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Selection of organic Rankine cycle working fluids in the low-temperature waste heat utilization

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Journal of Hydrodynamics 2015年第3期27卷 458-464页

作者： LI Dian-xun ZHANG Shu-sheng WANG gui-hua School of Energy and Power Engineering Shandong University School of Reronautics Shandong Jiaotong University

In the current study, simulations based on the engineering equation solver （EES） software are performed to determine the suitable working fluid for the simple organic Rankine cYcle system in different temperature ranges. Under the condition of various temperatures and a constant thermal power of the flue gas, the influence of different organic working fluids on the efficiency of the subcritical organic Rankine cycle power generation system is studied, and its efficiency and other parameters are compared with those of the regenerator system. It is shown that the efficiency of the subcritical organic Rankine cycle system is the best when the parameters of the working fluid in the expander inlet are in the saturation state. And for the organic Rankine cycle, the R245fa is better than other working fluids and the efficiency of the system reaches up to 10.2% when the flammability, the toxicity, the ozone depletion, the greenhouse effect and other factors of the working fluids are considered. The R60 l a working fluid can be used for the high-temperature heat source, however, because of its high flammability, new working fluid should be investigated. Under the same condition, the efficiency of the organic Rankine cycle power generation system with an internal heat exchanger is higher than that of the simple system without the internal heat exchanger, but the efficiency is related to the properties of the working fluid and the temperature of the heat source.

关键词： Rankine cycle working fluid waste heat heat exchanger low-temperature

Size Dependency of Income Distribution and Its Implications

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Chinese Physics Letters 2011年第3期28卷 228-231页

作者： ZHANG jiang WANG You-gui Department of Systems Science School of ManagementBeijing Normal UniversityBeijing 100875

We systematically study the size dependency of income distributions,*** distribution versus the population of a *** the generalized Lotka--Uolterra model to fit the empirical income data for 1996-2007 in the U.S.A,we find an important parameter A that can scale with aβpower of the size(population)of the *** that *** point out that the size dependency of income distributions,which is a very important property but seldom addressed in previous studies,has two non-trivial implications:(1)the allometric growth pattern,*** power-law relationship between population and GDP in different years,can be mathematically derived from the size-dependent income distributions and also supported by the empirical data;(2)the connection with the anomalous scaling for the probability density function in critical phenomena,since the re-scaled form of the income distributions has asymptotically exactly the same mathematical expression for the limit distribution of the sum of many correlated random variables.

关键词： trivial asymptotically exactly

Dosage Effects of Fadrozole on Growth and Development of Sex-Reversed Genetic Female Chickens

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Journal of Integrative Agriculture 2013年第6期12卷 1049-1053页

作者： YANG Xiu-rong jiang He-sheng ZHENG jiang-xia QU Lu-jiang CHEN Si-rui LI Jun-ying XU gui- yun YANG Ning Department of Animal Genetics and Breeding Guangxi University Department of Animal Genetics and Breeding National Engineering Laboratory for Animal Breeding China Agricultural University

Fadrozole, an aromatase inhibitor, can masculinize genetic female chickens and high-dose decreases the hatchability. Therefore, it is important to study the growth and development of sex-reversed females after hatch. Chick embryos from a population of CAU3 egg-type were treated with different concentrations of Fadrozole prior to the sexual differentiation at E3.0 （st18）. At hatch, the phenotypic sex and genetic sex were identified by vent sexing and genetic diagnosis with CHD1, respectively. Body weight and shank length of sex reversal were tested at 8 and 20 wk, respectively. Testicular development, oviduct and ovarian degeneration were observed and serum concentration of estradiol and testosterone were tested with radioimmunoassay （RIA） at 30 wk. The results showed that body weight and shank length of sex- reversed females were not significantly different between low-dose groups （0.1, 0.3, and 0.5 mg for F1, F2, and F3, respectively） and high-dose groups （1.0 and 1.3 mg for F4 and F5, respectively）（P〉0.05）. Left and right testes or ovotestes in F2, F3, F4, and F5 groups were heavier than that of in F1 group （P〈0.05）. While the gonad weight of treatment groups were less than that in male control （P〈0.05）, oviduct weight in F2, F3, F4, and F5 groups were significant differences compared with female control and F1 group （P〈0.05）. Egg number from onset of laying egg to 30 wk in F4 and F5 groups were less than in female control, F1 and F2 groups （P〈0.05）. Serum testosterone level in F5 group was significant higher compared with female control, F1, F2, F3, and F4 groups （P〈0.05）, but significant lower compared with male control （P〈0.05）. While concentration of serum estradiol in F5 group was significant lower compared with female control, F1, F2, and F4 groups （P〈0.05）. In conclusion, the concentration of Fadrozole do not affect postnatal growth of sex-reversed female chicken and the degree of sex-reversed females elevate with the increase of Fadrozole concentration at

