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  1. Book ; Online: Converse negative imaginary theorems

    Khong, Sei Zhen / Zhao, Di / Lanzon, Alexander

    2023  

    Abstract: Converse negative imaginary theorems for linear time-invariant systems are derived. In particular, we provide necessary and sufficient conditions for a feedback system to be robustly stable against various types of negative imaginary (NI) uncertainty. ... ...

    Abstract Converse negative imaginary theorems for linear time-invariant systems are derived. In particular, we provide necessary and sufficient conditions for a feedback system to be robustly stable against various types of negative imaginary (NI) uncertainty. Both marginally stable and exponentially stable uncertain NI systems with restrictions on their static or instantaneous gains are considered. It is shown that robust stability against the former class entails the well-known strict NI property, whereas the latter class entails a new type of output strict NI property that is hitherto unexplored. We also establish a non-existence result that no stable system can robustly stabilise all marginally stable NI uncertainty, thereby showing that the uncertainty class of NI systems is too large as far as robust feedback stability is concerned, thus justifying the consideration of subclasses of NI systems with constrained static or instantaneous gains.

    Comment: This paper has been submitted for possible publication at Automatica
    Keywords Electrical Engineering and Systems Science - Systems and Control ; Mathematics - Optimization and Control
    Subject code 515
    Publishing date 2023-06-03
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Buschke-Lowenstein tumor and pregnancy: a case report.

    Crespo, R / Puig, F / Lanzon, A / Borell, A

    European journal of gynaecological oncology

    2007  Volume 28, Issue 4, Page(s) 328–329

    Abstract: Buschke-Lowenstein tumor is a giant condyloma acuminatum that arises on the male and female anogenital region. It is considered a histologically benign tumor but carries a risk of malignant transformation. Early diagnosis and treatment are advised and ... ...

    Abstract Buschke-Lowenstein tumor is a giant condyloma acuminatum that arises on the male and female anogenital region. It is considered a histologically benign tumor but carries a risk of malignant transformation. Early diagnosis and treatment are advised and the choice of treatment is crucial. We present a case of a 31-year-old pregnant woman with myasthenia gravis affected by Buschke-Lowenstein tumor.
    MeSH term(s) Adult ; Cesarean Section ; Condylomata Acuminata/complications ; Condylomata Acuminata/pathology ; Condylomata Acuminata/surgery ; Female ; Fetal Membranes, Premature Rupture ; Humans ; Myasthenia Gravis/complications ; Pregnancy ; Pregnancy Complications, Neoplastic/surgery ; Twins ; Vulvar Neoplasms/complications ; Vulvar Neoplasms/pathology ; Vulvar Neoplasms/surgery
    Language English
    Publishing date 2007-07-17
    Publishing country China
    Document type Journal Article
    ZDB-ID 604589-3
    ISSN 0392-2936
    ISSN 0392-2936
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    Zs.A 1679: Show issues Location:
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  3. Book ; Online: Generalizing Negative Imaginary Systems Theory to Include Free Body Dynamics

    Mabrok, M. A. / Kallapur, A. G. / Petersen, I. R. / Lanzon, A.

    Control of Highly Resonant Structures with Free Body Motion

    2013  

    Abstract: Negative imaginary (NI) systems play an important role in the robust control of highly resonant flexible structures. In this paper, a generalized NI system framework is presented. A new NI system definition is given, which allows for flexible structure ... ...

    Abstract Negative imaginary (NI) systems play an important role in the robust control of highly resonant flexible structures. In this paper, a generalized NI system framework is presented. A new NI system definition is given, which allows for flexible structure systems with colocated force actuators and position sensors, and with free body motion. This definition extends the existing definitions of NI systems. Also, necessary and sufficient conditions are provided for the stability of positive feedback control systems where the plant is NI according to the new definition and the controller is strictly negative imaginary. The stability conditions in this paper are given purely in terms of properties of the plant and controller transfer function matrices, although the proofs rely on state space techniques. Furthermore, the stability conditions given are independent of the plant and controller system order. As an application of these results, a case study involving the control of a flexible robotic arm with a piezo-electric actuator and sensor is presented.
    Keywords Mathematics - Optimization and Control
    Subject code 531 ; 629
    Publishing date 2013-05-05
    Publishing country us
    Document type Book ; Online
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  4. Article ; Online: Gigantomastia in a patient with systemic lupus erythematosus successfully treated by reduction mammoplasty.

