Subjects: Materials Science >> Electronic, Optical and Magnetic Materials submitted time 2019-04-30
Abstract： CsKNaLi(Li3SiO4)4:Eu2+ (CKNLLSO:Eu2+) as a new member of oxide-based family with UCr4C4-related type structure was first synthesized successfully. The crystal and band structure of the host compound was characterized and analyzed by aid of Rieveld refinement and density functional theory, respectively. As a result of the highly condensed and rigid anion framework, Eu2+ substituting Cs site gives intense green emission with a narrow full width at half maximum of 55 nm excited by InGaN-based near UV LEDs. The CKNLLSO:Eu2+ phosphor exhibits relatively high thermal stability even though the temperature was raised to 190 ℃. The LED fabricated using the optimized CKNLLSO:4%Eu2+ phosphor demonstrated bight and narrow green light with chromaticity coordinate (0.2320, 0.6016) and correlated color temperature 7314 K, implying its great potential for applications as green components for white LEDs.
Peer Review Status:
Awaiting Review
Subjects: Astronomy >> Astrophysical processes submitted time 2019-04-29 Cooperative journals: 《天文研究与技术》
Abstract：射电望远镜是天文观测与深空探测的重要设备，当前正朝着大口径、高频段方向发展。大型射电望远镜的面形精度是影响接收性能的关键指标。为了厘清各种大型射电望远镜面形精度测量方法的特点，将大型射电望远镜面形精度测量方法分为了四类：经典测量法、激光测量法、摄影测量法和微波全息法；详细阐述了各种面形精度测量方法的原理及应用，并对比分析了各自的优劣势；最后对大型射电望远镜面形精度测量方法的发展趋势进行了论述和展望，为不断探索和创新望远镜面形精度测量方法提供了启发。
Subjects: Astronomy >> Astrophysical processes submitted time 2019-04-29 Cooperative journals: 《天文研究与技术》
Abstract： C超丰贫金属星（CEMP）在老年恒星中的普遍存在使得它成为研究宇宙早期形成和演化的重要对象，具有不同中子俘获元素丰度特征的CEMP有着不同的起源。不同于已经历挖掘过程的巨星，主序拐点星能很好地在其表层大气保留形成初期的物质，从而可以追溯到更早期的恒星形成化学环境。我们通过LAMOST巡天数据选源并利用Subaru/HDS进行后续高分辨率光谱观测了12颗CEMP主序拐点星，其中有10颗星是首次被分析。与已有的CEMP主序拐点星观测样本相比，我们的样本中包含了更高比例的中子俘获元素不超丰CEMP恒星（CEMP-no星），发生在中等程度C超丰区域，为其起源研究提供了重要数据。对其中6颗CEMP-no星测定了Li丰度，尤其是其中3颗极贫金属星样为探讨[Fe/H]<-3.0的CEMP拐点星Li丰度特征提供了重要的新观测数据。新增样本验证了CEMP-no星在[Fe/H]～-3.0附近为Li-正常星，与前人结论一致；而新增的两颗CEMP-s星表现出了中等Li丰度，介于之前的较大Li丰度范围，我们的研究为CEMP-s和CEMP-no的分类提供了辅助约束条件。
Subjects: Psychology >> Medical Psychology submitted time 2019-04-29
Abstract： " The Promoting the Emergence of Advanced Knowledge (PEAK) Relational Training System is the first verbal behavior assessment instrument and treatment protocol that integrates Skinner’s “Verbal Behavior” and Post-Skinnerism analysis of human language and cognition, “Relational Frame Theory”. It aims to address the language and cognitive deficits in children with autism. By the end of 2018, the PEAK system has published four modules: PEAK-Direct Training module (PEAK-DT), PEAK-Generalization module (PEAK-G), PEAK Equivalence module (PEAK-E) and PEAK-Transformation module (PEAK-T). Each of the modules contains a direct pre-assessment, a full 184-itemized skill assessment, and a 184 item curriculum. Based on the previous literature, PEAK-DT has broken the ceiling effect of the VB-MAPP milestone evaluation in patients with ASD, and the entirety PEAK system is prospected to provide a more advanced and comprehensive verbal behavior assessment and training system than VB-MAPP. Since the establishment of the PEAK system in 2014, many published empirical studies indicated that some properties of the PEAK system are: good reliability and validity as an assessment tool, effective treatment for the patients with ASD, and an easily-mastered operation in practice; which makes the PEAK system owning potential application value in the intervention delivered from behavioral analysists as well as autistic parents in the future.
