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Search Results: 1 - 10 of 61403 matches for " Yu Zhiyuan "
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Yu Zhiyuan,

电子与信息学报 , 1990,
Abstract: This paper presents a method to derive the dyadic Green's function of a loaded rectangular waveguide by image method. In the calculation of the DGF, it is simplified by using the integral transformation and replacing the multi-infinite summation with a single one. As an example of the DGF's application, the scattering field calculation of a metal sphere resting on the broad wall of the loaded rectangular waveguide is given by mo ney ethod. Results of calculations agree well with both data of experiments and those publisher.

GUO Encai,HAN Zhiyuan,YU Shuyou,

金属学报 , 1984,
Detecting Molecular Features of Spectra Mainly Associated with Structural and Non-Structural Carbohydrates in Co-Products from BioEthanol Production Using DRIFT with Uni- and Multivariate Molecular Spectral Analyses
Peiqiang Yu,Daalkhaijav Damiran,Arash Azarfar,Zhiyuan Niu
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12031921
Abstract: The objective of this study was to use DRIFT spectroscopy with uni- and multivariate molecular spectral analyses as a novel approach to detect molecular features of spectra mainly associated with carbohydrate in the co-products (wheat DDGS, corn DDGS, blend DDGS) from bioethanol processing in comparison with original feedstock (wheat ( Triticum), corn ( Zea mays)). The carbohydrates related molecular spectral bands included: A_Cell (structural carbohydrates, peaks area region and baseline: ca. 1485–1188 cm ?1), A_1240 (structural carbohydrates, peak area centered at ca. 1240 cm ?1 with region and baseline: ca. 1292–1198 cm ?1), A_CHO (total carbohydrates, peaks region and baseline: ca. 1187–950 cm -1), A_928 (non-structural carbohydrates, peak area centered at ca. 928 cm ?1 with region and baseline: ca. 952–910 cm ?1), A_860 (non-structural carbohydrates, peak area centered at ca. 860 cm ?1 with region and baseline: ca. 880–827 cm -1), H_1415 (structural carbohydrate, peak height centered at ca. 1415 cm ?1 with baseline: ca. 1485–1188 cm ?1), H_1370 (structural carbohydrate, peak height at ca. 1370 cm ?1 with a baseline: ca. 1485–1188 cm ?1). The study shows that the grains had lower spectral intensity (KM Unit) of the cellulosic compounds of A_1240 (8.5 vs. 36.6, P < 0.05), higher ( P < 0.05) intensities of the non-structural carbohydrate of A_928 (17.3 vs. 2.0) and A_860 (20.7 vs. 7.6) than their co-products from bioethanol processing. There were no differences ( P > 0.05) in the peak area intensities of A_Cell (structural CHO) at 1292–1198 cm ?1 and A_CHO (total CHO) at 1187–950 cm ?1 with average molecular infrared intensity KM unit of 226.8 and 508.1, respectively. There were no differences ( P > 0.05) in the peak height intensities of H_1415 and H_1370 (structural CHOs) with average intensities 1.35 and 1.15, respectively. The multivariate molecular spectral analyses were able to discriminate and classify between the corn and corn DDGS molecular spectra, but not wheat and wheat DDGS. This study indicated that the bioethanol processing changes carbohydrate molecular structural profiles, compared with the original grains. However, the sensitivities of different types of carbohydrates and different grains (corn and wheat) to the processing differ. In general, the bioethanol processing increases the molecular spectral intensities for the structural carbohydrates and decreases the intensities for the non-structural carbohydrates. Further study is needed to quantify carbohydrate related molecular spectral features of the bioethanol co-products in
Near infrared electrochromic variable optical attenuator based on ruthenium complex and polycrystalline tungsten oxide
Zhang Jidong,Wu Xianguo,Yu Hongan,Yan Donghang,Wang Zhiyuan
Chinese Science Bulletin , 2005, DOI: 10.1007/BF02899636
Abstract: A near infrared (NIR) electrochromic attenuator based on a dinuclear ruthenium complex and polycrystalline tungsten oxide was fabricated and characterized. The results show that the use of the NIR-absorbing ruthenium complex as a counter electrode material can improve the device performance. By replacing the visible electrochromic ferrocene with the NIR-absorbing ruthenium complex, the optical attenuation at 1550 nm was enhanced from 19.1 to 30.0 dB and color efficiency also increased from 29.2 to 121.2 cm2/C.
