The Blue Cave in the Vis Archipelago Paradise,Croatia’s First UNESCO Geopark in the Adriatic

The island of Vis in the Adriatic Sea(Croatia)is a central Adriatic island.This is a small island(89.72 km^(2))but it has a large maritime zone(6,601 km^(2))featuring geologically very attractive open-sea islets known for having rich fishing grounds.The Vis Archipelago was officially declared a UNESCO Geopark on April 18th 2019.This was the first area of the Croatian Adriatic to be included in the Global UNESCO Geopark Network.This paper presents the world-known monument of nature in the Adriatic Sea-the Blue Cave,a sea grotto of exceptional beauty on a small islet of Biševo in the Vis Archipelago Geopark.The author links the Blue Cave’s discovery to the beginning of tourism in Dalmatia,and he presents a few interesting commentaries and impressions of the Blue Cave by various visitors,especially in comparison to the more widely known Grotta Azzurra on the island of Capri near Naples(Italy).

Synthesis, Crystal Structure, Thermal Stability and Solid UV-Vis Absorption Spectra of One New Copper(Ⅱ) Coordination Polymer

A new coordination polymer [Cu2(OH)(nbta)(tib)(H2 O)2]n(1, H3 nbta = 5-nitro-1,2,3-benzenetricarboxylic acid, tib = 1-(4 H-1,2,4-triazol-4-yl)-4-(imidazol-1-yl)benzene) constructed from dimeric Cu(Ⅱ) units has been synthesized under hydrothermal conditions and structurally characterized by single-crystal X-ray diffraction analysis. The compound crystallizes in monoclinic system, space group I2/c, with a = 17.8474(9), b = 11.7588(6), c = 21.9221(11) ?, β = 104.419(5)°, V = 4455.7(4) ?3 and Z = 8. Compound 1 is a three-dimensional structure constructed from dimeric Cu(Ⅱ) units and presents a 2-nodal(3,5)-connected net. Moreover, the thermal stability and solid UV-Vis absorption spectra have been investigated.

邓达智：Vis A Face 超越光辉岁月

“中国元素”，这个曾经一度在国际上令名媛淑女、当红明星趋之若鹜的流行元素，怎么一下子在我们自己的土地上失去了踪影?是香港太国际化，还是中国风开始彻底落伍?

Vis/LaFeO_(3)/PDS复合高级氧化体系降解亚甲基蓝的机制

采用超声辅助溶胶-凝胶法制备对可见光(Vis)有良好响应性的LaFeO_(3)晶体,将其与过二硫酸盐(PDS)结合,构建Vis/LaFeO_(3)/PDS复合高级氧化体系,用以降解亚甲基蓝(MB)。结果表明:在PDS浓度为0.5 mmol/L、LaFeO_(3)投加量为0.5 g/L时,Vis/LaFeO_(3)/PDS体系30 min对质量浓度为30 mg/L的MB的去除率可达92.4%;复合体系对pH值有较强的适应性,Vis、LaFeO_(3)、PDS三者复合,通过提高光生电子-空穴对的分离效率,促进Fe(Ⅱ)/Fe(Ⅲ)的氧化还原循环和氧空位向活性氧自由基的转化,提高了空穴(h^(+))、SO^(-)_(4)·、单线态氧(^(1)O_(2))等活性物质的产生效率和氧化活性能力的发挥。Vis/LaFeO_(3)/PDS体系是光催化和过硫酸盐高级氧化技术的高效结合,其协同效应在废水中难降解有机物的治理方面具有较好的应用前景。

新诊断2型糖尿病血清A-FABP及VisFatin水平与胰岛素抵抗的相关性研究

目的分析新诊断2型糖尿病血清A-FABP及Vis Fatin水平与胰岛素抵抗之间的相关性。方法将80例新诊断2型糖尿病患者设为观察组,将80例健康体检者设为对照组。检测两组患者的空腹Vis Fatin、血清A-FABP、FBG、FINs、血脂、Hb A1C等,然后根据这些值计算胰岛素抵抗指数、胰岛β细胞功能指数、胰岛素敏感性。结果观察组患者的血清A-FABP和Vis Fatin分别为(29.8±2.6)和(31.2±9.8),明显高于对照组健康体检者的(18.9±1.8)和(13.8±4.6),组间比较差异显著(P<0.05)。单因素分析结果显示血清A-FABP和Vis Fatin均与体质指数、总胆固醇、空腹血糖以及胰岛素抵抗指数呈正相关,与胰岛β细胞功能指数和胰岛素敏感性呈负相关,且两因子本身也呈正相关。结论血清A-FABP和Vis Fatin两者表达水平升高,可能参与了胰岛素抵抗和2型糖尿病的发生、发展。