    Lanzon, A E / Navarra, S V

    Lupus

    2009  Volume 18, Issue 14, Page(s) 1309–1312

    Abstract: The objective of the study was to describe a Filipino woman with systemic lupus erythematosus (SLE) who developed gigantomastia associated with hyperoestrogenemia and successfully treated by reduction mammoplasty. A 37-year-old Filipino woman with SLE of ...

    Abstract The objective of the study was to describe a Filipino woman with systemic lupus erythematosus (SLE) who developed gigantomastia associated with hyperoestrogenemia and successfully treated by reduction mammoplasty. A 37-year-old Filipino woman with SLE of 5-year duration presented with enlargement of breasts, which became more noticeable and progressive during disease flares requiring increased steroid dose (+ or - 40 mg/day). Following control of the last SLE flare, with prednisone effectively tapered to 15 mg/day, she consented to surgical breast reduction. Preoperative physical examination recorded the right and left breast measurement of 61 cm and 54.5 cm from sternal notch to nipple tip, respectively. serum oestrogen assay was elevated. She successfully underwent reduction mammoplasty with free nipple graft, with an uneventful postoperative course. The breast tissue oestrogen and progesterone receptor assays were strongly positive. In the succeeding months, SLE disease remained stable with prednisone tapered to 10 mg daily. This case illustrates a rare occurrence of gigantomastia associated with hyperoestrogenemia in a patient with SLE, successfully treated with reduction mammoplasty.
    MeSH term(s) Adult ; Breast Diseases/etiology ; Breast Diseases/surgery ; Estrogens/blood ; Female ; Glucocorticoids/therapeutic use ; Humans ; Lupus Erythematosus, Systemic/complications ; Mammaplasty/methods ; Nipples/surgery ; Prednisone/therapeutic use
    Chemical Substances Estrogens ; Glucocorticoids ; Prednisone (VB0R961HZT)
    Language English
    Publishing date 2009-12
    Publishing country England
    Document type Case Reports ; Journal Article
    ZDB-ID 1154407-7
    ISSN 1477-0962 ; 0961-2033
    ISSN (online) 1477-0962
    ISSN 0961-2033
    DOI 10.1177/0961203309106690
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.A 3717: Show issues Location:
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  5. Article: Fallopian tube carcinoma: incidental finding during surgery for acute pelvic inflammatory disease--case report.

    Puig, F / Lapresta, M / Lanzon, A / Crespo, R

    European journal of gynaecological oncology

    2006  Volume 27, Issue 5, Page(s) 526–527

    Abstract: Background: Primary carcinoma of the fallopian tube is a rare condition. Preoperative diagnosis is difficult and in most cases it is an intraoperative finding or a histopathological diagnosis.: Case: A 49-year-old woman presented with pelvic pain, ... ...

