratios of ions and the angular distributions of electrons ejected from the Eu 4f^76p_（1/2）nd auto-ionizing states are investigated with the velocity-map-imaging technique.To populate the above auto-ionizing states,the relevant bound Rydberg states have to be detected first.Two new bound Rydberg states are identified in the region between41150 cm^（-1）and 44580 cm^（-1）,from which auto-ionization spectra of the Eu 4f^76p_（1/2）nd states are observed with isolated core excitation method.With all preparations above,the branching ratios from the above auto-ionizing states to different final ionic states and the angular distributions of electrons ejected from these processes are measured systematically.Energy dependence of branching ratios and anisotropy parameters within the auto-ionization spectra are carefully analyzed,followed by a qualitative interpretation.

La@SiO_(2)负载天然沸石对F^(-)的吸附研究

以天然沸石为载体,制备了La@SiO_(2)负载天然沸石材料La@Si-NZ,并用于水中氟离子(F^(-))的吸附,对材料的吸附动力学、等温吸附性能、再生能力和吸附机理进行了探究。结果表明,La@Si-NZ对F-的吸附,符合拟二级动力学模型和Langmuir模型,在298K下,理论最大吸附量为14.2 mg·g^(-1)。动态吸附中,经过5次循环再生后,La@Si-NZ对F-的吸附量降低了10%。

A Statistical Power Comparison of the Kolmogorov-Smirnov Two-Sample Test and the Wald Wolfowitz Test in Terms of Fixed Skewness and Fixed Kurtosis in Large Sample Sizes

In this study, the statistical powers of Kolmogorov-Smimov two-sample （KS-2） and Wald Wolfowitz （WW） tests, non-parametric tests used in testing data from two independent samples, have been compared in terms of fixed skewness and fixed kurtosis by means of Monte Carlo simulation. This comparison has been made when the ratio of variance is two as well as with equal and different sample sizes for large sample volumes. The sample used in the study is： （25, 25）, （25, 50）, （25, 75）, （25, 100）, （50, 25）, （50, 50）, （50, 75）, （50, 100）, （75, 25）, （75, 50）, （75, 75）, （75, 100）, （100, 25）, （100, 50）, （100, 75）, and （100, 100）. According to the results of the study, it has been observed that the statistical power of both tests decreases when the coefficient of kurtosis is held fixed and the coefficient of skewness is reduced while it increases when the coefficient of skewness is held fixed and the coefficient of kurtosis is reduced. When the ratio of skewness is reduced in the case of fixed kurtosis, the WW test is stronger in sample volumes （25, 25）, （25, 50）, （25, 75）, （25, 100）, （50, 75）, and （50, 100） while KS-2 test is stronger in other sample volumes. When the ratio of kurtosis is reduced in the case of fixed skewness, the statistical power of WW test is stronger in volume samples （25, 25）, （25, 75）, （25, 100）, and （75, 25） while KS-2 test is stronger in other sample volumes.

浅析离子色谱法测定生活饮用水中F^(-)、CL^(-)、NO_(3)^(-)和SO_(4)^(2-)影响因素的控制

本文采用离子色谱法同时测定生活饮用水中F^(-)、CL^(-)、NO_(3)^(-)和SO_(4)^(2-)等阴离子含量,通过系列的实验,分析了该方法的线性关系和精密度,探讨了使用该方法同时测定饮用水中F^(-)、CL^(-)、NO_(3)^(-)和SO_(4)^(2-)时有关淋洗液浓度、流速、分离柱等条件对实验的影响。结果表明,在设立的实验条件下,该方法具有简单、快速与准确的特点,应用此方法测定各离子的线性相关系数r≥0.9995,各离子重复测定的相对标准偏差RSD<2%。

