Accurate models and nutritional strategies for specific oxidative stress factors: Does the dose matter in swine production?

Oxidative stress has been associated with a number of physiological problems in swine,including reduced production efficiency.Recently,although there has been increased research into regulatory mechanisms and antioxidant strategies in relation to oxidative stress-induced pig production,it remains so far largely unsuccessful to develop accurate models and nutritional strategies for specific oxidative stress factors.Here,we discuss the dose and dose intensity of the causes of oxidative stress involving physiological,environmental and dietary factors,recent research models and the antioxidant strategies to provide theoretical guidance for future oxidative stress research in swine.

Integrated high-performance and accurate shaping technology of low-cost powder metallurgy titanium alloys: A comprehensive review

The practical engineering applications of powder metallurgy (PM) Ti alloys produced through cold compaction and pressure-less sintering are impeded by poor sintering densification, embrittlement caused by excessive O impurities, and severe sintering deforma-tion resulting from the use of heterogeneous powder mixtures. This review presents a summary of our previous work on addressing the above challenges. Initially, we proposed a novel strategy using reaction-induced liquid phases to enhance sintering densification. Near- complete density (relative density exceeding 99%) was achieved by applying the above strategy and newly developed sintering aids. By focusing on the O-induced embrittlement issue, we determined the onset dissolution temperature of oxide films in the Ti matrix. On the basis of this finding, we established a design criterion for effective O scavengers that require reaction with oxide films before their dissol-ution. Consequently, a ductile PM Ti alloy was successfully obtained by introducing 0.3wt% NdB6 as the O scavenger. Lastly, a powder- coating strategy was adopted to address the sintering deformation issue. The ultrafine size and shell-like distribution characteristics of coating particles ensured rapid dissolution and homogeneity in the Ti matrix, thereby facilitating linear shrinkage during sintering. As a result, geometrically complex Ti alloy parts with high dimensional accuracy were fabricated by using the coated powder. Our fundament-al findings and related technical achievements enabled the development of an integrated production technology for the high-performance and accurate shaping of low-cost PM Ti alloys. Additionally, the primary engineering applications and progress in the industrialization practice of our developed technology are introduced in this review.

New finite strain elastoplastic equations for accurately and explicitly simulating pseudoelastic-to-plastic transition effects of shape memory alloys

A new finite strain elatoplastic J2-flow model with coupling effects of both isotropic and anisotropic hardening is proposed with the co-rotational logarithmic rate.In terms of certain single-variable shape functions representing uniaxial loading and unloading curves,explicit multi-axial expressions for the three hardening quantities incorporated in the new model proposed are derived in unified forms for the purpose of automatically and accurately simulating complex pseudoelastic-to-plastic transition effects of shape memory alloys(SMAs)under multiple loading-unloading cycles.Numerical examples show that with only a single parameter of direct physical meaning for each cycle,accurate and explicit simulations may be achieved for extensive data from multiple cycle tests.

Accurate measurement and influence on device reliability of defect density of a light-emitting diode

A method of accurately measuring the defect density of a high-power light-emitting diode （LED） is proposed. The method is based on measuring the number of emitting photons in the magnitude of 105 under the injection current as weak as nA and calculating the non-radiative recombination coefficient which is related to defect density. Defect density is obtained with the self-developed measurement system, and it is demonstrated that defect density has an important influence on LED optical properties like luminous flux and internal quantum efficiency （IQE）. At the same time, a batch of GaN-based LEDs with the chip size of 1 minx 1 mm are selected to conduct the accelerated aging tests lasting for 1000 hours. The results show that defect density exhibits a greater variation and is more sensitive to LED reliability than luminous flux during aging tests. Based on these results, it is concluded that for the GaN-based LED with a chip size of 1 mm ~ I mm, if its defect density is over 1017/cm3, the LED device performance suffers a serious deterioration, and finally fails.

