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Spatial variation law of vertical derivative zero points for potential field data 被引量:9
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作者 王万银 张功成 梁建设 《Applied Geophysics》 SCIE CSCD 2010年第3期197-209,292,共14页
In this paper we deduce the analytic solutions of the first- and second-order vertical derivative zero points for gravity anomalies in simple regular models with single, double, and multiple edges and analyze their sp... In this paper we deduce the analytic solutions of the first- and second-order vertical derivative zero points for gravity anomalies in simple regular models with single, double, and multiple edges and analyze their spatial variation. For another simple regular models where it is difficult to obtain the analytic expression of the zero point, we try to use the profile zero points to analyze the spatial variation. The test results show that the spatial variation laws of both first- and second-order vertical derivative zero points are almost the same but the second-order derivative zero point position is closer to the top surface edge of the geological bodies than the first-order vertical derivative and has a relatively high resolution. Moreover, with an increase in buried depth, for a single boundary model, the vertical derivative zero point location tends to move from the top surface edge to the outside of the buried body but finally converges to a fixed value. For a double boundary model, the vertical derivative zero point location tends to migrate from the top surface edge to the outside of the buried body. For multiple boundary models, the vertical derivative zero point location converges from the top surface edge to the outside of the buried body where some zero points coincide and finally vanish. Finally, the effectiveness and reliability of the proposed method is verified using real field data. 展开更多
关键词 vertical derivative zero point spatial variation law edge location
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ON THE EXISTENCE OF ZERO POINTS OF A CONTINUOUS FUNCTION 被引量:7
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作者 J.M. SorianoDepartamento de Andlisis Matematico, Facultad de Matemdticas, Universidad de Sevilla, Aptdo. 1160, Sevilla 41080, Spain 《Acta Mathematica Scientia》 SCIE CSCD 2002年第2期171-177,共7页
A sufficient condition is given to assert that a continuous mapping between Rm and Rn has a zero. The constructive proof of the result is based upon continuation methods and supplies the existence of a path leading to... A sufficient condition is given to assert that a continuous mapping between Rm and Rn has a zero. The constructive proof of the result is based upon continuation methods and supplies the existence of a path leading to the zero point. 展开更多
关键词 zero point continuation methods Banach fixed point theorem HOMOTOPY topological direct sum ISOMORPHISM k-contractive mapping
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Influence of acceleration stage electrode voltage on the performance of double-stage Hall effect thruster with adjustable zero magnetic point 被引量:1
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作者 陈龙 高维富 +5 位作者 崔作君 段萍 许雪松 阚子晨 檀聪琦 陈俊宇 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第6期60-69,共10页
The configuration of electrode voltage and zero magnetic point position has a significant impact on the performance of the double-stage Hall effect thruster. A 2D-3V model is established based on the two-magnetic peak... The configuration of electrode voltage and zero magnetic point position has a significant impact on the performance of the double-stage Hall effect thruster. A 2D-3V model is established based on the two-magnetic peak type double-stage Hall thruster configuration, and a particle-in-cell simulation is carried out to investigate the influences of both acceleration electrode voltage value and zero magnetic point position on the thruster discharge characteristics and performances.The results indicate that increasing the acceleration voltage leads to a larger potential drop in the acceleration stage, allowing ions to gain higher energy, while electrons are easily absorbed by the intermediate electrode, resulting in a decrease in the anode current and ionization rate. When the acceleration voltage reaches 500 V, the thrust and efficiency are maximized, resulting in a 15%increase in efficiency. After the acceleration voltage exceeds 500 V, a potential barrier forms within the channel, leading to a decrease in thruster efficiency. Further study shows that as the second zero magnetic point moves towards the outlet of the channel, more electrons easily traverse the zero magnetic field region, participating in the ionization. The increase in the ionization rate leads to a gradual enhancement in both thrust and efficiency. 展开更多
关键词 Hall thruster particle-in-cell simulation intermediate electrode zero magnetic point
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The ~3.6 to 3.7 M Paucity in Global Earthquake Frequency: Potential Coupling to Zero Point Fluctuation Force and Quantum Energies 被引量:1
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作者 David A. E. Vares Michael A. Persinger 《International Journal of Geosciences》 2013年第10期1321-1325,共5页
