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Investigation on catalytic distillation for ethyl acetate production with different catalytic packing structures

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Chinese Journal of Chemical Engineering 2023年第1期53卷 63-72页

作者： zhiwei Wang Yu zhang zhi zhang Daowei Zhou zhikai Cao Yong Sha Department of Chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

The catalytic packing is the core component of the catalytic distillation,and how the catalyst exists in the packing has significant influence on the *** investigate the effect of catalyst packings on the catalytic distillation process,the classical ethyl acetate reactive distillation system was utilized,and a supported catalytic packing(SCP)was prepared in comparison with the conventional tea-bag catalytic packing(TBP).Laboratory scale experiments showed that the ethyl acetate conversion of the SCP was superior to the TBP at a low catalyst *** effects of reaction kinetics,mass transfer performance and actual catalytic efficiency of the packings on this process were regarded as reasons and studied by combining the experiments and numerical *** suggested that the relatively immediate“in-situ separation”caused by the rapid reaction kinetics and better mass transfer performance of SCP may be a main reason for the difference of the conversion.

关键词： Catalytic packing Ethyl acetate Catalytic distillation Mass transfer Esterification Reaction kinetics

Prognostic value of red blood cell distribution width for severe acute pancreatitis

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World Journal of Gastroenterology 2019年第32期25卷 4739-4748页

作者： Fang-Xiao zhang zhi-Liang Li zhi-Dan zhang Xiao-Chun Ma Department of Critical Care Medicine First Affiliated Hospital of China Medical University

BACKGROUND Severe acute pancreatitis(SAP)is a common condition in the intensive care unit(ICU)and has a high *** evaluation of the severity and prognosis is very important for SAP ***,red blood cell distribution(RDW)was associated with mortality of sepsis patients and could be used as a predictor of ***,RDW may be associated with the prognosis of SAP patients and be used as a prognostic indicator for SAP *** To investigate the prognostic value of RDW for SAP *** We retrospectively enrolled SAP patients admitted to the ICU of the First Affiliated Hospital of China Medical University from June 2015 to June *** to the prognosis at 90 d,SAP patients were divided into a survival group and a non-survival *** was extracted from a routine blood *** parameters and RDW were recorded and compared between the two *** receiver operator characteristic(ROC)curve was constructed and Cox regression analysis was performed to investigate the prognostic value of RDW for SAP *** In this retrospective cohort study,42 SAP patients were enrolled,of whom 22 survived(survival group)and 20 died(non-survival group).The baseline parameters were comparable between the two *** coefficient of variation of RDW(RDW-CV),standard deviation of RDW(RDW-SD),Acute Physiology and Chronic Health Evaluation II(APACHE II)score,and Sequential Organ Failure Assessment(SOFA)score were significantly higher in the non-survival group than in the survival group(P<0.05).The RDW-CV and RDW-SD were significantly correlated with the APACHE II score and SOFA score,*** areas under the ROC curves(AUCs)of RDW-CV and RDW-SD were all greater than those of the APACHE II score and SOFA score,among which,the AUC of RDW-SD was the *** results demonstrated that RDW had better prognostic value for predicting the mortality of SAP *** the RDW-SD was greater than 45.5,the sensitivity f

关键词： Red blood cell distribution width Severe acute pancreatitis Prognosis Acute Physiology and Chronic Health Evaluation II score Sequential Organ Failure Assessment score

Theoretical Investigation for Unexpected Transition Metal-π Interaction Enhanced Fluorescence in Cu-π-diborene

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Chinese Journal of Structural Chemistry 2020年第6期39卷 1126-1134页

作者： zhang zhi-Yong zhang Zhong-zhi LUO Yi-Jing zhang Guang-Qing Laboratory of Heavy Oil Processing College of Chemical Engineering and EnvironmentChina University of PetroleumBeijing 102249China School of Mechanical Materials&Mechatronic EngineeringUniversity of WollongongWollongong NSW2S22Australia

Unexpected transition metal(TM)-π interaction enhanced fluorescence in Cu-π-diborene complexes is a novel phenomenon compared with other metal enhanced fluorescence. In order to discover the mechanism, theoretical investigation was carried out for Cu-π-diborene as well as diborene. Simulation results show the main decay method in diborene and Cu-π-diborene are internal conversion(IC) and fluorescence(FL), respectively. TM-π interaction leads to larger HOMO-LUMO gap of Cu-π-diborene than that of the free diborene, which results in lower IC rates and makes them smaller than the FL rates. At the same time, ISC rates are always smaller than IC and FL rates, which cause enhanced fluorescence of Cu-π-diborene. More interestingly, even though Cu-π-diborene shows enhanced fluorescence, intersystem crossing(ISC) in Cu-π-diborene is enhanced from diborene. The theoretical analysis shows the competition among IC, FL and ISC is the key factor for TM-π interactions enhanced fluorescence, which also shows that cation-π complexes have potential to be used as luminescent probes.

