检索结果-南通市图书馆

Nutrient Release from Weathering of Purplish Rocks in the Sichuan Basin,China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2008年第2期18卷 257-264页

作者： ZHU Bo WANG tao you Xiang GAO Mei-rong Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 （China）

Purplish soils having high fertility with mineral nutrients inherited from the parent rock are widely distributed in the hills along the Yangtze River,especially in the Sichuan *** and field weathering experiments were conducted to mimic rock weathering and nutrient release processes in order to better understand soil fertility and nutrient compensation. Three types of purplish rock formations formed in the Jurassic period,Shaximiao(J_2s),Suining(J_3s),and Penglaizhen (J_3p),as well as one type formed in the Cretaceous period,the Chengqiangyan group(K_1c),were used in this study. Results showed that the soil formation rate was in the range from 11.2 to 19.6 mm every year,and rock weathering was in the order of J_3s>J_3p>J_2s>K_*** more rock surface was exposed to sunlight and rainfall in field conditions,pot weathering was slower than field *** release rates increased with rock weathering and was in the order similar to that of rock weathering:J_3p>J_3s>J_2s>K_*** release was the most important in all rocks;after 2 years of weathering,19.4% to 46.9% of K was released from the initial parent rocks,which suggested that K release from weathering could meet most of the crop K requirement in purplish ***,rapid release of nutrients from weathering of purplish rocks was key to nutrient replenishment and fertility of purplish soils.

关键词： nutrient release purplish rock soil formation weathering

Geochronology and Geochemistry of the Granites from the Longtoushan Hydrothermal Gold Deposit in the Dayaoshan Area,Guangxi:Implication for Petrogenesis and Mineralization

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2019年第2期30卷 309-322页

作者： Lihua Qian Jianqing Lai Lifang Hu rong Cao Shilong tao Bei you Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-physicsCentral South University

The gold mineralization in the Longtoushan hydrothermal gold deposit is concentrated within the contact zone of the granitic complex. Whole rock geochemistry and in-situ U-Pb and Hf isotopic data were used to constrain the genesis and age of the granites and related Cu-Au mineralization in the Longtoushan Deposit. The granites mainly consist of the granite porphyry, rhyolite porphyry, porphyritic granite and quartz porphyry. LA-ICP-MS U-Pb dating of zircons from the granite porphyry, rhyolite porphyry and quartz porphyry indicates that they intruded from ca. 94 to 97 Ma. These intrusions exhibit similar trace element characteristics, i.e., right-dipping REE patterns, depletion of Ba, Sr, P and Ti, and enrichment of Th, U, Nd, Zr and Hf. The εHf(t) values of zircons from the granite porphyry, rhyolite porphyry and quartz porphyry range from-26.81 to-8.19,-8.12 to-5.33, and-8.99 to-5.83, respectively, suggesting that they were mainly derived from the partial melting of the Proterozoic crust. The Cu-Au mineralization is mainly related to the rhyolite porphyry and porphyritic granite, respectively. The Longtoushan granites were most likely formed in a post-collisional extensional environment, and the deposit is a part of the Late Yanshanian magmatism related mineralization in the Dayaoshan area and its adjacent areas.

关键词： Longtoushan gold deposit rhyolite porphyry zircon U-Pb dating Hf isotopes petrogenesis Cu-Au mineralization

Different prognostic association of systolic blood pressure at different time points with postdischarge events in patients hospitalized for decompensated heart failure

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2019年第9期16卷 676-688,I0006-I0009页

作者： you-Nan YAO rong-Cheng ZHANG tao AN Qi ZHANG Xin-Ke ZHAO Jian ZHANG State Key Laboratory of Cardiovascular Disease Heart Failure Care Unit of Fuwai Hospital National Center for Cardiovascular Diseases Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China The Affiliated Hospital of Gansu University of Chinese Medicine Lanzhou China

Background The association of systolic blood pressure(SBP) with mortality in heart failure(HF) patients is paradoxical, and the time points of baseline SBP are also different across prior studies. We hypothesized that the levels of SBP at admission and at discharge had different associations with postdischarge events. Methods The study population included patients hospitalized for decompensated HF in the Heart Failure Center of Fuwai Hospital from January 1, 2009 to December 31, 2014. The primary outcome was a composite of cardiovascular(CV) death and heart transplantation. Multivariate Cox proportional-hazards and restricted cubic spline analyses were used to assess the relationships between SBP at different time points and outcomes. Results In total, 2005 patients were included with a median follow-up of 48.4 months. The median age was 59 years, and 69.9% were male. Multivariate Cox analyses showed that compared with SBP < 105 mm Hg, higher SBP at admission was associated with better long-term primary outcome(105–119 mm Hg, HR = 0.764, P = 0.005;120-134 mm Hg, HR = 0.658, P < 0.001;≥ 135 mm Hg, HR = 0.657, P = 0.001). Patients whose discharge SBP was higher than 135 mm Hg had a similar primary outcome as those with SBP < 105 mm Hg(HR = 0.969, P = 0.867), and the results remained unchanged even after adjusting for admission SBP(HR = 1.235, P = 0.291). The results of restricted cubic spline analysis indicated similar associations. Conclusions Lower but not higher SBP at admission is associated with more CV deaths/heart transplantations(a reverse J-shaped curve). In contrast, there is a U-shaped association between discharge SBP and CV mortality/heart transplantation.