There has been protracted historical evidence of a relative paucity in the distribution frequency of global earthquakes within the M = 3.5 to 4.0 range. We observed a similar phenomenon for all recently recorded earth... There has been protracted historical evidence of a relative paucity in the distribution frequency of global earthquakes within the M = 3.5 to 4.0 range. We observed a similar phenomenon for all recently recorded earthquakes from January 2009 through August 2013. Frequency distributions with increments of M = 0.1 verified the trough of the diminished incidence to be between M = 3.6 and 3.7 with an abrupt increase between M = 3.9 and 4.0. The calculated equivalent photon wavelength for the energies associated with M = 3.6 approaches Planck’s Length while the related time increment is the cutoff frequency for the Zero Point Fluctuation force coupled to gravity. The conspicuous congruence between Planck’s time and length and the lower than expected frequency based upon Gaussian assumptions of distribution for the discrete band of energy associated with this magnitude range of earthquakes suggests a conduit may exist between intrinsic features of Planck space-time and geophysical processes. The existence of such a connection would encourage alternative explanations for sun-seismic activities as due to solar instabilities. Instead, it may reflect influence upon both from alterations in the structure of space being traversed by the solar system as it moves through the galaxy. 展开更多
关键词 Low MAGNITUDE Earthquake Frequency GAUSSIAN Distribution Planck’s Length Energy zero point FLUCTUATION Frequencies QUANTUM GEOPHYSICAL Effects
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ZEROS AND FIXED POINTS OF DIFFERENCE OPERATORS OF MEROMORPHIC FUNCTIONS 被引量:1
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作者 崔巍巍 杨连忠 《Acta Mathematica Scientia》 SCIE CSCD 2013年第3期773-780,共8页
Let f be a transcendental meromorphic function and △f(z) = f(z + 1) -- f(z) A number of results are proved concerning the existences of zeros and fixed points of Af(z) and △f(z)/f(z) when f(z) is of o... Let f be a transcendental meromorphic function and △f(z) = f(z + 1) -- f(z) A number of results are proved concerning the existences of zeros and fixed points of Af(z) and △f(z)/f(z) when f(z) is of order σ(f)=1. Examples show that some of the results are sharp. 展开更多
关键词 Entire functions meromorphic functions complex difference fixed points zeroS
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On the Cosmical Zero Point Energy Density 被引量:1
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作者 Bo Lehnert 《Journal of Modern Physics》 2016年第10期1112-1119,共8页
The frequency spectrum of the cosmical Zero Point Energy (ZPE) and its total density are so far unknown in their details. In the present complementary investigation, a revised theory forms the basis for studies of thi... The frequency spectrum of the cosmical Zero Point Energy (ZPE) and its total density are so far unknown in their details. In the present complementary investigation, a revised theory forms the basis for studies of this concept in two respects. It first applies to the observable universe considered as an entity, as well as to included subregions such as the galaxies with supermassive black holes. Second, experiments are proposed on the maximum Casimir force arising between two metal plates of different materials and with a vanishing air gap in their spacing. This serves the purpose of making an indirect determination of the ZPE energy density in the laboratory, i.e. at the Earth’s orbit. The ZPE energy density is interpreted as dark matter density and its pressure gradient as dark energy force density. 展开更多
关键词 zero point Energy Casimir Force Dark Matter Dark Energy
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Zero Point of Charge of Organo—Mineral Complexes
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作者 M.T.ANSARI XUJIAN-MING 《Pedosphere》 SCIE CAS CSCD 1994年第3期269-276,共8页
Five soil samples collected from China and two soil samples from Pakistan with widely different origin and characteristics were used to study the zero point of charge (ZPC) of soil colloids. The results showed that th... Five soil samples collected from China and two soil samples from Pakistan with widely different origin and characteristics were used to study the zero point of charge (ZPC) of soil colloids. The results showed that the value of zero point of charge of H-clay complexes was lower than that of H-clays in all the samples.Natural clay complexes had the highest ZPC as compared to H-clay complex and H-clay in alfisol, closer to H-clays rather than H-clay complexes in oxisol and udult. The delta value of ZPT (zero point of titration)to ZPC was higher in H-clay complexes than in H-clays. 展开更多
关键词 organo-mineral complexes soil colloids zero point of charge
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The Isoelectric Point and the Points of Zero Charge of Fe-Al-Mg Hydrotalcite-like Compounds
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作者 DongXiangLI WanGuoHOU +2 位作者 ShuPingLI MingTuHAO GaoYongZHANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第2期224-227,共4页
The relation of the isoelectric point (IEP) and the point of zero net charge (PZNC) of the hydrotalcite-like compounds was discussed. It was found that the IEP does not equal to the PZNC and the IEP is higher than th... The relation of the isoelectric point (IEP) and the point of zero net charge (PZNC) of the hydrotalcite-like compounds was discussed. It was found that the IEP does not equal to the PZNC and the IEP is higher than the PZNC. The structural positive charges existing in the HTlc, which cause the difference between the IEP and the PZNC. The effects of the structural positive charges of the HTlc on its IEP and PZNC are the same as the specific adsorption of metal cations. 展开更多
关键词 Isoelectric point points of zero charge potentiometric titration hydrotalcite-like compounds.
