5,193 research outputs found
Effect of CaO content in raw material on the mineral composition of ferric-rich sulfoaluminate clinker
No full textFerric-rich calcium sulfoaluminate (FR-CSA) cement is an eco-friendly cement. Fe2O3 exists in different minerals of FR-CSA clinker, e.g., Ca4Al2Fe2O10 (C4AF), Ca2Fe2O5 (C2F), and Ca4Al6-2xFe2xSO16 (C4A3-xFxS-). The mineral composition depends on the chemical composition of the raw materials and significantly determines the reactivity of FR-CSA cement. To optimize the phase composition of the FR-CSA clinker, chemical reagent raw mixtures with different amounts of CaO were used to prepare the FR-CSA clinker. X-ray diffraction (XRD) analysis, Rietveld quantitative phase analysis (RQPA), Fourier Transform Infrared spectroscopy (FT-IR), and scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS) were used to identify the mineralogical conditions of the FR-CSA clinker. The results indicated that the amounts of CaO in raw materials greatly affected the iron-bearing phase formation in the FR-CSA clinker. With decreasing CaO content involved in calcination reaction, the amounts of Fe2O3 incorporated in C4A3-xFxS- increased up to 17.72 wt% (where x = 0.36). The findings make it possible to optimize the mineral composition of the FR-CSA clinker by changing the CaO content in raw materials. Furthermore, low CaO content in the raw material is beneficial to the formation of C4A3-xFxS-, which enables the use of solid wastes containing low calcium for producing FR-CSA cement.Accepted author manuscriptMaterials and Environmen
Shou shi qing bian
No full textV.1-2. 卷一至二. 診家正眼 : [二卷] -- v.2-3. 卷三至四. 本草通玄 : [二卷] -- v.4. 卷五. 病機沙篆 -- v.5. 卷六. 增補病機沙篆 -- v.6. 卷七至八. 壽世正編 : [二卷] / 尤乘纂.V.1-2. juan yi zhi er. Zhen jia zheng yan : [er juan] -- v.2-3. juan san zhi si. Ben cao tong xuan : [er juan] -- v.4. juan wu. Bing ji sha zhuan -- v.5. juan liu. Zeng bu bing ji sha zhuan -- v.6. juan qi zhi ba. Shou shi zheng bian : [er juan] / You Cheng zuan.李中梓著述 ; 尤乘增補.綫裝.框17.6x12.9公分, 10行23字. 黑口, 左右雙邊, 單黑魚尾. 版心中鐫卷次及小題, 下鐫葉次.題名據叢書題名頁 ; 叢書題名頁刻"宏道堂梓"刻書年據序.書中刻字風格不一, 有補板.《壽世正編》分上, 下卷 ; 又題為"壽世青編"《中國中醫古籍總目》(13138)著錄.鈐"莊兆祥印", "莊兆祥".Xian zhuang.Kuang 17.6 x 12.9 gong fen, 10 hang 23 zi. Hei kou, zuo you shuang bian, dan hei yu wei. Ban xin zhong juan juan ci ji xiao ti, xia juan ye ci.Ti ming ju cong shu ti ming ye ; cong shu ti ming ye ke"hong dao tang zi"Ke shu nian ju xu.Shu zhong ke zi feng ge bu yi, you bu ban.Detailed notes in vernacular field only.Detailed notes in vernacular field only.Li Zhongzi zhu shu ; You Cheng zeng bu.Qian "Zhuang Zhaoxiang yin", "Zhuang Zhaoxiang"
Does Gua sha therapy reduce pain intensity in patients with chronic back pain?
No full textOBJECTIVE: The objective of this selective EBM review is to determine “Does Gua shatherapy reduce pain intensity in patients with chronic back pain?”
STUDY DESIGN: A systematic review of three randomized controlled trials/studies published in English between 2013-2019.
DATA SOURCES: All articles were published in peer-reviewed journals and obtained from PubMed. The studies were selected based on their applicability to the topic listed above.
OUTCOMES MEASURED: A common outcome measured across all three articles included pain intensity. Each study used the 100 mm Visual Analog Scale (VAS). Participants were asked to rate their pain before and after therapeutic interventions. A higher score indicates a higher subjective feeling of pain.
RESULTS: Saha et al. demonstrated a stronger decrease in pain intensity after Gua sha therapy compared to a patient’s previous medical regimen. The authors showed a mean change from baseline of 24.5 mm in the Gua sha treatment group compared to the mean change from baseline of 12.3 mm in the control group (p\u3c0.001). Similarly, Wang et al. showed that Gua sha therapy was more effective than acupuncture. This is demonstrated by a mean change from baseline of 59 mm after Gua sha therapy and a mean change from baseline of 49 mm after acupuncture (p=0.001). A conclusion comparing the effectiveness between Gua sha therapy and hot pack therapy could be made based on Yuen et al.’s study. However, the authors demonstrated that Gua sha therapy was effective at decreasing pain intensity as seen by F=30.11, p\u3c0.0001, and post hoc p=0.0003.
