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Optical component
null corrector reports as the right prescription, it is critical that the null corrector be itself correct. An error in building the null corrector led
Null_corrector
NASA/ESA space telescope launched in 1990
refractive null correctors. However, for the final manufacturing step (figuring), they switched to the custom-built reflective null corrector, designed
Hubble_Space_Telescope
Cartographical (only) marker at 0°N, 0°E
Wikimedia Commons has media related to Null Island. Null Island is the location at zero degrees latitude and zero degrees longitude (0°N 0°E / 0°N 0°E
Null_Island
Specialized Cassegrain telescope
minimal additional equipment, typically a small optical device called a null corrector that makes the hyperbolic primary look spherical for the interferometric
Ritchey–Chrétien_telescope
Type of lens
testing is done for flat and spherical optical elements. The use of a null corrector in the test can remove the aspheric component of the surface and allow
Aspheric_lens
Optical arrangement with parallel rays
of a part of it. Large-aperture optics, however, are tested with a null corrector avoiding the production of a large plane mirror. One special application
Autocollimation
Position that there is no relationship between two phenomena
The null hypothesis (often denoted H 0 {\textstyle H_{0}} ) is the claim in scientific research that the effect being studied does not exist. The null hypothesis
Null_hypothesis
American corporation focused on life science research
schedule, producing significant friction with NASA. Due to a miscalibrated null corrector, the primary mirror was also found to have a significant spherical aberration
PerkinElmer
Value indicating that a referenced dataset is invalid or doesn't exist
In computing, a null pointer (sometimes shortened to nullptr or null) or null reference is a value indicating that the pointer or reference does not refer
Null_pointer
Optical test for curved mirrors
principle#Single slit diffraction Fabrication and testing of optical components Null corrector Strehl ratio Texereau 1984 pp.68-70 section 2.25 Harbour 2008 p 39 Texereau
Foucault_knife-edge_test
Control character with value 0
The null character is a control character with the value zero. Many character sets include a code point for a null character – including Unicode (Universal
Null_character
Astronomical telescope in Chile
wrong shape due to a mis-calibrated null corrector. However, the active optics system of the NTT was able to correct that error without refiguring the mirror
New_Technology_Telescope
Measurement method using interference of waves
spherical reference with the aid of a null corrector. Computer-generated holograms supplement null correctors in test setups for complex aspheric surfaces
Interferometry
Marker used in SQL databases to indicate a value does not exist
In the SQL database query language, null or NULL is a special marker used to indicate that a data value does not exist in the database. Introduced by the
Null_(SQL)
Vectors mapped to 0 by a linear map
In mathematics, the kernel of a linear map, also known as the null space or nullspace, is the part of the domain which is mapped to the zero vector of
Kernel_(linear_algebra)
Concepts from statistical hypothesis testing
of a true null hypothesis in statistical hypothesis testing. A type II error, or a false negative, is the incorrect acceptance of a false null hypothesis
Type_I_and_type_II_errors
Function of the observed sample results
that the null hypothesis is correct. A very small p-value means that such an extreme observed outcome would be very unlikely under the null hypothesis
P-value
Method of statistical inference
certain to be correct. There are two possible classes of error: A type I error, in which the null hypothesis is rejected despite the null hypothesis being
Statistical_hypothesis_test
Statistical technique used to correct for multiple comparisons
testing is based on rejecting the null hypothesis when the likelihood of the observed data would be low if the null hypothesis were true. When multiple
Bonferroni_correction
Computer fault caused by access to restricted memory
error in programs written in languages that support pointers that can be null, or that can be set to an arbitrary value, or that support arrays, and in
Segmentation_fault
Optical component testing facility in California
of the individual components. Unfortunately, due to a mis-assembled null corrector, one of the tests was wrong, and a mis-figured mirror was not discovered
Large Optical Test and Integration Site
Large_Optical_Test_and_Integration_Site
Statistical test comparing two probability distributions
