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Modified Black Widow Optimization-Based Enhanced Threshold Energy Detection Technique for Spectrum Sensing in Cognitive Radio Networks
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作者 R.Saravanan R.Muthaiah A.Rajesh 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第3期2339-2356,共18页
This study develops an Enhanced Threshold Based Energy Detection approach(ETBED)for spectrum sensing in a cognitive radio network.The threshold identification method is implemented in the received signal at the second... This study develops an Enhanced Threshold Based Energy Detection approach(ETBED)for spectrum sensing in a cognitive radio network.The threshold identification method is implemented in the received signal at the secondary user based on the square law.The proposed method is implemented with the signal transmission of multiple outputs-orthogonal frequency division multiplexing.Additionally,the proposed method is considered the dynamic detection threshold adjustments and energy identification spectrum sensing technique in cognitive radio systems.In the dynamic threshold,the signal ratio-based threshold is fixed.The threshold is computed by considering the Modified Black Widow Optimization Algorithm(MBWO).So,the proposed methodology is a combination of dynamic threshold detection and MBWO.The general threshold-based detection technique has different limitations such as the inability optimal signal threshold for determining the presence of the primary user signal.These limitations undermine the sensing accuracy of the energy identification technique.Hence,the ETBED technique is developed to enhance the energy efficiency of cognitive radio networks.The projected approach is executed and analyzed with performance and comparison analysis.The proposed method is contrasted with the conventional techniques of theWhale Optimization Algorithm(WOA)and GreyWolf Optimization(GWO).It indicated superior results,achieving a high average throughput of 2.2 Mbps and an energy efficiency of 3.8,outperforming conventional techniques. 展开更多
关键词 Cognitive radio network spectrum sensing noise uncertainty modified black widow optimization algorithm energy detection technique
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A novel nanofluid of modified carbon black nanoparticles for enhanced oil recovery in low permeability reservoirs
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作者 Guang Zhao Li-Hao Liang +3 位作者 Dong-Fang Lv Wen-Juan Ji Qing You Cai-Li Dai 《Petroleum Science》 SCIE EI CAS CSCD 2023年第3期1598-1607,共10页
