检索结果-南通市图书馆

ZnIn_(2)S_(4)-based S-scheme heterojunction photocatalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第36期167卷 184-204页

作者： Xinhe Wu Guoqiang Chen Liangting Li Juan wang guohong wang Hubei Key Laboratory of Pollutant Analysis and Reuse Technology College of Chemistry and Chemical EngineeringHubei Normal UniversityHuangshi 435002China

Photocatalytic technologies have been universally applied in the domains of hydrogen production,envi-ronmental purification,CO_(2)reduction,catalytic organic synthesis,and other major fields owing to their environmental friendliness,convenient operation,and absorbing sunlight as the driving force.The core of photocatalytic technology is photocatalyst.Hence,it is greatly essential to fabricate stable,high-efficiency,and visible-light response photocatalysts.Among various visible-light-response photocatalysts,ZnIn_(2)S_(4),a ternary metal sulfide,has attracted extensive attention due to its prominent advantages of simple synthe-sis,excellent stability,and appropriate band structure.However,the low utilization of solar energy and rapid recombination of photogenerated charges as same as inferior redox capacity are still the distinct shortcomings that significantly block the increase of photocatalytic efficiency for ZnIn_(2)S_(4)photocatalyst.Fortunately,the above evident shortcomings can be simultaneously resolved by constructing heterojunc-tions between ZnIn_(2)S_(4)with other semiconductors.In recent years,various semiconductor photocatalysts(such as oxides(TiO_(2),WO_(3),In_(2)O_(3)),sulfides(ZnS,FeS_(2),CoS),oxysalts(Bi_(2)MoO_(6),ZnWO_(4),NaTaO_(3)),organics(g-C_(3)N_(4),COF,PDIIM),etc.)have been combined with ZnIn_(2)S_(4)to construct ZnIn_(2)S_(4)-based S-scheme het-erojunctions with the aim at greatly increasing its photocatalytic efficiency.Herein,this review presents a systematic description of the currently popular ZnIn_(2)S_(4)-based S-scheme heterojunction photocatalyst,which includes the research background,scientific mechanism,design principles,preparation strategies,and characterization methods of ZnIn_(2)S_(4)-based S-scheme heterojunctions.Moreover,the extensive pho-tocatalytic applications of ZnIn_(2)S_(4)-based S-scheme heterojunctions have been detailly described by clas-sification examples,including hydrogen production,CO_(2)reduction,environmental purification,and other applications.Finally,sev

关键词： Photocatalysis ZnIn_(2)S_(4) Heterojunction S-scheme Applications

Atomic-level insight of sulfidation-engineered Aurivillius-related Bi_(2)O_(2)SiO_(3) nanosheets enabling visible light low-concentration CO_(2) conversion

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Carbon Energy 2023年第2期5卷 1-11页

作者： Kai wang Yue Du Yuan Li Xiaoyong Wu Haiyan Hu guohong wang Yao Xiao Shulei Chou Gaoke Zhang College of Urban and Environmental Sciences Hubei Key Laboratory of Pollutant Analysis and Reuse TechnologyInstitute for Advanced MaterialsHubei Normal UniversityHuangshiHubeiChina School of Resources and Environmental Engineering Wuhan University of TechnologyWuhanHubeiChina Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhouZhejiangChina

Unraveling atomic-level active sites of layered photocatalyst towards lowconcentration CO_(2) conversion is still challenging.Herein,the yield and selectivity of photocatalytic CO_(2) reduction of the Aurivillius-related oxide semiconductor Bi_(2)O_(2)SiO_(3) nanosheet(BOSO)were largely improved using a surface sulfidation strategy.The experiment and theoretical calculation confirmed that surface sulfidation of the Bi_(2)O_(2)SiO_(3) nanosheet(S-BOSO,6.28 nm)redistributed the charge-enriched Bi sites,extended the solar spectrum absorption to the whole visible range,and considerably enhanced the charge separation,in addition to creating new reaction active sites,as compared to pristine BOSO.Subsequently,surface sulfidation played a switchable role,wherein S-BOSO showed a very high CH_(3)OH generation rate(12.78μmol g^(-1) for 4 h,78.6%selectivity)from low-concentration CO_(2)(1000 ppm)under visible light irradiation,which outperforms most of the state-of-the-art photocatalysts under similar conditions.This study presents an atomic-level modification protocol for engineering reactive sites and charge behaviors to promote solar-to-energy conversion.