关键词： chicken Fadrozole growth and development reproductive system sex reversals

Neighbor Sum Distinguishing Total Choice Number of Planar Graphs without 6-cycles

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Acta Mathematica Sinica,English Series 2020年第12期36卷 1417-1428页

作者： Dong Han ZHANG You LU sheng gui ZHANG School of Mathematics and Statistics and Xi'an-Budapest Joint Research Center for Combinatorics Northwestern Polytechnical UniversityXi'an 710129P.R.China College of Mathematics and Computer Applications Shangluo UniversityShangluo 726000P.R.China

Pilsniak and Wozniak put forward the concept of neighbor sum distinguishing(NSD)total coloring and conjectured that any graph with maximum degreeΔadmits an NSD total(Δ+3)-coloring in *** 2016,Qu et *** that the list version of the conjecture holds for any planar graph withΔ≥*** this paper,we prove that any planar graph withΔ≥7 but without 6-cycles satisfies the list version of the conjecture.

关键词： Planar graphs neighbor sum distinguishing total choice number Combinatorial Nullstellensatz

The circuit design and optimization of quantum multiplier and divider

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Science China(Physics,Mechanics & Astronomy) 2022年第6期65卷 11-25页

作者： Hai-sheng Li Ping Fan Haiying Xia gui-Lu Long College of Electronic Engineering Guangxi Normal UniversityGuilin 541004China College of Information Engineering East China JiaoTong UniversityNanchang 330013China Department of Physics Tsinghua UniversityBeijing 100084China State Key Laboratory of Low-Dimensional Quantum Physics Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Beijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China

A fault-tolerant circuit is required for robust quantum computing in the presence of ***+T circuits are widely used in fault-tolerant *** a result,reducing T-depth,T-count,and circuit width has emerged as important optimization goals.A measure-and-fixup approach yields the best T-count for arithmetic operations,but it requires quantum *** paper proposes approximate Toffoli,TR,Peres,and Fredkin gates with optimized T-depth and *** that,we implement basic arithmetic operations such as quantum modular adder and subtractor using approximate gates that do not require quantum ***,taking into account the circuit width,T-depth,and T-count,we design and optimize the circuits of two multipliers and a *** to the comparative analysis,the proposed multiplier and divider circuits have lower circuit width,T-depth,and T-count than the current works that do not use the measure-and-fixup ***,the proposed second multiplier produces approximately 77%T-depth,60%T-count,and 25%width reductions when compared to the existing multipliers without quantum measurements.

关键词： quantum multiplier quantum divider quantum fault-tolerant circuit quantum computing

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Flow fields and packing states in the discharge flow of noncircular particles-A SIPHPM simulation

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Particuology 2017年第6期15卷 10-21页

作者： Nan gui Xingtuan Yang Jiyuan Tu shengyao jiang Institute of Nuclear and New Energy Technology. Collaborative Innovation Center of Advanced Nuclear Energy Technology. Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education. Tsinghua University Beijing 100084 China School of Engineering RMIT University. Melbourne VIC 3083. Australia

Although the discharge flow of spherical materials has been extensively explored, the effect of particle shape on discharge is still poorly understood. The present work explores the two-dimensional discharge flow fields of noncircular particles using the soft-sphere-imbedded pseudo-hard particle model method. Rectangular particles having different aspect ratios （Ra = 1, 1.5, 2-5） and regular polygonal particles hav- ing different numbers of sides （Ns = 3-8, 10） are discharged through hopper beds having different orifice widths （Di = 40, 70.77, 99.13, 125.74, 151.13 mm）. The discharge rates of differently shaped particles in different beds are consistent with Beverloo＇s relation. Moreover, the flow fields are computed and eval- uated to study the effects of Ra, Ns, and Di on particle discharge. The characteristics of particle-particle connections in the discharge process are evaluated according to the temporal evolution and spatial dis- tribution of the contact points. Additionally, the effect of the initial packing on the discharge profile is investigated. The findings help clarify the discharge of noncircular particles.

