检索结果-南通市图书馆

Synthesis of NaY zeolite from a submolten depolymerized perlite:alkalinity effect and crystallization kinetics

Chinese Journal of Chemical Engineering 2024年第6期70卷 130-138页

作者： Yanli Qu Peng Dong Li Yang Yuanyuan Yue Haoliang Wang Jingcai Cheng Chao Yang CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Petroleum Molecular&Process EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100190China Qingyuan Innovation Laboratory Quanzhou 362801China National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou UniversityFuzhou 350108China

NaY zeolites are synthesized using submolten salt depolymerized natural perlite mineral as the main silica and alumina sources in a 0.94 L stirred *** of alkalinity ranging from 0.38 to 0.55(n(Na_(2)O)/n(SiO_(2)))on the relative crystallinity,textural properties and crystallization kinetics were *** results show that alkalinity exerts a nonmonotonic influence on the relative crystallinity and textural properties,which exhibit a maximum at the alkalinity of *** nucleation kinetics are studied by fitting the experimental data of relative crystallinity with the Gualtieri *** is shown that the nucleation rate constant increases with increasing alkalinity,while the duration period of nucleation decreases with increasing *** n(Na_(2)O)/n(SiO_(2))ratios ranging from 0.38 to 0.55,the as-synthesized NaY zeolites exhibit narrower crystal size distributions with the increase in *** growth rates determined from the variations of average crystal size with time are 51.09,157.50,46.17 and 24.75 nm·h^(-1),*** is found that the larger average crystal sizes at the alkalinity of 0.38 and 0.43 are attributed to the dominant role of crystal growth over ***,the combined action of prominent crystal growth and the longer duration periods of nucleation at the alkalinity of 0.38 and 0.43 results in broader crystal size *** findings demonstrate that control of the properties of NaY zeolite and the crystallization kinetics can be achieved by conducting the crystallization process in an appropriate range of alkalinity of the reaction mixture.

关键词： NaY zeolite Submolten salt depolymerized perlite alkalinity Crystallization kinetics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

New insight into scale inhibition during tea brewing: Ca^(2+)/Mg^(2+) complexing and alkalinity consumption

引用

Journal of Environmental Sciences 2023年第2期124卷 901-914页

作者： Linjun Li Jinsuo Lu Heliang Pang Zhiqiang Zhang Jing Yang Pengpeng Li Xiaoyu Yan Miaomiao Fan School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Shaanxi Key Laboratory of Environmental Engineering Xi’an University of Architecture and TechnologyXi’an 710055China State Key Laboratory of Green Building in West China Xi’an University of Architecture and TechnologyXi’an 710055China

Scale not only affects the taste and color ofwater,but also increases the risks of osteoporosis and cardiovascular diseases associated with drinking *** a popular beverage,tea is rich many substances that have considerable potential for scale inhibition,including protein,tea polyphenols and organic *** this study,the effect of tea brewing on scale formationwas *** was found that the proteins,catechins and organic acids in tea leaves could be released when the green tea was brewed in water with sufficient hardness and *** tea-released protein was able to provide carboxyl groups to chelate with calcium ions(Ca^(2+)),preventing the Ca^(2+)from reacting with the carbonate ions(CO_(3)^(2-)).The B rings of catechins were another important structure in the complexation of Ca^(2+)and magnesium ions(Mg2+).The carboxyl and hydroxyl groups on the organic acids was able to form fivemembered chelating rings with Ca^(2+)and Mg^(2+),resulting in a significant decrease in Ca^(2+)from 100.0 to 60.0 mg/***,the hydrogen ions(H^(+))provided by the organic acids consumed and decreased the alkalinity of the water from 250.0 to 131.4 mg/L,leading to a remarkable reduction in pH from 8.93 to *** further prevented the bicarbonate(HCO_(3)^(-))from producing CO_(3)^(2−)when the water was *** reaction of the tea constituents with the hardness and alkalinity inhibited the formation of scale,leading to a significant decrease in turbidity from 10.6 to 1.4 ***,this study provides information to help build towards an understanding of the scale inhibition properties of tea and the prospects of tea for anti-scaling in industrial applications.

