Long non-coding RNA H19 regulates neurogenesis of induced neural stem cells in a mouse model of closed head injury

Stem cell-based therapies have been proposed as a potential treatment for neural regeneration following closed head injury.We previously reported that induced neural stem cells exert beneficial effects on neural regeneration via cell replacement.However,the neural regeneration efficiency of induced neural stem cells remains limited.In this study,we explored differentially expressed genes and long non-coding RNAs to clarify the mechanism underlying the neurogenesis of induced neural stem cells.We found that H19 was the most downregulated neurogenesis-associated lnc RNA in induced neural stem cells compared with induced pluripotent stem cells.Additionally,we demonstrated that H19 levels in induced neural stem cells were markedly lower than those in induced pluripotent stem cells and were substantially higher than those in induced neural stem cell-derived neurons.We predicted the target genes of H19 and discovered that H19 directly interacts with mi R-325-3p,which directly interacts with Ctbp2 in induced pluripotent stem cells and induced neural stem cells.Silencing H19 or Ctbp2 impaired induced neural stem cell proliferation,and mi R-325-3p suppression restored the effect of H19 inhibition but not the effect of Ctbp2 inhibition.Furthermore,H19 silencing substantially promoted the neural differentiation of induced neural stem cells and did not induce apoptosis of induced neural stem cells.Notably,silencing H19 in induced neural stem cell grafts markedly accelerated the neurological recovery of closed head injury mice.Our results reveal that H19 regulates the neurogenesis of induced neural stem cells.H19 inhibition may promote the neural differentiation of induced neural stem cells,which is closely associated with neurological recovery following closed head injury.

Factors Associated with Closely Spaced Pregnancies at the Departmental Hospital Centre of Zou-Collines (Benin) in 2022

Introduction: Birth spacing to prevent closely-spaced pregnancies, which are a source of maternal and neonatal morbidity and mortality, is not always respected by our women, as recommended by the World Health Organization (WHO). The objective was to study the factors associated with closely-spaced pregnancies among women followed at the Departmental Hospital Center du Zou et du Colline (DHC/Z-C) in 2022. Study Method: This was a descriptive, analytical cross-sectional study with prospective data collection from 20 May to 30 June 2022. Results: At the end of the study, 83 of the 117 women surveyed had close pregnancies, a frequency of 70.94%. They had an average age of 27.0 ± 6.3 years and were of Fon ethnicity and related in 91.57% of cases. The majority were married (96.60%). The factors significantly associated with these closely spaced pregnancies were age between 25 and 30 years, household occupation, age at first birth, age at marriage, women’s perception of contraceptive method (CM), women’s knowledge of the existence of a center providing family planning services and non-use of MC. Conclusion: Close pregnancies are still very common in the commune of Abomey. It is therefore important to increase the use of contraceptive methods in this part of the country.

Formation of a Rapidly Rotating Classical Be-star in a Massive Close Binary System

This paper investigates the spin-up of a mass-accreting star in a close binary system passing through the first stage of mass exchange in the Hertzsprung gap. Inside an accreting star, angular momentum is carried by meridional circulation and shear turbulence. The circulation carries part of the angular momentum of the accreted layers to the accretor's surface. The greater the rate of arrival of angular momentum in the accretor is, the greater this part. It is assumed that this part of the angular momentum can be removed by the disk further from the accretor. If the angular momentum in the matter entering the accretor is more than half the Keplerian value, then the angular momentum obtained by the accretor during mass exchange stage does not depend on the rate of arrival of angular momentum. The accretor may have the characteristics of a Be-star immediately after the end of mass exchange.

Design and Test of Closed Hydraulic Transmission System of 4WD High-clearance Wheeled Sprayer

In conjunction with the working characteristics of the high-clearance wheeled sprayer and the benefits of the closed hydraulic system,a series of reasonable working parameters should be established,and a hydraulic system that fulfills the requisite specifications should be designed.The AMESim software model is employed to construct a closed hydraulic transmission system,and the simulation analysis is then performed according to the data of hydraulic components.According to analysis results,the prototype can be optimized and upgraded,and a verification test is further carried out.The test results demonstrate that the designed closed hydraulic transmission system meets the actual working requirements of the high-clearance wheeled sprayer and provides a stable experimental platform for intelligent control of agricultural machinery.