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Exploring point zero:a study of 20 Chinese cities
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作者 Qi Zhou Mingjian Zhai Wenhao Yu 《Geo-Spatial Information Science》 SCIE CSCD 2020年第3期258-272,I0006,共16页
A point zero represents a central geographical location of a city,which is essential for not only measuring distances,but also understanding the historical and/or cultural origin of a city.Although extensive studies h... A point zero represents a central geographical location of a city,which is essential for not only measuring distances,but also understanding the historical and/or cultural origin of a city.Although extensive studies have focused on delineating city centers,to our knowledge,no studies have paid attention to determining the location for a point zero.Here,our goal is to investigate various potential approaches for identifying such a location.Specifically,three typical approaches,geometric-based,topological-based,and thematic-based,are proposed to recommend point zeros and different scales,administrative divisions,kernel density sur-faces,and regions enclosed by ring roads are used for analysis.The effectiveness of different approaches and scales are evaluated and compared by calculating an offset distance between recommended and actual point zero locations in 20 Chinese cities.Using the different approaches,the average offset distance for most Chinese cities is 2-4 km,and the thematicbased approach performs best.Both the topological-based and thematic-based approaches are less sensitive to the analyzed scale than the geometric-based approach.The results indicate that it is possible to determine the approximate location for a point zero from geographical data.Based on the buffer zone of such a location,an actual point zero may further be recommended. 展开更多
关键词 point zero city center geographical data Chinese cities
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Mode Interaction at a Triple Zero Point of O(2) symmetric Nonlinear Systems with Two Parameters
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作者 吴微 孟繁友 《Northeastern Mathematical Journal》 CSCD 2000年第1期10-20,共11页
We consider a triple zero point of nonlinear equations with O(2 symmetry, where the Jacobian has a zero eigenvalue of geometric multiplicity one and algebraic multiplicity three. We show that this triple zero point e... We consider a triple zero point of nonlinear equations with O(2 symmetry, where the Jacobian has a zero eigenvalue of geometric multiplicity one and algebraic multiplicity three. We show that this triple zero point exhibits a new bifurcation phenomenon, that is, a mode interaction of the following three paths: bifurcation points from steady states, steady states and rotating waves to standing waves, rotating waves and modulated rotating waves respectively. 展开更多
关键词 mode interaction BIFURCATION triple zero point O(2) symmetry nonlinear system
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Some Consequences of Zero Point Energy
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作者 Bo Lehnert 《Journal of Electromagnetic Analysis and Applications》 2014年第10期319-327,共9页
Both theory and experiments indicate that the vacuum is not a state of empty space, but is populated by electromagnetic fluctuations at a lowest nonzero level, the Zero Point Energy (ZPE). This debouches into consider... Both theory and experiments indicate that the vacuum is not a state of empty space, but is populated by electromagnetic fluctuations at a lowest nonzero level, the Zero Point Energy (ZPE). This debouches into considerable changes of fundamental physics, as shown by a revised quantum electrodynamic theory (RQED) applied to elementary particles, and by a revised ZPE frequency spectrum applied to the expanding universe. The Standard Model based on a vacuum state of empty space is thus replaced by RQED, thereby resulting in massive elementary particles from the beginning, independently of the theory by Higgs. Also the basic properties of the Higgs-like particle detected at CERN can be reproduced by RQED. It further leads to new fundamental results beyond the theories by Dirac and Higgs, such as to a deduced value of