mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Cerium, manganese and cerium/manganese ceramic monolithic catalysts. Study of VOCs and PM removal

Ceramic supported cerium, manganese and cerium-manganese catalysts were prepared by direct impregnation of aqueous precursor, and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller method (BET), temperature programmed reduction (H_2-TPR), X-ray photoelectron spectroscopy (XPS) acidity measurements and electrical conductivity. The catalytic activity was evaluated for volatile organic compounds (VOC) (ethanol, methyl ethyl ketone and toluene) oxidation. Additionally, catalysts were tested in particulate matter (PM) combustion. The characterization results indicated that Ce was in the form of Ce~(4+) and Ce~(3+), and Mn existed in the form of Mn~(4+) and Mn~(3+) on the surface of the Mn/AC sample and in the form of Mn~(4+) in the Ce/Mn/AC monolith. VOC oxidation results revealed that the Ce/Mn/AC sample showed an excellent performance compared with ceramic supported CeO_2 (Ce/AC) and MnO_x (Mn/AC) samples. The PM combustion was also higher on Ce/Mn/AC monoliths. The enhanced catalytic activity was mainly attributed to the Ce and Mn interaction which enhanced the acidity, conductivity and the reducibility of the oxides.
Influence of dysprosium substitution on magnetic and mechanical properties of high intrinsic coercivity Nd-Fe-B magnets prepared by double-alloy powder mixed method

The double-alloy powder mixed method is very proper for developing new small-mass products by changing the composition of sintered Nd-Fe-B magnets, and there is little research on this aspect. The variation on magnetic and mechanical properties of high intrinsic coercivity Nd-Fe-B magnets prepared by double-alloy powder mixed method was discussed, which is a method blending two-type main phase alloy powders with different components. The results showed that the intrinsic coercivity and density of sintered Nd-Fe-B magnets increased gradually with the increase in Dy content, and the double-alloy powder mixed method could obtain high intrinsic coercivity Nd-Fe-B magnets with good crystallographic alignment and microstructure. The bending strength of sintered Nd-Fe-B magnets declined, and the Rockwell hardness of sintered Nd-Fe-B magnets first declined, and then increased with the increase in Dy content. The microstructure showed that there existed the phenomenon that the Dy element diffused into main phase during sintering process, and the distribution of Dy content in main phase had some variation in homogeneity as a result of incomplete reaction between the double-alloy powder types.
Application of Terahertz Technology for Neuroscience

Brain is the most complex organ of human beings. The complete understanding of human brains' functions is an ongoing challenge for neuroscience. Although there are many techniques used for brain research, neuroscientists, physicists, and engineers are still exploring other access of research for applications. Terahertz (THz) spectroscopy and imaging may create such a space for brain research. THz spectroscopic technique, which is a novel medical imaging modality, attracts attention of biomedical applications due to its unique features including non-invasive, non-ionizing, and high sensitivity to biomolecules and tissues. In this article, we introduce our recent investigations on neuroscience using THz techniques, meanwhile, introduce other's work in this field. Our and others' investigations indicate that the THz spectroscopy and imaging technique can be useful for diagnosing brain tumors and neurodegenerative diseases. THz spectroscopy and imaging has the potential to become real-time in vivo diagnostic methods.
Metallurgical concepts for optimized processing and properties of carburizing steel

Carburized steel grades are widely used in applications where high surface near hardness is required in combination with good core toughness as well as high strength and fatigue resistance. The process of carburizing lower to medium carbon containing steel can generally provide this combination of properties and has been practiced for several decades. Such steel is essential in the vehicle power-train,machines and power generation equipment. However, the increasing performance demands by such applications as well as economical considerations forced steel producers to develop better alloys and fabricators to design more efficient manufacturing processes. The present paper describes recent concepts for alloy design optimization of carburizing steel and demonstrates the forthcoming beneficial consequences with regard to manufacturing processes and final properties.
Comparison of Skull Morphology in Two Species of Genus Liua (Amphibia: Urodela: Hynobiidae), L. shihi and L. tsinpaensis