Subjects: Astronomy >> Astrophysical processes submitted time 2019-04-26 Cooperative journals: 《天文研究与技术》
Abstract： 我国近期发射的月球探测器携带了全景相机的科学载荷，负责获取巡视器着陆区的月球表面影像采集的重要任务。全景相机共有两台，采用双目立体成像，实际工作时保持相对位置和姿态关系不变。本文参考了地球测绘、计算机视觉等领域的多个相似案例，使用了一种改进的平差模型。经过实验验证，证明了该模型能够消除不同立体像对间相对位置和姿态的偏差，使平差结果更加可靠，为我国探月任务中月表全景相机影像数据的摄影测量处理提供了帮助和支持。
Subjects: Astronomy >> Astrophysical processes submitted time 2019-04-26 Cooperative journals: 《天文研究与技术》
Abstract： 为了测试用于南极CSTAR（Chinese Small Telescope Array）望远镜的CCD（Charge Coupled Device）控制器视频采样电路的性能并对其进行低温可靠性验证，设计了一款基于FPGA的CCD视频波形发生器，它能产生CCD探测器输出的视频波形。上位机通过USB2.0接口与视频波形发生器进行指令通讯，可以改变波形的幅度、周期、上升沿时间以及叠加的噪声。通过设定不同参数的波形输入到CCD控制器的视频采样电路可以在不同温度下对电路的性能进行充分测试，不仅提高了测试效率而且有效地避免了安装CCD测试造成的风险。测试结果表明CCD控制器的视频采样电路性能满足要求并可以在低至-80℃下稳定工作。
Subjects: Astronomy >> Astrophysical processes submitted time 2019-04-26 Cooperative journals: 《天文研究与技术》
Abstract： 通过收集数据，用标准吸积盘方法，短时标光变法，连续波混响滞后法，微引力透镜法分析了活动星系核吸积盘辐射区半径，并对四种方法进行分析讨论。结果表明:（1）将耀变体和类星体参数比较，发现两子类的中心黑洞质量、光度和吸积盘辐射区半径都没有明显差别。本文选择了高光度源进行研究，因此出现了两子类以上参数无明显区别的情况；（2）短时标光变法得到的吸积盘辐射区半径比和黑洞质量没有明显的相关性；（3）连续波混响滞后法得到的吸积盘辐射区半径比对黑洞质量的依赖性高于标准α盘模型法，对于无法确定中心黑洞质量的源，可以利用连续波混响滞后法得到吸积盘辐射区半径；（4）微引力透镜法得到的吸积盘辐射区半径比和黑洞质量没有明显的相关性，且该方法只适用于存在微引力透镜效应的类星体，（5）这些方法从观测上证明了吸积盘辐射区半径与黑洞质量存在相关性，验证了标准模型成立。为进一步在观测上寻找这四种方法所需要的源提供了理论上的指导。对活动星系核的吸积盘辐射区半径研究有重要意义。
Subjects: Physics >> Condensed Matter: Electronic Structure, Electrical, Magnetic, and Optical Properties submitted time 2019-04-24
Abstract： "
Peer Review Status:Awaiting Review
Subjects: Statistics >> Applied Statistical Mathematics submitted time 2019-04-22
Abstract： Objective: The lifetime difference in adjacent parallel structure components becomes small as the number of components belonging to the same parallel structure increases. To infer the system structure, we must clarify the components that belong to the same parallel structure. Methods: A strengthened change point detection model (SCPDM) for weak mean difference data (WMDD) is established, which usually indicates that, as affected by a large variance, the mean difference in two subsignals for one data sequence becomes nonsignificant. For repeatedly retrievable WMDD, we performed two enhanced operations that doubled the mean difference by using the variance information and analyzed the asymptotic properties of the enhanced data. Then, we proposed an SCPDM based on the asymptotic results.Results: Finally, we compared the SCPDM with two other main change point detection models and verified that the SCPDM is superior to other models using WMDD change point detection by the simulation method.Limitations: This paper also have several limitations. First, we only discussed that are independent with normal distribution and single change point. Second, the reason why the relationship between and has an important influence on the accuracy of change point detection is not discussed in depth. We only defined the ratio boundary of WMDD by experience and simulation. Conclusions: Traditional change point detection models may become insensitive or ineffective for WMDD. We gave some asymptotic analysis and established a enhanced change point detection model (SCPDM) based on the asymptotic results. Compared with the traditional method, SCPDM can effectively detect the change point.