关键词： [Bi_(2)O_(2)]^(2)+layer Bi_(2)O_(2)SiO_(3) low-concentration CO_(2)reduction photocatalysis sulfidation

选区激光熔化成形NiTi合金工艺参数对表面粗糙度的影响规律

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

表面技术 2024年第9期53卷 200-208页

作者：王俊伟贺定勇吴旭王国红北京工业大学材料科学与工程学院北京100124

目的针对选区激光熔化(SLM)制备NiTi形状记忆合金表面粗糙度难以满足实际应用要求,通过优化工艺参数(激光功率、扫描速度、扫描间距)以有效地降低表面粗糙度以及研究各工艺参数对表面粗糙度的影响规律。方法采用L16正交阵列的田口模型... 详细信息

目的针对选区激光熔化(SLM)制备NiTi形状记忆合金表面粗糙度难以满足实际应用要求,通过优化工艺参数(激光功率、扫描速度、扫描间距)以有效地降低表面粗糙度以及研究各工艺参数对表面粗糙度的影响规律。方法采用L16正交阵列的田口模型设计选区激光熔化制备NiTi样品的工艺参数,通过对表面粗糙度信噪比值进行统计方法分析以及样品表面形貌的表征,研究不同工艺参数对表面粗糙度的影响程度以及影响机理,最终优化出制备低表面粗糙度的工艺参数组合。结果在激光功率为20 W和30 W时,NiTi粉末不能够充分熔化造成熔道不连续,使得样品表面起伏增大,粗糙度值最大到7.8μm;增大激光功率到40W和50W时,粉末充分熔化,样品表面形貌明显改善;在相同功率下,扫描速度从200mm/s增加到500mm/s时,样品的粗糙度值也随之增大。结论工艺参数对表面粗糙度影响的重要性顺序依次为激光功率、扫描速度、扫描间距;最终优化出的工艺参数组合为激光功率50W、扫描速度200mm/s、扫描间距0.07mm,并在该工艺参数下制备的样品表面粗糙度值为1.38μm,与模型预测的值1.43μm接近,相差仅为9.97%。

关键词：选区激光熔化 NiTi形状记忆合金田口方法表面粗糙度工艺优化

维普期刊数据库博看期刊

Highly maneuvering target tracking using multi-parameter fusion Singer model

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2017年第5期28卷 841-850页

作者： Shuyi Jia Yun Zhang guohong wang Research Institute of Information Fusion Naval Aeronautical and Astronautical University Department of Aircraft Engineering Naval Aeronautical and Astronautical University

An algorithm of highly maneuvering target tracking is proposed to solve the problem of large tracking error caused by strong maneuver. In this algorithm, a new estimator, named as multi-parameter fusion Singer (MF-Singer) model is derived based on the Singer model and the fuzzy reasoning method by using radial acceleration and velocity of the target, and applied to the problem of maneuvering target tracking in strong maneuvering environment and operating environment. The tracking performance of the MF-Singer model is evaluated and compared with other manuevering tracking models. It is shown that the MF-Singer model outperforms these algorithms in several examples.

关键词： maneuvering target multi-parameter fusion Singer (MF-Singer) fuzzy reasoning Singer model

Radial acceleration estimation of multiple high maneuvering targets

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2014年第2期25卷 183-193页

作者： Shuyi Jia guohong wang Shuncheng Tan Institute of Information Fusion Naval Aeronautical and Astronautical University

The acceleration of a high maneuvering target in signal processing is helpful to enhance the performance of the tracker and facilitate the classification of targets. At present, most of the research on acceleration estimation is carried out in cases of a single target with time-frequency analysis methods such as fractional Fourier transform （FRFT）, Hough-ambiguity transform （HAT）, and Wigner-Vil e distribution （WVD）, which need to satisfy enough time duration and sampling theorem. Only one reference proposed a method of acceleration estimation for multiple targets based on modified polynomial phase transform （MPPT） in the lin-ear frequency modulation （LFM） continuous-wave （CW） radar. The method of acceleration estimation for multiple targets in the pulse Doppler （PD） radar has not been reported so far. Compressive sensing （CS） has the advantage of sampling at a low rate and short duration without sacrificing estimation performance. There-fore, this paper proposes a new method of acceleration estimation for multiple maneuvering targets with the unknown number based on CS with pulse Doppler signals. Simulation results validate the effectiveness of the proposed method under several conditions with different duration, measurement numbers, signal to noise ra-tios （SNR）, and regularization parameters, respectively. Simulation results also show that the performance of the proposed method is superior to that of FRFT and HAT in the condition of multiple targets.

关键词： radial acceleration compressive sensing （CS） highmaneuvering targets fractional Fourier transform （FRFT） Hough-ambiguity transform （HAT）.

Effect of biased estimation on radar-to-ESM track association

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2012年第2期23卷 188-194页

作者： guohong wang Xiangyu Zhang Shuncheng Tan Institute of Information Fusion Naval Aeronautical and Astronautical UniversityYantai 264001R R.China

The track association problem of radar and electronic support measure （ESM） has been considered in the literature for several years. This problem is crucial for radar-to-ESM track fusion and is complicated by the presence of individual systematic errors and measurement errors. In order to improve the track association of radar and ESM sensors, a pseudo-linear filtering algorithm is proposed to estimate the target states and improve the stability of the filter. It is found that, however, the correct probability of radar- to-ESM track association decreases as the radar measurement error decreases, when the pseudo-linear filter is used for ESM sensor filtering. In view of the strange phenomenon, this paper analyzes the reason for it by using the statistic theory and further performs Monte Carlo simulation to verify the analysis.

关键词： radar electronic support measure （ESM） track asso- ciation bias.

