Kinematics ofmandibular advancement devices(MADs):Why do some MADs move the lower jaw backward duringmouth opening?

Mandibular advancement devices(MADs)are widely used treatments for obstructive sleep apnea.MADs function by advancing the lower jaw to open the upper airway.To increase patient comfort,most patients allow the mouth to be opened.However,not all systems maintain the lower jaw in a forward position during mouth opening,which results in the production of a retrusion that favors the collapse of the upper airway.Furthermore,the kinematic behavior of the mechanism formed by the mandible-device assembly depends on jaw morphology.This means that,during mouth opening,some devices cause lower jaw protrusion in some patients,but cause its retraction in others.In this study,we report the behavior of well-known devices currently on themarket.To do so,we developed a kinematic model of the lower jawdevice assembly.Thismodelwas validated for all devices analyzed using a high-resolution camera system.Our results show that some of the devices analyzed here did not produce the correct behavior during patient mouth opening.

Adaptability of bipedicled scalp advancement flap for coverage of huge scalp defects after tumor resection

Background:Several reconstructive techniques have been used to reconstruct scalp defects.Numerous researchers have studied the utilization of bipedicled scalp advancement flaps for scalp defect coverage.In this study,we will assess the adaptability of a bipedicled scalp advancement flap for coverage of huge scalp defects after tumor resection.Methods:This study was performed at the Plastic Surgery Department,Fayoum University Hospital,on 20 patients with huge scalp tumors treated by adequate excision and reconstructed using a bipedicled scalp advancement flap from December 2021 to July 2023.Results:The study was conducted on 20 patients:16(80%)were men and 4(20%)were women presenting with large scalp tumors.The mean age was 57.4 years(33-68 years).The sites of the tumors were 10(50%)occipital,6(30%)parietal,and 4(20%)parieto-occipital.No major complications occurred postoperatively,and the bipedicled flaps survived well in all cases,with no necrosis.Conclusion:Huge scalp defects after tumor resection can be safely reconstructed with a large versatile bipedicled advancement scalp flap,either transversely or longitudinally oriented,with favorable functional results and accepted aesthetic results,apart from the alopecic area over the grafted donor site,which can be treated by tissue expansion if desired later.

China committed to global advancement of new technology in navigation

The recent 2024 World Conference of the International Federation of Navigation in Beijing focused on the expansion of navigation applications.Hosted by the China Navigation Society,the event aimed to explore the integration of navigation,communication,and remote sensing technologies.The head of the International Cooperation Department of the Ministry of Transport emphasized China’s commitment to promoting innovation in navigation.China has become the nation with the largest shipping infrastructure,the highest volume of goods transported by sea,and one of the largest fleets globally.

How do advancements in technology affect the development and use of textile binders?

The textile industry is constantly evolving,and advancements in technology are playing a pivotal role in shaping the development and use of textile binders.According to Reports and Insights,the global textile binder market is expected to reach a value of USD 5.33 billion by 2032,exhibiting a healthy CAGR of 4.4%.This growth is fueled by a confluence of factors,with technological innovation at the forefront.Let's delve into how these advancements are impacting the landscape of textile binders。

Humanomics Creates New Form of Human Advancement in China

Humanomics in the new era,a development format generated and developed from Chinese modernisation practice,created a new form of human advancement and inspired the cause of human progress,said a report released by Xinhua News Agency on 3 December 2023.

The Advancements of Medical Textiles:A Patent Perspective

The healthcare sector is advancing in many aspects,including smart devices,surgical robots,AR/VR consultation,etc.Medical textiles are one such aspect where we have observed tremendous growth in innovation.Before the pandemic,the CAGR of patent filing in medical textiles was~12.5%.Postpandemic,it increased to 42.6%.From the patent publishing data,we saw that the US,Japan,India,and Germany are the top four countries in which innovations in medical textiles are on the rise.The extent of the growth is due to the constant improvements and innovations in both textile technology and medical materials.

Efficacy of invisible advancement correction for mandibular retraction in adolescents based on Pancherz analysis

