ThyroidNet:A Deep Learning Network for Localization and Classification of Thyroid Nodules

Aim:This study aims to establish an artificial intelligence model,ThyroidNet,to diagnose thyroid nodules using deep learning techniques accurately.Methods:A novel method,ThyroidNet,is introduced and evaluated based on deep learning for the localization and classification of thyroid nodules.First,we propose the multitask TransUnet,which combines the TransUnet encoder and decoder with multitask learning.Second,we propose the DualLoss function,tailored to the thyroid nodule localization and classification tasks.It balances the learning of the localization and classification tasks to help improve the model’s generalization ability.Third,we introduce strategies for augmenting the data.Finally,we submit a novel deep learning model,ThyroidNet,to accurately detect thyroid nodules.Results:ThyroidNet was evaluated on private datasets and was comparable to other existing methods,including U-Net and TransUnet.Experimental results show that ThyroidNet outperformed these methods in localizing and classifying thyroid nodules.It achieved improved accuracy of 3.9%and 1.5%,respectively.Conclusion:ThyroidNet significantly improves the clinical diagnosis of thyroid nodules and supports medical image analysis tasks.Future research directions include optimization of the model structure,expansion of the dataset size,reduction of computational complexity and memory requirements,and exploration of additional applications of ThyroidNet in medical image analysis.

Localization effect in single crystal of RuAs_(2)

We report the magnetotransport and thermal properties of RuAs_(2) single crystal.RuAs_(2) exhibits semiconductor behavior and localization effect.The crossover from normal state to diffusive transport in the weak localization(WL)state and then to variable range hopping(VRH)transport in the strong localization state has been observed.The transitions can be reflected in the measurement of resistivity and Seebeck coefficient.Negative magnetoresistance(NMR)emerges with the appearance of localization effect and is gradually suppressed in high magnetic field.The temperature dependent phase coherence length extracted from the fittings of NMR also indicates the transition from WL to VRH.The measurement of Hall effect reveals an anomaly of temperature dependent carrier concentration caused by localization effect.Our findings show that RuAs_(2) is a suitable platform to study the localized state.

柔性无轨AGV在光伏工程中的应用

阐述AGV具有适应性好、柔性程度高、可靠性好、可实现生产和搬运功能的集成化和自动化的优点,广泛应用于数字化制造系统中。探讨以AGV小车在光伏工程中的传统技术为基础,扩展AGV小车的功能,结合激光SLAM和系统信息化技术,设计一款柔性无轨AGV和配套系统。经过测试和项目实际验证,柔性无轨AGV和配套系统可在光伏工程中得到应用。

OPN5-TSH-DIO2/DIO3和VIP-PRL在短光照抑制公山麻鸭睾丸活性中的表达规律

旨在探究短光照抑制公山麻鸭繁殖机能的过程中,OPN5-TSH-DIO2/DIO3通路和VIP-PRL通路主要相关因子表达规律及可能存在的相互关系。本试验选取80只正常繁殖期(220日龄)、体重相近且健康的山麻鸭公鸭作为研究对象,试验前15 d维持正常繁殖期的长光照(18L∶6D),从d16开始每天缩短光照2 h,到每天光照时间为8 h(8L∶16D)后持续至试验结束(d45);于d15、d21、d30、d45采集血液样本和下丘脑、垂体、睾丸等组织样,通过HE染色、ELISA、qRT-PCR、Western blot技术检测睾丸发育情况及下丘脑、垂体、睾丸中相关基因和蛋白表达水平。结果显示,与长光照条件相比,短光照导致公鸭睾丸萎缩,生精细胞和精子数量显著减少(P<0.05);血液LH、PRL、睾酮水平均显著降低(P<0.05);下丘脑GnRH表达下降,GnIH表达上升,但差异均不显著(P>0.05);垂体GnIHR呈上升趋势,FSH呈下降趋势,但均无显著差异(P>0.05),GnRHR试验后期明显上升(P<0.05),LH无明显变化趋势;睾丸中FSHR、LHR的基因表达均下降,但无显著差异(P>0.05)。在OPN5-TSH-DIO2/DIO3通路中,OPN 5基因和蛋白表达水平显著降低(P<0.05),DIO2、TSH-β基因表达水平显著降低(P<0.05),DIO2蛋白水平降低(P>0.05),DIO3基因表达趋势则与DIO 2相反,缩短光照导致基因表达水平上升(P>0.05),DIO3蛋白水平显著上升(P<0.05);VIP-PRL通路中,下丘脑VIP和垂体PRL的基因表达均显著下降(P<0.05),垂体PRLR的基因表达显著上升(P<0.05),睾丸PRLR的基因表达显著下降(P<0.05)。结果表明,在短光照抑制公山麻鸭繁殖性能的过程中,OPN5-TSH-DIO2/DIO3通路和VIP-PRL通路均参与其中,介导了短光照对生殖轴的抑制作用;与正常繁殖期所需光照条件相比,短光照均会抑制两通路的效率,从而实现对生殖轴活性的下调,但其中两通路间的相互调控关系仍有待进一步研究。

