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分析滤波器；线性预测；窄带语音水印；通带激励替代；能量规范化；谱包络成形；合成滤波器 1

能源消费；煤制天然气；非并网风电；经济性分析；CO2排放 1

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Influence of morphology on high-temperature rheological properties of bitumen modified with styrene-butadiene-styrene

《结构与土木工程前沿（英文）》 2021年 第15卷 第3期   页码 806-819 doi: 10.1007/s11709-021-0731-y

摘要： Different microstructures of the same polymer-modified bitumen (PMB) were obtained by subjecting the bitumen modified with styrene-butadiene-styrene (SBS) copolymer to isothermal annealing at various temperatures. The effects of the morphology on the rheological properties of SBS-modified bitumen were investigated within the high-temperature range. The PMB microstructures were quantitatively evaluated using image analysis. A dynamic shear rheometer was used to measure the rheological parameters of the PMB samples and perform the multiple stress creep and recovery (MSCR) test. A quantitative basis could be established on which to discuss the relationship between the PMB morphology and rheology. The image analysis indicated that conditioning by isothermal annealing evidently led to a difference in the microstructure of the samples. Variation of the thermal history is demonstrated to be a practical way to vary the morphology of the PMB with the same raw materials and formulation. Compared with the two-phase morphology, the single-phase microstructure tended to have a narrower linear viscoelastic (LVE) region of the PMB. Within the LVE region, especially at low frequencies, the homogenous PMB can store more energy when experiencing loadings and is more elastic. Outside the LVE region, based on the MSCR test results, the homogenous morphology could assist in reaching a higher percentage of strain recovery after the creep period.

关键词： polymer     bitumen     microstructure     rheology     viscoelasticity    

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Bio-based Waterborne Poly(Vanillin-Butyl Acrylate)/MXene Coatings for Leather with Desired Warmth Retention and Antibacterial Properties

Jianzhong Ma,Li Ma,Lei Zhang,Wenbo Zhang,Qianqian Fan,Buxing Han,

《工程（英文）》 doi: 10.1016/j.eng.2023.06.005

摘要： This study presents a solvent-free, facile synthesis of a bio-based green antibacterial agent and aromatic monomer methacrylated vanillin (MV) using vanillin. The resulting MV not only imparted antibacterial properties to coatings layered on leather, but could also be employed as a green alternative to petroleum-based carcinogen styrene (St). Herein, MV was copolymerized with butyl acrylate (BA) to obtain waterborne bio-based P(MV–BA) miniemulsion via miniemulsion polymerization. Subsequently, MXene nanosheets with excellent photothermal conversion performance and antibacterial properties, were introduced into the P(MV–BA) miniemulsion by ultrasonic dispersion. During the gradual solidification of P(MV–BA)/MXene nanocomposite miniemulsion on the leather surface, MXene gradually migrated to the surface of leather coatings due to the cavitation effect of ultrasonication and amphiphilicity of MXene, which prompted its full exposure to light and bacteria, exerting the maximum photothermal conversion efficiency and significant antibacterial efficacy. In particular, when the dosage of MXene nanosheets was 1.4 wt%, the surface temperature of P(MV–BA)/MXene nanocomposite miniemulsion-coated leather (PML) increased by about 15 °C in an outdoor environment during winter, and the antibacterial rate against Escherichia coli and Staphylococcus aureus was nearly 100% under the simulated sunlight treatment for 30 min. Moreover, the introduction of MXene nanosheets increased the air permeability, water vapor permeability, and thermal stability of these coatings. This study provides a new insight into the preparation of novel, green, and waterborne bio-based nanocomposite coatings for leather, with desired warmth retention and antibacterial properties. It can not only realize zero-carbon heating based on sunlight in winter, reducing the use of fossil fuels and greenhouse gas emissions, but also improve ability to fight off invasion by harmful bacteria, viruses, and other microorganisms.

