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Timing of the formation of the Baiyinnuo'er skarn Zn–Pb deposit,NE China:evidence from sulfide Rb–Sr dating

Acta Geochimica 2022年第2期41卷 185-196页

作者： Yixin Li Qihai Shu Xudong Niu Fan Yu Qingwen Zeng Liangmin Wei Yang Xiao Xianglin dai State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences and ResourcesChina University of GeosciencesBeijing 100083China Chifeng Hongling Nonferrous Mining Co.Ltd.(Shandong Gold Group) Chifeng 025420Inner MongoliaChina

The Baiyinnuo’er deposit in northern China is located in the south section of the Great Xing’an Range,and it is the largest skarn Zn–Pb deposit in the *** and Zn–Pb orebodies mainly occur between the different units of the Permian Huanggangliang Formation,or within the contact zone between the intrusive rocks and the *** Baiyinnuo’er has been well investigated previously,the timing of the Zn–Pb mineralization is still controversial,largely due to the lack of appropriate ore or alteration minerals that could be directly used for isotopic *** this study,we report the results of Rb–Sr isotopic analysis for sphalerite and pyrite samples from the Baiyinnuo’er orebodies,which yielded two isochron ages of 137.4±3.4 and 140.0±7.8 Ma,respectively,constraining the Zn–Pb mineralization time of the deposit as the Early *** data are also consistent with the age of the granitoids in the mining area,indicating a potential genetic relationship between the Early Cretaceous magmatism and *** other intrusion-related hydrothermal deposits(including the two typical skarns,Huanggang and Haobugao)in the southern Great Xing’an Range also share similar mineralization ages(i.e.,140–130 Ma).Together,these data suggest an Early Cretaceous mineralization event in this region,and this largescale mineralization could be related to the regional tectonic regime transition from compression to extension as a result of the rollback of the subducted Paleo-Pacific *** initial87 Sr/86 Sr ratios of the sphalerite and pyrite samples are 0.70569 and 0.70616,respectively,implying that the ore-forming material could have a significant contribution from the mantle *** current study shows that sulfide Rb–Sr dating could be used in deciphering the timing of skarn deposit formation.

关键词： Rb-Sr dating Sphalerite and pyrite Skarn Zn-Pb deposit Baiyinnuo’er Southern Great Xing’an Range

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Bioturbation of Thalassinoides from the Lower Cambrian Zhushadong Formation of Dengfeng area, Henan Province, North China

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Journal of Palaeogeography 2021年第1期10卷 39-54页

作者： Yu-Chao Fan Yong-An Qi Ming-Yue dai Da Li Bing-Chen Liu Guo-Shuai Qing School of Resources and Environment Henan Polytechnic UniversityJiaozuo 454000Henan ProvinceChina

Bioturbation plays a critical role in sediment mixing and biogeochemical cycling between sediment and *** abundance of bioturbation structures, dominated by Thalassinoides, occurs in carbonate rocks of the Cambrian Series 2 Zhushadong Formation in the Dengfeng area of western Henan Province, North China. Determination of elemental geochemistry can help to establish the influence of burrowing activities on sediment biogeochemical cycling, especially on changes in oxygen concentration and nutrient regeneration. Results show that there is a dramatic difference in the bioturbation intensity between the bioturbated limestone and laminated dolostone of the Zhushadong Formation in terms of productivity proxies(Baex, Cu, Ni, Sr/Ca) and redox proxies(V/Cr, V/Sc, Ni/Co). These changes may be related to the presence of Thalassinoides bioturbators, which alter the particle size and permeability of sediments, while also increase the oxygen concentration and capacity for nutrient *** with modern studies shows that the sediment mixing and reworking induced by Thalassinoides bioturbators significantly changed the primary physical and chemical characteristics of the Cambrian sediment,triggering the substrate revolution and promoting biogeochemical cycling between sediment and seawater.

关键词： Thalassinoides Sediment mixing Oxygen concentration Nutrient regeneration Trace element proxy Early Cambrian North China Platform

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The Nature of Bonding in PtC and PtN

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Chinese Chemical Letters 2001年第6期12卷 541-544页

作者： Xiao Guang XIE Xue Mei GAO Shi Xi LUI Huai CAO Shu Shan dai Department of Chemistry Yunnan University Kunming 650091 Modern Biological Center Yunnan University Kunming 650091

The nature of bonding in the title compounds has been studied by using CASSCF and FOCI techniques. The ground states of PtC and PtN are found to be (1)Sigma (+) and (2)Pi state arising primarily from:... 1 sigma (2)2 sigma (2)1 pi (4)1 delta (4)3 sigma (2) and...1 sigma (2)2 sigma (2)1 pi (4)1 delta (4)3 sigma (2)2 pi (1) configuration respectively and both of which form triple bond tone sigma, two pi bonds), but the bond of PtC is much stronger than that of PtN.

