HNCOCa^(+)的光谱和成键:基质隔离和计算研究

金属(异)氰化物是星际介质中金属化合物的主要组成部分.它们的氧化物-金属(异)氰酸作为潜在的星际分子也备受关注.然而,作为金属(异)氰酸的前体,阳离子HNCOM^(+)的研究却非常有限.本文通过红外光谱、同位素取代和量子化学计算,对HNCOCa^(+)进行了详细研究.为了进行对比,还探索研究了HNCOBe^(+)和HNCOBa^(+)阳离子.结果表明,金属阳离子与HNCO反应可以生成HNCOCa^(+)和HNCO-Be^(+),但未观测到HNCOBa^(+)的生成.HNCOCa^(+)中非对称和对称NCO伸缩振动频率(2362.6和1330.4 cm^(-1))高于自由的HNCO分子(2268.5和1320.3 cm^(-1)),但比HNCOBe^(+)(2426.4和1355.2 cm^(-1))低.这些频率的变化是由HNCOBe^(+)和HNCOCa^(+)中NCO单元内的电荷极化导致.成键分析表明,HNCO-Be^(+)键倾向于共价性质(54%),而HNCO-Ca^(+)键则具有较高的静电性质(57%).在HNCO-Ba^(+)键中,占主导的静电相互作用(64%)导致了低的O-Ba键能,这解释了其在实验中未被制备的原因.

Effects of drought on non-structural carbohydrates and C,N,and P stoichiometric characteristics of Pinus yunnanensis seedlings

To study non-structural carbohydrate character-istics and nutrient utilization strategies of Pinus yunnanen-sis under continuous drought conditions,2-year-old seed-lings were planted in pots with appropriate water,light and moderate and severe drought treatments[(80±5),(65±5),(50±5),and(35±5)%of field water-holding capacity].Non-structural carbohydrates,carbon(C),nitrogen(N),and phosphorus(P)concentrations were measured in each plant component.The results show that:(1)With increasing drought,non-structural carbohydrates gradually increased in leaves,stems,and coarse roots,while gradually decreased in fine roots;(2)C concentrations of all were relatively stable under different stress levels.Phosphorous utilization of each component increased under light and moderate drought conditions,while N and P utilization efficiency of each plant component decreased under severe drought.Growth was mainly restricted by N,first decreasing and then increasing with increased drought;(3)There was a correlation between the levels of non-structural carbohydrates and C,N,and P in each component.Changes in N concentration affected the interconversion between soluble sugar and starch,which play a regulatory role in the fluctuation of the concentration of non-structural carbohydrates;and,(4)Plasticity analysis showed that P.yunnanensis seedlings responded to drought mainly by altering starch concentration,the ratio of soluble sugar to starch in leaves and stems,and further by alter-ing N and P utilization efficiencies.Overall,these results suggest that the physiological activities of all organs of P.yunnanensis seedlings are restricted under drought and that trade-offs exist between different physiological indicators and organs.Our findings are helpful in understanding non-structural carbohydrate and nutrient adaptation mechanisms under drought in P.yunnanensis seedlings.

Exploring Efficient Salary Management Systems:A Case Study of Hefei Yusheng Hotel Management Co.,Ltd.

The issue of brain drain poses a significant obstacle to the development of the hotel and catering industry.Attracting and retaining skilled personnel to engage in management within this sector has emerged as a primary challenge.This paper examines the current landscape of China’s catering service industry and its salary management system,identifying key challenges encountered in salary management within the industry.Drawing upon salary management theory and insights into existing challenges,the paper proposes specific treatment measures and management strategies.