A novel nanofluid of modified carbon black(MCB)nanoparticles was initially developed for enhanced oil recovery(EOR)in low permeability reservoirs.The MCB nanoparticles were obtained via a three-step reaction involving... A novel nanofluid of modified carbon black(MCB)nanoparticles was initially developed for enhanced oil recovery(EOR)in low permeability reservoirs.The MCB nanoparticles were obtained via a three-step reaction involving modification by oxidation,acyl chlorination,and activated grafting.MCB nano-particles were spherically dispersed,with an average size of 72.3 nm.Compared with carbon black(CB)nanoparticles,dispersed MCB nanoparticles can effectively reduce the oil-water interfacial tension(IFT)to 10^(-2)mN/m and change the surface wettability of sand particles.Based on the results of core flooding experiments,the MCB nanoparticles exhibited a better EOR capacity than surfactants and CB nano-particles,and the final oil recovery was significantly increased by 27.27%.The core scanning test showed that the MCB nanoparticles could plug high permeability channels by adsorbing onto the surfaces of sand particles and forming larger aggregates that bridge across pores or throats,resulting in a higher swept volume.The synergistic effects of improved swept volume and oil displacement efficiency were the EOR mechanisms of the MCB nanoparticles.The studies indicate that these MCB nanoparticles have excellent potential for EOR in low permeability reservoirs. 展开更多
关键词 modified carbon black nanoparticles Interfacial tension reduction Displacement efficiency Synergistic effects Enhanced oil recovery
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One-step Fabrication of Nanoporous Black Silicon Surfaces for Solar Cells using Modified Etching Solution 被引量:2
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作者 汤叶华 周春兰 +4 位作者 周肃 赵彦 王文静 费建明 曹红彬 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2013年第1期102-108,I0004,共8页
Currently, a conventional two-step method has been used to generate black silicon (BS) surfaces on silicon substrates for solar cell manufacturing. However, the performances of the solar cell made with such surface ... Currently, a conventional two-step method has been used to generate black silicon (BS) surfaces on silicon substrates for solar cell manufacturing. However, the performances of the solar cell made with such surface generation method are poor, because of the high surface recombination caused by deep etching in the conventional surface generation method for BS. In this work, a modified wet chemical etching solution with additives was developed. A homogeneous BS layer with random porous structure was obtained from the modified solution in only one step at room temperature. The BS layer had low reflectivity and shallow etching depth. The additive in the etch