Peer Review Status:Awaiting Review
Subjects: Psychology >> Physiological Psychology submitted time 2019-04-22
Abstract： " Stable memories may re-enter an unstable state when they are retrieved. Upon retrieval, a consolidated memory can be updated, strengthened, weakened, or even erased. This process is known as reconsolidation. Thus, reconsolidation interventions provide an opportunity to modify seemingly stable memories. Studies on the reconsolidation of maladaptive human memory emphasize the role of propranolol and behavioral intervention therapies in fear and episodic memory reconsolidation. Multiple cortical brain regions and neural circuits are involved in the reconsolidation of human fear and episodic memory. These include the amygdala, hippocampus, ventromedial prefrontal cortex (vmPFC), prefrontal cortex (PFC), the amygdale-vmPFC network, and the hippocampus-PFC network. Existing memories can be modified during reconsolidation by various interventions, such as drug treatment, behavioral therapy, or noninvasive brain stimulation. This introduces the possibility of using these strategies to treat memory disorders. However, there is a significant gap between the relevant basic research and the clinical application due to the complexity of pathologic memory formation. Therefore, additional experimental paradigms that more closely resemble clinical situations are required. Furthermore, the precise boundary conditions for reconsolidation disruption should be elucidated in a future study, as this will promote the clinical application of laboratory research.
Subjects: Biology >> Bioengineering submitted time 2019-04-21 Cooperative journals: 《中国生物工程杂志》
Abstract： 6-Hydroxynicotinic acid (6HNA) 3-monooxygenase (NicC) is the key enzyme for nicotinic degradation in Pseudomonas putida KT2440. NicC can catalyze the hydroxylation of pyridine ring to promote the ring cleavage reaction of pyridine ring. The expression level of NicC was enhanced by replace the rare codon in the N-terminal of NicC, and then the His-tagged NicC was purified to homogeneity. The optimal temperature reaction range of NicC is from 30℃ to 40℃, and the optimal reaction pH is 8.0. The Cd 2+ ion could significantly inhibit the activity of NicC. The apparent Km and Vmax values of the purified NicC for 6HNA were 51.8 μM and 14.1U/mg, respectively, and those for NADH were 15.0 μM and 10.79 U/mg, respectively. According to the HPLC and LC-MS analysis, NicC could catalyzes 6HNA to form 2,5-DHP and formic acid, and it could also transform 4-hydroxybenzoic acid to form hydroquinone. Isotope labeling experiments proved that the oxygen atom incorporated into 2,5-DHP is from dioxygen. The study will provide useful information for the microbial degradation of pyridinic compounds.