骨髓基质细胞通过TSP-1/CD36通路对急性髓系白血病细胞影响的初步研究

目的:探讨骨髓基质细胞(bone marrow-derived mesenchymal stromal cells,BM-MSCs)对急性髓系白血病(acute myeloid leukemia,AML)细胞影响的作用机制。方法:构建MLL-AF9过表达诱导的AML小鼠模型,通过PCR比较AML小鼠和野生型小鼠(WT)BM-MSCs内TSP-1的表达差异。通过慢病毒载体使AML小鼠来源的BM-MSCs高表达TSP-1后,与AML细胞行transwell共培养,检测AML细胞表面TSP-1受体CD36及CD47的表达及AML细胞的生长情况。在共培养体系中加入CD36抑制剂N-油酰基硫代琥珀酰亚胺,检测AML细胞增殖、凋亡的变化。结果:AML小鼠BM-MSCs中TSP-1的表达低于对照组。过表达TSP-1的BM-MSCs与AML细胞行transwell共培养后AML细胞的生长受到抑制,且AML细胞表面的CD36受体表达升高,但CD47表达无明显差异。在共培养体系中加入CD36抑制剂N-油酰基硫代琥珀酰亚胺后,AML细胞增殖加快,凋亡减少。结论:TSP-1/CD36信号通路有望成为治疗AML的潜在靶点。

钙钛矿氧化物在水裂解反应中的电催化研究

氢因具有高热值、资源丰富和环境友好等优点,被认为是推动全球能源系统脱碳转型的强大动力.基于可再生能源的电解水制氢技术是实现碳中和目标的重要途径,该技术亟需开发低成本、高活性和高稳定性的电解水催化剂.钙钛矿氧化物具有高容忍度的晶体结构、灵活的元素组成和可调变的电子结构,是开发新型电催化剂的理想材料.此外,许多基于钙钛矿氧化物的研究还揭示了电催化剂中涉及的一些催化关键问题,如构效关系、电子结构调控作用、催化机理以及催化剂的动态结构演化等,使钙钛矿氧化物逐渐成为推广科学理论的理想模型催化剂.虽然人们已经在性能优化策略(如元素掺杂、纳米结构工程、缺陷调节)、应用环境(如酸性或碱性介质中)、所含元素(如钴基、铱基和镍基钙钛矿氧化物)等方面对此类催化剂进行了详细总结,但对其催化时所涉及的诸多关键科学问题却缺乏系统讨论.本文总结了钙钛矿氧化物在电催化水裂解反应方面的研究进展,尤其对近期引起关注的关键科学问题进行了详细讨论.首先回顾了钙钛矿氧化物在催化领域的发展历程,随后介绍了钙钛矿氧化物在元素组成与晶相结构方面的多样性.在深入探讨了钙钛矿氧化物中电子特性与催化性能之间的构效关系后,列举了几种代表性的活性描述符(即eg轨道填充数、B-O键共价性、O 2p带中心位置和电荷转移能),分析了各自的适用范围与局限性.重点研究了钙钛矿型电催化剂在水裂解过程中的催化机理和结构演变,强调了原位表征技术在监测动态结构信息和识别关键活性物种方面的重要性.最后,展望了钙钛矿型催化剂应用于电解水技术中的机遇和挑战,提出了此类催化剂的未来发展方向:(1)探索更为理性的材料设计策略;(2)发展更先进的制备技术;(3)揭示更深层次的催化/失活机制;(4)开发更能满足工业需求的高性能催化剂.

Significant wave height forecasts integrating ensemble empirical mode decomposition with sequence-to-sequence model

As wave height is an important parameter in marine climate measurement,its accurate prediction is crucial in ocean engineering.It also plays an important role in marine disaster early warning and ship design,etc.However,challenges in the large demand for computing resources and the improvement of accuracy are currently encountered.To resolve the above mentioned problems,sequence-to-sequence deep learning model(Seq-to-Seq)is applied to intelligently explore the internal law between the continuous wave height data output by the model,so as to realize fast and accurate predictions on wave height data.Simultaneously,ensemble empirical mode decomposition(EEMD)is adopted to reduce the non-stationarity of wave height data and solve the problem of modal aliasing caused by empirical mode decomposition(EMD),and then improves the prediction accuracy.A significant wave height forecast method integrating EEMD with the Seq-to-Seq model(EEMD-Seq-to-Seq)is proposed in this paper,and the prediction models under different time spans are established.Compared with the long short-term memory model,the novel method demonstrates increased continuity for long-term prediction and reduces prediction errors.The experiments of wave height prediction on four buoys show that the EEMD-Seq-to-Seq algorithm effectively improves the prediction accuracy in short-term(3-h,6-h,12-h and 24-h forecast horizon)and long-term(48-h and 72-h forecast horizon)predictions.