Design and analysis of an advanced thermal management system for the solar close observations and proximity experiments spacecraft

In this paper,the mission and the thermal environment of the Solar Close Observations and Proximity Experiments(SCOPE)spacecraft are analyzed,and an advanced thermal management system(ATMS)is designed for it.The relationship and functions of the integrated database,the intelligent thermal control system and the efficient liquid cooling system in the ATMS are elaborated upon.For the complex thermal field regulation system and extreme space thermal environment,a modular simulation and thermal field planning method are proposed,and the feasibility of the planning algorithm is verified by numerical simulation.A solar array liquid cooling system is developed,and the system simulation results indicate that the temperatures of the solar arrays meet the requirements as the spacecraft flies by perihelion and aphelion.The advanced thermal management study supports the development of the SCOPE program and provides a reference for the thermal management in other deep-space exploration programs.

Study on the Effect of Behavioral Interventions Based on the Theory of“Knowledge,Attitude,Practice”on Tuberculosis Cognitive Level of Close Contacts

Objective:Based on the theory of“Knowledge,Attitude,Practice,”health education was carried out for close contact with tuberculosis(TB)at a university in Beijing,and its impact on the students’awareness of TB was studied.This study could provide a reference for effective health education interventions among close contacts of TB in undergraduates.Methods:102 undergraduates who had close contact with one confirmed case of pulmonary TB in April 2021 at a university were randomly divided into a control group and an intervention group.The intervention group was given the“Knowledge,Attitude,Practice”health education intervention by professionally trained doctors,and were asked to complete a self-designed TB-related questionnaire before and after the intervention.Both groups performed the Tuberculin Skin Test(TST)and chest X-ray(CR)examination.Results:The rate of the TST test was 18.6%,and CR examination showed 0 cases of pulmonary TB.The survey results showed that the TB awareness rate(96.1%,49/51)in the intervention group was significantly higher than that of the control group(51.0%,26/51),and the differences in awareness rate between the two groups were statistically significant(P<0.05).Regarding the attitude/skills toward TB,the prevalence rate of tuberculosis-related attitude/behavior in the intervention group(94.1%,47/51)was significantly higher than that of the control group(60.8%,31/51),and the differences between the two groups were statistically significant(P<0.05).Conclusion:Both self-controlled and parallel-controlled studies showed that the health education intervention of“Knowledge,Attitude,Practice”improved the awareness of TB among close contacts of TB in undergraduates.

Effect of periodic wide atmospheric pressure change on CO emission in closed goaf

Atmospheric pressure fuctuation is one of the most important factors afecting the climate environment and gas emission in the fre area.To obtain the infuence rule of the surface atmospheric pressure change on the gas sampling and abnormal emission in the mine closed goaf,the No.1 coal mine in Dananhu was taken as the research object.Using Fourier transform and Fisher harmonic analysis and other statistical methods,the infuence of the periodic variation of atmospheric pressure on the gas leakage and outfow in the closed goaf was studied.The results showed that there were three atmospheric pressure periods of 15.2 d,1 d and 182.2 d,and the probability was greater than 95%.The time period with the highest number of atmospheric pressure peaks was 7:00–8:00,which accounted for 20.2%of total occurrence number in a day.And the time periods with the highest number of atmospheric pressure trough were 2:00,15:00 and 16:00,accounting for 27.4%.The peak-to-trough transition time was mainly concentrated around 6 h,and the diurnal variation curve of atmospheric pressure was mainly bimodal.The atmospheric pressure change rate was mostly concentrated in 10–50 Pa/h.It was determined that the distance that the gas sampling pipe was pre-laid into the inner side of the closed wall should be greater than 44.4 m,and the CO concentration and atmospheric pressure in the closed goaf were both periodic and negative with atmospheric pressure.The research results have important guiding signifcance for the monitoring,early warning and environmental protection of the goaf.

