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ABSTRACT: Efficient laser-diode pumped self-Q-switched Cr,Yb:YAG lasers by bonding Yb:YAG crystal to increase pump power absorption efficiency have been demonstrated for the first time to our best knowledge. The effect of transmission of output coupler (TOC) on the laser performance has been investigated and found that the best laser performance was achieved with TOC = 50%. Average output power of 1 W was obtained with TOC = 50% at absorbed pump power of 5.4 W; corresponding optical-to-optical efficiency of 18.5% was obtained with respect to the absorbed pump power. Slope efficiency of 25% was measured with TOC = 50%. Laser pulses with pulse width of 26 ns, pulse energy of 37 µJ, and corresponding peak power of 1.4 kW with TOC = 50% were obtained. The lasers oscillate in multi-longitudinal-mode; number of the modes increases from two to five with pump power, owing to the mode selection by Cr,Yb:YAG thin plate acting as an intracavity etalon. (© 2011 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) (© 2011 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA)
Laser Physics Letters 05/2011; 8(8):591 - 597. · 9.97 Impact Factor
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P. Chen,
Q. Tian,
S.J. Baek,
X.L. Shang,
A. Park,
Z.C. Liu,
X.Q. Yao,
J.Z. Wang,
X.H. Wang, Y. Cheng,
J. Peng,
A.G. Shen,
J.M. Hu
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ABSTRACT: Early and differential diagnosis of Alzheimer's disease (AD) is a problem that puzzled many doctors. Reliable markers in easy-assembling samples are of considerable clinical diagnostic value. In this work, laser Raman spectroscopy (LRS) was developed a new method that potentially allows early and differential diagnosis of AD from the platelet sample. Raman spectra of platelets isolated from different ages of AD transgenic mice and non-transgenic controls were collected and analyzed. Multilayer perceptron networks (MLP) classification method was used to classify spectra and establish the diagnostic models. For differential diagnosis, spectra of platelets isolated from AD, Parkinson’s disease (PD) and vascular dementia (VD) mice were also discriminated. Two notable spectral differences at 740 and 1654 cm–1 were revealed in the mean spectrum of platelets isolated from AD transgenic mice and the controls. MLP displayed a powerful ability in the classifying of early, advanced AD and the control group, and in differential diagnosis of PD and advanced AD, as well as VD and advanced AD. The results suggest that platelet detecting by LRS coupled with MLP analysis appears to be an easy and accurate method for early and differential diagnosis of AD. This technique could be rapidly promoted from laboratory to the hospital. (© 2011 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) (© 2011 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA)
Laser Physics Letters 05/2011; 8(7):547 - 552. · 9.97 Impact Factor
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A Andreani,
A Andreazza,
A Annovi,
M Beretta,
V Bevacqua,
M Bogdan,
E Bossini,
A Boveia,
F Canelli, Y Cheng, [......],
A Todri,
R Tripiccione,
J Tuggle,
V Vercesi,
M Villa,
R A Vitullo,
G Volpi,
J Wu,
K Yorita,
J Zhang
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ABSTRACT: The existing three-level ATLAS trigger system is deployed to reduce the event rate from the bunch crossing rate of 40 MHz to ~ 200 Hz for permanent storage at the LHC design luminosity of 1034 cm−2 s−1. When the LHC exceeds the design luminosity, the load on the Level-2 trigger system will significantly increase due both to the need for more sophisticated algorithms to suppress background and the larger event sizes. The Fast Tracker is a proposed upgrade to the current ATLAS trigger system that will operate at the full Level-1 accepted rate of 100 kHz and provide high quality tracks at the beginning of processing in the Level-2 trigger, by performing track reconstruction in hardware with massive parallelism of associative memories. The concept design is being advanced and justified with the performance in important physics areas, b-tagging, τ-tagging and lepton isolation. The prototyping with current technology is underway and R&D with new technologies has been started.