Effects of Strain Rate and Fiber Content on the Dynamic Mechanical Properties of Sisal Fiber Cement-Based Composites

In this paper,a split Hopkinson pressure bar(SHPB)was used to investigate the dynamic impact mechanical behavior of sisal fiber-reinforced cement-based composites(SFRCCs),and the microscopic damage evolution of the composites was analyzed by scanning electron microscopy(SEM)and energy-dispersive X-ray spectrome-try(EDS).The results show that the addition of sisal fibers improves the impact resistance of cement-based composite materials.Compared with ordinary cement-based composites(OCCs),the SFRCCs demonstrate higher post-peak strength,ductility,and energy absorption capacity with higher fiber content.Moreover,the SFRCCs are strain rate sensitive materials,and their peak stress,ultimate strain,and energy integrals all increase with increasing strain rate.From the perspective of fracture failure characteristics,the failure of OCCs is dominated by the brittle failure of crystal cleavage.In contrast,the failure mode of the SFRCCs changes to microscale matrix cracks,multi-scale pull-out interface debonding of fibers(fine filaments and bundles),and mechanical interlock.This research provides an experimental basis for the engineering application of high-performance and green cement-based composites.

氧化还原对Lindqvist型多金属氧簇复合物自组装的动态调控

自组装的动态调控对材料科学的发展至关重要,它在智能材料和器件的开发中具有巨大的潜力。多金属氧簇是一类纳米尺度的无机功能簇,尤其是当它被有机组分共价修饰或者非共价修饰之后,已经发展成为超分子自组装中优异的构筑基元之一。多金属氧簇是典型的刺激响应功能团簇,光化学或电化学方法可将其还原为混合价态,即使经历了逐步的多电子氧化还原后多金属氧簇的结构仍保持不变。多金属氧簇独特的光致变色使其表现出不同的光物理性质,这激励着我们去开发基于多金属氧簇复合物的动态自组装。Lindqvist型六钼酸盐簇[Mo6O19]2-是负电荷数目最少的多金属氧簇之一,是构筑新颖组装结构的理想构筑基元。本文在乙腈溶剂中用十八烷基三甲基铵替换Lindqvist型多金属氧簇复合物(TBA)2[Mo6O19]的抗衡离子,通过简单的替换方法制备了一种单链表面活性剂包覆的多金属氧簇复合物(ODTA)2[Mo6O19]。通过核磁共振氢谱、红外光谱、热重分析和元素分析表征了多金属氧簇复合物的结构。复合物(ODTA)2[Mo6O19]在乙腈和异丙醇(体积比是4比1)中的溶液在经过交替的紫外光照和空气氧化后表现出了可逆的光致变色性质。复合物的溶液经紫外光照后由浅黄色快速变成蓝色。紫外可见吸收光谱在751 nm处出现的宽吸收带归属于MoV→MoVI的价间电荷转移跃迁,这表明还原态多金属氧簇的形成。经过空气氧化之后蓝色褪去。这种可逆的光致变色可以多次循环实现。扫描电镜、透射电镜和X射线衍射的测试证实了复合物在乙腈和异丙醇中形成了螺旋形貌的组装体。更有意义的是,复合物在光致变色的同时发生了从螺旋条带到球形组装体的形貌转变。光致变色过程中的形貌演变是从短螺旋条带经过海胆型聚集体变为球形组装体。最重要的是,经过空气氧化后螺旋组装体可以再次恢复,表明这是由氧化还原刺激驱动的可逆形貌转变。X射线光电子能谱和核磁共振氢谱的测试表明,氧化还原调控的可逆自组装是由无机簇与有机阳离子之间静电吸引力和无机簇之间静电排斥力的变化所驱动的。此研究结果将有助于更好地理解动态自组装的机理,并有助于推动先进智能材料的精准制备。