Skull characteristics play an important role in the systematics of tailed salamanders. In this study, the skulls of Liua shihi and L. tsinpaensis were compared using a clearing and double-staining technique. The results showed that in L. tsinpaensis, the vomerine tooth rows are in a shape, the length of the inner vomerine tooth series is nearly equal to that of the outer series, the vomerine tooth rows do not extend beyond the choanae, an ossified articular bone is absent, the basibranchial is rod shaped, the radial loops exhibit a figure-eight shape, the cornua has two cylindrical branches, the urohyal is rod shaped, and the end of the ceratohyal is not ossified; these features differ considerably from those of L. shihi. The ossification of the posterior portion of the ceratohyal and the present or absent of ossified articular might represent ecological adaptation to feeding in different environments.
Seismic dynamic monitoring in CO_2 flooding based on characterization of frequencydependent velocity factor

The phase velocity of seismic waves varies with the propagation frequency, and thus frequency-dependent phenomena appear when CO_2 gas is injected into a reservoir. By dynamically considering these phenomena with reservoir conditions it is thus feasible to extract the frequency-dependent velocity factor with the aim of monitoring changes in the reservoir both before and after CO_2 injection. In the paper, we derive a quantitative expression for the frequency-dependent factor based on the Robinson seismic convolution model. In addition, an inversion equation with a frequency-dependent velocity factor is constructed, and a procedure is implemented using the following four processing steps: decomposition of the spectrum by generalized S transform, wavelet extraction of cross-well seismic traces, spectrum equalization processing, and an extraction method for frequency-dependent velocity factor based on the damped least-square algorithm. An attenuation layered model is then established based on changes in the Q value of the viscoelastic medium, and spectra of migration profiles from forward modeling are obtained and analyzed. Frequency-dependent factors are extracted and compared, and the effectiveness of the method is then verified using a synthetic data. The frequency-dependent velocity factor is finally applied to target processing and oil displacement monitoring based on real seismic data obtained before and after CO_2 injection in the G89 well block within Shengli oilfield. Profiles and slices of the frequency-dependent factor determine its ability to indicate differences in CO_2 flooding, and the predicting results are highly consistent with those of practical investigations within the well block.
Comparative Effects of Avoidance and Immunization on Epidemic Spreading in a Dynamic Small-World Network with Community Structure

Considering the actual behavior of people’s short-term travel, we propose a dynamic small-world community network model with tunable community strength which has constant local links and time varying long-range jumps. Then an epidemic model of susceptible-infected-recovered is established based on the mean-field method to evaluate the inhibitory effects of avoidance and immunization on epidemic spreading. And an approximate formula for the epidemic threshold is obtained by mathematical analysis. The simulation results show that the epidemic threshold decreases with the increase of inner-community motivation rate and inter-community long-range motivation rate, while it increases with the increase of immunization rate or avoidance rate. It indicates that the inhibitory effect on epidemic spreading of immunization works better than that of avoidance.
Rapid Hydrothermal Synthesis of Submillimeter Ultralong Flexible Hydroxyapatite Fiber Using Different pH Regulators

Hydroxyapatite fiber (HAF) was fabricated via a one-step hydrothermal route by using urea (CA), acetamide(AA) and propanamide (PA) as pH regulators, respectively, and the reaction time was only 0.5 h. The HAF synthesized by CA as the pH regulator was agglomerated with irregular morphology, while using AA or PA as the pH regulator, the HAF was composed of well-dispersed fibers with lengths larger than 200 μm. Two different morphologies form mainly due to the different hydrolysis rates of the pH regulators. Most of the fibers synthesized by the three pH regulators showed curving appearance, implying their outstanding flexibility. The technique in this paper allows the rapid formation of flexible HAF and may have wider applications in the restorations and reinforcement composites.
胶粘剂致裁剪缝纫车间工人胃肠道反应8例分析

