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| 1 | Progress of marine biofouling and antifouling technologies显示文摘Adhesion of marine fouling organisms on artificial surfaces such as ship hulls causes many problems, including extra energy consumption, high maintenance costs, and increased corrosion. Therefore, marine antifouling is an important issue. In this review, physical and biochemical developments in the field of marine biofouling, which involves biofilm formation and macro-organism settlement, are discussed. The major antifouling technologies based on traditional chemical methods, biological methods, and physical methods are presented. The chemical methods include self-polishing types such as tributyltin (TBT) self-polishing co- polymer coatings, which despite its good performance has been banned since 2008 because of its serious environmental impact. Therefore, other methods have been encouraged. These include coatings with copper compounds and biocide boosters to replace the TBT coatings. Biological extracts of secreted metabolites and enzymes are anticipated to act as antifoulants. Physical methods such as modification of surface topography, hydrophobic properties, and charge potential have also been considered to prevent biofouling. In this review, most of the current antifouling technologies are discussed. It is proposed that the physical antifouling technologies will be the ultimate antifouling solution, because of their broad-spectrum effectiveness and zero toxicity. | Shan Cao JiaDao Wang HaoSheng Chen DaRong Chen | 2011 | Chinese Science Bulletin2011，56，7： | 16 |
| 2 | Bionic Research on Fish Scales for Drag Reduction显示文摘 | Zhaoliang Dou Jiadao Wang Darong Chen | 2012 | Journal of Bionic Engineering2012，9，4： | 13 |
| 3 | Research progress on the ultra hydrophobic surface topography effect显示文摘Ultra hydrophobic surfaces take on bet- ter hydrophobicity and exhibit a water contact angle larger than 150°. In this paper the ultra hydrophobic- ity is analyzed and common fabrication methods are summarized in detail. The applications of micro to- pography in both the fabrication of hydrophobic sur- face and the experiments of drag reduction are ad- dressed. Finally, the development trend and fore- ground of ultra hydrophobic surface are discussed. | WANG Jiadao YU Ying CHEN Darong | 2006 | Chinese Science Bulletin2006，51，19： | 7 |
| 4 | Underwater drag reduction by gas显示文摘Publications on underwater drag reduction by gas have been gathered in the present study.Experimental methods,results and conclusions from the publications have been discussed and analyzed.The stable existence of gas is a requirement for underwater drag reduction induced by slippage at the water-solid interface.A superhydrophobic surface can entrap gas in surface structures at the water-solid interface.However,many experimental results have exhibited that the entrapped gas can disappear,and the drag gradually increases until the loss of drag reduction with immersion time and underwater flow.Although some other surface structures were also experimented to hold the entrapped gas,from the analysis of thermodynamics and mechanics,it is difficult to prohibit the removal of entrapped gas in underwater surface structures.Therefore,it is essential to replenish a new gas supply for continued presence of gas at the interface for continued underwater drag reduction.Active gas supplement is an effective method for underwater drag reduction,however,that needs some specific equipment and additional energy to generate gas,which limits its practical application.Cavitation or supercavitation is a method for passive gas generation,but it is only adaptive to certain vehicles with high speed.Lately,even at low speed,the evaporation induced by liquid-gas-solid interface of a transverse microgrooved surface for continued gas supply has been discovered,which should be a promising method for practical application of underwater drag reduction by gas. | Jiadao WANG Bao WANG Darong CHEN | 2014 | Friction2014，2，4： | 5 |
| 5 | Single Beacon Cruise Positioning Algorithm in Wireless Sensor Networks显示文摘 | ZHU Darong HAN Jianghong OU Jian MIN Jie | 2013 | Chinese Journal of Electronics2013，22，3： | 4 |
| 6 | Effect of roughness and wettability of silicon wafer in cavitation erosion显示文摘Material damage of silicon wafer with different roughness and wettability was investigated by using the self-made vibration cavitation apparatus in de-ionized water. Various roughness and wettability of sili- con wafer were achieved by changing their morphology and depositing Au, diamond-like carbon films (DLC films) on them. Surface morphology was observed with a scanning electron microscope (SEM) and a surface profilometer, and wettability was characterized by the contact angle measurement. The cavitation erosion results showed that many tiny pits and cracks appeared on the wafer surface as a result of brittle fractures; the number and size of the pits and cracks increased with experiment time, which made material flake away finally; cavitation occurred more easily on the silicon wafer surface with the augment of roughness or contact angle by changing surface morphology or depositing Au, DLC thin film on it, which consequently aggravated cavitation damage. | JIANG NaNa LIU ShiHan CHEN DaRong | 2008 | Chinese Science Bulletin2008，53，18： | 4 |
