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Journal articles on the topic 'Ultra Naturals'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Erdogan, Eren, Michael Schmidt, Andreas Goss, Barbara Görres, and Florian Seitz. "Adaptive Modeling of the Global Ionosphere Vertical Total Electron Content." Remote Sensing 12, no. 11 (2020): 1822. http://dx.doi.org/10.3390/rs12111822.

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The Kalman filter (KF) is widely applied in (ultra) rapid and (near) real-time ionosphere modeling to meet the demand on ionosphere products required in many applications extending from navigation and positioning to monitoring space weather events and naturals disasters. The requirement of a prior definition of the stochastic models attached to the measurements and the dynamic models of the KF is a drawback associated with its standard implementation since model uncertainties can exhibit temporal variations or the time span of a given test data set would not be large enough. Adaptive methods c

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2

Hill, Paul Armstrong, and Robert D. Harris. "Clinical Importance and Natural History of Biliary Sludge in Outpatients." Journal of Ultrasound in Medicine 35, no. 3 (2016): 605–10. http://dx.doi.org/10.7863/ultra.15.05026.

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3

Rebarber, Andrei, Cara Dolin, Nathan S. Fox, Chad K. Klauser, Daniel H. Saltzman, and Ashley S. Roman. "Natural History of Vasa Previa Across Gestation Using a Screening Protocol." Journal of Ultrasound in Medicine 33, no. 1 (2014): 141–47. http://dx.doi.org/10.7863/ultra.33.1.141.

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4

Molchanov, V. S., M. A. Efremova, T. Yu Kiseleva, and O. E. Philippova. "Injectable ultra-soft hydrogel with natural nanoclay." Nanosystems: Physics, Chemistry, Mathematics 10, no. 1 (2019): 76–85. http://dx.doi.org/10.17586/2220-8054-2019-10-1-76-85.

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5

Semenov, V. A., V. O. Oskirko, S. V. Rabotkin, K. V. Oskomov, A. A. Solovyev, and S. A. Stepanov. "Natural Oxidation of Ultra-Thin Copper Films." Russian Physics Journal 60, no. 9 (2018): 1559–64. http://dx.doi.org/10.1007/s11182-018-1251-7.

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6

Shen, Jian Yun, and Xi Peng Xu. "Study on Polishing Rock Minerals of Natural Stone." Advanced Materials Research 24-25 (September 2007): 183–88. http://dx.doi.org/10.4028/www.scientific.net/amr.24-25.183.

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In this study, rock minerals of natural stone were finely polished with loose abrasive and ELID technology to study the surface behaviours. After these rock specimens were polished to ultra smooth surfaces, the surface characteristics were observed with microscope and analyzed with surface texture analyzer. It was found that the calcite and fluorite minerals could be polished to high surface quality with fine loose aluminum oxide abrasive. But ultra smooth quartz surface must be finished with superabrasive ELID polishing technology. The weakly acidic coolant might bring chemical damage to calc

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7

Chen, Chaoji, Ying Zhang, Yiju Li, et al. "All-wood, low tortuosity, aqueous, biodegradable supercapacitors with ultra-high capacitance." Energy & Environmental Science 10, no. 2 (2017): 538–45. http://dx.doi.org/10.1039/c6ee03716j.

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8

Lin, Fengcai, Zi Wang, Yanping Shen, et al. "Natural skin-inspired versatile cellulose biomimetic hydrogels." Journal of Materials Chemistry A 7, no. 46 (2019): 26442–55. http://dx.doi.org/10.1039/c9ta10502f.

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A skin-like cellulose biomimetic hydrogel was prepared based on dynamic covalent chemistry, which realized the combination of ultra-stretchability, self-healing, adhesiveness, antibacterial and mechano-stimuli sensitivity within a single structure.

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9

Louzada, Maria Laura da Costa, Ana Paula Bortoletto Martins, Daniela Silva Canella, et al. "Impact of ultra-processed foods on micronutrient content in the Brazilian diet." Revista de Saúde Pública 49 (2015): 1–8. http://dx.doi.org/10.1590/s0034-8910.2015049006211.