胶粘剂是粘合物体的重要介质,在工业生产中广泛使用。胶粘剂种类较多,成分比较复杂,所含的有害因素包括苯系物(苯、甲苯、二甲苯)、三氯乙烯和二甲基甲酰胺等,主要危害人的皮肤、肺、肝脏、胃肠、神经系统、生殖系统和心血管系统等。2011年4月,某加工企业裁剪缝纫车间有8名职工在生产过程中出现腹痛、腹胀、恶心等症状,并在医院进行诊治。我们对患者及其工作环境进行了调查,现报告如下.
乏脂性湿疹1例

白介素-2(IL-2)是急性髓细胞白血病维持巩固阶段相对安全、有效的治疗药物。乏脂性湿疹又称为干性湿疹、裂纹性湿疹,多见于中老年人及20 ~40岁人群,主要与皮肤水合能力降低、皮脂分泌减少、过度烫洗等有关,本例 IL-2制剂治疗3天后出现原有症状加重,停用IL-2及对症处理后皮损已逐渐好转。本例患者前后次皮损变化与应用IL-2有时间相关性,故考虑此次乏脂性湿疹加重是由IL-2引起。
Water quality model with multiform of N/P transport and transformation in the Yangtze River Estuary

As the Yangtze River Estuary and adjacent sea have been classified as a problem area with regard to eutrophication, it is important to explore the spatial and temporal variations of nitrogen and phosphorus (N/P) nutrients in this area. Based on danish hydraulic institute (DHI)’s open platform Ecolab, a hydrodynamic and water quality model was developed for the Yangtze River Estuary, in which the transport and transformation processes of different forms of N/P nutrients were considered. Validations against measured data show that the model is overall reliable. Preliminary application of the model suggests that the model can simulate the characteristics of high phosphorus concentration area in the Yangtze River Estuary, and the high concentration area is closely related to the resuspension process of particulate phosphorus.
旅游与生计可视化分析

旅游发展对当地居民的生计具有重要影响,旅游与生计研究业已成为学术界关注的热点领域。以Web of science 核心库中1994—2016年间收录相关主题的文献为基础,利用可视化软件CiteSpace和Carrot2对旅游与生计研究的前沿热点、知识基础和合作网络进行分析。研究发现,旅游与生计研究涉及多个学科,主要集中在生态、环境、管理和地理等学科领域;“乡村旅游”、“保护区旅游”、“文化旅游”、“海洋旅游”等是旅游与生计研究的热点议题;旅游与生计研究的知识基础主要包括“保护区管治”、“成本效益分析”、“乡村旅游”、“乡村发展”等研究领域。
Process, mechanism and impacts of scale formation in alkaline flooding by a variable porosity and permeability model

In spite of the role of alkali in enhancing oil recovery (EOR),the formation of precipitation during alkaline-surfactant-polymer (ASP) flooding can severely do harm to the stratum of oil reservoirs,which has been observed in situ tests of oil fields such as scale deposits found in oil stratum and at the bottom of oil wells. On the other hand, remarkable variation of stratum parameters, e.g., pore radius, porosity,and permeability due to scale formation considerably affects seepage flow and alkaline flooding process in return. The objective of this study is to firstly examine these mutual influential phenomena and corresponding mechanisms along with EOR during alkaline flooding when the effects of precipitation are no longer negligible. The chemical kinetic theory is applied for the specific fundamental reactions to describe the process of rock dissolution in silica-based reservoirs. The solubility product principle is used to analyze the mechanism of alkali scale formation in flooding. Then a 3D alkaline flooding coupling model accounting for the variation of porosity and permeability is established to quantitatively estimate the impact of alkali scales on reservoir stratum. The reliability of the present model is verified in comparison with indoor experiments and field tests of the Daqing oil field. Then,the numerical simulations on a 1/4 well group in a 5-spot pattern show that the precipitation grows with alkali concentration,temperature,and injection pressure and, thus,reduces reservoir permeability and oil recovery correspondingly. As a result, the selection of alkali with a weak base is preferable in ASP flooding by tradeoff strategy.
提高对儿童急性感染性腹泻病的认识