Subjects: Astronomy >> Astrophysical processes submitted time 2019-04-17 Cooperative journals: 《天文研究与技术》
Abstract： 对新疆天文台(XAO)南山一米大视场天文望远镜（NOWT）观测的历史数据，我们进行细致的数据挖掘，发现了百余颗变源。数据处理pipeline为XAO时域巡天数据处理包，该处理包同时考虑了测光系统内部权重和相关性，并结合快速混合算法编写的。除去已知的变源，我们发现了很多新的变源。对新变源证认的过程中，我们将结果与LAMOST、GCVS、VSX、Gaia DR2等星表进行了交叉。在讨论部分，我们对各星表的使用情况给出了说明。对于新源最后发现绝大部分是食双星，少部分是脉动变星，并有一颗表现相对复杂的变源。
Subjects: Psychology >> Cognitive Psychology submitted time 2019-04-15
Abstract： " It is reported that, one primary way for school children to acquire vocabularies is by deriving word meanings from contexts. The typical deficit of developmental dyslexia is that they have smaller vocabulary size than their chronological age-matched children. One recent study has examined the cognitive processes underlying dyslexic children’s novel word learning during reading by using eye tracking. This is a method that is well established as a means of investigating reading behaviour by measuring when and where the eye fixates on text as written language is processed naturally. It should be noted that all the studies investigating novel word learning measured fixation durations on novel words fixated by dyslexic children with a view to quantifying the time required for those novel words to be successfully identified within the context of a sentence. In the present study we investigated saccadic targeting in relation to novel word learning in dyslexia children. Each novel word was embedded into eight sentences. Each provided a context for readers to form a new lexical representation. Two groups of dyslexic children and age-matched control children’s eye movements were recorded when they read sentences, each including 22 individuals. Given the ongoing lexical processing difficulty influences the basic decision of “where to target” in Chinese reading, the novel word poses substantial processing difficulty, particular for dyslexic children with inefficient lexical processing, we predict that dyslexic children would be less efficient to target the eyes than control children did in novel word learning. Consistent with our prediction, the mean initial landing positions on novel words were further away from the word center for dyslexic than control children, showing that the basic decision of saccadic targeting on novel words was less efficient for dyslexic than control children. Additionally, we categorized 8 exposures to novel words as being two learning stages: Learning stage 1 including exposures 1 to 4; and learning stage 2 including the exposures from 5 to 8. We aimed to examine whether they were able to modulate their saccadic targeting as the accumulated learning of novel words. The results showed that, control children targeted the initial saccades closer to the word centers with increased exposures, while such effect did not occur for dyslexic children. These findings indicate that control children adjusted the initial saccadic targeting based on lexical familiarity information, while dyslexic children did not. On the basis of the findings above, we argue that, dyslexic children may adopt more careful strategy of saccade-target selection given their lower efficiency in word processing, such that they had lower efficiencies in the basic decision of saccadic targeting, as well as the usage of “lexical familiarity information” to modulate the saccadic targeting to novel words. This might account for their low word acquisition efficiency in reading.
Subjects: Psychology >> Applied Psychology Subjects: Psychology >> Management Psychology submitted time 2019-04-15
Abstract： "
Subjects: Psychology >> Statistics in Psychology submitted time 2019-04-15
Abstract： The recent replication crisis in psychology has motivated many researchers to reform the methods they used in research, reporting effect sizes (ES) and their confidence intervals (CIs) becomes a new standard in mainstream journals. However, a practical tutorial for calculating CIs is still lacking. In this primer, we introduced theoretical basis of CIs of the two most widely-used effect size, Cohen's d and η2, in plain language. The CIs of both Cohen's d and η2 are calculated under the condition that the alternative hypothesis (H1) is true, and both rely on the estimation of non-centrality parameters of non-central distributions by using iterative approximations. More specifically, non-central t-distribution for Cohen's d and non-central F-distribution for η2. Then, we illustrated how to calculate them in R and JASP with real data. This practical primer may help Chinese psychological researchers understand the CIs better and report CIs in their own research. "
Peer Review Status:Awaiting Review
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2019-04-11
