Development of Ni_(x)/Mg_(1-x)-MOF-74 for highly efficient CO_(2)/N_(2) separation

To enhance the separation selectivity of Mg-MOF-74 towards CO_(2) in a CO_(2)/N_(2) mixture,a series of Mg-MOF-74 and Ni_(x)/Mg_(1-x)-MOF-74 adsorbents were prepared by solvothermal synthesis in this paper.It was found that the adsorption capacity of Mg-MOF-74 for CO_(2) could be effectively increased by optimizing the amount of acetic acid.On this basis,the bimetal MOF-74 adsorbent was prepared by metal modification.The multi-component dynamic adsorption penetration analysis was utilized to examine the CO_(2) adsorption capacity and CO_(2)/N_(2) selectivity of the diverse adsorbent materials.The results showed that Ni0.11/Mg0.89-MOF-74 showed a CO_(2) adsorption capacity of 7.02 mmol/g under pure CO_(2) atmosphere and had a selectivity of 20.50 for CO_(2)/N_(2) under 15% CO_(2)/85%N_(2) conditions,which was 10.2% and 18.02% higher than that of Mg-MOF-74 respectively.Combining XPS,SEM and N_(2) adsorption-desorption characterization analysis,it was attributed to the effect of the more stable unsaturated metal sites Ni into the Mg-MOF-74 on the pore structure and the synergistic interaction between the two metals.Density Functional Theory(DFT)simulations revealed that the synergistic interaction between modulated the electrostatic potential strength and gradient of the material,which was more favorable for the adsorption of CO_(2) molecules with small diameters and large quadrupole moment.In addition,the Ni0.11/Mg0.89-MOF-74 showed commendable cyclic stability,underscoring its promising potential for practical applications.

Molecular interaction mechanism in the separation of a binary azeotropic system by extractive distillation with ionic liquid

Ionic liquids(ILs)have shown excellent performance in the separation of binary azeotropes through extractive distillation[1].But the role of the ionic liquid in azeotropic system is not well understood.In this paper,COSMO-RS model was applied to screen an appropriate IL to separate the binary azeotrope of ethyl acetate(EA)and ethanol and 1-octyl-3-methylimidazolium tetrafluoroborate([OMIM][BF4])was selected.The Quantum Mechanics(QM)calculations and molecular dynamics(MD)simulation are performed to study the interactions between the solvent molecules and[OMIM][BF4],in order to investigate the separation mechanism at the molecular level.The nature of the interactions is studied through the reduced density gradient(RDG)function and quantum theory of Atom in Molecule(QTAIM).Hydrogen bonds and van der Waals interactions are the key interactions in the complexes.The results of MD simulations indicate that the introduction of ILs has a prominent effect on the interaction between the solvent molecules,especially on reducing the number of hydrogen bonds among the solvent molecules.The radial distribution function(RDF)reveals that the interaction between the cation and solvent molecules will increase while the concentration of ILs increases.This paper provides important information for understanding the role of ILs in the separation of the azeotropic system,which is valuable to the development of new entrainers.

Strain-controlled graphdiyne membrane for CO2/CH4 separation:First-principle and molecular dynamic simulation

Tensile strain of porous membrane materials can broaden their capacity in gas separation.In this work,using van der Waals corrected density functional theory(DFT)and molecular dynamics(MD)simulations,the performance and mechanism of CO2/CH4 separation through strain-oriented graphdiyne(GDY)monolayer were studied by applying lateral strain.It is demonstrated that the CO2 permeance peaks at 1.29×10^6 gas permeation units(GPU)accompanied with CO2/CH4 selectivity of 5.27×10^3 under ultimate strain,both of which are far beyond the Robeson’s limit.Furthermore,the GDY membrane exhibited a decreasing gas diffusion energy barrier and increasing permeance with the increase of applied tensile strain.CO2 molecule tends to reoriented itself vertically to permeate the membrane.Finally,the CO2 permeability decreases with the increase of the temperature from300 K to 500 K due to conserving of rotational freedom,suggesting an abnormal permeance of CO2 in relation to temperature.Our theoretical results suggest that the stretchable GDY monolayer holds great promise to be an excellent candidate for CO2/CH4 separation,owing to its extremely high selectivity and permeability of CO2.