肺结节患者焦虑抑郁与Th17/Treg和炎症水平改变的相关性研究

背景与目的肺癌的发病率逐年攀升,人们在体检时尤其注重对肺进行检查,得益于低剂量计算机断层扫描技术的普及,不仅肺癌能够得到早期诊断,很多肺结节也在体检时被发现,并成为当下不可忽视的重要健康问题。肺结节患者极易出现焦虑、抑郁等不良情绪,研究表明情绪障碍患者存在机体免疫功能失调和炎症水平变化,本研究旨在探讨肺结节患者焦虑抑郁与Th17/Treg和炎症水平改变的相关性。方法纳入2019年4月-2019年7月就诊于安徽医科大学第一附属医院门诊受试者共143例,采用贝克焦虑量表(Beck Anxiety Inventory,BAI)、贝克抑郁量表第二版(Beck Depression Inventory-Ⅱ,BDI-Ⅱ)进行评估。其中健康对照(healthy control,HC)组40例;肺结节患者103例,依据量表评分分为焦虑和(或)抑郁(anxiety and/or depression,AD)组41例和无焦虑抑郁(non-anxiety and non-depression,NAD)组62例。检测外周血辅助性T细胞17(T helper cell 17,Th17)、调节T细胞(regulatory T cells,Tregs)百分比,计算Th17细胞绝对值;检测血清炎症因子,并分析组间差异及相关性。结果三组间Th17细胞百分比、Th17细胞绝对数、Th17/Treg、白细胞介素-2(interleukin-2,IL-2)、IL-6、肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)水平的差异有统计学意义(均P<0.001),AD组高于HC组和NAD组(均P<0.05),HC组和NAD组间差异无统计学意义(均P>0.05)。以上指标与焦虑、抑郁的严重程度无显著相关性(P>0.05)。Tregs百分比、IL-4、IL-10水平在各组间差异无统计学意义(均P>0.05)。女性肺结节患者焦虑和(或)抑郁比例高于男性(P<0.05)。结论肺结节患者易出现不同程度的焦虑、抑郁的情绪变化,进而导致机体出现免疫功能失调和低级别炎症。

CNGBdb:国家基因库生命大数据平台

国家基因库生命大数据平台(China National GeneBank DataBase,CNGBdb)是一个致力于生命科学多组学数据归档和开放共享的数据库平台,是深圳国家基因库的核心功能“三库两平台”中生物信息数据库的对外服务平台,拥有深圳国家基因库丰富的样本资源、数据资源、合作项目资源和强大的数据计算和分析能力等优势。生命科学研究已经进入到了一个以高通量多组学数据为基础的大数据时代,迫切需要加强国际合作和信息共享。随着中国经济的发展和在生命科学研究领域的研究项目投入力度的加大,需要建立相关的生命大数据归档和共享的平台,来促进我国生命科学研究项目中生成的基因组学数据的系统管理、开放共享与合理利用。目前,CNGBdb主要提供生命科学研究相关的数据归档、知识搜索、数据管理、数据计算和数据服务等服务。其归档和共享的数据类型,主要包括项目、样本、实验、测序、组装、变异、序列等。截止2020年5月22号,CNGBdb已接受了全球生命科学科研工作者提交的研究项目达2176个,归档的基因组学数据量超过2221 TB。未来,CNGBdb将继续推动生命科学研究多组学数据的开放共享和产业应用,完善基因组学数据的归档和共享功能,提升其服务生命科学数据开放共享的能力。CNGBdb的网址是:https://db.cngb.org/。

Fe-N-C catalysts for PEMFC: Progress towards the commercial application under DOE reference

Proton exchange membrane fuel cells(PEMFC)have attracted much attention because of their high energy conversion efficiency,high power density and zero emission of pollutants.However,the high cost of the cathode platinum group metal(PGM)catalysts creates a barrier for the large-scale application of PEMFC.Tremendous efforts have been devoted to the development of low-cost PGM-free catalysts,especially the Fe-N-C catalysts,to replace the expensive PGM catalysts.However,the characterization methods and evaluation standards of the catalysts varies,which is not conducive to the comparison of PGM-free catalysts.U.S.Department of energy(DOE)is the only authority that specifies the testing standards and activity targets for PGM-free catalysts.In this review,the major breakthroughs of Fe-N-C catalysts are outlined with the reference of DOE standards and targets.The preparation and characteristics of these highly active Fe-N-C catalysts are briefly introduced.Moreover,the efforts on improving the mass transfer and the durability issue of Fe-N-C fuel cell are discussed.Finally,the prospective directions concerning the comprehensive evaluation of the Fe-N-C catalysts are proposed.