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OBJECTIVE To evaluate the impact of consuming ultra-processed foods on the micronutrient content of the Brazilian population’s diet. METHODS This cross-sectional study was performed using data on individual food consumption from a module of the 2008-2009 Brazilian Household Budget Survey. A representative sample of the Brazilian population aged 10 years or over was assessed (n = 32,898). Food consumption data were collected through two 24-hour food records. Linear regression models were used to assess the association between the nutrient content of the diet and the quintiles of ultra-processed

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10

Carmichael, Stephen W. "The Microscopic Structure of Natural Ultra-Black Material." Microscopy Today 28, no. 6 (2020): 8–10. http://dx.doi.org/10.1017/s1551929520001522.

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11

Huang, Jinzi Mac, Joshua Tong, Michael Shelley, and Leif Ristroph. "Ultra-sharp pinnacles sculpted by natural convective dissolution." Proceedings of the National Academy of Sciences 117, no. 38 (2020): 23339–44. http://dx.doi.org/10.1073/pnas.2001524117.

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The evolution of landscapes, landforms, and other natural structures involves highly interactive physical and chemical processes that often lead to intriguing shapes and recurring motifs. Particularly intricate and fine-scale features characterize the so-called karst morphologies formed by mineral dissolution into water. An archetypal form is the tall, slender, and sharply tipped karst pinnacle or rock spire that appears in multitudes in striking landforms called stone forests, but whose formative mechanisms remain unclear due to complex, fluctuating, and incompletely understood developmental

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12

Sudalaimani, K., and M. Shanmugasundaram. "Influence of Ultrafine Natural Steatite Powder on Setting Time and Strength Development of Cement." Advances in Materials Science and Engineering 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/532746.

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This paper deals with the setting time and pozzolanic activity of cement when ultra fine natural steatite powder (UFNSP) is used as replacement for cement. Initial setting time, final setting time, and mortar cube strength were studied, due to the replacement of ultra fine natural steatite powder with cement at 5%, 10%, 15%, 20%, and 25% by mass of cement. The setting time of fresh cement-binder paste and compressive strength of mortar cubes are observed. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were applied to investigate the microstructural behaviour and chemical elemen

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13

Reznik, Sergey Y., and Natalia D. Voinovich. "The photoperiodic response to single nights suggests a rapidly damping oscillator in Trichogramma telengai (Hymenoptera: Trichogrammatidae)." Canadian Entomologist 151, no. 04 (2019): 456–64. http://dx.doi.org/10.4039/tce.2019.31.

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AbstractIt is known that diapause-inducing effect of ultra-long (16–18 hours and longer) nights on insects with a facultative winter diapause is often weaker than that of “natural” long (usually 10–14 hours) nights. The weak diapause-inducing effect of ultra-long nights can be explained, in particular, in the frames of the external coincidence model of photoperiodic time measurement with a circadian oscillator, which damps under ultra-long nights. Based on this model, it can be expected that (1) the first ultra-long night would have the same diapause-inducing effect as natural long night becau

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14

Yang, Z., and X. Chen. "Probabilistic, ultra-sparse, structural representations of natural scene categories." Journal of Vision 12, no. 9 (2012): 803. http://dx.doi.org/10.1167/12.9.803.

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15

Ning, Haibin, Selvum Pillay, Na Lu, Shaik Zainuddin, and Yongzhe Yan. "Natural fiber-reinforced high-density polyethylene composite hybridized with ultra-high molecular weight polyethylene." Journal of Composite Materials 53, no. 15 (2019): 2119–29. http://dx.doi.org/10.1177/0021998318822716.

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A great deal of research and development work has been recently conducted on natural fiber-reinforced polymer matrix composite for its abundancy, low density, excellent damping characteristic, and good mechanical properties. However, the low strength of natural fiber composite has limited its use to only low stress applications. The purpose of this work is to develop a natural fiber hybrid material with both enhanced strength and failure strain using a novel approach and study the effect of the processing temperature on its microstructure and performance. High-strength ultra-high molecular wei

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16

Bu, Fan, Baoyu Gao, Qinyan Yue, Caiyu Liu, Wenyu Wang, and Xue Shen. "The Combination of Coagulation and Adsorption for Controlling Ultra-Filtration Membrane Fouling in Water Treatment." Water 11, no. 1 (2019): 90. http://dx.doi.org/10.3390/w11010090.

