Mg2+、Mn2+对波吉卵囊藻生长的影响

【目的】研究Mg²⁺、Mn²⁺对波吉卵囊藻生长和多糖代谢的影响。【方法】取蒸馏水培养数日后的波吉卵囊藻液接入以f/2培养液的配方为基础的新鲜培养液中,Mg²⁺浓度梯度分别设置为0、1、2、4、8 mg/L,Mn²⁺浓度梯度分别设置为0、0.005、0.050、0.500、5.000 mg/L,实验周期为10 d。【结果与结论】不同浓度Mg²⁺、Mn²⁺对波吉卵囊藻的生长有显著性影响,当Mg²⁺质量浓度为2 mg/L时,波吉卵囊藻的相对增长率、色素蛋白含量均出现最大值,显著高于Mg²⁺添加量为0、4和8 mg/L的组(P<0.05),当Mn²⁺质量浓度为0.005 mg/L时,波吉卵囊藻相对增长率、色素蛋白含量均出现最大值,显著高于Mn²⁺添加量0、0.050、0.500和5.000 mg/L组(P<0.05)。不同浓度Mg²⁺、Mn²⁺对波吉卵囊藻胞外多糖含量有显著影响(P<0.05),当Mg²⁺质量浓度>2 mg/L、Mn²⁺质量浓度>0.005 mg/L时,波吉卵囊藻生长均受到胁迫,其胞外多糖合成量明显增加,以保护藻体不受危害;当Mg²⁺质量浓度为8 mg/L、Mn²⁺质量浓度为5.000 mg/L时,波吉卵囊藻胞外多糖含量分别为对照组的2.43和3.36倍。     

具有强占型优先权的不耐烦顾客的M/M/m/2k-m排队模型

首先给出了只有一类不耐烦顾客的M／M／m排队模型，其中顾客到达与服务都服从相互独立的泊松分布，顾客的耐心等待期限截止到服务开始前，并服从指数分布，最终得到了顾客丢失率及稳态下的队长分布。利用此结论研究了具有多个服务台，两类到达顾客的M／M／m/2k-m排队系统，其中第一类顾客对于第二类顾客具有强占型优先权，顾客的耐心等待时间即等待期限仍服从指数分布，两类顾客具有各自的等待轨道。采用矩阵分析的方法给出了两类顾客各自的稳态分布，并作了相应的性能分析。     

基于Sentinel-1/2动态耦合移栽期特征的水稻种植模式识别

及时准确地获取水稻种植模式变化对于有效防控“非粮化”和完成“双碳”目标具有重要意义。现有研究多基于固定时间窗口挖掘水稻生长期特征,且多使用的是单一卫星影像数据,难以应用于大范围水稻制图。本文通过Sentinel-1/2数据构建动态窗口提取移栽期光学/雷达特征,利用其耦合关系实现水稻种植模式制图。将该算法应用于湖南和江西两省水稻制图。基于1402个地面参考点位对水稻提取结果进行验证,总体精度达92.80%;在县域尺度上,湖南和江西两省水稻制图面积与农业统计数据也具有高度一致性,R²达0.85以上。相比于用固定窗口进行水稻特征提取,该方法具有较强的鲁棒性和迁移能力,为实现更大范围作物制图提取提供新的思路和参考依据。2018—2021年江西省水稻制图结果表明,水稻总种植面积减少9.47%,约3460 km²,水稻种植强度从1.62下降至1.49;在种植模式上,“双改中”趋势明显,双季稻种植面积锐减21.61%,其中约84%改种中稻。     

GPS/BDS-2/Galileo混合双差相对定位模型应用于短基线精密定位研究

对单/双频GPS/BDS/Galileo混合双差相对定位模型算法进行研究,推导了GPS/BDS/Galileo混合双差相对定位模型。选择短基线数据进行实验,对GPS、GPS/BDS标准双差、GPS/BDS混合双差、GPS/Galileo混合双差以及GPS/BDS/Galileo混合双差解算模式在定位精度、模糊度固定速度方面进行对比分析。结果表明,相对于GPS单系统或GPS/BDS双系统标准双差解算模式,双系统或三系统混合双差解算模式能有效提高模糊度首次固定时间,定位精度也有一定程度的提升。     

Anticorrosion Coatings from Poly(Aniline-co-2-Ethylaniline) Micro/Nanostructures

PANI copolymer micro/nanostructures with different surface wettability were obtained from the chemical oxidation copolymerization of aniline(Ani) with 2-ethyl aniline(EA) at diverse [EA]/[Ani+EA] molar ratios, by employing ammonium persulfate as an oxidant. The results revealed that the poly(aniline-co-2-ethyl aniline)(PANI-EA) copolymer micro/nanostructures exhibited satisfactory anticorrosion performance for carbon steel, and the corrosion protection efficiency increased with the increase of water repellent property. Poly(2-ethyl aniline)(PEA) showed the largest contact angle(CA=145°) and show the best corrosion protection for the carbon steel(h = 87.29%). It is found that the superior anticorrosion property of PEA is attributed to its high hydrophobicity, low conductivity and low porosity.     