solution performs the function of pH-modulation. After 16-min etching, the etching depth in the samples was approximately 200 nm, and the spectrum-weighted-reflectivity in the range from 300 nm to 1200 nm was below 5%. BS solar cells were fabricated in the production line. The decreased etching depth can improve the electrical performance of solar cells because of the decrease in surface recombination. An efficiency of 15.63% for the modified etching BS solar cells was achieved on a large area, p- type single crystalline silicon substrate with a 624.32-mV open circuit voltage and a 77.88% fill factor. 展开更多
关键词 modified etching solution black silicon surface Shallower etching depth blacksilicon solar cell
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Modified de Broglie-Bohm approach to the Schwarzschild black hole
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作者 王波波 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第8期2817-2823,共7页
A modified de Broglie-Bohm approach is generalized to the Schwarzschild black hole. By using this method, the quantum potential and the quantum trajectories of the black hole are investigated. And we find that the lin... A modified de Broglie-Bohm approach is generalized to the Schwarzschild black hole. By using this method, the quantum potential and the quantum trajectories of the black hole are investigated. And we find that the linear combination of two particular solutions of the black hole wavefunction is not physical although each of them is physical, if we think that the quantum gravity should reduce into its corresponding classical counterpart in which the gravity vanishes. It seems to confirm the argument, given by Alwis and MacIntire, that a possible resolution on the quantum gravity is to give up the superposition principle. 展开更多
关键词 modified de Broglie-Bohm interpretation black hole quantum trajectory quantum potential
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P-V Criticality of a Modified BTZ Black Hole in 2 + 1 Dimensional Intrinsic Time Quantum Gravity
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作者 A. S. Kubeka 《Journal of Modern Physics》 2019年第3期294-301,共8页
Intrinsic time quantum geometrodynamics is a formulation of quantum gravity naturally adapted to 3 + 1 dimensions. In this paper we construct its analogous 2 + 1 formulation, taking note of the mathematical structures... Intrinsic time quantum geometrodynamics is a formulation of quantum gravity naturally adapted to 3 + 1 dimensions. In this paper we construct its analogous 2 + 1 formulation, taking note of the mathematical structures which are preserved. We apply the resulting construction to convert the BTZ black hole metric to ITQG framework. We then modify the BTZ black hole in order to investigate the existence of the P-V criticality in ITQG theory. 展开更多