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Ultra-filtration technology has been increasingly used in drinking water treatment due to improvements in membrane performance and lowering of costs. However, membrane fouling is the main limitation in the application of ultra-filtration technology. In this study, we investigated the impact of four different pre-treatments: Coagulation, adsorption, coagulation followed by adsorption (C-A), and simultaneous coagulation and adsorption (C+A), on membrane fouling and natural organic matter removal efficiency. The results showed that adsorption process required a large amount of adsorbent and forme

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17

Kishore, Ravi Anant, Brenton Davis, Jake Greathouse, et al. "Energy scavenging from ultra-low temperature gradients." Energy & Environmental Science 12, no. 3 (2019): 1008–18. http://dx.doi.org/10.1039/c8ee03084g.

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18

Suhane, Rupanshu, M. K. Chopra, and V. V.K. Sethi. "Mathematical Modeling of Battery and Ultra Capacitor for Photo Voltaic System." International Journal of Engineering & Technology 7, no. 3.27 (2018): 41. http://dx.doi.org/10.14419/ijet.v7i3.27.17651.

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In this paper the scientific displaying of battery and ultra capacitor is performed for solar photovoltaic system. The expansion of the ultra capacitor bank displays the requirement for a philosophy to upgrade the photovoltaic system to avoid abundance battery stockpiling. This work traces the strategy used to streamline the blend of photovoltaic boards, batteries, and ultra capacitors for a given solar radiation and load profile. Lessening supplies of petroleum derivative, top oil and the natural effect of non-renewable energy sources on the earth has energized a development in manageable ene

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19

Kim, Eui-Jin, Jae-Eung Kim, and Yi-Heng P. Job Zhang. "Ultra-rapid rates of water splitting for biohydrogen gas production through in vitro artificial enzymatic pathways." Energy & Environmental Science 11, no. 8 (2018): 2064–72. http://dx.doi.org/10.1039/c8ee00774h.

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20

BYTSENKO, A. A., and S. A. KTITOROV. "TEMPERATURE INDUCED CASIMIR EFFECT IN KALUZA-KLEIN SUPERSYMMETRIC THEORIES COMPACTIFIED ON TORUS." Modern Physics Letters A 04, no. 27 (1989): 2609–15. http://dx.doi.org/10.1142/s0217732389002914.

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The Casimir effect at finite temperature is studied for the supersymmetric field models and supermembranes in manifolds with topologies M=Rd−N×TN, N=1,…, d−1 and a natural number d≥4. For supersymmetric models infra-red and ultra-violet behavior of the one-loop free energy is regular contrarily to the supermembranes for which regularized free energy has ultra-violet divergences at critical Hagedorn temperature.

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21

Shalyt-Margolin, Alexander. "The Equivalence Principle Applicability Boundaries, Measurability, and UVD in QFT." Nonlinear Phenomena in Complex Systems 24, no. 1 (2021): 38–55. http://dx.doi.org/10.33581/1561-4085-2021-24-1-38-55.

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This paper presents, within the scope of the earlier introduced measurability concept, a study of the ultra-violet behavior quantum field theories. It is demonstrated that in the case of the natural assumptions there are no ultra-violet divergences in these theories. In so doing, the methods of a lattice quantum-field theory are used. Applicability of the obtained results to different energy scales is discussed.

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22

Zhou, Wenjuan, Weijiang Guan, and Chao Lu. "Natural montmorillonite nanosheet colloid-catalyzed hydrogen peroxide ultra-weak chemiluminescence." RSC Advances 4, no. 30 (2014): 15377. http://dx.doi.org/10.1039/c4ra00636d.

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23

Tao, Shengnan, Hang Jiang, Rongjie Wang, Cheng Yang, Yunxing Li, and To Ngai. "Ultra-stable Pickering emulsion stabilized by a natural particle bilayer." Chemical Communications 56, no. 90 (2020): 14011–14. http://dx.doi.org/10.1039/d0cc05690a.

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24

Wang, H., and J. Zhou. "Rietveld refinement of natural fluorapatite from ultra-high pressure eclogite." Acta Crystallographica Section A Foundations of Crystallography 64, a1 (2008): C496. http://dx.doi.org/10.1107/s0108767308084055.

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25

Chen, Shengfu, Zhiqiang Cao, and Shaoyi Jiang. "Ultra-low fouling peptide surfaces derived from natural amino acids." Biomaterials 30, no. 29 (2009): 5892–96. http://dx.doi.org/10.1016/j.biomaterials.2009.07.001.

