|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Effect of Preparation Method on the Structural Characteristics of NiO-ZrO2 Oxygen Carriers for Chemical-looping Combustion显示文摘Chemical-looping combustion(CLC)offers an effective approach for power generation and CO2 capture.In this work,an NiO-ZrO2 oxygen carrier prepared by three methods was subjected to an optimal reaction temperature test,an optimal flow test and a cyclic redox reaction test to explore the most suitable reaction conditions.Through comparative analysis,it is noted that the coprecipitation method is not suitable for the preparation of this NiO-ZrO2 oxygen carrier,while the oxygen carrier prepared by the mechanical mixing method and solution combustion method obtained a higher CH4 conversion rate and CO2 selectivity.In addition,these two oxygen carriers also showed high stability during successive CLC testing.Therefore,both the mechanical mixing method and the solution combustion method can be used to prepare NiO-ZrO2 oxygen carriers. | LIU Yike LONG Yanhui TANG Yaqin GU Zhenhua LI Kongzhai | 2019 | Chemical Research in Chinese Universities2019，35，6： | 2 |
| 2 | Hydrogen production via chemical looping reforming of coke oven gas显示文摘Coke oven gas(COG)is one of the most important by-products in steel industry,and the conversion of COG to value-added products has attracted much attention from both economic and environmental views.In this work,we use the chemical looping reforming technology to produce pure H_(2) from COG.A series of La1-xSrxFeO_(3)(x?0,0.2,0.3,0.4,0.5,0.6)perovskite oxides were prepared as oxygen carriers for this purpose.The reduction behaviors of La1-xSrxFeO_(3) perovskite by different reducing gases(H_(2),CO,CH4 and the mixed gases)are investigated to discuss the competition effect of different components in COG for reacting with the oxygen carriers.The results show that reduction temperatures of H_(2) and CO are much lower than that of CH4,and high temperatures(>800℃)are requested for selective oxidation of methane to syngas.The co-existence of CO and H_(2) shows weak effect on the equilibrium of methane conversion at high temperatures,but the oxidation of methane to syngas can inhibit the consumption of CO and H_(2).The doping of suitable amounts of Sr in LaFeO_(3) perovskite(e.g.,La0.5Sr0.5FeO_(3))significantly promotes the activity for selective oxidation of methane to syngas and inhibits the formation of carbon deposition,obtaining both high methane conversion in the COG oxidation step and high hydrogen yield in the water splitting step.The La0.5Sr0.5FeO_(3) shows the highest methane conversion(67.82%),hydrogen yield(3.34 mmol g^(-1))and hydrogen purity(99.85%).The hydrogen yield in water splitting step is treble as high as the hydrogen consumption in reduction step.These results reveal that chemical looping reforming of COG to produce pure H_(2) is feasible,and an O_(2)-assistant chemical looping reforming process can further improves the redox stability of oxygen carrier. | Kun Yang Zhenhua Gu Yanhui Long Shen Lin Chunqiang Lu Xing Zhu Hua Wang Kongzhai Li | 2021 | Green Energy & Environment2021，6，5： | 2 |
| 3 | Achieving a sub-10 nm nanopore array in silicon by metal-assisted chemical etching and machine learning显示文摘Solid-state nanopores with controllable pore size and morphology have huge application potential.However,it has been very challenging to process sub-10 nm silicon nanopore arrays with high efficiency and high quality at low cost.In this study,a method combining metal-assisted chemical etching and machine learning is proposed to fabricate sub-10 nm nanopore arrays on silicon wafers with various dopant types and concentrations.Through a SVM algorithm,the relationship between the nanopore structures and the fabrication conditions,including the etching solution,etching time,dopant type,and concentration,was modeled and experimentally verified.Based on this,a processing parameter window for generating regular nanopore arrays on silicon wafers with variable doping types and concentrations was obtained.The proposed machine-learning-assisted etching method will provide a feasible and economical way to process high-quality silicon nanopores,nanostructures,and devices. | Yun Chen Yanhui Chen Junyu Long Dachuang Shi Xin Chen Maoxiang Hou Jian Gao Huilong Liu Yunbo He Bi Fan Ching-Ping Wong Ni Zhao | 2021 | International Journal of Extreme Manufacturing2021，3，3： | 2 |
| 4 | Monitoring wind turbine gearboxes显示文摘 | Yanhui Feng Yingning Qiu Christopher J. Crabtree Hui Long Peter J. Tavner | 2013 | Wind Energ2013，，5： | 1 |
| 5 | Improving Chinese Word Representation with Conceptual Semantics显示文摘The meaning of a word includes a conceptual meaning and a distributive meaning.Word embedding based on distribution suffers from insufficient conceptual semantic representation caused by data sparsity,especially for low-frequency words.In knowledge bases,manually annotated semantic knowledge is stable and the essential attributes of words are accurately denoted.In this paper,we propose a Conceptual Semantics Enhanced Word Representation(CEWR)model,computing the synset embedding and hypernym embedding of Chinese words based on the Tongyici Cilin thesaurus,and aggregating it with distributed word representation to have both distributed information and the conceptual meaning encoded in the representation of words.We evaluate the CEWR model on two tasks:word similarity computation and short text classification.The Spearman correlation between model results and human judgement are improved to 64.71%,81.84%,and 85.16%on Wordsim297,MC30,and RG65,respectively.Moreover,CEWR improves the F1 score by 3%in the short text classification task.The experimental results show that CEWR can represent words in a more informative approach than distributed word embedding.This proves that conceptual semantics,especially hypernymous information,is a good complement to distributed word representation. | Tingxin Wei Weiguang Qu Junsheng Zhou Yunfei Long Yanhui Gu Zhentao Xia | 2020 | Computers, Materials & Continua2020，，9： | 1 |
