Three-Stage Six-Step Flue-Curing Technology for Viginia Tobacco Leaves and Its Application in China

In order to overcome the problem that the leaf yellowing stage in tobacco curing reduces the fragrance of the product, this study introduced the principle and key parameters of a three-stage six-step curing technology. The field trail was conducted in Wulong county of Chongqing city in 2010, and Virginia K326 was the tested cultivar. The middle leaves were harvested and plaited after maturity, and then cured with the three-stage six-step curing technology and traditional three-stage curing technology, respectively. Three replicates were established for each of the two curing technologies. Then, chemical constituents, aromatic substances and smoking quality were analyzed. The results show that compared with the traditional three-stage curing technology, the three-stage six-step curing technology produces more suitable ratios of chemical constituents, higher aromatic component content and higher smoking quality grade of tobacco leaves. Therefore, the continuous improvement of corollary equipment and matching technologies is expected to widen the applications of the three-stage six-step curing technology in tobacco and provide a strong technical support for the development of the tobacco industry.

Effects of Different Flue-curing Technologies on Microscopic Structure of Flue-cured Tobacco Leaves

[Objective] This study aimed to compare the effects of Chinese quality-improving fragrunce-increasing tobacco flue-curing technology, Chinese three- stage tobaeeo flue-curing technology and Zimbabwean tobaceo flue-euring technology on microscopie structure of flue-cured tobacco leaves to provide theoretical basis for tobacco flue-curing. [ Method ] Middle leaves of tobacco cultivar K326 were collected in Pengshui County of Chongqing City for flue-curing experiment using three flue-curing technologies. Leaf samples were collected regularly in the flue-curing process, to investigate the microscopic structure of flue-cured tobaceo leaves. [ Result] During three flue-curing processes, leaves, palisade tissues and sponge tissues shrank gradually. Three flue-euring processes exhibited significant differ- ences in the peak of tissue shrinkage ： microscopic structure of flue-cured tobacco leaves in Chinese three-stage tobacco flue-curing process shrank earliest, follower by Chinese quality-improving fragrance-increasing tobacco flue-curing process; flue-eured tobacco leaves in Zimbabwean tobacco flue-curing process presented the latest shrinkage. At 84 h post-curing, leaf thickness in three flue-curing processes showed a descend order of Chinese three-stage tobacco flue-curing process 〉 Chinese quality-improving fragrance-increasing tobacco flue-curing process 〉 Zimbabwean tobacco flue-curing process. Upper and lower epidermal cells in Zimb- abwean tobacco flue-curing process ruptured earlier than other two flue-curing processes; eventually, the majority of cells ruptured and mixed with palisade tissues and sponge tissues. In Chinese quality-improving fragranee-increasing tobacco flue-curing process, only a small number of epidermal cells in dried leaves ruptured. Among three flue-curing technologies, Zimbabwean tobacco flue-curing technology exhibited the greatest damage to epidermal cells, followed by Chinese three-stage tobaceo flue-curing technology; Chinese quality-improving fragrance-increasing tobacco flue-curing technology had the minimum damage to epidermal cells. Mese- phyll cross-section exhibited significant morphological changes in stomata. To be specific, at 0 - 12 h post-curing, stomata of tobacco leaves closed with slightly prominent stamatal apparatuses on upper and lower epidermis; at 24 -72 h post-curing, stomata of tobaceo leaves changed gradually from opening to closure with significantly prominent stomatal apparatuses on upper and lower epidermis; at 84 h post-curing, stomata of tobacco leaves closed, and the majority of stomatal appa- ratuses were significantly prominent. In Chinese quality-improving fragrance-increasing tobacco flue-curing process, only a small number of epidermal ceils ruptured at 84 h pest-flue-curing; palisade tissues and sponge tissues shrank almost simultaneously. Significant gaps were observed between palisade tissues and between pal- isade tissues and sponge tissues. Chinese quality-improving fragrance-increasing tobacco flue-curing technology exhibited lower disorder level compared with other two flue-curing technologies. [ Conclusion] Chinese quality-improving fragrance-increasing tobacco flue-curlng technology was conducive to maintaining the micro- scopic structure integrity of flue-cured tobacco leaves and obtaining high-quality flue-cured tobacco leaves.

