基于改进D-S理论的多时刻空中目标威胁评估

针对单时刻空中目标威胁评估存在的抗干扰能力弱、可靠性不足等问题,建立一种基于改进D-S证据理论的多时刻空中目标威胁评估模型。首先,根据空战时间线,定义多时刻空中目标威胁评估时段范围;然后,在单时刻空中目标威胁等级概率分配基础上,利用D-S证据理论融合各时刻证据信息;同时,针对D-S证据理论不能处理高冲突证据的弊端及其现有改进方法计算量较大的不足,引入偏移度的概念,确定各时刻证据源权重,对加权证据进行D-S融合。数值算例表明,该模型算法复杂度低;能有效处理波动数据、稳定性强,并且可减弱高冲突证据融合对威胁评估带来的不利影响,为最终决策提供了更准确的判别依据。

Strategies for Improving the Effectiveness of Professional Practice for Full-Time Professional Master Degree Postgraduate in Mineral Processing Engineering

In order to gain practical experience and hands-on skills,full-time professional master degree postgraduate in mineral processing engineering should engage in professional practices.Nonetheless,a series of problems,including insufficient time for practice,low management level,inadequate implementation of the double-supervisor system,and poor results of professional practice,has reduced the effectiveness of professional practice.In view of the aforementioned problems and the characteristics of the discipline,this paper proposes several strategies for improving the effectiveness of professional practice for postgraduates in mineral processing engineering.

基于S变换相关度的配电网单相接地自适应有源消弧法

提出了基于S变换相关度的配电网单向接地自适应有源消弧法,有效消除了配电网单相接地故障电弧,提升了电力系统稳定性。采集配电网线路零序电流时序数据,经S变换获取零序电流时频信息矩阵后,计算并获取各线路间时频信息矩阵相关度矩阵,输入卷积神经网络模型,输出单相接地故障选线结果;在故障线路采用基于模糊准PR与PI控制的双闭环自适应控制方法,向配电网故障线路中性点注入零序电流,有效控制注入电流相位以及幅值,迫使配电网故障线路所在相的电压值为0,完成自适应有源消弧。实验结果表明:该方法可有效识别配电网单相接地故障线路,实现配电网单相接地自适应有源消弧,且可尽快完成单相接地自适应有源消弧工作,保证配电网安全稳定运行。

A Contrastive Genre Analysis of English Abstracts of Bachelor's Degree Thesis:Economics and Humanities & Social Sciences

The move identification of the present study followed the four-move model of V.K.Bhatia who is the representative personage of ESP.It is composed of four moves(1993):Introducing purpose,Describing methodology,Summarizing results and Presenting conclusions.According to the above theory,Principles of the scientific method of sampling suggested by Nwogu(1997:121)as to the selection of journal were adopted in the study—representativity,reputation,accessibility.The focus is the analysis of move structures of abstract sections of them and contrastive studies between Economics and Humanities&Social Sciences of Lanzhou Jiaotong University in different moves of abstract sections.We find there are some similarities and differences between them.In general,the abstracts of Humanities&Social Sciences are more standard than Economics,which suggested English abstract sections of some Economics bachelor’s degree thesis need to be improved.

Research on Dynamic Relationship between Agricultural Insurance and Agricultural Disaster Degree

Agricultural insurance is an important system of rural financial support for agricultural development.Based on the analysis of agricultural insurance improving farmers'anti-risk ability and reducing the damage,the dynamic relationship is discussed with the adoption of error correction model and the data of Guangdong province between 1997 and 2010.The result shows that the promotion of agricultural insurance depth is beneficial to reducing agricultural damage degree and there exists long-term equilibrium relationship.More precisely,agricultural insurance depth is the Granger reason of agricultural damage degree while the reverse relationship has not been supported yet.Based on the empirical analysis,this paper discusses the characteristics and foundation of agricultural production as well as market characteristics of agricultural insurance to further explore the necessity of financial support.

