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钕铁硼磁材多线切割机的设计与应用

机械研究与应用 2024年第3期37卷 101-104页

作者：于亚鹏宋政肽孙承政解培玉宫云庆于文文青岛高测科技股份有限公司山东青岛266114

文章根据3C消费电子行业对钕铁硼磁材的加工需求,设计制造了一台可以将钕铁硼磁材加工成片厚低于1 mm薄片的多线切割机。首先介绍多线切割机加工钕铁硼磁材的精度要求和多线切割机的整体设计方案,然后对其关键部件(包括进刀组件、主辊... 详细信息

文章根据3C消费电子行业对钕铁硼磁材的加工需求,设计制造了一台可以将钕铁硼磁材加工成片厚低于1 mm薄片的多线切割机。首先介绍多线切割机加工钕铁硼磁材的精度要求和多线切割机的整体设计方案,然后对其关键部件(包括进刀组件、主辊组件、排线组件等结构)与功能进行设计,最后对整机的工作原理与该多线切割机的优势进行介绍,为钕铁硼磁材切片领域的机床设计提供了参考。

关键词：钕铁硼磁性材料多线切割机金刚石线锯

成年打鼾人群患阻塞性睡眠呼吸暂停的危险因素分析

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中国口腔颌面外科杂志 2024年第2期22卷 137-142页

作者：郑彤姚侃钱轶峰孙红霞卢晓峰于雯雯上海交通大学医学院附属第九人民医院口腔颅颌面科上海交通大学口腔医学院国家口腔医学中心国家口腔疾病临床医学研究中心上海市口腔医学重点实验室上海200011

目的:探索成年打鼾人群罹患阻塞性睡眠呼吸暂停的相关危险因素,尝试性提出新型预测工具。方法:采用横断面研究,对2012年1月—2021年10月于上海交通大学医学院附属第九人民医院睡眠医学中心进行整夜多导睡眠监测(polysomnography,PSG)的... 详细信息

目的:探索成年打鼾人群罹患阻塞性睡眠呼吸暂停的相关危险因素,尝试性提出新型预测工具。方法:采用横断面研究,对2012年1月—2021年10月于上海交通大学医学院附属第九人民医院睡眠医学中心进行整夜多导睡眠监测(polysomnography,PSG)的成年打鼾人群进行数据收集,依据睡眠呼吸暂停低通气指数(apnea hyponea index,AHI)进行阻塞性睡眠呼吸暂停(obstructive sleep apnea,OSA)患病与否分组,分为非OSA组与OSA组,对成年打鼾人群OSA患病危险因素进行分析。结果:纳入研究对象1155例,整体OSA患病率为88.23%,患者男女比例为4.12∶1。成年打鼾人群罹患OSA的危险因素是年龄、颈围/身高比、性别、腰围,相应预警值为30.5岁、22.93、男性、86.25 cm。对于成年打鼾人群,提出OSA预测工具WRAG-N,预测OSA的AUC为0.789,灵敏度为87.2%,特异度为29.4%。结论:对于成年打鼾人群,30岁以上、男性、腰围大于86.25cm是OSA患病的危险因素,颈围/身高比是OSA患病与否的关键危险因素之一。作为罹患OSA的新型预测工具,WRAG-N有助于基层社区筛查成年打鼾高危人群,及时进行预防及诊治。

关键词：成人打鼾阻塞性睡眠呼吸暂停危险因素

Black hole evaporation and its remnants with the generalized uncertainty principle including a linear term

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Communications in Theoretical Physics 2024年第2期76卷 125-136页

作者： Bo yu Zheng-wen Long College of Physics Guizhou UniversityGuiyang550025China

In recent years,researchers have investigated the evaporation of Schwarzschild black holes using various forms of the generalized uncertainty principle(GUP),metric quantum correction,and noncommutative geometry,***,there are differences between the GUP correction and the other two methods in terms of describing the later stages of black hole ***,some studies argue that the GUP with a negative parameter cannot effectively correct black hole evaporation,while others contend that the positivity or negativity of the GUP parameters should not affect the correction *** the above into consideration,we reconsider black hole evaporation with the generalized uncertainty principle including a linear term(LGUP),and examine the case of negative *** results indicate that the evaporation behavior of both Schwarzschild black holes and Reissner–Nordstr?m black holes,under LGUP correction,is consistent with the results of metric quantum correction and non-commutative ***,the negative parameter LGUP can also effectively correct for black hole evaporation.