Carbothermic reduction of vanadium titanomagnetite with the assistance of sodium carbonate

The carbothermic reduction of vanadium titanomagnetite concentrate(VTC)with the assistance of Na_(2)CO_(3)was conducted in an argon atmosphere between 1073 and 1473 K.X-ray diffraction and scanning electron microscopy were used to investigate the phase transformations during the reaction.By investigating the reaction between VTC and Na_(2)CO_(3),it was concluded that molten Na_(2)CO_(3)broke the structure of titanomagnetite by combining with the acidic oxides(Fe_(2)O_(3),TiO_(2),Al_(2)O_(3),and SiO_(2))to form a Na-rich melt and release FeO and MgO.Therefore,Na_(2)CO_(3)accelerated the reduction rate.In addition,adding Na_(2)CO_(3)also benefited the agglomeration of iron particles and the slag–metal separation by decreasing the viscosity of the slag.Thus,Na_(2)CO_(3)assisted carbothermic reduction is a promising method for treating VTC at low temperatures.

Tauroursodeoxycholic acid(TUDCA)improves intestinal barrier function associated with TGR5-MLCK pathway and the alteration of serum metabolites and gut bacteria in weaned piglets

Background:Tauroursodeoxycholic acid(TUDCA),a hydrophilic bile acid,is the main medicinal component of bear bile and is commonly used to treat a variety of hepatobiliary diseases.Meanwhile,TUDCA has been shown to modulate the intestinal barrier function and alleviate DSS-induced colitis in mice.However,the effect of TUDCA on the intestinal barrier of weaned piglets remains largely unclear.Methods:The weaned piglets and porcine IPEC-J2 intestinal epithelial cells were used to investigate the effects of TUDCA on intestinal barrier function in weaned piglets and explore the possible underlying mechanisms.In vivo,72 healthy weaned piglets were randomly allocated into 2 groups according to their gender and body weight,and piglets were fed the basal diet with 0(control,CON)and 200 mg/kg TUDCA for 30 d,respectively.Three female and three male piglets reflecting the average bodyweight were slaughtered in each group and samples were collected.In vitro,IPEC-J2 cells were subjected to 100μmol/L TUDCA to explore the possible underlying mechanisms.Results:Our results demonstrated that dietary TUDCA supplementation significantly reduced the diarrhea incidence of weaned piglets,possibly attributing to the TUDCA-enhanced intestinal barrier function and immunity.In addition,TUDCA supplementation altered serum metabolites and the relative abundance of certain gut bacteria,which might contribute to the improved intestinal barrier function.Furthermore,the in-vitro results showed that TUDCA improved the E.coli-induced epithelial barrier impairment of IPEC-J2 cells and increased Takeda G-coupled protein receptor 5(TGR5)protein expression.However,knockdown of TGR5 and inhibition of myosin light chain kinase(MLCK)pathway abolished the TUDCA-improved epithelial barrier impairment in E.coli-treated IPEC-J2 cells,indicating the involvement of TGR5-MLCK in this process.Conclusions:These findings showed that TUDCA improved intestinal barrier function associated with TGR5-MLCK pathway and the alteration of serum metabolites and gut bacteria in weaned piglets,suggesting the potential application of TUDCA in improving gut health in piglet production.

Labeling Malicious Communication Samples Based on Semi-Supervised Deep Neural Network

The limited labeled sample data in the field of advanced security threats detection seriously restricts the effective development of research work.Learning the sample labels from the labeled and unlabeled data has received a lot of research attention and various universal labeling methods have been proposed.However,the labeling task of malicious communication samples targeted at advanced threats has to face the two practical challenges:the difficulty of extracting effective features in advance and the complexity of the actual sample types.To address these problems,we proposed a sample labeling method for malicious communication based on semi-supervised deep neural network.This method supports continuous learning and optimization feature representation while labeling sample,and can handle uncertain samples that are outside the concerned sample types.According to the experimental results,our proposed deep neural network can automatically learn effective feature representation,and the validity of features is close to or even higher than that of features which extracted based on expert knowledge.Furthermore,our proposed method can achieve the labeling accuracy of 97.64%~98.50%,which is more accurate than the train-then-detect,kNN and LPA methodsin any labeled-sample proportion condition.The problem of insufficient labeled samples in many network attack detecting scenarios,and our proposed work can function as a reference for the sample labeling tasks in the similar real-world scenarios.

