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孔内多分段掏槽爆破数值模拟及实验研究

火工品 2025年第1期 83-88页

作者：冯婷夏治园杨帆陈欢罗国安杨士昌鲁海生郑州经贸学院河南郑州451191 安徽江南爆破工程有限公司安徽宣城242300

针对传统煤矿巷道掏槽爆破成本高、炮孔利用率低等问题,提出了一种孔内多分段掏槽爆破技术。通过采用ANSYS/AUTODYN数值模拟软件建立直眼掏槽、楔形掏槽和孔内多分段掏槽3组仿真模型,结合SPH算法进行仿真计算,对比分析了不同掏槽爆破模... 详细信息

针对传统煤矿巷道掏槽爆破成本高、炮孔利用率低等问题,提出了一种孔内多分段掏槽爆破技术。通过采用ANSYS/AUTODYN数值模拟软件建立直眼掏槽、楔形掏槽和孔内多分段掏槽3组仿真模型,结合SPH算法进行仿真计算,对比分析了不同掏槽爆破模型的进尺效果,并针对孔内多分段掏槽爆破方法进行了现场缩比实验。研究表明:孔内多分段掏槽爆破模型理论上具有改善掘进面掏槽区自由面形态、破除岩石夹制力、增强爆破作用力等多种优点;仿真结果显示孔内多分段掏槽模型炮孔利用率可达97%,高于直眼掏槽和楔形掏槽;现场缩比实验结果表明,孔内多分段掏槽爆破进尺效果良好,最高可达100%,充分证明了孔内多分段掏槽爆破技术的优越性。

关键词：孔内多分段掏槽数值模拟模型实验爆破漏斗

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Application of Fast Radical Rearrangement in the Mechanistic Investigation of Intramolecular C-H Insertion by Rh(Ⅱ)-Mediated Carbenoids

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Chinese Chemical Letters 1998年第8期9卷 701-704页

作者： Jian Bo WANG feng ting LIANG(Department of Chemistry, Peking University, Beijing 100871) Department of Chemistry Peking University Beijing 100871 China

In order to investigate the reaction mechanism of intramolecular C-H insertion by Rh(II)-mediated carbenoids with trans-(2-phenylcyclopropyl) carbinal radical as the mechanistic probe, diazo compounds 2-(2-phenylcyclopropyl)ethyl diazoacetoacetate 8a and methyl 2-diazo-3oxo-6-(2-phenylcyclopropyl) hexanoate 8b have been synthesized. Preliminary investigation of the intramolecular C-H insertion with Rh2(OAc)4 as catalyst supports a concerted insertion process.

关键词： Rh(Ⅱ)-mediated carbenoids intramolecular C-H insertion mechanism

Liquid pressure sensing system based on distributed polarization crosstalk analysis in polarization maintaining fiber

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Optoelectronics Letters 2022年第11期18卷 651-657页

作者： HE Zongjiang ZHANG Zeheng feng ting LI Qing YAO X Steve Photonics Information Innovation Center and Hebei Provincial Center for Optical Sensing Innovations College of Physics Science&TechnologyHebei UniversityBaoding 071002China NuVision Photonics Inc.Las Vegas 89109USA

A novel quasi-distributed liquid pressure sensing system based on distributed polarization crosstalk analysis(DPXA) in polarization maintaining fiber(PMF) is proposed and demonstrated. We design a special structure of liquid pressure sensing units and invent a corresponding nonlinear calibration method. Five sensing units deployed on a sensing tape can effectively transform the liquid pressure into the transverse-force applied on the sensing PMF, and the induced polarization crosstalk can be measured and located by the DPXA system, so as to further establish the relationship between liquid pressure and crosstalk through the nonlinear calibration method. The liquid pressure sensing system has good sensitivity and high repeatability, and a maximal measurement relative error of 8.96% is measured for the five sensing units, which can be much improved by optimizing the packaging of sensing units. We believe our sensing system will find great applications in the field of engineering liquid pressure sensing.

