资源类型

期刊论文 74

年份

2023 3

2022 6

2021 7

2020 4

2019 4

2017 8

2016 6

2015 5

2014 2

2013 2

2012 3

2011 4

2010 5

2009 2

2008 1

2007 4

2005 3

2003 3

2001 1

2000 1

展开 ︾

关键词

pH值 2

2050 1

Chrestenson谱 1

GM（1，1）模型 1

Gossip模型 1

H2S 1

HCG日 1

HMAC-SM3；侧信道分析；相关能量攻击；基于比特值的选择明文 1

IVF/ICSI 新鲜周期 1

P4 1

PH3 1

Pareto 优于关系 1

Pareto 强度值 1

Q值监测 1

SCE-UA算法 1

m值逻辑函数 1

三维构造 1

不确定性 1

不闭合等高线 1

展开 ︾

检索范围：

排序： 展示方式：

容易断裂的可降解塑料 Letter

杨栩旭, Jason Steck, 杨加伟, 王叶成, 锁志刚

《工程（英文）》 2021年 第7卷 第5期   页码 624-629 doi: 10.1016/j.eng.2021.02.009

摘要： 最终发现在加载的能量释放率范围内，裂纹扩展速率对载荷的变化不敏感，却对湿度和pH值具有较高的敏感性。这些发现将有助于可降解塑料的发展，并在医疗行业和环境可持续性发展方面具有重要意义。

关键词： 可降解塑料     水解反应     pH值     裂纹扩展    

HTML PDF 收藏

地下水碳酸平衡检查系统

刘建刚,郑克勋,傅伟宁,吴顺华

《中国工程科学》 2003年 第5卷 第9期   页码 61-64

摘要：

文章主要研究地下水在不同温度和CO2分压条件下碳酸三种存在形式与pH值的关系，以便更有效地对地下水水质资料进行可靠性检查。分析认为HCO3-出现峰值的分界pH0值，纯水在CO2分压1～105Pa，温度0～30℃时的变化范围为pH0值随温度的升高而降低。石灰岩和白云岩的pH0十分接近，碳酸盐岩地区的平衡特性将取决于方解石成分。

关键词： 碳酸盐岩     地下水     碳酸平衡     pH值    

HTML PDF 收藏

Carbon dots-based fluorescence sensor for two-photon imaging of pH in diabetic mice

《化学科学与工程前沿（英文）》 2023年 第17卷 第3期   页码 298-306 doi: 10.1007/s11705-022-2212-9

摘要： Herein, a reversible pH fluorescent sensor was developed using caffeic acid as the precursor by one-step solvothermal synthesis method. The carbon dots-based sensor (CA-CDs) exhibited pH-dependent increase in fluorescence intensity and showed linear relationship in the range of pH 6.60 and 8.00. Notably, the fluorescence sensor has a reversible response to pH change. Finally, the CA-CDs has been successfully applied for two-photon imaging of the pH in liver and kidney of diabetic mice. Imaging results showed that the pH value in kidney of diabetic mice was lower than that of the normal mice, while the pH value in liver of diabetic mice was almost the same as that of the normal mice. The present study provides a simple analytical method for pH detection suitable for in vivo.

关键词： carbon dots     two-photon imaging     pH     diabetic mice    

HTML PDF 收藏

量子点细胞自动机中四值逻辑门的设计与模拟新概念 Research Articles

Alireza NAVIDI1, Reza SABBAGHI-NADOOSHAN2, Massoud DOUSTI1

《信息与电子工程前沿（英文）》 2021年 第22卷 第11期   页码 1441-1550 doi: 10.1631/FITEE.2000590

摘要： 本文提出“四值QCA（QQCA）”新概念。该概念已在本团队专为四值QCA模型开发的量子点细胞自动模拟器（QCASim）中设定。设计了基本四值QCA逻辑门，如MIN、MAX和不同类型反相器（SQI，PQI，NQI和IQI），并通过QCASim验证。本文将例示QCASim如何通过其方便的CAD工具集快速而准确地工作。将QQCA主要的逻辑门与基于碳纳米管场效应晶体管（CNFET）的四值门进行比较，结果表明本文所设计的电路具有更小延迟和更低能耗。

关键词： 量子点细胞自动机（QCA）；四值逻辑；量子点细胞自动模拟器（QCASim）；四值QCA（QQCA）；四值译码器；四值门    

HTML PDF 收藏

Sorption of tetracycline to sediments and soils: assessing the roles of pH, the presence of cadmium and