Abstract： " [Objective] Finding a scheme and algebra structure of general quantum teleportation. [Methods] Inductive reasoning and deductive reasoning. The equivalence between polynomial multiplication and tensor product. [Results] Many-body or multi-degrees of freedom cases are generalized in multiple particles system with higher degrees of freedom, even mixed states. [Limitations]It is not valid about continues quantum states. [Conclusions] Predicting the existence of quantum teleportation of multiple particles system with higher degrees of freedom. And special cases which is proven by experiment are included. "
Peer Review Status:Awaiting Review
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2019-04-11
Abstract： [Objective] Finding necessary and sufficient conditions of separability of a pure quantum state or a higher-order tensors . [Methods] Analogic reasoning and inductive reasoning. Starting with necessary and sufficient condition of separability of multivariable functions, proving the general by properties of matrices’ cofactors. [Results] The theorm and its severl equivalent forms will be proved. [Limitations]Not valid in mixed states cases. [Conclusions] Necessary and sufficient conditions of a pure state is entangle state. " "
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Geochemistry submitted time 2019-04-10
Abstract： " In the past two decades, Global Navigation Satellite System-Reflectometry (GNSS-R) has emerged as a new remote sensing technique for soil moisture monitoring. Some experiments showed that the antenna of V polarization is more favorable to receive the reflected signals, and the interference pattern technique (IPT) was used for soil moisture and other geophysical parameters retrieval. Meanwhile, the lower satellite elevation angles are most impacted by the multipath. However, electromagnetic theoretical properties are not clear for GNSS-R soil moisture retrieval. In this paper, the Advanced Integral Equation Model (AIEM) is employed using the wave synthesis technique to simulate different polarimetric scattering at the specular directions. Results show when the incidence angles are larger than 70º, scattering at RR polarization (The transmitted signal is Right Hand Circular Polarization (RHCP), while the received one is also RHCP) is larger than that one at LR polarization (The transmitted signal is RHCP, while the received one is Left Hand Circular Polarization (LHCP)), while scattering at LR polarization is larger than that at RR polarization for the other incident angles（1º~70º）. There is an apparent dip for VV and VR scattering due to the Brewster angle, which will result in the notch in the final receiving power and this phenomenon can be used for soil moisture retrieval or vegetation corrections. The volumetric soil moisture (vms) effects on their scattering are also presented. The larger soil moisture will result in lower scattering at RR polarization, and this is very different from the scattering of the other polarizations. It is interesting to note that the surface correlation function only affects the amplitudes of the scattering coefficients at much less level, but it has no effects on the angular trends of RR and LR polarizations.
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Geodestics submitted time 2019-04-10
Abstract： " GNSS-R is a new promising remote sensing technique, which utilizes the reflected signals of GNSS constellation to remotely sense the ocean or land surface. At present, most of the existing research are based on the experimental observations, few theoretical studies have been carried out. This paper has developed a fully polarization GNSS-R delay Doppler map for land geophysical parameters study. This theoretical model was based on the ocean surface GPS scattering model, after the modifications, it has been used for the land surface. As for the calculations of land geophysical parameters (bare soil and vegetation), random surface scattering model and the first order radiation transfer equation model were used. Effects of bare soil and vegetation parameters on the delay Doppler maps were simulated. In order to use the polarization information for backward inversion, our developed theoretical model has the ability of fully polarizations calculations, i.e. RR, LR, HR and VR pol. This theoretical model is a mechanism tool for the data explanation of space borne mission, experimental campaign design, data simulations and the backward inversion algorithm development. "
Peer Review Status:Awaiting Review
Subjects: Mathematics >> Computational Mathematics. submitted time 2019-04-10
Abstract： This paper proposes a novel method named Polyhedron Regression(PR) for Click-Through-Rate prediction, aiming to take the place of Factorization Machines(FM). PR constructs a convex polyhedra with hyperplanes to separate positive samples from negative samples. PR has intuitionistic geometrical interpretations and a Lipschitz continuous surface, converges to global optimum point from arbitrary initial values. Compared with FM, PR has better classification accuracy, interpretability and surface smoothness on the three artificial datasets. With comparable parameters and computation, PR achieves better AUC than FM on Avazu and Criteo datasets.
Peer Review Status:Awaiting Review
Hits
Hits
Downloads
Comment