Metal-assisted electroless fabrication of nanoporous p-GaN for increasing the light extraction efficiency of light emitting diodes
Ruijun Wang,Duo Liu,Zhiyuan Zuo,Qian Yu
AIP Advances , 2012, DOI: 10.1063/1.3679150
Abstract: We report metal-assisted electroless fabrication of nanoporous p-GaN to improve the light extraction efficiency of GaN-based light emitting diodes (LEDs). Although it has long been believed that p-GaN cannot be etched at room temperature, in this study we find that Ag nanocrystals (NCs) on the p-GaN surface enable effective etching of p-GaN in a mixture of HF and K2S2O8 under ultraviolet (UV) irradiation. It is further shown that the roughened GaN/air interface enables strong scattering of photons emitted from the multiple quantum wells (MQWs). The light output power measurements indicate that the nanoporous LEDs obtained after 10 min etching show a 32.7% enhancement in light-output relative to the conventional LEDs at an injection current of 20 mA without significant increase of the operating voltage. In contrast, the samples etched for 20 min show performance degradation when compared with those etched for 10 min, this is attributed to the current crowding effect and increased surface recombination rate.
A Multipath Routing Algorithm Based on Traffic Prediction in Wireless Mesh Networks  [PDF]
Zhiyuan LI, Ruchuan WANG
Communications and Network (CN) , 2009, DOI: 10.4236/cn.2009.12013
Abstract: The technology of QoS routing has become a great challenge in Wireless Mesh Networks (WMNs). There exist a lot of literatures on QoS routing in WMNs, but the current algorithms have some deficiencies, such as high complexity, poor scalability and flexibility. To solve the problems above, a multipath routing algorithm based on traffic prediction (MRATP) is proposed in WMNs. MRATP consists of three modules including an algo-rithm on multipath routing built, a congestion discovery mechanism based on wavelet-neural network and a load balancing algorithm via multipath. Simulation results show that MRATP has some characteristics, such as better scalability, flexibility and robustness. Compared with the current algorithms, MRATP has higher success ratio, lower end to end delay and overhead. So MRATP can guarantee the end to end QoS of WMNs.
Application of Integrated Reorganization of Science Specimen Data Using Kettle  [PDF]
Zhiyuan Wu, Yang Mei
Intelligent Information Management (IIM) , 2019, DOI: 10.4236/iim.2019.111002
Abstract: Standards and specifications are the premise of integrated reorganization of science specimen data, and data integration is the core of the reorganization. ETL [1] which is the abbreviation of extract, transform, and load [2], is very suitable for data integration. Kettle is a kind of ETL software. In this paper, it has been introduced into the integrated reorganization of science specimen data. Multi-source and heterogeneous specimen data are integrated using kettle, and good results have been achieved. It proved the effectiveness of kettle in the integrated reorganization of science specimen data. The application has practical significance, and the method can be referenced when reorganizing other resource data.
Protective Effects of Chinese Traditional Medicine Buyang Huanwu Decoction on Myocardial Injury
Guangde Yang,Zhiyuan Fang,Yu Liu,Hui Zhang,Xiaolian Shi,Qiaoli Ji,Qinqin Lin,Rong Lin
Evidence-Based Complementary and Alternative Medicine , 2011, DOI: 10.1093/ecam/nep013
Abstract: Many clinical studies have reported that Buyang Huanwu Decoction (BYHWD) has a protective effect on ischemic heart disease (IHD). In the present study, the protective effect of BYHWD on myocardial ischemia was investigated. Different doses of BYHWD and Compound Danshen Dropping Pills (CDDP) were lavaged to rats, respectively, isoproterenol (ISO) was intraperitoneally injected in to all animals to induce myocardial ischemia except the control group. Electrocardiogram (ECG) of each animal was recorded; activities of lactate dehydrogenase (LDH), creatine kinase (CK) and aspartate aminotransferase (AST) in serum were detected. As the results of ECG showed, pre-treatment with BYHWD inhibited ischemic myocardial injury, and the activities of LDH, CK and AST were lower than those in the myocardial ischemia model group, which suggests that BYHWD rescues the myocardium from ischemia status. To research the potential mechanism, the level of nitric oxide (NO), nitric oxide syntheses (NOS) and inducible nitric oxide syntheses (iNOS), the expression of iNOS and ligand of cluster of differentiation 40 (CD40L) were detected. The results revealed that BYHWD significantly decreased the level of NO, NOS and iNOS in serum. Moreover, BYHWD decreased the expression of iNOS and CD40L in myocardial tissues. These results indicate that the protective effect of BYHWD on myocardial ischemia and mechanism are associated with inhibition of iNOS and CD40L expression.
