Qingdao, China
Qingdao, China

The Ocean University of China , colloquially known as Haida is a university in Qingdao. As one of the key comprehensive universities of China, it is under the direct jurisdiction of the Ministry of Education. While offering studies in all major branches of technical and social science, the university is especially renowned for its marine science and fishery science departments. Wikipedia.


Time filter

Source Type

News Article | April 28, 2017
Site: www.materialstoday.com

Chinese researchers believe they’ve gotten a step closer to producing all-weather photovoltaics by integrating phosphors into solar cells Solar power is playing an ever-greater role in our energy landscape, and its efficiency continues to improve. However, to date, photovoltaic systems can still only produce power when the sun is in the sky. But a group of materials scientists in China say that they’ve found a way to help dye-sensitised solar cells work after dusk. All photovoltaic devices are based light absorption followed by charge separation. In most commercial devices, solid-state silicon manages both of these tasks, but in dye-sensitised solar cells (DSSCs), sometimes called Grätzel cells, the two tasks are separated. In their thin film structure, light is absorbed by a sensitizer electrolyte (a dye), with charge separation then occurring at the interface between the dye and a solid, mesoporous oxide layer. Into this structure, Qunwei Tang and his colleagues at the Ocean University of China propose adding long persistence phosphors, in order to utilise unabsorbed light in the cell. Writing in Nano Energy [DOI: 10.1016/j.nanoen.2017.01.047], they report on the integration of purple, blue, cyan, green, red and white-emitting phosphors into dye-sensitised solar cells with TiO photoanodes. The idea is that the phosphors act as storage materials within the cell – when illuminated by sunlight, they harvest energy from ultraviolet light, and then, once the light source is removed, they release persistent visible fluorescence at a different wavelength that can then be absorbed by the dye. And it appeared to work largely as predicted. The authors showed that when illuminated by a solar simulator, the standard DSSC displayed a cell efficiency of 8.08%, while the cell with a green phosphor reached 10.08%. In dark conditions, the voltage output of the standard cell rapidly dropped to zero. But the phosphor-enhanced cells continued to produce small voltages in the absence of light. Though all displayed a significant reduction in the first five minutes of darkness, five of them persisted, with the cyan cell producing 0.284 V one hour after the light source had been switched off. While still very much at the lab scale, this result poses further questions of current DSSC design. The same group recently reported on their development of a flexible cell that can be triggered by both rain and sun. Combined with this latest paper, they seem to be getting closer to their goal of making a truly all-weather photovoltaic. Q. Tang, J. Wang, B. He, P. Yang, “Can dye-sensitized solar cells generate electricity in the dark?” Nano Energy, Vol 33 (2017) 266–271. DOI: 10.1016/j.nanoen.2017.01.047


Zhang S.,Ocean University of China
Developmental and comparative immunology | Year: 2013

Both innate and adaptive immune-relevant factors are transferred from mother to offspring in fishes. These maternally-transferred factors include IgM, lysozymes, lectin, cathelicidin and complement components. Recently, yolk proteins, phosvitin and lipovitellin, have been shown to be maternally-transferred factors, functioning in the defense of teleost larvae against pathogens. Among these factors, the mode of action of complement components and yolk proteins has been explored, whereas that of all the other factors remains elusive. At present, the transfer mechanisms of maternally-derived immune factors are largely unknown although those of IgM and yolk protein transmission from mother to offspring have been reported in some fishes. Maternal transfer of immunity is affected by many elements, including biological factors, such as age and maturation, and environmental conditions experienced by brood fish, such as pathogens and nutritional supply. Practically, the manipulation of maternal immunity transfer can be used to enhance the survival rate of fish larvae. Copyright © 2012 Elsevier Ltd. All rights reserved.