The Study Dynamics of Accurately Targeted Poverty Alleviation

The accurately targeted poverty alleviation has gradually become one of the important research directions in the field of poverty research. The existing foreign and domestic studies concerning about the accurately targeted poverty alleviation are few and mainly focus on the aspects such as poverty object recognition, target for poverty alleviation, and fund embarking; a complete system has not yet been formed for the relevant studies. On the basis of analyzing and reviewing relevant studies on the accurately targeted poverty alleviation at home and abroad, a further research direction for the accurately targeted poverty alleviation is proposed in this paper.

Why Is an Integral an Accurate Value?

The derivative and integral in calculus are both exact values. To explain this reason, the integration interval can be infinitely subdivided. The difference in area between curved trapezoids and rectangles can be explained by the theory of higher-order infinitesimal, leading to the conclusion that the difference between the two is an infinitesimal value. From this, it can be inferred that the result obtained by integration is indeed an accurate value.

Theory and Practice of High-Level Sprint Training Based on Accurate Sectional Timing

There is an obvious gap in sprint level at home and abroad,and there are different opinions on the reasons.According to the analysis,physical energy and its distribution in each segment are the main factors restricting the sprint performance in China.Different from middle and long-distance running,we must rely on accurate sectional timing technology to master the law of speed-physical energy change in the process of sprint.Each stage is an integral part of the whole dash process,and each part restricts each other.Each stage has a relative best achievement.Simply pursuing the optimal state of segment is not only not helpful to the final result,but also counterproductive.

设施黄瓜主要病害发生及综合防控

从病害发生特点、为害症状、侵染循环、流行因素及防控技术等方面对我国设施黄瓜主要病害发生情况及其综合防控技术进行总结、分析和展望,以期为黄瓜主要病害监测和防控技术研究提供参考。

面向教师画像的能力精准测评和可视化呈现

在人工智能助推教师队伍建设背景下,借助画像技术实现对教师能力的精准测评并助力其个性化发展,愈发重要。然而,面向教师画像的能力测评精准性仍有待提高,其可视化呈现方式的解释性也仍显不足。研究根据教师能力的构成特征及多模态数据测评文献分析,构建了全面细粒度的面向教师画像的能力测评框架,并从数据多源采集及其准确处理的角度,提出了有效场景信息识别、数据采集高支持度保障、跨场景数据动态融合、非线性特征提取算法优化等四方面的测评精准性提升策略。结合自主研发的师范生教学基本技能智能实训系统,研究分析了教师画像的数据可视化特征,探讨了能力外显的行为、社会交互、知识、情感等四类数据属性的可视化方式。

Accurate Evaluation of China's Human Rights Legislation During the Historical Periods Before and After Reform and Opening-up

Recently, when evaluating the achievements China has made during the his- torical periods before and after reform and opening-up, Chinese President Xi Jinping pointed out, ＂The socialist construction conducted by the people under the leadership of our Party is divided into two historical periods--before and after reform and opening-up. The two periods are in- terconnected, but also different from each other. However, they both essen- tially reflect the practical explorations of socialist construction conducted by the people under the leadership of the Party. Socialism with Chinese characteristics began to take shape in the new era of reform and opening- up, but it is also grounded in New China＇s 20-plus years of experience in building and carrying out the basic system of socialism... Although the two historical periods have huge dif- ferences in the guidelines, policies,

基于四行精密播种的玉米直播机设计与试验

为了解决播种玉米种子精度低的问题,设计了一款基于四行精密播种的玉米直播机,可实现玉米种子快速、精准播种。试验表明:该玉米直播机移动性能好、播种速度快、种植深度和每穴种子数量更加准确,封土情况也大幅改善,符合设计需求,具有较高的可靠性和可行性。