Effects of Different Flue-curing Technologies on Submicroscopic Structure of Flue-cured Tobacco Leaves

[ Objective] This study aimed to compare the effects of low-temperature low-humidity tobacco flue-curing technology, moderate-temperature moderate- humidity tobacco flue-curing technology and moderate-temperature high-humidity tobacco flue-curing technology on submicroscopic structure of flue-cured tobacco leaves to provide theoretical basis for tobacco flue-curing. [ Method] Middle leaves of tobacco cuhivar K326 were collected in Pengshui County of Chongqing City for flue-curing experiment using three flue-curing technologies. Leaf samples were collected regularly in the flue-curing process, to investigate the submicroscopic structure of flue-cured tobacco leaves. [ Result] Morphology changes and structural rupture of chloroplasts occurred at different time during three flue-curing proces- ses. In low-temperature low-humidity flue-curing process, morphology changes and structural rupture of chloroplasts occurred late but rapidly; in moderate-tempera- ture moderate-humidity flue-curing process and moderate-temperature high-humidity flue-curing process, morphology changes and structural rupture of chloroplasts occurred early but slowly. Among these three flue-curing processes, the speed of changes in mitochondria morphology, cristae number and membrane rupture pres- ented an upward order of low-temperature low-humidity flue-curing process 〈 moderate-temperature high-humidity flue-curlng process 〈 moderate-temperature moderate-humidity flue-curing process. In low-temperature low-humldity flue-curing process, starch granules in chloroplasts ruptured after flue-curing for 36 -48 h ; in moderate-temperature moderate-humidity flue-curing process, starch granules in chloroplasts ruptured after flue-curing for 24 - 36 h; in moderate-temperature high-humidity flue-curing process, starch granules in chloroplasts ruptured after flue-curing for 12 - 24 h. [ Conclusion ] Using low-temperature low-humidity flue- curing technology could prolong the maintenance duration of the submicroscopic structure integrity of flue-cured tobacco leaves, which was conducive to fully decom- posing and transforming substances in tobacco leaves and obtaining high-quality flue-cured tobacco leaves.

Hydration evolution of pre-cast concrete with steam and water curing

The hydration characteristics of pre-cast concrete considering the effects of effective initial steam-curing and water-curing duration were measured and analyzed with XRD, TG, X-ray CT, SEM-BSE and MIP techniques. The results show that the effective initial steam-curing duration for pre-cast concrete with lower water-binder ratio was 10 14 h at 50 °C and the initial water-curing duration was 7 14 d. And the hydration evolution of cement, fly ash and slag in pre-cast concrete was obtained respectively by combining the hydrochlorides and EDTA selecting dissolution methods, based on which the contents of hydrated and anhydrate in concrete were calculated and the corresponding dynamic capillary porosity was also determined. Moreover, the comparison between calculated results and experimental ones indicates that the proposed evolution models of microscopic characteristics corresponding to hydration kinetics of cemented materials could be adopted to predict the developing trend of capillary porosity and hydration-products content in pre-cast concrete with fly ash and slag under certain curing conditions.

The Development Mechanism and the Technical Characteristics of the Modern Cutting Technology

The development mechanism and mode and the new technical characteristics of the modern cutting technology are studied and analyzed. It is presented that to speed up the development of cutting technology and fully use the good-quality technical resource of cutting tool have the significant meaning for construction of powerful manufacturing industry of China.

农业知识驱动服务技术革新综述与前沿

农业知识驱动服务技术是指运用先进信息技术,科学、高效调配农业领域专业知识服务资源,为农业行业提供智能化知识服务的技术,在解决农业技术服务供需严重失衡等难点问题方面具有重要意义,日益成为支撑农业转型升级和高质量发展的重要引擎,代表着核心研究方向,伴随着技术发展全过程。目前农业行业迫切需要解决的是知识供给严重不足、服务效率不高的问题。农业知识驱动服务技术经历较长时间发展,在知识高效匹配和精准供给方面取得了较大进步,特别是2022年11月以来ChatGPT这类技术的出现,充分展现了超大规模预训练模型在知识智能服务方面的巨大潜力,这也是农业知识驱动服务可以取得突破的关键所在,可以在这方面发挥重要作用。该文在分析农业知识驱动服务相关技术现状的基础上,展望了农业领域可行的知识驱动服务技术路径,预测农业领域知识服务大模型研发构建会呈现参数由少到多、算力由弱趋强、强化训练逐渐加深的特点得到快速发展应用,未来将在专业技术指导、农业“装备-信息-农艺”融合、农业信息系统平台服务总线等方面系统升级现有农业知识服务范式,多模态服务将得到系统融合加深,人机交互模式将向“人性化”方向进一步黏合增强,从而为农业智能化转型升级提供全新的技术支撑,引领农业知识服务从数据检索、语义匹配迈向生成式知识驱动模式转变。