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页岩黏土矿物CH_4/CO_2吸附规律的分子模拟

CH4和CO2在页岩黏土矿物中的吸附行为对页岩气的开采和CO2的封存具有重要意义。选取黏土矿物的主要成分蒙脱石为研究对象,构建层状裂缝型孔隙的分子模型,采用巨正则系综蒙特卡洛(GCMC)方法和分子动力学(MD)方法,在不同压力、不同温度条件下,研究不同狭缝孔隙宽度CH4和CO2气体的吸附行为,同时分析离子交换结构对吸附的影响。结果表明:CH4吸附符合Langmuir吸附规律,可以采用Langmuir方程进行拟合。随着温度的升高两种气体吸附量减小,随着压力的增大而增大;蒙脱石的离子交换结构对CH4的吸附影响较小,但促进对CO2的吸附;不同的狭缝孔隙宽度对应CH4和CO2的赋存状态不同,蒙脱石的离子交换结构影响CO2的赋存状态;平均作用势说明吸附层中分子间结合能力大于游离层,吸附态是CH4和CO2在蒙脱石狭缝中的主要赋存形式之一。基于CH4和CO2在页岩黏土矿物中的吸附规律,可为页岩气的勘探开发提供依据。     

金坛岩盐卤水中Ca2+含量分析及处理方法

以陈家庄盐矿为研究对象,对原岩卤水中Ca2+含量的变化进行分析,同时也对用CaCl2为原料的精制卤水中Ca2+含量的变化进行了分析,从Ca2+在卤水中溶解度的角度出发,提出降低Ca2+含量(同时降低卤水中SO42-的含量)的几种方法.     

Polysaccharides purified from wild Cordyceps activate FGF2/FGFR1c signaling

Land animals as well as all organisms in ocean synthesize sulfated polysaccharides. Fungi split from animals about 1.5 billion years ago. As fungi make the evolutionary journey from ocean to land, the biggest changes in their living environment may be a sharp decrease in salt concentration. It is established that sulfated polysaccharides interact with hundreds of signaling molecules and facilitate many signaling transduction pathways, including fibroblast growth factor(FGF) and FGF receptor signaling pathway. The disappearance of sulfated polysaccharides in fungi and plants on land might indicate that polysaccharides without sulfation might be sufficient in facilitating protein ligand/receptor interactions in low salinity land. Recently, it was reported that plants on land start to synthesize sulfated polysaccharides in high salt environment, suggesting that fungi might be able to do the same when exposed in such environment. Interestingly, Cordyceps, a fungus habituating inside caterpillar body, is the most valued traditional Chinese Medicine. One of the important pharmaceutical active ingredients in Cordyceps is polysaccharides. Therefore, we hypothesize that the salty environment inside caterpillar body might allow the fungi to synthesize sulfated polysaccharides. To test the hypothesis, we isolated polysaccharides from both lava and sporophore of wild Cordyceps and also from Cordyceps militaris cultured without or with added salts. We then measured the polysaccharide activity using a FGF2/FGFR1 c signaling-dependent Ba F3 cell proliferation assay and found that polysaccharides isolated from wild Cordyceps activated FGF2/FGFR signaling, indicating that the polysaccharides synthesized by wild Cordyceps are indeed different from those by the cultured mycelium.     