井工煤矿甲烷排放精准监测与核算

甲烷作为全球第二大温室气体,具有增温潜势高、寿命短的特点,主要来源于煤炭、油气生产、农业、畜牧业和废弃物处理等领域。积极稳妥有序控制甲烷排放,兼具减缓全球温升的气候效益、能源资源化利用的经济效益、协同控制污染物的环境效益和减少生产事故的安全效益。甲烷也是煤矿生产排放中最主要的温室气体,目前对煤矿甲烷的排放监测及其在煤矿三维立体空间内的浓度分布研究将成为我国甲烷排放控制行动的重点,对煤矿企业更好顺应国家战略具有重要意义。选取山西某高瓦斯矿井、陕西某低瓦斯矿井进行甲烷排放监测核算,以固定监测、手工监测、无人机监测及矿后活动监测等方式研究我国高低瓦斯矿井甲烷分布,并对其甲烷排放量开展分析。结果表明:①美国Climate TRACE网站公布的山西某高瓦斯矿井、陕西某低瓦斯矿井2022年度甲烷排放量与实测法计算的结果差异较大,其中公布的某低瓦斯矿井年度甲烷排放量为实测法计算结果的10.92倍,自上而下的监测核算方法准确性不足,无法为碳交易提供可靠的数据支持。②矿后活动监测核算发现,采用IPCC缺省值计算的矿后活动甲烷排放量是实测法计算的3~5倍,且不同粒径和暴露时间下煤样反馈的矿后活动排放量差异较大。亟需一套统一精准的测试标准,为未来碳市场交易提供公平准确的数据。

我国植物油料油脂加工技术新进展

植物油料油脂加工的主要内容包括油脂及蛋白的初加工和深加工技术、综合利用技术、工程装备技术及品质控制技术等,概述了我国植物油料油脂加工技术新进展。我国已初步建立起基于营养和安全为评价标准的食用植物油精准适度加工体系;突破了零反式脂肪酸专用油脂生产技术,能满足各种食品加工场景需求;功能油脂制备技术成果渐次落地,推动产业进入蓬勃发展期,多款结构脂产品进入量产,跨国公司垄断局面得以改变;新油源开发方兴未艾;植物蛋白结构功效关系基础研究促进了植物基产品开发;油料油脂综合利用规模扩大;食用油安全防控技术、绿色储油技术研究不断深入;大型浸出器和浓缩蛋白制取装备的设计和制造水平达到国际先进水平;智能化工厂建设支撑我国油料油脂加工各项经济技术指标处于世界领先地位。

医药类高校图书馆精准化学科服务发展现状及服务模式研究

文章采用文献调研法和网络调研法,从部门和人员设置、基础服务、科研支持服务、管理与决策支持服务等角度,对2022年软科医科类大学排名前30的高校图书馆学科服务现状进行调研。针对调研中发现的问题,构建基于数据驱动的全景式精准化学科服务模式,以期为医药类高校图书馆学科服务的发展提供参考。

大学生慢就业现象的影响因素与应对策略研究

近年来,大学生慢就业现象比较常见,引起社会广泛关注。为科学评价大学生慢就业现象,合理引导高校毕业生就业,选取河北省5所高校2023年应届毕业生为调研对象,开发测评量表,编制设计调查问卷,构建大学生慢就业影响因素测评体系,对其就业能力、就业准备、职业规划、就业观念、就业压力等影响因素进行定量评价,探索应对大学生慢就业现象的策略。大学生就业率是衡量高校教学质量与就业情况的重要指标,也是经济社会发展的重要保障,为此高校应紧跟社会需求,优化人才培养方案,提升人才培养素质;毕业生自身也应摆正就业心态,积极做好就业准备与职业规划;毕业生家庭也应改变择业观,尊重子女的就业选择,协助其做好职业发展规划,帮助其进一步明确人生目标。

甘肃地区遗传代谢病疾病谱及致病基因分析

目的对甘肃地区新生儿遗传代谢病(inherited metabolic disorder,IMD)的疾病谱和致病基因变异进行分析。方法回顾性分析2018年1月—2021年12月甘肃省妇幼保健院286682例新生儿IMD筛查的串联质谱数据,对串联质谱初筛及复查阳性的患儿进行基因分析。结果286682例新生儿中共发现28个致病基因导致的23种IMD,IMD总患病率为0.63‰(1/1593),其中苯丙酮尿症患病率最高(0.32‰,1/3083),其次为甲基丙二酸血症(0.11‰,1/8959)及四氢生物蝶呤缺乏症(0.06‰,1/15927)。在28个致病基因中共鉴定出166种变异,其中9个基因中存在13种新变异。根据美国医学遗传学与基因组学学会指南,5种新变异为致病变异,7种为可能致病变异,1种为临床意义未明。结论该研究丰富了IMD相关致病基因变异数据库,为该地区IMD精准筛查与诊断体系的建立提供基础性数据。

