Practical Prescribed Time Tracking Control With Bounded Time-Varying Gain Under Non-Vanishing Uncertainties

This paper investigates the prescribed-time control(PTC) problem for a class of strict-feedback systems subject to non-vanishing uncertainties. The coexistence of mismatched uncertainties and non-vanishing disturbances makes PTC synthesis nontrivial. In this work, a control method that does not involve infinite time-varying gain is proposed, leading to a practical and global prescribed time tracking control solution for the strict-feedback systems, in spite of both the mismatched and nonvanishing uncertainties. Different from methods based on control switching to avoid the issue of infinite control gain that involves control discontinuity at the switching point, in our method a softening unit is exclusively included to ensure the continuity of the control action. Furthermore, in contrast to most existing prescribed-time control works where the control scheme is only valid on a finite time interval, in this work, the proposed control scheme is valid on the entire time interval. In addition, the prior information on the upper or lower bound of gi is not in need,enlarging the applicability of the proposed method. Both the theoretical analysis and numerical simulation confirm the effectiveness of the proposed control algorithm.

Dynamic Constraint-Driven Event-Triggered Control of Strict-Feedback Systems Without Max/Min Values on Irregular Constraints

This work proposes an event-triggered adaptive control approach for a class of uncertain nonlinear systems under irregular constraints.Unlike the constraints considered in most existing papers,here the external irregular constraints are considered and a constraints switching mechanism(CSM)is introduced to circumvent the difficulties arising from irregular output constraints.Based on the CSM,a new class of generalized barrier functions are constructed,which allows the control results to be independent of the maximum and minimum values(MMVs)of constraints and thus extends the existing results.Finally,we proposed a novel dynamic constraint-driven event-triggered strategy(DCDETS),under which the stress on signal transmission is reduced greatly and no constraints are violated by making a dynamic trade-off among system state,external constraints,and inter-execution intervals.It is proved that the system output is driven to close to the reference trajectory and the semi-global stability is guaranteed under the proposed control scheme,regardless of the external irregular output constraints.Simulation also verifies the effectiveness and benefits of the proposed method.

Achieving Given Precision Within Prescribed Time yet With Guaranteed Transient Behavior via Output Based Event-Triggered Control

It is interesting yet nontrivial to achieve given control precision within user-assignable time for uncertain nonlinear systems.The underlying problem becomes even more challenging if the transient behavior also needs to be accommodated and only system output is available for feedback.Several key design innovations are proposed to circumvent the aforementioned technical difficulties,including the employment of state estimation filters with event-triggered mechanism,the construction of a novel performance scaling function and an error transformation.In contrast to most existing performance based works where the stability is contingent on initial conditions and the maximum allowable steady-state tracking precision can only be guaranteed at some unknown(theoretically infinite)time,in this work the output of the system is ensured to synchronize with the desired trajectory with arbitrarily pre-assignable convergence rate and arbitrarily pre-specified precision within prescribed time,using output only with lower cost of sensing and communication.In addition,all the closed-loop signals are ensured to be globally uniformly bounded under the proposed control method.The merits of the designed control scheme are confirmed by numerical simulation on a ship model.

Practical prescribed-time tracking control for uncertain strict-feedback systems with guaranteed performance under unknown control directions

In this paper,we consider the practical prescribed-time performance guaranteed tracking control problem for a class of uncertain strict-feedback systems subject to unknown control direction.Due to the existence of unknown nonlinearities and uncertainties,it is challenging to design a controller that can ensure the stability of closed-loop system within a predetermined finite time while maintaining the specified transient performance.The underlying problem becomes further complex as the control directions are unknown.To deal with the above problems,a special translation function as well as Nussbaum type function are introduced in the prescribed performance control(PPC)framework.Finally,a PPC as well as preset finite time tracking control scheme is designed,and its effectiveness is confirmed by both theoretical analysis and numerical simulation.

