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Search Results: 1 - 10 of 46773 matches for " Jian Han "
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Response to “Discussion on the systematic position of the early cambrian priapulomorph worms”
Response to“Discussion on the systematic position of the Early Cambrian priapulomorph worms”

HAN Jian,
HAN
,Jian,HU,Shixue

科学通报(英文版) , 2006,
Abstract: Due to the combination of complex states of preser- vation and taphonomies in Chengjiang fossils, Huang et al.1] expressed different opinions to those of Han et al.2] on the morphology and systematic position of the fossil priapulomorph worms (Priapulom…
Response to “Discussion on the systematic position of the early cambrian priapulomorph worms”
Jian Han,Shixue Hu
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-005-0013-4
Abstract:
Formation of hypereutectic silicon particles in hypoeutectic Al-Si alloys under the influence of high-intensity ultrasonic vibration
Xiaogang Jian,Qingyou Han
China Foundry , 2013,
Abstract: The modification of eutectic silicon is of general interest since fine eutectic silicon along with fine primary aluminum grains improves mechanical properties and ductilities. In this study, high intensity ultrasonic vibration was used to modify the complex microstructure of aluminum hypoeutectic alloys. The ultrasonic vibrator was placed at the bottom of a copper mold with molten aluminum. Hypoeutectic Al-Si alloy specimens with a unique in-depth profile of microstructure distribution were obtained. Polyhedral silicon particles, which should form in a hypereutectic alloy, were obtained in a hypoeutectic Al-Si alloy near the ultrasonic radiator where the silicon concentration was higher than the eutectic composition. The formation of hypereutectic silicon near the radiator surface indicates that high-intensity ultrasonic vibration can be used to influence the phase transformation process of metals and alloys. The size and morphology of both the silicon phase and the aluminum phase varies with increasing distance from the ultrasonic probe/radiator. Silicon morphology develops into three zones. Polyhedral primary silicon particles present in zone I, within 15 mm from the ultrasonic probe/radiator. Transition from hypereutectic silicon to eutectic silicon occurs in zone II about 15 to 20 祄 from the ultrasonic probe/radiator. The bulk of the ingot is in zone III and is hypoeutectic Al-Si alloy containing fine lamellar and fibrous eutectic silicon. The grain size is about 15 to 25 祄 in zone I, 25 to 35 祄 in zone II, and 25 to 55 祄 in zone III. The morphology of the primary ?Al phase is also changed from dendritic (in untreated samples) to globular. Phase evolution during the solidification process of the alloy subjected to ultrasonic vibration is described.
On the $\ell_1-\ell_q$ Regularized Regression
Han Liu,Jian Zhang
Mathematics , 2008,
Abstract: In this paper we consider the problem of grouped variable selection in high-dimensional regression using $\ell_1-\ell_q$ regularization ($1\leq q \leq \infty$), which can be viewed as a natural generalization of the $\ell_1-\ell_2$ regularization (the group Lasso). The key condition is that the dimensionality $p_n$ can increase much faster than the sample size $n$, i.e. $p_n \gg n$ (in our case $p_n$ is the number of groups), but the number of relevant groups is small. The main conclusion is that many good properties from $\ell_1-$regularization (Lasso) naturally carry on to the $\ell_1-\ell_q$ cases ($1 \leq q \leq \infty$), even if the number of variables within each group also increases with the sample size. With fixed design, we show that the whole family of estimators are both estimation consistent and variable selection consistent under different conditions. We also show the persistency result with random design under a much weaker condition. These results provide a unified treatment for the whole family of estimators ranging from $q=1$ (Lasso) to $q=\infty$ (iCAP), with $q=2$ (group Lasso)as a special case. When there is no group structure available, all the analysis reduces to the current results of the Lasso estimator ($q=1$).
Extensions of the I-MMSE Relation
Guangyue Han,Jian Song
Mathematics , 2015,
Abstract: Unveiling a fundamental link between information theory and estimation theory, the I-MMSE relation by Guo, Shamai and Verdu~\cite{gu05}, together with its numerous extensions, has great theoretical significance and various practical applications. On the other hand, its influences to date have been restricted to channels without feedback or memory, due to the absence of its extensions to such channels. In this paper, we propose extensions of the I-MMSE relation to discrete-time and continuous-time Gaussian channels with feedback and/or memory. Our approach is based on a very simple observation, which can be applied to other scenarios, such as a simple and direct proof of the classical de Bruijn's identity.
Extensions of the I-MMSE Relation
Guangyue Han,Jian Song
Computer Science , 2014,
Abstract: Unveiling a fundamental link between information theory and estimation theory, the I-MMSE relation by Guo, Shamai and Verdu has great theoretical significance and numerous practical applications. On the other hand, its influences to date have been restricted to channels without feedback and memory, due to the lack of extensions of the I-MMSE relation to such channels. In this paper, we propose extensions of the I-MMSE relation for discrete and continuous-time Gaussian channels with feedback or memory. Our approach is based on a very simple observation, which can be applied to other scenarios, such as a simple and direct proof of the classical de Bruijn's identity.
Reconstruction of Sugar Metabolic Pathways of Giardia lamblia
Jian Han,Lesley J. Collins
International Journal of Proteomics , 2012, DOI: 10.1155/2012/980829
Abstract: Giardia lamblia is an “important” pathogen of humans, but as a diplomonad excavate it is evolutionarily distant from other eukaryotes and relatively little is known about its core metabolic pathways. KEGG, the widely referenced site for providing information of metabolism, does not yet include many enzymes from Giardia species. Here we identify Giardia’s core sugar metabolism using standard bioinformatic approaches. By comparing Giardia proteomes with known enzymes from other species, we have identified enzymes in the glycolysis pathway, as well as some enzymes involved in the TCA cycle and oxidative phosphorylation. However, the majority of enzymes from the latter two pathways were not identifiable, indicating the likely absence of these functionalities. We have also found enzymes from the Giardia glycolysis pathway that appear more similar to those from bacteria. Because these enzymes are different from those found in mammals, the host organisms for Giardia, we raise the possibility that these bacteria-like enzymes could be novel drug targets for treating Giardia infections. 1. Introduction Giardia lamblia is a major cause of human waterborne diarrheal disease, infecting an estimated 10% of the world’s population during their lifetime [1]. Infection is by fecal-oral transmission and is initiated by ingestion of infectious cysts in contaminated water or through person-to-person contact. After excystation, flagellated trophozoites colonize the upper small intestine where they attach to the epithelial lining but do not invade the mucosa. Around 50% of Giardia infections are asymptomatic, in others the major symptoms of Giardia infection include diarrhea, with malabsorption, dehydration, weight loss, cognitive impairment in children, and chronic fatigue in adults as well as other symptoms [2]. One of the main drugs for treating Giardia infection is metronidazole (Mz) [3, 4]. However, Mz treatment fails in about 20% of patients [5] and there are other issues including developing resistance from Giardia [2]; moreover, Mz is inactive against Giardia cysts [6]. The discovery and development of new therapeutics are important to expand the arsenal for controlling parasitic infection. Typically a drug target is a key molecule involved in a metabolic or signalling pathway that is specific to a disease condition or pathology, or to the infectivity or survival of a microbial pathogen [7]. Since Giardia is a parasite with limited metabolic diversity, a better understanding of its metabolic pathways is important to the discovery of new drug targets. Although it has
Wavelet Cross-Spectrum Analysis of Multi-Scale Disturbance Instability and Transition on Sharp Cone Hypersonic Boundary Layer