关键词 INTRINSIC Time QUANTUM Geometrodynamics modified BTZ black HOLE 2 + 1 QUANTUM Gravity black HOLE P-V CRITICALITY Van der Waals Fluid Liquid-Gas Phase Transition
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INFLUENCES OF MODIFIERS ON SURFACE PROPERTIES OF WHITE CARBON BLACK AND MECHANICAL PROPERTIES OF SILICONE RUBBER 被引量:5
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作者 D.M. Zheng, J. Yan and B.Q. Jiang Chemical Engineering Department of Nanchang University, Nanchang 330029, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1999年第5期1090-1093,共4页
Various of modifiers were used to modify the surface activity of white carbon black. The oil absorption, viscosity, hydrophobic rate and burning loss of white carbon black and the mechanical propertiess of silicone ru... Various of modifiers were used to modify the surface activity of white carbon black. The oil absorption, viscosity, hydrophobic rate and burning loss of white carbon black and the mechanical propertiess of silicone rubber were measured. The influences of the modifiers on the properties of white carbon black and the mechanical properties of silicone rubber were discussed. 展开更多
关键词 white carbon black modifiER silicone rubber
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Modified Newtonian Dynamics as an Entropic Force
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作者 Diego A. Carranza Sergio Mendoza 《Journal of Modern Physics》 2015年第6期786-793,共8页
Under natural assumptions on the thermodynamic properties of space and time with the holo-graphic principle, we reproduce a MOND-like behaviour of gravity on particular scales of mass and length, where Newtonian gravi... Under natural assumptions on the thermodynamic properties of space and time with the holo-graphic principle, we reproduce a MOND-like behaviour of gravity on particular scales of mass and length, where Newtonian gravity requires a modification or extension if no dark matter component is introduced in the description of gravitational phenomena. The result is directly obtained with the assumption that a fundamental constant of nature with dimensions of acceleration needs to be introduced into gravitational interactions. This in turn allows for modifications or extensions of the equipartion law and/or the holographic principle. In other words, MOND-like phenomenology can be reproduced when appropriate generalised concepts at the thermodynamical level of space and/or at the holographic principle are introduced. Thermodynamical modifications are reflected in extensions to the equipartition law which occur when the temperature of the system drops below a critical value, equals to Unruh’s temperature evaluated at the acceleration constant scale introduced for the description of the gravitational phenomena. Our calculations extend the ones by [1] in which Newtonian gravity is shown to be an emergent phenomenon, and together with it reinforces the idea that gravity at all scales is emergent. 展开更多