关键词： black hole evaporation generalized uncertainty principle negative parameter

Thermodynamic nature of black holes in coexistence region

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Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 27-32页

作者： Shao-wen Wei yu-Xiao Liu Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Provinceand Key Laboratory of Quantum Theory and Applications of Mo ELanzhou UniversityLanzhou 730000China Institute of Theoretical Physics&Research Center of Gravitation Lanzhou UniversityLanzhou 730000China

Studying the system state of coexistence regions will peek into to reveal microscopic interactions between different phases of a thermodynamic ***,there is no effective method to study thermodynamic nature of the coexistence black hole regions for the failure of the equation of *** at these coexistence states,in this work,we develop a general approach by introducing two new ratio *** first one is the ratio of the horizon radii of the saturated coexistence small and large black holes,and the second one measures that of the small black hole molecule number to the total molecule *** demonstrate that the first parameter can serve as an order parameter to characterize the first-order phase *** study also shows that the black hole state in the coexistence region is uniquely determined by these two introduced parameters bounded between 0 and *** results are quite significant in the analytical study of phase transition and the microscopic nature of black hole in the coexistence regions.

关键词： transition. state. thermodynamic

Effect of BaO and MgO on structure and properties of aluminate slag with various CaO/Al_(2)0_(3)ratios

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Journal of Iron and Steel Research International 2024年第1期31卷 204-214页

作者： yu-qi Kong Ting Wu wen-zhi Xia wen Yang Hai-chuan Wang School of Metallurgical Engineering Anhui University of TechnologyMa’anshan243032AnhuiChina Key Laboratory of Metallurgical Emission Reduction and Resource Recycling(Ministry of Education) Anhui University of TechnologyMa’anshan243002AnhuiChina

To provide theoretical guidance for performance stability control of low-reactive mold fluxes,the effects of BaO and MgO on the structure and properties of aluminate slag with various CaO/Al_(2)0_(3)(C/A)ratios were investigated using the Fourier transform infrared spectrometer,Raman spectroscope,hemispherical melting point instrument,rotational viscometer and X-ray *** results indicated that with BaO and MgO addition,the structure polymerization was first weakened and then enhanced at C/A of 1.1,and the transition contents corresponded to 8 wt.%BaO and 2 wt.%MgO,respectively,while the structure polymerization decreased continuously at C/A of *** the viscosity change was well consistent with the structure evolution,the polymerization degree played a more prominent role in the slag viscosity than superheat degree when the melting temperature difference was within 40℃.The break temperature decreased initially and then increased with augment of BaO and MgO at C/A of 1.1,while it manifested a decrease trend with BaO addition,and it decreased obviously but then turned to increase with MgO increment at C/A of *** crystallization phase and crystallization ratio kept stable with BaO increment,while the crystallization ratio rose greatly with MgO promoting LiAlO_(2)precipitation at C/A of *** crystal types of all experimental slags were mainly Ca_(12)Al_(14)O_(33)and CaF_(2)at C/A of 1.3,and the precipitation of crystalline phase BaAl2O4 demonstrated a rising trend,while that of Ca_(12)Al_(14)O_(33)gradually declined with BaO augment.

关键词： Aluminate slag Structure MgO BaO Viscosity Property

Equivalence between the internal observability and equation

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Applied Mathematics(A Journal of Chinese Universities) 2024年第1期39卷 89-97页

作者： LIU wen-jun TU Zhi-yu School of Mathematics and Statistics Nanjing University of Information Science and TechnologyNanjing 210044China

This paper is concerned with a third order in time linear Moore-Gibson-Thompson equation which describes the acoustic velocity potential in ultrasound wave *** by the work of Kaltenbacher,Lasiecka and Marchand(Control Cybernet.2011,40:971-988),we establish an observability inequality of the conservative problem,and then discuss the equivalence between the exponential stabilization of a dissipative system and the internal observational inequality of the corresponding conservative system.