Guixiang ZHANG, Xitao LIU, Ke SUN, Ye ZHAO, Chunye LIN

《环境科学与工程前沿（英文）》 2010年 第4卷 第4期   页码 421-429 doi: 10.1007/s11783-010-0265-3

摘要： Batch sorption experiments were conducted to evaluate the sorption behavior of tetracycline (TC, H L) on sediments and soils in the presence and absence of cadmium (Cd), as affected by pH and properties of sediments and soils. The results indicated stronger nonlinearity and higher capacity of TC sorption on sediments than on soils. Sorption of TC also strongly depended on environmental factors and sediment/soil properties. Lower pH facilitated TC sorption through a cation exchange mechanism, which also took place at pH values above 5.5, where TC existed as a zwitterion (H L ) or anions (HL and L ). When pH was above 7, however, ligand-promoted dissolution of TC might occur due to TC weakening the Al-O bond of aluminum oxide and the Fe-O bond of iron oxide. Natural organic matter (NOM) plays a more important role in TC sorption than cation exchange capacity (CEC) and clay contents. The presence of Cd (II) increased TC sorption on both sediments and soils, which resulted from the decrease of equilibrium solution pH caused by Cd exchange with H ions of sediment/soil surfaces. The increase of TC sorption was also related to the formation of TC-Cd complexes, where Cd acted as a bridge between the sediment/soil and TC.

关键词： sorption     tetracycline (TC)     pH     cadmium (Cd)     antibiotic    

HTML PDF 收藏

Effect of pH on biologic degradation of

Hongjing LI, Mengli HAO, Jingxian LIU, Chen CHEN, Zhengqiu FAN, Xiangrong WANG

《环境科学与工程前沿（英文）》 2012年 第6卷 第2期   页码 224-230 doi: 10.1007/s11783-011-0314-6

摘要： In this paper, the effect of pH on biological degradation of by alga-lysing bacteria in laboratory-scale sequencing batch biofilm reactors (SBBRs) was investigated. After 10 d filming with waste activated sludge, the biological film could be formed, and the bioreactors in which laid polyolefin resin filler were used to treat algal culture. By comparing the removal efficiency of chlorophyll at different aerobic time, the optimum time was determined as 5 h. Under pH 6.5, 7.5, and 8.5 conditions, the removal rates of were respectively 75.9%, 83.6%, and 78.3% (in term of chlorophyll ), and that of Chemical Oxygen Demand (COD ) were 30.6%, 35.8%, and 33.5%. While the removal efficiencies of ammonia nitrogen ( ) were all 100%. It was observed that the sequence of the removal efficiencies of algae, and organic matter were pH 7.5>pH 8.5>pH 6.5. The results showed that the dominant alga-lysing bacteria in the SBBRs was strain HM-01, which was identified as sp. by Polymerase Chain Reaction (PCR) amplification of the 16S rRNA gene, Basic Local Alignment Search Tool (BLAST) analysis, and comparison with sequences in the GenBank nucleotide database. The algicidal activated substance which HM-01 strain excreted could withstand high temperature and pressure, also had better hydrophily and stronger polarity.

关键词： pH     biological degradation     alga-lysing bacteria     sequencing batch biofilm reactor (SBBR)     16S rRNA     Bacillus sp    

HTML PDF 收藏

A Cu-modified active carbon fiber significantly promoted HS and PH simultaneous removal at a low reaction

《环境科学与工程前沿（英文）》 2021年 第15卷 第6期 doi: 10.1007/s11783-021-1425-3

摘要：

• Cu0.15-ACF performs the best for H2S and PH3 simultaneous removal.

关键词： ACF     H2S     PH3     Cu     Low temperature     Simultaneous removal    

HTML PDF 收藏

Decomposition of perfluorooctanoic acid by microwave-activated persulfate: Effects of temperature, pH

Yuchi LEE, Shanglien LO, Jeff KUO, Chinghong HSIEH

《环境科学与工程前沿（英文）》 2012年 第6卷 第1期   页码 17-25 doi: 10.1007/s11783-011-0371-x

摘要： Microwave-hydrothermal treatment of persistent and bioaccumulative perfluorooctanoic acid (PFOA) in water with persulfate ( ) has been found effective. However, applications of this process to effectively remediate PFOA pollution require a better understanding on free-radical scavenging reactions that also take place. The objectives of this study were to investigate the effects of pH (pH= 2.5, 6.6, 8.8, and 10.5), chloride concentrations (0.01–0.15 mol·L ), and temperature (60°C, 90°C, and 130°C) on persulfate oxidation of PFOA under microwave irradiation. Maximum PFOA degradation occurred at pH 2.5, while little or no degradation at pH 10.5. Lowering system pH resulted in an increase in PFOA degradation rate. Both high pH and chloride concentrations would result in more scavenging of sulfate free radicals and slow down PFOA degradation. When chloride concentrations were less than 0.04 mol·L at 90°C and 0.06 mol·L at 60°C, presence of chloride ions had insignificant impacts on PFOA degradation. However, beyond these concentration levels, PFOA degradation rates reduced significantly with an increase in chloride concentrations, especially under the higher temperature.