关键词 Alternative Theories of GRAVITY modified NEWTONIAN Dynamics CLASSICAL black HOLES Entropy THERMODYNAMICS of black HOLES
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玉屏风加减煎剂对德化黑鸡柔嫩艾美耳球虫的抗感染效果
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作者 林雪玲 林祚贵 +3 位作者 赖宝色 徐磊 刘志军 马玉芳 《福建农业学报》 CAS CSCD 北大核心 2024年第6期633-642,共10页
【目的】探明玉屏风加减煎剂对柔嫩艾美耳球虫(Eimeria tenella)感染德化黑鸡抗氧化、抗炎、免疫功能的影响及抗球虫效果。【方法】将120只45日龄德化黑鸡随机分为6组,分别是空白对照组(K组)、感染对照组(G组)、常山青蒿低剂量组(CQL组... 【目的】探明玉屏风加减煎剂对柔嫩艾美耳球虫(Eimeria tenella)感染德化黑鸡抗氧化、抗炎、免疫功能的影响及抗球虫效果。【方法】将120只45日龄德化黑鸡随机分为6组,分别是空白对照组(K组)、感染对照组(G组)、常山青蒿低剂量组(CQL组)、玉屏风加减低剂量组(YL组)、常山青蒿高剂量组(CQH组)、玉屏风加减高剂量组(YH组),除空白对照组外,其余各组均感染柔嫩艾美耳球虫,24 h后开始连续7 d饮水给药,第8 d测定比较各组抗球虫指数、免疫功能、抗氧化能力等指标的差异。【结果】与感染对照组(G组)相比,中药处理组CQH、YH、CQL、YL的血便、盲肠病变症状依次减轻。除CQH组外,其他组盲肠病变计分、盲肠黏膜下淋巴细胞密度显著或极显著下降(P<0.05或P<0.01);除CQH组OPG显著下降(P<0.05)外,其他3个中药组OPG下降极显著(P<0.01);YL组和YH组盲肠上皮细胞脱落计分极显著降低(P<0.01)。与CQL、CQH组相比,YL、YH组MDA、盲肠病变计分、盲肠上皮细胞脱落计分和OPG下降极显著(P<0.01)。与G组相比,4个中药组IL-6、 IFN-γ、TNF-α、丙二醛(MDA)含量极显著降低(P<0.01),而IL-2含量、 SIgA水平、谷胱甘肽过氧化物酶(GSH-Px)活性、超氧化物歧化酶(SOD)活性、过氧化氢酶(CAT)活性、总抗氧化能力(T-AOC)极显著升高(P<0.01);YL组IL-2含量、 SIgA水平、GSH-Px活性、SOD活性、CAT活性极显著增高(P<0.01),YH组GSH-Px、 SOD活性极显著升高(P<0.01)。与K组相比,G组、CQL组、YL组、CQH组、YH组的相对增重率分别是79.88%、 103.49%、 107.27%、 95.05%、 96.06%,抗球虫指数(anti-coccidialindex,ACI)分别是96、165.5、177、133.5、162.5。【结论】玉屏风加减煎剂对人工感染柔嫩艾美耳球虫德化黑鸡具有更好抗炎、抗氧化、提高免疫功能的免疫调节作用,并相应具有更好的抗球虫效果,且以玉屏风加减低剂量组(YL)抗球虫效果最好。 展开更多
关键词 玉屏风加减煎剂 德化黑鸡 柔嫩艾美耳球虫 免疫调节 抗球虫指数
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臭氧改性炭黑/天然橡胶湿法混炼复合材料的性能研究
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作者 韩霜 邱健 +4 位作者 单体仑 郝英杰 隋雁俊 单体坤 汪传生 《橡胶工业》 CAS 2024年第5期338-343,共6页
通过臭氧改性炭黑的亲水性,研究臭氧改性炭黑/天然橡胶湿法混炼复合材料的性能。结果表明:与炭黑相比,臭氧改性炭黑的表面含氧官能团增加,亲水性增强,更适用于天然橡胶复合材料的湿法混炼工艺;当臭氧改性炭黑浆液的质量分数为0.08时,复... 通过臭氧改性炭黑的亲水性,研究臭氧改性炭黑/天然橡胶湿法混炼复合材料的性能。结果表明:与炭黑相比,臭氧改性炭黑的表面含氧官能团增加,亲水性增强,更适用于天然橡胶复合材料的湿法混炼工艺;当臭氧改性炭黑浆液的质量分数为0.08时,复合材料的耐磨性能大幅提升,滚动阻力降低,综合性能较优。 展开更多
关键词 天然橡胶 臭氧改性炭黑 湿法混炼 亲水性 耐磨性能 滚动阻力
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修正的Black-Scholes模型下的欧式期权定价 被引量:9
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作者 孙玉东 师义民 《高校应用数学学报(A辑)》 CSCD 北大核心 2012年第1期23-32,共10页
通常情况下,期权定价研究都假定股票价格的波动率和期望收益率为常数.假定波动率和期望收益率为股票价格的一般函数.利用金融市场复制策略及布朗运动的Ito公式,得到欧式未定权益的一般Black-Scholes偏微分方程,并通过求解偏微分方程获... 通常情况下,期权定价研究都假定股票价格的波动率和期望收益率为常数.假定波动率和期望收益率为股票价格的一般函数.利用金融市场复制策略及布朗运动的Ito公式,得到欧式未定权益的一般Black-Scholes偏微分方程,并通过求解偏微分方程获得欧式期权定价公式. 展开更多