社区2型糖尿病患者结核病发病情况及影响因素分析

目的:分析社区2型糖尿病患者结核病发病情况及影响因素,为制定糖尿病与结核病两病共患防治策略提供理论依据。方法:抽取2013年12月至2019年12月间江苏省常熟市、淮安市清江浦区和淮安区3地登记管理并纳入基本公共卫生服务管理的35岁以上的社区2型糖尿病患者20053例为调查对象。利用“结核病信息管理系统”数据,获得2013年12月至2019年12月期间所有新发结核病患者信息,两部分数据进行匹配,获得研究对象中罹患结核病的患者。采用巢式病例对照研究的设计,将研究对象中非结核病患者与结核病患者进行1∶4的倾向性评分匹配,采用多因素logistic回归分析模型分析社区2型糖尿病患者结核病发病相关影响因素。结果:20053例糖尿病患者中新发结核病123例,其中肺外结核4例,累积发病率为613.37/10万(123/20053),年均发病率为102.23/10万(20.5/20053)。其中男性累积发病率为1119.31/10万(88/7862),高于女性累积发病率[287.10/10万(35/12191)],差异有统计学意义(χ^(2)=54.301,P<0.001)。农村户籍患者结核病累积发病率为718.93/10万(83/11545),高于城市户籍患者结核病累积发病率[470.15/10万(40/8508)],差异有统计学意义(χ^(2)=4.973,P=0.026)。多因素logistic回归分析结果显示,体质量指数升高(OR=0.422,95%CI:0.288~0.617)是糖尿病患者结核病发病的保护因素,而糖化血红蛋白升高(OR=2.019,95%CI:1.195~3.410)和血尿素升高(OR=1.727,95%CI:1.121~2.661)是糖尿病患者结核病发病的危险因素。2013—2019年结核病组患者结核病平均发病年限与空腹血糖值升高呈负相关(r=-0.130)。结论:社区2型糖尿病患者结核病累积发病率远高于同期同地区水平。需要重点关注糖化血红蛋白升高和血尿素升高的糖尿病患者,并采取相应的干预措施。

Theoretical calculation of photoionization cross sections of B-like ions:N^(2+),O^(3+) and F^(4+)

There can be found some notable discrepancies with regard to the resonance structures when R-matrix calculations from the Opacity Project and other sources are compared with recent absolute experimental measurements of Bizau et al [Astron. Astrophts. 439 387 （2005）] for B-like ions N^2＋, O^3＋ and F^4＋. We performed close-coupling calculations based on the R-matrix formalism for the photoionizations of ions mentioned above both for the ground states and first excited states in the near threshold regions. The present results are compared with experimental ones given by Bizau et al and earlier theoretical ones. Excellent agreement is obtained between our theoretical results and the experimental photoionization cross sections. The present calculations show a significant improvement over the previous theoretical results.

离子色谱法测定水中F^(-)、Cl^(-)、NO_(3)^(-)、SO_(4)^(2-)的方法验证

本文依据国家标准方法HJ 84-2016,对离子色谱法测定水中F^(-)、Cl^(-)、NO_(3)^(-)、SO_(4)^(2-)开展了方法验证,验证的主要内容包括标准曲线、方法检出限、测定下限、精密度和准确度,并根据标准的适用范围进行实际样品测定。验证结果表明:F^(-)、Cl^(-)、NO_(3)^(-)、SO_(4)^(2-)的标准曲线线性关系、检出限、测定下限、精密度、准确度和实际样品的相对偏差和加标回收率均满足标准方法要求,实验室的技术能力是否能达到该标准方法要求的技术指标水平,该标准方法具有适用性和可操作性。

SOUND SOURCE LOCALIZATION OF DIGITAL HEARING AIDS USING WAVELET BASED MULTIVARIATE STATISTICAL METHOD

The letter proposed a sound source localization method of digital hearing aids using wavelet based multivariate statistics with the Generalized Cross Correlation (GCC) algorithm. Haar wavelet is used to decompose GCC sequences and extract four wavelet characteristics. And then, Hotelling T2 statistical method is used to fuse the four wavelet characteristics. The statistical value is used to judge the number of sound sources and obtain corresponding time delay estimation which is used to localize the position of sound source. The experimental results show that the proposed method has better robustness in an environment with severe noise and reverberation. Meanwhile, the complexity of al-gorithm is moderate, which is available for sound source localization of hearing aids.

Theoretical Studies on the Intermonomer Interaction of F^(-)·(H_(2)O)_(n)(n=1,2)

Five optimized geometries of F-?(H2O)n (n = 1, 2) were obtained with ab initio calculation at the B3LYP/6-311++G** level. The accurate intermonomer interaction energy was calculated using the MP2 electron correlation correction as well as the basis set superposition error correction by the Boys-Bernardi “counterpoise” protocol. Natural bond orbital (NBO) theory was applied to quantify the relative strength of these interactions and account for their effects on the stability, structural and vibrational parameters of Fˉ?(H2O)n (n = 1, 2). It is shown that the charge transferring from the lone pair of F-1 to the σ?OH(…F) antibonding orbital is important. The results indicate the occupancy of σ?OH(…F) is increased (denoted ?σ?OH(…F)) and the σOH(…F) bond is leng- thened (denoted ?ROH(…F)), leading to the red-shift and the red-shift values have linear correlation with both ?σ?OH(…F) and ?ROH(…F).