关键词： Non-spherical Discharge flow Hopper Particle Discrete element method

Numerical simulation of tetrahedral particle mixing and motion in rotating drums

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Particuology 2018年第4期16卷 1-11页

作者： Nan gui Xingtuan Yang Jiyuan Tu shengyao jiang Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Aclvanced Nuclear Energy Technology Key Laboratory of Advancecl Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing 100084 China School of Engineering RMIT University Melbourne VIC 3083 Australia

A regular tetrahedron is the simplest three-dimensional structure and has the largest non-sphericity. Mixing of tetrahedral particles in a thin drum mixer was studied by the soft-sphere-imbedded pseudo- hard particle model and compared with that of spherical particles. The two particle types were simulated with different rotation speeds and drum filling levels. The Lacey mixing index and Shannon information entropy were used to explore the effects of sphericity on the mixing and motion of particles. Moreover, the probability density functions and mean values and variances of motion velocities, including translational and rotational, were computed to quantify the differences between the motion features of tetrahedra and spheres. We found that the flow regime depended on the particle shape in addition to the rotation speed and filling level of the drum. The mixing of tetrahedral particles was better than that of spherical particles in the rolling and cascading regimes at a high filling level, whereas it may be poorer when the filling level was low. The Shannon information entropy is better than the Lacey mixing index to evaluate mixing because it can reflect the real change of flow regime from the cataracting to the centrifugal regime, whereas the mixing index cannot.

关键词： Tetrahedron Non-spherical particle Mixing Drum Flow regime Discrete element method

Exploration of Strong Metal-Support Interaction in Heterogeneous Catalysts by in situ Transmission Electron Microscopy

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Chinese Journal of Chemistry 2024年第9期42卷 1004-1008页

作者： Yongjun jiang sheng Dai Key Laboratoryfor Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Institute of Fine ChemicalsSchool of Chemistry&Molecular EngineeringEast China Universityof Science and TechnologyShanghai 200237China

The phenomenon of strong metal-support interaction(SMSI)observed in supported metal catalysts,usually accompanied by the formation of the encapsulation layer on metal nanoparticles,has attracted extensive research attention due to its significance in heterogeneous ***,great progress has been made in recent years in investigating SMSI by in situ transmission electron microscopy(TEM),along with an enhanced comprehension of the underlying mechanisms governing SMSI *** emerging topic summarizes recent progress utilizing in situ TEM to study the interaction between metal and support and the relationship between the structure and performance of the supported catalyst under reaction conditions.A brief perspective about the use of in situ TEM for further study of SMSI is also presented,showing prospects in this field that will stimulate further upsurging research in promoting the catalytic efficiency of supported catalysts.

关键词： Heterogeneous catalysis In situ TEM Strong metal-support interaction Structure changes Interfaces Structural evolution

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经皮血管内支架术治疗颈动脉狭窄九例报告

中华神经医学杂志 2005年第11期4卷 1157-1159页

作者：姜桂生曲怀谦贾秀华梁建华许建新王兴臣山东省聊城市人民医院神经内科 252000

目的介绍并探讨支架治疗颈动脉病变的程序及有效性、安全性。方法2004年1月至2005年6月颈动脉狭窄大于或等于70%(NASCET标准)的患者9例行11枚自膨胀支架置入治疗,皆应用保护伞,于围手术期进行抗血小板治疗,并行全脑血管造影及颈部超声检... 详细信息

目的介绍并探讨支架治疗颈动脉病变的程序及有效性、安全性。方法2004年1月至2005年6月颈动脉狭窄大于或等于70%(NASCET标准)的患者9例行11枚自膨胀支架置入治疗,皆应用保护伞,于围手术期进行抗血小板治疗,并行全脑血管造影及颈部超声检查,临床随访5.5月(1￣12月)。结果9例手术操作完全成功,术后残余狭窄小于20%,无死亡病例;无症状脑梗死1例;2例术后出现低血压,心动过缓,静脉持续给药24h后恢复正常。结论应用支架内置入是治疗颈动脉狭窄的一种可行、安全、有效的方法。

关键词：颈动脉狭窄颈动脉支架脑梗死血管内治疗