CO2-盐水相对渗透率影响机制研究进展

将CO₂封存于地下深部含水层,是减轻碳排放压力的有效手段之一。CO₂-盐水相对渗透率是影响地层中CO₂迁移、捕获的最重要参数之一。在借鉴油气资源领域渗透率研究成果的基础上,详细论述了影响CO₂-盐水相对渗透率的因素,包括流体性质、流体饱和历史和岩石结构,认为流体性质对相对渗透率的影响主要体现在界面张力、黏度比和毛管数的大小;不同流体饱和历史的相对渗透率曲线存在明显滞后性;岩石结构通过矿物润湿性和孔隙结构差异影响相对渗透率大小;最终得到的相对渗透率曲线是各因素叠加的综合结果。      

复合光催化剂Cu_2(OH)PO_4/Ni(OH)_2的制备及其光催化性能

采用水热合成法在Cu2(OH)PO4表面原位沉积Ni(OH)2,制备异质结型的复合光催化剂Cu2(OH)PO4/Ni(OH)2;利用X线粉末衍射仪(XRD)、紫外-可见漫反射光谱仪(UV-Vis-DRS)和扫描电子显微镜(SEM)等,对其相结构、光吸收性能和微观形貌进行表征.结果表明:该复合光催化剂具有良好的紫外光吸收特性,是一类新型的光催化剂.复合光催化剂在紫外光下可以有效降解亚甲基蓝(MB)溶液,当Cu2(OH)PO4与Ni(OH)2的摩尔比为0.2时,Cu2(OH)PO4/Ni(OH)2具有最大催化活性.根据光催化中加入不同活性物种牺牲剂的实验,推测该异质结型材料光催化过程中光生载流子的传输方向及活性物种.Cu2(OH)PO4/Ni(OH)2的催化活性增强主要归结为复合时在两者之间形成有效的异质结,结区的内建电场能够促进光生载流子的分离,同时·OH和h+在光催化降解过程中是主要的活性物种.     

GF-1/2卫星数据地质灾害调查应用能力分析

随着我国航天技术和卫星技术的迅速发展,我国自主发射的卫星遥感数据因其质量高、价格低廉的特点越来越受到各行各业用户的青睐。本文在对地质灾害调查与监测业务需求分析的基础上,开展GF-1/2在地质灾害调查与监测应用中的能力分析和示范应用,促进了GF-1/2数据在地质灾害调查与监测中的规模化和产业化应用。     

"第二届GIS/RS在水文水资源及环境中的应用国际会议(ICGRHWE''''07)"暨"第二届基于GIS及遥感技术的洪水预报与管理国际学术研讨会(FM2S''''07)"

“第二届GIS/RS在水文水资源及环境中的应用国际会议(ICGRHWE'07)”暨“第二届基于GIS及遥感技术的洪水预报与管理国际学术研讨会(FM2S'07)”;国家:中国;会议召开地点:广东省广州市;组织者:中国中山大学,英国布里斯托尔大学,日本京都大学;提交摘要截止时间:2007年3月30日;摘要录用通知时间:2007年     

Synthesis and Excellent Antibacterial Activity of Ag2O-Loaded Carboxymethyl Starch Nanocomposites

Carboxymethyl starch/silver oxide nanocomposites(CMS-Ag₂O NCs) were successfully fabricated by modifying carboxymethyl starch(CMS) with Ag₂O obtained from an aqueous AgNO₃ solution as silver source. Ag₂O nanoparticles(NPs) formed on the surface of CMS by ion exchange. Based on SEM images, the diameters of Ag₂O NPs were determined to be between 50 and 100 nm. From the XRD spectra of CMS-Ag₂O NCs, the new diffraction peaks appeared ...     

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Polar Sea Ice Identification and Classification Based on HY-2A/SCAT Data

In this paper,a Bayesian sea ice detection algorithm is first used based on the HY-2A/SCAT data,and a backpropagation(BP)neural network is used to classify the Arctic sea ice type.During the implementation of the Bayesian sea ice detection algorithm,linear sea ice model parameters and the backscatter variance suitable for HY-2A/SCAT were proposed.The sea ice extent obtained by the Bayesian sea ice detection algorithm was projected on a 12.5 km grid sea ice map and validated by the Advanced Microwave Scanning Radiometer 2(AMSR2)15%sea ice concentration data.The sea ice extent obtained by the Bayesian sea ice detection al-gorithm was found to be in good agreement with that of the AMSR2 during the ice growth season.Meanwhile,the Bayesian sea ice detection algorithm gave a wider ice edge than the AMSR2 during the ice melting season.For the sea ice type classification,the BP neural network was used to classify the Arctic sea ice type(multi-year and first-year ice)from January to May and October to De-cember in 2014.Comparison results between the HY-2A/SCAT sea ice type and Equal-Area Scalable Earth Grid(EASE-Grid)sea ice age data showed that the HY-2A/SCAT multi-year ice extent variation had the same trend as the EASE-Grid data.Classification errors,defined as the ratio of the mismatched sea ice type points between HY-2A/SCAT and EASE-Grid to the total sea ice points,were less than 12%,and the average classification error was 8.6%for the study period,which indicated that the BP neural network classification was a feasible algorithm for HY-2A/SCAT sea ice type classification.     