How Molecular Motors Are Arranged on a Cargo Is Important for Vesicular Transport
Robert P. Erickson ?,Zhiyuan Jia ?,Steven P. Gross ?,Clare C. Yu
PLOS Computational Biology , 2011, DOI: 10.1371/journal.pcbi.1002032
Abstract: The spatial organization of the cell depends upon intracellular trafficking of cargos hauled along microtubules and actin filaments by the molecular motor proteins kinesin, dynein, and myosin. Although much is known about how single motors function, there is significant evidence that cargos in vivo are carried by multiple motors. While some aspects of multiple motor function have received attention, how the cargo itself —and motor organization on the cargo—affects transport has not been considered. To address this, we have developed a three-dimensional Monte Carlo simulation of motors transporting a spherical cargo, subject to thermal fluctuations that produce both rotational and translational diffusion. We found that these fluctuations could exert a load on the motor(s), significantly decreasing the mean travel distance and velocity of large cargos, especially at large viscosities. In addition, the presence of the cargo could dramatically help the motor to bind productively to the microtubule: the relatively slow translational and rotational diffusion of moderately sized cargos gave the motors ample opportunity to bind to a microtubule before the motor/cargo ensemble diffuses out of range of that microtubule. For rapidly diffusing cargos, the probability of their binding to a microtubule was high if there were nearby microtubules that they could easily reach by translational diffusion. Our simulations found that one reason why motors may be approximately 100 nm long is to improve their ‘on’ rates when attached to comparably sized cargos. Finally, our results suggested that to efficiently regulate the number of active motors, motors should be clustered together rather than spread randomly over the surface of the cargo. While our simulation uses the specific parameters for kinesin, these effects result from generic properties of the motors, cargos, and filaments, so they should apply to other motors as well.
Different cDNA microarray patterns of gene expression reflecting changes during metastatic progression in adenoid cystic carcinoma
Dan Huang, Wantao Chen, Ronggen He, Fan Yu, Zhiyuan Zhang, Weiliu Qiu
World Journal of Surgical Oncology , 2003, DOI: 10.1186/1477-7819-1-28
Abstract: Salivary adenoid cystic carcinoma cell line and its high metastases adenoid cystic carcinoma clone were used as model systems to reveal the gene expression alteration related to metastasis mechanism by cDNA microarray analysis. The correlation of metastatic phenotypic changes and expression levels of 4 selected genes (encoding CD98, L6, RPL29, and TSH) were further validated by using RT-PCR analysis of human tumor specimens from primary adenoid cystic carcinoma and corresponding metastasis lymph nodes.Of the 7,675 clones of known genes and expressed sequence tags (ESTs) that were analyzed, 30 showed significantly different (minimum 3 fold) expression levels in two cell lines. Out of 30 genes found differentially expressed, 18 were up regulated (with ratio more than 3) and 12 down regulated (with ratio less than 1/3).Some of these genes are known to be involved in human tumor antigen, immune surveillance, adhesion, cell signaling pathway and growth control. It is suggested that the microarray in combination with a relevant analysis facilitates rapid and simultaneous identification of multiple genes of interests and in this study it provided a profound clue to screen candidate targets for early diagnosis and intervention.Adenoid cystic carcinoma (ACC) of the salivary gland is characterized by a prolonged clinical course, high rate of local recurrence and the delayed onset of distant hematogenous metastases. Late distant metastases and local recurrences are responsible for a rather low long-term survival rate and poor treatment results [1]. However, the molecular mechanism behind the metastasis development is poorly understood, largely because the tumor metastasis is a complex process involving several distinct steps such as escape from primary tumor, dissemination through the circulation, lodgment in small vessels at distinct sites, penetration of the vessel wall and growth in the new site as a secondary tumor [2]. A possible breakthrough in understanding of tumor met
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