HAN Jian,JIANG Nan,

中国物理快报 , 2008,
Abstract: Experimental measurement of hypersonic boundary layer stability and transition on a sharp cone with a half angle of 5° is carried out at free-coming stream Mach number 6 in a hypersonic wind tunnel. Mean andfluctuation surface-thermal-flux characteristics of the hypersonic boundary layer flow are measured by Pt-thin-film thermocouple temperature sensors installed at 28 stations on the cone surface along longitudinal direction. At hypersonic speeds, the dominant flow instabilities demonstrate that the growth rate of the second mode tends to exceed that of the low-frequency mode. Wavelet-based cross-spectrum technique is introduced to obtain the multi-scale cross-spectral characteristics of the fluctuating signals in thefrequency range of the second mode. Nonlinear interactions both of the second mode disturbance and the first mode disturbance are demonstrated to be dominant instabilities in the initial stage of laminar-turbulence transition for hypersonic shear flow.
A Hypothesis: Supplementation with Mushroom-Derived Active Compound Modulates Immunity and Increases Survival in Response to Influenza Virus (H1N1) Infection
Han Chunchao,Jian-you Guo
Evidence-Based Complementary and Alternative Medicine , 2011, DOI: 10.1093/ecam/neq037
Abstract: We hypothesize that the mushroom-derived active compound may be a potential strategy for increasing survival in response to influenza virus (H1N1) infection through the stimulation of host innate immune response. The validity of the hypothesis can be tested by immune response to influenza infection as seen through survival percentage, virus clearance, weight loss, natural killer cell cytotoxicity, Tumor Necrosis Factor-α (TNF-α) and Interferon-gamma (IFN-γ) levels, lytic efficiency in the spleens of mice and inducible nitric oxide synthase mRNA expressions in RAW 264.7 murine macrophage cells. The hypothesis may improve people's quality of life, reduce the medical cost of our healthcare system and eliminate people's fears of influenza outbreak.
STUDIES ON THE MYCELIAL BIOMASS AND STARCH DEGRADATION OF FOUR DIFFERENT MORCHELLA SPECIES IN SOLID FERMENTATION
四种羊肚菌在固体发酵条件下的菌丝生物量和降解淀粉作用

HAN Jian,rong,
韩建荣

菌物学报 , 1998,
Abstract: 本文对4种羊肚菌在固体发酵条件下的菌丝生物量和降解淀粉作用进行了研究,结果表明:羊肚菌(Morchella esculenta)、尖顶羊肚菌(M conica)、黑脉羊肚菌(M angusticeps)和皱柄羊肚菌(M. crassipes)在玉米粉培养基或马铃薯粉培养基上进行固体发酵时,菌丝生物量之间无显著差异;但a-淀粉酶活力、淀粉降解率差异显著。4种羊肚菌中,尖顶羊肚菌的降解淀粉能力最强。在培养基中添加Ca2+和氮源以及将发酵时间从15天延长到25天均能显著提高羊肚菌的菌丝生物量、a-淀粉酶活力和淀粉降解率。在添加10%黄豆粉、0.1%Ca(Cl)225℃发酵25天的玉米粉和马铃薯粉的发酵产物中,尖顶羊肚菌对玉米淀粉的降解率可达到74.2%,对马铃薯淀粉的降解率可达到79.8%。
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