scholarly journals Dynamics Modeling and Simulation of a Net Closing Mechanism for Tether-Net Capture

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Jiyue Si ◽  
Zhaojun Pang ◽  
Zhonghua Du ◽  
Jie Fu

Tether-net is a promising active debris removal technique, and a closing mechanism can ensure the reliable wrapping of space debris by using tether-net. This study focuses on the dynamics model of the split closing mechanism and the sliding joint between thread and ring. First, a new kind of closing mechanism is proposed, which drives the closing thread to close the net mouth through the split masses, and the mass-spring-damper method is used to model tether-net. Thereafter, for the first time, the model of thread-ring sliding joint is proposed based on the mass-spring-damper method, which can be used to simulate the closing process of tether-net. Finally, one-edge closure experiment of the net is carried out and the experimental results are compared with the simulation results, and the closing process of the tether-net is simulated by using the thread-ring sliding joint. Results reveal that the thread-ring sliding joint can be used to simulate the relative slip between the thread and the ring, and the tether-net can wrap the target reliably in a short time by using the split closing system. The split closing mechanism can make it possible for the tether-net to close successfully, whether it starts to work before or after the net contacts with the target.

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lan N. Truong ◽  
Brayden D. Whitlock

AbstractControlling infections has become one of the biggest problems in the world, whether measured in lives lost or money spent. This is worsening as pathogens continue becoming resistant to therapeutics. Antimicrobial surfaces are one strategy being investigated in an attempt to decrease the spread of infections through the most common route of transmission: surfaces, including hands. Regulators have chosen two hours as the time point at which efficacy should be measured. The objectives of this study were to characterize the new antimicrobial surface compressed sodium chloride (CSC) so that its action may be understood at timepoints more relevant to real-time infection control, under two minutes; to develop a sensitive method to test efficacy at short time points; and to investigate antifungal properties for the first time. E. coli and Candida auris are added to surfaces, and the surfaces are monitored by contact plate, or by washing into collection vats. An improved method of testing antimicrobial efficacy is reported. Antimicrobial CSC achieves at least 99.9% reduction of E. coli in the first two minutes of contact, and at least 99% reduction of C. auris in one minute.


Author(s):  
Daniele Tognetto ◽  
Marco R. Pastore ◽  
Gian Marco Guerin ◽  
Giuliana Decorti ◽  
Martina Franzin ◽  
...  

Abstract Purpose In the era of antibiotic resistance, there is an increased interest in antiseptic solutions that might represent a reliable option for ocular surface disinfection. The objective of this study is to compare for the first time three different antiseptic ophthalmic preparations to assess their in vitro antimicrobial activity. Methods The antiseptic activity of three commercial ophthalmic solutions, IODIM (povidone-iodine 0.6% in hyaluronic acid vehicle—Medivis, Catania, Italy), OZODROP (nanoemulsion with ozonated oil—concentration not specified—FBVision, Ophthalmic Pharmaceuticals, Rome, Italy), and DROPSEPT (chlorhexidine 0.02% and vitamin E 0.5% Tocopherol Polyethylene Glycol 1000 Succinate—TPGS, Sooft Italia, Montegiorgio, Italy), was tested in vitro on six reference strains by time-killing assays. Viable cells were evaluated after 1, 15, 30 min; 2, 6, and 24 h exposure by seeding 100 µl of the suspension (or appropriate dilutions) on LB agar or Sabouraud-dextrose agar. All plates were incubated at 37 °C for 24 h and evaluated by manually counting the colonies. Results IODIM solution showed a very rapid microbicidal activity: the number of viable cells for all the tested strains was under the detection limit (less than 10 CFU/ml) already after 1 min exposure, and this result was maintained at every incubation time. The rapid antimicrobial activity of povidone-iodine was not replicated when testing the other two antiseptics. Conclusions The study reports the great efficacy in reducing bacterial load in a very short time of povidone-iodine 0.6% compared with other antiseptic preparations.


Author(s):  
И.А. Куклин ◽  
Н.П. Малишевская ◽  
М.М. Кохан ◽  
Г.Д. Сафонова ◽  
О.Г. Римар ◽  
...  