Effect of Curing Regime on Degree of Al^(3+) Substituting for Si^(4+) in C-S-H Gels of Hardened Portland Cement Pastes

The effect of curing regime on degree ofAl3＋ substituting for Si^4＋ （Al/Si ratio） in C-S-H gels of hardened Portland cement pastes was investigated by 29Si magic angel spinning （MAS） nuclear magnetic resonance （NMR） with deconvolution technique. The curing regimes included the constant temperature （20, 40, 60 and 80 ℃） and variable temperature （simulated internal temperature of mass concrete with 60 ℃ peak）. The results indicate that constant temperature of 20 ℃ is beneficial to substitution ofAl3＋ for Si4＋, and AI/Si ratio changes to be steady after 180 d. The increase of Al/Si ratio at 40 ℃is less than that at 20℃ for 28 d. The other three regimes of high temperature increase Al/Si ratio only before 3 d, on the contrary to that from 3 to 28 d. However, the 20 ℃ curing stage from 28 to 180 d at variable temperature regime, is beneficial to the increase of AI/Si ratio which is still lower than that at constant temperature regime of 20 ℃ for the same age. A nonlinear relation exists between the Al/Si ratio and temperature variation or mean chain length （MCL） of C-S-H gels, furthermore, the amount ofAl3＋ which can occupy the bridging tetrahedra sites in C-S-H structure is insufficient in hardened Portland cement pastes.

Blunt dopamine transmission due to decreased GDNF in the PFC evokes cognitive impairment in Parkinson’s disease

Studies have found that the absence of glial cell line-derived neurotrophic factor may be the primary risk factor for Parkinson’s disease. However, there have not been any studies conducted on the potential relationship between glial cell line-derived neurotrophic factor and cognitive performance in Parkinson’s disease. We first performed a retrospective case-control study at the Affiliated Hospital of Xuzhou Medical University between September 2018 and January 2020 and found that a decreased serum level of glial cell line-derived neurotrophic factor was a risk factor for cognitive disorders in patients with Parkinson’s disease. We then established a mouse model of Parkinson’s disease induced by 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine and analyzed the potential relationships among glial cell line-derived neurotrophic factor in the prefrontal cortex, dopamine transmission, and cognitive function. Our results showed that decreased glial cell line-derived neurotrophic factor in the prefrontal cortex weakened dopamine release and transmission by upregulating the presynaptic membrane expression of the dopamine transporter, which led to the loss and primitivization of dendritic spines of pyramidal neurons and cognitive impairment. In addition, magnetic resonance imaging data showed that the long-term lack of glial cell line-derived neurotrophic factor reduced the connectivity between the prefrontal cortex and other brain regions, and exogenous glial cell line-derived neurotrophic factor significantly improved this connectivity. These findings suggested that decreased glial cell line-derived neurotrophic factor in the prefrontal cortex leads to neuroplastic degeneration at the level of synaptic connections and circuits, which results in cognitive impairment in patients with Parkinson’s disease.

From Pythagoras Theorem to Fermat’s Last Theorem and the Relationship between the Equation of Degree <i>n</i>with One Unknown

The most interesting and famous problem that puzzled the mathematicians all around the world is much likely to be the Fermat’s Last Theorem. However, since the Theorem was proposed, people can’t find a way to solve the problem until Andrew Wiles proved the Fermat’s Last Theorem through a very difficult method called Modular elliptic curves in 1995. In this paper, I firstly constructed a geometric method to prove Fermat’s Last Theorem, and in this way we can easily get the conclusion below: If a and b are integer and?a = b, n ∈ Q and n > 1, the value of c satisfies the function an + bn = cn that can never be integer;if a, b and c are integer and a ≠ b, n is integer and n > 2, the function an + bn = cn cannot be established.

Analysis on Observing Results ofVacuum Degree in Soft Groundby Vacuum-Surcharge Preloading

This paper analyzes the observing results of vacuum degree in the the Jialichen bridge-head experimental site .The cause of vacuum degree developing below groundwater table is pointed out. The influence of vacuum degree above the ground water table on pore water pressure is discussed. The results show that vacuum degree decreases along the depth because resistance. The resistance in the PVDS is lowest, in the silt is highest. Vacuum degree below groundwater table is produced mainly by dewatering or by escaping of sealed air from the end of flexible pipe. Vacuum degree above the ground water table in the sand drains makes great effect on pore water pressure. In the silt the pore water pressure does not change with the variation of vacuum degree under membrane in a short time.

