检索结果-内蒙古大学图书馆

Bicarbonate used as a buffer for controlling nutrient solution pH value during the growth of hydroponic lettuce

International Journal of agricultural and Biological engineering 2024年第3期17卷 59-67页

作者： Mengxue Zhang Wenxin Wang Luming Zhong Fang Ji Dongxian He Key Laboratory of Agricultural Engineering in Structure and Environment of MARA College of Water Resources&Civil EngineeringChina Agricultural UniversityBeijing 100083China

Unstable pH of nutrient solution in hydroponic systems is a major obstacle to *** simplify the management of nutrient solution pH and attenuate negative effects of pH on plant growth,this study investigated the effect of different buffer salt additions on nutrient solution pH,ion uptake,growth and photosynthesis of Yamazaki lettuce,with the equivalent concentrations of macro-element *** results indicated that the pH of nutrient solution was buffered to varying degrees by the 2 mol/L HCO_(3)^(-),1 mol/L HCO_(3)^(-),and 0.33 mol/L HPO_(4)^(2-)The 0.33 mol/L HPO_(4)^(2-)treatment fluctuated most with a pH of 1.74 units,while the addition of HCO_(3)^(-)buffered nutrient solution pH was better,with higher pH values(7.2-7.7).The CK-pH control solution,1 mol/L HCO_(3)^(-)and 0.33 mol/L HPO_(4)^(2-)treatments all promoted the uptake of ion and then the growth of lettuce was better in comparison with the CK-pH no adjustment treatment,while the 2 mol/L HCO_(3)^(-)treatment inhibited K uptake and reduced the availability of Fe,the shoot and root fresh weight of lettuce decreased by 21.3%and 10.1%,*** addition,although the chlorophyll content and net photosynthetic rate under 1 mol/L HCO_(3)^(-)and 0.33 mol/L HPO_(4)^(2-)treatments were significantly lower than the CK-pH control solution treatment,there were no significant differences in leaf length and leaf number of lettuce among them,and shoot fresh weight per plant was 83.09,82.95,and 78.92 g,*** conclusion,adding 1 mol/L HCO_(3)^(-)to the nutrient solution in a single dosage not only buffered the pH of nutrient solution better but also promoted ion uptake,it had no negative effects on the growth,photosynthesis and ion uptake of hydroponic lettuce in comparison with the CK-pH control solution ***,1 mol/L HCO_(3)^(-)can be used as a buffer during the growth of hydroponic lettuce and reduce frequent addition of acids or alkalis,and then simplify the management of nut

关键词： pH buffer nutrient solution hydroponic lettuce growth ion uptake

来源：评论

学校读者我要写书评

暂无评论

Defective NH2-UiO-66 for effective Pb（Ⅱ） removal:Facile fabrication strategy,performances and mechanisms

引用

Progress in Natural Science:Materials International 2024年第2期34卷 420-428页

作者： Meng-Yuan Liu Lu Zhang Yu-Hang Li Chong-Chen Wang Peng Wang Chen Zhao Huifen Fu Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation School of Environment and Energy Engineering Beijing University of Civil Engineering and Architecture

Defective NH2-UiO-66 adsorbent（named as NH2-UiO-66-SD） was successfully fabricated via post-synthesis method with the aid of both sodium carbonate anhydrous（Na2CO3） and diethylenetriaminepentaacetic acid（DTPA）,in which the defective structure was confirmed by various *** as-obtained defective NH2-UiO-66-SD exhibited outstanding Pb（Ⅱ） sorption capacity(172.21 mg g-1) and rapid diffusion rate(29.87mg g-1min-0.5) at room temperature with optimal pH being *** Pb（Ⅱ） sorption behavior was conformed to pseudo-second-order kinetics and Langmuir model,demonstrating that the chemical sorption of the monolayer played a dominant *** well,the thermodynamic parameters like standard Gibbs free energy change ΔG~o(-31.21 kJ mol-1),standard enthalpy change ΔH~o(12.79 kJ-1mol-1) and standard entropy change ΔS~o(146.73J mol-1K-1) revealed that the Pb（Ⅱ） sorption process of NH2-UiO-66-SD was spontaneous,endothermic and ***,the NH2-UiO-66-SD exhibited desirable desorption and recirculation performances（removal efficiencies>85 % in 5 runs） with ideal ***,the Pb（Ⅱ） sorption mechanism of NH2-UiO-66-SD mainly included the electrostatic attractions and coordinative ***,this work offered an intriguing method of fabricating defective NH2-UiO-66 adsorbent,which vastly enhanced adsorption efficiency for toxic metal ions elimination from wastewater.

