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采煤机滚筒结构对装煤性能的影响

自动化应用 2024年第5期65卷 160-162页

作者：吕璐段延安陕西陕煤黄陵矿业有限公司一号煤矿陕西延安727307

针对采煤机滚筒截割硬煤、装煤效率低的问题,对设计的鼓形滚筒开展了装煤效率验证工作。仿真分析结果表明,截割相同质量的煤炭,鼓形滚筒的有效装煤效率优于普通滚筒。分析了锥顶角对鼓形滚筒有效装煤效率的影响。结果表明,随着筒毂锥顶... 详细信息

针对采煤机滚筒截割硬煤、装煤效率低的问题,对设计的鼓形滚筒开展了装煤效率验证工作。仿真分析结果表明,截割相同质量的煤炭,鼓形滚筒的有效装煤效率优于普通滚筒。分析了锥顶角对鼓形滚筒有效装煤效率的影响。结果表明,随着筒毂锥顶角的增大,有效装煤效率呈先增大后降低的趋势,锥顶角为10°的有效装煤效率最大,数值为72.3%。采用旋转截割试验台验证了鼓形滚筒仿真计算结果的准确性,证实了与普通滚筒相比,鼓形滚筒在装煤效率方面具有明显的技术优势。

关键词：煤矿采煤机滚筒结构装煤性能

生成式人工智能嵌入网络犯罪预警的机遇与挑战

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广西警察学院学报 2024年第3期37卷 117-128页

作者：吕露鹏刘松茂南京师范大学江苏南京210046 南京市玄武区人民检察院江苏南京210018

在网络犯罪治理中,用技术回应技术的事前预防远比事后惩戒更为重要。但随着网络犯罪手段的翻新,犯罪的时空信号特征愈发稀疏,使得基于大规模犯罪信号特征所构建的判别式人工智能在网络犯罪预警场景下捉襟见肘。生成式人工智能特有的上... 详细信息

在网络犯罪治理中,用技术回应技术的事前预防远比事后惩戒更为重要。但随着网络犯罪手段的翻新,犯罪的时空信号特征愈发稀疏,使得基于大规模犯罪信号特征所构建的判别式人工智能在网络犯罪预警场景下捉襟见肘。生成式人工智能特有的上下文理解能力和小样本学习能力,能够弥补当前网络犯罪预警系统对犯罪信号数据依赖的短板;自适应的多模态内容生成能力能够进一步增强事前预警的主动性,为网络犯罪预警带来新的机遇。然而,生成式人工智能对微调网络犯罪样本的高质量要求和算法黑箱下的决策结果偏信使得原有技术风险进一步深化。为充分释放生成式人工智能嵌入网络犯罪预警的技术红利,应在数据层面遵循安全与效率并举的合规理念,建设全生命周期的网络犯罪数据工程范式;在算法层面致力于重塑算法信任,增强技术的可解释性和决策结果稳定性,严格限制对潜在犯罪行为人的预警,并建立算法问责和补救机制。

关键词：网络犯罪预警生成式人工智能数据安全算法信任

Surface chemistry of polymer-supported nano-hydrated ferric oxide for arsenic removal: effect of host pore structure

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Science China Chemistry 2015年第4期58卷 722-730页

作者： Guangze Nie Jing Wang Bingcai Pan lu lv State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University

Immobilization of hydrous ferric oxide(HFO) particles inside solid hosts of porous structure is an important approach to improve their applicability in advanced water treatment such as arsenic and heavy metal removal. Here, we fabricated three polystyrene(PS)-based nano-HFOs and explored the effect of host pore structure on the surface chemistry of the immobilized HFOs. Potentiometric titration of the hybrids and surface complexation modeling of their adsorption towards arsenite and arsenate were performed to evaluate the surface chemistry variation of the loaded HFOs. Polymer hosts of higher surface area and narrower pore size would result in smaller particle size of HFOs and lower the value of the point of zero charge. Also, the site density(normalized by Fe mass) and the deprotonation constants of the loaded HFOs increased with the decreasing host pore size. Arsenite adsorption did not change the surface charge of the loaded HFOs, whereas arsenate adsorption accompanied more of the negative surface charges. Adsorption affinity of both arsenic species with three HFO hybrids were compared in terms of the intrinsic surface complexation constants optimized based on the adsorption edges. HFO loaded in polystyrene host of smaller pore size exhibits stronger affinity with arsenic species.