关键词： Admission Discharge Heart failure Outcome Systolic blood pressure

在线全文

学校读者我要写书评

暂无评论

饮用水的铝盐降氟工艺比较研究

卫生研究 1988年第1期 15-18页

作者：何淑敏李树猷樊荣涛龙凌燕中国预防医学科学院环境卫生与卫生工程研究所

本文报告了三种铝盐混凝沉淀与混凝沉淀加过滤工艺降氟的试验结果。铝盐一般适合含氟量小于4mg/L的原水降氟氟。降后的混凝剂沉渣不会因为浸泡而向水中释放F-,且可重复利用1～2次,并能节约混凝剂用量16％左右。混凝沉淀加过滤的降氟工... 详细信息

本文报告了三种铝盐混凝沉淀与混凝沉淀加过滤工艺降氟的试验结果。铝盐一般适合含氟量小于4mg/L的原水降氟氟。降后的混凝剂沉渣不会因为浸泡而向水中释放F-,且可重复利用1～2次,并能节约混凝剂用量16％左右。混凝沉淀加过滤的降氟工艺的卫生效益和经济效益均优于单纯沉淀工艺,其出水中的F-<1.0 mg/L,浊度<0.10NTU,Al+3<0.20 mg/L。

关键词：铝盐混凝沉淀降氟残留氟残铝

On the effect of Fe(Ⅲ) on proliferation of Microcystis aeruginosa at high nitrate and low chlorophyll condition

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第2期29卷 105-110页

作者： rong Chen Zhen Lei Jiayuan Ji Xiaochang Wang Yu-you Li Yuan Yang Lu Zhang tao Xue Key Lab of Northwest Water Resource Environment and Ecology MOE Xi'an University of Architecture and Technology Department of Civil and Environmental Engineering Graduate School of Engineering Tohoku University

The impact of Fe concentrations on the growth of Microcystis aeruginosa in aquatic systems under high nitrate and low chlorophyll conditions was studied. The responses of cell density,total and cell chlorophyll-a intracellular Fe content and organic elemental composition of *** to different concentration gradients of Fe（Ⅲ） in the solutions were analysed. The results showed that the proliferation speeds of M. aeruginosa were：（1） decelerated when the Fe（Ⅲ） concentration was lower than 50 μg/L in the solutions,（2） promoted and positively related to the increase of Fe（Ⅲ） concentration from 100 to 500 μg/L in the solutions over the experimental period, and（3） promoted in the early stage but decelerated in later stages by excess adsorption of Fe by cells when the Fe（Ⅲ） concentration was higher than 500 μg/L in the solutions. The maximum cell density, total and cell chlorophyll-a were all observed at 500 μg Fe（Ⅲ）/L concentration. The organic elemental composition of M. aeruginosa was also affected by the concentration of Fe（Ⅲ） in the solutions, and the molecular formula of M. aeruginosa should be expressed as C7–7.5H14O0.8–1.3N3.5–5according to the functions for different Fe（Ⅲ）concentrations. Cell carbon and oxygen content appeared to increase slightly, while cell nitrogen content appeared to decrease as Fe（Ⅲ） concentrations increased from 100 to 500 μg/L in the solutions. This was attributed to the competition of photosynthesis and nitrogen adsorption under varying cell Fe content.

