Nearly golden-ratio order in Ta metallic glass

The formation of mono-atomic tantalum(Ta)metallic glass(MG)through ultrafast liquid cooling is investigated by ab-initio molecular dynamics(MD)simulations.It is found that there exists nearly golden ratio order(NGRO)between the nearest and second nearest atoms in Ta MG,which has been indirectly confirmed by Khmich et al.and Liang et al..The NGRO is another universal structural feature in metallic glass besides the local five-fold symmetry(LFFS).Further analyzing of electronic structure shows that the obvious orientation of covalent bond could be attributed to the NGRO in amorphous Ta at 300 K.

Evaluation of the Golden Proportion in Patients Visiting the Oral Health Directorate of the Komfo Anokye Teaching Hospital, Kumasi

Background: Aesthetics is a primary consideration for patients seeking dental treatment. The size and shape of the maxillary anterior teeth have significant effects not only on the dental aesthetics, but also on the complete facial aesthetics of a person. To satisfy this expressed need, the “Golden Proportion” is a numerical value that is used as a rule in achieving dental aesthetics. In the last two decades, several studies have questioned the application of this rule in dentistry. Aim: The aim of this study is to evaluate the presence of “The Golden Proportion in the maxillary anterior teeth widths of clients visiting the Komfo Anokye Teaching Hospital’s (KATH) Oral Health Directorate, Kumasi”. Materials and methods: A total of 100 dentulous subjects comprised of 50 males and 50 females, with ages ranging between 18 and 37 years were chosen using convenience sampling. Their dental casts were evaluated for apparent width by digital calliper. Results: The results of the study were expressed in relation to gender and tooth laterality. The results revealed that the golden proportion existed in 14% and 20% for the left and right respectively between the central incisor and the lateral incisor for males, 12% and 16% respectively for the left and right sides of females, 8% and 20% for the left and right sides respectively for males between the lateral incisor and canine and 16% and 20% for the left and right respectively for females. Conclusion: Comparison of our results with the established golden value shows differences between 1.618 and from the range that was acquired from this study. The results suggest that the rule of the golden proportion should not be strictly applied when restoring anterior teeth of patients in the dental clinic.

Dental Precautions for the Golden Thread Lift Procedure

In cosmetic surgery, golden threads have been used in thread lift procedures, wherein golden threads are placed under the skin of the neck and chin. These are mainly applied in the maxillofacial region adjacent to the sites of dental treatment to achieve cosmetic benefits. However, as dentists typically lack sufficient knowledge about the golden thread lift procedure, it may present a challenge to dental examinations and treatments. It is therefore crucial for dentists to have a comprehensive understanding of the procedure. This case report covers our experience with the dental examination of a patient with golden threads. We emphasize the dental complications and precautions that should be taken for such cases. These golden threads are made of pure gold, nonabsorbable, and can be broken. These can obstruct dental examination, as well as cause metal allergies and foreign body granulomas. Additionally, it is difficult to completely remove these threads when they break apart. In the future, since more patients are expected to undergo this procedure, it is possible to encounter these golden threads as artifacts on imaging. Therefore, it is important to educate dentists about the golden thread lift procedure and its dental implications. It is also imperative to determine whether the patient has undergone the golden thread lift procedure in the medical questionnaire prior to the magnetic resonance imaging examination. Thus, dentists should be able to conduct a detailed interview with the patient, determine the feasibility of examination or treatment, and communicate this assessment to the patient.

Proportional Fairness-Based Energy-Efficient Power Allocation in Downlink MIMO-NOMA Systems with Statistical CSI

In this paper, proportional fairness(PF)-based energy-efficient power allocation is studied for multiple-input multiple-output(MIMO) non-orthogonal multiple access(NOMA) systems. In our schemes, statistical channel state information(CSI) is utilized for perfect CSI is impossible to achieve in practice. PF is used to balance the transmission efficiency and user fairness. Energy efficiency(EE) is formulated under basic data rate requirements and maximum transmitting power constraints. Due to the non-convex nature of EE, a two-step algorithm is proposed to obtain sub-optimal solution with a low complexity. Firstly, power allocation is determined by golden section search for fixed power. Secondly total transmitting power is determined by fractional programming method in the feasible regions. Compared to the performance of MIMO-NOMA without PF constraint, fairness is obtained at expense of decreasing of EE.