关键词 布朗运动 期权定价 修正的black-Scholes模型
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热解炭黑与沥青相容性的分子动力学模拟
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作者 邓覃浩 李闯民 +2 位作者 艾毅 甘有为 伍漳麟 《建筑材料学报》 EI CAS CSCD 北大核心 2024年第9期796-805,815,共11页
为了探索废轮胎热解炭黑(PCB)与沥青的相容特性,选取PCB外层灰分的主要组分SiO_(2)和ZnO作为其代表,以含缺陷的石墨烯层(D-Graphene)作为炭黑表层,使用Materials Studio软件构建沥青与这些组分的界面模型.通过分子动力学研究发现:ZnO与... 为了探索废轮胎热解炭黑(PCB)与沥青的相容特性,选取PCB外层灰分的主要组分SiO_(2)和ZnO作为其代表,以含缺陷的石墨烯层(D-Graphene)作为炭黑表层,使用Materials Studio软件构建沥青与这些组分的界面模型.通过分子动力学研究发现:ZnO与沥青的黏附能密度最高,其次为D-Graphene,SiO_(2)最低;D-Graphene/沥青界面的沥青分子活性极高,显示出最大的均方位移和扩散系数;ZnO对沥青各组分均表现出较强的吸附性,而SiO_(2)与D-Graphene对沥青不同组分的吸附表现出选择性.基于模拟结果可推测,提高PCB与沥青黏附性的关键在于尽可能消除PCB中的酸性矿物灰分,并暴露其表层活性点. 展开更多
关键词 改性沥青 热解炭黑 分子动力学 界面模型 相容性
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改性煤矸石对砂姜黑土物理结构及有机碳组分的影响
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作者 殷奥杰 张世文 +2 位作者 周思雨 胡睿鑫 陈方可 《农业环境科学学报》 CAS CSCD 北大核心 2024年第8期1805-1814,共10页
为了探究改性煤矸石对砂姜黑土胀缩性、有机碳及其组分的影响,将煤矸石破碎为3种水平(0~2、2~5、5~8 mm),并将其分别在3%氢氧化钠溶液(75℃)和5%盐酸溶液(70℃)中浸泡保温2 h获得碱改性煤矸石和酸改性煤矸石,对煤矸石改性前后结构进行... 为了探究改性煤矸石对砂姜黑土胀缩性、有机碳及其组分的影响,将煤矸石破碎为3种水平(0~2、2~5、5~8 mm),并将其分别在3%氢氧化钠溶液(75℃)和5%盐酸溶液(70℃)中浸泡保温2 h获得碱改性煤矸石和酸改性煤矸石,对煤矸石改性前后结构进行表征。以砂姜黑土为研究对象,通过室内培养试验分析改性煤矸石对土壤容重(ρb)、总孔隙度(φ)、微观孔隙参数、收缩特征及有机碳组分变化的影响。结果表明:碱改性、酸改性煤矸石添加后ρb较对照(不添加煤矸石处理)显著降低25.60%~38.69%、26.19%~35.71%,较煤矸石处理降低1.57%~5.50%、0.85%~2.36%;φ较对照分别提高44.34%~67.02%、45.38%~61.88%,较煤矸石处理分别提高1.34%~3.84%、0.65%~2.19%;土壤微观孔隙体积均有一定程度下降,微观孔隙平均直径增大;土壤线性伸展系数整体趋势为对照>5~8 mm煤矸石>2~5 mm煤矸石>5~8 mm酸改性煤矸石>5~8 mm碱改性煤矸石>0~2 mm煤矸石≈2~5 mm酸改性煤矸石>2~5 mm碱改性煤矸石>0~2 mm酸改性煤矸石>0~2 mm碱改性煤矸石,收缩率整体变化趋势与土壤线性伸展系数一致。土壤有机碳、溶解性有机碳、易氧化有机碳、微生物生物量碳含量较对照分别增加了103.19%~328.88%、98.23%~470.50%、100.00%~279.90%、85.88%~347.53%。随煤矸石粒径增大,ρb与碳组分含量整体呈下降趋势,土壤线性伸展系数与收缩率呈上升趋势。结构方程表明,土壤胀缩性是影响土壤有机碳组分含量累积的关键因素。综上,酸、碱改性煤矸石添加均能降低土壤ρb、改善土壤孔隙结构及胀缩性,增加有机碳及其组分含量。碱改性改良效果总体优于酸改性,小粒径优于大粒径,因此得出淮北地区比较科学合理的砂姜黑土改良措施是添加0~2 mm碱改性煤矸石。 展开更多
关键词 改性煤矸石 砂姜黑土 物理结构 有机碳组分
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NaCl改性沸石充释氧性能及对黑臭水体中氨氮去除效能研究
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作者 毛雪 崔建国 《应用化工》 CAS CSCD 北大核心 2024年第2期277-281,共5页
基于天然沸石的多孔性能和对氨氮具有良好的选择吸附特性,利用NaCl对其进行改性,研究其载氧、锁氧和缓释氧能力,并以模拟黑臭水体为对象,研究初始氨氮浓度、温度、pH等条件对改性沸石吸附氨氮能力的影响。结果表明,1.0 mol/L NaCl改性... 基于天然沸石的多孔性能和对氨氮具有良好的选择吸附特性,利用NaCl对其进行改性,研究其载氧、锁氧和缓释氧能力,并以模拟黑臭水体为对象,研究初始氨氮浓度、温度、pH等条件对改性沸石吸附氨氮能力的影响。结果表明,1.0 mol/L NaCl改性天然沸石可将模拟黑臭废水中溶解氧浓度从0.2 mg/L提高到7.2 mg/L,并保持数周,说明改性沸石具有锁氧功能,并且氧的缓释效果明显,有利于持续较长时间的水处理过程;在改性沸石材料投加量为10 g/L,pH为7,温度为25℃,初始浓度为30 mg/L的条件下对氨氮的去除率可达91.0%,表明改性沸石对改善高氨氮水质具有显著而高效的作用。 展开更多
关键词 NaCl改性沸石 缓释氧 氨氮去除 黑臭水体
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Effect of nano-carbon black content on wetting phenomenon of molten steel and alumina-carbon ceramic filter substrates
