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Potentials of using dietary plant secondary metabolites to mitigate nitrous oxide emissions from excreta of cattle:Impacts,mechanisms and perspectives

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Animal Nutrition 2022年第2期9卷 327-334页

作者： jian gao Guangyong Zhao State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural University100193 BeijingChina

Nitrous oxide(N_(2)O)is a potent greenhouse gas as well as the key component depleting the ozone sphere of the *** have high feed and water intakes and excrete large amounts of urine and feces.N_(2)O can be produced from cattle excreta during storage and use as *** the N_(2)O emissions from cattle excreta during production is important for protecting the environment and the sustainable development of the cattle *** cattle with low-protein diets increases N utilization rates,decreases N excretion and consequently reduces N_(2)O ***,this approach cannot be applied in the long term because of its negative impact on animal *** studies showed that dietary inclusion of some plant secondary metabolites such as tannins,anthocyanins,glucosinolates and aucubin could manipulate the N excretion and the urinary components and consequently regulate N_(2)O emissions from cattle *** review summarized the recent developments in the effects of dietary tannins,anthocyanins and glucosinolates on the metabolism of cattle and the N_(2)O emissions from cattle excreta and concluded that dietary inclusion of tannins or anthocyanins could considerably reduce N_(2)O emissions from cattle excreta.

关键词： Anthocyanin Aucubin Cattle Glucosinolate Nitrous oxide Tannin

Good Linear Codes from Quadratic Residue Codes over a Finite Non-Chain Ring

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Chinese Journal of Electronics 2017年第4期26卷 773-777页

作者： gao jian MA Fanghui School of Science Shandong University of Technology

This paper is devoted to the study of quadratics residue codes and their extended codes over a finite non-chain ring. A class of Gray maps preserving the self-duality from the ring to the finite field are *** structural properties of quadratic residue codes and their extended codes are given. As an interesting application of these families of codes, some good linear codes are obtained by a special Gray map.

关键词： Gray map Quadratic residue codes Good linear codes

Chinese Cyber Threat Intelligence Named Entity Recognition via RoBERTa-wwm-RDCNN-CRF

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Computers, Materials & Continua 2023年第10期77卷 299-323页

作者： Zhen Zhen jian gao School of Information Network Security People’s Public Security University of ChinaBeijing100038China Key Laboratory of Safety Precautions and Risk Assessment Ministry of Public SecurityBeijing102623China

In recent years,cyber attacks have been intensifying and causing great harm to individuals,companies,and *** mining of cyber threat intelligence(CTI)can facilitate intelligence integration and serve well in combating cyber *** Entity Recognition(NER),as a crucial component of text mining,can structure complex CTI text and aid cybersecurity professionals in effectively countering ***,current CTI NER research has mainly focused on studying English *** the limited studies conducted on Chinese text,existing models have shown poor *** fully utilize the power of Chinese pre-trained language models(PLMs)and conquer the problem of lengthy infrequent English words mixing in the Chinese CTIs,we propose a residual dilated convolutional neural network(RDCNN)with a conditional random field(CRF)based on a robustly optimized bidirectional encoder representation from transformers pre-training approach with whole word masking(RoBERTa-wwm),abbreviated as *** are the first to experiment on the relevant open source dataset and achieve an F1-score of 82.35%,which exceeds the common baseline model bidirectional encoder representation from transformers(BERT)-bidirectional long short-term memory(BiLSTM)-CRF in this field by about 19.52%and exceeds the current state-of-the-art model,BERT-RDCNN-CRF,by about 3.53%.In addition,we conducted an ablation study on the encoder part of the model to verify the effectiveness of the proposed model and an in-depth investigation of the PLMs and encoder part of the model to verify the effectiveness of the proposed *** RoBERTa-wwm-RDCNN-CRF model,the shared pre-processing,and augmentation methods can serve the subsequent fundamental tasks such as cybersecurity information extraction and knowledge graph construction,contributing to important applications in downstream tasks such as intrusion detection and advanced persistent threat(APT)attack detection.

关键词： Cybersecurity cyber threat intelligence named entity recognition

A highly efficient electrochemical route for the conversion of aldehydes to nitriles

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Science China Chemistry 2015年第4期58卷 747-750页

作者： Qinghui Qu Xiaofang gao jian gao gaoqing Yuan School of Chemistry and Chemical Engineering South China University of Technology

Using NH4 I as the supporting electrolyte as well as the precursor of an I2 promoter and nitrogen source, a highly efficient electrochemical route was developed to convert aldehydes to nitriles with excellent yields under mild reaction conditions. This electrochemical process could effectively avoid the direct use of NH3 gas, molecular iodine, and oxidants.

关键词： electrosynthesis nitriles aldehyde ammonia iodide

A randomized diversification strategy for solving satisfiability problem with long clauses

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Science China(Information Sciences) 2017年第9期60卷 121-131页

作者： jian gao Ruizhi LI Minghao YIN College of Computer Science Northeast Normal University College of Information Science and Technology Dalian Maritime University Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University

Satisfiability problem(SAT) is a central problem in artificial intelligence due to its computational complexity and usefulness in industrial applications. Stochastic local search(SLS) algorithms are powerful to solve hard instances of satisfiability problems, among which CScore SAT is proposed for solving SAT instances with long clauses by using greedy mode and diversification mode. In this paper, we present a randomized variable selection strategy to improve efficiency of the diversification mode, and thus propose a new SLS *** perform a number of experiments to evaluate the new algorithm comparing with the recently proposed algorithms, and show that our algorithm is comparative with others for solving random instances near the phase transition threshold.