SEPARATION OF THORIUM FROM YTTERBIUM WITH CYANEX272 BY USING A HOLLOW FIBER MEMBRANE EXTRACTOR

The based membrane extraction of Th(IV) and Yb(III) was studied with HBTMPP in heptane. The separation process of Th(IV) and Yb(III) was considered to be a kinetics competition one. The separation for the mixture of Th(IV) and Yb(III) was carried out by successive membrane extraction and stripping simultaneously. The concentration ratio of Th(IV) and Yb(III) is 16.74 in the stripping solution. The recovery of Th(IV) is 71.6%. The purity of Th(IV) is 95.74%. The separation factor of Th(IV) and Yb(III) is 2.52×106, which was obtained by interfacial kinetics.

OSCILLATION FREQUENCY THEORY OF A PIEZOELECTRIC SENSOR INLIQUID PHASE WITH TWO SEPARATED－ELECTRODES

In this paper, an oscillation frequency equation for a pizoelectric sensor with two separated-electrodes is theoretically derived and experimentally verified. The correlatione of the oscillation frequency and the liquid properties are investigated.

Minimum Amount of Extracting Solvent of a Separation of Two Rare Earth Components

A significant development in the theory of countercurrent extraction will be presented in this article. New expressions of the term in countercurrent extraction process analysis, “Adjacent Stage Impurity Ratio” (ASIR), are deduced. Furthermore, based on the term together with mass balance and extraction equilibrium, the conditions where a given countercurrent extraction separation operation can have minimum amounts of both extracting solvent and scrubbing agent solution can be estimated, and the equations of the two minimum amounts can be deduced. It was found that the equations for a two-component separation using a single aqueous or organic feed are exactly the same as they appeared in the theory initially established in 1970s. Unlike its earlier version, the present derivation does not involve feed-stage-composition hypothesis, and also has the advantage of dealing with a double-feed system where both aqueous and organic feeds are simultaneously employed whereas the earlier theory can only analyze a separation using a single aqueous or organic feed.

Division-Algebras/Poincare-Conjecture Correspondence

We briefly describe the importance of division algebras and Poincaré conjecture in both mathematical and physical scenarios. Mathematically, we argue that using the torsion concept one can combine the formalisms of division algebras and Poincaré conjecture. Physically, we show that both formalisms may be the underlying mathematical tools in special relativity and cosmology. Moreover, we explore the possibility that by using the concept of n-qubit system, such conjecture may allow generalization the Hopf maps.

CO_2/N_2 separation using supported ionic liquid membranes with green and cost-effective [Choline][Pro]/PEG200 mixtures

The high price and toxicity of ionic liquids(ILs) have limited the design and application of supported ionic liquid membranes(SILMs) for CO_2 separation in both academic and industrial fields. In this work, [Choline][Pro]/polyethylene glycol 200(PEG200) mixtures were selected to prepare novel SILMs because of their green and costeffective characterization, and the CO_2/N_2 separation with the prepared SILMs was investigated experimentally at temperatures from 308.15 to 343.15 K. The temperature effect on the permeability, solubility and diffusivity of CO_2 was modeled with the Arrhenius equation. A competitive performance of the prepared SILMs was observed with high CO_2 permeability ranged in 343.3–1798.6 barrer and high CO_2/N_2 selectivity from 7.9 to 34.8.It was also found that the CO_2 permeability increased 3 times by decreasing the viscosity of liquids from 370 to38 m Pa·s. In addition, the inherent mechanism behind the significant permeability enhancement was revealed based on the diffusion-reaction theory, i.e. with the addition of PEG200, the overall resistance was substantially decreased and the SILMs process was switched from diffusion-control to reaction-control.

On Separation between Metric Observers in Segal’s Compact Cosmos

A certain class K of GR homogeneous spacetimes is considered. For each pair E, ?of spacetimes from K, ?where conformal transformation g is from . Each E (being ?or its double cover, as a manifold) is interpreted as related to an observer in Segal’s universal cosmos. The definition of separation d between E and ?is based on the integration of the conformal factor of the transformation g. The integration is carried out separately over each region where the conformal factor is no less than 1 (or no greater than 1). Certain properties of ?are proven;examples are considered;and possible directions of further research are indicated.