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作者 Jin-wen Song Wen Yan +2 位作者 Zhe Chen Ying Liu Shao-song Hong 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2024年第8期1900-1913,共14页
The effect of nano-carbon black content(O,8 and 12 wt.%)on the wettability of molten steel on Al_(2)O_(3)-C substrates was investigated by the sessile drop wetting method at 1500℃ under argon atmosphere.At the beginn... The effect of nano-carbon black content(O,8 and 12 wt.%)on the wettability of molten steel on Al_(2)O_(3)-C substrates was investigated by the sessile drop wetting method at 1500℃ under argon atmosphere.At the beginning of the wetting experiment,the contact angle decreased with the increase in nano-carbon black content.As the wetting experiment progressed,FeAl_(2)0_(4) layer and sheet Al_(2)O_(3) layer were found at the interface between the molten steel and the Al_(2)O_(3)-C substrates with O and 8 wt.% nano-carbon black content,and the contact angle deceased with time.When the content of nano-carbon black was 12 wt.%,a large number of nano-Al_(2)O_(3) whiskers were observed,which made the contact angle between the molten steel and Al_(2)O_(3)-C substrate become large.Based on the scanning electron microscope and energy dispersive spectrometry results,the formation mechanism of FeAl2O4 layer and Al_(2)O_(3) layer and the interfacial reaction mechanism were proposed. 展开更多
关键词 Contact angle nano-carbon black Al_(2)O_(3)-C substrate Molten steel Interfacial reaction
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废轮胎热解炭黑(TPCB)改性沥青抗紫外老化性能试验研究 被引量:1
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作者 杨晚生 易帅兵 +2 位作者 戴天乐 李甜甜 甘有为 《中外公路》 2024年第2期103-109,共7页
为探讨废轮胎热解炭黑(TPCB)改性沥青抗紫外老化性能,制备TPCB改性沥青,对基质沥青和TPCB改性沥青进行不同时段的紫外老化试验。通过原子力显微镜(AFM)试验对比研究两种沥青表面的微观变化和表面粗糙度。通过沥青性能试验检验了两种沥... 为探讨废轮胎热解炭黑(TPCB)改性沥青抗紫外老化性能,制备TPCB改性沥青,对基质沥青和TPCB改性沥青进行不同时段的紫外老化试验。通过原子力显微镜(AFM)试验对比研究两种沥青表面的微观变化和表面粗糙度。通过沥青性能试验检验了两种沥青紫外老化前后延度、软化点、针入度变化行为。研究结果表明:TPCB改性沥青三维表观形貌图降低高度比基质沥青小,在各时间段的表面粗糙度比基质沥青大;紫外老化前后TPCB改性沥青性能变化值比基质沥青小。与基质沥青相比,TPCB改性沥青具有更好的抗紫外老化性能。 展开更多
关键词 废轮胎热解炭黑(TPCB)改性沥青 紫外老化试验 微观形貌 沥青表面粗糙度 沥青性能
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黑磷烯改性膜的制备及其锂硫电池性能
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作者 王晨瑶 翁海瑞 +4 位作者 李明娟 孙陆毅 杨惟韧 李媛 陈鑫智 《电源技术》 CAS 北大核心 2024年第8期1572-1579,共8页
锂硫电池因其高能量密度、低成本、无毒性等优点,在电池领域备受瞩目,被认为是最具有开发潜力的电池之一。但锂硫电池的应用一直受到容量衰减严重的困扰,这主要源自于多硫化物的严重穿梭效应。为解决这个问题,通过合成黑磷烯对商用聚丙... 锂硫电池因其高能量密度、低成本、无毒性等优点,在电池领域备受瞩目,被认为是最具有开发潜力的电池之一。但锂硫电池的应用一直受到容量衰减严重的困扰,这主要源自于多硫化物的严重穿梭效应。为解决这个问题,通过合成黑磷烯对商用聚丙烯隔膜进行改性,探究黑磷烯对锂硫电池性能的影响。结果发现,黑磷烯与商用隔膜具有良好的粘附性,改性后提高了隔膜吸液率,加快了离子在电解液中的扩散,有效抑制了穿梭效应。黑磷烯改性隔膜的锂硫电池在0.05 C下的首次放电比容量可达943 mAh/g,且在0.1 C下稳定循环超过200次,电池的性能得到显著提升。 展开更多