关键词： microwave     perfluorooctanoic acid     pH     persulfate     chloride ions     perfluorocarboxylic acids    

HTML PDF 收藏

Co-fermentation of waste activated sludge with food waste for short-chain fatty acids production: effect of pH

Leiyu FENG, Yuanyuan YAN, Yinguang CHEN

《环境科学与工程前沿（英文）》 2011年 第5卷 第4期   页码 623-632 doi: 10.1007/s11783-011-0334-2

摘要： Effect of pH ranging from 4.0 to 11.0 on co-fermentation of waste activated sludge (WAS) with food waste for short-chain fatty acids (SCFAs) production at ambient temperature was investigated in this study. Experimental results showed that the addition of food waste significantly improved the performance of WAS fermentation system, which resulted in the increases of SCFAs production and substrate reduction. The SCFAs production at pH 6.0, 7.0, 8.0, and 9.0 and fermentation time of 4 d was respectively 5022.7, 6540.5, 8236.6, and 7911.7 mg COD·L , whereas in the blank tests (no pH adjustment, pH 8.0 (blank test 1), no food waste addition, pH 8.0 (blank test 2), and no WAS addition (blank test 3)) it was only 1006.9, 971.1, and 1468.5 mg COD·L , respectively. The composition of SCFAs at pH from 6.0 to 9.0 was also different from other conditions and propionic acid was the most prevalent SCFA, which was followed by acetic and n-butyric acids, while acetic acid was the top product under other conditions. At pH 8.0 a higher volatile suspended solids (VSS) reduction of 16.6% for the mixture of WAS and food waste than the sole WAS indicated a synergistic effect existing in fermentation system with WAS and food waste. The influence of pH on the variations of nutrient content was also studied during anaerobic fermentation of the mixture of WAS and food waste at different pH conditions. The release of increased with fermentation time at all pH values investigated except 4.0, 5.0 and in blank test one. The concentrations of soluble phosphorus at acidic pHs and in the blank test one were higher than those obtained at alkaline pHs. Ammonia and phosphorus need to be removed before the SCFAs-enriched fermentation liquid from WAS and food waste was used as the carbon source.

关键词： waste activated sludge (WAS)     food waste     co-fermentation     short-chain fatty acids (SCFAs)     pH     synergistic effect    

HTML PDF 收藏

Tuning the electronic structure of NiCoP arrays through V doping for pH-universal hydrogen evolution

Yu Lin, Jinlei Wang, Duanlin Cao, Yaqiong Gong

《化学科学与工程前沿（英文）》 2021年 第15卷 第5期   页码 1134-1146 doi: 10.1007/s11705-020-2014-x

摘要： The exploration of cost-effective, high-performance, and stable electrocatalysts for the hydrogen evolution reaction (HER) over wide pH range (0–14) is of paramount importance for future renewable energy conversion technologies. Regulation of electronic structure through doping vanadium atoms is a feasible construction strategy to enhance catalytic activities, electron transfer capability, and stability of the HER electrode. Herein, V-doped NiCoP nanosheets on carbon fiber paper (CFP) (denoted as V -NiCoP/CFP) were constructed by doping V modulation on NiCoP nanosheets on CFP and used for pH-universal HER. Benefiting from the abundant catalytic sites and optimized hydrogen binding thermodynamics, the resultant V -NiCoP/CFP demonstrates a significantly improved HER catalytic activity, requiring overpotentials of 46.5, 52.4, and 85.3 mV to reach a current density of 10 mA·cm in 1 mol·L KOH, 0.5 mol·L H SO , and 1 mol·L phosphate buffer solution (PBS) electrolytes, respectively. This proposed cation-doping strategy provides a new inspiration to rationally enhance or design new-type nonprecious metal-based, highly efficient, and pH-universal electrocatalysts for various energy conversion systems.

