312 research outputs found
2-methylimidazole-derived Ni-Co layered double hydroxide nanosheets as high rate capability and high energy density storage material in hybrid supercapacitors
No full textA new method based on one-step solvothermal reaction is demonstrated to synthesize ultrathin Ni-Co layered double hydroxide (LDH) nanosheets, which grow directly on a flexible carbon fiber cloth (NiCo-LDH/CFC). Through using 2-methylimidazole as complex and methanol as solvent, the as-prepared NiCo-LDH/CFC shows a (003) facet preferential growth and an expanded interlayer spacing structure, resulting in a unique 3D porous nanostructure with a thickness of nanosheets of around 5-7 nm that shows high energy storage performance. By controlling the ratio of Ni/Co = 4:1 in the precursor solution, the electrode shows a specific capacitance of 2762.7 F g (1243.2 C g) at a current density of 1 A g. Nevertheless, the optimal composition is obtained with Ni/Co = 1:1, which produces a specific capacitance of 2242.9 F g (1009.3 C g) at 1 A g and shows an excellent rate capability with 61% of the original capacitance being retained at a current density of 60 A g. The hybrid supercapacitor (HSC) based on the NiCo-LDH/CFC exhibits a maximum energy density of 59.2 Wh kg and power densities of 34 kW kg, respectively. Long-term stability test shows that 82% of the original capacitance of the HSC remains after 5000 cycles. Importantly, the electrochemical performance of the solid-state flexible supercapacitors based on the prepared NiCo-LDH/CFC electrode showed a negligible change when the device was bent up to 180°. The performance of synthesized NiCo-LDH/CFC indicates the great potential of the material for delivering both high energy density and high power density in energy storage devices
Impact of Glutamine-Enhanced Parenteral Nutrition on Postoperative Outcomes in Colorectal Cancer Patients
No full textYong Huang,* Chunmei Yin,* Jue Wang, Maijian Wang, Xingbin Zheng, Ming Xie, Jiwei Wang Department of General Surgery, Digestive Disease Hospital, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, People’s Republic of China*These authors contributed equally to this workCorrespondence: Jiwei Wang, Department of General Surgery, Digestive Disease Hospital, Affiliated Hospital of Zunyi Medical University, 149 Dalian Road, Huichuan District, Zunyi, Guizhou, People’s Republic of China, Tel +86-13017410630, Email [email protected]: This study investigated the effects of parenteral glutamine (Gln) supplement immunonutrition versus conventional nutritional support on postoperative Clavien–Dindo classification complications and recovery, perioperative nutritional status, and immune, inflammation, and safety indicators in patients with colorectal cancer (CRC).Patients and Methods: Clinical data were collected for a retrospective cohort study of 178 patients (58 and 120 patients in the observation and control groups, respectively) who underwent radical resection of CRC from January 2019 to December 2021. The incidence of postoperative complications was calculated. Postoperative recovery, nutritional indicators, inflammatory factors indicator, and the safety indicators before operation and at 1, 3, and 7 days after operation were compared. SPSS 29.0 statistical software was used for statistical analysis.Results: The incidence of postoperative overall complications in the control group and the observation group was 22.50% (27/120) and 17.24% (10/58), respectively, and there was no significant difference between the two groups (P=0.42). The incidence of postoperative complications of Clavien-Dindo grade ≥III in the control group and the observation group was 14.17% (17/120) and 3.45% (2/58), respectively, and the difference between the two groups was statistically significant (P=0.03). Secondary outcomes (first exhaust, defecation, and liquid diet intake times) were significantly recovered earlier in the observation group than those in the control group (P 0.05), although significant differences were observed in several inflammatory and safety indicators(P< 0.05).Conclusion: Unlike conventional nutritional support, postoperative parenteral Gln supplementation reduced the incidence of postoperative Clavien–Dindo complications grade ≥III in patients with CRC while increasing intestinal and immune functions, decreasing inflammation, and reducing the length of hospital stay.Keywords: glutamine, parenteral nutrition, colorectal cancer, clavien–dindo complicatio