Electronic Structure of the Weak Topological Insulator Candidate Zintl Ba_(3)Cd_(2)Sb_(4)

One of the greatest triumph of condensed matter physics in the past ten years is the classification of materials by the principle of topology.The existence of topological protected dissipationless surface state makes topological insulators great potential for applications and hotly studied.However,compared with the prosperity of strong topological insulators,theoretical predicted candidate materials and experimental confirmation of weak topological insulators(WTIs) are both extremely rare.By combining systematic first-principles calculation and angle-resolved photoemission spectroscopy measurements,we have studied the electronic structure of the dark surface of the WTI candidate Zintl Ba_(3)Cd_(2)Sb_(4)and another related material Ba_(3)Cd_(2)As_(4).The existence of two Dirac surface states on specific side surfaces predicted by theoretical calculations and the observed two band inversions in the Brillouin zone give strong evidence to prove that the Ba_(3)Cd_(2)Sb_(4)is a WTI.The spectroscopic characterization of this Zintl Ba_(3)Cd_(2)N_(4)(N = As and Sb) family materials will facilitate applications of their novel topological properties.

嵌入式铝/钢冷轧复合带材铝层的厚度波动形成机理与控制（英文）

研究压下率和铝带初始厚度对冷轧复合嵌入式铝/钢复合带材铝层厚度波动的影响,分析铝层厚度波动的形成机理,提出改善复合带材铝层厚度均匀性的措施。结果表明,随着压下率的增加,铝层厚度波动逐渐增大。当压下率低于40%时,初始铝带厚度对复合带材铝层厚度波动量的影响较小;当压下率高于40%时,随初始铝带厚度的减小,复合带材的厚度波动量增大。表面处理形成的钢带表面硬化层引起钢带表层变形和钢/铝界面结合程度不均匀是导致复合带材铝层厚度波动的主要原因。采用合适的钢带表面处理方式降低钢带表面硬化程度,改善钢带表层变形和钢/铝界面结合程度的均匀性,可有效降低铝/钢复合带材的铝层厚度波动。

碳化硅工艺炉过温保护系统设计与研究

半导体材料加工的过程中,温度作为非常重要的因素将直接影响工艺质量及设备的稳定性与安全性。半导体工艺设备为防止超温,设计了过温保护系统。通过详述过温保护系统的工作原理、核心线路、控制回路与产品验证的相关过程,证明该过温保护系统性能良好,能安全、稳定、高效的运行。

碳酸丙烯酯改性2-甲基咪唑固化剂的制备与应用

利用碳酸丙烯酯(PC)与2-甲基咪唑(2-MI)进行羟烷基化取代反应,合成了碳酸丙烯酯改性2-甲基咪唑(PC-MI)固化剂。将所合成的PC-MI固化剂与E-44环氧树脂配制成胶黏剂,通过胶料的硬化时间、凝胶时间、拉伸性能测试,考察了改性固化剂的合成工艺和使用工艺条件对PC-MI胶黏剂性能的影响。结果表明,PC-MI固化剂的优化合成工艺条件为,PC与2-MI按摩尔比2:1在135℃反应4 h,其合适用量为E-44环氧树脂质量的12%;由此得到的环氧胶料室温凝胶时间为96 h,在140℃固化3 h后,拉伸剪切强度、断裂伸长率分别达到31.58 MPa,5.08%。相较于2-MI,PCMI固化剂与环氧树脂更易混溶,所配胶料室温凝胶时间得到有效延长,拉伸剪切性能优良。