关键词： Scale inhibition Tea brewing Chelation Hardness alkalinity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Germination and Photosynthetic Responses to Salinity and alkalinity in Avicenna marina Propagules

引用

Phyton-International Journal of Experimental Botany 2022年第5期91卷 1015-1026页

作者： Abdallah Atia Ahmed Abdallah Hussain Barhoumi Zouhaier Department of Biology College of Arts and Science Mahayel AsirKing Khalid UniversityAbha61413Saudi Arabia Research Unit Nutrition and Nitrogen Metabolism and Stress ProteinDepartment of BiologyFaculty of Sciences of TunisCampus Universitaire El Manar ITunis1068Tunisia Department of Biology King Khalid UniversityAbha61413Saudi Arabia Faculty of Science Abu HarazGezira UniversityWed Medani21111Sudan Laboratory of Extremophile Plants Biotechnology Center of Borj CedriaUniversity Tunis El ManarTunis1068Tunisia

Avicenna marina(Forssk.)Vierh is a halophytic *** reproductive unit is green and has photosynthetic *** are naturally exposed to fluctuations in some abiotic factors at the soil surface,including salinity and *** objective of this study was to determine the effects of two salts including NaCl and NaHCO_(3)on germination processes and discuss the relationships between cotyledon photosynthesis and embryo axis growth in *** *** propagules came from Al Birk,located on the shoreline of the Saudi Red *** results showed that the studied salts did not affect neither the final germination percentage nor the embryo axis ***,rooting and root growth were delayed by both salts at 300 mM and were strongly inhibited by 600 mM NaHCO_(3).Both NaCl and NaHCO_(3)reduced the photosynthetic *** two salts did not affect the other photosynthetic parameters,including stomatal conductance,net transpiration,and intercellular CO_(2).Thereafter,the reduction in net photosynthesis was not related to any limitation of stomatal *** early germination phase was independent of cotyledon photosynthesis,whereas rooting and root growth may be limited by reduced photosynthesis under NaCl and NaHCO_(3).

关键词： Avicenna marina propagules cotyledons embryo growth germination photosynthesis alkalinity salinity

来源：

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

Effects of salinity and alkalinity on fatty acids, free amino acids and related substance anabolic metabolism of Nile tilapia

引用

Aquaculture and Fisheries 2022年第4期7卷 389-395页

作者： Yamei Cheng Jinliang Zhao Christian Larbi Ayisi Xiaoying Cao Key Laboratory of Freshwater Fishery Germplasm Resources Ministry of Agriculture and Rural AffairsShanghai Ocean UniversityShanghai201306China Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding Shanghai Ocean UniversityShanghai201306China Center for Research on Environmental Ecology and Fish Nutrition of the Ministry of Agriculture and Rural Affairs Shanghai Ocean UniversityShanghai201306China Department of Fisheries and Aquatic Resources Management Faculty of Natural Resources and EnvironmentUniversity for Development StudiesTamaleGhana

A 56-day experiment was conducted to investigate the effects of ambient salinity and alkalinity on fatty acids,free amino acids and related anabolic metabolisms of Nile *** fatty acid and free amino acid contents in the muscle of tilapia cultured in saline water(SW),alkaline water(AW),saline-alkaline water(SAW)and fresh water(FW)conditions were analyzed and *** mRNA levels and enzymatic activities of fatty acyl desaturase(FADS2),elongation of very long-chain fatty acids(ELOVL5),Δ1-pyrroline-5-carboxylate synthase(P5CS),ornithine-δ-aminotransferase(δ-OAT),and proline dehydrogenase(PDH)were also *** contents of saturated and monounsaturated fatty acids were significantly higher in the AW and SAW groups than those in the SW group,and those of eicosapentaenoic acid(EPA)and docosahexaenoic acid(DHA)were the highest in the SAW *** contents of flavor amino acids in the SAW and AW groups were significantly higher than that in the SW group,and that of proline in the SW,AW,and SAW groups was 3.58-,4.11-,and 4.15-times higher than that in the FW *** mRNA levels and enzyme activities of FADS 2,ELOVL5,PDH and P5CS were found to differ among the different *** results suggested that ambient salinity and alkalinity could effectively improve flesh quality of tilapia by regulating lipid and proline metabolism pathways.

关键词： Nile tilapia Nutritional value Flavor Metabolism Salinity alkalinity

来源：

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

Effect of alkalinity on nitrite accumulation in treatment of coal chemical industry wastewater using moving bed biofilm reactor

引用

Journal of Environmental Sciences 2014年第5期26卷 1014-1022页

作者： Baolin Hou Hongjun Han Shengyong Jia Haifeng Zhuang Qian Zhao Peng Xu State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology

Nitrogen removal via nitrite （the nitrite pathway） is more suitable for carbon-limited industrial wastewater. Partial nitrification to nitrite is the primary step to achieve nitrogen removal via nitrite. The effect of alkalinity on nitrite accumulation in a continuous process was investigated by progressively increasing the alkalinity dosage ratio （amount of alkalinity to ammonia ratio, mol/mol）. There is a close relationship among alkalinity, pH and the state of matter present in aqueous solution. When alkalinity was insufficient （compared to the theoretical alkalinity amount）, ammonia removal efficiency increased first and then decreased at each alkalinity dosage ratio, with an abrupt removal efficiency peak. Generally, ammonia removal efficiency rose with increasing alkalinity dosage ratio. Ammonia removal efficiency reached to 88% from 23% when alkalinity addition was sufficient. Nitrite accumulation could be achieved by inhibiting nitrite oxidizing bacteria （NOB） by free ammonia （FA） in the early period and free nitrous acid in the later period of nitrification when alkalinity was not adequate. Only FA worked to inhibit the activity of NOB when alkalinity addition was sufficient.