the elementary net charge, magnetic confinement of charged particle configurations, intrinsic local particle charges, photon spin with a very small but nonzero photon rest mass, and needle-like particle-wave properties which contribute to the understanding of the photoelectric effect and two-slit experiments. The real macroscopic pressure due to the revised ZPE frequency distribution further influences the dynamics of the expanding universe, by the ZPE photon pressure gradient acting as dark energy, and the ZPE photon energy density acting as dark matter. This results in a model being consistent with the observed scale, the rate of expansion, and the stability of a flat expanding observable universe. 展开更多
关键词 zero point ENERGY Quantum ELECTRODYNAMICS Standard Model and Beyond EXPANDING UNIVERSE DARK ENERGY DARK MATTER
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A Measure System of Zero Moment Point Using Wearable Inertial Sensors
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作者 Xianggang Zhang Hao Wang +3 位作者 Yuliang Shi Changjun Fu Huiqin Wang Guoyu Wang 《China Communications》 SCIE CSCD 2016年第5期16-27,共12页
Keeping balance is the premise of human walking. ZMP(zero moment point) is a point where total torque achieves balance. It is an important evaluation parameter of balance ability in walking, since it can be used to be... Keeping balance is the premise of human walking. ZMP(zero moment point) is a point where total torque achieves balance. It is an important evaluation parameter of balance ability in walking, since it can be used to better reflect the dynamic balance during walking. ZMP can be used in many applications, such as medical rehabilitation, disease diagnosis, treatment and etc. In this paper, wearable inertial sensors system based on MEMS is used to measure ZMP(zero moment point) during walking, which is cheap, convenient, and free from the restriction of lab. Our wearable ZMP measurement system consists of inertial measurement subsystem and PC real-time monitoring station. Inertial measurement subsystem includes 9-axis inertial sensing nodes, the body communication network and the central node. Inertial sensing nodes are mounted on different parts of the body to collect body posture information in real-time, and then the best estimation of current posture are obtained by Kalman filter. The data from sensors is aggregated to the central node through the CAN bus, and then ZMP is calculated. Finally, it can be showed in the PC monitoring station. Experiments prove the system can achieve real-time ZMP detection during walking. 展开更多
关键词 zero moment point body balance inertial measurement quaternion Kalman filter
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Zero Point Energy Effects on Quantum Electrodynamics
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作者 Bo Lehnert 《Journal of Modern Physics》 2015年第4期448-452,共5页
The vacuum is not a state of empty space, but is populated by electromagnetic fluctuations at a lowest nonzero level, the Zero Point Energy (ZPE). As distinguished from conventional theories, such as that of the Stand... The vacuum is not a state of empty space, but is populated by electromagnetic fluctuations at a lowest nonzero level, the Zero Point Energy (ZPE). As distinguished from conventional theories, such as that of the Standard Model, the present revised quantum electrodynamic theory (RQED) includes the ZPE in its field equations. This leads to new results far beyond those obtained from conventional theories such as those by Dirac and Higgs. Thus, the present theory results in massive elementary particles from the beginning, being independent of the theory by Higgs. This paper describes the background and results of RQED, summarizing the weak points of conventional theories, the unification of included fundamental concepts, the present basic field equations, new obtained results, and special points of experimental support. In other words, the new points stressed in this paper are in particular the relation between a nonzero electric field divergence in the vacuum and the ZPE, and a number of new experimentally supported results due to a nonzero ZPE energy density in the same state. 展开更多