From concept to reality-A review to the primary test stand and its preliminary application in high energy density physics

Pulsed power technology,whereas the electrical energy stored in a relative long period is released in much shorter timescale,is an efficient method to create high energy density physics(HEDP)conditions in laboratory.Around the beginning of this century,China Academy of Engineering Physics(CAEP)began to build some experimental facilities for HEDP investigations,among which the Primary Test Stand(PTS),a multi-module pulsed power facility with a nominal current of 10 MA and a current rising time~90 ns,is an important achievement on the roadmap of the electro-magnetically driven inertial confinement fusion(ICF)researches.PTS is the first pulsed power facility beyond 10 TW in China.Therefore,all the technologies have to be demonstrated,and all the engineering issues have to be overcome.In this article,the research outline,key technologies and the preliminary HEDP experiments are reviewed.Prospects on HEDP research on PTS and pulsed power development for the next step are also discussed.

Quantitative features of myoelectric signals in the orbicularis oculi muscle during different motion states

Artificial facial nerve prostheses are thought to restore eye-closed function in peripheral facial paralysis patients.At present,however,there is no adequate quantitative or qualitative information regarding myoelectric signal（MES）features for healthy orbiculads oculi muscle（OOM）.The present study analyzed MES features of normal OOM in rabbits during the natural continuous eye-opening（N1）state,natural continuous eye-closing（N2）state,natural blink（N3）state,and evoked eye-closing（E）state according to time domain and frequency domain analysis.Results showed that OOM electrical activities in N1 and N2 states,as well as myoelectric amplitude,were low and stable.Nevertheless,during N3 and E states,OOM electrical activities were significantly increased and amplitude was much higher in the E state than in the N3 state.In the time domain,differences in MES peak absolute potential were not significant between N1 and N2 states,in the frequency domain,differences in power spectral density peak frequency of electromyogram signals were significant between two sets of four OOM movement states.These results suggest that OOM significantly contracts and induces eyelid-closing action.In addition,OOM is diastolic during the N1state.A N2 state does not require continuous intensive OOM contraction.Moreover,distinctions of quantitative information in time and frequency domain features of MES can be used as an OOM reference to identify muscle movement patterns.

Artificial facial nerve reflex restores eyelid closure following orbicularis oculi muscle denervation

To date, treatment of peripheral facial paralysis has focused on preservation of facial nerve integrity. However, with seriously damaged facial nerve cases, it is difficult to recover anatomical and functional integrity using present therapies. Therefore, the present study utilized artificial facial nerve reflex to obtain orbicularis oculi muscle （OOM） electromyography signals on the uninjured side through the use of implanted recording electrodes. The implanted electrical chips analyzed facial muscle motion on the uninjured side and triggered an electrical stimulator to emit current pulses, which resulted in stimulation of injured OOM contraction and maintained bilateral symmetry and consistency. Following signal recognition, extraction, and computer analysis, electromyography signals in the uninjured OOM resulted in complete eyelid closure, which was consistent with the voltage threshold for eye closure. These findings suggested that artificial facial nerve reflex through the use of implanted microelectronics in unilateral peripheral facial paralysis could restore eyelid closure following orbicularis oculi muscle denervation.

“目标-平台-评价”课程思政教学模式的探索与实践——以无机化学为例

在多年无机化学教学实践基础上,我们提出了“目标-平台-评价”课程思政教学模式。该教学模式以教学目标为统领,在教学过程中围绕教学目标的落实搭建了课堂、活动与媒体多种实现平台,平台的多样性保证了课程思政教学目标的多渠道灵活实现。为了实现课程评价对教学过程的导向作用,课程评价中采用形成性评价与总结性评价相结合,强调学科知识评价与思政知识评价相结合,使课程思政教学目标落到实处。

Bta-miR-34b controls milk fat biosynthesis via the Akt/mTOR signaling pathway by targeting RAI14 in bovine mammary epithelial cells

