检索结果-南通市图书馆

Journal of Integrative Agriculture 2022年第12期21卷 3600-3610页

作者： christian Adler PHARES Selorm AKABA Department of Soil Science School of AgricultureUniversity of Cape CoastGhana Department of Agriculture Economics and Extension School of AgricultureUniversity of Cape CoastGhana

Most agricultural soils in sub-Saharan Africa are degraded,compromising the grain yield of rice and farmers return on investment.A 3-year field study was undertaken to explore the effect of the application of compost or inorganic NPK fertilizer applied alone or in combination with biochar on soil quality,grain yield of rice and net *** five treatments were laid out using a randomized complete block design with four *** treatments were applied to supply approximately 75 kg N ha–*** best fertilizer input was compost+biochar which resulted in the greatest improvement in soil physico-chemical properties by reducing bulk density and increasing porosity and moisture retention,organic matter content,percent nitrogen,available phosphorus and cation exchange *** from treatment with inorganic fertilizer alone,treated soils showed a decrease in *** and fungal counts and basal respiration decreased in soils in the following order:compost+biochar>compost only>inorganic NPK fertilizer+biochar>inorganic NPK fertilizer>*** increase in pooled grain yield and net income in response to treatment followed the order:compost+biochar>NPK+biochar>NPK>compost>*** findings suggest that the use of compost or NPK alone might improve soil quality and increase grain yield and net income,but it is greatly recommended to co-apply these fertilisers with biochar.

关键词： biochar compost inorganic NPK fertilizer biochar-enriched compost biochar-enriched NPK fertilizer soil quality net income rice yield

Bistability theorem in a cancer model

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2018年第1期11卷 61-98页

作者： Jens christian Larsen Vanlcse Alle 50 2. mr. tv2720 VanlCse Copenhagen Denmark

In this paper, I continue the study of the mathematical models presented in [J. C. Larsen, Models of cancer growth, J. Appl. Math. Comput. 53（1-2）（2015） 613-645] and [J. C. Larsen, The bistability theorem in a model of metastatic cancer, to appear in Appl. Math.]. I shall prove the bistability theorem for the ODE model from [Larsen, 2015]. It is a mass action kinetic system in the variables C cancer, GF growth factor and GI growth inhibitor. This theorem says that for some values of the parameters, there exist two positive singular points c＊＋ = （C＊＋, GF＊., GI＊＋）, c＊2- = （C＊-, GF＊, GI＊-） of the vector field. Here C＊- 〈 C＊＋ and e. is stable and c＊＋ is unstable, see Sec. 2. There is also a discrete model in [Larsen, 2015], it is a linear map （T） on three-dimensional Euclidean vector space with variables （C, GF, GI）, where these variables have the same meaning as in the ODE model above. In [Larsen, 2015], I showed that one can sometimes find attine vector fields on three-dimensional Euclidean vector space whose time one map is T. I shall also show this in the present paper in a more general setting than in [Larsen, 2015]. This enables me to find an expression for the rate of change of cancer growth on the coordinate hyperplane C = 0 in Euclidean vector space. I also present an ODE model of cancer metastasis with variables C, CM, CF,GI, where C is primary cancer and CM is metastatic cancer and GF, GI are growth factors and growth inhibitors, respectively.

关键词： Immunology cancer chemotherapy immune therapy discrete dynamicalsystem Gompertz function.

Cystine oligomers successfully attached to peptide cysteine- rich fibrils

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

Frontiers of Chemical Science and Engineering 2016年第1期10卷 99-102页

作者： christian Bortolini Mingdong Dong Interdisciplinary Nanoscience Center (iNANO) Aarhus University Aarhus C 8000 Denmark

Amyloid peptides are renowned to be related to neurodegenerative diseases, however, a fruitful avenue is to employ them as high-performance nanomaterials. These materials benefit from the intrinsic outstanding mechanical robustness of the amyloid backbone made of r-strands. In this work, we exploited amyloid-like fibrils as functional material to attach pristine L-cysteine aggregates （cystine oligomers） and gold nanoparticles, without the need of templating compounds. This work will open new avenues on functional materials design and their realisation.

