My enviroement is angular8 and the babylonjs is ok ,and it can create sphere and run ok.
But when I use the SceneLoader.ImportMeshAsync to import mesh of localhost, it is not work. I debug the progress is finished however, the promise have not any response.
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Cellulose nanocrystals (CNCs) are biosourced chiral nanorods that can form stable colloidal suspensions able to spontaneously assemble above a critical concentration into a cholesteric liquid crystal, with a cholesteric pitch usually in the micron range. When these suspensions are dried on a substrate, solid films with a pitch of the order of few hundreds of nanometers can be produced, leading to intense reflection in the visible range. However, the resulting cholesteric nanostructure is usually not homogeneous within a sample and comports important variations of the cholesteric domain orientation and pitch, which affect the photonic properties. In this work, we first propose a model accounting for the formation of the photonic structure from the vertical compression of the cholesteric suspension upon solvent evaporation, starting at the onset of the kinetic arrest of the drying suspension and ending when solvent evaporation is complete. From that assumption, various structural features of the films can be derived, such as the variation of the cholesteric pitch with the domain tilt, the orientation distribution density of the final cholesteric domains and the distortion of the helix from the unperturbed cholesteric case. The angular-resolved optical response of such films is then derived, including the iridescence and the generation of higher-order reflection bands, and a simulation of the angular optical response is provided, including its tailoring under external magnetic fields. Second, we conducted an experimental investigation of CNC films covering a structural and optical analysis of the films. The macroscopic appearance of the films is discussed and complemented with angular-resolved optical spectroscopy, optical and electron microscopy, and our quantitative analysis shows an excellent agreement with the proposed model. This allows us to access the precise composition and the pitch of the suspension when it transited into a kinetically arrested phase directly from the optical analysis of the film. This work highlights the key role that the anisotropic compression of the kinetically arrested state plays in the formation of CNC films and is relevant to the broader case of structure formation in cast dispersions and colloidal self-assembly upon solvent evaporation.
Asymmetric Bouligand arches resulting from the distortion of the cholesteric order. (Left) SEM observation in cross-section of the sample from Fig. 14. (Right) Asymmetric Bouligand arches reproducing similar asymmetric arches (the asymmetry is illustrated by the position of the dashed line, drawn at the apex of the arch highlighted in red; see details in Appendix pp2).
To reiterate my response from another thread, this is not Jira cloud specific. This is how XmlHttpRequest works. Browsers will safeguard the end-user by making sure it only executes trusted client-side code.
The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.
Anisotropic materials are characterized by a unique optical response, which is highly polarization-dependent. Of particular interest are layered materials formed by the stacking of two-dimensional (2D) crystals that are naturally anisotropic in the direction perpendicular to the 2D planes. Black phosphorus (BP) is a stack of 2D phosphorene crystals and a highly anisotropic semiconductor with a direct band gap. We show that the angular dependence of polarized Raman spectra of BP is rather unusual and can be explained only by considering complex values for the Raman tensor elements. This result can be traced back to the electron-photon and electron-phonon interactions in this material.
Purpose: To measure ionization chamber dose response as a function of the angle between magnetic field direction and ionization chamber orientation in magnetic resonance-guided radiation therapy (MRgRT) system, and to evaluate angular dependence of magnetic field correction factor for reference dosimetry.
Methods: Measurements were performed on an Elekta MR-linac that integrates a 1.5-T Philips MRI and a 7-MV FFF photon beam accelerator. The response of four reference class chambers (Exradin-A19, A1SL, IBA FC65-G, and CC13, paired with a PTW UE electrometer) was studied. An in-house built MR-compatible water tank and an accompanying cylindrical insert that allowed chamber rotation around the cylinder's axis was used. The EPID onboard imaging was used to center chamber at the MR-linac isocenter (143.5 cm, SAD), as well as to verify position at each datapoint.
Results: A clear angular dependence of dose response for all chambers has been measured. The most significant effect of magnetic field on relative chamber response in the presence of magnetic field was observed in the orientation when chamber axis is perpendicular to the direction of magnetic field with the tip pointing in the same direction as Lorentz force. This effect is more pronounced for larger volume chambers; the maximum relative variation in the chamber response (between the setup described above and the one where chamber and magnetic field are parallel) is a 5.3% and 4.6% increase for A19 and FC65-G, respectively, and only 2.0% and 1.9% for smaller volume A1SL and CC13 chamber, respectively. We measured the absolute magnitude of the magnetic field correction factor k Q mag for the Exradin-A19, A1SL, IBA FC65-G, and CC13 to be 0.938 1.13%, 0.968 0.99%, 0.950 1.13%, and 0.975 1.13%, respectively. The values are for perpendicular orientation of the chamber relative to magnetic field and parallel to the Lorentz force.
Conclusions: Experimental measurements carried out in this study have verified the optimal orientation of ionization chamber in terms of minimizing effect of magnetic field on the chamber dose response. This study provides a detailed high-resolution measurement of absolute k Q mag values for four reference class chambers as a function of the angle between ionization chamber's central axis and the direction of strong magnetic field over a full 360 rotation. The experimental results of this study can further be used for optimization of the actual sensitive volume of the chamber (and analysis of dead volume) in future Monte Carlo chamber simulations in the presence of strong magnetic fields. In addition, it will provide some necessary data for future reference dosimetry protocols for MR-linac.
This post will be a quick practical guide for the Angular HTTP Client module. We will cover how to do HTTP in Angular in general. We will be using the new @angular/common/http module, but a good part of this post is also applicable to the previous @angular/http module.
The multiple versions of the Angular HTTP module all have an RxJS Observable-based API. This means that the multiple calls to the HTTP module will all return an observable, that we need to subscribe to one way or the other.
Let's now start using the HTTP module, and use it to perform a simple HTTP GET. Just as a demo, we will be querying a Firebase database using the built-in REST capabilities of Firebase, and displaying some data directly on the screen.
As we can see this data is a JSON structure, with no arrays. Everything is structured as a key-pair dictionary. Those funny looking strings are Firebase unique identifiers, they have some great properties (more about them in this post).
Notice in the call to get() that we are passing a generic parameter: we are specifying that the result of the get() call will be an Observable of Course[], meaning that this observable emits values which are arrays of courses.
The GET calls that we saw above can all be rewritten in a more generic API, that also supports the other PUT, POST, DELETE methods. For example, here is how we could write the same request using the request() API:
The PUT method should only be used if we want to fully replace the value of a resource. For example, we would use PUT if we want to overwrite a course object with a completely new version of that same course object:
Most often than not, instead of providing a completely new version of a resource, what we want to do is to just update a single property. And this is the main use case for the use of the HTTP PATCH method!
Another frequent operation that we want to do is to trigger a logical delete of some data. This operation can completely wipe the data from our database, or simply mark some data as deleted. This is an example of how we would delete a given course:
When we use the POST method to create data in the database, we usually want to return the unique identifier of the data that we just created, so that the client can reference that new resource if needed.
Depending on how you use the HTTP module, a problem that you might come across is the occurrence of multiple HTTP requests. This is actually the normal behavior of the HTTP observables, but it might be surprising the first time that we see it. 152ee80cbc
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