关键词： alkalinity nitritation coal chemical industry wastewater moving bed biofilm reactor

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impacts of alkalinity Drops on Shifting of Functional Sulfate-Reducers in a Sulfate-Reducing Bioreactor Characterized by FISH

引用

Chinese Journal of Chemical Engineering 2007年第2期15卷 276-280页

作者：赵阳国王爱杰任南琪赵秋实 ZADSAR Maryam School of Municipal and Environmental Engineering Harbin Institute of Technology

alkalinity is one of the most important parameters that influence microbial metabolism and activity during sulfate-laden wastewater biological treatment. To comprehensively understand the structure and dynamics of functional microbial community under alkalinity changes in sulfate-reducing continuous stirred tank reactor （CSTR）, fluorescent in situ hybridization （FISH） technique was selected for qualitative and semi-quantitative analysis of functional microbial compositions in activated sludge. During 93d of bioreactor operation, the influent alkalinity was adjusted by adding sodium bicarbonate from 4000mg·L^-1 down to 3000mg·L^-1, then to 1500mg·L^-1, whereas other parameters, such as the loading rates of chenucal oxygen demand （COD） and sulfate （SO4^2-）, hydraulic retention time （HRT）, and pH value, were continuously maintained at 24g·L^-1·d^-1 and 4.8g·L^-1·d^-1, 10h,and about 6.7, respectively. Sludge samples were collected during diflerent alkalinity levels, and total Bacteria, tlae sulfate-reducing bacteria （SRB）, and four SRB genera were demonstrated with 16S ribosomal .RNA-targeted oligonucleotide probes. The results indicated that bioreactor started-up successfully in 30d. The two instances ot drop in alkalinity resulted in the fluctuation of sulfate removal rate. The diversity of SRB community showed significant shift, and the alteration of microbial community directly resulted in the corresponding statuses of bioreactor. The dominant genera during the bioreactor start-up and alkalinity drops were Desulfovibrio, Desulfobacter, Desulfovibrio, Desulfobacter, and Desulfovibrio, respectively. In addition, the acetotrophic SRB sutterecl more trom me reduction of alkalinity than the non-acetotrophic SRB. This strategy can present the functional microbial community structure during start-up and alkalinity drop stages, and provides a powerful theoretical guideline for optimization and adjustment of bioreactor, as well.

关键词： alkalinity sulfate-reducing bacterium fluorescent in situ hybridization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of initial alkalinity on the hydration of steel slag

引用

Science China(Technological Sciences) 2012年第12期55卷 3378-3387页

作者： WANG Qiang YANG JianWei YAN PeiYu Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department o(Civil Engineering Tsinghua UniversityBeijing 100084China

The influences of different alkaline conditions on the kinds and morphologies of steel slag＇s hydration products, Ca（OH）2 con- tent of hydration products, pore stiucture of hardened paste, non-evaporable water content of hydration products, and strength of steel slag mortar were investigated by changing the initial alkalinity of the hydration condition of steel slag. The results showed that increasing the initial alkalinity of hydration condition can promote the early hydration of steel slag＇s active com- ponents （e,g., C2S, C3S, and C12A7）, but it has little influence on their late-age hydration degree. The hydration degree of non-active components （e.g., RO phase and Fe304） of steel slag is very low even under strong alkaline condition with pH value of 13.8. The excitation effect of alkaline condition on the early hydration of steel slag is more obvious with the increase of pH value, but the kinds of steel slag＇s hydration products are not influenced by changing the alkaline condition. The amount of steel slag＇s hydration products is limited, so the strength of alkali-activated steel slag mortar is very low though the strong al- kaline condition significantly promotes the early hydration of steel slag. Steel slag is not an ideal raw material for alka- li-activated cementitious material.