Genomic Meta-Analysis Combining Microarray Studies with Confounding Clinical Variables: Application to Depression Analysis
No full textMajor depressive disorder (MDD) is a heterogeneous psychiatric illness with mostly un-characterized pathology and is the fourth most common cause of disability according to the World Health Organization (WHO) and has a significant impact on public health in the United States. To understand the genetics of MDD, we aim to develop effective meta-analysis approaches to provide high-quality characterization of MDD related biomarkers and pathways with proper clinical variable adjustment. First, genomic meta-analysis in MDD faces multiple unique difficulties, such as weak expression signal of MDD, substantial clinical heterogeneity and small sample size. Given these obstacles, it is hard to identify consistent and robust biomarkers in an individual study. To achieve a more accurate and robust detection of differentially expressed (DE) genes and pathways associated with MDD, we proposed a statistical framework of meta-analysis for adjusting confounding variables (MetaACV). The result showed that more MDD related biomarkers and pathways were detected that greatly enhanced understanding of MDD neurobiology. Secondly, Meta-analysis has become popular in the biomedical research because it generally can increase statistical power and provide validated conclusions. However, its result is often biased due to the heterogeneity. Meta-regression has been a useful tool for exploring the source of heterogeneity among studies in a meta-analysis. In this dissertation, we will explore the use of meta-regression in microarray meta-analysis. To account for heterogeneities introduced by study-specific features such as sex, brain region and array platform in the meta-analysis of major depressive disorder (MDD) microarray studies, we extended the random effects model (REM) for genomic meta-regression, combining eight MDD microarray studies. The result shows increased statistical power to detect gender-dependent and brain-region-dependent biomarkers that traditional meta-analysis methods cannot detect. The identified gender-dependent markers have provided new biological insights as to why females are more susceptible to MDD and the result may lead to novel therapeutic targets. Finally, we present an open-source R package called Meta-analysis for Differential Expression analysis (MetaDE) which provides 12 commonly used methods of meta-analysis. It is a friendly used software such that biologists implement meta-analysis in their research
The 2nd International Conference on Water Resource and Environment (WRE 2016)
No full textTable of contents 01 The eco-toxicological effects of cadmium stress on five ornamental plants Zhouli Liu, Wei Chen, Xingyuan He, Shuai Yu, Weihang Ding 02 Study on the formation and release mechanisms of hydrogen sulfide in Longtan coal mine Jianjun Liu, Yuliang Wu, Kaixiang Fan 03 Coral bleaching in the North Reef of China’s Xisha Islands in 2014 Yuanchao Li, Xinqing Zheng, Shiquan Chen, Haiqun Xie 04 Soil chemical characteristics in a Cunninghamia lanceolata stand suffering from ice-snow damage Jie Li, Zhuomin Wang, Li Xue 05 Diversity of understory vegetation was under a Cunninghamia lanceolata stand suffering from ice-snow damage Zhiyang Lie, Weilong Huang, Tongtong Zhou, Li Xue 06 The effect of water, nitrogen and harvesting time on yield and biomass allocation of Helianthus tuberosus L. Kai Gao, Tiexia Zhu 07 The vertical variation of microbial communities in the sediment of sea cucumber pond Weiteng Mao, Pei Yu, Xinfang Lv, Yunchun Li 08 Indicating significances of alpine plant functional groups to environmental change Peixi Su, Rui Shi 09 Research on the daily CH4 fluxes of soil in summer mangrove community at Yingluogang of Guangxi, China Yong Jiang, Xingbin Chen, Shichu liang 10 Beach protection structures in middle and lower reaches of Yangtze River Junfeng Xu 11 Social responsibility management of large dam project with owner as core: an empirical case in China Jiwei Zhu, Zhao Zhai, Linan Zhou, Yun Le, Li Cao 12 The ecological function value assessment analysis of urban waterfront Jiwei Zhu, Ping Lu, Zhiqian Huang, Bei Zhou 13 Mechanism of diurnal osmotic potential changes and adjustment of three Caragana species in different habitats of the Inner Mongolia Plateau Zhirong Zheng, Shihai Lv, Chaoyang Feng 14 Biodiversity of phytoplankton and environmental influences analysis of Longfeng Wetland, China Nan Song, Yan Liu, Xinxin Lu, Yawen Fan 15 The effect of human activities on culturable soil microbes from Yaoquan Mountain in Wudalianchi, China Jianfei Guan, Jihua Wang, Xueping Zhan
