http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Contreras, Yanett,Sanhueza, Patricio,Jackson, James M.,Guzmá,n, André,s E.,Longmore, Steven,Garay, Guido,Zhang, Qizhou,Nguyê,x303,n-Lu’o’, Quang,Tatematsu, Ken’ichi,Nakamura, Fumita American Astronomical Society 2018 The Astrophysical journal Vol.861 No.1
<P>Using Galactic Plane surveys, we have selected a massive (1200M circle dot), cold (14 K) 3.6-70 mu m dark IRDC, G331.372-00.116. This infrared dark cloud (IRDC) has the potential to form high-mass stars, and given the absence of current star formation signatures, it seems to represent the earliest stages of high-mass star formation. We have mapped the whole IRDC with the Atacama Large Millimeter/submillimeter Array (ALMA) at 1.1 and 1.3 mm in dust continuum and line emission. The dust continuum reveals 22 cores distributed across the IRDC. In this work, we analyze the physical properties of the most massive core, ALMA1, which has no molecular outflows detected in the CO (2-1), SiO (5-4), and H2CO (3-2) lines. This core is relatively massive (M = 17.6M circle dot), subvirialized (virial parameter alpha(vir) = M-vir/M = 0.14), and is barely affected by turbulence (transonic Mach number of 1.2). Using the HCO+ (3-2) line, we find the first detection of infall signatures in a relatively massive, prestellar core (ALMA1) with the potential to form a high-mass star. We estimate an infall speed of 1.54 km s(-1) and a high accretion rate of 1.96. x. 10(-3) M circle dot yr(-1). ALMA1 is rapidly collapsing, out of virial equilibrium, which is more consistent with competitive accretion scenarios rather than the turbulent core accretion model. On the other hand, ALMA1 has a mass similar to 6 times larger than the clumps Jeans mass, as it is in an intermediate mass regime (M-J = 2.7 < M less than or similar to 30 M circle dot), contrary to what both the competitive accretion and turbulent core accretion theories predict.</P>
ANALYSIS OF THE PHASE STABILITY OF FINE Fe.90Ni.10ALLOY PARTICLES
H. M. Widatallah,R. S. Huang,Y. F. Hsia,X. M. Lee,J. H. Wang,H. X. Lu 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
A set of Fe_(1-x)Ni_x(x=0.10, 0.25, 0.30, 0.50, 0.60, 0.75, 0.85) fine particles prepared by the gas evaporation technique was studied by Moossbauer, XRD and other techniques. The XRD and Moossbauer patterns of the sample with x=0.10(Fe_(90)Ni_(10)) were found to be exceptionally different, showing an austenite phase stability when the particles are quenched. This phase stability is quite different from that of the corresponding bulk alloy. Using binomial distribution fits of the Moossbauer spectra of the particles in terms of nearest and text nearest neighbour configurations around the Fe atoms, and analysis of this phase stability is given. The changes in the relative intensities of the resulting magnetic sextets are used to determine the increase in martensite following the austenite-martensite transformation process. The stable austenite can, therefore, be determined. This stability may be related to the oxide surface layer and the small number of atoms of these fine particles.