distribution functions of two samples. The null distribution of this statistic is calculated under the null hypothesis that the sample is drawn from the
Kolmogorov–Smirnov_test
Class of language where a sentence subject is not required
In linguistic typology, a null-subject language is a language whose grammar permits an independent clause to lack an explicit subject; such a clause is
Null-subject_language
Statistical hypothesis test
Pearson proposed that, under the circumstance of the null hypothesis being correct, as n → ∞ the limiting distribution of the quantity given below
Chi-squared_test
Catadioptric reflector for search lights
save on mass since aberration can be corrected by the mirror, itself. Mangin mirrors are also used in null correctors, which are used to fabricate large
Mangin_mirror
Part of a network quietly losing traffic
Path MTU discovery to work correctly. This causes TCP connections from/to/through hosts with a lower MTU to hang. A null route or black hole route is
Black_hole_(networking)
Study of collection and analysis of data
statistical power of a test is the probability that it correctly rejects the null hypothesis when the null hypothesis is false. Referring to statistical significance
Statistics
Nucleosynthesis Nuclide Nuclotron Nuker Team Null corrector Null dust solution Null surface Nuller Nulling interferometry Number density Numerical model
Index_of_physics_articles_(N)
Topics referred to by the same term
definition Undefined citizenship, a post-Soviet form of statelessness in Estonia Null (disambiguation) Void (disambiguation) Invalid (disambiguation) Definition
Undefined
Machine instruction that indicates to a computer to do nothing
NOP or null statement if it has no effect. Null statements may be required by the syntax of some languages in certain contexts. In Ada, the null statement
NOP_(code)
Statistical method for handling multiple comparisons
discovery rate (FDR) is a method of conceptualizing the rate of type I errors in null hypothesis testing when conducting multiple comparisons. FDR-controlling
False_discovery_rate
Types of error in data reporting
result corresponds to rejecting the null hypothesis, and a negative result corresponds to not rejecting the null hypothesis. The terms are often used
False positives and false negatives
False_positives_and_false_negatives
Foucault knife-edge test, Ronchi test, Caustic test) Auxiliary optics (null correctors, computer-generated holograms, etc.) Interferometric testing The Fizeau
Optical manufacturing and testing
Optical_manufacturing_and_testing
German Television Game show
Null gewinnt (literally, "Zero wins") is the German adaptation of the BBC game show Pointless. Hosted by Dieter Nuhr and Ralph Caspers, it aired on Das
Null_gewinnt
Language in which certain pronouns may sometimes be omitted
"pronoun-dropping" is part of the larger topic of zero or null anaphora. The connection between pro-drop languages and null anaphora relates to the fact that a dropped
Pro-drop_language
General-purpose programming language
between nullable and non-nullable data types. All nullable objects must be declared with a "?" postfix after the type name. Operations on nullable objects
Kotlin
Concept in inferential statistics
\alpha } , is the probability of the study rejecting the null hypothesis, given that the null hypothesis is true; and the p-value of a result, p {\displaystyle
Statistical_significance
Famous randomized experiment
(1935). The experiment is the original exposition of Fisher's notion of a null hypothesis, which is "never proved or established, but is possibly disproved
Lady_tasting_tea
Sorting algorithm
(list == NULL || list->next == NULL) { return list; } // head is the first element of resulting sorted list struct LinkedList* head = NULL; while (list
Insertion_sort
Term in statistical hypothesis testing
hypotheses, the power of the test is the probability that the test correctly rejects the null hypothesis ( H 0 {\displaystyle H_{0}} ) when the alternative
Power_(statistics)
Set of rules defining correctly structured programs
working from left to right, or NULL if all the operands equal NULL. COALESCE(x1,x2) is equivalent to: CASE WHEN x1 IS NOT NULL THEN x1 ELSE x2 END The NULLIF
SQL_syntax
Human blood group system involving 49 blood antigens
Hasekura H, Boettcher B (1970). "Family study of the original Australian Rh-null". Proceedings of the Japan Academy. 46 (7): 733–737 – via J-STAGE. Bailey
Rh_blood_group_system
Family of protocols for solving consensus
| | Prepare(1) |<---------------X--X--X--X--X | | Promise(1,{null,null,null,null,null}) x--------------->| | | | | | | Accept!(1,V1) | | | | X------------------>|->|