| 7 | Key roles of micro-particles in water on occurrence of cavitation-erosion of hydro-machinery显示文摘It has been believed for about one hundred years that the cavitation directly induces the cavitation erosion. It is proposed in this research that cavitation is only the necessary condition but not the sufficient condition of the cavitation erosion. The experiment performed on the rotary disk cavitation system shows that the micro-particles in the fluid play indispensable roles in the cavitation erosion process, and the generation of the erosion pits on the steel surface is also affected by the particles' size. These cracks and deformations on the sample surface indicate that the erosion is the result of the mechanical behavior. Numerical calculations are also provided to support this mechanism. | WANG JiaDao CHEN HaoSheng QIN Li LI Yongdian CHEN DaRong | 2008 | Chinese Science Bulletin2008，53，10： | 4 |
| 8 | Numerical simulation of underwater explosion bubble with a refined interface treatment显示文摘With the intermediate flow states predicted by local two phase Riemann problem,the modified ghost fluid method(MGFM)and its variant(r GFM)have been widely employed to resolve the interface condition in the simulation of compressible multi-medium flows.In this work,the drawback of the construction procedure of local two phase Riemann problem in r GFM was investigated in detail,and a refined version of the construction procedure was specially developed to make the simulation of underwater explosion bubbles more accurate and robust.Beside the refined r GFM,the fast and accurate particle level set method was also adopted to achieve a more effective and computationally efficient capture of the evolving multi-medium interfaces during the simulation.To demonstrate the improvement brought by current refinement,several typical numerical examples of underwater explosion bubbles were performed with original r GFM and refined r GFM,respectively.The results indicate that,when compared with original r GFM,numerical oscillations were effectively removed with the proposed refinement.Accordingly,with present refined treatment of interface condition,a more accurate and robust simulation of underwater explosion bubbles was accomplished in this work. | JIANG Liang GE Han FENG ChengLiang CHEN DaRong | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，4： | 3 |
| 9 | Electronic structures of the oxygenated diamond (100) surfaces显示文摘By means of first principles method on the basis of density functional theory (DFT), the equi- librium geometries and density of states (DOS) of the two oxygenated diamond (100) surfaces, bridging model and on-top model are calculated. The results indicate that there are no surface states located in the band gap of the bridging model of oxygenated dia- mond (100) surface, and the occupied surface states in the valence band are attributed to the non-bonded O 2p orbital, O 2p and C 2p bonding orbitals, and C 2p and H 1s bonding orbitals. By contrast, for the on-top model of oxygenated diamond (100) surface, the unoccupied surface states exist in the band gap, which originate from non-bonded C 2p and O 2p or- bitals. In addition, the occupied surface states in the valence band are induced by non-bonded O 2p or- bital and the C==O π bond. | LIU Fengbin WANG Jiadao LIU Bing LI Xuemin CHEN Darong | 2006 | Chinese Science Bulletin2006，51，20： | 3 |
| 10 | A prediction of drag reduction by entrapped gases in hydrophobic transverse grooves显示文摘The drag reduction effect of super-hydrophobic surface induced by the entrapped gas is unstable due to the gradual disappearance of the trapped gas.In this paper,a hydrophobic transverse grooved surface was designed to sustain gas in valleys.A detail numerical simulation was presented to investigate the flow field near the proposed surface.When water flowed over this surface,the entrapped gas was blocked by the ridges and the solid-liquid interface was replaced by the liquid-gas interface due to the entrapped gas,furthermore the micro-vortex formed in the groove.Because there was an effective slippage between water and solid induced by the entrapped gas,the velocity gradient of boundary layer decreased,which contributed to a remarkable drag reduction effect.Additionally,considering the extra undesired pressure drag reduction which negatively impacted the drag reduction effect of this method,the total drag coefficient including the viscous drag coefficient and the pressure coefficient was analyzed.An effective drag reduction rate of about 15%was achieved and the effect of this method was confirmed by experiments conducted in a high-speed water tunnel when grooves were optimized. | WANG Bao WANG JiaDao CHEN DaRong | 2013 | Science China(Technological Sciences)2013，56，12： | 3 |
| 11 | Affected zone generated around the erosion pit on carbon steel surface at the incipient stage of vibration cavitation显示文摘The characteristics of erosion pits on a carbon steel surface were investigated at the incipient stage of cavitation erosion. After a 5-minute experiment performed in an ultrasonic vibration system, needle-like erosion pits appeared on the polished steel surface, and a specially affected zone was formed around the pit. The shape of the pit and the plastic deformation of the affected zone indicate that the me- chanical impaction on the surface is the main reason for the cavitation damage. On the other hand, the iridescent color, the decreased surface hardness and the precipitated carbides on the affected zone prove that the affected zone has experienced a tempering process with the temperature higher than 300°C. The lack of oxygen in the affected zone also proves that it is not a chemical oxygen result. A special phenomenon that a carbon ring forms in the affected zone is explained as a result of the toroidal bubbles' heating effect at the final stage of the bubble collapse. | CHEN HaoShenh LI Jiang LIU ShiHan CHEN DaRong WANG JiaDao | 2008 | Chinese Science Bulletin2008，53，6： | 3 |