关键词： steel slag alkalinity hydration cementitious material

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Simulation and Prediction of alkalinity in Sintering Process Based on Grey Least Squares Support Vector Machine

引用

Journal of Iron and Steel Research International 2009年第5期16卷 1-6页

作者： SONG Qiang WANG Ai-min Mechanical Engineering Department Anyang Institute of Technology Anyang 455000 Henan China Computer and Information Engineering College Anyang Normal University Anyang 455000 Henan China

The prediction of the alkalinity is difficult during the sintering process. Whether or not the level of the alkalinity of sintering process is successful is directly related to the quality of sinter. There is no very good method for predicting the alkalinity by now owing to the high complexity, high nonlinearity, strong coupling, high time delay, and etc. Therefore, a new technique, the grey squares support machine, was introduced. The grey support vector machine model of the alkalinity enabled the development of new equation and algorithm to predict the alkalinity. During modelling, the fluctuation of data sequence was weakened by the grey theory and the support vector machine was capable of processing nonlinear adaptable information, and the grey support vector machine has a combination of those advantages. The results revealed that the alkalinity of sinter could be accurately predicted using this model by reference to small sample and information. The experimental results showed that the grey support vector machine model was effective and practical owing to the advantages of high precision, less samples required, and simple calculation.

关键词： alkalinity sinter grey least squares support vector machine prediction sintering process grey model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Online measurement of alkalinity in anaerobic co-digestion using linear regression method

引用

International Journal of Agricultural and Biological Engineering 2017年第1期10卷 176-183页

作者： Bai Xue Li Zifu Wang Xuemei He Xi Cheng Shikun Bai Xiaofeng Gao Ruiling School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants Beijing 100083China International Science and Technology Cooperation Base for Environmental and Energy Technology of MOST Beijing 100083China

alkalinity is a reliable indicator of process stability in anaerobic digestion *** alkalinity(TA)and partial alkalinity(PA)are usually monitored offline as indicators for the status of anaerobic digestion *** order to online monitor TA and PA,the linear regression method was used as estimator to predict alkalinity via software sensor ***,namely,pH,oxidation and reduction potential(ORP),and electrical conductivity(EC),were used as input *** was the most significant parameter with TA and *** linear regression(MLR)models and simple linear regression models with EC were constructed to predict TA and PA in anaerobic co-digestion *** the basis of the evaluation of prediction accuracy,the applications of linear regression models were better for monitoring PA than *** models provided higher accuracy for alkalinity prediction than simple linear regression *** two MLR models based on single-phase anaerobic digestion system were also feasible to predict TA in anaerobic co-digestion ***,the accuracy of these models should be improved by calibrating for broad applications of linear regression method in online alkalinity measurement.

关键词： anaerobic digestion alkalinity online measurement model linear regression

来源：

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

Effects of Soil Salinity and alkalinity on Grain Quality of Tolerant,Semi-Tolerant and Sensitive Rice Genotypes

引用

Rice science 2013年第4期20卷 284-291页

作者： P.SUREKHA RAO B.MISHRA S.R.GUPTA Central Soil Salinity Research Institute Kurukshetra University

Soil salinity and alkalinity adversely affects the productivity and grain quality of rice. The grain quality of 19 rice genotypes characterized as salt tolerant （T）, semi-tolerant （ST） and sensitive （S） was assessed in lysimeters containing saline and highly alkaline soils. Head rice recovery was reduced by salinity stress whereas it was not affected by alkalinity stress. The ratio of length to width （grain dimensions） was significantly reduced in the T genotype even at low electrical conductivity （EC, 4 mS/cm） and alkalinity （pH 9.5）, whereas in the ST genotype, it was significantly reduced at high salinity （EC 8 mS/cm）. There was no significant effect of any levels of salinity or alkalinity on grain dimensions in the S genotype. Amylose content was significantly reduced in T and ST groups even at low EC （4 mS/cm） and alkalinity （pH 9.5） and the effect in the S genotype was only at high salinity. Starch content showed significant reduction at high salinity and alkalinity （EC 8 mS/cm and pH 9.8） in the T and ST genotypes and no significant effect was observed in the S genotype. The effect of both levels of salinity （EC 4 and 8 mS/cm） and high alkalinity （pH 9.8） on gel consistency was observed only in the S genotype. The tolerant genotypes IR36 under high salinity, and CSIR10 and CSR11 under alkali stress showed less reduction in amylose content. The T genotype BR4-10, and ST genotypes CSR30, CSR29 and CSR13 showed better gel consistency under saline and alkali stress. Amylose content was affected even at low salinity stress and thus important to be considered in breeding rice for salt tolerance. Overall, the grain quality of T and ST genotypes was less affected by saline and alkali stress compared to S ones.

关键词： alkalinity amylose content electrical conductivity gel consistency rice salinity starch content

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：