В статье представлен краткий обзор литературы о клинических проявлениях, современных методах диагностики и лечения чрезвычайно редкого заболевания – множественной эруптивной кератоакантомы типа Гржебовски. Заболевание характеризуется возникновением сотен или тысяч генерализованных зудящих узелков на коже лица, туловища, конечностей, половых органов, слизистой полости рта и гортани в течение короткого времени. Заболевание развивается в возрасте старше 40 лет, имеет рецидивирующее течение, возможна спонтанная инволюция отдельных элементов с формированием участков депигментации или атрофических рубцов. Авторы приводят случай собственного клинического наблюдения множественной эруптивной кератоакантомы типа Гржебовски у пациента 50 лет, который обратился на консультацию к дерматовенерологу в клинику Уральского НИИ дерматовенерологии и иммунопатологии. Длительность болезни на момент обращения составляла 2,5 года, ее возникновению предшествовало неоднократное посещение больным стран с избыточной инсоляцией, что может рассматриваться в качестве этиологического фактора развития заболевания. Диагноз впервые был заподозрен на консилиуме дерматовенерологов на основании клинической картины заболевания и в дальнейшем верифицирован данными патоморфологического исследования биоптата пораженной кожи. Показана эффективность применения ароматических ретиноидов в лечении множественной эруптивной кератоакантомы типа Гржебовски и приведены побочные эффекты, которые развились у больного при самостоятельном увеличении дозы ацитретина до 70 мг/сутки. В статье констатируется чрезвычайно редкая встречаемость данного заболевания, о чем свидетельствует приведенный клинический случай, диагностируемый впервые более чем за 90-летнюю историю существования института. Подчеркивается важность консолидации клинического опыта нескольких ведущих дерматовенерологов для диагностики множественной эруптивной кератоакантомы типа Гржебовски. The article presents a brief review of the literature about clinical manifestations, modern methods of diagnosticsand treatment of an extremely rare disease – generalized eruptive keratoacanthomas of Grzybowski. The disease is characterized by the appearance of hundreds or thousands of generalized itchy nodules on the skin of the face, trunk, limbs, genitals, oral mucosa and larynx within a short time. The disease develops at the age of over 40, has a recurrent course, spontaneous involution of individual elements with the formation of areas of depigmentation or atrophic scars is possible. The authors describe a case of their own clinical care of generalized eruptive keratoacanthomas of Grzybowski in a 50-year-old patient who consulted a dermatovenerologist at the clinic of the Ural Research Institute of Dermatovenerology and Immunopathology.The duration of the disease at the time of visit to a doctor was 2,5 years, its occurrence was preceded by repeated visits to countries with excessive insolation, which can be considered as an etiological factor in the development of the disease. The diagnosis was first suspected at a boarddermatovenerologists based on the clinical picture of the disease and subsequently verified by the data of a pathomorphological examination of the biopsy of the affected skin.The effectiveness of the use of aromatic retinoids in the treatment of generalized eruptive keratoacanthomas of Grzybowski is shown and the side effects that developed in the patient with an independent increase in the dose of acitretin to 70 mg/day are given. The article states the extremely rare occurrence of this disease, as evidenced by the above clinical case, diagnosed for the first time in more than 90 years of the institute's existence. The importance of consolidating the clinical experience of several leading dermatovenerologists for the diagnostics of generalized eruptive keratoacanthomas of Grzybowski is emphasized.


2021 ◽  
pp. 1-9
Author(s):  
Yusuke Oki ◽  
Hiroyuki Okamoto ◽  
Takahiro Sasaki ◽  
Toru Yamamoto ◽  
Keiichi Wada

2020 ◽  
pp. 1043-1061
Author(s):  
Nikita Veliev ◽  
Anton Ivanov ◽  
Shamil Biktimirov

Synlett ◽  
2017 ◽  
Vol 29 (10) ◽  
pp. 1314-1318 ◽  
Author(s):  
Charles Diesendruck ◽  
Sinai Aharonovich ◽  
Nansi Gjineci ◽  
Dario Dekel

Tetraaryl ammonium salts are a synthetic challenge, since there is no general method for the arylation of triaryl amines. Contrary to other quaternary ammonium salts, tetraaryl ammonium salts should be very chemically stable. The ipso carbons are not very electrophilic, since the positive charge is distributed throughout the pi systems and they have no acidic β hydrogens. Here we demonstrate a simple approach to N,N-diphenyl carbazolium salts using only three synthetic steps, allowing for an easy production of these salts in large amounts and in a relatively short time. In addition, we study the Cu(I) catalyzed multi-arylation of 2,2’-diaminobiphenyl, focusing on the regioselectivity of each step. Finally, we characterize, for the first time, the solid state structure of a tetraaryl ammonium salt.


2021 ◽  
Vol 20 (4) ◽  
pp. 480-492
Author(s):  
Vladimir N. Shaidurov ◽  
Valentina A. Veremenko

General of the Infantry Count G.M. Sprengtporten (1740-1819) is one of the less known historical figures of the last quarter of the 18th and of the early 19th century. As a Swedish citizen, he hatched plans to turn Finland into an independent state. In the mid-1780s he saw in Catherine II a potential ally who could implement his ideas. After accepting the invitation to enter Russian service, Sprengtporten did not blend either in the Highest Court or in the Russian army. Not having shown any significant military feats during the wars of the late 18th and early 19th centuries, he distinguished himself in the diplomatic and lawmaking field. An important event was his mission to Europe (1800-1801), which resulted in the return of more than six thousand Russian prisoners to Russia. The draft Regulations on the Establishment of the Main Administration in New Finland, developed by Sprengtporten with some changes made by Emperor Aleksander I, became the cornerstone of Finnish autonomy within the Russian Empire over the next century. Occupying for a short time the post of Governor General, he became a link between Finland and Russia. The scientific novelty of the article lies in the comprehensive presentation of the Russian service of G.M. Sprengtporten. The article is written on the basis of published sources and unpublished documents from some central archives, which are introduced into scientific circulation for the first time.


2011 ◽  
Vol 2011 (1) ◽  
pp. 000169-000172
Author(s):  
André Rouzaud ◽  
Nicolas Sillon ◽  
Mark Scannell ◽  
David Henry ◽  
T. Mourier

In a first time confined to labs and then R&D centers, 3D integration technologies have now gained maturity and are now penetrating the industrial world. More and more, R&D centers are approached to back the industrial developments with associated constraints of swift product development, prototyping, and short time-to- market. To face this paradigm, Léti has developed a specific two-step approach in the field of 3D integration, including both a very advanced R&D part focused on the most promising technologies and integration flows, and the industrial validation of the most mature process flows already assessed at the laboratory scale or on specific industrial themes. This talk aims to detail the two aspects of this dual approach:-In the first part, we will give an overview of the innovative R&D performed on the still nascent and most promising integration flows, as well as the associated technological means.-in the second part, we will present the prototyping activities that Léti is now offering. Based on a limited number of mature and already validated process steps (bonding and thinning, TSV, bumping, stacking) this generic integration scheme allows industrial customers to assess on their own wafers the benefits of an innovative 3D integration.


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