CONCLUSIONS: All three studies demonstrated that Gua sha therapy significantly decreased pain intensity in patients with chronic back pain. Additionally, Saha et al. and Wang et al. demonstrated that Gua sha therapy was more effective at decreasing pain intensity compared to their respective control groups. The control groups from all three articles included acupuncture, hot pack therapy, and original medical regimens. Further research is needed to explore treatment duration and long term success of Gua sha therapy
A Sulphide Capacity Prediction Model of CaO-SiO2-MgO-Al2O3 Ironmaking Slags Based on the Ion and Molecule Coexistence Theory
No full textA sulphide capacity prediction model of CaO-SiO2-MgO-Al2O3 ironmaking slags has been developed based on the ion and molecule coexistence theory (IMCT) and verified by two groups of sulphide capacity data of CaO-SiO2-MgO-Al2O3 ironmaking slags by different researchers. A hot metal pretreatment slags of CaO-SiO2-MgO-Al2O3 with high binary basicity is also applied to verify the feasibility of the developed IMCT model. The predicted sulphide capacity of CaO-SiO2-MgO-Al2O3 ironmaking slags at 1773 K as well as high alumina CaO-SiO2-MgO-Al2O3 ironmaking slags in a temperature range of 1773-1873 K by the developed IMCT model has higher accuracy than the measured as well as the predicted by other sulphide capacity prediction models. The calculated equilibrium mole numbers, mass action concentrations of structural units or ion couples and optical basicity are recommended to represent slag composition for correlating with sulphide capacity of the slags compared with mass percentage of components or binary slag basicity. The developed IMCT model can calculate not only the total sulphide capacity of the slags but also the respective sulphide capacity of free CaO and MgO in the slags. Largely increasing Al2O3 content from 15 to 25% and decreasing CaO content from 40 to 34%, MgO content from 9 to 4% can improve contribution of free CaO from 97 to 99% while decreasing contribution of free MgO from 3 to about 1% to the total sulphide capacity of CaO-SiO2-MgO-Al2O3 ironmaking slags
Lettre de Cao Yan lu 曹 延 祿.
No full textNumérisation effectuée à partir d'un document original.Déb. manque. Document officiel accompagnant des offrandes destinées à un monastère ; leur usage est indiqué en car. plus petits (col. 1 et 2). A la fin du ms. apparaissent sur 1 col. : la date, 3e mois de la 2e année duan gong (989), les titres de Cao Yan lu qui, à cette date, est gui yi jun jie du shi, jian jiao tai shi, jian zhong shu ling, Dun huang wang 歸 義 軍 節 度 使 檢 校 太 師 兼 中 書 令 燉 煌 王, et enfin, en petits car. à l'encre pâle, sa signature Yan lu. Sur la dernière col., impression d'un sceau à l'encre rouge : Gua Sha deng / zhou guan cha / shi xin yin 瓜 沙 等 / 州 觀 察 / 使 新 印 (encadrement : 5,8 × 5,8 cm). Repr. (pl. I) et signalé dans la liste de Chen Tsu-lung in MIHEC , 1 p. 9. Écr. xing à tendance cao. Encre foncée. 7 col. Nombre de car. par col. variable pour la clarté de la présentation. Marges sup. et inf. variables pour la même raison
Early-late coordinated beam-scheduling aided MmWave cellular networks
No full textAs a benefit of using highly directional beams in millimeter wave systems the downlink inter-cell interference (ICI) imposed on the users can be mitigated, provided that the beams of neighbor cells do not point towards the user. We exploit this by designing a protocol for network-coordinated time-domain beam scheduling. Specifically, every pair of neighboring cells maintains a beam-collision table for recording the pairs that may inflict ICI upon each other. Then, to avoid beam-collision, the two neighbor cells exchange the necessary information to avoid their simultaneous activation. More explicitly, our protocolsupports a distributed cell coordination method without requiring any information exchange between the user and the base station, once the beam collision table has been established. Furthermore, our theoretical analysis and numerical simulations demonstrate that the proposed protocol is capable of efficiently mitigating the ICI between the adjacent cells and hence improves the overall network performance
KAJI SIFAT FISIK DAN MEKANIK BIOKOMPOSIT PLA DAN CaO DARI KERANG LOKAN DENGAN MEDIA PELELEHAN VCO
No full textPenambahan serbuk CaO diharapkan dapat membantu proses pengobatan
pada tulang sehingga tidak memerlukan tindakan oprasi ke dua untuk pengangkatan
implan. Penelitian ini bertujuan untuk menganalisa pengaruh variasi penambahan
CaO ke dalam PLA dengan media pelelehan VCO dan menganalisa pengaruh waktu
natural aging terhadap kekuatan mekanik dan fisik.
Bahan penelitian terdiri dari PLA, VCO dan CaO yang bersifat degradable,
tetapi sebagaimana polimer, dalam Poly Lactic Acid (PLA) tergantung pada tingkat
atau jumlah molekul. PLA dan serbuk CaO dicampur, dengan VCO sebagai pelarut.
serbuk CaO 100 mesh dibuat dari cangkang kerang lokan yang dikalsinasi selama
6 jam pada suhu 900°C. VCO dipanaskan pada 150°C, PLA leleh dengan 10 menit.