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26

Hiemstra, Tjisse, and Wei Zhao. "Reactivity of ferrihydrite and ferritin in relation to surface structure, size, and nanoparticle formation studied for phosphate and arsenate." Environmental Science: Nano 3, no. 6 (2016): 1265–79. http://dx.doi.org/10.1039/c6en00061d.

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27

Tisserat, Brent, and Robert Silman. "Growth of Plant Tissue Cultures in Ultra-high Levels of Carbon Dioxide under Autotrophic and Heterotrophic Conditions." HortScience 31, no. 4 (1996): 587e—587. http://dx.doi.org/10.21273/hortsci.31.4.587e.

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A comparative study was undertaken to determine the influence of lighting, carbohydrate concentrations and ultra-high levels of CO2, i.e., >10,000 ppm, on sterile culture growth. Past CO2-sterile studies have confirmed that elevation of CO2 to as high as 1000 ppm resulted in beneficial growth. Within special constructed chambers, tissue cultures were given a variety of CO2 levels for 12–16 hours/day using artificial lighting and natural sunlight. Several different plants (lettuce, beans, pine) and plant culture types were grown in CO2-enriched environments, ranging from 350 to 50,000 ppm. I

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28

Wang, Sheng Peng, Xian Zheng Zhao, Bo Cai, and Shen Hua. "Study of New Ultra-Temperature Polymer Fracturing Fluid Material." Advanced Materials Research 1061-1062 (December 2014): 283–86. http://dx.doi.org/10.4028/www.scientific.net/amr.1061-1062.283.

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Nowadays, hydraulic fracturing has become the mainly treatment in low permeability reservoirs.Niudong buried-hill was located in the Baxian Sag of the Bohai Bay Basin. The charactristers of this natural reservoirs are summarized as :low porosity and ultra-low permeability ;complex storage types and complex fracture break and with ultra high temperature (200-210°C) ,In the past, 150°C fracturing fluid system was used in order to solve fluid fracturing efficiency low, quick acid rock reaction.Field test shown that it can’t meet target of greatly improve the output. So it is necessary to develop

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29

Liu, Yong, Ting Lu, Zhuo Sun, Daniel H. C. Chua, and Likun Pan. "Ultra-thin carbon nanofiber networks derived from bacterial cellulose for capacitive deionization." Journal of Materials Chemistry A 3, no. 16 (2015): 8693–700. http://dx.doi.org/10.1039/c5ta00435g.

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30

Nguyen, Manh B., Xuan Nui Pham, and Huan V. Doan. "Heterostructure of vanadium pentoxide and mesoporous SBA-15 derived from natural halloysite for highly efficient photocatalytic oxidative desulphurisation." RSC Advances 11, no. 50 (2021): 31738–45. http://dx.doi.org/10.1039/d1ra06901b.

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31

Gao, Si Yu, Hui Ding, and Kai Cheng. "An Integrated Approach to the Design and Analysis of an Ultra-High Speed Air-Bearing Spindle." Materials Science Forum 723 (June 2012): 227–32. http://dx.doi.org/10.4028/www.scientific.net/msf.723.227.

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This paper presents an integrated approach to the design and analysis of an ultra-high speed air bearing spindle, by integrating the structural design, performance analysis and system optimization in a virtual design environment. Firstly, the ultra-high speed air bearing spindle is designed, including grooved hybrid air bearing, helical water cooling channel and built-in motor, etc; Subsequently, pneumatic hammer instability and whirl instability of air bearing are studied; The thermal-structural behaviors of the spindle system at ultra-high speeds are investigated by using structural FEA coup

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32

Liu, Xiao Gen, Yi Wang Bao, and De Tian Wan. "Measurement for Elastic Modulus of Ultra-Thin Glass by Cantilever Beam Method." Key Engineering Materials 726 (January 2017): 105–9. http://dx.doi.org/10.4028/www.scientific.net/kem.726.105.