关键词： SAT local search randomized diversification strategy phase transition long clause

Experimental analyses on phase transitions in compiling satisfiability problems

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Science China(Information Sciences) 2015年第3期58卷 80-90页

作者： gao jian WANG jianan YIN MingHao College of Information Science and Technology Dalian Maritime University College of Computer Science Northeast Normal University

In the past decade,a kind of well-known phenomena in many complex combinatorial problems such as satisfiability problem,called phase transition,have been widely *** this paper,the phase transition phenomena are investigated during compiling k-satisfiability problems into tractable languages with empirical *** binary decision diagram and deterministic-decomposable negation normal form are selected as the tractable target languages for the *** intensive experiments,it can be concluded that an easy–hard–easy pattern exists during the compilations,which is only related to the ratio of the number of clauses to that of variables if we set k to a fixed value,rather than to the target ***,it can be concluded that the space exhausted during the compilations grows exponentially with the number of variables growing,whereas there is also a phase transition separating the polynomial-increment region from the exponential-increment ***,it can be observed that there is a phase transition of prime implicants around peak points of the easy–hard–easy pattern and the ratios of random instances whose average lengths of prime implicants are larger than the threshold 0.5 change *** these analyses,it can be concluded that prime implicant length and solution interchangeability are crucial impacts on sizes of compilation results.

关键词： phase transition knowledge compilation random k-SAT prime implicants easy–hard–easy pattern

Mechanochemical reactions of GaN-Al_(2)O_(3) interface at the nanoasperity contact:Roles of crystallographic polarity and ambient humidity

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Friction 2022年第7期10卷 1005-1018页

作者： jian GUO jian gao Chen XIAO Lei CHEN Linmao QIAN School of Mechanical Engineering University of South ChinaHengyang 421001China Tribology Research Institute State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China Advanced Research Center for Nanolithography(ARCNL) Science Park 106Amsterdam 1098XGthe Netherlands Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province Southwest Jiaotong UniversityChengdu 610031China

Mechanochemical reactions of the GaN-Al_(2)O_(3) interface offer a novel principle for scientific and technological merits in the micro-/nano-scale ultra-precision surface *** this work,the mechanochemical reactions on Ga-and N-faced GaN surfaces rubbed by the Al_(2)O_(3) nanoasperity as a function of the environmental humidity were *** results indicate that the N-face exhibits much stronger mechanochemical removal over the relative humidity range of 20%-80%than the *** water molecules in environmental conditions significantly promotes the interfacial mechanochemical reactions and hence accelerates the atomic attrition on *** hypothesized mechanism of the selective water-involved mechanochemical removal is associated with the dangling bond configuration,which affects the mechanically-stimulated chemical reactions via altering the activation energy barrier to form the bonding bridge across the sliding *** findings can enrich the understanding of the underlying mechanism of mechanochemical reactions at GaN-Al_(2)O_(3) interface and a broad cognition for regulating the mechanochemical reactions widely existing in scientific and engineering applications.

关键词： crystallographic polarity ambient humidity mechanochemical removal GaN-Al_(2)O_(3)interface

Pretreatment of Polymer-Supported Pd-Co and Its Catalytic Activity

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Chinese Chemical Letters 2000年第8期11卷 743-744页

作者： Yan gao Shi jian LIAO Fu Dong WANG Yue gao Xi gao jian Department of Polymer Science&Materials Dalian University of TechnologyDalian 116012 Dalian Institute of Chemical Physics The Chinese Academy of SciencesDalian 116023

Various pretreatments of poly (N-vinyl-2-pyrrolidone) (PVP) protected palladium-cobalt system result in different catalytic activities in the hydrodechlorination of chlorobenzene.

关键词： pretreatment polymer supported Pd-Co catalytic activity

Effect of Initial Concentration on Adsorption-Desorption Characteristics and Desorption Hysteresis of Hexachlorobenzene in Soils

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Pedosphere 2010年第1期20卷 104-110页

作者： gao Hong-jian jianG Xin School of Resources and Environmental Science Anhui Agricultural University Hefei 230036 (China) State Key Lab of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 (China)

Adsorption and desorption are important processes that influence the transport, transformation, and bioavailability of hexachlorobenzene (HCB) in soils. To examine the adsorption-desorption characteristics of HCB, equilibrium batch experiments were carried out using two soils (red soil and paddy soil) with different initial HCB concentrations (0.25, 0.50, 0.75, 1.00, 1.50, 2.50, 3.50, and 5.00 mg L-1 ) by using 0.01 mol L-1 calcium chloride as the background solution. The successive desorption experiments (48, 96, 144, 192, and 240 h) were conducted after each adsorption equilibrium experiment. The results revealed that adsorption and desorption isotherms of HCB on two soils were nonlinear, which can be best described by the Freundlich equation with the square of the correlation coefficient (r 2 ) ranging from 0.97 to 0.99. Desorption of HCB from the two soils exhibited hysteresis at all HCB concentrations because the Freundlich desorption coefficients were always higher than the Freundlich adsorption coefficients. The hysteretic effect was enhanced with increasing initial HCB concentration, and positive hysteresis was observed at different concentrations.

关键词： Freundlich equation sorption coefficients sorption isotherms