对硫掺杂的Mn-Co氧化物SERS特性的研究

材料表面特性的调控可以通过杂原子掺杂、缺陷工程、表面功能化等多种方式来实现[1]。最近,我们研究小组展示了通过向Mn-Co氧化物中掺杂非金属硫来调节其能带和表面电子结构,通过硫掺杂所引起的电子结构的变化及基底表面的微电场的变化,来影响探针分子与基底之间的相互作用的方式和取向[2]。与此同时,随着Co^(2+)/Co^(3+)含量比例的增加,基底表面的电子密度增加,从而促进CT过程,进一步提高了电荷转移度。非金属掺杂策略对于半导体金属氧化物可以提供有效和稳定的SERS活性,也为探索催化中的CT和半导体的SERS性能之间的关系提供了一种新的策略。

SO_(2)对电化学传感器测定H_(2)S的影响

H_(2)S是固定污染源废气监测的重要成分。该研究选用几款H_(2)S电化学传感器和一款紫外荧光H_(2)S在线分析仪进行比对实验,系统研究了SO_(2)对H_(2)S测定结果的干扰程度、SO_(2)对H_(2)S电化学传感器灵敏度的影响,并探讨了SO_(2)对H_(2)S的干扰产生的原因。研究结果表明:紫外荧光分析仪测定H_(2)S时,示值和灵敏度不受固定污染源废气中SO_(2)的干扰;电化学传感器测定固定污染源废气中H_(2)S时,SO_(2)会对H_(2)S测定值有影响,SO_(2)质量分数越高,对H_(2)S测定值的干扰越大,而即使100μg·g^(-1)的SO_(2)仍然使H_(2)S示值增大很多;SO_(2)质量分数越大,H_(2)S电化学传感器的灵敏度降低越多。

Exploring the Gaps between Master's Degree Holders' Competence and Industrial Demands in Urban and Rural Planning: Senior Field Engineers' Observations and Reflexive Narrative

This paper examines the academic-work gap in terms of performance reality and performance expectations by expanding on the cultivation model of Master's students in the university context and the most recent industry requirements for talents'competence.The subjects of this paper are Master's degree holders,both academic and professional.The paper examines common issues encountered by enterprise professionals when employing Master's degree holders and proposes a university-enterprise joint cultivation model to achieve win-win outcomes for both higher education institutions and businesses.

高职高专院校高质量试点职教本科人才培养研究

职教本科是职业教育改革发展的必然结果,是经济社会高质量发展的应然需求,也是满足人们追求高层次职业教育的有效路径。高职高专院校试点职教本科人才培养,是服务国家发展战略、增强职业教育社会影响力和探索新型高职人才培养模式的客观需要。但是,由于受到政府、社会和学校等因素的影响制约,高职高专院校高质量试点职教本科教育面临着不少宏观层面和微观层面的现实性困境。对此,要完善政策体系建设,增强政策资源供给的有效性;引导社会树立正确职教观念,提升高职学生社会地位;深化产教协同育人,构建校企育人命运共同体;明确质量目标,强化专业特色发展;科学规划内部顶层设计,高效率使用育人资源;确立师资选拔培训机制,全面提升整体科研能力。

Imprisoned Former General Manager Working for Master's Degree

The following is a narration before the video camera of the Henan TV Station on December 27, 2003 by a prison inmate named Liu Xianwei,former general manager of the Zhengzhou Sanxing Company, who is now working for a master＇s degree in the prison.

Pythagorician Divisors and Applications to Some Diophantine Equations

We consider the Pythagoras equation X2 +Y2 = Z2, and for any solution of the type (a,b = 2sb1 ≠0,c) ∈ N*3, s ≥ 2, b1odd, (a,b,c) ≡ (±1,0,1)(mod 4), c > a , c > b, and gcd(a,b,c) = 1, we then prove the Pythagorician divisors Theorem, which results in the following: , where (d,d′′) (resp. (e,en)) are unique particular divisors of a and b, such that a = dd′′ (resp. b = ee′′ ), these divisors are called: Pythagorician divisors from a, (resp. from b). Let’s put λ ∈{0,1}, defined by: and S = s -λ (s -1). Then such that . Moreover the map is a bijection. We apply this new tool to obtain a new classification of the primitive, positive and non-trivial solutions of the Pythagoras equations: a2 + b2 = c2 via the Pythagorician parameters (d,e,S ). We obtain for (d, e) fixed, the equivalence class of any Pythagorician solution (a,b,c), checking , namely: . We also update the solutions of some Diophantine equations of degree 2, already known, but very important for the resolution of other equations. With this tool of Pythagorean divisors, we have obtained (in another paper) new recurrent methods to solve Fermat’s equation: a4 + b4 = c4, other than usual infinite descent method;and to solve congruent numbers problem. We believe that this tool can bring new arguments, for Diophantine resolution, of the general equations of Fermat: a2p + b2p = c2p and ap + bp = cp. MSC2020-Mathematical Sciences Classification System: 11A05-11A51-11D25-11D41-11D72.

