检索结果-南通市图书馆

An approach to net-centric control automation of technological processes within industrial IoT systems

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Advances in Manufacturing 2017年第4期5卷 388-393页

作者： nikita Voinov Igor Chernorutsky Pavel Drobintsev Vsevolod Kotlyarov Institute of Computer Science and Technology Peter the Great St. Petersburg Polytechnic UniversityPolytechnicheskaya 29 Saint Petersburg Russia 195251

The use of industrial internet networks with net- centric control is the driving trend behind the future material manufacturing of goods and services. The promising future of this approach is provided by these complex net-centric systems functioning with high relia- bility. The problem of intelligent net-centric control and reliable network functioning is fundamental, with the additional requirement that the system should preserve stakeholder security and privacy according to policies. The issue is that such systems are characterized by complex multi-parameter operability modes controlled by various criteria. This study considers an approach to providing reliable management of complicated Internet of things （IoT） systems. This is achieved by solving multi-criteria tasks over many processes of various physical natures. Corresponding methods of hierarchical decomposition of multi-criteria tasks, process levels of multi-criteria opti- mization, specifics of aggregation levels, and the master equation of the optimization process are described.

关键词： Net-centric control Technological process Internet of things (IoT) Reliability Multi-criteria optimization

Magnetic field hyperactivity during the early Neoproterozoic: A paleomagnetic and cyclostratigraphic study of the Katav Formation, southern Urals, Russia

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2023年第4期14卷 42-56页

作者： Inessa V.Golovanova Konstantin N.Danukalov Raushaniia Yu.Salmanova Natalia M.Levashova nikita P.Parfiriev Nina D.Sergeeva Joseph G.Meert Institute of Geology-Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences(IG UFRC RAS) Russia Geological Institute Russian Academy of SciencesMoscowRussia Department of Earth and Planetary Sciences Neil Opdyke Paleomagnetic LaboratoryUniversity of FloridaGainesvilleFL 32611United States

We present a detailed magnetostratigraphic and cyclostratigraphic profile through the Riphean(Tonian)Katav Formation in the southern *** study confirms the primary nature of the magnetization in these *** cyclostratigraphic study identified several orbital periods including the 405 ka long *** allows us to quantify the reversal frequency in the Katav and our estimates range of 7–12 reversals per million *** on our study,we identify an interval of magnetic field reversal hyperactivity in the Neoproterozoic *** estimates for the Katav are contentious and range somewhere between 800 Ma and 900 Ma based on carbonate Pb-Pb ages and stable isotope *** paleomagnetic poles obtained in this study of the Katav(and overlying Inzer)Formation do not fit anywhere on the Baltica apparent polar wander path between 1100 Ma and 900 ***,they lie 90away from the 900 Ma segment of the *** tentatively estimate their age to be closer to 800 Ma and perhaps confirm a previously hypothesized pulse of rapid true polar wander between 825 Ma and 790 Ma.

关键词： Magnetostratigraphy Cyclostratigraphy Hyperactive reversal True polar wander Tonian

Basal cisternostomy for traumatic brain injury: A case report of unexpected good recovery

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Traumatology 2022年第5期25卷 302-305页

作者： Manuel De Jesus Encarnacion Ramirez Rossi Evelyn Barrientos Castilo Anton Vorobiev nikita Kiselev Amaya Alvarez Aquino Ibrahim E.Efe Department of Neurosurgery Russian People's Friendship University MoscowRussia Department of Neurosurgery Municipal HospitalPodolskRusia Department of Neurosurgery International Center for Neurological Restoration HavanaCuba Charite-Universitatsmedizin Berlin Corporate Member of Freie Universitat BerlinHumbold-Universitat zu BerlinAnd Berlin Institute of HealthBerlinGermany

In subarachnoid hemorrhage following traumatic brain injury (TBI), the high intracisternal pressure drives the cerebrospinal fluid into the brain parenchyma, causing cerebral edema. Basal cisternostomy involves opening the basal cisterns to atmospheric pressure and draining cerebrospinal fluid in an attempt to reverse the edema. We describe a case of basal cisternostomy combined with decompressive craniectomy. A 35-year-old man with severe TBI following a road vehicle accident presented with acute subdural hematoma, Glasgow coma scale score of 6, fixed pupils and no corneal response. Opening of the basal cisterns and placement of a temporary cisternal drain led to immediate relaxation of the brain. The patient had a Glasgow coma scale score of 15 on postoperative day 6 and was discharged on day 10. We think basal cisternostomy is a feasible and effective procedure that should be considered in the management of TBI.