关键词： MXene nanosheets     Vanillin     Styrene substitute     Leather coating     Photothermal conversion     Warmth retention     Antibacterial properties    

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Effect of styrene-butadiene-styrene copolymer on the aging resistance of asphalt: An atomistic understanding

《结构与土木工程前沿（英文）》 2021年 第15卷 第5期   页码 1261-1276 doi: 10.1007/s11709-021-0761-5

摘要： To reveal the potential influence of styrene-butadiene-styrene (SBS) polymer modification on the anti-aging performance of asphalt, and its mechanism, we explored the aging characteristics of base asphalt and SBS-modified asphalt by reaction force field (ReaxFF) and classical molecular dynamics simulations. The results illustrate that the SBS asphalt is more susceptible to oxidative aging than the base asphalt under oxygen-deficient conditions due to the presence of unsaturated C=C bonds in the SBS polymer. In the case of sufficient oxygen, the SBS polymer inhibits the oxidation of asphalt by restraining the diffusion of asphalt molecules. Compared with the base asphalt, the SBS asphalt exhibits a higher degree of oxidation at the early stage of pavement service and a lower degree of oxidation in the long run. In addition, SBS polymer degrades into small blocks during aging, thus counteracting the hardening of aged asphalt and partially restoring its low-temperature cracking resistance.

关键词： SBS asphalt     oxidative aging     asphalt hardening     ReaxFF     molecular dynamics    

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Synthesis of a new iron (III) porphyrin acrylate-styrene copolymer and its catalysis for hydroxylation

YU Hancheng, LI Xixian, HUANG Jinwang, JI Liangnian, CHEN Xianli

《化学科学与工程前沿（英文）》 2007年 第1卷 第1期   页码 65-67 doi: 10.1007/s11705-007-0013-9

摘要： A new iron (III) porphyrin acrylate-styrene copolymer, P[(PorFe)A-S], was synthesized by the reaction of iron (III) porphyrin acrylate with styrene and characterized by UV-Vis, Infrared spectra (IR), inductively coupled plasma-atomic emission spectrometry (ICP) and molecular weight determination. Its catalytic activity in the hydroxylation of cyclohexane for model cytochrome P450 in the P[(PorFe)A-S]-O ascrobate-thiosalicylic acid system has been studied. It was found that the P[(PorFe)A-S] has a higher catalytic activity than non-supported iron (III) porphyrin and its high catalytic activity remained in reuse. The catalytic activity of P[(PorFe)A-S] was discussed in the view of the microenvironment of iron (III) porphyrin. It is proposed that the atalytic activity of the P[(PorFe)A-S] may be further enhanced by construction of a homophase catalytic system containing the iron (III) porphyrin acrylate-styrene copolymer.

关键词： plasma-atomic emission     UV-Vis     weight determination     acrylate-styrene copolymer     styrene    

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Study on the gas permeabilities in styrene-butadiene rubber by molecular dynamics simulation

Hailu LIU, Xuejia DING, Jun YI, Liqun ZHANG, Sizhu WU,

《化学科学与工程前沿（英文）》 2010年 第4卷 第3期   页码 257-262 doi: 10.1007/s11705-009-0270-x

摘要： In this research, molecular dynamics (MD)simulations were used to study the transport properties of small gas molecules in the butadiene-styrene copolymer(SBR). The condensed-phase optimized molecular potentials for atomistic simulation studies (COMPASS) force field was applied. The diffusion coefficients were obtained from MD (NVT ensemble) and the relationship between gas permeability; the chemical structure and free volume of butadiene-styrene copolymer were investigated. The results indicated that the diffusion coefficient of oxygen declined with increasing styrene content. The fraction of free volume (FFV) in butadiene-styrene copolymer was calculated. It was concluded that diffusion coefficient increased as the FFV increases, which is in accordance with the analysis of the small molecular hop through the free volume in polymer matrix. Subsequently, the glass transition temperatures of these copolymers were calculated by MD. The result showed that the glass transition temperature increased with increasing styrene content in polymer.

关键词： diffusion     atomistic simulation     permeability     chemical structure     relationship    

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Utilization of MSWI fly ash as partial cement or sand substitute with focus on cementing efficiency and