Hyperbolic Fibonacci and Lucas Functions, “Golden” Fibonacci Goniometry, Bodnar’s Geometry, and Hilbert’s Fourth Problem—Part III. An Original Solution of Hilbert’s Fourth Problem

This article refers to the “Mathematics of Harmony” by Alexey Stakhov [1], a new interdisciplinary direction of modern science. The main goal of the article is to describe two modern scientific discoveries—New Geometric Theory of Phyl-lotaxis (Bodnar’s Geometry) and Hilbert’s Fourth Problem based on the Hyperbolic Fibonacci and Lucas Functions and “Golden” Fibonacci -Goniometry ( is a given positive real number). Although these discoveries refer to different areas of science (mathematics and theoretical botany), however they are based on one and the same scien-tific ideas—The “golden mean,” which had been introduced by Euclid in his Elements, and its generalization—The “metallic means,” which have been studied recently by Argentinian mathematician Vera Spinadel. The article is a confirmation of interdisciplinary character of the “Mathematics of Harmony”, which originates from Euclid’s Elements.

Hyperbolic Fibonacci and Lucas Functions, “Golden” Fibonacci Goniometry, Bodnar’s Geometry, and Hilbert’s Fourth Problem—Part II. A New Geometric Theory of Phyllotaxis (Bodnar’s Geometry)

This article refers to the “Mathematics of Harmony” by Alexey Stakhov in 2009, a new interdisciplinary direction of modern science. The main goal of the article is to describe two modern scientific discoveries–New Geometric Theory of Phyllotaxis (Bodnar’s Geometry) and Hilbert’s Fourth Problem based on the Hyperbolic Fibonacci and Lucas Functions and “Golden” Fibonacci λ-Goniometry (λ > 0 is a given positive real number). Although these discoveries refer to different areas of science (mathematics and theoretical botany), however they are based on one and the same scientific ideas-the “golden mean,” which had been introduced by Euclid in his Elements, and its generalization—the “metallic means,” which have been studied recently by Argentinian mathematician Vera Spinadel. The article is a confirmation of interdisciplinary character of the “Mathematics of Harmony”, which originates from Euclid’s Elements.

Hyperbolic Fibonacci and Lucas Functions, “Golden” Fibonacci Goniometry, Bodnar’s Geometry, and Hilbert’s——Part I. Hyperbolic Fibonacci and Lucas Functions and “Golden” Fibonacci Goniometry

This article refers to the “Mathematics of Harmony” by Alexey Stakhov in 2009, a new interdisciplinary direction of modern science. The main goal of the article is to describe two modern scientific discove-ries—New Geometric Theory of Phyllotaxis (Bodnar’s Geometry) and Hilbert’s Fourth Problem based on the Hyperbolic Fibonacci and Lucas Functions and “Golden” Fibonacci λ-Goniometry ( λ > 0 is a given positive real number). Although these discoveries refer to different areas of science (mathematics and theoretical botany), however they are based on one and the same scientific ideas—the “golden mean”, which had been introduced by Euclid in his Elements, and its generalization—the “metallic means”, which have been studied recently by Argentinian mathematician Vera Spinadel. The article is a confirmation of interdisciplinary character of the “Mathematics of Harmony”, which originates from Euclid’s Elements.

流气式低本底α/β测量仪的串道特征及干扰修正

研究了一系列α、β金属平面源、粉末源及薄层样法自制面源在流气式低本底α/β测量仪上的串道现象。结果显示:^(90)Sr-^(90)Y金属面源以及 ^(14)C,^(137)Cs,^(90)Sr-^(90)Y, ^(40)K粉末源β对α通道的串道比均在0.1%以下,基本可以忽略不计;α金属平面源串道比大小规律表现为 ^(210)Po<^(209)Po<^(239)Pu<^(239)Pu-^(241)Am混合源<241Am,范围为3.49%~25.4%,发射不同能量粒子的α金属源的串道比差异较大。由于衰变过程产生的内转换电子、俄歇电子以及X射线等在β道产生响应,241Am源的串道比明显高于其他源,241Am粉末源的串道比随单位面积质量厚度增加而增大。α粒子对β通道的串道现象较明显,并与样品制源方式有关,主要是不同制源方式造成的自吸收差异导致的,总体有α粉末源串道比>薄层样法自制α面源>α金属平面源,测量时应重点考虑α粒子对β放射性的串道干扰。通过210Po加标样及牡蛎样品经放化分析制成的电镀源验证,对待测样品源进行一定厚度的铝箔或纸片覆盖,可以有效的减小α粒子对β通道的串道干扰;也可以直接利用串道比对测量计数进行修正,此时需要考虑待测样品源和串道比刻度源的一致性,否则会导致修正结果的偏差较大。

基于金豺优化PID的直流电机调速控制系统

针对传统直流(DC)有刷电机调速系统适应性不强、抗干扰能力和稳健性差等缺点,设计了基于金豺算法优化比例-积分-微分(PID)的直流有刷电机控制系统.在建立电机数学模型的基础上,将金豺优化(GJO)算法应用于PID参数整定,实现对电机的控制,并分别与传统试凑法、反向传播(BP)-PID算法和麻雀算法(SSA)-PID进行对比.仿真结果表明:所设计的控制算法在调节时间上减少了12 ms,超调量降低了3.689%,受到干扰后的调节时间减少了17 ms,表现出更快的调节转速、更强的抗干扰能力和更好的稳健性,为直流有刷电机调速控制提供了一种有效的方案.