改良热泵密集烤房烘烤工艺及其效果分析

为进一步利用热泵密集烤房优势,解决热泵密集烤房与现有工艺不匹配、初烤烟叶化学成分提升不明显等问题,对传统三段式烘烤工艺进行改良,对初烤烟叶的主要化学成分、石油醚提取物、多酚类物质、香气代谢产物及评吸质量进行分析。结果表明:与传统三段式烘烤工艺相比,可变频密集烤房采用改良三段式烘烤工艺后效果较好,其初烤烟叶化学成分赋值提高8.9%,淀粉含量下降20.0%,中性致香物质含量提高0.7%,多酚类物质含量提高49.4%,评吸得分提高6.2%。说明改良三段式烘烤工艺可促进烟叶香气代谢产物的积累和化学质量、评吸质量的提高。综合分析,改良后的三段式烘烤工艺能够有效提升热泵密集烤房初烤烟叶质量,有较好的实用价值。

强迫思维症状来访者心理干预个案体会

很多考生在大型考试前头脑中会控制不住的反复出现不相干的想法,影响注意力及心身状态,这是考前焦虑以及脑神经过度疲劳引起的强迫思维。本文通过联合运用森田疗法、认知行为疗法、意象对话技术、正念呼吸放松技术,对实际案例进行心理干预,有效改善来访者强迫思维症状,缓解考前焦虑。通过对咨询过程的呈现和分析,希望能将此方法、思路推广应用。

基于信息化平台的手术病人入院服务新模式的设计与应用

目的:基于信息化平台,优化手术病人入院服务新模式,并分析其实践效果。方法:选取2021年7月—12月我院服务模式创新前的2104例择期手术病人为对照组,2022年7月—12月应用入院服务新模式的2558例择期手术病人为观察组。对照组采用传统的手术病人入院流程,观察组采用基于信息化平台的手术病人入院服务新模式。比较两组手术病人住院时间、入院等待时间及手术等待时间。结果:观察组病人住院时间、入院等待时间、手术等待时间均明显短于对照组,病人满意度明显高于对照组(P<0.05)。结论:基于信息化平台的手术病人入院服务新模式搭建了门诊与住院部的桥梁,减少了手术病人住院时间,降低了住院费用,提高了医院绩效,促进了医院高质量发展。

微柱凝胶技术与凝聚胺技术在ABO新生儿溶血病输血前检测中应用对比

目的对比分析微柱凝胶技术与凝聚胺技术在ABO新生儿溶血病输血前检测中的应用。方法将郑州市第一人民医院2020年1月至2023年5月ABO新生儿溶血病患儿(88例)作为研究对象,依据区间随机法将其分为对照组、研究组,各纳入44例,对照组行输血治疗前开展凝聚胺技术检验血型配血,研究组输血治疗前开展微柱凝胶技术检验血型配血。比较两组检验符合率、一次性交叉配血成功率。结果研究组正定型、反定型符合率(100.00%、100.00%)均高于对照组(86.36%、86.36%),两组差异有统计学意义(P<0.05);研究组交叉配血成功率(100.00%)高于对照组(86.36%),两组差异有统计学意义(P<0.05)。结论对比凝聚胺技术,微柱凝胶技术在ABO新生儿溶血病输血前检测中的应用价值更高,有利于提升输血安全,值得应用。

谷类作物样品前处理技术研究进展

综述了谷类作物样品的前处理技术的研究进展并展望了其发展趋势,以期为我国食品安全监管提供支持。

职前教师教育技术能力框架、发展目标与预测模型

为使教师教育技术能力培养和培训达到“需要”与“可能”的统一,遵循教师教育一体化理念,首先对教师发展全过程进行了理性把握和综合考量,设计了包含意识与责任、知识与技能、设计与开发、应用与评价、科研与发展5个一级维度指标,以及15个二级维度指标的教师教育技术能力框架;其次考虑到职前培养是教师教育最为关键和基础的阶段,故以职前培养这一阶段为突破口,依据能力框架制定了职前教师教育技术能力发展目标,并参照此目标,采用G2法确定了能力框架的指标权值;最后借助BP神经网络建立了职前教师教育技术能力预测模型,探讨了职前教师的教育技术能力与其影响因素之间的关系,为预测与评估职前教师的教育技术能力提供了科学有效的方法。