一种高密度织物的织物密度测试方法研究

对织物密度的定义和测试方法进行了简要阐述。针对高密度织物的织物密度,采用现有标准检测方法分辨困难而导致的检测难度较大的问题,提出一种全新的检测方法——显微镜法。该方法可以降低检测的错误率,提高检测效率,并且可以利用现有实验室设备完成检测,无需增加额外的仪器成本。

CT引导下肺小结节序贯穿刺、双针提插活组织检查

目的探索肺结节序贯穿刺模式、双针提插活检方式的临床应用价值。方法纳入2020年3月至2023年2月收治的孤立性肺结节患者57例。采用序贯穿刺模式和双针提插方式对肺结节进行穿刺和活组织检查。记录同轴针退针率、脱靶率、靶周率、靶心率,活检组织条长度和肺结节活检成功率,以及并发症。结果57例患者中,肺结节穿刺退针2例(3.5%)。针尖与肺结节空间位置:靶心52例(91.2%),靶周5例(8.8%),脱靶0例。切割槽内活检组织条长度:等于靶结节直径42例(73.7%),≥靶结节半径11例(19.3%),<靶结节半径4例(%),组织条缺如0例。肺结节活检成功57例(100%)。并发症:气胸12例(21.1%),肺针道出血10例(17.5%),活检区出血14例(24.6%)。结论受内应力影响,现行同步穿刺模式和活检方式不是理想的肺结节穿刺模式和活检方式。针尾挂线方法可消除内应力影响,序贯穿刺模式可增加肺结节穿刺精度,双针提插法可提高活检成功率,并发症发生率在可接受范围。

微波针挂线辅助肺结节精准穿刺效果及影响因素

目的探讨挂线法辅助微波针肺结节精准穿刺方法,分析术中影响穿刺结果的若干现象。方法收集107例恶性孤立性肺结节患者临床资料,其中原发性86例,转移性21例。肺结节CT轴状位长径平均(13.6±6)mm。采用挂线法辅助微波针肺结节穿刺。术中无退针,且插入结节中心区域为穿刺成功。记录并分析肺结节穿刺成功率、穿刺并发症和影响穿刺结果的针体裹挟、针体滑脱、针尖推顶、肺结节坠积、结节径向形变、结节掩蔽和针尖径向调针距离等若干现象发生率。结果穿刺成功101例(94.4%),失败6例(5.6%)。气胸23例(21.5%),肺内出血19例(17.8%)。发生针体裹挟9例(8.4%),平均裹挟距离1.2±0.5 cm;针体滑脱6例(5.6%),平均针尖移动距离0.8±0.3 cm;针尖推顶19例(17.8%),平均推顶距离1.6±0.7 cm;肺结节坠积15例(14.0%),平均移动距离0.9±0.5 cm;结节径向形变14例(13.1%),平均牵拉长度增加0.5±0.3 cm;结节掩蔽5例(4.7%);针尖径向平均调针距离0.7±0.4 cm。结论挂线法辅助微波针肺结节穿刺精度较高。术中应注意并处理影响穿刺结果的现象。

论人工智能时代大学生精准思政运行机制的构建

人工智能时代的到来为大学生精准思政的有效实施带来了重要机遇。但是有效推进人工智能时代大学生精准思政,需要厘清人工智能时代大学生精准思政系统的构成要素,在此基础上,再积极构建精准思政的运行机制,即问题导向机制、数据采集机制、决策分析机制、协同育人机制、评价反馈机制、正向激励机制、系统优化机制等。这有利于为大学生精准思政提供规范的制度保障,不断生成强大的内在驱动力,最终促进人工智能时代大学生精准思政提质增效。