Performance analyses of two-phase closed thermosyphons for road embankments in the high-latitude permafrost regions

Two-phase closed thermosyphons(TPCTs)are widely used in infrastructure constructions in permafrost regions.Due to different climatic conditions,the effectiveness of TPCT will also be different,especially in the extremely cold region of the Da Xing'anling Mountains.In this study,a series of three-dimensional finite element TPCT embankment models were established based on the ZhanglingMohe highway TPCT test section in Da Xing'anling Mountains,and the thermal characteristics and the cooling effect of the TPCTs were analyzed.The results indicated that the TPCTs installed in the northeastern high-latitude regions is effective in cooling and stabilizing the embankment.The working cycle of the TPCTs is nearly 7 months,and the cooling range of the TPCTs can reach 3 m in this region.However,due to the extremely low temperature,the TPCT generates a large radial gradient in the permafrost layer.Meanwhile,by changing the climate conditions,the same type of TPCT embankment located in the Da Xing'anling Mountains,the Xiao Xing'anling Mountains,and the Qinghai-Tibet Plateau permafrost regions were simulated.Based on the comparison of the climate differences between the Qinghai-Tibet Plateau and Northeast China,the differences in the effectiveness of TPCTs were studied.Finally,the limitations of using existing TPCTs in high-latitude permafrost regions of China were discussed and the potential improvements of the TPCT in cold regions were presented.

Closed corner divertor with B×▽B away from the divertor:a promising divertor scenario for tokamak power exhaust

A major challenge facing the steady-state operation of tokamak fusion reactors is to develop a viable divertor solution with order-of-magnitude increase in power handling capability as compared with present experience.A recently developed divertor concept for this end has been tested recently on EAST tokamak through combining the effects of a closed divertor corner and E×B drifts.The E×B drifts in the divertor move particles towards the outer divertor corner area in the scrape-off layer for B×▽B directed away from the divertor,which can significantly enhance the particle concentration there,facilitating divertor detachment.In recent EAST experiments,the effects have been demonstrated where the lowest electron temperature at the divertor plate is obtained with strike point located close to the corner in the horizontal target and with B×▽B away from the divertor.These experimental results are in reasonable agreement with SOLPS-ITER simulations including drift effects,suggesting that the new divertor concept potentially provides a promising divertor solution for long-pulse operations of future tokamak fusion reactors with much higher power fluxes.

Parameter Design of Current Double Closed Loop for T-Type Three-Level Grid-Connected Inverter

To reduce current harmonics caused by switching frequency,T-type grid-connected inverter topology with LCL filter is adopted.In view of the disadvantages of the slow response speed of the traditional current control and the failure to eliminate the influence of the LCL filter on the grid-connected current by using current PI control alone,a current double closed loop PI current tracking control is proposed.Through the theoretical analysis of the grid-connected inverter control principle,the grid-connected inverter control model is designed,and the transfer functionmodel of each control link is deduced,and the current loop PI regulator is designed at last.The simulation results show that the control strategy is feasible.

Application of Opening and Closing Morphology in Deep Learning-Based Brain Image Registration

In order to improve the registration accuracy of brain magnetic resonance images(MRI),some deep learning registration methods use segmentation images for training model.How-ever,the segmentation values are constant for each label,which leads to the gradient variation con-centrating on the boundary.Thus,the dense deformation field(DDF)is gathered on the boundary and there even appears folding phenomenon.In order to fully leverage the label information,the morphological opening and closing information maps are introduced to enlarge the non-zero gradi-ent regions and improve the accuracy of DDF estimation.The opening information maps supervise the registration model to focus on smaller,narrow brain regions.The closing information maps supervise the registration model to pay more attention to the complex boundary region.Then,opening and closing morphology networks(OC_Net)are designed to automatically generate open-ing and closing information maps to realize the end-to-end training process.Finally,a new registra-tion architecture,VM_(seg+oc),is proposed by combining OC_Net and VoxelMorph.Experimental results show that the registration accuracy of VM_(seg+oc) is significantly improved on LPBA40 and OASIS1 datasets.Especially,VM_(seg+oc) can well improve registration accuracy in smaller brain regions and narrow regions.