关键词： Basal cisternostomy Cerebral edema Decompressive craniectomy Neurotrauma Traumatic brain injury

计及电动汽车接入的区域综合能源系统双层日前协调优化调度

在线全文

学校读者我要写书评

暂无评论

电力建设 2023年第5期44卷 23-33页

作者：李玲曹锦业 nikita Tomin 杨德昌郑颖颖中国农业大学信息与电气工程学院北京市100083 俄罗斯科学院西伯利亚分院能源研究所新西伯利亚630090

规模化电动汽车(electric vehicles,EV)的接入对区域综合能源系统(regional integrated energy system,RIES)优化调度提出了新的挑战,文章提出了计及分布式电源和电动汽车源荷双向互动的RIES双层日前优化调度策略。首先,采用蒙特卡洛法... 详细信息

规模化电动汽车(electric vehicles,EV)的接入对区域综合能源系统(regional integrated energy system,RIES)优化调度提出了新的挑战,文章提出了计及分布式电源和电动汽车源荷双向互动的RIES双层日前优化调度策略。首先,采用蒙特卡洛法模拟电动汽车无序充电,在此基础上利用分时电价引导负荷侧的电动汽车有序充电;然后,基于电力市场和碳交易市场,充分考虑源侧风光出力和负荷侧价格型需求响应等过程中的不确定性因素,以日系统经济成本和碳交易成本最低为目标进行系统优化调度,并采用改进粒子群算法进行求解;最后,通过仿真算例分析可得,文章提出的双层优化调度策略能够有效降低系统的负荷峰谷差,在实现电动汽车有序充电的同时,能够有效提升用户用电满意度、降低碳排放量以及增加系统经济效益。

关键词：电动汽车有序充电分时电价需求响应双层日前调度策略

Experimental Simulation of Red Sprites in a Laboratory

在线全文

学校读者我要写书评

暂无评论

Journal of Atmospheric Science Research 2022年第3期5卷 26-36页

作者： Victor Tarasenko nikita Vinogradov Evgenii Baksht Dmitry Sorokin Laboratory of Optical Radiations Institute of High Current Electronics SB RASTomsk634055Russia

Over the past three decades,research of high-altitude atmospheric discharges has received a lot of *** paper presents the results of experimental modeling of red sprites during a discharge in low-pressure *** initiate ionization waves in a quartz tube,an electrodeless pulse-periodic discharge fed by microsecond voltage pulses with an amplitude of a few kilovolts and a repetition rate of tens of kHz were *** this case ionization waves(streamers)have a length of tens of *** main plasma parameters were measured at various distances along the *** measurements confirm the fact that ionization waves propagate in opposite directions from the zone of the main electrodeless discharge,just as it happens during the formation of red sprites.

关键词： Red sprites Experimental modeling Streamer discharge in air Low pressures

A Comparison of SWAT Model Calibration Techniques for Hydrological Modeling in the Ganga River Watershed

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering 2018年第5期4卷 643-652页

作者： nikita Shivhare Prabhat Kumar Singh Dikshir Shyam Bihari Dwivedi Indian Institute of Technology Banaras Hindu University Varanasi 221005 India

恒河是印度最长的河流,目前正遭受人类活动和气候变化的影响,其中瓦拉纳西区域所受的影响尤为严重。预计气候变化和不断扩张的人口会进一步影响水资源的有效利用。本研究利用水土评价工具(soil and water assessment tool,SWAT)模型进... 详细信息

恒河是印度最长的河流,目前正遭受人类活动和气候变化的影响,其中瓦拉纳西区域所受的影响尤为严重。预计气候变化和不断扩张的人口会进一步影响水资源的有效利用。本研究利用水土评价工具(soil and water assessment tool,SWAT)模型进行水文模拟,研究区选择恒河流经的印度北方邦南部地区,覆盖面积达15 621.612 km^2。本研究主要目标如下:(1)检验SWAT模型在径流和产沙量预测方面的可行性和适用性,(2)对序贯不确定性分析(SUFI-2)、普适似然不确定性估计(GLUE)和并行求解(ParaSol)这3种常规校准算法进行对比分析,并确定出最佳校准算法。SWAT模型中输入数据的来源为航天飞机雷达地形测绘任务(SRTM)获取的数字高程模型(DEM)、Landsat-8卫星图像、土壤数据和逐日气象数据。首先,本研究将研究流域划分为46个子流域,使用土地利用/土地覆被(LULC)图和土壤图创建了水文响应单元(HRU)。然后,构建了基于SUFI-2、GLUE和ParaSol算法的模型,并基于5类标准对这些校准算法进行了比较,标准包括目标函数、使用概念、性能、P因子和R因子值。研究结果表明:(1) SUFI-2算法需要的运行时间较少,同时校准结果最好,ParaSol算法最差;(2)使用SUFI-2算法对模型进行校准后,获得对模拟结果影响最显著的5个敏感参数——主河道水力传导率(CH_K2)、USLE方程水土保持因子(USLE_P)、主河道曼宁系数值(CH_N2)、地表径流滞后时间(SURLAG)以及土壤有效含水量(SOL_AWC);(3) 40号子流域(SW#40)产生的径流量最大,土地利用类型为荒地的36号子流域(SW#36)的产沙量最大,达到50 t·a^(–1)。研究区的平均蒸散量为411.55 mm·a^(–1)。校准后的模型可以用于探究未来LULC的变化、气候变化和土壤侵蚀的影响。

