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Surfactant Mediated Microphase Separation in Miscible Block Copolymer of Poly(4-vinyl pyridine-b-hydroxybutylacrylate)

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Chinese Journal of Polymer Science 2023年第6期41卷 897-904,I0007页

作者： Xiang-Yun Xu Yu-Tong Gao ying-ying Wang You-Shuang Zhou Bi-jin Xiong jin-Tao Zhu Key Laboratory of Materials Chemistry for Energy Conversion and Storage(HUST)of Ministry of Education School of Chemistry and Chemical Engineering.Huazhong University of Science and Technology(HUST)Wuhan 430074China Key Laboratory of Optoelectronic Chemical Materials and Devices(Ministry of Education) Jianghan UniversityWuhan 430056China Key Laboratory of Green Preparation and Application of Functional Materials(Ministry of Education) Hubei Key Laboratory of Polymer MaterialsFaculty of Materials Science and EngineeringHubei UniversityWuhan 430062China

Miscible disordered block copolymers(BCPs)are rarely studied due to the limits in self-assembly into ordered ***,we proposed a facile method for the transformation of disordered miscible BCPs to comb-like BCPs with well-ordered microphase separation structures via blending with amphiphilic *** this work,poly(4-vinyl pyridine-b-hydroxybutylacrylate)(P4VP-b-P4HBA)was applied as a model of miscible disordered BCPs and the microphase separation was induced via blending with surfactants of dodecylbenzene sulfonic acid(DBSA)and 3-pentadecylphenol(PDP).The ordered microstructures including spherical and cylindrical morphologies were confirmed by transmission electron microscopy(TEM)and small angle X-ray scattering(SAXS)*** ordered microstructures thermal sensitive,in which ordered and disordered transformation(ODT)was observed in the blend of P4VP-b-P4HBA and PDP whereas it disappeared in the blend of P4VP-b-P4HBA and *** results show that the thermal stability of the ordered microstructures are strongly depends on the interactions between the miscible BCPs and surfactants,which investigated by in situ SAXS and Fourier transform infrared spectrometer(FTIR).The combination of miscible BCPs and surfactant creates a feasible strategy to fabricate ordered nanostructures,which could be employed to develop complicated nanomaterials.

关键词： ordered disordered vinyl

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Gaseous and Electrochemical Hydrogen Storage Kinetics of As-quenched Nanocrystalline and Amorphous Mg_2Ni-type Alloys

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Journal of Wuhan University of Technology(Materials Science) 2013年第3期28卷 604-611页

作者：张羊换 YANG tai SHANG Hongwei ZHANG Guofang CAI ying ZHAO Dongliang Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and Technology Department of Functional Material Research Central Iron and Steel Research Institute

The nanocrystalline and amorphous Mg2Ni-type Mg2Ni1-xCox （x = 0, 0.1, 0.2, 0.3, 0.4） alloys were synthesized by melt quenching technology. The structures of the as-cast and quenched alloys were characterized by XRD, SEM and HRTEM. The gaseous hydrogen storage kinetics of the alloys was measured using an automatically controlled Sieverts apparatus. The alloy electrodes were charged and discharged with a constant current density in order to investigate the electrochemical hydrogen storage kinetics of the alloys. The results demonstrate that the substitution of Co for Ni results in the formation of secondary phases MgCo2 and Mg instead of altering the major phase Mg2Ni. No amorphous phase is detected in the as-quenched Co- ffee alloy, however, a certain amount of amorphous phase is clearly found in the as-quenched alloys substituted by Co. Furthermore, both the rapid quenching and the Co substitution significantly improve the gaseous and electrochemical hydrogen storage kinetics of the alloys, for which the notable increase of the hydrogen diffusion coefficient （D） along with the limiting current density （IL） and the obvious decline of the electrochemical impedance generated by both the Co substitution and the rapid quenching are basically responsible.

