1,139 research outputs found
Zinc-anode reversibility and capacity inflection as an evaluation criterion
No full textZhuoxi Wu is currently a PhD student at the Department of Materials Science and Engineering in City University of Hong Kong, under the supervision of Professor Chunyi Zhi. His current research mainly focuses on zinc-anode reversibility improvement and electrolyte modification of zinc-ion battery. Yu Wang is a postdoc in the Department of Materials Science and Engineering at City University of Hong Kong in Professor Chunyi Zhi's group. Her current research mainly focuses on advanced aqueous zinc-ion batteries and the design of advanced metallic anodes. Dr. Wang obtained her bachelor's and master's degree in chemistry from Harbin Institute of Technology in 2012 and 2014. She obtained her PhD from the Chinese University of Hong Kong and mainly focuses on Li-air and aqueous Li-ion batteries. Chunyi Zhi obtained a PhD in condensed matter physics from the Institute of Physics, Chinese Academy of Sciences. After 2 years of being a postdoc at the National Institute for Materials Science (NIMS) in Japan, he was promoted to ICYS researcher, researcher (faculty), and senior researcher (permanent position) in NIMS. Dr. Zhi is now a chair professor at Department of Materials Science and Engineering in City University of Hong Kong. Dr. Zhi has extensive experience in aqueous electrolyte batteries and zinc ion batteries.link_to_subscribed_fulltex
sj-pdf-1-smm-10.1177_09622802221115881 - Supplemental material for Testing latent class of subjects with structural zeros in negative binomial models with applications to gut microbiome data
No full textSupplemental material, sj-pdf-1-smm-10.1177_09622802221115881 for Testing latent class of subjects with structural zeros in negative binomial models with applications to gut microbiome data by Peng Ye, Xinhui Qiao, Wan Tang, Chunyi Wang and Hua He in Statistical Methods in Medical Research</p
Ultraviolet electroluminescence from hybrid inorganic/organic ZnO/GaN/poly (3-hexylthiophene) dual heterojunctions
No full textAn Energy Efficiency Perspective on Rate Adaptation for 802.11n NIC
No full textRate adaptation (RA) has been traditionally used to achieve high goodput. In this work, we design RA for 802.11n NICs from an energy-efficiency perspective. We show that current MIMO RA algorithms are not energy efficient for NICs despite ensuring high throughput. The fundamental problem is that, the high-throughput setting is not equivalent to the energy-efficient one. Marginal throughput gain may be realized at high energy cost. We then propose EERA and EERA+, two energy-based RA schemes that trade off goodput for energy savings at NICs. EERA applies multidimensional ternary search and simultaneous pruning to speed up its runtime convergence in single-client operations, and uses fair airtime sharing to handle multiple-client operations. EERA+ further searches for multiple, staged rates to yield more energy savings over EERA. Our experiments have confirmed their effectiveness in various scenarios.SCI(E)[email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]
Weak morphology dependent valence band structure of boron nitride
No full textWe report a hard X-ray photoelectron spectroscopy (HX-PES) investigation on valence band structure of Boron Nitrides (BN) having different morphologies, including nanosheets, nanotubes, and micro-sized particles. Very weak morphology/valence band structure dependence was observed. For each case, the B-N π-band overlapping with σ-band between 0 to -12.5 eV and the s-band below -15 eV were identified. No obvious morphology-induced band shifts and intensity variations were observed. First-principles calculations based on density functional theory were performed and the results were compared with the experimental data. This theoretical analysis well explains the weak morphology dependent valence band spectra of BN nanomaterials obtained during HX-PES measurements. © 2013 AIP Publishing LLC.link_to_subscribed_fulltex
Cobalt(ii,iii) oxide hollow structures: fabrication, properties and applications
No full textHollow structured semiconductor oxide materials have been paid more and more attention due to their potential applications in many areas. Cobalt(ii,iii) oxide (Co3O4) is an important semiconductor oxide and its synthesis and properties have been of growing interest owing to prominent applications in several fields. This article provides a comprehensive review of the state-of-the-art research activities that concentrate on the rational synthesis, novel properties and unique applications of Co3O 4 hollow structures in nanotechnology. It begins with the rational design and fabrication of such structures, and then highlights a range of their unique properties and applications (e.g. magnetic, catalytic and superhydrophobic properties, lithium-ion batteries, supercapacitors, water treatment, gas sensing). Finally, the feature article is concluded with the authors' outlook of the perspectives with respect to future research on Co 3O4 hollow structures. © The Royal Society of Chemistry 2012.link_to_subscribed_fulltex