水滑石与海泡石复合材料对有机染料的光催化降解性能（英文）

由于ZnCr-LDH纳米粒子具有良好的光催化性能,但极易团聚,在一定程度上制约了它在光催化领域的应用.将水滑石制成核-壳复合材料可以避免粒子团聚,改善其单分散性和稳定性,从而提高光催化活性.本文设计了一种水滑石/海泡石(Sep@LDH)纳米复合材料作为光催化剂,以甲基橙(MO)和亚甲基蓝(MB)混合溶液模拟有机染料废水,进行光催化反应.通过XRD,SEM,UV-Vis DRS,PL,TG-DTG和BET/BJH,证明了水滑石成功的生长在海泡石的表面,通过光催化实验详细研究了Sep@LDH纳米复合材料的光催化性能及光降解反应机理.采用共沉淀制备了不同Zn/Cr摩尔比的水滑石纳米材料,对水滑石进行优化,结合表征分析,发现摩尔比为1的ZnCr-LDH其结晶度、层间规整度高,禁带宽度最窄(2.30 eV)和光致发光性能最佳.因而用作后续复合材料的制备.另一方面,我们以酸活化的海泡石(Sep)为载体,采用原位生长法成功制备了一种新型的水滑石/海泡石(Sep@LDH)光催化剂,研究了海泡石的添加量对复合材料性能的影响.结果表明,Sep含量对复合材料形貌、粒径大小、结构以及光学性质影响较大.其中,样品Sep_4@LDH(海泡石添加量为4 g),比表面积最大,因而光催化效率最高.降解动力学结果表明,染料的光降解过程遵循准一级动力学模型.我们通过对活性物种(·OH,h^+,·O_2^-)的考察,研究了光催化降解机理.结果表明,·OH在光降解过程中起着至关重要的作用.Sep_4@LDH复合材料循环使用5次后,MO和MB的光降解率依然分别可以达到86.2%和84.9%,表现出较高的稳定性.

Siva-1在胃癌组织中的表达及其临床意义

目的探讨Siva-1在胃癌组织中的表达及其与细胞凋亡的关系。方法选取2016年1月—2018年12月广西壮族自治区人民医院经手术切除的胃癌组织及癌旁组织各54例。采用qRT-PCR和SP法检测Siva-1mRNA及蛋白的表达水平,分析Siva-1在胃癌组织中的表达及与临床病理特征的关系。结果胃癌组织中Siva-1阳性表达率较低(P <0.05),Siva-1 m RNA相对表达量较低(P <0.05)。不同肿瘤直径、肿瘤分期患者Siva-1阳性表达率比较,差异有统计学意义(P <0.05)。经Pearson相关性分析,Siva-1 mRNA表达量与肿瘤直径呈负相关(r=-0.376,P <0.05)。结论 Siva-1在胃癌组织中低表达,且与肿瘤的发生、发展有关,可作为诊断胃癌的潜在标志物。

The production of biobased diamines from renewable carbon sources: Current advances and perspectives

Bio-based diamines are considered to be a promising alternative to traditional fossil-fuel-based diamines,the important platform chemical for the synthesis of polymer materials.In this review,the current status of the art of the synthesis of aliphatic and aromatic diamines from renewable biomass are considered.In the case of aliphatic diamines,we describe strategies for biologically producing diamines with different carbon numbers including 1,3-diaminopropane,1,4-butanediamine,1,5-pentanediamine,1,6-diaminohexane,1,8-diaminooctane,1,10-diaminodecane,and 1,12-diaminododecane.In addition,aromatic diamines produced from various kinds of renewable biomass,including lignin,cashew nut shell,and terpenoids,are reviewed here.Furthermore,the application of typical diamines in synthesis of polyurethane and polyamide are also reviewed.