    Abstract Background: Primary carcinoma of the fallopian tube is a rare condition. Preoperative diagnosis is difficult and in most cases it is an intraoperative finding or a histopathological diagnosis.
    Case: A 49-year-old woman presented with pelvic pain, fever (38 degrees C), elevated white blood cell count and a right adnexal mass. Pelvic inflammatory disease was suspected and broad spectrum antibiotics were established. Five days later, due to lack of clinical response, a total abdominal hysterectomy, bilateral salpingo-oophorectomy and appendectomy were performed. Histopathology showed a primary fallopian tube carcinoma. Postoperatively she received chemotherapy. Afterwards she underwent a staging laparotomy. Some months later, new chemotherapy regimens were instituted because of the presence of lymph node metastases.
    Conclusion: Malignancy should be included in the differential diagnosis of pelvic inflammatory disease.
    MeSH term(s) Acute Disease ; Adenocarcinoma/diagnosis ; Adenocarcinoma/secondary ; Adenocarcinoma/therapy ; Antineoplastic Combined Chemotherapy Protocols/therapeutic use ; Appendiceal Neoplasms/diagnosis ; Appendiceal Neoplasms/therapy ; Chemotherapy, Adjuvant ; Fallopian Tube Neoplasms/diagnosis ; Fallopian Tube Neoplasms/therapy ; Female ; Humans ; Lymphatic Metastasis ; Middle Aged ; Pelvic Inflammatory Disease/surgery ; Proteins/analysis
    Chemical Substances NBR1 protein, human ; Proteins
    Language English
    Publishing date 2006-10-12
    Publishing country China
    Document type Case Reports ; Journal Article
    ZDB-ID 604589-3
    ISSN 0392-2936
    ISSN 0392-2936
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Formation of a delta 7 triterpene alcohol in refined olive oils

    Lanzon, A / Albi, T / Guinda, A

    Journal of the American Oil Chemists' Society. Dec 1999. v. 76 (12)

    1999  

    Keywords olive oil
    Language English
    Dates of publication 1999-12
    Size p. 1421-1423.
    Document type Article
    ZDB-ID 240684-6
    ISSN 1558-9331 ; 0003-021X
    ISSN (online) 1558-9331
    ISSN 0003-021X
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Aislamiento y cuantificación de los componentes de la hoja del olivo

    Albi, T. / Rios, J. J. / Lanzón, A. / Guinda, Á.

    Grasas y Aceites, Vol 53, Iss 4, Pp 419-

    extracto de hexano

    2002  Volume 422

    Abstract: The principal components of the hexane extract from olive leaves are analysed, following an analytical procedure based on the extraction with hexane and the later separation of groups of compounds, according to their polarity, by means of column and thin- ...

    Abstract The principal components of the hexane extract from olive leaves are analysed, following an analytical procedure based on the extraction with hexane and the later separation of groups of compounds, according to their polarity, by means of column and thin-layer chromatographies. The following components are separated and identified: hydrocarbons, ester waxes, triglycerides, tocopherols, esterols, lineal and terpenic alcohols and terpenic dialcohols. The olive leaves from five different varieties were analyzed: Picual, Arbequina, Hojiblanca, Empeltre and Cornicabra; the concentration of some compounds ranged between: 2.057-3.400 ppm saturated hydrocarbons; 38-152 ppm squalene; 915-1.874 ppm ester waxes; 28-100 ppm β-carotene; 832-1.396 ppm triglycerides; 41-125 ppm α-tocopherol; 614-2.500 ppm β-sitosterol; 95-311 ppm alcohols and 342-837 ppm terpenic dialcohols. Se analizan los principales componentes del extracto de hexano de hojas de olivo, siguiendo un esquema analítico basado en la extracción con hexano y posterior separación de grupos de compuestos, según su polaridad, mediante cromatografía en columna y en capa fina. Se separan e identifican los siguientes componentes: hidrocarburos, ceras ésteres, triglicéridos, tocoferoles, esteroles, alcoholes lineales y terpénicos y dialcoholes terpénicos. Se han estudiado las hojas de olivo de cinco variedades: Picual, Arbequina Hojiblanca, Empeltre y Cornicabra, los rangos del contenido, en ppm, de algunos compuestos resultaron: hidrocarburos saturados, 2.057-3.400; escualeno, 38-152; ceras ésteres, 915-1874; β -caroteno, 28-100; triglicéridos, 832-1.396; α -tocoferol, 41-125; β-sitosterol, 714-2.500 alcoholes totales 95-311 y dialcoholes terpénicos, 342-837.
    Keywords Analysis ; Liposoluble compound ; Olive leaf ; Análisis ; Componentes liposolubles ; Hoja de olivo ; Nutrition. Foods and food supply ; TX341-641 ; Home economics ; TX1-1110 ; Technology ; T ; DOAJ:Nutrition and Food Sciences ; DOAJ:Agriculture and Food Sciences
    Language English
    Publishing date 2002-12-01T00:00:00Z
    Publisher Consejo Superior de Investigaciones Científicas
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Book: A model reference approach to safe controller changes in iterative identification and control