关键词： cysteine peptide fibrils gold nanoparticles amyloids oligomers nanomaterials

Vulnerability and Resilience Research:A Critical Perspective

在线全文

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2014年第1期5卷 86-87页

作者： Hannes Taubenbock christian Geiв German Remote Sensing Data Center German Aerospace CenterOberpfaffenhofen82234 WesslingGermany

‘‘Vulnerability’’and‘‘resilience’’are terms of such broad conceptual meaning as to be almost useless for careful scientific communication,except as rhetorical indicators of areas of greatest *** is a reflection of the complexity of their meaning,an uncoordinated search among different fields for a common understanding,and maybe the difficulty of systematizing these complicated issues among the various involved parties.

关键词： Resilience difficulty coordinated

Increasing the operating area of shunt active filters by advanced nonlinear control

在线全文

学校读者我要写书评

暂无评论

Control Theory and Technology 2015年第2期13卷 115-140页

作者： Andrea TILLI christian CONFICONI Center of Complex Automated Systems (CASY) at Department of Electrical Electronic and Information Engineering (DEI)University of Bologna

This work is aimed to rigorously manage voltage saturation and maximum current constraints in Shunt Active Filters. In this respect, assuming 'unconstrained' control algorithms have already been defined to achieve standard objectives for such devices(i.e. current tracking for harmonic compensation and DC-bus voltage boundness), a plug-in unit, oriented to extend the system operating region and at the same time preserving good performance under large transients and overload conditions, is *** solution allows to improve availability, robustness and composability of Shunt Active Filters, which are expected to be key features in present and next generation complex and possibly 'smart' power grids. The proposed unit is composed by two ***, a suitable anti-windup strategy is defined in order to deal with control input saturation. Its main purpose is to preserve the original 'unconstrained error dynamics', in face of input saturation, while guaranteeing low computational burden and reduced performance impairment(the latter goal, in harmonic compensation context, leads to rather non-standard problem formulation).To this aim, the anti-windup acts on the current references through a suitably-designed additional dynamics. Then, in order to cope with current limitations, an additional strategy has been designed; again the current references is suitably shaped to comply with the features and bounds of the system, augmented with the above-mentioned anti-windup solution. The proposed scheme can be simply joined to any kind of unconstrained controller adopted to steer Shunt Active Filters. In this work, an Internal-Model-based current controller is adopted as a benchmark case. The proposed approach is validate through extensive simulation tests.

关键词： Shunt active filters power quality anti-windup units control of constrained systems

Collagen for brain repair:therapeutic perspectives

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2018年第4期13卷 595-598页

作者： Buket Ucar christian Humpel Laboratory of Psychiatry and Experimental Alzheimer's Research Medical University of Innsbruck

Biomaterials have increasingly become a focus of research on neuroprotection and ***,in terms of brain repair,presents many advantages such as being remarkably biocompatible,biodegradable,versatile and *** can be used to form injectable scaffolds and micro/nano spheres in order to：（i） locally release therapeutic factors with the aim of protecting degenerating neurons in neurodegenerative conditions such as Alzheimer＇s or Parkinson＇s diseases,（ii） encapsulate stem cells for safe delivery,（iii） encapsulate genetically modified cells to provide a long term source of trophic factors,（iv） fill in the voids from injury to serve as a structural support and provide a permissive microenvironment to promote axonal *** mini-review summarizes different applications of collagen biomaterial for central nervous system protection and repair,as well as the future ***,collagen is a promising natural biomaterial with various applications which has the potential to progress the development of therapeutic strategies in central nervous system injuries and degeneration.

关键词： biomaterial collagen scaffold microspheres neuroprotection neuroregeneration neurorepair Alzheimer’s disease Parkinson’s disease

Perception of the Muller-Lyer illusion in guppies

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2020年第2期66卷 205-213页

作者： Maria SANTACA christian AGRILLO Department of General Psychology University of PadovaVia Venezia 8Padova 35131Italy

The Muller-Lyer illusion is a well-known distortion illusion that occurs when the spatial arrangement of inducers(i.e.,inwards-or outwards-pointing arrowheads)influences a line's perceived relative *** date,this illusion has been reported in several animal species but only in 1 teleost fish(i.e.,redtail splitfins Xenotoca eiseni),although teleost fish represent approximately 50%of vertebrate *** investigated the perception of this illusion in another teleost fish:guppies Poecilia reticulata,a species that diverged from the redtail splitfin 65 million years *** guppies were trained to select the longer between 2 lines;after meeting the learning criterion,illusory trials were *** trials were also arranged to exclude the possibility that their choices were based on potential spatial biases that relate to the illusory *** guppies'overall performance indicated that they were susceptible to the Muller-Lyer illusion,perceiving the line with the inwards-pointing arrowheads as *** performance in the control trials excluded the possibility that the subjects used the physical differences between the 2 figures as the discriminative cue in the illusory *** study suggests that sensibility to the Muller-Lyer illusion could be widespread across teleost fish and reinforces the idea that the perceptual mechanisms underlying size estimation might be similar across vertebrates.