关键词： hydrated ferric oxide arsenic adsorption nanocomposite surface chemistry

Fabrication of hydrophobic Pd/Al_(2)O_(3)-phosphoric acid via P-O-Al bond for liquid hydrogenation reaction

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Chinese Journal of Chemical Engineering 2023年第1期53卷 232-242页

作者： lu lv Min Zhao Yanan Liu Yufei He Dianqing Li State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Beijing Engineering Center for Hierarchical Catalysts Beijing University of Chemical TechnologyBeijing 100029China

Alumina(Al_(2)O_(3))is widely used in the chemical industry as the catalyst and support due to its high specific surface area,abundant pore size distribution and chemical ***,the occurrence of hydration in water environment,result in outstanding decrease in specific surface area and collapse of pore *** this work,dodecyl phosphoric acid(PA)is used to modify the surface of Al_(2)O_(3)to obtain a series of hydrophobic material(Al_(2)O_(3)-PA).Based on XPS and NMR analysis,PA is chemically bonded on Al_(2)O_(3)to form PAOAAl ***,BET and WCA results display that Al_(2)O_(3)-1PA exhibits excellent the hydrophobicity and hydrothermal stability while maintains the pore *** it as the substrate to support the Pd nanoparticles,the as-prepared Pd/Al_(2)O_(3)-PA shows the superior catalytic performance in the hydrogenation of phenol and anthraquinone relative to Pd/Al_(2)O_(3),indicating the accessibility of Pd sites after PA ***,the significantly enhanced stability is also obtained in four cycles for aqueous phenol *** can be ascribed that the PA modification inhibits the aggregation of Pd nanoparticles and the products adhesion in the reaction *** extension of PA coatings to monolithic catalysts could expand their current capabilities in industrial applications and warrants ongoing investigation.

关键词： Alumina modification Hydrophobic catalyst Phenol hydrogenation Anthraquinone hydrogenation Accessible Pd sites

Secure NOMA and OMA coordinated transmission schemes in untrusted relay networks

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Science China(Information Sciences) 2021年第10期64卷 266-267页

作者： lu lv Zan LI Haiyang DING Jian CHEN State Key Laboratory of Integrated Services Networks Xidian University National Mobile Communications Research Laboratory Southeast University School of Information and Communications National University of Defense Technology

Dear editor,Safeguarding physical-layer non-orthogonal multiple access(NOMA) transmissions using relays has been received widespread attention [1, 2]. However, a relay may be datalevel untrusted and serve as an eavesdropper to decode its forwarded messages. Hence, information security needs to be guaranteed if an untrusted relay is involved.

关键词： Information Systems and Communication Service

Secure coordinated direct and untrusted relay transmissions via interference engineering

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Science China(Information Sciences) 2022年第8期65卷 213-227页

作者： lu lv Zan LI Haiyang DING Yuchen ZHOU Jian CHEN State Key Laboratory of Integrated Services Networks Xidian University National Mobile Communications Research Laboratory Southeast University School of Information and Communications National University of Defense Technology

This paper investigates the physical layer security issue of the coordinated direct and untrusted relay transmissions, considering both uplink and downlink scenarios. To effectively prevent the untrusted relay from eavesdropping on the confidential information it receives, two novel interference-assisted jamming schemes are proposed, where the inter-user interference and the artificial noise are intelligently engineered to degrade the signal reception quality at the untrusted relay, therefore enhancing the physical layer security for the uplink and downlink coordinated transmission, respectively. For each of the two proposed jamming schemes, a lower bound for the ergodic secrecy sum rate(ESSR) is derived in closed form to evaluate the secrecy performance. To obtain more system design insights, we further provide an asymptotic analysis for the ESSR scaling laws over the regimes of the high signal-to-noise ratio and a large number of antennas at the base-station. We carry out computer simulations to confirm the accuracy of the derived theoretical *** simulation results show that the proposed jamming schemes achieve a similar asymptotic performance limit to the case of using a trusted relay. Moreover, the proposed jamming schemes guarantee perfect security for both uplink and downlink coordinated transmissions, and yield a significant ESSR improvement compared with three other baseline schemes.