关键词： NH2-UiO-66 Defect Adsorption Pb(II) Mechanism

来源：评论

学校读者我要写书评

暂无评论

Effects of plug tray cell size on the growth of Atractylodes Chinensis (DC) Koidz seedlings

引用

International Journal of agricultural and Biological engineering 2024年第4期17卷 45-52页

作者： Kaixuan Shi Juwen Liang Fang Ji Dongxian He Key Laboratory of Agricultural Engineering in Structure and Environment of MARA College of Water Resources&Civil EngineeringChina Agricultural UniversityBeijing 100083China

Atractylodes Chinensis(DC)Koidz is a perennial herb often used as a prescription medicine for influenza,to invigorate the spleen and remove *** quality of the herb is determined by the quality of the *** traditional *** seedling production technique has nonuniform seedlings and low *** plug seedling technique was used to produce *** *** study was conducted to determine the growth characteristics of *** seedlings according to the cell size of plug trays and number of days after *** height,stem diameter,rhizome diameter,number of leaves,leaf area,and shoot dry and fresh weight of *** seedlings were significantly higher in the P32-D treatment than in the P72,P50,and P32 treatments,but not significantly different from the P28-D treatment 60 d after *** P28-D treatment resulted in a considerable drop in rhizome fresh weight and healthy seedling index,both of which are key indicators for assessing seedling *** the differences in Pn among treatments were not significantly different,Tr was considerably greater in *** seedlings treated with P32-D and P28-D than in the other three *** P32-D and P28-D treatments had considerably greater potential maximum photochemical efficiency of PSII,quantum yield of photosystem II,photochemical quenching and electron transport rate than the other three *** vitality of *** seedlings was significantly stronger in the P32-D treatment than in the other four treatments,and it was 1.9 times higher than in the P28-D *** soluble protein,soluble sugar,and starch contents of *** seedlings were highest in the P32-D treatment,but the differences among treatments were not ***,EUE,PY and EY were significantly higher in the P32-D treatment than in the other four treatments,being 1.3,1.3,1.4 and 1.4 times higher than in P28-D,*** the other hand,as for the change in the gro

关键词： Atractylodes Chinensis(DC)Koidz plug seedling plug tray cell size

来源：评论

学校读者我要写书评

暂无评论

From ore to MOF: A case of MIL-100(Fe) production from iron ore concentrates

引用

Progress in Natural Science:Materials International 2024年第1期34卷 66-73页

作者： Miao Chang Chiyao Tang Chong-Chen Wang Chen Zhao Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation School of Environment and Energy Engineering Beijing University of Civil Engineering and Architecture

Within this work, iron ore concentrates instead of elemental iron Fe0and iron salts like Fe（NO3）3and FeCl3were selected as iron source to prepare MIL-100（Fe）(labeled as MIL-100（Fe）-ore). The corresponding synthesis cost is reduced to half of the MIL-100（Fe） produced from elemental iron and iron salts. As well, the unreacted iron ore concentrates can be easily separated from the as-prepared MIL-100（Fe）-ore by magnetic to facilitate the purification process, free of the strong acids to wash the residual iron. The as-obtained MIL-100（Fe）-ore with Langmuir surface area up to 2281.6 m2g-1displayed long-term chemical stability. Furthermore, the sorption capacity of MIL-100（Fe）-ore towards malachite green（MG） is up to 522.3 mg g-1at 25℃ and initial pH = 3.2, higher than that of MIL-100（Fe） yielded by conventional hydrothermal process. Finally, the production cost and life cycle assessment of MIL-100（Fe）-ore were compared with other traditional production procedures. The results revealed that our work greatly reduced the synthesis cost and enhanced the environmental sustainability.

关键词： Metal-organic framework Iron ore concentrates Adsorption Life cycle assessment

来源：评论

学校读者我要写书评

暂无评论

Breakthrough of Carbon-Ash Recalcitrance in Hydrochar via Molten Carbonate:engineering Mineral-Rich Biowaste Toward Sustainable Platform Carbon Materials

引用

engineering 2024年第5期36卷 167-177页

作者： Zihan Wang Leli Zhang Yuanhui Zhang Zhidan Liu Laboratory of Environment-Enhancing Energy(E2E) Key Laboratory of Agricultural Engineering in Structure and EnvironmentMinistry of AgricultureCollege of Water Resources and Civil EngineeringChina Agricultural UniversityBeijing 100083China Department of Agricultural and Biological Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA

The function-led design of porous hydrochar from mineral-rich biowaste for environmental applications inevitably suffers from carbon-ash ***,a method to alter the original carbon skeleton with ash remains elusive and hinders the availability of ***,we propose a facile strategy for breaking the rigid structure of carbon-ash coupled hydrochar using phase-tunable molten carbonates.A case system was designed in which livestock manure and NaHCO3 were used to prepare the activated hydrochar,and NH3 served as the target *** to the redox effect,we found that organic fractions significantly advanced the melting temperature of Na2CO3 below 800℃.The Na species steadily broke the carbon-ash interaction as the thermal intensity increased and transformed inorganic constituents to facilitate ash dissolution,rebuilding the hydrochar skeleton with abundant hierarchical channels and active defect *** surface polarity and mesopore distribution collectively governed the five cycles NH3 adsorption attenuation *** hydrochar delivered favorable potential for application with a maximum overall adsorption capacity of 100.49 mg·g^(-1).Integrated spectroscopic characterization and theoretical computations revealed that incorporating NH3 on the carbon surface could transfer electrons to chemisorbed oxygen,which promoted the oxidation of pyridine-N during *** work offers deep insight into the structure function correlation of hydrochar and inspires a more rational design of engineered hydrochar from high-ash biowaste.