关键词： Mg2Ni-type alloy rapid quenching substituting Ni with Co hydrogen storage kinetics

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Wax deposition law and OLGA-Based prediction method for multiphase flow in submarine pipelines

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Petroleum 2022年第1期8卷 110-117页

作者： ying Xie jin Meng Diwen Chen School of petroleum engineering Southwest Petroleum UniversityChengdu610500China PipeChina Guangdong Pipe Network Co. LtdGuangdongChina

In this study,the effects of wax deposition on submarine multiphase pipelines are *** order to understand the mechanism of wax deposition in submarine multiphase pipelines,a wax deposition model in a submarine pipeline was established using the OLGA wax deposition module,and key factors influencing this phenomenon were ***,a multifactor impact analysis of wax deposition was performed via the orthogonal test *** results indicated the relative influence of five factors on oil-gas-water three-phase wax deposition,namely,oil flow rate,water content,inlet temperature,gas-oil ratio,and outlet ***,the main influencing factors of wax deposition in a multiphase pipeline flow were extracted,and the wax deposition prediction model was *** wax deposition rate under different operating conditions was simulated using the OLGA wax deposition simulation *** SPSS software was used to perform nonlinear regression analysis under different working *** this manner,the constant terms in the wax deposition prediction model for a submarine multiphase pipeline were *** prediction model could be used to programmatically predict wax deposition along a multiphase pipeline by programming the initial waxing *** using this method,the wax deposition prediction model of an MN submarine multiphase pipeline was obtained under different working *** comparing the predicted and the OLGA simulation results,it was concluded that the established wax deposition model can be used to accurately calculate the wax deposition in a submarine multiphase pipeline within an allowable error *** the physical properties and operating parameters of the conveying medium in a multiphase pipeline are given,the developed oil-gas-water three-phase wax deposition model can be used to predict the distribution of wax deposition in submarine multiphase pipelines without laboratory *** results of this stud

关键词： Submarine multiphase pipeline Wax deposition law OLGA Deposition model

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Control of floor heaves with steel pile in gob-side entry retaining

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International Journal of Mining Science and Technology 2016年第3期26卷 527-534页

作者： Xu ying Chen jin Bai Jianbiao School of Mines China University of Mining & Technology State Key Laboratory of Coal Resources and Mine Safety China University of Mining & Technology

A new approach named as steel pile method is innovatively proposed in this study to control severe floor heaves in gob-side entry retaining. It is required that the steel piles be installed in the floor corners with a certain interval before the influence of the dynamic pressure induced by current panel extraction. Using numerical simulation and theoretical analysis, this study investigated the interaction between the steel piles and the floor rocks during the service life of the steel piles, and revealed the mechanism of the steel piles in controlling floor heaves. The effect of the steel pile parameters on the control of floor heaves was presented and elaborated. It is found that the effectiveness of the steel piles in controlling floor heaves can be enhanced with greater installed dip angle, longer length and smaller interval of the steel *** with traditional methods, e.g., using floor anchor bolts and floor restoration, the advantages using steel pile were successfully defined in terms of controlling effect and economic benefits. It is hoped that the proposed method can contribute to the development of gob-side entry retaining technique.

关键词： Gob-side entry retaining Floor heave Steel pile Stress arch Control mechanism

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PREDICTION OF PODDED PROPELLER CAVITATION USING AN UNSTEADY SURFACE PANEL METHOD

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Journal of Hydrodynamics 2008年第6期20卷 790-796页

作者： YE jin-ming XIONG ying College of Naval Architecture and Power Naval University of Engineering Wuhan 430033 China

The unsteady sheet cavitation of podded propeller was predicted by using a surface panel method. The interaction between propeller and pod was treated with the iterative calculation of induced velocity potential, and the method of induced velocity potential can save a great deal of storage and computation time compared to the method of induced velocity. The induced velocity potential of unit singularity on every pod panel to every key blade panel and of unit singularity on every key blade panel and its wake panel to every pod panel were calculated when the key blade is at every angle position. Based on the wake model of the conventional single propeller, a new wake model of podded propeller was constructed. The propeller is analyzed only on the key blade in order to save computation time and memory space. The method can be used to calculate the hydrodynamics performance and cavitation of propeller in uniform and non-uniform inflows. It can give the unsteady force and cavitation shape of propeller. The propeller cavitation range determined by the present method agrees with the observation results of cavity image given in cavitation tunnel well, and this proves the practicability of the method.