关键词 zero point Energy QUANTUM ELECTRODYNAMICS Standard Model and BEYOND
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Superconductivity, Superfluidity and Zero-Point Oscillations
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作者 Boris V. Vasiliev 《Journal of Modern Physics》 2018年第3期315-319,共5页
It is shown that both super phenomena-superconductivity and superfluidity are based on the same mechanism of streamline of zero-point oscillations. Proof of this is the agreement of obtained theoretical estimations wi... It is shown that both super phenomena-superconductivity and superfluidity are based on the same mechanism of streamline of zero-point oscillations. Proof of this is the agreement of obtained theoretical estimations with measured data. 展开更多
关键词 SUPERCONDUCTIVITY SUPERFLUIDITY zero-point OSCILLATIONS
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An Analogy between the Properties of “Dark Energy” and Physical Vacuum Consisting of Quantum Harmonic Oscillators Characterized by Zero-Point Energy
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作者 Liudmila B. Boldyreva 《Journal of Modern Physics》 2019年第1期20-34,共15页
In quantum field theory, the physical vacuum, free from magnetic and electric fields (without regard to gravitational energy), is defined not as an empty space but as the ground state of the field consisting of quantu... In quantum field theory, the physical vacuum, free from magnetic and electric fields (without regard to gravitational energy), is defined not as an empty space but as the ground state of the field consisting of quantum harmonic oscillators (QHOs) characterized by zero-point energy. The aim of this work is to show that such physical vacuum may possess the properties similar to the properties of dark energy: the positive density, the negative pressure, and the possibility of so-called accelerated expansion. In the model discussed, the mass of QHOs determines the positive density of dark energy. The observed electric polarization of physical vacuum in an electric field means the existence of electric dipole moment of QHO, which, in turn, suggests the existence inside the QHO of a repulsive force between unlike charges compensating the attractive Coulomb force between the charges. The existence of such repulsive force may be treated as the existence of omniradial tensions inside every QHO. In terms of hydrodynamics, it means that the vacuum with this property may be regarded as a medium with negative pressure. The electric dipole-dipole interaction of QHOs under some condition may result in the expansion of physical vacuum consisting of QHOs. It is shown also that the physical vacuum consisting of QHOs is a luminiferous medium, and based on this concept the conditions are discussed for the emergence of invisiblity of any objects (in particular, dark matter). The existence of luminiferous medium does not contradict the second postulate of special relativity (the principle of constancy of the velocity of light in inertial systems), if to take into account the interaction of photons with QHOs and with virtual photons (the virtual particles pairs) created by quantum entities that constitute the inertial systems. 展开更多
关键词 DARK ENERGY DARK MATTER zero-point ENERGY Quantum Harmonic Oscillator COSMIC Microwave Background
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一种高电源抑制比低功耗LDO设计
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作者 师全涛 吴巍 王俊峰 《电子元件与材料》 北大核心 2026年第1期27-34,共8页
为满足射频电路对中高频段高电源抑制特性(PSR)和较低功耗的需求,本文提出了一种高电源抑制比、低功耗的LDO设计。通过在误差放大器输出端与功率管栅端之间引入低输出阻抗的缓冲器和自适应动态零点补偿电路,有效保证系统稳定性,同时扩展... 为满足射频电路对中高频段高电源抑制特性(PSR)和较低功耗的需求,本文提出了一种高电源抑制比、低功耗的LDO设计。通过在误差放大器输出端与功率管栅端之间引入低输出阻抗的缓冲器和自适应动态零点补偿电路,有效保证系统稳定性,同时扩展了PSR带宽,实现了中高频段的高电源抑制特性。采用固定偏置和自适应偏置相结合的缓冲器以及静态电流更低的亚阈值CMOS基准,降低了整体功耗。电路设计采用SMIC 55 nm CMOS工艺,电路整体实现了1.7~3 V的电源电压输入范围,以及1.2 V的输出电压值和500μA~50 mA负载电流。结果表明,在50 mA负载电流下,LDO的PSR在100 kHz时为-61.2 dB,在1 MHz时为-63 dB,最小静态电流仅为40.4μA。该LDO适用于对电源纹波敏感的设备。 展开更多
关键词 电源抑制比 稳定性 零点补偿 低静态电流 自适应偏置 CMOS基准
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一个非可微条件下的全局隐函数定理
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作者 罗春林 武淑霞 赵江林 《高等数学研究》 2026年第1期33-34,122,共3页
应用连续函数的零点定理证明了在非可微条件下的一个全局隐函数定理,推广了教材和参考文献中的一些相应结论,为数学的定理教学和培养学生创新意识起到一定的作用.