关键词： hydrogen evolution reaction     transition metal phosphides     pH-universal     vanadium doping     carbon fiber paper    

HTML PDF 收藏

用于语音识别的二值神经网络 Regular Papers

Yan-min QIAN, Xu XIANG

《信息与电子工程前沿（英文）》 2019年 第20卷 第5期   页码 701-715 doi: 10.1631/FITEE.1800469

摘要： 为降低推理阶段计算量，本文开发了用于语音识别的二进制神经网络，并实现了高速的二值矩阵乘法。在中央处理器(CPU)和图形处理单元(GPU)上，二值矩阵乘法的运行速度是浮点矩阵乘法的5–7倍。针对大规模连续语音识别的声学建模，提出多种二值神经网络及相关模型优化算法。为提高二值模型的精度，探索了从浮点模型到二值模型的知识蒸馏技术。在标准的Switchboard语音识别任务上，该二值神经网络模型比浮点神经网络模型速度提高3–4倍。借助知识蒸馏技术，二值深度神经网络或卷积神经网络相对其浮点神经网络的词错误率增加可以保持在15%以内。若只二值化卷积神经网络的卷积层，词错误率增加几乎可忽略。

关键词： 语音识别；二值神经网络；二值矩阵乘法；知识蒸馏；位1计数    

HTML PDF 收藏

Acid resistance of methanogenic bacteria in a two-stage anaerobic process treating high concentration methanol wastewater

ZHOU Xuefei, REN Nanqi

《环境科学与工程前沿（英文）》 2007年 第1卷 第1期   页码 53-56 doi: 10.1007/s11783-007-0010-8

摘要： In this study, the two-stage upflow anaerobic sludge blanket (UASB) system and batch experiments were employed to evaluate the performance of anaerobic digestion for the treatment of high concentration methanol wastewater. The acid resistance of granular sludge and methanogenic bacteria and their metabolizing activity were investigated. The results show that the pH of the first UASB changed from 4.9 to 5.8 and 5.5 to 6.2 for the second reactor. Apparently, these were not the advisable pH levels that common methanogenic bacteria could accept. The methanogenic bacteria of the system, viz. Methanosarcina barkeri, had some acid resistance and could still degrade methanol at pH 5.0. If the methanogenic bacteria were trained further, their acid resistance would be improved somewhat. Granular sludge of the system could protect the methanogenic bacteria within its body against the impact of the acidic environment and make them degrade methanol at pH 4.5. The performance of granular sludge was attributed to its structure, bacteria species, and the distribution of bacterium inside the granule.

关键词： pH     Granular     upflow anaerobic     advisable pH     methanogenic    

HTML PDF 收藏

Aptamer-coded DNA nanoparticles for targeted doxorubicin delivery using pH-sensitive spacer

Pengwei Zhang, Junxiao Ye, Ergang Liu, Lu Sun, Jiacheng Zhang, Seung Jin Lee, Junbo Gong, Huining He, Victor C. Yang

《化学科学与工程前沿（英文）》 2017年 第11卷 第4期   页码 529-536 doi: 10.1007/s11705-017-1645-z

摘要： An anticancer drug delivery system consisting of DNA nanoparticles synthesized by rolling circle amplification (RCA) was developed for prostate cancer membrane antigen (PSMA) targeted cancer therapy. The template of RCA was a DNA oligodeoxynucleotide coded with PSMA-targeted aptamer, drug-loading domain, primer binding site and pH-sensitive spacer. Anticancer drug doxorubicin, as the model drug, was loaded into the drug-loading domain (multiple GC-pair sequences) of the DNA nanoparticles by intercalation. Due to the integrated pH-sensitive spacers in the nanoparticles, in an acidic environment, the cumulative release of doxorubicin was far more than the cumulative release of the drug in the normal physiological environment. In cell uptake experiments, treated with doxorubicin loaded DNA nanoparticles, PSMA-positive C4-2 cells could take up more doxorubicin than PSMA-null PC-3 cells. The prepared DNA nanoparticles showed the potential as drug delivery system for PSMA targeting prostate cancer therapy.

关键词： aptamer     DNA nanoparticles     rolling circle amplification     doxorubicin     drug delivery     pH sensitive    

HTML PDF 收藏

项目进度管理中基于挣值的随机工期分析 Review

Fernando Acebes, David Poza, José Manuel González-Varona, Adolfo López-Paredes

《工程（英文）》 2022年 第9卷 第2期   页码 148-162 doi: 10.1016/j.eng.2021.07.019

摘要：

挣值工期管理（EDM）是一种用于项目进度管理（PSM）的研究方法，当无法使用挣值管理（EVM）时，可以考虑这种方法。挣值工期管理用于估算进度偏差和最终项目工期。挣值工期管理和挣值管理的关键区别在于：在挣值工期管理中，用工作周期表示活动的值；而在挣值管理中，用成本表示活动的值。本文将展示如何使用挣值工期管理监控随机项目。为便于解释该方法，本文通过实例分析对呈现出高度不确定性的项目开展研究，项目中的各项活动采用随机工期。根据这些活动的网络拓扑分析该方法的可用性，并比较了挣值管理和挣值进度分析法（ESM）对项目进度管理的作用。

