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    Wyświetlanie 1-10 z 10
    Tytuł:
    Ultrafast Carrier Trapping and High Resistivity of MeV Energy Ion Implanted GaAs
    Autorzy:
    Korona, K. P.
    Jasiński, J.
    Kurpiewski, A.
    Kamińska, M.
    Jagadish, C.
    Tan, H. H.
    Krotkus, A.
    Marcinkevicius, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1951117.pdf
    Data publikacji:
    1996-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Vv
    72.20.Jv
    72.80.Ey
    Opis:
    Semi-insulating GaAs wafers were implanted with MeV As, Ga, O or Si ions at doses ranging from 1×10$\text{}^{14}$ to 5×10$\text{}^{16}$ cm$\text{}^{-2}$. Their structural properties were studied by electron microscopy and the Rutherford backscattering-channeling. Time resolved photoluminescence, electrical conductivity and the Hall effect were used to determine carrier lifetime and electrical properties of the material. Annealing of the samples at 600°C led to the recovery of transport in conduction band. The As, Ga and O implanted samples became semi-insulating, while the Si implanted samples were n-type. Carrier trapping times were short, shorter than 1 ps for the highest dose used. Models explaining the fast photocarrier decay are discussed.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 4; 851-854
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of Arsenic Antisite Defect in Nonstoichiometric Gallium Arsenide
    Autorzy:
    Jasiński, J.
    Kurpiewski, A.
    Korοna, K.
    Kamińska, M.
    Ρalczewska, M.
    Krotkus, A.
    Marcinkievicius, S.
    Liliental-Weber, Z.
    Tan, H. H.
    Jagadish, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933772.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.Er
    73.90.+f
    Opis:
    Over the last few years there have been many studies of GaAs layers grown at low temperatures (180-300°C), so called LT GaAs. The interest in LT GaAs was motivated by the potential application of 600oC annealed LT GaAs in microwave and fast optoelectronic devices because of its short photocarrier lifetime, reasonable mobility and high resistivity. These properties are associated with the nonstoichiometry of LT GaAs. Recently, studies of comparable material, nonstoichiometric GaAs produced by arsenic ion implantation have been initiated. There is still a strong controversy as to whether the arsenic antisite (As$\text{}_{Ga}$) or arsenic precipitates are responsible for unique electrical properties of both materials. This paper presents the results of structural and electrical studies of high energy As implanted GaAs and comments on relationships between the structure and the resulting electrical properties.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 747-750
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Natural Fibers on the Fresh and Hardened Properties of Self-Compacting Concrete (SCC)
    Autorzy:
    Tan, Vicente Miguel A.
    Yambao, Mon Emilbert F.
    Bravo, Rodrigo Rafael
    Familara, Joanne A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1076564.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Coconut Fiber
    Filling Ability
    Passing ability
    Rice Straw Fiber
    Segregation Resistance
    Self-Compacting Concrete
    Opis:
    The main purpose of the study is to explore the effect of the plant fibers having different volume fraction on the fresh properties of the mix design of SCC such as filling ability, passing ability and segregation resistance as well as its influence on the compressive strength of the hardened SCC. The study started by conducting preliminary test on the aggregates needed in the construction of SCC. The aggregates were mixed together until uniform consistency was attained. Different volume fractions of CN and RS fibers were added on the mix design and molded in a cylindrical molder. The concrete were dried for 48 hours then placed in curing tank. Filling ability were tested by means of slump flow and T500 test. Passing ability were tested using J-ring while segregation resistance were tested using V-funnel and T5min. Hardened SCC with plant fibers were tested for its compressive strength. Based from the collected data, the filling ability were significantly affected by decreasing the slump flow of self-compacting concrete while increasing the time of SCC to spread to a diameter of 500 mm (T500). Furthermore, the passing ability and segregation resistance of SCC increases upon adding various volume fractions of CN and RS fibers. Statistical analysis further proves that there is significant difference between the normal SCC and the SCC with different percentages of CN and RS fibers. In addition, most favorable compressive strength were found when 0.05% CN fiber and 0.10% RS fiber were added to SCC after 7 and 28 curing days.
    Źródło:
    World Scientific News; 2019, 115; 229-241
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frothers and gas dispersion: A review of the structure-property-function relationship
    Autorzy:
    Tan, Y. H.