VIS与Flash

20世纪90年代以后,互联网技术得到迅猛发展并晋升大众媒体的行列,面对这一有着强大发展势头的媒体,商家企业都争相借助于互联网宣传自身的形象,而VIS作为CIS(企业形象识别系统)的核心组成部分,其自身可塑性很强,从传统的平面设计、影视制作转移到虚拟的网络媒体上形成其独特的风格。而Flash这个软件的与网络浏览器正好是完美的结合,对于展示产品和企业形象具有明显的优越性。

DFT Investigations(Geometry Optimization, UV/Vis, FT-IR, NMR, HOMO-LUMO, FMO, MEP, NBO, Excited States) and the Syntheses of New Pyrimidine Dyes

In the present work, the molecular structures of two new synthesized dyes：（4,6-dimethylpyrimidin-2-ylamino）（5-p-tolylisoxazol-3-yl）methanol（PS-1） and N-（4,6-dimethylpyrimidin-2-yl）-5-phenylisoxazole-3-carboxamide（PS-2）, have been investigated using density functional theory（DFT） in dimethylformamide（DMF） for the first time. The electronic spectra of new dyes in a DMF solvent were carried out by time dependent density functional theory（TD-DFT） method. After quantum-chemical calculations two new dyes for the optoelectronic applications were synthesized. FT-IR spectra of the title compounds are recorded and discussed. NucleusIndependent Chemical Shifts（NICS） calculations have also been carried out for the title compounds. The computed absorption spectral data of the title compounds are in good agreement with the experimental data, thus allowing an assignment of the UV spectra. The HOMO and LUMO molecular orbitals, excitation energies and oscillator strengths for the dyes have also been calculated and presented.

基于VisVSA技术的三维统计公差分析及应用

圆锯作为一种手持式电动工具,终端客户对其切割精度和切割质量提出越来越高的要求。因此在设计、制造和装配过程中,需要对零部件的尺寸和公差进行详细的分析和控制。使用Vis VSA软件建立起了一个圆锯切割精度的数字化公差模型,并采用统计公差的方法对装配过程进行仿真。可以在设计初期预测出偏差的数量和原因,这将有助于提高产品精度,加速研发过程,降低生产成本。

Viséan Fossil Plants from the Jiujialu Formation in Central Guizhou Province: Implications for Age of Bauxite and Palaeoenvironment

Fossil plants from the carbonaceous shale of upper part of the Lower Carboniferous Jiujialu Formation in Lindai bauxite deposit fill a gap regarding the distribution of Early Carboniferous flora in Central Guizhou Province.Here the Lindai plant assemblage is systematically described,and its composition and geological age are discussed.Research demonstrates that 9 species in 6 genera of the fossil plants are discovered in this study,and they belong to lycopsids,sphenopsids and ferns,respectively.Based on the analysis of the floral composition,the geological age of the Lindai plant assemblage belongs to the Early Carboniferous Viséan.The discovery of Lindai plant assemblage not only provides a new fossil evidence to restrict the age of bauxite deposits in Lower Carboniferous Jiujialu Formation of Central Guizhou Province,but also has great significance to further research the palaeoecological setting and floral evolution during the Early Carboniferous.

Interaction of Ca^(2+) and soil humic acid characterized by a joint experimental platform of potentiometric titration, UV–visible spectroscopy, and fluorescence spectroscopy

Rocky desertification has become a major environmental issue in the karst region of southwestern China.Karst rocky desertification was more severe in regions of limestone soil than in adjacent regions of other soils,despite the relatively higher soil organic matter(SOM)content in limestone soil.The underlying mechanism remains ambiguous.We speculated that the geochemical characteristics of limestone soils in the karst region plays an essential role,especially the high calcium content of limestone soil.To test this hypothesis,we collected limestone soil samples from a limestone soil profile in the southwestern China karst region and extracted humic acid(HA)from these limestone soil samples.We investigated the interaction of Ca^(2+)and three HA samples on a joint experimental platform,which consists of an automatic potentiometric titrator,a UV–visible spectrometer,and a Fluorescence spectrometer.HA solutions were titrated by Ca^(2+)and optical spectra of the HA solutions were monitored during the titration experiments.The results indicated that:(1)the interaction of Ca^(2+)and HA is a combined process of adsorption and complexation.Adsorption dominated the overall distribution behavior of Ca^(2+),which could be fit by Langmuir and Freundlich isotherm models.Complexation was distinguished only when the concentration of Ca2+is low;(2)the changes of UV–visible spectroscopy and excitation–emission matrix fluorescencespectroscopy spectra of HA samples when they were binding with Ca^(2+)implied the apparent molecular size and structure of HA became larger and more complex;(3)the combination of Ca^(2+)and HA plays an important role in the SOM preservation of limestone soils but the stability of the Ca–HA association was relatively weak.The present study draws attention to maintaining the relatively higher Ca^(2+)concentration in limestone soils in ecologic restoration attempts in karst regions.