Blow-up behavior of ground states of semilinear elliptic equations in Rn involving critical Sobolev exponents
No full textPerformance analysis of joint relay selection and transmission schemes in multiple-antenna two-way relay systems
No full textIn this paper, we consider a two-way relay system with two multi-antenna sources and multiple single-antenna relays and study the performances for various transmission schemes with the assumption that perfect channel state information (CSI) is available at both the sources and the relays. Although a transmission scheme that combines source beamforming and relay selection (BF-RS) is known to improve a system performance, its performance has not been theoretically analyzed yet. In the paper, we focus on the performance analysis in terms of the symbol error probability (SEP) for the BF-RS scheme. The analytical upper and lower bounds of the end-to-end system SEP are derived in the closed form, and the asymptotic SEP expression is given in high SNR regime. By both analytical and simulation results, it is clearly shown that a full transmit and relay selection diversity gain can be achieved without code rate loss. The SEP curves from simulations show that our derived bounds can predict the performance accurately. Based on the derived analytical results, we propose an individual power allocation (IPA) scheme to save the total transmit power. We show that the IPA scheme can result in considerable energy saving with a comparable SEP performance.National Science Foundation of China (NSFC) [61471008]; Specialized Research Fund for the Doctoral Program of the Ministry of Education of China [20120001120125]; National Natural Science Foundation of Beijing [4144075]SCI(E)[email protected]
Molecular Heterojunctions of Oligo(phenylene ethynylene)s with Linear to Cruciform Framework
No full textElectrical transport properties of molecular junctions are fundamentally affected by the energy alignment between molecular frontier orbitals (highest occupied molecular orbital (HOMO) or lowest unoccupied molecular orbital (LUMO)) and Fermi level (or work function) of electrode metals. Dithiafulvene (DTF) is used as substituent group to the oligo(phenylene ethynylene) (OPE) molecular wires and different molecular structures based on OPE3 backbone (with linear to cruciform framework) are achieved, with viable molecular orbitals and HOMO-LUMO energy gaps. OPE3, OPE3-DTF, and OPE3-tetrathiafulvalene (TTF) can form good self-assembled monolayers (SAMs) on Au substrates. Molecular heterojunctions based on these SAMs are investigated using conducting probe-atomic force microscopy with different tips (Ag, Au, and Pt) and Fermi levels. The calibrated conductance values follow the sequence OPE3-TTF > OPE3-DTF > OPE3 irrespective of the tip metal. Rectification properties (or diode behavior) are observed in case of the Ag tip for which the work function is furthest from the HOMO levels of the OPE3s. Quantum chemical calculations of the transmission qualitatively agree with the experimental data and reproduce the substituent effect of DTF. Zero-bias conductance, and symmetric or asymmetric couplings to the electrodes are investigated. The results indicate that improved fidelity of molecular transport measurements may be achieved by systematic studies of homologues series of molecular wires applying several different metal electrodes.</p
Channel congestion performance analysis for DSRC vehicle ad hoc network
No full textIn this paper, the analytic model for single class broadcast based frame transmission by IEEE 802.11 MAC is presented. A Markov chain is used to derive a transmission probability that a station may transmit a frame in a random time slot. The collision probability is calculated based on the transmission probability. After that the per-node throughput is calculated based on the stationary transmission probabilities. With the proposed analytic model, we studied the network QoS performances in terms of message success probability, network throughput and channel access delay for both emerging and routine messages. The proposed analytic model was verified by simulations, which shows very high accuracy. ? 2015 IEEE.EI600-60
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