关键词： polarization fiber analysis

Well-dispersed Sb particles embedded on N-doped carbon nanofibers toward high-performance Li-ion battery

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Rare Metals 2024年第7期43卷 2994-3006页

作者： Ying Li Yi-Han Zhao Lu-Lu Zhao Peng-Fei Wang Ying Xie ting-feng Yi School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province School of Resources and MaterialsNortheastern University at QinhuangdaoQinhuangdao 066004China Key Laboratory of Functional Inorganic Material Chemistry Ministry of EducationSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China

The alloy-type material Sb is widely used in the anode materials of lithium-ion batteries(LIBs)due to its high theoretical specific ***,its serious volume expansion problem during alloying/dealloying of Li~+limits its practical *** this work,C-Sb composite was constructed as anode material of LIBs by electrospinning route for the first time,Sb was introduced into the polyacrylonitrile-based hard carbon and coal tar pitch-based soft carbon composite amorphous carbon fiber with a diameter of 300-600 nm,which realized high cycling *** C-Sb-2(the mass ratio of polyacrylonitrile to Sb source is 1:2)electrode displayed charge capacities of 1098.5,930.3,841.7,753.5,643.9 and 545.8 mAh·g^(-1)at 0.1,0.2,0.3,0.5,1 and 2 A·g^(-1),*** when the current density returned to 0.1 A·g^(-1),the charge capacity was 939.3 mAh·g^(-1),revealing good stability and *** introduction of Sb into the amorphous carbon improved its conductivity and addressed the volume expansion issue of high specific capacity Sb during charge/***-situ XRD analysis confirmed the high reversibility of the C-Sb-2 during charging and *** functional theory(DFT)calculations revealed the gradual enhancement of the interface interaction between Sb_(x)Li_(y) and amorphous carbon(AMC)with increasing lithium content,contributing to the anchoring of alloy nanoparticles on the AMC surface and buffering the volume change of the ***,the gradual lithiation of Sb facilitated the electron transfer from Sb_(x)Li_(y) to *** findings hold promise for designing lithium storage materials with exceptional performance,highlighting the potential of C-Sb composites as anode materials for efficient next-generation lithium storage.

关键词： Li-ion battery Metallic Sb Carbon Electrospinning Cycling stability

Clinical-radiomics predictors to identify the suitability of transarterial chemoembolization treatment in intermediate-stage hepatocellular carcinoma:A multicenter study

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Hepatobiliary & Pancreatic Diseases International 2023年第6期22卷 594-604页

作者： Dan-Dan Wang Jin-feng Zhang Lin-Han Zhang Meng Niu Hui-Jie Jiang Fu-Cang Jia Shi-ting feng Department of Radiology the Second Affiliated Hospital of Harbin Medical UniversityHarbin 150086China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055China Department of Breast Surgery Harbin Medical University Cancer HospitalHarbin 150081China Department of PET/CT the First Affiliated Hospital of Harbin Medical UniversityHarbin 150007China Department of Interventional Therapy the First Affiliated Hospital of China Medical UniversityShenyang 110001China Department of Radiology the First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510080China

Background: Although transarterial chemoembolization(TACE) is the first-line therapy for intermediatestage hepatocellular carcinoma(HCC), it is not suitable for all patients. This study aimed to determine how to select patients who are not suitable for TACE as the first treatment choice. Methods: A total of 243 intermediate-stage HCC patients treated with TACE at three centers were retrospectively enrolled, of which 171 were used for model training and 72 for testing. Radiomics features were screened using the Spearman correlation analysis and the least absolute shrinkage and selection operator(LASSO) algorithm. Subsequently, a radiomics model was established using extreme gradient boosting(XGBoost) with 5-fold cross-validation. The Shapley additive explanations(SHAP) method was used to visualize the radiomics model. A clinical model was constructed using univariate and multivariate logistic regression. The combined model comprising the radiomics signature and clinical factors was then established. This model’s performance was evaluated by discrimination, calibration, and clinical application. Generalization ability was evaluated by the testing cohort. Finally, the model was used to analyze overall and progression-free survival of different groups. Results: A third of the patients(81/243) were unsuitable for TACE treatment. The combined model had a high degree of accuracy as it identified TACE-unsuitable cases, at a sensitivity, specificity, and area under the receiver operating characteristic curve(AUC) of 0.759, 0.885, 0.906 [95% confidence interval(CI): 0.859-0.953] in the training cohort and 0.826, 0.776, and 0.894(95% CI: 0.815-0.972) in the testing cohort, respectively. Conclusions: The high degree of accuracy of our clinical-radiomics model makes it clinically useful in identifying intermediate-stage HCC patients who are unsuitable for TACE treatment.