Journal of Instrumentation 12/2010; 5(12):C12037. · 1.87 Impact Factor
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ABSTRACT: Our previous studies have found that the levels of cytochrome P450 and oxidative activities of cytochrome P450 monooxygenases were enhanced in a fenvalerate-resistant strain (HDFR) of Helicoverpa armigera (Hübner) in China, comparing with those of a susceptible strain (HDS). Here, we report the molecular cloning and gene expression of a specific P450 CYP6B7 from HDFR and HDS strain of H. armigera. Comparison of the deduced amino acid sequence showed that there were three substitutions of amino acids in the coding region of CYP6B7 cDNA of HDFR strain, comparing with that of HDS strain. Meanwhile, there were three mutative nucleotides in the intron of CYP6B7 genomic DNA in HDFR strain. Northern blotting analysis showed that the expression of CYP6B7 mRNA in HDFR strain of H. armigera was more than 5-fold higher than that in HDS strain. Further studies indicated that the expression of CYP6B7 mRNA increased as the larvae developed; however, it was rarely detected in the pupae and adult stages. The results suggested that cytochrome P450 CYP6B7 plays an important role in the pyrethroid insecticide fenvalerate resistance of HDFR strain of H. armigera; over-expression of CYP6B7 combined with relevant substitution of amino acids might be responsible for fenvalerate-resistance in H. armigera from China.
Journal of Applied Entomology 11/2010; 134(9‐10):754 - 761. · 1.31 Impact Factor
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A. Andreani,
A. Andreazza,
A. Annovi,
M. Beretta,
V. Bevacqua,
M. Bogdan,
E. Bossini,
A. Boveia,
F. Canelli, Y. Cheng, [......],
A. Todri,
R. Tripiccione,
J. Tuggle,
V. Vercesi,
M. Villa,
R.A. Vitullo,
G. Volpi,
J. Wu,
K. Yorita,
J. Zhang
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ABSTRACT: As the LHC luminosity is ramped up to 3×10<sup>34</sup> cm<sup>-2</sup> s<sup>-1</sup> and beyond, the high rates, multiplicities, and energies of particles seen by the detectors will pose a unique challenge. Only a tiny fraction of the produced collisions can be stored on tape and immense real-time data reduction is needed. An effective trigger system must maintain high trigger efficiencies for the physics we are most interested in, and at the same time suppress the enormous QCD backgrounds. This requires massive computing power to minimize the online execution time of complex algorithms. A multi-level trigger is an effective solution for an otherwise impossible problem. The Fast Tracker (FTK) is a proposed upgrade to the current ATLAS trigger system that will operate at full Level-1 output rates and provide high quality tracks reconstructed over the entire detector by the start of processing in Level-2. FTK solves the combinatorial challenge inherent to tracking by exploiting massive parallelism of associative memories that can compare inner detector hits to millions of pre-calculated patterns simultaneously. The tracking problem within matched patterns is further simplified by using pre-computed linearized fitting constants and leveraging fast DSPs in modern commercial FPGAs. Overall, FTK is able to compute the helix parameters for all tracks in an event and apply quality cuts in less than 100 μs. The system design is defined and studied with respect to high transverse momentum (high-P<sub>T</sub>) Level-2 objects: b-jets, tau-jets, and isolated leptons. We test FTK algorithms using ATLAS full simulation with WH events up to 3×10<sup>34</sup> cm<sup>-2</sup> s<sup>-1</sup> luminosity and comparing FTK results with the offline tracking capability. We present the architecture and the reconstruction performances for the mentioned high-P<sub>T</sub> Level-2 objects.
Real Time Conference (RT), 2010 17th IEEE-NPSS; 06/2010
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Y. Cheng,
Y. Dong,
J. Wang,
M. Dong,
Y. Zou,
D. Ren,
X. Yang,
M. Li,
A. Schrader,
M. Rohr,
W. Liu
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ABSTRACT: J. Cosmet. Sci., 60, 7–14 (January/February 2009)SynopsisFor human skin, high water content and low sebum secretion are considered to be main features of fair skin. To explore the proper personal care regimen for facial skin, we investigated the change of skin physiologic parameters after cosmetic application by measuring the skin water content, transepidermal water loss, and skin sebum secretion on facial skin before and after the cosmetic application using the Corneometer, Tewameter, and Sebumeter, respectively. The results indicated that the cosmetics application kept a higher water content and a lower transepidermal water loss, and at the same time, a lower sebum secretion 4 h and 8 h after the cosmetic application, compared with those before it. The situation was maintained in the succeeding three week continuous use of the cosmetics. It could be concluded that the cosmetic application on human facial skin might provide some moisturizing effect and at the same time an anti-sebum effect, which favors the maintenance of good skin physiological function after applying skin care products. Our results might provide a scientific personal care regimen for human facial skin to prompt the balance for the hydrolipid film on skin.
International journal of cosmetic science 01/2010; 32(1):81 - 81.