关键词： pod propeller unsteady performance cavitation surface panel method

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Analysis of φ-divergence for Loglinear Models with Constraints under Product-multinomial Sampling

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Acta Mathematicae Applicatae Sinica 2013年第1期29卷 93-104页

作者： ying-hua jin Yao-hua Wu Department of Statistics and Finance University of Science and Technology of China Faculty of Applied Mathematics Guangdong University of Technology

The loglinear model under product-multinomial sampling with constraints is considered. The asymptotic expansion and normality of the restricted minimum C-divergence estimator （RMDE） which is a generalization of the maximum likelihood estimator is presented. Then various statistics based on C-divergence and RMCDE are used to test various hypothesis test problems under the model considered. These statistics contain the classical loglikelihood ratio test statistics and Pearson chi-squared test statistics. Ia the last section, a simulation study is implemented.

关键词： loglinear model product-multinomial sampling Restricted minimum C-divergence estimator(RMDE) C-divergence test statistics

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One-half layer pancreaticojejunostomy with the rear wall of the pancreas reinforced:A valuable anastomosis technique

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World Journal of Clinical Cases 2022年第26期10卷 9276-9284页

作者： jin-Ping Wei Sheng tai Zhi-Lei Su Department of General Surgery Beijing Chuiyangliu HospitalBeijing 100022China Department of Hepatopancreatobiliary Surgery The Second Affiliated Hospital of Harbin Medical UniversityHarbin 150086Heilongjiang ProvinceChina

BACKGROUND Postoperative pancreatic fistula(POPF)is one of the most common and serious complications after pancreaticoduodenectomy(PD).To effectively reduce the incidence of POPF,we designed a new type of pancreaticojejunostomy(PJ),which was termed one-half layer PJ with the rear wall of the pancreas *** To explore the clinical application value of this new *** We compared 62 patients who had undergone PD by either the traditional ductto-mucosa anastomoses or the new one-half layer PJ with the rear wall of the pancreas reinforced method at our hospital from May 2015 to September *** 62 patients were operated by the same surgeon experienced in both *** retrospectively analyzed patient characteristics,perioperative outcomes,and surgical *** There was no significant difference between the two groups in basic information except the postoperative hospital stays,14.7±5.4 d in the traditional duct-tomucosa anastomoses group and 12.0±4.2 d in the one-half layer PJ group(P=0.042).In terms of postoperative complications,the one-half layer PJ group had a lower rate of POPF than the traditional *** overall number of cases with POPF was 8(24.2%)in the traditional group and 2(6.9%)in the one-half layer group(P=0.017).Additionally,the rate of grades B and C POPF was lower in the one-half layer group(3.4%)compared with that(12.1%)in the traditional group(P=0.010).One patient died due to hemorrhage caused by severe pancreatic fistula in the traditional *** One-half layer PJ with the rear wall of the pancreas reinforced is a safe and feasible procedure that can successfully reduce the rate of *** may be a promising technique for PJ after PD.

关键词： Pancreaticoduodenectomy Pancreaticojejunostomy Pancreatic fistula One-half layer New technique Postoperative complications

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Vertical distribution of nonylphenol and nonylphenol ethoxylates in sedimentary core from the Beipaiming Channel, North China

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Journal of Environmental Sciences 2007年第3期19卷 353-357页

作者： jin Fen HU Jian-ying YANG Min State Key Lab of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China College of Environmental Science Peking University Beijing 100871 China

The vertical profiles of nonylphenol （NP） and nonylphenol ethoxylates （NPEOs） were investigated in a sediment core from the Beipaiming Channel, North China using high sensitive LC-MS and GC-MS metthods In this core, relatively high concentrations of NP and NPEOs occurred in the surface sediment （≤40 cm）, with the maximum value of NP and NPEOs reaching 3539 and 12735 mg/g, respectively, whereas, no NP or NPEOs were detected in deeper sediments （〉40 cm）. The high concentrations of NP and NPEOs in the surface layers suggested recent inputs in this area. NPEOs with short ethoxy chains （NPnEO, n=0-3） were dominant in the NPEO mixture with percentages from 54% to 78%, which were similar to the distribution of homolog NPEO in effluents from nearby sewage treatment plants （STPs）, indicating that the channel received the effluents from these STPs. The sewage treatment ratio was quite similar to that found in North America before the 1980s. Finally, the concentrations of NP and NPEOs were related to the total organic carbon （TOC）（p〈0.001）, suggesting that TOC was an important factor for vertical distribution of NPEOs and NP from the Beipaiming Channel.