Background:The biosynthesis of milk fat affects both the technological properties and organoleptic quality of milk and dairy products.MicroRNAs(miRNAs)are endogenous small non-coding RNAs that inhibit the expression of their mRNA targets and are involved in downstream signaling pathways that control several biological processes,including milk fat synthesis.miR-34b is a member of the miR-34 miRNA cluster,which is differentially expressed in the mammary gland tissue of dairy cows during lactation and dry periods.Previous studies have indicated miR-34b is a potential candidate gene that plays a decisive role in regulating milk fat synthesis;therefore,it is important to focus on miR-34b and investigate its regulatory effect on the biosynthesis of milk fat in bovine mammary epithelial cells(BMECs).Results:In this study,elevated miR-34b levels reduced milk fat synthesis,upregulated 1,999 genes,and downregulated 2,009 genes in BMECs.Moreover,Kyoto Encyclopedia of Genes and Genomes(KEGG)analysis of differentially expressed genes suggested that miR-34b may play an inhibitory role in milk fat synthesis via the protein kinase B(Akt)/mammalian target of rapamycin(mTOR)signaling pathway by reducing phosphorylation levels.Notably,the mTOR activator MHY1485 rescued the inhibitory effect of miR-34b.Furthermore,we demonstrated that retinoic acid-induced protein 14(RAI14)is a target of miR-34b via TargetScan and immunofluorescence assays.RAI14 mRNA and protein levels were significantly decreased by the miR-34b mimic and increased by the miR-34b inhibitor.Moreover,the reduction in RAI14 levels led to the inhibition of the Akt/mTOR signaling pathway.Conclusions:Overall,our results identified a miR-34b-RAI14-Akt/mTOR regulatory network,while also providing a theoretical basis for the molecular breeding of dairy cows.

Case 01-2017-Primary vitreoretinal lymphoma(PVRL):report of a case and update of literature from 1942 to 2016

Primary vitreoretinal lymphoma (PVRL), as a subset of primary central nervous system lymphoma (PCNSL), is a rare and fatal ocular malignancy. Most PVRL masquerades as chronic posterior uveitis, which makes the clinical diagnosis challenging. Vitreous cells, subretinal lesions and imaging techniques are essential for clinical diagnosis. Importantly, cytopathology/histopathology identification of malignant cells is the gold standard for the diagnosis of PVRL. In addition, molecular detection of immunoglobulin heavy chain (IgH) or T cell receptor (TCR) gene rearrangements, immunophenotyping for cell markers, and cytokine analysis of interleukine-10 elevation are often used as adjunct procedures. Current management of PVRL involves local radiation, intravitreal chemotherapy (methotrexate and rituximab), with or without systemic chemotherapy depending on the involvement of non-ocular tissues. In cases with concomitant PCNSL, systemic high-dose methotrexate/rituximab based therapy in conjunction with local therapy, whole brain radiotherapy and/or autologous stem cell transplantation is considered. Although PVRL normally responds well to initial treatment, high rates of relapse and CNS involvement usually lead to poor prognosis and limited survival. A professional team of medical experts in ophthalmologists, ocular pathologists, neuro-oncologists and hemato-oncologists is essential for optimizing patient management.

原发性玻璃体视网膜淋巴瘤:个案报告及1942至2016年文献回顾

原发性玻璃体视网膜淋巴瘤(primary vitreoretinal lymphoma,PVRL)作为原发性中枢神经系统淋巴瘤(primary central nervous system lymphoma,PCNSL)的一个亚型,是一种罕见的致命性眼部恶性肿瘤。多数PVRL会伪装成慢性后葡萄膜炎,这使得临床诊断具有挑战性。玻璃体细胞、视网膜下液和影像学检查对临床诊断至关重要。而对恶性细胞的细胞学检查与组织病理学诊断是PVRL诊断的金标准。此外,免疫球蛋白重链(immunoglobulin heavy chain,IgH)或T细胞受体(T cell receptor,TCR)基因重排的分子生物学检测、细胞标志物的免疫表型检测、以及细胞因子检测如IL-10的表达升高均可作为辅助诊断工具。目前PVRL的治疗主要包括局部放射及玻璃体腔内注射化疗药物(甲氨蝶呤和利妥昔单抗),根据眼外组织是否受累决定是否联合全身化疗。对伴随PCNSL的患者,在全身大剂量甲氨蝶呤联合利妥昔单抗治疗的基础上,考虑联合局部治疗、全脑放疗和/或自体干细胞移植。尽管PVRL对初始治疗反应良好,但因其复发率高,常出现CNS受累,使PVRL的生存期预后较差。因此建立一个包含眼科医师、眼科病理学家、神经肿瘤学家以及血液肿瘤学家在内的专业团队来优化患者的治疗方案显得尤为重要。

Application of magnetotactic bacteria as engineering microrobots:Higher delivery efficiency of antitumor medicine