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ABSTRACT: Precocious puberty is a major constraint to the economical rearing Eriocheir sinensis farming. Although dietary phospholipid (PL) and highly unsaturated fatty acids (HUFA) reportedly enhanced ovarian development in normal adult E. sinensis, it had opposite effects of reducing precocity in juveniles. This study investigated the effects of dietary PL and HUFA on survival, gonadal development and biochemical composition of precocious E. sinensis. Two diets with PL and HUFA supplementation (diet A) and deficient (diet B) were formulated and fed to precocious E. sinensis. Although no significant differences were found on survival and gonadosomatic index of crabs fed both diets, crabs fed diet B had significantly higher hepatosomatic index and hepatopancrean lipid content than crabs fed diet A. The percentages, 14:0, 18:1n-9, 20:5n-3 and 22:6n-3, in hepatopancreas, muscle and gonads were positively correlated to the diets. Interestingly, the crabs fed diet B accumulated significantly higher 18:2n-6 in gonads and muscle than those fed diet A. Furthermore, substantially higher 20:4n-6 was detected in the gonad and muscle than in the diets. These results suggested that dietary PL and HUFA had limited effects on male gonad biochemical composition. Meanwhile, the precocious E. sinensis may be capable of negating the negative effects of HUFA deficiency by enhanced tissue 18:2n-6 accumulation and converting 18:2n-6 to 20:4n-6.
Aquaculture Nutrition 11/2008; 16(1):25 - 36. · 2.18 Impact Factor
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Advanced Functional Materials 08/2007; 17(15):2983 - 2990. · 10.18 Impact Factor
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ABSTRACT: The gel-forming properties of silver carp surimi made in different seasons were compared. Surimi prepared in winter and spring formed gel at 30°C, while autumn and summer surimi required a higher temperature of 40°C for gel formation. All surimi showed marked disintegration when incubated at 60°C. Ca2+-ATPase inactivation rate of myofibrils prepared from 4 surimi samples showed that myofibrils in autumn and summer surimi were much more stable than those in winter and spring surimi by about 10°C. These results demonstrated a close relationship between the gel-forming temperature of surimi and the thermal stability of myofibrils in surimi, namely that autumn and summer surimi containing stable myofibrils required higher temperature than winter and spring surimi for the gel formation.
Journal of Food Science 05/2006; 70(5):C326 - C331. · 1.66 Impact Factor
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Advanced Functional Materials 05/2006; 16(9):1203 - 1208. · 10.18 Impact Factor
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ABSTRACT: Spread of necrotic and non-necrotic strains of Bean yellow mosaic virus (BYMV) was compared when aphid vectors moved both types from external or internal virus sources to plots of Lupinus spp. (lupin). Regardless of whether virus sources were internal or external, removed or left in place, and spread was within plots with homologous sources or across buffers to plots containing the opposite type of virus source, non-necrotic BYMV always spread faster than necrotic BYMV in plots of L. angustifolius (narrow-leafed lupin). When necrotic BYMV spread from external sources into plots sown with two L. angustifolius genotypes differing in their necrosis responses to different BYMV strain groups and one genotype of L. luteus (yellow lupin) giving only non-necrotic responses, differing symptom reactions in the two L. angustifolius genotypes revealed presence of two distinct necrotic BYMV strain groups and overall virus spread was greater in this species than in L. luteus. Spread of non-necrotic BYMV in L. angustifolius was always polycyclic in nature. However, when it came initially from external sources, spread of necrotic BYMV was largely monocyclic. This work demonstrates how temporal virus spread can be diminished when hypersensitive (necrotic) resistance is deployed and the limitations associated with employing hypersensitivity that is strain specific.
Annals of Applied Biology 03/2005; 140(1):69 - 79. · 2.18 Impact Factor
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ABSTRACT: Seeds of selected European and Japanese winter wheat cultivars were grown at two experimental sites in China, namely Yaan, Sichuan province (YA), and Yangzhou, Jiangsu province (YZ), where wheat yellow mosaic bymovirus (WYMV) was severe. There were some differential responses of the cultivars to the virus isolates present at the two sites. The complete nucleotide sequence of both RNAs of both virus isolates was determined. Their genome organization was identical to that reported for a Japanese isolate and the sizes were very similar. Nucleotide comparisons demonstrated that parts of the CI and NIa coding regions on RNA1 and the N-terminal part of the P2 coding region on RNA2 were particularly variable, while substantially conserved regions occurred in the 3′ UTR of RNA2, the 7K, one part of the CI and parts of the NIb and coat protein. It seems unlikely that differences in the 7K and NIa-VPg proteins are responsible for virulence differences and the CI and NIb regions were considered the most promising for further study.
Plant Pathology 12/2001; 49(3):370 - 374. · 2.13 Impact Factor
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08/1987; 19:1029.