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In order to overcome the limitations of common methods for measuring elastic modulus of the ultra-thin glass，a novel method is proposed for measuring the elastic modulus of the ultra-thin glass by cantilever beam vibration method．The measurement principle，apparatus，and manipulation were introduced. In this method, the measured ultra-thin glass is generated in the form of a cantilever beam, and the cantilever beam can be vibrated for a short time when transient excitation is applied. The natural frequency of the cantilever beam can be used to calculate the elastic modulus of the ultra-thin glas

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33

Jiang, Wenjing, Zhiqiang Chen, Xian Cheng, et al. "A novel ion imprinted SiO2 microsphere for the specific and rapid extraction and pre-concentration of ultra-trace methyl mercury." RSC Advances 6, no. 46 (2016): 40100–40105. http://dx.doi.org/10.1039/c6ra05973b.

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34

Lu, Fang, Yurong Ma, Hui Huang, et al. "Edible and highly biocompatible nanodots from natural plants for the treatment of stress gastric ulcers." Nanoscale 13, no. 14 (2021): 6809–18. http://dx.doi.org/10.1039/d1nr01099a.

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Semi-carbonized nanodots from charred Atractylodes macrocephala are demonstrated in detail for their strong anti-stress gastric ulcer effect with inhibition up to 90% and show extremely high biocompatibility and ultra-low toxicity.

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35

Krishna, D. Sai, N. N. Meeravali, and Sunil Jai Kumar. "Graphene oxide nanosheets in basic medium: a new potential adsorbent for microwave assisted cloud point extraction of beryllium from industrial effluents prior to ICP-OES determination." Analytical Methods 11, no. 18 (2019): 2456–64. http://dx.doi.org/10.1039/c9ay00377k.

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36

Han, Eui-Seok, Junho Gong, Hoseong Jeong, and Dooyong Cho. "Development of Bonded Natural Stone Pavement Using Ultra-Rapid-Hardening Mortar." Applied Sciences 10, no. 10 (2020): 3576. http://dx.doi.org/10.3390/app10103576.

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Bonded natural stone pavement has been typically used in historical neighborhoods to satisfy functional and architectural aesthetic standards. Despite its advantages, it has been barely applied to places for heavy traffic volume or high travelling speed because of various structural failures in joints and bedding courses. Ultra-rapid-hardening mortar for natural stone pavement was considered as an alternative to minimize these failures. The objective of this study is to develop bound stone pavement using the ultra-rapid-hardening mortar for high traffic volume and evaluate throughout by carryi

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37

Cheng, Xiao-wei, Ying Zhong, Jing Wang, Juan Guo, Qiang Huang, and Ying-cai Long. "Studies on modification and structural ultra-stabilization of natural STI zeolite." Microporous and Mesoporous Materials 83, no. 1-3 (2005): 233–43. http://dx.doi.org/10.1016/j.micromeso.2005.04.016.

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38

Sae-Oui, Pongdhorn, Chakrit Sirisinha, and Kannika Hatthapanit. "Properties of Natural Rubber Filled with Ultra Fine Acrylate Rubber Powder." Journal of Elastomers & Plastics 42, no. 2 (2010): 139–50. http://dx.doi.org/10.1177/0095244310362733.

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39

Anhuai, LU, HUANG Shanshan, LIU Rui, ZHAO Dongjun, and QIN Shan. "Environmental Effects of Micro- and Ultra-microchannel Structures of Natural Minerals." Acta Geologica Sinica - English Edition 80, no. 2 (2010): 161–69. http://dx.doi.org/10.1111/j.1755-6724.2006.tb00225.x.

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40

Chen, Zhili, Mitsuru Konno, and Shinichi Goto. "Study on Ultra Lean Premixed CI Engine Fueled with Natural Gas." Proceedings of the JSME annual meeting 2000.4 (2000): 339–40. http://dx.doi.org/10.1299/jsmemecjo.2000.4.0_339.

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41

Wada, Ryota, Tatsuya Kaneko, Masahiko Ozaki, Tomoya Inoue, and Hidetaka Senga. "Longitudinal natural vibration of ultra-long drill string during offshore drilling." Ocean Engineering 156 (May 2018): 1–13. http://dx.doi.org/10.1016/j.oceaneng.2018.02.054.

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42

Rossi, Maurizio, and Davide Brunelli. "Ultra Low Power MOX Sensor Reading for Natural Gas Wireless Monitoring." IEEE Sensors Journal 14, no. 10 (2014): 3433–41. http://dx.doi.org/10.1109/jsen.2014.2339893.

