小主动脉瓣环行SJM Regent机械瓣膜置换术的临床研究

目的研究分析SJM Regent机械瓣膜置换术在小主动脉瓣环置换中的应用效果。方法选取我院2019年1月~2024年1月收治的主动脉瓣病变患者160例,采用随机盲选的方式选入研究组患者共120例,采用SJM Regent机械瓣膜置换术治疗,并根据瓣环直径大小分为17mm组、19mm组、21mm组,每组40例,另40例患者作为对照组,采取AVR机械瓣膜置换术进行治疗,分析疗效。结果治疗后,研究组中3组患者与对照组相比,心功能等级差异无统计学意义(P>0.05);治疗后,两组患者超声心动图数据均有所改善,研究组中3组患者与对照组相比,差异无统计学意义(P>0.05);在治疗安全性方面,与对照组相比,研究组中3组患者治疗后并发症发病率低,但组间比较差异无统计学意义(P>0.05)。结论SJM Regent机械瓣膜置换术在小主动脉瓣环置换中,患者心功能、心脏状态及主动脉瓣血流动力学均能够得到切实改善,同时可有效保障其疾病治疗安全性。

Porous Flame-retarded Asphalt Pavement for Highway Tunnel

A new way to improve the tunnel fire protection by using flame-retarded porous asphalt pavement containing ATH powders was introduced. Based on the miniature burning test designed and conducted, the burning time and temperature of porous asphalt （PA） and flame-retarded porous asphalt （FRPA） were studied comparing with cement concrete pavement, dense-graded lIMA and SMA. Results of burning test and pavement performance test indicate that FRPA is appropriate and suitable as the pavement material of highway tunnel.

Research on Alkaline Filler Flame-Retarded Asphalt Pavement

Used as flame returdant of tunnel asphalt pavement, organic bromides produce a large amount of poisons and smoke in construction and flame retardation stage. The alkaline filler was found to replace mineral filler, and the flame- retarded asphalt mixtures were produced. Experimental results show that these asphalt mixtures are smoke restrained ; the performances and construction technology of asphalt pavement are not influenced; also the alkaline filler is of low-price. So this kind of flame-retarded asphalt mixtures is suitable for tunnel patement.

Leakage Proof,Flame-Retardant,and Electromagnetic Shield Wood Morphology Genetic Composite Phase Change Materials for Solar Thermal Energy Harvesting

Phase change materials(PCMs)offer a promising solution to address the challenges posed by intermittency and fluctuations in solar thermal utilization.However,for organic solid-liquid PCMs,issues such as leakage,low thermal conductivity,lack of efficient solar-thermal media,and flamma-bility have constrained their broad applications.Herein,we present an innova-tive class of versatile composite phase change materials(CPCMs)developed through a facile and environmentally friendly synthesis approach,leveraging the inherent anisotropy and unidirectional porosity of wood aerogel(nanowood)to support polyethylene glycol(PEG).The wood modification process involves the incorporation of phytic acid(PA)and MXene hybrid structure through an evaporation-induced assembly method,which could impart non-leaking PEG filling while concurrently facilitating thermal conduction,light absorption,and flame-retardant.Consequently,the as-prepared wood-based CPCMs showcase enhanced thermal conductivity(0.82 W m^(-1)K^(-1),about 4.6 times than PEG)as well as high latent heat of 135.5 kJ kg^(-1)(91.5%encapsula-tion)with thermal durability and stability throughout at least 200 heating and cooling cycles,featuring dramatic solar-thermal conversion efficiency up to 98.58%.In addition,with the synergistic effect of phytic acid and MXene,the flame-retardant performance of the CPCMs has been significantly enhanced,showing a self-extinguishing behavior.Moreover,the excellent electromagnetic shielding of 44.45 dB was endowed to the CPCMs,relieving contemporary health hazards associated with electromagnetic waves.Overall,we capitalize on the exquisite wood cell structure with unidirectional transport inherent in the development of multifunctional CPCMs,showcasing the operational principle through a proof-of-concept prototype system.

Flame-retardant ammonium polyphosphate/MXene decorated carbon foam materials as polysulfide traps for fire-safe and stable lithium-sulfur batteries

Lithium-sulfur(Li-S)batteries are one of the most promising modern-day energy supply systems because of their high theoretical energy density and low cost.However,the development of high-energy density Li-S batteries with high loading of flammable sulfur faces the challenges of electrochemical performance degradation owing to the shuttle effect and safety issues related to fire or explosion accidents.In this work,we report a three-dimensional(3D)conductive nitrogen-doped carbon foam supported electrostatic self-assembled MXene-ammonium polyphosphate(NCF-MXene-APP)layer as a heat-resistant,thermally-insulated,flame-retardant,and freestanding host for Li-S batteries with a facile and costeffective synthesis method.Consequently,through the use of NCF-MXene-APP hosts that strongly anchor polysulfides,the Li-S batteries demonstrate outstanding electrochemical properties,including a high initial discharge capacity of 1191.6 mA h g^(-1),excellent rate capacity of 755.0 mA h g^(-1)at 1 C,and long-term cycling stability with an extremely low-capacity decay rate of 0.12%per cycle at 2 C.More importantly,these batteries can continue to operate reliably under high temperature or flame attack conditions.Thus,this study provides valuable insights into the design of safe high-performance Li-S batteries.