关键词： Transarterial chemoembolization Hepatocellular carcinoma Radiomics Machine learning Prediction

PPy-Encapsulated Na_(2)Li_(2)Ti_(6)O_(14) Composites as High-Performance Anodes for Li-Ion Battery

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Acta Metallurgica Sinica(English Letters) 2022年第11期35卷 1873-1881页

作者： Fan-Fan Wang Nan Zhang Ze-Chen Lv Yan-Rong Zhu Jun-Hong Zhang ting-feng Yi School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Shandong Provincial Key Laboratory of Chemical Energy Storageand Novel Cell Technology Collegeof Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252059China School of Resources and Materials Northeastern University atQinhuangdaoQinhuangdao 066004China KeyLaboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004China

Na_(2)Li_(2)Ti_(6)O_(14) as a reliable anode material is becoming a hopeful candidate for Li-ion ***,the pristine Na_(2)Li_(2)Ti_(6)O_(14) usually suffer from bad rate performance and poor cycling stability under high current due to limited diffusion kinetics and poor electrical ***,the PPy-coated Na_(2)Li_(2)Ti_(6)O_(14) composites are successfully obtained via the solid-state method and followed by chemical oxidation process in the first *** results of tests prove that the Na_(2)Li_(2)Ti_(6)O_(14)@PPy composites have better electrochemical performance than the bare Na_(2)Li_(2)Ti_(6)O_(14) because of the excellent electrical conductivity and the special macromolecular architecture of *** particular,the Na_(2) Li_(2) Ti_(6) O_(14) @PPy(4 wt%)exhibits excellent charge capacities of about 223.2,218.0,200.8,184.3 and 172.6 mAh g^(-1) at 50,100,200,300 and500 mA g^(-1),respectively,revealing the best rate capability of all electrode *** Na_(2)Li_(2)Ti_(6)O_(14)@PPy(4 wt%)not only has the highest charge capacity under 0.5 mA g^(-1),but also has the highest capacity retention of 85.12%among all samples after 100 ***,the PPy coating is known as a promising way to improve the electrochemical property of Na_(2)Li_(2)Ti_(6)O_(14).The PPy-coated Na_(2)Li_(2)Ti_(6)O_(14) demonstrates the great prospect as promising negative materials for Li-ion batteries.

关键词： Li-ion battery Anode material Na_(2)Li_(2)Ti_(6)O_(14) PPy coating Electrochemical property

Tuning interface mechanism of FeCo alloy embedded N,S-codoped carbon substrate for rechargeable Zn-air battery

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Journal of Energy Chemistry 2024年第6期93卷 400-410,I0010页

作者： Hui Chang Lulu Zhao Shan Zhao Zong-Lin Liu Peng-Fei Wang Ying Xie ting-feng Yi School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina Key Laboratory of Functional Inorganic Material Chemistry Ministry of EducationSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080HeilongjiangChina Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province School of Resources and MaterialsNortheastern University at QinhuangdaoQinhuangdao 066004HebeiChina

The interface mechanism between catalyst and carbon substrate has been the focus of *** this paper,the FeCo alloy embedded N,S co-doped carbon substrate bifunctional catalyst(FeCo/S-NC)is obtained by a simple one-step pyrolysis *** experimental results and density functional theory(DFT)calculation show that the formation of FeCo alloy is conducive to promoting electron transfer,and the introduction of S atom can enhance the interaction between FeCo alloy and carbon substrate,thus inhibiting the migration and agglomeration of particles on the surface of carbon *** FeCo/SNC catalysts show outstanding performance for oxygen reduction reaction(ORR)and oxygen evolution reaction(OER).FeCo/S-NC shows a high half-wave potential(E_(1/2)=0.8823 V)for ORR and a low overpotential at 10 mA cm^(-2)(E_(j=10)=299 mV)for *** addition,compared with Pt/C+RuO_(2) assembled Zn-air battery(ZAB),the FeCo/S-NC assembled ZAB exhibits a larger power density(198.8 mW cm^(-2)),a higher specific capacity(786.1 mA h g_(zn)~(-1)),and ultra-stable cycle *** results confirm that the optimized composition and the interfacial interaction between catalyst and carbon substrate synergistically enhance the electrochemical performance.