腹泻病是我国儿童常见的疾病,由多病因所致, 5岁以下儿童腹泻的主要病因是各种病原体的感染,主要是病毒,其次细菌,寄生虫和真菌相对少见,临床表现多样,治疗原则虽相似,但治疗方案却各有不同。为了规范化诊断和治疗儿童腹泻病,世界卫生组织(WHO)及各国、各地区均制定了与之相适应的儿童腹泻病的指南或专家共识,1991年WHO制定了第1版儿童急性腹泻病指南,2005年WHO及联合国儿童基金会(UNICEF)制定了第2版,我国专家分别于1993年、2009年参照WHO指南的基础上,结合我国国情制定了中国儿童急性腹泻病的专家共识。这些共识对中国儿童急性腹泻病的规范诊治发挥了重要的作用。针对儿童感染性腹泻病,儿科消化病、儿科感染病以及流行病学专家根据循证医学原则,中华医学会儿科学分会消化学组及 《中华儿科杂志》编辑委员会制定“中国儿童急性感染性腹泻病临床实践指南”,旨在规范我国儿童感染性腹泻病诊断和治疗,现就液体疗法、营养治疗、抗感染治疗、中药治疗、疫苗几个问题进行讨论。
浙江省老年人维生素摄入与代谢综合征关系研究

维生素是一类微量的低分子有机化合物,虽不参加机体构成、不提供能量,但在机体物质和能量代谢过程起重要作用。大多数维生素不能在体内合成并大量储存,虽需要量很小,但必须由食物提供。较多研究表明,维生素对高血压、糖尿病等慢性病有一定防治作用,而较系统研究维生素摄入与代谢综合征(metabolic syndrome, MS)的关系则较少。本研究旨在了解浙江省老年人膳食维生素摄入情况,并探究维生素与MS及其组分的关系,为进一步开展营养干预并防控MS的发生发展提供科学参考。
应用7000C GC / MS / MS 气相色谱?三重串联四极杆质谱联用仪一针进样分析多种植物性食品中865种农药残留和环境污染物

本文介绍了用安捷伦7890B/7000C 气相色谱?三重串联四极杆质谱联用仪(GC/ MS/ MS)以及农残和环境污染物MRM 数据库创建的一针进样同时监测865种农残和环境污染物的分析方法.使用该方法分析了多种常见植物源性食品,包括玉米、青菜、西兰花、韭菜、橘子、番茄、大蒜.实验结果证明,安捷伦7000C GC/ MS/ MS不仅能够满足食品安全风险评估对大量样品当中众多化合物进行快速检测的高通量分析需求,而且在极端分析条件下仪器依然具有优异的灵敏度和稳定性.而同一化合物多离子对的同时检测还保证了基质干扰多样化情况下的高选择性.
新疆维吾尔自治区二级医院结直肠癌平均风险人群的结肠镜筛查情况

2014年,美国结直肠癌发病率和病死率在不同性别的恶性肿瘤中均居第3位。结直肠癌在中国的发展趋势同样迅猛,尤以长江三角洲地区为甚。结肠镜检查对控制结直肠癌发病率有重要作用,并可将其病死率降低53%。对平均风险人群进行结肠镜筛查是最为有效的预防结直肠癌的手段,被强烈推荐,并在一些国家获得医疗保险支持。我国早期结直肠癌及癌前病变筛查共识于2015年初发布,势必会使我国结直肠癌预防工作更正规和深入。然而本土数据的不足为评估结直肠癌的预防工作带来困难。我国疾病的地域分布差异明显,医疗资源分配极不均衡,既往国内研究多为经济较发达地区的大型医院完成,对偏远地区和少数民族群体相对缺少关注。本研究对新疆维吾尔自治区二级医院的数据进行回顾性分析,尤其关注结肠镜检查的质量控制指标和维吾尔族受检者的情况。
Controllable Discrete Rogue Wave Solutions of the Ablowitz-Ladik Equation in Optics