关键词： boron-boron double bond transition metal-interaction fluorescence quantum yield

Approximation Randomized Strategy-Proof Mechanisms in Obnoxious Facility Game withWeighted Agents

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Journal of the Operations Research Society of China 2016年第3期4卷 357-370页

作者： Lan Xiao Xiao-zhi zhang School of sciences Nanchang UniversityNanchang 330031China

In this paper,we investigate the obnoxious facility location game with weighted ***,we design a randomized group strategy-proof mechanism with approximation ratio 3Wmax 2Wmin when the weighted agents are located on a line;then,on the cycle metric,we also discuss the strategy-proofness and the approximation ratios of a class of group strategy-proof deterministic mechanisms.

关键词： Obnoxious facility game Weighted agents Approximation mechanisms design without money Strategy-proof

Magnetic properties of sputtered anisotropic Pr–Fe–B thin films with different structures and antiferromagnetic materials

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Rare Metals 2016年第12期35卷 926-929页

作者： Fang Yang Wei Liu zhi-Dong zhang Shenyang National Laboratory for Materials Science Institute of Metal Research and International Centre for Materials PhysicsChinese Academy of Sciences Superconducting Materials Research Center Northwest Institute for Nonferrous Metal Research

Anisotropic Pr-Fe-B films with soft-magnetic layer （Fe） and/or antiferromagnetic layer （Mn, FeMn or MnO） were prepared by direct-current （DC） magnetron sputtering on Si （100） substrates heated at 650℃. The influence of four types＇ different structures on the magnetic properties of Pr-Fe-B films was investigated. The phase and magnetic properties were characterized by means of X-ray diffraction （XRD） and superconducting quantum interference device （SQUID）. Addition of anti-ferromagnetic layer enhances both the coercivity and the remanence ratios of Pr-Fe-B films with suitable structures. The interface number increases and the antiferromagnetic-ferromagnetic exchange interaction is likely to become stronger, which affect the improvement of magnetic properties. To further understand the influence of structures with soft-magnetic Fe layer and/or antifer- romagnetic FeMn layer on the magnetic properties of Pr-Fe-B hard-magnetic films, the thickness of Pr-Fe-B layer was designed to decrease from 600 to 50 nm. The improvement of magnetic properties becomes obvious in Mo（50 nm）/Pr-Fe-B（25 nm）Mo（2 nm）FeMn（20 nm）Mo （2 nm）Pr-Fe-B（25 nm）/Mo（50 rim） film.

关键词： Magnetic materials Thin films Coercivity Hysteresis loop Sputtering

Neonatal hemorrhage stroke and severe coagulopathy in a late preterm infant after receiving umbilical cord milking:A case report

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World Journal of Clinical Cases 2022年第16期10卷 5365-5372页

作者： Yan Lu zhi-Qun zhang Department of Neonatology Affiliated Hangzhou First People’s HospitalZhejiang University School of MedicineHangzhou 310003Zhejiang ProvinceChina

BACKGROUND Umbilical cord milking(UCM)is an alternative placental transfusion method for delayed umbilical cord clamping in routine obstetric practice,allowing prompt resuscitation of an ***,UCM has been adopted at some tertiary neonatal centers for preterm infants to enhance placental-to-fetal *** is not suggested for babies less than 28 wk of gestational age because it is associated with severe brain *** late preterm or term infants who do not require resuscitation,cord management is recommended to increase iron levels and prevent the development of iron deficiency anemia,which is associated with impaired motor development,behavioral problems,and cognitive *** remain about whether UCM increases the incidence of intraventricular ***,there are very few reports of late preterm infants presenting with neonatal hemorrhage stroke(NHS)and severe coagulopathy after receiving ***,we report a case of a late preterm infant born at 34 wk of *** abruptly deteriorated,exhibiting signs and symptoms of NHS and severe coagulopathy after receiving UCM on the first day of *** SUMMARY A female preterm infant born at 34 wk of gestation received UCM after *** was small for her gestational age and described as vigorous with Apgar scores of 9 and 10 at one minute and five minutes of life,*** hospitalization in the neonatal intensive care unit,she showed hypoglycemia and metabolic *** baby was administered glucose and sodium bicarbonate *** vitamin K1 was also used to prevent vitamin K *** baby developed umbilical cord bleeding and gastric bleeding on day 1 of life;a physical examination showed bilateral conjunctival hemorrhage,and a blood test showed thrombocytopenia,prolonged prothrombin time,prolonged activated partial thromboplastin time,low fibrinogen,raised D-dimer levels and anemia.A subsequent cranial ultrasound and computed tomography scan sho