The Optimum Sowing Time for Plastic-film Corn and the Application of Two Related Theories

There are two main theories, the 'temperature-raising' theory and the 'precipitation-based regulation' theory, which guide the optimum sowing time of the plastic-film corn. The former was applied in the humid or semi-humid ecotope and on irrigated or half-shaded land in the arid and semi-arid ecotopes, while the latter was suitable for the dry-farming land in the semi-arid ecotope. The results of experiments and investigations for many years showed that the corn output was increased by 69.2% when the former theory was applied to guide the optimum sowing time for plastic-film corn in the semi-humid ecotope, and by 60. 0% when the latter theory was applied in the semi-arid ecotope. In the semi-arid ecotope, however, the output was increased only by 15.7% when the former theory was applied, and even dropped by 14.4% when the latter theory was applied.

Quantum Theory of the Wannier Phenomenon

We employ a recently amended Born-Oppenheimer (hereafter shortly BO) approximation [1] to treat inelastic scattering of slow electrons from highly excited Rydberg atoms like e- + He(1s ns)→He-** for n ≫ 1. Along these lines we replace the standard BO set of potentials by an evolution operator. In this way we take a momentum-momentum coupling inadvertently disregarded by BO into account. The BO eigenvalue problem is now replaced by an evolution equation. One eigen-evolution has been identified as Wanner channel. That channel describes the diffraction of electron pairs from a potential ridge. That diffraction causes a phase jump of π/2 in the channel evolution. Moreover we present a new conservative attractive force controlling the motion of the electron pair as a whole in the nuclear field whose potential is given by . The coupling constant g has been calculated. That potential foreign to the standard BO approximation manifests itself by an entirely new series of isolated resonances located slightly below the double ionization threshold. This resonance ensemble compares favorably with experimental data. Further we present an evolution which forces the electron pair to the electrostatically unstable top of the potential ridge. That evolution may be regarded as quantum version of Wannier’s converging trajectory, and manifests itself here as Fresnel distribution.

New Evidence, Conditions, Instruments &Experiments for Gravitational Theories

Two significant findings compel a rethink of physical theories. First, using a 7-billion-year-old gamma-ray burst, Nemiroff (2012) showed that quantum foam could not exists. And second, Solomon (2011) showed that gravitational acceleration is not associated with the gravitating mass, that gravitational acceleration g is determined solely by τ the change in time dilation over a specific height multiplied by c2 or g = τc2. Seeking consistency with Special Theory of Relativity, as means to initiate this rethink, this paper examines 12 inconsistencies in physical theories that manifest from empirical data. The purpose of this examination is to identify how gravitational theories need to change or be explored, to eliminate these 12 inconsistencies. It is then proposed that spacetime is much more sophisticated than just a 4-dimensional continuum. And, that the Universe consists of at least two layers or “kenos” (Greek for vacuous), the 4-dimensional kenos, spacetime (x, y, z, t) and the 3-dimensional kenos, subspace (x, y, z) that are joined at the space coordinates (x, y, z). This explains why electromagnetic waves are transverse, and how probabilities are implemented in Nature. This paper concludes by proposing two new instruments and one test, to facilitate research into gravitational fields, the new torsion-, tension- and stress-free near field gravity probe, the gravity wave telescope, and a non-locality test.