关键词： Hydrochar Livestock manure Ammonia adsorption Deashing Oxygen activation

来源：评论

学校读者我要写书评

暂无评论

Effects of high-pressure activated slightly acidic electrolyzed water on cleaning and sterilization of pig transfer vehicles

引用

International Journal of agricultural and Biological engineering 2024年第4期17卷 53-59页

作者： Xuedong Zhao Shengnan Tao Fei Qi Hao Li Zhengxiang Shi Department of Agricultural Structure and Bioenvironmental Engineering College of Water Resources&Civil EngineeringChina Agricultural UniversityBeijing 100083China Key Laboratory of Agricultural Engineering in Structure and Environment Ministry of Agriculture and Rural AffairsBeijing 100083China Beijing Engineering Research Center on Animal Healthy Environment Beijing 100083China

The establishment of biosafety system is of enormous importance to the livestock and poultry production in terms of mitigating the transmission of diseases and implementing regional prevention and control ***,the current sterilization technology presents several drawbacks,including time-consuming procedures,chemical residues,and challenges in treating the sewage after *** this study,a novel cleaning and sterilization method that combines slightly acidic electrolyzed water and high pressure water-jet was *** orthogonal test was conducted to examine the correlation between high-pressure conditions and the various non-structural parameters on the efficacy of sterilization *** a field test,the effectiveness of the technology in cleaning pig transfer vehicles was evaluated by the total plate count and variations of community *** findings revealed that the combination of process parameters,including an available chlorine concentration of 200 mg/L,rinsing pressure of 170 bar,rinsing duration of 10 s,and residence time of 15 min,resulted in a removal rate of colony concentration on the surface of pig transfer vehicles of(96.50±0.91)%.Moreover,it was demonstrated to effectively inhibit a variety of pathogenic *** innovative cleaning system has the potential to replace traditional methods and reduces pollution while saving time and *** introduces a novel approach for sterilization of transportation in livestock and poultry farms as well as the biosafety construction of the animal husbandry.

关键词： slightly acidic electrolyzed water high pressure water-jet sterilization biosafety concentrated animal production

来源：评论

学校读者我要写书评

暂无评论

MIL-100(Fe)-based functional materials for water decontamination: A state of the art review

引用

Progress in Natural Science:Materials International 2023年第4期33卷 386-406页

作者： Hongyu Chu Chong-Chen Wang Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation School of Environment and Energy Engineering Beijing University of Civil Engineering and Architecture

Iron-based metal-organic frameworks(MOFs) have been received extensive attentions over the past years due to the low biotoxicity, multi-function, and wide applications. MIL-100(Fe) bearing unique structure has become the most popular Fe-based MOF up to now, and it is well-recognized as desirable environmental function material,especially for water purification. To provide systematic insight into MIL-100(Fe) for oriented design of novel materials, we review the recent progress and characteristics of MIL-100(Fe)-based materials, including MIL-100(Fe)-based composites, derivatives, and monoliths for water decontamination via adsorption, separation,and advanced oxidation processes(AOPs). Based on existing challenges and limitations discussed in this review,we further propose the future perspectives of MIL-100(Fe)-based materials for sustainable application in water remediation.

关键词： MIL-100(Fe) Water purification Adsorption Separation Advanced oxidation process

来源：评论

学校读者我要写书评

暂无评论

Recovering Ag^(+)with nano-MOF-303 to form Ag/AgCl/MOF-303 photocatalyst:The role of stored Cl^(-)ions

引用

Chinese Chemical Letters 2025年第2期36卷 460-464页

作者： Ming-Yi Sun Lu Zhang Ya Li Chong-Chen Wang Peng Wang Xueying Ren Xiao-Hong Yi Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation School of Environment and Energy EngineeringBeijing University of Civil Engineering and ArchitectureBeijing 100044China

The nano-MOF-303 synthesized by microwave method exhibited efficient adsorption capacity(232 mg/g)toward Ag^(+),in which the adsorption behaviors were fitted by the pseudo-second-order kinetic and the Freundlich isotherm *** outstanding Ag^(+)sorption ability of nano-MOF-303 could be contributed to electrostatic interactions,weak coordination interaction of Ag-N,and Ag Cl precipitates originating from the stored Cl^(-)in *** the adsorbent regeneration,the formed Ag/Ag Cl onto nano-MOF-303 could produce Ag/Ag Cl/MOF-303 as a photocatalyst for sulfamethoxazole degradation under visible *** this work,both the adsorption and photocatalysis mechanisms were clarified,which might provide insight to develop more effective adsorbents for mining the critical resource from the wastewater.