“金水相生”视域下《金匮要略》中肺系疾病的辨治思路研究

《素问·咳论》中有云:“五脏六腑皆令人咳,非独肺也。”肺系疾病的发生与诸脏关系密切,虽调理诸脏可论治肺疾,然逐本溯源,肾为一身元阴元阳之根本,肺肾在五行中属金水相生,少阴肾水可滋阳明燥金,补子可令母实,补母亦可助子,两者互资互化,相得益彰。故而肺肾之间的关系不容小觑。《金匮要略》中从金水相生角度来论治肺系疾病虽仅有几个方证,却发挥着举足轻重的作用,其辨治思路为后世医家命门学说的形成奠定了基础,也为现今的临床诊疗予以启迪。现将《金匮要略》中从金水相生角度辨治肺系疾病之思路整合如下,以期裨益于临床肺系疾病的治疗。

基于改进麻雀搜索算法分数阶PI的PMSM调速策略

永磁同步电机调速系统采用传统比例积分双闭环控制结构存在抗扰性能差与响应速度慢的问题。为此,文中在建立PMSM数学模型和分析传统PI参数设计方法的基础上,提出一种基于改进麻雀搜索算法分数阶比例积分的PMSM调速优化策略,通过在常规SSA中引入佳点集初始化策略和黄金正弦更新策略,解决了SSA易陷入局部最优的问题,提高了收敛速度和精度,以进一步改善PMSM调速系统的响应性能。最后通过MATLAB仿真对比结果可知,所述ISSA-FOPI调速改进策略在4种工况下具有最短的调节时间分别为1.2、0.9、9.9与12.1 ms,和最小的超调量分别为0.16%、0.16%、0.05%与0.6%,这充分体现了所述策略的有效性与优越性。

黄金分割在产品外观设计中的应用研究

从历史上对黄金分割的应用以及重要性进行分析,并且着重介绍了黄金分割在产品外观设计中的应用,之后引出当今设计师们对于黄金分割的理解和关注,指出黄金分割对当前的产品设计具有重要的指导意义。

颗粒增强金属基复合材料的屈服行为

运用空间轴对称弹塑性有限元方法和混合律模型、给出了应力应变分配系数与复合材料的弹性模量、屈服强度以及切线模量之间的定量关系式、并由此提出了一种新的定义颗粒增强金属基复合材料比例极限和屈服行为的方法、进而研究了颗粒形状（球体 正圆柱体以及椭球体）和材料结构参数（颗粒体积分数和颗粒根间距）对颗粒增强金属基复合材料拉伸变形行为的影响．研究表明，通过研究应力应变分配系数及其二阶导数来确定复合材料屈服行为的方法不仅适用于短纤维增强金属基复合材料．而且也适用于颗粒增强金属基复合材料．该方法可以较好地反映出颗粒形状和材料结构参数对复合材料屈服行为的影响．

无铅仿金金属光泽釉的研制

以钾长石、高岭土、叶腊石、氧化锌、硅灰石、无铅玻璃粉为无铅基础釉原料,CuO、MnO2、TiO2、NiO为着色剂与析晶剂,采用单因素和正交实验方法,研制出-种无铅仿金金属光泽釉.主要考察了配方组成、工艺条件和烧成制度对仿金金属光泽釉的影响,并用X射线衍射分析（XRD）研究釉面产生仿金金属光泽的原因.结果表明：釉中的主晶相是CuMn2O4尖晶石,赋予釉面较好的仿金金属光泽效果;其最佳烧成范围为1180～1230℃,急冷保温温度为1100℃,缓冷保温温度为750℃,施釉厚度为0.3～0.5 mm.

非监督人脸美貌度评价

针对目前人脸美貌度评价方法计算复杂等不足,根据黄金比例的美学标准与人脸面部的三分之一比例,提出了一种基于图像的非监督人脸美貌度自动评价方法。基于人脸所具有的类Haar特征,定位人脸区域,提取人脸面部相关特征并确定其位置,结合人脸肤色的聚类性确定人脸边界。根据人脸面部各特征之间所具有的不同比例及其评分权重,通过计算所提取的人脸相关特征各比例与人脸美学人脸特征比例之间的差异度,对人脸美貌进行非监督自动评价。通过实验对比,验证了文中所提方法有效、可行。