关键词： Neonatal hemorrhage stroke Umbilical cord milking Coagulopathy Disseminated intravascular coagulation Premature infant Small for gestational age Case report

NATURAL SUPERCONVERGENT POINTS OF EQUILATERAL TRIANGULAR FINITE ELEMENTS - A NUMERICAL EXAMPLE

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Journal of Computational Mathematics 2006年第1期24卷 19-24页

作者： zhi-min zhang Ahmed Naga College of Mathematics and Computer Science Hunan Normal University Changsha 410081 China Department of Mathematics Wayne State University Detroit MI 48202 USA

A numerical test case demonstrates that the Lobatto and the Gauss points are not natural superconvergent points of the cubic and the quartic finite elements under equilateral triangular mesh for the Poisson equation.

关键词： Finite element method Superconvergence Triangular mesh Equilateral

Mutually inductive interactions between the lens and retina require ALK3 functions during mouse embryonic development

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International Journal of Ophthalmology(English edition) 2012年第2期5卷 119-124页

作者： Qi Zhao, zhi-Yu zhang Department of Ophthalmology Fourth Affiliated Hospital of China Medical University Shenyang 110032 Liaoning Province China Department of Ophthalmology Second Affiliated Hospital of Dalian Medical University Dalian 116023 Liaoning Province China

AIM: To investigate the mutually inductive interactions that occur between the lens and retinal tissue during the development of the vertebrate eye. METHODS: Cre-positive mice were mated with Cre-negative mice to generate 50% Cre-positive (conditional knockout, CKO) and 50% Cre-negative offspring (wild type, WT). The embryos were fixed in 4% paraformaldehyde, embedded in paraffin, and sectioned to a thickness of 4 mu m. The sections were processed for hematoxylin and eosin staining. The primary antibody used for immunofluorescence detection was sc-9305 bone morphogenetic proteins (bmp7) (Santa Cruz, US). The secondary antibody was IF-0314 aG0IgG/FITC (Santa Cruz) in combination with the primary antibody. Bright-field and fluorescent images were taken. RESULTS: Changes in the lens and retina were associated with specific alterations to the expression of type IA BMP receptor [BMPR-IA (ALK3)], which have already been implicated in eye growth. BMPR-IA was required for lens and retinal growth, but was not essential for the formation of lens. We observed that the expression of Bmp7 in the embryonic retina was reduced in the ALK3 lens of CKO mice. This phenomenon became increasingly visible in accordance with embryo development. This apparent alteration was present at stage E15.5. CONCLUSION: ALK3 is essential for lens and retinal growth. Mutually inductive interactions between the lens and retina are present in the developing mouse eye.

关键词： BMPR-IA Bmp7 inductive interactions lens retina

Flexible single-electrode triboelectric nanogenerator with MWCNT/PDMS composite film for environmental energy harvesting and human motion monitoring

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Rare Metals 2022年第9期41卷 3117-3128页

作者： Hao zhang Dong-zhi zhang Dong-Yue Wang Zhen-Yuan Xu Yan Yang Bao zhang College of Control Science and Engineering China University of Petroleum(East China)Qingdao266580China

With the rapid development of wearable electronic devices,modern portable energy sources pay more attention to lightweight,low cost,high flexibility and high *** paper proposed a flexible single-electrode triboelectric nanogenerator(S-TENG)composed of multi-walled carbon nanotube(MWCNT)/polydimethylsiloxane(PDMS)*** S-TENG has the advantages of high flexibility,high hydrophobicity,light weight,low cost,and high output *** peak-to-peak open circuit voltage can reach 435 V and the maximum short-circuit current density is 13μA·cm^(−2) under continuous *** the external load is 40 MΩ,the maximum output power density is 3.7 mW·cm^(−2).The S-TENG can not only harvest the mechanical energy generated by biological movement,but also can be used as a sensor to effectively detect human movement and handwriting *** addition,a 4×4 sensor array and a wireless transmission system were constructed to realize multi-point distributed detection and wireless transmission of portable smart *** S-TENG can harvest energy from falling water droplets,uninterrupted water flow,wind and percussion sounds,which demonstrates its broad application prospects in the field of flexible wearables.

关键词： Flexible Wearable Single-electrode Triboelectric nanogenerator(TENG) Environmental energy