高韧性尼龙6-聚氧化乙烯醚复合材料制备及复合形式对合成及结构性能影响

分别通过物理分散和化学嵌段形式将柔性端氨基聚氧化乙烯醚(PEA)引入尼龙6(PA6)体系制备了PA6/PEA共混物和PA6-b-PEA共聚物。研究发现,PEA的引入使得聚合反应活性降低,活化能增大,共聚体系中PEA-TDI大分子引发剂的长链效应和位阻效应对聚合反应的延缓作用更明显。当复合材料中PEA含量相同时,共混体系的结晶性能优于共聚体系,而当嵌段的PEA含量较高时,共聚体系形成少量γ晶。随PEA含量增加,PA6-PEA复合材料的弹性平台和应变硬化现象愈加明显。嵌段的柔性PEA链段使共聚分子链排列不再规整,分子链运动能力大幅提升,从而使PA6-b-PEA共聚物具有高抗冲击性,其冲击断面产生大形变和"毛发"结构,呈现韧性断裂特征。

Behavior of rare earth elements in granitic profiles, eastern Tibetan Plateau, China

Rare earth elements(REEs) can record geologic and geochemical processes. We studied two granitic regolith profiles from different climatic zones in eastern Tibetan Plateau and found that(1)∑ RREEs ranged from119.65 to 275.33 mg/kg in profile ND and5.11–474.55 mg/kg in profile GTC, with average values of205.79 and 161 mg/kg, respectively. ∑RREEs was higher in accumulation horizon and semi-regolith;(2) Influenced by climate, the fractionation of light and heavy REEs(LREEs and HREEs) varied during weathering. The ratio of LREEs/HREEs in pedosphere was higher than semi-regolith in tropical profile;(3) A negative Eu anomaly in both profiles was the result of bedrock weathering. A positive Ce anomaly was observed in all layers of profile ND, and only in the upper 100 cm of profile GTC. This indicates that redox conditions along the regolith profile varied considerably with climate.(4) Normalized by chondrite,LREEs accumulated much more than HREEs; REE distribution curves were right-leaning with a V-type Eu anomaly in both profiles.

Sandwiched N-carbon@Co_(9)S_(8)@Graphene nanosheets as high capacity anode for both half and full lithium-ion batteries

Transition metal sulfides(TMSs) are promising candidates for replacing graphite anode in LIBs. However,the low conductivity and structural collapse caused by the large volume change during lithium insertion and extraction greatly limit its application. Herein, we report a unique design of a two-dimensional(2 D) sandwich structure of N-doped carbon@Co9 S8@graphene(N–C@Co9 S8@G) with multilayer structure. Electrochemical tests reveal that the N–C@Co9 S8@G nanosheets possess a high reversible capacity(1009 mAhg^(-1) at 0.1 Ag^(-1)), and excellent rate capability(422mAhg^(-1) at 10 Ag^(-1)) and long cycle life(853 m Ahg^(-1) at 1Ag^(-1) for 500 cycles). Experimental studies reveal that capacitive storage contributes to the high reversible capacity. The lithium storage kinetics are studied by Galvanostatic intermittent titration technique(GITT) and electrochemical impedance spectroscopy(EIS). Meanwhile, the potential of N–C@Co9 S8@G anode in a full cell using Li Co O2 as the cathode is also demonstrated, exhibiting a high reversible capacity of 300mAhg^(-1) cycles at 0.1Ag^(-1). The strategy proposed in this work paves the way to engineering high performance anodes in LIBs.

Multi-bubble motion behavior of electric field based on phase field model

By coupling the phase field model with the continuity equation of incompressible fluid, Navier–Stokes equation,electric field equation, and other governing equations, a multi-field coupling model for multi-bubble coalescence in a viscous fluids is established. The phase field method is used to capture the two-phase interface. The motion and coalescence of a pair of coaxial bubbles under an external uniform electric field and the effects of different electric field strengths on the interaction and coalescence of rising bubbles are studied. The results show that the uniform electric field accelerates the collision and coalescence process of double bubbles in the fluid, and increases the rising velocity of the coalesced bubble.The electric field with an intensity of E = 2 kV/mm is reduced about 2 times compared with that without electric field in coalescence time. When the electric field strength is strong(E ≥ 1 kV/mm), the coalesced bubble will rupture before it rises to the top of the calculation area, and the time of the bubble rupturing also decreases with the increase of the electric field strength. The phase field method is compared with the simulation results of Lattice Boltzmann Method(LBM), and the shape of bubble obtained by the two methods is in good agreement, which verifies the correctness of the calculation model.

