Re: The Movie Based On The Book Push
Violetta Wagganer
In every tech talk, or in every blog post I've read about IEnumerable and IObservable I read that,IEnumerable is pull-based structure andIObservable is push-based structure.
IEnumerable is just a sequence of pulls; you call MoveNext every time you want to pull a result and you get a T. IObservable is just a sequence of pushes; you register a callback, and it is called every time a new T is available.
This idea existed in C# before IObservable and await. Another way to look at is is: pull-based is like function calls, push-based is like event handlers. A normal function call, you call it when you want something. An event handler, it calls you when something happens. Events are how the C# language itself represents the observer pattern. But events always logically form a sequence, so it makes sense to be able to manipulate a sequence of pushed items the same way we'd manipulate a sequence of pulled items. And hence, IObservable was invented.
Pull-based describes a client-run scheme: Clients make requests, and the data is served up immediately. Push-based describes a server-run scheme: Clients can connect to a push-stream (IObservable), but they can't demand data, they get it when the server feels like giving it.
A canonical form of pull would be a database query: You send a request to the server, and the server responds with a collection of items. A canonical version of push would be a chat app: The chat client can't 'demand' new conversation data, the server will tell you when the other person has said something.
For salient, efficient and individualistic app development that overcomes various programming impediments, Push-based solutions ensure that your large applications are maintainable, competitive and state-of-the-art.
Is this scenario possible? Is it possible to check the users position e.g. every 10 minutes even when the application is killed, and when in range fire a local push? How much battery would it drain? If the user closes the GPS would it try to use 3G/wifi signal to get the position?
Beetle preference measured using the four-choice olfactometer was analyzed using a two-tailed, paired t-test in GraphPad Prism 7.05 (GraphPad Software, La Jolla, CA, USA). Field results were analyzed using a Generalized Linear Model (Proc GLM) to perform a repeated measures analysis of variance in SAS 9.4 (SAS, Cary, NC, USA). For the first field trial, the fixed variables in the model were: days after treatment (DAT), block, treatment, and trap distance. For the push-pull experiment, the fixed variables were: DAT, block, push (repellent), pull (attractant), and trap distance. A priori contrasts were applied to determine which treatment differed when significant difference were found. Analyses of community composition were performed with the statistical software R v 3.3.1 (R core team, Vienna, Austria). Diversity of Scolytineae beetles was examined with a principal component analysis (PCA) conducted with the package FactoMineR36. Linear correlation between principal components and beetle density were subsequently conducted.
Principal component analysis of ambrosia beetle (Coleoptera: Curculionidae: Scolytinae and Platypodinae) species collected in avocado orchards in presence of push-pull treatments. (A) Contributions of beetle species on the first and second principal components. (B) Confidence ellipses highlighting the effects of ethanol lures, and methyl salicylate (MeSA) and verbenone on beetle catch on monitoring traps.
With the high risk of laurel wilt to avocado orchards in southern Florida, it is essential to develop tools for prevention and management of immigrating ambrosia beetles. It is unclear which specific species contribute most to disease spread in avocado or their proportional contribution as vectors7,9. With the threat of lateral pathogen spread between various species, it is a conservative approach to assume all species are potentially capable of promoting pathogen spread. The push-pull strategy of applying combined repellent and attractant stimuli in order to manipulate the distribution of a pest is an integrated pest management tool that has been established in several systems39. The use of repellents has been successful in natural stands of Laureacae against laurel wilt27, but in a monoculture, agricultural setting, we hypothesized that the additional pull treatment may be necessary to affect beetle populations based on our first trial where repellents alone in avocado were ineffective.
Management is crucial to prevention of the spread of laurel wilt within avocado orchards. Our results suggest that the push-pull strategy may hold promise as a management tool for this pathosystem and deserves further investigation. It is unlikely that it could adequately manage beetle populations as a stand-alone treatment and would likely function best in association with additional preventive measures such as removal of infected trees. Several follow up investigations are warranted. It is possible that long-term effects of beetle population suppression with push-pull could reduce disease incidence over time, if semiochemicals were deployed on an area-wide scale (see Conlong et al.)49. This could be evaluated by tracking infections in high-risk Lauraceous hosts occurring nearby commercial avocado19 in addition to infection sentinels monitored within treated avocado50. If fully refined, a push-pull approach would benefit from a complementary integrated pest management program against laurel wilt that includes removal and destruction of infected trees. Furthermore, the economic viability of this potential tactic with and without fungicide treatments deserves further investigation.