Zhang Q.,Ocean University of China
Proceedings. Biological sciences / The Royal Society | Year: 2012

The ciliate subclass Haptoria is a diverse taxon that includes most of the free-living predators in the class Litostomatea. Phylogenetic study of this group was initially conducted using a single molecular marker small-subunit ribosomal RNA (SSU rRNA genes). Multi-gene analysis has been limited because very few other sequences were available. We performed phylogenetic analyses of Haptoria incorporating new SSU rRNA gene sequences from several debated members of the taxon, in particular, the first molecular data from Cyclotrichium. We also provided nine large-subunit ribosomal RNA (LSU rRNA) gene sequences and 10 alpha-tubulin sequences from diverse haptorians, and two possible relatives of controversial haptorians (Plagiopylea, Prostomatea). Phylogenies inferred from the different molecules showed the following: (i) Cyclotrichium and Paraspathidium were clearly separated from the haptorids and even from class Litostomatea, rejecting their high-level taxonomic assignments based on morphology. Both genera branch instead with the classes Plagiopylea, Prostomatea and Oligohymenophora. This raises the possibility that the well-known but phylogenetically problematic cyclotrichiids Mesodinium and Myrionecta may also have affinities here, rather than with litostomes; (ii) the transfer of Trachelotractus to Litostomatea is supported, especially by the analyses of SSU rRNA and LSU rRNA genes, however, Trachelotractus and Chaenea (more uncertainly) generally form the two deepest lineages within litostomes; and (iii) phylogenies of the new molecular markers are consistent with SSU rRNA gene information in recovering order Pleurostomatida as monophyletic. However, Pleurostomatida branches cladistically within order Haptorida, as does subclass Trichostomatia (on the basis of SSU rRNA phylogenies). Our results suggest that the class-level taxonomy of ciliates is still not resolved, and also that a systematic revision of litostomes is required, beginning at high taxonomic levels (taxa currently ranked as subclasses and orders).


Chen X.,Ocean University of China | Chen X.,University of Washington | Tung K.-K.,University of Washington
Science | Year: 2014

A vacillating global heat sink at intermediate ocean depths is associated with different climate regimes of surface warming under anthropogenic forcing: The latter part of the 20th century saw rapid global warming as more heat stayed near the surface. In the 21st century, surface warming slowed as more heat moved into deeper oceans. In situ and reanalyzed data are used to trace the pathways of ocean heat uptake. In addition to the shallow La Niña-like patterns in the Pacific that were the previous focus, we found that the slowdown is mainly caused by heat transported to deeper layers in the Atlantic and the Southern oceans, initiated by a recurrent salinity anomaly in the subpolar North Atlantic. Cooling periods associated with the latter deeper heat-sequestration mechanism historically lasted 20 to 35 years.


Grant
Agency: GTR | Branch: EPSRC | Program: | Phase: Research Grant | Award Amount: 185.70K | Year: 2014

Tidal turbines (akin to underwater wind turbines) are at a stage of development where full-scale prototype devices have been deployed and tested in the seas surrounding the UK and other locations in the world. The next step is to deploy farms or arrays of multiple devices to demonstrate operability, cost reduction and the ability to generate electricity at a larger scale. In order to do this device developers and funders of the technology must have confidence and assurances that these arrays of tidal turbines will perform as predicted; but how do you predict something that you have never done before? Computer-based numerical models can simulate things before they are constructed or installed but without data to validate these models how can anyone know if they will be accurate? This project addresses such a question How can we aid industry to best validate dynamic (real time) array models for:(a) optimised array design and layout, (b) prediction of dynamic loadings and fatigue effects (rotors and blades) through inflow turbulence and device-device interactions and (c) reliability or planning for O&M considering the lack of publically-available data? Our answer is to: 1. To provide real, time -series data of loadings and power performance experienced by tidal turbines under realistic inflow conditions and when devices interact with one another (in array type configurations). At present there is little if any data on this (mostly average values or short time-scale experimental runs) which cannot sufficiently validate models. We will provide scale test data with all parameters required to use data sets for validation purposes 2. To provide measured time-series data for larger multiple-row arrays than has been previously conducted 3. To quantify so-called steady loads and measure changes in performance over time through long-term testing of a scale device(s) in the sea And to make project data available directly to relevant marine energy stakeholders in a very timely manner