关键词： nonylphenol nonylphenol ethoxylates sediment core Bohai Bay

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Carbon-based nanomaterials cause toxicity by oxidative stress to the liver and brain in Sprague-Dawley rats

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Nuclear Science and Techniques 2024年第6期35卷 54-64页

作者： ying-ying Xu Chan jin Meng Wu Jian-Ye Zhou Hui-Ling Wei Department of Gastroenterology China-Japan Friendship HospitalBeijing 100029China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Institute of Particle and Nuclear Physics College of PhysicsHenan Normal UniversityXinxiang 453007China

Carbon-based nanomaterials have important research significance in various disciplines,such as composite materials,nanoelectronic devices,biosensors,biological imaging,and drug ***,the human and ecological risks associated with carbon-based nanomaterials have received increasing ***,the biological safety of carbon based nanomaterials has not been systematically *** this study,we used different types of carbon materials,namely,graphene oxide(GO),single-walled carbon nanotubes(SWCNTs),and multiwalled carbon nanotubes(MWCNTs),as models to observe their distribution and oxidative damage in *** results of Histopathological and ultrastructural examinations indicated that the liver and lungs were the main accumulation targets of these ***-μ-XRF analysis revealed that SWCNTs and MWCNTs might be present in the *** shows that the three types of carbon-based nanomaterials could cross the gas-blood barrier and eventually reach the liver *** addition,SWCNTs and MWCNTs could cross the blood-brain barrier and accumulate in the cerebral *** increase in ROS and MDA levels and the decrease in GSH,SOD,and CAT levels indicated that the three types of nanomaterials might cause oxidative stress in the *** suggests that direct instillation of these carbon-based nanomaterials into rats could induce ROS *** addition,iron(Fe)contaminants in these nanomaterials were a definite source of free ***,these nanomaterials did not cause obvious damage to the rat brain *** deposition of selenoprotein in the rat brain was found to be related to oxidative stress and Fe *** information may support the development of secure and reasonable applications of the studied carbon-based nanomaterials.

关键词： Carbon-based nanomaterials Oxidative stress Trace element distribution TEM SR-μ-XRF

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Recent advancements in single-cell metabolic analysis for pharmacological research

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Journal of Pharmaceutical Analysis 2023年第10期13卷 1102-1116页

作者： ying Hou Hongren Yao jin-Ming Lin Beijing Key Laboratory of Microanalytical Methods and Instrumentation Key Laboratory of Bioorganic Phosphorus Chemistry&Chemical Biology(Ministry of Education)Department of ChemistryTsinghua UniversityBeijing100084China

Cellular heterogeneity is crucial for understanding tissue biology and disease *** research is being advanced by single-cell metabolic analysis,which offers a technique to identify variations in RNA,proteins,metabolites,and drug molecules in *** this review,the recent advancement of single-cell metabolic analysis techniques and their applications in drug metabolism and drug response are ***-precision and controlled single-cell isolation and manipulation are provided by microfluidics-based methods,such as droplet microfluidics,microchamber,open microfluidic probe,and digital *** are used in tandem with variety of detection techniques,including optical imaging,Raman spectroscopy,electrochemical detection,RNA sequencing,and mass spectrometry,to evaluate single-cell metabolic changes in response to drug *** advantages and disadvantages of different techniques are discussed along with the challenges and future directions for single-cell *** techniques are employed in pharmaceutical analysis for studying drug response and resistance pathway,therapeutic targets discovery,and in vitro disease model evaluation.

关键词： Single-cell Metabolism Pharmacology Drug response Microfluidics

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