    Finch, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/109942.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    frothers
    alcohols
    polyglycols
    frother structure
    mechanisms
    Opis:
    Over the past 20 years quantitative measures of frother functions have been developed to try to replace such qualitative descriptors as “weak” and “strong”. One of these metrics is the critical coalescence concentration (CCC) that quantifies a frother’s ability to reduce bubble size; another is the concentration at minimum velocity (CMV) that quantifies a frother’s ability to reduce bubble rise velocity. The experimental procedure for the two measures is briefly outlined and the measures are shown to be related. Using CMV, based on more than 50 surfactants from the two main frother families, alcohols and polyglycols, the frother structure-property-function link is investigated. The structure variables were: in alcohols, alkyl chain length, and position of the methyl branch and hydroxyl group(s); and in polyglycols, alkyl chain length, and number of propylene oxide (PO) or ethylene oxide (EO) groups. On the argument that low CMV represents the desired outcome, the main findings are: the dominant effect of alkyl chain length in both alcohols and polyglycols; that for alcohols branched-chain isomers are superior to straight chain, with the best combination being OH at the terminus and the methyl branch as far away as possible; and for polyglycols, PO-based are superior to EO-based. Interpretation of these observations included the effect of structure on the following properties: surface activity, mass transfer rate, H-bonding, and molecule packing.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 1; 40-53
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors influencing serum chemerin and kallistatin concentrations in patients with alcohol-induced liver cirrhosis
    Autorzy:
    Prystupa, A.
    Kiciński, P.
    Luchowska-Kocot, D.
    Sak, J.
    Prystupa, T.K.
    Tan, Y.-H.
    Panasiuk, L.
    Załuska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082078.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    alcohol-induced liver cirrhosis
    chemerin
    kallistatin
    Opis:
    Introduction. In Poland, an increasing number of patients are hospitalized due to liver diseases. One of the common liver diseases is cirrhosis, which can be caused by alcohol, viral hepatitis, autoimmune processes and metabolic diseases. Materials and method. The study included 99 patients with alcoholic cirrhosis from the Lublin region of Eastern Poland. The control group consisted of 20 healthy individuals without liver disease who did not abuse alcohol. The concentrations of serum kallistatin and chemerin were determined using ELISA kits. Objective. The aim of the study is to evaluate serum levels of kallistatin and chemerin in patients with different stages of alcoholic liver cirrhosis. Results. The highest chemerin level was found in the control group – 182.6±80.4 ng/ml. In other stages of liver cirrhosis, the following levels were observed: 175.7±62.7 ng/ml in Child-Pugh stage A (Ch-P A), 150.2±59.7 ng/ml in Ch-P B and 110.3±73.6 ng/ml in Ch-P C. Significant differences in chemerin levels between controls and Ch-P C patients (p=0.01), as well as between the Ch-P A patients and Ch-P C patients (p=0.02), were demonstrated. The highest kallistatin level was demonstrated in the control group – 8.2±3.5 μg/ml. In other stages of liver cirrhosis, the following concentrations were found: 7.2±27 μg/ml in Ch-P A, 4.4±2.2 μg/ml in Ch-P B and 3.5±1.9 μg/ml in Ch-P C (Tab. 3). Statistically significant differences were observed between controls and Ch-P B patients (p<0.001), controls and Ch-P C patients (p<0.001), Ch-P A and Ch-P B patients (p=0.01), as well as Ch-P A and Ch-P C patients (<0.001). Conclusions. The levels of chemerin and kallistatin decrease with progression of liver damage during alcoholic liver cirrhosis. The impairment of its synthetic function leads to reductions in levels of the adipokines studied.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2019, 26, 1; 143-147
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of pH and time on hydrodynamic properties of dodecylamine
    Autorzy:
    Zhou, X.
    Tan, Y. H.