有机无机肥配施比例对蔬菜产量和品质及土壤重金属含量的影响

关于蔬菜施有机肥和它与无机肥的合理配施比例,对蔬菜的产量和品质有重要影响,对土壤有机质和重金属含量也有影响。为控制施禽畜粪类有机肥对蔬菜的负面影响,探讨蔬菜的合理施用量和有机/无机肥配施比例,在不同质地的土壤上进行田间试验。结果表明,(1)施过量禽畜粪类有机肥对试验蔬菜产量和品质都会产生不良影响,小白菜(Brassica chinensis)和茄子(Eggplant)施禽畜粪超过22500kg/hm2、马铃薯(Solanum tuberosum L.)超过24000kg/hm2时,其产量不再增加,成活率下降,维生素C含量下降,多个试验均表现出有机肥用量增加而小白菜硝酸盐随之增加的典型特征;同时不论土壤的质地轻重,蔬菜重金属Pb有随禽畜粪用量增加而提高的趋势;在质地较轻的土壤上,蔬菜重金属Cd、As有随禽畜粪用量增加而提高的趋势;小白菜施禽畜粪肥超过7500kg/hm2、茄子和冬种马铃薯施禽畜粪肥超过75000kg/hm2,收获后土壤重金属含量高于对照和施无机肥的总Cr和As。(2)蔬菜单独施用有机肥的合适施用量,小白菜在较粘重的土壤上可施到22500kg/hm2,但有机肥与无机肥配合施用时有机肥用量可减量;茄子合适施用量应在22500kg/hm2左右;冬种马铃薯合适施用量应在24000kg/hm2左右。(3)蔬菜的有机/无机肥合理配比,小白菜、茄子、和冬种马铃薯施肥的有机氮与无机氮之比均为0.25∶1至0.5∶1时其产量和品质水平较佳。

焊接柔性加工单元中熔池的实时控制

机器人焊接过程中熔池实时控制系统是焊接柔性加工单元 (WFMC)中保证良好焊接质量的一个重要子系统。文中建立了WFMC中焊接质量实时控制子系统并实现了该子系统与WFMC中央监控计算机的实时可靠通讯。在获得了焊接熔池特征参数的基础上 ,建立了焊接过程熔池正面参数和焊缝背面参数的神经网络模型。模型根据熔池正面参数可实时预测焊缝背面宽度。并设计了神经元自学习比例求和微分(PSD)控制器 ,通过调整脉冲峰值电流 ,实现了机器人脉冲钨极气体保护焊 (GTAW )过程中通过正面熔池传感对焊接焊缝背面宽度的实时控制。

节水灌区指标体系与总效益评价方法探讨研究

随着节水灌区建设规模日益增大,针对节水灌区的评价指标和评价效益的方法研究也在进一步深入。本文所介绍的方法是对灌区监测得到的信息及人为调查得来的信息进行综合分析研究,结合专家群决策以及AHP方法来确定权重系数,从而通过计算可得到评价指标和评价效益相对应的评价数据,进而确定节水灌区建设及效益的满意程度。通过实例进行计算分析,得到较为满意的结果,可为灌区的策略性发展建设提供依据。

短纤维增强金属基复合材料拉伸变形的屈服行为的理论研究

运用空间轴对称弹塑性有限元方法和混合律模型，推导出应力应变分配系数的解析表达式，并由此提出了一种新的定义复合材料比例极限和屈服强度的方法，进而研究了材料参数（纤维长径比、纤维体积分数、纤维根间距和基体应变硬化指数）对短纤维金属基复合材料拉伸变形行为的影响．研究表明，应力应变分配系数及其变化速率可以定量描述复合材料的屈服行为及应力分配作用；低应变阶段的应力应变分配系数与复合材料弹性模量之间存在确定的关系．该方法可以反映出材料参数对复合材料屈服行为的影响，预测的弹性模量和屈服强度与实验结果及Ｅｓｈｅｌｂｙ模型吻合很好。

基于CMOS摄像头的智能车控制系统设计及实现

针对智能车因单条引导线信息量少而引起的误识别问题,设计一种能自动识别和跟踪双边引导线的智能车系统。智能车以Freescale公司MC9S12XSl28作为核心控制器,利用COMS(Complementary Metal OxideSemiconductor)摄像头OV7620作为路径信息采集装置,对采集图像进行二值化处理、去噪操作和边缘检测后提取路径信息、进而准确地判别跑道的形状,为舵机和电机提供控制依据,以使小车平稳快速地行驶。同时,提出将行驶状态与赛道信息综合考虑的措施,并通过PID(Proportional Integral Differential)控制策略以及实验测试,实现了对各种典型跑道的优化处理,使高速行进中的智能车具有良好的转向调节能力和加减速响应能力。智能车可以在以白色为底面颜色,两边有黑色引导线的跑道上运行,克服了因单条引导线信息量少而引起的误识别问题。