关键词： PtC and PtN nature of bonding molecular constants CASSCF FOCI

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不同程度帕金森病患者视盘参数及视网膜神经纤维层厚度定量分析

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中华眼底病杂志 2020年第1期36卷 15-19页

作者：赵颖戴惟葭刘大川首都医科大学宣武医院眼科北京100053

目的观察不同程度帕金森病(PD)患者视盘参数及视网膜神经纤维层(RNFL)厚度的变化。方法2016年10月至2017年10月于首都医科大学宣武医院神经内科检查确诊的原发性PD患者30例30只眼纳入研究。其中,轻中度、重度PD各为15例15只眼,并据此分... 详细信息

目的观察不同程度帕金森病(PD)患者视盘参数及视网膜神经纤维层(RNFL)厚度的变化。方法2016年10月至2017年10月于首都医科大学宣武医院神经内科检查确诊的原发性PD患者30例30只眼纳入研究。其中,轻中度、重度PD各为15例15只眼,并据此分组。选取同期健康志愿者20名20只眼作为正常对照组。采用傅里叶域OCT对所有受检眼视盘进行扫描。测量视盘面积、视杯面积、杯盘面积比、盘沿容积、视盘容积、视杯容积、盘沿面积、C/D面积、水平C/D、垂直C/D等参数;视盘平均以及上方、下方、颞侧上方(TU)、上方颞侧(ST)、上方鼻侧(SN)、鼻侧上方(NU)、鼻侧下方(NL)、下方鼻侧(IN)、下方颞侧(IT)、颞侧下方(TL)象限的RNFL厚度。3组受检眼视盘参数和RNFL厚度比较采用单因素方差分析;两两比较采用最小显著差法t检验。结果轻中度PD组、重度PD组、正常对照组受检眼视盘面积比较,差异无统计学意义(F=1.226,P>0.05);其余各项视盘参数比较,差异均有统计学意义(F=5.221、5.586、6.302、5.926、5.319、5.404、5.861、6.603,P0.05)。轻中度PD组、重度PD组受检眼平均RNFL以及TU、IN、IT、TL象限RNFL厚度均小于正常对照组;重度PD组受检眼平均以及TU、IN、IT、TL象限RNFL厚度均小于轻中度PD组,差异均有统计学意义(P<0.05)。其中,随着PD程度的加重,TL、TU象限RNFL变薄最为显著。结论PD患者视盘面积及容积缩小,视杯面积及容积扩大,C/D明显扩大;与正常对照组比较,平均RNFL厚度明显变薄,且以颞上、颞下方最为显著。

关键词：帕金森病视盘神经纤维体层摄影术光学相干

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Immune checkpoint molecules in natural killer cells as potential targets for cancer immunotherapy

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Signal Transduction and Targeted Therapy 2020年第1期5卷 340-358页

作者： Yuqing Cao Xiaoyu Wang Tianqiang Jin Yu Tian Chaoliu dai Crystal Widarma Rui Song Feng Xu Department of General Surgery Shengjing Hospital of China Medical University110004 ShenyangChina College of Life and Health Science Northeastern University110819 ShenyangChina Lawrence D.longo MD Center for Perinatal BiologyDepartment of Basic SciencesLoma Linda University School of MedicineLoma LindaCA 92350USA

Recent studies have demonstrated the potential of natural killer(NK)cells in immunotherapy to treat multiple types of *** cells are innate lymphoid cells that play essential roles in tumor surveillance and control that efficiently kill the tumor and do not require the major histocompatibility *** discovery of the NK’s potential as a promising therapeutic target for cancer is a relief to oncologists as they face the challenge of increased chemo-resistant *** cells show great potential against solid and hematologic tumors and have progressively shown promise as a therapeutic target for cancer *** effector role of these cells is reliant on the balance of inhibitory and activating *** the role of various immune checkpoint molecules in the exhaustion and impairment of NK cells when their inhibitory receptors are excessively expressed is particularly important in cancer immunotherapy studies and clinical *** immune checkpoint receptors and molecules have been found to mediate NK cell dysfunction in the tumor microenvironment;this has brought up the need to explore further additional NK cell-related immune checkpoints that may be exploited to enhance the immune response to refractory ***,this review will focus on the recent findings concerning the roles of immune checkpoint molecules and receptors in the regulation of NK cell function,as well as their potential application in tumor immunotherapy.

关键词： immunotherapy killer cancer

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A Comprehensive Survey on Trustworthy Graph Neural Networks:Privacy,Robustness,Fairness,and Explainability

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Machine Intelligence Research 2024年第6期21卷 1011-1061页

作者： Enyan dai Tianxiang Zhao Huaisheng Zhu Junjie Xu Zhimeng Guo Hui Liu Jiliang Tang Suhang Wang The Pennsylvania State University State College16801USA Michigan State University East Lansing48824USA

Graph neural networks(GNNs)have made rapid developments in the recent *** to their great ability in modeling graph-structured data,GNNs are vastly used in various applications,including high-stakes scenarios such as financial analysis,traffic predictions,and drug *** their great potential in benefiting humans in the real world,recent study shows that GNNs can leak private information,are vulnerable to adversarial attacks,can inherit and magnify societal bias from training data and lack inter-pretability,which have risk of causing unintentional harm to the users and *** example,existing works demonstrate that at-tackers can fool the GNNs to give the outcome they desire with unnoticeable perturbation on training *** trained on social networks may embed the discrimination in their decision process,strengthening the undesirable societal ***,trust-worthy GNNs in various aspects are emerging to prevent the harm from GNN models and increase the users'trust in *** this pa-per,we give a comprehensive survey of GNNs in the computational aspects of privacy,robustness,fairness,and *** each aspect,we give the taxonomy of the related methods and formulate the general frameworks for the multiple categories of trustworthy *** also discuss the future research directions of each aspect and connections between these aspects to help achieve trustworthi-ness.