预训练大语言模型发展对中国数字创意产业的启示

预训练大语言模型与数字创意产业的结合,一方面可以促进预训练大语言模型技术研发和应用,推动自然语言处理相关产业发展,另一方面也可以为数字创意产业提供更高效、精准的解决方案,促进产业数字化转型升级。然而,目前中国预训练大语言模型在数字创意产业的运用主要侧重于文本识别生成和语音生成等领域。为此,通过阐述预训练大语言模型以及中国数字创意产业的发展现状,梳理预训练大语言模型在数字创意产业的应用范畴和商业布局,综合分析作为新质生产力引擎的预训练大语言模型在中国数字创意产业发展中的机遇与挑战,并为中国数字创意产业的发展提出建议。研究发现:融合发展是中国数字创意产业的重要趋势,网络文学、动漫游戏、短视频等细分产业开始发展出完整的产业链条;预训练大语言模型可提升数字创意产业的内容生成效率、丰富艺术创意、拓展数字娱乐形式,也可以加强社交媒体分析监测、提高跨语言应用的效率、辅助科研教育,带来提升数字创意产业的智能化水平、增强用户黏性、数字创意生产者身份多元化等机遇,但同时也面临数据成本、隐私安全、知识产权等问题。提出未来在预训练大语言模型应用于数字创意产业的发展中,重视构建相关监管评估框架和知识产权保护体系,提升多模态技术水平,强化智能算力体系建设,以推动数字创意产业的智能化发展。

数字技术赋能学前教育高质量发展的现实困境与路径取向

数字技术重塑学前教育的模式和方式,已然成为引领学前教育变革和高质量发展的关键力量。新发展阶段,数字技术赋能学前教育高质量发展的现实困境主要有:学前教育数字鸿沟被忽视、学前高质量资源建设“有路无车”、幼儿园教师数字素养评价缺位和高质量家园协同育人浮于表面。因此,文本认为数字赋能学前教育高质量发展的路径取向有以下四点:多管齐下,消除数字鸿沟;多措并举,保障优质教育资源供给;多方发力,提升学前教师数字素养;多方联动,构建互联互通和协同共育的家园无缝合作机制。

预处理对TiB_(2)增强铝基复合材料电弧增材影响

以TiB_(2)/6056铝基复合材料丝材为焊材,采用冷金属过渡焊接技术,研究TiB_(2)增强铝基复合材料丝材的电弧增材,重点分析预热处理对增材层成形及接头质量的影响。结果表明:当焊接电流为140 A、送丝速度为8 m/min、焊接速度为5 mm/s、基板预热温度为200℃时制备的增材层与基板未预热制备的增材层相比,外观成形更好,气孔数目降低,气孔尺寸减小,晶粒更细小,TiB_(2)颗粒分散更好,且增材层硬度与拉伸性能均得到了提高。

托顶煤巷道易片冒顶板变形机理与超前导管预注浆控制技术研究

目的 为探究厚煤层易片冒区域托顶煤巷道顶板变形破坏机理,并对易片冒区托顶煤巷道顶板进行有效控制,方法 以常村煤矿2701工作面皮带运输巷为例,通过等截面梁理论分析托顶煤巷道顶板破断成因,研究托顶煤巷道顶板的稳定性与巷道宽度和顶煤强度的关系。通过极限平衡准则得到巷帮位移的计算公式,证明托顶煤巷道具有帮顶协同变形机制。建立托顶煤巷道数值模型,研究巷道埋深、侧压系数、顶煤厚度和顶煤强度与托顶煤巷道围岩稳定性的关系。结果 结果表明:巷道埋深越大,其对托顶煤巷道两帮稳定性的影响越大;侧压系数的增加对巷道两帮和底鼓量的影响更大,对顶板影响较小;顶板下沉量与顶煤厚度呈正相关,底鼓量则与顶煤厚度呈负相关;顶煤强度的增加使巷道顶板下沉量与两帮移近量均近似呈线性减小趋势,底鼓量基本保持不变。结论 通过幂律型流体柱形渗透注浆扩散理论得到超前导管注浆半径,由此提出托顶煤巷道超前导管预注浆帮顶联合控制技术,成功控制易片冒托顶煤巷道顶板冒落问题,可为类似地质条件的托顶煤巷道顶板控制提供借鉴。