Effects of ferrites on magnetic transport properties in La_(2/3)Sr_(1/3)MnO_3/ferrites composites

Effects of soft-magnetic MnZn ferrite （Mn0.5Zn0.5Fe2O4, MZF） and hard-magnetic Ba ferrite （BaO.6Fe2O3, BaM） on the structure and magnetic transport properties of [La2/3Srl/3MnO3] （LSMO）/（x） [ferrites] （ferrites=MZF, BaM） composites have been investigated. It was found that the inclusion of MZF phase reduces magnetization and ferromagnetic-paramagnetic transition temperature （To） of the composites. With increasing the content of the dopants, the high-temperature magnetoresistance （MR） decreases, whereas low-temperature MR increases and reaches 42% at 150 K and x=0.1. However, for the LSMO/BaM composites, magnetization and ferromagneticparamagnetic transition temperature （To） decrease firstly as x〈5%, and then increase as x〉5%. The resistivity of the composites increases by five orders of magnitude at x=1% and is out of measured range at x=5%. High magnetic field has little effect on the resistivity and magnetoresistance originate from the pinning effect of BaM for the composites with x〉5%, which may grains.

恩替卡韦治疗乙型肝炎病毒耐药的效果

目的分析恩替卡韦治疗乙型肝炎病毒耐药导致慢性重型肝炎的效果。方法纳入本院自2017年2月—2019年2月期间接收的68例乙型肝炎患者作为研究对象,以硬币投掷法为基准,分为治疗组和对照组,对照组予以常规治疗,治疗组予以恩替卡韦治疗,对68例患者治疗效果、肝功能指标以及转阴率进行评估。结果治疗组治疗效果优于对照组(P<0.05)。治疗组肝功能指标优于对照组(P<0.05)。治疗组转阴率高于对照组(P<0.05)。结论对乙型肝炎患者采用恩替卡韦治疗,既能提高治疗效果,又能改善患者肝功能指标,提高转阴率。

基于认知学习观的跨文化交际能力培养

跨文化交际能力已成为当今大学英语教学的主要目标之一。以认知学习观为理论参照,分析跨文化交际的教学意义和研究现状,探讨跨文化交际教学的具体内容和模式,在认知领域对跨文化交际能力的培养研究作出新的阐释。

Duodenal ulcer caused by coil wiggle after digital subtraction angiography-guided embolization: A case report

BACKGROUND Acute gastrointestinal bleeding(GIB)is a life-threatening medical emergency with high morbidity and mortality.Transcatheter embolization with endovascular coils under digital subtraction angiography guidance is a common and effective method for the treatment of GIB with high technical success rates.Duodenal ulcers caused by coils wiggled from the branch of the gastroduodenal artery,which is a rare complication,have not previously been reported in a patient with right intrathoracic stomach.CASE SUMMARY A 62-year-old man had undergone thoracoscopy-assisted radical resection of esophageal cancer and gastroesophageal anastomosis 3 years ago,resulting in right intrathoracic stomach.He was admitted to the hospital 15 mo ago for dizziness and suffered acute GIB during his stay.Interventional surgery was urgently performed to embolize the branch of the gastroduodenal artery with endovascular coils.After 15 mo,the patient was re-admitted with a chief complaint of melena for 2 d,esophagogastroduodenoscopy and abdominal computed tomography revealed that some endovascular coils had migrated into the duodenal bulb,leading to a deep ulcer.Bleeding was controlled after conservative treatment.Seven months later,duodenal balloon dilatation was performed to relieve the stenosis after the removal of a few coils,and the patient was safely discharged with only one coil retained in the duodenum due to difficulties in complete removal and risk of bleeding.Mild melena recurred once during the long-term follow-up.CONCLUSION Although rare,coil wiggle after interventional therapy requires careful attention,effective precautionary measures,and more secure alternative treatment methods.

Tip-induced superconductivity commonly existing in the family of transition-metal dipnictides MPn_(2)

We report the tip-induced superconductivity on the topological semimetal NbSb_(2), similar to the observation on TaAs_(2) and NbAs_(2). Belonging to the same family of MPn_(2), all these materials possess similar band structures, indicating that the tip-induced superconductivity may be closely related to their topological nature and share a common mechanism. Further analysis suggests that a bulk band should play the dominant role in such local superconductivity most likely through interface coupling. In addition, the compatibility between the induced superconductivity and tips’ ferromagnetism gives an evidence for its unconventional nature. These results provide further clues to elucidate the mechanism of the tip-induced superconductivity observed in topological materials.