Lei Zheng, Xingbao Gao, Wei Wang, Zifu Li, Lingling Zhang, Shikun Cheng

《环境科学与工程前沿（英文）》 2020年 第14卷 第1期 doi: 10.1007/s11783-019-1184-6

摘要： Washed MSWI fly ash was used as partial cement or sand substitute. Sand replacing is beneficial for strength, while cement replacement reduces strength. Cementing efficiency factor and mortar pore structure explain the strength results. Health risk assessment was conducted for MSWI fly ash blended cement mortar. CR and HI contributed by different exposures and heavy metals were analyzed. The strength of cement substituted mortar decreases with the increase in fly ash amount, whereas the strength increases when the fly ash is blended as sand substitute. A mortar with highest strength (compressive strength= 30.2 Mpa; flexural strength= 7.0 Mpa) was obtained when the sand replacement ratio was 0.75%. The k value (cementing efficiency) of fly ash varied between 0.36 and 0.15 for the fly ash fraction in binder between 5% and 25%. The k values of fly ash used for sand replacement were all significantly above that used for cement substitution. The macropores assigned to the gaps between particles decreased when the fly ash was used as sand replacement, providing an explanation for the strength enhancement. The waste-extraction procedure (toxicity-sulphuric acid and nitric acid method (HJ/T 299-2007)) was used to evaluate metal leaching, indicating the reuse possibility of fly ash blended mortar. For the mortar with the mass ratio of fly ash to binder of 0.5%, the carcinogenic risks (CR) and non-carcinogenic hazard quotient (HQ) in sensitive scenario for blended mortar utilization were 9.66 × 10-7 and 0.06, respectively; these results were both lower than the threshold values, showing an acceptable health risk. The CR (9.89 × 10-5) and HQ (3.89) of the non-sensitive scenario for fly ash treatment exceeded the acceptable threshold values, indicating health risks to onsite workers. The main contributor to the carcinogenic and non-carcinogenic risk is Cr and Cd, respectively. The CR and HQ from inhalation was the main route of heavy metal exposure.

关键词： MSWI fly ash     Cementing efficiency     Health risk assessment of heavy metal     Sand replacement     Cement replacement    

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Impacts of methanol fuel on vehicular emissions: A review

《环境科学与工程前沿（英文）》 2022年 第16卷 第9期 doi: 10.1007/s11783-022-1553-4

摘要：

● Methanol effectively reduces CO, HC, CO2, PM, and PN emissions of gasoline vehicles.

关键词： Methanol fuel     Vehicular emission     Emission reduction     Cleaner fuel     Gasoline substitute    

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Homoharringtonine is a safe and effective substitute for anthracyclines in children younger than 2 years

Xiaoxiao Chen, Yanjing Tang, Jing Chen, Ru Chen, Longjun Gu, Huiliang Xue, Ci Pan, Jingyan Tang, Shuhong Shen

《医学前沿（英文）》 2019年 第13卷 第3期   页码 378-387 doi: 10.1007/s11684-018-0658-4

摘要： Homoharringtonine (HHT), a plant alkaloid from , exhibits a unique anticancer mechanism and has been widely used in China to treat patients with acute myeloid leukemia (AML) since the 1970s. Trial SCMC-AML-2009 presented herein was a randomized clinical study designed based on our previous findings that pediatric AML patients younger than two years old may benefit from HHT-containing chemotherapy regimens. Patients randomized to arm A were treated with a standard chemotherapy regimen comprising mainly of anthracyclines and cytarabine (Ara-C), whereas patients in arm B were treated with HHT-containing regimens in which anthracyclines in all but the initial induction therapy were replaced by HHT. From February 2009 to November 2015, 59 patients less than 2 years old with AML (other than acute promyelocytic leukemia) were recruited. A total of 42 patients achieved a morphologic complete remission (CR) after the first course, with similar rates in both arms (70.6% vs.72.0%). At the end of the follow-up period, 40 patients remained in CR and 5 patients underwent hematopoietic stem cell transplantation in CR, which could not be considered as events but censors. The 5-year event-free survival (EFS) was 60.2%±9.6% for arm A and 88.0%±6.5% for arm B ( =0.024). Patients in arm B experienced shorter durations of leukopenia, neutropenia, and thrombocytopenia and had a lower risk of infection during consolidation chemotherapy with high-dosage Ara-C. Consequently, the homoharringtonine-based regimen achieved excellent EFS and alleviated hematologic toxicity for children aged younger than 2 years with AML compared with the anthracycline-based regimen.