Possible Evolutionary Models in the Initially Hydride Earth Theory

A modern view of the properties of chemical elements has confirmed the theory of the hot origin of the Earth. The next step in developing this theory was the hypothesis of the initial hydride Earth. In this work, we attempted to find additional evidence for this hypothesis and show additional effects that flow from it. The effect of the physical properties of atoms and ions on their behavior during the formation of the Earth was studied. The maximum contribution to the distribution of elements was made by those elements whose content in the original protoplanets of the disk was the maximum. Correlation dependence is obtained, which allows one to calculate the distribution of elements in the protoplanetary disk. It was shown that hydrogen was the main element in the proto substance located in the zone of the Earth’s formation. In this case, various chemical compounds formed, most represented by hydrogen compounds—hydrides. Since the pressure inside the Earth is 375 GPa, this factor forces the chemical compounds to adopt stoichiometry and structure that would not be available in atmospheric conditions. It is shown that many chemical elements at high pressure in a hydrogen medium form simple hydrides and super hydrides—polyhydrides with high hydrogen content. Pressure leads to a higher density of matter inside the planet. Given the possibility of forming polyhydrides, there is the possibility of binding the initially available hydrogen in an amount that can reach 49.3 mole%. Young Earth could contain about 10.7 mass% of hydrogen in hydrides, polyhydrides, and adsorbed form is almost twice higher than previous estimates. This fact additionally confirms the theory of the original hydride Earth. In hydrides, the occurrence of the phenomenon of superconductivity was discovered. Polyhydrides were shown as potential superconductors with a high critical temperature above 200 K. We, based on these data, hypothesized the presence of superconducting properties in the Earth’s core, which explains the presence of a magnetic field in the Earth, as well as the unevenness and instability of this field and the possibility of migration of the Earth’s poles. The fact that the Earth has a hydroid core causes its change in time due to the instability of hydrides. Arranged several possible models of the destruction of the Earth’s core. The calculations showed that both models give close results. These results give predictions that can be measured. The proposed models also made it possible to estimate the initial size of the Earth. Possible ways of further testing the hypothesis of the initial hydride Earth is shown.

Zhao Benshan's Short Sketch in the View of Relevance Theory

In the view of pragmatics, and based on relevance theory, this thesis gives analysis to Zhao Benshan's short sketch via typical cases to find the factors triggering humorous effects, so as to understand the specific pragmatic effect of short sketch words.

考虑绿色属性的改进原子聚类模块划分方法

针对企业传统模块化设计产品制造或使用时资源消耗高、故障率高、不易维护等问题,提出了一种考虑资源利用性、寿命兼容性、可维护性等绿色属性的改进原子聚类模块划分方法。通过构建多重绿色约束矩阵、价矩阵和距离矩阵,计算各部件间库仑力关系进而提出模块划分方案。利用RAHP、CRITIC和VIKOR法等建立综合评价体系,考虑模块平均聚合度、耦合度和成本均衡度等指标,对模块划分方案进行选择和优化。以工业汽轮机企业产品为例进行绿色模块划分,并与传统模块划分方法进行对比。结果表明,改进后的原子聚类模块划分方法有效提升了产品的绿色性能,满足绿色设计需求。

基于网格化和雷达图的建筑抗震设防最优烈度决策模型研究

目前的建筑抗震设防最优烈度研究主要是从经济性或安全性进行考虑,然而合理的建筑抗震设防最优烈度需要综合考虑经济和安全性指标。本文将研究区域进行网格化,结合其周围历史地震数据进行地震危险性分析,以经济性指标和安全性指标作为抗震设防最优烈度评价指标;运用博弈论组合赋权法确定各指标权重,建立基于网格化和雷达图的建筑抗震设防最优烈度决策模型,将该模型运用到四川省崇州市钢混结构和砖混结构的抗震设防研究中。通过对比分析该模型数据发现:钢混结构按8度设防时,相比于6度、7度和9度设防,其抗震设防综合效益分别提升57.2%、29.6%和3.9%;砖混结构按8度设防时,相比于未设防、6度、7度和9度设防的抗震设防综合效益分别提升60.6%、19.2%、2.4%和1.9%。因此,崇州市钢混结构和砖混结构按8度设防时,为最优抗震设防烈度,抗震设防综合效益最佳,验证了该模型的有效性。