With the aid of symbolic computation Maple, the discrete Ablowitz-Ladik equation is studied via an algebra method, some new rational solutions with four arbitrary parameters are constructed. By analyzing related parameters, the discrete rogue wave solutions with alterable positions and amplitude for the focusing A blowitz-Ladik equations are derived. Some properties are discussed by graphical analysis, which might be helpful for understanding physical phenomena in optics.
Clinical variability and molecular heterogeneity in prostate cancer

Prostate cancer is a clinically heterogeneous disease,with some men having indolent disease that can safely be observed, while others have aggressive, lethal disease. Over the past decade,researchers have begun to unravel some of the genomic heterogeneity that contributes to these varying clinical phenotypes. Distinct molecular sub-classes of prostate cancer have been identified, and the uniqueness of these sub-classes has been leveraged to predict clinical outcomes, design novel biomarkers for prostate cancer diagnosis,and develop novel therapeutics. Recent work has also elucidated the temporal and spatial heterogeneity of prostate cancer, helping us understand disease pathogenesis, response to therapy,and progression. New genomic techniques have provided us with a window into the remarkable clinical and genomic heterogeneity of prostate cancer, and this new perspective will increasingly impact patient care.
家族性Peutz-Jeghers综合征伴多处小肠套叠一例

讨论Peutz-Jeghers综合征又名黑斑息肉病,临床特点有:①皮肤黏膜有异常色素沉着,常见部位在口唇及颊黏膜,其次为面、掌、指、趾等部位,往往双侧对称;②全胃肠道分布的多发性息肉,以小肠最常见,占70% ~ 90%,其中空肠最多见,其次为结肠息肉,胃息肉少见,呈散在分布。息肉虽非肿瘤性,但有肿瘤样增殖的特点,2% ~ 3%患者可以出现息肉恶变,且腺瘤越大,恶变率越高;③有一定的遗传家族史。本病例中以上临床表现均符合,诊断明确。本病常可引起腹痛、便血、黏液便,个别孤立较大息肉或多发息肉密集肠段可引起套叠或肠梗阻。临床上以肠套叠发病多见,本例患者有2次肠套叠手术史,且术中发现不止有1处肠套叠。目前对本病尚无有效的治疗方法,多主张对内镜检查所能够见到的息肉尽可能以在内镜下切除息肉为主。对肠套叠致完全性肠梗阻、个别孤立较大的息肉(直径>2 cm)或多发性息肉密集于某一肠段者则应手术治疗,手术方式包括息肉切除术和肠部分切除术。手术目的主要是解除临床症状并非根治,因此应尽量保留肠管的长度,避免出现短肠综合征等严重并发症。对高度怀疑癌变或病理证实已癌变者可行根治术。目前研究认为黑斑息肉病存在错构瘤-腺瘤-腺癌的过程,30岁以后及有家族史患者的恶变率明显上升,因此对黑斑息肉病患者在术后及其家族中有此病者均应长期随访。
Optimization Design for the Sandwich Piezoelectric Transmitters in Acoustic Logging

An optimized transducer prototype with a sandwich structure vibrated longitudinally is proposed for a transmitter in acoustic logging, especially in acoustic logging while drilling, by taking account of drilling environments with high temperature and pressure, as well as strong collar drilling vibration during the drilling process. Aimed to improve the transmitting performance, numerical and experimental studies for the transducer optimization are conducted. The impact of location and length of the piezoelectric stack on resonance characteristics and effective electromechanical coupling coefficient is calculated and analyzed. Admittance and transmitting performance of the proposed transducer are measured in laboratory experiments, and the results are compared with simulated ones. It is shown that the newly proposed transducer has higher transmitting performance with lower resonance frequencies. This work provides theoretical and experimental bases for transducer designing and acoustic wave measurements in acoustic logging, especially in acoustic logging while drilling.
A Gaussian Model for Anisotropic Strange Quark Stars