关键词： homoharringtonine     acute myeloid leukemia     pediatrics    

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A method to synthesize CdSe nanocrystals

XIE Chuang, CHEN Wei, WANG Jingkang

《化学科学与工程前沿（英文）》 2007年 第1卷 第4期   页码 377-380 doi: 10.1007/s11705-007-0068-7

摘要： CdSe nanocrystals (NCs) have great application prospects in various fields due to their novel properties. Some high-cost and toxic materials such as --octylphosphine oxide (TOPO) are used in the popular method to synthesize CdSe NCs. Based on this, a new low-cost, environment-friendly and safe solvent was introduced in the synthesis of CdSe NCs in this paper. The prepared CdSe NCs were characterized by ultraviolet-visible spectra (UV-Vis), photoluminescence (PL), transmission electron micrograph (TEM), energy disperse X-ray spectra (EDX) and X-ray diffraction (XRD). The CdSe NCs obtained which show a good PL property are monodisperse, size-tunable and of high crystallinity. It indicates that the new solvent A is a good substitute for the solvent used in the classic route and achieves a greener synthesis of CdSe NCs.

关键词： octylphosphine     greener synthesis     substitute     electron micrograph     low-cost    

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biochar via a novel developed functionalization method to recover phosphate as a potential fertilizer substitute

《环境科学与工程前沿（英文）》 2021年 第15卷 第5期 doi: 10.1007/s11783-021-1387-5

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Purification and crystallization of xylitol from fermentation broth of corncob hydrolysates

Jinchao WEI, Qipeng YUAN, Tianxin WANG, Le WANG,

《化学科学与工程前沿（英文）》 2010年 第4卷 第1期   页码 57-64 doi: 10.1007/s11705-009-0295-1

摘要： Xylitol, a five-carbon sugar alcohol, is a valuable sugar substitute, and widely used in the pharmaceutical, odontological and food industry due to its interesting properties. In the past decades, the xylitol industry has grown rapidly and more attention has been focused on xylitol purification, which possesses an important proportion of the whole industry. In our paper, the purification and crystallization of xylitol fermentation broth by biotechnology using corncob hydrolysates as substance were studied. An initial xylitol fermentation broth was decolored with activated carbon (1% M-1, 60°C, 165rpm), desalted with a combination of two ion-exchange resins (732 and D301), and residual sugars were separated with UBK-555(Ca). Then the solution was vacuum-concentrated up to supersaturation (750g/L xylitol). After adding 1% xylitol crystal seeds, the supersaturated solution was cooled to −20°C for 48h. The crystalline xylitol of a regular tetrahedral shape with purity 95% and crystallization yield 60.2% was obtained from the clarified xylitol fermentation broth. An intact, economical and environmental-friendly route of purification and crystallization of xylitol from fermentation of corncob hydrolysates was obtained, and its experimental procedure and data provided a sound basis for large-scale industrial production.

关键词： ion-exchange     activated     supersaturation     tetrahedral     substitute    

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Synthesis of poly(maleic acid alkylamide-

Jingjing XU, Jun XU, Jie SUN, Shili XING, Li LI, Xuhong GUO

《化学科学与工程前沿（英文）》 2011年 第5卷 第1期   页码 74-78 doi: 10.1007/s11705-010-0542-5

摘要： To improve the flow ability of crude oil with high content of aromatic asphaltenes, new comb-type copolymers of poly(maleic anhydride- - -olefin- -styrene) (MASCs) with different ratios of maleic anhydride (MA) to styrene were designed and synthesized. H NMR and FTIR spectra were used to characterize the chemical structure of the copolymers. The effect of copolymers on the flow ability of model waxy oil and crude oil were studied by rheological method and polarizing light microscopy. Upon the addition of MASCs, the yield stresses of oils were decreased by 1 to 3 orders of magnitude, and the morphology of paraffin crystals were reduced and changed from plates to needles.

关键词： comb-polymers     styrene     paraffin     crystallization     flow ability    

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Cultivars and oil extraction techniques affect Cd/Pb contents and health risks in oil of rapeseed grown on Cd/Pb-contaminated farmland

《环境科学与工程前沿（英文）》 2023年 第17卷 第7期 doi: 10.1007/s11783-023-1687-z

摘要：

● Organic solvent extracted fewer Cd/Pb in rapeseed oil than physical pressing.