44例小主动脉瓣环患者应用17mm St Jude Regent机械瓣术后早中期疗效分析

目的分析我院的44例小主动脉瓣环(直径≤17mm)患者行St Jude Medica Regent瓣膜置换术后心功能等改变,探讨是否存在植入瓣膜与患者不匹配现象。方法2007年10月至2009年3月,我院有44例小主动脉瓣环(直径≦17mm)患者,置换17mm St Jude Medica Regent机械瓣膜组;随机选择同期44例直径为21mm患者,置换21mm St Jude机械瓣膜组。术后随访两组患者的临床症状、体征,心电图、超声心电图等指标,采用SPSS13.0统计软件进行比较分析。结果17mm St Jude Medica Regent机械瓣膜组中,心电图检查8例有ST段改变,术后3例仍存在胸闷症状,偶尔有胸痛不适3例;术后心功能Ⅱ级8例、Ⅲ级4例。21mm St Jude机械瓣膜组术后心电图检查6例有ST段改变,2例有胸闷症状,偶尔有胸痛不适2例;术后心功能Ⅱ级11例,Ⅲ级2例,两组间比较差异无统计学意义(P=0.32)。两组患者术后左心室舒张期末内径、左心室后壁厚度、左心室重量指数、主动脉跨瓣压差等均较术前明显改善(P<0.05),左心室射血分数(LVEF)术后6～12月与术前比较明显提高(P<0.05),但两组间比较差异无统计学意义((P>0.05)。结论对于体重较轻(≤60kg)、体表面积较小(≤1.6cm2)的小主动脉瓣环患者,置换17mm St Jude Medical Regent机械瓣后,能取得较好的效果,部分指标已经接近或达到置换外径21mm St Jude机械瓣膜组,无明显PPM现象,无须行主动脉瓣环扩大术。

小主动脉瓣环患者应用Regent机械瓣术后心功能变化的评价

目的探讨小主动脉瓣环（直径≤19mm）患者行St．Jude Medical Regent（SJM Regent）瓣膜置换术后的心功能改变，研究是否存在植入瓣膜与患者不匹配（Prosthesis-Patient Mismatch，PPM）现象．以及是否有行主动脉瓣瓣环扩大术的必要。方法2004年3月-2005年3月，22例主动脉瓣环直径≤19mm患者置换SJM Regent机械瓣，用彩色多普勒超声仪对左心功能进行术前、术后监测．并与22例置换St．Jude Medical Hemodynamic Plus Series（SJMHP）机械瓣及22例置换外径23mm常规机械瓣患者进行对比。结果置换SJM Regent机械瓣膜患者术后的左心功能指标较术前明显好转，左室射血分数、左室缩短分数、瓣膜有效开口面积／体表面积之比（EOA指数）明显上升，左室重量指数及主动脉跨瓣压差也有不同程度降低。左心功能各项指标改善明显好于置换SJMHP机械瓣患者．部分指标接近或好于置换外径23mm瓣膜者。结论对于小主动脉瓣环患者．置换Regent机械瓣后指标已经接近或达到置换外径23mm常规瓣膜者，无PPM现象，大部分患者无须行主动脉瓣瓣环扩大术。

高效低毒杀虫剂Regent 0.3G对甘蔗螟虫控制作用的研究

本文报道了5种杀虫剂防治蔗螟的效果。试验中Regent(锐劲特)用量低且防效最佳,剂量ai50～150g/hm2的防效为62.25%～84.86%。实验中还发现常用药剂呋喃丹的防效明显下降。本文还就引起常用药剂下降的原因进行了分析,提出应加快氟虫腈在甘蔗上的推广力度。