Meta-analysis of the efficacy of volar plate internal fixation versus closed reduction and external fixation in the treatment of adult distal radius fractures

Objective:To compare the efficacy of open reduction and volar locking plate internal fixation with closed reduction and external fixation in the treatment of distal radius fractures by using meta analysis.Methods:The databases of CNKI,Wanfang,Weipu,Chinese biomedical literature,Pubmed,Embase,and Cochrane Library were retrieved,and the randomized controlled studies that directly compared the efficacy of plate internal fixation and closed reduction external fixation in the treatment of distal radius fractures published publicly from the establishment of the database to April 2023 were collected.The two researchers independently screened the retrieved literature according to the inclusion and exclusion criteria,extracted data,used Cochrane risk bias assessment tool for quality assessment,and used RevMan 5.4 software for meta analysis.Results:A total of 10 randomized controlled trials were included,all of which were in English.There were 1042 patients in total,and 9 of them were rated as low risk.Meta analysis results showed that one year after the treatment of distal radius fracture with volar locking plate internal fixation,DASH score[MD=-5.64,95%CI(-7.21,-4.06),P<0.00001];One year later,PRWE score[MD=-5.90,95%CI(-8.88,-2.92),P=0.001];Palm flexion[MD=5.92,95%CI(1.29,10.55),P=0.01];Pronation[MD=2.48,95%CI(0.59,4.36),P=0.01];Postrotation[MD=4.73,95%CI(2.15,7.31),P=0.0003];Grip strength[MD=0.61,95%CI(0.12,1.10),P=0.02];palmar tilt angle[MD=9.84,95%CI(5.66,14.02),P<0.00001];Radial inclination[MD=4.33,95%CI(2.97,5.69),P<0.00001]was superior to closed reduction plaster or splint external fixation.One year later,the European Five dimensional Health Scale(EQ-5D-5L)score[MD=0.02,95%CI(-0.01,0.05),P=0.27];Back extension[MD=2.22,95%CI(-4.15,8.59),P=0.49];Ulnar deviation[MD=3.49,95%CI(-0.80,7.78),P=0.11];Radial deviation[MD=2.05,95%CI(-2.39,6.50),P=0.37];Ulnar variance[MD=-1.14,95%CI(-3.16,0.88),P=0.27];There was no significant difference in complications[MD=0.77,95%CI(0.54,1.10),P=0.16](P>0.05).Conclusion:Based on the current clinical data,internal fixation with volar locking plate is more conducive to mid-term DASH score and grip strength recovery than closed reduction plaster or splint external fixation,but there is no significant difference in the quality of life and complications of patients.For adult distal radius fractures,surgical indications should be carefully grasped,and non operative treatment should be given priority.

Speckle-interferometric Study of Close Visual Binary System HIP 11253(HD 14874)using Gaia(DR2 and EDR3)

We present a comprehensive set of physical and geometrical parameters for each of the components of the close visual binary system HIP 11253(HD 14874).We present an analysis for the binary and multiple stellar systems with the aim to obtain a match between the overall observational spectral energy distribution of the system and the spectral synthesis created from model atmospheres using Al-Wardat's method for analyzing binary and multiple stellar systems.The epoch positions are used to determine the orbital parameters and the total mass.The parameters of both components are derived as:T_(eff)^(a)=6025,T_(eff)^(b)=4710,logg_(a)=4.55,logg_(b)=4.60,R_(a)=1.125 R_(⊙),R_(b)=0.88R_(⊙),L_(a)=1.849 L_(⊙),L_(b)=0.342 L_(⊙).Our analysis shows that the spectral types of the components are F9 and K3.By combining the orbital solution with the parallax measurements of Gaia DR2 and EDR3,we estimate the individual masses using the H-R diagram as M_(a)=1.09 M_(⊙)and M_(b)=0.59 M_(⊙)for using Gaia DR2 parallax and M_(a)=1.10 M_(⊙)and M_(b)=0.61 M_(⊙)for using Gaia EDR3 parallax.Finally,the location of both system's components on the stellar evolutionary tracks is presented.