J2EE在电力系统工作票信息化管理中的应用--从C/S模式到B/S多层模式的转换

介绍了传统C／S模式在电力工作票管理信息系统中的应用及其问题，同时介绍J2EE多层分布式体系结构在工作票管理系统中应用的可行性。通过对传统C／S电力系统工作票管理系统的分析，提出将J2EE应用于工作票管理系统的思想并进行实践。     

Estimates of global M_2 internal tide energy fluxes using TOPEX/POSEIDON altimeter data

TOPEX/POSEIDON altimeter data from October 1992 to June 2002 are used to calculate the global barotropic M2 tidal currents using long-term tidal harmonic analysis. The tides calculated agree well with ADCP data obtained from the South China Sea (SCS). The maximum tide velocities along the semi-major axis and semi-minor axis can be computed from the tidal ellipse. The global distribution of M2 internal tide vertical energy flux from the sea bottom is calculated based on a linear internal wave generation model. The global vertical energy flux of M2 internal tide is 0.96 TW, with 0.36 TW in the Pacific, 0.31 TW in the Atlantic and 0.29 TW in the Indian Ocean, obtained in this study. The total horizontal energy flux of M2 internal tide radiating into the open ocean from the lateral boundaries is 0.13 TW, with 0.06 TW in the Pacific, 0.04TW in the Atlantic, and 0.03 TW in the Indian Ocean. The result shows that the principal lunar semi-diurnal tide M2 provides enough energy to maintain the large-scale thermohaline circulation of the ocean.     

CO2基增强型地热系统中流体-花岗岩相互作用研究进展及展望

CO₂与水相比,膨胀性大、黏度低、与岩石反应程度低,并且在作为增强型地热系统（EGS）渗流传热流体时,比水具有更高的换热效率。对CO₂-EGS生产过程中储层岩石物性变化的研究具有重要意义,从理论研究、实验研究、数值模拟3个方面,对CO₂基增强型地热系统CO₂-EGS中流体-岩石相互作用的研究现状进行了总结,并且从矿物成分、微观孔结构和力学性质3个方面对储层岩石性质的变化进行了评价。结果表明,CO₂-水-岩石相互作用参与反应的矿物主要为石英、长石类;而沉淀的矿物为蒙脱石、伊利石及方解石等。CO₂-水-岩石相互作用会导致储层岩石的力学性质下降,孔隙结构特征改变。最后,讨论了CO₂作为EGS渗流传热流体仍需攻克的难点问题,包括:CO₂的热动力学特征、换热效率,CO₂-水-岩石的相互作用及其对储层性质的改变,影响CO₂-EGS经济性的因素,以及CO₂-EGS数值模型的研究等。针对这些方面的研究可为今后CO₂-EGS的开发奠定基础。      

Estimates of global M 2 internal tide energy fluxes using TOPEX/POSEIDON altimeter data

TOPEX/POSEIDON altimeter data from October 1992 to June 2002 are used to calculate the global barotropic M ₂ tidal currents using long-term tidal harmonic analysis. The tides calculated agree well with ADCP data obtained from the South China Sea (SCS). The maximum tide velocities along the semi-major axis and semi-minor axis can be computed from the tidal ellipse. The global distribution of M ₂ internal tide vertical energy flux from the sea bottom is calculated based on a linear internal wave generation model. The global vertical energy flux of M ₂ internal tide is 0.96 TW, with 0.36 TW in the Pacific, 0.31 TW in the Atlantic and 0.29 TW in the Indian Ocean, obtained in this study. The total horizontal energy flux of M ₂ internal tide radiating into the open ocean from the lateral boundaries is 0.13 TW, with 0.06 TW in the Pacific, 0.04TW in the Atlantic, and 0.03 TW in the Indian Ocean. The result shows that the principal lunar semi-diurnal tide M ₂ provides enough energy to maintain the large-scale thermohaline circulation of the ocean. Supported by the National Basic Research Program of China (973 Program, No. 2005CB422303), the International Cooperation Program (No. 2004DFB02700), and the National Natural Science Foundation of China (No. 40552002). The TOPEX/POSEIDON data are provided by Physical Oceanography Distributed Active Archive Center (PO DACC)