职前教师现代教育技术应用课程融合创新的探索

虽然现代教育技术应用课程从注重技术知识传授转向注重TPACK知识传授,但并未取得成功,主要原因是忽视了技术知识的基础作用。课程需要转向融合创新,实现技术知识与TPACK知识协同发展。通过融合多种教学理念的创新,融合目标、内容与学习结果的创新,融合“互联网+”策略的创新,融合学习成果应用的激励机制的创新,构建了融合创新的课程框架。实践表明,这一融合创新的课程框架能够在夯实学生技术知识的基础上发展学生的TPACK知识。

基于微信小程序的SCN人脸表情识别系统设计

针对人脸表情识别技术,利用自修复网络(Self-Cure Network,SCN)人脸表情识别算法模型的优势,实现SCN在移动端设备上的应用,利用训练好的模型构建人脸表情识别系统,以微信小程序为系统平台,开发了一款表情识别微信小程序。经过系统测试,结果表明该系统表情识别准确率高、操作方便、运行流畅、功能完备,基于微信小程序的SCN人脸表情识别系统具有广泛的应用前景。

ChatGPT对科技期刊的影响及对策初探

聊天机器人模型ChatGPT自2022年11月30日发布以来,仅仅数月就已开始对科技期刊产生影响,并引发了科研伦理方面的争议。通过检索作者署名中包含ChatGPT或采用ChatGPT辅助写作的文献,观察了ChatGPT介入科技期刊出版的现状及影响,同时收集整理了知名出版商、预印本平台及相关机构对ChatGPT等人工智能(AI)工具参与论文写作的反应和对策,为国内科技期刊积极采取措施应对AI技术冲击、动态调整编辑出版策略提供借鉴。

沁水盆地南部郑庄区块中北部煤层气直井增产新技术研究与应用

为提高沁水盆地郑庄区块中北部煤层气直井产量,基于研究区评价井地应力测试资料、压裂裂缝监测资料,分析了研究区直井增产效果差的原因,提出了针对性增产技术,开展了现场对比试验,并对结果进行了分析,结果表明郑庄中北部直井产量低、措施增产效果差的主因为:①研究区以垂直裂缝为主、压裂缝长较短,且随着埋深增加,相同压裂规模形成的裂缝尺寸减小;②随着埋深增加,支撑剂嵌入深度增加,裂缝闭合加快,导致稳产时间短,产气曲线主体形态为“单峰型”;③经初次压裂后煤体结构更加破碎,新裂缝容易进入初次压裂裂缝,造新缝难度增加。针对上述原因,创新提出的充填预堵+大规模压裂+远端支撑增产技术,“充填预堵”即先采用相对较低的排量、砂比、规模充填初次压裂裂缝,然后再进行大规模重复压裂,实现堵老缝、造新缝。“大规模”压裂即大排量、大液量、高砂比压裂,将压裂液量由600~800 m^(3)提高至1300~2000 m^(3)以上,增加改造体积;将排量由6~8 m^(3)/min提高至10~14 m^(3)/min以上,增加裂缝长度和携砂性能;采用低黏压裂液体系配合低密度支撑剂,将砂比由7%~8%提高至10%~15%以上,提高铺砂强度,降低裂缝闭合程度。“远端支撑”即采用自悬浮支撑剂与大排量相结合,增长支撑剂运移距离,提高支撑裂缝比例。充填预堵+大规模压裂+远端支撑增产技术实施后平均单井日产量达到1380 m^(3),比措施前增产1190 m^(3),比邻井稳产气量增加近1000 m^(3),实现了郑庄中北部中深储层连片低产区直井产量突破。现场对比试验表明:实施“充填预堵”后再进行大规模压裂,平均净施工压力比初次压裂增加了3.3 MPa,形成了新裂缝,比直接进行大规模压裂增量提高1000 m^(3)。总体上,充填预堵+大规模压裂+远端支撑增产技术关键参数数值越大,增产效果越好。