共查询到20条相似文献，搜索用时 421 毫秒
1.
《内蒙古科技与经济》2015,(8)
针对快走丝电火花线切割导电块磨损、夹丝问题展开讨论,提出智能导电系统,考虑了自动感应,智能更换,旋转功能,该智能导电块系统在很大程度上避免了导电块夹断电极丝,对提高加工效率,减少电极丝浪费,导电块的损耗有重要意义。 相似文献
2.
《科学中国人》2021,(4)
正一种自驱动、透明、柔性的人机交互轨迹追踪智能微系统电子科技大学电子学院张晓升教授课题组提出一种电极小型化策略,实现其高透光性和高电能输出的集成一体化,进而实现高灵敏透明轨迹追踪自驱动智能微系统。相关成果发表于Nanoenergy。纳米发电机(T E N G)已被证明是一种可靠的微纳能源,而且由于其自身具有"供电+功能"集成化的独特特性,可以作为自驱动传感器和自驱动执行器来构建智能人机交互微系统。研究显示,在缩小2/3电极面积的情况下,新型微纳能源采集器件的电学输出仍能保持高度稳定。这种电极小型化策略使器件具有更高的光透率和更低的信号干扰,使其在自驱动智能微系统领域,特别是在需要优异光学性能的领域显示出潜力。 相似文献
3.
《中国科技信息》2023,(4):7-10
<正>中山大学开发出用于健康监测的高性能多模态智能纺织品纺织材料已广泛应用在柔性传感器中,然而,能够区分多种刺激的多模态智能纺织传感器仍然存在挑战。近期,中山大学科研团队开发出能够同时实时测量温度和脉冲/触摸的多模态智能纺织品。研究成果发表在《Nano Energy》期刊,论文的标题为“Highperformance multimodal smart textile forartificialsensationandhealth monitoring”。该研究提出的多模态智能纺织品可以同时输出两个独立变量,作为摩擦电纳米发电机(triboelectric nanogenerator, TENG)检测脉冲/触摸,其核心热敏性微/纳米多孔纤维束(也是TENG的工作电极)检测温度。 相似文献
4.
5.
6.
7.
8.
生物电阻抗是生物组织一个重要的电参数,携带丰富的生理信息,对生物电阻抗的测量分析有着重大的实用价值。本装置采用一对激励电极和一对敏感电极组成四电极结构,用单片机控制DDS数字频率合成芯片结合低通滤波器产生50 kHz的正弦波,再经过恒流源,施加在与人体皮肤接触的激励电极上,通过测量敏感电极的电压,实现人体生物阻抗的检测。 相似文献
9.
为提高混合电势型NO_2传感器的气敏特性,在传感器敏感电极ZnFe_2O_4中加入一定量的钇稳定的氧化锆(YSZ)作为复合电极,研究了复合电极对NO_2的气敏特性。实验结果显示:复合电极对NO_2具有更优异的特性,提高了NO_2传感器的响应值和灵敏度。从传感器敏感机理分析,敏感电极中掺入YSZ使得三相反应界面增多是复合电极对NO_2具有优异特性的主要原因。 相似文献
10.
11.