关键词 全局隐函数 存在性定理 零点定理 强单调
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不同性别中颏突度的美学评估
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作者 卢艳萍 陈斌 《中国城乡企业卫生》 2026年第1期60-64,共5页
目的通过不同评价者对男性和女性颏突度变化,采用视觉模拟评分法(VAS)评分,探讨性别差异是否为影响颏部审美的另一个因素。方法选取天津市南开区王顶堤医院男女年轻医生志愿者各1名,直面型,∠SNA、∠SNB、∠ANB数值在正常范围内。采用ph... 目的通过不同评价者对男性和女性颏突度变化,采用视觉模拟评分法(VAS)评分,探讨性别差异是否为影响颏部审美的另一个因素。方法选取天津市南开区王顶堤医院男女年轻医生志愿者各1名,直面型,∠SNA、∠SNB、∠ANB数值在正常范围内。采用photoshop CC软件将男女志愿者侧面像分别以2 mm为梯度,使软组织颏前点沿矢状轴前后移动,移动幅度为零子午线前后10 mm,共11个梯度值,得出22张侧面像。口腔正畸医师、口腔全科医师、普通大众对侧面像进行VAS评分。结果在男性侧貌图中正畸医生组在颏突度0 mm时得分最高;口腔全科医生组在颏突度-2 mm得分最高;普通大众在颏突度-4 mm得分最高。在女性性侧貌图中正畸医生组在颏突度0 mm时得分最高;口腔全科医生组和普通大众在颏突度2 mm得分最高。结论可见正畸医生认为在男女侧貌颏突度在零子午线上最美观,而口腔全科医生和普通大众的观点较一致认为男性颏部前突-2 mm和-4 mm,女性颏部前突2 mm最美观。 展开更多
关键词 颏突度 面部美学 软组织颏前点 零子午线
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一种高精度片上电阻型CMOS温度传感器设计
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作者 黄东 赵胜伟 张家梁 《西安邮电大学学报》 2026年第1期59-69,共11页
针对多相滤波器(Poly-Phase Filter,PPF)加锁频环(Frequency-Locked Loop,FLL)架构的温度传感器需要多点校准以实现低于±1℃温度误差的问题,设计一种高精度片上电阻型CMOS温度传感器,以减小比较器失调电压对精度的影响。该传感器... 针对多相滤波器(Poly-Phase Filter,PPF)加锁频环(Frequency-Locked Loop,FLL)架构的温度传感器需要多点校准以实现低于±1℃温度误差的问题,设计一种高精度片上电阻型CMOS温度传感器,以减小比较器失调电压对精度的影响。该传感器的感温前端由两个温敏电阻和两个基准电容构成的RC多相滤波器组成,通过锁频环读出与温度相关的频率。通过引入失调校准放大器和双边沿检测频率相位检测器,实现了带预放大电路的双过零检测方案。这两项技术的结合显著降低了失调电压对系统精度的影响。基于TSMC 65nm CMOS工艺,设计并仿真实现了一款温度传感器。该传感器在0.9V电源电压下的功耗为88.6μW,在0.85V至1.3V电源电压范围内表现出0.33℃/V的电源灵敏度。在250μs和1ms的转换时间里,传感器的温度分辨率分别达到0.013℃和0.0023℃。经过单点修调后,在-40℃至125℃的宽温度范围内,传感器的前仿真测量精度为±0.9℃,后仿真测量精度为±1.03℃。仿真结果表明,采用带预放大电路的双过零检测方案能够显著提高PPF+FLL架构温度传感器的精度。 展开更多
关键词 电阻型温度传感器 单点修调 双过零检测方案 失调校准放大器 锁频环
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质量问题处理TCI模型的构建与应用研究
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作者 德馨 《科技创新与应用》 2026年第7期125-128,共4页
面对质量问题久拖不决、质量责任含糊不清、实物质量提升迫在眉睫的现状,该文基于航空工业光电所质量问题和改进工作,在质量问题处理工作规范的基础上,提出质量问题排故激励及“红黄榜”考核、质量积分评价和思想归零等管理方法,并融合... 面对质量问题久拖不决、质量责任含糊不清、实物质量提升迫在眉睫的现状,该文基于航空工业光电所质量问题和改进工作,在质量问题处理工作规范的基础上,提出质量问题排故激励及“红黄榜”考核、质量积分评价和思想归零等管理方法,并融合质量问题双五归零质量问题根源分析及体系映射,创新性提出基于质量提升的质量问题处理TCI模型,有助于质量问题快速、有效、彻底解决。 展开更多
关键词 闭环管控“红黄榜”考核 质量积分评价 管理归零 质量责任落实 质量问题处理TCI模型
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