关键词 锂硫电池 黑磷烯 改性隔膜 穿梭效应
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镧镁改性海泡石微球对黑臭水体中磷的吸附性能评价
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作者 徐卓锐 陈超荣 +2 位作者 田高峰 杨博文 葛飞 《净水技术》 CAS 2024年第2期152-161,197,共11页
磷是黑臭水体形成过程中的关键影响因素之一,如何绿色高效控磷是实现黑臭水体治理的重要途径。研究以我国储量丰富的天然海泡石为原料,通过共沉淀-悬浮液滴法制得镧镁改性海泡石凝胶微球(La/Mg-SEPM)。考察了纤维素(MCC)、海藻酸钠(SA)... 磷是黑臭水体形成过程中的关键影响因素之一,如何绿色高效控磷是实现黑臭水体治理的重要途径。研究以我国储量丰富的天然海泡石为原料,通过共沉淀-悬浮液滴法制得镧镁改性海泡石凝胶微球(La/Mg-SEPM)。考察了纤维素(MCC)、海藻酸钠(SA)、镧镁改性海泡石(La/Mg-SEP)在La/Mg-SEPM中的质量配比、La/Mg-SEPM的投加量、水样pH、环境温度和吸附时间对磷吸附过程的影响,并结合表征分析探究了La/Mg-SEPM对黑臭水体中总磷的吸附机制。结果表明,当MCC、SA、La/Mg-SEP的质量配比为2∶2∶1,La/Mg-SEPM投加量为1.0 g/L时,La/Mg-SEPM对总磷的最大吸附量达21.03 mg/g,约为天然海泡石的11倍,在水样pH值为5~9、环境温度为5~25℃均表现出良好的磷吸附性能;La/Mg-SEPM具有较好的沉降性能,循环使用4次后仍能将水样中总磷质量浓度降至0.2 mg/L以下。经La/Mg-SEPM处理后的实际轻度和重度黑臭水样中总磷均能达到《地表水环境质量标准》(GB 3838—2002)地表水Ⅲ类水质总磷的标准限值。La/Mg-SEPM对磷的吸附主要为化学吸附控制的单层吸附过程,磷吸附机制主要涉及配体交换与表面沉淀。 展开更多
关键词 镧镁改性海泡石 凝胶微球 黑臭水体 总磷 吸附
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基于文献计量学分析生物碳在黑土改良中的应用研究现状
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作者 苟鹏飞 胡志强 +3 位作者 杨建雨 关卫东 胡啸天 王永亮 《现代农业研究》 2024年第2期1-5,共5页
本文以“中国知网”为资源库,利用文献计量学的方法分析生物碳在黑土改良中的研究现状,挖掘梳理关于“生物碳”“黑土”相关研究成果,总结了该领域的现状、热点与发展趋势。分析发现生物碳在黑土改良方面具有广阔的应用前景,近年该领域... 本文以“中国知网”为资源库,利用文献计量学的方法分析生物碳在黑土改良中的研究现状,挖掘梳理关于“生物碳”“黑土”相关研究成果,总结了该领域的现状、热点与发展趋势。分析发现生物碳在黑土改良方面具有广阔的应用前景,近年该领域研究成果呈现出快速增长的态势,研究热点主要集中在生物碳如何影响黑土物理性质、化学性质,如何调控微生物群落结构以及生物碳应用于黑土改良的作用效果等。整体而言,未来的研究应该更加关注生物碳对不同微生物作用机制,探究其对黑土质量和农作物产量的影响机理,为黑土的保护和农业可持续发展提供更加科学的理论基础,也应该在生物碳的应用和推广方面进行更多的实践和探索,以实现生物碳的最大效益。 展开更多
关键词 生物碳 改良 黑土
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环糊精改性炭黑的制备及对苯酚类的吸附性能
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作者 宋莹 李琳 陈建 《辽宁化工》 CAS 2024年第2期173-176,共4页
采用HNO_(3)对炭黑N115进行氧化改性后接枝环糊精,制备环糊精改性炭黑材料,经FT-IR、SEM及TG等方法证实成功改性。将炭黑材料用于对酚类的吸附性研究,考察炭黑用量、温度及时间等因素对邻甲酚、对甲酚与双酚A去除率的影响关系。结果表明... 采用HNO_(3)对炭黑N115进行氧化改性后接枝环糊精,制备环糊精改性炭黑材料,经FT-IR、SEM及TG等方法证实成功改性。将炭黑材料用于对酚类的吸附性研究,考察炭黑用量、温度及时间等因素对邻甲酚、对甲酚与双酚A去除率的影响关系。结果表明,环糊精改性炭黑对三种酚的吸附率明显提升,最佳条件为:时间为40 min,用量12 mg,温度40℃,其主要吸附机制是环糊精对双酚A的强包结作用。 展开更多
关键词 环糊精 炭黑改性 苯酚类 吸附
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导电炭黑材料在聚氯乙烯管材生产中的应用
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作者 李银鸿 《科技创新与应用》 2024年第19期56-59,共4页
该文探讨国产导电炭黑在煤矿井下用聚氯乙烯管材生产工艺中的关键实验步骤和参数。实验分为试片试验和生产试验2部分。试片试验使用X(S)K-400型开炼机、YXE-100T型平板硫化机和ZC-90高绝缘电阻测量仪进行,以评估导电炭黑对管材导电性的... 该文探讨国产导电炭黑在煤矿井下用聚氯乙烯管材生产工艺中的关键实验步骤和参数。实验分为试片试验和生产试验2部分。试片试验使用X(S)K-400型开炼机、YXE-100T型平板硫化机和ZC-90高绝缘电阻测量仪进行,以评估导电炭黑对管材导电性的影响。实验结果表明导电炭黑符合标准要求。生产试验则使用高速搅拌机、冷却搅拌机、双螺杆挤出机和电阻测量仪,确保管材的导电性、物理性能和稳定性。实验还涵盖所使用的聚氯乙烯树脂和其他实验相关助剂,如抗冲改性剂、加工助剂、稳定剂、润滑剂和填充剂,它们对管材性能的调整至关重要。 展开更多
关键词 国产导电炭黑 聚氯乙烯管材 生产工艺 电阻特性 抗冲改性剂
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