农户认知视角下广东省农村土地流转意愿与流转行为研究 总被引：24，自引：1，他引：23
以广东省为例,基于446份农户调查数据,从农户自身特征、农户家庭特征、农户生活感知、农村社会保障认知、农地政策制度认知、农户金融服务认知6个方面探寻农地流转意愿主要的影响因素,分析其农地流转行为特征与原因,并剖析了流转意愿与流转行为的差异性及其原因.研究结果表明: ①农户的农村社会保障认知显著影响农户土地流转意愿,且和完善农村社保制度相比,稳定的非农就业机会和收入来源更能提高农户农地流转意愿;土地调整制度的相对稳定性并不能提高农户土地流转的意愿,而土地抛荒现象受惩罚可能性越大时,农户土地流转意愿越大;在当前农村信贷金融市场不健全的背景下,农户金融服务认知对农户土地流转意愿影响不显著;②家庭耕地面积越大、家庭年收入越高、收入来源以非农业为主及家庭参加农村社会养老保险等家庭特征能显著提高农户流转意愿,但农户个体特征及对生活的感知对其影响不显著;③样本农户中有土地流转意愿的农户达41.3%,农户土地流转率为33.2%.土地流转形式以出租为主,流转过程中有中介参与,村行政管理部门监督管理土地流转机制不够完善;④广东省农户土地流转的行为特征存在地区差异.与粤东、粤西和粤北相比,珠三角农户的土地流转行为更规范,流转对象更广泛,村行政管理部门监督管理土地流转机制更完善,土地流转行为更有法律意识;⑤农户土地流转参与意愿越强烈,流转行为越容易发生,但调查农户中仍有30%的农户有流转意愿却未发生流转行为,导致农户土地流转意愿与行为差异的主要原因是土地流转的外部环境. 相似文献
12.
J. J. Fleming S. Rajaratnam M. S. Seshadri A. S. Kanagasabapathy 《Indian journal of clinical biochemistry : IJCB》2001,16(1):95-100
An audit of 2509 patient specimens analyzed for both total thyroxine (TT4) and free thyroxine (FT4) by the ACS-180 automated
chemiluminescence immunoassay analyzer revealed that there were 219 discrepancies (8.7% of the total). A discrepancy was defined
as one analyte within its reference range and the other outside. The discrepant results were divided into 4 groups: group
A: normal TT4, but decreased FT4, 101 patients (4.0%); group B: increased TT4, normal FT4, 78 patients (3.1%); group C: decreased
TT4, normal FT4, 34 patients (1.4%); and group D: normal TT4, increased FT4, 6 patients (0.2%). TSH measurements were available,
by a 3rd generation chemiluminescent assay, in 142 of these patients, and were consistent with the FT4 result in 72 patients, with
TT4 in 61 cases and with neither in 9 patients. The clinical diagnosis was investigated in a subgroup of 43 endocrine patients.
Thirteen of the 20 endocrine patients in group A were diagnosed as hypothyroid, with a measured serum TSH, in 11 of them,
of median 14.6, range 1.2 to 46.2 μlU/ml. Eleven of the 19 endocrine patients in group B were on thyroid replacement, with
a measured serum TSH, in 7 of them of <0.01 μlU/ml. The audit of current laboratory practice led to a suggestion to replace
the current thyroid function screening strategy of measuring both TT4 and FT4 by the combination of FT4 and TSH. The reasons
for the discrepancies and the alternative strategies for screening of thyroid function are discussed. 相似文献
13.
P. V. L. N. Srinivasa Rao K. V. Dakshinamurty K. S. S. Saibaba P. V. L. N. Murty G. Venkataramana V. Sreekrishna 《Indian journal of clinical biochemistry : IJCB》1999,14(2):184-188
Chronic renal failure, characterised by two factors acting in opposite directions with respect to the serum thyroid homone
levels was chosen for the study. Healthy controls, donors undergoing nephrectomy and renal transplant recipients were studied.
In transplant recipients, presurgical levels of total thyroxine(TT4), free triiodothyronine(FT3) and free thyroxine(FT4) were
lower than controls, and immediately after the release of arterial clamps, there was an upsurge of total triiodothyronine
(TT3), TT4, FT3 and FT4 due to administered and/or endogeneously secreted catecholamines. The levels of the 7th day were comparable
to the presurgical levels. The changes observed in donors and recipients were similar indicating that the hormonal changes
observed are mostly due to surgical stress. Recovery in the hormonal status did not start in the first week of posttransplant
period. 相似文献
14.