For a significant duration,enhancing the efficacy of cancer therapy has remained a critical concern.Magnetotactic bacteria(MTB),often likened to micro-robots,hold substantial promise as a drug delivery system.MTB,classified as anaerobic,aquatic,and gram-negative microorganisms,exhibit remarkable motility and precise control over their internal biomineralization processes.This unique ability results in the formation of magnetic nanoparticles arranged along filamentous structures in a catenary fashion,enclosed within a membrane.These bacteria possess distinctive biochemical properties that facilitate their precise positioning within complex environments.By harnessing these biochemical attributes,MTB could potentially offer substantial advantages in the realm of cancer therapy.This article reviews the drug delivery capabilities of MTB in tumor treatment and explores various applications based on their inherent properties.The objective is to provide a comprehensive understanding of MTB-driven drug delivery and stimulate innovative insights in this field.

生物复杂环境下的核磁共振技术和应用:机遇与挑战并存

核磁共振(nuclear magnetic resonance, NMR)技术是研究生物大分子结构、动力学和相互作用最理想的工具之一.近年来,高场NMR波谱仪的使用和NMR实验方法的不断创新,在很大程度上提高了NMR技术检测的灵敏度和分辨率,使NMR技术得到快速发展和广泛应用.目前,生命科学与物质科学的交叉融合使生命科学研究从观察、描述性科学转向定量、可预测性科学,多种学科交叉渗透发展已成为科学研究领域十分普遍的现象.在这种趋势下,生物复杂环境下的磁共振谱学研究体系日趋成熟,本文重点回顾和讨论了多学科交叉研究趋势下NMR技术在生物复杂体系中的应用和发展,主要包括复杂膜环境下的膜蛋白研究、复杂细胞环境下的细胞内NMR(in-cell NMR)研究以及骨组织的固体NMR研究等.

Mosquito-Associated Viruses in China

Mosquitoes are classified into approximately 3500 species and further grouped into 41 genera.Epidemiologically,they are considered to be among the most important disease vectors in the world and they can harbor a wide variety of viruses.Several mosquito viruses are considered to be of significant medical importance and can cause serious public health issues throughout the world.Such viruses are Japanese encephalitis virus(JEV),dengue virus(DENV),chikungunya virus(CHIKV),and Zika virus(ZIKV).Others are the newly recognized mosquito viruses such as Banna virus(BAV)and Yunnan orbivirus(YNOV)with unclear medical significance.The remaining mosquito viruses are those that naturally infect mosquitoes but do not appear to infect humans or other vertebrates.With the continuous development and improvement of mosquito and mosquito-associated virus surveillance systems in China,many novel mosquito-associated viruses have been discovered in recent years.This review aims to systematically outline the history,characteristics,distribution,and/or current epidemic status of mosquito-associated viruses in China.

EBV-Induced Human CD8^＋ NKT Cells Synergise CD4^＋ NKT Cells Suppressing EBV-Associated Tumours upon Induction of Thl-Bias

CD8^＋ natural killer T （NKT） cells from EBV-associated tumour patients are quantitatively and functionally impaired. EBV-induced CD8^＋ NKT cells drive syngeneic T cells into a Thl-bias response to suppress EBV-associated malignancies. IL-4-biased CD4^＋ NKT cells do not affect either syngeneic T cell cytotoxicity or Th cytokine secretion. Circulating mDC1 cells from patients with EBV-associated malignancies impair the production of IFN-T by CD8^＋ NKT cells. In this study, we have established a human-thymus-SCID chimaera model to further investigate the underlying mechanism of EBV-induced CD8^＋ NKT cells in suppressing EBV-associated malignancies. In the human-thymus-SCID chimera, EBV-induced CD8^＋ NKT cells suppress EBV-associated malignancies in a manner dependent on the Thl-bias response and syngeneic CD3^＋ T cells. However, adoptive transfer with CD4^＋ NKT cells alone inhibits T cell immunity. Interestingly, CD4^＋ NKT cells themselves secrete high levels of IL-2, enhancing the persistence of adoptively transferred CD8^＋ NKT cells and T cells, thereby leading to a more pronounced T cell anti-tumour response in chimaeras co-transferred with CD4^＋ and CD8^＋ NKT cells. Thus, immune reconstitution with EBV-induced CD4^＋ and CD8^＋ NKT cells synergistically enhances T cell tumour immunity, providing a potential prophylactic and therapeutic treatment for EBV-associated malignancies.