关键词： Rapeseed oil     Oil extraction technologies     Human health risk assessment     Cd/Pb-contaminated farmland     Substitute planting    

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一种基于子带激励替换的窄带语音水印算法 Article

Wei LIU, Ai-qun HU

《信息与电子工程前沿（英文）》 2017年 第18卷 第5期   页码 627-643 doi: 10.1631/FITEE.1601503

摘要： 本文建议了一种新的窄带语音水印算法，该算法将部分语音信号替换为一个经过幅度调节和频谱成形的隐蔽信号。文中从理论上证明了若仅对一小部分载体语音作修改，则不但可以建立一个用于隐蔽通信的理想信道模型，而且还能确保隐藏信号的不可感知性和带水印信号的可懂度。在此基础上，文中建议了一个实际的系统模型。在嵌入器中，使用了能量规范化准则，使得通带水印信号的能量与原始通带语音激励信号的能量相等，然后使用合成滤波器来对该水印信号进行频谱成形。在提取器中，先用带通滤波器去除带外信号，然后用分析滤波器对失真进行补偿。实验结果显示，本文建议算法的数据速率可达400 bits/s，具有更佳的带宽效率，且有良好的不可感知性。此外，该算法对实际应用中的各种攻击也是顽健的。

关键词： 分析滤波器；线性预测；窄带语音水印；通带激励替代；能量规范化；谱包络成形；合成滤波器    

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中国能源消费结构与风电/煤制天然气耦合经济性分析

余 波,曹 晨,顾为东

《中国工程科学》 2015年 第17卷 第3期   页码 100-106

摘要：

本文以年产1×109 m3煤制天然气工艺为例，采用Shell干粉气化技术，比较了传统煤制天然气工艺和风电/煤制天然气耦合情况下，工艺过程中（从煤气化到水煤气变换）的设备投资、运行费用以及CO2排放特性，结果表明，尽管风电电解水系统完全取代空分系统和水煤气变换系统设备投资巨大，但是其年平均运行费用（设备折旧、原料、电耗）却最低，CO2排放量为传统煤制天然气工艺的1.3 %，为煤制天然气产业发展提供一个参考。

关键词： 能源消费；煤制天然气；非并网风电；经济性分析；CO2排放    

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标题 作者 时间 类型 操作

Influence of morphology on high-temperature rheological properties of bitumen modified with styrene-butadiene-styrene

期刊论文

Bio-based Waterborne Poly(Vanillin-Butyl Acrylate)/MXene Coatings for Leather with Desired Warmth Retention and Antibacterial Properties

Jianzhong Ma,Li Ma,Lei Zhang,Wenbo Zhang,Qianqian Fan,Buxing Han,

期刊论文

Effect of styrene-butadiene-styrene copolymer on the aging resistance of asphalt: An atomistic understanding

期刊论文

Synthesis of a new iron (III) porphyrin acrylate-styrene copolymer and its catalysis for hydroxylation

YU Hancheng, LI Xixian, HUANG Jinwang, JI Liangnian, CHEN Xianli

期刊论文

Study on the gas permeabilities in styrene-butadiene rubber by molecular dynamics simulation

Hailu LIU, Xuejia DING, Jun YI, Liqun ZHANG, Sizhu WU,

期刊论文

Utilization of MSWI fly ash as partial cement or sand substitute with focus on cementing efficiency and

Lei Zheng, Xingbao Gao, Wei Wang, Zifu Li, Lingling Zhang, Shikun Cheng

期刊论文

Impacts of methanol fuel on vehicular emissions: A review

期刊论文

Homoharringtonine is a safe and effective substitute for anthracyclines in children younger than 2 years

Xiaoxiao Chen, Yanjing Tang, Jing Chen, Ru Chen, Longjun Gu, Huiliang Xue, Ci Pan, Jingyan Tang, Shuhong Shen

期刊论文

A method to synthesize CdSe nanocrystals

XIE Chuang, CHEN Wei, WANG Jingkang

期刊论文

biochar via a novel developed functionalization method to recover phosphate as a potential fertilizer substitute

期刊论文

Purification and crystallization of xylitol from fermentation broth of corncob hydrolysates

Jinchao WEI, Qipeng YUAN, Tianxin WANG, Le WANG,

期刊论文

Synthesis of poly(maleic acid alkylamide-

Jingjing XU, Jun XU, Jie SUN, Shili XING, Li LI, Xuhong GUO

期刊论文

Cultivars and oil extraction techniques affect Cd/Pb contents and health risks in oil of rapeseed grown on Cd/Pb-contaminated farmland

期刊论文

一种基于子带激励替换的窄带语音水印算法

Wei LIU, Ai-qun HU

期刊论文

中国能源消费结构与风电/煤制天然气耦合经济性分析

余 波,曹 晨,顾为东

期刊论文