Study on mass transfer of ethyl acetate in polymer adsorbent by experimental and theoretical breakthrough curves

A new polymeric adsorbent with highly hypercrosslinked structure was developed for the removal of VOCs from polluted air. The purpose of this work is to obtain the intraparticle mass transfer coefficient of the adsorbent particles. Adsorption experiments for obtaining breakthrough curves were carried out with a fixed bed system. A dynamic mathematical model for the fixed bed adsorption system was developed.By model fitting, the overall mass transfer coefficient was determined when the deviation error was minimum. Then, the intraparticle mass transfer coefficient of the adsorbent was determined when the external mass transfer resistance was eliminated at higher velocities. Furthermore, a linear relationship of the intraparticle mass transfer coefficient and equilibrium coefficient at lower inlet gas concentrations range was correlated. Moreover, an equation for predicting external mass transfer coefficient at low Reynolds number range at room temperature was obtained.

Improving the Unconfined Compressive Strength of Red Clay by Combining Biopolymers with Fibers

To explore an environmentally friendly improvement measure for red clay,the function and mechanism of xanthan gum biopolymer and polypropylene fibers on the strength properties of red clay were investigated by unconfined compressive strength and scanning electron microscopy tests.The test results demonstrated that the contents and curing ages of xanthan gum had significant influences on the unconfined compressive strength of red clay.Compared with untreated soil,1.5%xanthan gum content was the optimal ratio in which the strength increment was between 41.52 kPa and 64.73 kPa.On the other hand,the strength of xanthan gum-treated red clay increased,whereas the ductility decreased with the increase in curing ages,indicating that the xanthan gum-treated red clay started to gradually consolidate after 3 days of curing and stiffness significantly improved between 7 and 28 days of curing.The results also showed that the synergistic consolidation effects of the xanthan gum–polypropylene fibers could not only effectively enhance the strength of red clay but also reduce the brittle failure phenomenon.The strengths of soil treated with 2.0%xanthan gum-polypropylene fibers were 1.9–2.41 and 1.12–1.47 times than that of red clay and 1.5%xanthan gum-treated clay,respectively.The results of study provide the related methods and experiences for the field of ecological soil treatment.

Desorption of VOC from polymer adsorbent in multistage fluidized bed

The desorption process of volatile organic compounds(VOC)from a polymer adsorbent in counter-current multistage fluidized bed was studied.And a mathematical model considering the mass transfer dynamics was developed,which was validated from experiment data.The gaseous ethyl acetate mass transfer was discussed,and the limiting step is the intraparticle mass transfer of the desorption process.The value of intraparticle mass transfer coefficient is between 1.85×10-6 and 1.38×10-5 m·s-1 under temperature of 100–160°C.Experiments under different operating conditions were carried out.The effects of operating conditions such as gas–solid flow ratio,gas inlet temperature and total stage number of multistage fluidized bed on outlet VOCs concentration and desorption efficiency were discussed.The maximum outlet VOCs concentration and corresponding desorption efficiency of the multistage fluidized bed desorber was calculated under different gas inlet temperatures and total stage numbers.