CaO dengan komposisi 0%, 5%, 10% dan 15% diaduk hingga merata, dituangkan
ke dalam cetakan dengan penekanan 50 kg. Kemudian dilakukan natural aging
selama 7 dan 15 hari, pengujian tarik, kekerasan, densitas dan daya serap air
diberikan pada sampel-sampel setelahnya.
Hasil penelitian menjelaskan bahwa semakin banyak penambahan serbuk
CaO dapat mengurangi nilai kekuatan tarik komposit tetapi, diperoleh hasil yang
berbeda dari pada nilai kekerasan, densitas dan daya serap air yang mengalami
peningkatan seiring dengan bertambahnya campuran serbuk CaO dan semakin lama
waktu natural aging maka sifat mekanik dan fisik komposit semakin baik. kekuatan
tarik yang tertinggi 6.11 MPa pada komposisi PLA 95% dan CaO 5% setelah
natural aging 15 hari, kekuatan tarik terendah 1.64 MPa pada komposisi PLA 85%
dan CaO 15% setelah natural aging 7 hari. Kekerasan tertinggi yaitu pada
komposisi PLA 85% dan CaO 15% sebesar 94 SHA setelah natural aging 15 hari,
kekerasan terendah pada komposisi PLA 95% dan CaO 5% 92.2 SHA setelah
natural aging 7 hari. Densitas tertinggi pada komposisi PLA 85% dan CaO 15%
sebesar 1.45 g/cm3
setelah natural aging selama 7 hari, dan densitas terendah pada
komposisi CaO 0% sebesar 0.9 g/cm3
setelah natural aging 7 hari. Daya serap air
tertinggi 20.42 % pada komposisi PLA 85% dan CaO 15% setelah natural aging
selama 7 hari, dan daya serap terendah 0% komposisi 0% CaO.
Kata kunci: Implan, PLA, CaO, VCO, Komposi
Stabilization/Solidification of Nitrobenzene Contaminated Soil based on Hydrophobilized CaO
No full textAbstractLime, one of the common binders used in Solidification/Stabilization (S/S), is not adequate to immobilize toxic organic compounds of high-concentration released into soil by accidents in petrochemical and chemical industries. CaO, the main composition of lime, was hydrophobilized with stearic acid (SA) and silane coupling agent (KH570) to improve its fixation of nitrobenzene in S/S remediation of contaminated soil in present work, and the effect of hydrophobilized CaO on toxic organic compound encapsulation was evaluated through leaching and volatilization tests. Results showed that the binder composed of 20% SA hydrophobilized CaO together with 10% original CaO could reduce nitrobenzene's volatilization ratio to 0.096% and leaching ratio to 8.79%, while the nitrobenzene's volatilization ratio is 0.413% and leaching ratio is 35.48% with 30% original CaO as the binder
A Guiding Vector-Field algorithm for path-following control of nonholonomic mobile robots
No full textIn this paper, we propose an algorithm for path-following control of the nonholonomic mobile robot based on the idea of the guiding vector field (GVF). The desired path may be an arbitrary smooth curve in its implicit form, that is, a level set of a predefined smooth function. Using this function and the robot's kinematic model, we design a GVF, whose integral curves converge to the trajectory. A nonlinear motion controller is then proposed, which steers the robot along such an integral curve, bringing it to the desired path. We establish global convergence conditions for our algorithm and demonstrate its applicability and performance by experiments with wheeled robots.Accepted Author ManuscriptTeam Tamas Keviczk
Structural Characterization of the Chlorophyllide a Oxygenase (CAO) Enzyme Through an In Silico Approach
No full textChlorophyllide a oxygenase (CAO) is responsible for converting chlorophyll a to chlorophyll b in a two-step oxygenation reaction. CAO belongs to the family of Rieske-mononuclear iron oxygenases. Although the structure and reaction mechanism of other Rieske monooxygenases have been described, a member of plant Rieske non-heme iron-dependent monooxygenase has not been structurally characterized. The enzymes in this family usually form a trimeric structure and electrons are transferred between the non-heme iron site and the Rieske center of the adjoining subunits. CAO is supposed to form a similar structural arrangement. However, in Mamiellales such as Micromonas and Ostreococcus, CAO is encoded by two genes where non-heme iron site and Rieske cluster localize on the distinct polypeptides. It is not clear if they can form a similar structural organization to achieve the enzymatic activity. In this study, the tertiary structures of CAO from the model plant Arabidopsis thaliana and the Prasinophyte Micromonas pusilla were predicted by deep learning-based methods, followed by energy minimization and subsequent stereochemical quality assessment of the predicted models. Furthermore, the chlorophyll a binding cavity and the interaction of ferredoxin, which is the electron donor, on the surface of Micromonas CAO were predicted. The electron transfer pathway was predicted in Micromonas CAO and the overall structure of the CAO active site was conserved even though it forms a heterodimeric complex. The structures presented in this study will serve as a basis for understanding the reaction mechanism and regulation of the plant monooxygenase family to which CAO belongs
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