Chang Liu Yuru Guo Hongxia Rao Ming Lin Yong Xu 《Journal of The Franklin Institute》2021,358(4):2367-2381
Finite-time (FT) synchronization for periodic T–S fuzzy master-slave neural networks (NNs) with distributed delays is addressed in this work. A fuzzy controller is designed for the salve NNs to synchronize the master NNs in FT and a synchronization error system (SES) is derived. Sufficient conditions are established to guarantee that the SES is FT bounded by using the mode and fuzzy basis dependent Lyapunov function. A new algorithm is proposed to obtain the suboptimal boundary of the SES to analyze how the periodic characteristics affect the system boundary. Finally, a numerical example is provided to demonstrate the validity of the fuzzy controller and the iterative algorithm for the boundary. 相似文献
15.
Puja kumari Jha Nirupama Sharma Juhee Chandra Rachna Agarwal 《Indian journal of clinical biochemistry : IJCB》2021,36(3):337
Variability in analytical performance of some analyte indicated the need of evaluation of quality plan of our laboratory. We tried to put the same degree of effort into our quality metrics as we put into the laboratory processes themselves. Application of six sigma methodologies improve the quality by focusing on the root causes of the problems in performance and analyzing by flowcharts, fishbone diagrams and other quality tools. Sigma metric was calculated for laboratory parameters for a period of 8 months during 2018–19. The analytes with poor sigma metric were free Thyroxine (FT3, FT4), Sodium, Calcium and Magnesium. Sigma metric of free Thyroxine (FT3, FT4), Sodium, Calcium and Magnesium were below 3. A road map for process improvement was designed with DMAIC (Define-Measure-Analyze-Improve-Control) model to solve the issue. Possible causes for low analytical performance of the particular analytes were depicted in Fishbone diagram. The Fishbone analysis identified the water quality issues with electrolyte analysis while high ambient temperature was culprit for poor assay performance of free Thyroxine. Sigma metric of the analytical performance was assessed once again after root cause analysis. Sigmametric showed marked improvement in control phase. Identification of problems led to reduction in non value added work leading to adequate resource utilization by addressing the priority issue. Therefore, DMAIC tool with Fish bone model analysis can be recommended as a well suited method for troubleshooting in poor performance of laboratory parameter. 相似文献
16.
Adriana Bokuli&#x; Ivana Zec Domagoj Marijan
evi&#x; Sanja Goreta Marija Pogaj &#x;epec Lavinia La Grasta Saboli&#x; 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2021,31(3)
IntroductionEvaluation of thyroid function is often requested and therefore defining paediatric reference intervals (RIs) is of vital importance. Currently, there is a distinct lack of paediatric RIs for thyroid function tests in Croatia. Thus, we established RIs for thyroid stimulating hormone (TSH), total triiodothyronine (TT3), total thyroxine (TT4), free triiodothyronine (FT3) and free thyroxine (FT4) in the Croatian paediatric population.Materials and methodsReference intervals were calculated from 397 apparently healthy children, aged from 2 days to < 19 years. Serum samples were analysed for thyroid function tests on the Abbott Architect i2000. Age- and sex-specific 95% RIs with 90% confidence intervals were established according to Clinical and Laboratory Standards Institute guidelines. To express the magnitude of sex and age variation, standard deviation ratio (SDR) was calculated using two-level nested ANOVA. The criterion for considering partitioning reference values was set to SDR > 0.3.ResultsAll thyroid function tests required age partitioning, confirmed by SDR above 0.3. There was no need for sex partitioning, confirmed by SDR below 0.3. Still, FT3 was partitioned due to visually noticeable sex related difference for the oldest group (12 years to < 19 years).ConclusionThis is the first study to establish RIs for thyroid function tests in the Croatian paediatric population. We propose RIs for widely used Abbott platform, thus giving laboratories method- and population-specific paediatric RIs for thyroid function tests that should improve clinical test interpretation. 相似文献
17.