BACKGROUND Mandibular retraction is the main etiological mechanism of class II malocclusion in China and the subsequent distal molar relationship can cause functional discomfort in mastication,breathing and the temporomandibular joint.The use of mandibular advancement(MA)devices has recently emerged as an adolescent mandibular retraction treatment;however,current studies regarding the effect thereof are relatively few,and there is lack of sufficient clinical support.AIM To investigate the clinical effect of invisalign MA on the treatment of mandibular retraction in adolescents.METHODS This study included 30 adolescent patients who underwent treatment with the MA appliances from December 2017 to June 2021.The lateral cephalometric data before and after treatment were collected and imported into Dolphin Imaging software.The changes were measured by linear measurement superimposed with lateral cephalometric trajectory based on the Pancherz technology.RESULTS There was no significant difference in the length and position of maxilla before and after the treatment.The position of the mandible moved 3.13 mm,the length increased 4.14 mm,the mandibular ramus length increased 4.09 mm,the body length increased 4.25 mm,and the position of the condyle moved 1.03 mm forward after treatment.Additionally,changes in the incisor sagittal position and labial inclination were observed.The position of the upper incisor point moved back 1.33 mm,without statistical difference,the inclination and tooth angle decreased by 3.44°and 4.06°,respectively;the position of the lower incisor point was moved 2.98 mm,and the inclination and tooth angle increased by 2.62°and 1.23°,respectively.Furthermore,changes in the incisor overjet and molar relationship were seen.Overjet decreased by 4.31 mm,of which 1.78 mm was due to dental factors,accounting for 41.3%of the effect as opposed to 58.7%due to skeletal factors.Molar relationship improved 3.87 mm,with 1.34 mm due to dental factors,and dental and skeletal factors were accounted for 34.6%and 65.4%of the effect,respectively.CONCLUSION For adolescent patients with mandible retraction,invisalign MA can effectively promote the mandible growth,and it was proven to be mainly due to skeletal effects.

Revolutionizing patient care:the latest advancements in clinical pharmacy practice

The world of healthcare is constantly evolving,and one area that has seen significant advancements in recent years is clinical pharmacy practice.1 In the past,pharmacists were mainly responsible for dispensing medications and ensuring that patients understood how to use them safely.However,the role of clinical pharmacists has expanded significantly in recent years,and they now play a critical role in optimizing medication regimens,providing personalized patient counselling,and collaborating with other healthcare professionals to improve patient outcomes.2-3 In the extension of the role of the clinical pharmacist,nowadays health economics is also added,which includes cost-benefit analysis,cost-effectiveness analysis,cost-utilization analysis and costminimization analysis,which will ultimately help the policy and decision makers to make the cost of the drugs affordable,so that all the patient population can avail the benefits.

Penchang Village's Two-Fold Advancement

Panam County of Shigatse City in the Xizang Autonomous Region enjoys the honor of being known as the"hometown of vegetables and fruits"on the plateau.Since the 1990s,with the full support of Shandong Province,it has entered the produce industry and has been able to shed its label as a nationally recognized impoverished county.

A Broad Vision For Global Advancement

Ten years ago,Chinese President Xi Jinping unveiled an economic and infrastructure blueprint to promote connectivity and boost trade and development.To date,the Belt and Road Initiative(BRI)has transformed and improved the lives of millions of people across more than 150 participating countries worldwide.

条带状铁建造的原始矿物组成:进展与问题

原生矿物信息作为前寒武纪条带状铁建造(BIF)研究的最基本命题,是研究BIF成矿规律及其早期地球环境效应的基础。长期以来,将低级变质且保存部分原始矿物及沉积结构的BIF作为研究对象,进而追踪BIF的原始矿物组成与后期演变过程一直是科学家们关心的关键问题。目前,关于BIF原始矿物组成主要有三种认识:三价铁的氢氧化物、铁硅酸盐(成分类似于铁蛇纹石和黑硬绿泥石)和绿锈。其中,绿锈为含二价和三价铁的过渡态化合物,仅可见于局部缺氧环境。由于绿锈的亚稳态性质,对于其在类似于前寒武纪的富硅海洋条件下转变成何种矿物及相关转变的具体途径仍不清楚。因而,当前关于原始铁质矿物的争议主要存在于三价铁的氢氧化物和铁硅酸盐之间,由此引发的对BIF成矿理论及其对古环境指示意义的理解也存在较大分歧。本文系统回顾和评述了近年来BIF原始矿物组成研究的重要进展;在此基础上,认为三价铁的氢氧化物应是BIF最为主要的原始矿物,其次为铁硅酸盐矿物,二者可能在地质历史时间和空间分布上具有差异性。然而,支持铁硅酸盐原始成因的现有证据主要为经典的岩相学特征,急需更多元素和同位素地球化学等方面的佐证。BIF中现有铁质矿物组合应是原始沉淀物在成岩-变质作用条件下发生转变的产物,相较于成岩早期的菱铁矿,磁铁矿可能形成时间偏晚,究竟是生物-有机质成因抑或是菱铁矿的热化学分解成因亟待深入探讨。在此背景下,同时考虑到华北作为国际上BIF的重要产区,且发育不同变质级别的太古宙末期BIF,可能完整记录了BIF的全部历程。因此,可立足于华北,在已有的初步工作基础上,深度挖掘,力图为BIF矿物成因演变规律提供进一步约束,极大深化和推动我国BIF的成因研究。