Closed-Loop System Identification Approach of the Inertial Models

The mathematical model that approximates the dynamics of the industrial process is essential for the efficient synthesis of control algorithms in industrial applications. The model of the process can be obtained according to the identification procedures in the open-loop, or in the closed-loop. In the open-loop, the identification methods are well known and offer good process approximation, which is not valid for the closed-loop identification, when the system provides the feedback output and doesn’t permit it to be identified in the open-loop. This paper offers an approach for experimental identification in the closed-loop, which supposes the approximation of the process with inertial models, with or without time delay and astatism. The coefficients are calculated based on the values of the critical transfer coefficient and period of the underdamped response of the closed-loop system with P controller, when system achieves the limit of stability. Finally, the closed-loop identification was verified by the computer simulation and the obtained results demonstrated, that the identification procedure in the closed-loop offers good results in process of estimation of the model of the process.

实验用大林姬鼠种群微卫星标记开发及遗传特性分析

目的 开发大林姬鼠多态性微卫星标记,丰富大林姬鼠遗传数据,为大林姬鼠遗传质量控制及基因定位等工作奠定基础。方法 基于大林姬鼠基因组序列筛选微卫星位点,挖掘微卫星引物,通过多重PCR技术分析群体的遗传多样性。结果 成功开发出30个微卫星标记,利用60份大林姬鼠基因组DNA对30个微卫星位点进行评价,共检测出152个等位基因,平均每个位点有5.067个等位基因;平均观察杂合度为0.592;平均香农指数为1.265;平均多态信息含量为0.598。结论 基于本研究所开发的微卫星位点具有较好的多态性,能有效分析大林姬鼠群体的遗传多样性,适合为建立大林姬鼠遗传质量标准和遗传质量检测方法奠定基础。

现代食品微生物学课程教学改革初探

现代食品微生物学是食品科学与工程专业的核心必修课程,是食品专业教学体系中的一门重要课程。针对目前课程教学中存在的教学内容陈旧、教学方式单一、教学考核方式不够科学等问题,教学团队开展了教学改革研究。将食品微生物时事热点案例引入课堂以更新教学内容,鼓励学生在课堂上进行微生物专题研讨展示,在“作业提交-评阅打分”后增加反馈、互动环节,实现教学闭环。经过3轮教学改革实践,学生的教学反馈良好,现代食品微生物学的教学效果得到明显提升。

接触器低速大吸力合闸优化控制策略

为了更好地抑制接触器合闸触头弹跳,提出一种控制策略以优化合闸过程。首先,利用线圈电压与电流作为输入构建参数观测器,实时观测接触器的动态吸力、弹簧反力、动铁心速度及位移。在此基础上,构造双闭环控制结构,外环采用模糊控制逐次调节超程前吸力裕量,内环将吸力裕量与实时弹簧反力叠加用作参考吸力,进行吸力闭环控制,实现外环动铁心合闸速度的逐次迭代优化。将观测位移与触头开距进行实时比较,一旦动铁心运动到超程阶段时,增大吸力参考,使电磁吸力快速增加,实现触头的低速大吸力合闸,以压制动铁心反弹,尽量抑制触头弹跳,并兼顾可靠合闸。通过仿真与实验验证了方案的可行性,该控制策略对依靠电磁力进行操动的电磁及永磁开关的合闸优化具有一定意义。

盘锦市夏季高温闷棚土壤消毒技术

通过盘锦市部分农户反映问题和长期生产调研,发现盘锦市部分农户种植的温室内由于长期连作及不科学的病虫害防治方式,导致温室内病虫害极为严重,尽管当地农户采用多种防治手段,温室内病虫害始终难以根除。为解决这一生产难题,2022—2023年辽宁省农业科学院蔬菜研究所与当地农户对接,在盘锦市菜根堂培训基地农户种植的温室内进行了夏季高温闷棚土壤消毒试验。为加强防治效果,试验增加了不同剂量的石灰氮和98%棉隆颗粒进行了不同组合处理。结果显示,35 g/m^(2)98%棉隆颗粒+135 g/m^(2)石灰氮高温闷棚土壤消毒效果最好,但35 g/m^(2)98%棉隆颗粒+105 g/m^(2)石灰氮高温闷棚土壤消毒防治效果和成本投入最易为农户接受。