| 6 | Hybrid Neural Network for Automatic Recovery of Elliptical Chinese Quantity Noun Phrases显示文摘In Mandarin Chinese,when the noun head appears in the context,a quantity noun phrase can be reduced to a quantity phrase with the noun head omitted.This phrase structure is called elliptical quantity noun phrase.The automatic recovery of elliptical quantity noun phrase is crucial in syntactic parsing,semantic representation and other downstream tasks.In this paper,we propose a hybrid neural network model to identify the semantic category for elliptical quantity noun phrases and realize the recovery of omitted semantics by supplementing concept categories.Firstly,we use BERT to generate character-level vectors.Secondly,Bi-LSTM is applied to capture the context information of each character and compress the input into the context memory history.Then CNN is utilized to capture the local semantics of n-grams with various granularities.Based on the Chinese Abstract Meaning Representation(CAMR)corpus and Xinhua News Agency corpus,we construct a hand-labeled elliptical quantity noun phrase dataset and carry out the semantic recovery of elliptical quantity noun phrase on this dataset.The experimental results show that our hybrid neural network model can effectively improve the performance of the semantic complement for the elliptical quantity noun phrases. | Hanyu Shi Weiguang Qu Tingxin Wei Junsheng Zhou Yunfei Long Yanhui Gu Bin Li | 2021 | Computers, Materials & Continua2021，，12： | 0 |
| 7 | Crystal structure and catalytic mechanism of the MbnBC holoenzyme required for methanobactin biosynthesis显示文摘Methanobactins(Mbns)are a family of copper binding peptides involved in copper uptake by methanotrophs,and are potential therapeutic agents for treating diseases characterized by disordered copper accumulation.Mbns are produced via modification of MbnA precursor peptides at cysteine residues catalyzed by the core biosynthetic machinery containing MbnB,an iron-dependent enzyme,and MbnC.However,mechanistic details underlying the catalysis of the MbnBC holoenzyme remain unclear.Here,we present crystal structures of MbnABC complexes from two distinct species,revealing that the leader peptide of the substrate MbnA binds MbnC for recruitment of the MbnBC holoenzyme,while the core peptide of MbnA resides in the catalytic cavity created by the MbnB-MbnC interaction which harbors a unique tri-iron cluster.Ligation of the substrate sulfhydryl group to the tri-iron center achieves a dioxygen-dependent reaction for oxazolone thioamide installation.Structural analysis of the MbnABC complexes together with functional investigation of MbnB variants identifed a conserved catalytic aspartate residue as a general base required for MbnBC-mediated MbnA modifcation.Together,our study reveals the similar architecture and function of MbnBC complexes from different species,demonstrating an evolutionarily conserved catalytic mechanism of the MbnBC holoenzymes. | Chao Dou Zhaolin Long Shoujie Li Dan Zhou Ying Jin Li Zhang Xuan Zhang Yanhui Zheng Lin Li Xiaofeng Zhu Zheng Liu Siyu He Weizhu Yan Lulu Yang Jie Xiong Xianghui Fu Shiqian Qi Haiyan Ren She Chen Lunzhi Dai Binju Wang Wei Cheng | 2022 | Cell Research2022，32，3： | 0 |
| 8 | Twin crystal structured Al-10 wt.% Mg alloy over broad velocity conditions achieved by high thermal gradient directional solidification显示文摘Twin crystal structured Al-10 wt.% Mg alloys that were grown over a broad solidification velocity range were prepared and studied for the first time.The high thermal gradient(G)and growth velocity(V)of directional solidification resulted in the dominant solidification of twins:the twinned dendrite trunks at constant high Vs curved in the G direction with large angles in 7 mm diameter crucibles and invaded regular columnar grains because of a distinct kinetics growth advantage.Transitive deceleration experiments were designed to produce twin crystals that evolved with lower values of V(100,10,and 0.5μm/s)and had a structural coarsening trend.Twin cell growth in the absence of arms occurred at a growth velocity of 10μm/s.A coherency loss was observed at a growth velocity of 0.5μm/s with straight coherent twin boundaries turning into curved incoherent boundaries.Linear theoretical analyses were performed to understand the structural evolution of the twins.These results demonstrate the possibility of producing dense and controlled twin crystals in the Al-Mg system under most industrial production conditions;thus,this approach can be a new structural choice for designing Al-Mg-based alloys that have widespread commercial applications. | Luyan Yang Shuangming Li Kai Fan Yang Li Yanhui Chen Wei Li Deli Kong Pengfei Cao Haibo Long Ang Li | 2021 | Journal of Materials Science & Technology2021，，12： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员