小主动脉瓣环患者行17mm SJM Regent瓣置换术早、中期疗效观察

目的探讨小主动脉瓣环（直径〈17mm）患者行17mm SJM Regent瓣置换术，术后是否产生不匹配（PPM）现象，以及早、中期疗效。方法13例单纯主动脉瓣狭窄（瓣环直径〈17mm）患者置换17mm SJM Regent瓣机械瓣，用彩色多普勒超声仪对左心功能进行术前、术后监测并与13例置换21mm常规机械瓣患者进行对比。结果无围术期死亡，随访6—36个月无瓣膜相关性并发症，3例患者出院时有中度PPM（EOAI〈0．85cm^2／m^2），13例患者术后跨瓣压差及左室心肌质量指数较术前均明显下降（P〈0．05），与常规21mm机械瓣患者比较差异无统计学意义。结论对于小主动脉瓣环（直径〈17mm）患者行17mm SJM Regent机械瓣置换是一种安全有效的选择，中度PPM对患者早中期预后无影响，无需进行主动脉根部扩大术。

Flame-retardant Mechanism of Magnesium Oxychloride in Epoxy Resin

Flame-retardant mechanism of magnesium oxychloride （M OC） in EP was in-vestigated by limiting oxygen index （LOI）, XRD, SEM, TG-DTG and DSC. The results show that MOC performed well as an inorganic flame-retardant in EP. When the content of MOC is 50%, the LOI of EP reaches 29.6% and mass of residual char reaches 9.6%. The flame retarde mechanism of MOC is due to the synergies of diluting, cooling, catalyzing char forming and obstructing effects.

Comparison of Flame-retardancy Property and Mechanism between a Phosphate Ester and a Phosphoramine Flame-retardants

A halogen-free flame-retardant (hydroquinone bis (N,N’-diarylphosphoramidate),4N-HDP) containing phosphorus-nitrogen was synthesized.Its structure was characterized by infrared spectroscopy (IR),nuclear magnetic resonance (^(1)H-NMR and^(31)P-NMR).Thermogravimetric analysis (TG),limiting oxygen index (LOI),UL-94 vertical burning test (UL-94),thermogravimetric-infrared instrument (TG-IR) and scanning electron microscopy (SEM) were used to compare the flame-retarding performance and mechanism of hydroquinone bis (diphenyl phosphate) (HDP) and 4N-HDP.TG,IR and TG-IR were used for comparative analysis,indicating that both HDP and 4N-HDP are flame-retardants,and the gas phase and condensed phase act synergistically.In the pyrolysis process,it is divided into two steps:the first step is the breakage of large molecules to small molecules;the second step is the gasification and carbonization of small molecules,and eventually produces phosphate ester and non-flammable gases.Through the comparison of various results,it could be found that 4N-HDP has better flame-retarding performance compared to HDP in the composite with polycarbonate (PC).

3D flame-retardant skeleton reinforced polymer electrolyte for solid-state dendrite-free lithium metal batteries

For solid polymer electrolytes(SPEs),improving their mechanical and electrochemical properties is the key to obtaining batteries with higher safety and higher energy density.Herein,a novel synergistic strategy proposed is preparing a 3D flame-retardant skeleton(3DPA)and adding nano-multifunctional fillers(Li-ILs@ZIF-8).In addition to providing mechanical support for the polyethylene oxide(PEO)matrix,3DPA also has further contributed to the system’s flame retardancy and further improved the safety.Simultaneously,the electrochemical performance is fully guaranteed by rigid Li-ILs@ZIF-8,which provides fast migration channels forLi^(+),reduces the crystallinity of PEO and effectively inhibits lithium dendrites.The limiting oxygen index of the optimal sample(PL3Z/PA)is as high as 20.5%,and the ionic conductivity reaches 2.89×10^(-4) and 0.91×10^(-3) S cm^(-1) at 25 and 55°C,respectively.The assembled Li|PL3Z/PA|Li battery can be cycled stably for more than 1000 h at a current density of 0.1 m A cm^(-2) without short circuit being pierced by lithium dendrites.The specific capacity of the LFP|PL3Z/PA|Li battery was 160.5 m Ah g^(-1) under a current density of 0.5 C,and the capacity retention rate was 90.0%after 300 cycles.

A new flame-retardant polymer electrolyte with enhanced Li-ion conductivity for safe lithium-sulfur batteries

Flame-retardant polymer electrolytes(FRSPEs)are attractive due to their potential for fundamentally settling the safety issues of liquid electrolytes.However,the current FRSPEs have introduced large quantity of flame-retardant composition which cannot conduct lithium ions,thus decreasing the Li-ion conductivity.Here,we synthesize a novel liquid monomer 2-((bis((2-oxo-1,3-dioxolan-4-yl)methoxy)phosphoryl)oxy)ethyl acrylate(BDPA)for preparing FRSPE by in-situ polymerization,in which PBDPA polymer can not only conduct lithium ions,but also prevent burning.The prepared FRSPE demonstrated outstanding flame-retardant property,favorable lithium-ion conductivity of 5.65×10^(-4) S cm^(-1) at ambient temperature,and a wide electrochemical window up to 4.5 V.Moreover,the Li/in-situ FRSPE/S@pPAN cell exhibited favorable electrochemical performances.We believe that this work provides an effective strategy for establishing high-performance fireproof quasi-solid-state battery system.