关键词： comparative perception Muller-Lyer illusion Poecilia reticulata visual illusions

Flame front detection by active contour method from OH-PLIF images under microgravity

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 Optics Letters 2006年第8期4卷 460-463页

作者：唐延东王岳 christian Eigenbrod Shenyang Institute of Automation Chinese Academy of Sciences Institute of Engineering Thermophysics Chinese Academy of Sciences ZARM Institute University of Bremen Bremen 28359Germany

It is difficult and high-cost to detect flame fronts by laser-sheet diagnostics under microgravity （μg）, thus image processing is critical to obtain valuable information from the raw data. In the present study, premixed V-flames were detected under μg by OH planar laser-induced fluorescence （PLIF） and an effective method based on active contour model （ACM） is presented for automatic detecting and tracking flame fronts in the PLIF images. ACM can effectively detect the flame front in the images with low contrast and noises. Compared with other methods of flame front detection, the advantage of this method is that the image smoothing and image enhancement are not necessary for the correct detection of flame fronts in raw PLIF images.

关键词： Fluorescence Image enhancement

Battle of the sexes:Which is better for you,high-or low-intensity exercise?

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2018年第4期7卷 429-432页

作者： christian cobbold school of science australian catholic universityBanyoQLD 4014Australia

Cardiovascular disease （CVD） accounts for more than 17 million deaths per year; however, morbidity statistics alone underestimate the scale of the problem because a significant proportion of the population live with CVD. Obesity and type 2 diabetes mellitus （T2DM） have significant influence on CVD initiation and progression, and obesity is independently associated with CVD, particularly among *** levels are rising rapidly in adults, but of particular concern is its swift rise in children and adolescents,who are at risk of remaining overweight into adult life4 in which long-term health consequences are most likely to manifest.5 In its simplest form, obesity arises because of an imbalance between energy intake and energy expenditure, with excess triglycerides being stored in adipocytes, which can increase in both size and *** results in numerous potentialadverse effects such as sleep apnea, increased incidence of osteoarthritis,and psychological impact,s but adipocytes also act as an endocrine organ secreting hormones and cytokines such as retinol-binding protein 4 （RBP-4） and adiponectin. In obesity, adiponectin levels decrease and RBP-4 levels increase, the effects of which enhance insulin resistance, thus increasing T2DM risk.9 Individuals with T2DM have a several-fold increased risk of CVD, and many of the risk factors for obesity, T2DM, and CVD overlap highlighting the interlinking complexity of these pathologic processes： poor diet, age, gender, ethnicity, smoking, dyslipidemia, hypertension, and physical inactivity, to name a few.

关键词：战争风险因素 CVD 胰岛素抵抗成年人肥胖心血管糖尿病

Saliva:a challenging human fluid to diagnose brain disorders with a focus on Alzheimer's disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2023年第12期18卷 2606-2610页

作者： Christine Zürcher christian Humpel University Hospital for Restorative Dentistry and Periodontology Medical University of InnsbruckInnsbruckAustria Laboratory of Psychiatry&Experimental Alzheimer’s Research Department of Psychiatry IMedical University of InnsbruckInnsbruckAustria

Biomarkers are molecules of biological processes that help in both the diagnosis of human diseases and in follow-up assessments of therapeutic responses. Biomarkers can be measured in many human fluids, such as blood, cerebrospinal fluid, urine, and saliva. The-omics methods(genomics, RNomics, proteomics, and metabolomics) are useful at measuring thousands of markers in a small volume. Saliva is a human fluid that is easily accessible, without any ethical concerns. Yet, saliva remains unexplored in regard to many human disease biomarkers. In this review, we will give an overview on saliva and how it can be influenced by exogenous factors. As we focus on the potential use of saliva as a diagnostic tool in brain disorders(especially Alzheimer's disease), we will cover how saliva is linked to the brain. We will discuss that saliva is a heterogeneous human fluid, yet useful for the discovery of biomarkers in human disorders. However, a procedure and consensus that is controlled, validated, and standardized for the collection and processing of saliva is required, followed by a highly sensitive diagnostic approach.

关键词： Alzheimer's disease biomarkers diagnosis oral-gut-brain axis periodontitis saliva