    Finch, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/109853.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    pH
    dodecylamine
    gas holdup
    froth height
    Frother function
    Opis:
    Gas holdup and froth height in the presence of dodecylamine (DDA, pKa = 10.63) are reported at three pH values. The results revealed a strong time effect for DDA: stability was reached at pH 3; not at natural pH, for example, gas holdup declining to the water only value; and at pH 11, while stability was reached quickly gas holdup was now less than in water alone indicating coalescence. In the first two cases, the time effect is attributed to loss of amine from the system as molecular amine, observed at natural pH as precipitates on the column wall. An argument for precipitation at pH < pKa is presented. At pH 11, coalescence is attributed to the oily nature of the molecular amine present as colloidal aggregates. Noting a difference in literature steady state gas holdup data at natural pH, it is speculated that varying steady states can be reached that corresponds to different levels of amine loss.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1237-1244
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Designing reverse logistics network in an omnichannel environment in Asia
    Projektowanie logistyki zwrotnej dla wielokanałowego systemu sprzedaży w Azji
    Autorzy:
    Angel, A.
    Tan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/362081.pdf
    Data publikacji:
    2018
    Wydawca:
    Wyższa Szkoła Logistyki
    Tematy:
    omni-channel
    reverse logistics
    supply chain management
    retail industry
    e-commerce
    wielokanałowość
    logistyka zwrotna
    zarządzanie łańcuchem dostaw
    handel detaliczny
    e-handel
    Opis:
    Background: Omni-channel retailers have been growing globally to connect with customers anywhere and thus blurring the line between online web store and the physical store to deliver a seamless customer experience. The complexities of reverse logistics in Omni-channel firms due to multiple product return options would require these firms to integrate their reverse logistics network in order to reduce the complexities. This forms the basis of this research and two Omni-channel companies’ in Asia are examined in this research. A four-staged framework for the reverse logistics management is being proposed and further developed through these real-life case studies. Methods: We conduct interviews with the staffs from two Omni-channel retailers with operations in Asia to verify their return policies and collect additional information from their websites and customers. We focused on reverse logistics, network design, Omni-channel and the interface between them. We identify a few key factors that influence decision in network design. From there, we propose a conceptual framework and applying it to the Omni-channel retailers to determine, if it is suitable and beneficial to the Omni-channel environment. Results: From the two company findings, it was understood from both of the cases that speed and efficiency is not only essential from the operations point of view, but also the total customer experience from the Omni-channel engagement. Another observation is that a company that makes their own products tend to centralize their reverse logistics operations for economics of scale, while those that rely on suppliers tend to decentralize their reverse logistics operations to leverage on their supplier’s distribution network so as to keep costs low. Conclusions: In this research, we have illustrated how our conceptual framework can be used in Omni-channel companies and how it could help companies design a more responsive and efficient reverse logistics network.
    Wstęp: W ostatnim czasie następuje istotny przyrost ilość firm sprzedażowych oferujących swoje towary poprzez wiele kanałów sprzedaży w celu lepszego dotarcia do klienta, zacierając przez to podziała pomiędzy sklepem on-line a tradycyjnym sklepem istniejącym fizycznie. Złożoność logistyki zwrotnej firm wielokanałowych związanej w wielością opcji zwrotu towaru wymaga od firm integracji logistyki zwrotnej w celu redukcji tej złożoności. W pracy zaprezentowano wyniki analizy na podstawie dwóch wielokanałowych firm, działających na terenie Azji. Zaproponowano czterostopniowy schemat zarządzania logistyką zwrotną. Metody: Przeprowadzono wywiady z zatrudnionymi w dwóch wielokanałowych firmach sprzedażowych, działających na terenie Azji w celu oceny ich polityki dotyczącej zwrotów oraz zebrano dodatkowe informacji na temat tych firm z dostępnych stron internetowych oraz od ich klientów. Głównymi elementami poddanymi ocenie była logistyka zwrotów, projekt sieci, kanałów oraz relacje między nimi. Zidentyfikowano kluczowe czynniki wpływające na kształt zaprojektowanej sieci. Na podstawie zebranych danych stworzono koncepcję, którą przedstawiono wielokanałowym firmom sprzedażowym w celu oceny jej przydatności. Wyniki: Na podstawie danych uzyskanych z analizowanych firm stwierdzono, że kluczowym jest szybkość i efektywność zarówno z punktu widzenia dokonywanych operacji jak i wobec oczekiwań klientów. U firmy oferującej produkty własne zaobserwowano tendencję do centralizacji logistyki zwrotów w celu uzyskania ekonomii skali. Natomiast u firmy, opierającej się na dostawcach zaobserwowano tendencję do decentralizacji operacji logistyki zwrotnej poprzez wykorzystanie sieci logistycznej dostawców i dzięki temu na obniżeniu kosztów całkowitych. Wnioski: W pracy zaprezentowano i zilustrowano koncepcję, mogącą mieć zastosowanie dla wielokanałowych firm, wspomagające je w zaprojektowaniu bardziej efektywnej sieci logistyki zwrotnej.