Regent在大型合成氨装置联锁保护系统中的应用及评价

对Ｒｅｇｅｎｔ系统在宁夏化工厂合成氨装置中实现联锁保护系统的构成、运行情况进行了综合评价。

Property of Polyimide/Flame-Retardant Viscose Blended Fabrics

Although polyimide fibers are excellent intrinsic flame-retardant fibers, their price is so high that they are rarely used in clothing. To expand their application, the polyimide fibers were blended with flame-retardant viscose fibers at a ratio of 30∶70, and the blended yarns were woven with flame-retardant polyester filaments. Fabrics with different parameters, including fabric weaves, warp yarn densities, and fabric layers, were designed, and the effects of those fabric parameters on mechanical properties and flame-retardant properties were tested and analyzed. The results show that the tearing load of the fabrics is affected by fabric weaves, warp yarn densities, and fabric layers, and the tearing load of the weft mountain weave fabric and the twill weave fabric is higher than that of the plain weave fabric. The bursting load of the fabric increases with the increase of warp yarn densities and layers. Among the tested fabric samples, the triple-layer twill fabric has the best flame-retardant performance, which meets the standard of flame-retardant protective fabric Grade B1 level. The research of this paper would provide guidance for the development and production of polyimide blended fabrics.

SYNTHESES AND CHARACTERIZATION OF CYCLIC ORGANIC BORONATE ESTERS AS FLAME-RETARDANTS

Some organoboron compounds as flame-retardants for fiber materials were prepared.Flame-retarding properties of these compounds determined by the Oxygen-Index Method weregood.These new compounds were characterized by IR,~1H NMR spectrum and elementalanalysis.

Flame-retardant oligomeric electrolyte additive for self-extinguishing and highly-stable lithium-ion batteries:Beyond small molecules

Preparing both safe and high-performance lithium-ion batteries(LIBs) based on commonly used commercial electrolytes is highly desirable,yet challenging.To overcome the poor compatibility of conventional small-molecular flame-retardants as electrolyte additives for safe LIBs with graphite anodes,in this study,we propose and design a novel low-cost flame-retardant oligomer that achieves an accurate and complete reconciliation of fire safety and electrochemical performance in LIBs.Owing to the integration of phosphonate units and polyethylene glycol(PEG) chains,this oligomer,which is a phosphonatecontaining PEG-based oligomer(PPO),not only endows commercial electrolytes with excellent flame retardancy but also helps stabilize the electrodes and Li-ion migration.Specifically,adding 15 wt% of PPO can reduce 70% of the self-extinguishing time and 54% of total heat release for commercial electrolytes.Moreover,LiFePO_(4)/lithium and graphite/lithium cells as well as LiFePO_(4)/graphite pouch full cells exhibit good long-term cycling stability.

基于数据生命周期的煤泥浮选智能控制技术研究进展

随着国家政策和新一代人工智能技术的持续牵引,矿山智能化研究取得突破,其中,选煤厂智能化建设受到高度关注,煤泥浮选智能控制技术一直是阻碍选煤厂智能化建设的关键瓶颈之一。以煤泥浮选数据生命周期为主线,从浮选精煤/尾煤灰分在线预测、浮选药剂智能添加和煤泥浮选系统智能决策3个角度综述了煤泥浮选智能控制技术的研究进展,并展望未来煤泥浮选智能控制技术发展趋势。浮选精煤灰分在线预测困难重重,单一视觉特征信息并不可靠,尾矿灰分的预测技术相对更加成熟可靠;浮选药剂添加量受多个过程变量同时制约,模型性能在整个工况区间的自适应性和泛化能力还需进一步提升;当前浮选工业系统智能控制技术的进一步发展严重受限于浮选精煤/尾煤灰分等指标的预测精度、传感器检测精度、药剂添加精度等因素。浮选过程数据集维度更高,难以建立可靠的知识库,以深度学习为代表的新一代人工智能技术能适应这类数据结构。此外,已有浮选监测系统只针对特定矿物,唯一性较高。未来浮选智能控制系统应集中攻克指标预测、传感器检测精度等方面限制,建立多煤种、模板化的煤泥浮选智能控制资料大数据集和大模型。

REGENT系统在加氢裂化装置的应用

1996年7月加氢装置联锁系统进行了改造，其逻辑单元采用了转用安全控制设备Regent系统，本文就该系统的组成，设计和组态进行了介绍。