| 12 | Synthesis of Biomimetic Superhydrophobic Surface through Electrochemical Deposition on Porous Alumina显示文摘 | Jiadao Wang Ang Li Haosheng Chen Darong Chen | 2011 | Journal of Bionic Engineering2011，8，2： | 3 |
| 13 | Study on design of the regular concave surface profiles显示文摘Regular concave surface profiles are adopted in many friction surfaces. But up to now,this is seldom tutored by the theory of lubrication. To design them, a model of the regular depthoptimization was provided. To determine the other size, two propositions are given. At same time,two main effect factors on lubrication were discussed in detail. A lubrication test for different regu-lar concave surface profiles was performed on a pin and ring tester. On the basis of theory analy-sis and experiment, a principle to design regular concave surface profiles is provided. | WANG Jiadao CHEN Darong LI Xiaodi KONG Xianmei State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China | 2001 | Science China Mathematics2001，44，S1： | 2 |
| 14 | Equilibrium geometric structure and electronic properties of Cl and H_2O co-adsorption on Fe(100) surface显示文摘Based on the first principles density functional theory,the equilibrium geometric structure and surface electronic properties of Cl and H2O co-adsorption on the Fe(100) surface are investigated.The results indicate that the optimal adsorption site for Cl and H2O co-adsorption on the Fe(100) surface is the location of Cl at the bridge site and H2O at the top site.Compared with the Fe(100)/H2O adsorption system,remarkable changes in geometric structure and electronic properties occur,owing to the presence of Cl in the Fe(100)/(H2O+Cl) adsorption system.The analysis of equilibrium geometric structure and surface electronic properties shows that the presence of Cl in the Fe(100)/(H2O+Cl) adsorption system unstablizes the Fe surface,making it easy to lose electrons. | ZHAO Wei WANG JiaDao LIU FengBin CHEN DaRong | 2009 | Chinese Science Bulletin2009，54，8： | 2 |
| 15 | Evaluation of transgenic Bt corn for resistance to the Asian corn borer (Lepi- doptera: Pyralidae)显示文摘 | Pie Kanglai Wang Zhenying Zhou Darong | 2003 | Journal of Economic Entomology2003，96，3： | 1 |
| 16 | Water erosion mechanism of mild carbon steels induced by micro-particles显示文摘To clarify the water erosion mechanism of the mild carbon steels, the water erosion experiments were performed by using deionized water as steam source. The results showed that under the damage threshold velocity of liquid impact, the material surface would not be destroyed. However, when the micro-particles were added into the steam, the pits appeared on the surface soon. By comparison, it is found that the pits are quite different from those induced by micro-particles impact without steam, but similar to those induced by cavitation erosion. The results indicated that the water erosion mechanism was similar to that of cavitation erosion under the damage threshold velocity. The micro-particles carry the micro-bubbles to approach the surface of the material, and the micro-bubbles collapse and generate micro-jet to impinge vertically on the surface, which lead to the produce of pits. | XU WanLi QIN Li WANG JiaDao CHEN HaoSheng CHEN DaRong | 2009 | Chinese Science Bulletin2009，54，24： | 1 |
| 17 | Msi1 confers resistance to TRAIL by activating ERK in liver cancer cells显示文摘 | Nianli Liu Tianran Chen Xiaohong Wang Darong Yang Binbin Xue Haizhen Zhu | 2015 | FEBS Letters2015，，： | 1 |
| 18 | Volatiles from Ficus hispida and their attractiveness to fig wasps显示文摘 | QISHI SONG DARONG YANG GUANGMING ZHANG | 2001 | Journal of Chemical Ecology2001，27，10： | 1 |
| 19 | Experimental study on the special shear thinning process of a kind of non-Newtonian fluid显示文摘To study the effect of long chain molecule and surface active agent on non-Newtonian fluid properties, rheological experiments on two different fluids have been done. The first group of the fluid is the hydroxyethyl cellulose water solution, and the second is the water solution containing the mixture of dodecyl- triethyl ammonium bromide and lauryl sodium sulfate. With the increasing shear rate, shear thinning phenomenon appears in the first group of solution, and a spe- cial shear thickening-shear thinning phenomenon appears in the second group. It is considered that the special rheological phenomenon is caused by the difference between the aggregating and the departing speed of the colloidal particles formed in the fluid. The difference between the two speeds relates with the shear rate. The experiment results indicate that the rheological properties can be designed by choosing proper additives at a certain shear rate, and such a fluid with special vis- cosity variation should be included in the classification of the non-Newtonian fluid. | CHEN HaoSheng CHEN DaRong WANG JiaDao LI YongJian | 2007 | Science China(Technological Sciences)2007，50，2： | 1 |
| 20 | Incipient fault diagnosis on active disturbance rejection control显示文摘Dear editor,The incipient fault diagnosis method has received great attention in recent decades owing to the increasing demand for reliability and safety in industrial processes[1,2].A controller of active disturbance rejection control(ADRC)can effectively separate the incipient fault from the disturbance.Therefore,studying the incipient fault estimation has become a necessarily imminent research topic in this new frontier. | Darong HUANG Xingxing HUA Bo MI Yang LIU Zhenyuan ZHANG | 2022 | Science China(Information Sciences)2022，65，9： | 1 |
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