意向性牙再植术保留重度牙周炎患牙的临床应用策略

随着牙周组织再生技术的发展与进步,越来越多的学者报道可通过意向性牙再植术治疗重度牙周炎患牙。对于已经具备拔牙指征的重度牙周炎患牙,意向性牙再植术已经成为保存天然牙最后的可能手段。然而意向性牙再植术的适应证要求严格,手术能否成功与病例的选择和医生的操作技能密不可分。本文探讨意向性牙再植术治疗重度牙周炎患牙的适应证和操作步骤,并结合文献和病例分析影响重度牙周炎患牙意向性牙再植术预后的相关因素,为临床医生了解和掌握该项手术技术提供参考。

不同推进比下螺旋桩在砂土中安装力的离散元研究

螺旋桩作为一种颇具潜力的海上风电基础形式,其安装问题是螺旋桩能否成功应用在海上风电工程中的关键。基于离散元方法,采用PFC^(3D)模拟分析了螺旋桩在不同推进比下安装时的桩身受力情况以及对周围土体的影响。宏观上,研究了螺旋桩在不同推进比下安装时螺旋桩连杆侧壁、连杆端部、螺旋叶片上下表面的受力变化规律;微观上,分析了螺旋桩安装过程中桩周土体孔隙率、配位数及应力变化规律。研究表明:随着推进比的减小,螺旋桩安装时受到的竖向力与扭矩也随之降低,对桩周土体的扰动也更小;螺旋桩在推进比为1时安装与在推进比小于1时安装存在两种不同的安装机制。研究结果对进一步确定螺旋桩在不同推进比下的安装条件具有一定意义。

论新质生产力的生成:高深知识生产、技术元素整合与产业技术突破

作为普通生产力的进化,新质生产力从根本上构建了现代化国家建设的中国路径。高深知识生产、技术元素整合和产业技术突破是新质生产力生成的3个关键环节。新质生产力的生成以战略性新兴产业与未来产业为依托,表征为新的市场需求的创造与满足,以及生产效率的大幅提升,其关键在于高深知识生产质量的提升、技术元素的充分整合以及产业技术实现从0到1的突破。新质生产力是战略性新兴产业与未来产业发展的重要支撑,面临高深知识生产的难度增加与成本升高、产业周期与经济周期的叠加影响、追赶效应与趋同理论支配下的国家发展瓶颈等困境。以新质生产力应对剧变中的世界秩序,需要考虑科技创新生态系统的复合型结构与自我进化能力,技术元素的自我生成、自我发展和自我增强,以及创新生态的自适应性与多中心结构等因素。面对正在进行的新型工业化革命,需要建立一个面向未来的、能够将高深知识生产与产业技术突破深度融合且不断自我进化的创新生态系统,进而突破传统的消费、信贷以及货币政策驱动的生产与分配模式,在国家层面构筑一个超大型、稳定有效且具备价值提升能力的资产组合。高等教育应当成为政府和社会“永不退出的价值投资”,在世界经济整体下行的经济周期内,国家和社会更应当加大对高等教育的综合投入:根据区域经济与产业经济带的内生需求以及新型知识生产模式建设新型研究型大学集群和学科集群;基于技术要素流动与整合构建新型高等教育创新与激励机制;形成科技革命的回馈循环机制,将高等教育打造成科技创新生态系统的关键环节。

改良膜龈手术在牙龈退缩治疗中的应用

随着人们对美观需求的日益提升,治疗牙龈退缩已经成为牙周科临床常见的患者诉求。临床上主要通过手术的方式治疗牙龈退缩,常见的手术包括游离龈移植术、带蒂瓣技术和双层瓣技术,适应证选择恰当时,通常可以获得满意的效果,但上述术式仍存在一定的不足,如根面覆盖效果不理想等。近年来,学者们针对这些不足陆续提出了一些改良方案来治疗不同程度的牙龈退缩,如改良游离龈移植术,即包含龈乳头及游离龈的牙龈单元移植,可改善受体区血供,提高根面覆盖效果,其针对轻度退缩的部位可获得良好的根面覆盖,同时可增宽角化龈和加深前庭沟,但应用于上颌美学区时可能存在术后牙龈颜色、形态不协调,美学效果欠佳的问题。牙龈瓣采用半厚-全厚-半厚的技术进行制备的改良冠向复位瓣,用于多颗牙牙龈退缩时,以退缩最严重牙为中心的改良切口设计的冠向复位信封瓣技术,可提高根面覆盖效果。不离断龈乳头,使龈瓣形成隧道,以容纳移植物的隧道技术及各种改良的隧道技术,可以有效减少术区的组织损伤,并促进创面愈合。本文通过对各类术式的阐述和文献回顾,总结改良膜龈手术治疗牙龈退缩的临床应用及注意事项,并提出牙龈退缩的治疗方案建议,同时强调牙龈退缩的对因治疗,以达到稳定的根面覆盖效果。创伤小、疗效稳定的手术方式和治疗方法是今后膜龈手术的发展方向。