For studying the anisotropic strange quark stars, we assume that the radial pressure inside an anisotropic star can be obtained simply by isotropic pressure plus an additional Gaussian term with three free parameters (A, μ and x). According to recent observations, a pulsar in a mass range of 1.97±0.04M_⊙ has been measured. Hence, we take this opportunity to set the free parameters of our model. We fix x by applying boundary and stability conditions and then search the A — μ parameter space for a maximum mass range of 1.9M_⊙ < M_(max) < 2.1M_⊙. Our results indicate that anisotropy increases the maximum mass M_(max) and also its corresponding radius R for a typical strange quark star. Furthermore, our model shows magnetic field and electric charge increase the anisotropy factor ?. In fact, ? has a maximum on the surface and this maximum goes up in the presence of magnetic field and electric charge. Finally, we show that anisotropy can be more effective than either magnetic field or electric charge in raising maximum mass of strange quark stars.
A 40-GHz Colliding Pulse Mode-Locked Semiconductor Laser

A monolithically active-passive integrated colliding pulse mode-locked semiconductor laser is demonstrated in the InGaAsP/InP material system. The device is mode locked at the second harmonic passive mode-locking regime with a wide mode-locking range. Pulse trains with the repetition rate of 40 GHz, 3-dB rf line width of 25 kHz, the pulse width of 2.5 ps, and a nearly transform-limited time-band width product of 0.53 are obtained.
Filamentation of Metabolic Enzymes in Saccharomyces cerevisiae

Compartmentation via filamentation has recently emerged as a novel mechanism for metabolic regulation. In order to identify filamentforming metabolic enzymes systematically, we performed a genome-wide screening of all strains available from an open reading frame- GFP collection in Saccharomyces cerevisiae. We discovered nine novel filament-forming proteins and also confirmed those identified previously. From the 4159 strains, we found 23 proteins, mostly metabolic enzymes, which are capable of forming filaments in vivo. In silico protein-protein interaction analysis suggests that these filament-forming proteins can be clustered into several groups, including translational initiation machinery and glucose and nitrogen metabolic pathways. Using glutamine-utilising enzymes as examples, we found that the culture conditions affect the occurrence and length of the metabolic filaments. Furthermore, we found that two CTP synthases (Ura7p and Ura8p) and two asparagine synthetases (Asn1p and Asn2p) form filaments both in the cytoplasm and in the nucleus. Live imaging analyses suggest that metabolic filaments undergo sub-diffusion. Taken together, our genome-wide screening identifies additional filament-forming proteins in S. cerevisiae and suggests that filamentation of metabolic enzymes is more general than currently appreciated.
从“沙拉”到“鸡尾酒”: 中医课程体系转型刍议

在当前教育全球化的时代背景下,以培养临床实用人才为主要目标的“沙拉”式中医高等教育课程体系已显露出疲态,其最大的问题在于知识内容缺乏系统性,自我更新缓慢,与不断变化的教学形式难以匹配,人才培养的方向和模式单一,这些都将成为阻碍中医学科和中医事业在21世纪飞速发展的重要因素。笔者试图借助全新的“中国医学”范式,提出一种“鸡尾酒”式的课程体系构想,以辅助中医课程获得更多的灵活性、互动性和多元性。
不同产地不同部位3种穿心莲内酯成分研究

目的通过比较不同产地不同部位穿心莲药材中穿心莲内酯、新穿心莲内酯及脱水穿心莲内酯含量,为穿心莲药材种植及采收工作SOP提供支持,以及建议新增市场销售等级的评判标准。方法收集全国3个省不同产地9批穿心莲样品,按参考文献方法进行检测与分析。结果不同产地及批次穿心莲全草样品中穿心莲内酯、新穿心莲内酯、脱水穿心莲内酯总含量在0.849 % ~ 2.220 %之间;穿心莲不同部位三种内酯的总含量:叶中含量最高,茎次之,花中最少。结论穿心莲不同产地、不同采集方式及不同部位的含量均存在着显著差异,选择适宜的产地建立基地、适时采收及加工对穿心莲药材的质量控制意义重大。
魏军平治疗甲状腺功能减退症经验