Paxos_(computer_science)
Vector spaces associated to a matrix
left null space (the null space of AT) is the orthogonal complement to the column space of A. For a matrix A, the column space, row space, null space
Row_and_column_spaces
Nonparametric test of the null hypothesis
or Wilcoxon–Mann–Whitney test) is a nonparametric statistical test of the null hypothesis that randomly selected values X and Y from two populations have
Mann–Whitney_U_test
Statistical test
statistical test for which the distribution of the test statistic under the null hypothesis can be approximated by a normal distribution. Z-test tests the
Z-test
Statistical test for normality of data
Kolmogorov–Smirnov test. It is used to test the null hypothesis that data come from a normally distributed population, when the null hypothesis does not specify which
Lilliefors_test
Obligation on a party in a dispute to provide sufficient warrant for their position
with the null hypothesis, then the null hypothesis is not rejected. In neither case is the null hypothesis or its alternative proven; the null hypothesis
Burden_of_proof_(philosophy)
Exact statistical hypothesis test
counterfactual) null hypothesis is that all samples come from the same distribution H 0 : F = G {\displaystyle H_{0}:F=G} . Under the null hypothesis, the
Permutation_test
Flat-sided three-dimensional shape
Associahedron, a convex polytope in which each vertex corresponds to a way of correctly inserting opening and closing parentheses Dihedron, a polyhedron with
Polyhedron
In computing, a condition where an expression does not have a correct value
unpredictable value, or merely a program failure on attempt of its evaluation. Nullable types offer an intermediate approach; see below. The value of a partial
Undefined_value
Statistical methods for comparing samples
= p 1 = p 2 {\displaystyle p_{0}=p_{1}=p_{2}} is when assuming the null is correct. The MDE depends on the sample sizes, baseline proportions ( p 1 ,
Two-proportion_Z-test
Alternative assumption to the null hypothesis
the null hypothesis. The test of significance is designed to assess the strength of the evidence against the null hypothesis. Usually, the null hypothesis
Alternative_hypothesis
Pointer that does not point to a valid object
system is able to detect run-time references to null pointers, a solution to the above is to assign 0 (null) to dp immediately before the inner block is
Dangling_pointer
Digital circuit without clock cycles
work Logically determined design in 2005 which used four-valued logic with null and intermediate being the additional values. This architecture is important
Asynchronous_circuit
Data structure with nodes pointing to the next node
temp->next = NULL; // initialize invalid links to nil. if (!head) { head = temp; // If the linked list is empty (i.e., the head node pointer is a null pointer)
Linked_list
Radio station
change-of-frequency notice posted by state-owned Radio Taiwan International, the correct name is Xing Xing (星星). The unit number is usually a four digit number
Star Star Broadcasting Station
Star_Star_Broadcasting_Station
Version of the C# programming language
following code illustrates the corrected flaw: int? i = null; object o = i; if (o == null) System.Console.WriteLine("Correct behaviour - runtime version
C_Sharp_2.0
Observed inability to reproduce scientific studies
of incorrectly rejecting the null hypothesis is 5% (i.e. Type I error) and the probability of correctly rejecting the null hypothesis is 80% (i.e. Power)
Replication_crisis
Statistic used in statistical hypothesis testing
would distinguish the null from the alternative hypothesis, where such an alternative is prescribed, or that would characterize the null hypothesis if there
Test_statistic
Data-interchange format
555-4567" } ], "children": [ "Catherine", "Thomas", "Trevor" ], "spouse": null } Although Crockford originally asserted that JSON is a strict subset of
JSON
Linked list data structure
sets both firstNode and lastNode to null, and so it handles removing the last node from a one-element list correctly. Notice that we also don't need separate
Doubly_linked_list
Input which activates otherwise hidden functionality
project. Common issues that might lead to this anti-pattern as a result: Null != null or any variation where a data type doesn't compare bitwise to a supposedly
Magic_string
Statistical interpretation with many tests
multiple null hypotheses. Suppose we have a number m of null hypotheses, denoted by: H1, H2, ..., Hm. Using a statistical test, we reject the null hypothesis
Multiple_comparisons_problem
Continuous probability distribution
