我国地方政府征地补偿信息公开现状的评估

本文就我国地方政府网站征地补偿信息公开水平提出了一套评估指标,并把它们运用于评估287个直辖市和地级市国土局网站,发现地方政府征地信息公开的总体情况较差,仅有三分之一强的国土局网站能做到及时、完整地提供征地补偿信息,其余的则做不到这一点,甚至有超过40%的城市国土局网站根本不提供相关信息;此外,征地信息公开的地区差异很大,东中部高于全国平均水平,且明显好于西部;南方又明显好于北方;并提供了地方政府征地信息公开状况的城市榜单,广州市、武汉市名列头两名。教育部人文社会科学重点研究基地重大项目“住房权:中国的一项新的社会议程的构建”(项目编号:13JJD630013

First report of Gyrodinium fusiforme and G.moestrupii (Dinophyceae) in China Sea waters

甲藻环沟藻属于一类无色素体、表面有脊的裸甲藻,因可捕食一些重要的赤潮生物而在海洋生态系统中扮演着重要的角色。有关中国近海环沟藻属的物种多样性信息非常有限。本文报道了2个新记录种——纺锤环沟藻(gyrOdInIuM fuSIfOrME)和莫氏环沟藻(g.MOESTruPII)。纺锤环沟藻细胞呈纺锤形,长48.0–58.0μM,宽18.0–23.0μM,长宽比为2.4–3.0,和模式种相比体型和长宽比都较小。莫氏环沟藻细胞也呈纺锤形,长约30μM,宽约15μM。我们测定了纺锤环沟藻和莫氏环沟藻大亚基的部分序列,并根据大亚基序列利用最大似然法和贝叶斯法建立了系统发育树。结果显示环沟藻属是单源的,纺锤环沟藻和裂缝环沟藻(g.fISSuM)聚合在一起,但是与螺旋环沟藻(g.SPIrAlE)分离。纺锤环沟藻和莫氏环沟藻分别可以摄食米氏凯伦藻(kArEnIA MIkIMOTOI)和具齿原甲藻(PrOrOCEnTruM dEnTATuM),前者在米氏凯伦藻赤潮中的大量出现显示它可以促进赤潮的消退。The athecate dinoflagellate genus Gyrodinium includes heterotrophic species that prey on other dinoflagellates,and thus play an important role in marine ecology.Information about the Gyrodinium diversity along the coast of China is limited.Here we report on the characteristics of two species,Gyrodinium fusiforme Kofoid & Swezy and Gyrodinium moestrupii Yoon,Kang,and Jeong that were isolated from a Karenia mikimotoi bloom sample in the East China Sea.The cells of G.fusiforme were fusiform with a length of 48.0–58.0 μm and a width of 18.0–23.0 μm.Cells of G.moestrupii were also fusiform and approximately 30 μm long and 15 μm wide.Partial large subunit(LSU) ribosomal DNA sequences were obtained from single cells of G.fusiforme and G.moestrupii and phylogenetic trees were built using maximum likelihood(ML) and Bayesian inference(BI).In the phylogenetic trees the genus Gyrodinium is monophyletic,and G.fusiforme groups together with G.fissum,but separates from G.spirale although they are similar in morphology.G.fusiforme and G.moestrupii can prey on Karenia mikimotoii and Prorocentrum dentatum respectively.The high abundance of G.fusiforme during K.mikimotoi bloom suggests it may play a role in bloom decline.福建省自然科学基金(2012J01135

Unsupervised Noise Reductions for Gravitational Reference Sensors or Accelerometers Based on the Noise2Noise Method

Onboard electrostatic suspension inertial sensors are important applications for gravity satellites and space gravitational-wave detection missions, and it is important to suppress noise in the measurement signal. Due to the complex coupling between the working space environment and the satellite platform, the process of noise generation is extremely complex, and traditional noise modeling and subtraction methods have certain limitations. With the development of deep learning, applying it to high-precision inertial sensors to improve the signal-to-noise ratio is a practically meaningful task. Since there is a single noise sample and unknown true value in the measured data in orbit, odd-even sub-samplers and periodic sub-samplers are designed to process general signals and periodic signals, and adds reconstruction layers consisting of fully connected layers to the model. Experimental analysis and comparison are conducted based on simulation data, GRACE-FO acceleration data, and Taiji-1 acceleration data. The results show that the deep learning method is superior to traditional data smoothing processing solutions

A brief analysis to Taiji: Science and technology

The space gravitational wave (GW) antennae is more sensitive to the lower frequency GW signals compare with the ground-based GW detectors. The space mission Taiji is designed to detect the GW sources within frequencies between 0.1 mHz and 1 Hz. A preliminary study of Taiji was started in 2008. Up to now, a sophisticated mission design of Taiji have gradually taken shape. The research and development of the key technologies for Taiji is now officially launched. A brief introduction to the analysis and the pre-work of the Taiji technology are given here

Modification method of numerical calculation of heat flux over dome based on turbulence models

For the optical guidance system flying at low altitude and high speed, the calculation of turbulent convection heat transfer over its dome is the key to designing this kind of aircraft. RANS equations-based turbulence models are of high computation efficiency and their calculation accuracy can satisfy the engineering requirement. But for the calculation of the flow in the shock layer of strong entropy and pressure disturbances existence, especially of aerodynamic heat, some parameters in the RANS energy equation are necessary to be modified. In this paper, we applied turbulence models on the calculation of the heat flux over the dome of sphere-cone body at zero attack. Based on Billig’s results, the shape and position of detached shock were extracted in flow field using multi-block structured grid. The thermal conductivity of the inflow was set to kinetic theory model with respect to temperature. When compared with Klein’s engineering formula at the stagnation point, we found that the results of turbulent models were larger. By analysis, we found that the main reason of larger values was the interference from entropy layer to boundary layer. Then thermal conductivity of inflow was assigned a fixed value as equivalent thermal conductivity in order to compensate the overestimate of the turbulent kinetic energy. Based on the SST model, numerical experiments showed that the value of equivalent thermal conductivity was only related with the Mach number. The proposed modification approach of equivalent thermal conductivity for inflow in this paper could also be applied to other turbulence models