新型混合式贯通牵引供电系统及其复合控制策略

电分相与负序等电能质量问题是制约电气化铁路向高速化、重载化发展的桎梏。贯通牵引供电系统为消弭上述问题提供了契机,但既有贯通方案依然存在所需器件数目多、改造成本高、可靠性差等弊端。为此,在充分利用既有牵引变压器基础上,该文设计一种新型混合式贯通牵引供电装置。该装置通过共直流侧与功率均分手段有效抵消输入侧纹波功率,降低有源/无源器件数目与电容容量。同时,针对直流侧二次纹波与负荷功率冲击,提出一种输入端口复合控制策略,有效解决纹波传递与冲击波动问题。最后通过仿真与实验验证所提装置及其控制策略的可行性与可靠性。

我国校园足球教育的底层逻辑、现实挑战及推进理路研究

《中国足球改革发展总体方案》赋予了校园足球普及和竞技人才培育“一体两面”的任务,并指出我国对足球价值和规律认识不足,急功近利思想行为严重。当前我国校园足球正处于扩容基础上,探索面向精英培养,提升竞技人才培育、遴选和贯通人才输送通道,为足球后备人才储备贡献教育系统智慧与力量的攻坚阶段。但尤其对现代足球本质及其与校园足球开展的底层逻辑问题认知,尚处于“碎片化”或笼统绝对的模糊水平,仍是导致当前校园足球流于形式、行为盲目,甚至乱象的重要根源。由此,聚焦“校园何以足球”的底层逻辑及现实挑战,主要运用文献资料、专题座谈等方法,在理论上廓清了足球运动的文化本质,价值主体需求动态、多元、相对不确定性和足球运动表象特征基础上,并通过对现代足球起源中走进校园的基础、机缘与“初心”及不断繁荣发展演化成形史回溯,在学理和实践史层面厘清了现代足球的文化本质及其“天然”的教育渊源、底色等校园足球的底层逻辑,揭示了现代足球教育属性、价值应然之辩证发展观;并结合当前我国校园足球理想诉求与相关不足,提出现阶段何以振兴亟待明晰的重要理路,旨为推进我国校园足球“体教融合”攻坚提供基础认知及实践参考。

肉制品中晚期糖基化终末产物研究进展

肉类富含蛋白质和脂质,有利于晚期糖基化终末产物(AGEs)的生成。研究表明,AGEs会对人体产生多种危害,应尽量减少其在加工过程中的生成量。本文对近年来食品中尤其是肉制品中AGEs的形成、危害、检测进行介绍,并综述影响肉制品中AGEs生成量的因素,以期为探究减少肉制品加工过程中AGEs生成量的新方法提供思路。

纺织科技发展前沿

随着科学技术的创新和进步,纺织行业不断迭代升级。前沿技术的跨界与融合,在理论、应用领域不断推动纺织科技取得重大进步与突破。通过介绍先进技术在纺织纤维材料、纺织智能制造、纺织绿色加工和先进纺织品领域的应用,综述了纺织行业从纤维到制造,再到后道加工和应用的全流程研究进展,总结了纺织纤维先进制备技术、计算机数字化技术在纺织制造领域的应用,和以环保为核心的纺织绿色加工技术、高科技纺织品在各大产业的应用。随着科技的进一步革新以及对绿色纺织品的更高要求,以高效化、数字化、智能化、绿色化为导向的多元发展仍是纺织技术革命的方向。

论习近平文化思想的世界观和方法论

习近平文化思想既有文化理论观点维度的创新和突破,又对文化工作布局作了新部署、新要求,标志着我们党对中国特色社会主义文化建设规律的认识达到了新高度,为进一步做好新时代新征程宣传思想文化工作、担负起新的文化使命提供了强大思想武器和科学行动指南。习近平文化思想蕴含着丰富的世界观和方法论,其中坚持人民至上是习近平文化思想的价值立场,坚持自信自立是习近平文化思想的精神气质,坚持守正创新是习近平文化思想的发展路径,坚持问题导向是习近平文化思想的实践原则,坚持系统观念是习近平文化思想的思想方法,坚持胸怀天下是习近平文化思想的境界格局。习近平文化思想是一个开放的和发展的理论体系,必将随着中国式现代化的文化建设不断丰富和完善。