关键词： physical layer security untrusted relay interference exploitation coordinated transmission ergodic secrecy rate

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分选设备智能管控平台的研究与应用

煤炭加工与综合利用 2024年第8期 46-50页

作者：姜丽闽于涛吕璐璐梁琪峰卢嘉徐猛威海市海王旋流器有限公司山东威海264203

针对传统选矿行业存在的信息不透明、维护效率低下等问题,引入了物联网和数据分析等技术,设计并开发了一款智能管控平台,旨在提升分选设备的管理效率与作业质量。该平台通过部署传感器实时监测设备状态,结合云端数据分析,实现设备的智... 详细信息

针对传统选矿行业存在的信息不透明、维护效率低下等问题,引入了物联网和数据分析等技术,设计并开发了一款智能管控平台,旨在提升分选设备的管理效率与作业质量。该平台通过部署传感器实时监测设备状态,结合云端数据分析,实现设备的智能管理和维护。平台采用前后端分离架构,前端为Vue构建响应式界面,后端依托Java与Spring Boot框架开发,部署于云服务器,以确保高性能与扩展性。案例应用表明,智能管控平台在选矿行业具有显著的应用效果,为企业的安全生产和降本增效提供了重要支持。

关键词：分选设备智能管控平台人工智能大数据分析设备管理

Endoscopic Bariatric and Metabolic Therapies for Liver Disease:Mechanisms,Benefits,and Associated Risks

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Journal of Clinical and Translational Hepatology 2022年第5期10卷 986-994页

作者： Mengting Ren Xinxin Zhou lu lv Feng Ji Department of Gastroenterology The First Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiangChina

Nonalcoholic fatty liver disease(NAFLD),including advancedstage nonalcoholic steatohepatitis(NASH),is currently the most common chronic liver disease worldwide and is projected to become the leading indication for liver transplantation(LT).However,there are no effective pharmacological therapies for *** bariatric and metabolic therapies(EBMTs)are less invasive procedures for the treatment of obesity and its metabolic *** recent studies have demonstrated the beneficial effects of EBMTs on NAFLD/*** this review,we summarize the major EBMTs and their mechanisms of *** further discuss the current evidence on the efficacy and safety of EBMTs in people with NAFLD/NASH and obese cirrhotic LT *** potential utility of EBMTs in reducing liver volume and perioperative complications in bariatric surgery candidates is also ***,we review the development of liver abscesses as a common serious adverse event in duodenaljejunal bypass liner implantation.

关键词： Weight loss Endoscopy Obesity Nonalcoholic fatty liver disease Liver transplantation Liver abscess

Improvement in the Orthogonal Protein Degradation in Escherichia coli by Truncated mf-ssrA Tag

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Transactions of Tianjin University 2019年第4期25卷 357-363页

作者： lu lv Yang Wu Guozhen Zhao Hao Qi School of Chemical Engineering and Technology Tianjin University

SsrA peptide tag from Mycoplasma fl orum has been developed as a versatile biotechnology tool to control orthogonal degradation of tagged proteins in Escherichia coli . Here, using the systematic deletion mutants of mf -ssrA tag, we demonstrated that the residues in two separate regions have diff erent functions in mf -Lon-mediated specifi c orthogonal target protein degradation in E. coli . The deletion of multiple residues, up to six amino acids, did not fatally abolish its specifi c degradation activity, instead of being able to improve the stability of the tagged protein in the presence of endogenous proteases before mf -Lon expression in E. coli . Except for previously identifi ed essential residues, the region adjacent to the C-terminal of the mf -ssrA tag was involved in mf -Lon and endogenous protease-mediated degradation. Moreover, the deletion of specifi c residues made the mf -ssrA tag more eff ective and compact. The mf -ssrA tag can be implemented in synthetic biology and bioengineering for development of synthetic circuits.

关键词： mf -ssrA Protein degradation Escherichia coli L region R region