关键词： MOF-303 Silver ions Resource recovery Photocatalyst Mechanism

来源：评论

学校读者我要写书评

暂无评论

Integrated multi-scale approach combining global homogenization and local refinement for multi-field analysis of high-temperature superconducting composite magnets

引用

Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 747-762页

作者： Hanxiao GUO Peifeng GAO Xingzhe WANG Key Laboratory of Mechanics on Western Disaster and Environment of Ministry of Education Key Laboratory of Special Function Materials and Structure Design of Ministry of EducationCollege of Civil Engineering and MechanicsLanzhou UniversityLanzhou 730000China

Second-generation high-temperature superconducting(HTS)conductors,specifically rare earth-barium-copper-oxide(REBCO)coated conductor(CC)tapes,are promising candidates for high-energy and high-field superconducting *** respect to epoxy-impregnated REBCO composite magnets that comprise multilayer components,the thermomechanical characteristics of each component differ considerably under extremely low temperatures and strong electromagnetic *** numerical models include homogenized orthotropic models,which simplify overall field calculation but miss detailed multi-physics aspects,and full refinement(FR)ones that are thorough but computationally ***,we propose an extended multi-scale approach for analyzing the multi-field characteristics of an epoxy-impregnated composite magnet assembled by HTS pancake *** approach combines a global homogenization(GH)scheme based on the homogenized electromagnetic T-A model,a method for solving Maxwell's equations for superconducting materials based on the current vector potential T and the magnetic field vector potential A,and a homogenized orthotropic thermoelastic model to assess the electromagnetic and thermoelastic properties at the macroscopic *** then identify“dangerous regions”at the macroscopic scale and obtain finer details using a local refinement(LR)scheme to capture the responses of each component material in the HTS composite tapes at the mesoscopic *** results of the present GH-LR multi-scale approach agree well with those of the FR scheme and the experimental data in the literature,indicating that the present approach is accurate and *** proposed GH-LR multi-scale approach can serve as a valuable tool for evaluating the risk of failure in large-scale HTS composite magnets.

关键词： epoxy-impregnated high-temperature superconducting(HTS)magnet multi-scale method global homogenization(GH) local refinement(LR) multi-field analysis

来源：评论

学校读者我要写书评

暂无评论

LED supplementary strategy based on hourly light integral for improving the yield and quality of greenhouse strawberries

引用

International Journal of agricultural and Biological engineering 2024年第5期17卷 96-104页

作者： Ruimei Yang Chenhui Qiu Jianfeng Zheng Fang Ji Dongxian He Po Yang Key Laboratory of Agricultural Engineering in Structure and Environment of MARA College of Water Resources&Civil EngineeringChina Agricultural UniversityBeijing 100083China Beijing Lighting Valley Technology Co. Ltd.Beijing 100083China

Supplemental lighting is critical to the growth of greenhouse crops under the environmental conditions of low temperatures combined with weak radiation during the winter and spring *** achieve the essential daily light integral(DLI)for greenhouse crop growth,a supplemental light strategy was proposed based on hourly light integral(HLI).The target HLI was calculated by dividing the target DLI by the duration of light exposure,while the actual HLI was obtained by accumulating the Photosynthetic Photon Flux Density(PPFD)based on real-time ***,the supplemental lighting duration for the next hour was determined by the difference between the target HLI and the actual HLI from all previous ***,the supplementary lighting strategy incorporated maximum values for both PPFD and temperature,and the supplemental light was withheld whenever the actual PPFD or temperature exceeded these *** experiment was conducted on strawberries in a commercial greenhouse,targeting a DLI of 12.6 mol/(m2∙d),with no supplemental lighting as the *** results indicated that LED supplemental lighting based on HLI increased the DLI to approximately10 mol/(m2∙d)and raised the strawberry canopy temperature by 1°C-2°*** to the control treatment,the LED supplemental lighting based on HLI significantly improved the net photosynthetic rate,stem thickness,number of leaves,leaf length,and leaf width of the strawberry ***,the fruit yield per plant,soluble solids content,and sugar-acid ratio in the supplemental lighting treatment increased by 32%,21%,and 33%,***,LED supplemental lighting based on HLI is an effective strategy for improving the yield and quality of greenhouse crop production.

关键词： daily light integral hourly light integral greenhouse strawberry LED supplementary strategy temperature coupling control

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：