GEOVIS iData空天大数据助力灾害监测

一、引言我国自然灾害种类多、分布广、影响大,每年都会给各地带来巨大的经济损失和人员伤亡,是制约社会和经济可持续发展的重要因素。中科星图股份有限公司(以下简称中科星图)总结多年来在自然灾害监测、预警及专项应急示范应用等方面的研究成果,基于GEOVIS数字地球产品,自主研制了多款防灾减灾产品,进一步提高了我国综合防灾减灾信息服务的完备性、时效性和科学性。

UV- VIS SPECTRA OF POLYANILINE DOPED WITH CAMPHOR SULFONIC ACID IN DIFFERENT ORGANIC SOLVENTS

The doping reaction of polyaniline with camphor sulfonic acid (CSAH) in different organic solvents was studied by UV Vis spectroscopy. The experimental results show that the polaron band of the species was shifted to shorter wavelength when polyaniline was doped with CSAH in N methyl 2 pyrrolidione (NMP) solvent, while the red shift of polaron band was observed when it was in N, N dimethylformamide (DMF). It indicates that the influence of different processing solvents on the doping property of polyaniline is greatly different. N methyl 2 pyrrolidione is a good solvent for polyaniline, polyaniline chain is unfolded in it. The interaction of NMP with CSAH is so strong that the resulting product is apt to dedoping, while the solubility of polyaniline in DMF is relatively low and polyaniline chain is in partly folded state. Thus the doping reaction is kinetically disadvantageous but thermodynamically advantageous.

Coarse-to-Fine Video Instance Segmentation With Factorized Conditional Appearance Flows

We introduce a novel method using a new generative model that automatically learns effective representations of the target and background appearance to detect,segment and track each instance in a video sequence.Differently from current discriminative tracking-by-detection solutions,our proposed hierarchical structural embedding learning can predict more highquality masks with accurate boundary details over spatio-temporal space via the normalizing flows.We formulate the instance inference procedure as a hierarchical spatio-temporal embedded learning across time and space.Given the video clip,our method first coarsely locates pixels belonging to a particular instance with Gaussian distribution and then builds a novel mixing distribution to promote the instance boundary by fusing hierarchical appearance embedding information in a coarse-to-fine manner.For the mixing distribution,we utilize a factorization condition normalized flow fashion to estimate the distribution parameters to improve the segmentation performance.Comprehensive qualitative,quantitative,and ablation experiments are performed on three representative video instance segmentation benchmarks(i.e.,YouTube-VIS19,YouTube-VIS21,and OVIS)and the effectiveness of the proposed method is demonstrated.More impressively,the superior performance of our model on an unsupervised video object segmentation dataset(i.e.,DAVIS19)proves its generalizability.Our algorithm implementations are publicly available at https://github.com/zyqin19/HEVis.

《CorelDraw与VIS设计》校本选修课程建设与有效实施的探究

在普通高中需多样化和特色化发展、学生需全面又个性化发展的背景下,教师可以构建怎样的多元开放课程,如何提高教学效率以满足教学需求,这是普通高中教师亟须思考的问题.笔者从自身开设的校本选修课程实践出发,浅析课程内容设置及有效教学的手段与方法.

IN SITU FTIR AND UV／VIS STUDY OF THE ADSORPTION OF CYTOCHROME C ON GOLO ELECTRODE

The adsorption behaviour has been studied using in situ FTIR and UV/Vis spectroscopy,voltammetry,AC impedance and polential step methods.The results show that cytochrome c can be irreversibly adsorbed on the gold surface in a complete monolayer and the adsorbed layer can mediate the redox reaction of cytochrome c in the solotiorr but not ail adsorbed cytochrome c molecules would play this role.