关键词：甘加河印度河流水资源

Preparation of stable colloidal suspensions of superdisintegrants via wet stirred media milling

在线全文

学校读者我要写书评

暂无评论

Particuology 2014年第3期12卷 76-82页

作者： Mohammad A.Azad Afolawemi Afolabi nikita Patel Rajesh Davé Ecevit Bilgili Otto H.York Department of Chemical Biologicaland Pharmaceutical EngineeringNew Jersey Institute of TechnologyNewarkNJUSA

Superdisintegrants are cross-linked polymers that can be used as dispersants for fast release of drug nanoparticles from nanocomposite microparticles during in vitro and in vivo dissolution. Currently avail- able superdisintegrant particles have average sizes of approximately 5-130 μm, which are too big for drug nanocomposite applications. Hence, production of stable superdisintegrant suspensions with less than 5 μm particles is desirable. Here, we explore the preparation of colloidal suspensions of anionic and nonionic superdisintegrants using a wet stirred media mill and assess their physical stability. Sodium starch glycolate （SSG） and crospovidone （CP） were selected as representative anionic and nonionic superdisintegrants, and hydroxypropyl cellulose （HPC） and sodium dodecyl sulfate （SDS） were used as a steric stabilizer and a wetting agent/stabilizer, respectively. Particle sizing, scanning electron microscopy, and zeta potential measurements were used to characterize the suspensions. Colloidal superdisintegrant suspensions were prepared reproducibly. The extensive particle breakage was attributed to the swelling-induced softening in water. SSG suspensions were stable even in the absence of stabilizers, whereas CP suspensions required HPC-SDS for minimizing particle aggregation. These findings were explained by the higher absolute （negative） zeta potential of the suspensions of the anionic superdisintegrant （SSG） as compared with those of the nonionic superdisintegrant （CP）.

关键词： Colloidal suspensions Dispersants Physical stability Superdisintegrants Swelling Wet stirred media milling

Experimental repetitive mild traumatic brain injury induces deficits in trabecular bone microarchitecture and strength in mice

在线全文

学校读者我要写书评

暂无评论

Bone Research 2017年第4期5卷 357-366页

作者： Chandrasekhar Kesavan nikita M Bajwa Heather Watt Subburaman Mohan Musculoskeletal Disease Center VA Loma Linda Healthcare SystemLama LindaCAUSA Department of Medicine Loma DndaCAUSA Department of Orthopedic Surgery Loma Linda UniversityLoma LindaCAUSA

To evaluate the long-term consequence of repetitive mild traumatic brain injury （mTBI） on bone, mTBI was induced in 10-week-old female C57BL/6J mice using a weight drop model, once per day for 4 consecutive days at different drop heights （0.5, 1 and 1.5 m） and the skeletal phenotype was evaluated at different time points after the impact. In vivo micro-CT （μ-CT） analysis of the tibial metaphysis at 2, 8 and 12 weeks after the impact revealed a 5%-32% reduction in trabecular bone mass. Histomorphometric analyses showed a reduced bone formation rate in the secondary spongiosa ofl.5 m impacted mice at 12 weeks post impact. Apparent modulus （bone strength）, was reduced by 30% （P 〈 0.05） at the proximal tibial metaphysis in the 1.5 m drop height group at 2 and 8 weeks post impact. Ex vivo μ-CT analysis of the fifth lumbar vertebra revealed a significant reduction in trabecular bone mass at 12 weeks of age in all three drop height groups. Serum levels of osteocalcin were decreased by 22%, 15%, and 19% in the 0.5, 1.0 and 1.5 m drop height groups, respectively, at 2 weeks post impact. Serum IGF-I levels were reduced by 18%-32% in mTBI mice compared to control mice at 2 weeks post impact. Serum osteocalcin and IGF-I levels correlated with trabecular BV/TV （r2 = 0.14 and 0.16, P 〈 0.05）. In conclusion, repetitive mTBI exerts significant negative effects on the trabecular bone microarchitecture and bone mechanical properties by influencing osteoblast function via reduced endocrine IGF-I actions.