is a continuous probability distribution that arises frequently as the null distribution of a test statistic, most notably in the analysis of variance
F-distribution
Probability of making type I errors when performing multiple hypotheses tests
multiple null hypotheses. Suppose we have a number m of null hypotheses, denoted by: H1, H2, ..., Hm. Using a statistical test, we reject the null hypothesis
Family-wise_error_rate
Statistical hypothesis test
in which the test statistic follows a Student's t-distribution under the null hypothesis. It is most commonly applied when the test statistic would follow
Student's_t-test
Programming language for JSON
data types shown in the table below. null is a value, just like any other JSON scalar; it is not a pointer or a "null pointer". nan (corresponding to NaN)
Jq_(programming_language)
Mathematical model combining space and time
moving at the speed of light is zero. Such an interval is termed lightlike or null. A photon arriving in our eye from a distant star will not have aged, despite
Spacetime
giving Segway tours. Although she received the job, Todd considers the bet null because she used a motorized cart instead of a Segway. 82 15 "Boys to Men"
List of Chrisley Knows Best episodes
List_of_Chrisley_Knows_Best_episodes
1935 book by R.A. Fisher
replication, blocking, and contains Fisher’s influential discussion of the null hypothesis, illustrated in the context of the Lady tasting tea experiment
The_Design_of_Experiments
British computer scientist (1934–2026)
Hoare apologised for inventing the null reference: I call it my billion-dollar mistake. It was the invention of the null reference in 1965. At that time
Tony_Hoare
1989 video game
Amiga versions, with another player using two computers connected via a null modem cable, each with their own TV or monitor. Such direct head-to-head
Stunt_Car_Racer
Statistical method
it increases the p-value and thus reduces the likelihood of rejecting the null hypothesis when it is true. While widely taught in introductory statistics
Yates's correction for continuity
Yates's_correction_for_continuity
Object which stores memory addresses in a computer program
possible for code to attempt to dereference a null reference (null pointer), however, which throws a java.lang.NullPointerException. The space occupied by unreferenced
Pointer (computer programming)
Pointer_(computer_programming)
Statistical hypothesis testing measure
rejecting the null hypothesis for any result with an equal or smaller p-value, the q-value gives the expected pFDR obtained by rejecting the null hypothesis
Q-value_(statistics)
Pioneering five-bit character encodings
to the positions where they have stayed ever since: the NULL or BLANK and the DEL code. NULL/BLANK was used as an idle code for when no messages were
Baudot_code
Software design pattern
Correct but possibly expensive multithreaded version class Foo { private Helper helper; public synchronized Helper getHelper() { if (helper == null)
Double-checked_locking
Term in statistical hypothesis testing
"rejecting the null hypothesis when it is true". Type II error: "failing to reject the null hypothesis when it is false". Type III error: "correctly rejecting
Type_III_error
Scripting language created in 1994
true and zero as false, as in Perl and C++. The null data type represents a variable that has no value; NULL is the only allowed value for this data type
PHP
Geospatial vector data format
shape type, which must be either the shape type given in the file header or Null. The following are the possible shape types: The index contains positional
Shapefile
Computer program variable of undefined value
typically not the correct value. Initialized does not mean correct if the value is a default one. (However, default initialization to NULL (or nullptr since
Uninitialized_variable
would implement a listener interface: String key = null; String value = null; List<String> params = null; int column = 0; public void addToken(token) { //
Loop-switch_sequence
Open standard for programming heterogenous computing systems, such as CPUs or GPUs
clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU, NULL, NULL, NULL); // create a command queue clGetDeviceIDs(NULL, CL_DEVICE_TYPE_DEFAULT, 1, devices, NULL); cl_command_queue
OpenCL
Lacking or omission of a "to be" verb, common in some languages and stylistic in others
Zero copula, also known as null copula, is a linguistic phenomenon whereby the subject is joined to the predicate without overt marking of this relationship
Zero_copula
Letter in several Latin-script alphabets
the open-mid back unrounded vowel [ʌ]. Ø (or more properly, the similar null sign, ∅), is used in English as a short for "no" or "none", but this usage
Ø