关键词： FeCo alloy N S co-doped carbon DFT calculation Zn-air batteries Interfacial interaction

Understanding of the charge storage mechanism of MnO_(2)-based aqueous zinc-ion batteries:Reaction processes and regulation strategies

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Journal of Energy Chemistry 2023年第7期82卷 423-463,I0010页

作者： Nan Zhang Yu-Rui Ji Jian-Cang Wang Peng-Fei Wang Yan-Rong Zhu ting-feng Yi School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province School of Resources and MaterialsNortheastern University at QinhuangdaoQinhuangdao 066004HebeiChina

Though secondary aqueous Zn ion batteries(AZIBs)have been received broad concern in recent years,the development of suitable cathode materials of AZIBs is still a big *** MnO_(2) has been deemed as one of most hopeful cathode materials of AZIBs on account of some extraordinary merits,such as richly natural resources,low toxicity,high discharge potential,and large theoretical ***,the crystal structure diversity of MnO_(2) results in an obvious various of charge storage mechanisms,which can cause great differences in electrochemical ***,several challenges,including intrinsic poor conductivity,dissolution of manganese and sluggish ion transport dynamics should be conquered before real *** work focuses on the reaction mechanisms and recent progress of MnO_(2)-based materials of *** this review,a detailed review of the reaction mechanisms and optimal ways for enhancing electrochemical performance for MnO_(2)-based materials is *** last,a number of viewpoints on challenges,future development direction,and foreground of MnO_(2)-based materials of aqueous zinc ions batteries are put *** review clarifies reaction mechanism of MnO_(2)-based materials of AZIBs,and offers a new perspective for the future invention in MnO_(2)-based cathode materials,thus accelerate the extensive development and commercialization practice of aqueous zinc ions batteries.

关键词： Aqueous zinc-ion battery MnO_(2) Charge storage mechanism Optimization strategy

Construction of Na_(2)Li_(2)Ti_(6)O_(14)@LiAlO_(2)Composites as Anode Materials of Lithium-Ion Battery with High Performance

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Acta Metallurgica Sinica(English Letters) 2022年第12期35卷 2047-2056页

作者： Nan Zhang Ze-Chen Lv Yu-Shen Zhao Jun-Hong Zhang Yan-Rong Zhu ting-feng Yi School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology College of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252059China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China Key Laboratory of Dielectric Electrolyte Functional Material Hebei ProvinceQinhuangdao 066004China

In this work,we construct Na_(2)Li_(2)Ti_(6)O_(14)@LiAlO_(2)(NLTO-L)composites by a simple ball milled process and post-calcination in air atmosphere to improve the electrochemical *** thickness of the LiAlO_(2)coating layer is approximate2 *** morphology and particle size of Na_(2)Li_(2)Ti_(6)O_(14)are not dramatically altered after LiAlO_(2)*** samples display similar particles with a size range from 150 to 500 *** LiAlO_(2)coating can supply fast charge transmission paths with good insertion/extraction dynamics of lithium ions and provide an excellent rate performance and cycle performance of as-prepared Na_(2)Li_(2)Ti_(6)O_(14)@LiAlO_(2)***,LiAlO_(2)coating efficiently enhances the rate performance and cycle performance of Na_(2)Li_(2)Ti_(6)O_(14)anode,even at large current *** a result,Na_(2)Li_(2)Ti_(6)O_(14)@LiAlO_(2)(5 wt%)reveals remarkable rate properties with reversible charge capacity of 238.7,214.7,185.8,168.5 and 139.8 mAh g^(-1)at 50,100,200,300 and 500 mA g^(-1),***_(2)Li_(2)Ti_(6)O_(14)@LiAlO_(2)(5 wt%)also possesses a good cycle performance with a de-lithiation capacity of 166.5 mAh g-1 at 500 mA g^(-1)after 200 ***,the corresponding de-lithiation capacity of pure Na_(2)Li_(2)Ti_(6)O_(14)is only 140.1 mAh g^(-1).Consequently,LiAlO_(2)coating is efficeient approach to enhance the electrochemical performances of Na_(2)Li_(2)Ti_(6)O_(14).

关键词： Li-ion batteries Na_(2)Li_(2)Ti_(6)O_(14) LiAlO_(2) Anode material Electrochemical properties