A selective breeding method of a new strain of Crassostrea gigas with orange left and right shells, comprising the following steps: selecting individuals of C. gigas with purple left shell and black mantle as the male broodstocks and individuals of C. gigas with black left shell and black mantle as the female broodstocks from cultured populations to generate a F1 family by applying single-pair mating strategy; selecting individuals with black purple left and right shells and black mantle from the F1 family as broodstocks to generate F2 families through family selection; selecting individuals with black purple left and right shells and black mantle from the F2 families as broodstocks to generate F3 families through family selection; selecting individuals with orange left and right shells from the F3 families as broodstocks to propagate to generate a new strain of C. gigas with the stably inherited trait of orange left and right shells. The new color trait of C. gigas improves the additional value of oyster products. It has been proven that there is a promising market for this new strain of C. gigas.


The invention relates to an oxygen and nitrogen co-doped polyacrylonitrile-based carbon fiber and a preparation method thereof. The oxygen and nitrogen co-doped polyacrylonitrile-based carbon fiber is prepared by electrochemical modification of a raw-material polyacrylonitrile-based carbon fiber, such that the surface thereof has an active layer formed by oxygen-containing active functional groups and nitrogen-containing active functional groups, wherein the nitrogen-containing active functional groups are obtained by activation of the doped nitrogen inherently contained in the raw-material polyacrylonitrile-based carbon fiber by means of electrochemical modification. The method for preparing the oxygen and nitrogen co-doped polyacrylonitrile-based carbon fiber comprises the following steps: placing the raw-material polyacrylonitrile-based carbon fiber in an electrolyte solution, subjecting it to cyclic treatment between electrochemical oxidation and electrochemical reduction, and thus obtaining the oxygen and nitrogen co-doped polyacrylonitrile-based carbon fiber. The oxygen and nitrogen co-doped polyacrylonitrile-based carbon fiber of the present invention has both the pseudo-capacitive properties for oxidation-reduction reactions and electrocatalytic properties for the cathodic oxygen reduction reaction.


The method for the measurement of turbulence by using reciprocating ocean microstructure profiler includes the following procedures: 1) system startup; 2) detection of the profile data of ocean dynamic environment information: a. temperature detection; b. shear detection; c. depth detection; and d. current and temperature & conductivity detection; e. gesture sensing; 3) control of ascending and descending operations of the profiler: a. uprising control; b. redirection operation; and c. sinking control; and 4) sleep mode. The method doesnt consume labor several times and the equipment is capable of providing long-time continuous profile measurement at a fixed area along a steel cable; and the entire system can ascend and descend steadily after hydrodynamic optimized layout, eliminating the measurement errors contributable to water flow fluctuation during detection, thus obtaining accurate ocean microstructure observation in vertical with higher precision.


Patent
Ocean University of China | Date: 2015-09-11

An along-the-cable reciprocating motion control mechanism includes a moving platform, weight drop-off gear, weight release gear and trigger gear. The moving platform is set at a guide cable and can make reciprocating motion along the guide cable. A profiler is carried by the moving platform and the buoyancy of the moving platform carrying the profiler is greater than zero, the weight drop-off gear is set at the top of the guide cable and can drop a weight onto the moving platform within a predefined period, the weight release gear is provided on the moving platform, the trigger gear is set at the bottom of the guide cable, and when the moving platform carries a weight and descends to the bottom of the guide cable, the trigger gear touches the weight release gear to enable it to make a series of actions.


Patent
Ocean University of China | Date: 2015-09-11

A method includes: a guide cable and an observation platform is provided, a profiler is mounted, and a trigger gear is set at the bottom of the guide cable; a weight drop-off gear is set at the top of the guide cable, when the observation platform is located at the top of the guide cable, one weight is released by the weight drop-off gear onto the observation platform so that the observation platform descends along the guide cable owing to additional gravity, and when the observation platform descends to the given position of the trigger gear at the bottom of the guide cable, the release gear releases the weight on the observation platform so that the observation platform returns by its own buoyancy to the top along the guide cable; another weight is subsequently released by the weight drop-off gear so that the observation platform repeats the foregoing reciprocating motion.

Loading Ocean University of China collaborators
Loading Ocean University of China collaborators