Coordinates to capture characteristics of rotating frames of reference
will pretend that the world line of our laser pulse is a null curve (but certainly not a null geodesic!). In the Born line element, let us put d s = d
Born_coordinates
General-purpose programming language
types support aliasing integer values Lacks a string type but has syntax for null-terminated strings with associated handling in its standard library Supports
C_(programming_language)
ASCII-compatible variable-width encoding of Unicode
the null character U+0000 uses the two-byte overlong encoding 0xC0 0x80 instead of just 0x00. Modified UTF-8 strings never contain any actual null bytes
UTF-8
Structure in data warehousing
second row is equal to the End date/time (or next) of the previous row. The null End_Date in row two indicates the current tuple version. A standardized surrogate
Slowly_changing_dimension
Twenty-first letter in the Greek alphabet
section; for example, "⌀14" means the diameter of the circle is 14 units. The null sign, ∅, which denotes the empty set in mathematics is sometimes also erroneously
Phi
Shade of the color gray
detailed description see K.S. Gibson, Photoelectric spectrophotometry using the null method. Priest, Irwin G.; Gibson, K.S.; McNicholas, H.J. (September 1920)
Middle_gray
Formula for number of orbits of a group action
including the null rotation, and the number of bit strings left unchanged by each rotation. All eight vectors are unchanged by the null rotation, and
Burnside's_lemma
Statistical test used on paired nominal data
tabulates the outcomes of two tests on a sample of N subjects, as follows. The null hypothesis of marginal homogeneity states that the two marginal probabilities
McNemar's_test
Control system for the motion of a mechanical system
a constant value of the output with null error signal. A constant rate of change of the reference implies a null error in tracking the reference. A constant
Servomechanism
English nobleman (1794–1848)
their correct names but without revealing their identities. Both marriages were in defiance of the Royal Marriages Act 1772 and were thus legally null and
Augustus_d'Este
JavaScript syntax extension
createElement("div", null, React.createElement("p", null, "Header"), React.createElement("p", null, "Content"), React.createElement("p", null, "Footer")); };
JavaScript_XML
Digital video format used for storage network transmission
some additional packets. The PID 0x1FFF is reserved for this purpose. The null packets have a payload that is filled with 0xFF, and the receiver is expected
MPEG_transport_stream
Relational database programming language
follow standards. In particular, date and time syntax, string concatenation, NULLs, and comparison case sensitivity vary from vendor to vendor. PostgreSQL
SQL
Statistical tool to assess investments
{\displaystyle SR_{0}} is the **expected maximum Sharpe Ratio** under the null hypothesis of no skill, H 0 : S R = S R 0 {\displaystyle H_{0}:SR=SR_{0}}
Deflated_Sharpe_ratio
NULL CORRECTOR
NULL CORRECTOR
Male
English
Medieval pet form of English Oliver, probably NOLL means "elf army."
Boy/Male
British, English, Spanish
Strong Leader; Empty
Surname or Lastname
English
English : nickname for a strong, aggressive, bull-like man, from Middle English bul(l)e, bol(l)e. Occasionally, the name may denote a keeper of a bull. Compare Bulman.German (mainly northern) : from a byname for a cattle breeder, keeper, or dealer. Compare South German Ochs.South German : nickname for a short fat man, a variant of Bolle, or a nickname for a man with the physical characteristics of a bull.
Male
Hungarian
Hungarian form of Greek Emmanouel, EMÃNUEL means "God is with us."
Surname or Lastname
English
English : from an Old English personal name, Lulla.German (Lüll) : from a short form of any of the Germanic personal names formed with liut- ‘people’ as the first element.Catalan (also Llull) : from the personal name Lullus, probably of Germanic origin.
Girl/Female
American, Australian, British, Danish, English, French, German, Greek, Irish, Swedish
Shining Light; Light; The Light of the Sun from Eleanor and Variation of Helen; Sun Ray; Stone; Champion; Horn; Torch; Moon; Moon Elope
Girl/Female
Arabic
Arabian Jasmine
Surname or Lastname
English
English : of uncertain origin, possibly from an unrecorded late survival of the Old English personal name Tula.South German (Tüll) : from a nickname for someone who was patient, from Middle High German dult ‘patience’; or from a personal name formed with the same word; or from Middle High German tult, dult ‘fair’, ‘festival’ (Bavarian Dult).South German : nickname for a stubborn man, Tull.Altered spelling of German Toll.