新型生物标志物可溶性髓样细胞触发受体-1在重症肺炎早期诊断中的应用价值

目的探究血清可溶性髓样细胞触发受体-1(sTREM-1)在重症肺炎早期诊断中的应用价值。方法2021年6月到2021年12月于吉林大学第二医院就诊的60例肺炎患者纳入研究组,其中重症40例(重症肺炎组)和轻症20例(普通肺炎组)。以及同期门诊体检者15例纳入健康对照组。研究组患者均于入院24 h内使用肺炎严重程度指数(PSI)评分进行评估;分别采用电化学发光法、散射比浊法、酶联免疫吸附实验(ELISA)检测血清降钙素原(PCT)、超敏C-反应蛋白(hs-CRP)和sTREM-1水平。比较重症肺炎组、普通肺炎组及健康对照组研究对象入组24 h内血清sTREM-1水平,并比较重症肺炎组和普通肺炎组研究对象入组24 h内血清PCT、hs-CRP水平及PSI评分。采用Pearson相关性分析探讨血清sTREM-1和hs-CRP水平与PSI评分的相关性;采用Spearson相关性探讨血清PCT水平与PSI评分的相关性。绘制受试者工作特征曲线(ROC)及应用MedCalc软件比较曲线下面积(AUC)比较血清sTREM-1、PCT和hs-CRP对重症肺炎早期诊断的价值。结果重症肺炎组、普通肺炎组以及健康对照组血清sTREM-1表达水平(4864.81±1314.53 pg/ml、1144.58±571.01 pg/ml、509.11±43.70 pg/ml)差异有统计学意义(F=109.292、P<0.001),其中重症肺炎组较普通肺炎组和健康对照组显著升高(t=10.981、P<0.001,t=9.264、P<0.001)。重症肺炎组患者血清PCT、hs-CRP水平以及PSI评分均高于普通肺炎组,差异有统计学意义(Z=-3.360、P=0.001,t=2.047、P=0.048,t=4.878、P<0.001)。血清sTREM-1、PCT和hs-CRP诊断重症肺炎的AUC分别为1.00、0.86和0.68(95%CI:1.00~1.00、0.73~0.98、0.51~0.86);分别以2916.92 pg/ml、0.31 ng/ml和32.14 mg/L为截断值时约登指数最大,对应的敏感性分别为100%、85%和85%,特异性分别为100%、81%和50%。sTREM-1诊断重症肺炎的AUC与hs-CRP、PCT差异均有统计学意义(Z=3.463、P<0.001,Z=2.220、P=0.026);hs-CRP与PCT差异无统计学意义(Z=1.454、P=0.146)。PSI评分与血清sTREM-1(r=0.641、P<0.001)、PCT(r=0.540、P=0.001)呈正相关,与血清hs-CRP无相关性(r=0.269、P=0.124)。结论肺炎患者血清sTREM-1升高,以重症患者升高更为显著,且其与PSI评分呈正相关;检测血清sTREM-1水平有助于早期诊断重症肺炎,且其特异性及敏感性高,均优于PCT和hs-CRP,有望成为新的早期诊断重症肺炎的生物标志物。

肺表面活性蛋白-D在高原肺水肿发生发展中的表达及作用

目的探讨肺表面活性蛋白-D(SP-D)在高原肺水肿发生发展中的表达及作用。方法将64只Wistar雄性大鼠随机分为4组,正常对照组(16只,586 m室温饲养),低压低氧24 h、48 h及72 h组(各16只,于模拟海拔6000 m低压低氧舱内分别饲养24 h、48 h及72 h),取右侧肺组织行HE染色,观察肺组织损伤情况,收集左侧肺组织肺泡灌洗液,采用酶联免疫吸附法(ELISA)测定支气管肺泡灌洗液(BALF)中SP-D、白介素(IL)-1β、IL-6、C反应蛋白(CRP)及肿瘤坏死因子α(TNF-α)的含量。结果成功建造高原肺水肿动物模型;与正常对照组相比,低压低氧24、48、72 h组肺组织病理评分升高,差异有统计学意义(P<0.05);SP-D含量均有所下降,IL-1β、IL-6、CRP、TNF-α含量均上升,且各组间两两比较差异均有统计学意义(P<0.05);BALF中SP-D含量与肺组织病理评分呈负相关(r=-0.687,P<0.05),炎症因子IL-1β、IL-6、CRP及TNF-α与肺组织病理评分均呈正相关(r=0.705,P<0.05;r=0.728,P<0.05;r=0.733,P<0.05;r=0.737,P<0.05)。结论SP-D在高原肺水肿的发生发展中起着一定的作用,其可能是防治高原肺水肿的新靶点。