Optimization, Spectroscopic(FT-IR, Excited States, UV/Vis) Studies, FMO, ELF, LOL, QTAIM and NBO Analyses and Electronic Properties of Two New Pyrimidine Derivatives

In the given research,the molecular structures of two new compounds,4-((E)-3-(dimethylamino)styryl)-6-((E)-4-(dimethylamino)styryl)pyrimidine-2-amine(PM-1)and N-(4-((E)-3-(dimethylamino)styryl)-6-((E)-4-(dimethylamino)styryl)pyrimidine-2-yl)-4,6-dichloro 1,3,5-1,3,5-triazin-2-amine(PM-2),have been studied with the use of density functional theory(DFT/B3LYP/MidiX)in dimethylformamide(DMF)for the first time.The electronic spectra of the new compounds in a DMF solvent were carried out by temporally dependent density functional theory(TD-DFT)method.The computed absorption spectral data of the title compounds are in good agreement with the experimental data,thus allowing an assignment of the UV/Vis spectra.The equilibrium geometry,the HOMO and LUMO molecular orbitals,excitation energies,oscillator strengths and Natural Bond Orbital(NBO)analysis for the molecules have also been calculated and presented.FT-IR spectra of the title molecules are recorded and discussed.The electron location function(ELF),localized orbital locator(LOL)and quantum theory of atoms in molecules(QTAIM)analyses were also carried out.On the basis of polyvinyl alcohol(PVA)and synthesized molecules,polarizer for UV/Vis region of the spectrum has been developed.

The UV-VIS Studies of C_(60) Chemically Modified Polystyrene Film

The opticai properties of C,, chemicaiiy modified poiystyrene(C,, -PS copolymer) and the parent polystyrene (PS) films have been investigated.Addition of bulky C,, moiety, a special functional group, to the polystyrene by anovel organometallic reaction modified considerably the optical property of theparent polystyrene. The lattice periodicity of pure PS film is subject to someperturbation or distortion in varying degrees due to the covalent attachInent of bulkyC,, moiety to the polymer backbone. C,,-PS copolymer possesses a new energy ba-ndstructure with indirect forbidden band when compared with the parent PS.

Simultaneous Raman and reflection UV/Vis absorption spectroelectrochemistry

In the present work,a new combination of Raman and ultraviolet and visible(UV/Vis)absorption spectroelectrochemistry in reflection mode is proposed.The new experimental setup allows obtaining the two kinds of spectroscopic data without interferences concomitantly with the electrochemical information.To the best of our knowledge,it is the first time to report the simultaneous obtention of electrochemical,electronic,and vibrational information in the same experiment.This new combination provides time-resolved information about the processes that are taking place on the electrode/solution interface which has significant implications in different fields of chemistry,such as modification of electrodes,studies of electrocatalytic reaction mechanisms,development of sensors,among others.Two different systems were used to demonstrate the advantages and capabilities of the brand-new technique,namely,the oxidation of potassium ferrocyanide,an out-sphere system that is usually employed in the validation of SEC techniques,and the electrochemical-surface enhanced Raman spectroscopy(EC-SERS)detection of crystal violet by in-situ formation of the silver SERS substrate,where the UV/Vis spectra were used to follow the formation of the SERS substrate,whereas the Raman response of a probe molecule was used to confirm either the formation of a nanostructured surface and to obtain the fingerprint of the molecule with a high time resolution.The brand-new experimental setup has shown to be useful,versatile,robust,compact,and easy to use for future applications.

Online quantitative analysis of soluble solids content in navel oranges using visible-nearinfrared spectroscopy and variable selection methods

Variable selection is applied widely for visible-near infrared(Vis-NIR)spectroscopy analysis of internal quality in fruits.Different spectral variable selection methods were compared for online quantitative analysis of soluble solids content(SSC)in navel oranges.Moving window partial least squares(MW-PLS),Monte Carlo uninformative variables elimination(MC-UVE)and wavelet transform(WT)combined with the MC-UVE method were used to select the spectral variables and develop the calibration models of online analysis of SSC in navel oranges.The performances of these methods were compared for modeling the Vis NIR data sets of navel orange samples.Results show that the WT-MC-UVE methods gave better calibration models with the higher correlation cofficient(r)of 0.89 and lower root mean square error of prediction(RMSEP)of 0.54 at 5 fruits per second.It concluded that Vis NIR spectroscopy coupled with WT-MC-UVE may be a fast and efective tool for online quantitative analysis of SSC in navel oranges.

STUDY ON THE ASSAY QUALITY OF FOOD GRADE GPR BY UV—VIS METHOD

In this paper, the kind of remanent small molecules in unsaturated polyester res(?) (UP resin) , the best extractant and the best suitalbe extractive time for measuring the content of these small molecules were studied using ultraviolet- visible spectrophotometry ( UV-VIS method). According to the principle of additivity lightness absorption for mixid solution, the contents of samll molecules in several kinds of cured UP resin were measured. It is pointed out that the UV-VIS method in the assay quality of food grade GRP products is more suitable to China.