Surname or Lastname
Dutch and German
Dutch and German : from the personal name Nel, a reduced form of Cornelius.South German : nickname from Middle High German nelle ‘crown of the head’, perhaps denoting an obstinate person.English : from the Middle English personal name Nel(le), a variant of Neill.
Boy/Male
Celtic
Champion.
Girl/Female
Afghan, Australian, Danish, Swedish
God
Boy/Male
Hindu
Battle maiden
Female
English
Pet form of English Eleanor, NELL means "foreign; the other."
Surname or Lastname
English
English : nickname from Middle English gulle ‘gull’ or gul(le) (Old Norse gulr) ‘yellow’, ‘pale’ (of hair or complexion).Swiss German : nickname for an irascible or unreliable person, from an Alemannic form of Latin gallus ‘rooster’. See also Guell.
Boy/Male
British, English
Grinder
Surname or Lastname
English
English : variant of Hill 1.English : from a pet form of Hugh.
Surname or Lastname
English
English : unexplained.Possibly a shortened form of any of several German compound surnames formed with Full- or Füll-.
Girl/Female
Greek American English French
Shining light. The bright one.
Boy/Male
Shakespearean
Love's Labours Lost' A constable.
Surname or Lastname
English
English : from the Old English personal name Cula.Americanized spelling of German and Swedish Kall or German Koll.
NULL CORRECTOR
NULL CORRECTOR
Male
English
Anglicized form of Hebrew Yowachaz, JOAHAZ means "Jehovah as seized" or "whom Jehovah holds fast." In the bible, this is the name of the father of Joah, Josiah's chronicler.Â
Girl/Female
Muslim
Leader, Head, Chief
Male
Chinese
golden sea.
Girl/Female
Indian
Respecting
Boy/Male
Hindu
Lord Shiva, The cosmic serpent Shesh
Girl/Female
Australian, Indonesian
Image
Boy/Male
Biblical
Heard; he obeys.
Girl/Female
Indian
Born in Spring, Beautiful, Happy
Girl/Female
Hindu, Indian, Tamil
Pomegranate Blossom
Boy/Male
Hindu, Indian, Tamil
King of Kings
NULL CORRECTOR
NULL CORRECTOR
NULL CORRECTOR
NULL CORRECTOR
NULL CORRECTOR
superl.
Not bright or clear to the eye; wanting in liveliness of color or luster; not vivid; obscure; dim; as, a dull fire or lamp; a dull red or yellow; a dull mirror.
Compar.
Not wanting in any essential quality; complete, entire; perfect; adequate; as, a full narrative; a person of full age; a full stop; a full face; the full moon.
a.
Full to the brim; quite full; chock-full.
a.
Of or pertaining to a bull; resembling a bull; male; large; fierce.
a.
No; not any; as, nul disseizin; nul tort.
a.
Quite full; choke-full.
superl.
Furnishing little delight, spirit, or variety; uninteresting; tedious; cheerless; gloomy; melancholy; depressing; as, a dull story or sermon; a dull occupation or period; hence, cloudy; overcast; as, a dull day.
v. t.
To strip off or separate the hull or hulls of; to free from integument; as, to hull corn.
v. i.
To become dull or stupid.
v. t.
To gather with the hand, or by drawing toward one; to pluck; as, to pull fruit; to pull flax; to pull a finch.
n.
A cully; a dupe; a gull. See Cully.
v. t.
To dispirit or deaden; to dull or blunt.
Compar.
Abundantly furnished or provided; sufficient in. quantity, quality, or degree; copious; plenteous; ample; adequate; as, a full meal; a full supply; a full voice; a full compensation; a house full of furniture.
n.
A contest; a struggle; as, a wrestling pull.
n.
A knob, handle, or lever, etc., by which anything is pulled; as, a drawer pull; a bell pull.
v. t.
To move or operate by the motion of drawing towards one; as, to pull a bell; to pull an oar.
v. t.
To endeavor to raise the market price of; as, to bull railroad bonds; to bull stocks; to bull Lake Shore; to endeavor to raise prices in; as, to bull the market. See 1st Bull, n., 4.
n.
A promontory; as, the Mull of Cantyre.
n.
The act of rowing; as, a pull on the river.
v. t.
To heat, sweeten, and enrich with spices; as, to mull wine.