关键词： Moore-Gibson-Thompson equation internal observability exponential stability

A Numerical Calculation Algorithm of the Inclination Function Based on the Representation of SO(3) Group

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Acta Mathematicae Applicatae Sinica 2024年第1期40卷 137-148页

作者： yu-xiao Wei wen-lin Tang Department of Geophysics School of Geology Engineering and GeomaticsChang’An UniversityXi’an710064China Key Laboratory of Electronics and Information Technology for Space Systems National Space Science CenterChinese Academy of SciencesBeijing100190China

In the determination of the Earth gravity field in satellite geodesy, the inclination functions represent the projection of data observed along the orbital plane of a satellite orbit into the sphere in the terrestial reference frame. The inclination functions in this work is studied from a group theoretical perspective. The inclination functions are proved to generate a representation of the SO(3) group. An orthogonal relation of the inclination functions is derived and some recurrence relations for the inclination functions are given, based on which an algorithm to calculate the inclination functions is proposed.

关键词： SO(3)group inclination function satellite geodesy representation of SO(3)

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长期使用质子泵抑制剂所致不良反应及机制

中国药物经济学 2024年第4期19卷 100-103,108页

作者：王丽于文雯柳克浩李敏郭瑞惠戚迎梅济南市药品不良反应和医疗器械不良事件监测中心济南250013

质子泵抑制剂(PPIs)通过作用于胃壁细胞上的H^(+)-K^(+)-ATP酶,抑制胃酸分泌,广泛用于治疗胃酸相关疾病等。长期使用PPIs所致药品不良反应(ADR)可累及多器官系统,相关临床表现为消化系统疾病(胃黏膜病变、肠道微生态紊乱)、泌尿系统疾病... 详细信息

质子泵抑制剂(PPIs)通过作用于胃壁细胞上的H^(+)-K^(+)-ATP酶,抑制胃酸分泌,广泛用于治疗胃酸相关疾病等。长期使用PPIs所致药品不良反应(ADR)可累及多器官系统,相关临床表现为消化系统疾病(胃黏膜病变、肠道微生态紊乱)、泌尿系统疾病(急性间质性肾炎、急性肾损伤)、代谢与营养类疾病(低镁血症、维生素B12缺乏、高尿酸血症)、肌肉骨骼疾病(骨质疏松与骨折)、内分泌系统疾病(糖尿病)、心血管疾病、神经系统疾病(痴呆)等,大部分ADR发生机制复杂多样。临床用药过程中应充分了解ADR发生特点和机制,警惕PPIs所致ADR,保证其用药安全合理。

关键词：质子泵抑制剂 H^(+)-K^(+)-ATP酶药品不良反应发生机制合理用药

BL03HB: a Laue microdiffraction beamline for both protein crystallography and materials science at SSRF

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Nuclear Science and Techniques 2024年第7期35卷 68-78页

作者： Zhi-Jun Wang Si-Sheng Wang Zheng-Huang Su Li yu yu-Zhu Wang Bo Sun wen wen Xing-yu Gao Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai201210China University of Chinese Academy of Science Beijing100049China

A Laue microdiffraction beamline(BL03HB) was constructed at the Shanghai Synchrotron Radiation Facility(SSRF).This beamline features two consecutive focusing points in two different sectors within its end station, the first dedicated to protein crystallography and the other tailored to materials science applications. Based on a superbend dipole magnet with a magnetic field of 2.29 T, a two-stage focusing design was implemented with two sets of Kirkpatrick-Baez mirrors to achieve a micro white beam as small as 4.2 μ m ×4.3 μ m at the first sector and 0.9 μ m ×1.3 μ m at the second sector in the standard beamline operation mode at SSRF. The X-ray microbeam in the two sectors can be easily switched between monochromatic and white beams by moving a four-bounce monochromator in or out of the light path, respectively. In the protein crystallography sector, white-beam Laue microdiffraction was demonstrated to successfully determine the structure of protein crystals from only a few images of diffraction data collected by a Pilatus 2 M area detector. In the materials science sector,the white-beam Laue diffraction was collected in a reflection geometry using another Pilatus 2 M area detector, which could map the microstructural distribution on the sample surface by scanning the samples. In general, the BL03HB beamline promotes the application of Laue microdiffraction in both protein crystallography and materials science. This paper presents a comprehensive overview of the BL03HB beamline, end station, and the first commission results.

关键词： Crystallography White-beam Laue microdiffraction Beamline Synchrotron