Lu, Xiaoqing,Kazmierczak, Katarzyna,Jiang, Xiaoyu,Jones, Michelle,Watt, James,Helfman, David M.,Moore, Jeffrey R.,Szczesnax2010,Cordary, Danuta,Lossos, Izidore S. Blackwell Publishing Ltd 2011 The FEBS journal Vol.278 No.11
<P>Human germinal center associated lymphoma (HGAL) is a germinal center‐specific gene whose expression correlates with a favorable prognosis in patients with diffuse large B‐cell and classic Hodgkin lymphomas. HGAL is involved in negative regulation of lymphocyte motility. The movement of lymphocytes is directly driven by actin polymerization and actin–myosin interactions. We demonstrate that HGAL interacts directly and independently with both actin and myosin and delineate the HGAL and myosin domains responsible for the interaction. Furthermore, we show that HGAL increases the binding of myosin to F‐actin and inhibits the ability of myosin to translocate actin by reducing the maximal velocity of myosin head/actin movement. No effects of HGAL on actomyosin ATPase activity and the rate of actin polymerization from G‐actin to F‐actin were observed. These findings reveal a new mechanism underlying the inhibitory effects of germinal center‐specific HGAL protein on lymphocyte and lymphoma cell motility.</P>
Jin, Jiezhu,Lu, Shengx2010,Guo,Chanthad, Chalathorn,Zhang, Qiming,Haque, M. A.,Wang, Qing WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.33
<P><B>Multiferroic laminate composites</B> consisting of chain‐end cross‐linked ferroelectric polymers and magnetostrictive Metglas are reported. The composites exhibit a greatly enhanced multiferroic voltage coefficient and sensitivity relative to analogous composites. These remarkable properties are attributed to high piezoelectric and electromechanical coupling coefficients, because of the formation of larger crystalline sizes and concurrent improvement in the polarization ordering in the cross‐linked polymers.</P>
Michalak, Anna M.,Anderson, Eric J.,Beletsky, Dmitry,Boland, Steven,Bosch, Nathan S.,Bridgeman, Thomas B.,Chaffin, Justin D.,Cho, Kyunghwa,Confesor, Rem,Dalox11f,lu, Irem,DePinto, Joseph V.,Evans, M National Academy of Sciences 2013 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.110 No.16
<P>In 2011, Lake Erie experienced the largest harmful algal bloom in its recorded history, with a peak intensity over three times greater than any previously observed bloom. Here we show that long-term trends in agricultural practices are consistent with increasing phosphorus loading to the western basin of the lake, and that these trends, coupled with meteorological conditions in spring 2011, produced record-breaking nutrient loads. An extended period of weak lake circulation then led to abnormally long residence times that incubated the bloom, and warm and quiescent conditions after bloom onset allowed algae to remain near the top of the water column and prevented flushing of nutrients from the system. We further find that all of these factors are consistent with expected future conditions. If a scientifically guided management plan to mitigate these impacts is not implemented, we can therefore expect this bloom to be a harbinger of future blooms in Lake Erie.</P>
Zhang, G.,Zhu, M.,Guo, J.,Ma, J.,Wang, X.,Lu, H.,Qiu, L. Elsevier Science 2014 ORGANIC ELECTRONICS Vol.15 No.10
A series of benzodithiophene (BDT) and benzotrithiophene (BTT)-based conjugated polymers (P1-P4), with/without conjugated- and acyl-side chain, have been synthesized by Stille cross-coupling reaction. Their thermal, photophysical, electrochemical properties, devices performances, and microstructure have been investigated. Conjugated-side chain can significantly raise the thermal stability and acyl-side chain can lower HOMO/LUMO energy levels. Organic thin-film transistors (OTFTs) based on conjugated polymers were fabricated and the transistor electrical characterization showed the device performance was sensitive to the conjugated- and acyl-side chain substituent of polymers. A maximum hole mobility of 1.70x10<SUP>-3</SUP>cm<SUP>2</SUP>V<SUP>-1</SUP>s<SUP>-1</SUP> was obtained for P1-based devices, which is an order of magnitude higher than those of P3 and P4-based devices. The corresponding microstructures were investigated by grazing-incidence X-ray diffraction (GIXD) to correlate with conjugated- and acyl-side chain dependent carrier mobility of P1-P4. The results showed that the conjugated- and acyl-side chain have an impact on the polymer packing models and device performances.