A novel RHT-TBD approach for weak targets in HPRF radar

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2016年第12期59卷 59-72页

作者： Hongbo YU guohong wang Wei WU Shuncheng TAN Institute of Information Fusion Naval Aeronautical and Astronautical University

A novel approach, which can handle ambiguous data from weak targets, is proposed within the randomized Hough transform track-before-detect(RHT-TBD) framework. The main idea is that, without the pre-detection and ambiguity resolution step at each time step, the ambiguous measurements are mapped by the multiple hypothesis ranging(MHR) procedure. In this way, all the information, based on the relativity in time and pulse repetition frequency(PRF) domains, can be gathered among different PRFs and integrated over time via a batch procedure. The final step is to perform the RHT with all the extended measurements, and the ambiguous data is unfolded while the detection decision is confirmed at the end of the processing chain.Unlike classic methods, the new approach resolves the problem of range ambiguity and detects the true track for targets. Finally, its application is illustrated to analyze and compare the performance between the proposed approach and the existing approach. Simulation results exhibit the effectiveness of this approach.

关键词：弱目标高重频脉冲重复频率检测前跟踪模糊度解算批处理程序雷达距离模糊

The structure of the compound eyes and phototaxis in two phenotypes of the bean pest Callosobruchus maculatus(Coleoptera:Bruchinae)

在线全文

学校读者我要写书评

暂无评论

动物分类学报:英文版 2023年第3期48卷 193-205页

作者： Zhong Du Tianhao Zhang Fengming Wu Zulong Liang Xiaokun Liu Muinde Jacob Weili Fan Lei Jiang Lijie Zhang Siqin Ge guohong wang College of Life Sciences Fujian Normal UniversityProvincial University Key Laboratory of Cellular Stress Response and Metabolic RegulationCollege of Life SciencesFuzhou 350108China Key Laboratory of Zoological Systematics and Evolution Institute of ZoologyChinese Academy of SciencesBeijing 100101China Science and Technical Research Center of China Customs Beijing 100026China University of Chinese Academy of Sciences Beijing 100049China

Callosobruchus maculatus(Fabricius,1775)(Coleoptera:Bruchinae)is a destructive agricultural pest that is harmful to beans worldwide and an important quarantine pest in China.It was divided into two phenotypes based on polyphenism:normal and flight forms.In this study,we first compared the morphological structures of the compound eyes of the two forms.According to the results of scanning electron microscopy(SEM),transmission electron microscopy(TEM),microcomputed tomography(micro-CT),and computer three-dimensional reconstruction,there are no differences in the structures of the compound eyes between the normal and flight forms except for the number of ommatidia.From the internal structure,the compound eyes have a biconvex cornea with open rhabdom and acone eye,crystalline cone directly connected with rhabdom,and no clear zone.It is a kind of apposition eye.Ommatidia facets range in shape from quadrilateral to hexagonal and some irregular shapes.On electroretinograms(ERGs),the normal and flight forms showed different spectral sensitivities:the normal form had the strongest response to ultraviolet light,whereas the flight form had the strongest response to white light.Behavioral assays revealed that the normal and flight forms showed completely opposite phototaxis behaviors;the flight form exhibited positive phototaxis,whereas the normal form exhibited negative phototaxis.This study not only enriches our knowledge on coleopteran compound eyes but also provides a foundation for in-depth research on the photoreceptor mechanisms of compound eyes,which may be useful in pest control management.

关键词： Polyphenism cowpea weevil morphology photopreference electroretinogram

Distribution and drug resistance of pathogenic bacteria isolated from cancer hospital in 2013

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer Research 2014年第6期26卷 698-704页

作者： Linjuan Liu Qi Li Qingyun Zhang guohong wang Guobin Xu Ji Zhang Department of Laboratory Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education) Peking University Cancer Hospital & Institute Department of Infection Management Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education) Peking University Cancer Hospital & Institute

Objective： To understand distribution and drug resistance of pathogenic bacteria from a specialized cancer hospital in 2013 in order to provide a basis for rational clinical antimicrobial agents. Methods： Pathogenic bacteria identification and drug sensitivity tests were performed with a VITEK 2 compact automatic identification system and data were analyzed using WHONET5.6 software.Results： Of the 1,378 strains tested, 980 were Gram-negative bacilli, accounting for 71.1%, in which Klebsiella pneumonia, Escherichia coli and Pseudomonas aeruginosa were the dominant strains. We found 328 Gram-positive coccus, accounting for 23.8%, in which the amount of Staphylococcus aureus was the highest. We identified 46 fungi, accounting for 4.1%. According to the departmental distribution within the hospital, the surgical departments isolated the major strains, accounting for 49.7%. According to disease types, lung cancer, intestinal cancer and esophagus cancer were the top three, accounting for 20.9%, 17.3% and 14.2%, respectively. No strains were resistant to imipenem, ertapenem or vancomycin.Conclusions： Pathogenic bacteria isolated from the specialized cancer hospital have different resistance rates compared to commonly used antimicrobial agents; therefore antimicrobial agents to reduce the morbidity and mortality of infections should be used.

关键词： Tumor pathogenic bacteria distribution drug resistance rate