老年髋关节置换术中实施丙泊酚闭环靶控输注麻醉的效果及对患者术后谵妄风险的影响

目的研究老年髋关节置换术中实施丙泊酚闭环靶控输注麻醉的效果及对术后谵妄风险的影响。方法回顾性选取2020年1月至2023年1月入安庆市第一人民医院接受治疗的90例髋关节骨折老年患者,择期行髋关节置换术。参考麻醉方式不同分为A组、B组和C组,每组各30例。A组给予丙泊酚闭环靶控持续输注麻醉,B组给予丙泊酚开环靶控持续输注麻醉,C组给予丙泊酚人工持续输注麻醉。比较3组患者的术中相关指标(麻醉时间、手术时间以及拔管时间)、麻醉相关指标(术中丙泊酚总计用量、术中维持泵调节次数)、血流动力学变化[麻醉诱导开始(T_(0))、插管(T_(1))、手术开始(T_(2))、手术结束(T_(3))、拔管(T_(4))的平均动脉压、心率以及脑电双频指数(BIS)值]情况、术后恢复情况及术后谵妄发生情况。结果(1)术中指标:3组患者麻醉时间、手术时间以及拔管时间比较,差异均无统计学意义(P>0.05)。(2)麻醉相关指标:A组患者术中丙泊酚总计用量、术中维持泵调节次数均明显低于B、C组,差异均有统计学意义(P<0.05);B组患者单位麻醉时间内丙泊酚用量、单位手术时间内丙泊酚用量均明显高于A、C组,差异均有统计学意义(P<0.05)。(3)血流动力学:A组T_(2)、T_(3)时平均动脉压均高于B组、C组,A组T_(4)时的平均动脉压更加接近于T_(0);3组患者不同时刻心率差异无统计学意义(P>0.05);A组T_(2)、T_(3)时BIS值均低于B组、C组,差异均有统计学意义(P<0.05)。(4)术后恢复情况:A组患者PACU停滞时间、自主呼吸恢复时间、指令反应恢复时间均明显低于B、C组,差异均有统计学意义(P<0.05)。(5)术后谵妄:A组患者术后谵妄发生率为16.67%,显著低于B、C组(40.00%、46.67%),差异均有统计学意义(P<0.05)。结论老年髋关节置换术中采用丙泊酚靶控输注麻醉可减少丙泊酚用量,术中生命体征更加平稳,可降低人工操作次数,术后麻醉苏醒更快,且术后谵妄发生率也更低,是老年患者首选的麻醉方案。

关闭/废弃矿井抽水蓄能开发利用现状与进展

探索清洁能源发展的创新途径是实现我国“双碳”目标的重要推动力。为解决大规模可再生能源电力供应不稳定的难题,新型电力系统的提出与加速成长促进了抽水蓄能电站的建设与发展,但生态保护与地形等因素制约了传统抽水蓄能电站发展。关闭/废弃矿井,由于具有丰富的地下空间及水资源,可创新性地开发抽水蓄能并延长矿区的经济寿命,降低对环境与经济的负面影响。为助力建立适合我国国情的废弃矿井抽水蓄能利用模式和管理体系,通过文献分析法综述了国内外废弃矿井抽水蓄能技术研究与应用进展。详细阐述了关闭/废弃矿井抽水蓄能技术原理、分类及其优缺点;总结了关闭/废弃矿井抽水蓄能电站利用模式,并在前人研究基础上对选址要素进行了修订;梳理了关闭/废弃矿井改建抽水蓄能电站的水-气两相流动特性、水泵水轮机工况特性、地下空间围岩稳定性及地下蓄水空间体积测算等的研究现状,明确了水泵-水轮机关键技术、地下空间稳定性控制关键技术等亟待解决的技术难题。此外,对关闭/废弃矿井抽水蓄能相关的生态与环境保护、市场需求与经济效益、政策与法规等研究成果进行了广泛的文献综述。发展关闭/废弃矿井地下空间抽水蓄能技术可为我国井下空间资源利用提供思路,为保障国家能源安全与经济社会高质量发展提供新途径。