    Lecchini, A / Anderson, B. D. O / Lanzon, A

    (CUED/F-INFENG/TR ; 527)

    2005  

    Author's details A. Lecchini; A. Lanzon; B. D. O. Anderson
    Series title CUED/F-INFENG/TR ; 527
    Language English
    Size 20 S
    Publisher Dep. of Engineering, Univ
    Publishing place Cambridge
    Document type Book
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  9. Article ; Online: Procedimiento de obtención y determinación de ácidos terpénicos de la hoja del olivo ( Olea europaea )

    Lanzón, A. / Guinda, A. / Albi, T.

    Grasas y Aceites, Vol 52, Iss 5, Pp 275-

    2001  Volume 278

    Abstract: The terpenic acids, mainly the oleanolic acid, are used for the pharmaceutical industry, among other, for its antitumoral, anti-inflammatory and germicide activities. A process of obtainment of oleanolic acid from olive leaves is described. Solid/liquid ... ...

    Abstract The terpenic acids, mainly the oleanolic acid, are used for the pharmaceutical industry, among other, for its antitumoral, anti-inflammatory and germicide activities. A process of obtainment of oleanolic acid from olive leaves is described. Solid/liquid extraction with ethanol, treatment of the extract and concentration under defined conditions, being possible to obtain in a single extraction stage a yield of 90 % of the leaf content (2-3 %, referred to the leaf weight) and with richness in excess of 95 %. The raw material is a by-product, coming from that of pruning yearly of the olive grove and of the cleaning of the olives. A method is described for the quantification of the terpenic acids from olive leaf of the alcoholic extract, by preparative thin layer chromatography fractionation and gas liquid chromatography quantification with betulinic acid standard. Los ácidos terpénicos y en particular el ácido oleanólico son de utilidad en la industria farmacéutica, entre otras, por su actividad antitumoral, antiinflamatoria y bactericida. Se describe un procedimiento para la obtención de ácido oleanólico, de las hojas de olivo, mediante extracción sólido/líquido con etanol, posterior tratamiento del extracto y concentración en condiciones definidas, siendo posible obtener en una sola etapa de extracción un rendimiento del 90 % del contenido de la hoja (2-3 %, referido al peso de hoja), y con un grado de pureza superior al 95 %. La materia prima es un subproducto, procedente de la poda anual del olivar y de la limpieza de las aceitunas. Se describe un método para la cuantificación de los ácidos terpénicos del extracto alcohólico de la hoja de olivo mediante el fraccionamiento en cromatografía preparativa en capa fina y cuantificación por cromatografía gaseosa con patrón de ácido betulínico.
    Keywords Oleanolic acid ; Olive leaf ; Terpenic acids ; Ácido oleanólico ; Ácidos terpénicos ; Hoja de olivo ; Nutrition. Foods and food supply ; TX341-641 ; Home economics ; TX1-1110 ; Technology ; T ; DOAJ:Nutrition and Food Sciences ; DOAJ:Agriculture and Food Sciences
    Language English
    Publishing date 2001-10-01T00:00:00Z
    Publisher Consejo Superior de Investigaciones Científicas
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article: The hydrocarbon fraction of virgin olive oil and changes resulting from refining

    Lanzon, A / Albi, T / Cert, A / Gracian, J

    Journal of the American Oil Chemists' Society. Mar 1994. v. 71 (3)

    1994  

    Keywords olive oil ; purification ; fractionation ; hydrocarbons ; quantitative analysis
    Language English
    Dates of publication 1994-03
    Size p. 285-291.
    Document type Article
    ZDB-ID 240684-6
    ISSN 1558-9331 ; 0003-021X
    ISSN (online) 1558-9331
    ISSN 0003-021X
    Database NAL-Catalogue (AGRICOLA)

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