关键词： IGF TBI Experimental repetitive mild traumatic brain injury induces deficits in trabecular bone microarchitecture and strength in mice

血液透析患者血清成纤维细胞生长因子21与肌少症的关系及相关机制

在线全文

学校读者我要写书评

暂无评论

中华肾脏病杂志 2023年第3期39卷 188-199页

作者：李旻张培王彬张梦雨刘舒苏 CROMWELL nikita 杨敏苏州大学附属第三医院肾内科常州213003 东南大学附属中大医院肾内科南京210009 Department of Nephrology Georgetown Public Hospital CorporationGeorgetownGuyana

目的探讨血液透析(hemodialysis, HD)患者血清成纤维细胞生长因子21(fibroblast growth factor 21, FGF21)与肌少症的关系, 并在细胞水平初步探索尿毒症状态下FGF21与骨骼肌代谢相关信号通路的关系。方法该前瞻性观察性研究搜集2018—2... 详细信息

目的探讨血液透析(hemodialysis, HD)患者血清成纤维细胞生长因子21(fibroblast growth factor 21, FGF21)与肌少症的关系, 并在细胞水平初步探索尿毒症状态下FGF21与骨骼肌代谢相关信号通路的关系。方法该前瞻性观察性研究搜集2018—2019年苏州大学附属第三医院血液净化中心接受HD的患者资料。以ELISA法检测HD患者血清FGF21浓度, 同时根据第四胸椎(the fourth thoracic vertebra, T4)及第一腰椎(the first lumbar vertebra, L1)计算机断层扫描(computed tomography, CT)平面骨骼肌指数(skeletal muscle index, SMI)将患者分为肌少症组及非肌少症组, 分析FGF21与肌少症的关系。体外培养小鼠C2C12成肌细胞, 分别给予健康人血清、健康人血清+不同浓度FGF21、尿毒症血清、尿毒症血清+不同浓度FGF21干预细胞, 并采用Western印迹法检测各组肌肉环指蛋白-1(muscle ring finger protein-1, MURF1)、肌肉萎缩相关的F-box蛋白(muscle atrophy F-box, MAFbx/Atrogin-1)、成肌分化因子(myogenic differentiation, MyoD)、肌细胞生成素(myogenin, MyoG)的表达。结果共有118例HD患者被纳入此项研究, 其中男性64例(54.2%), 女性54例(45.8%), 年龄为(52.64±15.29)岁。118例HD患者有CT T4图像, 根据T4 SMI性别特异性最低四分位数(P25)为截点值分组(男性 < 59.92 cm^(2)/m^(2), 女性 < 46.75 cm^(2)/m^(2)), 肌少症组29例, 非肌少症组89例, 肌少症患者比例高达24.58%。82例患者有L1横断面图像, 根据L1 SMI性别特异性最低四分位数(P25)为截点值分组(男性 < 29.02 cm^(2)/m^(2), 女性 < 24.50 cm^(2)/m^(2)), 肌少症组20例, 非肌少症组62例, 肌少症患者比例高达24.39%。根据T4 SMI分组结果显示, 肌少症组患者血清FGF21水平高于非肌少症组, 但两组间差异无统计学意义[448.52(183.96, 1 684.08)ng/L比273.65(152.83, 535.54)ng/L, Z=-1.741, P=0.082]。根据L1 SMI分组结果显示, 肌少症组患者血清FGF21水平显著高于非肌少症组[460.95(188.91, 1 276.38)ng/L比239.10(133.25, 466.36)ng/L, Z=-2.170, P=0.030]。分别根据T4 SMI及L1 SMI进行分组, 二元Logistic回归分析结果均显示FGF21升高是HD患者发生肌少症的独立影响因素(根据T4 SMI分组:OR=4.085, 95%CI 1.778~9.388, P=0.001;根据L1 SMI分组:OR=7.327, 95%CI 1.841~29.160, P=0.005)。在T4和L1平面, FGF21预测HD患者发生肌少症的受试者工作特征曲线下面积分别为0.636(95%CI 0.494~0.779, P=0.036)和0.684(95%CI 0.535~0.833, P=0.018)。细胞实验结果显示, 在尿毒症血清中给予外源性FGF21干预后, 肌管细胞MURF1、Atrogin-1表达升高, 而MyoD、MyoG表达显著降低(均P < 0.05)。结论 HD患者血清FGF21升高与肌少症风险增加相关。FGF21在尿毒症状态下可能通过调节泛素蛋白酶体系统的表达, 减少骨骼肌细胞蛋白的合成及分化, 导致肌肉萎缩的发生。

关键词：肾透析成纤维细胞生长因子肌减少症尿毒症肌骨骼泛素蛋白酶体系统