基于德尔菲法构建护理专业学位研究生与肿瘤专科护士核心能力联合培养方案

目的:构建护理专业学位研究生与肿瘤专科护士核心能力联合培养方案,为推动我国护理专业学位研究生教育的发展提供参考。方法:通过文献分析法及半结构化访谈初步形成护理专业学位研究生与肿瘤专科护士核心能力联合培养方案条目池,制定专家函询问卷,并采取德尔菲专家函询法对15名专家进行专家函询,最终形成护理专业学位研究生与肿瘤专科护士核心能力联合培养方案。结果:3轮函询专家积极性系数均为100.0%,专家权威系数分别为0.838,0.880和0.880。经过咨询最终形成包括理论知识掌握能力、临床综合实践应用能力、组织管理能力、教学及科研能力、发展能力5个一级指标、17个二级指标、96个三级指标的护理专业学位研究生与肿瘤专科护士核心能力联合培养方案。结论:构建的护理专业学位研究生与肿瘤专科护士核心能力联合培养方案具有良好的可靠性与科学性,对肿瘤护理方向专科人才培养提供参考。

智能化测绘背景下测绘工程专业本硕博一体化人才培养模式的探索与实践

智能化测绘背景下的测绘工程专业承担着对接国家战略需要、加速学科转型升级、培养行业拔尖创新人才的重要任务。面对当前测绘类人才培养内容重复、周期较长的问题,本文以中国矿业大学测绘工程专业本硕博一体化培养模式为例,从构建一体化的课程体系、一体化的培养机制、一体化的实践创新平台和一体化的学生支持体系4个方面,深入探讨了如何培养具有国际视野、公益精神、创新意识、实践能力的智能化测绘拔尖创新人才。

基于D-S证据理论变压器绕组机械状态评估

提出了一种基于D-S证据理论的变压器绕组机械状态评估方法。以S11-M-500/35型变压器为实际样机,绕制正常及故障绕组,分别获取绕组不同状态下的特征信息,将信息进行量化和隶属度分配,分别组建电气参量子证据和振动参量子证据评估分量,最终通过D-S综合证据理论评估模型得到变压器本体状态评估结果。通过试验得出本方法能够准确评估各相绕组当前机械状态,从而验证了本方法的准确性及可行性。

职业师范院校职教师资本硕一体化:构建基础与路径选择

探讨了职业师范院校在培养职教师资方面的本硕一体化模式,旨在培养适应现代职业教育发展需求的复合型教师。深入分析职业教育的发展需求、大职业教育观念和层次结构,研究提出职教师资本硕一体化的培养路径,包括确定培养模式、明确培养目标、构建课程体系和优化实施策略。通过本硕一体化,旨在提升教师素质和能力,促进职业教育与社会经济发展的良性互动,满足新时代对高素质技术技能人才的需求。

S期激酶相关蛋白2、CD147及穿膜蛋白1在骨肉瘤中的表达及与疾病恶性程度及与疾病恶性程度、预后的关系

目的 分析S期激酶相关蛋白2(SKP2)、CD147及穿膜蛋白1(DLK1)在骨肉瘤中的表达及与疾病恶性程度和预后的关系。方法 检测103例骨肉瘤患者骨肉瘤组织与癌旁组织中SKP2、CD147及DLK1的表达情况,并分析SKP2、CD147及DLK1表达与骨肉瘤患者临床特征和预后的关系。结果 骨肉瘤组织中SKP2、CD147、DLK1阳性表达率均明显高于癌旁组织,差异均有统计学意义(P﹤0.01)。随着骨肉瘤患者临床分期逐渐增高,SKP2、CD147、DLK1阳性表达率均逐渐升高。血管扩张型骨肉瘤患者SKP2、CD147、DLK1阳性表达率均高于软骨母细胞型和骨母细胞型患者,软骨母细胞型骨肉瘤患者SKP2、CD147、DLK1阳性表达率均高于骨母细胞型患者,差异均有统计学意义(P﹤0.05)。预后良好与预后不良骨肉瘤患者肿瘤转移、肿瘤分型及SKP2、CD147、DLK1表达情况比较,差异均有统计学意义(P﹤0.01)。多元Logistic回归分析结果显示,SKP2、CD147、DLK1阳性表达及肿瘤转移均是骨肉瘤患者预后不良的独立危险因素(P﹤0.01)。结论 SKP2、CD147、DLK1在骨肉瘤中呈高表达,且对疾病恶性程度、预后有较大的评估价值,可进一步研究证实。