关键词： Graph neural networks(GNNs) trustworthy privacy robustness fairness explainability

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[2]Pseudorotaxanes Based on Naphtho-21-crown-7 and Secondary Dialkylammonium Salts:Remarkably Improved Asso-ciation Constants Among Four Threaded Structures

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Chinese Journal of Chemistry 2014年第4期32卷 319-323页

作者： Qizhong Zhou Yan Luo Huajiang Jiang Yuyuan Ye Quan Zhang Guoliang dai Rener Chen Department of Chemistry Taizhou UniversityTaizhouZhejiang 318000China Department of Chemistry Zhejiang UniversityHangzhouZhejiang 310027China Department of Chemistry Fudan UniversityShanghai 200433China

This research article is focused on the recognition interaction of a new host naphtho-21-crown-7 and four sec-ondary dialkylammonium *** acetone,they can form 1∶1 host-guest complexes which belong to slow-exchange *** also found the differences of binding affinity and binding selectivity between the host and its complementary guest moieties,which could be ascribed to the aromaticπ-πstacking effect and the acidity increase of N-methylene and ammonium hydrogens due to the increasing electron withdrawing ability from butyl to methoxyphenyl to phenyl to p-cyanophenyl substituents in the recognition motif.

关键词： crown ethers host-guest systems pseudorotaxanes secondary ammonium salts

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Simulation and experiment of starting transient flow field of the hydrostatic bearing based on dynamic mesh method

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High Technology Letters 2017年第3期23卷 298-305页

作者：张艳芹 Kong Xiangbin Guo Lili Yu Xiaodong dai Chunxi Shao Junpeng College of Mechanical & Power Engineering Harbin University of Science and Technology Harbin 150080 P. R. China

A new method is developed to assess and analyze the dynamic performance of hydrostatic bearing oil film by using an amulets-layer dynamic mesh technique. It is implemented using C Language to compile the UDF program of a single oil film of the hydrostatic bearing. The effects of key lubrication parameters of the hydrostatic bearing are evaluated and analyzed under various working conditions,i.e. under no-load,a load of 40 t,a full load of 160 t,and the rotation speed of 1r/min,2r/min,4r/min,8r/min,16r/min,32r/min. The transient data of oil film bearing capacity under different load and rotation speed are acquired for a total of 18 working conditions during the oil film thickness changing. It allows the effective prediction of dynamic performance of large size hydrostatic bearing. Experiments on hydrostatic bearing oil film have been performed and the results were used to define the boundary conditions for the numerical simulations and validate the developed numerical model. The results showed that the oil film thickness became thinner with the increase of the operating time of the hydrostatic bearing,both the oil film rigidity and the oil cavity pressure increased significantly,and the increase of the bearing capacity was inversely proportional to the cube of the change of the film thickness. Meanwhile,the effect of the load condition on carrying capacity of large size static bearing was more important than the speed condition. The error between the simulation value and the experimental value was 4.25%.

关键词： hydrostatic bearing dynamic mesh transient data oil pad UDF

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Anisotropic metamaterial-assisted all-silicon polarizer with 415-nm bandwidth

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Photonics Research 2019年第12期7卷 1432-1439页

作者： HONGNAN XU DAOXIN dai YAOCHENG SHI Centre for Optical and Electromagnetic Research State Key Laboratory for Modern Optical Instrumentation Zhejiang UniversityZijingang Campus

Polarizers have been widely used in various optical systems to reduce polarization cross *** polarizers based on the silicon nanowire waveguide can provide chip-scale device size and a high polarization extinction ***,the working bandwidth for the on-chip silicon polarizers is always limited(20 d B)over a>415 nm bandwidth from1.26 to 1.675μm,which is at least fourfold better than what has been demonstrated in all previous *** the best of our knowledge,such a device is the first all-silicon polarizer that covers O-,E-,S-,C-,L-,and U-bands.

关键词： polarization waveguide polarizer

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SOME CHARACTERISTICS OF ECST WRITINGS

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外语教学 1982年第2期 15-20页

作者： dai Weihua

English is now established as the main international language of science and technology, and a growing number of scientists and technicians all over the world are obliged to read an increasing proportion of textbooks and articles writen in scientific English. Therefore, over the last ten years or so the term EST(English for Science and Technology) has appeared frequently in the literature relating to the teaching of English.

关键词： SOME CHARACTERISTICS OF ECST WRITINGS

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