扶阳健脾汤-滋阴养胃汤顺势给药和逆势给药对健康大鼠生理指标的影响

目的通过顺势和逆势给药大鼠扶阳健脾汤和滋阴养胃汤的研究来进一步验证中医阴阳分药分时服用方剂学理论,以及评价扶阳健脾汤和滋阴养胃汤的亚急性毒性。方法选取无特定病原体级SD大鼠48只,雌雄各半,按性别、体质量(空腹)排序,采用计算机随机法分为顺势饲喂组、逆势饲喂组、阴阳合药饲喂组和对照组,每组12只。对顺势饲喂组大鼠早上给予滋阴养胃汤颗粒制剂溶液,下午给予扶阳健脾汤颗粒制剂溶液灌胃,逆势饲喂组大鼠给药顺序与顺势饲喂组相反;阴阳合药饲喂组大鼠给予扶阳健脾汤和滋阴养胃汤合药颗粒制剂混合溶液灌胃,分早晚两次给药;给予对照组早晚灌胃等量超纯水,四组大鼠均每周给药5 d,共给药7周。分别于饲喂第1天、第10天、第20天、第30天、第45天时观察各级大鼠的皮肤毛发、行为状态、兴奋程度、激怒反应、睡眠状态、大便状态。分别于饲喂后第1周、第3周、第5周、第7周的周一、三、五测定大鼠采食量和体质量,饲喂7周后检测大鼠血液常规和血生化指标,计算脏器系数。结果饲喂第3周、第5周、第7周,顺势饲喂组日均采食量明显低于对照组;饲喂第5周、第7周,逆势饲喂组体质量明显高于对照组;饲喂7周后,顺势饲喂组和逆势饲喂组的心脏脏器系数明显低于对照组,而顺势饲喂组的脾脏脏器系数明显高于对照组;顺势饲喂组单核细胞计数明显低于对照组,顺势饲喂组和阴阳合药饲喂组的甘油三酯明显低于对照组,顺势饲喂组的血清总胆固醇明显低于对照组,顺势饲喂组、逆势饲喂组、阴阳合药饲喂组的空腹血糖明显低于对照组,顺势饲喂组、逆势饲喂组、阴阳合药饲喂组的肌酐明显高于对照组;顺势饲喂组和阴阳合药饲喂组的白蛋白明显高于对照组。结论顺势给药、逆势给药、混合给药可引起大鼠空腹血糖降低,肌酐增高;此外,顺势给药还可引起大鼠心脏脏器系数、单核细胞计数、甘油三酯、总胆固醇降低,脾脏脏器系数、白蛋白增高,表明顺势给药会促进大鼠的气血运行,有利于减少食物的摄入以及促进大鼠代谢体内的碳水化合物和蛋白质的代谢,从而进一步验证了中医阴阳分药分时服用方剂学理论。

高职院校跨专业组织发展的多维理论视角探析

高职院校跨专业组织是具有“跨界”和“跨专业”特征的产教融合型新形态组织。文章基于分工协作理论、协同创新理论和组织生态理论,从多维视角对高职院校跨专业组织进行深入探讨。借鉴这三个理论有助于准确把握高职院校跨专业组织的内涵、基本特征和发展动向,并为高职教育实践领域构建跨界融合的跨专业组织提供理论指导或理论依据。

农业投资与土地流转价格--基于地租理论视角

在农村土地所有权、承包权、经营权分置的制度安排下,土地流转价格成为全新的地租范畴。本文基于地租理论,以粮食规模经营主体为例审视了农业投资与土地流转价格的关系,并利用2017年与2019年中国农村家庭追踪调查数据(CRHPS)进行实证检验。结果显示,粮食规模经营主体的农业投资提高了土地流转价格;相比于一般性投资,专用性投资的影响效果更为明显。机制分析发现,粮食规模经营主体通过农业投资增加了粮食收入,部分收入以级差地租的形式转化为土地流转价格。进一步地,本文还发现农业投资尤其是一般性投资提高了地租率,表明该投资带来的边际收益更多地被转出方获得。这种利益分配不利于粮食规模经营主体等转入方,可能影响其投资的积极性;相比而言,专用性投资具有长期改良土地、降低土地经营权转出风险的作用,从而使得地租率出现明显下降。本文对于在地租理论框架下调节土地流转价格,实现土地流转的帕累托改进具有重要的政策含义。

数据三权分置制度释论:底层逻辑、法理反思与法律实现

数据产权分置涵括建立数据资源持有权、数据加工使用权、数据产品经营权分置的产权运行机制,这与数据从资源到要素再到产品的价值创造规律高度契合。尽管数据产权与数据财产权存在映射关系,但财产权所构筑的人为排他性,会增加数据流通和利用的成本,对数据价值实现产生相应影响,这也给数据产权分置政策转化为法律规范带来挑战。目前从数据主体视角出发形成的单一产权或二元权利结构,与“数据产权结构性分置”之政策意蕴和方向性策略不相一致。为此,要确保数据确权不偏离政策目标并实现“三权分置”的制度功能,就需要回归到数据客体视角,探索数据价值形态梯次变化的底层逻辑,破解既有数据确权研究中的理论困境,进而对数据资源持有权、数据加工使用权、数据产品经营权的配置提供必要的制度供给。