CNN-BiLSTM-Attention Model in Forecasting Wave Height over South-East China Seas

Though numerical wave models have been applied widely to significant wave height prediction,they consume massive computing memory and their accuracy needs to be further improved.In this paper,a two-dimensional(2D)significant wave height(SWH)prediction model is established for the South and East China Seas.The proposed model is trained by Wave Watch III(WW3)reanalysis data based on a convolutional neural network,the bidirectional long short-term memory and the attention mechanism(CNNBiLSTM-Attention).It adopts the convolutional neural network to extract spatial features of original wave height to reduce the redundant information input into the BiLSTM network.Meanwhile,the BiLSTM model is applied to fully extract the features of the associated information of time series data.Besides,the attention mechanism is used to assign probability weight to the output information of the BiLSTM layer units,and finally,a training model is constructed.Up to 24-h prediction experiments are conducted under normal and extreme conditions,respectively.Under the normal wave condition,for 3-,6-,12-and 24-h forecasting,the mean values of the correlation coefficients on the test set are 0.996,0.991,0.980,and 0.945,respectively.The corresponding mean values of the root mean square errors are measured at 0.063 m,0.105 m,0.172 m,and 0.281 m,respectively.Under the typhoon-forced extreme condition,the model based on CNN-BiLSTM-Attention is trained by typhooninduced SWH extracted from the WW3 reanalysis data.For 3-,6-,12-and 24-h forecasting,the mean values of correlation coefficients on the test set are respectively 0.993,0.983,0.958,and 0.921,and the averaged root mean square errors are 0.159 m,0.257 m,0.437 m,and 0.555 m,respectively.The model performs better than that trained by all the WW3 reanalysis data.The result suggests that the proposed algorithm can be applied to the 2D wave forecast with higher accuracy and efficiency.

Field monitoring of railroad embankment vibration responses in seasonally frozen regions

To investigate the vibration characteristics of a railway subgrade in different seasons, three field experiments were carried out in the seasonally frozen Daqing area of China during spring, smnmer, and winter. The vibration characteristics and attenuation rates of the subgrade induced by passing trains were investigated, and the influences of the season, train speed, train type, train load, and number of train compartments are described in this paper. The results show that： （1） near the rail track the vibration in the vertical direction was more significant than in the lateral and longitudinal directions, and as the distance from the railway track increased, the acceleration amplitudes and the attenuation rates all decreased in all three directions; （2） the acceleration amplitudes and at- tenuation rates decreased in the three different study seasons as the distance from the railway track increased, and the attenuation rates in the freezing period were the largest; and （3） the acceleration amplitude induced by a freight train was greater than that by a passenger train, and the subgrade vibration increased with increasing passenger train speeds when the number of train compart- ments was similar. These results have great significance for enhanced understanding of the characteristics of wain-induced vibra- tion embankment response in seasonally frozen regions, and provide essential field monitoring data on train-induced vibrations in order to improve the performance criteria of railroading in seasonally frozen regions.

Effect and mechanism of CyPA in radiosensitization of lung adenocarcinoma using CRISPR/Cas9 technology

Objective:To explore the role of cyclophilin A(CyPA)in sensitization of lung adenocarcinoma to radiotherapy using CRISPR/Cas9 technology.Methods:A CyPA knockout human lung adenocarcinoma cell line H1975 was established by CRISPR/Cas9 technology.Groups included a control group(wildtype),CyPA knockout group,traditional Chinese medicine(TCM)extract with Fuzhengzengxiao decoction group,and TCM extract with Fuzhengzengxiao decoction t CyPA knockout group.Each group was exposed to radiation at doses of 0,2,4,6,and 8 Gy.After 24 h,MTT assays were used to determine the survival rate of lung cancer cells and calculate radiosensitivity.The qPCR was used to measure mRNA expression of DDIT3,CDKN1A,and CDC25A associated with DNA damage repair.Results:Without irradiation,Fuzhengzengxiao decoction reduced the survival rate of lung adenocarcinoma cells(P<.0001).After irradiation,TCM extract with Fuzhengzengxiao decoction,CyPA knockout,and TCM extract with Fuzhengzengxiao decoction t CyPA knockout groups had reduced survival rates(P<.0001)and radiosensitivity was increased significantly.Expression of DDIT3,CDKN1A,and CDC25A was upregulated after knockout of CyPA(P<.0001).Expression of DDIT3 and CDC25A was increased after irradiation in wildtype cells treated with TCM extract with Fuzhengzengxiao decoction(DDIT3,P<.0001;CDC25A,P紏.0059).The TCM extract with Fuzhengzengxiao decoction t CyPA knockout group also had increased expression of DDIT3 and CDC25A after irradiation(P<.0001).Conclusion:Fuzhengzengxiao decoction significantly decreases the survival rate of lung cancer cells,and its mechanism may be related to radiosensitization by decreasing expression of CyPA and inducing G1/S cell cycle arrest.