Kinetically accelerated and high-mass loaded lithium storage enabled by atomic iron embedded carbon nanofibers

Carbonaceous materials represent the dominant choice of materials for anodic lithium storage in many energy storage devices.Nevertheless,the nonpolar carbonaceous materials offer weak adsorption toward Li+that largely denies the high-rate Li+storage.Herein,the atomic Fe sites decorated carbon nanofibers(AICNFs)facilely produced by electrospinning are reported for kinetically accelerated Li+storage.Theoretical calculation reveals that the atomic Fe sites possess coordination unsaturated electronic configuration,enabling suitable bonding energy and facilitated diffusion path of Li+.As a result,the optimal structure displays a high capacitive contribution up to 95.9%at a scan rate of 2.0 mV·s^(−1).In addition,ultrahigh capacity retention of 97%is afforded after 5,000 cycles at a current density of 3 A·g^(−1).Moreover,the interlaced fiber structure enabled by electrospinning benefits structural stability and improved conductivity even at thick electrodes,thus allowing a high areal capacity of 1.76 mAh·cm−2 at a loading of 8 mg·cm−2.Because of these structure and performance merits,the lithium-ion capacitor containing the AICNF-based anode delivers a high energy density and large power density.

Comparative Metagenomic Profiling of Viromes Associated with Four Common Mosquito Species in China

Vast viruses are thought to be associated with mosquitoes.Anopheles sinensis,Armigeres subalbatus,Culex quinquefasciatus,and Culex tritaeniorhynchus are very common mosquito species in China,and whether the virome structure in each species is species-specific has not been evaluated.In this study,a total of 2222 mosquitoes were collected from the same geographic location,and RNAs were sequenced using the Illumina Miseq platform.After querying to the Refseq database,a total of 3,435,781,2,223,509,5,727,523,and 6,387,867 paired-end reads were classified under viral sequences from An.sinensis,Ar.subalbatus,Cx.quinquefasciatus,and Cx.tritaeniorhynchus,respectively,with the highest prevalence of virus-associated reads being observed in Cx.quinquefasciatus.The metagenomic comparison analysis showed that the virus-related reads were distributed across 26 virus families,together with an unclassified group of viruses.Anelloviridae,Circoviridae,Genomoviridae,Iridoviridae,Mesoniviridae,Microviridae,Myoviridae,Parvoviridae,Phenuiviridae,and Podoviridae were the top ten significantly different viral families among the four species.Further analysis reveals that the virome is species-specific in four mosquito samples,and several viral sequences which maybe belong to novel viruses are discovered for the first time in those mosquitoes.This investigation provides a basis for a comprehensive knowledge on the mosquito virome status in China.

EBV-induced human CD8^(+) NKT cells synergize CD4^(+) NKT cells suppressing EBV-associated tumors upon induction of Th1 bias

The authors inadvertently published histograms in the fourth panel to the right in both rows of Figure 4c that were actually the data of CD81 NKT cells from EBV-exposed CD8^(+)NKT cell-transferred,or EBV-exposed CD41 and CD81 NKT-trans-ferred hu-thym-SCID chimeras.The corrected figure included here contains the histograms that correctly represent the data of T cells from EBV-exposed CD41 and CD81 NKT-trans-ferred hu-thym-SCID chimeras.Since the fourth panels to the right in both rows of Figure 4c show the cellular proliferation using the CFSE labeling technique,the histogram substitutions do not alter the conclusions that were drawn from the original data.The authors would like to apologize for their mistake.