Jeon, Jong-Sup,Kim, Han-Taek,Kim, Myeong-Gil,Oh, Moon-Seog,Hong, Se-Ra,Yoon, Mi-Hye,Shin, Ho-Chul,Shim, Jae-Han,Afifi, Nehal Aly,Hacımü,ftü,ox11f,lu, Ahmet,Abd El-Aty, A. M. Springer-Verlag 2016 Chromatographia Vol.79 No.13
<P>A simultaneous analytical method was developed and validated to quantify three lipophilic compounds; namely glabridin (an isoflavonoid isolated from crude licorice), (-)-alpha-bisabolol (a sesquiterpene alcohol obtained from plant extracts), and ascorbyl tetraisopalmitate (a fat-soluble molecule derived from vitamin C) in functional cosmetic cream using high-performance liquid chromatography (HPLC) coupled with photodiode array detection (PAD). Cosmetic cream samples were extracted with a mixture of acetonitrile and isopropyl alcohol (45:55, v/v) and the target compounds were separated on a C-18 column with a gradient mobile phase consisting of deionized water, acetonitrile, and isopropyl alcohol. The detector wavelengths were 228, 202, and 221 nm, for glabridin, (-)-alpha-bisabolol, and ascorbyl tetraisopalmitate, respectively. The calibration curves showed good linearity with determination coefficients (R (2)) a parts per thousand yen 0.999. The mean recoveries were ranged between 89.8 and 103.9 % with relative standard deviations (RSDs) < 5 %. The intra- and inter-day precision was < 2 %. The limits of detection (LODs) were 0.03, 0.4, and 4.02 mu g mL(-1) for glabridin, (-)-alpha-bisabolol, and ascorbyl tetraisopalmitate, respectively. The method was successfully applied for monitoring 11 market samples, in which glabridin was quantified in the range of 17.5-25 mg 100 g(-1), (-)-alpha-bisabolol in the range of 25.1-677 mg 100 g(-1), and 140.6-291.5 mg 100 g(-1) for ascorbyl tetraisopalmitate. The proposed analytical method is simple, sensitive, and versatile and can be used for the quantification of lipophilic compounds in cosmetics in a single chromatographic run.</P>
Rahman, Md. Musfiqur,Abd El-Aty, A.M.,Kabir, Md. Humayun,Chung, Hyung Suk,Lee, Han Sol,Hacımü,ftü,ox11f,lu, Fazil,Jeong, Ji Hoon,Chang, Byung-Joon,Shin, Ho-Chul,Shim, Jae-Han Elsevier 2018 Food chemistry Vol.239 No.-
<P><B>Abstract</B></P> <P>A simple and effective method was developed for analyzing dinotefuran and its three metabolites (MNG, UF, and DN) in plum using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Due to the polarity and high water miscibility, dinotefuran and some of its metabolites (especially DN) have some limitations to be extracted with acetonitrile and salt following the “QuEChERS” sample preparation methodology. Alternatively, the samples were extracted with methanol, and purified with dispersive-solid phase extraction procedure (d-SPE) using primary secondary amine (PSA) and C<SUB>18</SUB> sorbents after filtration, and mass up. Due to the suppression effect originated from plum matrix, matrix-matched calibration curves, which provided good linearity with coefficient of determination (<I>R<SUP>2</SUP> </I>)≥0.998, were used for quantification of all analytes. Blank plum samples fortified with 2 spiking levels (10×LOQ and 50×LOQ) yielded satisfactory recoveries for all tested analytes in the range of 83.01 to 110.18% with relative standard deviation (RSD)≤8.91. The method was successfully applied to field-incurred plum samples and dinotefuran and all metabolites were positively detected and quantified. In conclusion, we suggest that the method can be expanded to polar compounds having solvent and partitioning problems in any of the versions of QuEChERS.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A simultaneous method was developed for dinotefuran and its highly polar metabolites in plum. </LI> <LI> Mass-up was introduced instead of salting out for exact quantitation. </LI> <LI> Internal standard is not needed for the newly developed methodology. </LI> <LI> The method can be used either as it is or with slight modification in other matrices. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>