Boron Nitride Nanosheets: novel Syntheses and Applications in polymeric Composites
No full textAbstract. Two-dimensional (2D) boron nitride (BN) nanosheets, the rising material stars, have\ud
unique properties and amazing functionalities. The concise history of diverse synthesis routes\ud
of BN nanosheets is briefly summarized here; and the recent development towards mass\ud
production of BN nanosheets, i.e. “chemical blowing” technique relying on blowing molten\ud
polymer precursors into large polymeric bubbles and subsequent annealing into BN\ud
bubbles/nanosheets, is focused on. The abundant BN nanosheets enable their applications,\ud
especially in the representative polymeric composites with BN nanosheet additives, as\ud
particularly highlighted in this review. The highly thermoconductive insulating BN-filled\ud
composites are thus envisaged as high-performance packaging materials for electrical circuits
Ultrathin nanoporous Fe3O4–carbon nanosheets with enhanced supercapacitor performance
No full textUltrathin nanoporous Fe3O4-carbon nanosheets (NNSs) with a high surface area of 229 m2 g-1 were synthesized by using a two-step method. The high capacitance of 163.4 F g-1 was achieved by utilizing such NNSs electrodes due to their unique feature, which is much higher than those of previously reported Fe3O4 hybrid products. The interconnected porous framework surface greatly enhanced charge transfer due to larger interfaces, and carbon nanopillars between nanosheet layers brought high conductivity. © The Royal Society of Chemistry 2013.link_to_subscribed_fulltex
BN nanospheres as CpG ODN carriers for activation of toll-like receptor 9
No full textFor the first time, we demonstrated BN nanospheres (BNNSs) can interact with biomolecules and deliver unmethylated cytosine-phosphate-guanine oligodeoxynucleotides (CpG ODNs) into cells to activate toll-like receptor 9 (TLR9), which is a very important process for therapy of cancers and allergy diseases
Effects of sevoflurane versus propofol on cerebrovascular reactivity to carbon dioxide during laparoscopic surgery
No full textChunyi Wang,1,* Cheng Ni,1,* Gang Li,1 Yan Li,1 Liyuan Tao,2 Nan Li,2 Jun Wang,1 Xiangyang Guo1 1Department of Anesthesiology, 2Research Center of Clinical Epidemiology, Peking University Third Hospital, Beijing, China *These authors contributed equally to this work Purpose: Cerebrovascular reactivity to carbon dioxide (CVR-CO2) reflects cerebrovascular reserve capacity, which is important in many brain disorders, including cerebrovascular and Alzheimer’s diseases. Meanwhile, there is a relationship between CVR-CO2 and cognitive function. Therefore, the study is aimed at investigating the effects of sevoflurane versus propofol on CVR-CO2 during laparoscopic surgery, as well as the role of CVR-CO2 on cognitive function during perioperative period.Patients and methods: Eighty-eight patients, aged 18–65 years undergoing elective laparoscopic cholecystectomy, were randomly assigned to group S and group P. The patients in group S were induced with propofol and maintained with sevoflurane. The patients in group P were induced and maintained with propofol (target-controlled infusion). Remifentanil was given to both groups. CVR-CO2 at baseline (before induction), before pneumoperitoneum and during pneumoperitoneum, as well as Mini-Mental State Examination scores at baseline and 24 hours after surgery were recorded.Results: In group S, CVR-CO2 before and during pneumoperitoneum increased significantly compared with baseline (P<0.05). In group P, CVR-CO2 before pneumoperitoneum increased significantly (P<0.05), but CVR-CO2 during pneumoperitoneum was not different compared with baseline. In either group, there was no significant correlation between mean blood pressure and CVR-CO2 during surgery, and there was no significant difference between Mini-Mental State Examination scores at baseline and 24 hours after surgery.Conclusion: Sevoflurane could maintain CVR-CO2 at a higher level during pneumoperitoneum in surgery. Therefore, in patients with impaired cerebrovascular reserve capacity, inhaled anesthetic could be a priority strategy for anesthesia maintenance to improve the compensatory vasodilation ability of cerebral small vessels. Keywords: cerebrovascular reactivity to carbon dioxide, sevoflurane, propofol, pneumoperitoneum, Mini-Mental State Examination scor
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