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43

Mayer, Stephan A. "Intracerebral hemorrhage: natural history and rationale of ultra-early hemostatic therapy." Intensive Care Medicine 28 (October 1, 2002): s235—s240. http://dx.doi.org/10.1007/s00134-002-1470-8.

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44

Lyzwa, Jan, and Jochen Zehfuss. "Experimental investigations of ultra-high performance concrete exposed to natural fires." Fire Safety Journal 125 (October 2021): 103399. http://dx.doi.org/10.1016/j.firesaf.2021.103399.

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López-López, José Antonio, Jan Ake Jönsson, Manuel García-Vargas, and Carlos Moreno. "Simple hollow fiber liquid membrane based pre-concentration of silver for atomic absorption spectrometry." Anal. Methods 6, no. 5 (2014): 1462–67. http://dx.doi.org/10.1039/c3ay42024h.

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The presented hollow fiber supported liquid membrane improves and simplifies silver pre-concentration in natural water samples, allowing its determination at an ultra-trace level using standard instrumental techniques such as GFAAS.

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46

Wang, Lu, Shu Liu, Zhong Zheng, Zifeng Pi, Fengrui Song, and Zhiqiang Liu. "Rapid assay for testing superoxide anion radical scavenging activities to natural pigments by ultra-high performance liquid chromatography-diode-array detection method." Analytical Methods 7, no. 4 (2015): 1535–42. http://dx.doi.org/10.1039/c4ay02690j.

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A simple and rapid ultra-high performance liquid chromatography-diode-array detection (UPLC-DAD) method was developed for testing superoxide anion radicals (O<sub>2</sub>˙<sup>−</sup>) scavenging activities to natural pigments.

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47

Huo, Ran. "Refracting into ultra-diffuse galaxy NGC 1052-DF2 by passing near the centre of NGC 1052." Monthly Notices of the Royal Astronomical Society: Letters 495, no. 1 (2020): L144—L148. http://dx.doi.org/10.1093/mnrasl/slaa071.

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ABSTRACT The recent observation of the ultra-diffuse galaxy NGC 1052-DF2 shows a galaxy may lack dark matter, which becomes a challenge to the standard structure formation theory. Here, we show that such phenomena can be a natural consequence if the NGC 1052-DF2 had experienced a single passage within a few kpc to the centre of the galaxy NGC 1052. The tidal effect of NGC 1052 in the encounter will heat the NGC 1052-DF2, and stretch the previous dwarf galaxy significantly into its current size. The relative lack of dark matter in the observed region is a natural consequence of the dark matter

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48

Sanyal, Kaushik, Sankararao Chappa, J. Bahadur, Ashok K. Pandey, and Nand Lal Mishra. "Arsenic quantification and speciation at trace levels in natural water samples by total reflection X-ray fluorescence after pre-concentration with N-methyl-d-glucamine functionalized quartz supports." Journal of Analytical Atomic Spectrometry 35, no. 11 (2020): 2770–78. http://dx.doi.org/10.1039/d0ja00385a.

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49

le Guével, Xavier, Francisca Palomares, Maria J. Torres, Miguel Blanca, Tahia D. Fernandez, and Cristobalina Mayorga. "Nanoparticle size influences the proliferative responses of lymphocyte subpopulations." RSC Advances 5, no. 104 (2015): 85305–9. http://dx.doi.org/10.1039/c5ra16164a.

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Ultra-small particles (<2 nm) lead to high cellular uptake without DC maturation and therefore lymphocyte proliferation whereas 12 nm gold nanoparticles induce cell mediated responses and accompanied by inflammatory natural killer cell stimulation.

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50

Tikoo, Mohan L. "Absolutes of almost realcompactifications." Journal of the Australian Mathematical Society. Series A. Pure Mathematics and Statistics 41, no. 2 (1986): 251–67. http://dx.doi.org/10.1017/s1446788700033668.

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AbstractGiven Hausdorff spaces X and Y and a perfect irreducible and θ-continuous map f from X onto Y, technique that carries open (ultra) filters on X to open (ultra) filters on Y back and forth in a natural way is introduced. It is proved that if f is a perfect irreducible and θ-continuous map from X onto Y, then X is almost realcompact if and only if Y is almost realcompact. Several commutativity relations between the ‘absolutes of almost realcompactifications’ and the ‘almost realcompactifications of absólutes’ of a space X are discussed.

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