关键词： High nitrate Low chlorophyll Fe Microcystis aeruginosa Cell chlorophyll a Organic element composition

Competitive Cloud Pricing for Long-Term Revenue Maximization

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2019年第3期34卷 645-656页

作者： Jiang rong tao Qin Bo An Institute of Computing Technology Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Microsoft Research Asia Beijing 100080China School of Computer Science and Engineering Nanyarig Technological UniversitySingapore 639798Singapore

We study the pricing policy optimization problem for cloud providers while considering three properties of the real-world market:1)providers have only incomplete information about the market;2)it is in evolution due to the increasing number of users and decreasing marginal cost of providers:3)it is fully competitive because of providers'and users'revenuedriven *** far as we know,there is no existing work investigating the optimal pricing policies under such realistic *** first propose a comprehensive model for the real-world cloud inarket and formulatc it as a stochastic *** we use the Markov perfect equilibrium(MPE)to describe providers5 optimal *** we decompose the problem of computing the MPE into two subtasks:1)dividing the stochastic game into many normal-formal games and calculating their Nash equilibria,for which we develop an algorithm ensuring to converge,and 2)computing the MPE of the original game,which is efficiently solved by an algorithm combining the Nash equilibria based on a mild *** results show that our algorithms are efficient for computing MPE and the MPE strategy leads to much higher profits for providers compared with existing policies.

关键词： cloud computing Markov perfect equilibrium game theory revenue maximization

Electrical and Optical Properties of InGaN/AlGaN Double Heterostructure Blue Light-Emitting Diodes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2001年第2期18卷 283-285页

作者： SHEN Bo SHI Hong-tao ZHANG rong CHEN Zhi-Zhong ZHENG you-Dou National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing 210093

Electrical and optical properties of InGaN/AlGaN double heterostructure blue light-emitting diodes were *** of the forward bias current-voltage behaviour of the device demonstrated a departure from the Shockley model of a p-n diode,and it was observed that the dominant mechanism of carrier transport across the junction is associated with carrier *** experiments indicated that there was a main emission band around 2.80 eV and a relatively weaker peak at 3.2 eV.A significant blueshift of the optical emission band was observed,which was consistent with the tunnelling character of electrical ***,the degradation in I-V characteristics and the low resistance ohmic short of the device were observed.

关键词： GaN/AlGaN Shockley ohmic

Transcriptional proffling between yellow-and black-seeded Brassica napus reveals molecular modulations on flavonoid and fatty acid content

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2022年第8期21卷 2211-2226页

作者： rong Hao YANG Wen-jing XIE tao WANG Yue WANG Xia-qin JIANG Jin-jin WANG you-ping Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology Yangzhou UniversityYangzhou 225009P.R.China Joint International Research Laboratory of Agriculture and Agri-Product Safety Ministry of Education of ChinaYangzhou UniversityYangzhou 225009P.R.China

Brassica napus is an important cash crop broadly grown for the vegetable and oil ***-seeded *** is preferred by breeders due to its improved oil and protein quality,less pigments and lignin compared with the blackseeded *** study compared the differences in flavonoid and fatty acid contents between yellow rapeseed from the progenies of ***-Sinapis alba somatic hybrids and the black-seeded counterpart using RNA-seq *** HPLC-PDA-ESI(-)/MSanalysis,it was found that phenylpropanoids and flavonoids(i.e.,isorhamnetin,epicatechin,kaempferol,and other derivatives)in yellow seed were significantly lower than those in black *** fatty acid(FA)content in yellow rapeseed was higher than that in black rapeseed due to the variation of C16:0,C18:0,C18:1,C18:2,and C18:3 ***-seq analysis of seeds at four and five weeks after flowering(WAF)indicated that differentially expressed genes(DEGs)between black and yellow rapeseeds were enriched in flavonoid and FA biosynthesis,including BnTT3,BnTT4,BnTT18,and ***,genes related to FA biosynthesis,desaturation and elongation(FAD3,LEC1,FUS3,and LPAT2)in yellow seed were up-regulated compared to those in black seed,while genes involved in beta-oxidation cycle(AIM1 and KAT2)of yellow seed were down-regulated compared to those in black *** DEGs related to the variation of flavonoids,phenylpropanoids,and FAs would help improve the knowledge of yellow seed character in *** and promote rapeseed improvement.

关键词： rapeseed gene expression analysis fatty acid composition phenolic content yellow seed

The Effects of Metal Ions and Secondary Ligands on the Formation of Structures Resulted from Flexible Building Blocks

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2005年第12期24卷 1462-1467页

作者： LI Feng LI tao-Hai CAO rong State Key Laboratory of Structural Chemistr3 Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fujian Fuzhou 350002 China

Two coordination polymers have been synthesized from cpg/4,4＇-bipy/metal ions reaction system, [Zn（cpg）（4,4＇-bipy）0.5（H2O）]·H2O 1 and [Cd（cpg）（4,4＇-bipy）0.5（H2O）2]·H2O 2. X- ray analyses show that different coordination geometries of zinc and cadmium ions lead to similar ladder structures （tetra-for zinc ion and hexa- for cadmium ion）, in which all the flexible cpg molecules exist as single conformations of anti-form.

关键词： hydrothermal synthesis flexible ligand prediction