魏军平教授是中国中医科学院广安门医院主任医师。在长期的临床实践中,对甲状腺功能减退及亚临床甲状腺功能减退的诊治积累了丰富的经验,有独到见解,并将其分为初期、中期、后期进行辨证施治。初期以肝郁脾虚、痰气交阻证为主,用半夏厚朴汤加减,抑或用四逆散、逍遥散进行治疗;中期以阳气不足、脾气虚衰证用主,用补中益气汤合四逆散加减治疗;后期以阳气不足、肾气虚衰证为主,用右归丸加减亦可用桂附地黄汤合真武汤加减治疗。有些患者就诊前有长期服用优甲乐的用药史,临床上出现口干、心慌、多汗、心烦意乱以及眠差、舌红等损伤阴液的症状,对于出现以上症状的患者配伍滋补肾阴的药物进行治疗,疗效显著。
冠状动脉微循环功能障碍的研究进展

冠状动脉微循环对血流代谢性调节发挥重要作用,微血管通过收缩和舒张功能调节冠状动脉血流量,影响心肌灌注。心外膜冠状动脉功能正常的情况下,心绞痛的发作与冠状动脉微循环功能障碍密切相关,可见微血管在调节心肌血流灌注中起关键作用。
无人机航摄拍照瞬间精确空间位置的确定

近年来,随着无人机与数码相机技术的发展,无人机航测以其高效、精确、作业成本低、适用范围广等特点,在地表复杂地区高分辨率影像的获取方面优势明显。无人机像片后续处理需要布设大量像控点,工作量大,耗时耗力,特别是在地表复杂地区。如果通过卫星定位的手段计算出拍照瞬间照片中心的精确位置和姿态,则可以节省大量施工投入,有效提高生产效率。本文即利用PPK作业方式进行航摄拍照瞬间空间位置的确定以进行研究。
单目视觉位移在线监测系统的设计与实现

系统采用红外LED灯作为观测目标,在相机感光元件前加装红外滤光片,以实现全天候观测目标的准二值影像获取。利用数字图像处理技术实现了影像上观测目标的高精度提取。测试结果表明,系统对5 m远处目标的实时监测精度优于1 mm。
浅谈快捷建库与数据处理系统的功能设计

介绍了快捷建库与数据处理系统涉及的内容和研究开发的技术路线,并对该系统的各项模块功能进行了详细的阐述,提出了基于ArcGIS平台实现系统各功能模块的理论可行性综合功能的操作方法。
Diving control of underactuated unmanned undersea vehicle using integral-fast terminal sliding mode control

The problem of diving control for an underactuated unmanned undersea vehicle (UUV) considering the presence of parameters perturbations and wave disturbances was addressesed. The vertical motion of an UUV was divided into two noninteracting subsystems for surge velocity control and diving. To stabilize the vertical motion system, the surge velocity and the depth control controllers were proposed using backstepping technology and an integral-fast terminal sliding mode control (IFTSMC). It is proven that the proposed control scheme can guarantee that all the error signals in the whole closed-loop system globally converge to the sliding surface in finite time and asymptotically converge to the origin along the sliding surface. With a unified control parameters for different motion states, a series of numerical simulation results illustrate the effectiveness of the above designed control scheme, which also shows strong robustness against parameters perturbations and wave disturbances.
A novel current vector decomposition controller design for six-phase permanent magnet synchronous motor

The vector control algorithm based on vector space decomposition (VSD) transformation method has a more flexible control freedom, which can control the fundamental and harmonic subspace separately. To this end, a current vector decoupling control algorithm for six-phase permanent magnet synchronous motor (PMSM) is designed. Using the proposed synchronous rotating coordinate transformation matrix, the fundamental and harmonic components in d–q subspace are changed into direct current (DC) component, only using the traditional proportional integral (PI) controller can meet the non-static difference adjustment, and the controller parameter design method is given by employing internal model principle. In addition, in order to remove the 5th and 7th harmonic components of stator current, the current PI controller parallel with resonant controller is employed in x–y subspace to realize the specific harmonic component compensation. Simulation results verify the effectiveness of current decoupling vector controller.