    Źródło:
    LogForum; 2018, 14, 4; 519-533
    1734-459X
    Pojawia się w:
    LogForum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    D(3He,p)4He and D(d,p)3H fusion in a small plasma focus operated in a deuterium helium-3 gas mixture
    Autorzy:
    Springham, S.
    Sim, T.
    Rawat, T.
    Lee, P.
    Patran, A.
    Shutler, P.
    Tan, T.
    Lee, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/147428.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    deuterium
    helium-3
    fusion
    CR-39
    track detectors
    Opis:
    Abstract A 3 kJ plasma focus was operated with a 3He-D2 gas mixture, with partial pressures in the ratio of 2:1, corresponding to an atomic number ratio of 1:1 for 3He and D atoms. The fusion reactions D(3He,p)4He and D(d,p)3H were measured simultaneously using CR-39 polymer nuclear track detectors placed inside a pinhole camera positioned on the forward plasma focus axis. A sandwich arrangement of two 1000 mi m thick CR-39 detectors enabled the simultaneous registration of two groups of protons with approximate energies of 16 MeV and 3 MeV arising from the D(3He,p)4He and D(d,p)3H reactions, respectively. Radial track density distributions were obtained from each CR-39 detector and per-shot average distributions were calculated for the two groups of protons. It is found that the D(3He,p)4He and D(d,p)3H proton yields are of similar magnitude. Comparing the experimental distributions with results from a Monte Carlo simulation, it was deduced that the D(3He,p)4He fusion is concentrated close to the plasma focus pinch column, while the D(d,p)3H fusion occurs relatively far from the pinch. The relative absence of D(d,p)3H fusion in the pinch is one significant reason for concluding that the D(3He,p)4He fusion occurring in the plasma focus pinch is not thermonuclear in origin. It is argued that the bulk of the D(3He,p)4He fusion is due to energetic 3He2+ ions incident on a deuterium target. Possible explanations for differing spatial distributions of D(3He,p)4He and D(d,p)3H fusion in the plasma focus are discussed.
    Źródło:
    Nukleonika; 2006, 51, 1; 47-53
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antioxidant capacity and phenolic contents of three Quercus species
    Autorzy:
    Thi Tuyen, P.
    Tan Khang, D.
    Thu Ha, P.T.
    Ngoc Hai, T.
    Elzaawely, A.A.
    Dang Xuan, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/11040.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    The antioxidant capability and phenolic contents of ethanol extracts (free phenolics) and ethyl acetate extracts (bound phenolics) of three Quercus species were estimated in this work. The antioxidant activities were examined by 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2′-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) free radical, reducing power and β-carotene bleaching methods. HPLC was employed to detect major phenolic acids. The leaf extract of Q. salicina contained maximum total phenolics while the highest total flavonoid content was found in the leaf extract of Q. serrata. The antioxidant activities varied among three species. Bark extract of Q. salicina was the most potential and it was closed to levels of the standard antioxidative dibutyl hydroxytoluene (BHT). The bark extract of Q. serrata also showed promising antioxidant activities despite their eminence was negligibly lower than Q. salicina. Stronger antioxidant activities of free phenolics than those of the bound phenolics may be attributed to higher quantities of free phenolics in the barks of Quercus species, however total flavonoids may not contribute a critical role. By HPLC analysis, thirteen phenolic acids were detected in the leaf and bark extracts. Of them, Q. salicina showed maximum in number (ten compounds) and quantities of detected phenolic acids. Ellagic, chlorogenic and benzoic acids were dominant in Quercus species. Findings of this study revealed that leaves and barks of three Quercus species are rich source of antioxidants, and Q. salicina is the most promising and should be elaborated to exploit its pharmaceutical properties.
    Źródło:
    International Letters of Natural Sciences; 2016, 54
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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