Background: The aim was to compare the dislodgement resistance of calcium silicate-based sealers (Total Fill BC Sealer, Endo CPM Sealer, BioRoot RCS) with an epoxy resin-based sealer (AH Plus).
Methods: The root canals of 80 single-rooted human teeth were instrumented with F360 up to size 45.04. All canals were obturated using matching gutta-percha cones according to the single-cone technique in combination with one of the mentioned sealers (n = 20 per group). After eight weeks of incubation (37 C, 100% humidity), the roots were embedded in resin. Starting with a distance of 7 mm from the apex, four slices of 1 mm thickness were cut. Dislodgement resistance was measured using a universal testing machine and the push-out bond strength was calculated. Specimens were examined under 4-magnification to determine the mode of bond failure. Statistical analysis was performed using ANOVA and Student-Newman-Keuls-test.
Results: Regarding the pooled data of all sections, the push-out bond strength of AH Plus was significantly higher than the push-out bond strength of all calcium silicate-containing sealers (P < 0.05). Out of all calcium silicate-based sealers, Total Fill BC Sealer showed the highest push-out bond strength (P < 0.05). BioRoot RCS had significant higher push-out bond strength than Endo CPM Sealer (P < 0.05). Nearly the same results were found for all four sections. BioRoot RCS only differed significantly from Endo CPM Sealer in the third section (P < 0.05).
Conclusions: The push-out bond strength of the investigated calcium silicate-based sealers was lower than of AH Plus. Total Fill BC showed the highest push-out bond strength of the calcium silicate-based sealers.
A company using the push system will forecast demand and employ the Material Requirements Planning (MRP) process to produce goods and services ahead of time. This is related to the Just-in-Case concept.
The Material Requirements Planning (MRP) mentioned above is a push system since there are no prior WIP limitations. Goods are produced under the master production schedule with no regard to the current status.
Winfrey used her status as both a celebrity and a media personality to give the film what was described by Ben Child of The Guardian, as a "high-profile promotional push."[20][36] At a press conference Winfrey announced her intention to lead a promotional campaign on behalf of Precious along with her other various platforms, hoping to be able to "bring in different audiences" by promoting the film on her show, in her magazine and on her satellite-radio channel.[20] Katie Walmsley of CNN remarked, based on the film's positive reception at the Toronto Film Festival, that the film "at the very least, the [Toronto] award will guarantee "Precious" substantial distribution, as well as exposure for two-time director Daniels."[35] The trailer for Precious was shown during previews of the film's producer Perry's film I Can Do Bad All By Myself in September 2009.[37]
Precious received favorable reviews from film critics, particularly for Sidibe's and Mo'Nique's performances. Review aggregator Rotten Tomatoes reports that 92% of 238 critics gave the film a positive review, with a rating average of 7.80/10. The site's consensus is that "Precious is a grim yet ultimately triumphant film about abuse and inner-city life, largely bolstered by exceptional performances from its cast."[43] Metacritic, which assigns a normalized rating out of 100 to reviews from film critics, gave the film a rating score of 79 based on 36 reviews, indicating "Generally favorable reviews".[44]
John Anderson of Variety said "to simply call it harrowing or unsparing doesn't quite cut it," having felt that the film is "courageous and uncompromising, a shaken cocktail of debasement and elation, despair and hope."[45] Anderson cited Carey's performance as "pitch perfect" and Patton's role as Ms. Blu Rain as "disarming."[45] Owen Gleiberman of Entertainment Weekly praised Carey's performance, describing it as having been "an authentically deglammed compassion" and praised the film for capturing "how a lost girl rouses herself from the dead" and for Daniels showing "unflinching courage as a filmmaker by going this deep into the pathologies that may still linger in the closets of some impoverished inner-city lives."[46] Gleiberman described the film as being a movie "that makes you think, 'There but for the grace of God go I.' [...] It's a potent and moving experience, because by the end you feel you've witnessed nothing less than the birth of a soul", and felt that the "final scene of revelation" between Sidibe's and Mo'Nique's characters was strong enough to be able to leave viewers "tearful, shaken, [and] dazed with pity and terror."[46] He identified how Daniels uses one of the rich scenes created by Fletcher to position Mo'Nique in a painful confrontation with Sidibe that results in a masterful and thought-provoking performance that delivers the final "push" needed by Sidibe: "The more Precious tries to get away from her mother, the more she's pulled back".[46]
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