关键词： 挣值工期管理     挣值管理     随机项目控制     工期预测     不确定性    

HTML PDF 收藏

Efficient dechlorination of 2,4-dichlorophenol in an aqueous media with a mild pH using a Pd/TiO

Jiangkun DU,Jianguo BAO,Wei HU

《环境科学与工程前沿（英文）》 2015年 第9卷 第5期   页码 919-928 doi: 10.1007/s11783-015-0794-x

摘要： In this study, palladium-loaded titania nanotubes was fabricated on a titanium plate (Pd/TiO NTs/Ti) for efficient electrodechlorination of 2,4-chlorophenol with a mild pH condition. The nature of Pd/TiO NTs/Ti electrodes was characterized by field-emission scanning electron microscope (FESEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV) techniques. The characterization results indicated the generation of Pd nanoparticles which were evenly dispersed on titania nanotubes arrays on the Pd/TiO NTs/Ti surface. An effective degradation efficiency of up to 91% was achieved within 60 min at cathode potential of −0.7 V ( SCE) and initial pH of 5.5. The effects of the applied cathode potential and initial pH on the degradation efficiency were studied. A near neutral condition was more favorable since very low and very high pHs were not conducive to the dechlorination process. Furthermore, the intermediates analysis showed that the Pd/TiO NTs/Ti electrode could completely remove chlorine from 2, 4-dichlorophenol since only phenol was detected as the byproduct and the concentration of released chlorine ions indicated near-complete dechlorination. This work presents a good alternative technique for eliminating persistent chlorophenols in polluted wastewater without maintaining strong acidic environment.

关键词： Pd/TiO2NTs/Ti cathode     chlorophenols     electrocatalytic dechlorination     wastewater treatment    

HTML PDF 收藏

标题 作者 时间 类型 操作

容易断裂的可降解塑料

杨栩旭, Jason Steck, 杨加伟, 王叶成, 锁志刚

期刊论文

地下水碳酸平衡检查系统

刘建刚,郑克勋,傅伟宁,吴顺华

期刊论文

Carbon dots-based fluorescence sensor for two-photon imaging of pH in diabetic mice

期刊论文

量子点细胞自动机中四值逻辑门的设计与模拟新概念

Alireza NAVIDI1, Reza SABBAGHI-NADOOSHAN2, Massoud DOUSTI1

期刊论文

Sorption of tetracycline to sediments and soils: assessing the roles of pH, the presence of cadmium and

Guixiang ZHANG, Xitao LIU, Ke SUN, Ye ZHAO, Chunye LIN

期刊论文

Effect of pH on biologic degradation of

Hongjing LI, Mengli HAO, Jingxian LIU, Chen CHEN, Zhengqiu FAN, Xiangrong WANG

期刊论文

A Cu-modified active carbon fiber significantly promoted HS and PH simultaneous removal at a low reaction

期刊论文

Decomposition of perfluorooctanoic acid by microwave-activated persulfate: Effects of temperature, pH

Yuchi LEE, Shanglien LO, Jeff KUO, Chinghong HSIEH

期刊论文

Co-fermentation of waste activated sludge with food waste for short-chain fatty acids production: effect of pH

Leiyu FENG, Yuanyuan YAN, Yinguang CHEN

期刊论文

Tuning the electronic structure of NiCoP arrays through V doping for pH-universal hydrogen evolution

Yu Lin, Jinlei Wang, Duanlin Cao, Yaqiong Gong

期刊论文

用于语音识别的二值神经网络

Yan-min QIAN, Xu XIANG

期刊论文

Acid resistance of methanogenic bacteria in a two-stage anaerobic process treating high concentration methanol wastewater

ZHOU Xuefei, REN Nanqi

期刊论文

Aptamer-coded DNA nanoparticles for targeted doxorubicin delivery using pH-sensitive spacer

Pengwei Zhang, Junxiao Ye, Ergang Liu, Lu Sun, Jiacheng Zhang, Seung Jin Lee, Junbo Gong, Huining He, Victor C. Yang

期刊论文

项目进度管理中基于挣值的随机工期分析

Fernando Acebes, David Poza, José Manuel González-Varona, Adolfo López-Paredes

期刊论文

Efficient dechlorination of 2,4-dichlorophenol in an aqueous media with a mild pH using a Pd/TiO

Jiangkun DU,Jianguo BAO,Wei HU

期刊论文