目的对比研究高碘地区和非高碘地区育龄妇女的甲状腺功能和血液抗氧化能力。方法测定高碘地区和非高碘地区育龄妇女甲状腺功能指标和血液抗氧化酶活性。结果高碘地区育龄妇女血中总甲状腺素(TT3)明显高于非高碘地区,而游离三碘甲腺原氨酸(FT3)明显低于非高碘地区。高碘地区育龄妇女血中TT3和FT3的异常率高于非高碘地区;高碘地区育龄妇女血中谷胱甘肽过氧化物酶(GSH-Px)和超氧化物酶(SOD)的活性低于非高碘地区。结论高碘地区育龄妇女甲状腺激素水平异常的比率高于非高碘地区,从而有可能增加甲状腺疾病发生的风险;高碘地区育龄妇女血中GSH-Px和SOD的活性均低于非高碘地区,长期摄入高碘有可能使当地育龄妇女抗氧化损伤的能力降低,导致机体的氧化损伤。 相似文献
18.
《Information processing & management》2023,60(4):103351
Existing 2D image-based 3D model retrieval (IBMR) methods usually use the pseudo labels as semantic guidance to reduce the domain-wise and class-wise feature distribution difference across annotated 2D images and unlabeled 3D models. However, they cannot entirely guarantee the quality of pseudo labels, which will decrease prediction discriminability and diversity to affect feature distribution alignment. Therefore, we propose a novel unsupervised self-training correction learning (USTCL) network for the IBMR task. Specifically, we first utilize a CNN to encode 2D images and 3D models (described as multi-view images). Then, we design a noise-corrected self-training learning module (NCST) to denoise pseudo labels in an adversarial manner to make the predicted categories more easily discriminated to improve prediction discriminability. Besides, we employ a target-guided pseudo label refining strategy (TPLR) to progressively refine generated pseudo labels to prevent minority categories from being pushed into majority categories, thereby enhancing prediction diversity. Comprehensive experiments on popular IBMR benchmarks validate the effectiveness and robustness of USTCL, e.g., it can achieve the average gains of 54.20%/22.30%, 62.17%/43.21%, 54.21%/31.18%, 63.48%/43.28%, 59.87%/44.49% in terms of NN, FT, ST, F-measure, DCG and the decrease of 29.50%/35.15% corresponding to ANMRR on MI3DOR (21,000 2D images and 7,690 3D models) and MI3DOR-2 (19,694 2D images and 3,982 3D models), respectively. 相似文献
19.
我国以煤为主的能源结构在未来相当长的时期内不会改变,探明煤炭储量中一半以上为低阶煤,但目前其利用方式(直接燃烧或气化)效率低、污染物和碳排放量大。为此,中科院依据低阶煤的组成与结构特征,提出了低阶煤清洁高效梯级利用的解决方案,即以高效热解为先导,提取煤中业已存在的油气资源,剩余半焦燃烧发电、或经气化定向转化为液体燃料和化学品。形成了"热解-油气提质-半焦燃烧-发电"、"热解-气化-合成"和"热解-气化-费托合成-油品共处理"三条技术路线。计划经过5—10年的努力,突破10项以上关键示范技术,形成适合我国资源特征的高能效、低污染、低排放和高值化的低阶煤综合利用技术体系,使系统能效提高5—8个百分点,硫、硝和重金属等污染物排放显著降低,CO2捕获成本降低30%—40%,以推动我国煤电和煤化工行业的技术进步。 相似文献
20.
大数据、人工智能、社交媒体等数字技术正在不断渗透和改变着创业行为和结果,但数字技术对创业活动的影响研究现在还处于探索阶段,缺乏一个系统的研究框架。基于此,本文在FT50和UTD24共52个期刊中,选取1998年至2018年近21年有关数字技术与创业活动关系的研究进行梳理,旨在揭示数字技术的内涵和属性及其对创业活动的影响。研究发现数字技术对创业活动有正面和负面影响并且挑战了现有的创业理论,包括资源基础观、动态能力、制度理论、网络理论、机会发现观和机会创造观。最后基于研究局限性及现实需求,并运用过程理论的思想构建未来的研究框架,提出未来需要重点研究的问题。 相似文献